Printing form production method, apparatus for producing printing forms for screen printing and apparatus for screen printing

FIELD: processes and equipment for making printing forms for screen printing, apparatuses for screen printing.

SUBSTANCE: method for making printing forms comprises steps of melting heat sensitive material of printing forms for screen printing having film of thermosetting resin of predetermined thickness by heating thermal head for perforating holes permeable for printing ink; forming large number of shallow recesses in one side of said film. Heaters of thermal head 10 have such size that next inequalities HM > 0.6PM, HS > 0.7 PS are satisfied. Heaters are arranged at pitch PM in side of main scanning direction. Length of heaters along side of main scanning direction is equal to HM. Feed stroke at side along secondary direction of scanning is equal to PS. Length of heaters at side along secondary direction of scanning is equal to HS. Side of film opposite to its side having shallow recesses is heated due to heating thermal head 10 with output 35 mJ/mm2 or less for melting heated zone until its communication with said recesses in order to form holes permeable for printing ink.

EFFECT: possibility for thermally perforating in film individual holes permeable for typographic ink at the same output of thermal head, realization of screen printing process at using material of printing forms for screen printing containing only film of thermoplastic resin.

18 cl, 9 dwg

 

The technical field to which the invention relates.

The present invention relates to the manufacture thermomechanic forms for screen printing, in particular to the method of making printing plates and device for the manufacture of printed forms for screen printing and device for screen printing, which implement the production of printing forms by using the material of printed forms for screen printing, essentially consisting only of a film of thermoplastic resin without permeable to ink bases such basis as Japanese paper, nonwoven fabric, etc. Besides the above-mentioned expression "consisting essentially only of a film of thermoplastic resin" should be considered as encompassing such a structure film on the surface which can be applied conductive coating and the coating to prevent the welding, provided that it has no basis, is permeable to ink.

Prior art

Typically the stencil, which is used as a printing plate for screen printing, in the General case contains permeable to the ink base and a film of thermoplastic resin, which is bonded to the substrate using adhesives. Permeable to the ink base is made from Japanese paper or natcan the first material, etc. The film is a thermoplastic resin made of a complex of the polyester and the like, the film Thickness of thermoplastic resin is 1.5 μm, and usually corresponds to the thickness of approximately 30-40 μm. Printing is carried out by removal of printing ink from the printing plate for screen printing, which is formed mainly by thermal perforation of the film. Mentioned thermal perforation is carried out mainly by heating thermal head, namely, insert the said stencil between thermal print head and the platen, and then heated using a thermal head.

In connection with screen printing, by using such a stencil made or engraved above way, in the technical literature on the basis of previous experience is mentioned about the various inconveniences or disadvantages of using the printing plate for screen printing, which with the help of adhesives bonded film of thermoplastic resin. Meanwhile, different proposals for improvements consisting in the use of printed forms for screen printing, consisting only of the film of thermoplastic resin without the basics. However, none of these proposals is currently not implemented, and any new proposals should lead to the elimination of certain t is hanicheskih problems. In particular, when the printing plate for screen printing consists only of a film of thermoplastic resin, with this printed form for screen printing, it is difficult to work if the film thickness is not large enough. In addition, it is necessary to increase the output force of thermal head in order to carry out thermal perforation on the thick film. This created various problems and has caused the greatest difficulty in use.

On the other hand, the perforation holes of the printed forms for screen printing performed for screen printing, it is preferable to perform independently for each point, and for this purpose it is desirable to make the size of the heaters corresponding to the step between the points as little as possible, as shown in Japanese patent publication No. 2732532. However, reducing the size of the heater to a small value increases the influence of the scattering of heat that the heater receives from the district electrodes, resulting in thermal efficiency of thermal head decreases, and the service life of thermal head becomes short. Moreover, in connection with thermal head of the type which is needed for a thin film, it should be noted that, since the exothermic part is recessed in comparison with the surrounding electrode, the stencil will be maintained high for what astami electrode, arranged around the recessed portion, in accordance with the reduction in the size of the heater. Therefore, the contact condition or state of adhesion between the exothermic part and the stencil becomes unsatisfactory, and thermal efficiency drops even more.

In addition, in order to solve the above problem of deterioration of the contact between the exothermic part and the stencil by reducing the size of the heater, the proposed thermal head of the so-called "partial surface, which through surface lifts only exothermic part.

However, even if thermal head is the head of the partial surface, because the rise in partial glassing is very smooth, curve lift also becomes approximately a straight line. In view of this complete solution to the problem of adhesion becomes impossible.

The invention

As mentioned above, the problem stencil for screen printing and the problem of thermal heads for screen printing, respectively, are independent. The basis of the present invention set the idea, namely, that these problems need to be solved simultaneously. Therefore, in the present invention, a method and device for the manufacture of printed forms and machine for screen printing, which Rea is isout screen printing, when the stencil (printing plate for screen printing) consists only of a film of thermoplastic resin.

Resolving problems

First of all, the method of making printing plates for screen printing in accordance with the present invention solves the technical problems inherent in the known technical solutions, and to achieve this goal it consists in the following. Namely, the method of making printing plates for screen printing in accordance with the present invention involves the formation is permeable to ink holes by thermal melting heat-sensitive material of the printing plate for screen printing, designed for screen printing and consisting of a stretched film of a thermoplastic resin having a predetermined thickness, and is characterized by the fact that they are within the above-mentioned film mechanical strength characteristic of the time of stretching, and is formed on one side surface of the above-mentioned film a lot of small grooves, and the surface opposite to the one where there are small indentations, is heated using a thermal head, thus, produced to heat the energy of thermal head is sufficient for melting through the thin covering of a shallow excavation, but is limited to di is a scoring range, which does not allow penetration through thick parts with the exception of the recessed part of the film, so that the said openings are formed is heated molten part, communicating with small notch.

In the main scanning direction in one sequence or layer on thermal head are two or more heaters. When the spacing of the heaters on the side along the main scanning direction, is set equal to the RM, the length of the heater-side along the main scanning direction, is set equal to NM, pitch-side, running along the secondary scanning direction, is set to PS, and the length of the heaters on the side, along the secondary scanning direction, is set equal to HS, it is desirable that the size of the heaters to satisfy the inequalities NM>0,6PM and HS>0,7PS.

It is desirable that the energy of thermal head during printing during manufacture of the printing plate was below 35 millijoules per square millimeter (MJ/mm2).

In addition, the implementation of the method of manufacturing a printed material forms printed forms for screen printing consists of a stretched film, which is retained tensile stress characteristic of the time of extension. Therefore, when the heated portion WA is no melt, the basis rasplavljaetsja part communicates with a shallow notch, so that by the continued mechanical stresses formed hole punching, permeable to ink.

Further, when implementing this method, screen printing, it is desirable that the material of printed forms for screen printing consisted of a stretched film of polyethylene terephthalate (PET) or a stretched film with a low melting point, obtained by copolymerization and polyethylene terephthalate (PET), polybutylene terephthalate (pbtf was honored with), and when the set temperature is equal to t°when you ask the melting point of the film, is m°and when asked by the glass transition temperature equal to g°S, it is preferable that the printing stencil (receipt of print) was carried out with the application efforts, due to work pressure, denoted P, expressed in Pascals and equal to 104·102(m-t)/(m-g)or more.

Small notch may be penetrating hole, where the hole diameter on the heated side of the film is smaller than the diameter of the hole on the side which is opposite to the hot side, but the hole diameter on the heated side of the low, to prevent the penetration of ink.

In addition, the small notch can be depression, which is part of the but reduces the thickness of the film and forms a thin covering part.

Next, a device for the manufacture of printed forms for screen printing according to the present invention includes the following elements. Namely, this device contains a section of the supply of printed forms, which delivers the heat sensitive printing plates for screen printing, comprising a stretched film of a thermoplastic resin having a predetermined thickness, means for forming many small grooves on the one side surface of the film and the heating means for forming permeable to ink holes by heating the film, and the surface opposite to having a small seizure side of the film, is heated by a heating means, mechanical voltage characteristic at the time of extension, is kept inside a film of thermoplastic resin, produced to heat energy of the heating means sufficient for penetration through the thin covering of a shallow excavation, it is limited to a range that does not allow penetration through the thickest part, except for the recessed portion of the film, so that holes are formed in the heated molten part, communicating with small notch.

This heating means is a thermal head, which in the main scanning direction in one sequence, Jerusa are two or more heaters, moreover, when the spacing of the heaters on the side along the main scanning direction, is set equal to the RM, the length of the heater-side along the main scanning direction, is set equal to NM, pitch-side, running along the secondary scanning direction, is set to PS, and the length of the heaters on the side, along the secondary scanning direction, is set equal to HS, it is desirable that the size of the heaters to satisfy the inequalities NM>0,6PM and HS>0,7PS, and generated energy of thermal head was below 35 MJ/mm2.

Of course, you can build a machine for screen printing, equipped with the above-mentioned device for the manufacture of printed forms for screen printing as a partition plate processing.

In addition, in any case, the device for the manufacture of printed forms and machines for screen printing small notch can be made in the form of penetrating holes whose hole diameter on the heated side of the film is smaller than the diameter of the hole on the side which is opposite to the hot side, but the hole diameter on the heated side is small enough to prevent penetration of printing ink.

The effects achieved with the present invention and lead to its excellent contrast ratio, the STV over the known technical solutions

The present invention provides the possibility of thermal perforation permeable to ink the individual holes in the film independently and without increasing the energy output of thermal head, and also sells screen printing by use of the material printed forms for screen printing, consisting only of a film of thermoplastic resin. Therefore, the problem of pattern material printed forms for screen printing) and the problem of thermal heads are solved simultaneously.

Brief description of drawings

Figure 1 illustrates the concept of a method and device for the manufacture of printed forms in accordance with the present invention.

Figure 2 is a front view of the condition of the matrix section of the heaters of thermal head.

Figure 3 - the state of the printing plate for screen printing, profile with giving the heater position "1" in accordance with the heat production according to the method of manufacture of printed forms, with the above-mentioned process is carried out through the implementation of the method of making printing plates in accordance with the present invention.

Figure 4 - concept of the structure of the stencil used for implementing the method and device for the manufacture of printed forms in accordance with the present invention.

Figure 5 - concept structure is ture stencil used for implementing the method and device for the manufacture of printed forms in accordance with the present invention.

Figure 6 is an example of sets of means for forming small grooves in the stencil.

7 is another example of a set of technical means for forming small grooves in the stencil.

On Fig is another example of sets of means for forming small grooves in the stencil.

Figure 9 - the following example sets of means for forming small grooves in the stencil.

The best option of carrying out the invention

Now, with reference to figures 1 to 9, will describe the method and device for the manufacture of printed forms for screen printing and machines for screen printing in accordance with the present invention. Figure 1 shows the method of making printing plates in accordance with the present invention. In figure 1 the reference number 10 denotes a thermal head, and reference number 11 denotes a printing roller. The stencil 12, consisting of a stretched film of polyethylene terephthalate (PET), moves from left to right in the direction of the arrow shown in figure 1. Although figure 1 shows a section on an enlarged scale, the actual size of each technical means is as follows: the thickness of the stencil 12 is on adca a few micrometers, and the length of the section 13 of the heaters of thermal head 10 is approximately 10 μm to 20 μm and several μm in the direction of feed of the stencil. In addition, although the printing roller 11 shown in figure 1 only partially, it is a rubber roller that has a diameter of about 20 mm

In addition, as the above film can be used and another thermoplastic resin, for example, polyethylene terephthalate resin, polyethylene resin, polyvinyl chloride resin, polyvinylidenechloride resin, polymethylpentene resin, polypropylene resin, polietilentereftalatnoy resin, polymer, isopropyl alcohol, nylon 6. In particular, when using a complex film of polyester, it is preferable to use the above-mentioned polyethylene terephthalate (PET) film, polyethylene terephthalate (PET) film with a degree of crystallinity of 20% or less, the stretched film with a low melting point, obtained by copolymerization of polyethylene terephthalate (PET) and polybutylene terephthalate (pbtf was honored with), or a film with a low melting point, obtained by copolymerization of polyethylene terephthalate (PET) with the degree of crystallinity of 20% or less, and polybutylene (PB).

On one side surface of the stencil 12 is made much smaller or microsiemen 14, the arrangement of which is random. KJV is Anuta lateral side is in contact with the printing roller 11. Figure 1 shows a state in which thermal head 10 power, so that part of the stencil 12, which is in contact with section 13 of the heaters, is perforated. The threading of the stencil 12 is carried out by melting the bottom of the shallow recess 14, as a result, formed is permeable to ink hole. Thus, permeable to ink hole can be formed in the desired parts for the manufacture of printed forms, making it by controlling the power supply to the section 13 of the heaters of thermal head 10 by connecting or disconnecting the power supply.

Therefore, because of the small recesses 14 are formed on one side surface of the film of the stencil 12, when the stencil 12 is heated and perforined with its opposite side, it becomes possible formation of holes, permeable to ink, by penetration through only the lower part of the recess 14 without threading the entire film thickness.

The density of formation of the shallow grooves 14 can be changed in accordance with the desired resolution. In connection with the density of the grooves 14, it is desirable that the ratio disclosure was 5-30% on point, which provides an excellent seal while preventing reverse the swelling and transillumination image on the reverse side does not print. That is, the area of the film which is in contact with the one part 13 of the heaters of thermal head 10, is equivalent to one point of the matrix, and in this area must be at least one shallow recess 14.

In addition, although the matrix of small grooves 14 may be arranged, preferably, this matrix was disordered in fixed limits corresponding to the desired ratio disclosure in order to prevent the phenomenon of "moire". The phenomenon of "moire" means that the profile strips on the printed sheet appears shade of ink. In the case of such phenomenon, the average step small grooves 14 is set smaller than the array pitch of section 13 of the heaters of thermal head 10.

Figure 2 presents a view in plan, showing the condition of the matrix section of the heaters of thermal head. Two or more heaters located in the main scan direction in one layer, and the spacing of the heaters on the side along the main scanning direction, is RM, the length of the heater-side along the main scanning direction, is NM, the pitch-side, running along the secondary scanning direction, is PS, and the length of the heaters on the side, along the secondary scanning direction, is HS. In atomlike the length of the heaters on the side walking along the main scanning direction exceeds 0.6 spacing of the heaters on the side along the main scanning direction, and the length of the heaters on the side, along the secondary scanning direction exceeds 0.7 spacing of the heaters on the side, along the secondary scanning direction. Even if the size of the heaters becomes so large hole perforations should not be large in this regard. The reason is that the production of printing forms is carried out with the use of the stencil material containing only film of thermoplastic resin, which has many small grooves on one of its lateral surface, and the energy generated by thermal head for heating, is sufficient for melting through the thin covering of a shallow excavation, but is limited to a range that does not allow penetration through the thickest part, except for the recessed part of the film. If the hole perforation, the size of the heater is formed in a conventional stencil on a conventional machine for making printing plates, the diameter of the perforation holes becomes large due to the increasing size of the heater and, ultimately, the hole punching mill is broken by communicating with the next hole perforation. In such cases, even if the printed character "0", this symbol may be spread out and take the form of.

During the manufacture of printing forms produced by the energy of thermal head is less than 35 MJ/mm2. Above the perforation holes completely independent, because they are formed with the use of fill. Figure 3 shows the state of the printing plate for screen printing, profile by giving the heater position "1" in accordance with the heat production according to the method of manufacture of printed forms. Some of the perforation holes, which are perforated by heating thermal head, are blurred in the black spots. Thus, since each hole perforations can be formed independently from each other, without making the size of the heaters are small, we can assume that the heater is large when sufficient thermal efficiency, and is less affected by heat dissipation. If you can further increase the size of the heaters, it is possible to improve the nature of the contact between the film and the heater, fully taking advantage of the effect of lift provided by a heater (heating element) for the partial surface, and thermal efficiency will be even higher. In particular, since the size of the heater is in the secondary scanning direction is increased, the advantage of improving the nature of the contact due to lift) using the partial surface becomes significant.

4 shows the image in the square in section, illustrating the stencil 12, in which a small notch is a penetrating hole, but this hole is small enough to prevent penetration of printing ink. Although the hole 21 on the surface 20, which is heated during the manufacture of printed forms, is small enough to prevent penetration of printing ink, the hole 23 on the surface 22 of the opposite side may be longer mentioned and may be large enough ink could get into the small cavity 14. In addition, figure 5 shows the situation in which a shallow recess 14 is formed, giving it the shape of a hollow with a thin bottom 24.

In addition, when a shallow recess 14 is formed, giving it the form of depression, it is preferable that the thickness of the thin bottom 24 was approximately 80% or less of the film thickness, but referred to the nominal thickness depends on the material of the film. In addition, during the stretching of the film may occur residual stress, and stress may be concentrated in the shallow groove surface, causing the resistance to disclosure, and in this case it is on istenem in the recess, the depth of which is 20% of the film thickness. On the other hand, when the stretching of the film occurs low residual stress, it is necessary to make the depth of the notches higher (by reducing the thickness of the thin bottom), and in this case, it is preferable that the thickness of the thin bottom was approximately 2 microns or less.

To search for the proper size heater thermal head and finding the corresponding energy of thermal head that are required for the manufacture of printed forms, conducted the following experiments. The used film was stretched film with a low melting point and is obtained by copolymerization of PET and pbtf was honored with reaching a thickness of 6 μm. Conducted photoetching to a depth of 18 μm in the surface of the plate stainless steel with a thickness of 0.2 mm, resulting received this stencil material, which has many small round protrusions having a diameter of 40 μm and a height of 18 μm, arranged with a pitch of 30 μm from each other. Each of the above-mentioned film laid on said screen material and passed between a pair Utagawa rollers with a diameter of 100 mm and a length of 200 mm Operating temperature was set equal to 25°and the working pressure between the rollers was set equal to 200 million Pascals (2t/mm2). In the experiments used the following term is ical head.

The parameters of thermal head: 400 dots per inch refers to the type of head for the partial surface, the size of the heaters in the main scanning direction is 30 μm, and the size of the heaters in the secondary scanning direction is 40 μm. The parameters of thermal head: 400 dots per inch refers to the type of head for the partial surface, the size of the heaters in the main scanning direction is 30 μm, and the size of the heaters in the secondary scanning direction is 80 μm. The parameters of thermal head With: 400 dots per inch refers to the type of head for the partial surface, the size of the heaters in the main scanning direction is 47 μm, and the size of the heaters in the secondary scanning direction is 80 μm. The parameters of thermal head D: 400 points per inch, refers to the type of head for the partial surface, the size of the heaters in the main scanning direction is 47 μm, and the size of the heaters in the secondary scanning direction is 100 μm. Tests platemaking was performed in accordance with such conditions that the repetition period of the line was set equal to 2 milliseconds (MS), pulse width of printing was set to 500 microseconds (μs), and its energy was set equal 10-35 MJ/mm2. the results of the experiments are shown in table 1. In this case, the term "energy generation" means energy consumed for 1 radiation pulse at 1 mm2heater thermal head. When the applied voltage is set to V (volts), electrical resistivity of the heater is set to R (Ω), the length of the heater-side along the main scanning direction, is set equal to NM (mm), the length of the heater-side along a secondary scanning direction, is set equal to HS (mm), pulse width is set equal to T (sec), and the energy of 1 mm2set equal to E (joules), the energy E in joules is expressed by the formula E=T(V2/R)/(HM·HS).

Table 1
Energy platemakingJudgmentThe situation in the manufacture of printing forms
Thermal head (HM=0,47) (HS=0,62)15 MJ/mm2XThe absence of perforation
20 MJ/mm2XThe absence of perforation
36 MJ/mm2Partial perforation, some hole punch is the outside grooves
Thermal head (HM=0,47) (HS=1,26)15 MJ/mm2XThe absence of perforation
20 MJ/mm2Minor perforation, and some of the perforation holes are located outside the grooves (5% cut-outs printable area)
36 MJ/mm2XThere are several holes perforation and out of the grooves, and the perforation holes become holes excessive amount of due to the connections with each other
Thermal head (HM=0,74) (HS=1,26)15 MJ/mm2OObvious perforation only in the grooves (20% cut-outs printable area)
20 MJ/mm2Obvious perforation only in the grooves (60% cut-outs printable area)
36 MJ/mm2There are several holes perforation and out of the grooves, and the perforation holes are holes excessive amount of due to the connections with each other
Thermal head D (HM=0,74) (HS=1,57)15 MJ/mm2The obvious item is Horace only in the grooves (70% cut-outs printable area)
20 MJ/mm2OThere are a number of penetration and outside grooves, holes, perforations become small holes excessive size due to partial connection with each other
36 MJ/mm2XThere are a number of penetration and outside grooves, holes, perforations in a very large number of become holes with excessive dimensions

When specifying the above estimates, the symbol X, the symbolthe symbol O and ⓪ given on the basis of each state after the manufacture of printed forms.

The symbol X means the implicit perforation. Namely, after platemaking any perforation hole, obtained by heating of thermal head, can not prevent the penetration of ink.

The symbolmeans that the perforation holes, obtained by heating of thermal head, can prevent the penetration of ink, but the number of perforation holes is insufficient.

The symbol O means that some of the perforation holes, obtained by heating of thermal head, were explicit and the number of holes of the perforation after the manufacture of printed forms which was sufficient.

The symbol ⓪ explicit means that the perforation. Namely, after the manufacture of printed forms perforation hole, obtained by heating of thermal head were clear and allowed the penetration of ink.

Above the symbol O means that some of the perforation holes arose partly out of the grooves due to the surplus of energy, and some of them are connected with each other. Namely, it should be considered excessive perforation.

The above symbolalso means that some of the holes of the perforation occurred largely outside the grooves due to the surplus of energy, and some of them are connected with each other. Namely, it should be considered excessive perforation.

Above the symbol X also means that some of the holes of the perforation occurred largely outside the grooves due to the excess energy, and they are all connected with each other. Namely, it should be considered excessive perforation.

When the spacing of the heaters on the side along the main scanning direction, is set equal to the RM, the length of the heater-side along the main scanning direction, is set equal to NM, pitch-side, running along the secondary scanning direction, is set to PS, and the length of the heaters on the side, running along the WTO is Stepanovo scanning direction, set to HS, it becomes clear that the production of printing forms by means of thermal heads C and D satisfying the conditions of formulas "NM>0,6PM and HS>0,7PS" on the heater, give an excellent result in comparison with the manufacture of printing forms by means of thermal heads a and b do not satisfy the above conditions formulas. Moreover, when the energy consumed in the manufacture of printing forms is greater than 30 MJ/mm2the whole film is melted down completely, resulting in the production of printed forms the image becomes indistinguishable.

Below is a description of the method of forming fine grooves 14 on the stencil 12, which consists of a film of thermoplastic resin. The printing stencil on the film or the embossed film is carried out by introducing protrusions on one side surface of the film. For example, to penetrate the film of thermoplastic resin to a predetermined depth, you can also use "sourceopen" means, on which is pasted a lot of the diamond particles. Generally speaking, it is difficult to implement the ledge in the thin plenkoobrazovatel sheet for forming penetrating holes. In this case, usually on the opposite side, where implementing the ledge (namely where there is a cavity with a thin bottom), layer remains in the form of peel, or the protrusion is embedded only in the extent how smoothly a hole around the crack (small hole, which is such that it does not allow the penetration of the ink through it). If the treatment is carried out using this property, suitable small notch can be formed on the treated side. Therefore, even if a small notch reaches the surface of the opposite side, the hole will not be such as to prevent the penetration of ink through it.

Figure 6 and 7 illustrates an implementation option of forming fine grooves 14. Stencil rollers 32, 33 and the supporting rollers 35, 36 are arranged so that they rotate in mutually opposite directions, while the surface of the stencil rollers 32, 33 are uneven surfaces, which are glued to the set of particles, and the surface of the supporting rollers 35, 36 are smooth surfaces. The film 12 of thermoplastic resin with a fixed thickness is introduced between the rollers 32 and 35 or between the rollers 33 and 36, which in both cases revolve. Small grooves 14 are formed on the side surface of the film of thermoplastic resin which is in contact with the stencil rollers 32 or 33 when printing stencil and the shape of each recess is the same as the shape of each particle.

As shown in Fig.7, when the notches are formed cores is to maintain the platen 33, which glue particles 31 having a relatively rounded edges, minor groove 14 does not reach even the opposite side of the film. On the other hand, as shown in Fig.6, when the notches 14 are formed stencil roller 32, which is affixed particles 30 having relatively sharp edges, small notch 14 can reach the opposite side of the film. However, in this case, the recess 14 does not become large enough to make a hole that is permeable to ink.

Next, Fig and 9 illustrated variant form of shallow grooves 14 on the film sheet complex polyester. On Fig shows a pair of rollers 130 and 131 arranged so that they rotate in mutually opposite directions. One roller 131 is used as a stencil roller, while at the perimeter of the peripheral surface of the roller 131 is formed of small ledges. Another roller 130 is a support roller with a smooth peripheral surface. The printing stencil is carried out by introducing a film 12 of thermoplastic resin with a fixed thickness between the screen roller 131 and the support roller 130, which rotate in the directions indicated by the arrows. Working conditions will comply with the above conditions.

Figure 9 shows the concept of alternative is the procedure and device for the production of printed material forms for screen printing. Metal belt 134 which between the rollers 135 and 136, has small protrusions 133 on the perimeter of the peripheral surface. In addition, provides the reference roller 137, which has a smooth peripheral surface 135. Processing in the form of a printing stencil is carried out by introducing a film 12 of thermoplastic resin with a fixed thickness between the metal belt 134 and the reference roller 137. Working conditions will comply with the above conditions.

Below is a description of one example of forming fine protrusions 132 on the shaft 131, shown in Fig. After the coating of ceramics in the flame of a plasma jet on the front surface (peripheral surface) of the metal material of the roller that the front surface can shrublet, and it is possible to form many small protrusions 132 by means of laser engraving. Step small protrusions 132 is preferably 100 μm or less, in a more preferred embodiment of the invention is 30 μm or less. The depth of laser engraving set equal 3-40 μm, while on the platen 131 form small ledges 132, the height of which is from 70% to 200% of the film thickness, resulting in the roller 131 is stencil roller.

The first advantage of using the cushion as a stencil body bookmark is included, that is easily achieved by hardening the surface compared with the case where as a stencil body uses the belt. In other words, the use of the belt is covered with ceramics, is difficult due to a lack of flexibility, however, in the case of cushion and flexibility is not required. The second advantage of using the cushion as a stencil body is that simplified infinite precision processing. And endless technological welding on the belt, carried out in order to continue the pattern on the surface micromachining, is difficult.

Below is a description of one example of forming fine protrusions 133 on the shaft 134, is shown in Fig.9. By photoetching, you can generate a lot of small protrusions 133 printed in metallic form with a thickness of from 0.1 mm to 0.5 mm And in this case, the step of small protrusions 133 also is preferably 100 μm or less, in the preferred embodiment, is 30 μm or less. The depth of the photoetching set equal 3-40 μm, while on the belt 134 form small protrusions 133, the height of which is from 70% to 200% of the film thickness, so that the belt 134 is screen belt.

The advantage of using a belt as a stencil body is easily achieved by obtaining body with a large size compared with the case is eat, when the stencil body of the platen. Regarding obtaining a body with a considerable length must also be noted as advantages the following two features. In accordance with the first feature, since the area of processing of the stencil increases for 1 turn of the belt, the processing of the film in an amount corresponding to the task, can be done by a small number of repetitions, and the wear of small ledges parts (belt) is reduced and the service life of the belt is increased. In accordance with the second feature, since the film after processing, you can enter in contact with the belt for a long time, it is possible to carry out Tervasaari in full. On the other hand, the implementation of the endless process of welding the belt requires advanced welding technology. However, since it is not required to form small ledges in the joined part of the printing plate for screen printing, but the printing plate for screen printing in the manufacture of stencil decided the length value in terms of one issue, then, if the joined part should serve as a welded part, the endless technological welding will be optional, in consequence of which will be solved and the corresponding problem.

In addition, by setting the working temperature is from, equal t°C, the melting point of the film, is m°and a glass transition temperature equal to g°With, the printing stencil can be accomplished with the application effort due to work pressure, denoted P, expressed in Pascals and equal to 104·102(m-t)/(m-g)or more, to get a useful cliche. This is explicitly confirmed by experiment.

In accordance with the trajectory of transportation stencil 12 can include any of the sets of technical means, which are shown in figure 9 or figure 10, and then applies a set of technical means shown in figure 1. On this basis it is possible to perform processing chain device for the manufacture of printed forms. In addition, in this machine for screen printing, appropriate present invention, it is also possible to provide an injection device for the manufacture of printed forms as sections of the manufacture of printed forms in a machine for screen printing.

In connection with the method of manufacturing the printed form designed for screen printing and implemented as described above, it should be noted that, since the stencil consists only of a film of thermoplastic resin, layering on the Foundation becomes optional. Therefore, the inconvenience caused by the presence of a base, excluding the differences. For example, the process of layering becomes optional. Optional become adhesives. Harmful influence on the print quality of such phenomena as "warp holes, permeable to ink", etc. made by adhesives in the manufacture of printing forms, is lost. Lost and harmful effects introduced by the fiber substrate, penetrating the hole of the perforated film, giving the effect of "underlining when printing". Although it is obvious that this will be the cause of "curls" at gluing materials of various types, there is a property that will allow you to easily remove this curl. In the case of the multilayered structure of the ink that is absorbed into the base, useless was lost, but in the case of structures containing only the film, such a useless loss of printing ink are excluded, because the film does not have any basis, having a thickness of approximately 20-30 times the film thickness.

In addition, although in the case of multi-layer compositions regular basis is the thickness of the film and was approximately 1.5 μm, in the case of structures containing only the film and corresponding to the present invention can provide a real opportunity to manipulate the film, because this film has a certain amount of thickness, for example, 4-5 μm (thickness characteristic of the tape cassette p is designated for audio playback) or more, in accordance with the increase in the hardness of the material according to its quality. Unless otherwise stated, when the thickness of the stencil is only the thickness of the film (approximately 1.5 μm) in the case of multilayer structures, printing plate for screen printing itself is too thin, and it will be hard to deal with. In the present invention, since the thickness of the film is not as small as the thickness of the multilayered composition known the basics, you can effectively prevent reverse the swelling and transillumination image on the reverse side imprint by transferring the excess ink on the printed sheet.

In the case of conventional multi-layer stencil, because the film is a thermoplastic resin with a thickness of about 1.5 μm perforined by heating thermal head, a perforated film of thermoplastic resin with a thickness of 4-5 μm or more cannot be done by heating the same thermal head due to insufficient energy generated by thermal head. Moreover, if the energy generated by thermal head increases, high heating energy is supplied to the printing roller, and therefore its harmful influence reaches bearing roller, which is not preferable from the point of view of the service life of thermal head. However, the ways through which and the manufacture of printed forms in accordance with the present invention although it is also based on the type of material of the film - the film becomes thick, having a certain amount, at least sufficient for easy manipulation of the film. Thus, the heating energy that is required when the perforation is large in comparison with the conventional case. The reason is that on one side of the film there are many small grooves. Because of this you can get a hole, permeable to ink, on the opposite side only by penetration of the film to such an extent that delivers the message with a small notch in the profile part.

Usually in the case of the stencil that contains only the film of thermoplastic resin, it is difficult to work with this stencil, if the film thickness is not big enough, and you need to increase your energy output of thermal head to heat the perforation. This is the main problem of exploitation. In accordance with the present invention, it becomes possible to implement thermal perforation permeable to ink holes without increasing the energy production of thermal heads, which contributes to solving the problems mentioned above.

Preferably, the heating energy is transmitted to the printing roller and the input terminal is eskay head to both sides of a thin film of thermoplastic resin, was as low as possible. To achieve this goal, it becomes possible to make the energy transmitted from thermal head to the printing roller, fairly small, because the generated energy of thermal head becomes small, and the small notch forms a heat insulating air gap.

In particular, since the film of thermoplastic resin is stretched, and the internal tensile stress, characteristic of the time of extension, is saved in this film, a crack is created only by thermal melting of small parts, and thus is formed a hole that appears in the small notch next to her. Therefore, not necessary to carry out heating up until the molten part will not be small indentations, and this contributes to the minimization of the energy produced thermal head. So that inside the film remained tensile stress characteristic of the moment of tension, it is necessary for machining, such processing pressure in the mold and contributing to the formation of small excavation was carried out at a temperature below the melting temperature of thermoplastic resin. In addition, the working temperature should be preferably higher than the glass transition temperature of thermoplastic resin, so that you was in order to form a recess under the influence of smaller efforts, due to work pressure, preventing the appearance of cracks in the film.

In addition it should be noted that the method of making printing plates according to the present invention can be implemented using a device for the manufacture of printed forms for screen printing. Film of thermoplastic resin with a uniform thickness is served in the device to form a notch on one side surface of the supplied film. Then heat up the opposite side surface of thermal head generates heat at low energy, so that the formed hole, permeable to ink, to obtain a printed form. The sequence of these operations can be performed using an independent device for the manufacture of printed forms inside the machine for screen printing in which such a device for the manufacture of printed forms performs the function partitions the manufacture of printed forms.

Industrial applicability

Method and device for the manufacture of printed forms for screen printing machine screen printing can be used in such techniques as screen printing.

1. Method of making printing plates for screen printing, whereby melted or melted talocalcaneal the material printed forms for screen printing, containing stretched film of a thermoplastic resin with a predetermined thickness by heating thermal head for perforating permeable to ink holes, characterized in that the retain inside the film mechanical strength characteristic of the time of stretching, and is formed by machining a lot of small notches on the merits on the entire one side surface of the film, heats only the side surface of the film opposite to the side with small grooves, using a thermal head, the heating energy of thermal head is sufficient for melting through the thin covering of a shallow indentations, but not sufficient for penetration through the thickest part, except for the recessed portion film, the orifices form a heated molten part, communicating with small notch.

2. The method according to claim 1, characterized in that two or more heaters located in the main scan direction in one sequence or layer on thermal head, and the spacing of the heaters on the side along the main scanning direction, is equal to the RM, the length of the heater-side along the main scanning direction, is equal to NM, pitch-side, running along the minor direction is the scan equal to PS, the length of the heaters on the side, along the secondary scanning direction, is equal to HS, and the size of the heater satisfies the inequalities NM>0,RM and HS>0,7PS.

3. The method according to any one of claims 1 and 2, characterized in that the energy of thermal head during printing is less than or equal to 35 MJ/mm2.

4. The method according to any one of claims 1 and 2, characterized in that the material of printed forms for screen printing contains the stretched film of polyethylene terephthalate (PET) or the stretched film with a low melting point, obtained by copolymerization of polyethylene terephthalate (PET) and polybutylene terephthalate (pbtf was honored with), the formation of many small grooves on the one side surface of the film is carried out by printing stencil, and at the operating temperature t°C, the melting point of the film m°and the glass transition temperature q°C the printing stencil is performed with the application of the efforts of the working pressure P, equal 104·1020(m-t)/(m-q)PA or more.

5. The method according to any one of claims 1 and 2, characterized in that the small notch is a penetrating hole having openings on both sides of the film, and the hole diameter on the heated side of the film is smaller than the diameter of the hole on the opposite side of the film, and the diameter is small with nepomuscene ink.

6. JV the property according to any one of claims 1 and 2, wherein the shallow recess is a depression, reducing the film thickness and forming the thin covering part.

7. Device for the manufacture of printed forms for screen printing that contains the partition supply of printed forms for filing a heat-sensitive printing plate for screen printing, containing stretched film of a thermoplastic resin with a specified thickness and many small grooves essentially on the entire one side surface of the film, the heating means for forming permeable to ink holes by heating only the opposite side of the film surface without grooves, and the heating means is a thermal head, located on the opposite side of the film surface without grooves, the device is made with the possibility of conservation of mechanical stress strain characteristic for time stretching inside of a film of thermoplastic resin and with a possibility of generated heat energy of thermal head is sufficient for melting through the thin covering of a shallow indentations, but not sufficient for penetration through the thickest part, except for the recessed portion of the film, with the formation of holes due to the heated molten part, communicating with small vemco is.

8. The device according to claim 7, in which the heating means is a thermal head, in which two or more heaters located in the main scan direction in one sequence or layer, and the spacing of the heaters on the side along the main scanning direction, is equal to the RM, the length of the heater-side along the main scanning direction, is equal to NM, pitch-side, running along the secondary scanning direction, is equal to PS, the length of the heaters on the side, along the secondary scanning direction, is equal to HS, and the size of the heater satisfies the inequalities NM>0,RM and HS>0,7PS.

9. Device according to any one of claims 7 and 8, in which the produced energy of thermal head is less than or equal to 35 MJ/mm2.

10. Device according to any one of claims 7 and 8, is arranged to perform a small notch in the form of penetrating holes with a hole diameter on the heated side of the film is less than the diameter of the hole on the opposite side of the film, and the hole diameter on the heated side of the film is small with nepomuscene ink.

11. Device according to any one of claims 7 and 8, is arranged to perform a small notch in the form of depression, reduce the film thickness and forming a thin covering part.

12. The mustache is a device according to any one of claims 7 and 8, containing means for forming many small grooves on the one side surface of the film.

13. The device for screen printing that contains the partition supply of printed forms for filing a heat-sensitive printing plate for screen printing, containing stretched film of a thermoplastic resin with a predetermined thickness, and heating means for forming permeable to ink holes by heating the opposite side of the film surface without grooves, the heating means is a thermal head, whereby the device is made with the ability to store mechanical stress strain characteristic for time stretching inside of a film of thermoplastic resin and with a possibility of generated heat energy of thermal head is sufficient for melting through the thin covering of a shallow indentations, but not sufficient for melting through thickest part, except for the recessed portion of the film, with the formation of holes due to the heated molten part, communicating with small notch.

14. The device according to item 13, in which two or more heaters located in the main scan direction in one sequence or layer on thermal head, and the spacing of the heaters on the side, ID is happening along the main scanning direction, equal to the RM, the length of the heater-side along the main scanning direction, is equal to NM, pitch-side, running along the secondary scanning direction, is equal to PS, the length of the heaters on the side, along the secondary scanning direction, is equal to HS, and the size of the heater satisfies the inequalities NM>0,RM and HS>0,7PS.

15. Device according to any one of p and 14, in which the produced energy of thermal head is less than or equal to 35 MJ/mm2.

16. Device according to any one of p and 14, is arranged to perform a small notch in the form of penetrating holes with a hole diameter on the heated side of the film is less than the diameter of the hole on the opposite side of the film, and the hole diameter on the heated side of the film is small with nepomuscene ink.

17. Device according to any one of p and 14, is arranged to perform a small notch in the form of depression, reduce the film thickness and forming a thin covering part.

18. Device according to any one of p and 14, containing means for forming many small grooves on the one side surface of the film.



 

Same patents:

FIELD: processes and equipment for making printing forms for screen printing, apparatuses for screen printing.

SUBSTANCE: method for making printing forms comprises steps of melting heat sensitive material of printing forms for screen printing having film of thermosetting resin of predetermined thickness by heating thermal head for perforating holes permeable for printing ink; forming large number of shallow recesses in one side of said film. Heaters of thermal head 10 have such size that next inequalities HM > 0.6PM, HS > 0.7 PS are satisfied. Heaters are arranged at pitch PM in side of main scanning direction. Length of heaters along side of main scanning direction is equal to HM. Feed stroke at side along secondary direction of scanning is equal to PS. Length of heaters at side along secondary direction of scanning is equal to HS. Side of film opposite to its side having shallow recesses is heated due to heating thermal head 10 with output 35 mJ/mm2 or less for melting heated zone until its communication with said recesses in order to form holes permeable for printing ink.

EFFECT: possibility for thermally perforating in film individual holes permeable for typographic ink at the same output of thermal head, realization of screen printing process at using material of printing forms for screen printing containing only film of thermoplastic resin.

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