Draw process

New test, after these modification s, showed better measurements up to 350 m/min but now it also became evident that oil from the drawing process build up on the transducer surface and damped the signals and made measurements impossible. The oil build up as a combination of inspection length (m of tubes) and inspection speed. At lower drawing velocities (70 m/min) the oil obvious was washed away giving no inspection problems. The water system was modified as follows ... 

The resin has the ability to be oriented by a drawing process and crystallized to yield a high-strength product. 

When drawdown is high, the film may be uniaxially oriented and the properties of the final film isotropic. In the manufacture of strapping tape this effect is accentuated. If the cast or quenched film is to be used to feed an orientation tine, additional attention must be given to the amorphous—crystalline nature of the film ia the draw processes so that maximum strength can be achieved and uniform gauge and optical quality maintained. Slot casting is used for the orientation of these resins, polyesters, polyamides, and a variety of others. 

One of the limitations of the curtain/slot draw process is that the amount of fiber attenuation is constrained due to the short distance generally allowed between the spinnerette and the venturi slot and the use of relatively low pressure air for drawing so as not to induce high turbulence in the area of the laydown. In practical terms this has made the process difficult to adapt for the production of polyester fabrics which inherently require much higher fiber acceleration to attain the desired polyester fiber properties. 

Fig. 7. Spin-drawing processes for nylon yam (a) draw-twisting process, (b) conventional spinning process, and (c) coupled process.

New Developments in Spinning and Drawing. The continual effort by the fiber producers to increase production, lower manufacturing costs, and improve quaUty has led to a better understanding of the effects of the spinning and drawing process on physical and molecular stmcture of... 

Defects in finished components can sometimes be traced as far back as casting problems in the ingot or billet from which the component was eventually produced. Defects in welded tubes may be linked to defective metal or to the welding process itself Defects in seamless tubes can originate in extrusion or drawing processes. 

COLO DRAWING PROCESS CAPABIUTY MAP FOR COPPER AND COPPER alloys... 

As the basic fiber microstructure is determined during the spinning and drawing processes, several spinning process variables have a significant impact on fiber properties e.g., flow rate, winder speed, spinnerette geometry, etc.). Spinning... 

The standard requires purchasing documents to include, where applicable, the title or other positive identification, and applicable issue of specification, drawings, process requirements, inspection instructions, and other relevant technical data, including requirements for approval or qualification of product, procedures, process equipment, and personnel. 

Two-piece food cans may be made by a draw-redraw process, in which lacquer is first applied to and cured on sheet. Blanks are then cut from the sheet and the can is drawn from the blank in two or three stages. The lacquer deforms with the drawing process and lubricates the draw. It then becomes the interior protective coating. Although epoxy-phenolic solvent-borne lacquers are used, even better drawing properties are obtained from organosols. These are dispersions of colloidal polyvinyl chloride powder in solutions of other mixed resins in solvent, e.g. chosen from epoxy, polyester, vinyl and phenolic. 

Drawn and Ironed Steel Cans. Drawing and ironing grew out of the drawing process. Figure 7 depicts D I cans for foods. The drawn and ironed tinplate can is usually produced by drawing a cup from a coil of lubricated matte tinplate. 

Light wave technologies provide a number of special challenges for polymeric materials. Polymer fibers offer the best potential for optical communications in local area network (LAN) applications, because their large core size makes it relatively cheap to attach connectors to them. There is a need for polymer fibers that have low losses and that can transmit the bandwidths needed for LAN applications the aciylate and methacrylate polymers now under study have poor loss and bandwidth performance. Research on monomer purification, polymerization to precise molecular-size distributions, and weU-controlled drawing processes is relevant here. There is also a need for precision plastic molding processes for mass prodnction of optical fiber connectors and splice hardware. A tenfold reduction in the cost of fiber and related devices is necessaiy to make the utilization of optical fiber and related devices economical for local area networks and tlie telecommunications loop. 

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