The present invention concerns an expander roller for fold-free expansion of foils, widths of paper or textile e.g. This expander roller with length L obliquely implanted with elastic brush plugs at his outer circumference in order to spread said foils or widths of different materials.
Such an expander roller is known by the German Patent DE102004 038 165.8, filed Jun. 8, 2004, titled: “Verfahren zum Spreizen von laufenden Bahnen”, inventor Rolf Hessenbruch, Remscheid, Germany. This patent describes a method and device formed as a roller in order to spread thin widths of material, which are forced to move over the circumference of said roller covered with brush plugs. Mentioned spreading of expanding roller device has obliquely implanted elastic brush plugs in rows. These rows of brush plugs are obliquely implanted from the middle of the axle to the left and to the right of the support structure. Then the known expander roller has some further modifications in implanting the brush parts in an elliptic way around the circumference of the roller (figure 8) in order to create a bigger distance between the row of brush plugs. This creates a spread in motion and cross direction of the thin width or foils. The surface of the brush plug has somewhat the shape of a wave and is firstly obliquely cut in the axial direction of the roller.
A drawback is, that the very intensive placing or mounting of the brush plugs in intensive rows on the circumference react to an incomplete and not uniform spreading or expanding force on the foils or widths, which widths forced under pressure around a segmental part of the expander roller. Furthermore, due to the intensive placing of the brush plugs in general, with little intermediate distance, the production costs will increase, which is not a very economical solution. This also applies to the elliptical placing of the brush plug around the circumference of the expander roller. It is rather complicated and it does not have the desired effect.
Therefore the aim of our invention is to overcome mentioned drawbacks and to provide an expander roller that operates more efficiently and is less costly to manufacture.
The expander roller according to the invention for the fold-free expansion of foils e.g. is characterized in that said expander roller is a type built-up roller tube with a total circumference radius R, a usable length of 2×L/2 and placed with his ends in a support structure for free rotation, wherein said circumference surface consists of a grid of obliquely implanted brush plugs with a free length t, wherein said brush plugs form an angle alpha (α) in axial direction of length L/2 to the two ends of the expander roller with the vertical placed on the outer circumference and with an angle partly beta (β=α/p) with the normal in the tangential direction, wherein the mutual centre distance of the brush plugs in the rows is X in said axial direction, wherein the mutual distance of said radial distances of the brush plugs is determined by the centre angle beta (β) and the radius r of the expander roller and wherein each following axial row of brush plugs on the circumference is shifted ½× to each other in axial direction.
The advantage is a very economical executed expander roller, that in practice operates to expand thin material widths with better results.
Furthermore the expander roller according to the invention is developed in such a way, characterized in that the dimensions of the expander roller for R is between 50 mm and 500 mm, preferably 200 mm, r is between 25 mm and 400 mm, preferably 150 mm and L is between 1000 mm and 5000 mm, preferably 2500 mm in which said angle alpha (α) is between 7 degrees and 25 degrees, preferably 12 degrees and said angle partly beta (β=α/p) is between 0.2 alpha and 0.5 alpha, preferably 0.25 alpha.
The advantage is that for each application an optimal solution can be produced in an economical way by varying X and the angle β.
Next, the expander roller according to the invention is developed in such a way, characterized in that said length t of the obliquely implanted brush plugs is between 5 mm and 25 mm, preferably 12 mm and wherein the material of the obliquely bended brush roller is a synthetic material such as polypropylene, wherein the diameter of said plug thread is between 0.1 mm and 0.8 mm, preferably 0.25 mm.
The advantage is brush plugs which can be adapted for optimal application in the spreading of all kinds of material widths.
A preferred embodiment of the present invention will now be described with reference to the accompanying drawing, in which:
Number | Date | Country | Kind |
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19075008.3 | May 2019 | EP | regional |