Cutting molded acetal copolymer tubing, using a Firestar 100W laser, produced a clean cut edge.
Acetal copolymer, also called polyacetal or polyoxymethylene (POM) is an engineered thermoplastic polymer that features high wear resistance, high flexure fatigue strength, and excellent dimensional stability. Acetal copolymer is available in a pure, unfilled form or can be modified by special additives including glass fibers, colorants, or lubricants. Acetal products are easily created by injection, compression, or blow molding, by extrusion, or by rotational casting. Acetal copolymers are also available in medical and food grades for manufactured products sold to the medical or food processing industries.
This application called for cutting molded acetal copolymer tubing with a wall thickness of 0.041” (1.0 mm). Our beam delivery consisted of a Firestar 100 watt laser focused through a 2.5” positive meniscus lens, providing a 0.004” spot with a 0.07” depth of focus. Clean, dry air at 20 PSI was delivered through the nozzle (coaxially with the beam) for the gas assist.
Part motion was achieved using a rotary stage so that the tubing was rotated under the point of focus at a linear cut speed of 122 inches per minute (IPM). Although acetal vaporizes completely, leaving a cleanly cut edge, properly placed fume extraction prevents any vapor from being re-deposited on or near the cut edge.
DuPont Engineering Polymers Packaging & Industrial Polymers launched its Delrin line of acetal resins at the Luxe Pack exhibition in New York. The resins apply technologies DuPont de-veloped for more established resin markets, such as automotives and flooring, and are expected to enable manufacturers of fragrances and cosmetics to lower their costs while packaging their products more aesthetically.Although DuPont does not yet have projections for the size of the market for Delrin or its rate of growth, the company has already signed licensing agreements with original equipment manufacturers.
While introducing the product line, Stefan Greulich, global market development manager, noted that Delrin offers high resistance to alcohols and most other ingredients in perfumes and cosmetics.
DuPont is introducing three resins for painting-Delrin DS100, DS500 and DS900-as well as two resins for plating, Delrin DS500M and DS900M, which will become available in July. Except for Delrin Etch solution, no special chemicals are required for plating Delrin. Parts can be decorated using the same equipment and baths for plating ABS plastics.
Source:ICIS Chemical Business
Dymetrol® Company, Inc.
P.O. Box 250
1305 W. Seaboard Street
Bladenboro, NC 28320
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Dymetrol® produces its acetal cable Zip Tie ties from a superior grade of acetal called Delrin®. Delrin® is a registered trademark of the DuPont Company. Dymetec® is a registered trademark of Dymetrol® Company, Inc.
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