Plastic mold structure and method of making
US5124192A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 15, 1989 |
| Grant date | Jun 23, 1992 |
| Priority date | — |
| Expiry date | Nov 15, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24967
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A metal mold core which is partially insulated includes a metal continuous hard skin layer over the core and over the insulation to avoid discontinuity caused delamination in the presence of flowing injected plastic. The skin layer includes abrasion resistant nickel deposited over electroytically and electrolessly deposited copper applied over an interface metal layer on the core. The insulation layer includes multiple layers of a polyimide resin one of which layers includes glass micro spheres for decreasing the thermal conductivity to increase its insulation property and for decreasing the coefficient of thermal expansion (CTE) of the insulation to more closely match the core CTE to further preclude delamination in the presence of temperature excursions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.