Ribbon machine

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. 

The Coming ribbon machine for high-speed automatic production of glass light bulbs was developed. 

Figure 26.12 shows the ribbon machine developed in 1926 by Corning for high-speed production of light bulbs. In this process a stream of molten glass is made into a ribbon by passing it through a pair of rollers. The ribbon... 

Mold-closing cam Mold-opening cam FIGURE 26.12 The Corning ribbon machine for glass lamp bulbs,... 

The plants are hand-cut, mowed, or pulled in developing coimtries, while mechanized harvesting methods are imder investigation in the United States. Ribboning machines are sometimes used to separate the fiber-containing bark before retting for recovery of the kenaf strands. For pulping, the kenaf is shredded or hammermilled to 57-cm pieces, washed, and screened. 

FIGURE 6.13 The ribbon machine used for light bulb-envelope manufacture. [I/.S. Patent 1,790, 397 (Jan. 27, 1931), W. J. Woods and D. E. Gray. Courtesy of Coming bicorporated.]... 

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