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Test Report 7337
The certification mark
The DLG QUALITY SEAL for operating equipment and consumables encompasses products, which are subjected to extensive testing of their value-determining and advertised characteristics. The tested criteria and the requirements to be fulfilled are specified by independent commissions and are designed – over and above legal requirements – to prove the product’s fitness for purpose, its advertised characteristics and practical requirements. Testing contents and requirements are developed further by the responsible specialist departments of the DLG e.V. in line with the applicable legislation, as well as with technical and scientific progress. Successful testing is concluded with the assignment of the DLG QUALITY SEAL.
The approved products are then published.
The DLG quality seal test included technical measurements on test benches, in the laboratory and in operational tests. On the test benches, the network length was measured and in the laboratory the maximum tensile force, the elongation at maximum tensile force, weather resistance and change in measure after hot storage. The test basis was the DLG test frame for high-density polyethylene round bale winding nets (PE-HD), as of November 2016.
Assessment in brief
The round bale winding net Polystar tested here was tested in the DLG quality seal test on test benches and in the laboratory for mechanical, physical and aging properties and measured the running length. In the practical investigations, the handling was assessed. The net is designed for the mechanical winding of bales made with round bales for silage preparation, hay and 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 % | ✔ |
The product
Description and technical data
Black-red-gold round bale winding net made of high-density polyethylene (PE-HD) 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%) | 12.4 g |
| Sleeve length (+/- 2 mm) | 1.246 mm / 1.260 mm |
| Sleeve inner diameter | 76 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 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 round bale winding net Polystar is suitable for the mechanical winding of with round balers manufactured bales from good for silage preparation, hay and straw. In practical use during the growing season in 2022, 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 12.4 g.
Table 3: Measured barrel lengths
| Nominal length | measured barrel length |
| 2,000 m | 2,146 m |
| 3,000 m | 3,097 m |
| 3,600 m | 3,648 m |
Strength
In new condition
The maximum tensile force measured by 7 threads was 388 N (minimum permissible value 300 N). Related to a network width of 1.23 m were used as an average 22.6 N/cm (minimum requirement 18.5 N/cm) and as Minimum value 22.2 N/cm (minimum requirement 17.5 N/cm). The breaking strength at maximum tensile force was longitudinally 21.8 % in the permitted range from 15 % to 25 %.
The winding net met the DLG requirements.
Aging behaviour/weather resistance
After simulation of a one-year natural outdoor weathering in the UV climate chamber (for Germany 2,000 MJ/m2) was the maximum tensile force measured on 7 threads 285 N and 15.6 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 16.0 % after artificial aging, i.e. it decreased by 26.6 % (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 29.1 % (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:
Telephone +49 (0)9072 9581-0,
Fax +49 (0)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. Ulrich Rubenschuh
Practical use
Stefan Wolf, 63110 Rodgau Weiskirchen
Tim Schachtschneider, 64853 Nieder Klingen
Willi Schüler, 64395 Brensbach Wallbach
Philipp Neubert, 64853 Otzberg
Test engineer(s)
Dr. Harald Reubold *
Special investigations
SKZ Testing GmbH, Friedrich-Bergius-Ring 22, 97076 Würzburg
Kunststoff-Zentrum in Leipzig gGmbH, Erich-Zeigner-Allee 44, 04229 Leipzig
DLG Test commissionStefan 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 us
DLG TestService GmbH - Groß-Umstadt location • Max-Eyth-Weg 1 • 64823 Groß-Umstadt • Tel: +49 69 24 788-600 • tech@DLG.org