Process for bonding cellulosic nonwovens with thermoplastic fibe

Details Process for bonding cellulosic nonwovens with thermoplastic fibe Process for bonding cellulosic nonwovens with thermoplastic fibe

1987-12-28

1990-06-19

Cashion, Jr., Merrell C.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

34 4, 34 16, 34 23, 34 26, 34 34, 34 41, 1562722, 156285, 156296, 1563082, B32B 3120, B32B 3126

Patent

active

049350773

ABSTRACT:
A method and apparatus are disclosed for binding a nonwoven material by means of a binding agent requiring heat for activation, particularly for binding cellulosic fibers with a thermoplastic material. The material is irradiated with an infrared radiation source, and surface burning of the irradiated material is prevented by passing a weak flow of air through the material. Inclined walls guide the air flow through the material in an inclined path directed from the edge of the infrared radiation source and towards the center thereof. Each infrared radiation source is surrounded by two side walls so that a space is formed between each side wall and the radiation source for the passage of the inlet air. The cross-sectional areas of these spaces are together approximately equal to the cross-sectional area of a suction channel positioned opposite the spaces. The air flow is controlled by means of two speed-regulated fans, one at the inlet and one at the outlet of the apparatus.

REFERENCES:
patent: 3340617 (1967-09-01), Carroll, Jr.
patent: 3357878 (1967-12-01), Newman
patent: 3619322 (1971-11-01), Fleissner
patent: 3861057 (1975-01-01), Wittstock
patent: 3864546 (1975-02-01), Cahnman
patent: 3908250 (1975-09-01), Agan
patent: 4105484 (1978-08-01), Newton et al.
patent: 4169007 (1979-09-01), Pray
patent: 4324752 (1982-04-01), Newton et al.
"Vliesstoffe", Joachim Lunenschloss and Wilhelm Albrecht, Georg Thieme Verlag Stuttgart, New York, 1982, pp. 218-219.

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