Drafting zone of draw frame spinning machine

Drafting zone of draw frame spinning machine:

Introduction:

A long bar or shaft from one end of the draw frame machine to the other, with the drawing head being separately footed i.e. designed for gripping the fibers. The drafting roller is the part that performs the work for drafting or fiber gripping. The top roller is not as long from one end of the frame to the other as the bottom roller but is just as long as the roller needed in the drafting zone. https://bdfabric.com/draw-frame-introduction-definition-purposes-function/

The top roller is wrapped with a rubber mat so that the fibers do not cut even under high pressure. So the pair of rollers should be made in such a way that the fibers passing through the rollers can be pulled properly without excessive pressure and the gripping of the fibers is also correct. If the above actions are not done properly, the irregularity of the sliver will increase and the waste of good fiber will increase. Above all, the cost of manufacturing yarn will also increase.

Drafting zone of draw frame spinning machine:

The main function of the draw frame is to produce 1 sliver by doubling the 4, 6, or 8 slivers obtained from the drafting and lifting carding machine. At the same time, the fibers of the slivers are pulled straight and parallel to make uniform slivers. The drafting zone is the main role played by the draw frame to produce fine slivers. 2, 3, or 4 pairs of rollers work in the drafting zone.

Among these rollers, the top and bottom pair of rollers work. The upper rollers are called top rollers and the bottom rollers are called bottom rollers. The roller is an essential and necessary part of the drafting zone. So the design and setting of the roller are made keeping in mind the main purpose i.e. drafting, and doubling of the draw frame spinning machine. Good gripping of the fibers by the top and bottom rollers is desirable for better drawing delivery.

Types of roller in drafting zone:

Drawing frames generally have two types of rollers.

1. Top roller.

2. Bottom roller.

1. Top roller:

The rollers above the drafting zone of the draw frame spinning machine are the top rollers. It usually covers the metal bar of the top roller with rubber, synthetic rubber, leather, or similar materials. The top roller in the top zone of the drafting zone plays an important role. For the purpose of gripping the required draft and fibers, some weight is placed on the top roller, whose oriented fibers are gripped nicely to produce the required sliver of hank with the proper draft. If no rubber was used on either the top or the bottom roller, the fibers would have been cut or torn by the pressure of the two metal rollers.

2. Bottom roller:

The bottom roller plays a very important role among the various parts of the draw frame. The bottom rollers are the bottom rollers in the drafting zone of the draw frame. From one end of the machine to the other end i.e. a metal bar equal to the length of the machine, which is divided into parts according to the head of the draw frame spinning machine. Each part is designed differently. Rollers for fiber gripping and main work drafting are designed separately only in the drafting zone. In some cases, the bottom roller is divided into different parts. A single pair in each section can be fitted from one end of the machine to the other making one continuous long roller. The drafting part of each roller has grooves. This notch can be different.

1. Axial or straight flutes.

2. Inclined or helical flutes.