polymer processing

Mandrel and die dimensions are estimated based on container dimensional data, container symmetry, blow-up ratio, targeted container weight, neck finish requirements and the type of material (degree of parison swell) that will be used to produce the container. An initial blow-up ratio must be calculated using the container design dimensions and the required parison diameter. The required parison diameter will depend on the relative size of the container, the container design (handle or no handle) and the container neck finish requirements. Initial blow-up ratios may be calculated using the following equation. Blow up ratio = Bd / Nd where: Bd = Bottle diameter, in Nd = Minimum neck diameter, in The blow-up ratio is compared with the maximum recommended blow-up ratio of the selected material. Blow up ratios of 2 or 3 to 1 are considered normal when molding commodity resins such as polyethylene. A blow-up ratio as high as 4:1 is a practical upper limit. The blow up ratio for large contai

A fault with the dryer will lead to hydrolysis of the material in the barrel of the machine. This will cause lowered I.V. of the material. Lowered I.V. is the major cause of bad quality in preforms and bottles. More than 60% of all PET processing related faults can be traced back to the dryer . Maintaining the dryer in optimum condition will allow the molding machine to perform at maximum efficiency and quality. Check the basics! Airflow - The most important parameter, there should be nothing causing a restriction in the process and regeneration air flow. Temperature - Process Temperature should be in the region of 145~170 º C Depending on the resin supplier and the drying time. Also check the Regeneration Temperature which should be around 200~230 º C depending on the maker. Time - Calculate (or measure) the time the material is in the hopper, this should be at least 3½ hours. Dewpoint - Correct dewpoint may vary according to the manufacturer of the dryer, consult the maker's

What Is It? A simple calculation that tells you the consumption of poly(ethylene terephthalate), PET by an injection molding machine. The Calculation Is... kg / hr = W x C x S Where; W = Weight of the container in kg. (e.g. 45 grams = 0.045 kg) C = Number of injection cavities S = Number of injection cycles per hour (shots) (3,600 / Cycle Time (sec) for one set of preforms) Example A machine with a cycle time of 14 seconds making a 35 gram bottle W = 0.035 C = 8 S = (3,600 / 14) = 257.1 kg / hr = 0.035 x 8 x 257.1 = 72 kg / hr

The first step in validating an injection mold according to injection mold validation flow chart is mold certification . Purpose: The purpose of the mold certification is to ensure the mold is built according to specification before the mold validation procedures begin, e.g., critical dimensions on the first mold set are cut "Steel Safe" , core/cavity stack up dimensions are correct, cavity to cavity spacing is correct, cooling circuit layout, etc. The tool builder is required to provide verification of all critical metal tolerances on core and cavity ‘fits’ to be +/- 0,005 mm. The critical part dimension metal tolerances must be less than 10% of the plastics part dimension tolerances. In many cases, it will be necessary to go tighter than 10%. The mold certification should be performed at the tool builder while the mold is being fabricated to expedite any needed adjustments to the mold. Mold certification needs to be agreed upon when the mold order is placed. A copy of t

Free magazines, eBooks, publications, newsletter review from the polymer processing industry. Celebrating over 50 years of service to the composites industry worldwide. For over 50 years Reinforced Plastics has been the first choice of moulders, fabricators and end-users as a comprehensive source of impartial and informed comment on the global composites industry. Their unique partnership with all the main industry players enables them to empower their readers with up-to-the-minute news on all aspects of the industry. They are totally committed to being the best in the business and maintaining the support of their readers and advertisers in the continuing challenges of their industry. Geographic Eligibility : Select International Offered Free by : Elsevier Limited Request Free!

Free magazines, eBooks, publications, newsletter review from the polymer processing industry. Modern Plastics Worldwide is the only plastics publication dedicated to covering global business management issues, key technologies, and the latest manufacturing management trends for the international plastics industry. Topics range across all processes, including injection, extrusion, blowmolding, thermoforming, blown film, cast film, and compounding. Modern Plastics Worldwide also covers the latest technology developments in materials, design, equipment, processing, and applications from a business strategy perspective, marketing information on new markets, industry trends, economic influences, forecasts and more. Geographic Eligibility : USA, Canada, Mexico, Selected International (Print or Digital version) Request Free! Canon Plastics Group - the Voice of an Industry Canon Communications LLC is a strategic partner to the plastics industry. Both of our publications, Injection Molding Ma

Free magazines, eBooks, publications, newsletter review from the polymer processing industry. IMM is the only publication devoted exclusively to the injection molding marketplace, consisting of custom and captive molders, contract manufacturers, OEM companies, part designers, moldmakers, and key members of the supply channel. Readers prefer IMM's editorial content as it provides them with "how-to" advice that contributes to their success. Geographic Eligibility : USA, Canada, Mexico (Print Edition Only), Selected International (Digital Edition Only) Request Free! Canon Plastics Group - the Voice of an Industry Canon Communications LLC is a strategic partner to the plastics industry. Both of our publications, Injection Molding Magazine and Modern Plastics Worldwide , address the plastics industry from a unique viewpoint. Each one offers in-depth coverage of its subject matter that a generalist publication just can’t accomplish. Each viewpoint helps readers stay on top of

To validate an injection mold, there are numerous items one must take into consideration before the mold is completed and work is ready to begin. First, it is advisable to hold a mold design review meeting with all involved parties prior to tool manufacture. Invite the mold builder, hot runner supplier, steel supplier, press supplier, resin supplier, and a strategic molder for the design review. Involving everyone early on in the process and keeping them informed throughout the building of the mold avoids needless complications. Once all the suppliers have been identified it is vital that they are all given training on the injection mold validation procedure , IMVP. The training should be done well in advance of the first mold qualification, if you have a pilot tool stage this is an ideal time. It could be done whilst the production tools are being manufactured. It is strongly advised the tool builder is made aware of the requirements of mold certification (steel measurements) before

The following steps are required in validating a injection mold according to injection mold validation flow chart. 1. Mold certification 2. Dry cycle mold 3. Process stability test 4. Gage repeatability & reproducibility (R&R) test 5. Mold viscosity test 6. Balance of fill analysis 7. Gate freeze test 8. Commissioning (multi-cavity analysis) 9. Design of experiments 10. Qualification (process capability study) 11. Mold metal Adjustments - centering process 12. Verification (30-day run)

Companies from the world’s plastics and rubber industry put their faith in K 2010 in Düsseldorf. Some 3,000 exhibitors will step out at the No. 1 event for the industry from 27 October to 3 November 2010. No other trade fair in the industry compares with K 2010 for the panorama it will provide on offerings from all over the globe. The extensive palette on display is once again assured by exhibitors’ international reach. Companies from every continent have signed up to showcase their innovations in the following categories: - Raw materials, auxiliaries, - Semi-finished products, technical parts and reinforced plastics, - Machinery and equipment for the plastics and rubber industry. Once again, suppliers from Germany, Italy, Austria, Switzerland and the USA as well as Asian manufacturers from China, Taiwan and India will be out in force. Among them will be not only the global market leaders but also a wealth of exciting newcomers.