Blow Mould

Blow molding is a process that converts a hollow parison (or preform) into a shaped container by deforming it under air pressure against a blow mould. Blow molding processes involve shaping while the material is in a molten state, but the melt, glass or polymer, has cooled enough that the viscosity is higher than for other melt-based processes discussed in this chapter. The process has ancient origins. Glass blowers began creating useful shapes by early versions of these methods about 3000 years ago. Today, both glass and polymer containers are made in highly automated versions of this ancient art.

Regardless of material type, blow molding has three key steps. First a controlled quantity of melt is made into parison or preform. Next, the parison is forced against a mold to increase the container volume and define the shape. Last, the molded object is cooled to retain the shape. Blow molding makes use of the steadily increasing viscosity of the glass or thermoplastic polymer melt as it cools. The viscosity of the material at the point of “blowing” must be in the appropriate range for easy deformation against the mold without gross flow under gravity, and the rate of cooling after this point must be fast enough to raise the viscosity to levels that are necessary to retain the shape. The processes themselves are highly nonisothermal with a hot melt cooling continuously throughout, but they are also automated and reproducible.

There are a lot of parts can be made by blow moulds in a vehicle like IP duct, defrost duct, reserve tank, air filter duct, side EA pad, bumper & bumper absorb, floor spacer, engine under cover, washer tank, roof duct, rear cooler duct, spoiler, cargo floor board, seat side table, seat back board, rear heater duct.etc..And here to introduce some:

Bumper Blow Mould

Major blow molding product over 2m;

High viscosity material hard to crack;

Realizing smooth curved shape;

Double wall structure with high rigidity.

Molding, sanding, painting possible;

Possible to assemble stop lamp utilizing the hollow;

Realizing smooth curved shape rigidity.

Much lighter than normal duct;

Better heat insulation and to reduce condensation;

Foaming rate can be controlled.

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