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:
Jun. 22, 1976
Filed:
Jun. 16, 1975
Robert H Day, Bracknell, EN;
Illinois Tool Works Inc., Chicago, IL (US);
Abstract
Apparatus and method for thermoforming two or more plastics sheets simultaneously, to form in one operation a double-walled cup, or a composite walled cup, or a plurality of single-walled cups. The sheets are moved and heated simultaneously, the portion not being thermoformed being kept apart, permitting economy of scrap remelting. The thermoformed portions can be kept apart by pressure between the sheets, which can serve to hotform the sheets against respective mould surfaces, or air pressure can bond the sheets together. Existing machines need substantially only an additional clamping plate, heater, and compressed air passing through a radial port in a clamping plate, to incorporate the invention.