Based on the assumption that the solid plug existed in the grooved
melting zone and then was ruptured into upper solid plug and lower solid plug, some researchers  suggested that main source of the melting heat was the internal friction heat generated by two solid plugs, which were in the barrel groove and the screw channel, respectively, rubbing against each other.
Georg Menges and a group of associates at the IKV at Aachen University published guidelines on using grooved
In addition, a trench carrying a flanged or welded pipe must be nearly twice the width of a trench carrying a grooved
line, so using grooved
technology lowers labour and time requirements, as well as the environmental impact.
pipe joining method -- which dramatically reduces the amount of installation time as compared to welding, threading or flanging -- is now used extensively in a variety of piping applications.
Obviously, the biggest difference between grooved
and welded piping is the use of flame.
A drilled and/or grooved
cover will "act" softer than a plain cover.
In the comparison pictures, the knurled and standard grooved
pins clearly show signs of damage from installation as the bottom halves of the expanded diameter have been skived off.
The active grooved
feed section is characterized by the possibility to change the constructional features during the extrusion process without the necessity to stop the extrusion process.
Since the end of the 1950s, extensive research on grooved
feed extruders has been carried out [3-7].
Essentially, in a grooved
feed extruder, the conveying and pressure build-up tasks are assigned to the feed section.
A new helically cut, cross-laminated HDPE film from Ole-Bendt Rasmussen, inventor of tear-proof Valeron films in the 1950s, starts out as blown film that is slit into layflat and longitudinally stretched and embossed with intermeshing grooved
rollers that leave thin parallel lines.