Igloo touts success with Twinshot project
Igloo touts success with Twinshot project
The Troubleshooter, Part 110: Are you getting the picture?
Part/material: Black PC or PC/ABS.
Tool: Single-cavity cold runner.
Symptoms/problem: Blush near the gates and sink opposite the ribs.
Solution: Modify gate dimensions; change the runner to a full-round design and increase its diameter to 0.225 inch; enlarge the sprue O-diameter; change the nozzle to a full-taper with an orifice of 0.250 inch.
Mold cooling technology: Rexam acquires Ritemp license
a designer and manufacturer of multicavity injection molds for the consumer packaging, beverage, personal care, healthcare, and food markets, has integrated Ritemp mold cooling technology into some of its engineering processes. Rexam recently partnered with SWM & Assoc. (exclusive representative in the Americas for Ritemp) to identify processing gains and then moved to acquire a development license. SWM Chicago, headed by Terry Schwenk, works directly with tool shops and molders to optimize the entire molding process by reducing production time and operational costs through select technologies like Ritemp.
LONG FIBER COMPOUNDS MOLDING GUIDELINES: Drying Long Fiber Compounds
Moisture may be present in some materials, either on the surface or absorbed by the resin system. Without proper drying, this moisture may be converted to steam in the injection cylinder and cause blisters, splay, internal voids, and lamination of the molded part’s surface. Undried hygroscopic materials can suffer degradation of properties.
LONG FIBER COMPOUNDS MOLDING GUIDELINES: Minimizing Wear in Processing Equipment
Highly-filled engineering plastics can cause wear on conventional steel molds constructed with insufficient hardness. Of the factors causing wear, fiberglass content has the most influence with a Mohs hardness of 5 to 7. Comparatively, carbon fiber has a Mohs hardness of 2, and common tool steels have a hardness of 4.
LONG FIBER COMPOUNDS MOLDING GUIDELINES: Tooling Considerations
LONG FIBER COMPOUNDS MOLDING GUIDELINES: Tooling Considerations,Processing Considerations,Molding Temperatures
Softer Materials Like Polyethylene Terephthalate Can be Harder to Mold
Long considered a secondary material option for injection molded containers, polypropylene (PP) is coming back into favor with designers and engineers. Its rise stems largely from the everchanging packaging market. Today’s developments result from the drive toward smaller, stronger containers, an increased focus on sustainability, and the need for better performance on hot-fill lines. Now, the same attributes that made PP an option 10 years ago are the ones that all rigid packages need.
LONG FIBER COMPOUNDS MOLDING GUIDELINES: Equipment Considerations
A general purpose screw that utilizes a typical three-zone style is best for processing Long Fiber Compounds. The screw has three sections: feed, compression, and metering. Metering should be done with an L/D ratio of 16:1 to 22:1, with a low compression ratio of 2:1 to 2.5:1.
Long Fiber Compounds Molding Guidelines
When processed properly, Long Fiber Compounds retain their fiber length during molding. Correct processing is critical to maintaining high-quality parts; breaking the fibers during processing can result in sharply reduced material properties.
Overmolding Design Considerations
The required adhesion is dependent on the end-use application and environment. Not all overmold grades bond to all substrates. The substrate type determines which RTP Company TPE overmolding grade must be used to achieve the best bond. The end-use environment also influences which grade to select. The expected service life of the product should be considered when establishing adhesion requirements. Initial material selection is the first step.