The actual making of the mold varies between blow molding and injection molding. Introduction plastic formation processmanufacture of bottles and blow molding process. The tairipro product classification contains homo polymer, random and impact copolymer which can be processed by injection, extrusion, blow and vacuum thermoforming. The main applications are bottles, jars and other containers. After the plastic has cooled sufficiently, the mold is opened and the part is ejected. This book, a guide to polyolefin blow molding, contains general information concerning materials, methods and equipment for producing high quality polyolefin blow molded products at optimum production rates. In extrusion blow moulding ebm, plastic is melted and extruded into a hollow tube a parison. Insert molding, overmolding, injection blow molding, transfer molding, compression molding. Processes to plastic bottle blow molding there are four different blow molding processes used to produce plastic containers and bottles. The stretch blow molding process does offer the ability to produce fairly lightweight containers with very high impact resistance and, in some cases, superior chemical resistance. Optimize resin management in extrusion blow molding. Polyolefins for blow molding polyolefins are the most widely used plastic for blow molding. Besides surface patterning, joining can also be integrated as a processing step during blow molding. It can be used to blow mold almost any type of plastics that can be injection molded.
Blow molding is the manufacturing process by which hollow plastic parts like bottles and containers are formed. Polyethylene extrusion blow molding process guide formosa plastics corporation, u. Automotive parts through extrusion blow molding ejecting a molten liquid plastic material into a preformed mold creates extrusion blow molded plastics. The topics covered in this training series include a wide range of extrusion blow molding information and common procedures. Throughout the plastics industry, moog experts work njunction with plastics processing sheet no 3. Automotive parts through extrusion blow molding western. The two halves of the mold are pressed together and air pressure is used to blow in the liquid plastic until it fully fills the preformed cavity conforming to the molds shape. At this point of the process this material is generally referred to as a parison, which is a round melted mass that will then be molded. With blow molding, temperature, type of plastic, pressurevelocity, and speed are as important as making the mold itself, while with injection molding, making the mold is the vast majority of the processabout 90% of it.
Blow molding design guideline blow molding design guideline 2 draft of part parting line this is determined by the shape of the part and will optimize blow ratios direction of pull determining this will eliminate undercuts dielock or require inserts draft guidelines a minimum of 1 per side 2 per side is recommended. Injection stretch blow 2step this process is also almost 100% for pet applications. Tubingprofile, sheet, film, blown film, overjacketing, co extrusion ram extrusion. 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. This is a batch process, involving a cyclic sequence of operations.
Extrusion blow molding lesson 3 extrusion blow molding. From water bottles to carrying cases for power tools, blow molding is a fast, efficient, and inexpensive way to manufacture many of the things we use every day. Blow molding extrusion blow molding is manufacturing process that forms hollow thermoplastics. The hardware is a standard, 24volt industrial pc, which eliminates any need for manufacturer. It is also used for forming glass bottles or other hollow shapes in general, there are three main types of blow molding. Plastic forming process where an extruded plastic tube is inflated with air inside a mold to form the final product. Silgan plastics technologies extrusion blow molding. It is used to made hollow parts such as plastic bottles. Silgan plastics is a leading manufacture of rigid plastic bottles, closures, and fitments in the food, personal care, healthcare, household, automotive and chemical markets. The processes utilizes preforms made on a standalone injection molding machine, stored and then reheated and stretch blow similar to the 1step process above. However, compared to extrusion blow molding, tooling costs on a cavity to cavity basis are higher, since blow molds, core rods and injection molds are all necessary to the process. Extrusion blow molding is a manufacturing process used to produce hollow parts that range in size from large septic tanks to small eyedrop squeeze bottles. Apex is involved in operatorengineer training, product development, plant audits and improvement programs, process troubleshooting, and new plant layouts and startups.
This is caused by the large number of molds and core pins required. In conventional metal processing, an additional processing step is. Extrusion blow molding ebm is the oldest of the various blow molding processes. 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. Extrusion blow moulding british plastics federation. 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. Ottmar brandau is principal of apex container tech inc. Blow molding processextrusion blow moldinginjection blow moldingstretch blow molding thermoforming process analysis of polymer extrusion example 1. Emsgrivory blow molding materials are supplied with moisture content below 0. Pdf measurement and calculation of parison dimensions. The processing section addresses safety concerns associated with the blow molding process, helps optimize blow molding machine and resin performance and.
Strict stock control should be implemented, including lot control and turnover of inventory to reduce the storage time of materials. Extrusion blow molding process pdf industrial processes. At apex, we use a process called continuous extrusion blow molding to turn raw plastic into highquality finished products for our customers. That is why every graham blow molding machine uses the xbm navigator, a proprietary pcbased system designed by us. Please explain the blow molding process it seems that everyday more and more bottles made by plastic blow molding show up in the marketplace. A typical blow molding process begins with a heated hollow thermoplastic tube, also known as preform or parison. Energy savings and the capability of a multilayer coextrusion. The cycle is repeated automatically or semiautomatically with a short cycle time for mass production of a stream of molded parts. Extrusion blow molding technology paulson training programs. Measurement and calculation of parison dimensions and bottle thickness distribution during blow molding article pdf available in polymer engineering and science 216. Multilayer blow molding nadfinlo plastics industry co. Do you have a need for more than 3,000 parts or have an annual spend. Compressed air is injected through the blow stem into.
This study considers some objectives including reducing the total cost, increasing the amount of. Injection blow moulding british plastics federation. Parison not being blown defective blow timer, clogged blow lines, or too sharp pinchoffs replace blow timer clean blow lines stone pinchoffs to create more pinch area reset cushion clean tooling 2. Extrusion blow moulding is one of the most popular blow moulding techniques that widely used in plastic industry and also known as industrial blow moulding. Simulation of the stretch blow molding process of pet bottles. Blow molding moulding is a specific manufacturing process by which hollow plastic parts are formed and can be joined together. Blow molding is a process for converting thermoplastics into hollow objects of desired shape and size. Paulsons comprehensive blow molding technology interactive training program teaches the blow molder how to exercise accurate control over the extrusion blow molding process. Thermoplastic blow molding of metals sciencedirect.
We offer multiplatform, blow molding expertise utilizing a broad material portfolio, including pet, pp, hdpe, pvc, ps, pcr and other specialty resins. Public awareness of environmental protection and life quality always leads to higher standard of products. The process is ideal for both narrow and widemouthed containers and produces them fully finished with no flash. This study is based on the modification and development of a twoliter plastic container blow molding machine into a fiveliter one provided with a translucent view stripe. It is the most versatile extrusion blow molding process and is able to process many types of resin. Broader molecular weight distribution resins exhibit greater shear sensitivity, providing certain processing advantages in the blowmolding process. Modification and development of a blow molding machine. Blow molders for blow molders the efficiency of a production line is closely linked to the accuracy and ease of use of its controls. Blow molding free download as powerpoint presentation. This parison is then captured by closing it into a cooled metal mold. Difference between extrusion blow molding and injection. Across the globe, blow molding machines are being called upon to manufacture. Simulations of various stretch blow and blow moldings of axisymmetric pet bottles has been.
The differences between injection molding and blow molding. A within a split mold cavity, air pressure is applied to a heated plastic material called a parison that expands similar to a balloon and is shaped against the walls of the mold cavity. Extrusion blow molding is a process that can create hollow parts. Whether using the injection stretch blow molding process or the reheat and blow process, an important part of the process is the mechanical stretching of the preform. As a result of the relatively high tooling costs, injection blow molding is typically used for large production runs. Blow molding is a molding process in which air pressure is used to inflate soft plastic into a mold cavity. Blow mouldingprocess, application and troubleshooting.
Extrusion blow molding guidebook blow molding advisors at apex. The injection blow moulding process produces bottles of superior visual and dimensional quality compared to extrusion blow moulding. In the past few years, other plastic processes, such as. S student faculty of science tanta university 1 introduction extrusion blow molding extrusion blow molding 2 extrusion extrusion is a process used to create objects of a fixed crosssectional profile. Injection blow moulding is used for the production of hollow objects in large quantities. Blow molding process apex plastics extrusion blow molding.
Train production personnel, supervisors and managers to understand the basics of extrusion blow molding technology, plastic behavior during the. Simulation and design of an oven for pet blow molding machines. Even with the huge environmental impact of millions of bottles in the environment, consumers have come to expect and demand the never ending stream of new products packaged in plastic bottles. Notes and animation describing the extrusion blow moulding process. The extrusion blow molding process in plastic bottle.
Extrusion blow molding an overview sciencedirect topics. Extrusion blow moulding by opening the mould, the finished product is ejected. Injection blow molding an overview sciencedirect topics. Injection blow molding ibm is similar to extrusion blow molding, except that the parison is formed by an injection molding process around a core rod or metal shank as shown in position 1 in the schematic in fig.
The preform along with the blow stem are then placed in the blow molding chamber. Extrusion blow molding is a process used to form hollow thermoplastic objects especially bottles and containers. There are two different industry segments that use extrusion blow molding, packaging bottles. Introduction blow molding is a manufacturing process widely used to create hollow thinwall plastic objects such as bottles, cases, containers, and bellows. In the ibm process, the polymer is injection molded onto a core pin. Train your production personnel, supervisors and managers to understand the basics of blow molding technology, plastic behavior, and common problem solving situations. Regency plastics supplements our engineers decades of experience in blow molding with state of the art blow molding simulation software that takes the guesswork out of the design process. The distances between the tooling and the cooling bath were 20, 40, and 60 mm. Blow molding, also known as blow forming, is a manufacturing process by which hollow plastic parts are formed. The melted thermoplastic material is injected into the injection mold and formed around the blow stem. Blow molding, until the last few years, was the main plastic process utilized to produce a hollow object. Influence of blow molding parameters on balloon properties. How extrusion blow molding differs from injection molding. Air is then blown into the parison, inflating it into the shape of the hollow bottle, container, or part.
As a replacement of glass, there is increasing demand in multilayer coextruded plastic hollow containers that are completely sealed, light resistive, corrosion resistive, heat resistive, antibacterial. Medraj mech 4216511 lecture 172 blow molding process accomplished in two steps. Accumulator head technology industrial blow molding machines. Extrusion blow molding free download as powerpoint presentation. We have been successful because of our strong customer relationships. Extrusion blow moulding process is a framing process of a bladdery product by blowing a thermoplastic liquid tube called a parison fit as a fiddle of. Longer distances were not possible, because the dimensional variations were too large to support a constant blow molding process, and consistent tubing dimensions could not be maintained. All three online courses use standard industry terms and practices with an emphasis on safety, and will enhance the knowledge base of all personnel involved in extrusion blow.
After the mass solidifies the mold halves are separated and the part is removed and the process is repeated. The effect of extrusion and blow molding parameters on. Troubleshooting guide for blow molding problem possible causes possible solutions 1. Simulation and design of an oven for pet blow molding.