US 4,074,961 AGranted

Apparatus for producing containers

AssigneeAltstadter Verpackungs-Vertriebs GmbH

InventorWilhelm Reil

Life of this patent

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Abstract

A container for storing liquids is injection molded of thermoplastic material in apparatus which includes a plurality of central die members intermittently movable in succession along a given direction and a pair of side die members flanking said central die members and movable into and out of operative engagement therewith. The container is injection molded within a die cavity formed between the central die members and the side die members with two sheets of a base material being fed from opposite sides of said central die members into said die cavity to form a base member for said container. The container base member formed from said sheets of base material is engaged about the central die members and when the side die members are brought into operative engagement with the central die members thermoplastic material is injected into the die cavity formed therebetween and the container is produced by injection molding the thermoplastic material integrally with the base member within the die cavity. The die cavity is configured to form the container with an open bottom end having a bottom closure member partially connected thereto to enable bottom filling of the container and subsequent sealing of the bottom end by pivoting of the bottom closure member into sealing engagement with the bottom end of the container. After the injection molding process is completed, the side die members are separated from the central die members and the formed container is ejected from the central die member about which it is formed. During the injection molding process the sheets of base material are joined together by a seal formed between the edges thereof in order to enable the sheets to be pulled along with the central die members as they move through the apparatus in the performance of the injection molding process.

Apparatus for injection molding containers from thermoplastic material comprising central die means including a plurality of individual central die members and motive means moving said central die members intermittently one behind the other along a given path, side die means including a pair of side die members flanking said central die means and including means moving said side die members transversely to said given path of said central die members into and out of operative engagement with said central die means, said central die means and said side die means being configured to form therebetween when in operative engagement with each other a die cavity within which thermoplastic material may be injected to form said containers, means for supplying into said die cavity a base material about which thermoplastic material may be injection molded to form said containers, said base material supply means being operative to supply said base material in the form of two separate sheets from opposite sides of said central die means, means operable to inject into said die cavity a thermoplastic material, said motive means operating to move said central die members in succession from one side of said side die members to between said side die members and to the opposite side of said side die members, said central and side die means forming a die cavity configured to receive injected thermoplastic material to form a seal between said separate sheets of base material at a point rearwardly of a given central die member when said given central die member is in engagement between said side die members, the next succeeding central die member being positioned to engage said sheets of base material to pull said sheets from said supply means thereof as said next succeeding central die member moves to between said side die members, and means operable to inject formed containers from about said central die means when said side die means are out of operative engagement with said central die means.

Facts

Application

05/675,275Filed 9 Apr 1976 · continuation in part

Priority

DT 22100132 Mar 1972

Granted

21 Feb 1978

Term ends

Not estimatedThe source records don’t support an estimate.

Classification23 codes

B65D 47/063
With telescopic, retractable or reversible spouts, tubes or nozzles: with flexible parts
B29C 45/04
Injection moulding apparatus: using movable moulds or mould halves
B29C 45/14
Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor: incorporating…
B29C 45/14467
Incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles: joining articles or parts of a single article

Family

Serial333,723Parent of this continuation · filed 20 Feb 1973

Serial575,170Parent of this continuation-in-part · filed 7 May 1975

Serial602,223Parent of this continuation-in-part · filed 6 Aug 1975

Serial499,155Parent of this continuation · filed 21 Aug 1975

US 4,074,961 AThis patent

From the US filing history. Foreign family members aren’t listed.

Abstract

Claims16