Liquid food packaging material, system and method for applying an opening to this packaging material

Abstract

A laminated packaging material for liquid food products, comprising a paperboard having a color other than white or a film disposed thereon, and a pre-laminated hole (3) disposed in an opening section of the paperboard, wherein a first contrast area (4) is disposed adjacent to the pre-laminated hole (3) and is printed with a first color selected to achieve high contrast between the first color and the pre-laminated hole (3). [Selected figure] Figure 1

Description

Technical Field

[0001] The present invention relates to a liquid food packaging material that is a color other than white or includes a film. Specifically, it relates to a liquid food packaging material for folding into a container having an opening. More specifically, it relates to the positioning of an opening based on improving the contrast of a liquid food packaging material.

Background Art

[0002] Today, carton-based packaging materials for liquid food containers are usually white, and then various graphics such as patterns, logos or the like are printed on them. As is known today, many pourable foods such as fruit juice, UHT (ultra-high temperature treated) milk, wine, tomato sauce, and others are sold in containers made of laminated packaging materials.

[0003] The packaging material has a multilayer structure including a base layer for rigidity and strength, and the base layer may comprise a layer of fibrous material such as paper or cardboard, or a layer of mineral-filled polymer material, and both sides are covered with layers of a thermoplastic material such as polyethylene film. In the case of aseptic packaging for long-term storage products such as UHT milk, the packaging material includes a layer of an oxygen barrier material such as aluminum foil, and is then covered with another layer of a thermoplastic material that finally forms the inner surface of the container in contact with the food. These types of containers are manufactured on fully automatic packaging machines operating at high speed by forming and sealing a packaging container filled with a liquid food.

[0004] Once formed or while being formed, the container may be subjected to further processing such as the application of an opening device that enables pouring out the product.

[0005] Currently, the most commonly commercially available opening device includes a frame portion that defines a pouring spout and is attached around a removable or perforable portion of the upper wall of the packaging container, and a cap that is hinged or screwed to the frame portion and is removable to open the container.

[0006] In particular, each opening device can be applied to corresponding so-called pre-laminated holes or laminated pre-cut holes in packaging materials, i.e., pre-cut holes in which holes are formed in the cardboard and an additional printed substrate material layer on the cardboard, and the holes are covered with other laminate layers including a gas barrier material layer.

[0007] A system for applying an opening device to a container is known, in which the container is advanced by a conveying unit, for example, a conveyor belt that defines a substantially horizontal surface and supports the container. The system further includes an application device having an application element that receives the opening device from a transfer unit, advances the opening device through an adhesive unit (in which case a layer of adhesive is distributed to the frame portion of the opening device), and then applies the opening device to the wall of the container, particularly the top wall.

[0008] The system further includes sensors, such as a camera, that detect the location of the container, particularly the pre-stacked holes, and generate signals to control the application element to position and install the opening device in the container at the location of the pre-stacked holes.

[0009] A drawback of today's systems is that the opening device may be improperly applied to the container. In particular, if the container is not aligned with the application element—for example, if the container is tilted on the conveyor belt—the opening device may not be positioned correctly, for example, not centered relative to the pre-stacked holes. In this way, the final container may contain defects. This can be done in an automated manner, for example by using a camera-based system, but some systems still have problems with detecting the pre-stacked holes so that the opening can be applied to the container. [Overview of the Initiative] [Problems that the invention aims to solve]

[0010] The object of the present invention is to overcome at least partially one or more of the limitations of the prior art identified above. In particular, the object is to overcome the problem of detecting pre-laminated holes, especially on packaging materials including packaging materials or films of colors other than white. [Means for solving the problem]

[0011] According to a first embodiment, a laminated packaging material for liquid food comprises a cardboard on which a color other than white or a film is arranged, and pre-laminated holes arranged in the opening section of the cardboard, wherein a first contrast area is arranged adjacent to the pre-laminated holes and is printed with a first color selected to achieve a high contrast between the first color and the pre-laminated holes.

[0012] According to a second embodiment, a system for manufacturing packaging material for liquid food comprises a printing unit for printing a first contrast region adjacent to pre-laminated holes on a cardboard on which a color other than white or a film is arranged, and printing with a first color selected such that a high contrast between the first color and the pre-laminated holes is achieved; and a drying unit for drying the liquid food packaging material including the first contrast region.

[0013] According to a third embodiment, a method for manufacturing packaging material for liquid food includes the steps of supplying a cardboard on which a color other than white or a film is arranged thereon, and on which pre-laminated holes are arranged in the opening section; and printing a first contrast region adjacent to the pre-laminated holes, which is printed in a first color selected such that a high contrast between the first color and the pre-laminated holes is achieved.

[0014] According to the fourth aspect, the liquid food container is The device comprises a cardboard on which a color other than white or a film is placed, and pre-laminated holes located in the opening section of the cardboard, wherein a first contrast region is located adjacent to the pre-laminated holes and is printed with a first color selected to achieve a high contrast between the first color and the pre-laminated holes.

[0015] According to a fifth aspect, a method for manufacturing a liquid food container includes the steps of providing a packaging material for liquid food and folding the packaging material into a container that is at least partially complete.

[0016] Further examples of the present invention are defined in the dependent claims, where the features of the second, third, fourth, and fifth aspects of the present disclosure are the same as those of the first aspect with necessary modifications.

[0017] The cardboard may have a film placed on it, which is a holographic film or a metallized film.

[0018] The first contrast region may at least partially surround a pre-stacked hole, and therefore, in one embodiment, may surround a pre-stacked hole.

[0019] In one embodiment, the first contrast region may have an area that is at least 5%, 10%, 20%, or 35% larger than the pre-layered holes.

[0020] The laminated packaging material further includes a plurality of opening identification marks that are placed in pre-laminated holes and printed in a second color, and therefore a method for manufacturing the laminated packaging material may further include the step of printing such a plurality of opening identification marks.

[0021] The laminated packaging material may further include a second contrast region in the plurality of opening identification marks, and the second contrast region is printed in a third color selected such that a high contrast is achieved between the second color of the identification mark and the third color of the second contrast region. Accordingly, the method of manufacturing the laminated packaging material may further include the step of printing a second contrast region in the plurality of opening identification marks, and the second contrast region is printed in a third color selected such that a high contrast is achieved between the second color of the identification mark and the third color of the second contrast region.

[0022] The identification marks may have different shapes from each other, and accordingly the method may include printing the identification marks in different shapes from each other.

[0023] The laminated packaging material may further include a two-dimensional code and a third contrast region disposed on the two-dimensional code, and the third contrast region is selected such that a high contrast is achieved between the two-dimensional code and the third contrast region.

[0024] Some examples of the present disclosure provide a packaging material including a film that is a holographic film or a metallized film.

[0025] Some examples of the present disclosure provide a high contrast between the first color and the holes laminated in advance.

[0026] Some examples of the present disclosure provide the first color, and the color is selected far from the color of the holes laminated in advance.

[0027] Some examples of the present disclosure provide a color having a hue and / or lightness selected such that a high contrast is achieved between the color and the holes laminated in advance.

[0028] Some examples of the present disclosure provide an opening applicator system.

[0029] Some examples of this disclosure provide a visual system for detecting pre-stacked holes.

[0030] Some examples of the present disclosure provide simpler and / or less expensive visual systems for detecting pre-stacked holes.

[0031] Some examples of this disclosure provide a first color selected from the CMYK or NCS color space.

[0032] Some examples of this disclosure provide customizable packaging materials with various types of optical effects that produce attractive results.

[0033] Some examples of this disclosure provide a way to easily detect the edges of pre-laminated holes in packaging materials.

[0034] Some examples of this disclosure provide a reduction in the optical resolution of a visual system.

[0035] Some examples of this disclosure provide identification marks for aligning an opening device on and with respect to packaging material.

[0036] Some examples of the present disclosure provide second and third colors selected from the color pairs of black-white, red-green, blue-orange, red-cyan, green-magenta, blue-yellow, yellow-purple, blue-orange, or the reverse pair.

[0037] Some examples of this disclosure provide second and third colors selected from the CMYK or NCS color space.

[0038] Some examples of this disclosure provide a reduction in optical phenomena between an identification mark and a second contrast region.

[0039] Some examples of this disclosure provide shapes that may exhibit the same optical phenomena.

[0040] Some examples in this disclosure provide a high probability that a visual system will recognize an identification mark.

[0041] Some examples in this disclosure provide more unique combinations for visual systems.

[0042] Some examples of this disclosure provide QR codes.

[0043] The present invention has disclosed various examples of packaging materials including pre-laminated perforations. It should also be understood that the present invention covers liquid food packaging materials without pre-laminated perforations, or that pre-laminated perforations may be performed after the packaging material has been contrast-enhanced, as disclosed herein. Such packaging materials may utilize different types of openings that can penetrate the packaging material, once the correct position is determined based on identification marks and / or contrast areas. It has also been disclosed herein that a film may be placed on cardboard, and it should be understood that this is not exclusively the case, and other intermediate layers such as adhesives, plastic compositions, etc., may also be present between the cardboard and the film. The film may be a polymer film and may be a printable film placed on one side of the cardboard, or a film laminated on the opposite side of the cardboard that at least partially covers the packaging material, such as a barrier film or a heat-sealable film. Furthermore, it should be understood that cardboard having a color other than white may be colored itself, or the cardboard may be post-processed, for example, by completely printing the cardboard in a certain color, or by treating it in another way to have a color other than white.

[0044] The term "lamination" should be understood to include at least a cardboard base and any further layers, such as plastic layers, that are substantially bonded to the cardboard.

[0045] Further objects, features, embodiments, and advantages of the present invention will become apparent from the following detailed description and drawings.

[0046] Next, embodiments of the present invention will be described, for example, with reference to the attached schematic diagram. [Brief explanation of the drawing]

[0047] [Figure 1] This is a front view of a liquid food packaging material including pre-layered holes and a first contrast region. [Figure 2] This is a front view of a liquid food packaging material including pre-layered holes, identification marks, and first and second contrast regions. [Figure 3a] This is a front view of a liquid food packaging material, including an identification mark and a second contrast region having a different shape from the identification mark. [Figure 3b] This is a front view of a liquid food packaging material including pre-layered holes and identification marks, where the first and second contrast regions are the same. [Figure 3c] This is a front view of packaging materials, including identification marks of different shapes. [Figure 4] This is a schematic side view of a system for manufacturing packaging material for liquid foods, including pre-layered holes and a first contrast region. [Figure 5] This is a flowchart showing the method for manufacturing liquid food packaging materials. [Figure 6] This is a perspective view of a container made from packaging material that includes a color other than white or a film, pre-laminated holes, and a first contrast region. [Figure 7] This is a flowchart showing the method for manufacturing liquid food containers. [Modes for carrying out the invention]

[0048] Referring to Figure 1, an example of a laminated packaging material 1 for liquid food is shown. The packaging material 1 includes a cardboard sheet with a color other than white 2 or a film 2 placed on top thereof, and a pre-laminated hole 3 located in the opening section of the cardboard sheet. The packaging material 1 also includes a first contrast region 4 located adjacent to the pre-laminated hole 3 and printed with a first color, the first color being selected to achieve a high contrast between the first color and the pre-laminated hole 3. The high contrast between the two is achieved by printing the contrast region 4 with a first color selected to be far removed in hue and / or lightness from the color of the pre-laminated hole 3. This high contrast can be used, for example, in conjunction with an opening applicator system, which may use a visual system to detect the pre-laminated hole 3 and its position on the packaging laminate 1 so that the opening can be applied to cover the pre-laminated hole 3 in a precise and accurate manner. This also means that the higher the contrast achieved between the first color and the pre-laminated hole 3, the simpler and less expensive the visual system can be. For example, the visual system of the aperture applicator can use low light, inexpensive optics, and inexpensive sensors to detect the pre-stacked holes 3. In one example, the first color is selected as white, but other colors are also possible, as long as high contrast is achieved to detect the pre-stacked holes 3. In a further example, the first color is selected as black. In one example, the first contrast region has a width of at least 0.3 mm outside the pre-stacked holes 3. In one example, the first color is selected from the CMYK or NCS color space. In one example, the pre-stacked holes 3 are holes 3 that do not contain the stack.

[0049] In one example, film 2 is a holographic film or a metallized film. By having a holographic or metallized film as film 2 on the packaging material 1, the packaging material 1 can be customized with various types of optical effects that give an attractive effect to the final container.

[0050] In the example shown in Figure 2, the first contrast region 4 surrounds at least partially the pre-layered holes 3. By the first contrast region 4 surrounding at least the pre-layered holes 3, it becomes easier to detect the edges of the packaging material 1 in the pre-layered holes 3 and thus apply an opening to them. The more the first contrast region 4 surrounds the pre-layered holes 3, the easier it becomes to detect the edges along the entire packaging material 1 in the pre-layered holes 3 and thus apply an opening to the desired location. For example, in the example shown in Figure 2, the first contrast region 4 surrounds the pre-layered holes 3.

[0051] For example, in the examples shown in Figures 1-3c, the first contrast region 4 has an area that is at least 5%, 10%, 20%, or 35% larger than the pre-layered holes 3. By making the contrast region 5 larger than the identification mark 4, the optical resolution of the visual system needs to be lowered in order to optically resolve the identification mark 4 from the non-white colored cardboard 2 or coated background 2. In one example, the area of ​​the contrast region 5 is selected based on the optimal optical resolution of the visual system. In other examples, the area of ​​the contrast region 5 is greater than 100% of the identification mark 4 or less than 50% of it.

[0052] For example, in the example shown in Figure 2, the packaging material 1 further includes a plurality of opening identification marks 5 positioned adjacent to the pre-laid holes 3 and printed in a second color. Having these identification marks 5 makes it possible to locate the pre-laid holes 3, as well as to align the openings on and with respect to the packaging material 1.

[0053] For example, in the example shown in Figure 2, the packaging material 1 further includes a second contrast area 6 printed in a third color at the locations of several opening identification marks 5, the third color being selected to achieve a high contrast between the second color of the identification marks 5 and the third color of the second contrast area 6. In one example, the second and third colors are selected from color pairs such as black-white, red-green, blue-orange, red-cyan, green-magenta, blue-yellow, yellow-purple, blue-orange, or vice versa. In one example, the second and third colors are selected from the CMYK or NCS color space. The second and third colors are selected to obtain the greatest possible contrast, as well as the difference between the first color of the first contrast area 4 and the pre-laminated holes 3, and so that an opening applicator with a visual system can easily identify these identifiers for applying the opening to the packaging material 1. In one example, the identification marks 5 have a diameter of at least 0.8 mm.

[0054] For example, in the example shown in Figure 2, the second contrast region 6 is a shape complementary to the shape of the identification mark 5, such as a circle, square, rectangle, or ellipse. By making the second contrast region 6 a shape complementary to the identification mark 5 or another common shape, it is possible to reduce the optical phenomena between the identification mark 5 and the second contrast region 6, because these shapes may have the same potential optical phenomena.

[0055] For example, in the example shown in Figure 3a, a different shape is used for the second contrast region 6 compared to the shape of the identification mark 5. In one example, the first contrast region 4 and the second contrast region 6 are separated from each other. For example, in the example shown in Figure 3b, the first contrast region 4 and the second contrast region 6 are the same.

[0056] For example, in the example shown in Figure 3c, the identification marks 4 have different shapes. Having identification marks 4 with different shapes increases the likelihood that the visual system will recognize the identification marks 4 and not consider them as noise; in other words, it creates more unique combinations for the visual system to search for.

[0057] In one example, referring to Figure 4, a system 50 for manufacturing liquid food packaging material 1 is shown. The system 50 comprises a printing unit 51 for printing on a cardboard having a film 2 having a color other than white or having a film placed thereon. The printing unit 51 is adapted to print a first contrast area 4 adjacent to pre-laminated holes 3 and to print in a first color selected to achieve a high contrast between the first color and the pre-laminated holes 3. Furthermore, the system 50 comprises a drying unit 52 for drying the liquid food packaging material 1 having the first contrast area 4. In one example, the printing unit 51 is an inkjet printer, a flexographic printer, an offset printer, or a web gravure printer. In one example, the drying unit 52 is an infrared dryer, a hot air dryer, a contact dryer, or another common dryer.

[0058] In one example, referring to Figure 5, a method 100 for producing packaging material 1 for liquid food is shown. Method 100 includes the steps of supplying a cardboard 2 having a color other than white or a film 2 placed on a cardboard and placing pre-laminated holes 3 in the opening section of the laminated cardboard. Method 100 further includes printing a first contrast area 4 adjacent to the pre-laminated holes 3 120 and printing it with a first color selected such that a high contrast between the first color and the pre-laminated holes 3 is achieved.

[0059] In one example, the supply of cardboard with film is cardboard with a holographic film or a metallized film. In one example, the first contrast area 4 is printed so as to at least partially surround the pre-laminated holes 3. In another example, the first contrast area 4 is printed so as to surround the pre-laminated holes 3. In one example, the first contrast area 4 is printed over an area that is at least 5%, 10%, 20%, or 35% larger than the pre-laminated holes 3.

[0060] In one example, method 100 further includes the step of printing a plurality of opening identification marks 5 that are placed in pre-laminated holes 3 and printed in a second color. In a further example, method 100 further includes the step of printing a second contrast area 6 on the plurality of opening identification marks 5, and printing in a third color selected such that a high contrast is achieved between the second color of the identification marks 5 and the third color of the second contrast area 6. In one example, the identification marks 5 are printed in different shapes from each other.

[0061] In an example referring to Figure 6, a liquid food container 10 is shown, comprising a cardboard having a film 2 having a color other than white or having a film 2 placed thereon. The liquid food container 10 also comprises pre-laminated holes 3 located at the openings of the cardboard. The liquid food container 10 also comprises a first contrast area 4 located adjacent to the pre-laminated holes 3 and printed with a first color. The first color is selected so as to achieve a high contrast between the first color and the pre-laminated holes 3. Since the packaging material 1 is used to form the liquid food container 10, the same effects and advantages described above with respect to the packaging material 1 also apply to the liquid food container 10 described herein.

[0062] In an example referring to Figure 7, a method 200 for manufacturing a liquid food container 10 is shown. This method includes the steps of providing a packaging material 1 for liquid food and folding the packaging material 1 into a container 10 that is at least partially complete.

[0063] In one example, a method for manufacturing a liquid food container 10 further includes the steps of filling a container 10 that is at least partially folded, sealing a container 10 that is at least partially folded, and applying an opening device to the filled and sealed container 10.

[0064] The application of the opening device may also be performed before the step 220 of at least partially folding the container 10, so that the container 10 is filled and sealed after the application of the opening device. Alternatively, the opening device may be applied after the step 220 of at least partially folding the container 10, but before the container 10 is filled with liquid and further sealed. In one example, the opening device is applied after the container 10 has been folded and filled, but before the container 10 is sealed. In one example, an opening applicator system is used to apply an opening to the packaging material 1 described above. The applicator system comprises a visual system, a conveyor for transporting the container 10, and an opening applicator. The visual system detects pre-stacked holes 3 with the help of a first contrast area 4, and the opening applicator then applies an opening to the container 10 at the position of the pre-stacked holes 3 detected by the visual system.

[0065] In one example, a QR code, barcode, or other 2D or 1D code is printed on the packaging material 1. In addition to, or instead of, the first contrast area 4 and the second contrast area 6 described above, a third contrast area may be printed on the QR code.

[0066] In further examples, laminated packaging materials for liquid foods include cardboard with a color other than white or a film placed on top thereof. Laminated packaging materials also include a two-dimensional code, such as a QR code, and a third contrast area placed on the two-dimensional code. Thus, the difference compared to packaging material 1 is that there may or may not be pre-laminated holes 3 for an opening device, i.e., holes that are pre-cut in the base layer and then laminated with further layers. All other functions and effects are the same as packaging material 1.

[0067] The third contrast region is selected, as described above with respect to packaging material 1, so as to achieve a high contrast between the QR code color and the third contrast region. Printing of the third contrast region can be done by an inkjet printer, flexographic printer, offset printer, or web gravure printer, as in the above example related to packaging material 1.

[0068] Although various embodiments of the present invention have been described and shown above, the present invention is not limited thereto and may be embodied in other ways within the scope of the subject matter defined in the following claims.

Claims

1. A laminated packaging material (1) for liquid food, Cardboard that has a color other than white, The cardboard includes a pre-cut hole (3) located in the opening section, The pre-cut holes (3) include through holes provided in the cardboard, and a laminate layer is provided on the cardboard so as to cover the through holes. A laminated packaging material (1) for liquid food, wherein a first contrast region (4) at least partially surrounds the pre-cut holes and is printed in a first color having a hue and / or lightness selected to detect the position of the pre-cut holes, thereby achieving a high contrast with the pre-cut holes.

2. A laminated packaging material (1) for liquid food, A cardboard on which a holographic film or a metallized film is placed, The cardboard includes a pre-cut hole (3) located in the opening section, The pre-cut holes include through holes provided in the cardboard, and a laminate layer is provided on the cardboard so as to cover the through holes. A laminated packaging material (1) for liquid food, wherein a first contrast region (4) at least partially surrounds the pre-cut holes and is printed in a first color having a hue and / or lightness selected to detect the position of the pre-cut holes, thereby achieving a high contrast with the pre-cut holes.

3. The first contrast region surrounds the pre-cut hole, Laminated packaging material for liquid food according to claim 1 or 2.

4. The first contrast region has an area that is at least 5% larger than the pre-cut hole. The laminated packaging material for liquid food according to claim 3.

5. The device further comprises a plurality of opening identification marks (5) arranged adjacent to the pre-cut holes and printed in a second color. A laminated packaging material for liquid food according to any one of claims 1 to 4.

6. The plurality of opening identification marks (5) are further provided with a second contrast region (6), the second contrast region (6) being located in a different region from the first contrast region (4), and printed with the third color having a hue and / or lightness selected to achieve a high contrast between the second color of the identification mark and the third color of the second contrast region. The laminated packaging material for liquid food according to claim 5.

7. The aforementioned identification marks have different shapes from each other. Laminated packaging material for liquid food according to claim 5 or 6.

8. 2D code and, The two-dimensional code further comprises a third contrast region, the third contrast region having a hue and / or lightness selected such that a high contrast is achieved between the two-dimensional code and the third contrast region. A laminated packaging material for liquid food according to any one of claims 1 to 7.

9. A method (100) for manufacturing a laminated packaging material for liquid food, - A step (110) of supplying cardboard having a color other than white, in which pre-cut holes (3) are arranged in the opening section thereof, The pre-cut holes (3) include through holes provided in the cardboard, and a laminate layer is provided on the cardboard so as to cover the through holes. A method (100) comprising the step (120) of printing a first contrast region (4) which at least partially surrounds the pre-cut holes, and is printed in a first color having a hue and / or lightness selected to detect the position of the pre-cut holes, such that a high contrast is achieved between the first contrast region (4) and the pre-cut holes.

10. A method (100) for manufacturing a laminated packaging material for liquid food, The steps (110) include supplying a cardboard on which a holographic film or a metallized film is disposed, and on which pre-cut holes (3) are disposed in the opening section of the cardboard, The pre-cut holes include through holes provided in the cardboard, and a laminate layer is provided on the cardboard so as to cover the through holes. A method (100) comprising the step (120) of printing a first contrast region (4) which at least partially surrounds the pre-cut holes, and is printed in a first color having a hue and / or lightness selected to detect the position of the pre-cut holes, such that a high contrast is achieved between the first contrast region (4) and the pre-cut holes.

11. The first contrast region is printed such that it at least partially surrounds the pre-cut hole. A method for producing a laminated packaging material for liquid food according to claim 9 or 10.

12. The first contrast region is printed so as to surround the pre-cut holes. A method for producing a laminated packaging material for liquid food according to any one of claims 9 to 11.

13. The first contrast region is printed in an area that is at least 5% larger than the pre-cut holes. A method for producing a laminated packaging material for liquid food according to claim 12.

14. The step further includes printing a plurality of opening identification marks (5) that are positioned adjacent to the pre-cut holes and printed in a second color, A method for producing a laminated packaging material for liquid food according to any one of claims 9 to 13.

15. The method further includes printing a second contrast region (6), which is located in a region different from the first contrast region (4), on the plurality of aperture identification marks (5) with a third color having a hue and / or lightness selected to achieve a high contrast between the second color of the identification marks and the third color of the second contrast region. A method for producing a laminated packaging material for liquid food according to claim 14.

16. The aforementioned identification marks are printed in shapes that are different from each other. A method for producing a laminated packaging material for liquid food according to claim 14 or 15.

17. A liquid food container (10) comprising a laminated packaging material for liquid food, Cardboard that has a color other than white, The cardboard includes a pre-cut hole (3) located in the opening section, The pre-cut holes (3) include through holes provided in the cardboard, and a laminate layer is provided on the cardboard so as to cover the through holes. A liquid food container (10) in which a first contrast region (4) at least partially surrounds the pre-cut holes and is printed with a first color having a hue and / or lightness selected to detect the position of the pre-cut holes, thereby achieving a high contrast with the pre-cut holes.

18. A liquid food container (10) comprising a laminated packaging material for liquid food, A cardboard on which a holographic film or a metallized film is placed, The cardboard includes a pre-cut hole (3) located in the opening section, The pre-cut holes include through holes provided in the cardboard, and a laminate layer is provided on the cardboard so as to cover the through holes. A liquid food container (10) in which a first contrast region (4) at least partially surrounds the pre-cut holes and is printed with a first color having a hue and / or lightness selected to detect the position of the pre-cut holes, thereby achieving a high contrast with the pre-cut holes.

19. The first contrast region surrounds the pre-cut hole. A liquid food container according to claim 17 or 18.

20. The first contrast region has an area that is at least 5% larger than the pre-cut hole. A liquid food container according to any one of claims 17 to 19.

21. The device further comprises a plurality of opening identification marks (5) arranged adjacent to the pre-cut holes and printed in a second color. A liquid food container according to any one of claims 17 to 20.

22. A second contrast region (6) is provided in a region different from the first contrast region (4) in the plurality of aperture identification marks (5), The invention further comprises a second contrast region (6) printed with the third color having a hue and / or lightness selected to achieve a high contrast between the second color of the identification mark and the third color of the second contrast region. The liquid food container according to claim 21.

23. The aforementioned identification marks have different shapes from each other. A liquid food container according to claim 21 or 22.

24. A method for manufacturing liquid food containers (200), The step (210) of providing a packaging material for liquid food according to any one of claims 1 to 8, The steps include folding the packaging material into a container that is at least partially complete (220), A method including (200).

25. Filling the aforementioned container, at least partially folded, To seal the container that is at least partially folded, and Applying an opening device to the filled and sealed container, A method for manufacturing a liquid food container according to claim 24, further comprising:

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