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CPP (cast polypropylene) thin film for packaging and preparation method of CPP thin film

A technology for packaging and film, which is applied in the field of CPP film for packaging and its preparation, can solve the problems of hard hand feeling of CPP film, product characteristics of printed trademarks, and increased printing difficulty, and achieve easy printing of patterns or handwriting, good heat-sealing strength, low cost effect

Inactive Publication Date: 2018-02-13
ANHUI SONGTAI PACKAGING MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Most of the existing CPP films feel too hard, and the printing difficulty increases, making it difficult to print trademarks, product features, etc. on the product packaging appearance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A kind of CPP film for packing, comprises surface layer, middle layer, bottom layer; Described surface layer is made up of the random copolymerization polypropylene of 97wt% and the erucamide of 3wt% by mass fraction; Described middle layer is made up of 65wt% by mass fraction The propylene-based elastomer is composed of 35wt% metallocene polyethylene; the bottom layer is composed of 96wt% binary copolymerized polypropylene and 4wt% erucamide.

[0016] Wherein, the binary copolymerized polypropylene is a copolymer of propylene and ethylene.

[0017] A method for preparing the above-mentioned CPP film for packaging, which comprises the following steps: mixing and stirring raw materials evenly, adding three extruders A, B, and C to extrude and cast, cooling and shaping, and corona treatment; roll, and finally made into a finished CPP film.

[0018] Wherein, the mass percentage among the three layers of the surface layer, the middle layer and the bottom layer is 10%: 80%:...

Embodiment 2

[0020] A kind of packaging CPP film, comprises surface layer, middle layer, bottom layer; Described surface layer is made up of the random copolymerization polypropylene of 98.5wt% and erucamide of 1.5wt% by mass fraction; Described middle layer is made up of mass fraction: 75 wt% propylene-based elastomer and 25 wt% metallocene polyethylene; the bottom layer is composed of 97.5 wt% binary copolymerized polypropylene and 2.5 wt% erucamide.

[0021] Wherein, the binary copolymerized polypropylene is a copolymer of propylene and ethylene.

[0022] A method for preparing the above-mentioned CPP film for packaging, which comprises the following steps: mixing and stirring raw materials evenly, adding three extruders A, B, and C to extrude and cast, cooling and shaping, and corona treatment; roll, and finally made into a finished CPP film.

[0023] Wherein, the mass percentage among the three layers of the surface layer, the middle layer and the bottom layer is 30%: 40%: 30%; the e...

Embodiment 3

[0025] A kind of packing CPP film, comprises surface layer, middle layer, bottom layer; Described surface layer is made up of the random copolymerization polypropylene of 98wt% and the erucamide of 2wt% by mass fraction; Described middle layer is made up of mass fraction is 70wt% The propylene-based elastomer is composed of 30wt% metallocene polyethylene; the bottom layer is composed of 97wt% binary copolymerized polypropylene and 3wt% erucamide.

[0026] Wherein, the binary copolymerized polypropylene is a copolymer of propylene and ethylene.

[0027] A method for preparing the above-mentioned CPP film for packaging, which comprises the following steps: mixing and stirring raw materials evenly, adding three extruders A, B, and C to extrude and cast, cooling and shaping, and corona treatment; roll, and finally made into a finished CPP film.

[0028] Wherein, the mass percentage between the three layers of the surface layer, the middle layer and the bottom layer is 20%: 60%: 2...

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Abstract

The invention discloses a CPP (cast polypropylene) thin film. The CPP thin film comprises a surface layer, an intermediate layer and a bottom layer; the surface layer is composed of, by weight, 97wt%-98.5wt% of polypropylene random copolymer and 1.5wt%-3wt% of a slip agent; the intermediate layer is composed of, by weight, 65wt%-75wt% of a propylene based elastomer and 25wt%-35wt% of metallocene polyethylene; the bottom layer is composed of, by weight, 96wt%-97.5wt% of binary copolymer polypropylene and 2.5wt%-4wt% of the slip agent. The preparation method includes that the raw materials are evenly mixed and added in three extruders to have been flow-casting extruded, and the CPP thin film is obtained via cooling formation, corona treatment and cutting and winding. The CPP think film has the advantages that the CPP thin film is soft and hand feeling, and the surface of the thin film is easily printed; the CPP thin film is high in airtightness, high in transparency, low in sealing temperature, good in heat sealing strength and widely applicable to outer package of food; the CPP thin film is simple in production process and low in cost.

Description

technical field [0001] The invention relates to the field of CPP films, in particular to a CPP film for packaging and a preparation method thereof. Background technique [0002] CPP film is cast polypropylene film, also known as unstretched polypropylene film, which can be divided into general CPP (General CPP, GCPP for short) film, metalized CPP (Metalize CPP, MCPP for short) film and Retort CPP (Retort CPP, RCPP for short) film, etc. [0003] CPP is a polypropylene (PP) film produced by a cast extrusion process in the plastics industry. This type of film is different from BOPP (bidirectional polypropylene) film, which is a non-oriented film. Strictly speaking, CPP films only have a certain orientation in the machine direction (MD) direction, mainly due to the nature of the process. Excellent clarity and finish is formed on the film by rapid cooling on chilled rolls. [0004] Most of the existing CPP films feel too hard, and the difficulty of printing increases, making ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/32B32B27/18B32B27/30B32B27/08B32B38/00B65D65/40B29D7/01C08L23/14C08K5/20
CPCB32B27/32B29D7/01B32B27/08B32B27/18B32B27/308B32B38/0008B32B2307/412B32B2307/7242B32B2439/70B65D65/40C08K5/20C08L23/10C08L2203/16C08L23/14C08L23/06
Inventor 焦国平齐继业方兴旺
Owner ANHUI SONGTAI PACKAGING MATERIALS
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