Temperature control blow molding equipment in injection stretch blow molding machine

• US 4,726,756 A
• Filed: 05/21/1985
• Issued: 02/23/1988
• Est. Priority Date: 05/22/1984
• Status: Expired due to Term

• Current Assignee: Shigeta Aoki
• Original Assignee: Katashi Aoki
• Inventors: Aoki, Katashi
• Primary Examiner(s): Woo, Jay H.
• Assistant Examiner(s): Heitbrink, Timothy W.
• Application Number:
  US06/736,445
• Time in Patent Office: 1,008 Days
• Field of Search: 425/526, 425/529, 425/530, 425/534, 425/538, 425/539, 425/540, 425/546, 425/589, 425/595, 264/530
• US Class Current: 425/526
• CPC Class Codes: B29C 2049/023 using inherent heat of the preform, i.e. 1 step blow moulding
• CPC Class Codes: B29C 2049/543 at the neck portion
• CPC Class Codes: B29C 2949/0715 the preform having one end closed
• CPC Class Codes: B29C 49/06 Injection blow-moulding
• CPC Class Codes: B29C 49/062 following an arcuate path, e.g. rotary or oscillating-type
• CPC Class Codes: B29C 49/12 Stretching rods
• CPC Class Codes: B29C 49/18 using several blowing steps B29C49/16 takes precedence
• CPC Class Codes: B29C 49/6472 in several stages

Abstract

A temperature control blow molding equipment which has a temperature control mold and a blow mold on one seat body and which is used in an injection stretch blow molding machine comprising a disk-like moving plate intermittently rotatably disposed above a base disk, a plurality of neck molds provided at regular intervals under the carrying plate, and operation zones disposed at stop positions of the neck molds, the operation zones being necessary for a series of treatments from an injection molding of a parison to a removal of a molded article.

Claims

1. An injection molding apparatus, comprising:

a rotating upper disk for rotatably carrying a plurality of neck molds for holding parisons;

a stationary lower disk positioned beneath the upper disk having a series of spaced apart operation zones disposed thereon at locations where the parisons rotate with the upper disk to enter each of the operation zones, the operation zones comprising;

a first operation zone having injection means for creating the parison;

a second operation zone having removal means for removing the finished article; and

a third operation zone, disposed between the first and second operation zones including

guide members affixed to the lower disk;

a seat body slidably received on the lower disk within the guide members to move in reciprocating fashion in the direction tangential to the rotation of the upper disk;

first and second generally parallel locking plate means positioned on the seat body generally transverse to the direction of travel of the seat body;

locking means for opening and closing the locking plates;

a composite mold positioned between the locking plates and having a temperature control mold portion and a blow mold portion, the two portions being side by side generally along the travel of the seat body; and

translation means for moving the seat body and the composite mold positioned thereon such that the temperature control mold portion and the blow mold portion successively receive the parison positioned at the third operation zone.

2. An injection molding apparatus as set forth in claim 1, wherein the locking means includes a fluid operator having a cylinder and a piston, where the piston is affixed to the first locking plate and a plurality of rods affix the cylinder to the periphery of the second plate, the first plate being positioned between the cylinder and the second plate.

3. An injection molding apparatus as set forth in claim 1, wherein the translation means includes a fluid operator having a cylinder and a fluid-operated piston having a free end, where the cylinder is affixed to the lower disk and the free end of the piston is affixed to the seat body for moving the seat body and in turn first positioning the temperature control mold portion around the parison and then positioning the blow mold portion around the parison.

4. An injection molding apparatus as set forth in claim 1, wherein the translation means includes a motor-operated crank arm having a drive end and a free end, where the motor is affixed to the lower disk and the drive end of the crank arm is connected to the motor and the free end is connected to the seat body for moving the seat body and in turn first positioning the temperature control mold portion around the parison and then positioning the blow mold portion around the parison.

5. An injection molding apparatus as set forth in claim 4, wherein the composite mold has two sections which close upon each other, each section having one half each of the temperature control mold portion and blow mold portion, respectively, and locking plates for clamping the two sections together.

6. An injection molding apparatus having three operation zones for molding an article from a parison, coprising:

injection means at one zone for creating the parison;

a composite mold at another zone having a temperature control portion for heating the parison, a blow mold portion for blow molding the parison into a finished article, and translation means for moving the composite mold such that the parison is first received by the temperature control portion and the parison is then received by the blow mold portion;

removal means at a further zone for removing the finished article; and

rotary carrying means for carrying and moving the parison between the zones, from the injection means to the composite mold and to the removal means.