Rubber knifing

This technique uses a frame with a textile or stainless steel screen in which some meshes have been closed and some left open in order to give the required printing pattern. A rubber knife passes over the screen to push the adhesive through the open meshes. This will provide the required pattern of coating and then flock fibres, for instance may be sprayed onto the adhesive coat. 

Radier-fimis, m. etching varnish, -gnind, m. etching grotmd. -gummi, m. (rubber) eraser, -kunst, /. (art of) etching, -messer, n. erasing knife. 

The opening of a second tapping panel on rubber trees at a height of about 2.5 m above the ground, access to which requires the use of a ladder or long-handled tapping knife. 

Rubber coated fabric is cut to give a bias to the fabric on its application to the tyre carcass. The knife angle can be adjusted in the cutting machine. 

Cut and discard a 1-inch segment from each end of the cartridge, using a spark-proof knife or hard rubber spatula... 

Rubbered fabrics exhibit a characteristic odour and appearance which alone suffice for their identification. The rubber may be removed —so that the fibres may be identified or estimated—by immersing the material for about an hour in a mixture of equal volumes of benzene and oil of turpentine on a water-bath. The rubber is thus softened and swollen and may be removed readily by scraping with a knife. The removal may be completed by dipping the fabric repeatedly into the hot solvent and renewing the latter from time to time. 

The electron micrographs of the various ERL-4221-CTBN systems were prepared with the osmium tetroxide technique (3). The castings were stained by reaction with osmium tetroxide vapors for 24 hours. Ultrathin specimens, approximately 1000 A thick, were cut with the Reichert OMU2, ultramicrotome equipped with a diamond knife and were stained again for one hour. The osmium tetroxide selectivity stained the rubber phase, while the epoxy remained unaffected, revealing many structural features in the polyphase systems with excellent contrast and... 

The machining techniques used are like that employed with rubbers— for example, "knifing"—and in extreme cases the polyurethane may have to be taken to subzero temperatures. Using standard stock polyurethane sections, it is possible to machine prototypes using modified metal working techniques. 

The first shaping method is a steady continuous process. It is among the oldest methods, and is used extensively in the rubber and plastics industries. It includes the classic calendering, as well as various continuous coating operations, such as knife and roll coating. 

In some applications, impulse sealers are being replaced by machines which employ a continuously heated knife. In such machines, the film is supported across a roller which is coated with a resilient material such as silicone rubber (to which molten polyethylene will not adhere) and the hot knife edge pressed on to it. A strong bead edge seal is obtained. 

Knife spreader Usually used to apply high-viscosity adhesives to flexible webs web is drawn between a precision knife edge and a rubber roller or flat-bed plate... 

At the International Exhibition of 1862, Alexander Parkes [2] first introduced an organic derivative of cellulose that could be moulded when heated and retain that shape when cooled. He invented the treatment of cellulose fibres with nitric acid forming cellulose nitrate that was the first semi-synthetic plastic material. He used this to make decorative brooches, trinkets and knife handles. He claimed that it could do anything that rubber could do but could be produced at a lower price. He formed a company making a... 

Use To scrape dried films, such as soap flakes, from drum dryers to remove ink from printing rolls clean residual paper stock from rolls and to provide a crimped paper for toweling, etc. and to remove soft or sticky rubber and adhesive compositions from mixing rolls. An interesting application is the so-called air doctor (air knife) it is actually a stream of air delivered by a turbine blower through a tube with a discharge slot. Located at the take-off end of a... 

The next step is to make washers for the positive electrode assembly. These are two nickel alloy washers and two silicone rubber washers. Use a 1" diameter washer as a model to trace the circumference and center hole onto the rubber and the nickel alloy sheet. Use a punch to cut out the center hole in the rubber sheet, and a punch or drill to cut out the center hole on the nickel alloy. The circumference of the rubber sheet can be cut with an exacto knife and the circumference of the nickel washer can be cut with tin snips. 

From either. 010 or. 020 silicone rubber, cut the hydrogen gasket with an Exacto razor knife using the template (see page 248) as a guide. This thin silicone material comes sandwiched between two pieces of Mylar . The Mylar will be used to mount the MEAs (membrane electrode assemblies). When you remove the silicone from the Mylar , the silicone will shrink, so do not cut it while it is... 

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