The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 23, 2003
Filed:
May. 08, 2002
Mikael Orsén, Åkersberga, SE;
AGA Aktiebolag, Lidingo, SE;
Abstract
The present invention relates to the fabrication of a moulded detail in a gas assisted moulding process, wherein molten polymer ( ) is injected into the mould cavity ( ) of a moulding tool, pressurized fluid ( ) is supplied to the mould cavity through at least a first opening ( ) to form a cavity ( ) in the polymer and force the polymer towards the inner walls of the mould cavity, pressurized fluid ( ) is thereafter supplied to the mould cavity through at least a second opening ( ) localized remotely front said first opening to form a passage ( ) through the polymer to said cavity, the polymer is cooled, pressurized fluid is removed and the mould cavity is opened to remove the moulded detail. The invention comprises that substantially equal amounts of pressurized fluid are supplied to the mould cavity through at least one of said openings ( ) and are simultaneously removed from the mould cavity through at least an other of said openings ( ), while the polymer being cooled, the pressure being held substantially constant in said mould cavity and the supplied amount having a lower temperature than the removed amount, such that heat (Q) is conveyed from the mould cavity via the arisen fluid flow and the cooling is speeded up.