Plastic and nonmetallic article shaping or treating: processes – Direct application of electrical or wave energy to work – Measuring – testing – or inspecting
Patent
1995-12-12
1997-05-20
Thurlow, Jeffery R.
Plastic and nonmetallic article shaping or treating: processes
Direct application of electrical or wave energy to work
Measuring, testing, or inspecting
264412, 264444, 264 401, 264 405, 264562, 264568, 425141, 4251742, 425388, B29C 4792
Patent
active
056309821
ABSTRACT:
A method and apparatus for extruding thermoplastic tubing of reduced eccentricity, in which tubing is extruded into a vacuum calibration box containing a cooling fluid and a sizing collar. An ultrasonic device for measuring wall thicknesses around the periphery of the tubing is located downstream of the sizing collar. The wall measurements are used to determine a critical parameter, and if this critical parameter is outside of a predetermined range, the vacuum calibration box is moved in the direction of greater wall thickness. After a delay which allows the product of the correction to reach the ultrasonic device, the box is again moved if necessary, until the critical parameter is within the predetermined range.
REFERENCES:
patent: 3914356 (1975-10-01), Dembiak et al.
patent: 3916676 (1975-11-01), Boggs et al.
patent: 3923439 (1975-12-01), Isley et al.
patent: 4150929 (1979-04-01), Brandt
patent: 4152380 (1979-05-01), Graves et al.
patent: 4551289 (1985-11-01), Schwab et al.
patent: 4605525 (1986-08-01), Baxter
patent: 4663097 (1987-05-01), Hatfield
patent: 4740146 (1988-04-01), Angelbeck
patent: 4768940 (1988-09-01), Poiesz
patent: 4793788 (1988-12-01), Borger et al.
patent: 4882104 (1989-11-01), Dobrowsky
patent: 5094600 (1992-03-01), Sikora
patent: 5120212 (1992-06-01), Reiber et al.
patent: 5123823 (1992-06-01), Banjo et al.
patent: 5286183 (1994-02-01), Tonsi et al.
patent: 5303141 (1994-04-01), Batchelder et al.
patent: 5346379 (1994-09-01), Wolfl et al.
Sonoco Products & Company
Thurlow Jeffery R.
LandOfFree
Method and apparatus for extruding plastic tubing does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for extruding plastic tubing, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for extruding plastic tubing will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1721958