Injection stretch blow moulding is the process of manufacturing high quality and very high clarity bottles. Pdf modelling of the injection stretch blow moulding of pet. Pet containers are manufactured in a singlestage or two. During the blow molding production process there are many variables manufacturers must pay attention to. This biaxial stretching of material increases the tensile strength, barrier properties, drop impact, clarity, and top load in the container. The perform is typically preheated then stretched in the axial direction and blown into its final shape by a stretch blow molding machine. Molten polymer flows into the injection cavity via the hot runner block. The process is divided into three sectionsi injectionii blowingiii ejection 20. When these preforms are produced, they include the necks of the bottles as well as threads, known as the finish. Read this guide to understand all about the technology, how it differs from injection molding and the companies that offer blow molding services. Ottmar brandau has written and edited 4 books for the pet industry. What follows is an explanation of the extrusion blow molding process and how it differs from injection molding.
Simulations of various stretch blow and blow moldings of axisymmetric pet bottles has been. How extrusion blow molding differs from injection molding. Stretch and extrusion blow molding services microdyne. Pdf parameter study of stretchblow moulding process of. These tips are separated for both single and twostage stretch blow molding. The preform is then pre heated before being held inside two halves of a mould. Injection stretch blow molding for pet after being out of the injection stretch blow moulding market for over 10 years, we are back with a new machine which is going to revolutionize the sector. Mar 25, 2016 this has two main different methods, namely singlestage and twostage process. Injection blow molding article about injection blow molding. Stretch blow molding is the common method for producing soda bottles.
Within the injection blow molding process, the material is injection molded. Stretch blow molding machine is newly designed and reformed on previous experiences of our manufacture with great development on the aspect of 2in1 cylinder structure, new model moldclocked set and automatic voltageregulating set of temperature controller of reheating unit. In the stretch blow molding sbm process, the plastic. The two stage injection stretch blow moulding process duration. The iterative nature of the blow molding process lends itself to production variables. Stretchblow molding machine is newly designed and reformed on previous experiences of our manufacture with great development on the aspect of 2in1 cylinder structure, new model moldclocked set and automatic voltageregulating set of temperature controller of reheating unit. For blow molding the prediction of material behavior during clamping and inflation will be. Plastics 001 injection blow molding plastics 001 injection blow molding. Pet books blow molding advisors at apex container tech inc. The parison is a tubelike piece of plastic with a hole in one end through which compressed air can pass.
After each defect an explanation gives more background into why. Stretch blow molding can be a 1step or 2step process depending on the requirements of the package. When the preform is in the mould it is then inflated using. The preform then undergoes the stretchandblow process. Overhaul in blowtech, usd40,000 only, then start the other 10 years life, it is a service from blowtech. The rapid guide to perfect pet bottles blow molding. A machine with electromechanical process and movements and hy. Apr 19, 2015 in 1938, they produced a blow molding machine, which they then sold to the hartford empire company, kicking off the commercial use of blow molding. Simulation of the stretch blow molding process of pet bottles. The injection molding machine consists of the injection unit and the clamping unit, and their features are described below. Stretch blow molding has been used since the early 1970s and has grown in existence with the primary use for making carbonated beverage bottles. Injection stretch blow moulding is used for the production of high quality containers. The 2step process, similar to that of injection blow molding, begins with an injection molded perform. Injection blow molding industrial processes plastic.
If you blow air into a plastic tube that is closed on all sides except the point at which the air enters, the tube will. In the blow molding process getting the mold perfect is only part of the battle. Pdf on apr 27, 1997, fabrice schmidt and others published experimental study of the injection stretchblow molding process find, read and. In this video you can see how the injection stretch blow moulding process works. Stretch blow molding is the common method for producing pet bottles. Comar seven manufacturing and distribution locations and employs rigid plastic packaging technologies including injection molding, injection blow molding, injection stretch blow molding, and extrusion blow molding which are complemented by a suite of value added service offerings. In general terms, blow molding is the process in which a hot parison or preform is inflated within a closed mold to impart the shape of the mold cavity. Injection blow moulding first a parison is injection moulded and. Injection stretch blowmoulding moulding process spectra. Injection blow molding, as its name would suggest, is a combination of plastic injection molding and blow molding that creates hollow, thinwalled plastic containers that are smaller and does not have handleware. It is faster than extrusion blow molding, and offers higher precision. Blow molding modified extrusion and injection molding process characteristics hollow thinwalled parts of various sizes high production rates low cost for.
In the ibm process, the polymer is injection molded onto a core pin. Stretch blow molding is best known for producing pet bottles commonly used for water, juice and a variety of other products. Iv too low, preform too hot, low level crystallinity in preform. Silgan plastics technologies injection stretch blow molding. Troubleshooting tips for injection blow molding used. This is a troubleshooting guide that should be in every operators toolbox or on hisher smartphone or tablet.
Apr 09, 20 injection blow molding the injection blow molding is used for the production of hollow objects in large quantities. Injection blow molding an overview sciencedirect topics. This strength and barrier properties are a result of the orientation in the axial and hoop direction. Pdf numerical study of stretchblow molding of pet bottles. Extrusion blow molding ebm is a manufacturing process whereby plastic is melted and extruded that is, expelled to form a shape into a hollow tube. Continental can was issued a patent for a continuous extrusion blow molder in 1950. One of the major advantages of stretch blow molding is the ability to stretch the preform in both the hoop direction and the axial direction. Simulative design and process optimization of the twostage stretch.
Apr 30, 2015 therein lies another difference between injection molding and blow molding. How does injection stretch blow moulding process work. In this updated handbook, ottmar brandau introduces the technology of stretch blow molding, explores practical aspects of designing and running a production line, and looks at practical issues for quality control and troubleshooting. It is also used for forming glass bottles or other hollow shapes. In this research work, numerical modeling of the stretch blow molding sbm of polyethylene terephthalate pet bottles is studied by finite element method fem. The bottle is then indexed to the next station and ejected. Apr 07, 2010 injection stretch blow 1step this process is almost entirely dedicated to pet and more recently, pp applications. On 125 pages 31 common defects of pet bottles are analyzed and tips given to solve them. Blow molding moulding is a specific manufacturing process by which hollow plastic parts are formed and can be joined together. Singlestage process is again broken down into 3station and 4station machines in the twostage injection stretch blow molding isbm process, the plastic is first molded into a preform using the injection molding process. Molten polymer flows into the injection cavity via the hot runner block, to produce the desired shape of the preform with a mandrel the core pin producing the inner diameter and the injection cavity the outer.
Injection stretch blow molding isbm involves molding the plastic into a preform using the injection molding procedure. This hybrid machine featured high precision neck dimensions with tolerances as tight as glass bottles. Introduces asbs product lineup, including the one step stretch blow molding machine, 1. Blow molding modified extrusion and injection molding process characteristics hollow thinwalled parts of various sizes high production rates low cost for making beverage and food containers. Injectionstretch blow molding figure 4 is a twostage process. These preforms are then cooled and put through the blow molding process. The process is very similar to injection blow except for two areas.
Implement a quality assurance syste stearate is identifies any trends and allows for develop and publish the quality standards change to become apparent, record changes in continued on page 2 introduction injection blow molding incorporates particular characteristics and advantages over other. The hot material, still on the core pin, is then indexed to the blow molding station where it is blown into a bottle and allowed to cool. Stretch blow moulding is a widely used technique e. In a stretch blow moulding process a hot preform of. Stretch blow molding, third edition, provides the latest on the blow molding process used to produce bottles of the strength required for carbonated drinks. Within this process the preform is produced by injection molding and afterwards blown by a combined stretching and blowing process to the designated bottle. Pdf experimental study of the injection stretchblow molding. Pet containers are manufactured in a singlestage or twostage process. Difference between extrusion blow molding and injection blow. The stretch blow molding book is an ideal text to teach newcomers to the industry the basics of the material, process, and machinery. In general, there are three main types of blow molding. The plastic is melted and then injected into a mould to form a preform. Injection stretch blow moulding technology youtube.
The main applications are bottles, jars and other containers. Jan 24, 2015 in this video you can see how the injection stretch blow moulding process works. Injection blow molding blow molding blow molding process. When preforms are underdried or overheated during injection their iv may drop significantly and they may blow off the stretch rod. The beginning of industrial blow molding can be said to have started in 1953 with the. Injection stretch blow molding is used for bottles that need higher strength and good barrier properties. Difference between injection molding and blow molding. Pdf a 2d isothermal finite element simulation of the injection stretchblow moulding isbm process for polyethylene terephthalate pet containers. Publishers pdf, also known as version of record includes final. First two steps involved in injection stretch blow molding 7 injection stretch blow molding. Crystal clear glassclear presentation of the product.