Dec 9, 2021
or also called line profile, is a form tolerance and describes a tolerance zone which is limited by two curves (envelope lines or envelope curves).
This tolerance defines how the curvature of a part must be designed.
The measured profile line must lie at every point across the thickness of the molded part between the envelope lines running at the given distance.
The distance between the two equidistant enveloping lines is formed by circles with the specified diameter.
The centers of the circles lie on the shape specified as geometrically ideal.
Quality assurance: Profile shape line
tolerance with enveloping lines at the distance of a circle diameter of 0.09mm
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This glossary of plastic industry is provided by PLEXPERT Canada Inc.
Dec 14, 2021
This term refers to a tolerance zone which is bounded by two curves.
The area tolerated as the profile forming area must lie between two equidistant enveloping surfaces.
The spacing of these enveloping surfaces is formed by imaginary spheres with the diameter of the specified value, encompassing the entire specified curvature.
Quality assurance: Tolerated surface profile with representation of the enveloping surfaces
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Profile of a line
This glossary of plastic industry is provided by PLEXPERT Canada Inc.
Sep 22, 2019
The polymerisation of styrene produces the transparent thermoplastic polystyrene (PS).
Polystyrene is crystal clear, hard and impact sensitive in the solid, amorphous form.
As foam (e.g. styrofoam) the material is white and opaque. In this state its strength is lower, but the elasticity is higher.
The foam is often used as packaging material, filler or as insulating material for buildings.
Polystyrene shrinks little during production, so it is preferred for fine contours and straight surfaces in accurate fitting components. For food packaging, shower walls or signs PS is commonly used.
Plastic: Paper trays made out of
polystyrene (
PS).
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This glossary of plastic industry is provided by PLEXPERT Canada Inc.
Aug 5, 2019
The task of a cooling device is to deliver coolant with a given temperature and a given flow rate into a cooling system.
Within each cooling channel there is a pressure drop. The pressure drop depends not only on the flow rate.
Furthermore length and geometry of the cooling system play an important role in the occurring pressure.
The pump curve shows the maximum flow rate at a given pressure rate.
If the pressure drop in the cooling channel is higher than suggested in the pump curve, the flow rate will drop.
As actual value the flow rate is shown, which is the maximal possible for the given pressure.
In this case the cooling channel needs to be adjusted or another cooling device should be used.
Oct 21, 2019
The polymerization of the monomer vinyl chloride produces the amorphous thermoplastic polyvinyl chloride (PVC).
PVC is hard and brittle. Therefore it is also called rigid PVC.
Its abbreviation is PVC-U, where U stands for the word “unplasticized”.
Rigid PVC is for example used for pipes, window profiles and records.
Plasticizers provide PVC with elasticity. Therefore it is called soft PVC.
Its abbreviation is PVC-P, where P stands for the word “plasticized”.
A common use of soft PVC is cable sheathing and flooring.
PVC is very durable. Environmental influences, such as sun, sea water and air can hardly harm the material.
Image 1:Plastic: Cable sheathing made of PVC.
Image 2:Floor covering made from PVC
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This glossary of plastic industry is provided by PLEXPERT Canada Inc.
