In the refrigerator manufacturing process, mold release jamming is a frequent but easily overlooked problem. It not only affects production efficiency, but may also damage the mold or cause product defects, increasing maintenance and rework costs.
This article will systematically analyze the common causes and prevention methods of demoulding jamming from three aspects: mold structure design, operation process control and daily maintenance, to help the production line run stably and improve product yield.
1. Mold structure optimization: reduce the risk of mold jamming from the source
Reasonable design of demoulding slope
The mold cavity should be set with an appropriate demoulding angle (generally ≥1.5°) to avoid excessive friction resistance caused by the straight wall structure.
Guide structure helps smooth demoulding
The introduction of auxiliary structures such as guide pins, guide sleeves, and limit blocks can prevent jamming caused by demoulding deviation.
Improve mold surface finish
If the inner wall of the mold is rough or has residual glue or material, it will increase the adhesion. It is recommended to polish the inner wall of the mold (Ra value ≤ 0.8μm) or use anti-stick coating.
2. Operation process control: master the correct demoulding time and method
Reasonable control of demoulding timing
If demolding is too early, the foam will not fully rebound and will easily stick to the mold; if demolding is too late, the internal cooling and shrinkage will make it tighter.
It is recommended to let it stand for about 30 seconds before demolding to allow it to loosen naturally with the help of the temperature difference between the mold and the environment.
Correct demoulding action
Avoid violent knocking or prying of the mold. Use both hands to slowly pry the mold apart from both sides symmetrically , and use the material’s resilience to complete demoulding to prevent the mold from deforming or damaging the edges and corners of the product.
Use lubricant or hydration
Before demolding, lightly spray a layer of water or a special mold release agent on the surface of the back panel to reduce the interface friction coefficient and improve the smoothness of demolding.
3. Daily maintenance of molds: Stable production is inseparable from daily maintenance
- Thoroughly clean residual foam, dust and impurities after each use to avoid long-term accumulation and formation of stuck points
- Regularly check the mold slider, guide parts and bolts for looseness, damage or wear, and replace them in time
- If sticking is found frequently, it should be evaluated whether re-polishing or coating repair is needed.
- برای molds that have been used more than 50,000 times , including bevel accuracy, guide rail lubrication condition, etc.
Summary: Smooth demoulding starts with details
Question Category | Specific manifestations | Suggested Actions |
Mold design issues | Demolding is difficult and often stuck | Optimize bevel/guide structure and improve finish |
Operational issues | Forceful demoulding damages the corners of the product | Control demoulding timing and action specifications |
Environmental/lubrication issues | The more you use the mold, the more it “bites” | Use lubricants, moisture, and temperature differences to assist demoulding |
Insufficient daily maintenance | Mold wear/impurity accumulation causes jamming | Establish a cleaning and maintenance mechanism, and conduct regular inspections and updates |
Through scientific design, standardized operation procedures and good maintenance system, the problem of refrigerator mold jamming can be completely prevented and controlled. If you have mold optimization needs or equipment problems, please contact us for professional diagnosis and customized solutions.