Expansion-molded article of polyolefin resin having open voids
US5622756A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 12, 1995 |
| Grant date | Apr 22, 1997 |
| Priority date | — |
| Expiry date | May 12, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/249981
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An expansion-molded article of a polyolefin resin, which is high in fusion-bonding strength and excellent in water permeability and compressive strength and has open voids, and a production process thereof are disclosed. The expansion-molded article is made of tubular foamed particles with a through-hole, whose d.sub.MIN is at least 1.5 mm and whose d.sub.MIN /D.sub.MIN value is 0.25-0.85 wherein d.sub.MIN is a minimum diameter of the hole in sections perpendicular to the direction of the hole and D.sub.MIN is a minimum outer diameter of the foamed particle in a section that d.sub.MIN has been provided. The production process includes filling the tubular foamed particles with a through-hole, whose d.sub.MIN and d.sub.MIN /D.sub.MIN are at least 1.5 mm and 0.25-0.85, respectively, into a mold and then molding the foamed particles under heat, whereby the foamed particles are fusion-bonded to one another.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.