CN107685518A - 一种包装用cpp薄膜及其制备方法 - Google Patents

一种包装用cpp薄膜及其制备方法 Download PDF

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CN107685518A
CN107685518A CN201710977670.2A CN201710977670A CN107685518A CN 107685518 A CN107685518 A CN 107685518A CN 201710977670 A CN201710977670 A CN 201710977670A CN 107685518 A CN107685518 A CN 107685518A
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cpp films
packed
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extruder
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焦国平
齐继业
方兴旺
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Anhui Songtai Packing Material Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/32Layered products comprising a layer of synthetic resin comprising polyolefins
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29DPRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D7/00Producing flat articles, e.g. films or sheets
    • B29D7/01Films or sheets
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/06Layered 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
    • B32B27/08Layered 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/18Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/30Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/308Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00Ancillary operations in connection with laminating processes
    • B32B38/0008Electrical discharge treatment, e.g. corona, plasma treatment; wave energy or particle radiation
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38Packaging materials of special type or form
    • B65D65/40Applications of laminates for particular packaging purposes
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00Use of organic ingredients
    • C08K5/16Nitrogen-containing compounds
    • C08K5/20Carboxylic acid amides
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    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/10Homopolymers or copolymers of propene
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    • B32B2307/40Properties of the layers or laminate having particular optical properties
    • B32B2307/412Transparent
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00Properties of the layers or laminate
    • B32B2307/70Other properties
    • B32B2307/724Permeability to gases, adsorption
    • B32B2307/7242Non-permeable
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00Containers; Receptacles
    • B32B2439/70Food packaging
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
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Abstract

一种包装用CPP薄膜,包括表层、中间层、底层;所述表层由质量分数为:97wt%~98.5wt%的无规共聚聚丙烯和1.5wt%~3wt%的滑爽剂组成;所述中间层由质量分数为65wt%~75wt%丙烯基弹性体与25wt%~35wt%茂金属聚乙烯组成;所述底层由质量分数为96wt%~97.5wt%的二元共聚聚丙烯和2.5wt%~4wt%的滑爽剂组成,将原料混合搅拌均匀后按要求分别加入三台挤出机挤出流延,经冷却定型、电晕处理、裁剪收卷得CPP薄膜。本发明的有益效果为:(1)该CPP薄膜的手感较软,表层容易被印刷;(2)该CPP薄膜具有高气密性、高透明性、起封温度低、热封强度好,能广泛应用于各食品的外包装;(3)该CPP薄膜的生产工艺简单,成本低。

Description

一种包装用CPP薄膜及其制备方法
技术领域
本发明涉及CPP薄膜领域,具体涉及一种包装用CPP薄膜及其制备方法。
背景技术
CPP薄膜即流延聚丙烯薄膜cast polypropylene,也称未拉伸聚丙烯薄膜,按用途不同可分为通用CPP(General CPP,简称GCPP)薄膜、镀铝级CPP(Metalize CPP,简称MCPP)薄膜和蒸煮级CPP(Retort CPP,简称RCPP)薄膜等。
CPP是塑胶工业中通过流延挤塑工艺生产的聚丙烯(PP)薄膜。该类薄膜与BOPP(双向聚丙烯)薄膜不同,属非取向薄膜。严格地说,CPP薄膜仅在纵向(MD)方向存在某种取向,主要是由于工艺性质所致。通过在冷铸辊上快速冷却,在薄膜上形成优异的清晰度和光洁度。
现有大部分CPP薄膜手感太硬,而且印刷难度升高,难以在产品的包装外观上印刷商标、产品特征等。
发明内容
本发明的目的是为了克服现有技术中的不足,提供一种包装用CPP薄膜及其制备方法。
为解决上述技术问题,本发明的技术方案为:
一种包装用CPP薄膜,包括表层、中间层、底层;所述表层由质量分数为:97wt%~98.5wt%的无规共聚聚丙烯和1.5wt%~3wt%的滑爽剂组成;所述中间层由质量分数为65wt%~75wt%丙烯基弹性体与25wt%~35wt%茂金属聚乙烯组成;所述底层由质量分数为96wt%~97.5wt%的二元共聚聚丙烯和2.5wt%~4wt%的滑爽剂组成。
优选地,所述二元共聚聚丙烯为丙烯与乙烯的共聚物。
优选地,所述滑爽剂为芥酸酰胺。
一种制备上述包装用CPP薄膜的方法,其包括以下步骤:将原料混合搅拌均匀后按要求加入A、B、C三台挤出机挤出流延,经冷却定型,电晕处理;裁剪收卷,最后制成成品CPP薄膜。
优选地,表层、中间层和底层三层之间质量百分比为10~30%∶40%~80%∶10%~30%;挤出机的挤出量是500~900公斤/小时,挤出机的加工温度是230~260℃,挤出机机械速度是10~150m/min;挤出机模头是T型模头,T型模头的温度是230~250℃,CPP薄膜的厚度为0.1~2.5mm,宽度为500mm~3000mm;冷却辊冷却温度10~20℃;电晕处理的处理功率13~15KW。
本发明的有益效果为:(1)该CPP薄膜的手感较软,同时表层可以很容易印刷图案或者字迹,利于后期的包装销售;(2)该CPP薄膜具有高气密性、高透明性、起封温度低、热封强度好,能广泛应用于各食品的外包装;(3)该CPP薄膜的生产工艺简单,成本低,可以广泛推荐使用。
具体实施方式
为使对本发明的结构特征及所达成的功效有更进一步的了解与认识,用以较佳的实施例配合详细的说明,说明如下:
实施例1
一种包装用CPP薄膜,包括表层、中间层、底层;所述表层由质量分数为:97wt%的无规共聚聚丙烯和3wt%的芥酸酰胺组成;所述中间层由质量分数为65wt%丙烯基弹性体与35wt%茂金属聚乙烯组成;所述底层由质量分数为96wt%的二元共聚聚丙烯和4wt%的芥酸酰胺组成。
其中,所述二元共聚聚丙烯为丙烯与乙烯的共聚物。
一种制备上述包装用CPP薄膜的方法,其包括以下步骤:将原料混合搅拌均匀后按要求加入A、B、C三台挤出机挤出流延,经冷却定型,电晕处理;裁剪收卷,最后制成成品CPP薄膜。
其中,所述表层、中间层和底层三层之间质量百分比为10%∶80%∶10%;挤出机的挤出量是500公斤/小时,挤出机的加工温度是230℃,挤出机机械速度是10m/min;挤出机模头是T型模头,T型模头的温度是230℃,CPP薄膜的厚度为0.1mm,宽度为500mm;冷却辊冷却温度10℃;电晕处理的处理功率13KW。
实施例2
一种包装用CPP薄膜,包括表层、中间层、底层;所述表层由质量分数为:98.5wt%的无规共聚聚丙烯和1.5wt%的芥酸酰胺组成;所述中间层由质量分数为75wt%丙烯基弹性体与25wt%茂金属聚乙烯组成;所述底层由质量分数为97.5wt%的二元共聚聚丙烯和2.5wt%的芥酸酰胺组成。
其中,所述二元共聚聚丙烯为丙烯与乙烯的共聚物。
一种制备上述包装用CPP薄膜的方法,其包括以下步骤:将原料混合搅拌均匀后按要求加入A、B、C三台挤出机挤出流延,经冷却定型,电晕处理;裁剪收卷,最后制成成品CPP薄膜。
其中,所述表层、中间层和底层三层之间质量百分比为30%∶40%∶30%;挤出机的挤出量是900公斤/小时,挤出机的加工温度是260℃,挤出机机械速度是150m/min;挤出机模头是T型模头,T型模头的温度是250℃,CPP薄膜的厚度为2.5mm,宽度为3000mm;冷却辊冷却温度20℃;电晕处理的处理功率15KW。
实施例3
一种包装用CPP薄膜,包括表层、中间层、底层;所述表层由质量分数为:98wt%的无规共聚聚丙烯和2wt%的芥酸酰胺组成;所述中间层由质量分数为70wt%丙烯基弹性体与30wt%茂金属聚乙烯组成;所述底层由质量分数为97wt%的二元共聚聚丙烯和3wt%的芥酸酰胺组成。
其中,所述二元共聚聚丙烯为丙烯与乙烯的共聚物。
一种制备上述包装用CPP薄膜的方法,其包括以下步骤:将原料混合搅拌均匀后按要求加入A、B、C三台挤出机挤出流延,经冷却定型,电晕处理;裁剪收卷,最后制成成品CPP薄膜。
其中,所述表层、中间层和底层三层之间质量百分比为20%∶60%∶20%;挤出机的挤出量是700公斤/小时,挤出机的加工温度是245℃,挤出机机械速度是80m/min;挤出机模头是T型模头,T型模头的温度是245℃,CPP薄膜的厚度为1.5mm,宽度为2000mm;冷却辊冷却温度15℃;电晕处理的处理功率14KW。
本发明的有益效果为:(1)该CPP薄膜的手感较软,同时表层可以很容易印刷图案或者字迹,利于后期的包装销售;(2)该CPP薄膜具有高气密性、高透明性、起封温度低、热封强度好,能广泛应用于各食品的外包装;(3)该CPP薄膜的生产工艺简单,成本低,可以广泛推荐使用。
以上显示和描述了本发明的基本原理、主要特征和本发明的优点。本行业的技术人员应该了解,本发明不受上述实施例的限制,上述实施例和说明书中描述的只是本发明的原理,在不脱离本发明精神和范围的前提下本发明还会有各种变化和改进,这些变化和改进都落入要求保护的本发明的范围内。本发明要求的保护范围由所附的权利要求书及其等同物界定。

Claims (5)

1.一种包装用CPP薄膜,包括表层、中间层、底层;其特征在于:所述表层由质量分数为:97wt%~98.5wt%的无规共聚聚丙烯和1.5wt%~3wt%的滑爽剂组成;所述中间层由质量分数为65wt%~75wt%丙烯基弹性体与25wt%~35wt%茂金属聚乙烯组成;所述底层由质量分数为96wt%~97.5wt%的二元共聚聚丙烯和2.5wt%~4wt%的滑爽剂组成。
2.根据权利要求1所述的一种包装用CPP薄膜,其特征在于:所述二元共聚聚丙烯为丙烯与乙烯的共聚物。
3.根据权利要求1所述的一种包装用CPP薄膜,其特征在于:所述滑爽剂为芥酸酰胺。
4.一种制备权利要求1所述包装用CPP薄膜的方法,其特征在于:
包括以下步骤:将原料混合搅拌均匀后按要求加入A、B、C三台挤出机挤出流延,经冷却定型,电晕处理;裁剪收卷,最后制成成品CPP薄膜。
5.根据权利要求4所述的一种制备包装用CPP薄膜的方法,其特征在于:所述表层、中间层和底层三层之间质量百分比为10~30%∶40%~80%∶10%~30%;挤出机的挤出量是500~900公斤/小时,挤出机的加工温度是230~260℃,挤出机机械速度是10~150m/min;挤出机模头是T型模头,T型模头的温度是230~250℃,CPP薄膜的厚度为0.1~2.5mm,宽度为500mm~3000mm;冷却辊冷却温度10~20℃;电晕处理的处理功率13~15KW。
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CN108641196A (zh) * 2018-05-15 2018-10-12 河北泰达包装材料有限公司 一种软包装改性cpp薄膜及其生产方法

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