Opening Devices used in Blow Room

The action of opposite spikes is opening the cotton fibre. By this action, the large pieces of cotton have been reduced in size. 

Classification of the opening devices? 
Opening units can be classified as: 
• Endless path 
• Gripping devices 
• Rotating assemblies 
Depending on their design, construction, adjustment, etc., these assemblies exert enormous influence on the whole process. 
1. Endless path device: 
Spiked lattices are known as endless path device. It serves as forwarding and opening devices in bale openers and hopper feeders. They consist of circulating, endless lattices or belts with transverse bars at short intervals. The bars are of wood or aluminium; steel spikes are set into the bars at an angle and at greater or lesser spacing. 

The intensity of the opening action is dependent upon: 
• The distance between the devices; 
• The speed ratios; 
• The total working surface; 
• The number of points.
Opening devices
Opening devices: (1) Endless path device, (2) Gripping elements, and (3) Roller with teeth, blades or spikes

2. Gripping elements (plucking spring):
Some manufacturers, for example, former Schubert & Salzer and Trützschler, have used plucking springs for opening. Two spring systems, facing each other like the jaws of a pair of tongs, are parted and dropped into the feed material and are then closed before being lifted clear. They grasp the material like fingers. This type of gripping is the most gentle of all methods of opening, but it produces mostly large to very large clumps of uneven size. This type of opening device is therefore no longer used. 

3. Rotating Devices (Roller with teeth, blades or spikes):
Flat, oval or round bars are welded, riveted or screwed to closed cylinders. The rollers are therefore called spiked rollers. The various spacing of the striker elements is used. These devices are incorporated mainly in modern horizontal cleaners, chute feeds, mixing bale openers, step cleaners, etc., which are located from the start to the middle of the blow room lineAt the start of the line, the spacing of the striker elements on the roller is greater; finer spacing is used in the middle (to the end) of the line. The rollers rotate at speeds in the range of 600 - 1 000 rpm.

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