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STATIMAT 4

Automatic Tensile Tester for high - tenacity yarns and monofilaments



STATIMAT 4
  		Tensile tests on yarns with high count and breaking strength demand special requirements regarding clamps, measuring system, sample waste disposal and mechanical stability of the automatic testing equipment. This particularly applies for technical yarns comprising high-tenacity polymers such as Aramid or Polyethylene. Here force measurement limits of 1000 N and mechanical stress limitations for such test equipment are insufficient in most cases. In addition, the clamps of the automatic tensile testing equipment are often inadequate for withstanding breaking forces of this magnitude.
 
 
Moreover, for untwisted technical filament yarns, there is a demand to insert a certain amount of twist into the yarn prior to the tensile test. Compared with tests carried out on untwisted yarns, this method has the following advantages:
 
  • Better definition of the test and lower deviations for breaking force, elongation at break and work to rupture: During the testing of an untwisted multi-filament yarn, usually filament breaks occur one after another, whereas a twisted multi-filament yarn will break suddenly.
     
  • Close-to-practice tests: For most technical yarn applications, the yarn is twisted before being processed and subjected to use in its application.
     
 
  • Standardized test method: Various standards recommend or require tensile tests on technical yarns to be carried out after twist insertion,
    e.g. ASTM D 885, Note 9, ASTM D 2256, BISFA standards for Polyester- and Polyamide filament yarns.
     
  • Possibility for twist optimisation: Material properties which can be measured with the equipment such as tenacity and elongation, work to rupture, modulus, and reference values for force and elongation can be examined regarding the influence of twist. This enables determination of the optimum twist level for respective applications.
     
For these reasons, Textechno developed the automatic testing equipment STATIMAT 4, featuring innovative technical details that take into account the special requirements of technical filament yarns. Both the mechanical construction of the equipment and its force measuring range are suitable for maximum forces up to 5000 N. It is equipped with patented bollards located at both clamps (force reduction cams), which automatically swing in. The clamps are characterised by their outstanding clamping effect.
 

Patented rotary clamp
A patented automatic rotary clamp, which is integrated into the test section, inserts twist prior to commencement of the tensile test.
       
  
Application of twist prior to the tensile test with clamp type 4K
 

Specialized clamp types      

To provide specialized testing conditions to the different yarn types the STATIMAT 4 can be equipped with different clamp types. Bollard shapes and surfaces can be optimized also to the different yarn types.
Clamp 4K
Straight clamps
with 35 mm bollards
with twister		 Clamp 4I
Straight clamps
without bollard
with twister		 Clamp 4H
Straight clamps
with 35 mm bollards
without twister		 Clamp 4G
Straight clamps
without bollard
without twister
As applicable to the STATIMAT ME, in the STATIMAT 4 model there is also a possibility to use special clamps instead of the automatic yarn clamps, e.g. for fabrics or slivers and rovings.

Moreover, it is possible to carry out automatic yarn count measurements using an AUTOCOUNT module.
        

Testing methods


   
  • Static tensile testing   (standard software)
  • Cyclic load testing      (optional software)
  • Creep- and relaxation trials (optional software)

    on yarns, monofilaments*, fabrics* or slivers and rovings*
     

  • Yarn count measurements*.

    *requires additional modules or special accessories

STATIMAT 4 MONOFIL
As a further application the STATIMAT 4 MONOFIL is available for automatic testing of several monofil samples. More details ...
 

TESTCONTROL PC System
The TESTCONTROL PC system collects and statistically evaluates a multiplicity of relevant measured variables from both the tensile- and yarn count tests. It also controls the test process according to preselected parameters. The system can easily be integrated into any network.
 

System components
Test section:
  2 pneumatic yarn clamps with force reduction cams, automatic linear threading by auxiliary clamp, min. gauge length 40 mm, max. travel of draw-off clamp 880 mm for a 100 mm gauge length.
  
Package changer:
  Standard version with 24 positions, expandable to 48 positions.
    
Measuring systems:
  Force measuring device with easily exchangeable force transducers,
max. 5000 N;
Elongation measuring device with resolver, resolution 0.4 µm.
 
Twist insertion:
  Rotating auxiliary clamp situated below the draw-off clamp.
    
Yarn feed mechanism:
  Nip-roller system, max. yarn delivery speed of 300 m/min, resolution of length measurement 0.3 mm.
  
AUTOCOUNT:
  Yarn collection and weighing device, measuring range 0 - 310 g,
resolution 1 mg.
   
TESTCONTROL:
  PC system for controlling the test processes and for the evaluation of the measured data, connected via serial interface;
Textechno software as a WINDOWS application;
Input of all parameters for testing and measured data evaluation, saving of selected parameter sets under code words;
PC easily integrated into any network type.
 

Further technical data
Mains supply:
  220 V, 50 (60) Hz, current requirement approx. 1 A.
   
Compressed air supply:
  5 bar, 25 l/min (with AUTOCOUNT: 100 l/min).
 
Dimensions, weight :
  Height 1850 mm, width 910 mm (for 24 position package changer), depth 700 mm, approx. 290 kg.
    
The above technical contents can be subject to changes by TEXTECHNO.
 

 

Last modified: 09/28/07