Pre-conditioning of a medium web during the fabrication of corrugated paperboard
US6089296A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 1, 1998 |
| Grant date | Jul 18, 2000 |
| Priority date | — |
| Expiry date | Jun 1, 2018 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB31F1/2845
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An apparatus for preconditioning a medium web on a corragator before fluting the medium web during the manufacturing process of corrugated paperboard uses steam flows and pressures to press the medium web against a hot plate assembly. A plurality of elongated steam showers are located within a steam chamber secured to the preconditioning apparatus. The steam chamber wall structure includes a sealed web inlet and sealed web outlet for the medium web. The velocity and pressure (e.g., average steam pressure within steam chamber approximately 0.1 to 0.3 psi) of steam injected into the steam chamber holds the medium web against hot plates to promote heat transfer from the hot plates to the medium web. In addition, the medium web is heated directly by the latent heat of steam condensation, and also moistened directly by the condensation of the steam. A vacuum may or may not be used to increase the pressure of the medium web against the hot plates.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.