Dec 9, 2021
This geometric tolerance describes the radial deviation of a target feature when the target is rotated around an axis or straight line.
The specification of a reference point is always required.
A distinction is made between total runout (radial) and total runout (axial):
Total runout (radial) = total runout tolerance.
In this case, the tolerance zone is limited by two coaxial cylinders which are at a specified distance from each other and parallel to the specified reference axis.
Total runout (axial) = Total axial runout tolerance
Two parallel planes at a given distance from each other and perpendicular to the reference axis form the tolerance zone.
Quality Assurance: The shell surface has to be between two cylinders with radial distance 0.2mm
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This glossary of plastic industry is provided by PLEXPERT Canada Inc.
Nov 5, 2018
In the measuring technology a trigger designates a triggering event or an impulse. In combination with pressure sensors in a mold e.g. start of injection is needed as a trigger signal. With this the pressure curve for one cycle will be recorded. Regarding quality control with IR-ThermalSystem the trigger signal will be given using a limit switch as soon as the mold is completely open.
Jan 11, 2019
A geometrical difference between target and actual geometry is called warpage.
In the plastic industry this is caused by the developing stresses during the process.
Stresses arise due to the different shrinkage degrees in the part.
Varying Cooling rates, Orientation of the molecules, in-mold constraints (limitations for the shrinkage), uneven wall thickness/packing pressure are responsible for the differences.
These effects can cancel each other out or enhance one another.
Dec 27, 2018
In contrast to the automatically generated report, the Xpertise looks at every simulation result in detail.
This contains comprehensive explanations and suggestions for optimization, as well as DFM Analysis of the part.
Therefore everybody even without special knowledge understands what to do next in the development of the plastic part.
For best quality and high security guarantees the four-eye-system, where at least two experts discuss the results.
Dec 27, 2018
Sharing knowledge on different topics from the plastic industry is done with the Xpress.
The technical oriented newsletter is published by PLEXPERT on a regular basis.
Each time the focus lies on one specific topic, that will be discussed in up to three pages.
It is a good source to follow the actual development in the industry.
