Detwister - squeezer AS/CA

The detwisters-squeezers type AS/CA have given great benefit in the processing of tubular knitted fabrics between the dyeing and drying operations. Fabric handling is reduced considerably compared to traditional methods such that the only manual operation required is the sewing together of adjoining fabric pieces.

Additional processing benefits are achieved with the AS/CA with its provision for fabric straightening and the facility for addition of certain finishes in the wetting out bath.

The AS/CA machine, available in several models, can perform the following functions:

  • remove fabric twisting arising during dyeing
  • provide uniform water distribution prior to squeeze
  • enhance the appearance of the knitted loop structure by the air injection and balloon inflation system
  • present tubular fabric in spread plainted form ready for drying
  • overcome fabric creasing caused in traditional hydroextraction by centrifuge.

Options

The machine can be supplied with standard rubber squeeze rollers or rollers with special covering for improved hydroextraction.
Machine can be supplied with or without fabric expanders.
Machine can be supplied to process single rope or two ropes in parallel.

The picture above on the left shows a rope of dyed fabric being immersed in the wet-out bath then inflated by air injection. The resulting balloon is squeezed in the upper mangle. Water running along the fabric surface provides a seal to the air balloon. Maximum speed is 50 metres per minute.
The picture on the right shows an AS/CA seen from the plaiter side.

On the pictures above is shown:
1. An AS/CA machine from the inlet side. The squeeze rollers can be rubber or "Roberto" type: the latter ensure a residual water content very close to that archived by centrifuge hydroextraction.

2. A twin AS/CA-d machine: first it squeezes the wet tubular fabric and then presents it to the second stage for an addition of finish in the wet-out tank. Notice that a film of process liquor continuously flows across both outer and inner surface of the tubular fabric, thus providing uniform distribution throughout the fabric. The second squeeze acts as a pad mangle to provide residual uniformity of finish on the fabric.

This double squeeze process also ensures that the finishing bath is not diluted by the wet fabric, as surplus moisture has been removed by the first squeezer.

3. A twin AS/CA-D-AM machine with mechanical expander seen from the outlet side.

Schematic diagram of an AS/CA with turntable driven by twist detectors. Note the machine, the twist detectors, the twist detection controller, the turntable carrying the fabric trolley prior to process.
When rotating trollies are used, the platform is replaced by a motorized rubber drive wheel.