The design and construction of the size box depends on the type of warp yarn. Its structure, type of the fabric to be manufactured etc…
The conventional type of size box shown in figure below which is used in the old two cylinder sizing range is rectangular in shaft and open at top except for the smaller compartment.
The box divided into two compartment. A smaller one at the front end and a slightly larger one at the near end. The two compartment are separate by a portion with a small rectangular opening at the bottom for the size mixture to flow from one to the other compartment. The smaller compartment which is usually with a lid to prevent evaporation of water from the size paste act as a storage or reverse compartment to which the size paste is supplied from the storage back of the size mixture through a feed pipe. The float roller shown fig. is to keep constant the level of size mixture in the size box. The float roller is simply a hollow copper rubbing and due to its light weight compound to its volume floor on the surface of the size mixture. It is provided with an air tube to prevent collapse due to fall in temperature.
The rear compartment contain on immersion roller which can be raised or lowered by means of a rack and pinion arrangement. The warp sheet roller and then goes around the lower half of the immerse roller by raising or lowering the immersion roller the length of the path of the warp sheet though the size mixture can be decreased or increased, respectively, as design. This control the size pick-up by the warp longer length of the path giving higher pick-up and vice-versa as required. The rear compartment contain on immersion roller which can be raised or lowered by means of a rack and pinion arrangement. The warp sheet roller and then goes around the lower half of the immerse roller by raising or lowering the immersion roller the length of the path of the warp sheet though the size mixture can be decreased or increased, respectively, as design. This control the size pick-up by the warp longer length of the path giving higher pick-up and vice-versa as required.
The yarn then passes over the size roller. Which formally used to be “a copper roller” on the top of the size roller rest the squeeze roller. The yarn passes out through the nip between the side roller and the squeeze roller and get squeezed. The squeeze give the penetration of two size into the yarn interstices and also experts out the excess of the size from the surface of the yarn to leave on uniform, smooth film on it.
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