Preform

Preform

A plastic pre- shaped part produced by injection moulding systems in the first step of a two-stage injection moulding and blow moulding process used to produce bottles or containers. The preform is subsequently re-heated and stretch blown through a blow moulding process into the final container shape.

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Part of Speech: noun
Synonym(s):
Blossary:
Industry/Domain: Manufacturing
Category: Plastic injection molding
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Acronym-Abbreviation:

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Related terms

preform

Anthropology; Cultural anthropology

An early preliminary stage in the reduction-manufacture of a flaked stone artifact.

preform

Manufacturing; Plastic injection molding

A plastic pre- shaped part produced by injection molding systems in the first step of a two-stage injection molding and blow molding process used to produce bottles or containers. ...

preform

Textiles; Manufactured fibers

1. Fabrics that have been stacked in multiple layers and bonded with a stitching yarn or by other means. The preform may be cut into a shape for subsequent molding into a ...

preform

Automotive; Vehicle equipment

Compact mass of premixed plastic material that has been prepared for convenient handling and control of uniformity during the mold loading process.

preformative

Language; Dictionaries

A formative letter at the beginning of a word.

preform

Language; Dictionaries

To form beforehand, or for special ends.

stress-strain curve

Manufacturing; Plastic injection molding

The curve plotting the applied stress on a test specimen versus the corresponding strain. Stress can be applied through shear, compression, flexure, or tension.

stress relaxation

Manufacturing; Plastic injection molding

The decay of stress at a constant strain.

linear mold shrinkage

Manufacturing; Plastic injection molding

The difference between the size of the part and the size of the mold cavity. Values given are often the average of a range.

shrinkage allowance

Manufacturing; Plastic injection molding

The dimensional allowance which must be made in molds to compensate for shrinkage of the plastic compound on cooling.

screw travel

Manufacturing; Plastic injection molding

The distance the screw travels forward when filling the mold cavity.

underflow

Manufacturing; Plastic injection molding

The dominant flow of two confronting flows, over the other. The lesser flow reverses direction giving poor surface appearance and structural strength. Underflow should be avoided ...