Testing the Heat Resistance of Sewing Threads
When sewing leather, jeans or other heavy fabrics, high friction forces between needle and sewn material occur. The needle can become very hot to such an extent that synthetic sewing threads can melt or even damage the sewing material. A high-performance yarn lubricant improves the heat resistance of the threads. It works by dissipating the accruing heat from the hot needle so the sewing process can run smoothly.
Before the infrared (IR) needle temperature measurement was developed, the heat protection efficiency of the yarn lubricant was tested with so-called failure tests. With this testing, the thread was sewn on an increasing number of fabric layers until it ruptured. A detailed conclusion about the temperature development at the sewing needle and the effectiveness of the thread finishing was limited with this testing method.
Contact-Free IR Needle Temperature Measurement
Together with the German Institutes of Textile and Fiber Research Denkendorf (DITF), we have developed a modern contact-free measuring method in an industrial research project. The resulting infrared (IR) testing procedure enables us to measure the needle temperature without contact. This way the actual temperature rise at the sewing needle can be recorded precisely and evaluated in real time during sewing. This is the basis for the successful enhancement of our modern, highly efficient yarn lubricants.
The IR testing method allows the determination of the efficiency of sewing thread lubricants during the sewing process. This way, different yarns, add-on quantities and products can be objectively compared to each other.
PERIFIL and PERIXEN Lubricants: Heat Protection for Sewing Threads
Here are some of our highly effective yarn lubricants from our range for sewing and embroidery threads which offer excellent heat protection during the sewing process:
- PERIXEN CML/R
Cold melt for the application by lick roll or precision pump, anhydrous product for cold application, exceptional heat protection and gliding properties, adhesion of PERIXEN CML/R is very good, so there is almost no abrasion during sewing
- PERIXEN LRH
Hot melt for sewing threads and embroidery yarns made of polyester and polyamide, suitable for application by lick roll or precision pump, anhydrous product for coating via heated machines, excellent heat protection and gliding properties for sewing threads subjected to very high demands
- PERIXEN SLH/R
Non-aqueous hot melt for lubrication of PES and PA sewing threads, application by Single Lub Hot technique, PERIXEN SLH/R allows proper sewability of lubricated yarns even under severe conditions
- PERIFIL PA 45
Anhydrous lubricant for sewing threads made of polyester, polyamide and cellulosic fibers, application by lick roll technique, PERIFIL PA 45 improves friction values and frictional properties of treated threads, allows proper sewability
- PERIFIL PA 60
Lubricant for sewing and embroidery threads made of PES and PA, emulsion for application by lick roll or precision pump, product for highest demands in terms of heat protection and gliding properties, stick-slip effect is avoided, lubricated threads have increased abrasion resistance
IR Method Allows Objective Comparison of Threads and Lubricants
By means of the contact-free needle temperature measurement which we co-developed, we can objectively compare sewing threads and lubricants in order to control the efficiency of existing finishing processes. By evaluating the test results, we can review the products and quantities used, and work with you to develop your saving potential. We are pleased to offer our laboratory services for the optimization of your processes.
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