Process for production of a wall for a package

Details Process for production of a wall for a package Process for production of a wall for a package

1990-01-16

1993-08-24

Michl, Paul R.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

25218828, 264512, C08K 500, C08K 509, B32B 2716, B65D 8126

Patent

active

052390160

ABSTRACT:
A process for the production of a wall for a package including producing a preform of the wall and stretching the preform of the wall where the preform includes a layer containing a polymer and having oxygen-scavenging properties. The preform and the stretching ratios applied are chosen (i) so that the time (t.sub.I) which the permeance of the wall for oxygen would take to rise to 1/5 of the value it would have in the absence of oxygen scavenging would be at least 10 days and (ii) if the preform were stretched at that time (t.sub.I) after the preform were produced, the time (t.sub.D) which the permeance of the wall for oxygen would take to rise 1/5 of the value it would have in the absence of scavenging would be at least 1/4 of the time (t.sub.I). The time between completion of step (A) and the commencement of step (B) is at least 10 days.

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H. F. Mark, "Encyclopedia of Polymer Science and Engineering", vol. 2, 1985, pp. 84-85 (Page 85, para. 3).

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