Jan 8, 2019
Metal Injection Molding is A PIM-process in which fine-powdered metal is mixed with a thermoplastic plastic binder material to a Compound is called metal injection molding. The fine-powdered metals are the feedstock. This feedstock can be processed with plastic injection molding. The plastic injection molding process allows competitive manufacturing of mid to high volumes and mid to high complex part designs.
In a second process step, the molded part is debindered – the thermoplastic binder is removed from the feedstock.
In a third process step, the debindered part is sintered.
Densities of 99,95 % and higher against compact virgin material can be obtained.
Material- and mechanical properties of final processed parts are mostly comparable to the corresponding compact, solid materials.
MIM is very cost competitive against standard multi stage cutting technologies like milling, drilling, grinding, etc.
Best practice examples for MIM-processes: Stainless steel watch-housings, aerospace, textile industry, medical applications and many others.
Oct 12, 2019
There is no clear line between conventional injection molding and micro injection molding.
However, it is common to use the therm micro injection molding when parts being produced starting from 0,001g ( 1 Microgram) up to 0,4g per cavity.
The dimensions of the parts ranging mostly between a few millimeter and one micrometer.
The demand on the part precision is very high.
If cold runner molds are used for micro injection molding the shot weight is defined up to 97% by the cold runner itself.
From the production side machines with screw diameters down to 12mm are available as well as machines using a piston in order to inject the melt.
Cycle times in micro injection molding are obviously very short.
Sep 24, 2020
A length measuring device consisting of a fixed and a movable measuring surface, which is adjustable with a fine thread, is called a micrometer screw.
The measuring sample is held against one of the two parallel measuring surfaces and the thread is turned up or down by an adjusting screw until both measuring surfaces touch
the testing sample.
The thread is turned by means of a ratchet in order to avoid falsified measured values due to different measuring forces.
If the measuring force is too high deformation of the testing sample or the micrometer can happen.
The occurring measuring forces should be constant and reproducible. The ideal measuring force is between 5 and 10 Newton [N].
The roundness of a testing sample cannot be measured with a micrometer screw.
Almost all micrometers are equipped with plastic handles or shells for insulation.
In order to obtain optimum measuring results, the micrometer must be held on this sheathing.
Otherwise, the surfaces held in place may expand due to the body heat and falsify the measurement result.
The room temperature for the most accurate possible measurements is 20 °C.
There are analogue micrometers as well as those with an additional digital display of the measured values.
Different micrometers are required for internal, external and depth measurements or for measurements on gear flanks.
Depending on the requirements, micrometers can be tested internally by the quality assurance department or
by external certified calibration laboratories, as well as by the respective manufacturer using linear standards, gauge blocks or setting rings and plane-parallel test glasses.
Measuring Technology: Depth
Micrometer for depth measuring
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This glossary of plastic industry is provided by PLEXPERT Canada Inc.
Feb 11, 2019
Worldwide (as of 2018) around 400 million tons of plastic are processed each year.
During and after the use of a plastic part, it can get fragmented due to different effects. From larger plastic parts, small pieces of plastic arise.
If the size of these particles is in between 5 millimeter and one micrometer (0,001 mm), the particles are called microplastic.
Continuing the decomposing process smaller parts arise.
If the size lies between one micrometer and 100 nanometer (0,0001 mm) they are called sub-microplastic.
Below a size of 100 nanometer the particles are called nano plastics.
In how far microplastics affect people and the environment is an important issue and is being intensively researched.
Plastic:
Microplastic on a finger tip.
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This glossary of plastic industry is provided by PLEXPERT Canada Inc.
Sep 24, 2020
The composition of a mixture is determined via the so-called mixing ratio. It indicates how many parts or % by weight of two or more components are mixed. The mixing ratio is mandatory and can only be achieved by an exact weighing with a digital scale.
Different mixing ratios, for example in polyurethane foams, have a significant influence on the properties of the final product.
Measuring technology: Weighing of the
mixing ratio between
masterbatch and basic material.
Related topics:
Xscale
This glossary of plastic industry is provided by PLEXPERT Canada Inc.
