CHICAGO — Fans of really high-output PVC extrusion, take note: American Maplan Corp. (Booths S1400, S1800) claims it has the world's largest extruder for rigid PVC at its McCormick Place stand.
The twin-screw extruder, dubbed BEX 168 2-168-24, has a screw diameter of 168 millimeters. The machine is part of American Maplan's TSP line. It is designed to extrude vinyl pipe and siding. Length-to-diameter ratio is 24:1.
A Canadian company is already using one of the big machines to extrude PVC pipe 48-inches in diameter.
The BEX 168 machine can pump out PVC at 4,400 pounds an hour.
Maplan's previous largest machine could hit 2,800 pounds. Even with the high output and big diameter, the 168's overall length is relatively short because the machine has a starve feeder that preheats the material.
Maplan also is showing its first single-screw extruder for high density polyethylene pipe — a product developed since Maplan was acquired in mid-1995 by Battenfeld GmbH of Germany. Maplan was not active in PE pipe before the acquisition, instead focusing on PVC.
The SS 90 30-B extruder has a screw diameter of 90mm. It can turn out between 1,210 and 1,320 pounds of PE pipe an hour.
The PE pipe extruder is available from 60-150mm, with a maximum output of 2,800 pounds an hour. L/D ratio is 30:1. Standard features include a nitrided barrier screw.
Battenfeld's acquisition also means Maplan has expanded its downstream equipment. At NPE, Maplan is displaying a new line of vacuum calibration systems for pipe. They can accommodate pipe diameters of one-half inch to 56 inches.
Maplan builds the Battenfeld-design Amvac calibrators at its headquarters plant in McPherson, Kan.
Also new from Maplan — an RD double-spider-design extrusion head for PVC pipe, up to 39 inches in diameter.
The patented RD design uses a center ring between the major dimension and minor dimension of the spider section.
That gives two sets of spider legs that are offset from each other, eliminating straight knit lines on the pipe.