Development of bottle blowing machines made in China
Blow molding hollow thermoplastic products is to create a common approach, the main product is the hollow tube membrane and the container. Bottle blowing machine can be pre-heated molding products to plastics, blow molding and then into the mold, this method is mainly used for high speed BOPP production of PET bottles and bottle production, that is, two-step process; blow molding and injection molding can also be process of combining into one injection stretch blow machine, which is the production of PET containers in the common way; blow molding process can also be combined with the extrusion process, extrusion blow molding equipment to adapt to a wider range, able to produce products more for the rich, multi-layer composite films and products, including various types of polyolefin hollow container, widely used in food, pharmaceutical and cosmetics industries.
Hollow container forming machine
Blow molding step and two-step process, mainly used for molding hollow containers PET and BOPP. Both have their own characteristics, are widely used.
PET bottle blowing machine preform is heated by means of transmission is divided into two kinds of rotary and linear. Rotary bottle blowing machine capacity, high speed, design complexity, the price is higher.
Temperature control and uniformity is directly related to plastics, blow molding products is the key to success. Mold and hot runner design and precision, but also determines the merits of product quality.
At present, China for PET injection stretch blow bottle production equipment is basically dominated by imported products, especially in the high-speed and large volume production, the domestic equipment can not compete. Cold aseptic filling technology with the rise of a new round of blow molding machine market in turn opened the battle.
Extrusion blow containers of materials, production equipment, adaptable, can produce PE, PS, PVC, PC and other materials of container, the product of a wider application areas. Market 3 / 4 of the blow molding products are manufactured by the extrusion blow molding. Extrusion blow molding method can produce a few ml bottle of eye drops, and can process more than 1000L-ton tray or bucket.
At present, China extrusion blow container production equipment has been completely meet the need. However, the current development of China's extrusion bottle blowing machines from the function is still not perfect, especially those with multiple complex functions of the device can not produce, such as widely used in liquid pharmaceutical packaging bottle - fill - seal triple equipment.
Multi-layer composite film production equipment
Production of the extrusion blow molding process to produce plastic film is another category of products.
Developed countries about 40% of plastic packaging films are produced using extrusion blown film co-extrusion, China is lower. Chinese film production ever more complex preclude the use of single-layer film composite dry or wet process, but the unstable products due to quality, the use of adhesives poor health, high cost, thus gradually being replaced by multi-layer co-extrusion film.
Multi-layer composite technology is the use of multiple extruders in the molten state of the material by a special extrusion head to form a new functional thin film, simply preclude the use of a multi-processing operations can be made more function of composite films compared to other composite technology can save about 30% of production costs. This film can be configured in accordance with the requirements of different user groups were to achieve the different barrier requirements and cost requirements.
Before the nineties, China's more to be produced using rotary head 2 to 3 layers co-extruded film, but with the development of three-layer packaging film gradually give way to 5 or even 7-layer thin-film layer. With this process, but this process is catalytic made the development of multi-layer blown film equipment
Multi-layer co-extruded blown film production equipment, a number of key technologies, die is one of the most important one. Plus-type die is the most commonly used die, with a short runner, layers can be any combination of temperature control, etc. alone. This die production has been the formation of some famous professional manufacturer, whether imported or domestically produced Chinese equipment, most of the need to introduce die. Introduction of key technologies and components, is a shortcut to China blow molding business development.
Equipment made in China, although the accuracy and reliability of the product and there is still a shortage of imported equipment, but its price advantage is imported production line can not match. It is by the high cost of domestic plastic processing machinery accounted for most of the domestic market, and may rely on this advantage to enter the international market.