Core Tube Extruder

This device is used to extrude sediment from cores with a resolution of 1 mm.  One turn of the threaded metric rod is equal to a distance of one millimeter.  Thus sampling intervals can be precisely determined by counting the number of turns.  A single-edge razor blade is used to remove the extruded sediment.

Parts List

    Core Tube - 0.5" (12.8 mm) diameter butyrate tubing

    Stopper - plastic rod to fit inside core tube

    Screw Rod - Threaded metric rod (10 turns/cm, 5.72 mm dia.) (stainless steel)

    Handle - Wooden dowel

    Core Tube Holder -     1" PVC pipe plug

                            End cap for butyrate tubing

                            Nut for screw rod (stainless steel)

The Core Tube Holder is constructed as follows:

    Fill the nut with hot wax to keep glue from fouling the threads

    Glue the nut in the center of the pvc plug using 2-part epoxy

    Glue the butyrate end cap in the pvc plug

     Allow the glue to harden

    Drill a 1/4" (6.35 mm) hole in the center of the pvc plug

    Thread the screw rod into the nut to clear the wax from the nut threads

The butyrate tubing and end caps can be purchased from:

    United States Plastic Corp. (www.usplastic.com)

        Tenite Butyrate Tubing - Stock No. 42121

        Polyethylene Cap - Stock No. 42101

Created by J Pinckney ------- Last Update: 25 Aug 2006