CN104275900B - 一种充气食品用三层共挤复合薄膜 - Google Patents
一种充气食品用三层共挤复合薄膜 Download PDFInfo
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- CN104275900B CN104275900B CN201410431967.5A CN201410431967A CN104275900B CN 104275900 B CN104275900 B CN 104275900B CN 201410431967 A CN201410431967 A CN 201410431967A CN 104275900 B CN104275900 B CN 104275900B
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- 235000013305 food Nutrition 0.000 title claims abstract description 25
- 229920001684 low density polyethylene Polymers 0.000 claims abstract description 22
- 239000004702 low-density polyethylene Substances 0.000 claims abstract description 22
- -1 polyethylene Polymers 0.000 claims abstract description 16
- 238000007789 sealing Methods 0.000 claims abstract description 14
- 239000004743 Polypropylene Substances 0.000 claims abstract description 10
- 229920001155 polypropylene Polymers 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 9
- 238000005266 casting Methods 0.000 claims abstract description 5
- 239000000155 melt Substances 0.000 claims abstract description 4
- 239000000758 substrate Substances 0.000 claims abstract description 4
- 238000005253 cladding Methods 0.000 claims abstract description 3
- 238000005491 wire drawing Methods 0.000 claims description 9
- 239000004698 Polyethylene Substances 0.000 abstract description 8
- 229920000573 polyethylene Polymers 0.000 abstract description 8
- 230000004888 barrier function Effects 0.000 abstract description 6
- 239000003205 fragrance Substances 0.000 abstract description 5
- 238000004806 packaging method and process Methods 0.000 description 7
- 239000005025 cast polypropylene Substances 0.000 description 5
- 230000008901 benefit Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229920006280 packaging film Polymers 0.000 description 2
- 239000012785 packaging film Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- 235000008429 bread Nutrition 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 235000013410 fast food Nutrition 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- 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
- B32B27/327—Layered products comprising a layer of synthetic resin comprising polyolefins comprising polyolefins obtained by a metallocene or single-site catalyst
-
- 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
- B32B2250/00—Layers arrangement
- B32B2250/03—3 layers
-
- 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
- B32B2250/00—Layers arrangement
- B32B2250/24—All layers being polymeric
- B32B2250/242—All polymers belonging to those covered by group B32B27/32
-
- 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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
-
- 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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/54—Yield strength; Tensile strength
-
- 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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/724—Permeability to gases, adsorption
- B32B2307/7242—Non-permeable
-
- 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
- B32B2439/00—Containers; Receptacles
- B32B2439/70—Food packaging
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Laminated Bodies (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
本发明公开了一种充气食品用三层共挤复合薄膜，由流延机三层共挤而成，具有复合在一起的外层、中层和内层，其中内层采用三元无规聚乙烯为基底和茂金属低密度聚乙烯按照6:1的比例混合，所述三元无规聚乙烯和茂金属低密度聚乙烯的熔融指数为8；所述中层和外层材料均采用高抗冲聚丙烯，聚丙烯的熔融指数为9；挤出速度内：中：外速度是：400:300：300，热封温度为118—120摄氏度。本发明增加内层的原料流量，有效降低膜的热封温度和强度、拉力；内层加茂金属SP1520，增加膜热封强度，堵膜的缩小孔，提高膜的阻隔性和密闭性，从而提高膜的各项指标，防漏气，使食品的保香性更好，提高食品的保质时间。
Description
技术领域
本发明涉及一种三层共挤复合薄膜，尤其涉及一种充气食品用三层共挤复合薄膜。
背景技术
目前，三层共挤复合薄膜已经广泛地应用于食品、医药、化工等领域，其中又以食品包装所占比例最大，比如饮料包装、速冻食品包装、蒸煮食品包装、快餐食品包装等，这些产品都给人们生活带来了极大的便利。
但是对于食品，特别是面包等食品，漏气等原因导致的其货架期和质保时间短，严重影响了客户在使用包装膜上所带来的经济效益，现有的三层共挤复合薄膜使用较多的是流延聚丙烯薄膜 (CPP)，采用聚丙烯(PP)原料经流延机三层共挤而成，这种PP原料决定了流延聚丙烯薄膜(CPP)韧性不够，膜比较硬，热封温度高，所以容易漏气，保温性差，保质时间短。
发明内容
本发明的目的在于解决当前技术中存在的问题，提供一种柔韧性强、热封温度低、密闭性好的充气食品用三层共挤复合薄膜。通过本薄膜能使食品的保香性更好，提高食品的保质时间。
为达到上述目的，本发明所采用的技术手段是：一种充气食品用三层共挤复合薄膜，由流延机三层共挤而成，具有复合在一起的外层、中层和内层，其中内层采用三元无规聚乙烯为基底和茂金属低密度聚乙烯按照6:1的比例混合，所述三元无规聚乙烯和茂金属低密度聚乙烯的熔融指数为 8；所述中层和外层材料均采用高抗冲拉丝聚丙烯，高抗冲拉丝聚丙烯的熔融指数为 9；挤出速度内：中：外速度是：400:300：300，热封温度为118—120摄氏度。
进一步的，所述三元无规聚乙烯采用TF400，茂金属低密度聚乙烯采用SP1520。
进一步的，所述高抗冲拉丝聚丙烯采用纯L5E89。
本发明的有益效果在于：增加内层的原料流量，有效降低膜的热封温度和强度、拉力；内层加茂金属SP1520，增加膜热封强度，堵膜的缩小孔，提高膜的阻隔性和密闭性，从而提高膜的各项指标，防漏气，使食品的保香性更好，提高食品的保质时间。
具体实施方式
一种充气食品用三层共挤复合薄膜，由流延机三层共挤而成，具有复合在一起的外层、中层和内层，其中内层采用三元无规聚乙烯为基底和茂金属低密度聚乙烯按照6:1的比例混合，所述三元无规聚乙烯和茂金属低密度聚乙烯的熔融指数为 8；所述中层和外层材料均采用高抗冲拉丝聚丙烯，高抗冲拉丝聚丙烯的熔融指数为 9；挤出速度内：中：外速度是：400:300：300，热封温度为118—120摄氏度。
进一步的，所述三元无规聚乙烯采用TF400，茂金属低密度聚乙烯采用SP1520。
进一步的，所述高抗冲拉丝聚丙烯采用纯L5E89。
内层：三元无规热封料（TF400）与茂金属（SP1520）6:1的比例混合，一是：TF400热封度低，二是：配上六分之一的茂金属SP1520，增加膜的热封强度，膜的韧性，最重要一点能增加膜的微小孔，防止漏气，提高膜的阻隔性，提高食品的保质期，保香性，中外层用拉丝聚丙烯，从而保证了抗冲击能力，内、中、外三层流量比例为40%、30%、30%，这样流量比例，中外层保持高冲击能力，保持拉丝聚丙烯的透明度、光泽度，内层占40%，提高膜的热封强度，膜的阻隔性、密闭性。内层比例提高至40%。从而改善了膜的手感从而更柔软，富有拉力。热封温度维持在118—120摄氏度之间，属于超低温热封，温度越高，膜的结晶度越高，从而膜更硬、更脆，容易破包。而118-120摄氏度的超低温热封使膜在热封时产生结晶很低。之所以不容易破包，富有很强的拉力、韧性。再者添加六分之一的SP1520，效果更为明显，包装膜不容易破，阻隔性高，密闭性好，是充气包装的必备性能。
中、外层保持用CPP材料，保证膜的高抗冲性，保留膜的部分优点：刚性、拉力、透明度。内、中、外层流量比例，内层提高，中外层降低，抗冲击强、透明度好、热封好。
控制各层的挤出速度，比如同比速挤出电机情况下，要控制内、中、外比例，比例为：40%：30%：30%。就可开机速为内：中：外速度是：400:300：300，提高机速时，同比例往上倍增。
采用上述方案后，增加内层的原料流量，有效降低膜的热封温度和强度、拉力；内层加茂金属SP1520，增加膜热封强度，堵膜的缩小孔，提高膜的阻隔性和密闭性，从而提高膜的各项指标，防漏气。为充气包装的食品提供了一种柔韧性强、热封温度低、密闭性好的三层共挤复合薄膜，通过本薄膜能使食品的保香性更好，提高食品的保质时间。
申请实施例只是用于说明本申请所公开的技术特征，本领域技术人员通过简单的替换所进行的改变，仍然属于本申请所保护的范围。
Claims (2)
1.一种充气食品用三层共挤复合薄膜，由流延机三层共挤而成，具有复合在一起的外层、中层和内层，其特征在于：其中内层采用TF400为基底和茂金属低密度聚乙烯按照 6:1的比例混合，所述TF400和茂金属低密度聚乙烯的熔融指数为8；所述中层和外层材料均采用高抗冲拉丝聚丙烯，高抗冲拉丝聚丙烯的熔融指数为9；挤出速度内：中：外速度是：400：300：300，热封温度为118—120摄氏度；茂金属低密度聚乙烯采用 SP1520。
2.根据权利要求 1 所述的充气食品用三层共挤复合薄膜，其特征在于：所述高抗冲拉丝聚丙烯采用纯 L5E89。
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