In the production process of injection molded products, the bubble problem often causes headaches for manufacturers. These small bubbles not only affect the appearance of the product, but may also cause its strength to decrease, thus affecting the overall quality of the product. So, how do bubbles occur?
The main reasons for the generation of bubbles
- Water content in raw materials:
The moisture in the plastic raw materials has not been completely removed. When heated and melted, it will evaporate to form water vapor, and then form bubbles in the product. This is the most common cause of bubble problems, especially for highly hygroscopic materials such as nylon (PA) and polycarbonate (PC).
- Improper injection molding process parameters:
Too low injection molding temperature or insufficient pressure will cause poor fluidity of the plastic melt, which is easy to wrap air and form bubbles. If the injection molding speed is too fast, the gas in the melt will not be discharged in time, which will also cause bubbles.
- Mold design defects:
Poor internal exhaust of the mold or uneven surface temperature may also cause air to be unable to be discharged, thereby generating bubbles.
- Material fluidity problem:
Materials with poor fluidity or high viscosity are prone to trap air when filling the mold, resulting in bubbles.
Technology support: How to solve the bubble problem with advanced equipment
After understanding the causes of bubbles, many manufacturers will think, is there an effective way to solve this problem? The answer is yes. Through scientific equipment and process optimization, the bubble problem can be significantly reduced. Here, Injection molding plastic dehumidifier dryers and mold temperature controllers play a key role.
- The role of plastic dehumidifier dryers
In order to completely solve the problem of raw material moisture, it is essential to use an efficient plastic dehumidifier dryer. It can ensure that the plastic raw materials have been fully dried before entering the injection molding machine, so that even materials with strong hygroscopicity can avoid water vapor during the melting process and reduce the formation of bubbles.
- Precise control of mold temperature controller
Precise control of mold temperature is equally important. The mold temperature controller adjusts the temperature of the mold to ensure uniform surface temperature of the mold, which can not only improve the fluidity of the material, but also prevent the bubble problem caused by uneven cooling. In this way, not only the yield rate can be improved, but also the production efficiency will be greatly improved.
Summary
Facing the bubble problem in injection molded products, starting from the root cause, combined with advanced plastic dehumidifier dryers and mold temperature controllers, can significantly improve product quality and reduce scrap rates. For companies that want to stand out in the market, such an investment is undoubtedly worthwhile. Technology helps production, so that every injection molded product can meet high standards. This is the direction of future manufacturing.
