Thermoplastics film extrusion

Cross-file patent searches, 18 243-244 CrossFire Beilstein, 6 19 Cross-flow filtration, 11 383 15 827, 829 in porous pipes, 11 387-388 with rotating elements, 11 383-387 Cross flow model, 21 706 Cross-flow packed scrubber, 26 687-688 Crossflow plates, 6 762-763 Cross-flow screens, 22 282 Cross-flow velocity, 15 725 Crosshead mandrel, in VDC film extrusion, 25 732-733 Cross-lapping, 17 501 Cross-linkable epoxy thermoplastic system (CET), 10 436... 

Thermoplasticity. High molecular weight poly(ethylene oxide) can be molded, extruded, or calendered by means of conventional thermoplastic processing equipment (13). Films of poly (ethylene oxide) can be produced by the blown-film extrusion process and, in addition to complete water solubility, have the typical physical properties shown in Table 3. Films of poly(ethylene oxide) tend to orient under stress, resulting in high strength in the draw direction. The physical properties, melting behavior, and crystallinity of drawn films have been studied by several researchers (14—17). 

THV Fluoroplastic can be processed by virtually any method used generally for thermoplastics, including extrusion, coextrusion, tandem extrusion, blown film extrusion, blow molding, injection molding, vacuum forming, and as skived film and solvent casting (only THV-220). 

For long runs and high outputs calendering probably is the most economical method for making thermoplastic film or sheet (in the case of conventional rubbers, as distinct from thermoplastic elastomers, it often is the only process available for making wide sheets). Speaking broadly, extrusion is the preferred method for manufacture of film and sheet in materials other than PVC. 

Biodegradable polymers are similar in terms of their chemical structure to conventional thermoplastics such as polyethylene, polypropylene and polystyrene. They can be processed using standard polymer processing methods such as film extrusion, injection moulding and blow moulding. 

Extrusion is a cost effective manufacturing process. Extrusion is popularly used in large scale production of food, plastics and composite materials. Most widely used thermoplastics are processed by extrusion method. Many biopolymers and their composite materials with petroleum-based polymers can also be extruded. These include pectin/starch/poly(vinyl alcohol) (Fishman et al. 2004), poly(lactic acid)/sugar beet pulp (Liu et al. 2005c), and starch/poly(hydroxyl ester ether) (Otey et al. 1980), etc. In this study, composite films of pectin, soybean flour protein and an edible synthetic hydrocolloid, poly(ethylene oxide), were extruded using a twin-screw extruder, palletized and then processed into films by compression molding process or blown film extrusion. The films were analyzed for mechanical and structural properties, as well as antimicrobial activity. 

Next to tubes and fibers, tbin ceramic sheets are also a very interesting subject for the development of thermoplastic ceramic extrusion systems. It has been shown that it is feasible to produce ceramic sheets and films with thicknesses under 200 pm. Figure 8 shows a picture of a ceramic sheet made of silicon dioxide nanoparticles. This technique could, for example, be used for the fabrication of multilayer ceramic bodies (e.g. multilayer capacitors, structural laminates) which currently are produced using the tape casting process. Big advantages relative to this conventional process would be the recycleability of the thermoplastic feedstocks and the higher achievable powder loading. 

Low Density Polyethylene A branched-chain thermoplastic with density 0.91-0.94 g/cm. Has good impact strength, flexibility, transparency, chemical resistance, dielectric properties, and low water permeability and brittleness temperature, but poor heat, stress cracking, fire resistance, and weatherability properties. Processed by extrusion coating, injection and blow-molding, and film extrusion. Can be cross-linked. Used in packaging and shrink films, toys, bottle caps, cable insulation, and coatings. Also called LDPE. 

Uses Barrier resin in sheets, films, pkg. materials, gas till pkg., pkg. for oily foods, edible oils, min. oils, agric. pesticides, org. soivs. suitable for film extrusion, sheet coextrusion, bbw molding coextrusion, tube profile coextrusion, extrusion coating, and laminating procedures Features Thermoplastic... 

Uses Thermoplastic for extrusion into sheet, film, and coatings, for inj. molding, blow molding, thermoforming blendable with other materials for adhesives and sealants... 

Film blowing (blown-film extrusion). The process of forming thermoplastic film wherein an extruded plastic tube is continuously inflated by internal air pressure, cooled, collapsed by rolls, and subsequently wound into rolls on thick cardboard cores. The tube is usually extruded vertically upward, and air is admitted through a passage in the center of the die as the molten tube emerges from the die. An air... 

Films are thin sections of the same polymers described previously. Most films are thermoplastic in nature because of the great flexibility of this class of resins. Films can be made from most thermoplastics. Films are generally made from thermoplastic resins by extrusion, casting, calendering, and skiving. The films are sold in thicknesses from 0.5 to 10 mil. Thickness in excess of 10 mil is more properly called sheets. Tapes are films slit from film to some acceptable width and are frequently coated with adhesives. 

PCL can be processed by the usual thermoplastic processiug techuiques, includiug blows aud slot cast film extrusion, sheet extrusion, and injection moulding. The low melting point of PCL pofymers requires lower temperatures than pofyetlylene and other polyolefins. 

However, despite these possible methods for forming scalar thermoplastic films, for large-scale manufacture, an extrusion process is usually used. 

PE/starch films were formulated in US by Otey et al. [53]. They developed a process for extrusion, compounding and blowing of starch as a thermoplastic film at 5-10% moisture. The concept of using com starch as filler to accelerate the degradation process was developed by Griffin in the UK in 1973 [54]. Griffin found that the degradation of starch/LDPE... 

The serendipitous discovery of polytetrafluoroethylene (PTFE) in 1938 by Roy J. Plunkett [82] and his co-workers at DuPont research laboratories has spurred the development of a variety of fluorine containing polymers, which include fluorosilicones, fluorinated polyurethanes, fluorinated thermoplastic elastomers, etc.. Many of the commercial fluoropolymers are suitable for melt processing via conventional injection molding, screw extrusion and blown film extrusion techniques. 

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