Continuous dyeing plant for warp threads comprising an oxidation apparatus having variable and recoverable capacity

Abstract

A continuous dyeing plant for a warp thread including a plurality of dyeing / squeezing groups arranged in line, each of which is provided with a respective impregnation or dyeing tank in which the warp thread is immersed, and an oxidation apparatus that has a plurality of upper and lower return rollers, configured to arrange the warp thread on a plurality of vertical planes parallel to each other, and a support frame having at least one upper strut and at least one lower strut, where a plurality of upper return rollers are mounted on the upper struts, such that at least one part of the lower return rollers is rotatably mounted on at least one respective support device that is movable in the vertical direction between a first operating position, in which the movable support device is placed close to the lower struts to keep the lower return rollers at a maximum predefined distance from the corresponding upper return rollers, and a second operating position, in which the movable support device is placed close to the upper struts to keep the lower return rollers at a minimum predefined distance from the corresponding upper return rollers.

Description

TECHNICAL FIELD[0001]A dyeing plant of threads is provided and, in particular, an oxidation apparatus applicable to continuous dyeing plants, in plane and with indigo dye, of warp threads for denim fabrics. The oxidation apparatus is configured to oxidize the threads passed through the dyeing plant after each single dyeing and with variable and recoverable capacity.BACKGROUND[0002]Denim is the most produced fabric in the world, since it is used to make jeans. As known, indeed, jeans are trousers of practically universal use and availability.[0003]Denim is produced by weaving a chain of warp threads, already dyed with indigo, with an unbleached weft thread. Both the threads are made of cotton. The warp chains are dyed, continuously, with indigo. Indigo is a dye having very special characteristics, which requires a special method of application. This dye, having relatively small molecules, has very little affinity with cellulose fiber, such as cotton, and for the application thereof i...

AI Technical Summary

Benefits of technology

The patent is about a new invention for a dyeing plant for threads that reduces the amount of thread exposed to air, which causes deterioration during production stops and starts. This reduces economic waste and improves environmental protection. The invention is a simple and cost-effective solution that allows for adjustable amounts of thread exposure to air, making it easier to control the dyeing process and keep the thread tension constant.

Problems solved by technology

In light of the above, there is clearly a need to be able to drastically reduce the amount of thread exposed to air in oxidation apparatuses, which is the cause of the relative deterioration both during the end of batch operations, i.e. before the stopping of the dyeing plant necessary for the introduction of the new batch of thread, and during the starting operations of the new batch of thread, i.e. when the plant is started up at low speed.

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