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Z94.12.6 Plastics

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INHIBITOR. A substance which prevents or retards a chemical reaction.

INJECTION BLOW MOLDING. A blow molding process in which the parison to be blown is formed by injection molding and then blow molded as a secondary operation.

INJECTION MOLD. A mold into which a plasticated material is introduced from an exterior heating cylinder.

INJECTION MOLDING. A molding procedure whereby heat-softened thermoplastic or thermoset material is forced from a plasticating barrel into a relatively cool mold cavity for hardening.

INJECTION PRESSURE. The pressure on the face of the injection ram and the pressure at which molding material is injected into the mold.

INSERT. An object molded or cast into a plastic article for a definite purpose.

INSERT, EYELET-TYPE. Insert having a section which protrudes from the material and is used for spinning over in assembly.

INSERT, FLOATING OF. When pressure is applied on the mold and the material softens, it flows upwards. If the insert is loose on the retaining pin, some of the material flows under the insert or into the anchorage points and carries or floats the insert off the retaining pin.

INSERT, FLOW OF MATERIAL INTO. If a threaded open-hole insert is being molded, the retaining pin does not prevent the material from flowing into the insert unless the retaining pin is threaded, which would increase the cost of molding.

INSERT, OPEN HOLE. One having a hole drilled completely through it.

INSERT, PROTRUDING. One having a part which protrudes from the molded material.

INSERT, RIVET. One having a protruding part which is riveted in assembly.

INSERT, THROUGH-TYPE. One which is exposed on both sides of the molded article.

INVENTORY. In injection molding or extrusion, the amount of plastic contained in the heating cylinder or barrel.

IRRADIATION. The subjection of a material to radiant energy for the purpose of producing a desired effect or of determining the effect of the radiant energy on the material.

ISOCYANATE PLASTICS. Plastics based on resins made by the condensation of organic isocyanates with other compounds. (URETHANE PLASTICS.)

ISOCYANATE RESINS. Most applications for this resin are based on its combination with polyols (polyesters, polyethers, etc.). During the reaction, the ingredients join through formation of the urethane linkage; hence, this technology is generally known as urethane chemistry.

ISOTACTIC. Pertaining to a type of polymeric molecular structure containing sequences of regularly spaced asymmetric atoms arranged in like configuration in the main polymerchain. Materials containing isotactic molecules may exist in high crystalline form, because of the high degree of order that may be imparted to such structure.

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