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I. Performance characteristics
PVC heat shrinkable film is one of the early development and application of heat shrinkable film, in the packaging of goods have a wide range of applications, although it has encountered in recent years from the environmental protection aspects of strong pressure and polyolefin heat shrinkable film (POFC3) a great challenge, but PVC shrinkable film is still a large number of production, application, and occupies a relatively solid many traditional application areas.
Classification.
1. classified according to the different folding diameter, those with folding diameter ¡Ý150©L are called heat shrinkable films; those with folding diameter <150mm are called heat shrinkable sleeves.
2. According to the different fields of application, PVC heat shrinkable film tubing is divided into the following three categories.
D type: used for packaging of electrical and electronic components.
Y type: used for general goods packaging.
S type: used for contact food packaging.
II. Production process
In principle, any one of the following processes can be applied to produce PVC heat shrinkable film
1. Blow moulding method
The blow moulding process for the production of PVC heat-shrinkable film has two types: direct blow moulding method and secondary blowing method.
2. Calendering
Three-roller or four-roller calender calendering into thick film (blank film), and then preheating, transverse and longitudinal stretching (or only in the transverse or only in the longitudinal stretching), cooling to produce heat shrinkable film.
3. Extrusion casting method
Firstly, the thick film is produced by casting method, then heated, stretched horizontally and longitudinally (or only in the transverse direction or only in the longitudinal direction), and cooled to produce heat shrinkable film.
If you do not use boiling water heating, can be pending PVC extrusion of thick film, cooled to 90 ~ 120 ¡æ, directly after the second blowing (transverse blowing and longitudinal fast traction), you can also get the PVC heat shrinkable film, but this method is more than the use of the second heating, the second blowing method, the control of the process conditions is more difficult, the product's quality and stability is often inferior to the second heating, the second blowing of the product, therefore PVC heat shrinkable film production, this method is less used.
III. Performance characteristics and applications
1. The main characteristics of PVC heat shrinkable film
PVC heat shrinkable film is mainly characterized by high transparency, high gloss, excellent display effect on the packaged goods and printing performance is excellent, so the use of PVC heat shrinkable film packaging of goods, with the advertisement effect of soliciting customers; it is a low shrinkage temperature, can be in the temperature of 100 ¡æ to complete the shrinkage of the packaging, due to the low temperature of the heat shrinkage, can save the packaging is the energy consumption and can be used for a variety of items that can not withstand high temperature treatment of packaging; In addition, the PVC heat shrinkable film can be used for the packaging of various items. Packaging of various items that can not withstand high temperatures; In addition, PVC heat shrinkable film also has the advantages of lower cost, better economy, thus enhancing its competitiveness with other packaging materials, but with the development and application of polyolefin heat shrinkable film POFC3 in recent years, the importance of PVC heat shrinkable film has a tendency to decline.
2. Application of PVC heat shrinkable film
Compared with the PE heat shrinkable film applied in large quantities in the field of packaging, PVC heat shrinkable film has a very good effect on the display of commodities, so it is used in large quantities for the sale of commodities packaging, which is widely used in many fields such as daily necessities and small household electrical appliances, toys, fibre products, food and pharmaceuticals, etc. In addition to industrial packaging, there is also a certain amount of room for expansion, such as rust-proof PVC heat shrinkable film used to Packaging metal products can greatly extend its rust period (rust PVC heat shrinkable film packaged iron, at 49 ¡æ, 95% RH conditions, by hand 24h treatment, can be completely rust-free).
Nanjing Suminoe Precision Machinery Co., Ltd. has professional cast film production line, the company's main cast film manufacturing production line: TPU hot melt adhesive film production line, CPP/CPE cast film production line, EVA solar encapsulation adhesive film production line, PE sanitary breathable film production line, PVDF cast film production line, PP 3D film production line, medical blood purification film production line, multilayer co-extruded barrier film production line, LLDPE winding film production line and so on.
PVC heat shrinkable film is one of the early development and application of heat shrinkable film, in the packaging of goods have a wide range of applications, although it has encountered in recent years from the environmental protection aspects of strong pressure and polyolefin heat shrinkable film (POFC3) a great challenge, but PVC shrinkable film is still a large number of production, application, and occupies a relatively solid many traditional application areas.
Classification.
1. classified according to the different folding diameter, those with folding diameter ¡Ý150©L are called heat shrinkable films; those with folding diameter <150mm are called heat shrinkable sleeves.
2. According to the different fields of application, PVC heat shrinkable film tubing is divided into the following three categories.
D type: used for packaging of electrical and electronic components.
Y type: used for general goods packaging.
S type: used for contact food packaging.
II. Production process
In principle, any one of the following processes can be applied to produce PVC heat shrinkable film
1. Blow moulding method
The blow moulding process for the production of PVC heat-shrinkable film has two types: direct blow moulding method and secondary blowing method.
2. Calendering
Three-roller or four-roller calender calendering into thick film (blank film), and then preheating, transverse and longitudinal stretching (or only in the transverse or only in the longitudinal stretching), cooling to produce heat shrinkable film.
3. Extrusion casting method
Firstly, the thick film is produced by casting method, then heated, stretched horizontally and longitudinally (or only in the transverse direction or only in the longitudinal direction), and cooled to produce heat shrinkable film.
If you do not use boiling water heating, can be pending PVC extrusion of thick film, cooled to 90 ~ 120 ¡æ, directly after the second blowing (transverse blowing and longitudinal fast traction), you can also get the PVC heat shrinkable film, but this method is more than the use of the second heating, the second blowing method, the control of the process conditions is more difficult, the product's quality and stability is often inferior to the second heating, the second blowing of the product, therefore PVC heat shrinkable film production, this method is less used.
III. Performance characteristics and applications
1. The main characteristics of PVC heat shrinkable film
PVC heat shrinkable film is mainly characterized by high transparency, high gloss, excellent display effect on the packaged goods and printing performance is excellent, so the use of PVC heat shrinkable film packaging of goods, with the advertisement effect of soliciting customers; it is a low shrinkage temperature, can be in the temperature of 100 ¡æ to complete the shrinkage of the packaging, due to the low temperature of the heat shrinkage, can save the packaging is the energy consumption and can be used for a variety of items that can not withstand high temperature treatment of packaging; In addition, the PVC heat shrinkable film can be used for the packaging of various items. Packaging of various items that can not withstand high temperatures; In addition, PVC heat shrinkable film also has the advantages of lower cost, better economy, thus enhancing its competitiveness with other packaging materials, but with the development and application of polyolefin heat shrinkable film POFC3 in recent years, the importance of PVC heat shrinkable film has a tendency to decline.
2. Application of PVC heat shrinkable film
Compared with the PE heat shrinkable film applied in large quantities in the field of packaging, PVC heat shrinkable film has a very good effect on the display of commodities, so it is used in large quantities for the sale of commodities packaging, which is widely used in many fields such as daily necessities and small household electrical appliances, toys, fibre products, food and pharmaceuticals, etc. In addition to industrial packaging, there is also a certain amount of room for expansion, such as rust-proof PVC heat shrinkable film used to Packaging metal products can greatly extend its rust period (rust PVC heat shrinkable film packaged iron, at 49 ¡æ, 95% RH conditions, by hand 24h treatment, can be completely rust-free).
Nanjing Suminoe Precision Machinery Co., Ltd. has professional cast film production line, the company's main cast film manufacturing production line: TPU hot melt adhesive film production line, CPP/CPE cast film production line, EVA solar encapsulation adhesive film production line, PE sanitary breathable film production line, PVDF cast film production line, PP 3D film production line, medical blood purification film production line, multilayer co-extruded barrier film production line, LLDPE winding film production line and so on.