Method for producing a tubular object of polyethylene terephthalate or similar thermoplastic material from a tubular blank of amorphous material

Patent 4405546 Issued on September 20, 1983. Estimated Expiration Date:

May 18, 2001. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

2338210

3205289

3757718

Method of molding and stretching stoppers
Patent #: 4198370
Issued on: 04/15/1980
Inventor: Suzuki

Pipette and method of making same Patent #: 4212204
Issued on: 07/15/1980
Inventor: St. Amand

Inventors

Assignee

PLM AB

Application

No. 06/264665 filed on 05/18/1981

US Classes:

264/159, Tubular work264/291, Stretching or stretch forming264/296, One step reshapes portion only of article264/527, Forming multiple containers in a single mold block from a single length of parison264/532, Shaping is longitudinal or axial stretching prior to or during differential fluid pressure deformation425/393Mandrel to interiorly support work and means urging work against mandrel

Examiners

Primary: Silbaugh, Jan H.

Attorney, Agent or Firm

Hane, Roberts, Spiecens & Cohen

International Classes

B29C 31/00 (20060101)
B29C 49/48 (20060101)
B29C 55/00 (20060101)
B29C 49/54 (20060101)
B29C 55/22 (20060101)
B29C 59/04 (20060101)
B29C 55/30 (20060101)
B29C 67/00 (20060101)
B29C 49/08 (20060101)
B29C 49/14 (20060101)
B29C 49/00 (20060101)
B29C 49/22 (20060101)
B65D 1/02 (20060101)

Foreign Application Priority Data

1980-05-29 SE

Abstract

An object is produced from a tubular blank (10,15,17) of thermoplastic material of polyester or polyamide, preferably of polyethylene terephthalate by reducing the thickness of amorphous material in one or several areas of the blank by means of one or several consecutive re-shaping operations. A mechanical shaping device (23,29,71,81) moves a transitional zone (13,14,113) situated between thicker and thinner material along the blank and simultaneously elongates the blank in the moving direction of the transitional zone while reducing the thickness. After the last re-shaping operation the thinner material preferably has an oriented state. During the re-shaping operation the temperature of the material in the transitional zone (13,14,113) is controlled at a level which, immediately before the re-shaping operation, is within or close to the range of the glass transition temperature (TG). In one embodiment the reduction of the wall thickness of the material is begun in a track (12) in the wall of the blank and continues symmetrically around the track. Clamping devices (41,51,61) are used to maintain the axial position of the blank. The blank is suitable for re-shaping, for instance, into a container in which the mouth also consists of oriented material.