Rotary processing

Figure 4.23. Different possible flow modes in rotary processing of polyester resin 1 - quasi-solid rotation 2 - stable hydrocyst 3 - rotation in an annular (ring-shaped) layer, 4 - cascade flow. [Adapted, by permission, from I. L. Throne, I. Gianchandani, Potym. Eng. Sci., 20 (1980), 913.]...

A second solution is to use Harald Laban s AB C+ Pyro (available as Photographers Formulary Rollo Pyro). Adherents to Rollo Pyro claim that because of the use of ascorbic acid (vitamin C) as a preservative and a large quantity of pyro, it does not oxidize like traditional pyro formulas and can safely be used with JOBO rotary processing. Compared to other pyro/ cat developers, Rollo Pyro creates a light image stain. 

Pyrocat-MC is a Pyrocat variant that I recommend primarily for rotary processing, where it tends to give slightly greater acutance than Pyrocat-HD. It can only be mixed with propylene glycol. 

This high acutance formula is especially suited for stand development and minimal agitation techniques, although normal intermittent agitation and rotary processing may be used. 

For rotary processing dilute 1 5 (200.0 ml of stock solution to 1.0 liter of water). 

Flexo printing is similar to the traditional rubber-stamp techniques that have been in use for hundreds of years. The primary difference is that the flexible stamp (chche) in a flexo process is wrapped around a drum to be used in a continuous rotary process. In order to control the reinking of the cliche, an anilox roller, a metal or ceramic roller with small indentations (wells) of uniform size and shape, transfers ink firom a fountain to the cliche, as shown in Figure 4.6 through Figure 4.8. Diflferent rollers can be purchased to control the amount of ink that is transferred to the cliche. A doctor blade removes excess ink firom the anilox roller before it contacts the cliche. 

FIGURE 4.12 Rotoscreen printing schematic. Ink is pressed through a screen to the substrate in a continuous (roll-to-roll) rotary process. In this case, the substrate and screen move, and the spatula remains stationary. 

Flexographic printing n. A rotary process employing flexible rubber or elastomeric printing plates adhered to a roll, inked by a screen roll which in turn is coated from a feed roll immersed in ink. 

Li Shun P, Kowarski CR, Feld KW, Grim WM. Recent advances in microencapsulation technology and equipment. Drug Dev Ind Pharm 1988 14(2,3) 353-376. Robinson RL, Hollenbeck G. Manufacture of spherical acetaminophen pellets comparison of rotary processing with multiple-step extrusion and spheronization. Pharm Tech-nol 1991 15(5) 48-56. 

US 4917735 Rademachers Bayer Indirect Rotary Process for the Production of Rutile Mixed-Phase Pigments 04/17/90... 

US 5496404 Gaedecke BASF Prep for rotary Process for Preparing Inorganic Pigments of Particular Particle Size 03/05/96... 

Gu, Y. S., Howard, L. R., and Wagner, A. B. (1999). Firmness and Cell Wall Characteristics of Pasteurized Jalapeno Pepper Rings as Effected by Calcium Chloride and Rotary Processing. J. Food Set 64(3), 494-497. 

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