Rubber roller apron is one of the most important spinning equipment that directly affects the spinning quality. Companies also attach great importance to the use of rubber apron. However, with the rapid development of new technologies, new processes, new equipment, and new equipment, as well as limitations in understanding new technologies for manufacturing rubber rollers and aprons, there are often many misunderstandings in actual use, causing many unnecessary quality problems.
Selection of rubber roller type
For cotton varieties, try to choose non-treatment rubber rollers. For polyester-cotton varieties, try to use non-treatment and micro-treatment rubber rollers as much as possible. For pure polyester varieties, generally use processed rubber rollers. The quality requirements are high. Generally, treatment-free is used, and quality requirements are low. Generally, processing rubber rollers are used.
Coil roller diameter selection
When selecting the diameter of the rubber roller, it is often too large to grasp, even reaching about 36 mm, good elasticity, and many times of regrind, which saves costs and improves quality. The large diameter of the rubber roller is conducive to the extension of the drafting force boundary, but the rubber roller is deformed and pressed into an ellipse to generate a mechanical wave, which seriously increases the CVb value.
Response measures: According to the actual situation, reasonably select the diameter of the rubber roller. If it needs to be increased, it is also necessary to consider the process supporting and regrind cycle to avoid waste and quality deterioration.
Selection of rubber roller structure
Aluminum-lined rubber rollers have good pressure resistance and stability, but are expensive; the double-layer rubber rollers have a longer maturity period, a large sleeve difference with internal stress, and are easily aged and concave, but the price is relatively cheap.
Response measures: take each one required, high quality requirements use aluminum lining, low quality requirements, use double layers.
Selection of back roller
选用 The selection of the rear rubber roller is mainly based on the matching principle. The hardness is generally 5-10 degrees higher than the front rubber roller and the diameter is generally 0.5 mm to 1.5 mm smaller than the front rubber roller. However, for V-drawing, the diameter should preferably be larger than the front rubber roller. If old rubber rollers are used, the degree of rubber aging will be different, resulting in inconsistent hardness of the rear rubber rollers. As a result, the uneven yarn weight will increase and the spindle difference will increase. At the same time, changes in the friction force boundary will also easily cause hidden hard heads and hidden mechanical waves .
Response measures: The lower rubber roller grade is slightly lower, and the rubber roller with a slightly higher hardness and a smaller diameter can be selected, except for V-shaped drafting.
Apron selection
The rubber ring selection generally grasps the principles of soft upper and lower hard, soft outer and inner hard, and loose and tight. The use of new and old methods in order to reduce the maturity period. The one-sided emphasis on the cycle and the requirement for wear resistance, so when choosing the rubber ring is often based on the principle of thick and hard, resulting in asynchronous operation of the upper and lower rubber rings, a pause.
Response measures: Select the size of the aprons according to the type of spinning, the type of pin, the type of pressure and the amount of pressure. Pure cotton is generally thinner and softer, while chemical fiber is generally thicker and harder, but we must pay attention to the top and bottom collocation. The total thickness should not exceed 2 mm. Special attention should be paid to the pressure of the leaf spring. Due to the lack of elasticity and hard pressure, the circumference of the rubber ring should be appropriately large.
Fat selection
The problem of oil and fat is the problem most easily ignored by enterprises. In fact, many companies use grease incorrectly and should use extreme pressure lithium-based greases as required, but many companies use ordinary lithium-based greases. The main reason is that ordinary lithium-based greases are not resistant to high temperatures and easily melt. Due to the extremely strong permeability of oil stains in the rubber, the molecular movement on the surface of the rubber roller is also accelerated, the heat resistance of the rubber roller is weakened, and a large amount of static electricity is generated on the surface. The point is that many companies fail to realize this, and adopt other methods to solve the problem of circumvention, the effect is not obvious, wasting manpower and material resources.
Response measures: Select No. 3 extreme-pressure lithium-based grease, add it frequently, add less, and enterprises with conditions can join imported grease.
Selection of rubber roller bearings
Many companies use the same bearings when using aluminum liners and double-layer rubber rollers, but this is completely wrong. Because the aluminum-lined rubber roller is lined with metal aluminum, it is easy to be damaged by friction and needs more lubrication than the double layer, so the gap should be larger than the double layer. In this way, the generation of mechanical waves and eccentricity can be avoided.
Response measures: Have a correct understanding of aluminum-lined bearings and double-layer bearings, eliminate the one-sided view that the smaller the gap, the better the quality. Aluminum-lined and double-layer bearings use different types of upper roller bearings.
