pallet stretch film Permeability

pallet stretch film Air permeability is mainly expressed by the transmission of gas and gas transmission coefficient. The air permeability test of stretch film is carried out on a special instrument. The method is to separate the high pressure chamber from the low pressure chamber by the detected stretch film and seal it well. In the high pressure room, there is about 105Pa of the test gas. The volume of the low pressure chamber is known. The pressure of the low pressure indoor air is pumped out with a vacuum pump at the beginning of the test. Attention should be paid to the following items when doing stretch film permeability test.

1. The constant temperature should be strictly controlled in the experiment.

2. The degassing and air permeability in the test process will take a long time. The detection of the pressure in the low pressure chamber should be recorded after achieving stable transmission.

The test process is carried out under the condition of pressure difference between the two high and low pressure chambers. So, in order to ensure the accuracy of the test data, we must pay attention to the sealing property of the system in the working instrument.

pallet stretch film is usually made from PE membrane material with adhesive additives, such as PIB masterbatch, cast by tape casting. The surface is slightly sticky and can stick to itself. So its performance decides that it has wide application in transportation industry. What kind of role does it play?

Stretch film applies to the outer packing of valuables, which can effectively guard against theft. Stretch film has the functions of moistureproof, dustproof, prohibiting solid and preventing loss. It is widely used in carton pallets, strip building materials, food packaging, glass ceramics, fertilizer cement, resin raw materials, cloth, empty cans and other packaging. Stretch film is used in the sales and transportation of various products. Its main function is to stabilize, cover and protect products. Stretch film must have high puncture resistance, good shrinkage and certain shrinkage stress. During shrinkage, pallet stretch film can not generate holes. Because stretch film is often applied to outdoor, UV anti UV agent is needed.

Especially in the combination of irregular shape or goods or goods, it can not only meet the functions of moisture proof and dust prevention, anti touch exchange, transparent display, but also can increase the appearance attraction of the products, and can also be used to replace all kinds of cartons, not only save the cost of packaging, but also meet the packaging trend.

When we use the stretch film produced by stretch film manufacturers in China for a period of time, there will be a wrinkle, which has a great impact on our use, so what is the cause of the wrinkle in stretch film?

1. The thickness of stretch film substrate is uneven, and the thickness difference is too large.

2, the position of the substrate is skewed, resulting in wrinkles of the composite film, and the degree of folds will increase correspondingly with the accumulation of skewness.

3, tension settings and improper control, tension of each part is not coordinated, do not match.

4. Improper setting of pallet stretch film composite pressure is easy to cause wrinkles.

5. The axis between silicon rubber roller and cooling steel roller is not parallel.

6, the surface of the guide roller is not clean, sticky with foreign bodies, or the surface of the guide roller is uneven, with pits, scratches, and bruises.