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US 4,045,531 AGranted
Process for the production of chipboards and the like
AssigneeBison-werke Bahre & Greten GmbH & Co. KG
InventorBerndt Greten
Life of this patent
Estimating the term…
Abstract
The temperature distribution through the thickness of a layer of particulate matter formed by air screening and by compressing in a press for forming a particle board therefrom is made more nearly uniform by heating the air stream or air streams used for the air screening of the particulate matter.
Claims10
In the process for the production of particle boards which comprises:
- a. intermixing particles with a heat-curable binder to cover the particles with said binder;
- b. air screening the binder-covered particles to deposit a layer of the particles onto a support;
- c. transporting the layer of particles into a first press;
- d. prepressing the layer of particles within said first press to form a prepressed layer of particles;
- e. transporting the prepressed layer of particles to a second press;
- and
- f. pressing the prepressed layer of particles in said second press and heating the layer of particles within said second press to effect curing of said binder whereby the particles are bonded together to form a particle board;
- the improvement which comprises
- heating the air used in (b) for air-screening of the particles to provide more uniform temperature distribution through the thickness of the layer of particles transported to said first and second presses, the maximum temperature of the air being limited to avoid curing of the binder prior to compression of the particles in the first and second presses.
6 more elements
In a process for forming a particle board which comprises:
- a. intermixing particles with a heat-curable binder to cover the particles with said binder;
- b. air-screening the binder-cover particles to deposit a layer of the particles onto a support;
- c. transporting the layer of particles to a heated press;
- and
- d. compressing the layer of particles in said press heated to activate said heat-curable binder whereby said particles are bonded together to form the particle board;
- the improvement which comprises
- heating the air used for air-screening the particles in (b) so that the temperature distribution throughout the thickness of the layer of particles is more nearly uniform as the layer is transported into said press;
- the maximum temperature of the air being limited to avoid curing of the binder prior to compression of the particles in the press.
5 more elements
Dependencies are inferred from the claim text.