Process for producing fused cellulose products

Details Process for producing fused cellulose products Process for producing fused cellulose products

1976-05-19

1978-09-05

White, Robert F.

Paper making and fiber liberation

Processes and products

264 25, 264 85, 264120, 264123, 264126, 162181R, H05B 100

Patent

active

041117441

ABSTRACT:
Cellulose-containing materials such as wood fiber or vegetable fibers are permanently fused in a fast-acting process by subjecting the fibers to conditions producing a new state of fusion and chemical combining under intensive heating while excluding oxygen, and requiring little or no primary binder additives. This fused cellulose is reached by introducing cellulose materials having equilibrium moisture content from 2% to 50% (preferably 3% to 12%) into an oxygen-excluding reaction station having temperature in the range from 450.degree. F to 800.degree. F and wherein dielectric energy is applied in conjunction with high ambient temperature. The temperature is well beyond the normal cellulose carbonizing temperature and cellulose combustibility at temperatures of about 400.degree. F. Specific exposure of the materials to elevated temperature is accurately controlled to minimize possible carbonizing. As quickly as possible, the fused material is transferred to an oxygen-excluding hot stacking station where a continuation of the initial fusion reaction is carried out. Thin perforated metal sheets with associated back-up members allow internally generated steam and gases to escape from each cellulose-containing mat and expel entrained air. Novel fused cellulosic products including boards, panels and paper are enabled to be produced, including products having exterior grade weathering strength in spite of the fact that no primary binder additives are used in their formation. Commercially smooth two sides board products are produced without the need for wasteful and expensive machine sanding operations.

REFERENCES:
patent: 2581652 (1952-01-01), Goss
patent: 3444275 (1969-05-01), Willett

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