Method for producing polyethylene resin film

Abstract

In order to efficiently and stably produce a polyethylene resin film having excellent heat sealability, and in addition, excellent appearance and scratch resistance, the present invention provides a method for producing a polyethylene resin film, the method comprising: a step for melt-kneading a polyethylene resin composition containing particles of a polyethylene resin, and a polyethylene resin;a step for melt-extruding the polyethylene resin composition to form a melted polyethylene resin composition sheet; and a step for cooling and solidifying the melted polyethylene resin composition sheet, wherein the step for melt-kneading the polyethylene resin composition includes a step for performing filtration using a filter having a filtration accuracy of 100 [mu]m or less.

Description

Technical field [0001] The present invention relates to a method for producing a polyethylene resin film. More specifically, it relates to a method for producing a polyethylene resin film that is excellent in stable blocking resistance or stable sliding properties, and also excellent in appearance and scratch resistance. Background technique [0002] In recent years, packaging or containers using films have gradually been used in a wide range of fields due to convenience, resource conservation, and reduction in load on the environment. Compared with conventional molded containers and molded products, the film has the advantages of light weight, easy disposal, and low cost. [0003] For example, in general, a sealing film is usually laminated and used with a base film such as a biaxially stretched nylon film, a biaxially stretched ester film, and a biaxially stretched polypropylene film, which has lower low-temperature thermal adhesion than the sealing film. When storing in roll f...

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Problems solved by technology

[0005] However, this countermeasure has the following problems: not only the surrounding area of ​​the film processing equipment is polluted, but also the appearance of the packaged food is significantly deteriorated, or the powder adhering to the sealing film is directly mixed into the package together with the food, or the heat seal strength is lowered.

[0007] However, this countermeasure also has the following problems: when the film surfaces containing inorganic fine powders such as aluminum oxide and silicon dioxide added to the polyethylene film or inorganic particles rub against each other, scratches are easily generated, and when the sealing film or the base film When the laminated body passes through a laminator, a bag-making machine, etc., the inorganic fine powder or inorganic particles are easy to fall off when in contact with the local part of the machine (for example, refer to Patent Document 1

At this time, if the inorganic particles and cross-linked organic particles aggregate to clog the mesh of the filter, the filter must be replaced, resulting in a decrease in workability and an increase in cost.

In addition, if a filter with a low filtration precision is used with priority given to the extrusion speed, the so-called gel removal will be insufficient, and there will be problems such as increasing gel defects over time and degrading the quality.

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