Belstaff Black Friday Canada Goose Black Friday Furla Black Friday Juciy Couture Black Friday Moncler Black Friday belstaff black friday Cheap Canada Goose Black Friday Furla Black Friday Furla Cyber Monday juciy couture cyber monday Moncler Jackets Cyber Monday Original Belstaff Black Friday Canada Goose Jackets Cyber Monday Furla Cyber Monday Juciy Couture black friday Cheap Moncler Outlet Black Friday Belstaff Black Friday Canada Goose Black Friday Furla cyber monday Juciy Couture black friday Moncler Cyber Monday Armani Watches Cyber Monday Breitling Watches black friday Cheap Cartier Watch Black Friday Casio cyber monday Longines Black Friday Sales Cheap Michael Kors Watches Black Friday Omega Watches Black Friday Rolex Watches Black Friday Tag Heuer Watches Black Friday Discoun Armani Watches Black Friday Authentic Armani Watches Black Friday Armani Watches Black Friday Armani Watches Black Friday Armani Watches Black Friday Armani Watches Black Friday Cheap Michael Kors Watches Black Friday Discount North Face Jackets Black Friday Cheap North Face Coats Black Friday Cheap North Face Coats Black Friday Cheap North Face Coats Black Friday Cheap North Face Coats Black Friday Cheap North Face Outlet Black Friday North Face Vest Cyber Monday Cheap North Face Jackets Cyber Monday North Face Backpacks Cyber Monday North Face Backpacks Cyber Monday The North Face Jacket Cyber Monday Factory Outlet Online North Face Jackets On Sale Black Friday Discount North Face Black Friday North Face Fleece cyber monday North Face Shoes black friday Michael Kors Outlet Black Friday Sales Michael Kors Purses Cyber Monday Factory Outlet Online Michael Kors Purse outlet black friday Michael Kors Wallet Black Friday Michael Kors Wallet Black Friday Michael Kors Wallet Black Friday Michael Kors Wallet Black Friday Cheap Michael Kors Watches black friday Cheap Michael Kors Watches black friday Michael Kors Ladies Watches Cyber Monday Discount Michael Kors cyber monday
United States Supply Company
International Suppliers to Printing and Textile Finishing

PROCEDURE FOR DRY GRINDING A RUBBER BELT

USING NO-TALC GRINDING CLOTH

 

PREPARATION FOR GRINDING

  1. Completely cool the Rubber Belt (RB) before grinding.

  2. Measure and record the RB thickness and durometer (hardness).

  3. Check the inside of the RB for any buildup of material and remove if found. Pay special attention to the compression roll. Hollow spots will be ground into the surface of the rubber belt if any buildup exists on this roll.

  4. Dust the inner and outer surfaces of the RB, when dry, with talcum powder. (NOTE: When dry grinding no water is used on either the inside or outside belt surface).

  5. Check the condition of the grinding cloth and grinding roll. Make sure the cloth is tight and there are no overlaps or gaps between wraps. Also check that the cloth is truly continuous, without seams or splices. (NOTE: The standard abrasive used is 60-80 grit (USA standard)).

  6. Make sure the grinding roll is parallel to the compression roll and that the compression roll is also parallel to the steam cylinder on both sides. (Use interior calipers or a slide gauge between both rolls to confirm this setting).

  7. The compression roll should be set at zero (no compression). The grinding roll should not be touching the RB at this stage, but located 1/8" (3mm) away. (Note: The significance of this setting is to insure that the RB is moved to the grinding roll when the grinding begins. You can not move the grinding roll into the belt).

  8. Increase Rubber Belt Tension. This flattens the edges of the RB to insure an even grind across the entire belt. (Note: The use of a straight edge can be beneficial. Lay it on the RB face hanging over its edge. Increase the tension until the gap between the straight edge and RB is removed or at least greatly minimized).

  9. Bring the water removal rolls in light contact with the belt. This helps keep the belt steady during grinding.

Note: It is recommended that an ammeter be used as a guide for controlling the grinding operation. An ammeter monitors the amount of pressure applied by the Grinding Roll. Excessive pressure can result in chatter marks on the belt's surface and other undesirable effects.


GRINDING

  1. Start the RB machine at a slow speed, approximately (5) yards per minute.

  2. Start the grinding roll. Its speed should be approximately 1750 RPM. (NOTE: As a precautionary measure, we recommend that all subsequent starts of the RB and grinding roll be in the order described above. Conversely, all stops should be in the opposite order, i.e., stop the grinding roll completely before the RB).

  3. Take note of the "no load" reading of the ammeter. This varies per machine, but should be close to (5) amps.
  4. Slowly back the compression roll towards the stationary-grinding roll until the ammeter reads a steady (10-12) amps. Continue grinding until the ammeter approaches its initial "no load" reading.

  5. HINT: Although NO-TALC Grinding Cloth (Rubber Belt Maintenance Products) is designed to be used with very little talc through the course of a RB grind, it is usually a good idea to add ample talcum powder for the first (10-15) minutes of the grinding operation. This prevents the grinding cloth from loading up if the surface of the RB is sticky or gummy.

  6. Continue feeding the RB towards the grinding roll, as outlined in No. 4 above, until the belt achieves a "new" surface appearance.

  7. Once the RB has this "new" appearance, stop both the grinding roll and the RB machine, as outlined in No. 2 above, in order to check the durometer or hardness of the RB.

  8. Using an "A"-type durometer, check the RB to see if it has reached the desired hardness. (NOTE: The desired hardness equals the belts original durometer when new. Check the retained copy of the "Certificate of Compliance" that was included in the Informational Packet adhered to the belts plastic wrap).

  9. It is very important to check the durometer across the entire belt width in 50mm (2") increments. Pay special attention to the hardness of the belt in the selvage area.

  10. For a correct and complete grind, the hardness of the RB must be returned to its original reading and should be consistent across the entire width.

  11. If the hardness has not been rejuvenated, continue the grinding operation until this is achieved.

  12. After renewing the entire surface of the belt, the grinding roll and RB should be allowed to run with light contact for about (10-15) minutes, without further feeding of the RB against the grinder. (NOTE: A light dusting of talc, applied as a lubricant during this stage, will greatly aid in obtaining a fine surface finish).

    AFTER GRINDING

  13. After grinding is accomplished, move the RB away from the grinding roll. Stop both the grinding roll and the RB machine.

  14. Check the RB edges for breaks or cracks and remove any found. Round off the edges of the RB using a belt or circular sander.

  15. Clean the entire machine, removing all loose rubber particles and talc from inside and outside the RB and surrounding area.

  16. Check all rolls, including the guide or stop rolls for bearing failure. Check all water lines for proper operation and direction of water flow. (Cross sectional Rubber Belt unit diagram). Check felt doctor blade or brush for proper position.

  17. Reset Rubber Belt Tension. (Procedure for Tensioning).

  18. Adjust Shrinkage Control Plate to "0" setting. Use calipers to determine the new thickness of the RB. Move the compression roll this exact distance from the steam cylinder, being sure both sides are equal-distant. Move the shrinkage control plate to "0" and tighten.

  19. Wash the RB (Procedure For Cleaning A Rubber Belt) with a non-chlorinated soap, such as "Boraxo". (Rubber Belt Maintenance Products). Cleaning the RB after grinding relieves surface tension, allowing the cooling water to better adhere to the belt.

  20. Record the RB's thickness and durometer. (Download SHIELD Belt Record keeping format)

    THE RUBBER BELT IS NOW READY FOR USE.

 

Should you have any questions concerning this process, the products used in this process (Rubber Belt Maintenance Products), or have Difficulty in Grinding, please contact us via support@ussupplyinc.com or Fax 704-393-5628 or Tel 704-399-4276.

Copyright 1997 United States Supply Co., Inc. All Rights Reserved

 

Related Information:

Procedure For Installing A Rubber Belt
Procedure For Tensioning A Rubber Belt
Procedure For Cleaning A Rubber Belt
Rubber Belt Maintenance Products
Cross Sectional Rubber Belt Unit Diagram
Difficulty In Grinding (Trouble-Shooting).
SHIELD Belt Record

printer.gif (1704 bytes)

Printer Friendly Version