Abstract A parison, after proper temperature conditioning is stretched by being grasped at both ends and moving the ends of the parison apart relative to one another. The bottom end of the parison is closed and the top end is grasped in a molding device. A small amount of air is introduced into the parison to partially inflate it. One clamping unit is moved at an angle from about 15* up to 90* relative to the other in one plane. The stretched parison is then in proper position between the mold halves which subsequently close. Full air pressure is then admitted to finish the forming of a biaxially oriented container having an opening at an angle from 15* to 90* with the principal axis of the container.
The process of claim 1 wherein the steps of stretching said parison and guiding said parison to cause the ends of said parison to be moved from 15* to 90* relative to each other in one plane are conducted simultaneously.
Claim 2
Dependent Claim
33 words
A process according to claim 1 wherein said parison is heated to a temperature in the range of about 320* to 340* F. to form a pretreated parison and said parison comprises polypropylene.
Claim 3
Dependent Claim
28 words
The method of claim 1 wherein a pressure within the range of about 1 to 15 lbs. p.s.i. is introduced into said parison to partially inflate said parison.
Claim 4
Dependent Claim
21 words
The method of claim 1 wherein said ends of said parison are moved 90* relative to each other in one plane.
Claim 5
Dependent Claim
31 words
The method of claim 1 wherein air is introduced into the inner portion of said parison thereby causing the parison to expand by internal fluid pressure to fill the mold cavity.
Claim 6
Dependent Claim
20 words
A method according to claim 1 wherein said stretching of (d) and partial inflation of (e) are carried out simultaneously.