Beverage or food packaging paper base material, and beverage or food packaging containers

Abstract

This invention provides a beverage or food packaging paper base material and beverage or food packaging container that maintain strength even when using recycled paper pulp, and have a good appearance. [Solution] A beverage or food packaging paper base material 10 comprising a multilayer paper having three or more paper layers 18, and a thermoplastic resin layer 20 on at least one surface of the multilayer paper, wherein the three or more paper layers 18 comprise an inner layer 12, an outer layer 14, and an intermediate layer 16, the recycled pulp content of the inner layer 12 and outer layer 14 is less than 10% by mass, each layer of the intermediate layer 16 contains softwood pulp and recycled pulp, the total recycled pulp content of the intermediate layer is greater than the total recycled pulp content of the inner layer and outer layer, and the geometric mean of the interlayer strength of each layer of the paper layers 18 is 55 N / m or more. Also, a beverage or food packaging container made using the beverage or food packaging paper base material 10.

Description

Technical Field

[0001] The present invention relates to a paper base material for beverage or food packaging, and a beverage or food packaging container, particularly a paper base material for beverage or food packaging using recycled pulp, and a beverage or food packaging container.

Background Art

[0002] Due to the increasing interest in environmental and resource issues in recent years, disposability, incinerability, recyclability, etc. are required for containers and packaging materials. From these viewpoints, even for paper cups, etc., studies have been conducted on blending waste paper for the purpose of improving the recycling rate.

[0003] For example, the following Patent Document 1 describes that waste paper pulp can be used for the pulp which is the main component of the paper base material used for the base paper of paper cups.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] When using waste paper pulp for the base paper of paper cups, there are problems such as inferior strength compared to paper cups made only from virgin pulp, or a large amount of foreign substances (inclusions) being mixed in. In particular, containers used for beverage or food packaging such as paper cups often use bleached pulp, and inclusions tend to be conspicuous.

[0006] The present invention has been made in view of such circumstances, and even when using waste paper pulp, it is an object to provide a paper base material for beverage or food packaging that can maintain the strength of the paper base material and has a good appearance, and a beverage or food packaging container. [Means for solving the problem]

[0007] This invention was made to solve the above-mentioned problems, and the present invention was completed by finding that the problems can be solved by specifying the amount of pulp in each layer of the paper layer of the beverage or food packaging paper base material. The outline of this invention is as follows. [1] A beverage or food packaging paper substrate comprising a multilayer paper having three or more paper layers and a thermoplastic resin layer on at least one surface of the multilayer paper, wherein the three or more paper layers comprise an inner layer, an outer layer, and one or more intermediate layers disposed between the inner layer and the outer layer, the recycled pulp content of the inner layer and the outer layer is less than 10% by mass, each of the intermediate layers contains coniferous pulp and recycled pulp, the total recycled pulp content of the intermediate layers is greater than the total recycled pulp content of the inner layer and the outer layer, and the geometric mean of the interlayer strength of each layer of the paper layers is 55 N / m or more. [2] The beverage or food packaging paper base material according to [1], wherein the inner layer and the outer layer contain 5 to 35% by mass of coniferous pulp. [3] The beverage or food packaging paper base material according to [1] or [2], wherein each of the intermediate layers contains 5% to 35% by mass of coniferous pulp. [4] The beverage or food packaging paper base material according to any one of [1] to [3], wherein the pulp contained in the inner layer and the outer layer is bleached kraft pulp. [5] The beverage or food packaging paper base material according to any one of [1] to [4], wherein the recycled paper pulp is pulp that does not contain fluorescent dyes. [6] A beverage or food packaging paper substrate according to any one of [1] to [5], wherein the inner layer and the outer layer do not contain recycled paper pulp. A beverage or food packaging container made using a beverage or food packaging paper base material as described in any of [7], [1] to [6]. [Effects of the Invention]

[0008] According to the present invention, even when using recycled paper pulp, it is possible to maintain the strength of the beverage or food packaging paper base material and provide a beverage or food packaging paper base material and beverage or food packaging container with a good appearance that is free from noticeable impurities. [Brief explanation of the drawing]

[0009] [Figure 1] This is a conceptual diagram showing the layer structure of the beverage or food packaging paper base material of the present invention. [Figure 2] This is a conceptual diagram showing the layer structure of another embodiment of the beverage packaging paper substrate of the present invention. [Figure 3] This diagram shows blank sheets for the body (a) and bottom (b) of a paper cup. [Figure 4] This is a perspective view of a paper cup with a portion cut out. [Modes for carrying out the invention]

[0010] The beverage or food packaging paper base material and beverage or food packaging container according to the present invention will be described below with reference to the attached drawings. In this specification, "%" and "parts" refer to mass unless otherwise specified. Furthermore, numerical ranges defined using the symbol "~" include the values ​​at both ends of "~" (upper and lower limits).

[0011] [Paper base material for beverage or food packaging] The beverage or food packaging paper substrate of the present invention (hereinafter also referred to as "beverage packaging paper substrate") is a multilayer paper having three or more paper layers and a thermoplastic resin layer on at least one surface of the multilayer paper, wherein the three or more paper layers have an inner layer, an outer layer, and one or more intermediate layers disposed between the inner and outer layers, the amount of recycled paper pulp in the inner and outer layers is less than 10% by mass, each of the intermediate layers contains softwood pulp and recycled paper pulp, the total amount of recycled paper pulp in the intermediate layers is greater than the total amount of recycled paper pulp in the inner and outer layers, and the geometric mean of the interlayer strength of each layer of the paper layers is 55 N / m or more.

[0012] (Layer structure) First, the layer structure of the paper base material for packaging beverages or the like will be described. FIG. 1 is a conceptual diagram showing the layer structure of the paper base material for packaging beverages or the like according to the present invention. As shown in FIG. 1, the paper layer 18 of the paper base material 10 for packaging beverages or the like according to the present invention includes an inner layer 12, an outer layer 14, and one intermediate layer 16 disposed between the inner layer 12 and the outer layer 14. In FIG. 1, a thermoplastic resin layer 20 such as a polyethylene laminate layer is provided on the surface of the inner layer 12 opposite to the intermediate layer 16. Generally, the inner layer means the layer on the content side such as beverages. Whether the surface layer or the back layer of the paper base material for packaging beverages or the like is used as the inner layer can be appropriately selected.

[0013] <Intermediate layer> The intermediate layer 16 of the paper base material 10 for packaging beverages or the like according to the present invention contains waste paper pulp. [[ID=十四]]The waste paper pulp is not particularly limited, but includes waste paper used for beverages or food, corrugated waste paper, unprinted waste paper such as high white, special white, medium white, and white waste, waste paper pulp obtained by dissociating waste paper printed on high-quality paper, high-quality coated paper, medium-quality paper, medium-quality coated paper, and recycled paper, and waste paper with handwriting, papers such as discarded confidential documents, waste paper from magazines and newspapers after dissociation and deinking (DIP), etc. One kind or a mixture of two or more kinds can be used. Also, for the broke (waste paper) obtained by re-dissociating the cut ends and defective products generated during the processing of the base paper (such as printing and laminating), etc., it can also be used as the waste paper in this application. <00^0090>

[0014] Among these, it is preferable to use waste paper pulp obtained by dissociating waste paper used for paper cups and beverages or food in the paper base material 10 for packaging beverages or the like according to the present invention. Since the present invention is a paper base material for beverage or food packaging, it is preferable that the material does not contain a fluorescent dye. In order to obtain a material that does not contain a fluorescent dye, for example, by using the above-mentioned paper cups and waste paper pulp used for beverages or food, it is possible to prevent the mixing of fluorescent materials.

[0015] By using waste paper pulp in the intermediate layer 16, the interlayer strength may decrease compared to the case where waste paper pulp is not used. When the interlayer strength decreases, wrinkles or buckling may occur when the paper base material 10 for beverage packaging or the like is formed into a beverage or food packaging container (hereinafter also referred to as "beverage packaging container, etc."). Therefore, the intermediate layer 16 contains softwood pulp. By containing softwood pulp, it is possible to prevent the interlayer strength from decreasing.

[0016] The blending amount of waste paper pulp in the intermediate layer 16 can be arbitrarily adjusted as long as it is 1% or more. Generally, it is 10% by mass to 95% by mass, preferably 20% by mass to 85% by mass, and more preferably 40% by mass to 80% by mass. By setting the blending amount of waste paper pulp within the above range, the physical properties of the paper base material 10 for beverage packaging or the like can be improved, and the recycling rate of waste paper can be increased.

[0017] In addition, the blending amount of softwood pulp contained in the intermediate layer is 5% by mass to 35% by mass, preferably 10% by mass to 35% by mass, and more preferably 10% by mass to 30% by mass. By setting the blending amount of softwood pulp within the above range, the interlayer strength can be improved.

[0018] In addition to the above waste paper pulp and softwood pulp, the intermediate layer 16 can use pulp commonly used in paper base materials. Pulps that can be used include chemical pulps such as hardwood bleached kraft pulp (LBKP), hardwood unbleached kraft pulp (LUKP), and sulfite pulp, mechanical pulps such as stone ground pulp and thermomechanical pulp, deinked pulp, and non-wood fibers obtained from kenaf, bamboo, hemp, etc. These can be used alone or in combination of two or more.

[0019] Furthermore, it is preferable that the softwood pulp and hardwood pulp used in the intermediate layer 16 be bleached kraft pulp. By using bleached kraft pulp, the appearance of the intermediate layer 16 can be made white. As shown in Figure 1, since the intermediate layer 16 is placed between the inner layer 12 and the outer layer 14, the color of the intermediate layer 16 is not directly visible, but by making the intermediate layer 16 white, the appearance of the beverage packaging paper base material 10 can be made whiter. As a result, when printing on the beverage packaging paper base material 10, printing can be performed without worrying about the appearance.

[0020] <Inner and outer layers> The inner layer 12 and the outer layer 14 are layers provided on both sides of the intermediate layer 16. The inner layer 12 and outer layer 14 of the beverage packaging paper base material 10 of the present invention are preferably made of virgin pulp. As virgin pulp, bleached softwood kraft pulp (NBKP), unbleached softwood kraft pulp (NUKP), bleached hardwood kraft pulp (LBKP), and unbleached hardwood kraft pulp (LUKP) can be used.

[0021] In this embodiment, it is preferable to blend softwood pulp into the inner layer 12 and the outer layer 14. The softwood pulp content of each layer of the inner layer 12 and the outer layer 14 is preferably 5 to 35% by mass, more preferably 10 to 35% by mass, and even more preferably 10 to 30% by mass.

[0022] As described above, the beverage packaging paper base material 10 of the present invention is susceptible to a decrease in interlayer strength due to the incorporation of recycled paper pulp into the intermediate layer 16. Furthermore, in the manufacturing of paper cups, as described later, the ends of the body are folded inward, the ends of the bottom are folded between these inwardly folded ends, and the body and bottom are bonded by heat sealing. Due to the decrease in interlayer strength between the layers, there is a concern that a large force will be applied to the bonded portion of the body and bottom due to the pressure during the folding and heat sealing (bonding) processes during manufacturing, causing wrinkles or buckling in that portion. By including softwood pulp in the above-mentioned proportions, the interlayer strength between the inner layer 12 and the intermediate layer 16, and the interlayer strength between the outer layer 14 and the intermediate layer 16 can be improved, thereby preventing the occurrence of wrinkles and buckling.

[0023] Furthermore, the softwood pulp and hardwood pulp contained in the inner layer 12 and outer layer 14 may be either bleached pulp or unbleached pulp, but it is preferable to use bleached kraft pulp. By using bleached pulp, the appearance of the packaging paper base material for beverages, etc., can be made whiter, thus improving the appearance.

[0024] Furthermore, since the intermediate layer 16 contains recycled paper pulp, there is a concern that impurities may be mixed in, resulting in a deterioration of its appearance. By providing an inner layer 12 and an outer layer 14, the intermediate layer 16 can be covered by the inner layer 12 and the outer layer 14, so that even if impurities are mixed in the intermediate layer 16, the appearance of the beverage packaging paper base material 10 can be made good.

[0025] Furthermore, if an unbleached appearance and texture are required, unbleached kraft pulp may be included as part of the pulp. The content of unbleached kraft pulp in the total pulp is preferably 70% by mass or less, and more preferably 50% by mass or less.

[0026] Furthermore, while it is preferable that the inner layer 12 and outer layer 14 do not contain recycled paper pulp, they may contain less than 10% in each layer. By not including recycled paper pulp in the inner layer 12 and outer layer 14, it is possible to prevent defects in appearance due to impurities. It is also possible to prevent a decrease in interlayer strength. In addition to the recycled paper pulp contained in the intermediate layer, recycled paper pulp obtained by disintegrating unused recycled paper from which excess portions for product manufacturing have been cut off can also be used.

[0027] <Thermoplastic resin layer> In this embodiment, at least one side of the beverage packaging paper base material 10 has a thermoplastic resin layer 20. A polyethylene laminate layer is an example of the thermoplastic resin layer 20. When the beverage packaging paper base material 10 of the present invention is used for paper cups, it is preferable that the thermoplastic resin layer 20 be provided on the side that will be the inside of the manufactured paper cup, from the viewpoint of water resistance. In Figure 1, the thermoplastic resin layer 20 is shown as being provided on the side of the inner layer 12 opposite to the intermediate layer 16, with the inner layer 12 side being the inside of the container. However, the thermoplastic resin layer 20 may also be provided on both sides of the inner layer 12 opposite to the intermediate layer 16 and the outer layer 14 opposite to the intermediate layer 16.

[0028] If the thermoplastic resin layer 20 is a polyethylene laminate layer, the polyethylene may be polyethylene derived from fossil fuels, polyethylene derived from biomass, or a mixture thereof.

[0029] In the production of biomass-derived ethylene, it is preferable to use biomass-derived fermented ethanol obtained from plant materials as a raw material. Examples of plant materials include, but are not limited to, corn, sugarcane, and beets. Furthermore, the method for polymerizing monomers containing biomass-derived ethylene is not particularly limited and can be carried out by known methods.

[0030] The polyethylene constituting the polyethylene laminate layer is not particularly limited, and can be low-density polyethylene (LDPE), high-density polyethylene resin (HDPE), a mixed resin of high-density polyethylene resin and low-density polyethylene resin, linear low-density polyethylene resin (LLDPE), or a mixed resin of linear low-density polyethylene resin and low-density polyethylene resin.

[0031] The thickness of the polyethylene laminate layer can be set arbitrarily according to the required properties, but for example, 10 μm to 100 μm is preferred, 12 μm to 70 μm is more preferred, and 10 μm to 30 μm is even more preferred.

[0032] Furthermore, the thermoplastic resin layer 20 can also be a coated layer coated with polyethylene resin or the like. The coated layer can be laminated using a commonly used coating agent as long as it is heat-sealable, and the type is not particularly limited. When a thermoplastic resin layer 20 is laminated as a coating layer, the thickness of the coating layer is preferably, for example, 1 μm to 30 μm, more preferably 1 μm to 20 μm, and even more preferably 5 μm to 20 μm.

[0033] When the beverage packaging paper base material 10, which consists of the paper layer 18 and the thermoplastic resin layer 20 described above, is used as, for example, a paper cup, it is necessary to maintain a certain level of strength in the beverage packaging paper base material 10, so it is preferable to use a relatively thick beverage packaging paper base material 10. The basis weight of the paper layer 18 used in the beverage packaging paper base material 10 is 80 to 400 g / m². 2 Preferably, 140-350 g / m² 2 This is preferable. When using relatively thick base paper, it is preferable that the paper be multi-layered rather than single-layered. The number of paper layers 18 can be determined by the total basis weight, and the basis weight of each layer of paper layers 18 should be 50-70 g / m². 2Therefore, the total basis weight is approximately 200g / m². 2 If you want to achieve a certain level of quality, use a 3-layer papermaking process with a total basis weight of 300g / m². 2 If you want to achieve a certain degree of quality, you can use a 5-layer papermaking process.

[0034] Figure 2 is a conceptual diagram showing the layer structure of another embodiment of the beverage packaging paper substrate of the present invention. The beverage packaging paper substrate 30 shown in Figure 2 differs from the beverage packaging paper substrate 10 shown in Figure 1 in that it has three intermediate layers 36a, 36b, and 36c.

[0035] To increase the basis weight of the paper layer 38, the basis weight of the paper layer 38 can be increased by using multiple intermediate layers. As shown in Figure 2, when multiple layers consisting of three intermediate layers 36a, 36b, and 36c are used, each of the intermediate layers 36a, 36b, and 36c is blended to satisfy the amount of recycled paper pulp and softwood pulp used in the intermediate layer 16 shown in Figure 1. By satisfying the above-mentioned pulp blend amount in each of the intermediate layers 36a, 36b, and 36c, the interlayer strength between each of the intermediate layers 36a, 36b, and 36c can be improved, preventing the occurrence of wrinkles and buckling.

[0036] The geometric mean of the interlayer strength of each layer of the paper layer 18 of the beverage packaging paper substrate 10 in Figure 1, and the interlayer strength of each layer of the paper layer 38 of the beverage packaging paper substrate 30 in Figure 2, is 55 N / m or more, and more preferably 60 N / m or more. Furthermore, there is no particular upper limit, but it is preferably 120 N / m or less, and more preferably 100 N / m or less.

[0037] Furthermore, the paper layers 18 and 38 may be laminated using an adhesive to improve the interlayer strength of each layer. As the adhesive, dispersions of various starches can be sprayed or applied between the layers.

[0038] (Beverage or food packaging containers) Next, we will describe beverage or food packaging containers using the above-mentioned beverage or food packaging paper base material. In the following, we will describe a paper cup as one embodiment of a beverage packaging container. However, the beverage packaging containers used with the above-mentioned beverage or food packaging paper base material are not limited to paper cups and can be used for various beverage packaging containers.

[0039] Figure 3 shows blank sheets for the body (a) and bottom (b) of a paper cup used in the manufacturing of paper cups. Figure 4 is a perspective view with a portion of the paper cup cut out. As shown in Figure 3(a), the body 52 of the paper cup has a fan shape, and as shown in Figure 3(b), the bottom 62 has a circular shape. When forming the paper cup, the surface 55 including one end 54 of the blank body 52 and the surface 57 including the other end 56 are overlapped to form a cylindrical shape. The bottom 62 is folded around one side to form a bent portion 64 (see Figure 4). Then, a bottom portion 62 with a bent portion 64 formed thereon is supplied to a cylindrical body portion 52. In this state, the inner surface of the body portion 52 and the bent portion 64 of the bottom portion 62 are melted at the bonding point by any method such as hot air, ultrasonic waves, or direct flame, and then pressed together by a jig. After the bent portion 64 of the bottom portion 62 is bonded to the body portion 52, the lower end of the body portion 52 is folded inward so as to sandwich the bent portion 64 of the bottom portion 62, forming a folded portion 58. The bent portion 64 of the bottom portion 62 is sandwiched between the inner surface of the body portion 52 and the folded portion 58, the bonding point is melted with hot air, and then pressed together by a jig to form the bottom portion 62 shown in Figure 4. Furthermore, by performing a top curl, which involves folding the upper part of the body portion 52 outward, the paper cup 50 shown in Figure 4 can be formed.

[0040] When forming the paper cup 50, the thermoplastic resin layer is formed so that it faces inward. Since the thermoplastic resin layer is water-resistant, by having the thermoplastic resin layer on the inside, liquid can be placed inside the paper cup 50.

[0041] As described above, when manufacturing paper cups, the folded portion 64 of the bottom portion 62 is sandwiched between the folded portion 58, which is the lower end of the body portion 52, and the inner surface of the body portion 52, and then heat-sealed to bond them together. When heat-sealing, pressure is applied to the paper cup 50, and a large force is applied to the area where this pressure is applied. Therefore, if the interlayer strength is low, wrinkles may occur in the paper cup 50. In addition, buckling may occur during heat sealing. According to this embodiment, the interlayer strength of the paper base material for beverage packaging is increased, which prevents wrinkles, buckling, and the like from occurring. Furthermore, by using virgin pulp instead of recycled pulp for the inner and outer layers, which are the surface layers of the paper substrate for beverage packaging, it is possible to prevent appearance defects such as the visibility of foreign matter on the surface of the paper substrate for beverage packaging. [Examples]

[0042] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to the following examples.

[0043] (Materials used) • Bleached coniferous pulp (NBKP) (indicated as "N" in Table 1): Commercially available product • Bleached hardwood pulp (LBKP) (indicated as "L" in Table 1): Commercially available product • Recycled paper pulp (labeled "recycled" in Table 1): Recycled paper pulp obtained by extracting only the pulp portion from paper cups, and laminated waste paper and waste paper used for beverages or food products.

[0044] (Evaluation method) <Basic weight> The area and mass of the manufactured paper layers were measured and calculated. <Whiteness> The manufactured paper layers were measured in accordance with JIS P 8148. <Interlayer strength> The manufactured paper layers were measured in accordance with JIS K6854-3:1994. <Wrinkle formation> Paper cups were manufactured using the manufactured beverage packaging paper base material, and the occurrence of wrinkles and buckling was confirmed by visual inspection of the paper cups. ○: No wrinkles or buckling were observed. ×: Wrinkles and buckling were observed at the joint between the body and the base. <Appearance (Contamination)> Image analysis revealed the surface of the manufactured paper cup (1m). 2 The number of impurities per unit area was calculated. ○: The number of foreign objects (defects) on the surface of the paper cup is 1.0 or less / m 2 That was the case. ×: The number of foreign objects (defects) on the surface of the paper cup is 1.0 per meter. 2 It exceeded expectations.

[0045] (Example 1) An intermediate layer was formed using the pulp composition ratios shown in Table 1. An inner layer and an outer layer were then formed on the front (inner layer) and back (outer layer) of this intermediate layer, again using the pulp composition ratios shown in Table 1, to produce a paper layer. A polyethylene laminate layer was then laminated to the inner layer side of the produced paper layer. The thickness of the polyethylene laminate layer was 15 μm. Using the manufactured beverage packaging paper base material, paper cups were produced using the following manufacturing method. First, as shown in Figure 3, blanks for forming the body and bottom of the paper cup were punched out using a die with a blade to create the blanks. The left and right edges of the body blanks were overlapped and heat-sealed to form the body joint, and the body was formed, joining the bottom and body. Then, the top edge of the body was rolled outwards to form the top curl, and the paper cup was formed. The size of the paper cup was set to 7 ounces. The manufactured paper layers, beverage packaging paper base materials, and paper cups were evaluated using the evaluation method described above.

[0046] (Example 2) A paper base material for beverage packaging was manufactured in the same manner as in Example 1, except that the intermediate layer was made of three layers and the pulp content ratio was as shown in Table 1.

[0047] (Comparative Examples 1 and 2) A paper base material for beverage packaging was manufactured in the same manner as in Example 1, except that the pulp content ratio was as shown in Table 1.

[0048] The results are shown in Table 1.

[0049] [Table 1]

[0050] Examples 1 and 2, which used recycled paper pulp in the intermediate layer but not in the inner and outer layers, exhibited good interlayer strength, no wrinkles, and a good appearance. Comparative Example 1, which did not contain softwood pulp in the intermediate layer, nor in the inner and outer layers, exhibited low interlayer strength and wrinkle formation. Similarly, Comparative Example 2, which was manufactured using only recycled paper pulp for the inner, intermediate, and outer layers, also showed low interlayer strength, wrinkle formation, and visible impurities. [Industrial applicability]

[0051] This invention enables the recycling of waste paper and can be suitably used as a beverage or food packaging container. [Explanation of Symbols]

[0052] 10, 30 Beverage or food packaging paper base material (beverage packaging paper base material) 12 Inner Layer 14 Outer layer 16, 36a, 36b, 36c middle tier 18, 38 paper layer 20 Thermoplastic resin layer 50 paper cups 52 Torso 54, 56 End 55, 57 sides 58 Folded section 62 Bottom 64 Bend section

Claims

1. A beverage or food packaging paper substrate comprising a multilayer paper having three or more paper layers, and a thermoplastic resin layer on at least one surface of the multilayer paper, The three or more paper layers comprise an inner layer, an outer layer, and one or more intermediate layers positioned between the inner layer and the outer layer. The amount of recycled paper pulp in the inner layer and the outer layer is less than 10% by mass. Each of the intermediate layers contains coniferous pulp and recycled paper pulp, and the total amount of recycled paper pulp in the intermediate layers is greater than the total amount of recycled paper pulp in the inner and outer layers. A paper substrate for beverage or food packaging, wherein the geometric mean of the interlayer strength of each layer of the aforementioned paper layer is 55 N / m or more.

2. The beverage or food packaging paper base material according to claim 1, wherein the inner layer and the outer layer contain 5 to 35% by mass of coniferous tree pulp.

3. The beverage or food packaging paper base material according to claim 1, wherein each of the intermediate layers contains 5% to 35% by mass of coniferous tree pulp.

4. The beverage or food packaging paper base material according to claim 1, wherein the pulp contained in the inner layer and the outer layer is bleached kraft pulp.

5. The beverage or food packaging paper base material according to claim 1, wherein the recycled paper pulp is pulp that does not contain fluorescent dyes.

6. The beverage or food packaging paper substrate according to claim 1, wherein the inner layer and the outer layer do not contain recycled paper pulp.

7. A beverage or food packaging container made using a beverage or food packaging paper base material according to any one of claims 1 to 6.

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