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

Konrad Zierold
Konrad Zierold
, 
Julius Steinberg
Julius Steinberg
, 
Lars Hahn
Lars Hahn
, 
Steffen Rittner
Steffen Rittner
, 
Danny Friese
Danny Friese
 oraz 
Chokri Cherif
Chokri Cherif
   | 23 sie 2022
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Article Category: Research Article
Data publikacji: 23 sie 2022
Zakres stron: 18 - 26
DOI: https://doi.org/10.2478/ftee-2022-0018
Słowa kluczowe
© 2022 Konrad Zierold et al., published by Sciendo
This work is licensed under the Creative Commons Attribution 3.0 Public License.

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

position 0° 90°
manufacturer Teijin Carbon Europe GmbH, Wuppertal (Germany)
material Carbonfilament yarn
linear densitiy in tex 800 – 3200
thread distance in mm 30 35
development aim Modular retrofit on an existing multiaxial warp knitting machine (Karl Mayer Malimo 14024, working width 50″)

Deformation of the carbon roving

height in mm width in mm
carbon roving laid 0.2 15.0
carbon roving shaped 5.1 2.4

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

Point Engine speed in m−1 Velocity (measured) in mm/s Velocity (theoretically) in mm/s Deviation in mm/s Percentage of deviation
1 24 collision 637.60 - -
12 244.90 215.41 29.49 12.04
6 122.20 107,70 14.50 11.87
2 24 collision 65.43 - -
12 23.99 22.10 1.89 7.88
6 11.34 11.05 0.29 2.56
3 24 collision 26.67 - -
12 9.25 9.01 0.24 2.59
6 4.60 4.51 0.09 1.96
eISSN:
2300-7354
Język:
Angielski
Częstotliwość wydawania:
6 razy w roku
Dziedziny czasopisma:
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
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