Method of producing a hollow shaped body
AssigneeSchade KG
InventorsHarald Strunk, Kurt Gohr
Life of this patent
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Abstract
A hollow injected shaped body of synthetic plastic is produced by injecting a predetermined quantity of a synthetic plastic melt into a multi-part mold, and forming the melt to the shaped body by a gas under pressure. After bringing the synthetic plastic melt into the mold cavity, the gas is injected into the synthetic plastic melt, then after overcoming the shaped body wall it flows into an overflow chamber from it into a gas circulation system so that during the forming of the melt a hollow formed in the shaped body is continuously supplied with the gas until rigidification of the shaped body.
Claims9
A method of producing a hollow injected shaped body of synthetic plastic material, comprising the steps of injecting a predetermined quantity of a synthetic plastic melt into a hollow space of a multi-part closed mold;
- forming the melt to a shaped body with a hollow by a gas under pressure, said forming including injecting the gas into the mold after bringing the synthetic plastic melt into the hollow space of the mold, overcoming a wall of the shaped body by the gas, then flowing the gas into an overflow chamber, then flowing the gas from the overflow chamber into a gas circulating system, and then again flowing the gas from the gas circulating system into the mold so that during the forming of the melt to a shaped body the gas continuously flows through said hollow of the same shaped body until rigidification of the shaped body.
A method of producing a hollow injection shaped body of synthetic plastic material, comprising the steps of injecting a predetermined quantity of a synthetic plastic melt into a hollow space of a mold;
- and forming the melt to a shaped body with a hollow by a gas under pressure, said forming including injecting the gas into the mold after bringing the synthetic plastic melt in to the hollow space of the mold, overcoming a wall of the shaped body by the gas, then flowing the gas after overcoming the wall of the shaped body into a gas circulating system and then again flowing the gas from the gas circulating system back into the mold, so that during the forming of the melt to a shaped body the gas continuously flows through said hollow of the same shaped body until rigidification of the shaped body.
Dependencies are inferred from the claim text.