The heat shrinkable film trademark is an emerging trademark. Due to the influence of imported beverage packaging, a shrink film for trademark heat is emerging in the country. The advantage of the heat shrinkable film trademark is that it adheres to the bottle after heating and shrinking, moisture cannot enter, the pattern will not be damaged, no wrinkles and no protrusions, and the shape of the object can be tightly affixed to make people feel novel and generous, full and elegant.
In order to make you understand the nature of the film, production process, development trends and other aspects, the author specifically for this article, in order to press the peer.
one. Shrink film material and method of use The film name PVC heat shrinkable film (PVC heat shrinkable film) base color is transparent, bright surface. The specific gravity is 1.16 to 1.35 (soft no filler).
How to use: 1 Put the shrink film on the packaged goods, make it close to the heat source, and heat it instantly at a temperature of 60°C～150°C to cling. 2 The heat source can be electric heating, steam, infrared. 3 The heating forms are spray air type, hair dryer type, oven and drying tunnel.
Second, the principle of heat generated by the shrinkage of ordinary plastic film macromolecules in a naturally curled state, generally does not shrink when heated. Condensation membrane is different, its filming has undergone two steps. After the raw material is melted, the film is stretched at the specified temperature and under external force. Macromolecules cannot slide with each other, and the unnatural state is frozen. . At room temperature, the mobility of plastic macromolecules is poor, and therefore it is impossible to eliminate this unnatural state by molecular motion. This is the reason why the heat shrinkable film does not shrink at room temperature. However, this is merely a superficial phenomenon. The stability of this heat-shrinkable film has been hidden by instability. When the heat-shrinking film is reheated to a certain temperature, the frozen macromolecules will start to move again and recover from the unnatural state to the natural state, resulting in shrinkage. This phenomenon is essentially the same as the elongate rubber band that springs back and then rebounds.
three. The printing process should pay attention to matters Shrink film printing methods and other materials are generally the same, the difference is that in the drying, layout, impact, ink, powder, solvents, storage, etc., should pay a little attention.
Drying: The film shrinks when exposed to heat, but since the raw material passes through the dryer for a short period of time, it generally does not have an effect. However, the dryer should be turned on immediately to shut off the power. Conditional manufacturers can reduce the heat and strengthen the cold air device. It should be dry when printed.
Layout: The trademark of the shrink film needs to be sealed and glued together. When the plate is made, the joint pattern should be widened to 2.4mm to prevent cracks at the intersection of the two ends and affect the appearance.
Impact: PVC heat-shrinkable film material has been corona-treated at the time of shipment and no impact is required during printing, otherwise printing will be affected.
Ink: The film is best printed with special heat shrinkable film inks, OPP printing inks or polyacrylonitrile plastic gravure inks.
Solvents: benzenes, esters, alcohols are not suitable.
Dusting: If printed with polyamide plastic ink. In the receiving or bonding machine should be added to the powder device (talc powder can, gypsum powder is not appropriate) to prevent the inner layer of ink cling, adhesion. If the air humidity is large, care should be taken. If you use special ink for shrink film, you do not need to add powder.
Raw materials: If the film is thick and thin, one or two rollers should be fixed during printing.
Raw material storage: Avoid contact with heat, chemical solvents, and needle hard materials during transportation and storage. The storage room must be kept cool, ventilated and dry. The storage period should not exceed six months.
In order to make you understand the nature of the film, production process, development trends and other aspects, the author specifically for this article, in order to press the peer.
one. Shrink film material and method of use The film name PVC heat shrinkable film (PVC heat shrinkable film) base color is transparent, bright surface. The specific gravity is 1.16 to 1.35 (soft no filler).
How to use: 1 Put the shrink film on the packaged goods, make it close to the heat source, and heat it instantly at a temperature of 60°C～150°C to cling. 2 The heat source can be electric heating, steam, infrared. 3 The heating forms are spray air type, hair dryer type, oven and drying tunnel.
Second, the principle of heat generated by the shrinkage of ordinary plastic film macromolecules in a naturally curled state, generally does not shrink when heated. Condensation membrane is different, its filming has undergone two steps. After the raw material is melted, the film is stretched at the specified temperature and under external force. Macromolecules cannot slide with each other, and the unnatural state is frozen. . At room temperature, the mobility of plastic macromolecules is poor, and therefore it is impossible to eliminate this unnatural state by molecular motion. This is the reason why the heat shrinkable film does not shrink at room temperature. However, this is merely a superficial phenomenon. The stability of this heat-shrinkable film has been hidden by instability. When the heat-shrinking film is reheated to a certain temperature, the frozen macromolecules will start to move again and recover from the unnatural state to the natural state, resulting in shrinkage. This phenomenon is essentially the same as the elongate rubber band that springs back and then rebounds.
three. The printing process should pay attention to matters Shrink film printing methods and other materials are generally the same, the difference is that in the drying, layout, impact, ink, powder, solvents, storage, etc., should pay a little attention.
Drying: The film shrinks when exposed to heat, but since the raw material passes through the dryer for a short period of time, it generally does not have an effect. However, the dryer should be turned on immediately to shut off the power. Conditional manufacturers can reduce the heat and strengthen the cold air device. It should be dry when printed.
Layout: The trademark of the shrink film needs to be sealed and glued together. When the plate is made, the joint pattern should be widened to 2.4mm to prevent cracks at the intersection of the two ends and affect the appearance.
Impact: PVC heat-shrinkable film material has been corona-treated at the time of shipment and no impact is required during printing, otherwise printing will be affected.
Ink: The film is best printed with special heat shrinkable film inks, OPP printing inks or polyacrylonitrile plastic gravure inks.
Solvents: benzenes, esters, alcohols are not suitable.
Dusting: If printed with polyamide plastic ink. In the receiving or bonding machine should be added to the powder device (talc powder can, gypsum powder is not appropriate) to prevent the inner layer of ink cling, adhesion. If the air humidity is large, care should be taken. If you use special ink for shrink film, you do not need to add powder.
Raw materials: If the film is thick and thin, one or two rollers should be fixed during printing.
Raw material storage: Avoid contact with heat, chemical solvents, and needle hard materials during transportation and storage. The storage room must be kept cool, ventilated and dry. The storage period should not exceed six months.
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