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Test Report 7587
The certification mark
The DLG QUALITY SEAL for operating materials and consumables is awarded to products that have undergone comprehensive testing of their value-determining and advertised properties. Tested criteria and requirements to be fulfilled are determined by independent technical committees and are based – over and above legal requirements – on the intended purpose of the product, its advertised properties, and practical requirements. In line with applicable law and technical and scientific progress, the criteria and requirements are further developed by the technical committee and
the relevant specialist department of the DLG e.V. Successful testing is concluded with the award of the DLG QUALITY SEAL. The approved products are then published.
The tests include laboratory tests and practical tests. The test basis is the DLG test guidelines for the award and use of the DLG QUALITY SEAL for bale wrapping nets, as of November 2016.
Other criteria were not examined.
Assessment in brief
The round bale winding net PolyStar® was tested in the DLG quality seal test for mechanical, physical and aging properties and measured the running length. In the practical investigations, the handling was assessed.
The net is designed for machine wrapping of round bales of hay, silage, or straw.
Table 1: Assessment in brief
| DLG QUALITY PROFILE | Requirement | Evaluation* |
|---|---|---|
| Net length | ≥ nominal length at 5 % preload | ✓ |
| Meter weight | nominal meter weight ± 5 % | ✓ |
| Maximum traction force | ≥ 300 N (measured on 7 threads) | ✓ |
| Maximum traction | mean ≥ 18.5 N/cm | ✓ |
| Maximum tensile force | minimum-value ≥ 17.5 N/cm | ✓ |
| Elongation at maximum tensile force | 15 %-25 % | ✓ |
| Maximum pulling force after aging | mean ≥ 15.5 N/cm | ✓ |
| Elongation at maximum tensile force after aging | ≤ 30 % reduction in relation to new condition | ✓ |
| Change in measure after hot storage | shrinkage ≤ 30 % | ✓ |
* Evaluation range: requirements fulfilled (✓) / requirements not fulfilled (X)
The product
Description and technical data
Black-red-gold round bale winding net with red warning strips at the end of the roll. The winding net is UV-stabilized. It has a width of approx. 1.23 m or 1.25 m and is available in the running length 2,000 m, 3,000 m and 3,600 m.
Table 2: Technical data (company information)
| Main dimensions and weights | |
|---|---|
| Roller length | 2,000 / 3,000 / 3,600 m |
| Roller width (+/- 10 mm) | 1.23 m / 1.25 m |
| Rollers diameter (+/- 10 mm) | max. 280 mm |
| Weight per meter (+/- 5%) | 10.9 g |
| Sleeve length (+/- 2 mm) | 1.246 mm / 1.260 mm |
| Sleeve inner diameter | 76.6 mm |
| Packaging | foil hose |
| UV stabilizer | yes |
| Red warning strip last 50 m | yes |
The method
Suitability
The suitability as well as the possible use and the areas of application of the round bale winding net were assessed in a practical way.
Running length/meter weight
The barrel length is determined on a roller dynamometer without additional preload; the result shown includes a calculated preload of 5% on the measured length. The meter weight is on a 10 m long section.
Strength
The maximum tensile force and the elongation at maximum tensile force is determined in the new condition and after weathering of the material according to DIN EN ISO 527-3: 2003-07.
Aging behaviour/weather resistance
The weathering of the material is carried out in accordance with DIN EN ISO 4892-2, procedure A.
Change in measure after hot storage
The dimensional change is examined after one hour of storage at 120 °C in accordance with DIN 53377: 2007-10.
Detailed account of the test results
Suitability
The net is designed for machine wrapping of round bales of hay, silage, or straw.
In practical use during the growing season in 2025, the winding net has proven.
The cover of the bales from edge to edge was good.
Running length/meter weight
On a roller dynamometer, the running lengths specified in the table were measured for the specified net lengths.
The meter weight is 10.9 g.
Table 3: Measured barrel length
| Nominal length | measured barrel length |
| 3,000 m | 3,097 m |
Strength
In new condition
The maximum tensile force measured by 7 threads was 376 N (minimum permissible value 300 N). Related to a network width of 1.23 m were used as an average 21.4 N/cm (minimum requirement 18.5 N/cm) and as Minimum value 20.9 N/cm (minimum requirement 17.5 N/cm).
The breaking strength at maximum tensile force was longitudinally 21.6 % in the permitted range from 15 % to 25 %.
The winding net met the DLG requirements.
After aging/weather resistance
After simulation of a one-year natural outdoor weathering in the UV climate chamber (2,000 MJ/m² (global radiation), corresponding to 215 MJ/m² in the wavelength range of 300 to 400 nm) was the maximum tensile force measured on 7 threads 297 N and 16.9 N/cm based on a mains width of 1.23 m (minimum permissible value 15.5 N/cm). The elongation at break at maximum tensile force amounted to 17.1 % after artificial aging, i.e. it decreased by 28.8 % (maximum permitted 30 %).
The weather resistance was given.
Change in measure after hot storage
The change in measure after one hour of storage at 120 °C was 29.3 % (maximum permitted 30 %).
The criteria tested in this DLG quality seal test are evaluated on the basis of test bench, laboratory and practical tests on the mechanical, physical and aging properties of the round bale winding net PolyStar®.
The tested round bale winding net PolyStar® has met the requirements of the test frame with regard to of the criteria examined.
Manufacturer and applicant
Applicant
Zill GmbH & Co. KG
Hanns-Martin-Schleyer-Straße 31
89415 Lauingen
Germany
Contact:
Tel. +49 9072 9581-0
Fax +49 9072 9581-30
info@zillnet.de , www.zillnet.de
Test implementation
DLG TestService GmbH,
Gross-Umstadt location
The tests are conducted on behalf of DLG e.V.
DLG test framework
Quality seal test „Round bale winding nets“
(current as of 11/2016)
Department
Operating resources
Head of Department
Dr. Michael Eise
Practical use
- Stefan Wolf, 63110 Rodgau Weiskirchen
- Tim Schachtschneider, 64853 Nieder Klingen
- Willi Schüler, 64395 Brensbach Wallbach
- Philipp Neubert, 64853 Otzberg
- Dr. Klaus Hünting, 47533 Kleve
Test engineer(s)
Alena Scholz *
Special investigations
- SKZ Testing GmbH, Friedrich-Bergius-Ring 22, 97076 Würzburg
- TZO Leipzig GmbH, Hornstraße 5, 04249 Leipzig
DLG Test commission
- Stefan Wolf, 63110 Rodgau Weiskirchen
- Christof Löffler, LAZBW Aulendorf, 88326 Aulendorf
- Karsten Bommelmann, AG FUKO, 26160 Bad Zwischenahn
- Willi Schüler, 64395 Brensbach Wallbach
- Dr. Klaus Hünting, VBZL Haus Riswick, 47533 Kleve
- Dipl.-Ing. Udo Dengel, SKZ Testing GmbH, 97076 Würzburg
* Author
Contact
DLG TestService GmbH - Groß-Umstadt location • Max-Eyth-Weg 1 • 64823 Groß-Umstadt • Tel: +49 69 24 788-600 • tech@DLG.org