Process of making laminated structural member
AssigneeCapital Wire and Cable, Division of U.S. Industries
InventorJohn Philip Pringle
Life of this patent
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Abstract
A process for making a laminated structural member is disclosed in which the member is fabricated with one layer of sheet material such as plywood or fiberboard and an adjacent layer bonded thereto and formed from a mixture of scrap particles of thermoplastic wire and cable insulation, wood particles, comminuted paper, sawdust, and a suitable resin binder. The fabrication process is carried out by initially forming a mixture of reclaimed thermoplastic wire or cable insulation, a thermosetting binder, a wood-like filler, and a mold release agent. The mixture is then placed in a mold with the sheet material and subjected to heat and pressure to form a laminated structural member.
Claims7
A process for forming a flexible laminated structural member comprising:
- a. admixing from about 30 to about 60 weight percent of particulate thermoplastic material wherein at least 50 percent of the particles have a particle dimension of from about 1/16 inch to about 1/4 inch with from aout 70 to about 40 weight percent of a particulate wood filler material to form a first mixture;
- b. admixing from about 11 to about 18 weight percent of a thermosetting binder, based upon the weight of the first mixture, to the first mixture to form a resultant mixture;
- c. placing a sheet material having at least one surface into a mold;
- d. placing an effective amount of the resultant mixture into the mold adjacent to at least one of the surfaces of the sheet material to cover the surface to a desired depth;
- and
- e. heating and compressing the resultant mixture and the sheet material at a temperature in the range from about 250.degree. F. to about 450.degree. F. and at a pressure from about 75 psi to about 350 psi for a period of time effective to enable the particulate thermoplastic material to form flexible discrete zones whereby the discrete zones bond together and said resulant mixture bonds to said sheet material to form a flexible laminated structural member.
Dependencies are inferred from the claim text.