Blown Film Extrusion: An Introduction by Kirk Cantor

By Kirk Cantor

From and fabrics via processing and homes, a large assurance of blown movie extrusion is gifted. a prime target of this e-book is to make sure an invaluable stability of thought and perform. The reader will locate the solutions to "Why?" they stumble upon sure results within the blown movie technique so they are higher in a position to troubleshoot and increase their operations. whilst, present practices and gear are emphasised to maintain readers updated with the best and effective expertise.

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Additional resources for Blown Film Extrusion: An Introduction

Example text

Although the majority of single screw extruders do not employ venting, many extruders do. Gases need to be removed prior to the die when they produce defects in the extrudate. The most common defect caused by gas is foaming. Of course, foamed extrusions are often produced by design, but when foaming is unwanted, the gas must be removed before the die. Defects also take the form of bubbles and surface roughness. Unwanted gas may be present in the polymer due to a variety of reasons. Moisture that has turned into steam is a common cause.

2 Extrusion Functional Zones This section describes the six zones along the extruder in which various system functions are performed. Understanding the functional zones combines knowledge of polymeric materials with knowledge of extrusion hardware. , melting, mixing, pumping) that contribute to the final extruded product. If any one of these functions is performed improperly, quality of the final product or efficiency of the extrusion process may suffer. Put another way, to optimize extruder throughput, each functional zone must perform optimally.

Factors that may increase internal and external friction include rough surfaces, poor hopper design, moisture, heat, and static electricity. Therefore, the degree to which solids flow freely depends on both the material and the hopper design. Under proper conditions, solids move in plug (mass) flow, where the first in the top are the first out the bottom, and no mixing takes place. Problems, however, can occur with poorly flowing materials. Bridging (arching) is when a natural bridge forms at the base of the hopper, blocking further flow.

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Blown Film Extrusion: An Introduction by Kirk Cantor
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