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Calendering of fiber fabric in automobile silicone tube
High temperature silicone tube in the automotive application is also more and more, because the car in the process of driving will release a lot of hot gas, so the requirements for silicone will be high.
Oct 18th,2023
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In order to meet the requirements of different properties such as the strength and heat resistance of the silicone tube to adapt to different use environments and conditions, and to ensure the adhesion and compactness between the silica gel and the cloth layer, it is necessary to rub and paste the fabric and silicone rubber before the rubber tube is formed.
At present, the equipment used for hanging glue is generally four or three roller calender, and there are also relatively backward points that use the processing method of directly bonding the fabric with silicone rubber on the open mixer. Sometimes in order to ensure sufficient bond strength between the fabric and the silicone rubber, it is also necessary to soak the fabric with special adhesive treatment before calendering.
At present, the fabrics used are generally aramid cloth, Vinylon cloth, polyester cloth, glass fiber and so on.
Calender operation process description:
(1) Start the calender;
(2) Put the fabric and plastic film into the corresponding bench, set the main machine of the calender to turn forward, insert the fabric into each guide cloth position along the whole machine process until the winding stop, and then insert the plastic film into the guide roll after the calender through the laminating guide roller in the reverse direction to stop the calender;
(3) Strictly control the temperature of the drying roller (No. 1 roller 115±5℃, No. 2 roller 115±5℃, No. 3 roller 110±5℃, No. 4 roller 110±5℃) to ensure that the moisture content of the curtain before rolling meets the requirements of the regulation (1%). If the operation is interrupted, the curtain should be parked for no more than 4 hours after drying to avoid the curtain absorbing water;
(4) Adjust the roll distance of the calender according to the products produced.
(5) Proper control of the amount of glue. Small amount of glue (each roll ≤10㎏) frequently added to maintain a certain amount of accumulated glue between the roll distance, reduce thickness fluctuations;
(6) calendering roller temperature: silicone rubber adheres to the cold roller, the temperature of the roller in the calendering machine during the calendering process should be lower than the upper and lower rollers, and when the surface of the rubber material ripples or sticks to the roller, the roller temperature should be increased;
(7) The rolling speed should be controlled appropriately to reduce the stress relaxation of the rubber material and maintain the uniformity of thickness;
(8) The curtain expansion is controlled by the tension roller to ensure the width of the curtain;
