BÖCK Silosysteme GmbH Silofolie BLUE 9

Table 1: Assessment in brief

Description and Technical Data

Light blue/black oxygen barrier silo foil polyethylene (PE) and ethylene vinyl alcohol copolymer (EVOH), UV-stabilized, nominal thickness 80 microns. The silo foil Blue 9 is produced in meters of webs up to 4 meters wide and produced with high-frequency welding technology to the desired width. The rollers are fitted with a protective case combination wrapped in foil with welded fleece. This is to avoid transport damage.

Table 2: Technical data (company information)

Individual widths and sizes available on request.

Suitability

The suitability of the silo film was determined on the basis of the laboratory results judged.

Film dimensions

The length and width of the silo foil are calibrated band measurement.

Film thickness

The film thickness is calculated in accordance with DIN 53370:2006-11, method P at +23 °C (stay with regenerate film the stalks are not taken into account).

Material quality

It is visually checked whether the film has a evenly has opaque colouring and is free of smears and pores.

Strength

Important parameters for the strength of a silo film are tearing force (per cm film width), tear resistance (based on the cross-section of the sample body) and the elongation of the rip (elongation of the specimen to the breaking). Tear force, elongation and tear resistance longi­tu­dinal, transverse and over folds are measured in accordance to DIN according to DIN EN ISO 527-3:2003-07 at +23 °C; test speed 500 mm/min; Type 2 sample body; deformation measurement between measuring marks, in new condition measured by acid storage. Acid storage: 10 days storage in mixed acid from 3 % milk, 1.5 % vinegar, 0.5 % butyric acid.

The penetration resistance of the film is applied in surface, fold and the weld based on DIN EN ISO 7765-1:2004-10, procedure A performed. In doing
so, the values specified by the manufacturer are checked.

Aging behaviour/weather resistance

The weathering of the material is controlled with xenon arc lamps according to DIN EN ISO 4892-2, method A, synchronisation with irrigation 102/18 to 2000 MJ/m2, black standard temperature 60 ±3 °C, relative humidity 65 ±3 %, EUV=60 W/m2. After that, the elongation of the tear is 527-3:2003-07 measured in transverse direction.

Change in measure after hot storage

The dimensional measured is changed in accordance with DIN 53377:2007-10 Change in moderation after 1/2 hour storage in +80 °C hot air.

Gas permeability

The gas permeability is determined according to DIN 53380-3: 1998-07 with oxygen at +23 °C; 0.2 bar, investigated.

Continuous monitoring audit

The product quality is determined according to the annually by a DLG monitoring audit controlled. In addition, the manufacturer must measures of self-control in production obliged.

Suitability

The silo foil Blue 9, light blue/black, UV-stabilized, 80 microns, is suitable for silage cover.

Film dimensions

The measured film dimensions corresponded to film length and film width of the declaration.

Film thickness

As an average value for the film thickness, 0.078 mm was determined. The measured microvalue was 0.074 mm and the measured maximum value was 0.082 mm. As a result, the requirements for the mean for the film thickness and the permissible deviations are of the average value have been complied with.

Material quality

The film was uniformly opaquely coloured, free of streaks and pores.

Strength

In new condition

The tearing force was 38.4 N/cm, transverse 36.2 N/cm and over folds 35.5 N/cm (minimum value 25 N/cm each). Taking into account the film thickness resulting in a tear resistance longitudinally of 49.9 MPa , across 46.7 MPa and over folds 44.5 MPa (minimum value 17 MPa each). The elongation at the break was 668 %, transver­sely 691 % and over folds at 656 % above the required minimum value of 400 %. The film thus fulfilled the requirements.

After acid storage

After ten days of storage in a mixed acid (3 % milk, 1.5 % vinegar and 0.5 % butyric acid) reduction in tear resistance transversely was 4.1 % (per-
missible ≤ 10 %); the reduction of the elongation of the transversely was 2.2 % (allowed ≤ 15 %). Acid resistance was thus given.

Dart drop resistance

When checking the penetration resistance in the surface, fold and weld are Manufacturer specified values area ≥ 650 g, fold ≥ 450 g and weld ≥ 650 g.

Aging behaviour/weather resistance

After simulation of a one-year natural outdoor ­weathering with 2000 MJ/m2, the elongation of the 686 % (minimum value 350 %), i.e. equivalent to a reduction in elongation of 0.7 % (permissible 10 %) related to the new state. Weather resistance was thus given.

Change in measure after hot storage

The dimensional changes after hot storage at 80 °C of warm air was longitudinally at -0.83 % and transversely -0.34 % below the permitted limit of ≤ 2 %. The temperature resistance was thus given.

Gas permeability

Oxygen permeability at 0.2 bar was film with 2.0 cm³/(m² · d) and at the weld with 2.1 cm³/(m² · d) lower than the maximum permissible value
250 cm³/(m² · d).