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Development of a method and technology for the production of 3D knitted reinforcement grids Cover

Development of a method and technology for the production of 3D knitted reinforcement grids

Fibres & Textiles in Eastern Europe
Volume 30 (2022): Issue 3 (October 2022)
By: Konrad Zierold,  Julius Steinberg,  Lars Hahn,  Steffen Rittner,  Danny Friese and  Chokri Cherif  
Open Access
|Aug 2022

Figures & Tables

Fig. 1

Left: conventional scrim with constant yarn section lengths; right: scrim developed at ITM with variable warp yarn section lengths [11]
Left: conventional scrim with constant yarn section lengths; right: scrim developed at ITM with variable warp yarn section lengths [11]

Fig. 2

Development goal: Distortion-free 3D geometry (exemplary shell segment for textile concrete applications), length (l), width (w)
Development goal: Distortion-free 3D geometry (exemplary shell segment for textile concrete applications), length (l), width (w)

Fig. 3

Functional diagram of the weft reserve formation process for multiaxial warp knitting machines
Functional diagram of the weft reserve formation process for multiaxial warp knitting machines

Fig. 4

Preferred concept for the design-technological implementation of the complete forming unit system for weft reserve formation
Preferred concept for the design-technological implementation of the complete forming unit system for weft reserve formation

Fig. 5

Preliminary tests to investigate the demoulding behaviour of a carbon roving; marked in red: shaping direction (top view)
Preliminary tests to investigate the demoulding behaviour of a carbon roving; marked in red: shaping direction (top view)

Fig. 6

Technology concept and motion path of the functional elements
Technology concept and motion path of the functional elements

Fig. 7

Kinematic principle of operation of the weft reserve system
Kinematic principle of operation of the weft reserve system

Fig. 8

Schematic diagram of the mechanism for moving the forming unit (A0, B0: pivot points of the drive)
Schematic diagram of the mechanism for moving the forming unit (A0, B0: pivot points of the drive)

Figure 9

Schematic diagram of the mechanism for moving the forming element within the movement of the demoulding unit
Schematic diagram of the mechanism for moving the forming element within the movement of the demoulding unit

Fig. 10

Movement profile of the counterholder: in the production direction (xf) (left), and: in the yf direction (right)
Movement profile of the counterholder: in the production direction (xf) (left), and: in the yf direction (right)

Fig. 11

Shaping unit developed for forming the weft reserves
Shaping unit developed for forming the weft reserves

Fig. 12

Implemented test rig with exemplary representation of the (weft) yarn reserves realised
Implemented test rig with exemplary representation of the (weft) yarn reserves realised

Fig. 13

Representation of the gearbox system of the test rig developed for forming a weft reserve (side view)
Representation of the gearbox system of the test rig developed for forming a weft reserve (side view)

Fig. 14

Spacing of a glass thread (linear density 1200 tex)
Spacing of a glass thread (linear density 1200 tex)

Materials used, basic textile machinery and restrictions

position0°90°
manufacturerTeijin Carbon Europe GmbH, Wuppertal (Germany)
materialCarbonfilament yarn
linear densitiy in tex800 – 3200
thread distance in mm3035
development aimModular retrofit on an existing multiaxial warp knitting machine (Karl Mayer Malimo 14024, working width 50″)

Deformation of the carbon roving

height in mmwidth in mm
carbon roving laid0.215.0
carbon roving shaped5.12.4

Comparison of speeds theoretically determined and measured using a representative measurement point to identify TARGET/ACTUAL deviations as a function of the engine speed

PointEngine speed in m−1Velocity (measured) in mm/sVelocity (theoretically) in mm/sDeviation in mm/sPercentage of deviation
124collision637.60--
12244.90215.4129.4912.04
6122.20107,7014.5011.87
224collision65.43--
1223.9922.101.897.88
611.3411.050.292.56
324collision26.67--
129.259.010.242.59
64.604.510.091.96
DOI: https://doi.org/10.2478/ftee-2022-0018 | Journal eISSN: 2300-7354 | Journal ISSN: 1230-3666
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Language: English
Page range: 18 - 26
Published on: Aug 23, 2022
Published by: Łukasiewicz Research Network, Institute of Biopolymers and Chemical Fibres
In partnership with: Paradigm Publishing Services
Publication frequency: Volume open
Keywords:
Composites,
mulitaxial warp knitting,
multi-curved surfaces
Related subjects:
Business and economics,
Business management,
Business informatics,
Process management,
Industrial chemistry,
Cellulose, paper and textiles,
Polymer science and technology,
Materials sciences,
Biomaterials and natural materials

© 2022 Konrad Zierold, Julius Steinberg, Lars Hahn, Steffen Rittner, Danny Friese, Chokri Cherif, published by Łukasiewicz Research Network, Institute of Biopolymers and Chemical Fibres
This work is licensed under the Creative Commons Attribution 3.0 License.

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