Briefly describe the past, present and future of heat shrinkable film

Shrink film is a thermoplastic film that is stretched and oriented during production and shrinks during use
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Heat shrinking of films was used as early as 1936, initially mainly with rubber films to shrink and package perishable foods
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 Production Process Shrink film is usually produced by extrusion blow molding or extrusion casting to produce thick film, which is then stretched vertically and horizontally at high elastic temperatures above the softening temperature and below the melting temperature, or only in one direction and the other The direction is not stretched, the former is called biaxially stretched shrink film, and the latter is called unidirectional shrink film
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In use, when the stretching temperature is greater than or close to the stretching temperature, the reliable shrinkage force will wrap the packaged goods
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Types of heat shrinkage Various thermoplastic films are mainly used for heat shrinkable films
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Initially, it was mainly based on PVC heat shrinkable film
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In recent years, with the continuous development of the market and people's attention to environmental protection issues, the pollution problems caused by non-recyclable PVC heat shrinkable films and incineration have gradually decreased.
Various polyethylene, polyethylene, polyethylene, polyvinyl chloride, Multi-layer co-extruded heat-shrinkable films such as polyvinyl chloride have developed rapidly and have become the mainstream of the market
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POF is a substitute for traditional PVC heat shrinkable film.
As an environmentally friendly material, PET heat shrinkable film is easy to recycle and has a broad development space
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 PE heat shrinkable film PE heat shrinkable film is widely used in the overall packaging of wine, canned food, mineral water, various beverages, fabrics and other products
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The product has good flexibility, impact resistance and tear resistance, is not easy to damage, not afraid of moisture, and has a high shrinkage rate
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 PVC shrinkable film PVC heat shrinkable film is made of PVC resin mixed with more than a dozen accessories and then inflated for the second time
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Stretch packaging saves raw materials than shrink packaging, does not require a heat shrink packaging machine, and saves energy
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However, it is easy to vacuum, has a short service life and is easy to age, so its market share gradually declines
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 POF heat shrinkable film With the continuous changes in market demand, heat shrinkable film is developing in a multi-layered and functional direction, and many new technologies and new products have appeared
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Multi-layer co-extrusion composite heat shrinkable film (POF) with linear low density polyethylene as the middle layer, co-extruded polypropylene as the inner and outer layers, has the advantages of PE and PP, is better than single-layer PE or PP film, is the world's Widely used heat shrink packaging material
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Single-layer heat-shrinkable film is widely used in fast food pasta, and multi-layer heat-shrinkable film is also widely used in the packaging of fresh meat and fatty foods
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 PET heat shrinkable film PET heat shrinkable film has become an ideal substitute for PVC heat shrinkable film in developed countries, because it is easy to recycle, non-toxic, tasteless, good mechanical properties, especially in line with environmental protection characteristics
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It is stable down, shrinks when heated, and shrinks more than 70% in one direction
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Rainproof, moistureproof, mildewproof rain, moistureproof, mildewproof
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No recovery, with a certain anti-counterfeiting function
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In recent years, with the rapid development of PET beverage bottles, beverage bottles such as Coke, Sprite, and various juices require PET heat shrinkable film as a heat seal label, which belongs to polyester, is an environmentally friendly material and is easy to recycle
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It is used for various PET bottled beer and beverage labels, which can reduce the process of removing labels and facilitate recycling
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 　　At present, the annual demand for heat shrinkable films in the food, beverage, cosmetics and pharmaceutical industries in China is about 1 million tons, but there are few PET heat shrinkable films, which are mainly imported from abroad
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Therefore, the domestic PET heat shrinkable film only accounts for 1.
5% of the market demand, which is far from meeting the replacement requirements of the country to eliminate PVC and other heat shrinkable films
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Heat shrink labels are mainly used in heat shrink packaging and are currently growing rapidly and their market share is expanding
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The annual growth rate is expected to remain at around 15%, far exceeding the growth rate of the general label market, with huge development potential
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Therefore, heat shrinkable labels are becoming one of the biggest bright spots in the label industry
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