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Cubicle Roll CR 20

DLG-APPROVED "Deformability/Elasticity, Permanent Tread Load, Abrasion, Slip resistance"

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The approval

A quality mark “DLG-APPROVED for single value-determining criteria” is awarded to agricultural products which successfully passed a smaller-scope DLG usability test according to independent and recognized evaluation criteria. The test intends to highlight special innovations and key criteria of the test item.
The test can focus on criteria from the DLG testing framework for full tests or on other individual features or qualitative criteria. The minimum requirements, the test conditions and procedures as well as the evaluation guidelines of the test results are determined in consultation with a DLG expert group. They comply with the generally recognized technology rules as well as with scientific and agricultural know­ledge and requirements. The successful test concludes with the publishing of a test report and the awarding of a quality mark which is valid for five years following the award date.

The DLG Appoved Test “Deformability/Elasticity, Permanent Tread Load, Abrasion, Slip resistance,”
includes technical measurements on test stands of the DLG Test Center. The deformability and elasticity,
the abrasion resistance, the slip resistance, were measured and a permanent tread load was applied.
The test was based on the DLG Testing Framework for elastic stable flooring, as of April 2010. Other criteria were not investigated.

Assessment – Brief Summary

The DeLaval cubicle roll CR 20 tested here, an elastic floor covering for the resting area in cubicle houses, was investigated with regard to durability and comfort properties on test stands in the DLG Approved Test. The deformability and elasticity, the abrasion resistance, the slip resistance, were measured and a permanent tread load was applied.

Table 1: Overview of results

Test characteristic Test result Evaluation *
Deformability and elasticity    
  – in new condition 10,2 mm +
  – following endurance test 9,6 mm +
Permanent tread load    
no lasting deformation + +
wear on the surface and on the small knops at the underside
Abrasion test    
good wear resistance +
Slip resistance**    
good slip resistance on dry and wet mat surface +

*    Evaluation range:: + + / + /◯ / – / – – (¡ = Standard)
**    Evaluation range:: + / -

The product

Description and Technical Data

Black, profiled cubicle rubber mat
 

  • approx. 20 mm tick
  • surface with a hammerstroke structure
  • underside with small and great conical knops
    - knops approx. 9 mm high
    - great knops diameter at the bottom: approx. 27 mm
    - small knops diameter at the bottom: approx. 14 mm
  • seamless installation
  • Shore A: approx. 78

The method

Deformability and elasticity

The deformability is measured in new condition and following permanent tread load using ball penetration tests with a calotte (r = 120 mm) and a penetration force of 2,000 N (corresponding to approx. 200 kg).

Permanent tread load

The permanent tread load is measured on a test stand with a round steel foot in the standard test programme with 100,000 alternating loads at 10,000 N (corresponding to approx. 1,000 kg). The steel foot is adapted to the natural conditions as an “artificial cow foot”. The foot has a diameter of 105 mm and therefore a contact area of 75 cm²; the carrying edge of the hoof is simulated by a 5 mm wide ring on the periphery of the sole that projects 1 mm above the rest of the surface.

Abrasion test

In a standardised abrasion test with 10.000 cycles the top cover was grinded with an emery cloth (granulation 280) and a grinding pressure of 500 N  (= 8.1 N/cm² surface pressure). The friction element was cooled continuous with water to prevent an influence of the generated heat during the abrasion test. The size of the grinded area was 61,5 cm².

Slip resistance

The measurements were carried out with the ComfortControl test rig of the DLG test centre. A loaded (10 kg) round plastic foot (105 mm diameter, with a contact area of 75 cm², 3 mm wide ring at the periphery of the ground) was pulled with a velocity of 20 mm/s across the mat.

The test results in detail

Deformability and elasticity

In the ball penetration tests in new condition with a calotte (r = 120 mm), penetration depth was 10.2 mm. The resulting calculated bearing pressure of 26.0 N/cm² indicates a relatively small load on the carpal joints when lying down and getting up. Elasticity was measured following a permanent tread load exerted by a steel foot (contact area: 75 cm²) with 100,000 alternating loads at 10,000 N. Following the endurance test, the penetration depth  of the calotte decreased from 10.2 mm to 9.6 mm. The bearing pressure increased from 26.0 N/cm² to 27.6 N/cm² (see Fig. 2). This means that deformability and elasticity slightly decrease.

Permanent tread load

Wear on the surface and on the small knops at the underside was observed on the rubber mat following exposure to permanent tread load on a test stand with 100,000 alternating loads at 10,000 N. No lasting deformation was observed.

Abrasion test

The abrasion depth after 10,000 cycles amounted to 2.5 mm, this corresponds to approximately 12 % of the rubber thickness. Of the ground surface 6.0 grams  were rubbed off. The abrasion depth and the  slight grit implicate a good wear resis­tance  of the rubber mat.

Slip Resistance

The slide pulling tests showed a good slip resistance on the dry or wet rubber mat surface in new condition. The measured friction coefficients (μ) all surpassed the minimal value of μ = 0.45 which speaks for a good foothold.

Summary

Based on test-stand investigations, the criteria tested in this DLG-Approved test for single value-determining criteria evaluate the comfort and durability properties of the DeLaval cubicle roll CR 20 for use in the resting area of high cubicles in cubicle houses.

The tested DeLaval cubicle roll CR 20 met the requirements of the Testing Framework with respect to the investigated criteria.

Applicant and test implementation

Applicant

Manufacturer and Applicant
DeLaval International AB site Glinde,
P.O. Box 1136,
DE-21509 Glinde/Germany

Contact
Telephon    +49 (0)4030 3344-308
Telefax    +49 (0)4030 3344-349
Mathias.Reichert@delaval.com
www.delaval.com

Test implementation

DLG e.V.,
Testzentrum Technik und Betriebsmittel,
Max-Eyth-Weg 1,
64823 Groß-Umstadt

The tests are carried out on behalf of the DLG by the DLG TestService GmbH as testing agency.

DLG test scope
DLG-APPROVED test for single value-determining criteria “Elastic Stable Flooring”
(current as of 04/2010)

Department
Indoor operations

Head of Department
Graduate engineer. agr. Susanne Gäckler

Test engineer(s)
Dr. Harald Reubold *

*    Author

Contact

DLG TestService GmbH - Groß-Umstadt location • Max-Eyth-Weg 1 64823 Groß-Umstadt Germany • Tel.: +49(0)69 24 788-611 • tech@DLG.org