Damping pre-shrinking machine
11 Usage performance and structural composition
The damping preshrinking machine consists of cloth inlet steaming, preshrinking and cloth outlet parts, as shown in Figure 9-8.
The cloth feeding and steaming part consists of cloth feeding roller, expander, overfeeding device and steam moistening box. The fabric passes through the cloth feeding roller, overfeeding device, and enters the steaming device. The steaming device is a disc-type upper and lower steaming box with a steam injection pipe installed in the box to moisten the fabric.
The pre-shrinking part is composed of two sets of damping pre-shrinking devices to meet the needs of pre-shrinking the knitted fabric on both sides. Each group consists of a feed roller, a retard roller and a damping knife. The retard roller and feed roller are heated by steam, the damping knife is heated by electricity, and the pressure exerted on the fabric is controlled by a pneumatic device.
The cloth discharging part consists of rubber roller curtain belt, winding device or folding device. After the fabric leaves the second set of pre-shrinking devices, it is sent to the winding or folding device by the rubber roller curtain belt, where the fabric is rolled or folded.
The fabric operation process is: open-width dry cloth feeding by the cloth feeding roller → overfeeding wheel → steam moistening → two sets of damping preshrinking → rubber roller curtain belt feeding → folding or rolling out the cloth.
Damping pre-shrinking machine is suitable for pre-shrinking knitted fabrics such as cotton wool, elastic rib fabric and jersey. The pre-shrink rate is 0~30%, which can be adjusted according to needs. The pre-shrunk fabric will be flat and the width will be stable. , small shrinkage, soft fabric feel.
21 Preshrinking Mechanism
The retard roller surface is rough and the linear speed of the roller surface is low, while the feed roller surface is completely smooth and the linear speed is high. Under the hot pressure of the damping blade, the fabric is close to the surface of the feed roller and is pressed into the nip point between the two rollers, forcing the fabric to shrink and playing a pre-shrinking role. At the same time, the fabric is stabilized due to hot and humid conditions. The shrinkage of the fabric can be controlled by the speed difference between the two rollers. The greater the speed difference, the greater the amount of pre-shrinkage; the smaller the speed difference, the smaller the amount of pre-shrinkage.
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