Heat shrinkable film trademark use method and contraction principle

Heat shrinkable film trademark is a new trademark. Affected by the impact of imported beverage packaging, a shrink film used for trademark heat is rising domestic. The advantages of heat shrinkable film is heated to shrink after the trademark bottle, moisture can not enter the pattern not to damage, no wrinkles without convex phenomenon, and according to the shape of the object close to, make people feel fresh and natural, rich and elegant.

In order to make your understanding of the nature of the film, production processes, trends and other aspects of understanding, the author of this article, in order to peer.

Shrinkable film material and method of use

The name of PVC heat shrinkable film membrane (PVC heat shrinkable film color) is a transparent body, bright surface. Specific gravity of 1.16 ~ 1.35 (soft without filler).

Method of use: the shrink sleeve in the enclosed goods, near the heat source, heating moment at 60 DEG C to 150 DEG, can be close to. Heat source can use electric heating, steam, infrared. Heating form has spray type, electric hair dryer, oven and drying channel form.

Two, heating contraction principle

Ordinary plastic film macromolecules in a natural crimp state, generally does not shrink when heated. Collect conjunctiva situation is different, the film has gone through two steps, the raw material after melting at specified temperature and make the film stretching under the action of external force, large molecules between each other are not slip, not the natural state is frozen. At room temperature, the activity of plastic macromolecules is poor, and therefore can not rely on molecular motion to eliminate this unnatural state, which is room temperature thermal contraction film does not shrink reasons. However, this is only a surface phenomenon, this seemingly stable thermal contraction film inside has been hidden instability factors. When the heat shrinkable film re heated to a certain temperature, the frozen macromolecules will start to move again, never natural state trying to restore to the natural state, resulting in shrinkage. This phenomenon is the same with the elongated rubber band after relaxation and rebound in essence.