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:
Aug. 14, 1990
Filed:
May. 22, 1989
Applicant:
Inventor:
Klas A Rosen, Helsingborg, SE;
Assignee:
Tetra Pak Holdings & Finance S.A., Pully, CH;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B65D / ; C08J / ; C08K / ; B29C / ;
U.S. Cl.
CPC ...
428332 ; 220339 ; 220D / ; 220D / ; 26432818 ; 523216 ; 523220 ; 524427 ; 524449 ; 524451 ; 524494 ; 524496 ; 524585 ;
Abstract
The prerequisites for the injection moulding from thermoplastic material of container lids with a tear-up opening arrangement which is to function well on opening as well as on reclosing are improved through the use of a modified thermoplastic containing inert filler in a quantity of 10-15% of the weight of the mixture. Such a modified thermoplastic is manufactured by heating a thermoplastic, known in itself, e.g. polyethylene, to melting temperature with simultaneous admixture of the filler. The mixture is mechanically processed for a good distribution of the filler in the melted plastic mass which thereafter is cooled to form the modified thermoplastics.