Application of Calendered Sheet

Lining sequence for each kind of vessel and piping should be planned ahead and the development of sheet to match the contours 

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Sulfonated EPDMs are formulated to form a number of rubbery products including adhesives for footwear, garden hoses, and in the formation of calendered sheets. Perfluori-nated ionomers marketed as Nation (DuPont) are used for membrane applications including chemical-processing separations, spent-acid regeneration, electrochemical fuel cells, ion-selective separations, electrodialysis, and in the production of chlorine. It is also employed as a solid -state catalyst in chemical synthesis and processing. lonomers are also used in blends with other polymers. 

Parison n. The hollow tube or other preformed shape of molten thermoplastic that is inflated inside the mold in the process of blow molding. Most commonly, the parison is extruded immediately before blowing, but parisons are also injection molded and may also be chilled and stored, to be reheated before blowing. In the earliest application of blow molding, a pair of calendered sheets joined along the edges was used as the parison. 

Ceca markets two tin-based stabilisers, Thermolite 190 and 191, for rigid PVC applications, including calendered sheets in packaging and blister packs, extruded and blow-moulded containers, bottles and injected articles. They need a lower dose than other types of tin mercaptan. 

The main applications for CPVC arise from the fact that the material has a softening point of about 100% and very good chemical resistance. Particular interest has been shown in waste and soil systems which may pass hot water effluents. Calendered sheet may be vacuum formed for uses where hot filling techniques are employed, for example in jam packing. 

A process for making hollow mbber articles from a single sheet of calendered unvulcanised mbber. The surface of the sheet is semi-vulcanised and the application of a swelling agent causes the sheet to split thus forming the hollow article, the vulcanisation of which is completed thereafter. Homo polymer... 

In a calender line, the polymer melt is transformed into films and sheets by squeezing it between pairs of co-rotating high-precision rollers. Calenders are also used to produce certain surface textures which may be required for different applications. Today, calendering lines are used to manufacture PVC sheet, floor covering, rubber sheet, and rubber tires. They are also used to texture or emboss surfaces. When producing PVC sheet and film, calender... 

The most widely plasticized polymer is polyvinyl chloride (PVC) due to its excellent plasticizer compatibility characteristics. Only by incorporation of a plasticizer a degree of flexibility is achieved, which makes PVC suitable for applications such as cable insulation or sheathing, calendered sheets, floor covering, flexible profile or synthetic leather. However, plasticizers have also been used and remain in use with other polymer types. 

For piping, the minimum thickness of 3 mm is satisfactory. The maximum single ply thickness recommended for application is 5 mm and all thicknesses more than 5 mm should be in two or more plies having a maximum thickness per ply of 4 mm. While the thickness specification is for application of lining, the calendering sheet thickness standard used is 1 mm, which is doubled with several plies of 1 mm to obtain the required lining thickness, to ensure pinhole free sheet. 

Other Applications. The phosphonium ionomer from the Exxpro elastomer can be formulated into a wide variety of compounds of interest in applications such as calendered sheet, garden hose, footwear, membranes and packaging materials. 

PVC applications of polymeric ester plasticisers include food wrap, calendered sheet, electrical tape, industrial gloves, protective clothing and roofing materials. Polymeric ester plasticisers are biodegradable, and short life products can be made that degrade in around four weeks under the right conditions. 

The larger part of EPM and EPDM mbber finds applications in continuous extruded profiles or calendered sheets for automotive and building sealing applications. A smaller part is being used for a diversity of applications, from molded goods till viscosity modifiers for lubricant oils. The processing of EPM and EPDM rubbers must be viewed in relationship to the sort of application envisaged. 

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