Seamless can and a method of producing the same
US5700529A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 2, 1995 |
| Grant date | Dec 23, 1997 |
| Priority date | — |
| Expiry date | Feb 2, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31681
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A seamless can obtained by forming a laminated material of a metal and a polyester film into a cup such that a final draw ratio defined by H/D (H:height, D:diameter of the bottom portion) is not smaller than 1.5, wherein a polyester (A) on the bottom portion of the container has a biaxial orientation degree (R.sub.X) of from 2.5 to 20 defined by the following formula (1), EQU R.sub.X =I.sub.A /I.sub.B (1) and a polyester on the barrel portion of the container has a monoaxial orientation satisfying the following formula (2), EQU 0.55<cos.sup.2 .phi.<1-exp -0.45I.sub.A /I.sub.B -1.1.epsilon.+0.53!(2) PA1 wherein R.sub.x, I.sub.a, I.sub.b and cos.sup.2 .phi. are as defined in the specification, and a method of producing the same.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.