Thermal Shrinkage Film material lateral shrinkage rate analysis measures the transverse shrinkage length of the film based on changes in temperature and time. The calculated lateral shrinkage rate of the film has a positive dependence on the heating temperature and heating time during installation, and its trend with temperature and time changes The longitudinal shrinkage is similar, but the shrinkage rate may be different due to the different degree of lateral stretch. For example, the transverse thermal shrinkage of PE film is about 30% to 40%, while the transverse thermal shrinkage of PET can reach more than 70%, and the transverse thermal shrinkage of PVC is 40% to 45%. It is believed that the main reason for the above difference in transverse shrinkage is the difference in the transverse stretching of these films.
The cost of PVC Heat-shrinkable Film is moderate, and the shrinkage rate is relatively uniform, but the healing time is slightly longer. PVC (black) is slightly impurity, black, and PVC (blue) has good light transmittance. In production, different packaging materials can be selected according to cost and different design schemes, such as: for heat-shrinkable films with printed graphics and text, a balanced vertical and horizontal heat shrinkage ratio is required; for soft packaging, excessive heat shrinkage Rate, the object will be deformed; for cylindrical hard objects, a higher lateral heat shrinkage rate is required to make the film adhere to the object. And because the actual heat shrinkage rate of the heat-shrinkable film is often determined by the size of the packaged object, in the actual application of the heat-shrinkable film, it is not necessary to achieve its larger heat shrinkage rate, and it can be adjusted according to the actual requirements.
General properties of PVC Heat Shrink Sleeve Film:
Unitization: This is one of the biggest features of shrink film packaging. With the strong winding force and retractability of the film, the product is bundled compactly and fixedly into a unit, so that the small pieces become a whole, even if the product is in an unfavorable environment, there is no looseness and separation, and there is no sharpness The edges and stickiness to avoid damage. This news comes from Linyi Ming run Blow Molding Factory.
Primary protection: Primary protection provides the surface protection of the product, forming a very light, protective appearance around the product, so as to achieve the purposes of dustproof, oil proof, moisture-proof, waterproof and anti-theft. It is especially important that the wrapping film packaging makes the packaged items evenly stressed to avoid damage to the items due to uneven force, which is not possible with traditional packaging methods (bundling, packaging, tape, and another packaging).
The production of heat shrinkable film usually uses extrusion blow molding or extrusion casting method to produce a thick film, and then the longitudinal and transverse stretching are carried out at a high elastic temperature above the softening temperature and below the melting temperature, or only in One direction is stretch oriented, while the other direction is not stretched. The former is called biaxial stretch shrink film, and the latter is called unidirectional shrink film. When in use, when the temperature is greater than or close to the stretching temperature, the shrinkage force can reliably wrap the packaged goods.
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