Printed form for rotary screen printing, made of frp tanks

 

The invention relates to a printed form for rotary screen printing, made of fiber, and to a device for printing that uses this printed form. The printed form contains thin-walled hollow cylinder made of FRP tanks, while the wall of this cylinder is made with a constantly used the holes to seal, forming an image that should be printed. In accordance with the invention, the cylinder includes at least one layer having fibers with at least one direction of orientation of the fibers. The form can be obtained by using, in particular, multilayer laminates, made from epoxyacrylate having at least one layer with the direction of orientation of the fibers, which is parallel to the longitudinal axis of the printing form. This provides better print quality, the possibility of transporting and/or storing folded together forms. 2 N. and 16 C.p. f-crystals, 2 tab., 4 Il.

The invention relates to a printed form for rotary screen printing, containing thin-walled hollow cylinder made of FRP tanks, and the wall dunnoe should be printed.

The printed form of this type are described, for example, in NL-A-8802144. The cylinder used in this printed form, made of plastic, to which may be added as solid particles and/or fibers to improve the mechanical stability and strength. The cylinder wall is made with a large number of perforations of the small size, which form a grid of points, i.e., holes for printing, which form the image that should be printed. Holes for printing can be performed with a laser.

In US-A-3981237 also disclosed printing form made of plastic and designed for rotary screen printing, and the cylinder wall of this printing form can have one or more layers. This patent States that by the proper choice of plastic, such as a complex of the polyester, it is possible to achieve mechanical properties that are required when using the material as the material of the printing form. In this known printed form holes for printing the same image can be performed with a laser. Plastic can be filled with a reinforcing filler such as glass fiber. Such rotary screen mesh made of truncatellina materials are stapulionis fiber (short cut), which are distributed in the plastic randomly, even after stretching along two axes. Accordingly, the volume concentration of fibers is a maximum of 40%. However, the strength and rigidity of the grid, made so, leave much to be desired.

The above-mentioned printing plates, which are made of plastic and in which holes for printing, defining the printed image, also known in this technical field, as electrotyping, although the production of these printed forms are not actually provided any electrolytic deposition of metals.

In US-A-4959260 disclosed fabric, suitable for the manufacture of flat screen grid and consisting mainly of two-component fibers. Each of the component fibers has a shell made of a material having a high tendency of adhesion to the emulsion and the resin used for the preparation of the stencil from the grid, and the core is made of a material having high dimensional stability and ability to elastic recovery. In addition, the fabric must meet specific requirements in determining mechanical properties. In such a fabric or mesh made of it, there is no maratou print is difficult to manipulate and they are easily fractured, in particular, if the stencil is (still) contains a paste for screen printing. The thickness of the Nickel stencils, which is crucial to ensure rigidity, limited to the required hole size and number of screens and can be increased only to a certain extent when using standard technologies electrotype. In the case of plastics, in which the perforations can be performed using radiation energy, in principle it is possible to obtain more resistant to external influences of the printing form, which because of this they are easier to manipulate.

However, these known printing plates made of plastic, was not a commercial success. One possible reason for this is the generally low stiffness of plastics. The stiffness of plastics is about 100 times less than the hardness of Nickel, which is the preferred material for standard forms for screen printing. Nickel stencil has a modulus of elasticity E of approximately 90 GPA; a cylinder made with perforations and is made of a composite of polyester, which is one of the more rigid plastics, has a modulus of elasticity E of approximately 2 GPA.Oh screen printing, depend on the elastic modulus and the thickness of the wall of the cylinder. The electro polyethylene should have a thickness of approximately 0.89mm to provide the same level of rigidity, which provides Nickel stencil with a thickness of 0.1 mm, a Large wall thickness of the printing plate of this type has a negative impact on the scope and quality of printing and the formation of holes for printing with a laser. In addition, thick-walled printing plates of this type are less easy or even impossible to squeeze together for transportation and/or storage that is normal to thin-walled metal printing plates for screen printing, which can be transported and stored sdavlennym together in oval-curved form. In addition, it is known that under load plastics deform more easily in comparison with metals such as Nickel, as a result of creep.

As already suggested above, in accordance with NL-A-8802144 plastics can generally be made more stringent by the addition of fillers and/or fibers. However, in this Dutch patent application is not presented anything that could answer the question, how can be achieved given RMI, designed for rotary screen printing and is made of a fiber, in which the wall thickness of the cylinder is such that there is a negative impact little or no negative impact on the print quality and the ability to make holes for printing with a laser, and the possibility of transporting and/or storing forms, compressed together.

Another object of the invention is to develop a printed form designed for rotary screen printing and made of fiber-reinforced materials, mechanical properties which are improved compared to the printed form of plastic (FRP tanks), described in the prior art.

In accordance with the invention of the printing form for rotary screen printing the above-described type, characterized in that the cylinder contains at least one layer having fibers in at least one direction of orientation of the fibers. One layer of plastic with the fibers entered into it, which is oriented in the same direction (below also called unidirectional fibers) has anisotropic elastic properties, i.e. properties depend on the direction in which a load.

Add wolokoton short cutting (also known as “stapulionis fiber”), in the form of long fibers, which are randomly distributed in the plastic and in the form of unidirectional fibers. The use of unidirectional fibers in principle provides the greatest rigidity, which can be achieved. In addition, the high fiber content can be achieved in the presence of layers with unidirectional fibers, and therefore, these fibers can be achieved highest modulus of elasticity.

As already mentioned, one plastic layer having unidirectional fibers, has anisotropic elastic properties. According to the invention this anisotropy is used to limit the deformation in the direction of action of the load.

In this description, the fiber is understood to mean a layer of plastic binder, in which is inserted a reinforcing fiber. In accordance with the invention, these fibers are oriented in the same direction.

In addition to the normal use of the printing form according to the invention for a rotary stencil printing in which the printing ink or paste for screen printing is applied on a substrate, on which shall be printed, through continuously used the holes for printing, the printing form is also suitable for the NGO type, intended for formation of a coating is a hot melt adhesive. In other words, the expression “rotary screen printing” is not limited to using the printing ink or paste for screen printing for printing on a substrate, but rather, in a broad sense, includes applying a material on a substrate through permanent openings during rotation of the printing form. Screen mesh according to the invention may be a regular grid, from which it is prepared stencil, using standard technology of photolithography, so remain open only the holes in the grid, which form the image to be printed, i.e. the so-called “permanent openings for print, while the other holes in the mesh are closed and/or filled otverzhdennye areas of the photoresist. Screen mesh according to the invention preferably is an electro containing only permanent openings for printing that can be done with a laser.

In the process, many of the loads acting on the printed form at the same time, but in different directions. Thus, in accordance with one variant osushestvleniya different directions of orientation of the fibers, such as woven or braided material of the fibers, the Mat of fibers or fabric fibers.

To reduce the overall degree of bending is preferable to one direction of orientation of the fibers is parallel to the longitudinal axis of the printing form, i.e., coincides with the axial direction.

In accordance with another embodiment of the printing form according to the invention, the cylinder includes a first layer having fibers with the first direction of orientation of fibers and a second layer having fibers with a second direction of orientation of the fibers, with the first and second directions of orientation of the fibers are not identical. As already mentioned, the individual layers having unidirectional fibers, may have a high content of fibers (see fiber content, constituting 63%, for unidirectional carbon fiber in epoxy with fiber content, constituting approximately 35 vol.%, for non-woven fabric in epoxy resin), which is preferable for the elastic properties. The cylinder of this type for the printing form according to the invention consists of at least two layers of fiber-reinforced materials in which the fibers in one layer are oriented in the same direction and the direction of the fibers is not �/chr/945.gif" border="0">with the longitudinal axis of the printing form, and the direction of orientation of the fibers of the second layer forms an anglewith the longitudinal axis of the printing form. The cylinder preferably also contains an additional layer having fibers with a third direction of orientation of the fibers, with the fiber direction of this additional layer parallel to the longitudinal axis of the printing form. More preferably, if the additional layer is located between the first and second layers.

Examples of angleare angle equal to 45° angles >60°. Thus, a three-layer laminate designed for use in printed form, according to the invention contains 3 layers with different directions of orientation of the fibers, for example, an angle of 0° and ±60°, 0° and ±45°, 0° and 90° (×2) relative to the longitudinal axis of the printing form.

According to another variant implementation of the printing form in accordance with the invention, the first layers with the first direction of orientation of fibers and second layers with the second direction of orientation of the fibers alternate with each other. One example of a variant of implementation of the printing plate of this type is a printing form, the third layer and the direction of orientation of the fibers of the second and fourth layers are identical.

In accordance with a particularly preferred embodiment, the cylinder has a symmetrical structure in the thickness direction, and the direction of orientation of the fibers most of the exterior, the first layer forms an anglewith the longitudinal axis of the printing form, and the direction of orientation of the fibers of the second intermediate layer forms an anglewith the longitudinal axis of the printing form. In this embodiment of the invention the cylinder is also preferably contains an additional layer having fibers with a third direction of orientation of the fibers, with the direction of orientation of the fibers parallel to the longitudinal axis of the printing form. As in the cylinder containing the layer 3, which was discussed above, the additional layer preferably is located between the second intermediate layers, i.e., in the center, when viewed in the direction of the wall thickness of the cylinder.

In the above-described multi-layer laminates, which are used for manufacturing the printing plate according to the invention and which contain additional layer having fibers with the direction of orientation of the fibers, which is parallel to the longitudinal axis of the printing form, the thickness of this Supplement is the areas of orientation of the fibers, as a rule, have an identical thickness of the layers. Depending on the thickness (diameter) of the fibers and the predetermined final thickness of the cylinder of the printing form according to the invention this printed form can also contain a set of neighboring layers have the same direction of the fibers.

The presence of at least one layer having unidirectional fibers with at least one direction of orientation of the fibers, or a combination of layers of this type in printed form according to the invention provides the ability to maintain low total wall thickness, preferably in the range of from 80 to 300 microns, so that the print quality is good. The small thickness of the printing plates of this type also allows you to make holes for printing by using a laser, in accordance with the figure, which should be printed. In addition, the printing plate can be bent into oval-curved shape that is suitable for transportation, and, therefore, can be squeezed together.

The mechanical properties of the printing form according to the invention are also good, as will become evident from the following, more detailed consideration of the load, which acts on the printing plate for screen printing or stencil usually clamped on the printing machine above the support surface in the form of an endless belt. Bearing surface in the form of an endless belt of this type is an infinite tape, which is temporarily attached to the substrate on which shall be printed. Anchor roller serves to support the supporting surface in the form of an endless belt in each working position on a printing press. In printed form, there is a rubber squeegee, which feeds the paste for screen printing and provides squeezing it through the holes for print, made in the wall of the cylinder of the printing plate moving forward substrate. Load, the impact of which is exposed printing plate in the printing process, is caused by contact between the printed form, on the one hand, and, on the other hand, a rubber squeegee, a paste for screen printing and substrate, on which shall be printed. The printed form is moved past the fixed rubber squeegee, which causes a friction force directed opposite to the direction of rotation of the printing form. The shearing forces pastes for screen printing also act in this direction. To partially offset these efforts, the infinite speed l the second form; in other words, it is argued that the endless belt is ahead of the curve with respect to the stencil. Therefore, from the substrate to the printing plate, the force of friction, which is directed opposite to the force of friction acting on the part of a rubber squeegee. The resulting maximum load that acts on the printed form and also known as the force acting when printing, is a load uniformly distributed in the direction tangent to the lower side of the printing plate in the place where the printing plate is in contact with a rubber squeegee and a substrate on which shall be printed. The result is that the image that should be printed onto the substrate in the form of the curve, i.e. the curvature occurs if there are differences in deformation. The above resultant maximum load for Nickel stencil having a thickness of 0.1 mm and a printing width equal to 1850 mm, is approximately 0.1 N/mm When exceeding this load occurs bending with torsion. To prevent this bending of the printed form to create the initial tension in the axial direction of the 1,000 N. For longer trapar is the straight line in the image, which should be printed, appears in the form of a curve on a substrate. The factors that contribute to this curvature, are local deformation of the printing plate (clean) torsion of the printing form and (pure) bending the printing plate. Local deformation occurs due to the fact that the printing plate is held only at the two ends by means of end rings. Twist the printing plate is adjusted by adopting a skewed position, similarly leading to the curve formed on the substrate. Of these factors the local deformation represents the factor that makes the greatest contribution to the curvature. In printed form according to the invention the counter of the local deformation is achieved through the use of unidirectional fibers in one or more layers of one or more different directions of orientation of the fibers.

The direction of orientation of the fibers, the thickness of layers and the material can vary, although there are preferred directions and materials as mentioned above and as will be illustrated below in more detail.

If desired, in printed form according to the invention can be combined layers of material cilindro unidirectional fibers.

As mentioned above, the materials of the fibers and plastic binder matrix can be selected depending on the given properties. Examples of suitable materials fibers include carbon fibers, inorganic fibers such as glass fiber and boron fiber, metal fiber and organic polymer fibers, such as elongated fibers, for example, aramid fiber and fiber from extruded high strength polyethylene, and combinations thereof. Particularly preferred carbon fiber and inorganic fiber, and of these the most preferred carbon fiber. The binder material used is not critical, since it makes a small contribution to the mechanical properties in comparison with the fibers, and may be selected from known thermoplastic resins such as polyester resins and thermosetting plastics such as epoxy resin. From conventional composite materials is preferred epoxyacrylate, given the excellent correlation between the production cost and rigidity. The rigidity of this combination is actually twice the stiffness of the fiber-based epoxy resin with filler, representing Kevlar, and three times geut polyaminocarboxylic, volokita based on epoxy resin with a filler of graphite fibers and volokita on a ceramic base with a filler made of fibers of silicon carbide. However, these composite materials are expensive. The above-mentioned single-layer industrial materials are produced and are available on the market.

Elastic properties for a number of single-layer combinations of fibers and binder are described, in particular, in book I. M. Daniel and other "Engineering Mechanics of Composite Materials", Oxford University Press, 1994, and listed below in table 1.

Elastic properties quasiisotropic laminates are shown below in table 2.

The material layers may, in addition to the above-mentioned binder and unidirectional fibers, optionally also contain other conventional additives such as lubricants, substances that increase the adhesion strength, fillers, pigments, etc.

In addition, if necessary printing form according to the invention can be performed with one or more surface layers, which contain no fiber and have the specified properties, in particular layers of plastic on the inner and/or outer side of the cylind to scratching, hydrophobicity, increasing contrast and durability. The increase in contrast may be preferable in that case, if you want to make holes for printing, having a very small size, and the picture that they form, easily visible under certain angles of view, and this is achieved, for example, by applying a white surface layer of polyethylene on the outer circumferential surface of the black cylinder, made of epoxy resin containing carbon fiber. The surface layer of polytetrafluoroethylene, such as TEFLON, may be provided to reduce friction.

The invention also relates to a device for rotary screen printing, equipped with a printing form according to the invention.

The invention is explained below with reference to the accompanying drawings, where:

Fig.1 shows a schematic depiction printing plates for rotary screen printing in ISO;

Fig.2 is a schematic depiction of a layer of fiber with a certain direction of orientation of the fibers;

Fig.3 is performed with a spatial separation of the elements is a schematic depiction of a symmetric three-layer laminate; and

Fig.4 is performed with a spatial restotation screen printing, which contains a thin-walled hollow cylinder 12 made of FRP tanks. This cylinder is made of punched holes in accordance with the figure, which should be printed by using high energy radiation, for example, with a laser carbon dioxide. These perforations form a hole 14 for printing, define (forming) image 16 and 18, which should be printed and which in the shown embodiment, the invention represent the entire area of a circle 16 and the full area of a rectangle is 18.

In Fig.2 shows a flat layer 20 of the fiber, having a fiber 22 (schematically shown a relatively thin solid lines) when the direction of orientation of these fibers parallel to the longitudinal axis of the cylinder, which should be made of this layer. This axial direction of the fibers is preferable to reduce the overall bending of the printing form 10.

For simplicity, in the following drawings, identical elements are denoted by identical reference numbers.

In Fig.3 schematically shows a three-layer laminate 30 in which the middle layer 32 consists of a layer of fiber, shown in Fig.2, i.e. the layer in which the fibers 22 proboaly 34, fiber 22 which is oriented in the direction perpendicular to the longitudinal axis. Laminate with unidirectional fibers of this type can be formed, for example, using conventional methods, such as the process of obtaining a uniaxial oriented fibrous plastic, injection molding, laminating and winding, and may be machined, if necessary, by grinding, polishing, etc. Suitable way to obtain the tubular body is disclosed in US-A-5 071 506, after which the body perforined to run continuously used holes for printing. With this method of composite material onto the mandrel having an inflatable elastic balloon. The mandrel into unilocular the mold. When the pressure in the inflatable elastic balloon composite material is pressed to the wall of the mold. Subsequently, the composite material is cured.

In Fig.4 shows a schematical diagram illustrating the multilayer structure of example five-layer laminate 40 according to the invention in a flat view. The laminate 40 symmetric structure contains the middle layer 32, in which the fibers 22 are oriented in the longitudinal direction of the printing form, which is where the direction of the fibers forms an angle=-70° with respect to the longitudinal axis. The outer first layers 46 have fiber 22, which is oriented at an angle +70° with respect to the longitudinal axis.

In the following table 3 shows the data on the deformation of laminates based epoxyacrylate (Ex=142 GPA; EY=10.3 HPa; Gxy=7.2 GPA and=0,27; the circumference of the plate cylinder =64 cm) with different values of the layer thickness and the directions of the fibers. In order to compare the data on the deformation of Nickel stencil and the printing plate made of an isotropic epoxyacrylate (E=56,7 HPa; Gxy=22,0 HPa;=0,286), as well as data on the deformation of epoxy resin per se (E=4 GPA) and polyethylene terephthalate (E=3 GPA) (cf. examples 1 and 20-21). The maximum value of deformation (in mm) in the center plane of a substrate on which is printed the image shown for two values of the width of the printing components 1620 and 1850 mm

1angle (°) the direction of the fibers relative to the longitudinal axis of the printing form;

2thickness (mm);

3the polyethylene terephthalate;

4composition 63 volume%);

5composite material based on epoxy resin with stapulionis fibers (fiber content 40 volume percent, E=20 GPA).

For seven-layer laminate, in which each layer has a thickness 0,028 mm (total thickness 0,169 mm) and fibers in successive layers oriented at angles -60, 60, -30, 0, 30, -60, 60° relative to the longitudinal axis, the maximum strain at 1.38 and 2.00 width of printing, component, respectively, 1620 and 1850 mm If the thickness of each layer is to 0.032 mm (total thickness 0,224) these strain values are respectively 1,13 and 1.61.

From the above examples, in particular, it is apparent that the printed forms, which are made of three-layer laminates and have a middle layer that has a thickness 0,084 mm and fiber, which is parallel to the longitudinal axis (=0°), the maximum strain decreases with increasing anglewhile the thickness of most of the outer layers remains constant (cf. examples 6, 10, 12 and 13). It should be noted that in practice the choice of the direction of the fibers will partly be determined by the reproducibility of the production technology used and the total cost. For example, it was useout unidirectional fibers, which are directed at an angle of 90° with respect to the longitudinal axis of the printing form, through the winding (and, hence, in this case, additional costs) than to wind a layer of this type with the direction of the fibers at an angle less than 90°, for example 85°, relative to the longitudinal axis.

The preferred position of the layer with the fiber direction, which is parallel to the longitudinal axis, can be seen by comparing examples 6 and 11. In addition, the above examples clearly show the influence of the layer thickness (see, e.g., example 3) at given constant angles and the effect of number of layers (cf. examples 15 and 16, 3 and 10) at maximum deformation.

Claims

1. Printing form (10) for a rotary stencil printing, containing thin-walled hollow cylinder (12) made of FRP tanks, and the cylinder wall is made with the ever-used holes (14) for printing, the defining image (16, 18), which must be printed, characterized in that the cylinder (12) contains at least one layer(20, 32, 34, 32, 44, 46), having fiber (22) with at least one direction of orientation of the fibers.

2. Form p. 1, characterized in that the cylinder (12) contains reinforced the .1 and 2, characterized in that the direction of orientation of the fibers parallel to the longitudinal axis of the printing form (10).

4. Form p. 1, characterized in that the cylinder (12) includes a first layer having fibers with the first direction of orientation of fibers and a second layer having fibers with a second direction of orientation of the fibers, the direction of orientation of the fibers are not identical.

5. Form under item 4, characterized in that the direction of orientation of the fibers of the first layer forms an anglec the longitudinal axis of the printing form (10), and the direction of orientation of the fibers of the second layer forms an anglewith the longitudinal axis of the printing form (10).

6. Form according to any one of paragraphs.4 and 5, characterized in that the cylinder (12) contains an additional layer (32) having a fiber (22) with the third direction of orientation of the fibers, with the fiber direction parallel to the longitudinal axis of the printing form (10).

7. Form under item 6, characterized in that the additional layer (32) is located between the first layer (34) and second layer (34).

8. Form according to any one of paragraphs.4 and 5, characterized in that the first layers having a first direction of orientation of the fibers, and the second layers having a second directed the symmetric structure in the thickness direction and the direction of orientation of the fibers most external, the first layer (46) forms an anglewith the longitudinal axis of the printing form (10), and the direction of orientation of the fibers of the second, intermediate layer (44) forms an anglewith the longitudinal axis of the printing form (10).

10. Form under item 9, characterized in that the cylinder contains an additional layer (32) having a fiber (22) with the third direction of orientation of the fibers, with the fiber direction parallel to the longitudinal axis of the printing form (10).

11. Form under item 10, characterized in that the additional layer (32) is located between the second, intermediate layer (44).

12. Form according to any one of paragraphs.6, 7, 9-11, characterized in that the thickness of most of the exterior, the first layer (46) is identical.

13. Form according to any one of paragraphs.6, 7, 10 and 11, characterized in that the thickness of the additional layer (32) is greater than the thickness of the other layers(34, 44, 46).

14. Form according to any one of paragraphs.1-13, characterized in that the fiber is composed of unidirectional carbon fibers in an epoxy matrix.

15. Form according to any one of paragraphs.1-14, characterized in that the total thickness of the wall of the cylinder of the printing form (10) is in the range from 80 to 300 μm.

16. Form p. 1, characterized in that the cylinder (12) is made of quasiisotropic laminate (12), a surface layer, which does not contain any fibers.

18. Device for rotary screen printing include printing form (10) according to any one of paragraphs.1-17.

Priority items:

18.10.1999 on PP.1-16; 18;

02.12.1999 under item 17.



 

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