Conversion pad with moisture barrier

a technology of conversion pads and moisture barriers, which is applied in the field of conversion pads for sanding tools, can solve the problems of warping of many materials used for conversion pads, inconsistent or uneven sanding of work surfaces, and interference with sanding operations, etc., and achieves improved warp resistance, improved sanding characteristics, and easy manufacturing

Inactive Publication Date: 2005-10-13
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0004] As a result, the needs exists for an affordable conversion pad with improved sanding characteristics. In particular, the need exists for a conversion pad that resists warping in either high moisture (i.e. wet or high humidity environments) and in low moisture (i.e. low humidity) environments. It would therefore be desirable to provide a conversion pad that is easy to manufacture and has improved warp resistance in both high and low moisture environments.

Problems solved by technology

In the past, to change from an abrasive article having one attachment system to an abrasive article having another attachment system (e.g. changing from an abrasive article having a hook and loop attachment system to one having a PSA attachment system), it was necessary to change the back-up pad itself because a back- up pad designed for one attachment system generally does not securely attach an abrasive article designed for a different attachment system.
Many materials used for conversion pads, however, are susceptible to warping in wet or high humidity environments, or in low humidity environments.
A warped conversion pad can interfere with the sanding operation by producing inconsistent or uneven sanding of the work surface.

Method used

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  • Conversion pad with moisture barrier
  • Conversion pad with moisture barrier

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example

[0025] A conversion pad having the construction shown in FIG. 1 was prepared as follows. A 30 mil thick vulcanized fiber backing available from 3M Company, St. Paul, Minn. was coated on both major surfaces with PU-40 polyurethane available from Illbruck, Inc., Minneapolis, Minn., thereby creating barrier layers that protected the backing from water and moisture. The coated backing was then affixed to an attachment member having a plurality of J style hooks using 3M Company hot melt adhesive HM 115-50, a heat resistant nylon hot melt adhesive.

[0026] The warping characteristics of the conversion pad were evaluated by storing it together with a similar conversion pad that did not include the protective polyurethane coating layers for the same amount of time and under the same temperature and humidity conditions. The conversion pad of the invention was found to undergo significantly less warping than the conversion pad that did not include the protective polyurethane coating when expos...

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Abstract

A conversion pad for attaching an abrasive article to a sanding tool includes a supporting layer comprising a backing material and a moisture barrier arranged on at least a portion of the supporting layer, thereby to protect the backing material from moisture, and a layer of attachment material affixed to the supporting layer for attaching the abrasive article to the conversion pad.

Description

FIELD OF THE INVENTION [0001] The present invention relates generally to sanding tools and, more particularly, to a conversion pad for a sanding tool, such as an edger sander or random orbit sander, that resists warping. BACKGROUND OF THE INVENTION [0002] When using a power sanding tool, such as an edger sander or random orbit sander, an abrasive article, such as an abrasive disc or sheet, is attached to the back-up pad of the tool. During sanding, the operator may be required to frequently replace a worn abrasive article or change from one abrasive article to another depending on the finishing step. In the past, to change from an abrasive article having one attachment system to an abrasive article having another attachment system (e.g. changing from an abrasive article having a hook and loop attachment system to one having a PSA attachment system), it was necessary to change the back-up pad itself because a back- up pad designed for one attachment system generally does not securely...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B24B23/00B24D9/08B24D11/02
CPCB24B23/005B24D11/02B24D9/085
Inventor FISHER, DANIEL J.
Owner 3M INNOVATIVE PROPERTIES CO
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