US PATENT SUBCLASS 162 / 123
.~ Multi-layer waterlaid webs or sheets

Current as of: June, 1999
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162 /   HD   PAPER MAKING AND FIBER LIBERATION

100  DF  PROCESSES AND PRODUCTS {31}
123.~ Multi-layer waterlaid webs or sheets {3}
124  DF  .~.~> With non-fiber added between layers
125  DF  .~.~> Layers of different properties {4}
132  DF  .~.~> Separately formed webs subsequently united {1}

DEFINITION

Classification: 162/123

(under subclass 100) Processes in which a plurality of formed fibrous webs or sheets are united prior to the final drying of at least one of the webs or sheets and the products thereof.

(1) Note. The uniting may be during the formation of one or more of the fibrous layers or may be accomplished by the folding or lapping of an undried fibrous layer upon itself. For example, the layers must be separately formed, or formed at different times or places, a single source of pulp may supply a plurality of forming means.

SEE OR SEARCH THIS CLASS, SUBCLASS:

118+, for processes in which plural layers are formed by a winding operation. Layered products, not otherwise provided for are found in this or indented subclasses (123+).

188, for processes of producing from a unitary source of pulp suspension or from a plurality of contiguous sources of pulp suspension, a single-ply web or sheet, characterized by a gradual transition or other nonuniformity, in the nature of the fiber, in progressing from one surface of the product to the other.

196, for processes involving a step of folding, twisting or rolling, where the product is not a multilayered web or sheet. Subclass 196 takes processes of producing pulp rovings by rolling a narrow strip of a waterlaid strip upon itself.

203, for processes of producing a homogeneous single-ply web or sheet by means of two forming members, in which two webs, felted on the respective forming means, are in contact with a common pulp bath at the time the webs are joined.

298, for apparatus for applying a plurality of separate streams of fibrous pulp to the same mold surface.

SEE OR SEARCH CLASS

138, Pipes and Tubular Conduits,

150, and 156+ for pipes produced by winding a web, in a plurality of turns, to desired thickness.

156, Adhesive Bonding and Miscellaneous Chemical Manufacture, appropriate subclasses, for processes of adhesively uniting preformed layers of material.

428, Stock Material or Miscellaneous Articles, appropriate subclasses, for a stock material product in the form of a single or plural layer web or sheet not provided for in any other class.