CN101723132B - Release BOPP thin film and preparation method thereof - Google Patents
Release BOPP thin film and preparation method thereof Download PDFInfo
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- CN101723132B CN101723132B CN2009102050771A CN200910205077A CN101723132B CN 101723132 B CN101723132 B CN 101723132B CN 2009102050771 A CN2009102050771 A CN 2009102050771A CN 200910205077 A CN200910205077 A CN 200910205077A CN 101723132 B CN101723132 B CN 101723132B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92009—Measured parameter
- B29C2948/92114—Dimensions
- B29C2948/92152—Thickness
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92323—Location or phase of measurement
- B29C2948/92428—Calibration, after-treatment, or cooling zone
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92609—Dimensions
- B29C2948/92647—Thickness
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92857—Extrusion unit
- B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
- B29C2948/92895—Barrel or housing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92923—Calibration, after-treatment or cooling zone
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Laminated Bodies (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Wrappers (AREA)
Abstract
The invention relates to a release BOPP thin film and a preparation method thereof. The release BOPP thin film consist of a release layer, a transparent intermediate layer and a transparent corona layer from the outside to the inside in sequence, wherein the thickness ratio among the layers is 1:3:1. The formula of the release layer contains 50-90 percent by weight of high temperature resistant homopolymerization polypropylene, 0.1-1.0 percent by weight of release mater batch based on nanometer SiO2 and TiO2 release agent, common polypropylene and conventional addictives. The high temperature resistant homopolymerization polypropylene with higher proportion is used in the release layer and a nanometer antiblocking agent is added, so the release BOPP thin film has favorable functions of high temperature resistance and adhesion resistance for compound cold-sealing package; simultaneously no pollutants are transferred to the surface of a cold-sealing adhesive or the inner layer of a package material; and the release BOPP thin film has high practical value.
Description
Technical field
The present invention relates to a kind of BOPP film, particularly relate to a kind of release BOPP thin film that can be used for the anti-high temperature adhesion of having of cold envelope composite soft packaging function.
Background technology
At present, cold envelope composite soft packaging is in the packing of To Be Protected from Heat at chocolate, candy, biscuit, ice cream etc. content, and the fields such as packing of the emergency aid articles of pharmaceuticals industry and disinfection tool have obtained application more and more widely.Cold envelope composite soft packaging adopts common BOPP (Biaxially oriented polypropylene) film as printed layers always, and is compound with MPET (aluminized mylar) or MOPP (bidirectional stretching polypropylene film of aluminizing) then, relocates the coating cold seal glue.Because conventional SiO is only used on common BOPP top layer
2Antiblocking agent comes actual anti-stick continuous cropping to use, add conventional oleamide or erucyl amide and reduce the friction coefficient on top layer as slipping agent, therefore, when cold envelope composite soft packaging material rolling, the top layer of common BOPP and cold seal glue direct contact, only could normal separation under normal temperature or low temperature condition, if run into the hot and humid environment phenomenon that then usually sticks together, cause bulk material to scrap.And the transportation of packing, hot and humid environment is difficult to avoid.
Some BOPP producer is by increasing SiO in the BOPP top layer
2The addition of antiblocking agent and oleamide or erucyl amide slipping agent, make the BOPP top layer gather more antiblocking agent and separate out more slipping agent, though improved anti-stick company (release) ability of BOPP like this, but the too much slipping agent in top layer can be transferred to cold seal glue surface and packing internal layer with antiblocking agent when contacting with cold seal glue, thereby causes the contaminated of the reduction of the cold sealing strength of packing and packing.
Summary of the invention
The objective of the invention is to, overcome the defective that existing BOPP film exists, and provide a kind of new release BOPP thin film, when itself and cold seal glue direct contact, can either prevent BOPP top layer and the cold seal glue phenomenon that sticks together, can not produce pollutants again and transfer to cold seal glue surface or packing internal layer.
Another object of the present invention is, the production method and the manufacture craft of new release BOPP thin film is provided.
The object of the invention to solve the technical problems realizes by the following technical solutions.According to a kind of release BOPP thin film that the present invention proposes, to form by release layer, transparent intermediate layer, transparent corona layer successively from outside to inside, thickness proportion is about 1: 3: 1; The high temperature resistant homo-polypropylene that contains 50～90% percentage by weights in the prescription of described release layer, also contain simultaneously 0.1～1.0% percentage by weight based on nanoscale SiO
2, TiO
2The release master batch of mold release (antiblocking agent), all the other are plain polypropylene resin (comprising common homo-polypropylene and conventional additives, as slipping agent, antioxidant, antistatic additive etc.); Described high temperature resistant homo-polypropylene is the PP material with high-temperature stability, but heatproof reaches 140 ℃ or above temperature.
According to the release BOPP thin film of the embodiment of the invention, described transparent intermediate layer is common BOPP transparent intermediate layer material, can be the compound of a kind of common homo-polypropylene or the common homo-polypropylene of the multiple trade mark.
According to the release BOPP thin film of the embodiment of the invention, described transparent corona layer is the transparent corona layer material of common BOPP, can be a kind of common homo-polypropylene or the compound of the common homo-polypropylene of the multiple trade mark and an amount of additive.
The present invention also provides a kind of preparation method of release BOPP thin film, and it may further comprise the steps:
1) batch mixing is with dry: the raw material particle of release layer, transparent intermediate layer, transparent corona layer is fully stirred, make the raw material particle of each layer mix respectively, and then carry out drying and handle;
2) fusion and casting sheet: the fusion in extruder separately of each that mixes layer raw material, wherein, the melt temperature of release layer is at 250～280 ℃, more common homo-polypropylene temperature is high 10～20 ℃, the resin of fusion flows out by T type mouth mould, and be attached to the sharp cooling roll surface rapidly, form solid-state sheet material;
3) biaxial tension: solid-state sheet material enters the biaxial tension position, at first carries out longitudinal stretching, carries out cross directional stretch then, forms the polypropylene film of biaxial tension;
4) thickness measuring, corona and rolling: after the online thickness measurement of polypropylene film process through biaxial tension, beat corona treatment, be wound into half-blank then at the corona layer;
5) ageing treatment with cut: it is 25～40 ℃ that the half-blank of above rolling is placed on temperature, and relative humidity is to carry out about 48 hours ageing treatment in 60%～80%RH environment, and width cuts into rouleau as required then, is the release BOPP thin film finished product.
By technique scheme, release BOPP thin film of the present invention has following advantage at least:
1) release BOPP thin film of the present invention uses the high temperature resistant homo-polypropylene of larger proportion at release layer, and adding nanoscale antiblocking agent, making this BOPP film be used for compound cold package harness has good high temperature resistant anti-stick continuous cropping usefulness, does not have any pollutants simultaneously and transfers to cold seal glue surface or packing internal layer;
2) release BOPP thin film of the present invention, production process and common BOPP film are basic identical, need not any equipment or technological transformation, have very high practical value.
3) release BOPP thin film of the present invention is used for compound cold envelope packaging film, by saving the expense of accumulating link, makes that whole cost is low, has the higher market competitiveness.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of specification sheets, and for above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, below especially exemplified by preferred embodiment, and conjunction with figs., be described in detail as follows.
Description of drawings
Fig. 1 is the structure composition diagram of release BOPP thin film of the present invention.
Fig. 2 is the constructional drawing of compound cold envelope packaging film.
10: release layer
20: transparent intermediate layer
30: transparent corona layer
The specific embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, a kind of release BOPP thin film that foundation the present invention is proposed and preparation method thereof its specific embodiment, method, step, feature and effect thereof, describe in detail as after.
The preparation method of a kind of release BOPP thin film of the present invention, it may further comprise the steps:
Batch mixing is with dry: respectively each layer (release layer 10, central, clear layer 20, corona layer 30) raw material particle is fully stirred separately, it is mixed, carrying out the drying processing then;
Fusion and casting sheet: the fusion in extruder separately of each that mixes layer raw material, wherein, the melt temperature of release layer is at 250～280 ℃, more common homo-polypropylene temperature is high 10～20 ℃, the resin of fusion flows out by T type mouth mould, and be attached to the sharp cooling roll surface rapidly, form solid-state sheet material;
Biaxial tension: solid-state sheet material enters the biaxial tension position, at first carries out longitudinal stretching, carries out cross directional stretch then, forms the polypropylene film of biaxial tension;
Thickness measuring, corona and rolling: after the online thickness measurement of polypropylene film process through biaxial tension, beat corona treatment, be wound into half-blank then at the corona layer;
Ageing treatment with cut: the half-blank of above rolling is placed on the ageing treatment of carrying out in 35 ℃ of * 70%RH environment 48 hours, and width cuts into rouleau as required then, is the release BOPP thin film finished product.
Embodiment 1
A kind of release BOPP thin film as shown in Figure 1, is 3 layers of coextrusion biaxially oriented film, and gross thickness is 18 microns.The layer thickness of release layer (top layer) 10, central, clear layer 20 and corona layer 30 is followed successively by 2～4 microns, 10～12 microns, 2～4 microns.The high temperature resistant homo-polypropylene that contains 50～90% percentage by weights in the prescription of release layer 1, also contain simultaneously 0.1～1.0% percentage by weight based on nanoscale SiO
2, TiO
2The release master batch of mold release (antiblocking agent), other are common homo-polypropylene and conventional additives, as slipping agent, antioxidant, antistatic additive etc.Central, clear layer 2 is identical with the prescription of common BOPP film, can be the compound of a kind of common homo-polypropylene or the common homo-polypropylene of the multiple trade mark.Corona layer 3 is identical with the prescription of common BOPP film, can be a kind of common homo-polypropylene or the compound of the common homo-polypropylene of the multiple trade mark and an amount of additive.
Use the three-layer co-extruded biaxial tension technology that goes out, more than (release layer prescription melt temperature is at 250～280 ℃ with drying, fusion and casting sheet through batch mixing for the raw MAT'L pellet of prescription, more common homo-polypropylene temperature is high 10～20 ℃), biaxial tension, thickness measuring, corona and rolling, ageing treatment and the operation process such as cut, make the release BOPP thin film of 18 micron thickness.
Detect this release BOPP thin film, surface friction coefficient is about 0.35, and corona surface surface corona value keeps 〉=38 dyne.Corona aspect at release BOPP is printed, and is compound with MPET12 (12 micron thickness aluminized mylar) then, relocates the coating cold seal glue, makes compound cold package package material, and constructional drawing as shown in Figure 2.This compound cold package dress membrane structure is: release BOPP (bidirectional stretching polypropylene film)/INK (ink lay)/AD (adhesives)/MPET (aluminized mylar) or MOPP (bidirectional stretching polypropylene film of aluminizing)/CS (cold seal glue).Interlayer combined strength bination 〉=the 0.7N/15mm of compound cold package package material, cold sealing strength 〉=2N/15mm, the adhesion intensity≤0.5N/15mm of release BOPP and cold seal glue under the normal temperature; After in 70 ℃ of environment, carrying out 1 month high temperature resistant test, the adhesion intensity of release BOPP and cold seal glue still≤0.5N/15mm, not having any pollutants transfers on the cold seal glue or does not have any cold seal glue and transfer on the BOPP, cold sealing strength still 〉=2N/15mm, interlayer combined strength bination 〉=0.7N/15mm.
Embodiment 2
A kind of release BOPP thin film as shown in Figure 1, is 3 layers of coextrusion biaxially oriented film, and gross thickness is 15 microns.The layer thickness of release layer (top layer) 1, central, clear layer 2 and corona layer 3 is followed successively by 2～4 microns, 8～10 microns, 2～4 microns.The high temperature resistant homo-polypropylene that contains 50～90% percentage by weights in the prescription of release layer 1, also contain simultaneously 0.1～1.0% percentage by weight based on nanoscale SiO
2, TiO
2The release master batch of mold release (antiblocking agent), other are plain polypropylene and conventional additives, as slipping agent, antioxidant, antistatic additive etc.Central, clear layer 2 is identical with the prescription of common BOPP film, can be the compound of a kind of common homo-polypropylene or the common homo-polypropylene of the multiple trade mark.Corona layer 3 is identical with the prescription of common BOPP film, can be a kind of common homo-polypropylene or the compound of the common homo-polypropylene of the multiple trade mark and an amount of additive.
Use the three-layer co-extruded biaxial tension technology that goes out, more than (release layer prescription melt temperature is at 250～280 ℃ with drying, fusion and casting sheet through batch mixing for the raw MAT'L pellet of prescription, more common homo-polypropylene temperature is high 10～20 ℃), biaxial tension, thickness measuring, corona and rolling, ageing treatment and the operation process such as cut, make the release BOPP film of 15 micron thickness.
Detect this release BOPP thin film, surface friction coefficient is about 0.40, and corona surface surface corona value keeps 〉=38 dyne.Corona aspect at release BOPP is printed, and is compound with MOPP20 (20 micron thickness aluminize bidirectional stretching polypropylene film) then, relocates the coating cold seal glue, makes compound cold package package material, and constructional drawing as shown in Figure 2.The structure of this compound cold envelope packaging film is: release BOPP (bidirectional stretching polypropylene film)/INK (ink lay)/AD (adhesives)/MPET (aluminized mylar) or MOPP (bidirectional stretching polypropylene film of aluminizing)/CS (cold seal glue).Interlayer combined strength bination 〉=the 0.7N/15mm of compound cold package package material, cold sealing strength 〉=2N/15mm, the adhesion intensity≤0.5N/15mm of release BOPP and cold seal glue under the normal temperature; After in 70 ℃ of environment, carrying out 1 month high temperature resistant test, the adhesion intensity of release BOPP and cold seal glue still≤0.5N/15mm, not having any pollutants transfers on the cold seal glue or does not have any cold seal glue and transfer on the BOPP, cold sealing strength still 〉=2N/15mm, interlayer combined strength bination 〉=0.7N/15mm.
Can learn by the foregoing description, release BOPP thin film of the present invention uses the high temperature resistant homo-polypropylene of larger proportion at release layer, and adding nanoscale antiblocking agent, making this BOPP film be used for compound cold package harness has good high temperature resistant anti-stick continuous cropping usefulness, does not have any pollutants simultaneously and transfers to cold seal glue surface or packing internal layer; The used high temperature resistant homo-polypropylene of the present invention is the PP material with high-temperature stability, but heatproof reaches 140 ℃ or above temperature, and it is a kind of high three-dimensional, the homopolymerization PP of systematicness, it compares the crystallinity height with general PP, makes the rigidity of product and a kind of resin that resistance to effect of heat has essence to improve.Release BOPP thin film of the present invention is used for compound cold envelope packaging film, by saving the expense of accumulating link, makes that whole cost is low, has the higher market competitiveness.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be not break away from the technical solution of the present invention content, according to technical spirit of the present invention to any simple modification that above embodiment did, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (5)
1. release BOPP thin film, it is characterized in that: this release BOPP thin film is made up of release layer, transparent intermediate layer, transparent corona layer from outside to inside successively, and the layer thickness ratio is about 1: 3: 1; The high temperature resistant homo-polypropylene that contains 50～90% percentage by weights in the prescription of described release layer, also contain simultaneously 0.1～1.0% percentage by weight based on nanoscale SiO
2, TiO
2The release master batch of mold release, all the other are plain polypropylene resin and conventional additives; Described high temperature resistant homo-polypropylene is the PP material with high-temperature stability, but heatproof reaches 140 ℃ or above temperature.
2. release BOPP thin film according to claim 1 is characterized in that: described plain polypropylene resin comprises common homo-polypropylene; Described conventional additives comprises: slipping agent, antioxidant, and antistatic additive.
3. release BOPP thin film according to claim 1 is characterized in that: its material of described transparent intermediate layer is the compound of a kind of common homo-polypropylene or the common homo-polypropylene of the multiple trade mark.
4. release BOPP thin film according to claim 1 is characterized in that: described transparent its material of corona layer is a kind of common homo-polypropylene or the compound of the common homo-polypropylene of the multiple trade mark and an amount of additive.
5. the preparation method of a release BOPP thin film according to claim 1 is characterized in that it may further comprise the steps:
1) batch mixing is with dry: the raw material particle with release layer, transparent intermediate layer, transparent corona layer fully stirs separately respectively, makes the raw material particle of each layer mix respectively, and then carries out drying and handle;
2) fusion and casting sheet: the fusion in extruder separately of each that mixes layer raw material, wherein, the melt temperature of release layer is at 250～280 ℃, more common homo-polypropylene temperature is high 10～20 ℃, the resin of fusion flows out by T type mouth mould, and be attached to the sharp cooling roll surface rapidly, form solid-state sheet material;
3) biaxial tension: solid-state sheet material enters the biaxial tension position, at first carries out longitudinal stretching, carries out cross directional stretch then, forms the polypropylene film of biaxial tension;
4) thickness measuring, corona and rolling: after the online thickness measurement of polypropylene film process through biaxial tension, beat corona treatment, be wound into half-blank then at the corona layer;
5) ageing treatment with cut: it is 25～40 ℃ that the half-blank of above rolling is placed on temperature, and relative humidity is to carry out about 48 hours ageing treatment in 60%～80%RH environment, and width cuts into rouleau as required then, is the release BOPP thin film finished product.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009102050771A CN101723132B (en) | 2009-10-22 | 2009-10-22 | Release BOPP thin film and preparation method thereof |
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|---|---|---|---|
| CN2009102050771A CN101723132B (en) | 2009-10-22 | 2009-10-22 | Release BOPP thin film and preparation method thereof |
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| CN101723132B true CN101723132B (en) | 2011-07-06 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105172284A (en) * | 2015-07-30 | 2015-12-23 | 中山火炬职业技术学院 | BOPP film with endurable and smoothness characteristics and preparation method therefor |
| CN107083212A (en) * | 2017-05-25 | 2017-08-22 | 句容市兴武包装有限公司 | A kind of flexible packaging film cold seal glue and preparation method thereof |
| CN107972346A (en) * | 2017-12-15 | 2018-05-01 | 广东威孚包装材料有限公司 | A kind of CPP high temperature resistants protective film basement membrane and preparation method thereof |
| CN109278389B (en) * | 2018-09-30 | 2020-12-08 | 安徽国风塑业股份有限公司 | Coating-free biaxially oriented polypropylene cold seal base film and preparation method thereof |
| CN113183580A (en) * | 2021-05-28 | 2021-07-30 | 广东德冠薄膜新材料股份有限公司 | Biaxially oriented polypropylene release film, preparation method thereof and adhesive tape film |
| CN113211754A (en) * | 2021-06-03 | 2021-08-06 | 牡丹江祥丰塑业有限公司 | BOPP high-temperature-resistant protective film and preparation method thereof |
| CN113956816A (en) * | 2021-11-25 | 2022-01-21 | 东莞澳中新材料科技股份有限公司 | High-temperature-resistant and easily-unwound composite expansion adhesive tape and preparation method and application thereof |
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