• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A multilayer film or sheet comprising a first layer of polyethylene and a second layer of polyethylene. The first layer has a first density and the second layer has a second density; these densities are different. The film or sheet also includes at least one core or inner layer of a polyethylene-based layer with oxygen barrier properties.
    公开号:BE1026531B1
    申请号:E20190018
    申请日:2019-02-28
    公开日:2020-03-11
    发明作者:Gary Buchalter
    申请人:British Polythene Ltd；
    IPC主号:
    专利说明:

    The present invention generally relates to films (a thin continuous polymer material) and plates prepared from polyethylene resins. More particularly, the invention relates to multilayer films and plates made from certain polyethylene compositions and polyethylene-based organic mixtures.
    Polyethylene is a polymer of ethylene; in particular: all different partially crystalline lightweight thermoplastics (CH2CH2) x that are resistant to chemicals and moisture, have good insulating properties, and are used, for example, in packaging and insulation. Polyethylene is a family of materials with densities usually ranging from 0.86 g / cm3 to 0.965 g / cm3.
    According to an aspect of the present invention, there is provided a multilayer film or sheet comprising a first layer of polyethylene of a first density and a second layer of polyethylene of a second density, wherein the first and second densities are different, and at least one core - or inner layer of a polyethylene-based layer with oxygen barrier properties.
    According to a further aspect of the present invention there is provided a multilayer film or sheet comprising a first polyethylene surface layer of a first density and a second opposite polyethylene surface layer of a second density, wherein the first and second densities are different; and at least one core or inner layer of a polyethylene-based layer with oxygen barrier properties.
    In some embodiments, the barrier layer (s) comprises a mixture of PE based organic raw material.
    According to an aspect of the present invention, there is provided a multilayer film or sheet comprising a first layer of polyethylene of a first density and a second layer of polyethylene of a second density, wherein the first and second densities are different, and an inner layer of
    BE2019 / 0018 a polyethylene based organic mixture with oxygen barrier properties.
    In some embodiments, the foil or sheet is a three-layer structure. Other embodiments have more than three layers, for example five layers.
    The inner layer can have a thickness in the range from 4 μm to 120 μm, for example about 8 μm or 12 μm for a foil structure and about 50 μm or 60 μm for a sheet structure.
    In some embodiments, the first layer is an outer layer and the second layer is an inner layer, i.e., the first and second layers are the skin on the top and bottom (in section) of the foil.
    In some embodiments, the first density is higher than the second density. This makes it possible, for example, to form a temperature differential in a foil when two sections of foil are heat-sealed together, for example with two respective inner layers facing each other.
    The first density can range from 0.910 g / cm3 to 0.965 g / cm3. For example, the first density may be about 0.931 g / cm3 for a sheet structure and about 0.920 g / cm3 for a sheet structure.
    For a film structure, the second density can range from 0.80 g / cm3 to 0.90 g / cm3. For example, the second density can be about 0.88 g / cm 3 .
    For a sheet structure, the second density can range from 0.90 g / cm3 to 0.965 g / cm3. For example, the second density can be about 0.92 g / cm3.
    The density of the core or inner layer can range from 0.95 g / cm3 to
    1.5 g / cm3. The density of the core layer can be, for example, about 1.1 g / cm 3 .
    BE2019 / 0018
    The first layer of a thin film can have a thickness in the range from 4 μm to 25 μm. For example, the first layer can have a thickness of about 15 μm.
    The second layer can have a thickness in the range from 4 μm to 30 μm. For example, the second layer can have a thickness of about 15.0 μm.
    The total thickness of the foil can range from 30 μm to 200 μm. For example, the thickness of the foil can be about 120 μm.
    The thickness of a plate can range from 200 μm to 1000 μm. The first layer can have a thickness in the range of 20 μm to 200 μm. The second layer can have a thickness in the range from 20 μm to 200 μm.
    A barrier layer can have a thickness in the range of 5 μm to 100 μm, for example about 10 μm for a foil structure and about 30 μm for a sheet structure.
    In some embodiments, the film is formed by a coextrusion process (the extrusion of multiple layers of material simultaneously), for example, a blown film coextrusion process (which involves the extrusion of a tube of molten polymer through an annular die and expansion to a size greater than the original diameter, to form a thin foil bubble). Plates can, for example, be formed using a sheet die.
    The present invention also provides a three-layer coextruded polyethylene film comprising an inner layer of polyethylene of a first density and an outer layer of polyethylene of a second density, wherein the first and second densities are different, and a core or inner layer of a polyethylene-based organic mixture between the inner and outer layers, the core or inner layer having oxygen barrier properties.
    In some embodiments, the barrier material is used only in the core layer.
    BE2019 / 0018
    In some embodiments, the material used to provide the barrier in the barrier / core layer is a PE-compatible organic food-approved blend.
    The present invention also provides a product, such as a bag, flow wrapping pack, tray or lid, formed from a foil or sheet as described herein. In some embodiments, all layers of the product are polyethylene or polyethylene-based organic blend, making it easy to recycle through standard polyethylene recycling channels.
    The present invention also provides for the use of commercially available adhesion builders in barrier layer adjacent layers to ensure consistency of the overall structure. Layer concentration of this additive can be between 10% and 100% and typically 20% when it is not in a separate layer of its own.
    The present invention also provides for the preparation of a polyethylene film for use in the manufacture of a disposable bag and bags formed therefrom.
    The present invention also provides an upright bag that is easily recyclable in the polyethylene recycling stream, the bag being formed of film as described herein and formed by sealing opposing panels of film with respective inner layers sealed together.
    In some aspects and embodiments, a film is designed to seal inner layer to inner layer with a temperature differential with the outer layer. In other aspects and embodiments, a shell structure provides an upper surface for sealing on a suitable lid. In other aspects and embodiments, a lid structure provides a bottom surface to seal to an appropriate scale.
    Different aspects and embodiments of the invention can be used individually or together.
    BE2019 / 0018
    Further specific and preferred aspects of the present invention are set out in the accompanying independent and dependent claims. Features of the dependent claims may, when appropriate, be combined with the features of the independent claims, and in combinations other than those set out explicitly in the claims.
    The present invention will now be more specifically described, by way of example, with reference to the accompanying drawings.
    The exemplary embodiments are described in sufficient detail to enable those skilled in the art to implement and implement the systems and processes described herein. It is important to understand that embodiments can be provided in many alternative forms and should not be construed as limited to the examples set forth herein.
    Thus, while embodiments can be modified in different ways and take different alternative forms, specific embodiments thereof are shown in the drawings and described in detail below as examples. It is not intended to be limited to the specific shapes described. On the contrary, all changes, equivalents and alternatives that fall within the scope of the appended claims should be included. Elements of the exemplary embodiments are designated consistently with the same reference numerals throughout the drawings and throughout the detailed description where appropriate.
    Unless otherwise defined, all terms used herein (including technical and scientific terms) should be interpreted as is common in the art. It will be further understood that terms in general use should also be interpreted as is common in the relevant art and not in an idealized or overly formal sense unless explicitly defined herein.
    In the following description, all orientational terms, such as top, bottom, vertical, horizontal, radial and axial, are used with
    BE2019 / 0018 relates to the drawings and should not be interpreted as limiting the invention.
    In Figure 1, a coextruded multilayer film is generally indicated as 10.
    The film 10 comprises a first, outer layer 15 of polyethylene, a second, inner layer 20 of polyethylene and a core, barrier layer 25 of polyethylene.
    The layer 15 is formed from polyethylene of a higher density than the layer 20. The layer 25 is formed from a PE-compatible organic food-approved composite resin with oxygen barrier.
    As shown in Figure 2, when two parts of the film are sealed together, the two layers 15a, 15b become outer layers and the two layers 20a, 20b are sealed together and inner layers become. The film can be heat-sealed using existing commercially available equipment because of the density gradient between layers 15a, 15b and layers 20a, 20b.
    In some embodiments, the layers are formed on the basis of heat resistance (which may correspond to density but not necessarily) with a PE layer of higher heat resistance formed as an outer layer and a layer of lower resistance formed as an inner layer, differential in temperature resistance across the thickness of the film.
    Figure 3 shows a foil 130 formed according to a further embodiment.
    The film 130 comprises, from the outside in, an outer layer 135 of medium density PE, a layer 140 of high density PE, a further layer 145 of high density PE, a barrier layer 150 of PE and an inner layer 155 of PE with low density. For sealing purposes, inner layer 155 would then seal against another such layer, the layer 130 forming both external surfaces.
    BE2019 / 0018
    Figure 4 shows a plate 260 formed according to a further embodiment.
    The film 260 comprises, from the outside in, an outer layer 265 of medium density PE, a barrier layer 270 of PE, a layer 275 of high density PE, a further barrier layer 280 of PE, and an inner layer 285 of low density PE. .
    Films and plates formed in accordance with the present invention can be used to produce, for example, recyclable upright bags, tray, lids and wrapping packages with oxygen barrier properties.
    Figure 5 shows the results of tests performed on a variety of different films (all of which are five-layer films with two barrier layers) formed in accordance with the present invention.
    While illustrative embodiments of the invention are disclosed herein in detail, with reference to the accompanying drawings, it will be understood that the invention is not limited to the precise embodiments shown and that various changes and modifications may be effected therein by those skilled in the art depart from the scope of the invention as defined by the appended claims and their equivalents.
    权利要求:
    Claims (29)
    [1]
    A multilayer film or sheet comprising a first layer of polyethylene of a first density and a second layer of polyethylene of a second density, wherein the first and second densities are different, and at least one core or inner layer of a polyethylene-based layer with oxygen barrier properties.
    [2]
    The film or sheet of claim 1, wherein the core or inner layer has a thickness in the range from 5 µm to 20 µm.
    [3]
    The film or sheet according to claim 2, wherein the core or inner layer has a thickness of about 10 µm or 15 µm.
    [4]
    Film or sheet according to any of the preceding claims, wherein the first layer is an outer layer and the second layer is an inner layer.
    [5]
    Film or sheet according to any of the preceding claims, wherein the first density is higher than the second density.
    [6]
    6. The film or sheet according to any one of the preceding claims, wherein the first density in the range of 0.929 g / cm 3 to 0.965 g / cm 3 is situated.
    [7]
    The film or sheet of claim 6, wherein the first density is about 0.931 g / cm 3 .
    [8]
    Film or sheet according to any of the preceding claims, wherein the second density is in the range from 0.80 g / cm 3 to 0.90 g / cm 3 .
    [9]
    The film or sheet of claim 8, wherein the second density is about 0.88 g / cm 3 .
    [10]
    Film or sheet according to any of the preceding claims, wherein the density of the core or an inner layer is in the range of 1.0 g / cm 3 to 1.5 g / cm 3 .
    BE2019 / 0018
    [11]
    The film or sheet of claim 10, wherein the density of the core or inner layer is about 1.1 g / cm 3 .
    [12]
    Foil or sheet according to any of the preceding claims, wherein the first layer has a thickness in the range from 5 μm to 25 μm.
    [13]
    The film or sheet of claim 12, wherein the first layer has a thickness of about 16 µm.
    [14]
    The film or sheet of claim 13, wherein the second layer has a thickness in the range from 5 µm to 30 µm.
    [15]
    The foil or sheet of claim 14, wherein the second layer has a thickness of about 13 µm.
    [16]
    Foil according to any of the preceding claims, wherein the thickness of the foil is in the range from 30 µm to 200 µm.
    [17]
    Foil or sheet according to any one of the preceding claims, wherein the thickness of the sheet is in the range from 200 μm to 1000 μm.
    [18]
    The film or sheet according to any of the preceding claims, wherein the first layer has a thickness in the range from 20 µm to 200 µm.
    [19]
    Film or sheet according to any one of the preceding claims, wherein the second layer has a thickness in the range from 20 µm to 200 µm.
    [20]
    20. The film or sheet according to any one of the preceding claims, wherein the first density is in the range of from 0.900 g / cm 3 to 0.965 g / cm 3 is situated.
    [21]
    Film or sheet according to any of the preceding claims, wherein the or at least one of the barrier layers has a thickness in the range from 5 µm to 50 µm.
    [22]
    A three-layer coextruded polyethylene film or sheet comprising an inner layer of polyethylene of a first density and an outer layer of polyethylene of a second density, the first and second densities
    BE2019 / 0018 are different, and a polyethylene core layer formed between the inner and outer layers, the core layer having oxygen barrier properties.
    [23]
    The film or sheet of claim 22, wherein the barrier material is used only in the core or an inner layer.
    [24]
    A five-layer foil or sheet comprising: an inner layer of polyethylene of a first density; a polyethylene-based barrier layer; a central layer of polyethylene; a polyethylene-based oxygen barrier layer; and an outer layer of second density polyethylene, wherein the first and second densities are different.
    [25]
    Multilayer film or sheet comprising a first layer of polyethylene with higher heat resistance and a second layer of polyethylene with lower heat resistance, and a core or inner layer of polyethylene layer with oxygen barrier properties applied between the first and second layers.
    [26]
    The film of claim 25, wherein the first layer is applied as an overlay and the second layer is applied as an inner layer so that when they are sealed together, two opposing second layers seal against each other.
    [27]
    A bag, a flow wrapping pack, tray or lid formed from a foil or sheet according to any one of the preceding claims.
    [28]
    An upright bag, flow wrapping suit or lid that is easily recyclable in the polyethylene recycling stream, the pack being formed from a film according to any one of claims 1 to 26, and formed by sealing opposing panels of film, with respective inner layers sealed together.
    [29]
    29. Tray formed from a sheet containing an inner layer that is partially or completely composed of a polyethylene based organic oxygen barrier mixture that is easily recyclable in the polyethylene recycling stream, the first layer being heat sealable with a suitable cover film.
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    同族专利:
    公开号 | 公开日
    GB201810853D0|2018-08-15|
    BE1026531A1|2020-03-06|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    WO2015157876A1|2014-04-14|2015-10-22|Exxonmobil Asia Pacific Research & Development Co., Ltd.|Multilayer films and methods of making the same|
    WO2017127808A1|2016-01-21|2017-07-27|Jindal Films Americas Llc|Bi-oriented, cavitated, linear, low-density film with good sealing properties|
    EP3293002A1|2016-09-09|2018-03-14|Dow Global Technologies LLC|Multilayer films and laminates and packages formed from same|
    法律状态:
    2020-04-22| FG| Patent granted|Effective date: 20200311 |
    2021-10-27| MM| Lapsed because of non-payment of the annual fee|Effective date: 20210228 |
    优先权:
    申请号 | 申请日 | 专利标题
    GBGB1810853.0A|GB201810853D0|2018-07-02|2018-07-02|Multilayer film|
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