Method and apparatus for cooling hot-pressed panels, especially

Details Method and apparatus for cooling hot-pressed panels, especially Method and apparatus for cooling hot-pressed panels, especially

1998-11-13

2000-10-03

Theisen, Mary Lynn

Plastic and nonmetallic article shaping or treating: processes

Treating shaped or solid article

By a temperature change

264109, 425407, B27N 318

Patent

active

061268836

ABSTRACT:
A method of cooling hot-pressed panels, such as wood chip or fiber board panels or sheets, includes a first step in which the panels are intensively cooled from an initial temperature above 100.degree. C. down to a temperature of about 100.degree. C. by means of cooling water, a second step in which the panels are further cooled to a temperature below 60.degree. C. by using cooling air, and a third step of reconditioning the panels by exposing the panels to a vapor mixture of steam and volatile binder components that was evolved during the first step. The third reconditioning step can begin and take place already during the first cooling step, or between the first and second cooling steps. An apparatus for carrying out the method includes a hot press apparatus, a first cooling arrangement for applying cooling water to the panels, a second cooling arrangement for applying cooling air to the panels, a reconditioning zone for exposing the panels to a vapor mixture arising during the first cooling step, and a conveyor device for transporting the panels through the apparatus. In this manner, the total time required for cooling the panels is substantially reduced.

REFERENCES:
patent: 4957671 (1990-09-01), Morris
patent: 5008057 (1991-04-01), Risius et al.

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