Repeated sealing packaging film for food, and preparation method thereof

Abstract

The invention discloses a repeated sealing packaging film for food. The repeated sealing packaging film comprises an outer layer, a middle layer, a cold bonding layer and a heat sealing layer which are sequentially stacked from outside to inside, wherein the cold bonding layer is prepared from the following components in parts by weight: 30 to 50 parts of a thermoplastic elastomer, 10 to 20 partsof a tackifying resin, 18 to 20 parts of an acrylic copolymer, 10 to 12 parts of coupling agent modified calcium carbonate hollow particles, 15 to 18 parts of a copolyester adhesive and 3 to 4 parts of an auxiliary agent, and the heat sealing layer is prepared from the following components in parts by weight: 50 to 58 parts of LLDPE, 40 to 50 parts of LDPE, 1 to 1.5 parts of an anti-blocking agentand 0.3 to 0.5 part of a slipping agent. According to the repeated sealing packaging film for the food, the formula of the cold bonding layer of the packaging film is designed, the coupling modifiedcalcium carbonate hollow particles, the copolyester adhesive and various other components are added, and the components and the main machine have a synergistic effect, so that the food packaging filmhas excellent low-temperature resistance, and the sealing effect of repeated sealing can be kept after multiple times of low-temperature refrigeration or freezing.

Description

Technical field [0001] The invention relates to the technical field of food packaging films, and in particular to a repeated sealing packaging film for food and a preparation method thereof. Background technique [0002] In recent years, packaging containers and packaging films for various foods have developed rapidly, and packaging films that are easy to tear, easy to peel off and can be re-sealed have appeared one after another. The resealable packaging film is heat sealed through the internal heat sealing layer. When it is opened for the first time, the heat sealing layer is separated from the cold adhesive layer of the packaging film. When sealing next time, you only need to press hard to uncover the part. There is no need to heat seal the previous heat sealing area, especially for some foods that cannot be eaten at one time and need to be sealed and packaged again. The resealable packaging film improves the convenience and ease of use of this food to a higher level. Hi...

AI Technical Summary

Problems solved by technology

[0003] However, many foods that have not been eaten once or several times and need to be sealed and packaged again, such as chocolate, ice cream or jujube cake, etc., in addition to needing to be sealed and packaged again, also need to be refrigerated or frozen again. After many resealable packaging films are refrigerated or frozen for many times, the resealing performance of the packaging film is seriously reduced, and even the second or third sealing cannot be performed.

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