Technology Updates




The Versatile Mold Exchange (VME) is claimed to be the first quick mold change mechanism that allows removal of an individual mold without disassembling the whole spider. The VME allows one person to change molds in about three minutes. For information contact Norstar Aluminum Molds, Cedarburg, WI, USA. Ph: (414)375-5600, Fax: (414)375-5660.


A new patching kit allows molders to salvage polyethylene parts with blow holes, voids, and bubbles. The water based liquid polyethylene based compound can be colored to match a molded part. For information contact Mold-In Graphic Systems, Clarkdale, AZ, USA. Ph: (520)634-8838, Fax: (520)634-9036.


Multi-layered, multi-color, and foamed parts can now be molded without a drop box. The material for the inner layer is placed in a polyethylene bag that is put into the mold along with the material for the outer layer. A third layer can be provided by placing a second bag inside the first bag. For additional information on the Foama-Bag System contact Chroma Corp., McHenry, IL, USA. Ph: (815)385-8100, Fax: (815)385-1518


Plastic material can now be automatically charged into a mold to an accuracy of ±3% by simply scanning a bar code on the mold. For additional information contact EAP Machinery Systems, Erie, PA, USA. Ph: (814)455-6117, Fax: (814)455-5818.

UV Stabilizer

Cytec announced their hindered amine stabilizers (HAS) to protect polyolefins.  HALS are Essential components in formulations developed for outdoor use and have been proven to be effective thermooxidative stabilizers.  The physiochemical properties of hindered amines have a profound effect on the hindered amine’s performance as a stabilizer, and will also influence the reactivity of the HAS with other formulation components, environmental agents, etc.  Some of these interactions can have a deleterious effect on end product aesthetics and service life.  Studies on the relationship between HALS structure and performance have led to the development of new products which provide optimal light stabilizing efficiency while minimizing the tendency to undergo undesirable side reactions with system components or external agents. These new products have been used in PP fiber, PE film and other applications.  For the details, please see the paper presented on February 23, 1999 at International Conference on Polyolefins XI in Houston, Texas.  The SPE presentation is titled “What’s Structure Got to Do with It: New Breakthroughs in Hindered Amine Stabilizer Performance”.  The paper covers the role of hindered amine stabilizers (HAS) in the protection of polyolefins and its continued role expansion.  For more information, please contact: Cytec Industries Inc., Five Garret Mountain Plaza, West Paterson, NJ 07424-3360, Ph: (888) 298-3272, Technical Service: (800) 486-5525.

Rotational Molding Works Better in a Vacuum

During the rotational molding process, vacuum hastens part densification during processing, leaving fewer air voids in the part and thereby enhancing mechanical properties. Vacuum also provides a wider processing window. Limited tests to date yielded 17% shorter cycle times and a 58% boost in low-temperature impact strength.

          – “Plastics Technology”, June & July, 1998, p. 23, p. 56-57, by Kent Evans, Equistar Chemicals

Evacuating a rotational mold before you make a part may sound like a strange idea, but it’s also a simple way to achieve faster cure times and improved part properties. For this reason, rotomolders should give serious consideration to switching form the standard “vented” process in favor of the vacuum process.

New Free Service for Rotational Molding Professionals

PLASTICS TECHNOLOGY Magazine has launched a free daily online news service that’s linked to five years of archived articles. The news service provides stories on a wide range of the topics, including technology, business and the economy, mergers and acquisitions, resin pricing and more. PLASTICS TECHNOLOGY Today will also feature occasional company profiles of leading North American processors.

PLASTICS TECHNOLOGY Today will also be linked to an archive of articles that have run over the past five years in PLASTICS TECHNOLOGY Magazine. Users will be able to access these articles by a key word search. Key words could identify a specific process on equipment type, company name, trademark, individual’s name, etc.

Access to PLASTICS TECHNOLOGY Today and the archives is through

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