Process for producing foamed material from waste paper and the like
AssigneeSchweitzer, Vodermair & Schimmer-Wottrich GBR
InventorsNorbert Habelski, Edgar Brandauer
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Abstract
A process for the production of foamed material from waste paper and the like, such as paper, cardboard, waste cardboard or materials with similar properties, are usable in the same way as raw material, either sorted by type of material or as a raw material mixture. First, a liquid-containing pulp is prepared from the raw materials. The foaming and hardening of this pulp takes place under the action of microwave radiation. By using suitable molds permitting an unobstructed access of the radiation to the liquid-containing mass and unhindered expulsion of the resulting vapor, it is possible to manufacture any type of shaped bodies in a continuous or batch-wise process.
Claims11
Process for producing foamed and solidified material from recycled paper comprising:
- preparing a starting mixture by mixing paper with a liquid, comprising water devoid of adhesive;
- optionally providing said starting mixture with additives devoid of adhesive for obtaining desired properties in a final product;
- said starting mixture minimally containing as much water as is required for causing foaming and solidifying due to microwave radiation;
- said starting mixture maximally containing only as much water as cellulose containing fibers of the materials used are capable of absorbing;
- applying microwave radiation to said starting mixture causing foaming of said starting mixture and carrying out the foaming and simultaneously the solidifying and the shaping of the starting mixture after the water has been completely removed;
- and
- subjecting the foamed material to at least one after-treatment step selected from the group consisting of after-hardening, residual drying, surface treatment, and finishing to produce the final product of increased volume.
Dependencies are inferred from the claim text.