Method of making building panels and the like
First Claim
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1. A method of forming a nail slot in a molded hardboard building panel having an outer face and a back face, comprising the steps of:
- molding a depression in said outer face during the initial consolidation of a relatively thick mat of wood fibres into a relatively thin sheet of molded hardboard material forming said panel and resulting in a mold-formed projection opposite said depression protruding outwardly on said back face;
curing said molded hardboard material into relatively rigid form after said initial formation; and
removing said projection from said back face to form an opening between said faces comprising said nail slot.
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Abstract
A new and improved method of making an opening extending between opposite faces of thin sheet material comprises the steps of forming a depression in one of the faces of the sheet material resulting in a projection opposite the depression on the opposite face protruding outwardly thereof and removing the projection to form an opening extending completely through the sheet material between said opposite faces.
40 Citations
14 Claims
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1. A method of forming a nail slot in a molded hardboard building panel having an outer face and a back face, comprising the steps of:
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molding a depression in said outer face during the initial consolidation of a relatively thick mat of wood fibres into a relatively thin sheet of molded hardboard material forming said panel and resulting in a mold-formed projection opposite said depression protruding outwardly on said back face; curing said molded hardboard material into relatively rigid form after said initial formation; and removing said projection from said back face to form an opening between said faces comprising said nail slot. - View Dependent Claims (2, 3, 4, 5)
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6. A method of making an opening extending between opposite faces of thin sheet material, comprising the steps of:
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initially mold-forming a relatively thick mat of wood fibrous material into a relatively thin, hardboard panel providing at least one depression in one of said faces having a depth greater than the nominal thickness of said sheet material between said opposite faces, said molded depression resulting in a projection being formed on said other face opposite said depression and protruding outwardly from said other face; solidifying said molded hardboard panel and said projection into a rigid form; and mechanically removing said rigid form projection from said other face to form said opening extending completely through said sheet material between said opposite faces thereof. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A method of making a wood fibre object having one or more slots therein comprising the steps of:
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initially mold forming by heat and pressure a first surface of said object from a mat of unconsolidated wood fibres to provide one or more depressions therein extending toward a second opposite surface being simultaneously mold formed on said object resulting in a projection on said second surface opposite each depression and extending outwardly of a surrounding portion of said second surface; solidifying said wood fibres into a consolidated sheet whereby said projection(s) becomes rigid in shape; and mechanically removing said rigid projection(s) so formed resulting in the formation of one or more slots extending completely through said object between said first and second surfaces. - View Dependent Claims (13, 14)
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Specification