The packaging material of the multilayer type and packaging for light-sensitive products
The invention relates to a packaging material and made of it packages such as bottles for light-sensitive products. The packaging material 10 includes at least one layer 11 of plastic, which contains mineral particles 11b, uniformly distributed in the mass of the layer, and to improve svetasreni properties contains particles 11S coal soot. Mineral particles contained in the layer of plastic in an amount of from 3 to 80% by weight of the layer, and the carbon black contained in the specified layer 11 in the amount of from 0.04 to 1% by weight of the mass 11a. The material 10 is preferably a three-layer, with a layer of mineral filler 11 containing coal soot, is located between the outer, surrounding layers 12 and 13 of plastic, which is preferably the same plastic as the plastic intermediate layer 11. To hide the intermediate layer 11 containing coal soot, at least one, and preferably both outer plastic layer may contain a white pigment or other white dye, preferably titanium dioxide (TiO2). The bottle is made from the packaging material 10 known combined method of extrusion and blow molding using the internal material and packaging from it with less consumption of coal soot to improve svetasreni properties and a white pigment or other white dye to make the packaging material attractive for the consumer white. 2 s and 5 C.p. f-crystals, 1 Il. The invention relates to a packaging material containing permanently United with each other the layers of plastic material, of which at least one layer, to improve svetasreni properties, contains dispersed particles of coal soot. In addition, the present invention relates to a package for light-sensitive products made from this cloth.The prior art and packaging materials, and packaging of the above type. For example, sales are bottles made combined method of extrusion and blow molding of such a three-layer material. In these bottles, the material has an intermediate layer of high density polyethylene mixed with particles of coal soot and outer layers of high density polyethylene on both sides of the intermediate layer.Bottles, known from the prior art, are used for transporting the so-called INT-milk, i.e. milk subjected to prolong the storage time of the heat treatment at a temperature of approximately 135-150oWith for about 1-2 seconds in order to reduce or exclude the microflora of milk.As Molo is built in the ultraviolet range of wavelengths, it is important that the milk was stored in the package so that it wouldn't be exposed to ultraviolet radiation from the environment.Layers of plastic, consisting entirely of high density polyethylene, are almost entirely devoid of svetasreni properties, in particular UV light, and therefore, these layers do not provide protection from light, is necessary to ensure that the milk can be stored during the period of the desired duration. Therefore, to ensure long shelf-life milk in the bottles of the prior art, in the intermediate layer of the packaging material is injected particles of a light-absorbing substance, usually coal soot, which effectively absorbs ambient light and thereby prevent its penetration through the material of the wall of the bottle to packaged milk.However, the presence of particles of coal soot in large quantities, used in packaging material, known from the prior art, leads to the formation of excessively blackened intermediate layer, which is clearly visible through the outer layers of bottles of high-density polyethylene, which gives the bottle an unattractive appearance. To hide such ZM amount of the white pigment of titanium dioxide (Tio2to hide beneath them black intermediate layer and, thus, make the bottle more attractive for the consumer white appearance.However, as mentioned above, a problem associated with a three-layer material known from the prior art, is that to achieve the required svetasreni properties require a relatively large number zachernaya particles of coal soot in the intermediate layer, at the same time also need correspondingly large amount of white pigment (TiO2) in the outer layer to hide unwanted, often caused by these particles. This entails in vain, but the inevitable increase in material consumption and, therefore, increase the cost of manufacture of this material.Another disadvantage associated with the excessive number of particles of coal soot, is that waste arising in the process of making bottles cannot be returned to the process because of their often strong, and we have to whiten them by adding a white pigment (TiO2or other white coloring substance, so that they can be sent to the process for reuse. Such processing VL is e-waste in the process and reuse disadvantageous.So the task that forms the basis of the present invention, therefore, is the creation of the packaging material of the above type in a way that does not require large quantities of coal soot to improve svetasreni properties, nor large amounts of white pigment (TiO2or other white dye to make the packaging material white appearance.According to the invention this problem is solved by a packaging material having the characteristics set out in paragraph 1 of the attached claims. Improvements and preferred variants of the embodiment of the present invention have the additional features shown in the dependent claims.The present invention is the unexpected discovery that a film or thin sheet of plastic with a mineral filler in the case of adding a light-absorbing particles of coal soot synergistically improves their svetasreni properties. Experiments have confirmed that svetasreni properties inherent in the plastic film with a mineral filler and of themselves insufficient to prevent transmission of ultraviolet l is d', meets only a small part often on the technology of the prior art. Visually, this can be represented in such a way that the intermediate layer in the packaging material according to the invention will be painted only in grey color, while the intermediate layer in the packaging material of the prior art is completely black.The mechanism of this synergistic svetozarevo effect, which is unexpectedly achieved with the use of the present invention is not clear, but may be explained by the fact that reflective mineral particles lengthen the path of light rays incident on the intermediate layer due to their reflection from mineral particles and thus increase the likelihood that the light beam will collide with the light-absorbing particle and absorbed it. However, this explanation should not be seen as only possible, but as a working hypothesis for explaining the present invention.The material of the intermediate layer with mineral filler contains plastic compound and particles embedded in the compound and consisting, on the one hand, from a reflective material, and, on the other hand, from a light absorbing material.In practice, the base material of the compound can comprising the polyolefin plastic, already used in the packaging type bottles.Examples of such polyolefin plastics are polyethylene, such as high density polyethylene (HDPE), and polypropylene (PP) type of homopolymer and copolymer, such as copolymer of ethylene and propylene with a melt index between 0.5 and 5 according to ASTM (2,16 kg; 230oC), which is already well known and established copolymer in the field of packaging.As reflective mineral filler in the intermediate layer can be any suitable particles such as montmorillonite, dolomite, calcium carbonate, chalk, talc, mica, clay and so on, but it is preferable to use particles of dolomite, which is readily available and, in addition, approved for use in food packaging.An example of a plastic compound with a mineral filler material for the intermediate layer of the packaging material according to the invention is the material described, for example, in EP 0353991, EP 0353498, EP 0494594, EP 04940595, EP 0512364, EP 94105439.7, EP 95926568.7 or EP 96935679.9. According to these descriptions plastic compound with a mineral filler preferably consists of a copolymer of ethylene and propylene with indexation in amounts of between 50 and 80% of the total weight of the compound with a mineral filler.As already mentioned, in the intermediate layer of the packaging material according to the invention as a light-absorbing material used particles of coal soot, which in very small amounts already give a synergistic effect in combination with the above-described plastic compound with a mineral filler. To achieve the desired svetasreni properties of these particles only in the amount of 0.04 to 1% of the total weight of the intermediate layer to effectively prevent the passage of light, especially ultraviolet, and the particles only slightly change color (secernate) of the intermediate layer.In one preferred embodiment, the packaging material according to the invention the intermediate layer thus consists of a polyolefin plastic compound containing 3-80% of the filler particles, such as montmorillonite, dolomite, caso3, talc, mica, clay, etc., and 0.04-1% light-absorbing particles of coal soot.In the packaging material according to the invention the outer plastic layer (s) may, but need not, consist of the same plastic compound, as in the intermediate layer. However, it is preferable to use the same plastic in all bloodworthy material, which use different plastics.Homogeneous material with the same plastic in all layers of the material can be easily manufactured by conventional extrusion using existing equipment and does not need any adhesives (glues) or other substances for permanent Association jointly extruded layers of material with each other.Below the present invention is described more with reference to the accompanying drawing, which shows a schematic view in cross section particularly preferred packaging material for packaging type bottles according to the present invention.Packaging material, indicated in the drawing in General position 10 has a three-layer structure consisting of an intermediate layer 11 and outer layers 12 and 13 on both sides of the intermediate layer 11.The intermediate layer 11 consists of a plastic compound 11a and essentially uniformly distributed therein particles 11b mineral filler (empty squares in the drawing) and particles 11S coal soot (black dots in the drawing), which are preferably randomly distributed in the compound 11a between mineral particles 11b.As mentioned earlier, compoun is e, but preferably of plastic polyolefin type.Mineral particles 11b in the intermediate layer 11 can also be of any suitable type, for example, it may be particles of montmorillonite, dolomite, calcium carbonate, talc, mica, wollastonite, clay, etc., but in the example shown they consist of dolomite, which is already used in the known packaging materials together with polyolefin plastic, as described above.The amount of mineral particles may vary within very wide limits, from about 3 to about 80% of the total weight of the compound. Preferably, the amount of chalk in the intermediate layer 11 made up approximately 65% of the total weight of the matrix. This is the preferred number provides good rigidity of the intermediate layer 11 and, thus, allows termostabilno and handy bottle of the packaging material 10 according to the invention.As mentioned earlier, the intermediate layer of plastic compound and mineral particles, distributed in the compound itself has certain svetasreni properties, which is clearly insufficient to prevent transmission of light, especially ultraviolet the time, from ultraviolet light.For the above purpose, the intermediate layer 11, thus, includes a light-absorbing particles 11c coal soot, which, together with the simultaneously present mineral particles 11b, create a synergistic increased barrier effect and which, even in very small amounts provide effective protection to prevent pass ultraviolet light through the intermediate layer 11.The number of coal soot in the intermediate layer 11 is normally in the range of 0.04-1% of the total weight of the intermediate layer and is large enough to achieve the above-mentioned synergistic effect, and at the same time small enough not too blacked out intermediate layer.Like the intermediate layer 11 and two outer layers 12, 13 on both sides of the intermediate layer 11 may be composed of any plastic used in the packaging. In addition, the outer layers 12 and 13 may contain mutually different substances, but preferably they contain compounds from the same plastic, which, more preferably, is the same plastic as the plastic intermediate layer 11. In the shown embodiment, two narasaki density copolymer of ethylene and propylene with a melt index between 0.5 and 5 according to ASTM (2,16 kg; 230oC).As the light-absorbing particles 11c coal soot in the intermediate layer 11 give it a certain gray tone, which can be visible through the two outer layers 12 and 13, it may be appropriate (and in some cases desirable) hide the intermediate layer 11, to the extent possible. To this end respectively enter the white pigment, at least one layer, which must form the outer surface of the packaging or bottle made from the packaging material 10. The white pigment preferably also be injected into the intermediate layer. Useful white pigment is titanium dioxide (TiO2).As the number of coal soot in the intermediate layer 11 is very small, and the intermediate layer 11 as a result of this will be only slightly blacked out to hide the intermediate layer 11, therefore, will be very small amounts of white pigment (TiO2) in one or both of the outer layers 12, 13. Acceptable amount of white pigment can vary by up to about 5% by weight, respectively, of the outer layer and the intermediate layer depending on an adequate supply of coal soot in the intermediate layer 11.From the above packing masab manufacturing is well known to specialists in this field and described, for example, in published patent application Sweden 9503537-4, relevant portions of which are incorporated in this description by reference. For further details concerning this method of manufacture, thus, we refer to the above-mentioned Swedish patent application.Bottles made from the packaging material 10 according to the invention using the above-described combined method of extrusion and blow molding can be applied successfully to various light-sensitive products, but as it turned out, they are particularly useful for milk, subjected to ultra-high-temperature INT-processing and which can be stored on a shelf for long periods of time, up to several weeks without deterioration due to exposure to light. Also, the bottles are lightweight, easy to handle and at the same time attractive to the consumer white appearance, despite the presence of coal soot in the packing material.Thus, from the preceding description it is evident that the present invention is very simple means reaches its goal, while allowing to produce respectively the packaging material and packaging with less on the p>Although the packaging material and made of it packaging type bottles described with particular reference to those shown in the drawing an embodiment, the present invention, however, is not limited to this option. As will be clear to the person skilled in the art, are possible and apparent various changes and modifications in the individual parts without departing from the substance of the invention defined in the attached claims.
Claims1. Packaging multilayer material comprising at least one layer (11) made of plastic, which is to improve svetasreni properties contains particles (11C), coal soot, and mineral particles (11b), essentially uniformly distributed throughout the mass (11a) of the specified at least one layer (11), characterized in that the said mineral particles contained in the specified at least one layer (11) in an amount of from 3 to 80% by weight of the layer, and the carbon black contained in the specified layer (11) in the amount of from 0.04 to 1% by weight weight (11a).2. The packing material under item 1, characterized in that the mass (11a) layer with mineral filler (11) containing coal soot consists of polyolefin plastic-type.3. polytelis (11), containing coal soot consists of high density polyethylene or copolymer of ethylene and propylene with a melt index between 0.5 and 5 according to ASTM (American society for testing and materials) (2,16 kg; 230C).4. The packaging material according to any preceding paragraph, wherein the layer of mineral filler (11) containing coal soot, surrounded by outer layers (12 and 13) of plastic on both sides of the layer (11), and these outer layers (12 and 13) is inseparably connected with this layer (11) without located between the binder or adhesive.5. The packing material under item 4, characterized in that the two outer layers (12 and 13) consist of the same plastic as the plastic intermediate layer (11).6. The packing material under item 4 or 5, characterized in that one of the two outer plastic layers (12 and 13) contains a white pigment or other white dye to hide the intermediate layer (11) containing coal soot, at least in one direction.7. Packing, preferably a bottle, for light-sensitive products, characterized in that it is made combined method of extrusion and blow molding of packaging material is
FIELD: laminated material for manufacture of packaging containers by folding and thermal sealing and packaging containers for liquid food products manufactured from said material.
SUBSTANCE: packaging material 10 has central layer 11 of paper or cardboard and layer 12 of polyolefin with mineral filler on one side of central layer. Layer 12 with mineral filler has thickness of from 30 micron to 100 micron and has mineral particles in an amount of from 40% to 70% by weight of layer 12 with mineral filler. Both sides of central layer are provided with water-impermeable coating of polyolefin.
EFFECT: increased rigidity and provision for manufacture of containers with improved capturing properties.
8 cl, 4 dwg
FIELD: manufacturing multi-layered films.
SUBSTANCE: film comprises base made of bi-axially oriented polypropylene film and polyolefin film. Before laminating, the polyolefin film is colored. The multi-layered film is oriented in transverse direction or longitudinal direction and transverse direction after laminating. The thickness of the multi-layered film ranges from 8 μm to 26 μm. The method of producing the multi-layered film is also presented.
EFFECT: expanded functional capabilities.
9 cl, 3 ex