Goodyear Retread Manufacturing Training Series

[Music] welcome to goodyear's retread manufacturing training series this training module is designed to assist you in manufacturing retreads that will help fleets lower their operating costs the information in this course has been developed to help you attain and maintain high quality and consistent workmanship the goals of this course are to explain how retreading fits into goodyear's business explain the goals and expectations of retread manufacturing and list the steps involved in the retread process retreading is an important component of goodyear's total solution for fleets many fleets use retreading to help optimize the return on their new tire investment and lower their operating costs this gives us an exciting opportunity to help fleets achieve these important objectives the ultimate objective of retreading is to help fleet customers lower their operating costs let's quickly review the steps in the retread manufacturing process initial inspection tire repair buffing building curing and final inspection and finish goodyear's exclusive goodyear tracking retread automated casing system otherwise referred to as g-tracks is a computerized tracking system designed to assist the retread plant manager retread manufacturing associates and fleet customers g-tracks enables all parties to track the progress of a casing through the retread manufacturing process ensuring that manufacturing specifications are met g-trax also provides critical data for sales and customer use click each button to learn details about each step in the retread manufacturing process before advancing in the module the first step in the process is initial inspection initial inspection uses a combination of visual and electronic detection to determine if a casing is suitable for further processing we must determine if any repairs are required prior to retreading if the casing can be retreaded or if the casing is beyond repair if the inspection reveals that a repair is required the area and type of repair are marked on the tire and the casing is sent to the tire repair area if the casing passes inspection it's sent directly to the buffing area if the tire is not suitable for retreading or repair it's returned as received to the customer the next step is tire repair some casings may need to be repaired prior to retreading in fact many tires are brought in for repair only there are several repair procedures that can be performed on a casing the size and location of the damage will dictate the repair procedure used simple nail holes or punctures are common in the event of a nail hole repair if the casing is serviceable and will not be heat cured a plug and patch using chemical cure cement must be used if the tire is to be heat cured heat cure cement rope rubber and a patch are used spot repairs are rubber only repairs there is no limit to the number or size of spot repairs that can be performed as long as the steel or fabric of the casing is not damaged to perform a spot repair the injury is leveled and filled with rope rubber the repair is then vulcanized using a spot repair vulcanizer or curing chamber section repairs are performed if the casing's wires or fabric are damaged and the area involved exceeds 5 16 in diameter if the injury is on the shoulder or side wall of the casing a section repair also may be required there are limits to the size and number of section repairs in a tire bead repairs also may be performed as long as the repair involves rubber and fabric only if wire has been damaged the bead area cannot be repaired if the operator exposes the wire on a tire bead but does not damage the wires the area must be cemented immediately and rope rubber or pre-cured cushion gum should be used to build up the area when the area is built up slightly more than the surrounding area it's ready to cure next is buffing in order to retread a casing the old tread must be removed and the surface must be prepared to receive a new tread buffing machines are designed to remove the old tread and leave a clean properly contoured texturized surface to accept the new tread while the tread is being buffed off the operator may find hidden defects such as sharp rocks or glass embedded in the casing these objects must be removed and the area must be repaired before moving on to the next step in the process the common terms for this process are buzz outs and sky valves it's important to note that after buffing the prepared surface must be kept clean the tire should never touch the ground once it is buffed next is building if the casing is intended to receive a pre-cured tread application after the buffing process the buffed area is coated with an extruded rubber cushion applied by the cushion extruding machine since the casing has been cured and the tread has been cured this step is critical as uncured rubber must be placed between the two following application of the cushion the casing is moved to the building area the two main building machine types are pre-cure and unicircle the type of building process used will be determined by the tread that's being requested and the casing's suitability let's talk about pre-cure building first pre-cure building is the most popular retread process because of the wide variety of tread designs and sizes that are available pre-cure means just what it says the rubber that is applied to the casing has a tread design already cured in the tread has been cured prior to being applied to the tire and is available in a variety of widths designs and compounds the pre-cure builder mounts the casing on the machine and applies the tread some tread comes in a 33 foot long strip so it must be cut to length a piece of uncured rubber is then placed between the ends of the tread to form the splice the splice is held with staples until curing takes place goodyear unicircle treads come in a seamless circle when applied to the casing the spliceless unicircle tread is stretched like a rubber band the casing is then placed in the center of the tread and the tread is released to fit around the casing of the tire next is curing during the curing process time temperature and pressure are critical in order to bond the casing to the tread we must create a pressure differential between the inside of the casing and the outside of the tread the process used to accomplish this is called enveloping a vent pad is applied under the envelope to allow air to escape the envelope is used to prevent chamber air pressure from migrating under the tread edges the envelope is a rubber membrane that encompasses the outside of the tire from bead to bead there are two common methods used to seal off the envelope at the bead areas on biased tires bag and rim components are required on radial tires the sure lock system is more common the sherlock system allows for less curing time the bag and rim system will work on radial casings but it's more time consuming than sherlock reductions of 20 to 30 percent of cure time over conventional bag and rim curing can be expected since radial casings have minimal shrinkage an adjustable ring is used to seal the envelope at the bead areas these adjustable rings are called sherlocks prior to placing the unit in the curing chamber it's critical to check the envelope for leaks this is done by applying vacuum to the envelopes the unit must hold vacuum to help ensure proper pressure during the curing process and to help prevent re-runs as each pre-cure retread is placed in the curing chamber an exhaust hose is attached to the adapter of the envelope if bag and rim equipment is used a pressure hose is attached to the tube adapter to help provide pressure to the inside of the tire the size of the chamber will determine the number of tires to be cured at one time once the chamber door is closed and locked the operator will set a timer this will determine when the curing process is complete the inside of the chamber will be pressurized and the envelopes will exhaust pressure through the exhaust hose to the outside of the chamber this will create the differential pressure that will hold the tread to the casing with the force required to help ensure proper curing throughout the curing process recorders will monitor the time temperature and pressure of the chamber allowing an operator to make any necessary adjustments to maintain high quality curing at the end of the curing time the chamber will release pressure the tires will be removed the sherlocks and envelopes will be removed from the tires and the tires will be sent to the last step of the process final inspection and finish while everyone's job is to inspect the casing at every station final inspection is very important the inspector must check for many items including separations the quality of repairs liner blisters the splice if the retread is pre-cured dot information and overall appearance the matuzi g100 high pressure tester can be used to detect separations possible casing fatigue missed nail holes and tread misalignment the high pressure tester allows the operator to visually inspect for conditions at different pressure levels it's very important that the tire be inspected at each of the pressure levels a condition that shows up on the lowest pressure level could cause a rupture at a higher level since there's always a chance that a tire can rupture while under pressure be sure you don't lean against the machine while testing and inspecting the tire final finish is where we make the tire look new the final finisher will trim vents remove splice staples buff and trim all spot repairs and then apply black tire paint to the side walls of the newly retreaded tire by following this goodyear authorized retread process you're equipped to produce a premium quality goodyear retread that can help fleet customers lower their operating costs [Music]

Channel: Goodyear Truck Tires

Views: 33,755

Keywords: Goodyear, The Goodyear Tire and Rubber Company, Tires, Trucking, Retread, Retreading, Unicircle, Retread Manufacturing, Retread Process, Retread Training, Goodyear Retread Training

Id: IlJfm6fKeWc

Length: 11min 28sec (688 seconds)

Published: Wed Jul 17 2019