Spiderless inline-designed heads are said to result in no
spider lines and allow room for more air, thus eliminating cold legs, which can inhibit product output, according to the company.
Battenfeld Gloucester Engineering showed its newly redesigned Opticell foam sheet die for producing single or double PS or PE webs with no
spider lines. It has removable inner and outer die lips and QuickGap on-the-fly adjustments to vary die diameter to extrude a range of web widths.
This causes weld-lines, knit lines, or
spider lines in the wall of a pipe when two separated melt streams recombine, and they run the whole length of the finished pipe.
Corma's latest die advance is a new spider shape that overlaps strips of plastic, thus hiding
spider lines and making stronger pipe, Corma says.
Key benefits of the Series 900 technology are said to include the achievement of concentricity of product roundness, which greatly reduces material usage compared with other types of extrusion tooling; spiderless inline designed heads result in no
spider lines and allow room for more air, thus eliminating cold legs, which can inhibit product output; the system runs one to five layers simultaneously; and it is engineered for a multitude of applications, including special fluoropolymer applications.