CPP cast film, composite film, preparation method of composite film and tinned sheet

A cast film and cast composite technology, applied in the field of packaging, can solve the problems of difficult printing with special appearance, high loss of printing iron, increase the cost of printing iron, etc., and achieve good corona treatment performance, high temperature resistance, and shear resistance Good performance and high peel strength

Active Publication Date: 2020-08-18
HUANGSHAN NOVEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The printing of tin-plated sheet cans (commonly known as "iron printing") is realized by offset printing using the principle of "oil-water incompatibility". Such as laser effects, matting and bright graphic effects on the same page, etc., if these special printing effects are to be realized, the cost of iron printing will be greatly increased. At the same time, the loss of iron printing is high, and the cost of recycling and processing of iron printing products with large ink volume and coating will also increase.

Method used

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  • CPP cast film, composite film, preparation method of composite film and tinned sheet
  • CPP cast film, composite film, preparation method of composite film and tinned sheet
  • CPP cast film, composite film, preparation method of composite film and tinned sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] S1. Prepare the materials contained in the composite layer, intermediate layer and heat-sealing layer of the CPP cast film as described in Table 2 below, and weigh each component. The specific proportions of the three components in the heat-sealing layer are shown in Table 2. shown;

[0048] S2. Add the components of the composite layer, the middle layer and the heat-sealing layer into the multi-layer co-extrusion casting machine respectively, and obtain CPP streams with different resin ratios in the heat-sealing layer by means of three-layer co-extrusion molding. Extended film 1-6;

[0049] Table 2 Composition of composite layer, middle layer and heat seal layer of CPP cast film

[0050]

[0051] The heat-sealing layer resin ratio in the prepared CPP cast film 1-6 is shown in Table 3 below:

[0052] Table 3 CPP cast film 1-6 heat seal layer resin ratio

[0053] sample 18722—PP(%) OE850—PE(%) ABPP10S (%) CPP cast film 1 80 17 3 CPP cas...

Embodiment 2

[0055] S1. Print ink on the printing film by gravure printing at a printing speed of 220-250m / min, dry and solidify the ink at 65-80°C to form an ink layer;

[0056] Using dry lamination or solvent-free lamination, the glue is evenly coated on the ink layer of the printing film with a rubber roller, and the amount of glue is 4.5-5.5gsm to form an adhesive layer;

[0057] S2. Heat and press the common film 1 prepared in Comparative Example 1 and the printed film through laminating rollers, the compounding temperature is 70-90°C, and the pressure is 0.2-0.4 MPa, wherein the adhesive layer of the common film and the printed film connected to each other, aged for 48-72 hours at a temperature of 45-55°C, and cooled at room temperature for more than 24 hours to prepare a common composite film 1, and to test the printing effect of the common composite film 1;

[0058] The CPP cast film 1-6 prepared in Example 1 is heated and pressed together with the printed film through the laminati...

Embodiment 3

[0061] The ordinary composite film 1 prepared in Example 2 was heat-sealed and pressed with the tin-plated sheet at 120°C, 130°C, 140°C, 150°C, 160°C, 170°C, and 180°C respectively, and the hot-pressed Tin-plated sheet is used for heat-sealing performance test, and the strength value of heat-sealing performance is shown in Table 4 below;

[0062] The CPP cast composite films 1-6 obtained in Example 2 were heat-sealed and pressed with the tin-plated sheet at 120°C, 130°C, 140°C, 150°C, 160°C, 170°C, and 180°C respectively, and the The hot-pressed tin-plated sheet was tested for heat-sealing performance. The strength value of heat-sealing performance is shown in Table 4 below, and the curve of heat-sealing performance changing with temperature is shown in Figure 4 shown;

[0063] Table 4 Heat-sealing performance of composite film and tin-plated sheet at different temperatures (unit: N / 15mm)

[0064]

[0065] Note: The bold part in the table is the strength that meets the s...

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Abstract

The invention provides a CPP cast film, a CPP cast composite film, a preparation method of the CPP cast composite film and a tinned sheet formed by heating and pressing the CPP cast composite film, and belongs to the technical field of packaging. The CPP casting film is prepared from a composite layer, a middle layer and a heat sealing layer through a three-layer co-extrusion casting process, andthe composite film containing the CPP cast film is formed by printing ink on the printing film in an intaglio printing manner, uniformly gluing, and heating and laminating through a laminating rollerto compound the CPP cast film and the printing film together, thereby obtaining the composite film containing the CPP cast film. The composite film can be subjected to heat-seal press fit with a tinned sheet at 130-180 DEG C, and the bonding strength is larger than 5 N/15 mm. The composite film is exquisite in printing, convenient to coat, suitable for can making and reprocessing and capable of bringing a new display effect to iron can packaging through separation and recycling of packaging waste; the compounded products are easy to make cans and form, and packaging waste can bodies are more convenient to recycle and process.

Description

technical field [0001] The invention relates to the technical field of packaging, and specifically relates to a CPP cast film, a CPP cast composite film, a preparation method of a CPP cast composite film, and a tinned sheet hot-pressed with the CPP cast composite film. Background technique [0002] Tin-plated sheet is commonly known as "tinplate". Because of its corrosion resistance, light-proof high barrier, non-toxic, no peculiar smell and other properties, this material can protect the items stored in it well, such as reducing the loss of food nutrition; blocking water vapor , the entry of oxygen to prolong the shelf life of food, etc. From the perspective of environmental protection packaging, tinned sheet is a low-pollution, recyclable and reusable material. Tin plate has good ductility and is easy to form into cans. Therefore, tinned sheet canning packaging containers have been widely used in food packaging, daily chemical packaging, pharmaceutical packaging, industr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/32B32B7/12B32B37/10B32B37/06B32B37/12B41M1/10
CPCB32B27/32B32B7/12B32B37/10B32B37/06B32B37/12B41M1/10Y02W30/80
Inventor 张和平潘健汪学文陈旭张红斌
Owner HUANGSHAN NOVEL
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