CN112009058A - 一种粉剂包装用pe薄膜及其制备方法 - Google Patents
一种粉剂包装用pe薄膜及其制备方法 Download PDFInfo
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- 239000000843 powder Substances 0.000 title claims abstract description 28
- 238000004806 packaging method and process Methods 0.000 title claims abstract description 25
- 238000002360 preparation method Methods 0.000 title claims description 17
- 229920001684 low density polyethylene Polymers 0.000 claims abstract description 52
- 239000004702 low-density polyethylene Substances 0.000 claims abstract description 52
- 239000004712 Metallocene polyethylene (PE-MC) Substances 0.000 claims abstract description 51
- 239000004698 Polyethylene Substances 0.000 claims abstract description 50
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000011737 fluorine Substances 0.000 claims abstract description 33
- 229910052731 fluorine Inorganic materials 0.000 claims abstract description 33
- 229920000092 linear low density polyethylene Polymers 0.000 claims abstract description 33
- 239000004707 linear low-density polyethylene Substances 0.000 claims abstract description 33
- 229920000642 polymer Polymers 0.000 claims abstract description 33
- 239000003242 anti bacterial agent Substances 0.000 claims abstract description 27
- 239000002216 antistatic agent Substances 0.000 claims abstract description 20
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 20
- 229920001903 high density polyethylene Polymers 0.000 claims abstract description 20
- 239000004700 high-density polyethylene Substances 0.000 claims abstract description 20
- 239000004594 Masterbatch (MB) Substances 0.000 claims description 54
- 239000002994 raw material Substances 0.000 claims description 33
- 238000001125 extrusion Methods 0.000 claims description 22
- UAUDZVJPLUQNMU-UHFFFAOYSA-N Erucasaeureamid Natural products CCCCCCCCC=CCCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-UHFFFAOYSA-N 0.000 claims description 15
- UAUDZVJPLUQNMU-KTKRTIGZSA-N erucamide Chemical compound CCCCCCCC\C=C/CCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-KTKRTIGZSA-N 0.000 claims description 15
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 14
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 12
- 238000000071 blow moulding Methods 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 12
- 229910052710 silicon Inorganic materials 0.000 claims description 12
- 239000010703 silicon Substances 0.000 claims description 12
- LDVVTQMJQSCDMK-UHFFFAOYSA-N 1,3-dihydroxypropan-2-yl formate Chemical group OCC(CO)OC=O LDVVTQMJQSCDMK-UHFFFAOYSA-N 0.000 claims description 7
- 239000000377 silicon dioxide Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 4
- 238000005096 rolling process Methods 0.000 claims description 4
- 238000007493 shaping process Methods 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims 1
- 230000008018 melting Effects 0.000 claims 1
- 238000003466 welding Methods 0.000 abstract description 14
- 239000000463 material Substances 0.000 abstract description 7
- 239000002131 composite material Substances 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000005611 electricity Effects 0.000 abstract description 3
- 230000003068 static effect Effects 0.000 abstract description 3
- 241001391944 Commicarpus scandens Species 0.000 abstract description 2
- 230000000844 anti-bacterial effect Effects 0.000 abstract 1
- 235000012239 silicon dioxide Nutrition 0.000 description 6
- 229920003023 plastic Polymers 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 230000003115 biocidal effect Effects 0.000 description 2
- 229920001179 medium density polyethylene Polymers 0.000 description 2
- 239000004701 medium-density polyethylene Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000012785 packaging film Substances 0.000 description 2
- 229920006280 packaging film Polymers 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- -1 Polyethylene Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229920003020 cross-linked polyethylene Polymers 0.000 description 1
- 239000004703 cross-linked polyethylene Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000005021 flexible packaging material Substances 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
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Abstract
本发明公开一种粉剂包装用PE薄膜,属于PE薄膜技术领域,PE薄膜由内层、中层、外层熔融共挤制成,且进一步公开了内层、中层、外层的原料组成,同时提供PE薄膜的制备方法。本发明的PE薄膜,焊封强度大、不易破袋和漏料、易开口、易焊封、抗菌,尤其适用于多种粉剂料的包装,降低了生产成本;中层中低密度聚乙烯、线性低密度聚乙烯、茂金属聚乙烯、含氟聚合物组合,能够改善薄膜的挺度,使薄膜外观更平展,也能改善薄膜的强度;内层作为焊封层,加入茂金属聚乙烯提高了薄膜的强度和焊封性能,高密度聚乙烯也提高了薄膜的强度,加入抗菌剂提高了薄膜的保鲜性,加入抗结剂提高使用时的开口性能,加入抗静电剂减少薄膜因静电吸附内装物。
Description
技术领域
本发明属于PE薄膜技术领域。
背景技术
聚乙烯薄膜,即PE薄膜,是指用PE生产的薄膜,可以分为低密度聚乙烯(LDPE)、中密度聚乙烯(MDPE)、高密度聚乙烯(HDPE)以及交联聚乙烯;低密度聚乙烯薄膜是一种半透明、高光泽、热封性能好的薄膜,具有优良的化学稳定性、热封性、耐水性和防潮性,耐冷冻,可水煮,常用于复合软包装材料的薄膜,也是目前应用最广泛、用量最大的一种塑料包装薄膜,约占塑料包装薄膜耗用量的40%以上。低密度聚乙烯虽然具有良好的韧性,但其强度低,粉剂一般在包装时,如面粉、滑石粉、药品等粉剂具有飞扬性,易滞留在焊封部位,影响焊封效果,普通的PE薄膜由于焊封强度低,易破袋、漏料等。
发明内容
本发明目的在于提供一种粉剂包装用PE薄膜,同时提供其相应的制备方法是本发明的另一发明目的。
基于上述目的,本发明采取以下技术方案:
一种粉剂包装用PE薄膜, PE薄膜由内层、中层、外层熔融共挤制成,所述内层由以下重量份的原料组成:茂金属聚乙烯35-45份、低密度聚乙烯31-39份、高密度聚乙烯17-23份、抗结剂母粒0.8-1.2份、抗静电剂母粒2.5-3.5份、芥酸酰胺0.8-1.2份、抗菌剂0.8-1.2份;
所述中层由以下重量份的原料组成:低密度聚乙烯22-28份、线性低密度聚乙烯22-28份、茂金属聚乙烯44-55份、含氟聚合物0.3-0.7份;
所述外层由以下重量份的原料组成:低密度聚乙烯30-36份、线性低密度聚乙烯30-36份、茂金属聚乙烯27-35份、含氟聚合物0.3-0.7份、有机硅母粒0.6-1.0份。
一种粉剂包装用PE薄膜,其由内层、中层、外层熔融共挤制成,所述内层由以下重量份的原料组成:茂金属聚乙烯38-42份、低密度聚乙烯34-37份、高密度聚乙烯17-21份、抗结剂母粒0.9-1.2份、抗静电剂母粒2.8-3.3份、芥酸酰胺0.8-1.0份、抗菌剂0.8-1.0份;
所述中层由以下重量份的原料组成:低密度聚乙烯23-27份、线性低密度聚乙烯23-27份、茂金属聚乙烯47-52份、含氟聚合物0.4-0.6份;
所述外层由以下重量份的原料组成:低密度聚乙烯32-35份、线性低密度聚乙烯31-35份、茂金属聚乙烯29-32份、含氟聚合物0.4-0.6份、有机硅母粒0.7-1.0份。
一种粉剂包装用PE薄膜,其由内层、中层、外层熔融共挤制成,所述内层由以下重量份的原料组成:茂金属聚乙烯40份、低密度聚乙烯35份、高密度聚乙烯20份、抗结剂母粒1.0份、抗静电剂母粒3.0份、芥酸酰胺1.0份、抗菌剂1.0份;
所述中层由以下重量份的原料组成:低密度聚乙烯25份、线性低密度聚乙烯25份、茂金属聚乙烯49.5份、含氟聚合物0.5份;
所述外层由以下重量份的原料组成:低密度聚乙烯33份、线性低密度聚乙烯33份、茂金属聚乙烯31.7份、含氟聚合物0.5份、有机硅母粒0.8份。
所述PE薄膜的厚度为80-100μm;内层、中层、外层的厚度之比为(2.5-3.5)︰(3.5-4.5)︰(2.5-3.5)。
所述抗结剂母粒为二氧化硅母粒,抗静电剂为单甘脂,抗菌剂为PE抗菌剂。
制备粉剂包装用PE薄膜的方法,包括以下步骤:
1)于150-180℃下,
内层的制备:将茂金属聚乙烯、低密度聚乙烯、高密度聚乙烯、抗结剂母粒、抗静电剂母粒、芥酸酰胺、抗菌剂混合,熔融挤出、吹塑成型;
中层的制备:将低密度聚乙烯、线性低密度聚乙烯、茂金属聚乙烯、含氟聚合物混合,熔融挤出、吹塑成型;
外层的制备:将低密度聚乙烯、线性低密度聚乙烯、茂金属聚乙烯、含氟聚合物、有机硅母粒混合,熔融挤出、吹塑成型;
2)于180-190℃下,将步骤1)的内层、中层、外层同时共挤挤出、冷却定型,收卷为卷制品即可。
与现有技术相比,本发明具有以下有益效果:
1)本发明制成的PE薄膜,具有焊封强度大、不易破袋和漏料、易开口、易焊封、抗菌的优点,尤其适用于多种粉剂料的包装,降低了生产成本;
2)中层中低密度聚乙烯、线性低密度聚乙烯、茂金属聚乙烯、含氟聚合物组合,能够改善薄膜的挺度,使薄膜外观更平展,同时也能改善薄膜的强度;内层作为焊封层,加入茂金属聚乙烯提高了薄膜的强度和焊封性能,高密度聚乙烯也提高了薄膜的强度,加入抗菌剂提高了薄膜的保鲜性,加入抗结剂提高使用时的开口性能,加入抗静电剂减少薄膜因静电吸附内装物;
3)本发明制备方法简单、易操作,便于推广应用。
具体实施方式
实施例1
一种粉剂包装用PE薄膜,其由内层、中层、外层熔融共挤制成,所述内层由以下重量份的原料组成:茂金属聚乙烯40份、低密度聚乙烯35份、高密度聚乙烯20份、抗结剂母粒(二氧化硅母粒)1.0份、抗静电剂母粒(单甘脂)3.0份、芥酸酰胺1.0份、抗菌剂(科普茵销售的PE抗菌剂KP-J151)1.0份;
所述中层由以下重量份的原料组成:低密度聚乙烯25份、线性低密度聚乙烯25份、茂金属聚乙烯49.5份、含氟聚合物(PPA)0.5份;
所述外层由以下重量份的原料组成:低密度聚乙烯33份、线性低密度聚乙烯33份、茂金属聚乙烯31.7份、含氟聚合物(PPA)0.5份、有机硅母粒0.8份。
所述PE薄膜的厚度为100μm;内层、中层、外层的厚度之比为3.0︰4.0︰3.0。
制备粉剂包装用PE薄膜的方法,包括以下步骤:
1)于180℃下,
内层的制备:将茂金属聚乙烯、低密度聚乙烯、高密度聚乙烯、抗结剂母粒、抗静电剂母粒、芥酸酰胺、抗菌剂混合,熔融挤出、吹塑成型;
中层的制备:将低密度聚乙烯、线性低密度聚乙烯、茂金属聚乙烯、含氟聚合物混合,熔融挤出、吹塑成型;
外层的制备:将低密度聚乙烯、线性低密度聚乙烯、茂金属聚乙烯、含氟聚合物、有机硅母粒混合,熔融挤出、吹塑成型;
2)于190℃下,将步骤1)的内层、中层、外层同时共挤挤出、冷却定型,收卷为卷制品即可。
实施例2
一种粉剂包装用PE薄膜,其由内层、中层、外层熔融共挤制成,所述内层由以下重量份的原料组成:茂金属聚乙烯39份、低密度聚乙烯37份、高密度聚乙烯18份、抗结剂母粒(二氧化硅母粒)1.2份、抗静电剂母粒(单甘脂)3.1份、芥酸酰胺0.9份、抗菌剂(科普茵销售的PE抗菌剂KP-J151)0.8份;
所述中层由以下重量份的原料组成:低密度聚乙烯24份、线性低密度聚乙烯24份、茂金属聚乙烯50.4份、含氟聚合物(PPA)0.6份;
所述外层由以下重量份的原料组成:低密度聚乙烯35份、线性低密度聚乙烯32份、茂金属聚乙烯31.9份、含氟聚合物(PPA)0.4份、有机硅母粒0.7份。
所述PE薄膜的厚度为90μm;内层、中层、外层的厚度之比为3.0︰4.0︰3.0。
制备粉剂包装用PE薄膜的方法,包括以下步骤:
1)于160℃下,
内层的制备:将茂金属聚乙烯、低密度聚乙烯、高密度聚乙烯、抗结剂母粒、抗静电剂母粒、芥酸酰胺、抗菌剂混合,熔融挤出、吹塑成型;
中层的制备:将低密度聚乙烯、线性低密度聚乙烯、茂金属聚乙烯、含氟聚合物混合,熔融挤出、吹塑成型;
外层的制备:将低密度聚乙烯、线性低密度聚乙烯、茂金属聚乙烯、含氟聚合物、有机硅母粒混合,熔融挤出、吹塑成型;
2)于180℃下,将步骤1)的内层、中层、外层同时共挤挤出、冷却定型,收卷为卷制品即可。
实施例3
一种粉剂包装用PE薄膜,其由内层、中层、外层熔融共挤制成,所述内层由以下重量份的原料组成:茂金属聚乙烯40份、低密度聚乙烯34份、高密度聚乙烯21份、抗结剂母粒(二氧化硅母粒)1.1份、抗静电剂母粒(单甘脂)2.8份、芥酸酰胺0.8份、抗菌剂(科普茵销售的PE抗菌剂KP-J151)1.0份;
所述中层由以下重量份的原料组成:低密度聚乙烯26份、线性低密度聚乙烯27份、茂金属聚乙烯46.6份、含氟聚合物(PPA)0.4份;
所述外层由以下重量份的原料组成:低密度聚乙烯33份、线性低密度聚乙烯35份、茂金属聚乙烯30.4份、含氟聚合物(PPA)0.6份、有机硅母粒1.0份。
所述PE薄膜的厚度为80μm;内层、中层、外层的厚度之比为3.0︰4.0︰3.0。
实施例3的制备粉剂包装用PE薄膜的方法参照实施例1。
实施例4
一种粉剂包装用PE薄膜,其由内层、中层、外层熔融共挤制成,所述内层由以下重量份的原料组成:茂金属聚乙烯35份、低密度聚乙烯37份、高密度聚乙烯23份、抗结剂母粒(二氧化硅母粒)0.9份、抗静电剂母粒(单甘脂)2.5份、芥酸酰胺0.8份、抗菌剂(科普茵销售的PE抗菌剂KP-J151)0.8份;
所述中层由以下重量份的原料组成:低密度聚乙烯28份、线性低密度聚乙烯25份、茂金属聚乙烯46.3份、含氟聚合物(PPA)0.7份;
所述外层由以下重量份的原料组成:低密度聚乙烯30份、线性低密度聚乙烯36份、茂金属聚乙烯35份、含氟聚合物(PPA)0.7份、有机硅母粒1.0份。
所述PE薄膜的厚度为85μm;内层、中层、外层的厚度之比为2.5︰4.5︰3.0。
实施例4的制备粉剂包装用PE薄膜的方法参照实施例1。
实施例5
一种粉剂包装用PE薄膜,其由内层、中层、外层熔融共挤制成,所述内层由以下重量份的原料组成:茂金属聚乙烯45份、低密度聚乙烯31份、高密度聚乙烯18份、抗结剂母粒(二氧化硅母粒)1.2份、抗静电剂母粒(单甘脂)2.8份、芥酸酰胺0.8份、抗菌剂(科普茵销售的PE抗菌剂KP-J151)1.2份;
所述中层由以下重量份的原料组成:低密度聚乙烯22份、线性低密度聚乙烯27份、茂金属聚乙烯50.7份、含氟聚合物(PPA)0.3份;
所述外层由以下重量份的原料组成:低密度聚乙烯36份、线性低密度聚乙烯33份、茂金属聚乙烯30份、含氟聚合物(PPA)0.4份、有机硅母粒0.6份。
所述PE薄膜的厚度为95μm;内层、中层、外层的厚度之比为3.5︰4.0︰2.5。
实施例5的制备粉剂包装用PE薄膜的方法参照实施例2。
实施例6 性能测试
对实施例1-5以及市售的PE薄膜的摩擦系数、拉断力、拉伸强度和断裂伸长率等性能进行测试,测试结果如下表1所示。
检测项目采用的标准如下:摩擦系数的测试方法参照GB10006-1988,拉伸强度参照GB/T1040.3-2006《塑料拉伸性能的测试》,拉断力和断裂伸长率参照G B/ T1 30 22-1991《塑料薄膜拉伸性能测试方法》。
由表1可知,本发明制备的PE薄膜的拉断力、拉伸强度、断裂伸长率性能优于思念系列薄膜,说明本发明制备的PE薄膜具备良好的抵抗拉伸的能力和未断裂时的延伸能力。
1)本发明制成的PE薄膜,具有焊封强度大、不易破袋和漏料、易开口、易焊封、抗菌的优点,尤其适用于多种粉剂料的包装,降低了生产成本;
2)中层中低密度聚乙烯、线性低密度聚乙烯、茂金属聚乙烯、含氟聚合物组合,能够改善薄膜的挺度,使薄膜外观更平展,同时也能改善薄膜的强度;内层作为焊封层,加入茂金属聚乙烯提高了薄膜的强度和焊封性能,高密度聚乙烯也提高了薄膜的强度,加入抗菌剂提高了薄膜的保鲜性,加入抗结剂提高使用时的开口性能,加入抗静电剂减少薄膜因静电吸附内装物;
3)本发明制备方法简单、易操作,便于推广应用。
Claims (6)
1.一种粉剂包装用PE薄膜,其特征在于,PE薄膜由内层、中层、外层熔融共挤制成,所述内层由以下重量份的原料组成:茂金属聚乙烯35-45份、低密度聚乙烯31-39份、高密度聚乙烯17-23份、抗结剂母粒0.8-1.2份、抗静电剂母粒2.5-3.5份、芥酸酰胺0.8-1.2份、抗菌剂0.8-1.2份;
所述中层由以下重量份的原料组成:低密度聚乙烯22-28份、线性低密度聚乙烯22-28份、茂金属聚乙烯44-55份、含氟聚合物0.3-0.7份;
所述外层由以下重量份的原料组成:低密度聚乙烯30-36份、线性低密度聚乙烯30-36份、茂金属聚乙烯27-35份、含氟聚合物0.3-0.7份、有机硅母粒0.6-1.0份。
2.如权利要求1所述的粉剂包装用PE薄膜,其特征在于,其由内层、中层、外层熔融共挤制成,所述内层由以下重量份的原料组成:茂金属聚乙烯38-42份、低密度聚乙烯34-37份、高密度聚乙烯17-21份、抗结剂母粒0.9-1.2份、抗静电剂母粒2.8-3.3份、芥酸酰胺0.8-1.0份、抗菌剂0.8-1.0份;
所述中层由以下重量份的原料组成:低密度聚乙烯23-27份、线性低密度聚乙烯23-27份、茂金属聚乙烯47-52份、含氟聚合物0.4-0.6份;
所述外层由以下重量份的原料组成:低密度聚乙烯32-35份、线性低密度聚乙烯31-35份、茂金属聚乙烯29-32份、含氟聚合物0.4-0.6份、有机硅母粒0.7-1.0份。
3.如权利要求2所述的粉剂包装用PE薄膜,其特征在于,其由内层、中层、外层熔融共挤制成,所述内层由以下重量份的原料组成:茂金属聚乙烯40份、低密度聚乙烯35份、高密度聚乙烯20份、抗结剂母粒1.0份、抗静电剂母粒3.0份、芥酸酰胺1.0份、抗菌剂1.0份;
所述中层由以下重量份的原料组成:低密度聚乙烯25份、线性低密度聚乙烯25份、茂金属聚乙烯49.5份、含氟聚合物0.5份;
所述外层由以下重量份的原料组成:低密度聚乙烯33份、线性低密度聚乙烯33份、茂金属聚乙烯31.7份、含氟聚合物0.5份、有机硅母粒0.8份。
4.如权利要求1-3任一所述的粉剂包装用PE薄膜,其特征在于,所述PE薄膜的厚度为80-100μm;内层、中层、外层的厚度之比为(2.5-3.5)︰(3.5-4.5)︰(2.5-3.5)。
5.如权利要求1-3任一所述的粉剂包装用PE薄膜,其特征在于,所述抗结剂母粒为二氧化硅母粒,抗静电剂为单甘脂,抗菌剂为PE抗菌剂。
6.制备权利要求1-3任一所述的粉剂包装用PE薄膜的方法,其特征在于,包括以下步骤:
1)于150-180℃下,
内层的制备:将茂金属聚乙烯、低密度聚乙烯、高密度聚乙烯、抗结剂母粒、抗静电剂母粒、芥酸酰胺、抗菌剂混合,熔融挤出、吹塑成型;
中层的制备:将低密度聚乙烯、线性低密度聚乙烯、茂金属聚乙烯、含氟聚合物混合,熔融挤出、吹塑成型;
外层的制备:将低密度聚乙烯、线性低密度聚乙烯、茂金属聚乙烯、含氟聚合物、有机硅母粒混合,熔融挤出、吹塑成型;
2)于180-190℃下,将步骤1)的内层、中层、外层同时共挤挤出、冷却定型,收卷为卷制品即可。
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CN114193884B (zh) * | 2021-12-30 | 2024-01-30 | 福建恒安卫生材料有限公司 | 一种高强度轻量化的抗菌塑料薄膜及其制备方法 |
CN114407464A (zh) * | 2022-01-13 | 2022-04-29 | 珠海市德燊环保包装有限公司 | 一种高强度、耐撕破的pe膜及其制备方法与应用 |
CN114407464B (zh) * | 2022-01-13 | 2024-02-23 | 珠海市德燊环保包装有限公司 | 一种高强度、耐撕破的pe膜及其制备方法与应用 |
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