Metering and proportioning system for a two-component liquid resin and liquid hardener adhesive
US4628861A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 12, 1985 |
| Grant date | Dec 16, 1986 |
| Priority date | — |
| Expiry date | Dec 12, 2005 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05B12/1418
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A new metering and proportioning apparatus for directly applying a two-component adhesive in a wood laminating process is described. The key element of the invention is a valve system regulating flow of resin and hardener to and from double-acting cylinder pumps. The new system eliminates conventional spool valve difficulties. Each component cylinder pump is supplied with a pair of 3-way ball valves which are manifolded to direct component flows. A pneumatic control system senses completion of a component discharge stroke and causes simultaneous reversal of the ball valve pair for discharge of component and refilling of the emptied side of the cylinder on the return stroke. A two-level optical sensor detects a workpiece and opens extruder head discharge. The sensor operates a modulating valve in the resin supply line as the workpiece proceeds ensuring even spread rate. A staged shutdown of the system occurs when the sensor detects the trailing edge of the workpiece which insures that the delivery system remains under pressure and that no overrun or post-application oozing takes place.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.