In the extrusion of pipes, cables, profiles and many other semi-finished products, immersion cooling tanks or spray cooling tanks are used in which the hot extrudate is introduced and cooled with cooled water. Both the immersion cooling tank – in which the extrudate is completely submerged in a water bath […]
Material Knowledge
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Every optimization, regardless of whether it is a technological, process engineering or a organizational measure, usually requires an adaptation of behavior patterns. Adapting behaviour patterns, especially when the behaviour to be changed has been practised for years, is often not easy and in many cases represents a hurdle, the overcoming […]
The processing behavior and the achievable product properties of plastics can change enormously depending on the residual moisture content of the polymer raw material. In most cases, too high residual moisture leads to problems, but in some cases quality problems or processing problems also occur due to too low residual […]
In plastics processing, quality problems are often caused by the presence of angel hair, impurities or dust. Angel hair can be recognized as very fine, hair-like plastic threads that can be formed during material transport. Dusts are fine solid particles of different sizes and can be made of plastic, but […]
In addition to the width of a film and the profile tolerance, the flatness is considered as one of the most important quality criterions. Good flatness refers to film products with a high planarity, also a low tendency for sagging areas or bulges. The flatness of a film is an […]
Voids/blowholes/vacuoles are frequent quality problems that can occur especially in the manufacture of thick-walled products. Although the cause of this problem is well known, it is often difficult and time-consuming to avoid it. When cooling plastics from melt temperature to ambient temperature, the specific volume or density of the plastic […]
In the processing of plastic, additives offer the possibility of changing the properties of polymers and adapting them to a corresponding task. A distinction is made between additives that have an influence on the process ability of the plastic and additives that have an influence on the product properties. Frequently […]
Collapsing of pipe ends is one of the most common problems in the extrusion of pipes and occurs especially when high production speeds areused on the production lines. The reasons for the geometric shape deformations are internal stresses. The reduction of the problem is often possible with simple means. […]