The 1.45 kilogram class roving winder is currently the largest wind roving winder with the highest package volume and highest performance. It has solved the following key technologies in the development process: (1) Cam material and surface hardness treatment. The comprehensive performance of the winderless roving winder has reached the international level in the late 1980s and can completely replace similar imported machines. It has already promoted and applied 400 units in the country, saving more than US$6 million in foreign exchange for the country, which has played a catalytic role in the development of the Chinese glass fiber industry. Compared with traditional packaging technology, shrink packaging technology saves packaging cartons and reduces packaging volume. Each container reduces the weight of packaging cartons by nearly one ton, and it is easy to load and unload. This kind of packaging is welcomed by foreign customers. The packaging machine has been used in Tongxiang Boulders Glass Fiber Co., Ltd. and Shanghai DaGuan Glass Fiber Machinery Co., Ltd. It is expected that many domestic fiberglass plants will use this packaging machine to package export products. The results have been transformed into productivity, and there are already established manufacturers that can be promoted and applied. (2) Research and calculation of cam commutation curve. (3) Winding ratio. (4) guide yarn position. (5) Yarn feeder material. (6) winder electrical control technology. Technical and economic indicators: the yarn speed: 50 ~ 600m/min; line speed fluctuation: <1; package volume: 45kg; noise: <75dB; cable slot life:> 3a; service life of shuttle and guide wheel :> 3 months; service life of cable nozzle:> 8 months. 2. The roving heat-shrinking packaging machine is a plastic heat-shrinking machine that is sleeved on a non-twisted yarn and heated by hot air to make the plastic film shrink sharply in the length and width direction, tightly wrapped around the surface of the tube, and then cooled. Thereby constituting a flexible body packaging structure. The machine has a reasonable design, compact structure, reliable performance, low noise, easy operation and strong overall shape. Domestic polyethylene (PE), polyvinyl chloride (PVC) and biaxially oriented polypropylene (OPP) films can be used as heat-shrinkable packaging materials. After being packaged by the machine, the articles are protected against moisture, dust, contamination, and appearance. Product packaging grade, reduce costs, convenient transportation and storage. The main key technologies of this machine are: (1) Oven structural design: It uses good insulation materials and has high thermal efficiency. (2) Unit conveyor chain system design: The VS motor is continuously variable, and the line speed is automatically adjusted in the range of 1 to 7 m/min. (3) The choice of oven heating elements. (4) Design of hot air circulation: 3 groups of hot air circulation areas, the temperature deviation in the oven is controlled at ±5°C. (5) Selection of anti-blocking materials. (6) Selection of packaging film: According to the product requirements of users, choose the film thickness dimension specification. (7) Study on the sealing at both ends. Technical and economic indicators: (1) maximum package weight: 45kg; (2) maximum package dimensions: diameter 450mm×h450mm; (3) packaging speed; 4 to 5 packages/min; (4) package oven temperature: 20 to 180 °C (automatically adjustable); (5) Electric heating power: 31.5kW; (6) Hot air blower: 0.25kW3 sets; (7) Power consumption: 0.045kWh/45kg. The comprehensive performance of the winderless roving winder has reached the international level in the late 1980s and can completely replace similar imported machines. It has promoted and applied 400 units in the country, saving more than US$6 million in foreign exchange for the country, which has played a catalytic role in the development of China's fiberglass industry. Compared with traditional packaging technology, shrink packaging technology saves packaging cartons and reduces packaging volume. Each container reduces the weight of packaging cartons by nearly one ton, and it is easy to load and unload. This kind of packaging is welcomed by foreign customers. The packaging machine has been used in Tongxiang Boulders Glass Fiber Co., Ltd. and Shanghai DaGuan Glass Fiber Machinery Co., Ltd. It is expected that many domestic fiberglass plants will use this packaging machine to package export products. The results have been transformed into productivity, and there are already established manufacturers that can be promoted and applied.
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