CN112900142A - Preparation method of mirror release paper for leather - Google Patents
Preparation method of mirror release paper for leather Download PDFInfo
- Publication number
- CN112900142A CN112900142A CN202011629210.9A CN202011629210A CN112900142A CN 112900142 A CN112900142 A CN 112900142A CN 202011629210 A CN202011629210 A CN 202011629210A CN 112900142 A CN112900142 A CN 112900142A
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- mirror
- roller
- film
- release paper
- laminating
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- 239000010985 leather Substances 0.000 title claims abstract description 40
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 238000010030 laminating Methods 0.000 claims abstract description 78
- 239000000463 material Substances 0.000 claims abstract description 52
- 238000005507 spraying Methods 0.000 claims abstract description 45
- -1 polypropylene Polymers 0.000 claims abstract description 31
- 238000003825 pressing Methods 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 23
- 239000004698 Polyethylene Substances 0.000 claims abstract description 17
- 229920000573 polyethylene Polymers 0.000 claims abstract description 17
- 239000004743 Polypropylene Substances 0.000 claims abstract description 14
- 229920001155 polypropylene Polymers 0.000 claims abstract description 14
- 239000007888 film coating Substances 0.000 claims description 27
- 238000009501 film coating Methods 0.000 claims description 27
- 239000002649 leather substitute Substances 0.000 abstract description 15
- 229920005989 resin Polymers 0.000 abstract description 9
- 239000011347 resin Substances 0.000 abstract description 9
- 230000002708 enhancing effect Effects 0.000 abstract description 6
- 239000010410 layer Substances 0.000 description 17
- 238000000227 grinding Methods 0.000 description 8
- 238000012360 testing method Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 230000002087 whitening effect Effects 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 3
- 239000011651 chromium Substances 0.000 description 3
- 238000005491 wire drawing Methods 0.000 description 3
- 239000011247 coating layer Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000006748 scratching Methods 0.000 description 2
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229920003180 amino resin Polymers 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 229920006122 polyamide resin Polymers 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000002393 scratching effect Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
- D21H23/46—Pouring or allowing the fluid to flow in a continuous stream on to the surface, the entire stream being carried away by the paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/10—Coatings without pigments
- D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
- D21H19/20—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H19/22—Polyalkenes, e.g. polystyrene
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
- D21H25/04—Physical treatment, e.g. heating, irradiating
- D21H25/06—Physical treatment, e.g. heating, irradiating of impregnated or coated paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
- D21H25/08—Rearranging applied substances, e.g. metering, smoothing; Removing excess material
- D21H25/12—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with an essentially cylindrical body, e.g. roll or rod
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/001—Release paper
Abstract
The invention discloses a preparation method of mirror release paper for leather, which comprises the following steps: placing the base paper between the mirror roller and the auxiliary roller, spraying the film spraying material between the mirror roller and the base paper through the film spraying head, and applying pressure to the base paper sprayed with the film spraying material through the mirror roller so as to form a film spraying material layer with a smooth surface on the surface of the base paper, thereby obtaining the mirror surface release paper. According to the invention, by matching the mirror roller, the laminating material and the preparation process, the polypropylene is used for enhancing the hardness of the resin, the polyethylene is used for enhancing the adhesion degree and the elasticity, and the polyethylene and the mirror roller are properly matched, so that the surface of the release paper is proper in hardness and has certain elasticity, paper curling of the release paper and generation of a yarn marking trace on the paper surface in the use process of the release paper are avoided, and the quality stability of the synthetic leather is ensured.
Description
Technical Field
The invention relates to the technical field of release paper production processes, in particular to a preparation method of mirror release paper for leather.
Background
The release paper is a kind of coated paper, usually composed of a paper base layer and a release coating layer, and the surface of the coating layer has a concave-convex pattern structure, but the surface of the mirror surface release paper has a smooth requirement.
Leather can be divided into genuine leather, regenerated leather and synthetic leather according to different manufacturing modes, because the genuine leather has scarce resources and high price, along with the rapid improvement and improvement of leather production and processing technology, the production technology of the synthetic leather is more and more mature, the performance is more and more good, and the synthetic leather is more and more applied in daily life, so that the synthetic leather is generally used for manufacturing various leather products or replacing part of genuine leather materials. Synthetic leather is produced by a method comprising applying a synthetic leather composition such as urethane resin, vinyl chloride resin, polyamide resin, amino resin or the like on a leather release paper, drying or curing the composition, applying an adhesive to the composition, attaching a fabric base or the like, and peeling the leather release paper from the synthetic leather composition. The synthetic leather manufactured by the method obtains high-gloss synthetic leather by improving the surface gloss of the leather release paper, and aims to transfer the surface state of the leather release paper to the synthetic leather.
At present, the problems of paper curling and wire drawing are easy to occur in the use process of mirror surface release paper on the market, and the phenomena of whitening and insufficient transparency can occur on the mirror surface of leather after the leather coated with the mirror surface release paper passes through an oven, so that the quality stability of the synthetic leather can not be ensured.
Disclosure of Invention
In order to overcome the defects of the prior art, one of the purposes of the invention is to provide a preparation method of mirror surface release paper for leather, the obtained release paper has no paper curling and wire drawing problems in the use process, and the mirror surface of the leather coated with the mirror surface release paper has no whitening and insufficient transparency after passing through an oven, so that the quality stability of the synthetic leather is ensured.
The invention is realized by adopting the following technical scheme:
a preparation method of mirror release paper for leather comprises the following steps:
s1: providing base paper, a film laminating material and a film laminating machine, wherein the film laminating machine comprises a mirror roller with a smooth surface, an auxiliary roller contacted with the surface of the mirror roller and a film laminating head positioned at the upper end of the mirror roller; the laminating material comprises the following components in parts by weight: 58-62 parts of polypropylene and 38-42 parts of polyethylene;
s2: placing the base paper between the mirror roller and the auxiliary roller, spraying the film spraying material between the mirror roller and the base paper through the film spraying head, and applying pressure to the base paper sprayed with the film spraying material through the mirror roller so as to form a film spraying material layer with a smooth surface on the surface of the base paper, thereby obtaining the mirror surface release paper.
Further, the mass ratio of the polypropylene to the polyethylene is 3: 2.
further, the quality index requirements of the mirror roller are as follows: the surface hardness is HRc60-HRc70, the balance degree is G40 grade, the smoothness is Ra0.02-Ra0.006, and the roughness is Ra0.8-Ra1.0.
Further, the temperature of the mirror roller is 5-10 ℃.
Further, the pressing speed of the mirror roller is 10r/min-15 r/min.
Further, the pressing force of the mirror roller is 1N-3N.
Further, the temperature of the film spraying head is 260-300 ℃.
Further, the distance between the laminating head and the mirror roller is 350-450 mm.
Further, the film spraying speed of the film spraying machine is 15-20 m/min. With faster membrane speed of drenching for the contact time of resin and mirror roller is shorter, avoids resin and mirror roller of high temperature to produce the reaction, leads to mirror roller to fog, makes the obtained phenomenon that appears blushing from type paper. And the cooling temperature of the mirror roller is matched, so that the resin can be rapidly cooled and solidified.
Further, the laminating amount of the laminating film layer is 1.2-1.8g/m2。
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, by matching the mirror roller, the laminating material and the preparation process, the polypropylene is used for enhancing the hardness of the resin, the polyethylene is used for enhancing the adhesion degree and the elasticity, and the polyethylene and the mirror roller are properly matched, so that the surface of the release paper is proper in hardness and has certain elasticity, paper curling of the release paper and generation of a yarn marking trace on the paper surface in the use process of the release paper are avoided, and the quality stability of the synthetic leather is ensured.
The mirror roller and the film coating material are matched with the film coating speed and the cooling temperature of the mirror roller, so that the resin can be rapidly cooled and solidified, and the phenomenon that the obtained release paper is whitened is avoided.
Drawings
Fig. 1 is a schematic view of the positional relationship among the mirror surface roller, the laminating head and the auxiliary roller in the method for preparing the mirror surface release paper for leather of the present invention.
In the figure: 10. base paper; 20. a mirror surface roller; 30. a membrane spraying head; 40. and (5) auxiliary rollers.
Detailed Description
The present invention is further described below with reference to specific embodiments, and it should be noted that, without conflict, any combination between the embodiments or technical features described below may form a new embodiment.
The invention provides a preparation method of mirror release paper for leather, which comprises the following steps:
s1: providing a base paper 10, a film laminating material and a film laminating machine, wherein the film laminating machine comprises a mirror roller 20 with a smooth surface, an auxiliary roller 40 contacted with the surface of the mirror roller 20 and a film laminating head 30 positioned at the upper end of the mirror roller 20, as shown in fig. 1; the laminating material comprises the following components in parts by weight: 58-62 parts of polypropylene and 38-42 parts of polyethylene;
s2: placing the base paper 10 between the mirror surface roller 20 and the auxiliary roller 40, spraying the film spraying material between the mirror surface roller 20 and the base paper 10 through the film spraying head 30, and applying pressure to the base paper 10 sprayed with the film spraying material through the mirror surface roller 20 to form a film spraying material layer with a smooth surface on the surface of the base paper 10, so as to obtain the mirror surface release paper.
The quality index requirements of the mirror roller 20 are as follows: the surface hardness is HRc60-HRc70, the balance degree is G40 grade, the smoothness is Ra0.02-Ra0.006, and the roughness is Ra0.8-Ra1.0.
The mirror roller 20 is prepared by the following preparation method:
1) turning an inner pipe, wherein the size of the inner pipe is 0.4mm in interference with the outer pipe, the fillet of the two plates is 15 x 30 degrees, polishing the inner pipe, removing slag, checking whether the size of the inner pipe is matched with the size of the inner diameter of the outer pipe, sleeving the inner pipe in place, and after cooling and shrinking, integrally assembling and welding;
2) annealing heat treatment, process tempering, multiple stress relief, rough turning and allowance reservation, static balance is conducted, the borrowing deviation is calculated and the vehicle is borrowed on a lathe;
3) quenching, wherein the surface hardness requires HRC 60-70 degrees, the roll surface has no cracks, top pinholes are repaired at two shaft heads, the two shaft heads jump to the roll surface to be less than 0.05, the length is processed to the size according to the requirement of a drawing, and the allowance is set at the excircle to be 0.5-0.6;
4) grinding a first supporting circle to form a bracket position, grinding the size of a roll surface according to the requirement of a drawing, enabling Ra0.5 two shaft heads to jump to the roll surface to be less than 0.02, trimming top pinholes on the two shaft heads, enabling the two shaft heads to jump to the roll surface to be less than 0.05, processing the roll surface to the size according to the requirement of the drawing, and placing allowance on an excircle to be 0.5-0.6;
5) grinding a second support circle to form a bracket position, and according to the size of the surface of the grinding roller required by the drawing, enabling Ra0.5 two axial heads to jump to the surface of the grinding roller by less than 0.02;
6) performing dynamic balance G40 grade, plugging the air holes, performing a pressure experiment without leakage, and performing a water pressure unblocked experiment;
7) electroplating hard chromium, wherein the single-side 0.15 chromium layer is uniform without pinholes, and has the defects of falling off and the like, and the two shaft heads are finely ground, and the two bearings stop the roll surface jumping to be less than 0.01 and the roughness to be 0.8; grinding the surface of the roller by using a disc grinder when the rest shaft heads are ground to the tolerance range, and checking the surface of the roller, wherein the quality of the roller is free, needle-hole, fly renting and the like; the roller surface reaches Ra0.01-0.005 (the smoothness reaches 15 grades) to form a super mirror surface, and the hardness HRC62 degrees is obtained after chromium plating and polishing.
In another embodiment, the mass ratio of polypropylene to polyethylene is 3: 2; the temperature of the mirror roller 20 is 5-10 ℃; the pressing speed of the mirror roller 20 is 10r/min-15 r/min; the pressing force of the mirror roller 20 is 1N-3N; the temperature of the drenching film head 30 is 260-3 DEG C00 ℃; the distance between the laminating head 30 and the mirror surface roller 20 is 350mm-450 mm; the film coating speed of the film coating machine is 15-20 m/min; the laminating amount of the laminating film layer is 1.2-1.8g/m2。
According to the preparation method, the mirror roller 20, the laminating material and the preparation process are matched, the polypropylene is used for enhancing the hardness of the resin, the polyethylene is used for enhancing the adhesion degree and the elasticity, and the polyethylene and the mirror roller are properly matched, so that the surface of the release paper is proper in hardness and has certain elasticity, paper curling of the release paper and generation of scratching marks on the paper surface in the use process of the release paper are avoided, and the quality stability of the synthetic leather is ensured.
According to the invention, the mirror roller 20 and the film coating material are matched with the film coating speed and the cooling temperature of the mirror roller 20, so that the resin can be rapidly cooled and solidified, and the phenomenon that the obtained release paper is whitened is avoided.
The following are specific examples of the present invention, and raw materials, equipment, and the like used in the following examples can be obtained by purchasing, unless otherwise specified.
Example 1
A preparation method of mirror release paper for leather comprises the following steps:
s1: providing a base paper 10, a film laminating material and a film laminating machine, wherein the film laminating machine comprises a mirror roller 20 with a smooth surface, an auxiliary roller 40 contacted with the surface of the mirror roller 20 and a film laminating head 30 positioned at the upper end of the mirror roller 20; the laminating material comprises the following components in parts by weight: 60 parts of polypropylene and 40 parts of polyethylene; the quality index requirements of the mirror roller 20 are as follows: the surface hardness is HRc60-HRc70, the balance degree is G40 grade, the smoothness is Ra0.02-Ra0.006, and the roughness is Ra0.8-Ra1.0;
s2: placing the base paper 10 between the mirror surface roller 20 and the auxiliary roller 40, spraying the film spraying material between the mirror surface roller 20 and the base paper 10 through the film spraying head 30, and applying pressure to the base paper 10 sprayed with the film spraying material through the mirror surface roller 20 to form a film spraying material layer with a smooth surface on the surface of the base paper 10, so as to obtain the mirror surface release paper; wherein the temperature of the mirror roller 20 is 5-10 ℃; of the mirror roller 20The pressing speed is 10r/min-15 r/min; the pressing force of the mirror roller 20 is 1N-3N; the temperature of the drenching film head 30 is 260-300 ℃; the distance between the laminating head 30 and the mirror surface roller 20 is 350mm-450 mm; the film coating speed of the film coating machine is 15-20 m/min; the laminating amount of the laminating film layer is 1.2-1.8g/m2。
Example 2
A preparation method of mirror release paper for leather comprises the following steps:
s1: providing a base paper 10, a film laminating material and a film laminating machine, wherein the film laminating machine comprises a mirror roller 20 with a smooth surface, an auxiliary roller 40 contacted with the surface of the mirror roller 20 and a film laminating head 30 positioned at the upper end of the mirror roller 20;the laminating material bag The composition comprises the following components in parts by weight: 58 parts of polypropylene and 38 parts of polyethylene;the quality index requirements of the mirror roller 20 are as follows: the surface hardness is HRc60-HRc70, the balance degree is G40 grade, the smoothness is Ra0.02-Ra0.006, and the roughness is Ra0.8-Ra1.0;
s2: placing the base paper 10 between the mirror surface roller 20 and the auxiliary roller 40, spraying the film spraying material between the mirror surface roller 20 and the base paper 10 through the film spraying head 30, and applying pressure to the base paper 10 sprayed with the film spraying material through the mirror surface roller 20 to form a film spraying material layer with a smooth surface on the surface of the base paper 10, so as to obtain the mirror surface release paper; wherein the temperature of the mirror roller 20 is 5-10 ℃; the pressing speed of the mirror roller 20 is 10r/min-15 r/min; the pressing force of the mirror roller 20 is 1N-3N; the temperature of the drenching film head 30 is 260-300 ℃; the distance between the laminating head 30 and the mirror surface roller 20 is 350mm-450 mm; the film coating speed of the film coating machine is 15-20 m/min; the laminating amount of the laminating film layer is 1.2-1.8g/m2。
Example 3
A preparation method of mirror release paper for leather comprises the following steps:
s1: providing a base paper 10, a film laminating material and a film laminating machine, wherein the film laminating machine comprises a mirror roller 20 with a smooth surface, an auxiliary roller 40 contacted with the surface of the mirror roller 20 and a film laminating head 30 positioned at the upper end of the mirror roller 20;the laminating filmMaterial bag The composition comprises the following components in parts by weight: 62 parts of polypropylene and 42 parts of polyethylene;the quality index requirements of the mirror roller 20 are as follows: the surface hardness is HRc60-HRc70, the balance degree is G40 grade, the smoothness is Ra0.02-Ra0.006, and the roughness is Ra0.8-Ra1.0;
s2: placing the base paper 10 between the mirror surface roller 20 and the auxiliary roller 40, spraying the film spraying material between the mirror surface roller 20 and the base paper 10 through the film spraying head 30, and applying pressure to the base paper 10 sprayed with the film spraying material through the mirror surface roller 20 to form a film spraying material layer with a smooth surface on the surface of the base paper 10, so as to obtain the mirror surface release paper; wherein the temperature of the mirror roller 20 is 5-10 ℃; the pressing speed of the mirror roller 20 is 10r/min-15 r/min; the pressing force of the mirror roller 20 is 1N-3N; the temperature of the drenching film head 30 is 260-300 ℃; the distance between the laminating head 30 and the mirror surface roller 20 is 350mm-450 mm; the film coating speed of the film coating machine is 15-20 m/min; the laminating amount of the laminating film layer is 1.2-1.8g/m2。
In the above embodiments, the component parts of each material are not limited to the above parts, and the component parts of each material may also be a combination of other component parts described in the present invention, which is not described herein again.
Comparative example 1
A preparation method of mirror release paper for leather comprises the following steps:
s1: providing a base paper 10, a film laminating material and a film laminating machine, wherein the film laminating machine comprises a mirror roller 20 with a smooth surface, an auxiliary roller 40 contacted with the surface of the mirror roller 20 and a film laminating head 30 positioned at the upper end of the mirror roller 20;the laminating material bag The composition comprises the following components in parts by weight: 100 parts of polypropylene;the quality index requirements of the mirror roller 20 are as follows: the surface hardness is HRc60-HRc70, the balance degree is G40 grade, the smoothness is Ra0.02-Ra0.006, and the roughness is Ra0.8-Ra1.0;
s2: placing the base paper 10 between the mirror roller 20 and the auxiliary roller 40, spraying the film coating material between the mirror roller 20 and the base paper 10 through the film coating head 30, applying pressure to the base paper 10 sprayed with the film coating material through the mirror roller 20 to form a film coating layer with a smooth surface on the surface of the base paper 10, and obtaining the mirror surface separationForming paper; wherein the temperature of the mirror roller 20 is 5-10 ℃; the pressing speed of the mirror roller 20 is 10r/min-15 r/min; the pressing force of the mirror roller 20 is 1N-3N; the temperature of the drenching film head 30 is 260-300 ℃; the distance between the laminating head 30 and the mirror surface roller 20 is 350mm-450 mm; the film coating speed of the film coating machine is 15-20 m/min; the laminating amount of the laminating film layer is 1.2-1.8g/m2。
Comparative example 2
A preparation method of mirror release paper for leather comprises the following steps:
s1: providing a base paper 10, a film laminating material and a film laminating machine, wherein the film laminating machine comprises a mirror roller 20 with a smooth surface, an auxiliary roller 40 contacted with the surface of the mirror roller 20 and a film laminating head 30 positioned at the upper end of the mirror roller 20;the laminating material bag The composition comprises the following components in parts by weight: 100 parts of polyethylene;the quality index requirements of the mirror roller 20 are as follows: the surface hardness is HRc60-HRc70, the balance degree is G40 grade, the smoothness is Ra0.02-Ra0.006, and the roughness is Ra0.8-Ra1.0;
s2: placing the base paper 10 between the mirror surface roller 20 and the auxiliary roller 40, spraying the film spraying material between the mirror surface roller 20 and the base paper 10 through the film spraying head 30, and applying pressure to the base paper 10 sprayed with the film spraying material through the mirror surface roller 20 to form a film spraying material layer with a smooth surface on the surface of the base paper 10, so as to obtain the mirror surface release paper; wherein the temperature of the mirror roller 20 is 5-10 ℃; the pressing speed of the mirror roller 20 is 10r/min-15 r/min; the pressing force of the mirror roller 20 is 1N-3N; the temperature of the drenching film head 30 is 260-300 ℃; the distance between the laminating head 30 and the mirror surface roller 20 is 350mm-450 mm; the film coating speed of the film coating machine is 15-20 m/min; the laminating amount of the laminating film layer is 1.2-1.8g/m2。
Comparative example 3
A preparation method of mirror release paper for leather comprises the following steps:
s1: providing a base paper 10, a film coating material and a film coating machine, wherein the film coating machine comprises a mirror roller 20 with a smooth surface, and an auxiliary roller 40 contacted with the surface of the mirror roller 20And a laminating head 30 positioned at the upper end of the mirror roller 20; the laminating material comprises the following components in parts by weight: 60 parts of polypropylene and 40 parts of polyethylene;the quality index requirements of the mirror roller 20 are as follows: hard surface The degree is HRc60-HRc70, the balance degree is G100 grade, the finish Ra is more than 0.02, and the roughness Ra is more than 1.0;
s2: providing a base paper 10, a film laminating material and a film laminating machine, wherein the film laminating machine comprises a mirror roller 20 with a smooth surface, an auxiliary roller 40 contacted with the surface of the mirror roller 20 and a film laminating head 30 positioned at the upper end of the mirror roller 20; wherein the temperature of the mirror roller 20 is 5-10 ℃; the pressing speed of the mirror roller 20 is 10r/min-15 r/min; the pressing force of the mirror roller 20 is 1N-3N; the temperature of the drenching film head 30 is 260-300 ℃; the distance between the laminating head 30 and the mirror surface roller 20 is 350mm-450 mm; the film coating speed of the film coating machine is 15-20 m/min; the laminating amount of the laminating film layer is 1.2-1.8g/m2。
And (3) performance testing:
1. test objects: the release paper obtained in the examples 1 to 3 and the comparative examples 1 to 3.
2. The test method comprises the following steps:
and (3) anti-scratching test: making each release paper into 200 mm-200 mm specification, under a certain load, grinding the surface of the release paper for 20 times by using a rubber grinding wheel through revolution, and observing whether the surface of the release paper has scratches.
And (3) high-temperature testing: making each release paper into 200 mm-200 mm specification, sticking on leather, putting into a 100 ℃ oven, and observing whether the surface of the release paper is whitened or not.
TABLE 1
As can be seen from table 1, compared with comparative examples 1 to 3, the release paper obtained by the present invention has no scratch after the scratch-proof test, that is, the problem of wire drawing does not occur during the use process; after high-temperature test, no whitening phenomenon is generated, namely, the mirror surface of the leather coated with the mirror surface release paper does not have the whitening phenomenon after passing through an oven.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (10)
1. A preparation method of mirror release paper for leather is characterized by comprising the following steps:
s1: providing base paper, a film laminating material and a film laminating machine, wherein the film laminating machine comprises a mirror roller with a smooth surface, an auxiliary roller contacted with the surface of the mirror roller and a film laminating head positioned at the upper end of the mirror roller; the laminating material comprises the following components in parts by weight: 58-62 parts of polypropylene and 38-42 parts of polyethylene;
s2: placing the base paper between the mirror roller and the auxiliary roller, spraying the film spraying material between the mirror roller and the base paper through the film spraying head, and applying pressure to the base paper sprayed with the film spraying material through the mirror roller so as to form a film spraying material layer with a smooth surface on the surface of the base paper, thereby obtaining the mirror surface release paper.
2. The method for preparing the mirror release paper for leather according to claim 1, wherein the mass ratio of the polypropylene to the polyethylene is 3: 2.
3. the method for preparing the mirror release paper for leather according to claim 1, wherein the quality index requirements of the mirror roller are as follows: the surface hardness is HRc60-HRc70, the balance degree is G40 grade, the smoothness is Ra0.02-Ra0.006, and the roughness is Ra0.8-Ra1.0.
4. The method for preparing the mirror release paper for leather according to claim 1, wherein the temperature of the mirror roller is 5 ℃ to 10 ℃.
5. The method for preparing the mirror release paper for leather according to claim 1, wherein the press speed of the mirror roller is 10r/min to 15 r/min.
6. The method for preparing the mirror release paper for leather according to claim 1, wherein the pressing force of the mirror roller is 1N-3N.
7. The method for preparing the mirror release paper for leather according to claim 1, wherein the temperature of the laminating head is 260-300 ℃.
8. The method for preparing the mirror release paper for leather according to claim 1, wherein the distance between the laminating head and the mirror roller is 350mm-450 mm.
9. The method for preparing the mirror release paper for leather according to claim 1, wherein the film coating speed of the film coating machine is 15m/min-20 m/min.
10. The method for preparing the mirror release paper for leather according to claim 1, wherein the laminating amount of the laminating film layer is 1.2g/m2-1.8g/m2。
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