Different shape shrink film labels and manufacturing process

Due to the different bottle shape, different bottle body shrinkage process has different attention points.  
 
At present, the shrinkage process mainly includes: water bath method, electric heating method and steam method.  From a practical point of view, the steam process has advantages in terms of shrinkage effect and production efficiency.  
 
Small on top and big on bottom bottle type, used in food industry, such as peanut butter, milk, juice and so on.  The best solution for this type of bottle heat shrinkage is to use a steam process.  First shrink the bottom, the shrinkage stress should be the maximum, to prevent from being affected by the upward vector stress generated in the process of upward shrinkage, the trademark will move up, resulting in the defect of the lower part of the bottle is not covered.  
 
Bottle shape, large upper body, small lower body, used in cup instant noodles and ice cream industry.  This kind of cup has a smooth surface without bumps.  Generally, the electric packaging process of empty packaging is used for trademark contraction.  Because the heat source position can not be adjusted, so in the upper and lower parts of the contraction.  At this point, the label will move down due to the vector stress generated during the contraction process.  This phenomenon can be eliminated fundamentally by changing the local cup shape.  
 
The two big and one small bottle is mainly used in milk, beverage and other industries.  Such bottles are usually treated by steam.  If the electric heating process is difficult to control, it is difficult to prevent the label from moving to the middle.  In the use of steam, also in the following middle order to shrink.  If the surface of the bottle is smooth without vertical stripes, it is necessary to make some ventilation holes on the surface of the label to avoid air accumulation in the middle of the label.  
 
The two small and one big bottle is mainly used in the beverage industry.  Such bottles are generally made by steam process and shrink in the order of "middle, bottom and top" to ensure the accuracy of label position.  
 
Heat shrinkable film as a label packaging material has unique advantages: saving forest resources, reducing costs, moisture-proof, sanitation, easy to use;  Packaged products are beautiful and space-saving, suitable for mass production.  Suitable for all kinds of products.