# US 2021/0274718 A1 · Covering system for silage preparation

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- Number: US 2021/0274718 A1
- Document ID: US20210274718A1
- Status: Published application
- Kind: A1
- Application number: 16/336,631
- Filed: 2017-09-07
- Published: 2021-09-09
- Earliest claimed: 2016-09-29
- Assignees: RKW Agri GmbH & Co. KG
- Applicants: RKW Agri GmbH & Co. KG
- Inventors: Estelle Cheret
- Web page: https://patentgrep.com/patent/US20210274718A1

## CPC

- A01F 25/13: Coverings (A01F25/14 takes precedence)
- B32B 5/18: characterised by features of a layer {of} foamed material
- B32B 7/06: permitting easy separation
- B32B 27/06: as the main or only constituent of a layer, {which is} next to another layer of {the same or of} a {different material (next to a layer of a particular substance B32B9/045; next to a bituminous or tarry layer B32B11/046; next to a water setting substance layer B32B13/12; next to a metal layer B32B15/08; next to a glass layer B32B17/10; next to a layer formed of natural mineral fibres or particles B32B19/045; next to a wood layer B32B21/08; next to a cellulosic plastic layer B32B23/08; next to a natural or synthetic rubber layer B32B25/08)}
- B32B 27/08: of synthetic resin
- B32B 27/18: characterised by the use of special additives
- B32B 27/20: using fillers, pigments, thixotroping agents
- B32B 27/306: {comprising vinyl acetate or vinyl alcohol (co)polymers}
- B32B 27/308: {comprising acrylic (co)polymers}
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- B32B 27/34: comprising polyamides
- B32B 27/36: comprising polyesters
- B32B 2250/24: All layers being polymeric
- B32B 2307/402: Coloured
- B32B 2307/581: Resistant to cut
- B32B 2307/71: Resistive to light or to UV
- B32B 2307/712: Weather resistant
- B32B 2307/7244: Oxygen barrier
- B32B 2307/7246: Water vapor barrier
- B32B 2307/732: Dimensional properties
- B32B 2410/00: Agriculture-related articles
- A01F: PROCESSING OF HARVESTED PRODUCE; HAY OR STRAW PRESSES; DEVICES FOR STORING AGRICULTURAL OR HORTICULTURAL PRODUCE (devices for topping or skinning onions or flower bulbs A23N15/08)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM

## Abstract

A covering system for silage preparation. The covering system (1) includes at least one underlay film (2), which rests on the surface of a feedstuff (6). The underlay film (2) has an oxygen barrier layer (3). At least 50 wt % of the oxygen barrier layer (3) is formed of one or more material/s from the group including polyamide, co-polyamide, polyester, co-polyester, polyethylene, ethylene vinyl alcohol, polyvinyl alcohol, or mixtures thereof. The underlay film (2) also has an inner protective layer (4) facing the silage.

## Claims

### Claim 1

A covering system (1) for silage preparation comprising:
at least one underlay film (2) adapted to closely hug onto a surface of a fodder material (6), the underlay film (2) includes
at least one oxygen barrier layer (3), at least 50 wt. % whereof is formed of materials of the group consisting of polyamide, copolyamide, polyester, copolyester, polyethylene vinyl alcohol, polyvinyl alcohol, or mixtures thereof, and
at least one protective layer (4) that is adapted to protect the at least one oxygen barrier layer (3) against substances of the silage.

### Claim 2 (depends on 1)

The covering system as claimed in claim 1, wherein at least 50 wt. % of the protective layer (4) is formed of materials from the group consisting of polyethylene, polypropylene, copolymers of ethylene with other vinyl monomers and copolymers of propylene with other vinyl monomers, ethylene vinyl acetate (EVA) or ethylene butyl acrylate (EBA).

### Claim 3 (depends on 1)

The covering system as claimed in claim 1, wherein the underlay film (2) has a thickness of at most 50 μm.

### Claim 4 (depends on 1)

The covering system as claimed in claim 1, wherein the oxygen barrier layer (3) is thicker than the protective layer (4) at least by the factor 1.4.

### Claim 5 (depends on 1)

The covering system as claimed in claim 1, wherein the underlay film (2) has an oxygen permeability according to DIN 53380-3 at 23° and 50% relative humidity of at most 500 cm3/m2·d·bar.

### Claim 6 (depends on 1)

The covering system as claimed in claim 1, wherein the underlay film (2) has a water vapor permeability according to ISO 15106-3 at 23° C. and 85% relative humidity of at least 5 g/m2·d.

### Claim 7 (depends on 1)

The covering system as claimed in claim 1, wherein the at least one oxygen barrier layer (3) of the underlay film (2) further includes at most 20 wt. % of further polymeric constituents.

### Claim 8 (depends on 1)

The covering system as claimed in claim 1, wherein the at least one oxygen barrier layer (3) of the underlay film (2) is formed form at least one of polyamide or copolyamide.

### Claim 9 (depends on 1)

The covering system as claimed in claim 1, wherein the underlay film (2) in at least one of the at least one oxygen barrier layer or the at least one protective layer (3, 4) contains at least one of additives for increasing a stability against UV radiation, lubricants, mineral antiblock additives for reducing coefficients of friction of the film surface, or coloring additives.

### Claim 10 (depends on 1)

The covering system as claimed in claim 1, further comprising a silo film (5) which with the underlay film (2) forms a unit for covering in one operation, wherein the unit is formed in that the underlay film (2) and the silo film (5) are at least one of rolled up or folded together for combined unrolling, unfolding, or both in one operation.

### Claim 11 (depends on 10)

The covering system as claimed in claim 10, wherein the underlay film (2) is separable from the silo film (5) for closely hugging the surface of the fodder material heap (6).

### Claim 12 (depends on 10)

The covering system as claimed in claim 10, wherein the silo film (5) has a lower water permeability than the underlay film (2).

### Claim 13 (depends on 10)

The covering system as claimed in claim 10, wherein the silo film (5) has a water vapor permeability according to ISO 15106-3 of at most 3 g/m2·d.

### Claim 14 (depends on 10)

The covering system as claimed in claim 10, wherein at least 70 wt. % of the silo film (5) is formed of one or more materials from the group consisting of:
low density polyethylene (LDPE),
medium density polyethylene (MDPE),
high density polyethylene (HDPE),
copolymers of ethylene and α-olefins (LLDPE),
copolymers of ethylene and vinyl acetate (EVA),
copolymers of ethylene and acrylic acid, methacrylic acid or esters thereof,
ethylene butyl acrylate (EBA),
polypropylene (PP), or
heterophasic (block co-PP) or homogeneous (random CE-PP) copolymers of propylene and ethylene.

### Claim 15 (depends on 10)

The covering system as claimed in claim 10, wherein the underlay film (2) and the silo film (5) are produced together by coextrusion with low interlayer adhesion for separation of the underlay film (2) from the silo film (5).

### Claim 16 (depends on 10)

The covering system as claimed in claim 10, wherein at least one of the silo film or the underlay film has in at least one layer a foam structure for the separation of the silo film (5) from the underlay film (2).

### Claim 17 (depends on 10)

The covering system as claimed in claim 10, wherein the silo film (5) has a thickness of at least 50 μm.

### Claim 18 (depends on 1)

The covering system as claimed in claim 1, wherein the protective layer (4) is separated from the oxygen barrier layer (3).

### Claim 19 (depends on 1)

A roll with a covering system as claimed in claim 1.

### Claim 20 (depends on 10)

A method for silage preparation comprising the following steps:
applying a covering system (1) as claimed in claim 10 in which the underlay film (2) together with the silo film (5) is applied in one operation onto a fodder material heap (6),
the underlay film (2) detaching from the silo film (5) through soaking of moisture from the heap (6) and the underlay film hugging a surface of the fodder material heap (6).

### Claim 21

(canceled)