CN108277691A - A kind of leather release paper and its manufacturing process - Google Patents
A kind of leather release paper and its manufacturing process Download PDFInfo
- Publication number
- CN108277691A CN108277691A CN201710008244.8A CN201710008244A CN108277691A CN 108277691 A CN108277691 A CN 108277691A CN 201710008244 A CN201710008244 A CN 201710008244A CN 108277691 A CN108277691 A CN 108277691A
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- CN
- China
- Prior art keywords
- layer
- release
- modified
- adhesive layer
- leather
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/001—Release 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
-
- 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
- D21H19/80—Paper comprising more than one coating
- D21H19/82—Paper comprising more than one coating superposed
- D21H19/824—Paper comprising more than one coating superposed two superposed coatings, both being non-pigmented
-
- 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
- D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
- D21H23/64—Addition to the formed paper by contacting paper with a device carrying the material the material being non-fluent at the moment of transfer, e.g. in form of preformed, at least partially hardened coating
-
- 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
- D21H25/005—Mechanical treatment
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Synthetic Leather, Interior Materials Or Flexible Sheet Materials (AREA)
Abstract
The invention discloses a kind of leather release papers, including PP release layers, MODIFIED PP adhesive layer and original paper layer, the MODIFIED PP adhesive layer is formed in the upper surface of the original paper layer, the PP release layers are formed in the upper surface of the MODIFIED PP adhesive layer, and the MODIFIED PP adhesive layer is bonded the original paper layer and the PP release layers；The PP release layers are pure PP layers；The Raw Material Blending Ratio (percentage) of the MODIFIED PP adhesive layer is：PP 70 100% and PE 0 30%.By the above-mentioned means, low energy consumption for the production technology of the present invention, simple production process can reduce production cost；The release effect of product is good, reuses often；And the fixed effect of product is outstanding, and the simulated effect of dermatoglyph is good, and the present invention not silicate-containing oil, processing procedure and product are all environment friendly and pollution-free, no chemical residues.
Description
Technical field
The invention belongs to release paper technical fields, more particularly to a kind of leather release paper.
Background technology
Leather release paper is a kind of special paper kind that prevents adhesion, and english name is Leather Release Paper, mainly
Applied to the manufacture of polyurethane (PU) artificial leather and polyvinyl chloride (PVC) artificial leather product, and used when original PU and PVC manufactures
Paste resin, i.e., be coated on stainless steel band by stainless steel band method, and after drying and moulding, certain decorative pattern is shut out using cotton gin.
When using the production of leather release paper method, since leather release paper surface has certain glossiness and decorative pattern, and surface has
The release layer of superperformance, after drying, solidification crosslinking sizing, the stripping of leather release paper can be prepared into certain gloss and
The artificial leather product of decorative pattern.Leather release paper method produces PU than stainless steel band method and PVC artificial leather technique is more reasonable, small investment,
And it is particularly conducive to foam, artificial leather density obtained is small, good hand touch, and production can be greatly increased under the not increased situation of raw material
Amount.
Artificial synthetic leather release paper usually has double-layer structure：First layer is the body paper as base material, the second layer be from
Type layer.General manufacturing method has rubbing method, casting coating, and rubbing method is first to use thermoplastic resin with thermal coating side on body paper
Formula embosses and cures, or first to apply one layer of primary coat on body paper to prevent the infiltration of mould release, be coated coated on body paper
Release surface layer, embossing simultaneously cure, and the release coating in surface is formed on priming coat；Cast the release layer of the leather release paper of coating production
Coating is cast, is mainly made of pigment, adhesive and mould release, adhesive can be the water-soluble tree containing carboxyl or hydroxyl
Copolymer emulsion or the copolymer of polyacrylic acid and the acid polyethylene breast of the styrene-butadiene latex class of fat or solid content >=85%
Liquid.
The dermatine release paper that conventional coating methods or casting coating manufacture, lines is not unintelligible, true to nature, is not achieved
The vivid effect of dermatoglyph；In addition, it is also very high to the flatness requirement of body paper, otherwise it is difficult to produce fine lines, in this way
Virtually increase cost；And the release paper reuse number of cloth of coating-type production is few, can be fallen sharply using rear release every time,
The composition of raw materials for casting coating is more complex, and complex process not only results in production capacity reduction, and not easy to control.
Invention content
The invention mainly solves the technical problem of providing a kind of leather release paper, the energy consumptions of production technology of the invention
Low, simple production process can reduce production cost；The release effect of product is good, reuses often；And product is determined
The simulated effect of type excellent, dermatoglyph is good, and the present invention not silicate-containing oil, processing procedure and product are all environment friendly and pollution-free, no chemical residues.
In order to solve the above technical problems, one aspect of the present invention is：A kind of leather release paper is provided, including
PP release layers, MODIFIED PP adhesive layer and original paper layer, the MODIFIED PP adhesive layer are formed in the upper surface of the original paper layer, the PP
Release layer is formed in the upper surface of the MODIFIED PP adhesive layer, and the MODIFIED PP adhesive layer is bonded the original paper layer and the PP
Release layer；
The PP release layers are pure PP layers；
The Raw Material Blending Ratio (percentage) of the MODIFIED PP adhesive layer is：PP 70-100% and PE 0-
30%.
It further says, the thickness of the PP release layers is 10-70 μm.
It further says, the thickness of the MODIFIED PP adhesive layer is 10-70 μm.
It further says, the thickness of the original paper layer is 80-200 μm.
It further says, the original paper layer is broad-leaved paddle original paper layer or needle paddle original paper layer.
It further says, the leather release paper is embossing leather release paper.
A kind of manufacturing process of above-mentioned leather release paper, including：By the raw material of PP release layers and MODIFIED PP adhesive layer point
Jia Ru not be in the A screw rods and B screw rods of twin-screw laminating machine, then heating is melt into paste and squeezes out to distributor, using double respectively
The mode of layer coextrusion makes a side surface of original paper layer be formed simultaneously one layer of MODIFIED PP in a side surface lamination of the original paper layer
Adhesive layer and one layer of PP release layer.
Furthermore, further include：It is release in PP using three roller composite embossed modes of counter-pressure cylinder, rubber roller and flower roller
Decorative pattern needed for layer surface compacting.
Preferably, the processing temperature when heating melting of the PP release layers raw material is 260-320 DEG C, the MODIFIED PP
Processing temperature when the heating melting of adhesive layer raw material is 260-320 DEG C.
The beneficial effects of the invention are as follows：Beneficial effects of the present invention at least have the following：
One, the processing temperature when heating melting of PP release layers raw material of the present invention is 260-320 DEG C, which is conducive to carry
The release performance of high PP release layers is reused often and will not reduce its release performance, moreover it is possible to improve the pressure of PP release layers
Line fixed effect, especially dermatoglyph can show skin sense effect well；Contain a small amount of PE in MODIFIED PP adhesive layer raw material, PE has
Conducive to the viscosity of adhesive layer is improved, therefore, connecing for MODIFIED PP adhesive layer and original paper layer can be effectively improved after PP and PE melting completely
Put forth effort；
Two, preparation of the invention is using MODIFIED PP adhesive layer and the PP release layers lamination mode that double-layer coextrusion goes out simultaneously, only
Need to be primary to a side surface lamination of original paper layer, then wind and get product, compared to rubbing method or the production technology of casting coating, originally
Production technology is relatively simple, and low energy consumption, and process is easily controllable, and cost is relatively low；
Three, release performance of the invention is good, and Leather Factory is more easily peelable and highly stable when using, can be repeatedly anti-
Multiple use is without reducing release performance, to reduce client's use cost, and the release paper of other techniques such as cloth of coating-type,
Access times are few, and can often be fallen sharply using a release；
Four, not silicate-containing oil of the invention, processing procedure and product are all environment friendly and pollution-free, no chemical residues.
Description of the drawings
Fig. 1 is the structural schematic diagram of the present invention；
Fig. 2 is the process flow chart of the present invention；
The label of each component is as follows in attached drawing：
100-PP release layers, 200- MODIFIED PPs adhesive layer and 300- original paper layers.
Specific implementation mode
The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that advantages and features of the invention energy
It is easier to be readily appreciated by one skilled in the art, so as to make a clearer definition of the protection scope of the present invention.
A kind of leather release paper, as shown in Figure 1, the present invention includes PP (polypropylene) release layer 100, MODIFIED PP adhesive layer
200 and original paper layer 300, the MODIFIED PP adhesive layer 200 be formed in the upper surface of the original paper layer 300, the PP release layers 100
It is formed in the upper surface of the MODIFIED PP adhesive layer 200, and the MODIFIED PP adhesive layer 200 is bonded the original paper layer 300 and institute
State PP release layers 100；
The PP release layers 100 are pure PP layers；
The Raw Material Blending Ratio (percentage) of the MODIFIED PP adhesive layer 200 is：PP70-100% and PE are (poly-
Ethylene) 0-30%.
The thickness of the PP release layers 100 is 10-70 μm.
The thickness of the MODIFIED PP adhesive layer 200 is 10-70 μm.
The thickness of the original paper layer 300 is 80-200 μm.
The original paper layer 300 is broad-leaved paddle original paper layer or needle paddle original paper layer.
The leather release paper is embossing leather release paper.
Embodiment 1 all has above-mentioned identical structure to embodiment 7, the difference is that：
Embodiment 1：The Raw Material Blending Ratio of the MODIFIED PP adhesive layer 200 is：PP%80 and PE20%, the PP are release
The thickness of layer 100 is 30 μm, and the thickness of the MODIFIED PP adhesive layer 200 is 60 μm, and the thickness of the original paper layer 300 is 140 μm.
The Raw material processing temperature of the MODIFIED PP adhesive layer 200 is 260 DEG C, the Raw material processing temperature of the PP release layers 100
Degree is 260 DEG C, and cooling water temperature is 20 DEG C.
Embodiment 2：The Raw Material Blending Ratio of the MODIFIED PP adhesive layer 200 is：PP90% and PE10%, the PP are release
The thickness of layer 100 is 10 μm, and the thickness of the MODIFIED PP adhesive layer 200 is 30 μm, and the thickness of the original paper layer 300 is 200 μm.
The Raw material processing temperature of the MODIFIED PP adhesive layer 200 is 270 DEG C, the Raw material processing temperature of the PP release layers 100
Degree is 270 DEG C, and cooling water temperature is 16 DEG C.
Embodiment 3：The Raw Material Blending Ratio of the MODIFIED PP adhesive layer 200 is：PP100%, the PP release layers 100
Thickness is 50 μm, and the thickness of the MODIFIED PP adhesive layer 200 is 50 μm, and the thickness of the original paper layer 300 is 160 μm.
The Raw material processing temperature of the MODIFIED PP adhesive layer 200 is 290 DEG C, the Raw material processing temperature of the PP release layers 100
Degree is 290 DEG C, and cooling water temperature is 20 DEG C.
Embodiment 4：The Raw Material Blending Ratio of the MODIFIED PP adhesive layer 200 is：PP95% and PE5%, the PP are release
The thickness of layer 100 is 70 μm, and the thickness of the MODIFIED PP adhesive layer 200 is 10 μm, and the thickness of the original paper layer 300 is 110 μm.
The Raw material processing temperature of the MODIFIED PP adhesive layer 200 is 300 DEG C, the Raw material processing temperature of the PP release layers 100
Degree is 300 DEG C, and cooling water temperature is 18 DEG C.
Embodiment 5：The Raw Material Blending Ratio of the MODIFIED PP adhesive layer 200 is：PP70% and PE30%, the PP are release
The thickness of layer 100 is 40 μm, and the thickness of the MODIFIED PP adhesive layer 200 is 70 μm, and the thickness of the original paper layer 300 is 180 μm.
The Raw material processing temperature of the MODIFIED PP adhesive layer 200 is 320 DEG C, the Raw material processing temperature of the PP release layers 100
Degree is 320 DEG C, and cooling water temperature is 20 DEG C.
Embodiment 6：The Raw Material Blending Ratio of the MODIFIED PP adhesive layer 200 is：PP85% and PE15%, the PP are release
The thickness of layer 100 is 20 μm, and the thickness of the MODIFIED PP adhesive layer 200 is 40 μm, and the thickness of the original paper layer 300 is 80 μm.
The Raw material processing temperature of the MODIFIED PP adhesive layer 200 is 270 DEG C, the Raw material processing temperature of the PP release layers 100
Degree is 320 DEG C, and cooling water temperature is 20 DEG C.
Embodiment 7：The Raw Material Blending Ratio of the MODIFIED PP adhesive layer 200 is：PP75% and PE25%, the PP are release
The thickness of layer 100 is 60 μm, and the thickness of the MODIFIED PP adhesive layer 200 is 20 μm, and the thickness of the original paper layer 300 is 90 μm.
The Raw material processing temperature of the MODIFIED PP adhesive layer 200 is 270 DEG C, the Raw material processing temperature of the PP release layers 100
Degree is 320 DEG C, and cooling water temperature is 25 DEG C.
Embodiment 1 arrives embodiment 7, the manufacturing process of a kind of leather release paper, as shown in Fig. 2, including following step
Suddenly：
Step A：After body paper is carried out drying and sided corona treatment, lamination composite log is delivered to by unreeling machine；
Step B：The raw material of the raw material of PP release layers and MODIFIED PP adhesive layer is respectively fed to a twin-screw co-extrusion lamination
MODIFIED PP adhesive layer raw material and PP release layers raw material are heated melting by machine respectively by screw cylinder, and A screw cylinders are PP
Release layer raw material, B screw cylinders are MODIFIED PP adhesive layer raw material, processing temperature when wherein the heating of MODIFIED PP adhesive layer raw material melts
Degree is 260-320 DEG C, and the processing temperature when heating of PP release layer raw materials melts is 260-320 DEG C, and the heating melting time is 1-
3min, used screw diameter are ∮ 110mm, and draw ratio 36 can reach more preferably plasticizing effect and good tree thus
Fat physical property；
Step C：Heated MODIFIED PP adhesive layer raw material and PP release layers raw material are squeezed out to distributor again through mould simultaneously
Semi-finished product are made to the side of the body paper described in step A in head leaching, and it is 16- that wherein MODIFIED PP adhesive layer raw material, which squeezes out cooling temperature,
25 DEG C, PP release layer raw materials squeeze out cooling temperature be 16-25 DEG C, cooling time 1.5-3.5s；
Step D：Using three roller composite embossed modes of counter-pressure cylinder, rubber roller and flower roller, required decorative pattern is suppressed；Composite embossed is adopted
With oil cylinder mode, cylinder diameter ∮ 100mm are to obtain the line pressure (12-16 tons of oil cylinder gross thrust) of 50-60kg/cm；Counter-pressure cylinder is straight
Diameter ∮ 400- ∮ 500mm ensure to deform upon under regulation line pressure, top roller diameter ∮ 150- ∮ 200mm, can be identical
Ensure that higher line pressure, flower roller diameter ∮ 220mm- ∮ 400mm can be selected according to different lines units using difference under pressure
The flower roller of diameter；Linear velocity is 20m/min-50m/min；The logical cold water of three rollers, cooling water is 16-25 DEG C of temperature.
Embodiment 7 is arrived to embodiment 1, is tested for the property, record such as table 1.
Release paper produced by the present invention is tested for the property by the following method：
Reuse number：Artificial leather production process is simulated, the PU slurries or PVC of 150 μ m-thicks are coated on release paper surface
Stripping leather film, and clears up paper after slurry, drying and forming-film, then repeatedly gluing, drying, strip operation.Record is maximum to be repeated to shell
From number.
Peel strength (GB-8808 peel strengths measuring method)：In release paper (the Jinan orchid of peel bond strength meter 250mm*50mm
Light type BLD-50N precision 0.001N) peel strength removed from office in simulation artificial leather production process when film is stripped is measured, with constant
Artificial leather film and release paper are removed (180 ° of angles) by speed (300mm/min).It parallel 10 times, is averaged, unit：g/
30mm。
Compound fastness (GB-8808 peel strengths measuring method)：In release paper (the Jinan orchid of peel bond strength meter 250mm*25mm
Light type BLD-50N precision 0.001N) peel strength when MODIFIED PP adhesive layer and original paper layer are stripped is measured, with constant speed
MODIFIED PP adhesive layer and original paper layer are removed (180 ° of angles) by (300mm/min).It parallel 10 times, is averaged, unit：g/
25mm。
Table 1：
The sur-face peeling intensity of the release paper of the present invention can be down to 60g/30mm, and release is good；It is reachable to reuse number
78 times, 50 times at least reusable, compound fastness is generally cut up to 370 or more or layer, and release is stablized；Example 6 is best
Process conditions.
Example the above is only the implementation of the present invention is not intended to limit the scope of the invention, every to utilize this hair
Equivalent structure transformation made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant technical fields,
Similarly it is included within the scope of the present invention.
Claims (9)
1. a kind of leather release paper, it is characterised in that：Including PP release layers, MODIFIED PP adhesive layer and original paper layer, the MODIFIED PP
Adhesive layer is formed in the upper surface of the original paper layer, and the PP release layers are formed in the upper surface of the MODIFIED PP adhesive layer, and
The MODIFIED PP adhesive layer is bonded the original paper layer and the PP release layers；
The PP release layers are pure PP layers；
The Raw Material Blending Ratio (percentage) of the MODIFIED PP adhesive layer is：PP 70-100% and PE 0-30%.
2. a kind of leather release paper according to claim 1, it is characterised in that：The thickness of the PP release layers is 10-70 μ
m。
3. a kind of leather release paper according to claim 1, it is characterised in that：The thickness of the MODIFIED PP adhesive layer is
10-70μm。
4. a kind of leather release paper according to claim 1, it is characterised in that：The thickness of the original paper layer is 80-200 μ
m。
5. a kind of leather release paper according to claim 1, it is characterised in that：The original paper layer be broad-leaved paddle original paper layer or
Needle paddle original paper layer.
6. a kind of leather release paper according to claim 1, it is characterised in that：The leather release paper be embossing leather from
Type paper.
7. a kind of manufacturing process of leather release paper according to claim 1, it is characterised in that：Including：By PP release layers
It is separately added into the A screw rods and B screw rods of twin-screw laminating machine with the raw material of MODIFIED PP adhesive layer, then heating is melt into paste respectively
And squeeze out to distributor, in a side surface lamination of the original paper layer in such a way that double-layer coextrusion goes out, make the side of original paper layer
Surface is formed simultaneously one layer of MODIFIED PP adhesive layer and one layer of PP release layer.
8. a kind of manufacturing process of high temperature leather release paper according to claim 7, it is characterised in that：Further include：Using
Three roller composite embossed modes of counter-pressure cylinder, rubber roller and flower roller, the decorative pattern needed for PP release layer surface rollings.
9. a kind of manufacturing process of high temperature leather release paper according to claim 7, it is characterised in that：The PP release layers
Processing temperature when the heating melting of raw material is 260-320 DEG C, the processing when heating of the MODIFIED PP adhesive layer raw material melts
Temperature is 260-320 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710008244.8A CN108277691A (en) | 2017-01-05 | 2017-01-05 | A kind of leather release paper and its manufacturing process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710008244.8A CN108277691A (en) | 2017-01-05 | 2017-01-05 | A kind of leather release paper and its manufacturing process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108277691A true CN108277691A (en) | 2018-07-13 |
Family
ID=62800630
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710008244.8A Pending CN108277691A (en) | 2017-01-05 | 2017-01-05 | A kind of leather release paper and its manufacturing process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108277691A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024037055A1 (en) * | 2022-08-18 | 2024-02-22 | 中广核达胜加速器技术有限公司 | Leather release paper production apparatus and leather release paper production method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203866645U (en) * | 2014-04-18 | 2014-10-08 | 青岛鼎立强包装机械有限公司 | Low temperature type macromolecular leather release paper |
| CN203866647U (en) * | 2014-04-18 | 2014-10-08 | 青岛鼎立强包装机械有限公司 | High-temperature macromolecule leather release paper |
| CN204054816U (en) * | 2014-06-19 | 2014-12-31 | 浙江金昌纸业有限公司 | A kind of leather release liners based on film technique |
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2017
- 2017-01-05 CN CN201710008244.8A patent/CN108277691A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN203866645U (en) * | 2014-04-18 | 2014-10-08 | 青岛鼎立强包装机械有限公司 | Low temperature type macromolecular leather release paper |
| CN203866647U (en) * | 2014-04-18 | 2014-10-08 | 青岛鼎立强包装机械有限公司 | High-temperature macromolecule leather release paper |
| CN204054816U (en) * | 2014-06-19 | 2014-12-31 | 浙江金昌纸业有限公司 | A kind of leather release liners based on film technique |
Non-Patent Citations (1)
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024037055A1 (en) * | 2022-08-18 | 2024-02-22 | 中广核达胜加速器技术有限公司 | Leather release paper production apparatus and leather release paper production method |
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Application publication date: 20180713 |