Plastic bottle production what is extrusion blow molding. Extrusion blow molding is a process used to form hollow thermoplastic objects especially bottles and containers. Extrusion blow molding lesson 2 plastic behavior during. Continental can was issued a patent for a continuous extrusion blow molder in 1950. Extrusion blow molding process pdf industrial processes. A comprehensive experimental study and numerical modeling of. Pdf heat transfer and microstructure in extrusion blow molding. This lesson is titled the process and the equipment. Generally, injection blow molding is used for small bottles and parts less than. Extrusion blow molding, the most common process, is used for bottles or parts 250 ml in volume or larger. All about necks apex plastics extrusion blow molding.
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. Blow molding overview davis standard extrusion systems. Guide to extrusion blow molding i contents list of contributors 6 contents i introduction 1 1. This technology results in multidimensional tpv parts that meet higher performance levels at a lower produced cost. Very exacting requirements are imposed on the material when processing polyamide by extrusion blow molding.
The process is ideal for both narrow and widemouthed containers and produces them fully. A continuously extruded or batchwise produced tube generally known. After the plastic has cooled sufficiently, the mold is opened and the part is ejected. Tuesday, february 25th 2020 learn about the extrusion blow molding process, and how apex can help you with your next project. Blow molding pgoduces bia ial orient ati o n greatly figure 46 twostage reheat blow molding. Blow molding bre moulding is a manufacturing process by which hollow plastic parts are formed. In intermittent blow molding there are two processes. Flambeau now has over 100 blow molding machines ranging in size from 1 to 40 pound shot in its facilities around the world. Wall thickness of the lower part of blow molded sample was thicker than that of the upper part because of the sagging of parison during extrusion process. 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 molding an overview sciencedirect topics. For the next few weeks, we are starting a series of blogs called from the heartland.
Software products can help predict molding characteristics and our engineers. Ppt extrusion powerpoint presentation free to download. How extrusion blow molding differs from injection molding. Blow molding processextrusion blow moldinginjection blow moldingstretch blow molding thermoforming process analysis of polymer extrusion example 1. Mar 25, 2016 in continuous extrusion blow molding the parison is extruded continuously and the individual parts are cut off by a suitable knife. The process is not unlike that used for producing glass bottles, in that the. In continuous extrusion, an open mold moves to the parison, closes on the parison, cuts a section off, and then reverses its path, allowing the extruder to continue. All of the processes share distinct production stages.
Guide to extrusion blow blow molding advisors at apex. This guide focuses on the extrusion blow molding process. The technology of converting plastic materials by the blow molding process is. Medraj mech 4216511 lecture 172 blow molding process accomplished in two steps. Request a quote apex plastics extrusion blow molding. Injection blow molding an overview sciencedirect topics. Heat transfer and microstructure in extrusion blow molding article pdf available in polymer engineering and science 239. You can view more paulson training videos at our plastics training center.
Revenue, usd million, 2014 2025 injection blow molding. The first step in the extrusion blow molding manufacturing process is the extrusion of a tube, also called a parison, of viscous plastic into a product mold. It is a common blow molding technology used to process many different plastics, including hdpe, pvc, pc, pp, and petg and very common with bottles requiring multilayer technologies bottles with special oxygen moisture barrier requirements to improve product. Plastic bottle production what is extrusion blow molding ebm. Blong specialty fluoropolymers department 3m company st.
Extrusion blow molding process regency plastics, gemini group. Since entering this market in 2003, graham engineering has dramatically improved traditional recip machine designs and performance, then subsequently. Others include injection blow molding, biaxial stretch blow molding, and coextrusion blow molding. The parison consists of a fully formed bottlejar neck with a thick tube of polymer attached, which will form the body of the. Parison sag this causes a decrease in thickness of parison as it is being extruded. All of which utilize elements of either extrusion or injection, or both. Extrusion blow molding ebm is used to produce hollow parts. Stock temperatures typically run in the 380 to 430f. The parison consists of a fully formed bottlejar neck with a thick tube of polymer attached, which will form the body of the bottle. In 1961, flambeau added blow molding to their capabilities. Polyolefins for blow molding polyolefins are the most widely used plastic for blow molding.
Extrusion blow molding 1 extrusion of parison 2 parison is pinched at the top and sealed at the bottom around a metal blow pin as the two halves of the mold come together 3 the tube is inflated so that it takes the shape of the mold cavity 4 mold is. Extrusion blow molding moulding delta engineering belgium. Air is then blown into the parison, inflating it into the shape of the hollow bottle, container or part. 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. For additional troubleshooting information, contact your dow. The custompak blow molding design guide provides you with basic design tools for making engineered blow molded parts.
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. Blow molding design guideline blow molding design guideline 3 radii corners material will freeze when it comes into contact with the mold, causing it to stretch into corners if parison is trapped pinched off at parting line, it must stretch into the cavity preblowing the parison prior to mold closure helps minimize stretch. The measurements were made at a weight of 21,6 kg and at a temperature close to the typical processing. Pdf blow characteristics in extrusion blow molding for. A simple explanation of the principle of blow molding is a balloon. This parison is then captured by closing it into a cooled metal mold. In general, there are three main types of blow molding. Extrusion blow molding is the largest process user of highdensity polyethylene hdpe, with products including bottles, large holding tanks, and automotive fuel. Pdf heat transfer and microstructure in extrusion blow. The mold closes around the parison and air is pumped in to inflate the parison against the mold walls.
In extrusion molding, plastics is continuously extruded and the individual parts are cut off by knife. The first stage comprises the production by extrusion of a preform which can be blow moulded, the second, blow moulding and cooling in the mould. The blow moulding machine is based on a standard extruder barrel and screw. Extrusion blow molding process regency plastics, gemini. This series is an opportunity for us to shine a light on the resources and assurances we offer our clients when they choose us for their current and future projects. The mold is removed and excess pieces are removed as well. Guide to extrusion blow blow molding advisors at apex container tech inc. Pdf blow molding modified extrusion and injectionmolding process characteristics hollow thinwalled parts of various sizes high production. The mold closes around the parison and air is pumped in to. Injection blow versus extrusion blow injection blow extrusion blow injection molded neck. Ottmar brandau started as service engineer with bekum in 1978 and has since then worked on a large number of machines of various types and manufacturers besides being involved in product design, plant layout and sales. It is not, however, intended to provide a complete listing of all blow molding challenges and problems. In the process, a molten tube, or parison, is extruded into a mold cavity and injected with. The polymer is injected into a closed mold with a blow pin and parison.
Extrusion blow moulding can be divided technologically into a twostage process which begins with plastication. Extrusion blow molding free download as powerpoint presentation. What follows is an explanation of the extrusion blow molding process and how it differs from injection molding. Extrusion blow molding is one of several blow molding methods to produce plastic bottles, jars, and jugs. In extrusion blow moulding ebm, plastic is melted and extruded into a hollow tube a parison. 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 molding operations. These higher tolerances are achieved with a significant reduction of scrap. Blow molding troubleshooting guide introduction this guide indicates possible causes and corrective actions for problems typically encountered in the blow molding process. The blow molding process begins with melting down the plastic and. This is a new book written to give engineers, operators, sales people, and managers practical and useful information in their daily business. High density polyethylene extrusion blow moulding applications by denis duchesne 3m canada inc. Blow molding explained manufacturing solutions group. Melt index mfi values have been measured on zytel blow moulding resins and are shown in table 1. In extrusion blow molding ebm, plastic is melted and extruded into a hollow tube a parison.
Shot pot spm series and reciprocating screw rsm series. Extrusion blow molding guidebook blow molding advisors at apex. I found the information extremely helpful allowing me to begin connecting the dots if you will of. Extrusion blow molding polypropylene gener purpose blow molding polyethylenes. Vents neck ring pinchoff mold body bottom insert pinchoff tail grabber slots for automatic trimmer a blow molding mold for a container with a handle. Each chapter is complete in its description of the material and has all the figures that are in the book. In straight intermittent extrusion, extruder screw run,stops and pushes melt out. 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. 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. The main applications are bottles, jars and other containers. Phd has the actuators of choice to keep your blow molding lines running while increasing productivity and reducing downtime and scrap. Difference between extrusion blow molding and injection.
Extrusion blow molding lesson 1 the process and the. The shape of the parison, especially its diameter and thickness pro. Injection blow versus extrusion blow injection blow extrusion blow. Injection blow moulding is used for the production of hollow objects in large quantities. And although you may find information on this topic in general books on blow practical guide to injection blow molding download practical guide to injection blow. For the purpose of this study, grand view research has segmented the global blow molded plastics market report on the basis of technology, product, application and region. Air is then blown into the parison, inflating it into the shape of the hollow bottle, container, or part. The injection blow moulding process produces bottles of superior visual and dimensional quality compared to extrusion blow moulding. Program 1 primer material handling extrusion blow molding product testing basic. Blow molding overview general uses retrofits and rebuilds automotive extends machine life packaging oem stateoftheart controls upgrades toys ansi safety compliance recreational spiral core tube retrofits medical head reconditioning housewares clamp rebuilds appliances replacement screws and barrels p. Troubleshooting guide for blow molding problem possible causes possible solutions 1. No two designs are alike, so the mold and process must be adjusted to optimize each design. Injection blow moulding british plastics federation.