DE2254026A1 - METHOD AND DEVICE FOR MEASURING CURLING - Google Patents

Description

A3GW3167O

Method and device for measuring curling

A k ζ ο GmbH

Wuppertal

The invention relates to a method for the rapid measurement of Crimping of textured yarns, in particular bicomponent yarns.

The curling (EK) is defined as follows!

EK = ^L ° ~ ^Ll . ^1OO% '

^L O

where L _{Q is} the drawn _{length and L 1 is} the crimped length of the yarn.

Several methods are known for measuring the crimping, which are based on the fact that a strand under defined conditions loaded with a certain weight (determination of L) and is then relieved again (L.). The crimping in percent is calculated from this using the above formula. Also the DIN draft 53 84o of August 1971 for determining the curl is based on these test methods.

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For the quick testing of samples in operation, especially for sorting bobbins, the methods mentioned are too expensive and with regard to strand production, heat treatment, Drying, air conditioning, etc. also too tedious.

It is therefore the task of a method for measuring the Indicate crimping, which above all works quickly, delivers easily reproducible values and also low requirements to the test person.

The object is achieved according to the invention in that a defined Length of a horizontally clamped yarn under a preload of 0.05 p / dtex briefly by a certain amount Percentage stretched, relieved to develop the crimp and then tightened again to the horizontal, where the curling can be read off directly as a percentage.

The percentage of elongation is determined for the respective material with the help of the force-elongation diagram. It has an elongation percentage of 5 to 2o% was found to be advantageous. It is not so much the percentage that is important, but what is essential is that the same for all tests of the same material Percentage is used.

The invention also relates to a device for carrying out the method, which is characterized in that that in a frame consisting of two parallel, vertical plates with central bracing, two arranged one behind the other Running rails are stored horizontally, a first thread clamp provided with a pointer and handle on both running rails and a second Fadenklercme are slidably arranged on the front rail and that the central strut above the Slide rails one after the other in the area of the first clamp

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both sides horizontally extending percentage scale ,, between two terminals of a mirror with horizontally extending in the height of the thread clamping point measurement mark _f to the right of the second terminal in height of the thread clamping points a Zyllnderstift and below the line connecting the second terminal and transmits pin a likewise horizontally extending measuring mark "

The invention is explained in more detail by the following drawings:
Show it:

1 : an embodiment of the device according to the invention,

Flg. 2 : Schematic of the various settings for EK measurement,

3 : the reproducibility of the EK measured values ₀

The frame 1 according to Fig. 1 consists of two parallel, vertical ones Plates 2,3 and a central strut 4 »In the plates 2,3 are two running rails arranged one behind the other 5.6 stored horizontally. A first thread clamp 9 provided with a Seiger 7 and handle 8 can be displaced on both running rails 5, 6 arranged, a second thread clamp Io is displaceable on the front rail 5. The central brace 4 is in the area of the first thread clamp 9 with one to the left or provided on the right horizontally running percentage scale 11. Between the two terminals 9, Io, a mirror 12 is at the same height the thread clamping points of horizontally extending measuring mark 13 attached to the central strut 4. To the right of the second Thread clamp Io, preferably at a distance of 7.5 cm, carries the middle! bracing 4 at the height of the thread clamping points a cylinder pin 14. Below (15 mm) the connecting line between terminal Io and pin 14 there is also one horizontally running measuring mark 15.

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To carry out the curling measurement, the clamps 9, Io set at a distance of 50 cm, for example; The pointer 7 of the left terminal 9 points to the "O" of the percentage scale 11 (see measurement setting I according to FIG. 2). Then it will be a certain length of yarn 16 is removed from a cop to be tested and placed in the clamps 9, Io and over the pin 14. Terminal 9 is then tightened. The test person holds the right thread end tight and loads the thread 16 with a Prestress of o, oo5 p / dtex. The preload weight (not shown) is placed in the middle between the terminal Io and the Pin 14 is hung and raised by pulling the yarn 16 over the pin 14 until the hook of the weight is in the air the measuring mark 15 comes. Then the terminal Io is also tightened.

By moving terminal 9 to the left, the selected percentage is set the elongation for the yarn 16 (z. B. lo%) is set (measurement setting II). The stretching time is about 2 see. After the stretching process, the yarn 16 is driven by driving the clamp 9 relieved to the right to such an extent that it can fully develop its crimp (measurement setting III). Also this one The process only takes a few seconds. By moving the clamp 9 to the left again, the yarn 16 is up to the cover clamped with the measuring mark 13 of the mirror 12, so it is again taut in the starting position (measuring setting IV). The Einkräuöelung can then on the scale 11 directly can be read in percent.

To better differentiate the measured values from different To get bobbins it is sometimes advantageous if the thread is not completely horizontal when you measure the back is stretched, but sags slightly (a few mm) in the middle. In this case is below the measuring mark 13 on the Mirror 12 to apply another measuring mark,

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For an exact result, the value, which is slightly falsified by the slack in the thread, must of course be corrected will. ·

Fig. 3 shows the EK measured values for different cops of a Bicoraponent yarn dtex 15o f 48. The values obtained by test persons A-D are entered for each cop. The reproducibility the measured values turn out to be very good. Therefore, there are usually two to sort a cop Measurements sufficient.

The advantage of the measuring method according to the invention is not only that it can be carried out quickly and easily / it also consists compared to the strand method also in that the Investigation of the crimp evenness over relatively short lengths becomes possible.

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Claims (6)

Claims l.J Method for the rapid measurement of the curling of textured Yarns, in particular bicomponent yarns, characterized in that that a defined length of a yarn clamped horizontally under a preload of 0.05 p / dtex for a short time stretched by a certain percentage, relieved to develop the crimp and then back up again is tightened to the right of the Viaa, whereby the crimping can be read directly in percent. 2. The method according to claim 1, characterized in that the elongation percentage for the respective material with the help of the force-strain diagram. 3. The method according to claim 2, characterized in that the elongation percentage is preferably 5 to 2o%. 4. Device for performing the method according to the claims 1 to 3, characterized in that in a frame (1) consisting of two parallel, vertical plates (2,3) with central strut (4), two arranged one behind the other The running rails (5,6) are stored horizontally, on both running rails (5,6) one with pointer (7) and handle (8) provided first pad screen (9) and on the front rail (5) a second thread clamp (lo) are arranged displaceably and that the central strut (4) above the running rails (5,6) in the region of the first clamp (9) one after the other Percentage scale (11) running horizontally on both sides, between 409820/0489 BATH ORIGINAL . - 7 - A3GW3167O two clamps (9, lo) a mirror (12) with the level of the thread clamping points horizontally running measuring mark (13) _{f to the} right of the second terminal (lo) at the level of the thread clamping points a cylinder pin (14) and below the connection. the connection line of the second terminal (lo) and pin (14) also bears a horizontal measuring mark (15) «, 5. Apparatus according to claim 4, characterized in that the distance between the thread clamp (lo) and the cylindrical pin (14) is 7.5 cm. 6. Apparatus according to claim 4 _f, characterized in that the measuring mark (15) is arranged 15 mm below the connecting line. ■ 409820/0489