Process for making and using high frequency weldable material
OwnerGerhard Pohlinventor
Life of this patent
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Abstract
Discrete particles consisting of thermoplastic synthetic resin, which are adapted to melt and to produce a high frequency weld joint under the action of a high frequency field and to resist the action of detergents and dry cleaning agents are arranged on at least one boundary surface of a support structure which is permeable to gas, vapor and liquid, and which is preferably constituted by a continuous web to which the particles are preferably fixed by the application of pressure and/or heat. An additional layer, preferably also consisting of a continuous web, is then applied to the one boundary surface of the support structure and the thus-formed composite structure is subjected to the action of a high frequency field to provide a welded joint connecting the additional layer to the support structure.
Claims16
A process for producing a composite structure, particularly a rustle-free composite structure which is permeable to gas, vapor and liquid and which is resistant to the action of detergents and dry cleaning agents, comprising the steps of forming a patterned arrangement comprised of a plurality of spaced-apart depressions on an exterior surface of a support member;
- advancing sequential portions of said surface beneath a filling station;
- cooling each of said sequential surface portions as it travels beneath said filling station;
- filling said spaced-apart depressions at said filling station with at least one discrete powder particle of dipolar plastic material by permitting gravity descent of said powder particles from said filling station towards said depressions as the support member passes beneath the filling station, the cooling of each of said sequential surface portions as it travels beneath said filling station preventing the initiation of plasticization of the powder particles and thereby insuring proper entry of the latter into said depressions;
- advancing a sequential surface portion upon filling of said depressions thereof towards an applicator station;
- preheating a flexible support web so as to cause said powder particles to become tacky over the area of their surfaces facing outwardly and towards said flexible support web;
- and contacting the respective sequential surface portion at said applicator station with at least one boundary surface of said flexible support web which is permeable to gas, vapor and liquid, and transferring said tacky particles from said depressions onto said one boundary surface so as to form and bond said patterned arrangement thereon.
Dependencies are inferred from the claim text.