Shrink film application
DATE：2019/10/15 8:52:54 / READ： / SOURCE：This station
Shrink film application
The shrink film is produced in the same manner as the biaxially stretched film except that heat setting treatment is not required. The shrink film has a unidirectional shrink film and a biaxial shrink film. The unidirectional shrink film is suitable for the packaging of bundle products, such as stainless steel pipes, plastic pipes, bars and plastic decorative gussets, bamboo rafts, Christmas candles, pencils, stationery. Boxes, pens, etc., two-way heat shrinkable film is suitable for the packaging of any other non-tube-shaped products, such as: export refractory bricks, building materials and floor tiles.
All thermoplastics can be produced into a variety of shrink film for shrink packaging on different applications. For some heavy-weight products with solid weight, such as building materials, steel, non-ferrous metal parts, etc., mechanical strength can be used and shrinkage can be used. Shrink film of engineering plastics with large force and shrinkage, such as nylon, polyester and other shrink film. For light weight and regular shape goods, only ordinary general-purpose plastic shrink film, such as PE, P, PVC, PS and other shrink film, is needed. Products with sharp edges and corners, such as scissors, ribs, pig's trotters, etc., use shrink film packaging with high tear strength and good toughness, such as toughened PVC, Surlyn and other films. The shrink packaging of art ceramics and art glass products can be packaged with a softer shrink film and a tougher film, so that the edges and corners after shrinking are clear and easy to watch.
In general, the shrinkage properties of the film are related to the stretching ratio and the stretching orientation temperature in the high elastic state, in addition to the resin and the additive constituting the film. The shrinkage energy is the energy accumulated in the film during the stretching and orientation process. For industrial packaging, the total shrinkage is between 15 and 80%, generally only needs to shrink by 15 to 30%, and the peculiar shape can be shrunk to 5%. And more than 50%. For tube bundle products, it is only necessary to shrink in one direction. Japanese people like to use bamboo rafts to dry clothes, bamboo rafts have thrift, PVC heat shrinkable film (one-way shrink) can be placed on bamboo rafts, poured with boiling water, so that it shrinks tightly on the bamboo raft is relatively smooth, easy to use.
Taking full account of the strength and shape of the packaged goods, it is very important to prevent excessive shrinkage and shrinkage tension from crushing fragile goods. Some products can also use different temperatures to achieve multiple shrinkage at different levels to achieve satisfactory shrinkage. . First, slowly shrink to a low shrinkage rate at a lower shrinkage temperature, and then increase to a higher shrinkage rate at a higher temperature, preventing sudden overheating, excessive shrinkage, and deformation of the product. Goods are displaced or even crushed. For products with sharp edges and corners, this kind of stepwise shrinkage should be used to achieve satisfactory shrink packaging.
Because PET heat shrinkable film has high strength, large shrinkage force, good transparency and good printability, it is often used as a shrink label for plastic bottles. Because plastic bottles are more troublesome to print, special bottle printers are needed. Most of the labels for this general plastic beverage bottle are produced using a heat shrinkable film.
The shrink film is produced in the same manner as the biaxially stretched film except that heat setting treatment is not required. The shrink film has a unidirectional shrink film and a biaxial shrink film. The unidirectional shrink film is suitable for the packaging of bundle products, such as stainless steel pipes, plastic pipes, bars and plastic decorative gussets, bamboo rafts, Christmas candles, pencils, stationery. Boxes, pens, etc., two-way heat shrinkable film is suitable for the packaging of any other non-tube-shaped products, such as: export refractory bricks, building materials and floor tiles.
All thermoplastics can be produced into a variety of shrink film for shrink packaging on different applications. For some heavy-weight products with solid weight, such as building materials, steel, non-ferrous metal parts, etc., mechanical strength can be used and shrinkage can be used. Shrink film of engineering plastics with large force and shrinkage, such as nylon, polyester and other shrink film. For light weight and regular shape goods, only ordinary general-purpose plastic shrink film, such as PE, P, PVC, PS and other shrink film, is needed. Products with sharp edges and corners, such as scissors, ribs, pig's trotters, etc., use shrink film packaging with high tear strength and good toughness, such as toughened PVC, Surlyn and other films. The shrink packaging of art ceramics and art glass products can be packaged with a softer shrink film and a tougher film, so that the edges and corners after shrinking are clear and easy to watch.
In general, the shrinkage properties of the film are related to the stretching ratio and the stretching orientation temperature in the high elastic state, in addition to the resin and the additive constituting the film. The shrinkage energy is the energy accumulated in the film during the stretching and orientation process. For industrial packaging, the total shrinkage is between 15 and 80%, generally only needs to shrink by 15 to 30%, and the peculiar shape can be shrunk to 5%. And more than 50%. For tube bundle products, it is only necessary to shrink in one direction. Japanese people like to use bamboo rafts to dry clothes, bamboo rafts have thrift, PVC heat shrinkable film (one-way shrink) can be placed on bamboo rafts, poured with boiling water, so that it shrinks tightly on the bamboo raft is relatively smooth, easy to use.
Taking full account of the strength and shape of the packaged goods, it is very important to prevent excessive shrinkage and shrinkage tension from crushing fragile goods. Some products can also use different temperatures to achieve multiple shrinkage at different levels to achieve satisfactory shrinkage. . First, slowly shrink to a low shrinkage rate at a lower shrinkage temperature, and then increase to a higher shrinkage rate at a higher temperature, preventing sudden overheating, excessive shrinkage, and deformation of the product. Goods are displaced or even crushed. For products with sharp edges and corners, this kind of stepwise shrinkage should be used to achieve satisfactory shrink packaging.
Because PET heat shrinkable film has high strength, large shrinkage force, good transparency and good printability, it is often used as a shrink label for plastic bottles. Because plastic bottles are more troublesome to print, special bottle printers are needed. Most of the labels for this general plastic beverage bottle are produced using a heat shrinkable film.
Author：admin