Medical bottles are one of the largest medical plastic products produced and sold. With the rapid development of the domestic medical industry, the amount of domestic pharmaceutical bottles will show a substantial increase. In this regard, domestic hollow equipment manufacturers should take this as an opportunity to grasp the development trend of plastic bottles, research and development of new high-efficiency, high-performance bottle molding equipment, and strive to shorten the gap with the international advanced technology and equipment.
Main molding equipment
Plastic bottle hollow molding equipment according to the different molding methods, can be divided into three types: extrusion blow molding machine, injection blow molding machine, and "squeeze - pull - blow" or "Note - pull - blow" molding machine. Extrusion blow molding and injection blow molding machines are mainly used for the production of pharmaceutical small and medium-sized plastic bottles. The "squeezing-pulling-blowing" or "injection-pull-blowing" molding machines are used for the production of large-sized bottles. At present, the largest number of plastic bottle manufacturers in China are extrusion blow molding and injection blow molding machines.
Extrusion blow molding machine
The cost of extrusion blow molding machinery (including blow molds) is low. For example, when molding the same product, the cost of blow molding machinery is approximately 1/3 or 1/2 of the injection molding machinery, and the production cost of the product is also relatively low. low. Because the parison is molded under low pressure through the extrusion head and blown under low pressure (mostly 0.2~1.0 MPa), the residual stress of the product is small, and it is resistant to stretching, impact, bending and environment, etc. Various strains have higher performance and better performance. Since the blow mold consists of only the female mold, the wall thickness of the bottle body can be changed by simply adjusting the gap of the die mouth or the extrusion conditions. In addition, since the sliding bottom module can be set on the blow mold, the design flexibility of the bottom shape of the bottle body is greater. Extrusion blow molding can form complex, irregular and monolithic products, and is therefore more suitable for forming rigid plastic bottles of HDPE and PP raw materials.
2. Injection blow molding machine
Injection blow molding machine is mainly used for processing medical bottles of HDPE and PP raw materials. Small plastic bottles molded with injection blow molding equipment are generally welcomed by pharmaceutical manufacturers. Due to the injection blow-molded bottle body during the molding process, the nozzle of the device can inject the bottle mouth, thus ensuring the precision of the bottle mouth. By mechanically mandrel-blown bottles, the dimensional accuracy of the plastic bottle body is guaranteed.
Injection blow molded medical bottles can be processed using a one-shot 2-station or 3-station injection blow-molding machine. Since the 2-station injection blow molding machine lacks a dedicated removal bottle and cooling station, it is difficult to achieve automatic counting and packaging, resulting in a production efficiency of less than 3 stations. Therefore, in practical production, more applications are 3-station machines. The three stations of the machine are distributed in an equilateral triangle with an angle of 120°. The first station is an injection molding station, the second station is a blow molding station, and the third station is a bottle removal and cooling station. The three stations can be operated at the same time. The production efficiency is high and the cycle is short. It can be automatically counted and packaged with the conveyor belt to truly achieve “no-man's hand contact†in the whole process of production of medicinal plastic bottles, thus ensuring the hygiene of the products. Injection blow molding machines cannot form products with complex shapes, and the molded bottles have a small volume (usually 10 to 300 ml). However, due to the high smoothness of the bottle mouth of the injection blow molded bottle and the uniform thickness of the wall of the bottle, especially the sealing performance between the bottle mouth and the bottle cap, it can prevent the volatilization of the drug gas and the external gas in the plastic bottle. The permeation performance requirements of the bottle, so that the bottle is fully in line with the special requirements of pharmaceutical packaging. The State Drug Administration, as early as the "Ninth Five-Year Plan" period, proposed to use injection blow molding to produce high quality plastic medicine bottles. At present, China has imported more than 40 injection blow molding medical bottle production lines from abroad, with a total production capacity of about 700 million per year.
3. "Note - pull - blow" molding machine
"Note - Pull - Blow" PET, PP bottle (for liquid drug filling) molding machine is divided into one-step and two-step two models. The 1-step model is a high-efficiency device that can continuously perform processes such as injection of parisons, heated parisons, stretched parisons and blow moldings, and demolding of molded products on the same equipment. According to the molding process, the one-step model is divided into two types of machines: three stations (represented by Japan's Aoki Corporation) and four stations (represented by Nissei, Japan). The main difference between the two is that: 3 stations refer to the injection of parisons and heated parisons in one process, and 4 stations means the injection of parisons and heated parisons in 2 processes. The one-step model will not cause secondary pollution of the product, and the product identity is good. In spite of the high price, in order to achieve the high cleanliness requirements for pharmaceutical bottles, domestic pharmaceutical manufacturers have tended to use one-step injection-pull-blowing bottle-forming machines in recent years. Therefore, on the basis of digesting and absorbing foreign advanced technology, some domestic equipment manufacturers have stepped up the development of a one-step model that can replace foreign equipment and achieved certain results.
The two-step model means that the injection and stretch blow processes are performed separately by two separate machines. The first step: injection molding a tube from an ordinary injection molding machine. The bottle head (bottle mouth, thread) of the tube blank is molded. The second step: The tube blank is placed on a honeycomb heater or an automatic circulating heating belt to heat and temperature, and then moved to a blowing process and stretch blow molded with compressed air. The smoothness of the bottle mouth, good sealing, rapid product development, low mold cost and lower cost are the advantages of the two-step model. However, due to the step-by-step injection molding of blanks and blow molding, product identity is poor, and it is easy to transmit pollution, making it difficult to pass the bacteria test.
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