Plastics Technology

JUL 2018

Plastics Technology - Dedicated to improving Plastics Processing.

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• From 51 sec to 10 sec; • From 39 sec to 8 sec. Apart from the time savings, there are other benefits: "We use all hot-runner molds," Watson notes. "Too long a mold-open time leads to nozzle drool. If we lower the nozzle temperature to prevent drool, we get other problems, like non- fills or freeze-off." The new robot grabs the metal sharp- ener inserts magneti- cally, then deposits them in a docking station and then re-grabs them with more critical alignment. The robot uses sensors to ensure that it has grabbed each insert, and only one insert at a time, rather than two that may have stuck together. The robot's electric eye also checks for precise insert positioning in the mold and halts the machine if it detects an error. "We have a tolerance of only 0.0005 in. on a side for posi- tioning the insert," Parkhurst says. DMT's molds have one, two, four, or eight cavities. The robot places the finished parts on a conveyor or in totes. It keeps count of the number of parts per box. If desired, the robot can be switched to "QC mode," whereby it places parts in a QC bin for checking. Watson likes another aspect of the robot programming, using Wittmann's R8.3 Teachbox: "We can block out certain areas— tiebars, mold, conveyors, guards—where the robot is not allowed to enter. In the past, if we made a mistake in programming a robot, we could get a crash, which was very unpleasant." Bettke says DMT is thinking about replacing its first injection machine, the 1985 Nissei, with a Wittmann Battenfeld vertical press, which will have its own Wittmann 4.0 integrated cell. According to Watson, the 4.0 system is "fairly intuitive" and easy to use, once you understand the basic principle. G-Series ® Configurable J-Stack roll stands yield superior sheet performance LIW feeders provide quick formulation set-ups and changeovers TITAN ® Plus control automation for ease of system coordination and control 100% flake feeding capability minimizes regrind inventory build-up Resins: PET, PLA, PP, PS, HDPE... Model: HVTSE ® 105mm-52D Rate: 3,500 lb/hr (1,590 kg/hr) Width: 40 in (1m) Gauge: 15 - 40 mils (0.38 - 1.00 mm) Process: Inline thermoforming Twin Screw by Bandera LEADING SHEET EXTRUSION TECHNOLOGY G-SERIES ® QUAD PLUS ™ CO-EX SHEET SYSTEMS Processing Technologies International, LLC | 2655 White Oak Circle Aurora, IL 60502 | Tel: 630.585.5800 | Fax: 630.585.5855 More capable robot EOAT has slashed mold- open times by around 80% in several cases. Wittmann W-833 robot with multi-headed EOAT saves time by placing metal inserts (r.) and removing finished parts (l.) in the same in/out cycle. Sensors in the EOAT confirm precise placement of the inserts. @plastechmag 43 Plastics Technology On-Site DMT/Acme United

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