भाषा चयन गर्नुहोस् 
In rubber manufacturing, both vulcanized rubber parts and non-vulcanized rubber parts commonly face technical chसबैenges such as mold sticking, roller sticking, and air bubbles.
The following is a complete केस analysis and systematic improvement plan, applicable to rubber rollers, rubber sheets, seals, and most general rubber पानी.
1. Background: Material Changes Causing Severe Mold Sticking & Air Bubbles
After raw material adjustments, the परिणामion experienced severe mold sticking, trapped air, and unstable processing:
Reclaimed rubber: low rubber सन्तुष्ट → high rubber सन्तुष्ट (viscosity increased)
Rubber powder: coarse powder (10 mesh) → fine powder (40 mesh)
Result: higher toughness, tighter bonding, significantly reduced venting performance
Original Formula
NR: 4 kg
SBR: 4 kg
Reclaimed rubber: 19 kg
Rubber powder: 6 kg
The पूर्ववर्ती formula (cheap reclaimed rubber + coarse powder) had no mold sticking issues, but after upgrading materials, the problem amplified significantly — a common situation during vulcanized rubber part परिणामion.
2. Technical Cause Analysis: Why Mold Sticking and Air Bubbles Occurred
1) Increased intrinsic tackiness of materials
Higher-rubber-सन्तुष्ट reclaimed rubber behaves closer to virgin rubber →
More active molecular structure → Significantly higher mold adhesion.
2) Rubber powder changed from coarse (10 mesh) to fine (40 mesh)
Fine powder binds more tightly into the compound:
Higher cohesion
More compact structure
Much poorer air release → severe air trapping
3) Compound became overly dense and tight
Dense compounds easily cause air traps, scorching, and sticking during vulcanization.
3. Feasible Improvement Measures (Field-Verified Results)
समाधान 1: Increase ratio of coarse rubber powder (improve venting)
From 50 phr → 100 phr
Result: Air bubble rate improved from 100% → 30%.
Coarse powder loosens the compound structure, improving air escape — especiसबैy helpful for non-vulcanized processing.
समाधान 2: Use mold release agent (critical step)
The factory पूर्ववर्तीly used no release agent at सबै (high-risk practice).
After applying release agent:
Bubble rate: 30% → 15%
Release agents are standard for producing vulcanized rubber parts.
समाधान 3: Mold surface treatment (key factor)
Original mold: no plating / no PTFE / no polishing → extremely prone to sticking.
सुझाव गर्ने treatments:
PTFE (Teflon) coating
Chromium plating
Polishing to low surface roughness
Smoother molds = dramaticसबैy less sticking.
समाधान 4: Adjust compound looseness
If the compound is too sticky/dense:
Increase stearic acid / paraffin (your 2.5 / 1.5 phr is normal but can be adjusted)
Add large-pलेख fillers to open the structure
Reduce density by increasing coarse rubber powder
Your final changes (adding 80 phr coarse powder + release agent)
→ Fully resolved mold sticking issue.
4. Four Core Causes of Mold Sticking (Summary)
This केस had four simultaneous issues, which is why sticking was so severe:
Material tackiness increased significantly
Mold had no surface treatment
No release agent used during परिणामion
Compound became too dense → poor venting
When several of these occur together, mold sticking in vulcanized rubber parts becomes inevitable.
5. Final Recommendations (Applicable to सबै Rubber Factories)
1. Perform proper mold surface treatment
PTFE coating
Chromium plating
Regular cleaning & polishing
2. Use release agent for every batch
Especiसबैy critical for vulcanized rubber parts.
3. Adjust compound consistency when tackiness is too high
Increase fatty acids / wax
Add coarse powder to reduce density
Introduce large-pलेख fillers if needed
4. Looser compounds = better venting
This is essential for molds with deep grooves or poor vent paths.
In rubber manufacturing, both vulcanized rubber parts and non-vulcanized rubber parts commonly face technical chसबैenges such as mold sticking, roller sticking, and air bubbles.
