CN109278389A - One kind is exempted to be coated with Biaxially oriented polypropylene cold seal basement membrane and preparation method thereof - Google Patents
One kind is exempted to be coated with Biaxially oriented polypropylene cold seal basement membrane and preparation method thereof Download PDFInfo
- Publication number
- CN109278389A CN109278389A CN201811166465.9A CN201811166465A CN109278389A CN 109278389 A CN109278389 A CN 109278389A CN 201811166465 A CN201811166465 A CN 201811166465A CN 109278389 A CN109278389 A CN 109278389A
- Authority
- CN
- China
- Prior art keywords
- cold seal
- basement membrane
- coated
- homopolypropylene
- biaxially oriented
- Prior art date
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- 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
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
- B29C55/04—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique
- B29C55/06—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique parallel with the direction of feed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/0008—Electrical discharge treatment, e.g. corona, plasma treatment; wave energy or particle radiation
Abstract
Exempt to be coated with Biaxially oriented polypropylene cold seal basement membrane and preparation method thereof the invention discloses one kind, the cold seal basement membrane is made of extexine, sandwich layer and endosexine, and surface layer is made of antistatic master batch 1~10%, modified polypropene 10~80%, homopolypropylene for surplus；The modified polypropene is mixed by mass percentage by following components: tetrafluoroethylene-perfluoro propyl vinyl ether copolymer 1~30%, polypropylene are surplus；The endosexine is made of by mass percentage following components: antistatic master batch 1~5%, resist blocking and that masterbatch 1~3%, linear low density polyethylene 3~10%, ethylene-propylene-diene ternary polymerization masterbatch 1~10%, homopolypropylene are surplus.Tetrafluoroethylene-perfluoro propyl vinyl ether copolymer is added in its extexine, makes without being coated with silicon substrate release layer, can be directly as cold seal basement membrane.Reduce painting process, substantially increases production efficiency；And reduce production cost.
Description
Technical field
The present invention relates to thin film technique fields, and in particular to one kind is exempted to be coated with Biaxially oriented polypropylene cold seal basement membrane and its system
Preparation Method.
Background technique
There is cold seal technology in European Flexible-Packaging Industry at the end of the 20th century, and by the inspiration of self-adhering type envelope, this technology is in chalk
It is applied first in power production.With the continuous expansion of use scope, it may also be used for the packaging of thermosensitive products and medical supplies.
Cold seal is for heat-sealing, and the sealing temperatures of cold seal material generally only have 20-40 DEG C, the sealing of heat-sealable material
Temperature is generally greater than 80 DEG C.Cold seal packing technique have lot of advantages, as the low peculiar smell of cold seal film, it is pollution-free, can directly with food
Product contact, avoids high temperature from bringing damage to content；High production efficiency, packaging speed are 5-6 times of heat sealed package；After sealing
It is moderate to pack sealing strength；Compared with heat sealed package, material and the energy etc. are saved.
Cold seal film is a kind of new product, new technology, and bidirection drawed BOPP film used also belongs to high value added product, city
Field has a extensive future.
But when commonly bidirectional stretching polypropylene film is used for cold seal substrate, need to be coated with the release material of silicon substrate in outer surface
When in order to avoid cold seal glue being removed, there is colloid residual unfavorable condition in material, and painting process affects the production efficiency of cold seal film.
Summary of the invention
To avoid above-mentioned existing deficiencies in the technology, the purpose of the present invention is to provide one kind exempt to be coated with it is two-way
Oriented polypropylene cold seal basement membrane and preparation method thereof.
One kind is exempted to be coated with Biaxially oriented polypropylene cold seal basement membrane, which is by extexine, sandwich layer and endosexine group
At the extexine is made of by mass percentage following components: antistatic master batch 1~10%, modified polypropene 10~
80%, homopolypropylene is surplus；
The modified polypropene is mixed by mass percentage by following components: tetrafluoroethylene-perfluoro propyl ethylene
Base ether copolymer 1-30%, polypropylene are surplus；
The endosexine is made of by mass percentage following components: antistatic master batch 1~5%, resist blocking and that masterbatch 1~
3%, linear low density polyethylene 3~10%, ethylene-propylene-diene ternary polymerization masterbatch 1~10%, homopolypropylene are
Surplus.
Further scheme, the extexine with a thickness of 0.8~2.5 μm, the endosexine with a thickness of 1.2~3.0 μm.
The thickness setting of basement membrane China and foreign countries, endosexine of the present invention, can make basement membrane be provided simultaneously with excellent printing performance and release effect.
Further scheme, the resist blocking and that masterbatch are mixed by mass percentage by following components: unformed dioxy
SiClx 3~10%, spherical glass beads 3~10%, homopolypropylene are surplus.
This specific resist blocking and that masterbatch can make roughness of film be more suitable for shallow reticulated printing, printing effect in the present invention
More preferably, and cold seal glue preferably compound fastness is provided.
Preferably, the partial size of the amorphous silica is 4.5~5.5 μm, and the partial size of spherical glass beads is 3~4 μ
m。
Further scheme, ethylene segment accounts for 1~8wt%, fourth two in the ethylene-propylene-diene ternary polymerization masterbatch
Alkene segment accounts for 5~10wt%, remaining as polypropylene segments.
The present invention selects the ethylene-propylene-diene ternary polymerization masterbatch of such structure, and film can be made in coating cold seal glue
When, cold seal glue and film bonding force are stronger.
Further scheme, the sandwich layer are made of by mass percentage following components: antistatic master batch 1~10%,
Poly- polypropylene is surplus.
Preferably, the antistatic master batch is glycerin monostearate, fatty acid polyethylene glycol ester, N, N- dihydroxy ethyl ten
The mixture of at least two and homopolypropylene in eight amine, poly alkyl alcohol ether amide.Such antistatic master batch can make film same
When with excellent quick-acting and long-acting antistatic effect.
Another goal of the invention of the invention is to provide a kind of above-mentioned system for exempting to be coated with Biaxially oriented polypropylene cold seal basement membrane
Preparation Method, its step are as follows:
(1) according to the ratio, core material is delivered to double screw extruder, with 240~260 DEG C of heating meltings, and by true
Empty pump filters system, removes steam, small molecular weight impurity in raw material, through 400 mesh candle wick formula filters, forms sandwich layer melt；
The component of extexine and endosexine is separately added into two double screw extruders and melted, vacuumize moisture removal
After impurity, through the flat filter of 250 mesh, extexine melt and endosexine melt are formed；
(2) extexine, sandwich layer and endosexine melt are sequentially added in three-decker die head to converge and squeeze out to obtain diaphragm, utilized
Chilling on the membrane attaching to 20~40 DEG C of sharp cooling roll is formed slab by patch air knife；
(3) slab is proceeded through longitudinal stretching is sheet, and preheating temperature is 120~140 DEG C, draft temperature 130
~135 DEG C, stretching ratio be 4.5~4.8 times；
(4) sheet material after longitudinal stretching is entered horizontal drawing case, preheating temperature is 170~180 DEG C, draft temperature be 150~
155 DEG C, 160~170 DEG C of shaping area, stretching ratio is 9~9.5 times, and retraction ratio is 1.6~2.5%；
(5) film is flattened by the air-cooled trailer system that enters, and inner surface carries out sided corona treatment, is wound；Then
After Wetted constructures, finished product is made in cutting, packaging.
The present invention with tetrafluoroethylene-perfluoro propyl vinyl ether copolymer come modified polypropene, it is hydrophobic due to fluorine material
Performance, so that making the extexine of cold seal basement membrane has hydrophobic performance, it, can be directly as cold seal base without being coated with release layer
Film.When it is used for cold seal substrate compared to common bidirectional stretching polypropylene film, need to be coated with silicon substrate separated type material in outer surface,
Reduce painting process, substantially increases production efficiency；And reduce production cost.
So film prepared by the present invention can be used for cold seal film field, endosexine is after sided corona treatment, surface tension
Height, cold seal glue coating bonding force is strong, is not easy degumming；Extexine is without being coated with silicon substrate release layer, and surface tension is low, antistatic effect
Good, release effect is good, no residue glue；In addition, film physical mechanical property prepared by the present invention and excellent in optical properties, electrostatic is small,
Processing technology is simple.
Specific implementation method
Ethylene segment accounts for 1~8wt%, butadiene in ethylene-propylene-diene ternary polymerization masterbatch in following embodiments
Segment accounts for 5~10wt%, remaining as polypropylene segments.
Embodiment 1:
A kind of preparation method for exempting to be coated with Biaxially oriented polypropylene cold seal basement membrane, its step are as follows:
A, 5% antistatic master batch (mixture of tristerin, fatty acid polyethylene glycol ester and homopolypropylene),
95% homopolypropylene is delivered to double screw extruder by proportion, with 250 DEG C of heating meltings, and by vacuum filtration system
System removes steam, small molecular weight impurity in raw material, through 400 mesh candle wick formula filters, forms sandwich layer melt；
By 5% antistatic master batch (mixture of tristerin, fatty acid polyethylene glycol ester and homopolypropylene),
15% modified polypropene (tetrafluoroethylene-perfluoro propyl vinyl ether copolymer 1 0%, polypropylene 90), 80% homopolypropylene,
By proportion, it is added in a double screw extruder after being melted, vacuumizing removal moisture impurity, through the flat filter of 250 mesh, shape
At extexine melt；
By 5% antistatic master batch (mixture of tristerin, fatty acid polyethylene glycol ester and homopolypropylene),
(amorphous silica 3% that partial size is 5 μm, the spherical glass beads 5% that partial size is 3.5 μm, homopolymerization are poly- for 3% adhesion masterbatch
Propylene 92%), 3% linear low density polyethylene, 5% ethylene-propylene-diene ternary polymerization masterbatch, 84% homopolypropylene
After proportion, it is added in another double screw extruder after melting, vacuumize process moisture removal impurity, forms endosexine melt；
Extexine, sandwich layer and endosexine melt are sequentially added in three-decker die head and converged, die temperature 240
DEG C, squeeze out to obtain diaphragm；
B, chilling on the membrane attaching to sharp cooling roll is formed into slab using high pressure patch air knife, and enters water-bath, chilling roller
Temperature is 32 DEG C, and bath temperature is 28 DEG C；
C, slab is proceeded through longitudinal stretching is sheet, and indulging and drawing preheating temperature is 130 DEG C, and draft temperature is 98 DEG C, fixed
Type area temperature is 110 DEG C, and stretching ratio is 4.8 times.It is vertical that preheating, stretching, shaping roller tube is drawn to be both needed to using Teflon material coating；
D, sheet progress cross directional stretch is made and exempts to be coated with bidirectional stretching polypropylene film cold seal basement membrane with a thickness of 18 μm, in advance
Hot temperature is 178 DEG C, and draft temperature is 153 DEG C, and setting temperature is 168 DEG C, and stretching ratio is 9.5 times；
E, gained film in step d) is cooling by natural wind, at trailer system flattening, trimming, thickness measuring, corona
Reason, then winds；After testing after qualification, is cut, batched, finished product is made.
F, end properties index is as follows:
Embodiment 2:
A, 6% antistatic master batch, 94% homopolypropylene (N, N- dihydroxy ethyl octadecylamine, poly alkyl alcohol ether amide and
Gather polyacrylic mixture), by proportion, it is delivered to double screw extruder, with 248 DEG C of heating meltings, and by vacuum filtration
System removes steam, small molecular weight impurity in raw material, through 400 mesh candle wick formula filters, forms sandwich layer melt；
By (the mixing of N, N- dihydroxy ethyl octadecylamine, poly alkyl alcohol ether amide and homopolypropylene of 6% antistatic master batch
Object), 20% modified polypropene (tetrafluoroethylene-perfluoro propyl vinyl ether copolymer 20%, polypropylene 80%), 75% homopolymerization it is poly-
Propylene is added in a double screw extruder after being melted, vacuumizing removal moisture impurity by proportion, through the flat filtering of 250 mesh
Device forms extexine melt；
By (the mixing of N, N- dihydroxy ethyl octadecylamine, poly alkyl alcohol ether amide and homopolypropylene of 4% antistatic master batch
Object), 2.5% adhesion masterbatch (amorphous silica 10% that partial size is 4.5 μm, the spherical glass beads 3% that partial size is 3 μm,
Homopolypropylene 97), 4% linear low density polyethylene, 8% ethylene-propylene-diene ternary polymerization masterbatch, 81.5% homopolymerization
After polypropylene proportion, it is added in another double screw extruder after melting, vacuumize process moisture removal impurity, forms endosexine
Melt；
Extexine, sandwich layer and endosexine melt are sequentially added in three-decker die head and converged, die temperature 242
DEG C, squeeze out to obtain diaphragm；
B, chilling on the membrane attaching to sharp cooling roll is formed into slab using high pressure patch air knife, and enters water-bath, chilling roller
Temperature is 30 DEG C, and bath temperature is 26 DEG C；
C, slab is proceeded through longitudinal stretching is sheet, and indulging and drawing preheating temperature is 125 DEG C, and draft temperature is 96 DEG C, fixed
Type area temperature is 105 DEG C, and stretching ratio is 4.6 times.It is vertical that preheating, stretching, shaping roller tube is drawn to be both needed to using Teflon material coating；
D, sheet progress cross directional stretch is made and exempts to be coated with bidirectional stretching polypropylene film cold seal basement membrane with a thickness of 18 μm, in advance
Hot temperature is 179 DEG C, and draft temperature is 155 DEG C, and setting temperature is 168 DEG C, and stretching ratio is 9.0 times；
E, gained film in step d) is cooling by natural wind, at trailer system flattening, trimming, thickness measuring, corona
Reason, then winds；After testing after qualification, is cut, batched, finished product is made.
F, end properties index is as follows:
Embodiment 3
The preparation method is the same as that of Example 1, and the composition of each layer is as follows:
Sandwich layer is made of by mass percentage following components: antistatic master batch (fatty acid polyethylene glycol ester, poly alkyl alcohol
The mixture of ether amide and homopolypropylene) 1%, homopolypropylene 99%.
Extexine is made of by mass percentage following components: antistatic master batch (fatty acid polyethylene glycol ester, fatty alcohol
The mixture of polyetheramides and homopolypropylene) 1%, modified polypropene 10%, homopolypropylene 89%；Wherein modified polypropene
It is to be mixed by mass percentage by following components: tetrafluoroethylene-perfluoro propyl vinyl ether copolymer 1 %, polypropylene
99%；
Endosexine is made of by mass percentage following components: antistatic master batch (fatty acid polyethylene glycol ester, fat
The mixture of alcohol polyetheramides and homopolypropylene) 1%, resist blocking and that masterbatch 1%, linear low density polyethylene 10%, ethylene-the third
Alkene-butadiene tri-component is copolymerized masterbatch 10%, homopolypropylene 78%.
Wherein resist blocking and that masterbatch is mixed by mass percentage by following components: partial size is unformed the two of 5.5 μm
Silica 10%, the spherical glass beads 10% that partial size is 34 μm, homopolypropylene 80%.
Embodiment 4
The preparation method is the same as that of Example 1, and the composition of each layer is as follows:
Sandwich layer is made of by mass percentage following components: antistatic master batch (tristerin, aliphatic alcohol polyether acyl
The mixture of amine and homopolypropylene) 10%, homopolypropylene 90%.
Extexine is made of by mass percentage following components: antistatic master batch (tristerin, aliphatic alcohol polyether
The mixture of amide and homopolypropylene) 10%, modified polypropene 80%, homopolypropylene 70%；Wherein modified polypropene is
It is mixed by mass percentage by following components: tetrafluoroethylene-perfluoro propyl vinyl ether copolymer 30%, polypropylene
70%；
Endosexine is made of by mass percentage following components: antistatic master batch (tristerin, aliphatic alcohol polyether
The mixture of amide and homopolypropylene) 1%, resist blocking and that masterbatch 3%, linear low density polyethylene 3%, ethylene-propylene-fourth two
Alkene ternary polymerization masterbatch 1%, homopolypropylene 92%.
Wherein resist blocking and that masterbatch is mixed by mass percentage by following components: partial size is unformed the two of 4.5 μm
Spherical glass beads 3~10% that silica 3%, partial size are 3 μm, homopolypropylene are surplus.
Claims (8)
1. one kind is exempted to be coated with Biaxially oriented polypropylene cold seal basement membrane, which is made of extexine, sandwich layer and endosexine,
It is characterized by:
The extexine is made of by mass percentage following components: antistatic master batch 1~10%, modified polypropene 10~
80%, homopolypropylene is surplus；
The modified polypropene is mixed by mass percentage by following components: tetrafluoroethylene-perfluoro propyl vinyl ether
Copolymer 1~30%, polypropylene are surplus；
The endosexine is made of by mass percentage following components: antistatic master batch 1~5%, resist blocking and that masterbatch 1~3%, line
Property low density polyethylene (LDPE) 3~10%, ethylene-propylene-diene ternary polymerization masterbatch 1~10%, homopolypropylene be surplus.
2. one kind according to claim 1 is exempted to be coated with Biaxially oriented polypropylene cold seal basement membrane, it is characterised in that: the appearance
Layer with a thickness of 0.8~2.5 μm, the endosexine with a thickness of 1.2~3.0 μm.
3. one kind according to claim 1 is exempted to be coated with Biaxially oriented polypropylene cold seal basement membrane, it is characterised in that: described anti-stick
Even masterbatch is mixed by mass percentage by following components: amorphous silica 3~10%, spherical glass beads 3~
10%, homopolypropylene is surplus.
4. one kind according to claim 3 is exempted to be coated with Biaxially oriented polypropylene cold seal basement membrane, it is characterised in that: the nothing is fixed
The partial size of type silica is 4.5~5.5 μm, and the partial size of spherical glass beads is 3~4 μm.
5. one kind according to claim 1 is exempted to be coated with Biaxially oriented polypropylene cold seal basement membrane, it is characterised in that: the second
Ethylene segment accounts for 1~8wt% in alkene-acrylic-butadiene ternary polymerization masterbatch, and butadiene segment accounts for 5~10wt%, remaining as propylene
Segment.
6. one kind according to claim 1 is exempted to be coated with Biaxially oriented polypropylene cold seal basement membrane, it is characterised in that: the sandwich layer
Be made of by mass percentage following components: antistatic master batch 1~10%, homopolypropylene are surplus.
7. one kind according to claim 1 or 6 is exempted to be coated with Biaxially oriented polypropylene cold seal basement membrane, it is characterised in that: described
Antistatic master batch is glycerin monostearate, fatty acid polyethylene glycol ester, N, N- dihydroxy ethyl octadecylamine, poly alkyl alcohol ether amide
In at least two with the mixture of homopolypropylene.
8. a kind of preparation method for exempting to be coated with Biaxially oriented polypropylene cold seal basement membrane as described in any one of claims 1 to 7,
Be characterized in that: its step are as follows:
(1) according to the ratio, core material is delivered to double screw extruder, with 240~260 DEG C of heating meltings, and is taken out by vacuum
Filter system removes steam, small molecular weight impurity in raw material, through 400 mesh candle wick formula filters, forms sandwich layer melt；
The component of extexine and endosexine is separately added into two double screw extruders and melted, vacuumize removal moisture impurity
Afterwards, through the flat filter of 250 mesh, extexine melt and endosexine melt are formed；
(2) extexine, sandwich layer and endosexine melt are sequentially added in three-decker die head to converge and squeeze out to obtain diaphragm, utilize patch
Chilling on the membrane attaching to 20~40 DEG C of sharp cooling roll is formed slab by air knife；
(3) slab is proceeded through longitudinal stretching is sheet, and preheating temperature is 120~140 DEG C, draft temperature is 130~135
DEG C, stretching ratio be 4.5~4.8 times；
(4) sheet material after longitudinal stretching is entered horizontal drawing case, and preheating temperature is 170 ~ 180 DEG C, draft temperature is 150 ~ 155 DEG C,
160 ~ 170 DEG C of shaping area, stretching ratio are 9 ~ 9.5 times, and retraction ratio is 1.6 ~ 2.5%；
(5) film is flattened by the air-cooled trailer system that enters, and inner surface carries out sided corona treatment, is wound；Then pass through
After ageing treatment, finished product is made in cutting, packaging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811166465.9A CN109278389B (en) | 2018-09-30 | 2018-09-30 | Coating-free biaxially oriented polypropylene cold seal base film and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811166465.9A CN109278389B (en) | 2018-09-30 | 2018-09-30 | Coating-free biaxially oriented polypropylene cold seal base film and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109278389A true CN109278389A (en) | 2019-01-29 |
| CN109278389B CN109278389B (en) | 2020-12-08 |
Family
ID=65177063
Family Applications (1)
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| CN201811166465.9A Active CN109278389B (en) | 2018-09-30 | 2018-09-30 | Coating-free biaxially oriented polypropylene cold seal base film and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110498910A (en) * | 2019-08-26 | 2019-11-26 | 青岛嘉泽包装有限公司 | A kind of low temperature packing film and preparation method thereof |
| CN111231462A (en) * | 2019-03-22 | 2020-06-05 | 上海灵博塑料包装有限公司 | Easy-to-open transparent polyethylene blown film with thickness of less than 45 micrometers and preparation method thereof |
| CN114290782A (en) * | 2022-01-13 | 2022-04-08 | 广东德冠包装材料有限公司 | Biaxially oriented polypropylene film for epoxy resin curing and preparation method thereof |
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| CN101723132A (en) * | 2009-10-22 | 2010-06-09 | 惠州宝柏包装有限公司 | Release BOPP thin film and preparation method thereof |
| CN101885256A (en) * | 2010-06-22 | 2010-11-17 | 佛山市塑兴母料有限公司 | Release liner and production method thereof |
| CN105522798A (en) * | 2016-01-06 | 2016-04-27 | 湖南尚鑫新材料科技有限公司 | High-temperature-resistant compound release film and producing method thereof |
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| CN101723132A (en) * | 2009-10-22 | 2010-06-09 | 惠州宝柏包装有限公司 | Release BOPP thin film and preparation method thereof |
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| CN110498910A (en) * | 2019-08-26 | 2019-11-26 | 青岛嘉泽包装有限公司 | A kind of low temperature packing film and preparation method thereof |
| CN114290782A (en) * | 2022-01-13 | 2022-04-08 | 广东德冠包装材料有限公司 | Biaxially oriented polypropylene film for epoxy resin curing and preparation method thereof |
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| CN109278389B (en) | 2020-12-08 |
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Address after: 230088 No.1000, Mingchuan Road, high tech Zone, Hefei City, Anhui Province Patentee after: Anhui Guofeng New Material Co.,Ltd. Address before: 230088 No.1000, Mingchuan Road, high tech Zone, Hefei City, Anhui Province Patentee before: ANHUI GUOFENG PLASTIC CO.,LTD. |
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