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Injection Blow Moulding

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Definition of Blow molding

Blow molding is a common process for production of hollow containers, ranging from commodity products such as soda or water bottles to highly engineered products such as gas tanks and electrical enclosures. The two most common types of blow molding are extrusion blow molding and injection blow molding with many variants related to handling of the parison and molds.

Blow molding processes:

Three main types of blow molding

Extrusion Blow Molding

Take melted plastic

Extrude the parison with compressed air into the mold

Features two variations: continuous and intermittent

Blow Molding

u Produce small medica and single-serve bottles

Large quantities of hollow glass and plastic objects

u Via pin to blow air into mold to inflate and cool the product

Restriction on the bottle design, only allowing a champagne base to be made for carbonated bottles.

Injection stretch molding

Injection stretch molding is suitable for cylindrical, rectangular, or oval bottles and has two different main methods, notably the single-stage and two-stage processes

With the single-stage method,

the same machine is used to both preform manufacture and bottles blow the object. This method is highly suitable for low volumes and short runs

In the case of the two-stage process,

the plastic is first molded into a [preform" using the Injection Molding process. The [preforms" are then packaged and fed after cooling into a reheat stretch blow molding machine. While a high capital cost and a large floor footprint are necessary, injection stretch molding can produce very high volumes and feature minimal restrictions on bottle design. The bottles can also be a completed item for a third party to blow

Materials: PE, PVC, PC, PP, PS

Applications:

l To produce bottle-shaped, hollow thin-wall molding products and bulky products, such as seasoning, water bottles, cleaning agents, shampoo and other packaging supplies

l And produce trash cans, gasoline cans, and even the capacity of up to a ton of chemical barrels and fishing products transport boxes

Advantages

l Thin wall forming products, materials and cost saving

l Low cost of mold, rich mold materials  

l Can produce large, complex shape hollow products  

Disadvantages

l Low dimensional accuracy  

l Thickness of the forming product wall is difficult to control and easy to have uneven problem

l Product surface is prone to flow marks, rough but not delicate  

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