New test method identifies gas formation during injection molding


A new test method that identifies gas formation during the injection molding process helps reduce mold deposits, according to engineering thermoplastics supplier Polyplastics Co. Ltd. The Tokyo-based company’s gas investigation method in injection molding (GIMIM) is said to facilitate continuous molding and improve production. Efficiency.

During the injection molding process, high temperatures and speeds as well as deterioration of plastic additives can release high volumes of decomposition gases. Mold deposits, gas burns and short shots caused by pyrolysis gas can cause quality problems. These can include undesirable effects on the dimensions and appearance of molded parts, resulting in high defect rates. Maintaining efficient production operations is important as manufacturers strive to meet challenging applications such as automotive electrification and automation, Polyplastics said in its announcement.

The company’s proprietary technology captures and evaluates gases formed during molding and identifies the mechanism by which pyrolysis gas is formed during injection molding. It traps gases using mold-based methods and uses gas chromatography (GC / MS) mass spectrometers to qualitatively and quantitatively analyze their composition, identify the gases that form, and make fundamental improvements to their sources. training.

The system setup is divided into three stages of plasticizing, dosing and injection, and each unit is fitted with traps to separate the gases that form in each part of the process.

GIMIM allows the measurement of high molecular weight substances that can cause mold deposits. Because this method directly analyzes the gases that form inside the mold during filling, it gives results that are closest to actual conditions, according to Polyplastics. In further research, Polyplastics plans to examine other problems caused by pyrolysis gases, such as short shots and flaws in the gas as well as mold deposits.

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