Adhesive bonding and miscellaneous chemical manufacture – Surface bonding means and/or assembly means therefor – With stretching or tensioning means
Patent
1983-05-16
1984-12-18
Bell, James J.
Adhesive bonding and miscellaneous chemical manufacture
Surface bonding means and/or assembly means therefor
With stretching or tensioning means
156160, 156296, 156324, 156499, 156555, 1565835, B32B 3100
Patent
active
044889283
ABSTRACT:
Improved method and apparatus for forming soft, bulky absorbent webs including thermoplastic fibers. The web is bonded under conditions that heat the thermoplastic fibers to produce web bonding while avoiding direct contact with the heat source. The apparatus includes a pair of foraminous belts or wires between which the web or webs to be bonded are enclosed. The construction of the foraminous wires and belts is selected to produce the desired degree of bonding and yet maintain separation between the subsequently applied heat source and the web or webs. The combination of the web and belts or wires is then directed under tension to a heat source which may be, for example, a series of heated cans, and the opposite sides of the combination are alternately contacted by the surfaces. After heating, the web is allowed to cool and retains its bonded configuration determined by the structure of the wires or belts and the content of the web. Examples of webs which may be so bonded include pulp fluff having mixed therein thermoplastic bonding fibers such as polypropylene/polyethylene biconstituents, for example, Chisso ES. The construction of the belt or wires preferably is such that at least about 20% open area is provided upon contact with the web for sufficient strength properties to be obtained. In alternative embodiments, multiple webs of the same or different compositions may be fed between the wires or belts and laminates produced. Webs of the invention retain highly desirable absorbency properties since the open structure is maintained to a high degree by avoiding direct contact with the heat source that would otherwise produce excessive fusing and overbonding of the webs.
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Ali Khan Mir I.
Schmidt Richard J.
Bell James J.
Herrick William D.
Kimberly-Clark Corporation
Olevaky Howard
Peters R. Jonathan
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