Backup board for machining process

a back-up board and machining technology, applied in the field of back-up boards, can solve the problems of poor workability of laminated resin plates, easy wear and tear and easy warping of paper-based resin plates with dimensional changes, so as to reduce the abrasion of the bits of machining tools, reduce material weight, and enhance workability

Inactive Publication Date: 2005-08-11
MATSUSHITA ELECTRIC WORKS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008] The backup board for use in a machining process in accordance with the present invention includes a core of light weighted fibrous layer, which has a density of about 600˜900 kg/m3, and a surface lamination of hard and smooth surface, incorporating the benefits of a large reduction in the material weight

Problems solved by technology

However, the laminated resin plate has a poor workability due to its heavy weight with its specific gravity of about 1.4.
Furthermore, due to the overall hardness of the laminated resin plate, the bits of a drill and/or router tend to be easily worn out.
Another problem associated with using the la

Method used

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  • Backup board for machining process
  • Backup board for machining process
  • Backup board for machining process

Examples

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example

[0040] Long fiber bundles (width: about 1˜2 cm, length: about 2˜4 m) obtained from the bast of the kenaf stem were mechanically fiberized until the average length and the average diameter of the kenaf fibers reached about 25 mm and about 100 μm, respectively. (The standard deviation in the fiber length was about 16 mm and that in the fiber diameter was about 41 μm.) Then, these kenaf fibers were piled up and needle-punched into a fibrous mat. After dipped in a phenolic resin adhesive, this fibrous mat was squeezed through a squeeze roller so that the content of the phenolic resin adhesive was adjusted to about 25 weight %. The phenolic resin adhesive used in the Example was a resol-type phenolic resin adhesive (resin component content: 50 weight %; pH 9.0; free-phenol content: 1.4 weight %; free-formaldehyde content: 0.06 weight %) having the average molecular weight of about 584 including the monomers of molecular weight of about 90˜200 and the polymers of molecular weight of about...

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Abstract

A backup board for use in a machining process includes a fibrous layer, at least one side of the fibrous layer being provided with a surface layer adhered and laminated thereon, wherein the surface layer is made of a cured paper impregnated with a thermosetting resin. The fibrous layer has a density of about 600˜900 kg/m3 and includes kenaf fibers adhered together by impregnating a thermosetting adhesive into a fibrous mat of the kenaf fibers, the kenaf fibers having an average length of about 10˜200 mm and an average diameter of about 10˜300 μm.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a backup board for use in machine-shaping processes such as routering, autocut sawing and drilling of a print circuit board. BACKGROUND OF THE INVENTION [0002] When drilling and / or routering a printed circuit board (PCB), a backup board is used to support the PCB either by applying it to the rear side of the PCB or by sandwiching the PCB with the backup boards. By using the backup board, a copper film of the PCB can be prevented from burring off during a drilling and / or routering process. [0003] Conventionally, a backup board has been of a wooden board used for construction purpose, such as a particle board. However, a higher precision is required in processing the PCB these days and burrs on a copper film need to be reduced even more. [0004] To lower the occurrence of burrs on a copper film, therefore, the backup board surface needs to be harder and smoother. A laminated resin plate made by processing a pile of prepregs...

Claims

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Application Information

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IPC IPC(8): B27N3/04B23B35/00B23B41/00B26F1/16B32B5/00D04H1/425D04H1/587H05K3/00
CPCH05K3/0047H05K2201/0278H05K2203/0156H05K2203/0214Y10T408/03Y10T408/36Y10T29/5107Y10T29/49126Y10T29/5105Y10T428/12444Y10T428/24994Y10T442/2738Y10T442/60Y10T442/652B23B41/00B27N3/04D04H1/58H05K3/00
Inventor UMEOKA, KAZUNORIFUJIOKA, TORUANDOU, HIDEYUKIOKUDAIRA, YUZO
Owner MATSUSHITA ELECTRIC WORKS LTD
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