Month: Jan

Line: Line 1

Incident: US bad Tyres

Root causes: Mold temperature drop due to Steam leak on the steam inlet in mold top part. Action:  Steam inlet valve change.

Action: Steam inlet valve change.


Root causes: High T90 value of the compound. Action: Replace the compound pallet from correct compound properties


Line: Line 2

Incident: HT defect tyre

Root causes: Mold Tread parting line damage. Action: Mold repared

Action: Mold repared


Line: Line 3

Root causes: Venting hole block. Action: Cleared venting holes. Percentage of solving Problem: 0.7

Action: Cleared venting holes


Line: Line 4

Incident: Tread SM defect tyres

Root causes: Bumping cycle delay due to pressure drop

Action: Pressure increased


Incident: Inner Heel SM Defect Tyres

Root causes: Mold Core Damage

Action: No action


Root causes: Pre cured Inner heel due to high mill temperature

Action: Reduced mill temperature


Root causes: Low Inner heel core weight

Action: Increased the Inner heel core weight by increasing rolling turns.


Root causes: High Inner heel core Temperature

Action: Reduced mold core temperature


Line: Line 5

Incident: Lug burn Defect tyres

Root causes: Venting hole block due to flash accumilation

Action: Cleaned venting hole


Root causes: Steam leak to the mold due to mold jacket damage

Action: Mold jacked repaired.


Incident: Impurity Defect tyres

Root causes: Mold not clean properly

Action: Mold cleaning


Root causes: Cured Rubber particle in some venting holes

Action: Clean venting holes


Incident: Side wall burn tyres

Root causes: Venting hole block in side wall ring

Action: Venting hole cleaned


Incident: Shifted Tyres

Root causes: Mold shifted

Action: Mold Guiding prepared


Root causes: Mold Pin Damage

Action: Mold pin relpared


Root causes: Tyre Molding Delay

Action: Introduce system controller to block delayed molding tyres.


Incident: Low Hardness tyres

Root causes: Tyre under cure

Action: Introduce system controller to cutoff temperatue if cycle exceed  curing time.


Root causes: Compound viscosity Drop

Action: Change the pallet from correct viscosity one.


Incident: High hardness tyre

Root causes: Tyre Over cure due to high maold temperature

Action: Fix the alarm for temperature. If the temperature goes out of control alarm raised.


Incident: Tread SM tyres

Root causes: Scorch particles in the compound

Action: Replace the pallet from new one.


Incident: Ring out side defect tyres

Action: Increased the inner heel core weight in that particular sizes.


Incident: SM defect tyres

Root causes: Low finished tyre weight due to weighting Scale error

Action: Scale calibrated


Root causes: Low compound volume due to high S.G. of the compound.

Action: Replace the pallet from correct S.G. one


Incident: Essentricity bad tyres

Root causes: Mold core not alignment issue.

Action: Repair alaignment


Incident: Wrong Label tyres

Root causes: Un skilled operator put wrong label into the tyre

Action:
1. Scanning system implemented before place the lable.

2. Skill up operator by giving required training.


Incident: Lug SM defect tyres

Root causes: Bumping pressure released in main pressure line

Action: Pressure corrected in main pressure line.


Root causes: Mold Lug damage

Action: Lug repared.


Incident: Flash open defect tyres

Root causes: High compound volume

Action: Tyre weight adjusted


Root causes: Low tyre curing pressure

Action: Increased curing pressure


Root causes: Soft compound mixed with tread

Action: Introduce compound pallet scanning method to avoid this issue


Incident: Band damage tyres

Root causes: Band damage due to core tapering

Action: Core repared.