Technical article: plastic bottle blow molding process, blocking and container Magazine - Dongguan Fukang plastic products
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Technical article: plastic bottle blow molding process, blocking and container magazine

  • Release date: September 7, 2017 16:48 times of reading: 444
  • Blow molding dates back to at least 1890 when it was used to produce Celluloid Baby Bells. From that moment on, many companies have tried countless methods to produce blow molded plastic products of various materials. The first polyethylene bottle was blown in December 1942. The rest is history: the United States currently produces between 3 and 40 billion dollars Plastic bottle The number of people is growing every year. To pass on the excellent history of the plastics industry in 1972, those who read this article may refer to the history of the United States published by Harry Dubois, Kanas books, Boston, Massachusetts, ISBN 0-8436-1203-7.


    There are basically four types of blow molded plastic bottles, pots and cans used in production. The four types are extrusion blow molding, injection blow molding, stretch blow molding and thermal and blow molding. Extrusion blow molding is perhaps the simplest type of blow molding, in which plastic material heat pipes are trapped from extruders and water-cooled moulds. Once the mold is closed, air is injected through the top or neck of the container; It's like a man blowing a balloon. When the thermoplastic material blows up, the mold material now in contact freezes and the vessel wall maintains its rigid shape. There are various types of shuttle, reciprocating and wheel style machine extrusion blow bottle production. Shuttle buses or reciprocating machines can be used with a grinder that is most efficient for mass production of some resins for high, medium and small batch production.


    Injection molding parts and parts of the injection molding injection blow molding. With injection blow molding, the thermoplastic material is the first cavity injection inserted on the blow dry, used to create the neck and build the gram weight. The injected material is then taken to the next station on the machine, where it explodes into the finished product container above the extrusion blow molding process.


    Injection blow molding is generally suitable for smaller containers and absolutely no handleware. Extrusion blow molding allows a wide variety of container shapes, sizes and neck openings, as well as the production of handleware. The squeeze blow container can also have a very wide range. By adjusting its gram weight, the blow injection container usually has a set of gram weight which cannot be changed unless a new set of striking stems is established. Extrusion blow molds are usually much cheaper than injection blow molds and can be produced in a very short time.


    Many people have heard about stretch blow molding together. Bottles are usually used for water, juice and a variety of other products. There are two processes for stretch blow molding container calculation. In one process, the injection mold is involved in the preform and then transferred within this machine to another station where it blows and then ejects from the machine to the machine. This type of machine is often referred to as injection stretch blow molding (probability), and usually requires a lot of running to prove a lot of money to build a preform injection mold, and then the blow mold completes the blow container. This process is used for high capacity projects, such as wide mouth peanut butter tank, narrow mouth mineral water bottle, liquor bottle, etc.


    The other blowing process is often referred to as reheat and blow (RHB). In this process, the preform is an external supplier of injection molding. There are companies that produce large quantities of these stocks of preforms on a commercial basis. The factory bought the preform and put it into a relatively simple machine, reheats, so that it could be blown down. The value of this process is mainly that the blowing company does not purchase injection molding equipment to blow a specific container, as long as the preform is obtained from the preform manufacturer of the stock. This process also allows access to an existing large catalog of preforms. Therefore, the main cost is now for blow molding mold, which is much cheaper than the required bottle blank injection mold.


    However, there are some drawbacks to this process. If you can't find the stock of preforms, it will blow you to think that you have to either buy injection molds and some containers for your own private mold preforms for injection molding, or you will have to give up the process. Handleware is not developed at this stage for any type of stretch blow molding. The stretch blow molding process also provides the ability to produce fairly lightweight containers with very high impact resistance and, in some cases, excellent chemical resistance.


    Whether the injection stretch blow molding process or reheat and blow molding processes are used, an important part of the process is the mechanical stretch of the preform during the injection molding process. Stretch the elastic rod of the preform. This stretching movement helps to increase the impact resistance of the container and also helps to produce a very thin thin-walled container.


    The extrusion blow molding process allows the production of bottles in a wide range of materials, including but not limited to: HDPE, LDPE, PP, PVC, barex ®、 Calculation method, K resin, p.e.t.g. and polycarbonate. As noted above, a variety of shapes (including handleware) are available on both scale and neck. Injection blow molding allows the production of various materials in bottles, including but not limited to: HDPE, LDPE, PP, PVC, barex ®、 And polycarbonate.


    In addition to the drawing blow molding calculation method mentioned above, the number of other materials has been blown, including the drawing of polypropylene. As time goes on and technology advances, more materials will be drawn and blown by themselves, as their molecular structure is changed to adapt to this process.


    The decision on which process will be adopted is based on the appearance required (clear or not), whether chemical or shock resistance is required, and the cost-effectiveness relationship required. The final selection of materials and processes is also based on the cost and size of the tools involved in the production run. Some materials borrow themselves for certain types of decoration than others and some types of decoration, excluding some others.

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