CN103009753B - PET for aseptic packaging sealing extrudes composite and preparation method thereof - Google Patents
PET for aseptic packaging sealing extrudes composite and preparation method thereof Download PDFInfo
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Abstract
The invention provides a kind of PET for aseptic packaging sealing and extrude composite, described PET extrudes composite and is composited by MLLDPE+LDPE compound tree lipid layer, LDPE resin bed, silane coupling agent or polyurethane adhesive water layer, PET film layer, silane coupling agent or polyurethane adhesive water layer, LDPE resin bed, MLLDPE+LDPE compound tree lipid layer from top to bottom.This PET extrudes that the fracture elongation of composite is low, intensity is high, has good cut-out performance, dimensional stability, oxygen barrier and water preventing ability.Present invention also offers the preparation method that the above-mentioned PET for aseptic packaging sealing extrudes composite.The PET that the present invention's coextrusion complex method is processed into 7 layers of symmetrical structure extrudes composite for the production of the sealing of the aseptic packaging material paper end face of paper aluminium MULTILAYER COMPOSITE and the sealing up and down between horizontal sealing packaging material.
Description
Technical field
The present invention relates to encapsulant, be specifically related to a kind of PET for aseptic packaging sealing and extrude composite and preparation method thereof.
Background technology
The feature that paper aluminium liquid asepsis packaging material sealing strip has that initial heat-sealing temperature is low, peel strength does not decline after sealing, barrier and rigidity, particularly soaked with liquid.Along with the development of domestic paper aluminium liquid asepsis packaging, improving constantly of canning line packaging speed, the sealing strip of nylon co-extrusion film production domestic is at present owing to easily stretching and cutting off the shortcomings such as poor performance, well can not adapt on high-speed canning equipment and pillow type packaging, use certain limitation.
CN101115618A discloses a kind of band manufacture method and band of that be suitable for liquid food container strip tape, cheap barrier properties for gases excellence.Strip tape comprises: the intermediate layer comprising oriented polyester film; The banded film of the ethylene-vinyl alcohol copolymer be coated on interlayer surfaces, forming in the lateral center band domain of strip tape, the both sides band domain of film formed without film band domain; With the heat sealability outermost layer of low density polyethylene (LDPE) etc.
CN200995872Y discloses a kind of paper aluminium plastic composite material sealing strip, and sealing bar is made up of film layer, adhesive phase, biaxially oriented laminated polyester film, adhesive phase, film layer coetrusion compound.Polyethylene film is double-layer coextrusion polyethylene film.Sealing bar has good Low Temperature Thermal involution, acid-alkali-corrosive-resisting, high obstructing performance; Under different liquid (water, fruit juice, milk) soaks, still can keep higher peel strength, solve the sealing strip problem that peel strength declines when soaked with liquid that dry type compound occurs to produce, ensure that the performance of packaging; The raising of tensile property, can extensively be adapted at various packaging facilities uses.
Above-mentioned patent application only improves to some extent in hot strength or peel strength, but its combination property still has much room for improvement.Therefore, research and develop and a kind ofly in use not easily to stretch, easily cut off and there is the novel sealing strip of good heat sealability, reliably sealing and medium-resistance, for domestic production enterprise provides more option, have great importance.
In view of this, special proposition the present invention.
Summary of the invention
The first object of the present invention is to provide a kind of PET for aseptic packaging sealing to extrude composite, and this PET extrudes that the fracture elongation of composite is low, intensity is high, has good cut-out performance, dimensional stability, oxygen barrier and water preventing ability.
The second object of the present invention is to provide above-mentioned PET to extrude the preparation method of composite.
In order to realize object of the present invention, the following technical scheme of special employing:
PET for aseptic packaging sealing extrudes a composite, and described PET extrudes composite and is composited by MLLDPE+LDPE compound tree lipid layer, LDPE resin bed, silane coupling agent or polyurethane adhesive water layer, PET film layer, silane coupling agent or polyurethane adhesive water layer, LDPE resin bed, MLLDPE+LDPE compound tree lipid layer from top to bottom.
Be compared with the encapsulant produced of the coextrusion film blowing method of base material or the encapsulant that is combined into by polyethylene film, adhesive phase and laminated polyester film dry type with nylon with of the prior art, it is 7 layers of design that PET for aseptic packaging sealing provided by the invention extrudes composite, the top layer that PET extrudes composite is MLLDPE and LDPE compound tree lipid layer, can provide good heat sealability, heat seal strength when 110 DEG C is greater than 10N/15mm; Secondary top layer LDPE layer and top layer have good compatibility, have good bonding strength with priming coat or polyurethane adhesive water layer under temperature and pressure effect simultaneously; Priming coat, polyurethane glue-line provide good medium-resistance for composite sheet; PET film layer is the effect that the base material of whole sheet material plays skeleton.
As well known to those skilled in the art, PET extrudes the difference of the structure of composite and the difference of every layer of material adopted will greatly affect the performance of encapsulant.Inventor is by the structural design of 7 layers and 7 Rotating fields features PET being extruded composite combine, consider simultaneously the compatibility of the material between adjacent layer with material property, by a large amount of performing creative labours, the PET of final acquisition extrudes that the fracture elongation of composite is low, intensity is high, there is good cut-out performance, suitable machine performance is better, is suitable for high speed bottling line and aseptic pillow type packaging; In addition, PET extrudes composite and has excellent low-temperature heat-sealing performance and heat resistance, avoids the deformation retract of film when the heating of use procedure medium-high frequency or hot plate heating, has good dimensional stability; Secondly, this PET extrudes composite and also has good resistance oxygen and block-water performance, and internal filling food plays effective protective effect.
In described MLLDPE+LDPE compound tree lipid layer, the content of MLLDPE is 0 ~ 100%, is preferably 10 ~ 90%, is more preferably and is preferably 30 ~ 70%.
MLLDPE can reduce heat-sealing temperature and have anti-sealing pollutant performance, and acidic beverages as fruit juice etc. or neutral beverage as milk and other liquid type food in there is very high stability; And LDPE add can improve heat-sealing temperature range, effectively improve heat sealability; The present invention is by the proportioning of reasonably optimizing MLLDPE and LDPE, and this MLLDPE+LDPE compound tree lipid layer has lower playing envelope temperature, excellent heat sealability and seal antifouling property, the reliability of sealing when effectively improve filling and filling speed.
The melt index of described MLLDPE+LDPE hybrid resin is 4.5 ~ 20 grams/10min, and be preferably 4.5-15 gram/10min, be more preferably 4.5-7.5 gram/10min, extrusion resin temperature is 250 ~ 350 DEG C.Inventor extrudes in the process of composite at preparation PET, when the melt index of discovery MLLDPE+LDPE hybrid resin is 4.5 ~ 20 grams/10min, extrusion temperature is 250 ~ 350 DEG C, described MLLDPE+LDPE hybrid resin has wider heat-sealing scope, and can process industrial art performance be improved, obtain stable laminated film.
The one side coating weight of described MLLDPE+LDPE compound tree lipid layer is 10 ~ 20 grams/m, is conducive to making PET extrude composite and obtains good dimensional stability and heat sealability firmly.
Described MLLDPE is metallocene catalysis LLDPE.
The melt index of described LDPE is 4.5 ~ 20 grams/10min, and be preferably 4.5-15 gram/10min, be more preferably 4.5-7.5 gram/10min, extrusion resin temperature is 250 ~ 350 DEG C.Within the scope of this, LDPE layer has wider heat-sealing scope, and can improve process industrial art performance, obtains stable laminated film.
The one side coating weight of described LDPE is 10 ~ 20 grams/m, is conducive to making PET extrude composite and obtains good dimensional stability and heat sealability.
The spread of described silane coupling agent or polyurethane adhesive water layer is 0.3 ~ 1.5g/m
2, the PET being conducive to obtaining firmly combined strength bination and excellent medium-resistance extrudes composite.
The thickness of described PET film layer is 10-15 μm.PET film is the base material of whole composite, the rigidity providing PET to extrude composite and the barrier property to oxygen, water; Under the PET film of biaxial tension simultaneously has good tensile strength and cuts off performance and high temperature, the low-shrinkage of PET film, gives the low-shrinkage of the good heat resistance of composite membrane and bar, makes PET extrude composite and have good suitable machine performance.
The physicochemical property parameter that PET provided by the invention extrudes composite is: hot strength is 40-50Mpa, elongation at break is 100-200%, peel strength >=5N/15mm, heat seal strength (115 DEG C ~ 150 DEG C) >=30N/15mm, OTR oxygen transmission rate≤100cc/m2.24hr, water vapour permeability≤10g/m2.24hr, BOPET base material percent thermal shrinkage (MD, 150 DEG C, 30min)≤1.8mm, BOPET base material percent thermal shrinkage (TD, 150 DEG C, 30min)≤0.3mm.
The PET that the present invention's coextrusion complex method is processed into 7 layers of symmetrical structure extrudes the sealing of composite for the production of the aseptic packaging material paper end face of paper aluminium MULTILAYER COMPOSITE.
Foregoing PET extrudes a preparation method for composite, comprises the steps:
(1) PET film is coated with silane coupling agent or polyurethane glue after surface corona process, dry, baking temperature is 50-100 DEG C;
(2) with coextrusion compounding machine successively by LDPE resin and the coextrusion of MLLDPE+LDPE hybrid resin in the gluing face of PET film, rolling after compound roll-in and chill roll pressing;
(3) film slaking, curing temperature is 30-80 DEG C, and the curing time is 2-7 days;
(4) another side of PET is repeated to the technique of above-mentioned steps (1), (2), (3).
Preferably, in described step (3), curing temperature is 40-70 DEG C, and the curing time is 3-5 days.
By obtained finished product according to customer requirement, cut into the strip form film bar of specific width, be coiled into the plate-like film tape of specific standard for client.
Preparation method's technique of the present invention is simple, easy to operate, be easy to suitability for industrialized production, it is strong that obtained PET extrudes composite stability, there is good low-temperature heat-sealing performance and wide heat-sealing temperature scope, can water-fast, milk, fruit juice or other liquid food containing ethanol.
Compared with prior art, beneficial effect of the present invention is:
(1) PET extrudes that the fracture elongation of composite is low, intensity is high, has good cut-out performance, and suitable machine performance is better, is suitable for high speed bottling line and aseptic pillow type packaging;
(2) excellent low-temperature heat-sealing performance, heat resistance and low percent thermal shrinkage, avoid the deformation retract of film when the heating of use procedure medium-high frequency or hot plate heating, have good dimensional stability;
(3) good resistance oxygen and block-water performance, internal filling food plays effective protective effect.
Accompanying drawing explanation
Fig. 1 extrudes the structural representation of composite for PET that the embodiment of the present invention 1 provides;
Wherein: 1-metallocene catalysis LLDPE and low density polyethylene (LDPE) compound tree lipid layer (MLLDPE+LDPE);
2-ldpe resin layer (LDPE);
3-silane coupling agent or polyurethane adhesive water layer (PRIMER/ADHESIVE);
4-laminated polyester film (PET);
5-silane coupling agent or polyurethane adhesive water layer (PRIMER/ADHESIVE);
6-ldpe resin layer (LDPE);
7-metallocene catalysis LLDPE and low density polyethylene (LDPE) compound tree lipid layer (MLLDPE+LDPE).
Detailed description of the invention
By embodiment, technical scheme of the present invention is further described below; advantage to technical scheme of the present invention will be contributed to; effect has further to be understood, and embodiment does not limit protection scope of the present invention, and protection scope of the present invention is decided by claim.
Embodiment 1
PET film is coated with silane coupling agent after surface corona process, and the thickness of PET film is 10 μm, and the spread of described silane coupling agent or polyurethane adhesive water layer is 0.3g/m
2.Drying, baking temperature is 50 DEG C; With coextrusion compounding machine successively by LDPE resin and the coextrusion of MLLDPE+LDPE hybrid resin in the gluing face of PET film, the melt index of described LDPE is 4.5 grams/10min, extrusion resin temperature is 250 DEG C, and the one side coating weight of described LDPE is 10 grams/m; In described MLLDPE+LDPE hybrid resin, the content of MLLDPE is 0%, the melt index of described MLLDPE+LDPE hybrid resin is 4.5 grams/10min, extrusion resin temperature is 250 DEG C, and the one side coating weight of described MLLDPE+LDPE compound tree lipid layer is 10 grams/m.Rolling after compound roll-in and chill roll pressing; Film slaking, curing temperature is 30 DEG C, and the curing time is 7 days; Above-mentioned technique is repeated to the another side of PET.
The physicochemical property parameter that PET extrudes composite is: thickness 78 μm, and hot strength is 40Mpa, and elongation at break is 200%, peel strength is 5N/15mm, heat seal strength (115 DEG C ~ 150 DEG C) is 30N/15mm, and OTR oxygen transmission rate is 100cc/m2.24hr, and water vapour permeability is 8g/m2.24hr, BOPET base material percent thermal shrinkage (MD, 150 DEG C, 30min) be 1.8mm, BOPET base material percent thermal shrinkage (TD, 150 DEG C, 30min) be 0.3mm.
Embodiment 2
PET film is coated with polyurethane glue after surface corona process, and the thickness of PET film is 15 μm, and the spread of described silane coupling agent or polyurethane adhesive water layer is 1.5g/m
2.Drying, baking temperature is 100 DEG C; With coextrusion compounding machine successively by LDPE resin and the coextrusion of MLLDPE+LDPE hybrid resin in the gluing face of PET film, the melt index of described LDPE is 15 grams/10min, and extrusion resin temperature is 350 DEG C, and the one side coating weight of described LDPE is 20 grams/m; In MLLDPE+LDPE hybrid resin, the content of MLLDPE is 100%, and the melt index of described MLLDPE+LDPE hybrid resin is 20 grams/10min, and extrusion resin temperature is 350 DEG C; The one side coating weight of described MLLDPE+LDPE compound tree lipid layer is 20 grams/m; .Rolling after compound roll-in and chill roll pressing; Film slaking, curing temperature is 80 DEG C, and the curing time is 2 days; Above-mentioned technique is repeated to the another side of PET.
The physicochemical property parameter that PET extrudes composite is: thickness 82 μm, and hot strength is 45Mpa, and elongation at break is 150%, peel strength is 5N/15mm, heat seal strength (115 DEG C ~ 150 DEG C) is 32N/15mm, and OTR oxygen transmission rate is 100cc/m2.24hr, and water vapour permeability is 10g/m2.24hr, BOPET base material percent thermal shrinkage (MD, 150 DEG C, 30min) be 1.8mm, BOPET base material percent thermal shrinkage (TD, 150 DEG C, 30min) be 0.25mm.
Embodiment 3
PET film is coated with silane coupling agent after surface corona process, and the thickness of PET film is 12 μm, and the spread of described silane coupling agent or polyurethane adhesive water layer is 0.5g/m
2.Drying, baking temperature is 80 DEG C; With coextrusion compounding machine successively by LDPE resin and the coextrusion of MLLDPE+LDPE hybrid resin in the gluing face of PET film, the melt index of described LDPE is 7.5 grams/10min, extrusion resin temperature is 300 DEG C, and the one side coating weight of described LDPE is 15 grams/m; In MLLDPE+LDPE hybrid resin, the content of MLLDPE is 30%, and the melt index of described MLLDPE+LDPE hybrid resin is 15 grams/10min, and extrusion resin temperature is 300 DEG C; The one side coating weight of described MLLDPE+LDPE compound tree lipid layer is 15 grams/m.Rolling after compound roll-in and chill roll pressing; Film slaking, curing temperature is 50 DEG C, and the curing time is 5 days; Above-mentioned technique is repeated to the another side of PET.
The physicochemical property parameter that PET extrudes composite is: thickness 80 μm, and hot strength is 47Mpa, and elongation at break is 180%, peel strength is 8N/15mm, heat seal strength (115 DEG C ~ 150 DEG C) is 40N/15mm, and OTR oxygen transmission rate is 100cc/m2.24hr, and water vapour permeability is 7g/m2.24hr, BOPET base material percent thermal shrinkage (MD, 150 DEG C, 30min) be 1.6mm, BOPET base material percent thermal shrinkage (TD, 150 DEG C, 30min) be 0.3mm.
Embodiment 4
PET film is coated with silane coupling agent after surface corona process, and the thickness of PET film is 14 μm, and the spread of described silane coupling agent or polyurethane adhesive water layer is 1.0g/m
2.Drying, baking temperature is 90 DEG C; With coextrusion compounding machine successively by LDPE resin and the coextrusion of MLLDPE+LDPE hybrid resin in the gluing face of PET film, the melt index of described LDPE is 6 grams/10min, and extrusion resin temperature is 280 DEG C; The one side coating weight of described LDPE is 18 grams/m.In MLLDPE+LDPE hybrid resin, the content of MLLDPE is 70%, and the melt index of described MLLDPE+LDPE hybrid resin is 10 grams/10min, and extrusion resin temperature is 280 DEG C; The one side coating weight of described MLLDPE+LDPE compound tree lipid layer is 15 grams/m; Rolling after compound roll-in and chill roll pressing; Film slaking, curing temperature is 60 DEG C, and the curing time is 3 days; Above-mentioned technique is repeated to the another side of PET.
The physicochemical property parameter that PET extrudes composite is: thickness 81 μm, and hot strength is 50Mpa, and elongation at break is 150%, peel strength is 6N/15mm, heat seal strength (115 DEG C ~ 150 DEG C) is 35N/15mm, and OTR oxygen transmission rate is 90cc/m2.24hr, and water vapour permeability is 7g/m2.24hr, BOPET base material percent thermal shrinkage (MD, 150 DEG C, 30min) be 1.8mm, BOPET base material percent thermal shrinkage (TD, 150 DEG C, 30min) be 0.3mm.
Embodiment 5
PET film is coated with silane coupling agent after surface corona process, and the thickness of PET film is 11 μm, and the spread of described silane coupling agent or polyurethane adhesive water layer is 0.5g/m
2.Drying, baking temperature is 80 DEG C; With coextrusion compounding machine successively by LDPE resin and the coextrusion of MLLDPE+LDPE hybrid resin in the gluing face of PET film, the melt index of described LDPE is 7.5 grams/10min, extrusion resin temperature is 300 DEG C, and the one side coating weight of described LDPE is 15 grams/m; In MLLDPE+LDPE hybrid resin, the content of MLLDPE is 10%, and the melt index of described MLLDPE+LDPE hybrid resin is 15 grams/10min, and extrusion resin temperature is 300 DEG C; The one side coating weight of described MLLDPE+LDPE compound tree lipid layer is 15 grams/m.Rolling after compound roll-in and chill roll pressing; Film slaking, curing temperature is 40 DEG C, and the curing time is 5 days; Above-mentioned technique is repeated to the another side of PET.
The physicochemical property parameter that PET extrudes composite is: thickness 79 μm, and hot strength is 44Mpa, and elongation at break is 190%, peel strength is 7N/15mm, heat seal strength (115 DEG C ~ 150 DEG C) is 35N/15mm, and OTR oxygen transmission rate is 95cc/m2.24hr, and water vapour permeability is 6g/m2.24hr, BOPET base material percent thermal shrinkage (MD, 150 DEG C, 30min) be 1.6mm, BOPET base material percent thermal shrinkage (MD, 150 DEG C, 30min) be 0.2mm.
Embodiment 6
PET film is coated with silane coupling agent after surface corona process, and the thickness of PET film is 13 μm, and the spread of described silane coupling agent or polyurethane adhesive water layer is 1.0g/m
2.Drying, baking temperature is 90 DEG C; With coextrusion compounding machine successively by LDPE resin and the coextrusion of MLLDPE+LDPE hybrid resin in the gluing face of PET film, the melt index of described LDPE is 20 grams/10min, and extrusion resin temperature is 280 DEG C; The one side coating weight of described LDPE is 18 grams/m.In MLLDPE+LDPE hybrid resin, the content of MLLDPE is 90%, and the melt index of described MLLDPE+LDPE hybrid resin is 7.5 grams/10min, and extrusion resin temperature is 280 DEG C; The one side coating weight of described MLLDPE+LDPE compound tree lipid layer is 15 grams/m; Rolling after compound roll-in and chill roll pressing; Film slaking, curing temperature is 70 DEG C, and the curing time is 4 days; Above-mentioned technique is repeated to the another side of PET.
The physicochemical property parameter that PET extrudes composite is: thickness 81 μm, and hot strength is 48Mpa, and elongation at break is 170%, peel strength is 6N/15mm, heat seal strength (115 DEG C ~ 150 DEG C) is 30N/15mm, and OTR oxygen transmission rate is 90cc/m2.24hr, and water vapour permeability is 5g/m2.24hr, BOPET base material percent thermal shrinkage (MD, 150 DEG C, 30min) be 1.5mm, BOPET base material percent thermal shrinkage (MD, 150 DEG C, 30min) be 0.3mm.
In various embodiments of the present invention, the detection method of property indices is as follows:
Thickness: GB/T6672-2001ISO4592);
Hot strength: GB/T13022-1991ASTMD882;
Elongation at break: GB/T13022-1991ASTMD882;
Peel strength: GB/T8808-1998;
Heat seal strength (115 DEG C ~ 150 DEG C): ASTMD2029;
OTR oxygen transmission rate: GB/T19789-2005; ASTMD3985
Water vapour permeability: GB/T26253-2010; ISO-15106-2-2003
BOPET base material percent thermal shrinkage (150 DEG C, 30min): ASTMD1204
Experimental example 1
This experimental example compared for the physicochemical property parameter that PET of the present invention extrudes composite and two kinds of encapsulants of the prior art, and detection method is identical with the detection method that PET in embodiment extrudes composite, the results are shown in Table 1.
Reference substance 1 is the sealing strip adopting the method in patent application CN200620093230.8 in detailed description of the invention to prepare;
Reference substance 2 is the strip tape adopting the method for embodiment 1 in patent application CN200580044747.6 to prepare;
Table 1
Known by table 1, the thickness of reference substance is suitable with thickness of the present invention, the product of the hot strength of reference substance and peel strength and embodiments of the invention is suitable, but other performance parameter of the present invention is all better than reference substance, and the combination property of product prepared by the present invention is more excellent.
Claims (10)
1. extrude composite for the PET of aseptic packaging sealing for one kind, it is characterized in that, described PET extrudes composite from top to bottom by MLLDPE+LDPE compound tree lipid layer, LDPE resin bed, silane coupling agent or polyurethane adhesive water layer, biaxial tension PET film layer, silane coupling agent or polyurethane adhesive water layer, LDPE resin bed, MLLDPE+LDPE compound tree lipid layer is composited, the melt index of described LDPE is 4.5 ~ 20 grams/10min, in described MLLDPE+LDPE compound tree lipid layer, the content of MLLDPE is 10 ~ 100%, the one side coating weight of described MLLDPE+LDPE compound tree lipid layer is 10 ~ 20 grams/m, the spread of described silane coupling agent or polyurethane adhesive water layer is 0.3 ~ 1.5g/m
2.
2. PET according to claim 1 extrudes composite, it is characterized in that, in described MLLDPE+LDPE compound tree lipid layer, the content of MLLDPE is 30 ~ 70%.
3. PET according to claim 1 and 2 extrudes composite, it is characterized in that, the melt index of described MLLDPE+LDPE hybrid resin is 4.5 ~ 20 grams/10min.
4. PET according to claim 3 extrudes composite, it is characterized in that, the melt index of described MLLDPE+LDPE hybrid resin is 4.5-15 gram/10min, and extrusion resin temperature is 250 ~ 350 DEG C.
5. PET according to claim 1 extrudes composite, it is characterized in that, the melt index of described LDPE is 4.5 ~ 15 grams/10min, and extrusion resin temperature is 250 ~ 350 DEG C.
6. PET extrudes composite according to claim 1 or 5, it is characterized in that, the one side coating weight of described LDPE is 10 ~ 20 grams/m.
7. PET according to claim 6 extrudes composite, it is characterized in that, the spread of described silane coupling agent or polyurethane adhesive water layer is 0.5-1.0g/m
2.
8. PET according to claim 1 extrudes composite, it is characterized in that, the thickness of described biaxial tension PET film layer is 10-15 μm.
9. the PET described in claim 1-8 any one extrudes a preparation method for composite, it is characterized in that, comprises the steps:
(1) biaxial tension PET film is coated with silane coupling agent or polyurethane glue after surface corona process, dry, baking temperature is 50-100 DEG C;
(2) with coextrusion compounding machine successively by LDPE resin and the coextrusion of MLLDPE+LDPE hybrid resin in the gluing face of biaxial tension PET film, rolling after compound roll-in and chill roll pressing;
(3) film slaking, curing temperature is 30-80 DEG C, and the curing time is 2-7 days;
(4) another side of PET is repeated to the technique of above-mentioned steps (1), (2), (3).
10. preparation method according to claim 9, is characterized in that, in described step (3), curing temperature is 40-70 DEG C, and the curing time is 3-5 days.
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| SE542945C2 (en) * | 2018-10-03 | 2020-09-22 | Stora Enso Oyj | Polymer coated paper and paperboard |
| CN109605881B (en) * | 2018-11-29 | 2020-08-07 | 烟台丰福莱薄膜科技有限公司 | Sealing film for UHT paper aluminum plastic liquid packaging material and preparation method thereof |
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| CN112078197A (en) * | 2020-09-16 | 2020-12-15 | 上海万封新材料技术有限公司 | High-oxygen-resistance sealing strip with co-extruded EVOH film as base material and preparation method thereof |
| CN112590341B (en) * | 2020-12-14 | 2022-06-21 | 升辉新材料股份有限公司 | Recyclable high-barrier composite sheet with high composite strength and preparation method thereof |
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|---|---|---|---|---|
| CN102380996A (en) * | 2011-08-03 | 2012-03-21 | 大连方盛塑料有限公司 | Food packing plastic substrate film and production process thereof |
| CN102501512A (en) * | 2011-11-23 | 2012-06-20 | 安徽嘉阳包装材料有限公司 | Seven-layer co-extrusion high-barrier film |
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| Publication number | Publication date |
|---|---|
| CN103009753A (en) | 2013-04-03 |
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