Extrusion Machinery

Extrusion machinery computerised automatic transmission system... 

The Web Watch directory, an online search engine of plastics industry-relevant websites, allows users to select from approximately sixty descriptions of companies or organizations (such as associations, blow molders, extrusion machinery suppliers, compounders, consultants, and so on). When searching for a certain type of processor, users can filter further by choosing the type of end market served (such as injection molders and medical). The search-results pages provide links directly to the sites that match your search parameters. Inclusion in and use of the Web Watch directory is free. 

Blown film processors should be knowledgeable about the ways in which additives may affect the processing of plastics. For example, some additives are designed to aid processing by reducing viscosity while others may have a detrimental effect on extrusion machinery by causing considerable wear. The following sections describe various additives used with blown film extrusion polymers. 

In order not to duplicate other texts on extrusion, this book will emphasize new trends and developments in extrusion machinery. The extrusion theory will be covered as completely as possible however, the mathematical complexity will be kept to a minimum. This Is done to enhance the ease of applying theory to practical cases and to make the book accessible to a larger number of people. A significant amount of attention will be paid to practical application of the extrusion theory to screw and die design and solving extrusion problems. After all, practical applications are most important to practicing polymer process engineers or chemists. 

Table 3.1 summarizes the functional requirements for drives used in extrusion machinery. This comparison is based on a paper by Kramer [32]. 

Table 3.1 Functional Requirement for Drives Used in Extrusion Machinery [32]...

The equipment used for melt making is not completely linked to extrusion machinery, since the used melt viscosity in this process is low compared to other spinning processes, in the range of less than 100 pa, eg, PP is used in an MFR rage of 125—3000 (230/2.16). Resins used in the melt blown process are characterized by the already mentioned low viscosity and still some elastic properties in order to be able to spin into filaments. There are no restrictions, so polyolefins, polyesters, polyamides and polyurethanes, as well as bitumen or cellulosic solutions, are possible to process via the melt blown process into filaments. Even high melting point polymers such as Polyphenylensulfid (PPS), Polysulfon (PSU) or even Polyetheretherketon... 

Over the years, PVC pipe extrusion machinery and materials became more sophisticated. As a result, inadequate fusion occurred infiequently and ilure rates of acetone tests dropped to near zero. Manufacturers also realized that other quality tests (such as impact and flattening tests) were identifying the occasional fusion problem that did occur. 

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