Improved yarn quality is a substantial competitive advantage for today’s spinning mills. Accotex cots are standard front cots accepted by the machine manufacturers, on both the regular and the compact spinning frames. Improving yarn values (evenness, thin places, and thick places) require a high-quality soft cot; the performance of this cot however depends largely on the proper preparation of the cot surface.
For a good performance the cot needs the correct surface roughness. In special applications UV treatment of the cots surfaces can be suitable.
Der Stein sollte nach jeweils 1500 Oberwalzen mit einem Diamanten abgeschliffen werden.
Der Stein muss alle 15 Minuten gereinigt werden, entweder mit Druckluft oder einer weichen Metallbürste
Nach der Montage müssen die neuen Bezüge alle auf den gleichen Außendurchmesser geschliffen werden.
Die Oberfläche des Bezugs ist nach dem Schleifen sauber und frei von Schleifstaub und Schleifschnitten.
Der Bezug hat nach dem Schleifen die richtige Oberflächenrauheit (Ra-Wert)
Use a measuring device which is calibrated
When the surface is cold, three single values should be measured around the circumference of the cot and should be averaged.
Schleifen Sie so schnell wie möglich und so lange wie nötig.
Semi automatic or fully automatic grinding machine:
The grinding results that should be achieved are:
| Type | Removel (OD) | Targeted roughness [µRa] (cold surface) |
| Ring spinning | 0.3 mm | 0.8 – 1.0 |
| Air-Jet spinning | 0.3 mm | 0.6 – 0.8 |
Grinding intervals:
| Hardness | Type | Recommend grinding interval |
| Soft cots | Ring spinning | 1 - 3 months |
| Medium cots | Ring spinning | 1 - 3 months |
| Hard cots | Ring spinning | 4 - 5 months |
| Soft cots | Air-Jet spinning | 7 - 15 days |
| Hard cots | Air-Jet spinning | 4 - 5 months |
1. Measure the outer diameter of the cot before grinding
2. We recommend starting with the following parameters:
*Total contact time=grinding time+polishing time
3. Measure the outer diameter of the cot after grinding; it should be
0.3 mm smaller now, measured on the cold surface
In the case of automatic measurement, check the measured values
regularly with a caliper gauge. We recommend the option "grinding
to size”.
4. If 0.3 mm diameter reduction has been achieved, please wait for the
cot surface to cool down and measure the Ra-value of the surface.
Semi automatic or fully automatic grinding machine:
The grinding results that should be achieved are:
| Type | Removel (OD) | Targeted roughness [µRa] (cold surface) |
| Ring spinning | 0.3 mm | 0.8 – 1.0 |
| Air-Jet spinning | 0.3 mm | 0.6 – 0.8 |
Grinding intervals:
| Hardness | Type | Recommend grinding interval |
| Soft cots | Ring spinning | 1 - 3 months |
| Medium cots | Ring spinning | 1 - 3 months |
| Hard cots | Ring spinning | 4 - 5 months |
| Soft cots | Air-Jet spinning | 7 - 15 days |
| Hard cots | Air-Jet spinning | 4 - 5 months |
1. Measure the outer diameter of the cot before grinding
2. We recommend starting with the following parameters:
For grinding stones with a grain of 120 and a porosity of 10:
3. Measure the outer diameter of the cot after grinding; it should be
0.3 mm smaller now, measured on the cold surface
4. If 0.3 mm diameter reduction has been achieved, please wait for the
cot surface to cool down and measure the Ra-value of the surface.