PVDC coating thin film and manufacturing method thereof

Abstract

The invention discloses a PVDC coating thin film and a manufacturing method thereof. The method comprises the steps that BOPP, BOPET and BOPA thin films serve as base materials, the production speed can reach 160 m / min, after the base materials are put on a machine, the base materials are subjected to corona treatment, then, primer coating is performed, and coating is performed in a reverse kiss coating mode, wherein the coating weight is 0.4-0.8 g / square; drying is performed rapidly through a drying box, and the temperature of the drying box needs to range from 90 DEG C to 100 DEG C; after passing through a cooling roller, PVDC coating is performed, and coating is performed in the reverse kiss coating mode, wherein the coating weight is 2.5-3.5 g / square; drying is performed through the driving box, wherein the temperature must ranges from 100 DEG C to 120 DEG C; rolling is performed for curing, wherein the curing temperature is kept at 40-50 DEG C, and the time is 48 h; the coating iscrystallized to form a coating film good in barrier property, and the PVDC coating thin film is obtained. Accordingly, design is optimized, and the design requirements are met.

Description

technical field [0001] The invention belongs to the field of product outer packaging materials, and in particular relates to a PVDC coating film and a manufacturing method thereof. Background technique [0002] PVDC (polyvinylidene chloride) film has become the best material choice for food packaging due to its excellent oxygen barrier, moisture barrier and high-temperature cooking performance; conventional PVDC film is a naturally laminated double-layer film produced by the inflation method , with a thickness of 40±2μm, which is mainly used as a sheet-shaped casing film; while the PVDC film used as a substrate film is a single layer, and the thickness is usually controlled to be 10-20μm. Therefore, when preparing a PVDC composite film, it is necessary to double-layer PVDC The film is separated; the traditional PVDC composite film preparation method is: first separate and then compound, that is, after the double-layer PVDC film roll is produced from the film workshop, the PV...

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Problems solved by technology

[0002] PVDC (polyvinylidene chloride) film has become the best material choice for food packaging due to its excellent oxygen barrier, moisture barrier and high-temperature cooking performance; conventional PVDC film is a naturally laminated double-layer film produced by the inflation method , with a thickness of 40±2μm, which is mainly used as a sheet-shaped casing film; while the PVDC film used as a substrate film is a single layer, and the thickness is usually controlled to be 10-20μm. Therefore, when preparing a PVDC composite film, it is necessary to double-layer PVDC The film is separated; the traditional PVDC composite film preparation method is: first separate and then compound, that is, after the double-layer PVDC film roll is produced from the film workshop, the PVDC single-layer film is obtained by cutting and layering rolls through the separation equipment, and then enters The lamination workshop carries out the compounding of PVDC composite films; however, due to the relatively large thickness deviation of the single layer of PVDC blown film, when the double-layer PVDC film is separated, longitudinal or oblique stripes are likely to occur in the thinner part; in addition, due to the gap between the two layers of film Electrostatic adsorption, the adsorption strength between the two layers of film is relatively high during separation, resulting in low separation speed of the double-layer film, usually 10-80m / min, which seriously affects the production efficiency of the PVDC substrate film; and the single-layer film is easy to roll when winding. Deformation produces wrinkles, and it is easy to affect the quality of the composite film because the single-layer film cannot be flattened in the subsequent compounding process. In severe cases, the entire roll of substrate will be scrapped, causing major losses to the production of the composite film

[0003] At present, many packages on the market are two-layer, three-layer and four-layer composite packaging bags made of BOPP, BOPET, BOPA, CPP, and CPE basic film materials after printing composite paper bags. Cannot meet market requirements

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