PlasticsToday
PlasticsToday covers developments in injection molding, extrusion, thermoforming, blow molding, and other forms of plastics processing.
About the Author - Injection Molding Magazine
Aug 13, 2016 · Three-zone principle. The screw starts with a feed zone: Constant depth, takes up 15 to 30% of length. In the middle is the compression zone, walls close in on the melt/pellet mix, drive air backward and make up for slipping and rolling of pellets in the feed zone. This zone contains the “barrier” of barrier screws: A long double-channel ...
Resin Pricing recent news - Plastics Today
Oct 31, 2024 · Resin Pricing. Resin Pricing. Resin Price Report: Steep Declines Ahead for PP Contracts. PP contracts could drop an additional $0.06/lb in October, bringing the two-month decrease to $0.10/lb. by Staff.
My customer wants me to submit to IMDS; what do I do now?
Mar 14, 2014 · There are two problems with this strategy: 1. Your suppliers are often smaller companies than yours, meaning they have even less flexibility to fulfill the IMDS requirement than you do. 2. Even if your suppliers completed their IMDS requirement, you still need to create a record for your product.
Medical Plastics 101: Cyclic Olefin Copolymer
Feb 2, 2021 · Cyclic olefin copolymer (COC) is a unique member of the polyolefin family, which also includes high-volume materials like polyethylene (PE) and polypropylene (PP). It was introduced a few decades ago and has become a widely used material in medical and packaging applications. The extremely high purity and unique properties of COC have made it ...
Words of Wisdom: Understanding twin-screw extruders: The high …
Mar 4, 2006 · For example: A 40-mm twin-screw extruder is processing a mineral-filled PP at 160 kg/hr, running at 400 rpm with a %torque of 68%. The machine has a 56 kW (approx. 75 hp) motor and a maximum possible screw rpm of 600. kW (applied)=56 kW x .68 x 400/600 x .97=.154 kW per kg/hr. A lower SE indicates that less mechanical energy is being used, and a larger SE indicates more energy.
PolyOne Completes Clariant Buy, Changes Name to Avient
Jul 1, 2020 · Materials supplier PolyOne Corp. announced today that it has completed its purchase of the color masterbatch businesses of Clariant and Clariant Chemicals India Ltd. for $1.44 billion. PolyOne also announced that it has changed its name to Avient. "We proudly welcome our newest associates and valued customers from Clariant Masterbatch.
How to Build a Better Monobloc Plastic Chair - Injection Molding …
Aug 7, 2020 · The chair is injection molded in a single piece using 100% recycled polypropylene. The parameters set by Magis were strict, said Grcic, in terms of materials and the ultimate price point. To meet the cost requirements, “we had to get the cycle time under a minute, because that is what costs money, more than the material itself,” said Grcic.
Tooling Corner: Die design for extrusion - Injection Molding …
Nov 4, 2002 · Some basic guidelines in profile design minimize extrusion problems: Use generous internal and external radiuses on all corners; the smallest possible radius is about .5 mm. Maintain uniform wall thickness (important!). Make walls no thicker than 4 mm. Make interior walls thinner than exterior walls (for cooling).
The Materials Analyst, Part 23:Stress cracking: How to avoid this ...
Aug 14, 1999 · Once the stress is relieved by the initiation of the crack, the material does not undergo any further chemical attack. Two solutions were posed to this problem. The first option was to change to a filled polypropylene. Polypropylene is semicrystalline and therefore has much better chemical resistance than polystyrene.