Positive pressure plastic thermoforming mould installation and maintenance Union star packaging machinery

Plastic thermoforming technology on domestic production of plastic cup began about in the late 1980 s, after more than ten years development, is now at the peak stage. No matter from the device ( Sheet production line, hot molding machine & ndash; Cup machine, mold, printing press) Or the technology is ripe. From raw materials to products generally divided into three stages: usually used in the production of plastic cup materials mainly is: polystyrene ( PS） And polypropylene ( PP) , PVC ( PVC) , polyester ( PET) , ABS, BOPS, etc. According to the packaging requirements of different customers, can be divided into the single layer of all sorts of color HIPS, CPS ( Transparent PS) , PP, PVC, PET, ABS, BOPS, and composed of one or more material multi-layer composite structure. Such as those with high separation performance of plastic cup or requires at least two materials five layers co-extrusion composite structure. It is three stages: 1. Extrusion of plastic materials this step is to plastic raw materials through & other; Plastic sheet production line & throughout; A continuous plastic sheet. Its general form is: equipment - crystallization and dry mixing system - a single or multiple extrusion machine - net changer - - T melt pump head - three-roll calender device - cutting edge device - traction device - the loading device - curl winding device. Made of plastic sheet thickness in 0. ２５mm- Between 5 mm, width is about 300 - mm １４００mm。 2. Molding hot forming is a plastic cup production process of plastic material. Hot forming is a kind of special plastic processing technology. Its characteristic is to sheet is heated to high elastic state, and then by compressed air pressure and mould pre-stretching device makes sheet laminating mould surface, cooling, finalize the design, products resulting from the shearing. Because of the molding die usually need air pressure is positive pressure ( 0. 4 - 0. 8MP） , so the cup process called positive pressure hot forming, the positive pressure moulding mold used in the production process called & other; Positive pressure plastic thermoforming mould & throughout; 。 3. Decorate adornment also is to use print or stick mark method was carried out on the plastic cup appearance beautification. Production & other; Disposable plastic cup & throughout; The positive pressure of thermoforming mould is used more by forming and blanking structure. Domestic hot molding equipment and mould need to continuously improve and improve both imported and domestic & other; Positive pressure thermoforming moulds & throughout; , is not very good solve the problem of lubrication and seal. Mold inside bad lubrication products will cause pollution. So think in terms of cleaning and maintenance should be free of lubrication materials, such as free of lubrication bearing and guide sleeve. Homebred mould is the correct selection of materials and the improvement of machining accuracy. Due to cost competition pressure, blade, cutting board, the pressure plug rod, cavity choose the inappropriate material with low performance or without heat treatment or heat treatment strength is insufficient, replaceable cavity without hard anodic oxidation, sandblasting processing ( Such as aluminum mold) , some machining accuracy, Concentricity, verticality, roundness) Is not enough, to a certain extent, reduce the service life of the die, increased the difficulty of repair and maintenance in the process of production. In addition, most of the domestic hot into machine without mould device of automatic tuning. Less experienced parallel manual mode is difficult to guarantee lower die body, accelerate the cutting board and knife edge wear and tear, reduce the life and precision of the mould should be, also reduces the production efficiency.