Blow method

The ribbon machine employs a puff-and-blow method to make incandescent light bulb envelopes (1200/min), dashbulb envelopes (2000/min), Christmas tree ornaments, and the like (Fig. 15). For larger articles, the turret chain machine also uses the puff-and-blow method, but produces less cuUet and uses individual glass gobs rather than ribbon. 

When film is produced by air-cooled tubular blowing methods cooling rates are slower and larger degrees of crystallinity result. Hence tubular film is slightly... 

Molding, blow Method of forming plastic articles by inflating masses of plastic material with compressed gas. 

Blowing methods work best for deep products and it frequently trust be used for thin-walled items, A common procedure, called the blow and hluw. involves two steps, of which the first is shaping the glass charge into a form called a blank or parison. Gob-fed machines receive the gob in the parison mold, where it is shaped inlo a cylinder ahoul iwo-lhirds the... 

Figure 5 shows an outline of the experimental appratus. The fused lead was placed in a reaction tube made of quartz. The reaction was studied by the bubbling method in which H2S was bubbled into the fused lead and by a soft blowing method in which H2S was blown onto the surface of the lead. The H2S gas stored in vessel No. 1 was circulated by pump No. 2. Since the lead content was in excess of the H2S in order to maintain the liquid state, the reaction behavior was examined in this experiment until the gas reached the equilibrium composition. 

A variety of standard and specialized applicators exist for pressure-sensitive labeling. Standard portable head applicators provide top, side, and bottom labeling. These applicators use one of several basic methods available for application of automatic pressure-sensitive labels. In a tamp-blow method of application, the label is dispensed from the backing web and held in position by vacuum on a tamp pad. The tamp pad is indexed 0.8-1.5 cm away from the product, and then the label is applied to the product by a gentle blast of air. Tamp-blow applications are used for a large array of packages that have irregular, curved, or recessed surfaces. 

Plastic foams are generally made using any of seven different blowing methods (7) ... 

Aromatic polysulfones can be reprocesses by die-casting, by means of extmsion, pressing, blow method [150, 151]. The aromatic polysulfones... 

In USA the ratio of manufacturers using physical blow methods to chemical blow methods is at present approximately 90 10 whereas in Europe the ratio is 10 90. 

There are two general methods available for producing the cellular core of SF mouldings (see PST 2). One method relies on the chemical decomposition of a blowing agent at elevated temperatures - the chemical blow method. The other method involves the formation of gas cells due to a physical change such as from liquid to gas to the expansion of a compressed gas - the physical blow method . 

BIP use the physical blow method for producing the Geest trolley base, the process being licenced from the American company Union Carbide. 

Rolling, casting, pressing, spin casting, press-and-blow method, drawing are possible... 

Aromatic polysulfones can be reprocesses by die-casting, by means of extrusion, pressing, blow method [150,151], The aromatic polysulfones should be dried out for approximately 1.8 Ifr sec at 120 until the moisture is more than 0,05%. The quality of articles based on polysulfone worsens at higher moists though the polymer itself does not change its properties. The polysulfones are reprocessible at temperatures 315-370 °C. 

The needle blow method Is also used for squeezed canister handles. A separated blast chamber Is necessary so that no filling material can sediment (environmental protection). It Is therefore Important that the area where the needle enters Is less and regularly stretched to ensure clean, reproducible production. 

The process of film extrusion by the film-blowing method was conducted on a Une specially designed for film manufacture in the Department of Food Process Engineering, Lubhn University of life Science (PL), based on a single-screw plastic extruder of L/D = 35 (Figure 9.1). The Une was produced by SAVO Ltd Co., Poland. 

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