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n. Layflat tubing - when plastic film or polythene is extruded, the polymer is melted and hot air is blown in to it to create a bubble. By cooling and pulling the polythene off the extruder a tube of film is created. This can be cut to create sheets or just folded and laid flat. In the latter case this creates what is simply known as lay-flat tubing.
Tubing is normally measured width (in inches) by length (in feet). Tubing can also be perforated at specific intervals, without seals. This perforated tubing is referred to as sleeves.
Gusseted tubing is tubing with pleats on each side allowing the tubing to expand beyond its layflat width. The gusset is considered to be the depth of the tube. For example a 8" x 4" x 500' tube would be 8 inches wide by 4 inches deep by 500 feet long.
Single Wound Sheeting (SWS) is sheeting wound up as a single layer. These must be ordered in even numbers (12 rolls, 22 Rolls, 100 Rolls...) Sheeting is measured width (in inches) x length (in feet) .This can also be ordered as POR sheets (measured width in inches by length in inches)
Double Wound Sheeting (DWS) is sheeting wound up 2 layers thick on a roll. Sheeting is measured width x length. The width is in Inches and the length is in feet.
C-Fold Sheeting is sheeting that is folded in half and wound up on a roll. It is measured width (in inches) x length (in feet). For example 12" x 100' C-Fold Sheeting will open up to a sheet that is 24" x 100' Sheeting This can also be ordered as POR C-Fold Sheets (measured width in inches by length in inches).
Centre Slit Sheeting is gusseted tubing with a slit down the centre of one layer of film. It is measured the same as the gusseted tubing. The slit down the middle allows the sheeting to open up to a flat sheet. For example a 25" x 15" x 100' Centre Slit sheeting will open up to be a sheet that is 80" wide by 100' long.
A form of centre folded sheeting where the upper surface is a different width to the lower surface. As the film is taken off the extruder a knife cuts the bottom sheet of the tubing to create 2 sides of unequal length.