Repeated heat-sealing film for food and repeated heat-sealing packaging film of repeated heat-sealing film

Abstract

The invention discloses a repeated heat sealing film for food. The repeated heat sealing film is a three-layer co-extrusion blow molding film, and comprises a surface layer, a middle layer, and an inner layer which are laminated successively; the surface layer comprises the following raw materials in parts by weight: 50 to 60 parts of LLDPE, 40 to 50 parts of LDPE, 8 to 10 parts of modified MFC particles, 0.1 to 0.2 part of PPA particles, 1 to 2 parts of a flow promoter, 0.1 to 0.5 part of an anti-blocking agent, and 0.5 to 1 part of a slipping agent; the middle layer is prepared from the following raw materials in parts by weight: 50 to 60 parts of LLDPE, 40 to 50 parts of LDPE, 4 to 8 parts of modified MFC particles and 0.5 to 1.5 parts of a flow promoter; and the inner layer comprises the following raw materials in parts by weight: 50-60 parts of LLDPE, 40-50 parts of LDPE, 8-10 parts of modified MFC particles, 0.1-0.2 part of PPA particles and 1-2 parts of a flow promoter. The repeated heat-sealing packaging film for food and the repeated heat-sealing packaging film thereof provided by the invention have good processability, improved heat resistance and mechanical strength; a wide heat-sealing temperature range is achieved; effectively reduced stripping force of a heat-sealing interface is achieved; and good repeated uncovering-heat-sealing performance is achieved.

Description

technical field [0001] The invention relates to the technical field of packaging, in particular to a repeatedly heat-sealable film for food and its repeatedly heat-sealed packaging film. Background technique [0002] PE film is polyethylene film, which is often used in the packaging of various foods. Traditional PE film is first made into a PE film packaging bag, and then the product is filled into the packaging bag. The heat sealing film on both sides of the packaging bag is heat-sealed. Can be well preserved and maintain product quality. [0003] However, the heat-sealed side of the current food packaging bag cannot be opened, and consumers need to tear the gap on the packaging bag to take the product from the gap; but when the food (such as tea) cannot be used at one time or the packaging volume However, when the amount to be taken at one time is small, the size and volume of the packaging bag will become smaller if the tearing gap is used to unpack it, which is not cond...

AI Technical Summary

Problems solved by technology

[0003] However, the heat-sealed side of the current food packaging bag cannot be opened, and consumers need to tear the gap on the packaging bag to take the product from the gap; but when the food (such as tea) cannot be used at one time or the packaging volume However, when the amount to be taken at one time is small, the size and volume of the packaging bag will become smaller if the tearing gap is used to unpack it, which is not conducive to re-sealed storage and carrying. To achieve repeated sealing, it is generally necessary to add functional components to achieve it. resealable effect

These newly added parts have some disadvantages. First, some newly added parts cannot achieve the effect of complete sealing, which shortens the food storage time in the packaging bag and deteriorates the food quality; secondly, the newly added parts increase more The production cost of the packaging bag, and even the added components are higher than the value of the packaging bag itself or the product inside the packaging bag, which will further increase the consumption cost of consumers; Combination, which seriously affects the production efficiency of packaging bags