Resin Pricing recent news - Plastics Today
WEBResin Pricing. Resin Pricing. Resin Price Report: Prices Drop Amid Relatively Mild Hurricane Season. PE commodity resins drop by as much as a penny, while PP resins are down one to two cents. by Staff. Sep 18, 2024.
Extrusion Basics: The Taming of the Screw - Injection Molding …
WEBSep 19, 2021 · It’s much faster than inside any extruder — in a 12-in./30-cm barrel, running fast at 100 rpm, a particle at the barrel wall still reaches only 314 ft/min, or 0.36 miles per hour. None of this is important in running an extruder, but to us engineers, it’s fun. It is important, however, to understand how a screw works.
About the Author - Injection Molding Magazine
WEBAug 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 ...
Snap-fit Design for Injection Molded Plastic Parts
WEBNov 15, 2019 · The equilateral and half-round profiles enable snapping on or off two parts simply by pressing them together or pulling them apart. We will examine the design considerations associated with each of these snap options based on the previous list of parameters. Deflect within the strength limits of the plastic.
Extrusion technology company demos scalable melt-blown PP …
WEBJul 24, 2020 · Extrusion: Film & Sheet. Materials. Medical. Tests conducted by Coperion and Lummus Novolen Technology show that a process for producing polypropylene (PP) pellets achieves reliability, regardless of throughput rates and melt viscosity. Melt-blown PP forms the raw material for nonwovens used as filter media in medical-grade face masks.
The Materials Analyst, Part 106: Determining filler content—TGA or ...
WEBMay 21, 2009 · The mass of the residue divided by the mass of the original sample provides a simple measurement of filler content. The second approach uses a method known as thermogravimetric analysis (TGA). The principle of this test is the same as the ash test, but there are some important differences. Figure 1.
Everything you ever wanted to know about extrusion
WEBJul 10, 2017 · A: Separate melt temperature probe in the head, well after screens and static mixer if possible; variable depth is best but easily damaged. Also, infrared measurement of emerging extrudate is good if gauge is held firm or fix-mounted. For round products, scan slowly across the product and watch for the highest value.
Weekly Resin Report: Supply Shortages and Soaring Prices
WEBMar 2, 2021 · The vast majority of high-density PE blow mold resin is produced in the Gulf, and available materials are increasingly challenging to source, reports the PlasticsExchange. Blow mold prices have risen the most among PE grades, gaining $0.26/lb in February and $0.42/lb since the beginning of the year.
CA SB 54 Plastic Packaging Law: Three Questions Answered
WEBAug 18, 2022 · Recycling does not include combustion, incineration, energy generation, fuel production (with limited exception), or other forms of disposal. The recycling rates for all plastic packaging and foodservice material must meet the specified rate of 65% by January 1, 2032. Interim targets are 30% by January 1, 2028, and 50% by January 1, 2028.
Tooling Corner: Die design for extrusion - Injection Molding …
WEBNov 5, 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).