METHOD FOR PRODUCING A HOLLOW DOUBLEWALL PLASTIC ARTICLE

• US 3,636,151 A
• Filed: 04/27/1970
• Issued: 01/18/1972
• Est. Priority Date: 04/27/1970
• Status: Expired due to Term

• Current Assignee: Nagai Tomomasu
• Original Assignee: Nagai Tomomasu
• Inventors: NAGAI TOMOMASU
• Application Number:
  US05/032,109
• Time in Patent Office: 631 Days
• US Class Current: 264/526
• CPC Class Codes: B29C 2791/001 Shaping in several steps
• CPC Class Codes: B29C 49/00 Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
• CPC Class Codes: B29C 49/0031 Making articles having hollow walls
• CPC Class Codes: B29C 49/04 Extrusion blow-moulding
• CPC Class Codes: B29C 49/56 Opening, closing or clamping means
• CPC Class Codes: B29C 65/028 making use of inherent heat, i.e. the heat for the joining comes from the moulding process of one of the parts to be joined
• CPC Class Codes: B29C 66/1142 Single butt to butt joints
• CPC Class Codes: B29C 66/1312 Single flange to flange joints, the parts to be joined being rigid the parts to be joined being flexible B29C66/133
• CPC Class Codes: B29C 66/14 the joint having the same thickness as the thickness of the parts to be joined B29C66/1142 takes precedence
• CPC Class Codes: B29C 66/54 Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
• CPC Class Codes: B29C 66/71 characterised by the composition of the plastics material of the parts to be joined welding bar compositions B29C65/125
• CPC Class Codes: B29C 66/73921 characterised by the materials of both parts being thermoplastics
• CPC Class Codes: B29C 66/8222 Pinion or rack mechanisms
• CPC Class Codes: B29C 66/8242 Pneumatic or hydraulic drives using fluid pressure directly acting on the parts to be joined B29C66/8266
• CPC Class Codes: B29C 66/83221 cooperating reciprocating tools, each tool reciprocating along one axis
• CPC Class Codes: B29K 2023/04 Polymers of ethylene
• CPC Class Codes: B29K 2023/06 PE, i.e. polyethylene
• CPC Class Codes: B29K 2023/10 Polymers of propylene
• CPC Class Codes: B29K 2023/12 PP, i.e. polypropylene
• CPC Class Codes: B29K 2025/04 Polymers of styrene
• CPC Class Codes: B29K 2025/06 : PS, i.e. polystyrene
• CPC Class Codes: B29K 2027/06 : PVC, i.e. polyvinylchloride
• CPC Class Codes: B29K 2055/02 : ABS polymers, i.e. acrylonitrile-butadiene-styrene polymers
• CPC Class Codes: B29K 2075/00 : Use of PU, i.e. polyureas or polyurethanes or derivatives thereof, as moulding material
• CPC Class Codes: B29K 2105/04 : cellular or porous
• CPC Class Codes: B29L 2024/00 : Articles with hollow walls
• CPC Class Codes: B29L 2031/5227 : Clubs
• CPC Class Codes: B29L 2031/7178 : Pallets
• CPC Class Codes: B65D 1/265 : Drinking cups B65D81/3865 takes precedence, holders for plastic cups A47G23/0208
• CPC Class Codes: B65D 11/00 : Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of plastics material specially constructed to be opened by cutting, piercing, or tearing of wall portions B65D17/00; pallets B65D19/00
• CPC Class Codes: B65D 11/16 : with double walls
• CPC Class Codes: B65D 19/0012 : forming a continuous plane contact surface
• CPC Class Codes: B65D 2519/00034 : Plastic
• CPC Class Codes: B65D 2519/00069 : Plastic
• CPC Class Codes: B65D 2519/00273 : made of more than one piece
• CPC Class Codes: B65D 2519/00278 : the load supporting surface and the base surface being identical
• CPC Class Codes: B65D 2519/00288 : made of one piece
• CPC Class Codes: B65D 2519/00318 : made of one piece
• CPC Class Codes: B65D 2519/00343 : contact surface being substantially in the form of a panel
• CPC Class Codes: B65D 2519/00557 : without separate auxiliary elements
• CPC Class Codes: B65D 2519/00562 : chemical connection, e.g. glued, welded, sealed
• CPC Class Codes: B65D 81/3818 : formed with double walls, i.e. hollow
• CPC Class Codes: B65D 81/3823 : formed of different materials, e.g. laminated or foam filling between walls
• CPC Class Codes: B65D 81/3869 : formed with double walls, i.e. hollow

Abstract

A method for forming a hollow double-wall plastic article comprises positioning at least two tubular plasticized parisons of plastic material at opposite sides of at lease one core of a mold, closing half-molds of the mold about the parisons and the core to enclose said parisons, blowing the parisons into contact with the cavity faces by introducing fluid pressure medium into the parisons and removing the finished article from the mold after curing the article. Further, an apparatus for the said method comprises a pair of extrusion nozzles positioned parallel to each other, a mold including a pair of half-molds and means for introducing fluid pressure medium into the enclosed parisons.

Claims