CN115837763B - Production process of tear-resistant PET release film - Google Patents
Production process of tear-resistant PET release film Download PDFInfo
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- CN115837763B CN115837763B CN202211270987.XA CN202211270987A CN115837763B CN 115837763 B CN115837763 B CN 115837763B CN 202211270987 A CN202211270987 A CN 202211270987A CN 115837763 B CN115837763 B CN 115837763B
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Abstract
The invention relates to a production process of a tear-resistant PET release film, which comprises the following steps: s1, extruding a polypropylene film by tape casting, pressing the polypropylene film with a transfer printing fabric with forward textures, and peeling to obtain a polypropylene film with reverse textures; s2, unreeling the PET sheet, coating UV glue, then laminating with the polypropylene film obtained in the step S1, carrying out UV illumination, and stripping to obtain the PET/UV glue sheet with positive texture; and S3, coating a release agent on the UV adhesive surface of the PET/UV adhesive sheet to form a second release layer, so as to obtain the PET release film. The invention can save the manufacturing cost of different engraving embossing rollers and the equipment adaptability during embossing transfer printing, can realize the manufacture of PET/UV adhesive sheets with different textures, and is labor-saving and simple; the invention adopts a casting extrusion mode to obtain the casting film, adopts 3-stage cooling, and combines the pressing operation on the surface of the release layer during embossing transfer printing, thereby jointly ensuring the texture fidelity of the polypropylene film transfer printing medium and realizing the convenient stripping of the polypropylene film and the PET.
Description
Technical Field
The invention relates to the technical field of release films, in particular to a production process of a tear-resistant PET release film.
Background
Synthetic leather is loved by consumers due to beautiful and changeable grain design, the formation of grains on the surface of the existing synthetic leather needs to use release paper, and long-fiber base paper is usually used as a base material of the release paper. The production of the synthetic leather requires repeated use of the release paper for 20-40 times due to the consideration of the process cost, but the defects of the paper base material include difficult complete removal, brittleness, easy tearing, solvent resistance, poor flatness, easy yellowing and the like, and the technical solution is difficult to obtain.
Therefore, a PET release film appears on the market, which comprises a PET film layer, an embossing layer and a release layer coated on the embossing layer, wherein the PET film layer, the embossing layer and the release layer are sequentially stacked, the embossing layer adopts a UV adhesive layer, and the release layer is convenient for peeling other functional layers on the transfer film and enabling the other functional layers to be attached to the surface of leather; the release film has good temperature resistance, can resist the high temperature of 140-155 ℃ in the production process of the synthetic leather, cannot curl, is not easy to be brittle, is not easy to tear and is yellowing-resistant, and can bear 80-100 times of repeated use.
However, the existing embossing operation of the PET release film generally adopts the following two methods:
the first is that the embossing roller is directly pressed on the UV adhesive layer, the embossing roller is also called as an engraving roller, different engraving rollers are needed to be provided for release films with different textures, and the manufacturing cost is very high.
Secondly, a transfer medium with corresponding texture is prefabricated firstly, and then the transfer medium with corresponding texture is taken to be pressed with the UV adhesive layer on the PET, and the method comprises the following steps: firstly coating tackifying resin on the surface of a transfer medium film, then coating polyurethane resin, then embossing the surface of the polyurethane resin by adopting an engraving roller, finally coating a layer of release agent on the surface of the polyurethane resin after embossing, and pressing the prepared transfer medium with texture with a UV (ultraviolet) glue layer on PET (polyethylene terephthalate). Therefore, the embossing roller is also used for embossing, the cost is high, on the other hand, the upper side and the lower side of the embossing layer are respectively coated to form the tackifying layer and the release layer, so that the embossing layer and the UV glue layer can be conveniently stripped after being embossed, and the coating of the release layer enables the texture on the embossing layer to be irregularly filled or buried by the release agent, so that the texture fidelity of the embossing layer on the transfer medium is reduced, and the texture of the UV glue layer is distorted.
Disclosure of Invention
The invention aims to provide a production process of a tear-resistant PET release film, which can be used for preparing the PET release film with high grain fidelity without using a carving roller.
In order to achieve the purpose, the invention adopts the technical scheme that:
a production process of a tear-resistant PET release film specifically comprises the following steps:
s1, extruding a polypropylene film by tape casting, pressing the polypropylene film with a transfer printing fabric with forward textures, and peeling to obtain a polypropylene film with reverse textures; the transfer printing fabric is a textile fabric which is circulated in the market and has texture or jacquard weave on the surface.
S2, unreeling the PET sheet, coating UV glue, then laminating the PET sheet with the polypropylene film with the reverse texture in the step S1, then curing the UV glue on the PET sheet through UV illumination, enabling the surface of the UV glue to have the forward texture, and then stripping the polypropylene film with the reverse texture to obtain the PET/UV glue sheet with the forward texture;
and S3, coating a release agent on the UV adhesive surface of the PET/UV adhesive sheet with the positive texture in the step S2 to form a second release layer, so as to obtain the PET release film.
Preferably, the specific process in step S1 is: and (2) putting polypropylene slices into a screw extruder, extruding after melting and plasticizing, cooling to 5 ℃ before and after the softening point of polypropylene through a front passage, then rolling and coating a release agent on one side of the polypropylene film which is pressed with the transfer printing fabric, then pressing the polypropylene film with a release layer and the transfer printing fabric with the forward texture between a rear cooling roller and a rear compression roller, transferring the forward texture on the transfer printing fabric to the surface of the side of the polypropylene film which is rolled and coated with the release agent, and finally separating and rolling to obtain the polypropylene film with the reverse texture.
Preferably, the thickness of the release agent roll coating in the step S1 is 0.5 to 1.5 micrometers.
Preferably, the front cooling adopts a cooling roller and/or an air cooling mode.
Preferably, the step S1 is performed by thermal curing after the release agent is coated by rolling to form the first release layer.
Preferably, the polypropylene film with the release layer of step S1 is sequentially subjected to a first post cooling, a pressing with a transfer fabric, and a second post cooling on a post cooling roller.
Preferably, the UV light irradiation of the step S2 is performed on one side of the PET sheet.
Preferably, the thickness of the UV glue of the step S2 is 20-50 microns.
Preferably, the thickness of the second release layer in the step S3 is 0.5 to 1 micron.
Compared with the prior art, the invention has the following beneficial effects:
according to the PET release film, the engraving embossing roller is not used in the operation of obtaining the texture by UV adhesive lamination, the polypropylene film with the reverse texture is used as a transfer printing medium, the manufacturing cost of different engraving embossing rollers can be saved, the equipment adaptability during embossing and transfer printing is improved, the PET/UV adhesive sheets with different textures can be manufactured by only replacing different transfer printing media on the unreeling mechanism, the labor is saved, the convenience is realized, and the engraving embossing rollers are not required to be installed and replaced.
The polypropylene film with reverse texture of the invention adopts a casting extrusion mode to obtain a casting film and adopts 3-stage cooling: the front cooling, the first back cooling and the second back cooling are carried out, pressing operation is carried out on the surface of the release layer when embossing transfer printing is combined, the texture fidelity of a polypropylene film transfer printing medium is jointly guaranteed, the polypropylene film and PET are conveniently peeled off, an adhesion increasing layer does not need to be arranged between the PET sheet and the UV adhesive layer, and the cost is further reduced.
Wherein: the polypropylene film surface coating solidification after the cooling of the front is formed first from the type layer, improves first from the type layer and polypropylene film bonding force, is convenient for peel off the rendition fabric that has forward texture smoothly, guarantees can not cause to tear to draw the fidelity that warp and improve reverse texture to the reverse texture that forms on the polypropylene film that has from the type layer in the peeling process.
The polypropylene film stripped from the transfer fabric is finally cooled through the second subsequent cooling to shape reverse textures on the polypropylene film, the polypropylene film solidified by the release agent is subjected to secondary cooling through the first subsequent cooling to further reduce the temperature of the polypropylene film, so that the texture plasticity of the polypropylene film and the transfer fabric after lamination is ensured, the phenomenon that the reverse textures on the surface of the polypropylene film are damaged during separation due to the fact that the polypropylene film permeates into the inner holes of the transfer fabric in the lamination process can be avoided, meanwhile, embossing is carried out on the polypropylene film from the surface of the first release layer, the distortion influence of the thickness of the first release layer on the textures can be avoided, and the fidelity is improved.
After the functional layer and the back adhesive layer are arranged on the surface of the PET release film, the PET release film can be applied to the surface of articles such as leather, textile, acrylic plastic, glass, metal and the like through transfer printing. Meanwhile, the transfer printing fabric adopted by the invention has wide sources and low acquisition cost.
Drawings
FIG. 1 is a schematic view of a casting machine set according to the present invention.
FIG. 2 is a schematic view of a subsequent cooling roll and a subsequent press roll of the present invention.
The labels in the figure are: 11. a screw extruder; 12. a front cooling roll; 13. a release coating and curing mechanism; 14. a subsequent cooling roller; 15. a back-end press roll; 16. a PP winding mechanism; 17. a fabric unwinding roller; 18. and (7) a fabric winding roller.
Detailed Description
Example 1
The embodiment provides a production process of a tear-resistant PET release film, which specifically comprises the following steps:
s1, adding polypropylene slices into a screw extruder 11, extruding after melt plasticizing, cooling to 5 ℃ below the softening point of polypropylene through a front path, then rolling and coating a release agent on one side of the polypropylene film, which is in press fit with a transfer fabric, then pressing and fitting the polypropylene film with a release layer and the transfer fabric with forward textures between a rear cooling roller 14 and a rear pressing roller 15, transferring the forward textures on the transfer fabric to the surface of one side, which is coated with the release agent, of the polypropylene film and curing to form a first release layer, drying and curing the release agent by adopting a Sly-Off release thermosetting agent to form the first release layer by adopting hot air curing, wherein the rolling and coating thickness of the first release layer is 1 micron, and finally separating and rolling to obtain the polypropylene film with reverse textures.
S2, unreeling the PET sheet, controlling the speed to be 12m/min, conveying the PET sheet to a UV glue coating area through a plurality of guide rollers, coating UV glue on one side of the PET sheet in the UV glue coating area, wherein the UV glue adopts MPB photosensitive adhesive and is 40 microns in roll coating thickness, laminating the PET sheet coated with the UV glue and the polypropylene film with the reverse texture in the step S1, keeping the laminated state, feeding the PET sheet into a UV irradiation box, irradiating the back glue side of the PET sheet with an ultraviolet light source with the wavelength of 390nm and the intensity of 10500mW/cm & lt 2 & gt by using UV light to enable the UV glue to be solidified on the PET sheet and enable the surface of the UV glue to have the forward texture, and then stripping the polypropylene film with the reverse texture to obtain the PET/UV glue sheet with the forward texture.
And S3, coating a release agent on the UV adhesive surface of the PET/UV adhesive sheet with the positive texture in the step S2 to form a second release layer with the thickness of 0.5 micrometer, and thus obtaining the PET release film.
Example 2
The embodiment provides a production process of a tear-resistant PET release film, which specifically comprises the following steps:
s1, adding polypropylene slices into a screw extruder 11, extruding after melting and plasticizing, rolling and coating a release agent on one side of a polypropylene film which is pressed with a transfer printing fabric after cooling to a polypropylene softening point through a front path, then pressing and coating the polypropylene film with the release layer and the transfer printing fabric with forward textures between a cooling roller 14 and a compression roller 15 of a back path, transferring the forward textures on the transfer printing fabric to the surface of one side of the polypropylene film which is rolled and coated with the release agent and curing to form a first release layer, drying and curing the release agent by adopting Sly-Off heat curing release agent to form the first release layer by adopting hot air curing, wherein the rolling and coating thickness of the first release layer is 1.2 microns, and finally separating and rolling to obtain the polypropylene film with reverse textures.
S2, unreeling the PET sheet, controlling the speed at 15m/min, conveying the PET sheet to a UV gluing area through a plurality of guide rollers, coating UV glue on one side of the PET sheet in the UV gluing area, enabling the UV glue to be in rolling coating thickness of 30 microns, pressing the coated UV glue with the polypropylene film with the reverse texture in the step S1, keeping the pressing state, entering a UV irradiation box, irradiating the back glue side of the PET sheet with an ultraviolet light source with the wavelength of 390nm and the intensity of 10600mW/cm & lt 2 & gt to enable the UV glue to be solidified on the PET sheet and enable the surface of the UV glue to have the forward texture, and then stripping the polypropylene film with the reverse texture to obtain the PET/UV glue sheet with the forward texture.
And S3, coating a release agent on the UV adhesive surface of the PET/UV adhesive sheet with the positive texture in the step S2 to form a second release layer with the thickness of 0.8 micrometer, and thus obtaining the PET release film.
Step S1 of the above embodiments 1 and 2 is performed in a casting molding machine set, and as shown in fig. 1-2, the casting molding machine set includes a screw extruder 11, a front cooling roller 12, a front press roller, a rear cooling roller 14, a rear press roller 15, a release coating and curing mechanism 13, a PP winding mechanism 16, a fabric unwinding roller 17, and a fabric winding roller 18.
Wherein: the front cooling roll 12 and the front compression roller horizontally rotate and are arranged side by side, a roll gap between the front cooling roll 12 and the front compression roller is used for conveying a cast extruded polypropylene film and carrying out front cooling treatment on the polypropylene film, so that the temperature of the polypropylene film is reduced to 5 ℃ before and after the softening point of the polypropylene film, the subsequent first release layer and polypropylene film combination strength is improved, the stripping strength between the polypropylene film and the first release layer is greater than that between the first release layer and the transfer fabric, and the transfer fabric can be smoothly stripped. It is noted that in other examples, air cooling is further combined, namely, the polypropylene film is cooled by air blowing before entering the front cooling roller.
The release coating and curing mechanism 13 is arranged on a polypropylene film conveying path between the front cooling roller 12 and the rear cooling roller 14, the release agent is coated on the surface of the polypropylene film after the front cooling and is cured to form a first release layer through the release coating and curing mechanism 13, and the first release layer and the polypropylene film have good bonding force.
The back cooling roller 14 rotates with back compression roller 15 level and sets up side by side, the roll gap between back cooling roller 14 and the back compression roller 15 is used for the pressfitting conveying to have the polypropylene film from the type layer and has the rendition fabric of forward texture, control pressure makes the forward texture on the rendition fabric shift to the polypropylene film scribble a side surface of release agent, simultaneously because the polypropylene film surface is formed with first from the type layer, be convenient for peel off smoothly the rendition fabric that has forward texture, guarantee can not lead to the fact to tear to draw the fidelity that warp and improve reverse texture to the reverse texture that forms on the polypropylene film that has from the type layer at the stripping process.
In this embodiment, the pressing position a between the subsequent cooling roller 14 and the subsequent pressing roller 15 is on the central connecting line between the subsequent cooling roller 14 and the subsequent pressing roller 15, the input position M of the subsequent cooling roller 14 is above the pressing position a, and the output position N of the subsequent cooling roller 14 is below the pressing position a, that is, a first subsequent cooling zone and a second subsequent cooling zone are respectively arranged in front of and behind the pressing position a as a boundary point of the bonding zone on the subsequent cooling roller 14 to which the polypropylene film is bonded, the first subsequent cooling zone is a zone between the input position M and the pressing position a, the second subsequent cooling zone is a zone between the pressing position a and the output position N, the radian of the second subsequent cooling zone is greater than that of the first subsequent cooling zone, preferably, the sum of the radians of the second subsequent cooling zone and the first subsequent cooling zone is 170 to 190 °, and the ratio of the radians of the second subsequent cooling zone to the first subsequent cooling zone is 2 to 2.6: 1.
The polypropylene film with the release layer of the embodiment is sequentially subjected to first post cooling on the post cooling roller 14, is pressed with the transfer fabric and is subjected to second post cooling, the polypropylene film stripped from the transfer fabric is finally cooled through the second post cooling area to set reverse textures on the polypropylene film, the polypropylene film solidified by the release agent is subjected to re-cooling through the first post cooling area to further reduce the temperature of the polypropylene film, so that the texture plasticity of the polypropylene film and the transfer fabric after being pressed is ensured, the phenomenon that the reverse textures on the surface of the polypropylene film are damaged when the polypropylene film is separated due to the fact that the polypropylene film permeates into inner pores of the transfer fabric in the pressing process can be avoided, meanwhile, embossing is carried out from the surface of the first release layer to the polypropylene film, the distortion influence of the thickness of the first release layer on the textures can be avoided, and the fidelity is improved.
A first guide roller set is arranged between the rear cooling roller 14 and the release coating and curing mechanism 13, a second guide roller set is arranged between the rear cooling roller 14 and the PP winding mechanism 16, and a third guide roller set is arranged between the fabric unwinding roller 17 and the fabric winding roller 18 and the rear pressing roller 15 respectively.
The steps S2 and S3 of the above embodiments 1 and 2 are performed in the glue transfer printing device, and the glue transfer printing device includes a PET unwinding mechanism, a PP unwinding mechanism, a UV glue spreading mechanism, a UV irradiation box, a release coating and curing line, a PET winding mechanism, and a PP winding mechanism. Coating UV glue on one side of the PET sheet by a UV glue coating mechanism, carrying out ultraviolet irradiation on the PET sheet, the UV glue and the polypropylene film with reverse textures which are pressed together by a UV irradiation box, coating a release agent on the UV glue surface of the PET/UV glue sheet with the forward textures by a release coating and a curing line, and curing to form a second release layer.
While there have been shown and described what are at present considered to be the fundamental and essential features of the invention and advantages thereof, it will be understood by those skilled in the art that the invention is not limited by the foregoing embodiments, but is described in the foregoing description only for the purpose of illustrating the principles of the invention and is subject to various changes and modifications without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.
Claims (9)
1. A production process of a tear-resistant PET release film is characterized by comprising the following steps:
s1, extruding a polypropylene film by tape casting, pressing the polypropylene film with a transfer printing fabric with forward textures, and peeling to obtain a polypropylene film with reverse textures;
s2, unreeling the PET sheet, coating UV glue, then laminating the PET sheet with the polypropylene film with the reverse texture in the step S1, then curing the UV glue on the PET sheet through UV illumination, enabling the surface of the UV glue to have the forward texture, and then stripping the polypropylene film with the reverse texture to obtain the PET/UV glue sheet with the forward texture;
and S3, coating a release agent on the UV adhesive surface of the PET/UV adhesive sheet with the positive texture in the step S2 to form a second release layer, so as to obtain the PET release film.
2. The production process of the tear-resistant PET release film according to claim 1, characterized in that: the specific process of the step S1 comprises the following steps: and (2) putting polypropylene slices into a screw extruder, extruding after melting and plasticizing, cooling to 5 ℃ before and after the softening point of polypropylene through a front passage, then rolling and coating a release agent on one side of the polypropylene film which is pressed with the transfer printing fabric, then pressing the polypropylene film with a release layer and the transfer printing fabric with the forward texture between a rear cooling roller and a rear compression roller, transferring the forward texture on the transfer printing fabric to the surface of the side of the polypropylene film which is rolled and coated with the release agent, and finally separating and rolling to obtain the polypropylene film with the reverse texture.
3. The production process of the tear-resistant PET release film according to claim 2, characterized in that: the thickness of the release agent roll coating in the step S1 is 0.5-1.5 micrometers.
4. The production process of the tear-resistant PET release film according to claim 2, characterized in that: the front cooling adopts a cooling roller and/or an air cooling mode.
5. The production process of the tear-resistant PET release film according to claim 2, characterized in that: and in the step S1, a first release layer is formed by thermal curing after a release agent is coated in a rolling way.
6. The production process of the tear-resistant PET release film according to claim 2 or 5, characterized in that: and the polypropylene film with the release layer in the step S1 is sequentially subjected to first post cooling, pressing with the transfer fabric and second post cooling on a post cooling roller.
7. The production process of the tear-resistant PET release film according to claim 1, characterized in that: the UV light of step S2 is irradiated on one side of the PET sheet.
8. The production process of the tear-resistant PET release film according to claim 1, characterized in that: the thickness of the UV glue in the step S2 is 20-50 microns.
9. The production process of the tear-resistant PET release film according to claim 1, characterized in that: the thickness of the second release layer in the step S3 is 0.5-1 micron.
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| CN202211270987.XA CN115837763B (en) | 2022-10-18 | 2022-10-18 | Production process of tear-resistant PET release film |
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| CN202211270987.XA CN115837763B (en) | 2022-10-18 | 2022-10-18 | Production process of tear-resistant PET release film |
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| CN115837763A (en) | 2023-03-24 |
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