The main function of the stretch film is to pack the goods together and wrap the scattered goods together to prevent loss. This stretch film packaging material is suitable for the logistics and transportation industry. In addition, the stretch film is moisture-proof, scratch-proof, and highly protective, because the tightness of the stretch film can protect the article. Today, the Zhiteng stretch film manufacturer will introduce you to the factors that affect the tightness of the stretch film.

 

1. Non-polar polymer, the surface free energy of the stretched film is small, and the surface wet tension is low, generally around 30 dyne/cm.

2. Polyester (polyester, polyethylene terephthalate, polyethylene terephthalate, PETG) is a polar polymer with high surface free energy and surface wetness higher than 40 dyne/cm tension.

3. The transfer of the aluminized layer will occur during aluminum plating, and the transfer of the glue layer will occur during glue coating.

 

Especially important is the packaging of stretch film, so that the packaged goods receive uniform force and avoid damage caused by uneven force. This is not possible with traditional packaging methods such as bundling, packaging, and tape. The stretched film after stretching has super winding force and elasticity, which can tightly bundle the product into a unit, making the scattered small pieces into a whole, even in unfavorable environments, the product will not be loosely separated , Without sharp edges and stickiness, to avoid damage to items.

 

At the same time, the stretching force of the stretch film is adjustable, which can make hard products fit each other and shrink soft products, especially in the tobacco industry and textile industry.

 

What problems may occur during the use of stretch film?

Friends who often use stretch film know that if the quality of the stretch film purchased is not good during use, there will often be a variety of failure problems. Today, in order to reduce the problem of failure during the use of stretch film, the following summarizes some of the problems that may occur:

1. Various volatiles gather on the top of the oven and air duct, and fall on the film.

2. The filter is damaged, the casting has high impurity content, and the extrusion and longitudinal stretching temperature settings are improper.

3. The crystallization and orientation deviation of the castings is too large, and there are obvious horizontal stripes and bubbles on the castings.

4. The chain clip is damaged during the production process.

5. The original contains impurities with large differences in performance (such as oil stains from low-molecular substances, etc.).

6. Various inconspicuous membrane-breaking factors (longitudinal thickness fluctuations, etc.) are further expanded, causing excessive strain in local areas.

7. The sealing head is leaking, the silo surface is broken, and the extrusion and longitudinal stretching temperatures are set improperly.

 

Stretch film has the characteristics of good tensile performance, tear resistance, strong penetration resistance, high transparency, good self-adhesiveness, high shrinkage rate, tight packaging, and no looseness. It can be widely used in chemical raw materials, fertilizers and foods. , Mechanical and electrical products, light textile products and other single-piece or pallet packaging and other bundled packaging.