CN102873951A - Printable biaxially-oriented polypropylene anti-mist film and manufacturing method thereof - Google Patents
Printable biaxially-oriented polypropylene anti-mist film and manufacturing method thereof Download PDFInfo
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- CN102873951A CN102873951A CN2012103802630A CN201210380263A CN102873951A CN 102873951 A CN102873951 A CN 102873951A CN 2012103802630 A CN2012103802630 A CN 2012103802630A CN 201210380263 A CN201210380263 A CN 201210380263A CN 102873951 A CN102873951 A CN 102873951A
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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
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0022—Combinations of extrusion moulding with other shaping operations combined with cutting
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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
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
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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
- B29C2948/92819—Location or phase of control
- B29C2948/92857—Extrusion unit
- B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
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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
- B29C2948/92819—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)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
The invention relates to a printable biaxially-oriented polypropylene anti-mist film and a manufacturing method thereof. The printable biaxially-oriented polypropylene anti-mist film comprises an upper layer, an upper second layer, an intermediate layer, a lower second layer and a lower layer, wherein the upper layer is composed of, by weight, 94-99% of copolymerized polypropylene, 0.5-5% of anti-mist agents and 0.5-2% of anti-blocking agents, the upper second layer is composed of, by weight, 96-99.5% of homopolymerized polypropylene and 0.5-5% of anti-mist agents, the intermediate layer is composed of, by weight, 96-99.5% of homopolymerized polypropylene and 0.5-5% of anti-mist agents, the lower second layer is composed of, by weight, 100% of homopolymerized polypropylene, and the lower layer is composed of, by weight, 98-99.5% of copolymerized polypropylene and 0.5-2.5% of anti-blocking agents. The printable biaxially-oriented polypropylene anti-mist film has excellent transparency, heat-seal strength and excellent anti-mist performance and printing effect, is free of limit by production time in use and can be widely applicable to packaging of vegetable, fruit, meat, frozen food and the like with high water content or large temperature difference in storage.
Description
Technical field
The present invention relates to a kind of printable Biaxially oriented polypropylene antifog film and manufacture method thereof, belong to polymeric material field.
Background technology
Dredge dish, fruit, meat and frozen food, large or the temperature difference is large because of its water content, usually easily in packaging bag, produce the opaque water smoke of one deck, the opaque water smoke of this layer can cause the user to can't see commodity, quality condition that can't the intuitive judgment commodity.In order to address this problem, usually prevent that with having steam from forming the antifog film of tying mist at film surface and packing on the packing.But the biaxial stretching polypropylene film of existing anti-fog function is three-decker, and have following deficiency: 1, antifoggant is added in the intermediate layer, and separate out needs the regular hour fully, produces and can not use at once, the effect of getting well is just arranged after arriving two weeks; 2, after antifoggant is separated out, have a strong impact on the printing of product.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of printable Biaxially oriented polypropylene antifog film and manufacture method thereof are provided, this film not only has good transparency, heat seal strength, good preventing to tie the mist generation, also have simultaneously good printing effect, be not subjected to the restriction of production time in the use.
Printable Biaxially oriented polypropylene antifog film provided by the invention comprises altogether five-layer structure (seeing Figure of description) of upper strata, upper sublevel, middle level, lower sublevel, lower floor, gross thickness 18-50 μ m.Wherein: upper thickness is 0.8-3 μ m, be mixed with by the raw material that contains following weight content: 94-99% COPP, 0.5-5% antifoggant, 0.5-2% antiblocking agent, the composition of antifoggant is polyglyceryl fatty acid ester, and the composition of antiblocking agent is synthetic silica; The thickness of upper sublevel is 2-5 μ m, is mixed with by the raw material that contains following weight content: 96-99.5% HOPP, 0.5-5% antifoggant, and the composition of antifoggant is polyglyceryl fatty acid ester; The thickness in middle level is 5-45 μ m, is mixed with by the raw material that contains following weight content: 96-99.5% HOPP, 0.5-5% antifoggant, and the composition of antifoggant is polyglyceryl fatty acid ester; The thickness of lower sublevel is 2-5 μ m, is mixed with by the raw material that contains following weight content: 100% HOPP; Lower thickness is 1-3 μ m, is mixed with by the raw material that contains following weight content: 98-99.5% COPP, 0.5-2.5% antiblocking agent, the composition of antiblocking agent is synthetic silica.
The present invention also provides a kind of manufacture method of above-mentioned printable Biaxially oriented polypropylene antifog film, and the method is as follows:
(1) adopt biaxial tension equipment to implement, technological process is: prepare burden → extrude → slab → longitudinal stretching → cross directional stretch → rolling.
(2) implementation step
1, batching
Carry out batch mixing in the ratio of setting, batch mixing is batch mixing or equipment batch mixing manually.
2, extrude
Five layers of raw material flow into separately extruder, the extruder effect after through the ratio batch mixings: melting, plasticizing, mixing, equal and quantitative are extruded.Upper strata extruder temperature: 180-230 ℃; Upper sublevel extruder temperature: 210-250 ℃; Middle level extruder temperature: 210-250 ℃; Lower sublevel extruder temperature: 210-250 ℃; Lower floor's extruder temperature: 180-230 ℃.After extruding, five layered materials converge outflow at die head.
3, slab
The effect of slab machine is that the resin that extruder die head flows out is cooled to sheet material, makes degree of crystallinity, the crystal habit of resin, the size of crystal reach perfect condition, thereby improves the physical property of film, is conducive to the stretching of lower operation vertical and horizontal.Slab machine chilling temperature: 20-30 ℃.
4, longitudinal stretching
The effect of longitudinal stretching is that the sheet material of will come from the slab machine carries out preheating, and under certain speed, sheet material is vertically elongated, and polymer molecule is carried out machine-direction oriented.Preheat temperature is best: 100-125 ℃; Draft temperature: 100-125 ℃, stretching ratio: 450-550%;
5, cross directional stretch
The cross directional stretch effect is that the sheet material that longitudinal stretching is come is carried out cross directional stretch by the chain guide of setting at the drawing zone that the larger angle of flare is arranged, and makes equally polymer molecule at horizontal orientation.Preheat temperature is best: 160-180 ℃, preheat temperature is by the output decision of unit interval, and the output high-temperature is high; Draft temperature: 140-165 ℃, setting temperature: 165-175 ℃.Stretching ratio the best is at 800-1100%.
6, sided corona treatment
The effect of sided corona treatment is the energy that radio-frequency generator is produced, and by the bombardment of electronics and ion, makes film surface polarization group, and film surface is activated, thereby increases the surface tension of film, improves printing performance and the adhesive power of film.The two-sided sided corona treatment of carrying out during production.By the power of adjustment radio-frequency generator and the gap of electrode and film, make the wetting tension on upper strata: 35-38 dynes per centimeter, lower floor's wetting tension: 40-42 dynes per centimeter.
7, rolling
The horizontal film that pulls out carries out rolling through the film after cutting edge through winder.Winding process is relevant with the performance of film, can follow according to the rolling situation and set winding tension, attenuation rate, the adjustment of pressure roller pressure, draw ratio 100 ± 2%.
The printable Biaxially oriented polypropylene antifog film that the present invention makes, have the characteristics such as good thickness degree, elastic modelling quantity, hot strength, transparency, heat seal strength, impact resistance, antifog property, impressionability and applicable time span are large, can be used for dredging dish, fruit, meat and Frozen Food Packaging.
The product representative value
Description of drawings
Accompanying drawing is printable Biaxially oriented polypropylene antifog film structural representation of the present invention
Among the figure
1,1 is the upper strata; 2,2 is upper sublevel; 3, the 3rd, the middle level; 4, the 4th, lower sublevel; 5, the 5th, lower floor.
Implementation
Following specific embodiment is described further printable Biaxially oriented polypropylene antifog film of the present invention and manufacture method thereof.
Embodiment one
Batching: produce thickness 20 μ m films.Upper bed thickness 1.5 μ m, wherein COPP content is 97.5%, polyglyceryl fatty acid ester 1.5%, synthetic silica 1%; Last time bed thickness 4 μ m, wherein HOPP 98.5%, polyglyceryl fatty acid ester 1.5%; Middle bed thickness 9 μ m, wherein HOPP 98.5%, polyglyceryl fatty acid ester 1.5%; Next bed thickness 4 μ m, HOPP 100%; Lower bed thickness 1.5 μ m, wherein COPP content is 99%, synthetic silica 1%.
Masking: adopt co-extruding biaxial stretched technique to make the antifog film that prints of the present invention, it is 190 ℃ of extruder temperatures, upper sublevel extruder temperature at the middle and upper levels: 220 ℃, the middle level extruder temperature: 220 ℃, lower sublevel extruder temperature: 220 ℃, lower floor's extruder temperature: 190 ℃; Slab machine temperature: 20 ℃; The longitudinal stretching multiplying power: 490%, the vertical preheat temperature of drawing: 110 ℃, the vertical draft temperature that draws: 110 ℃; The cross directional stretch multiplying power: 900%, the horizontal preheat temperature of drawing: 160 ℃, the horizontal draft temperature that draws: 145 ℃, the horizontal setting temperature that draws: 165 ℃; Rolling draw ratio: 100%.
Embodiment 2
Batching: produce thickness 18 μ m films.Upper bed thickness 0.8 μ m, wherein COPP content is 96%, polyglyceryl fatty acid ester 3%, synthetic silica 1%; Last time bed thickness 2 μ m, wherein HOPP 97%, polyglyceryl fatty acid ester 3%; Middle bed thickness 12 μ m, wherein HOPP 97%, polyglyceryl fatty acid ester 3%; Next bed thickness 2 μ m, HOPP 100%; Lower bed thickness 1.2 μ m, wherein COPP content is 98%, synthetic silica 2%.
Masking: adopt co-extruding biaxial stretched technique to make the antifog film that prints of the present invention, it is extruder temperature at the middle and upper levels: 185 ℃, upper sublevel extruder temperature: 210 ℃, the middle level extruder temperature: 210 ℃, lower sublevel extruder temperature: 210 ℃, lower floor's extruder temperature: 185 ℃; Slab machine temperature: 22 ℃; The longitudinal stretching multiplying power: 515%, the vertical preheat temperature of drawing: 105 ℃, the vertical draft temperature that draws: 105 ℃; The cross directional stretch multiplying power: 920%, the horizontal preheat temperature of drawing: 160 ℃, the horizontal draft temperature that draws: 145 ℃, the horizontal setting temperature that draws: 165 ℃; Rolling draw ratio: 100%.
Embodiment 3
Batching: produce thickness 22 μ m films.Upper bed thickness 1.5 μ m, wherein COPP content is 97%, polyglyceryl fatty acid ester 2.0%, synthetic silica 1%; Last time bed thickness 3 μ m, wherein HOPP 98%, polyglyceryl fatty acid ester 2%; Middle bed thickness 13 μ m, wherein HOPP 98%, polyglyceryl fatty acid ester 2%; Next bed thickness 3 μ m, HOPP 100%; Lower bed thickness 1.5 μ m, wherein COPP content is 99%, synthetic silica 1%.
Masking: adopt co-extruding biaxial stretched technique to make the antifog film that prints of the present invention, it is extruder temperature at the middle and upper levels: 200 ℃, upper sublevel extruder temperature: 230 ℃, the middle level extruder temperature: 230 ℃, lower sublevel extruder temperature: 230 ℃, lower floor's extruder temperature: 200 ℃; Slab machine temperature: 25 ℃; The longitudinal stretching multiplying power: 500%, the vertical preheat temperature of drawing: 115 ℃, the vertical draft temperature that draws: 110 ℃; The cross directional stretch multiplying power: 950%, the horizontal preheat temperature of drawing: 171 ℃, the horizontal draft temperature that draws: 152 ℃, the horizontal setting temperature that draws: 170 ℃; Rolling draw ratio: 100%.
Embodiment 4
Batching: produce thickness 30 μ m films.Upper bed thickness 2 μ m, wherein COPP content is 98%, polyglyceryl fatty acid ester 1%, synthetic silica 1%; Last time bed thickness 4 μ m, wherein HOPP 99%, polyglyceryl fatty acid ester 1%; Middle bed thickness 18 μ m, wherein HOPP 99%, polyglyceryl fatty acid ester 1%; Next bed thickness 4 μ m, HOPP 100%; Lower bed thickness 2 μ m, wherein COPP content is 99%, synthetic silica 1%.
Masking: adopt co-extruding biaxial stretched technique to make the antifog film that prints of the present invention, it is extruder temperature at the middle and upper levels: 222 ℃, upper sublevel extruder temperature: 237 ℃, the middle level extruder temperature: 237 ℃, lower sublevel extruder temperature: 237 ℃, lower floor's extruder temperature: 224 ℃; Slab machine temperature: 23 ℃; The longitudinal stretching multiplying power: 495%, the vertical preheat temperature of drawing: 120 ℃, the vertical draft temperature that draws: 110 ℃; The cross directional stretch multiplying power: 940%, the horizontal preheat temperature of drawing: 173 ℃, the horizontal draft temperature that draws: 165 ℃, the horizontal setting temperature that draws: 172 ℃; Rolling draw ratio: 100%.
Embodiment 5
Batching: produce thickness 40 μ m films.Upper bed thickness 3 μ m, wherein COPP content is 99%, polyglyceryl fatty acid ester 0.5%, synthetic silica 0.5%; Last time bed thickness 5 μ m, wherein HOPP 99.5%, polyglyceryl fatty acid ester 0.5%; Middle bed thickness 25 μ m, wherein HOPP 99.5%, polyglyceryl fatty acid ester 0.5%; Next bed thickness 5 μ m, HOPP 100%; Lower bed thickness 2 μ m, wherein COPP content is 99.5%, synthetic silica 0.5%.
Masking: adopt co-extruding biaxial stretched technique to make the antifog film that prints of the present invention, it is extruder temperature at the middle and upper levels: 225 ℃, upper sublevel extruder temperature: 245 ℃, the middle level extruder temperature: 245 ℃, lower sublevel extruder temperature: 245 ℃, lower floor's extruder temperature: 225 ℃; Slab machine temperature: 20 ℃; The longitudinal stretching multiplying power: 510%, the vertical preheat temperature of drawing: 125 ℃, the vertical draft temperature that draws: 115 ℃; The cross directional stretch multiplying power: 890%, the horizontal preheat temperature of drawing: 178 ℃, the horizontal draft temperature that draws: 165 ℃, the horizontal setting temperature that draws: 175 ℃; Rolling draw ratio: 100%.
Claims (6)
1. printable Biaxially oriented polypropylene antifog film, it is characterized in that: described film comprises altogether five-layer structure of upper strata, upper sublevel, middle level, lower sublevel, lower floor, and it is mixed with by the raw material that contains following weight content at the middle and upper levels: 94-99% COPP, 0.5-5% antifoggant, 0.5-2% antiblocking agent; Upper sublevel is mixed with by the raw material that contains following weight content: 96-99.5% HOPP, 0.5-5% antifoggant; The middle level is mixed with by the raw material that contains following weight content: 96-99.5% HOPP, 0.5-5% antifoggant; Lower sublevel is mixed with by the raw material that contains following weight content: 100% HOPP; Lower floor is mixed with by the raw material that contains following weight content: 98-99.5% COPP, 0.5-2.5% antiblocking agent.
2. printable Biaxially oriented polypropylene antifog film as claimed in claim 1, it is characterized in that: the composition of described antifoggant is polyglyceryl fatty acid ester.
3. printable Biaxially oriented polypropylene antifog film as claimed in claim 1 or 2, it is characterized in that: the composition of described antiblocking agent is synthetic silica.
4. such as described any one the printable Biaxially oriented polypropylene antifog film of claim 1-3, it is characterized in that: described overall film thickness is 18-50 μ m, wherein upper thickness is 0.8-3 μ m, last time, layer thickness was 2-5 μ m, intima-media thickness is 5-45 μ m, the thickness of lower sublevel is 2-5 μ m, and lower thickness is 1-3 μ m.
5. the manufacture method of printable Biaxially oriented polypropylene antifog film as claimed in claim 1, it is characterized in that the method comprise the steps: to prepare burden → extrude → slab → longitudinal stretching → cross directional stretch → rolling; Specific practice is:
(1) batching
Ratio in above-mentioned setting is carried out batch mixing, and batch mixing is batch mixing or equipment batch mixing manually;
(2) extrude
Above-mentioned five layers of raw material flow into separately extruder after through the ratio batch mixing, and melting, plasticizing, mixing, equal and quantitative are extruded, and it is extruder temperature at the middle and upper levels: 180-230 ℃; Upper sublevel extruder temperature: 210-250 ℃; Middle level extruder temperature: 210-250 ℃; Lower sublevel extruder temperature: 210-250 ℃; Lower floor's extruder temperature: 180-230 ℃;
(3) slab
The resin that above-mentioned extruder die head is flowed out is cooled to sheet material, slab machine chilling temperature: 20-30 ℃;
(4) longitudinal stretching
To carry out preheating from the sheet material that above-mentioned slab machine is come, and under certain speed, sheet material vertically be elongated, and polymer molecule be carried out machine-direction oriented, preheat temperature is 100-125 ℃; Draft temperature is 100-125 ℃, and stretching ratio is 450-550%;
(5) cross directional stretch
Above-mentioned sheet material of coming through longitudinal stretching is carried out cross directional stretch by the chain guide of setting at the drawing zone that the larger angle of flare is arranged, preheat temperature is 160-180 ℃, draft temperature is 140-165 ℃, and setting temperature is 165-175 ℃, and stretching ratio is 800-1100%:
(6) rolling
Out film behind the above-mentioned cross directional stretch is carried out rolling through cutting edge with winder, and draw ratio is 100 ± 2%.
6. the manufacture method of printable Biaxially oriented polypropylene antifog film as claimed in claim 5, it is characterized in that: a face or two faces to film before the rolling step carry out sided corona treatment.
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| CN2012103802630A CN102873951A (en) | 2012-09-18 | 2012-09-18 | Printable biaxially-oriented polypropylene anti-mist film and manufacturing method thereof |
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| CN2012103802630A CN102873951A (en) | 2012-09-18 | 2012-09-18 | Printable biaxially-oriented polypropylene anti-mist film and manufacturing method thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103707603A (en) * | 2013-12-31 | 2014-04-09 | 浙江凯利新材料股份有限公司 | Double-face heat-sealed and anti-fogging type BOPP (biaxially-oriented polypropylene) film and preparation method thereof |
| CN104260525A (en) * | 2014-09-25 | 2015-01-07 | 海南赛诺实业有限公司 | Biaxially-oriented polypropylene anti-mist film with five-layer coextrusion and manufacturing method thereof |
| CN106113839A (en) * | 2016-07-15 | 2016-11-16 | 黄山永新股份有限公司 | A kind of fruit and vegerable salad packaging composite film and production technology thereof |
| WO2019056414A1 (en) * | 2017-09-19 | 2019-03-28 | 江阴申隆包装材料有限公司 | Easy-to-cut, high-barrier and anti-fog cover film, and manufacturing method therefor |
| CN112625357A (en) * | 2019-09-24 | 2021-04-09 | 上海如夏新材料技术有限公司 | High-transparency anti-fog polypropylene material and preparation process thereof |
| CN112622388A (en) * | 2019-09-24 | 2021-04-09 | 上海如夏新材料技术有限公司 | Polypropylene sheet material with multilayer co-extrusion structure |
| CN116176081A (en) * | 2022-12-19 | 2023-05-30 | 广东开放大学（广东理工职业学院） | Biaxially oriented polypropylene waterproof film and preparation method thereof |
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| CN106113839A (en) * | 2016-07-15 | 2016-11-16 | 黄山永新股份有限公司 | A kind of fruit and vegerable salad packaging composite film and production technology thereof |
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| CN112625357A (en) * | 2019-09-24 | 2021-04-09 | 上海如夏新材料技术有限公司 | High-transparency anti-fog polypropylene material and preparation process thereof |
| CN112622388A (en) * | 2019-09-24 | 2021-04-09 | 上海如夏新材料技术有限公司 | Polypropylene sheet material with multilayer co-extrusion structure |
| CN116176081A (en) * | 2022-12-19 | 2023-05-30 | 广东开放大学（广东理工职业学院） | Biaxially oriented polypropylene waterproof film and preparation method thereof |
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