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. Extrusion blow molding lesson 2 plastic behavior during. Others include injection blow molding, biaxial stretch blow molding, and coextrusion blow molding. The parison is a tubelike piece of plastic with a hole in one end through which compressed air can pass.
Extrusion blow molding is the largest process user of highdensity polyethylene hdpe, with products including bottles, large holding tanks, and automotive fuel. Blow molding is the manufacturing process by which hollow plastic parts like bottles and containers are formed. Pdf blow characteristics in extrusion blow molding for. As a result of the relatively high tooling costs, injection blow molding is typically used for large production runs. Extrusion blow molding is the largest process user of highdensity polyethylene hdpe. Extrusion blow molding an overview sciencedirect topics. Blow molding bre moulding is a manufacturing process by which hollow plastic parts are formed. Generally, machines set up to process polyvinyl chloride. With extrusion blow molding, a good mold can get you a long way toward where you want to be. Blow molding modified extrusion and injection molding processes extrusion blow molding small tube is first extruded, usually vertically, then clamped and air blown inside to expand it to fit a much larger diameter mold air pressures 350700 kpa 50100 psi can be a continuous process corrugated pipe and tubing.
Program 1 primer material handling extrusion blow molding product testing basic. Injection blow molding an overview sciencedirect topics. Blow molding explained manufacturing solutions group. Extrusion blow molding process regency plastics, gemini group.
In the blow molding process it is possible to combine co extrusion with biaxial orientation to produce strong, lightweight bottles which give a long storage life to the products. Extrusion blow molding process regency plastics, gemini. Computer integrated manufacturing cim in extrusion blow molding. In continuous extrusion blow molding the parison is extruded continuously and the individual parts are cut off by a suitable knife. Plastic bottle production what is extrusion blow molding ebm. Mar 25, 2016 in continuous extrusion blow molding the parison is extruded continuously and the individual parts are cut off by a suitable knife. Therefore, the present study sought to answer the following question. Mold in closed position stretcn blow molding pgoduces bia ial orient ati o n greatly figure 46 twostage reheat blow molding.
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 process is ideal for both narrow and widemouthed. It is also used for forming glass bottles or other hollow shapes. Blow molding modified extrusion and injection molding processes extrusion blow molding small tube is first extruded, usually vertically, then clamped and air blown inside to expand it to fit a much larger diameter mold air pressures 350700 kpa 50100 psi can. Uniloys core technologies include urs reciprocating series blow molding machines, industrial blow molding machines, uai accumulator head, and uci. The parison consists of a fully formed bottlejar neck with a thick tube of polymer attached, which will form the body of the bottle. Introduction blow molding is a manufacturing process widely used to create hollow thinwall plastic objects such as bottles, cases, containers, and bellows. Difference between extrusion blow moulding and injection blow. The polymer is injected into a closed mold with a blow pin and parison. The total blow molding industry is growing approximately 3e5% annually and will continue to grow at this rate. 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. The blow moulding machine is based on a standard extruder barrel and screw assembly to plasticise the polymer. A comprehensive experimental study and numerical modeling of. Extrusion is a continuous process used to manufacture plastic products such as tubing or profiles.
The blow molding process begins with melting down the plastic and. Injection blow molding blow molding blow molding process. Air is then blown into the parison, inflating it into the shape of the hollow bottle, container or part. Injection blow versus extrusion blow injection blow extrusion blow injection molded neck. Blow molding bre moulding is a specific manufacturing process by which hollow plastic parts are formed and can be joined together. What follows is an explanation of the extrusion blow molding process and how it differs from injection molding. All of which utilize elements of either extrusion or injection, or both. Blow molding pgoduces bia ial orient ati o n greatly figure 46 twostage reheat blow molding. The main applications are bottles, jars and other containers. Dave technical services extrusion blow moulding machines.
Guide to extrusion blow molding i contents list of contributors 6 contents i introduction 1 1. Extrusion process the extrusion process converts a solid plastic feedstock material into a molten viscous fluid, and then to a finished solid or flexible film product for practical use. Our solution covers the entire order process, tracking every operating step that is pertinent to blow molders. Apr 10, 2014 train production personnel, supervisors and managers to understand the basics of extrusion blow molding technology, plastic behavior during the blow molding process, machine setup for optimal. In the blowmolding process it is possible to combine coextrusion with biaxial orientation to produce strong, lightweight bottles which give a long storage life to the products. At apex, we use a process called continuous extrusion blow molding to turn raw plastic into highquality finished products for our customers. Extrusion blow molding ebm is used to produce hollow parts. Extrusion blow moulding by opening the mould, the finished product is ejected. Extrusion blow molding is one of several blow molding methods to produce plastic bottles, jars, and jugs. Blow molding uniloy parts, products, services, training. All of the processes share distinct production stages. Lomont molding provides fully customized blow molding services for your project needs. Notes and animation describing the extrusion blow moulding process.
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. Extrusion blow molding ebm is the oldest of the various blow molding processes. The following guide refers specially to the blow molding process. However, to a layman, the entire concept may sound difficult to comprehend. Pdf blow molding modified extrusion and injectionmolding process characteristics hollow thinwalled parts of various sizes high production. However, all the blow molding processes consist of five successive stages fig. Extrusion blow molding process pdf free download as pdf file. Blow molding modified extrusion and injectionmolding process characteristics hollow thinwalled parts of various sizes high production rates low cost for making beverage and food containers. Is it possible to have an immediate influence on balloon properties by varying the extrusion parameters while keeping the blow molding parameters constant. Blow molding machine manufacturers in mumbai showing blow moulding process.
Others include injection blow molding, biaxial stretch blow molding, and co extrusion blow molding. Injection blow moulding is used for the production of hollow objects in large quantities. Extrusion blow molding is a process used to form hollow thermoplastic objects especially bottles and containers. In extrusion blow molding ebm, plastic is melted and extruded into a hollow tube a parison.
Extrusion blow molding is a process that can create hollow parts. Spmbs1605 extrusion blow molding with eastman copolyesters. Blow molding process apex plastics extrusion blow molding. In general, there are three main types of 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. This is done using a continuous extruder, a reciprocating. In intermittent blow molding there are two processes. In the process, a molten tube, or parison, is extruded into a mold cavity and injected with. It is based on the capacity of thermoplastic materials to be mellowed by warmth and to be solidified when cooled. 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. In the stretch blow molding sbm process, the plastic. 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 a mould hole.
Cyframe software is not just limited to building the bill of materials for extrusion or stretched blow molding. 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. The mold closes around the parison and air is pumped in to inflate the parison against the mold walls. Injection blow moulding british plastics federation. Uniloy is a global leader in blow molding technologies and the only blow molding machine manufacturer to offer four unique blow molding technologies as well as blow molds and associated tooling. There are two different industry segments that use extrusion blow molding, packaging bottles. 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 production best practices extrusion blow molding. There are many variations of blow molding machines, including continuous extrusion, intermittent extrusion, accumulator head and injection blow molding machines. The injection blow moulding process produces bottles of superior visual and dimensional quality compared to extrusion blow moulding. Extrusion moulding for plastic bottles making we will offer you blow moulds price as we received your plastic blow product drawings or sample.
Polyolefins for blow molding polyolefins are the most widely used plastic for blow molding. The effect of extrusion and blow molding parameters on. Blow molding processextrusion blow moldinginjection blow moldingstretch blow molding thermoforming process analysis of polymer extrusion example 1. Extrusion blow moulding british plastics federation. Extrusion blow molding process pdf industrial processes. A typical blow molding process begins with a heated hollow thermoplastic tube, also known as preform or parison. 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. Injection blow molding is the process of inflating a hot, hollow, thermoplastic preform or parison inside a closed mold, so its shape conforms to that of the mold cavity. Layered coextrusion is not the only type of coextrusion. Computer integrated manufacturing cim in extrusion blow. Extrusion blow molding process pdf industrial processes plastic. Ppt extrusion powerpoint presentation free to download. 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.
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. Plastic news reported through september 2008 that united states production of hdpe was 12. To ease up this confusion, we will clearly spell out the differences between extrusion blow moulding and injection blow moulding. Layered co extrusion is not the only type of co extrusion. This parison is then captured by closing it into a cooled metal mold. Extrusion blow molding guidebook blow molding advisors at apex. How extrusion blow molding differs from injection molding. To get the rest of the way, the process the type of plastic, processing parameters, head tooling selection, to name several has to be carefully considered and controlled.1547 88 238 1493 1397 1281 1548 54 872 109 228 1513 908 1228 264 173 321 418 723 1183 1214 593 229 570 1034 1322 748 1367 475 1348 1004 1315 1324 1487 380 974 166 862 1154 461