TYRE RETREADING PROCESS PDF

5 Jun Initial Inspection. The first part of the retreading process is to inspect the tyre to see whether it meets with our stringent quality specifications. Tyre Retreading by Hot Retreading Process. S. Ajeeth Kumar*. UG scholar, Mechanical department, Sethu institute of technology, Madurai, India. There’s a reason STTC only uses MRT—no other inspection and retread process utilizes Michelin new-tire technology, materials, and quality standards to.

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Without the flap the curing bag comes in contact with the heat which weakens the curing bag.

Aquaplaning Groove wander Slip vehicle dynamics Tramlining. State of retreadig Art Autoclave software package. This increases your work place safety and productivity. Roller Covering Extruder Plant. Precure retreading has become fully established in the truck tyres sector since the introduction of radial tyres in the mids. The Process of Retreading landingnet T The buffed rstreading needs a thin layer of cushion gum to be wrapped around its crown area.

The final inspection is done to ensure that the quality of the retreaded tyre is good.

With professional planning from Newera engineers, you can be assured of workstations designed to maximize output and ease workflow. The purpose of the flap is to increase the life of the curing bag, so that the flap absorbs the heat during tgre curing process.

In Europe all retreads, by law, must be manufactured according to EC Regulation car tires or commercial vehicle tires. A continuous strip of premium rubber compound is wrapped around the tyre whilst it revolves on an inflatable chuck.

The whole process is computer-controlled to ensure that the correct amount of rubber is applied. Building During the Building process, new tread material is applied, or stitched, to the casing using a patented computer-controlled process. A wide range of tread types are available, allowing the optimum tread to be selected for the tyre application. Extruder gun Tire Spotter. The Department of Transportation requires marking of a “DOTR number” which shows the name of the retreader and when it was retreaded.

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Modern plants have their casings hoisted by monorail systems. This calls for a central production workshop, an extended customer area and therefore brings with it relatively high logistics costs. Retreadkng skived surface should be made rough by rasping. The precure retreading process is kind to the carcass, since vulcanisation temperatures are lower and put less strain on the rubber-metal bonds in the carcass.

Retreading is a procedure offering tyres a second life, supplying a new tread to a worn our tyre. Retreading is applied retrfading casings retdeading spent tires that have been inspected and repaired. To build a truck tyre 70 kg of rubber are needed for the production of which liters of oil are needed.

The tread and the sidewall veneer of the tyre are made up of non-vulcanised rubber compounds. The repair station is where any surface injury is treated using effective material and tools for grinding and patching. The pre-cured tread rubber is then applied with the building machine. This occurs by means of six essential passages: Instead, by retreading, it is re-covered in great part, adding only a limited quantity of raw materials to replace the worn out tread.

Final Inspection The final inspection is done to ensure that the quality of the retreaded tyre is good. In order to locate any minute holes within the inner wall, the casing is subjected to a penetration detection retreeading which involves high voltage electricity being passed through the tyre whilst it is rotated.

The bonding gum is applied on the tyre and the stitching is done at low pressure.

The Process of Retreading

procesa Only when it got the corresponding approval, the tyre is given back to the Customer. If the casing is in good condition, it can be used as a base for a new retread tire. The first and important step in the process of retreading is the detailed inspection of casing. To understand this figure, it is equivalent to lining up passenger tires tread to tread from roughly Los Angeles to San Diego or Philadelphia to Washington DC.

This is important to ensure that the tyre is built to the exact specified dimensions required for its particular matrix. Previously prepared tread strip is applied to tire casing with cement. All retreaded tyres are encouraged to be returned with the sidewalls painted using a light coat of black tyre paint.

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A dedicated mold is required for each tire size and tread design. Material costs are lower than the more complex products required for precure retreading. There are two main processes used for retreading tires, called Mold Cure and Pre Cure. The injury should be inspected, and then cleaned out with a carbide cutter. Use of retreaded tires was common historically, but as ofit was seldom used for passenger vehicles, mainly due to discomfort on the procsss, safety issues and cheaper tire brands surfacing on the market.

Collection of Casings Worn tyres are collected to select suitable casings for tyre retread.

Tyre Retreading Process | Tyre Retreading

Therefore the tire is placed into an envelope which presses the precured tread uniformly on the cushion gum and the casing Application of Curing Bag, Flap and Curing Rim The correct size of curing bag and flap is inserted into the tyre according to the tyre size. Hot retreading also allows extensive repairs to be carried out on the tyre carcass e.

Retrieved from ” https: Views Read Edit View history. Electric Curing chamber is an autoclave type device that applies specified heat and pressure over a period of time which causes the bonding layer in the built tire to cure and permanently adheres the new pre-cured tread to the prepared casing.

A uniform layer of Black vulcanizing cement is applied on the crown of the tyre. Vacu-Lug Tyre Rescue 60 60 Archived copy as title. Building — Tread Rubber In the pre-cure system, the tread rubber has already been vulcanized with the new tread pattern design.