Blow molding injection

Injection, blow molding, and extrusion and other conventional methods... 

Energy and bottle An interesting historical (1950s) example is the small injection blow molded whiskey bottles that were substituted for glass blown bottles in commercial aircraft continues to be used in all worldwide flying aircraft. At that time, just in USA, over 500 x 1012 Btu or the amount of energy equivalent to over 80 x 106 barrels of oil was reduced. 

GFRP tolerandng glass fiber reinforced plastic IBM construction solutions injection blow molding... 

Polyethylene terephthalate is injection blow molded to make water and carbonated drink bottles, and other liquid food packages. High stiffness, excellent clarity, and good resistance to carbon dioxide permeation are the principal attributes of these bottles. We carefully control molding conditions to promote transparency and surface gloss, which are prized for food... 

Describe both the extrusion blow molding and injection blow molding processes. Why would one method be chosen over the other ... 

How is orientation introduced into an injection blow molded part Compare this to orientation in a stretch blow part ... 

Injection blow molding that employs injection molded test-tube shaped preforms or parisons... 

The major difference between injection and extrusion blow molding is the way the soft hollow tube (called a preform or parison) is made. In injection blow molding, two different molds are used. One mold forms the preform and the other mold is used in the actual blow-molding operation to give the final shaped article. In the molding process, the softened material preform, from the preform mold, is introduced into the blowing mold and blow-molded to... 

Injection blow molding is typically used to produce smaller articles, generally with a total volume of 500 mL or less. Because two molds are used, there is little waste material that must be recycled and there is no bottom weld joint. It allows the production of small articles that at times are very difficult to manufacture in any other way. 

The multilayer film is formed by injection molding, co-injection blow molding, co-injection stretch-blow molding or co-extrusion blow molding techniques. 

Blow molding is rather difficult and limited to the direct blow molding process, because of the rheologic characteristics. For the same reason the injection blow molding process does not work. Tradenames appearing in the references are shown in Table 4.8. 

In injection blow molding, a parison is injection molded onto a core pin the parison is then rapidly transferred via the core pin to a blow mold, where it is blown by air into an article. This process is applied to small and intricate bottles. 

Injection blow molding of polycarbonates produces an assortment of containers from 20-L water bottles and 0.25-L milk bottles to outdoor lighting protective globes. 

Injection blow molding can be used to convert polystyrene into bottles, jars, and other types of open containers,... 

Most PET botdes are produced by injection blow molding (71) the resin over a steel-core rod. The neck of the botde is formed with the proper shape to receive closures and resin is provided around the temperature-conditioned rod for the blowing step. The rod with the resin is indexed to the mold, and the resin is blown away from the rod against the mold walls, where it cools to form the transparent botde. The finished botde is ejected and the rod is moved again to the injection-molding station. This process is favored for single cylindrical botdes, but cannot be used for more complex shapes such as botdes with handles. 

Injection blow molding. Injection blow molding, depicted in Fig. 3.60 [25], begins by injection molding the parison onto a core and into a mold with finished bottle threads. The formed parison has a thickness distribution that leads to reduced thickness variations throughout the container. 

The advantages of injection blow molding over extrusion blow molding are ... 

In the injection blow molding process, the parison is formed by injection molding of the preshaped parison onto a steel rod, as shown in Fig. 14.18. The rod with the molded thread already completed is moved to the blowing station, where the article is inflated free of scrap. The parison thickness distribution is determined in the injection mold without the need of further control. Some axial orientation is introduced during injection, resulting in an article with partial biaxial orientation. 

Fig. 14.18 Schematic of the three-position injection blow-molding rotary machine. The third position is easily accessible for removing the blow-molded article. [Reprinted by permission from Modem Plastics Encyclopedia, Vol. 53, McGraw-Hill, New York, 1976-1977.]...

Parison cooling is an integral part of the process that has been treated by a number of researchers (103-105). The principles are based on contact solidification without deformation, as discussed in Chapter 5. A special complication is the frictional heat generation in injection blow molding between the rod and the parison. 

PET s broad range of properties make them ideal replacements in certain applications for such metals as die-cast aluminum or zinc also in thermoset switches, relays, sensors, etc. Applications include packaging (particularly stretched injection blow molded beverage bottles and film), appliances, electrical/electronics, etc. PET finds applications in such diverse end uses as fibers for clothing, films, botdes, food containers, and engineering plastics for precision molded parts.118-120 A wide range of applications is possible because of the excellent balance of properties PET possesses and because the degree of crystallinity and the level of orientation in the finished product can be controlled. 

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