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:
May. 22, 1979
Filed:
May. 02, 1977
Dietmar Aichinger, Arlesheim, CH;
Albert Obrist AG, Reinach, CH;
Abstract
A method for molding a plastic closure cap unit for a container, which cap unit comprises an internally threaded upper closure cap and a downwardly extending skirt forming a sealing ring connected thereto through an intermediate shear zone of reduced thickness, the sealing ring increasing in thickness downwardly from the shear zone and being devoid of abrupt changes in contour such as would preclude axial removal of the cap and sealing ring from a non-expanding mold surrounding the sealing ring, comprises injecting molten plastic into a mold shaped to form the cap unit and including fixed and movable sections forming mold surfaces, disengaging the mold from the outer surface of the upper closure cap by axial movement of the related mold section relative to the remaining sections, then disengaging the mold from the inner surfaces of the closure cap and sealing ring by axial movement of the related mold section relative to the remaining section of the mold still surrounding the outer wall of the sealing ring up to the lower rim of the upper closure cap, and then disengaging the mold from the cap unit by axial movement of the cap unit relative to the remaining section of the mold surrounding the sealing ring. The mold itself comprises first and second female mold sections engageable to form the outer surfaces respectively of the upper closure cap and the sealing ring, and a male mold section cooperating with the female mold sections to form the inner surface of the closure cap unit. Mold operating means effect the axial movements to effect removal of the cap unit from the mold.