Antifreezing speed-sealing film and preparation method thereof

Abstract

The invention discloses an anti-freezing film capable of being quickly sealed and a preparation method thereof. The film is formed by composition of biaxial tension polypropylene and a polypropylene film, wherein the polypropylene film consists of a corona layer, an intermediate layer and a heat-sealing layer; the heat-sealing layer comprises metallocene three-element blocking polypropylene, an ethylene elastomer, an antitackiness agent and a slip agent the weight ratio of which is 50-86.5: 18-20: 1-2: 1-1.5. The preparation method comprises the following steps in turn: a step of extrusion, a step of solidifying a sharp cooling roller, a step of cooling, a step of thickness measurement, a step of corona, a step of swing, a step of edge cutting, a step of composition of BOPP and CPP and a step of forming a spiral-wound film through cutting. Compared with the prior art, the anti-freezing film capable of being quickly sealed has the characteristics of good anti-freezing property, cold resistance and mechanical performance, obvious shock resistance effect and penetration resistance effect, low initial sealing temperature, short heat-sealing time and high sealing intensity, and is suitable for a modern quick automatic packaging unit.

Description

technical field [0001] The invention belongs to the technical field of film and its preparation method, in particular, it belongs to the antifreeze quick-sealable film and its preparation method for various foods such as rice, fruits and vegetables, seafood, meat products, cooked food, glutinous rice balls, buns, cold drinks, etc. . Background technique [0002] The frozen and refrigerated food industry is one of the fastest growing food industries in the world in recent years, and it is also developing very rapidly in China. At present, the common frozen packaging in our market is mostly used: OPP / LLDPE, NY / LLDPE, PET / LLDPE, PET / VMPET / LLDPE, PET / NY / LLDPE and other structures. This kind of packaging is prone to the following problems: (1) The impact resistance of the packaging bag is poor, and it is easily damaged by external forces during transportation, loading and unloading, and shelf placement, and it is very easy to break the bag and open the bag, which not only affect...

AI Technical Summary

Problems solved by technology

This kind of packaging is prone to the following problems: (1) The impact resistance of the packaging bag is poor, and it is easily damaged by external forces during transportation, loading and unloading, and shelf placement, and it is very easy to break the bag and open the bag, which not only affects the quality of the packaged product. At the same time, it cannot play the role of the packaging itself.

(2) The smoothness of the packaging bag itself is not good, and the opening performance is poor during the production process, and the production efficiency is low. At the same time, the utilization rate of the packaging bag will also be reduced, which will cause waste of cost

(3) The heat-sealing strength of ordinary packaging bags is less than 20N / 15mm. When the heat-sealing temperature is too high, it is easy to cause damage to the heat-sealing layer, resulting in reduced protection performance of the packaging bag, greatly shortening the shelf life of the contents, and making the contents up to Less than the corresponding shelf life

(4) The interlayer peeling strength of the packaging bag is less than 1.0N / 15mm, so the breaking force is not enough, the mechanical properties of the packaging bag are poor, the packaging bag is layered, the packaging bag cannot achieve the proper load-bearing effect, and cannot play a role in the content. to effective protection

(5) The cold resistance of the packaging bag does not meet the requirements. When the temperature is below -20°C, the original performance of the material cannot be maintained. The packaging material is brittle, which reduces the mechanical strength of the packaging material, causing the packaging bag to break and crack. Can not meet the protection of the contents

(6) The function of the easy-to-tear opening of the packaging bag cannot be effectively exerted, and the tear strength is greater than 500N / mm, which makes the packaging bag difficult to open. (7) The puncture performance of the packaging bag is less than 1.0N / μm, and frozen food is generally It is relatively hard, especially fish and meat products, which contain bones and hard objects. The extrusion of the product during transportation and stacking can easily break the packaging bag and damage the sealing of the packaging bag. Therefore, the puncture performance of the packaging bag for frozen food is required very high

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