Precured retread tires process

(1) Before the test preparation

The specifications of the waste matrix, the type of tire No. renovation of the patterns and customer name, the initial storage of registration, to ensure that a tire and a card (to facilitate post-tracking);The carcass cleaning: tire clean and dry, to be able to conduct a comprehensive inspection.

(2) Primary check

1.The tread site to check the belt loose delamination, wire rusted to the extent and the assassination of the depth of the metal objects, excessive breakdown of the hole is too large should not be refurbished;
2.Adopted by the tire shoulder part of the percussion method. That’s percussion lined both sides of the fetal shoulder position, the internal situation in order to voice recognition. Check whether the belt ends piercing the sky and delamination, rubber degree of oxidation. The tire shoulder existence of delamination cracks the sky and rubber over-oxidation of the carcass should not be refurbished;
3.The tire side parts of the touch to check whether the steel radial from the wire breakage caused by swelling. Side of the explosion or wire from the drum, the carcass should not be refurbished;
4.Lined parts of the check and remove the old glue patch and impurities, careful observation of the small needle-stick injuries, and determine whether to use a different strength patch. Hole to fracture the number of wires as a unit, more than should not be refurbished;
5.Bead parts of the existence of deformation, rupture, from the depth wire is rusty, not refurbished.

(3) Matrix planing mill

1.Select the supporting steel ring or plywood carcass inflatable air tightness and the horizontal position; (usually standard atmospheric pressure :2-3Mpa);
2.The right planing mill process starting from the tread central position. Do after the grinding wheel contact to the rubber under the knife to the side of the tire shoulder move until the entire tread the knife on both sides of the tread, pay attention to the amplitude is not too large;
3.Planing mill process in case of metal objects or impurities, and shall promptly retracting stop to remove the foreign body, and check the wound depth and extent of whether it can continue to carry out renovation;
4.Attention to the curvature of the tread in the process, planing mill, normal standards of Arc: the highest point of both sides of the low 1 ° to 2 °, followed by the planing mill surface roughness should be moderate.

(4) To clean the wound (polished)

1.Radial tires
a.The blade is equipped with high-speed tools (15000 rev / min) to open the wound, rusty wire and the aging of rubber removal;
b.Using the probe cone and tungsten carbide grinding wheel tool with a low speed (4000 rev / min) removal of the steel wire, steel wire head wear to the tire rubber;
c.A wire brush with a low-speed tools to clean the wound rubber, will be removed due to burnt rubber grinding wound.
2.Nylon tire
The blade is equipped with high-speed tools to clean the wound, the grinding process, to set the saw blade and nylon line was 90 ° at right angles to the thread clean-up to the rubber;

(5) Matrix repair

1.A patch to select the appropriate intensity, according to the wound situation, the wound is located in the center of the patch, cook range marker to facilitate grinding;
Lined when sanding, please pay special attention to the vacuum tire inner liner, use a dedicated grinding wheel;
2.Polished finished with a vacuum cleaner to clean up lined with impurities, brush on the glue. To be dry patch to fit the exhaust pulley to both sides of the exhaust from the middle position;
3.Such as wound filled raw rubber, prior to partial curing the gel content option.

(6) Tread clean and brush the glue

1.Use a wire brush to clean the tread on the impurities, such impurities should not clean up the option of using gasoline to clean;
2.Prior to application of the brush glue and stir evenly coated with a brush or spray gun tread to be dry;
3.Glue ratio: 1:8 mixing time: 24 hours glue Status: concentration after lifting the pull filamentous.

(7) To fill the wound

1.A squeeze glue gun or plastic extrusion machine first warm-up to the standard temperature;
2.Using a single white cotton tile in the inside of the large wound until the tire shoulder to facilitate exhaust;
3.Underfill to ensure that each wound with tread phase level, be careful not to air to enter.

(8)  Posted tread

1.We must first determine the width and length of the tread rubber, the joints need to polish the rough surface, the distance between the connector and the connector to maintain more than 20cm, each tire can not be more than two joints. Brushing glue to be dry.
2.Select the supporting steel ring or plywood carcass inflatable air tightness and the horizontal position; (usually standard atmospheric pressure :2-3Mpa), Paste filler must select the appropriate width, both sides should be more than 2-3 mm width, to ensure that the rubber adequate. Compaction to both sides from the center of the exhaust.
3.Remove the pad adhesive tape, and the tread rubber are parallel to the veneer. Note joints to be polished in place, the glue must be dry! After veneer seams mouth fight nails fixed.
4.The use of canvas or glass plastic paper welt, to prevent the curing process, the packet envelope even with pad adhesive. Nailed breathable cloth and paste your logo.

(9) Accessories Installation and inspection procedures

1.Choose the right package envelope, inner tubes, flaps and rim, through the device for installation. To ensure uniform packet envelope offset, inner tubes, flaps in place (note that the inner tube gas nozzle and the packet envelope gas nozzle to maintain a 90 ° right angle to facilitate pipeline installation);
2.The installation of accessories tires put on track to be tested, the inner tube is first filled with air pressure (maximum pressure: 3MPa) packet envelope vacuum. Packet envelope leakage, keep the inner tube pressure, and rushed to the encapsulation comprising a certain pressure can clearly check the location of all leak or because of lack of gasket.

(10) Vulcanization process

1.Into the tank, pay attention to check the rims safety valve is open, in order to join the quick connector to enter the tank;
2.Close the tank door for curing, the first red inner tube pressure and tank pressure and open the heating switch, the standard curing temperature of 110 degrees to 120 degrees,
3.The curing temperature is reached to open the package envelope pressure, start the countdown to 180 minutes, during which to regularly check the tightness of the envelopes and tubes (about 20 minutes or so) to avoid the whole cans of tire quality problems because of a single flat tire ;
4.After curing, must wait until the internal air pressure to complete row of the net before the tank.

(11) And then remove the parts and the ultimate check

1.In orbit must wait until the packet envelope to cool, before operation;
2.The demolition of inner tubes and envelopes need to wear gloves, do not pull the gas nozzle position demolition is likely to injure the accessory service life;
3.Check tread from the dark, deformation, cushion gum and both sides of the plastic less sulfur and other joints. Check the patch in the lining curing completed;
4.The last tire pressure gas check.

(12) Safety knowledge

1.The workers during the production need to take safety measures, (such as: gloves, dust masks, earplugs, safety glasses, etc.)
2.The workshop prohibit smoking and other open flames, finishing plant health on a regular basis;
3.Planing mill every day for clean up of the tire powder accumulated too easy to cause a fire;
4.Glue mixer, since the independent, set up a space for placement of production.

Contact Info

Head Office / Visiting address:

Xiaowutang Industrial Area, 
Lingyuan Street, Jinjiang, 
Fujian, China 

Tel: +86-595-82882856
Fax: +86-59585696098

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