Method of making an extravertable-wall container

• US 4,035,461 A
• Filed: 02/11/1975
• Issued: 07/12/1977
• Est. Priority Date: 08/16/1973
• Status: Expired due to Term

• Current Assignee: Krauss Maffei AG (Siemens AG)
• Original Assignee: Krauss Maffei AG (Siemens AG)
• Inventors: Korth, Herbert
• Primary Examiner(s): Silbaugh, Jan H.
• Application Number:
  US05/549,000
• Time in Patent Office: 882 Days
• Field of Search: 264/89, 264/90, 264/92, 264/94, 264/96, 264/97, 264/98, 264/99, 264/296, 264/295, 425/DIG. 209, 425/ DIG. 214, 425/DIG. 207, 150/.5, 215/1 C, 53/29, 53/37
• US Class Current: 264/534
• CPC Class Codes: B29C 2049/023 using inherent heat of the preform, i.e. 1 step blow moulding
• CPC Class Codes: B29C 2049/4858 Exchanging mould parts, e.g. for changing the mould size or geometry for making different products in the same mould
• CPC Class Codes: B29C 2049/548 the movement of the mould parts during opening of the mould are interlinked
• CPC Class Codes: B29C 49/0031 Making articles having hollow walls
• CPC Class Codes: B29C 49/04 Extrusion blow-moulding
• CPC Class Codes: B29C 49/06 Injection blow-moulding
• CPC Class Codes: B29C 49/0665 the injection mould cavity and the blow-mould cavity being displaceable to the geometrically fixed injection core mould
• CPC Class Codes: B29C 49/4283 Deforming the finished article
• CPC Class Codes: B29C 49/48 Moulds
• CPC Class Codes: B29C 49/541 having a recessed undersurface
• CPC Class Codes: B29C 67/00 Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
• CPC Class Codes: B29C 69/025 Deforming articles in a simpler intermediate shape without internal stresses for packaging transporting or storage and reshaping and fixing the original configuration on the place of use shaping by liberation of internal stresses B29C61/00
• CPC Class Codes: B65D 1/0223 characterised by shape
• CPC Class Codes: B65D 1/0292 Foldable bottles
• CPC Class Codes: B65D 1/26 Thin-walled containers, e.g. formed by deep-drawing operations B65D1/165 takes precedence
• CPC Class Codes: B65D 1/265 Drinking cups B65D81/3865 takes precedence, holders for plastic cups A47G23/0208
• CPC Class Codes: B65D 21/0233 Nestable containers

Abstract

An extravertable-wall container is formed by extruding a parison into a blow-mold cavity having a pair of oppositely diverging halves which are joined at their widest portions, one half being slightly smaller than the other so that the frusto-conical wall of the container formed in this half can be pushed (compressed) into the other half to produce a stackable cup-shaped structure. When the container is to be filled, the inner wall portion is extraverted to form an extension of the container, e.g. the bottom. The container may have a frustoconical upwardly widening base which is geometrically smaller but inverted with respect to the larger frustoconical head. A neck or filling opening may be provided on this head.

Claims

1. A method of making a container comprising the steps of:

enclosing a blowing mandrel in a blow mold having a first half surrounding said mandrel at a location spaced from an end thereof and defining a cup-shaped cavity widening away from said location, said mold having a second half formed with a cup-shaped cavity geometrically similar to the cup-shaped cavity of said first half and widening in the direction thereof, said cup-shaped cavities adjoining to produce a molding cavity having the configuration of a container to be formed;

advancing an injection nozzle through said second half to surround said mandrel and define an elongated injection cavity therewith;

injecting a thermoplastic synthetic-resin material into said injection cavity through said nozzle to form a closed end parison around said mandrel;

withdrawing said nozzle from said molding cavity through a wall of said second half and closing said wall;

blowing said parison through said mandrel to expand said parison against the walls of said molding cavity, thereby forming a container conforming to the configuration of said molding cavity and having a first cup portion lying in the cup-shaped cavity of said first half and a second cup portion lying in the cup-shaped cavity of said second half;

separating said first and second halves of said mold to release said container from said molding cavity; and

axially displacing said first cup portion toward said nozzle and advancing said nozzle toward said mandrel to entrain the bottom of said second cup portion into said first cup portion and introvert said second cup portion within said first cup portion.

2. The method defined in claim 1, further comprising the steps of molding a neck on said parison around said mandrel during the injection of said thermoplastic synthetic-resin material into said injection cavity.

3. The method defined in claim 1, further comprising the step of introducing a liquid filling material into said container to displace outwardly the introverted second cup portion during filling of the container.