Pick-up roll

In roll coating arrangements of the sort shown in Figure 1, liquid is carried by the pick-up roll into the nip region between it and the applicator roll. Beyond the nip the liquid is, in effect, stretched and split into two films, each carried off... 

Pick-up roll—A spreading device where the roll for picking up the adhesive runs in a reservoir of adhesive. 

Pick-up roll n. (1) In the coil coating industry, the roll which revolves within the pan... 

There are many different powered vehicles for materials handling. The term industrial track covers many of them. The most common industrial track is a forklift track, fitted with two forks or tines. Some have other devices beside forks for special lifting tasks. For example, some have a single, long fork for lifting carpet rolls and similar rolled material. Some have a clamp device to pick up rolls of paper that normally rest on the end of a roll. 

In the basic system of Fig. 45, the glue will rise on the roll if it wets and adheres to the roll. In order to have this, the glue should not be too fluid because it would then immediately run down and there would not be enough glue on the roll. It should also not be too thick because the pick up roll would pick too much glue and the machine would get dirty very quickly. Therefore, the adapted viscosities should be between 1000 and 30,000 mPas. When the adhesive is fluid, the coating system may be reduced to one roll only, and the excess will run down. Coating speed a few metres per minute. 

Doctor roll. The gap between the pick up roll and the coating roll is adjustable and this determines the adhesive add-on. It is possible to apply thick adhesives up to 50,000 mPas and control accurately the adhesive thickness which may vary from 10 to 150 g/m. This system allows also to apply fluid adhesives at very high speed and low add-on (2 to 50 g/m ) (Fig. 40 and 48). The doctor roll reduces foaming because it squeezes the foam bubbles which could result from the agitation of the adhesive. Doctor rolls are always used in sophisticated roll coaters, when an accurate add-on is required and for high speeds. 

Pick-up Roll n (1) In the coil coating industry, the roll which revolves within the pan and is partially immersed in the paint. This roll picks up paint from the pan and applies it to the transfer or applicator roll. (2) Spreading device where the roll for picking up the adhesive runs in a reservoir of adhesive. 

In the manufacture of gummed tape, large rolls of paper are fed through a glue applicator, where the adhesive at a temperature of 140-145°F is applied by the use of pick-up rolls. The tape is passed under tension over drying rolls or through a drying tunnel, then stored as jumbo rolls until slit and cut into standard sizes for the trade. 

The time dependent him is also related to the running history as shown in Fig. 32. Before the system starts running, the static Him is 5 nm thick, /yter 60 minutes of running at a speed of 3.12 mm/s, the system stops running for 10 minutes, and the him drops down to 9 nm. When the system restarts running, the him rapidly recovers. This phenomenon indicates the hlms on the surface of substrates will adhere to the surface for a period of time when the rolling action has stopped, and the him thickness can pick up its value quickly once the rolling is restarted. 

The sample rack is unique in that it possesses pitch both front to back and side to side. A single robot pick-up point is defined, and an optical (IR) sensor constantly monitors the pick-up point for the presence of a sample. Vials placed in the rack roll down to the pickup point, under the influence of gravity. The rack allows implementation of a novel processing scheme. 

The prepreg is prepared as the carbon paper from a roll is run at approximately 3 mmin-1 through a bath containing the resin solution. Then the impregnated paper is run through a pair of driven stainless steel nip rolls set at a gap of from 0.5 mm to remove excess resin solution and achieve the desired pick-up of 78-80% by weight of the resin solution. 

What the crystal does, the film, representing a layer of the reciprocal lattice, must do also, and so its normal performs the same processing motion the film thus, so to speak, rolls around and through the sphere of reflection, picking up diffracted beams on the way, as it cannot fail to do if the film slavishly repeats the movement of the crystal. (The... 

As the machine speed has continuously has increased the dynamic forces to the web have increased and it has forced to support the web with felts to avoid web breaks. Before 30 s typically the web had open draw between press and wire section which was soon replaced with pick-up suction roll arrangement. In this arrangement web is picked up with a suction roll from wire and supported by press felt to the first nip. Most recent fast paper machines are using the same principle of suction roll and supporting fabric not only through press but also through dryer section. 

The use of vinyl eraser crumbs may be viable for the removal of some surface soils. However, the amount of pressure used and the direction the eraser crumbs are rolled are critical. Moving across or against the "grain" of the tapa will cause bits of fiber to be picked up on the eraser crumbs. 

When exposing the film it is important to leave two blank exposures at the beginning, and two more at the end. This means that a 24-exposure roll will yield 20 exposures. After the 20 exposures have been made, be careful not to rewind the film leader into the cassette. If your camera automatically rewinds the film, try taping the leader to the take-up spool when loading the camera. This may not work on all cameras, but give it a try. Otherwise, pick up a leader-retriever for a few bucks from a camera store. 

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