Method and apparatus for flow control in a package dyeing machine

Abstract

A method of controlling fluid flow rate during operation of a textile package fluid treatment machine, comprises measuring the differential pressure across a unidirectional pump (15) in a fluid circulation system connected to a kier (1) of the machine and comprising a reversal device (2) which is switched during operation of the machine to reverse the direction of fluid flow through at least one package in the kier; calculating the fluid flow rate through the fluid circulation system from the measured differential pressure using a performance characteristic of the pump; monitoring the flow rate over time to determine the accumulated flow between each switching of the reversal device; and using the accumulated flow information to automatically control switching of the reversal device such that total flow between each switching of the reversal device is substantially equal. The calculated flow rate may also be compared with a desired flow rate to determine any flow rate difference, fromwhich operation of the pump is automatically adjusted to reduce the flow rate difference.

Description

technical field [0001] The invention relates to a method and an apparatus for controlling the flow of a treatment fluid in a cheese dyeing machine. Background technique [0002] Fabrics such as yarns, warp yarns, ribbons, etc. are generally wound on large tapered spools or bobbins to form packages for processing by fabric processing machines. Fabric treatment includes dyeing and includes treatment with substances other than dyes, where the dye or another treatment substance is diluted in water to obtain a treatment fluid or liquor. A quantity of the package is loaded onto the hollow yarn bamboo inside the cylinder of the processing machine, which is filled with a treatment fluid, and the fluid is then passed through the package using a fluid circulation system. A pump drives fluid around the circulatory system. [0003] To achieve uniform treatment effects, such as uniform dyeing, two fluid flow paths are typically used. The inside-to-outside flow path sends fluid up the ...

AI Technical Summary

Problems solved by technology

The time required to obtain this timing parameter can also be very long

There is another disadvantage in that energy is wasted due to the large amount of process fluid which may be at high temperature needs to be circulated for a longer time than would otherwise be required

Furthermore, since this known method is very empirical, new modulation methods for dyeing etc. have to be extensively tested in order to find a reasonable balance between flow direction from inside to outside and from outside to inside; this means Adaptability and repeatability cannot be guaranteed

Images