Analysis of the causes of bubbles in injection molding products

The analysis of bubbles in injection molded products often involves identifying the cause of gas entrapment, particularly vacuum bubbles. These bubbles are typically thin and occur due to a lack of proper filling or low pressure during the molding process. When a bubble is observed at the moment of mold opening, it usually indicates a gas-related issue. Vacuum bubbles form when the molten material doesn’t completely fill the cavity, leading to localized shrinkage as the material cools rapidly. This shrinkage can create voids or cavities, especially in thick sections or corners of the part. To address this problem, several solutions can be implemented: 1. **Increase Injection Energy**: Enhance the injection pressure, speed, holding time, and shot size. Raising the back pressure can help ensure better material packing and reduce the chances of underfilling. 2. **Adjust Temperature Settings**: Optimize the melt temperature to improve flowability. Lowering the material temperature can help reduce shrinkage, while increasing the mold temperature—especially in areas where the bubble occurs—can promote even cooling and minimize void formation. 3. **Improve Gate Placement**: Position the gate in thicker areas of the part to enhance material flow through the runner and gate system. This helps reduce pressure loss and ensures more uniform filling of the cavity. 4. **Enhance Mold Venting**: Ensure that the mold has adequate venting to allow trapped air to escape. Poor venting can contribute to gas entrapment and bubble formation. By addressing these factors, manufacturers can significantly reduce the occurrence of vacuum bubbles in injection-molded parts, improving product quality and reducing defects. For more information on injection molding techniques and troubleshooting, feel free to contact us at hotline 13711965595. Source: http://news.chinawj.com.cn Edited by Hardware Business Network Information Center.

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Operating Environment

Atmospheric pressure: 85kPa~106kPa

Ambient temp.: Refer to Chapter 1.6

Relative humidity: 5%~95%, non condensing


Operating conditions

Fluid: Liquid/Gas
Fluid temperature: -200°C~+200°C (higher temp. model is customizable)

Nominal pressure: 4MPa or 25MPa (Customizable)

Supply voltage: AC 85~265VAC, 50/60Hz or DC 12~24VDC(±5%), 5W

Outputs: Pulse 0~10KHz, RS-485, 4-20mA & HART (optional)


The meter consists of mass flow sensor and transmitter. Mass flow sensor is a phase-sensitive resonant sensor based on Coriolis effect, composed of vibration tube, signal detector, concussion driver, structural support, shell, etc.

Mass flow transmitter is a micro-programming-centered electronic system, which supplies thrust to sensor, transforms sensor signal into mass flow signal & others, and improves accuracy in accordance with temperature parameter.
It`s composed of switching power supplier, guard grating, core processor board, display module, etc., installed in a ex-proof junction box. Switching power supply offers power for transmitter; safe grating isolates sensor and transmitter intrinsically; core processor detects & processes sensor phase signal, sends mass flow signal and process communication.



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