TPE thermoplastic elastomer blow molding in the medical device industry
TPE thermoplastic elastomer blow molding in the medical device industry. The molding method of TPE thermoplastic elastomer is mainly injection molding and extrusion, and blow molding is rare. At present, in the medical device industry, it is a trend to seek alternative materials for PVC breathing bags. In this respect, TPE compounding materials optimized for blow molding by foreign TPE manufacturers have successfully replaced PVC and applied to medical breathing bags.
The TPE is melted and extruded into a tubular shape called a preform.
2. Blow molding
The parison is clamped into a split mold, and one end of the tube is pressed and fused together. After that, air is blown in, and the air pressure is called the shape of the cavity.
3. Cool out the mold
After the TPE product is cooled and hardened, the mold is opened and the finished product is ejected.
(2) Basic physical properties of blow molding on TPE materials:
1. Higher melt strength and elongation properties
Ensure that the embryo has sufficient time to close the mold surrounding the extruded preform while being fully extended during inflation;
TPE should have good welding performance to ensure the strength of the fusion of one end of the preform.
Blow molding has high requirements on the physical properties of TPE materials, and the safety testing of materials in the medical industry is very strict. Therefore, at present, domestic TPE is used in blown medical breathing bags, and there is basically no mature application case. TPE Thermoplastic elastomers replace latex impregnated materials to produce breathing bags. The material does not contain PVC and latex, reducing the risk of skin allergic reactions.