1. mushroom nail repair

Mushroom nail repair method is mainly used in the repair of tire crown, which is also the direct contact surface between our tire and the ground, and is also the most damaged position.

1. First, use the probe cone to check the perforation angle and size from the inside, so as to facilitate the repair master to determine the repair position and the size of the subsidy.

2. Clean the internal surface and reduce the secondary damage of sludge and residue to the tire.

3. Use a low-speed air drill to drill 3-5 times from the inside to the outside. Note that a suitable drill must be selected here to avoid drilling and winding of the steel wire in the tire.

4. Use the same method to drill 3-5 times from outside to inside until pink powder appears. The inner surface after drilling needs to be clean and tight (no loose steel wire, no rubber protrusions and no signs of oxidation).

5. Mark the range to be polished, which is about 15mm beyond the bonding area to facilitate gluing and tight closing.

6. Grind the inner surface to RMA1-RMA2 with a low speed sander.

7. Use a low-speed grinder to clean the surface with a soft wire brush, and then suck the dust from the tire. Here, be careful not to touch the head of the dust suction tube to the polished surface to avoid cross-contamination.

8. Apply room temperature vulcanizing agent to the polished surface and hole, and then wait for the vulcanizing agent to dry.

9. Install the mushroom nail, pay attention to the mushroom nail surface clean.

10. Press the head of the mushroom nail from the center out, making sure that it does not contain air. This is like a mobile phone film, if there is air, the use time and effect will be greatly reduced.

11. Apply sealant on the edge of mushroom nail. The sealant must be used for tire repair.

12. Remove the excess rubber rod of the mushroom nail and keep the allowance of about 3mm beyond the tread.

The above is the mushroom nail repair method, this method is widely used, just go to a tire repair shop can see, the technical content is not high. But in the operation must pay attention not to mix different brands of mushroom nails and room temperature vulcanizing agent. There was once a master who used up the vulcanizing agent during the repair process and casually found a brand of vulcanizing agent to repair, resulting in the non-bonding of the two vulcanizing agents and the enlargement of the tire wound.

II. Stopper Repair

Compared with mushroom nail repair, the repair process is more advanced, and the direction of repair is also expanded. Specific repair methods are as follows:

As with mushroom nail repairs, first treat the damaged surface.

1. First, use the probe cone to check the perforation angle and size from the inside, so as to facilitate the repair master to determine the repair position and the size of the subsidy.

2. Clean the internal surface and reduce the secondary damage of sludge and residue to the tire.

3. Use a low-speed air drill to drill 3-5 times from the inside to the outside. Note that a suitable drill must be selected here to avoid drilling and winding of the steel wire in the tire.

4. Use the same method to drill 3-5 times from outside to inside until pink powder appears. The inner surface after drilling needs to be clean and tight (no loose steel wire, no rubber protrusions and no signs of oxidation).

5. Apply room temperature vulcanizing agent evenly to the damaged hole.

6. Use auxiliary tools to install suitable plugs

7. Cut off the excess rubber stem of the plug stem and keep the allowance of about 3mm beyond the inner liner.

8. Mark the area to be sanded (approx. 15mm beyond the faying area).

9. Grind the inner surface to RMA1-RMA2 with a low speed sander. Here must be careful not to penetrate the inner layer, it is best to use 36 particle size, speed of 2700-4000rpm grinding wheel

10. Clean the surface with a low-speed grinding machine and a soft wire brush, and then remove the dust from the tire.

11. Apply the room temperature vulcanizing agent to the polished surface and hole, and then wait for the vulcanizing agent to dry.

12. Partially remove the patch protective film and align the center of the patch with the center of the wound. Note here that the bead expansion arms must be relaxed before fitting the patch.

13. Press the patch outward from the center, making sure it does not contain air.

14. Apply sealant to the edges of the patch.

15. Cut off the excess rubber rod of the plug stem and keep an allowance of about 3mm beyond the tread.

The above is the infarction repair method, the same in the repair process to prohibit the mixing of different brands of plug stem, patch and room temperature vulcanizing agent.

3. sidewall point vulcanization repair

Due to the difference of structure and organization, the repair process of damaged sidewall of tire crown is more complicated and has more technical requirements. Now the market mainly uses point vulcanization repair method. Specific as follows:

1. Remove the foreign material and measure the size of the damage from the inside to confirm whether it can be repaired.

2. Clean the surface around the internal wound to ensure that there is no secondary injury.

3. Use a low-speed grinder to cooperate with a rubber cutter to remove a large area of rubber around the wound.

4. When the steel wire is close to the carcass layer, use a low-speed grinder and a rubber brush for polishing. Moreover, when approaching the carcass layer steel wire, it is necessary to use the overcoat brush, because the use of the overcoat brush will not damage the carcass layer steel wire.

5. Separate the damaged steel wire and rubber with a cutter.

6. Use a high-speed grinding machine with a carbon steel cutting tool to remove the damaged steel wire. Experienced masters will be careful at this step to avoid expanding the scope of damage.

7. Use a high-speed grinding machine with a pen-shaped grinding stone to grind the loose steel wire tightly wrapped in rubber. After grinding with a grinding stone, you must use a low-speed grinder with a rod brush to remove the dead glue.

8. Sand the wound slope and extend the sanding to an area 15-20mm beyond the wound. The shape of the sanding wound is funnel-shaped, ensuring that the pressure roller can touch the bottom of the funnel.

9. Use a low-speed sander with a soft wire brush to clean and polish the surface.

10 Measure the total wound thickness value and record it in the sidewall position with a crayon.

11. Use a high-speed grinder with an alumina grinding ball to grind the slope from the inside of the wound, and extend the sanding range to an area 10mm beyond the wound.

12. Check the wound with a probe cone for delamination, tears, etc.

13. Clean the polished surface with a handle wire brush and a vacuum cleaner. Do not touch the polished surface with the head of the vacuum suction tube to avoid cross-contamination.

14. The length and width of the wound were measured from the inside of the wound and recorded to the lateral position with a crayon.

15. Mark the center of the wound with a crayon crosshair as a reference for the position of the tire on the point vulcanizer.

16. Apply hot vulcanizing agent evenly to the polished surface and wait for it to dry.

17. The film that needs to be filled in the wound is cut into strips and preheated on a hot plate.

18. Fill the heated rubber strip into the wound layer by layer with a pressing roller. The rubber used to fill the wound must be 3mm higher than the sidewall surface and the inner airtight layer surface.

19. Install the tire on the point vulcanizer and set the vulcanization time.

Time setting = preheating time (total thickness of filler over height) Xa min/mm

The preheat time and "a" value can be provided by the vulcanizer and raw material suppliers.

20. Check the state of the vulcanized rubber with a probe cone.

21. Select the appropriate patch according to the repair material selection table provided by the supplier, and polish the airtight layer to the RMA1-RMA2 after framing.

22. Use a low-speed sander with a soft wire brush to clean and polish the surface and use a vacuum cleaner to remove dust.

23. Apply the room temperature curing agent to the polished surface and wait for it to dry.

24. Partially remove the patch protective film and align the center of the patch with the center of the wound, noting that the bead expansion arms must be relaxed before the patch is applied.

25. Fit the patch on the wound. When placing the patch, the direction of the arrow on the patch surface must be perpendicular to the beads on both sides, I .e. parallel to the carcass layer wire.

26. Press the patch outward from the center to ensure that no air is contained.

27. Apply sealant to the edges of the patch

28. Grind the excess rubber on the outer surface of the tire to conform to the tire contour.