The Characteristics Of The Biaxially Stretched Film
DATE：2019/8/29 8:48:57 / READ： / SOURCE：This station
The characteristics of the biaxially stretched film are:
1. The biaxially stretched film has a high strength. The film is stretched in the longitudinal direction and the transverse direction in a high elastic state, and the physical and mechanical strength is improved many times. A thin film can be used to obtain a high performance, and the resin can be greatly saved. To this end, biaxial stretching technology has developed rapidly since its development in the early 1970s, and its products are widely used in the packaging industry.
2. Biaxial stretching causes the polymer molecules to be oriented in the direction of stretching. This orientation promotes the crystallization of the polymer, increases the crystallinity of the polymer, and makes the crystal particles of the polymer fine, precisely because of crystallization. Finely formed, the fine crystals formed do not block the transmission of sunlight, and thus the transparency of the biaxially stretched film is improved.
3. After the film is biaxially stretched, the density is increased, and the moisture resistance and gas barrier properties are improved.
4. The tearing strength of the biaxially stretched film is improved, but the secondary tearing strength is greatly reduced, and only a small amount of force is required to tear the notched oriented film to the end, using this in various composite packagings. Various shapes of cuts are made in the bag to facilitate tearing when applied.
5. The oriented film is not heat-sealable. In order to make the oriented film heat-sealable, the following methods must be used: (1) Coating the heat-sealable material on the produced oriented film, such as PVDC latex, EVA latex, EVA solvent. (2) extrusion coating EVA, EAA and other heat sealable materials; (3) coextruded thermoplastic elastomer, after the biaxial stretching, the rubbery amorphous polymer does not lose heat sealability, Thereby the surface of the biaxial orientation object is heat sealed.
1. The biaxially stretched film has a high strength. The film is stretched in the longitudinal direction and the transverse direction in a high elastic state, and the physical and mechanical strength is improved many times. A thin film can be used to obtain a high performance, and the resin can be greatly saved. To this end, biaxial stretching technology has developed rapidly since its development in the early 1970s, and its products are widely used in the packaging industry.
2. Biaxial stretching causes the polymer molecules to be oriented in the direction of stretching. This orientation promotes the crystallization of the polymer, increases the crystallinity of the polymer, and makes the crystal particles of the polymer fine, precisely because of crystallization. Finely formed, the fine crystals formed do not block the transmission of sunlight, and thus the transparency of the biaxially stretched film is improved.
3. After the film is biaxially stretched, the density is increased, and the moisture resistance and gas barrier properties are improved.
4. The tearing strength of the biaxially stretched film is improved, but the secondary tearing strength is greatly reduced, and only a small amount of force is required to tear the notched oriented film to the end, using this in various composite packagings. Various shapes of cuts are made in the bag to facilitate tearing when applied.
5. The oriented film is not heat-sealable. In order to make the oriented film heat-sealable, the following methods must be used: (1) Coating the heat-sealable material on the produced oriented film, such as PVDC latex, EVA latex, EVA solvent. (2) extrusion coating EVA, EAA and other heat sealable materials; (3) coextruded thermoplastic elastomer, after the biaxial stretching, the rubbery amorphous polymer does not lose heat sealability, Thereby the surface of the biaxial orientation object is heat sealed.
Author：admin