Facing sheet edge trimming

• US 4,065,333 A
• Filed: 03/31/1977
• Issued: 12/27/1977
• Est. Priority Date: 03/31/1977
• Status: Expired due to Term

• Current Assignee: National Gypsum Properties LLC
• Original Assignee: National Gypsum Properties LLC
• Inventors: Winkowski, Daniel A., Rodgers, Bernard L., Lawlis, John L.
• Primary Examiner(s): Drummond, Douglas J.
• Application Number:
  US05/783,155
• Time in Patent Office: 271 Days
• Field of Search: 156/153, 156/154, 156/216, 156/267, 156/250, 156/268, 156/487, 156/40, 51/328, 51/324
• US Class Current: 156/40
• CPC Class Codes: B24B 9/002 for travelling workpieces
• CPC Class Codes: B24B 9/20 of plastics
• CPC Class Codes: B24D 13/10 comprising assemblies of brushes
• CPC Class Codes: B29C 2793/00 Shaping techniques involving a cutting or machining operation
• CPC Class Codes: B29C 63/044 continuously B29C63/065, B29C63/105 take precedence
• CPC Class Codes: B29C 65/1458 once, i.e. contour welding
• CPC Class Codes: B29C 65/1464 making use of several radiators
• CPC Class Codes: B29C 65/749 Removing scrap deburring welded articles B29C37/04
• CPC Class Codes: B29C 65/7894 of continuously moving sheets or webs
• CPC Class Codes: B29C 66/1122 Single lap to lap joints, i.e. overlap joints B29C66/45, B29C66/472, B29C66/52272 take precedence
• CPC Class Codes: B29C 66/431 Joining the articles to themselves B29C66/4322 and B29C66/4332 take precedence
• CPC Class Codes: B29C 66/83413 cooperating rollers, cylinders or drums
• CPC Class Codes: B32B 13/08 of paper or cardboard
• CPC Class Codes: B32B 2038/0016 Abrading
• CPC Class Codes: B32B 2607/00 Walls, panels
• CPC Class Codes: B32B 27/10 of paper or cardboard
• CPC Class Codes: B32B 3/04 characterised by at least one layer folded at the edge, e.g. over another layer ; characterised by at least one layer enveloping or enclosing a material
• CPC Class Codes: Y10T 156/1034 Overedge bending of lamina about edges of sheetlike base
• CPC Class Codes: Y10T 156/1052 with cutting, punching, tearing or severing
• CPC Class Codes: Y10T 156/108 Flash, trim or excess removal
• CPC Class Codes: Y10T 156/1082 : Partial cutting bonded sandwich [e.g., grooving or incising]

Abstract

Plastic sheet material, laminated to the front face and side edges of wallboard, having excess sheet width at each side edge, is uniformly and rapidly trimmed to a neat skived edge which becomes firmly adhered to the wallboard edge, by abrading through the sheet material with a rotary abrader such as a nylon brush.

Claims

1. The method of making a plastic sheet covered wallboard with the plastic sheet extending uniformly from on one side edge of said wallboard across the face of said wallboard to onto the opposite side edge of said wallboard comprising the steps of laminating a thin plastic sheet onto the entire front face of a wallboard with side portions of said plastic sheet on each side having a width greater than the thickness of said wallboard at the edges, folding said plastic sheet side portions and adhering said plastic sheet side portions to the two side edges of said wallboard with an excess portion of said plastic sheet extending beyond the edge back corner on each side edge of said wallboard, trimming said excess portion from said plastic sheet covered wallboard, said trimming comprising the steps of disposing a rotary abrader having flexible abrading elements extending radially outwardly adjacent said edge back corner and rotating said rotary abrader with said abrader periphery engaging said plastic sheet at said edge back corner with a motion relative to the board edge in a direction from the front face toward the back edge corner, abrading said plastic sheet with said abrader with sufficient force to penetrate said plastic sheet, and moving said wallboard relative to said rotary abrader to provide said abrading action progressively along the full length of said edge back corner, whereby said abrading severs said excess portion from said wallboard.

2. The method of claim 1 wherein said excess portion is slit into a plurality of segments before being trimmed from said wallboard.

3. The method of claim 1 wherein said abrader is a rotary brush.

4. The method of claim 2 herein said brush is made of nylon fibers.

5. The method of claim 1 wherein said rotary abrader is urged against said plastic sheet by springs engaging the rotary abrader drive means, and said plastic sheet is applied to a succession of wallboards as a continuous plastic web.