During extrusion, the plastic is heated from the ambient temperature level to an elevated temperature level (usually >180 °C) so that the materials melts and becomes plastically deformable. After forming the product (film, tube, profile, rod, etc.), the product is cooled down to ambient temperature to achieve dimensional stability. Thus, […]
Basics
33 posts
In extrusion, the temperature distribution inside the product is a very relevant value whose knowledge can contribute to understanding a variety of effects or problems. However, measuring the internal temperature of an extruded product is difficult in most cases, because in a continuous process such as extrusion (with sometimes very […]
Plastics – material of the 21st century Plastics belong to the group of polymers. A polymer is an organic material and consists for the most part of carbon and hydrogen. Polymers are big molecules that have the shape of a chain (chain molecule) in which a great many identical subunits […]
In different extrusion processes, curvature (or bowing, sabre-running, katana effect, etc.) represents a major quality problem and is often difficult to get a grip on. The cause of the curvature is almost always an inhomogeneous thermal situation of the product during cooling and can often be greatly reduced or completely […]
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 […]
The collapsing of pipe ends is one of the most common problems in the extrusion of pipes and occurs especially when high production speeds are used on the production lines. The reasons for the geometric shape deformation are internal stresses. The reduction of the problem is often possible with simple […]
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. […]
Different extrusion tool concepts can be used for the extrusion of rotationally symmetrical semi-finished product geometries (e.g. pipes, hoses, jackets, blown films, blow molds). Typical applications are the use of spiderleg dies, screenpack dies, heart curve but also the use of spiral mandrel distributors. From a price point of view, […]