Cold splicing of fabric ply conveyor belts with the contact adhesive ...

Cold splicing of fabric ply conveyorbelts with the contact adhesiveCONTI SECUR ® BFA© 2004 by ContiTech TransportbandsystemeGmbH, Northeim. All rights reserved.ContiTech - Division of Continental AG

Splicing of conveyor belts with more than two fabric pliesThe stepped cuts in the fabric produce a loss in strength in these splices calculatedas one ply.Examples:3 ply belt will lose 33 % of the strength in the splice (2 steps).4 ply belt will lose 25 % of the strength in the splice (3 steps).5 ply belt will lose 20%. of the strength in the splice (4 steps).For certain belt types, the minimum step length Is of splice length Ic and thenumber of steps ns can be found in Table 1.Example:Belt type: 1000/3Strength of 1 ply: 333 N / mm (1000 divided by 3)Minimum Step length for this value: 300 mm (Table 1)Splice length: Is = 300 • (3 – 1) = 600 mmStep DirectionIf the scraper are working hard, the splice should be made in that way, that thescraper is not scraping against, but moving with the stepped design.Running againstRunning with the stepsTable 1Recommended minimum step and splice lengths for conveyor belts with morethan 2 pliesBelt strengthN/mmStrengthof 1 plyN/mmMin.step lengthls mmSplice lengthlc mm400/3 200 400 2500/3 200 400 2125 to 160500/4 200 600 3630/4200 600 3No. of stepsns800/4 250 750 31000/4 250 750 3200 to 2501000/5 250 1000 41250/5250 1000 41250/4 300 900 31600/4 300 900 3315 to 4001600/5 300 1200 42000/5300 1200 42000/4 300 1050 32500/4 350 1400 3500 to 6302500/5 350 1400 43150/5350 1400 4ContiTech - Division of Continental AG

Cut the belt with a trailing angle. The angled join prevents the join from beingstressed over the entire width of the belt when it bends around the pulleys andidlers.Great angle > less stress. An angle of 16°40 has proven to be a standard(0,3 x belt width).• Folding back the belt• Preparation of the seam• Roughen interfaces between the covers and rubber edges• Remove the dust with a brush, no solventChoose step length. Mark the step- and splice length. Look to Table 1.© 2004 by ContiTech TransportbandsystemeGmbH, Northeim. All rights reserved.ContiTech - Division of Continental AG

Cut the fabric plies with a ply cutter.Strip off the first fabric ply.Stripping off the last of the fabric plies.ContiTech - Division of Continental AG

• Check for the exact dimension• This is important after finishing the splice for the straight running of the belt• Smooth, if necessary the part of the skim rubber with a grinding disc• Remove the dust dry, don’t use a solvent• Coat the splice area with the activated CONTI SECUR® BFA• Depending of the strength of the fabric it’s necessary to decide how manycoats you have to apply• The fabric has to be complete covered with solution• Drying time see Table 2Table 2Number of coatsDrying time of the coats by roomtemperature1 st coat min. 30 min., max. 24 hours2 nd coat Back of hand test, max. 20 min.Or if it’s necessary to coat the splicesurface three times:1 st coat min. 30 min., max. 24 hours2 nd coat min. 30 min., max. 24 hours3 rd coat Back of hand test, max. 20 min.© 2004 by ContiTech TransportbandsystemeGmbH, Northeim. All rights reserved.ContiTech - Division of Continental AG

• Fit together the prepared surfaces and roll down the surface from the centreto the edges with a double rollerRemark: with this tool you will get the needed pressure into the splice.The pressure is absolute necessary for getting the adhesion between the plies.ContiTech - Division of Continental AG

• Coat the tacky back of the cover strip and the seam with the activatedCONTI SECUR® BFA• Drying time: 5 to 10 minutes• Fix and press down the CONREMA® cover strip• Edges projecting on either side can be cut off flush with the coverFinished splice.Don’t tension the belt before 2 to 5 hours after splicing.© 2004 by ContiTech TransportbandsystemeGmbH, Northeim. All rights reserved.ContiTech - Division of Continental AG

ContiTechSpecialist in rubber andplastics technologyContiTechTransportbandsysteme GmbHWe are a company of the ContiTech Group. 120years of experience in rubber processing and acomprehensive range of products and serviceshave made us the leading manufacturer of conveyorbelts and service materials that meet variousrequirements in every industry. The product rangeextends from textile and steel conveyor belts tospecial conveyor belts with a wide variety of accessories.Our products and services remain state-of-the-artthanks to continuous research and developmentbased on careful basic research. We evaluate ourongoing material investigations and practicaltesting in collaboration with our raw materialssuppliers. This gives rise to products that combinereliability and long life for every materials-handlingtask at an optimum cost/benefit ratio. We provideour customers with all-round service. It extends toconsultation in planning conveyors and in-serviceproduct support.DisclaimerThe content of this document is provided for information only and without responsibility. ContiTech TransportbandsystemeGmbH makes no representations about the accuracy, reliability, completeness or timeliness ofthe information in this document. ContiTech Transportbandsysteme GmbH may, in its sole discretion, revisethe information contained herein at any time without notice.ContiTech Transportbandsysteme GmbH's obligations and responsibilities regarding its products aregoverned solely by the agreements under which they are sold. Unless otherwise agreed in writing, theinformation contained herein does not become part of these agreements. This document does not containany guarantee or agreed quality of ContiTech Transportbandsysteme GmbH’s products or any warranty ofmerchantability, fitness for a particular purpose and non-infringement. ContiTech TransportbandsystemeGmbH may make changes in the products or services described at any time without notice.This document is provided on an "as is" basis. To the extent permitted by law, ContiTech TransportbandsystemeGmbH makes no warranty, express or implied, and assumes no liability in connection with the use ofthe information contained in this document. ContiTech Transportbandsysteme GmbH is not liable for anydirect, indirect, incidental, consequential or punitive damages arising out of the use of this document.Information contained herein is not intended to announce product availability anywhere in the world.ContiTechTransportbandsysteme GmbHWerk NortheimBreslauer Straße 14D-37154 NortheimPhone +49 (0) 55 51 / 7 02-207Fax +49 (0) 5551 / 7 02-504E-mail: transportbandsysteme@tbs.contitech.dewww.contitech.de/transportbandsystemeThe trademarks, service marks and logos displayed in this document are the property of ContiTech TransportbandsystemeGmbH and/or its affiliates. Nothing in this document should be construed as granting anylicense or right to the Trademarks. Without the express written consent of ContiTech TransportbandsystemeGmbH the use of the Trademarks is prohibited.All text, images, graphics and other materials in this document are subject to the copyright and other intellectualproperty rights of ContiTech Transportbandsysteme GmbH and/or its affiliates. ContiTech TransportbandsystemeGmbH owns the copyrights in the selection, coordination and arrangement of the materials inthis document. These materials may not be modified or copied for commercial use or distribution.Copyright © 2004 by ContiTech TransportbandsystemeGmbH, Northeim. All rights reserved.ContiTech - Division of Continental AG