May 25, 2021
Plastics can absorb varying amounts of moisture during storage. Depending on the plastic used, the degree of moisture must be measured before production and reduced by drying if necessary.
If a sample is heated by means of infrared radiation when measuring residual moisture, this is referred to as infrared residual moisture measurement.
The measuring principle is as follows:
A sample is heated by infrared rays. This evaporates the moisture from the plastic. By checking the weight with a precision scale built into the measuring device, the difference in weight before and after drying is determined.
This result corresponds to the moisture content in %.
Quality assurance: Infrared
residual moisture measuring device in use
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This glossary of plastic industry is provided by PLEXPERT Canada Inc.
Dec 7, 2018
The display of the injection molding process in the theory is called injection molding simulation.
In the early development of a project, it is used to check and optimize geometry, process and mold.
This way, different versions can be tested at low costs in order to use the best version for the mold.
The optimization of the process during simulation helps to use less materials for the trials and saves time.
Also for the error analysis, the injection molding simulation can be used to find the parameters with the most influence, for example with the help of a DoE.
Feb 15, 2019
After the injection molding process, defects can be visible on the produced plastic part.
Causes of the most common defects in injection molding where analyzed and grouped by several German institutes.
Based on this research, solutions for each defect are described and summarized in the software InMold Solver.
With the intraweb based software comes a database that allows to add new defects and solutions.
Today the software is available in its version 1.22, in English, German and Thai, to support setters and quality managers, in order to find fast solutions to eliminate defects on plastic parts.
Feb 18, 2025
After the mold is built it must be checked whether the cooling system of a mold is sealed and working properly. This test is called Leak tightness test. The temperature control circuit is examined for leaks to ensure that no cooling fluid escapes and that heat transfer remains efficient. Common testing methods include pressure testing with air or water as well as leak detection using specialized test fluids. Leaky temperature control circuits can lead to uneven cooling, increased scrap rates, and production disruptions. Regular leak tightness tests help prevent mold damage and ensure consistent part quality. Especially in high-precision applications, flawless temperature control is crucial for maintaining dimensional accuracy in injection-molded parts.
Quality:
Leak test of a circuit with hand pump
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This glossary of plastic industry is provided by PLEXPERT Canada Inc.
Nov 16, 2018
During the injection molding process, molten plastic is compelled to fill a feeding system and cavity inside the mold. The melt front shows how molten plastic moves inside the mold over time.
The knowledge about this movement helps to evaluate the filling of the mold.
It shows air traps and weld lines for example.
Quality: The change from one color to the next one shown the
Melt front at one timestep.
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This glossary of plastic industry is provided by PLEXPERT Canada Inc.
