Blow molding injection stretch

Argarwal, R, Ellington, D., and Gallucci, R. (2008) New impact resistant polyester blow molding compositions with excellent ethanol, fuel barrier properties. Society of Plastics Engineers (SPE) ANTEC Proceedings, 923-928. 

C Yang, W Chen, C., and Lin, K. (2007) Influence of injection molding parameters on one-stage injection stretch blow molding. SPE ANTEC Proceedings, 923-927. 

Dempsey, D. and Atkins, M. (2008) Property verification of thermoplastic elastomer bottles produced from custom designed extrusion. SPE ANTEC Proceedings, 1964-1968. 

Greene, J. (2013) PHA biodegradable blow-molded bottles compounding and performance. Plastics Engineering, 69 16-21. 

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Injection stretch-blow molding may be performed on a single one-stage machine in sequence or on two independent sequential two-stage machines. PET carbonated beverage botties are usually produced by injection stretch blow molding. 

Soft-drink bottles made from poly(ethylene terephthalate) (PET) are usuady made by stretch-blow mol ding in a two-step process. Eirst, a test-tube-shaped preform is molded, which is then reheated to just above its glass-transition temperature, stretched, and blown. Stretching the PET produces biaxial orientation, which improves transparency, strength, and toughness of the botde (54,56). A one-step process is used for many custom containers that are injection stretch-blow molded. 

Injection-production wells, in soil and ground water treatment, 25 835 Injection stretch blow molding, of food packaging, 18 50-51 Injection wells, 18 613... 

Single-screw extmsion in general is the most important conversion process for biodegradable plastics. Only injection-molded and injection-stretch blow molded rigid containers like closures and bottles are not produced by a continuous extmsion process. 

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

A process that greatly improves blow molded product properties is that of injection stretch blow molding, which introduces biaxial orientation in crystallizable polymers. There are two variants of this process involving the molding of a preform as the first step. The thermomechanical paths of the two process variants are shown in Fig. 14.19. In the... 

Fig. 14.19 Thermomechanical histories of the two variants of the injection stretch blow molding process (a) the two-step, and (b) the less common one-step.

Fig. 14.20 Schematic representation of the injection stretch blow-molding process. Step (1) producing preforms may be carried out in different location from the stretch blow molding process. [Reprinted by permission from Schmidt et al., Experimental Study and Numerical Simulation of the Injection Stretch/Blow Molding Process, Polym. Eng. Sci., 38, 1399 (1998).]...

Two basic methods are used in this process to deliver material to the processing units. These are extrusion and injection. In the next step, the preformed material is expanded to form parison. There are many commercial variations on this basic technique some of which include continuous-extrusion-blow-molding, coextrusion-and-sequential-blow-molding, and injection-stretch-blow-molding. Both extrusion and injection molding are the subjects of later discussions below, we will concentrate here on the parison formation, its processing, and the related effects. 

Figure 12.13 Injection stretch blow molding, (a) injection molding of parison, (b) stretch blow molding of container (reprinted with permission from [1 ])...

Extrusion stretch blow molding begins with an extrusion blow molded preform injection stretch blow molding begins with an injection molded preform. Injection stretch blow molding is the method of choice for most PET bottles, including all soft drink bottles. It is also used for PEN bottles and some PP bottles. Extrusion stretch blow molding is used for some PVC bottles. 

ISBM injection stretch blow molding K Kelvin... 

In contrast, PEN meets the requirements, but more complex forming techniques are needed. PEN bottles cannot be produced by simple extrusion blow molding. PEN requires the use of the more complex two-step injection stretch blow molding process. In this process, a preform is first injection molded and then stretch blow molded to produce the final bottle. This is the same process used to produce bottles of the related polyester, PET. 

Injection stretch blow molding (ISBM) is an extension of injection blow molding with two modifications (a) the preform is significantly shorter than the bottle and (b) a stretch rod is used to stretch the preform in the axial direction. This process became known in the blow molding industry with the introduction of plastic or PET soft drink bottles. 

Injection vs. extrusion/blow-molding For clarity, processmg factors go hand-in-hand with the choice of a clarifier. Relatively thick-walled, injection-molded cPP homopolymer or random copolymer parts have hmits on the clarity they can achieve, perhaps down to 7%-10% haze. Only thin extruded or injection-stretch blow-molded (ISBM) cPP may achieve lower haze levels (l%-2%) that allow it to compete with PET. For one-stage ISBM of random copolymer PP, for example, newer clarifiers may work better than sorbitol-based agents... 

PET Bottles Injection/Stretch Blow Molded in Single Stage, PM E, p. 10, Jan. 1989. 

The intermittent extrusion blow molding process is generally used in the fabrication of large volume articles (e.g., > 20 liter bottles). An accumulator is employed to increase the parison extrusion speed (see diagram below). After the mold closes there is no additional mold movement. Refer to Injection Stretch Blow Molding. 

The process steps involved in injection stretch blow molding are illustrated by the series of drawings in Figure 1. The advantages of this process are ... 

Table 4.7 presents selected ecoprofile information for production of bottle-grade PET resin, PET injection stretch blow-molded bottles, and PET film, packed... 

Processing methods extrusion, injection molding, blow molding, thin-wall injection molding, injection stretch blow molding, sheet extrusion, blown fihn, cast film, rotomolding, and thermo-forming... 

The nucleating agent is not necessaiy or may even have a negative effect in processing with high external strains such as fiber spinning and injection-stretch-blow-molding of bottles. ... 

Bottles and pre-forms were manufactured by injection-stretch-blow-molding from a composition comprising polypropylene and an inorganic non-soibitol nucleating agent (aluminum hydroxybis 2,2 -methylenebis[4,6-di(tert-butyl)phenyl]phosphate)." ... 

In blow molding, bottles or jars are produced by blowing, with air, a molten previously formed part. There are three types of blow molding extrusion blow molding (EBM), injection blow molding (IBM), and injection stretch blow molding (ISBM). 

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