Production method of shrink film
DATE：2019/7/3 10:32:20 / READ： / SOURCE：This station
Production method of shrink film
The shrink film is all unidirectional or biaxially stretched film, so it can be considered as one-way stretching or two-way stretching.
The stretched film can be obtained by stretching the film in a production process without performing a heat treatment process. The production methods described in the above sections are almost always produced by tubular film biaxial stretching, while the flat film biaxial stretching method can also produce bidirectional shrink film, and uniaxial stretching produces only one-way shrink film. In recent years, a co-extrusion shrink film has been developed.
Properties and types of shrink film
Shrink film, in addition to the characteristics of general packaging film, also consider shrinkage (longitudinal and transverse), shrinkage temperature
1. Properties of shrink film
Shrinkage tension and heat sealability. This depends on the type of resin, grade, processing method, processing conditions and other factors.
(1) Shrinkage shrinkage temperature range The longitudinal and transverse shrinkage at each point is very important. For example, even at 120 ° C, the shrinkage rate is the same, but at other high temperatures, the shrinkage rate is different, in actual shrinkage. , it will also cause problems.
(2) Shrinkage tension and shrinkage tension at shrinkage temperature have a great influence on shrinkage workability and product protection after shrinkage. Different packaging products have different allowable ranges of shrinkage tension, and it is no problem that the shrinkage tension of a product similar to a metal can exists. In the case of paper products, the shrinkage tension is not good.
(3) The shrinkage temperature has a wide range of shrinkage temperature, and shrinkage at low temperature and good film workability have no adverse effect on the contents, but the surface temperature of the fruit fiber product rises only a few degrees even through the shrinkage channel, so there is no questionable.
(4) Before the heat sealability passes through the heat shrinkage passage, both sides must be sealed and sealed on three sides. Therefore, the film has a wide heat sealing temperature range and high heat seal strength.
The shrink film is all unidirectional or biaxially stretched film, so it can be considered as one-way stretching or two-way stretching.
The stretched film can be obtained by stretching the film in a production process without performing a heat treatment process. The production methods described in the above sections are almost always produced by tubular film biaxial stretching, while the flat film biaxial stretching method can also produce bidirectional shrink film, and uniaxial stretching produces only one-way shrink film. In recent years, a co-extrusion shrink film has been developed.
Properties and types of shrink film
Shrink film, in addition to the characteristics of general packaging film, also consider shrinkage (longitudinal and transverse), shrinkage temperature
1. Properties of shrink film
Shrinkage tension and heat sealability. This depends on the type of resin, grade, processing method, processing conditions and other factors.
(1) Shrinkage shrinkage temperature range The longitudinal and transverse shrinkage at each point is very important. For example, even at 120 ° C, the shrinkage rate is the same, but at other high temperatures, the shrinkage rate is different, in actual shrinkage. , it will also cause problems.
(2) Shrinkage tension and shrinkage tension at shrinkage temperature have a great influence on shrinkage workability and product protection after shrinkage. Different packaging products have different allowable ranges of shrinkage tension, and it is no problem that the shrinkage tension of a product similar to a metal can exists. In the case of paper products, the shrinkage tension is not good.
(3) The shrinkage temperature has a wide range of shrinkage temperature, and shrinkage at low temperature and good film workability have no adverse effect on the contents, but the surface temperature of the fruit fiber product rises only a few degrees even through the shrinkage channel, so there is no questionable.
(4) Before the heat sealability passes through the heat shrinkage passage, both sides must be sealed and sealed on three sides. Therefore, the film has a wide heat sealing temperature range and high heat seal strength.
Author：admin