DLG e.V. - Test: Cow mattress M45R

Cow mattress M45R Deformability/Elasticity, Permanent Tread Load, Abrasion, Slip resistance

Assessment – Brief Summary

The DeLaval cow mattress tested here, an elastic floor covering for the resting area in high cubicle loose housing barns, was investigated with regard to durability and comfort properties on test stands in the DLG Approved Test. The deformability and elasticity of the mattress, the abrasion resistance, the slip resistance were measured and a permanent tread load was applied. The deformability and elasticity in new condition and following permanent tread load were signi­ficantly better than standard.

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Table 1: Overview of results

Test characteristic Test result Evaluation*
Deformability and elasticity
– in new condition 23,3 mm + +
– following endurance test 24,0 mm + +
Permanent tread load
very low lasting deformation + +
after 250.000 movements no appreciable wear +
Abrasion test
good wear resistance +
Slip resistance**
good slip resistance on dry and wet mattress surface +

*    Evaluation range: ++ / + /◯ / – / –– (◯ = standard, k.B. = not evaluated)

**    Evaluation range: + / –

The Product

Cow mattress M45R

Description and Technical Data:

The M45R cubicle mattress tested here is an elastic floor covering

  • for the resting area of high cubicle loose housing barns
  • thickness of approx. 44 mm
  • Top cover
  • black rubber mat with fabric inlay
  • upper side with silkscreen structure
  • underside without structure
  • thickness approx. 4 mm
  • Shore A hardness: approx. 62
  • Mattress underlay made of approx. 40 mm thick PU/Latex foam sheet.
  • Laid as sheeting.

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).
Additional to the standard test programme with 100.000 alternating loads, 150.000 extra alternating loads were carried out. 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 23.3 mm. The resulting calculated bearing pressure of 11.4 N/cm² indicates a satisfactory 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 250,000 alternating loads at 10,000 N. Following the endurance test, the penetration depth of the calotte increased from 23.3 mm to 24.0 mm. The bearing pressure decreased from 11.4 N/cm² to 11.1 N/cm² (see Fig. 2). This means that deformability and elasticity slightly increase.

Evaluation
in new condition++
following permanent tread load++

Permanent tread load

No appreciable wear was observed on the cow mattress following exposure to permanent tread load on a test stand with 250,000 alternating loads at 10,000 N. The PU/Latex foam sheet was compressed and a very low lasting deformation of 2 mm was measured. Given an original height of ca. 44 mm, this means that the height of the mattress decreased by about 4 %. Up to 30 % is defined as standard.

Evaluation
no appreciable wear+
very low lasting deformation++

Abrasion test

The abrasion depth after 10,000 cycles amounted to 0.1 mm, this corresponds to approximately 3 % of the rubber thickness. Of the ground surface 0.5 grams were rubbed off.

Evaluation
The abrasion depth and the slight grit implicate a good wear resistance of the rubber mat+

Slip Resistance

he 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.

Evaluation
Good slip resistance on dry and
wet rubber mat surface
+

Figure 5: Test sample after abrasion test

Figure 6: Slip resistance measurement

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 cow mattress M45R for use in the resting area in high cubicle loose housing barns. The tested DeLaval cow mattress M45R met the requirements of the Testing Framework with respect to the investigated criteria.

DLG Test Center Technology and Farm Inputs

DLG e.V.
Max-Eyth-Weg 1
64823 Groß-Umstadt
Germany
Tel.: +49(0)69 24 788-611
tech(at)DLG.org

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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-APPROVED test for single value-determining criteria “Deformability/Elasticity, Permanent Tread Load, Abrasion, Slip resistance, Acid resistance, Cleaning distance” 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 at April 2010. Other criteria were not investigated.

Manufacturer and Applicant

DeLaval International AB site
Glinde, P.O. Box 1136,
DE-21509 Glinde
Germany

Contact:
Telephone: 040 3033 44-339
Fax: 040 3033 44-349
Andrea.Valsecchi(at)delaval.com
www.delaval.com

Test execution

DLG e.V.,
Test Center for
Technology and Farm Inputs,
Max-Eyth-Weg 1,
64823 Groß-Umstadt,
Germany

DLG Testing Framework
DLG Approved Test
“Elastic Stable Flooring”
(as at 04/2010)

Field
Indoor operations

Project manager
Dipl.-Ing. Susanne Gäckler

Test engineer(s)
Dr. Harald Reubold  *

* Reporting engineer