Oct 6, 2019
In order to determine the temperature on the wall of an injection mould, cavity temperature sensors specially designed for this application are used.
The reaction time of the sensors plays a major role here.
The aim is to be able to detect the position of the melt front in real time. The sensor thus functions as a kind of light barrier in the mold.
It can also be used to analyze the temperature profiles in the cavity.
With this, the sensors are used for monitoring, switching and closed loop controls within the injection molding process.
Quality: Two
cavity temperature sensors with different sizes.
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This glossary of plastic industry is provided by PLEXPERT Canada Inc.
Oct 6, 2019
Particularly important for the evaluation of the temperature on the mold surface is the knowledge about the temperature on the cavity
wall.
This temperature is called cavity wall temperature.
During continous production, the cavity wall temperature is higher than the mold temperature.
The reason for this is that the hot melt is in direct contact with the cavity wall during the injection time and heats up the cavity wall.
The temperature fluctuates during a cycle due to heating (injection phase) and cooling (cooling time).
The cavity wall temperature can be determined by special sensors mounted within the cavity wall.
Temperature control: The
mold surface
temperature measured in an 8-
cavity mold over time.
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Jan 5, 2019
A powder injection molding (PIM) process in which fine-powdered ceramic is mixed with a thermoplastic binder material to a moldable compound is called ceramic injection molding (CIM). This fine-powdered ceramic builds the so called feedstock. This feedstock can be processed with plastic injection molding. The plastic injection molding process allows competitive manufacturing of mid to high volumes and complexity in repeatable quality.
The molded part is debindered in a second process step. The thermoplastic binder material is removed from the compound.
In a third process step, the debindered part is sintered.
Densities of 99,95 % and higher can be obtained against compact material. Material and mechanical properties of final parts are comparable to the corresponding compact materials.
CIM is very cost competitive against standard multi stage cutting technologies like milling, drilling and grinding.
Best practice examples for CIM-processes: Ceramic grinders, textile industry, medical applications and many others.
May 31, 2019
The International Exhibition on Plastics and Rubber industries in China, called Chinaplas, is an exhibition from the organizer Adsale.
In 1983, it opened the doors for the first time in Guangzhou (China).
Since 2006, it has been approved by UFI (The Global Association of the Exhibition Industry).
Chinaplas runs every year for four days and has a significant world wide influence on the plastics and rubber industries.
It is the biggest fair for this industry in Asia and is held in yearly turns in Guangzhou and Shanghai.
General: Logo from
Chinaplas fair
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Interplastica
This glossary of plastic industry is provided by PLEXPERT Canada Inc.
Feb 1, 2022
This is a tolerance which is usually specified for cylindrical parts.
When rotating around a reference axis, the deviation of a measured value must not leave the tolerance field defined by two concentric circles.
The two concentric circles are perpendicular to the specified reference axis.
The distance between the two circles is described by the value given together with the sign for radial runout.
The tolerance described in this way is called radial runout.
During one revolution around the reference axis, the specified radial runout must not be exceeded.
In addition, the tolerance zone can be defined by two parallel planes.
These are perpendicular to a specified reference axis and have the specified distance to each other.
In this case, the tolerance is also called axial axial runout.
During one revolution around the reference axis, the axial runout must not be exceeded.
Quality Assurance: Measured values in the toleranced range must lie within the concentric circles at a distance of 0.2mm
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This glossary of plastic industry is provided by PLEXPERT Canada Inc.
