Molding tube blowing

Stretch blow molding that employs an injection molded, extrusion blow-molded preform, or extruded tube preform... 

The major difference between injection and extrusion blow molding is the way the soft hollow tube (called a preform or parison) is made. In injection blow molding, two different molds are used. One mold forms the preform and the other mold is used in the actual blow-molding operation to give the final shaped article. In the molding process, the softened material preform, from the preform mold, is introduced into the blowing mold and blow-molded to... 

HDPE. [Dow Plastics] HOPE for inj. molding, extrusion, blow molding and sheet vacuum forming iy>plics. incl. gas tanks, drums, laige industrial parts corrugated tubing, housewares, blown film. 

Figure 6.63 A section of a two-layer blow-molded tube.> >...

Uses Barrier resin in pkg. materials, gas fill pkg., pkg. for oily foods, edible oils, min. oils, agric. pesticides, org. soivs. suitable for film extrusion, sheet coextrusion, blow rmlding coextrusion, cast film, blow molding, tubes, coex coating Features Thermoplastic... 

Polyarylate resin blow molding, housings Styrene/butadiene polymer blow molding, medical devices Styrene/butadiene polymer blow molding, tech, parts Styrene/butadiene polymer blow molding, toys Styrene/butadiene polymer blow molding, tubes Styrene/butadiene polymer... 

In extrusion, injection molding, or blow molding machine a hollow tube in which the plastic material is gradually heated and melted and from which it is extmded. 

Figure 1.4 Three Station Injection Blow Molding Machine [Miller, 1983]. The parison is injection molded on a core pin (instead of as a tube in free air, as with extrusion blow molding) at the preform mold station (1). The parison and neck finish of the container are formed there. The parison is then transferred on the core pin to the blow mold station (2) where air is introduced through the core pin to blow the parison into the shape of the blow mold. The blow container is then transferred to the stripper station (3) for removal.

Fig. 21. Extrusion-molded neck blow-molding process, (a) Body section open, neck section c ose, nec sec ion re rac ed, (b) neck section extended to mate with parison nozzle (plastic fills neck section) (c) neck section retracted with parison tube attached (d) body section...

A similar procedure exists for producing hollow discontinuous profiles. Tube Blowing RTM utilizes a preform with the textile component wrapped around a flexible blow tube. The preform is placed in a mold and internally pressurized to ensure a uniform draping at the tool wall. The resin is then injected into the preform with a pressure lower than the inner pressure (Figure 1.17) [58]. 

Fig. 9-19. Basic pinch-tube blow-molding process. Courtesy Monsanto Co., Hartford, Conn.)...

Approximately 45% of all HDPE used in the United States is blow molded. In blow molding, a short length of HDPE tubing is placed in an open die [Eigure 29.5(a)] and the die is closed, sealing the bottom of the tube. Compressed air is then forced into the hot polyethylene/die assembly, and the tubing is literally... 

Film, Blow-Molding, Tubing, Extrusion-Coating... 

U10-11 1.0 Excellent processability in extrusion blow molding, injection blow molding and extrusion. High melt strength. Low odor grade for aerosols. Aerosols, containers, industrial articles, rod, tube, slab, profiles. 

Figure 10.51 A section of two-layer blow molded tube.t ° ...

The extrusion-blowing of hollow bodies also requires pressurized air, but this process is discontinuous. A tube (or parison) is extruded into an open mold. After closing the mold, a blow mandrel (not shown in Figure 13.14) is inserted into the parison head through which pressurized air is blown this causes the parison to adopt the shape of the mold the blow mandrel is then lifted and a cutting blade separates the hollow body from its top, ejecting the molded body upon opening... 

Though the nylons originally were developed for their fiber-forming characteristics, their first commercial application was for toothbrush bristles, and shortly thereafter they were used for women s stockings. Not only are they drawn into monofilament and spun into fiber they are extruded into film and tubing, blow-molded into bottles, injection-molded... 

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