Method and device for making polymer film oriented at angle to film lengthwise axis

FIELD: process engineering.

SUBSTANCE: flexible film sleeve 10 is cut in helix to flat strip by unwinding the film by rotary unwinder 1 on feeding flat film to sleeve expansion zone. Flat sleeve expands in said zone to round cylindrical sleeve to be passed axially above hollow mandrel 14 that feature OD slightly smaller than expanded sleeve diameter. Cutting is performed by knife 18 arranged at mandrel to flat strip moving off toward mandrel axis at an angle. Flat sleeve is stretched in lengthwise direction by tensioning tolls 107-112 revolving jointly with aforesaid unwinder. Besides, proposed device comprises stabilising means to stabilise orientation created by said tensioning rolls as applied to strip cut in helix after withdrawal from the mandrel.

EFFECT: higher film stabilisation, particularly, that thin laminar plastics.

22 cl, 3 dwg

 

The invention relates to a method and apparatus for manufacturing polymer film, which is oriented at an angle to its longitudinal direction. Obliquely oriented film is used mainly for the manufacture of cross-laminates, whereby two or more such films are continuously brought together in such a way as to make them a direction of crossing each other. The connection may be by means of a strip of film extruded in a place where the oriented films are found (i.e., extrusion lamination or heat and pressure with the aid together extrudable surface layers. Manufacturing technology cross-laminated plastics is described in detail in WO 08/006858 (Rasmussen), published by WIPO. The compositions of the polymer film, which has been used on an industrial scale for cross-laminated plastics, have mainly been based on HDPE, LLDPE (and their mixtures) or crystalline polypropylene.

Almost all used on an industrial scale technology cross-laminate uses cutting spirally oriented tubular film. The first patent in this regard is GB 816607 (Rasmussen), which takes priority from 1954. A particularly practical way of carrying out such a process and device for this is the process known from U.S. 5248366 (Rasmussen) and U.S. 5361469 (Rasmussen), both with priority from 1988. The steps defined in the preamble of paragraph 1 of this invention formula known from these patents.

Manufacturing oriented at an angle film for cross-lamination requires stabilization orientation before lamination, otherwise a variety of films in laminated plastic will gradually increase the internal tension when storing the coil, and tension have different directions in different films, corresponding to their different directions of orientation, and this will give a layered plastic strong tendency to twisting or folding when he is released from the coil. It is known that, using conventional technology, at least part of this stabilization should take place before winding stable flat sleeve, otherwise the film on the coil is deformed, and the coil core can even be crushed.

As described in WO 05/102669 (Rasmussen), the stretching is preferably performed at a relatively low temperature, which for films of polyethylene HDPE and polypropylene is preferably in the range of about 20-50°C, as this gives the best properties stretching in different directions. The latter refers to a sufficient combination of tensile strength, yield strength, resistance to disseminate the structure of the tear and puncture resistance. However, the choice of low temperatures leads to a more complex conditions stabilize, too low - stabilization gives the finished cross-layered plastic strong tendency to twisting, and too high - stabilization makes the film too two, thereby reducing the resistance to propagation of the rupture cross-laminate. Part of the problem is that in an industrial scale with a relatively high speed film should be relatively high tension in the machine direction of the film, that is parallel to its direction of orientation.

The present invention aims at the reduction of such problems of stabilization and aims to rationalize process stages in the production of cross-laminated plastics. This is of particular importance in the manufacture of extremely thin cross-laminated plastics, and, thus, the advantage in strength to save the cost of raw materials. In addition, it is important that such savings are mainly not compensated by excessive conversion costs.

The present invention is characterized by the totality of features set forth in the claims.

In the experiments, prior to the present invention, the inventors have stretched relatively short PLoS is the third sleeve thickness 0.10 mm film of polyethylene HDPE at 20°C, and had it wrapped without stabilizing it. Directly after that, she was cut in a spiral at an angle of 45° and then stabilized by passing through hot rolls at 70°C, located close to each other. It turned out that the stabilization thus become more efficient and unmixing below.

In accordance with this fact, the present invention is to perform stretching in turning the coil, which is used together with reveal in a spiral, and in the implementation of stabilization after cutting in a spiral. More specifically, the invention concerns a method of manufacturing a polymer film, a uniaxially oriented at an angle to its longitudinal direction in which the flat tubular film longitudinally oriented between the idler rollers and stabilize, and after orientation cut out the spiral first by unwinding from the reel (9) in the unwinding stand (5), which performs a rotary motion to rotate the flat sleeve around its longitudinal axis passing line, and then inflated by pulling on the mandrel (16) and uniform feed screw movement. Each point on the surface of the film follows a spiral, and open carry a knife (18)located in a stationary position, and then cut in a spiral film is removed from the mandrel. Image is eenie distinguishes those said tension rolls (108-112) installed in a rotatable unwinding stand to perform orientation as the phase between the unwinding and inflating a flat film, and additionally characterized in that the stabilization is performed after the cutting in a spiral.

As for unwinding stand, there are two fundamentally different designs, shown both in each of the above U.S. patents No. 5248366 and 5361469, figures 1 and 3. Figure 1 is a coil that needs to be unwound, installed in a rotatable unwinding stand, with its axis perpendicular to the axis of rotation, while in figure 3, the axis of the coil coincides with the axis of rotation of the stand, and a rotator that rotates the film, so that its axial line coincides with the axis of rotation of the decoiler.

In the two above-mentioned U.S. patent flat sleeve is inflated to form a sleeve through air is continuously blown through the mandrel, which is hollow. This air is discharged into the environment through the space between the outer surface of the mandrel and the inner surface of the tubular film, and thus the movement of the film over the mandrel to the cutting knife becomes air lubrication. Moreover, the film during the blow sent by belt conveyors. These two precautions, the use of blown air is support ribbons, also preferred, but not required in connection with the present invention. Alternatively, a ring of guide rollers located around the end of the mandrel can inflate and spiral flow tubular film. These rolls must be driven in accordance with rotation of the unwinding stand and tool, which unwind the film in this stand.

It turned out that the cut in a spiral unoriented film can be wound on a reel without causing any strain since the coefficient (E) of elasticity in the new machine direction is small, and hence the required stabilization can be performed in a separate processing line, but usually stabilization should be performed in line with the reveal of the spiral.

Usually, but not necessarily, stabilization is created by heating, preferably by passing the film S-shape through a series of closely spaced heated rolls. The best result is achieved when these rolls are also slightly stretch the film in the new machine direction, preferably between 5-10% elongation. This helps to smooth out small wrinkles and other irregularities in the film, at the same time, reducing the separation.

An alternative way to perform stabilization, applicable mainly when you need relief structure of the film, the conclusion of which is the stretching of the film by means of transverse tension between being in engagement round rollers or rollers with helical grooves. In this case, corrugated rolls with sharp peaks riffles create the most severe terrain and the most effective stabilization.

In one embodiment, the tension in the unwinding stand occurs between closely spaced corrugated rollers, which the film passes S-shaped. Between the unwinding and stretching in the unwinding stand film can be provided with corrugations, passing in the longitudinal direction along its entire length, and the size of each corrugation is small enough, and the distribution is fairly uniform corrugations, so that the shirring disappeared under tension. This precaution allows the film to follow an inherent tendency to decrease its thickness under tension, and this facilitates the process orientation. How corrugation of the film before the longitudinal stretching is described in U.S. 3233029 (Rasmussen) and WO 09/056601 (Rasmussen).

As will be clear from the foregoing, the present invention is especially useful for stretching and cutting in a spiral film of small thickness, where it is important to simplify the manufacturing process and reduce the processing cost. This film of small thickness will be relatively high orientation during melting, thus the stretch factor in turning unwinding stand will be relatively small, for example between 1.5:1 and 2.5:1. Therefore the required depth of the corrugations is less and device for corrugating relatively simple.

However, tension in the unwinding stand between closely spaced smooth rolls can also be made without prior corrugation of the film. This means that the flat edge of the sleeve will be thinner than the remaining part, because they reduce its transverse dimension, while the rest of the film denied the opportunity to do the same. Therefore, the reduction of thickness at the edges is less than the reduction in the thickness of the remaining film. In the traditional method of stretching, in which there is no rotation and cutting in a spiral, this means that the usual winding the stretched film is impossible, since the thickness at the edges overlap and gradually deform the film. When using the present invention, the flat edge of the sleeve will also be thinner than the remaining part, but after cutting in a spiral of initial edges form an angle with the machine direction, and differences in thickness will not accumulate when the film is wound on a reel.

In another embodiment, at least part of the tension in the unwinding stand is performed between one or more pairs of rolls, provided with teeth, passing in the direction of the axis of the roll, whereby the teeth in each pair of rolls which engage with each other. Also in this case, the film may be provided with corrugations, etc is walking in the longitudinal direction, before she meets the first pair of rollers with teeth or alternate stretching can be performed without such corrugation.

The result of this stretching rollers with teeth, which in itself is prior art, is typically a film in which the degree of orientation changes gradually. In some cases, it may be an advantage when you want relief structure. Also note that there is a known technology in which two pairs of rollers with teeth, working together, coordinated in such a way that together they form a nearly uniformly stretched film.

No matter which of the above embodiments is used, a suitable composition of the film for most applications can traditionally contain 50% or more of HDPE, LLDPE or crystalline polypropylene, since these polymers are low, their elongation is very good and the resulting strength is high.

The invention will be described in more detail with reference to the drawings, in which:

figure 1 process map showing all process steps are performed sequentially;

2 is a schematic drawing showing a top view of the device for performing the process steps from the link on the technological map 1) unwinding extruded flat sleeve until the race is Roy spiral mandrel. For simplicity of the drawing, it shows the cut in a spiral film is wound up to stabilization because it actually can be done, although it is usually necessary to perform stabilization in line with reveal spiral;

figure 3 shows a modification of the tensioning system (rolls 107-112) with figure 2, namely systems in which the tension is partly between acepsimas rollers with teeth (103 and 104). It is clear that the rollers (101)-(106) is installed in the swivel stand (1), so that they replace the rolls(107)-(112).

With reference to figure 1, the stages up to and including "Cutting in a spiral mandrel will be described in connection with figure 2.

The stage of "stabilization" usually means thermal stabilization stabilization by passing between mutually acepsimas grooved rollers is also possible, if the relief shape of the film is acceptable or even required, and in special cases can be selected stabilization radiation.

Heat setting is usually performed by passing through a series of rolls heated to for example 70 to 90°C and located near each other. During this transmission of the film is preferably stretched, usually with a ratio of 1.05:1 and 1.2:1, because this can improve stabilization, at the same time reducing the separation. The rolls can be positioned similar to the rolls shown in figure 2 for barbantini rolls(107)-(112).

Stabilization by passing between acepsimas corrugated rolls usually uses round corrugated rolls, and in this case, the step riffles at each felling can be mechanically reduced to about 1.0-1.2 mm, which is preferred. However, the roughening can also be helical. This stabilization corrugated rolls can be performed at ambient temperature or at elevated temperature.

Block "extra steps" contains various possibilities. One is shirring. The second is atrial in the direction of orientation, to form a fibrous structure, as is known from the prior art atrial oriented films. More important, however, this stage can be cross-lamination with the same, simultaneously created, obliquely oriented film. However, cross-lamination may occur later in a separate processing line.

The device 2 includes a block (1) "a swivel stand, which has a shaft (2) at one end and rotates around the axis of the shaft supported by the casing (3) through heavy roller bearings (4). Column (3) is installed on the floor of the room. For simplicity unwinding unit (1) is shown having a housing consisting of one end plates (5) and two side plates (6). Drawing p is found the unit at the time of rotation when these side plates are in a horizontal position and only the top plate is indicated by a dashed line is visible. Almost frame, mostly from steel profile, may be preferable plates, because it is easier and more convenient.

"Unwinding stand, with unit (1) includes rolls, which will be described below, are too heavy to be supported only heavy roller bearings (4), and hence this support is supplemented by one or more large steel rings that surround and form part of the rotating unwinding unit, and which is placed on and rotated by the set of supporting rollers or supporting wheels and thereby perform the function of the bearing rings. Alternatively, a bearing attached to the floor, can form part of one or more rings, which are placed and rotate one or more groups of rollers or wheels that surround and mounted on a rotating unwinding unit. Such a system is shown in figure 3 U.S. patents 5248366 (Rasmussen) and U.S. 5361469 (Rasmussen), but for simplicity are not shown in this figure 2.

The supporting column (3) is fixed a gear wheel (7), which is meshed with another gear wheel (8)mounted on an end plate (5) and, therefore, reports of planetary motion. Wheel (8) actuates R is lichnye rollers and wheels in the block (1), but for simplicity, the transfer for these movements are not shown.

Coil (9) with flat extruded tubular sheet (10) is installed through bearings in the side plate and is equipped with brakes, and bearings and brake are not shown. Flat sheet (10) is removed from the coil through a set of exciting rolls (107) and (108), and the second is the slave of the steel roller and the first is a rubber idler roller.

Steel roller (109) located near the roll (108) and is driven with the same peripheral speed. Steel roller (110) is driven with a greater peripheral speed that is selected to create the desired stretch factor (variable replacement gears or sprockets). Steel roller (111) is driven with the same peripheral speed as the roller (110)to receive a part of the tensile forces, and roll (112) is rubber exciting roller. Exciting rollers (11) rotate at the same peripheral speed as the rollers (111) and (112).

To avoid gradual heating rolls (109) and (110), it is important that each of these rolls was maintained at a constant temperature by circulating a cooling/heating fluid, preferably water. To enter and exit the water in and out "of the rotary stand" (1) Val (2) must consist of concentric tubes, bitsadmin using the rotary coupling.

However, the most convenient is the location of one of the water circulation system for rollers (108) and (109)to allow stretching at elevated temperatures, and other water circulation system for rolls (110) and (111)to cool the stretched film, and both systems pass through the shaft (2) and the rotary coupling. For simplicity, these circulation systems are not shown.

Between the coil (9) and the first roller (107) in a series of stretch rolls of film (10) may be provided with a small and evenly spaced corrugations that provide lateral compression during longitudinal stretching. As mentioned above, the device for such corrugation disclosed in U.S. 3233029 and WO 09/056601. When the film has already taken the necessary longitudinal orientation during melting, and the stretch factor in turning the coil thus limited, for example, range between 1.5:1 and 2.5:1, shirring device can be simplified, for example, to consist of the tension roll crown shape and one pair of mutually siteplease corrugated rolls, as shown in the aforementioned U.S. 3233029.

The drives between the gear wheel (8) and rollers (11) are determined by the angle of cutting. Preferably, execution of the gear ratio variable, for example by providing the possibility of changing gears. There is a cylindrical mandrel (14) for cutting, air jet, that is s to inflate the sheet (10), forced by the fan (13), such as a centrifugal fan, through the mandrel in the direction of the rolls (11).

The mandrel is installed on the floor using columns (15) and creates a relatively tight fit with the sleeve sheet (10)which slides over it. The air will enter through the narrow space between the mandrel and the sheet and will create the effect of lubrication. The end (16) of the mandrel may be struglin to avoid jamming of the sheet.

It is clear that the axis of the inflated sleeve (23) essentially coincides at least with the axis of rotation of the unwinding unit 1 and the axial line of the flat tubular film (10)passing through the rollers (11).

In order to achieve a smooth helical movement of the inflated bag sheet, it is preferable (and may even be necessary if the leaf is wide) to provide mobile support from the first position to a position in which the sleeve is inflated. A suitable support for the inflated sleeve may be a pair of belts, and as shown in figure 1 there are two pairs of driven belts (17), which support the sleeve against the current in the opposite direction of the force of the air leaving the mandrel (14) towards the first position, and contribute to a gradual change in the shape of a sleeve from a flat shape to a cylindrical shape. The belts are driven in generally the same speed as the speed of the sheet, or with greater speed Instead of using two groups of belts, a pair of single straps or two groups of rolls having a relatively small diameter (only the last swath is necessary to set in motion) can be used. For a relatively narrow flat sheet, one pair of driven barrel-shaped rolls of large diameter may be sufficient.

Bag sheet to cut out the usual knife or razor blade on a support (18), which can be conveniently attached to the mandrel under adjustable angle. Edge (19), which is shown in the drawing to the left of the knife, which becomes the right edge of the finished sheet, it moves down and under the mandrel for cutting. The knife can rotate or vibrate, to perform the cutting.

Cut the sheet stretches driven winding unit (20), which is shown schematically. Angle cutting, as indicated, is defined by the ratio between the speeds of rotation of the block 1 and the rolls 11, but the direction of the knife or blade and thrust applied by the block (20)must also be adjusted so that they approximately match the angle of cutting, the specific rotation. Winding unit (20) includes a floating roller (21) and two additional idler roller (22) to control the speed of the reeling device (20) and, thus, installing the appropriate tension.

Appropriate regulation of the air pressure inside of the sleeve relative to the pressur is I the ambient air around the sleeves) large tension can be applied by the block (20) (except in the case of extremely fragile sheets, when it is necessary to use lower tension). Thus, when cutting a flat sheet with a thickness of about 100 μm and a width of 1 m, the tension of from 5 to 20 kg/m total length generally applicable.

The location of the rolls shown in figure 3, can replace the location of the rolls from the roll (107) to roll (112) figure 2. Can even be made so that two locations conveniently rolls could be replaced with each other in the same rotating the coil (1).

The film (10) is fed to the exciting rolls (101) and (102), it is possible to finely and uniformly corrugated form, as described above. Roller (102) is driven steel roller, while the roller (101) is a rubber idler roller. Rollers (103) and (104) are driven toothed rollers, i.e. rollers with axial riffles, and teeth continue parallel to the axis and mutually engage during operation. (105) and (106) are exciting rollers, and (105) is driven steel roller and (106) is a rubber idler roller.

Between the rollers (102) and (103) creates a tension, which corresponds approximately to the limit of making the film residual elongation. The main residual elongation should normally be created by the engagement between the teeth on the rolls (103) and (104), but some additional residual elongation can be created tension between the roller 104 and roller (106).

1. A method of manufacturing a polymer film, a uniaxially oriented at an angle to its longitudinal direction in which the flat tubular film longitudinally oriented between the idler rollers and stabilize, and after orientation cut out the spiral first by unwinding from the reel (9) in the unwinding stand (5), which performs a rotary motion to rotate the flat sleeve around its longitudinal axis passing line, and then blow by pulling on the mandrel (16) and uniform feed screw movement, with each point on the surface of the film follows a spiral, and open carry a knife (18), located in a stationary position, and then cut in a spiral, remove the film from the mandrel, characterized in that the tensioning rollers (107-112, 101-106) installed in a rotatable unwinding stand to perform orientation as the phase between the unwinding and inflating a flat film, and stabilization carry out after cutting in a spiral.

2. The method according to claim 1, characterized in that the stabilization is performed in line with the reveal of the spiral.

3. The method according to claim 1 or 2, characterized in that the stabilization is performed by heating.

4. The method according to claim 3, characterized in that the stabilization is performed by passing the film S-shape through a series of closely spaced heated rolls.

5. SPO is about according to claim 4, characterized in that the film stretches in the new machine direction during transmission, preferably between 5 and 20%.

6. The method according to claim 1 or 2, characterized in that the stabilization is accomplished by the transverse tension between being in meshing corrugated rolls, the ribs are circular or spiral, preferably between corrugated rollers with sharp peaks riffles.

7. The method according to claim 1 or claim 2, characterized in that the tension in the unwinding stand perform between closely spaced smooth rollers, which the film passes S-shaped.

8. The method according to claim 1 or 2, characterized in that at least part of the tension in the unwinding stand perform between one or more pairs of rolls, provided with teeth, passing in the direction of the axis of the roll, and the teeth in each pair of rolls which engage with each other.

9. The method according to claim 1 or 2, characterized in that between the unwinding and stretching in the unwinding stand film supply corrugations throughout its length, and the size of each corrugation perform quite small and the distribution is fairly uniform corrugations, so that the shirring disappeared under tension.

10. The method according to claim 1 or 2, characterized in that 50 wt.% or more film consists of polyethylene HDPE, linear polyethylene LLDPE, or crystalline polypropylene (PP).

11. The device DL the execution of the method according to any one of claims 1 to 10, containing unwinding stand (1), which provides the ability to install coil (9) of the flat tubular film, and unwinding stand contains a rotatable unwinding device, which is made with the possibility of unwinding the flat tubular film and its rotation around its longitudinal axis passing line (23), the mandrel (14), means for opening the stretched film for the formation of the open sleeve and pulling open the sleeve over the mandrel with a spiral movement, the knife (18)located in a fixed position for cutting spirally open sleeves and a means for removing the cut in a spiral film from the mandrel, characterized in that it comprises a tension rolls (107-112, 101-106), mounted for rotation with a rotatable unwinding device for stretching a flat tubular film in the longitudinal direction after unwinding from the reel and before opening to pull on the mandrel, and the fact that it further comprises means for stabilizing designed to stabilize the orientation of the generated longitudinal stretch rolls, cut in a spiral film after removal from the mandrel.

12. The device according to claim 11, in which the stabilization device is provided in line with the knife.

13. The device according to claim 11 or 12, in which the means for stabilizing comprises at least one load, the th roller, preferably several heated rolls, made with the possibility of a S-shaped path for the cut in a spiral film.

14. The device according to item 13, in which the means of stabilising executed with a possibility of longitudinal stretching of the cut in a spiral film, preferably in an amount in the range from 5 to 20%.

15. The device according to claim 11 or 12, in which the means for stabilizing includes siteplease corrugated rolls having a circular or spiral pattern for the transverse tension cut in a spiral film, and corrugated rolls preferably have sharp peaks riffles.

16. The device according to claim 11 or 12, in which the rotary tensioning rollers include at least one pair of smooth rolls (107-112, 101-102, 105-106)made with the possibility of the S-shaped transmission flat film between them.

17. The device according to claim 11 or 12, in which the rotary tensioning rollers include at least one pair of rolls (103-104) with teeth having mutually siteplease grooves running parallel to the axis, between which a flat bag film is longitudinally stretched.

18. The device according to claim 11 or 12, in which the coil (9) of the flat tubular film is set in the unwinding stand, with its axis perpendicular to a longitudinal axis passing line (23) unwound flat tubular film, with the possibility of the ability of rotation thereby, that its axis rotates around mentioned centerline to act as a rotating unwinding device.

19. The device according to claim 11 or 12, in which the coil flat tubular film is set in the unwinding stand, with its axis fixed so that it is aligned with the longitudinal axial line passing unwound flat tubular film, while rotating unwinding device rotates around the coil, due to which the bag film is rotated.

20. The device according to claim 11 or 12, further containing shirring tool to ensure a passing longitudinally of the corrugations in the flat bag film located between the coil and rotatable longitudinal pull-up rolls.

21. The device according to claim 11 or 12, further containing means (13) air supply designed to supply air through the mandrel for inflating the sleeve film.

22. Device for cutting spiral flexible tubular polymeric film of a given diameter on a flat strip with an unwinding stand having a support means for mounting the coil tubular film in the flat, and unwinding device for unwinding the flat tubular film from the reel and unwinding the device is mounted can be rotated around an axis of rotation, which is a flat bag film ramaty is moved from the coil and fed to the elongation zone, with its longitudinal centerline aligned with a predetermined axis of rotation, and rotation about the aforementioned axis line, and the device further comprises a zone of extension tool for opening flat tubular film in film sleeve, essentially circular cross-section, the mandrel having an outer diameter less than the diameter tubular and coaxial with the said given axis of rotation, means for pulling the film sleeve over the mandrel with a spiral movement, the knife in a predetermined stationary position relative to the mandrel for cutting the film sleeve at a selected angle for education cut in a spiral flat film strip, and means for removing the cut in a spiral flat film strip from the mandrel, the device further comprises a tensioning rollers for longitudinal stretching of a flat film after its unwinding from the reel and before reaching the zone of expansion, and the tension rollers mounted on a rotatable unwinding device to rotate together with him around a given rotation axis, the device further comprises means for stabilizing designed to stabilize the orientation of the generated idler rolls, cut in a spiral flat film strip after removal from the mandrel.



 

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Roofing material // 2278876

FIELD: rubber industry and building materials.

SUBSTANCE: invention relates to production of roofing material used to manufacture soft roofs of buildings and constructions. Composition for production of roofing material contains waste of butadiene/styrene rubber coagulum and/or structured wastes from butadiene/styrene rubber production, or waste of butadiene/styrene rubber coagulum and structured wastes from butadiene rubber production, industrial oil waste, chalk, carbon black (P-234, P-514, P-803), and sulfur, all in specified proportions. Roofing material is obtained via preparing rubber composition by mixing subjected to heat treatment at 75-85°C for 10-12 days.

EFFECT: improved physicochemical and performance characteristics of material.

2 cl, 2 tbl, 11 ex

FIELD: process engineering.

SUBSTANCE: invention relates to production of films from superhigh-molecular polyolefin. Proposed method comprises affecting initial superhigh-molecular polyolefin with weighted mean molecular weight of, at leas 500000 g/mol in the form of compacted powder by isobaric press. Besides, compacted polyolefin of rolling stage is subjected to definite processing. Also, it is stretched at such conditions whereat polymer processing temperature does no up to magnitude exceeding its fusion point at no point whatsoever.

EFFECT: high-quality films from superhigh-molecular polyolefin.

15 cl, 2 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to production of oriented polymer strips and their use in production of reinforced tubes. Proposed method satisfied the requirement (V2-V1)/L>0,22 s-1. Elongation is performed at temperature approximating to fusion point by, at least, three independent-drive drawing rolls. Axes of rotation of said rolls are perpendicular to polymer film translation. Rolls revolve in one direction at different tangential speeds V1, V2 and V3. Third drawing roll revolves at speed V3 exceeding that of second roll V2.

EFFECT: hardened structural integrity, higher drawing speeds, ruling out of film slippage.

7 cl, 1 dwg

FIELD: technological processes.

SUBSTANCE: invention is related to device and method for manufacturing of film or fiber from reduced amount of polymer material. Invention is related to system of batch-off roll in device. Device comprises facility for melting and shaping of material composition in mold, facility for cooling of melted and molded material, facility for drawing of film or fiber, including the first and second drawing rolls. Device comprises facility for control of torsion torque in process of drawing to the minimum value of 1.5·10-3 Nm, in which rotation speed of every drawing roll with diametre from 35 to 100 mm may be established from 0.25 to 35 rpm. Speed of rotation is controlled by microstep method.

EFFECT: provision of possibility to use small-sized equipment, and also to use reduced amount of polymer material.

14 cl, 2 dwg, 3 ex

FIELD: mechanics.

SUBSTANCE: proposed device comprises one drive roller running at speed V1 and second drive roller running at speed V2. Note here that V1<V2 and rollers are arranged with a gap between them designed for stretching. The device intended for maintaining the sheet width clamps mechanically both film sheet edges areas. In stretching, the aforesaid gap width does not, in fact vary. Aforesaid device for maintaining the sheet width invariable comprises two pairs of supports. The proposed method of longitudinal film sheet stretching with the help of the above device consists in that the film is, first, directed over the low-speed roller, then, via the stretching gap to go over the high-speed roller. In stretching in the said stretching gap, both edges of the film are locked between the rollers of two pairs of supports. The proposed invention allows producing oriented film that features notable longitudinal shrinkage at increased temperature and does vary its crosswise sizes.

EFFECT: simple and efficient method.

31 cl, 14 dwg, 3 ex

FIELD: technological processes.

SUBSTANCE: invention is related to new, oriented morphologies and to special type of orientation in polymer alloy, and is used for film used for lamination with cross laying of layers, and for film used for manufacture of cord materials, materials from twisted or woven tape. Mixture of two partially incompatible polymers are extruded with provision of film provided that alloy in mixture contains fibrils that are mostly stretched in the same direction. At that width and thickness of every fibril is characterised by average value less than 5 mcm, at that fibrils are molded from polymer component that differs by higher melting temperature, and fibrils are surrounded by matrix of the second polymer, elasticity module of which is less. Special morphology is obtained by installation of grids in chamber with grids upstream outlet opening of extrusion nozzle, and afterwards hot stretching is realised at the temperature, when polymer with higher melt temperature is in at least partially crystalline condition, and by cold stretching, when both polymers are mostly in hard condition. The second stage of cold stretching is realised in conditions that result in relative extension at rupture at 20°C, which amounts to at least 25%.

EFFECT: possibility to produce film for laminates with cross laying of layers that are characterised by high resistance to impact loads.

97 cl, 24 dwg, 1 tbl, 1 ex

FIELD: chemical industry; methods of production of the nanoporous polymeric films with the open pores.

SUBSTANCE: the invention is pertaining to the field of production of the nanoporous polymeric films with the open pores. The films may be used in production of the porous polymeric membranes, the sorbents, the gas-permeable materials, molds for production of the nanocomposites, etc. the invention allows to increase by 10 times the porosity of the films at saving the nanometric dimension of the pores. The method of production of the nanoporous polymeric films with the open pores includes the stage of the single axis drawing in the contact with the adsorption-active medium. The subsequent stages include withdrawal of the adsorption-active medium from the films and the thermal treatment of the films, which are conducted in the conditions of keeping the films stretched in the direction of the drawing. At least, one of the stages of the method, such as the drawing, the withdrawal of the adsorption-active medium from the film and the thermal treatment of the film is exercised with the additional adjustment of the cross-sectional dimensions of the films.

EFFECT: the invention allows to increase by 10 times the porosity of the films at saving the nanometric dimension of the pores.

4 ex

The invention relates to a method for producing a multilayer polymeric material of high strength

The invention relates to a method and apparatus for stretching the laminate to a zero strain stretch, which is formed with a substantially unstressed conditions (t

The invention relates to a method and apparatus for consideration layered with zero deformation of the web, which is collected in a substantially unstrained condition that becomes elastic mechanical strain

The invention relates to a method and apparatus for stretching the laminate to a zero strain stretch, which is formed with a substantially unstressed conditions (t

FIELD: chemical industry; methods of production of the nanoporous polymeric films with the open pores.

SUBSTANCE: the invention is pertaining to the field of production of the nanoporous polymeric films with the open pores. The films may be used in production of the porous polymeric membranes, the sorbents, the gas-permeable materials, molds for production of the nanocomposites, etc. the invention allows to increase by 10 times the porosity of the films at saving the nanometric dimension of the pores. The method of production of the nanoporous polymeric films with the open pores includes the stage of the single axis drawing in the contact with the adsorption-active medium. The subsequent stages include withdrawal of the adsorption-active medium from the films and the thermal treatment of the films, which are conducted in the conditions of keeping the films stretched in the direction of the drawing. At least, one of the stages of the method, such as the drawing, the withdrawal of the adsorption-active medium from the film and the thermal treatment of the film is exercised with the additional adjustment of the cross-sectional dimensions of the films.

EFFECT: the invention allows to increase by 10 times the porosity of the films at saving the nanometric dimension of the pores.

4 ex

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