Paper container base material, paper container, and paper container base material manufacturing system

Abstract

To provide a paper container base material that enables automatic continuous checking of inspecting a coating of a release agent in an easy-peel area, a paper container composed of the same, and a manufacturing system for manufacturing the same.SOLUTION: An easy-peel area 21 is provided on an inner surface of an inner top seal panel 17 of a gable wall forming panel 7 folded between gable roof forming panels 5 and 6. Easy-peel areas 22, 23 are provided at approximately half the horizontal length direction and closer to the inner top seal panel 17 on the inner surface of outer top seal panels 13 and 14 of gable roof forming panels located both sides of the easy-peel area 21, leaving end part seals 25, 26 of a predetermined width at a portion closer to the inner top seal panel 17. The easy-peel areas 21, 22, 23 are a paper container base material 9 having a fluorescent material.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a paper container substrate, a paper container, and a paper container substrate manufacturing system. [Background technology]

[0002] Conventionally, a widely used paper container for storing liquid contents such as milk or juice is a gable roof-type paper container which is made of a paperboard material with thermoplastic resin laminated on the front and back sides, has four body panels, the edges of which are joined by vertical seal panels to form a square cylindrical body, and is connected to the upper ends of the body panels with a pair of gable roof forming panels facing each other and having an outer top seal panel at their upper parts, and a pair of gable wall forming panels facing each other and having an inner top seal panel at their upper parts, one of which serves as a pouring outlet and can be opened, the pair of gable wall forming panels being folded between the pair of gable roof forming panels, and the outer top seal panel and the inner top seal panel being heated and sealed at predetermined positions to form a hermetic seal, thereby forming the top.

[0003] In order to make such gable roof type paper containers easier to open, for example, as shown in Patent Document 1 below, easy-peel areas with a release agent applied to the opposing surfaces of the inner top seal panel of one of the gable wall forming panels and the outer top seal panel of a pair of gable roof forming panels facing the inner top seal panel are provided. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2013-47119 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the past, inspections of the application of release agent to the easy-to-peel area were carried out by manually applying a special chemical to randomly sampled paper container base materials and checking the color change. However, the current sampling inspection is a manual inspection, and in terms of securing inspection personnel, it is difficult to inspect all products, or it is difficult to increase the inspection frequency for each product, which may result in abnormalities being overlooked, so automating the inspection has been a long-standing challenge.

[0006] Based on the above, the present invention aims to provide a paper container base material that can automatically and continuously check the application of release agent in easy-to-peel areas, a paper container made of this paper container base material, and a manufacturing system for producing this paper container base material. [Means for solving the problem]

[0007] As a result of intensive research to solve the above problems, the present inventors have conceived the following invention and found that the above problems can be solved. [1] A paperboard material laminated with thermoplastic resin on both sides, equipped with four body panels, the edges of which are joined by vertical seal panels to form a tubular body with a square cross section, a pair of gable roof forming panels facing each other and having a band-shaped outer top seal panel at the top, and a pair of gable wall forming panels facing each other and having a band-shaped inner top seal panel that is lower in height than the outer top seal panel are connected to the upper ends of the body panels, the gable wall forming panels are folded between the gable roof forming panels, and the opposing surfaces of the opposing outer top seal panels and the inner top seal panels are heat-sealed, and the opposing surfaces of the outer top seal panels and the opposing surfaces of the inner top seal panels are also heat-sealed to form a gable roof. a paper container base material from which a paper container can be assembled, the paper container base material having an inner surface of the inner top seal panel of one of the gable wall forming panels which is folded between the gable roof forming panels, the inner surface of which has an inner top seal panel having a shaped top, and which has an easy-peel area at both ends in the horizontal length direction, leaving an end seal area of ​​a predetermined width, and the inner surface of the outer top seal panel of a pair of gable roof forming panels located on both sides of the inner top seal panel has an easy-peel area in approximately half of the horizontal length direction, near the inner top seal panel, leaving an end seal area of ​​a predetermined width near the inner top seal panel, and when opened, the gable wall forming panel on the side having the inner top seal panel with the easy-peel area provided is pulled out to form an opening, and the easy-peel area comprises a fluorescent material. [2] The paper container substrate according to [1], wherein the fluorescent material is any one of riboflavin, riboflavin sodium phosphate, and riboflavin butyrate. [3] The fluorescent material is applied in an amount of 4×10 per unit area of ​​the easily peelable region. -4 g / m 2 The paper container substrate according to [1] or [2], comprising: [4] A paper container comprising the paper container base material according to any one of [1] to [3]. [5] A paper container substrate manufacturing system for manufacturing the paper container substrate described in any one of [1] to [3], comprising: an application means for applying a release agent containing a fluorescent material to an easy-peel area of ​​the paper container substrate; an irradiation means for irradiating the easy-peel area with ultraviolet light; a detection means for detecting the fluorescent material applied to the easy-peel area; and a removal means for removing the paper container substrate in which the fluorescent material is not detected in the easy-peel area by the detection means. [6] The paper container substrate manufacturing system described in [5], wherein the removal means removes the paper container substrate in which the fluorescent material is detected in the easy-peel area by the detection means and in which the fluorescent material is also detected in areas other than the easy-peel area. [7] The paper container substrate manufacturing system according to [5] or [6], wherein the concentration of the fluorescent material in the release agent is 1 to 1000 ppm. Effect of the Invention

[0008] According to the present invention, it is possible to provide a paper container base material that can automatically and continuously check the application of release agent in easy-peel areas, a paper container made of this paper container base material, and a manufacturing system for manufacturing this paper container base material. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is an exploded view of an internal main portion showing one embodiment of a paper container base material according to the present invention. [Diagram 2] 2 is a perspective view showing a main part of a paper container made of the paper container base material shown in FIG. 1. [Diagram 3] FIG. 3 is an explanatory diagram showing the paper container shown in FIG. 2 in an opened state. [Figure 4] FIG. 1 is a block diagram showing an example of a paper container substrate manufacturing system of the present invention. [Diagram 5] FIG. 2 is a conceptual diagram illustrating an example of an inspection unit. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, a paper container base material according to the present invention, a paper container made of this paper container base material, and a manufacturing system for manufacturing this paper container base material will be described with reference to the attached drawings.

[0011] <Paper container base material, paper container> Fig. 1 is an exploded view of the main internal parts showing one embodiment of a paper container base material according to the present invention. Fig. 2 is a perspective view showing the main parts of a paper container made of the paper container base material shown in Fig. 1, and Fig. 3 is an explanatory diagram showing the paper container in an opened state.

[0012] The paper container base material 9 is a base material that is assembled to form the paper container 1 shown in Fig. 2, and is made of a paperboard material with thermoplastic resin laminated on both sides. The paper container 1 is formed into a tubular body with a square cross section by folding four body panels 2 along vertical fold lines 3 and joining the body panels 2 on one side and the other side with vertical seal panels 4 that serve as glue tabs. A pair of opposing gable roof forming panels 5, 6 and a pair of opposing gable wall forming panels 7, 8 that are folded between the gable roof forming panels 5, 6 are connected to the opposing upper ends of the four body panels 2 via horizontal fold lines 10. Band-shaped outer top seal panels 13, 14 are provided at the upper ends of the gable roof forming panels 5, 6 via horizontal fold lines 11, 12, respectively, and band-shaped inner top seal panels 17, 18 are also provided at the upper ends of the gable wall forming panels 7, 8 via horizontal fold lines 15, 16, respectively. The height dimension of the band of the inner top seal panels 17, 18 is formed lower than that of the outer top seal panels 13, 14.

[0013] Then, the gable wall forming panels 7, 8 are folded between the gable roof forming panels 5, 6, and the opposing surfaces of the opposing outer top seal panels 13, 14 and inner top seal panels 17, 18 are heat sealed, and the opposing surfaces of the outer top seal panels 13, 14 and the inner top seal panels 17, 18 are also heat sealed to form a gable roof top 19.When opening, the inner top seal panel 17 of one of the gable wall forming panels 7 folded between the gable roof forming panels 5, 6 is peeled off from the outer top seal panels 13, 14, and this one gable wall forming panel 7 is pulled out to form an opening 20 which serves as a pouring outlet (Figure 3).

[0014] In order to make opening easy, easy-peel areas 21, 22, 23 are provided on the opposing surfaces of the inner top seal panel 17 of one of the gable wall forming panels 7 that is pulled out to open the opening 20, and the outer top seal panels 13, 14 of the pair of gable roof forming panels 5, 6 that face the inner top seal panel 17, and the inner top seal panel 17 and the outer top seal panels 13, 14 are heat-sealed via the easy-peel areas 21, 22, 23.

[0015] As for the easy-peel regions 21, 22, 23 provided on the opposing surfaces of the inner top seal panel 17 of one of the gable wall forming panels 7 that is pulled out to open the opening 20, and the outer top seal panels 13, 14 of the pair of gable roof forming panels 5, 6 located on both sides of it, as shown in Figure 1, the easy-peel region 21 is provided on the inner surface of the inner top seal panel 17, leaving end seal areas 24 of a predetermined width A at both ends in the horizontal length direction, and the easy-peel regions 22, 23 are provided on the inner surface of the outer top seal panels 13, 14, approximately halfway in the horizontal length direction, near the inner top seal panel 17, leaving end seal areas 25, 26 of a predetermined width B near the inner top seal panel 17.

[0016] The end seal areas 24 at both ends of the easy-peel area 21 provided on the inner top seal panel 17, and the end seal areas 25, 26 at the ends of the easy-peel areas 22, 23 provided on the outer top seal panels 13, 14 on both sides of the easy-peel area 21 near the inner top seal panel 17 are heat-sealed to prevent leakage of the contents.

[0017] Furthermore, by providing the easy-peel areas 21, 22, and 23, even if the outer top seal panels 13, 14 and the inner top panel 17 are heat sealed, the easy-peel areas 21, 22, and 23 will not weld, making it easy to open the paper container.

[0018] The easy peeling regions 21, 22, and 23 are formed by applying a release agent. The release agent may be at least one selected from silicone-based resins, alkyd-based resins, and the like. These resins may be dissolved in a solvent before use. The solvent may be either water-based or oil-based.

[0019] In this embodiment, the release agent further contains a fluorescent material that emits fluorescence under ultraviolet light. The fluorescent material may be a riboflavin-based compound, and preferably contains at least one selected from riboflavin, riboflavin sodium phosphate, and riboflavin butyrate. Among them, riboflavin butyrate is preferred because it emits light in a small amount.

[0020] The amount of the fluorescent material applied to the easy peeling regions 21, 22, and 23 is 4×10 -4 g / m 2 Preferably, it is 4×10 or less. -5 g / m 2 More preferably, it is 3×10 -5 g / m 2 It is more preferable that the amount of the riboflavin-based compound per unit area of ​​the easily peelable regions 21, 22, and 23 is 4×10 -5 g / m 2The amount of the fluorescent material is preferably less than the amount required for the paper container to be removed, since the paper container is transparent or the color is difficult to recognize with the naked eye, but can be colored under ultraviolet light irradiation. The lower limit is not particularly limited as long as the application of the release agent can be confirmed under ultraviolet light irradiation and the paper container base material in which the fluorescent material is not detected in the easy peel regions 21, 22, and 23 can be removed. Furthermore, the amount of the fluorescent material is preferably such that the paper container base material in which the fluorescent material is detected in regions other than the easy peel regions 21, 22, and 23 can be removed.

[0021] <Paper container base material manufacturing system> Next, the paper container substrate manufacturing system of the present invention will be described. Fig. 4 is a block diagram showing an example of the paper container substrate manufacturing system of the present invention. Fig. 5 is a schematic diagram showing an example of an inspection unit.

[0022] The paper container manufacturing system 100 of this embodiment includes a paper feeding unit 110, a printing unit 120, a final drying unit 130, a release agent application unit 135, an inspection unit 140, a cutting unit 150, a removing unit 160, and a discharge unit 170. Each component of the paper container substrate production system 100 will be described below.

[0023] (Feed unit) The paper feed unit 110 is a means for supplying a paper base material that is a material for the paper container base material. Since the paper base material is usually wound in a roll and installed in the paper container manufacturing system 100, the paper base material is unwound and supplied to the next printing unit 120. As the paper feed unit 110, for example, an unwinder can be used.

[0024] (Printing unit) The printing unit 120 is a means for printing and drying the product name, content name, product name, indication, picture, etc. by color on the outside of the paper container base material 9. The printing method is not particularly limited, and known methods such as offset printing, gravure printing, flexographic printing, inkjet printing, and laser beam printing can be used.

[0025] (Final drying unit) The final drying unit 130 is a means for performing final drying of the characters, pictures, etc. printed by the printing unit 120 under ultraviolet light.

[0026] (Removal agent application unit) The release agent application unit 135 is a means for applying a release agent to the easy-peel regions 21, 22, and 23 (see FIG. 1) of the paper container substrate 9. The application means is not particularly limited, and known application means such as a brush, roller, or spray can be used. The release agent can also be applied by known methods such as gravure printing and flexographic printing.

[0027] The release agent applied by the release agent application unit 135 is at least one selected from the above-mentioned silicone-based resin, alkyd-based resin, and the like. These resins can be used by dissolving them in a solvent, and the solvent can be either water-based or oil-based. By applying a release agent containing at least one selected from the silicone-based resin and the alkyd-based resin, the portion to which the release agent is applied is not welded by heat, making it easier to peel off when forming an opening.

[0028] The release agent contains a fluorescent material that emits fluorescence under ultraviolet light. Examples of the fluorescent material include riboflavin-based compounds, and it is preferable to contain at least one selected from riboflavin, riboflavin sodium phosphate, and riboflavin butyrate. Among them, riboflavin butyrate is preferable because it emits light in a small amount.

[0029] The content of the fluorescent material is preferably 1 ppm or more and 1000 ppm or less, more preferably 5 ppm or more and 200 ppm or less, even more preferably 30 ppm or more and 100 ppm or less, and most preferably 60 ppm or more and 80 ppm or less, based on the total amount of the release agent. By making the content of the fluorescent material 1 ppm or more, the amount of the release agent applied is not too large, and it is possible to confirm that the release agent has been applied by irradiating with ultraviolet light. In addition, by making the content of the fluorescent material 1000 ppm or less, the fluorescent material can be dissolved in the release agent.

[0030] The amount of release agent applied is an amount that facilitates peeling when forming an opening, and it is preferable to apply the release agent so that the amount of fluorescent material applied to the easy-peel areas 21, 22, and 23 is the same as the amount of fluorescent material applied to the paper container substrate 9 described above. Furthermore, the thickness of the coating film after coating and drying of the release agent is preferably 0.05 μm to 10 μm, and more preferably 0.1 μm to 1 μm. Even if the concentration of the fluorescent material in the release agent is low, the fluorescent material can be easily detected in the inspection unit 140 described below by increasing the coating thickness. Furthermore, the coating thickness of the release agent can be reduced by increasing the concentration of the fluorescent material in the release agent. By setting the content of the fluorescent material in the release agent and the coating thickness of the release agent within the above ranges, it is difficult to confirm the application of the release agent with the naked eye, but it is possible to confirm that the release agent has been applied by irradiating it with ultraviolet light.

[0031] (Inspection unit) The inspection unit 140 is a means for inspecting whether the release agent applied by the release agent application unit 135 is applied in an appropriate position. The inspection unit 140 includes transport rolls 142, 143 that transport the paper container base material 9 on which the release agent has been applied by the release agent application unit 135, an irradiation means 144 that irradiates the paper container base material 9 with UV light, and a detection means 145 that detects a fluorescent material contained in the release agent.

[0032] The paper container substrate 9 to which a release agent has been applied in the release agent application unit 135 of the paper container substrate manufacturing system 100 is transported to the inspection unit 140. The paper container substrate 9 transported to the inspection unit 140 is transported by transport rolls 142 and 143, and is irradiated with ultraviolet light by irradiation means 144. As the irradiation means 144, a UV lamp, an ultraviolet LD (laser diode) array, an LED-UV light source, or the like is used.

[0033] The inspection unit 140 includes a detection means 145. The detection means 145 is not particularly limited as long as it can capture an image of the fluorescent material that emits light when irradiated with ultraviolet light, and a commonly used camera can be used. In addition, a monitor that displays the image captured by the camera can be provided as necessary. Furthermore, the detection means 145 includes an image analysis means and a storage unit (not shown). The image detected by the detection means 145 is analyzed by the image analysis means, and it is analyzed whether the color generated by the fluorescent material is applied to a predetermined position, i.e., an easily peelable area. The analysis result is stored in the storage unit.

[0034] (Cutting unit) The cutting unit 150 is a means for cutting the paper container substrate 9 that has passed through the inspection unit 140. The paper container substrate 9 is continuously printed on a continuous paper substrate by the printing unit 120. The cutting unit 150 cuts the paper substrate into individual paper container substrates that have been printed on the paper substrate, thereby making it possible to make paper container substrates that form one paper container.

[0035] (Removal unit) The removal unit 160 is a means for removing paper container substrates that have been inspected by the inspection unit 140 and do not have a release agent applied to a predetermined position, for example, paper container substrates where no fluorescent material is detected in the easy-peel areas 21, 22, and 23, or where fluorescent material is detected outside the easy-peel areas 21, 22, and 23. The analysis results stored in the memory section of the inspection unit 140 are read out by the removal unit 160. Paper container base materials in which no fluorescent material is detected in the easy peel region or in which fluorescent material is detected in places other than the easy peel region are removed by the removal unit 160 because the release agent has not been applied appropriately.

[0036] According to this embodiment, since it is possible to check for defective products for each paper container base material constituting each cut paper container, it is possible to remove only one defective product. This can improve production efficiency. Also, instead of removing only one defective product, it is possible to remove three paper container base materials including those before and after it. By removing three paper container base materials including those before and after it, it is possible to remove paper container base materials that may be defective, and it is possible to remove defective products reliably.

[0037] (Discharge unit) The discharge unit 170 is a means for discharging the manufactured paper container base material. In the discharge unit 170, the paper container base material is inspected by the inspection unit 140, a release agent is applied to a predetermined position, and only the paper container base material that is judged to pass is discharged.

[0038] According to this embodiment, the inspection unit 140 continuously inspects the paper container base material coated with the release agent, and the removal unit can remove the paper container base material that does not have the release agent applied in the specified position, so that the inspection can be performed automatically and the work efficiency can be improved. Also, compared to the conventional method of sampling and inspecting, since all the paper container base materials can be inspected, the occurrence of defective products can be further suppressed. EXAMPLES

[0039] (Experimental Example 1) As a sample test, a release agent containing fluorescent material dissolved in the concentration shown in Table 1 was manually applied to a carton (paper container base material) and the degree of fluorescence when irradiated with ultraviolet light was confirmed. In addition, the solubility of the fluorescent material in the release agent, the color of the release agent containing fluorescent material, and the odor after application were also confirmed.

[0040] (Materials used) Water-based release agent: H141 Release Agent JK (product name), manufactured by Toyo Ink Co., Ltd. Oil-based release agent: Polycoat P-91JC-4 (product name), manufactured by DIC Graphics Co., Ltd. Riboflavin (fluorescent material): Reagent Riboflavin phosphate sodium (fluorescent material): Reagent Riboflavin butyrate (fluorescent material): Reagent

[0041] (Evaluation method) [Solubility in release agent]: The fluorescent material was added to the release agent, and the solubility was evaluated according to the following criteria. A: It dissolved easily in the stripping agent. B: Dissolved in the stripping agent by stirring or shaking. C: Did not dissolve in the stripping agent. [Color of the stripping agent after dissolution]: This was confirmed by visual inspection. [Odor after application to carton]: The release agent was applied to the carton, and the odor after drying was checked by smelling it. The test was performed by three people and rated according to the following criteria. A: Two or more people felt there was no smell. B: Two people thought there was an odor. C: Three people thought there was an odor. [Fluorescence degree under ultraviolet light]: After a release agent was applied to the carton, it was irradiated with ultraviolet light and visually evaluated according to the following criteria. A: The color development was clearly observed. B: Color development was confirmed. C: Although weaker than A and B, the color was clearly visible to the naked eye. D: Could not confirm. The results are shown in Table 1.

[0042] [Table 1]

[0043] Riboflavin, riboflavin sodium phosphate, and riboflavin butyrate were dissolved in a stripping agent and irradiated with ultraviolet light to confirm color development. For riboflavin butyrate, color development was clearly observed at a concentration of 100 ppm, so an evaluation was also performed at 10 ppm. Even at a concentration of 10 ppm, the color development was weak, but was still visible to the naked eye.

[0044] (Experimental Example 2) As a preliminary test to determine the appropriate concentration of the fluorescent material, a test sample was prepared using a release agent containing the same concentration of fluorescent material as in Example 1, and an offline test was performed to confirm the application of the release agent using an offline device and the detection of the fluorescent material. In addition, as a practical test, the release agent was applied by printing application using a printing device online, and it was confirmed whether the fluorescent material could be detected by irradiating it with ultraviolet light. The dry film thickness of the release agent after application and drying was 0.3 μm in both cases.

[0045] (Materials used) Release agent: Polycoat P-91JC-4 (product name), manufactured by DIC Graphics Co., Ltd. Fluorescent material: Riboflavin butyrate, Reagent

[0046] (Evaluation method) The possibility of detecting the release agent was checked by checking whether the fluorescent material in the easy-to-peel region was detected, and the possibility of detecting an abnormality was checked by checking whether the fluorescent material outside the easy-to-peel region was detected, and the evaluation was performed according to the following criteria: If the fluorescent material in the easy-to-peel region can be detected, it can be detected automatically, so a test that was evaluated as ◯ for the possibility of detecting the release agent was deemed to have passed. 〇: Detection possible without problems △: May not be detected ×: Undetectable -: Not implemented

[0047] [Table 2]

[0048] As shown in Table 2, the stripping agent could be detected at all concentrations tested. In addition, when the concentration of the fluorescent material was low, it was sometimes impossible to detect the fluorescent material outside the easy-to-peel region, but by increasing the concentration, it became possible to detect the fluorescent material outside the easy-to-peel region.

[0049] It was confirmed that it was possible to detect the release agent even when application was performed using a release agent application unit. [Industrial Applicability]

[0050] The paper container base of the present invention is suitable for use in gable-top paper containers having a gable roof top, since it is possible to reliably confirm that a release agent has been applied thereto. [Explanation of symbols]

[0051] 1 Paper container 2. Body Panel 3 Vertical fold line 4 Vertical Seal Panel 5, 6 Gable roof forming panel 7, 8 Gable wall forming panel 9 Paper container base material 10, 11, 12 Horizontal fold lines 13, 14 Outer top seal panel 15, 16 Horizontal fold lines 17, 18 Inner top seal panel 19 Gable roof top 20 Opening 21, 22, 23 Easy peel area 24, 25, 26 End seal area 100 Paper container base material manufacturing system 110 Paper feed unit 120 printing units 130 Final Drying Unit 135 Release agent application unit 140 Inspection Unit 142, 143 Transport roll 144 Irradiation means 145 Detection Methods 150 Cutting Unit 160 Removal Unit 170 Emission Unit A, B End seal area width

Claims

1. a pair of gable roof forming panels facing each other and having a band-shaped outer top seal panel at the top, and a pair of gable wall forming panels facing each other and having a band-shaped inner top seal panel that is lower in height than the outer top seal panels, are connected to the upper ends of the body panels; the gable wall forming panels are folded between the gable roof forming panels, and the opposing surfaces of the opposing outer top seal panels and the inner top seal panels are heat-sealed, and the opposing surfaces of the outer top seal panels and the opposing surfaces of the inner top seal panels are also heat-sealed to form a gable roof-shaped top; a paper container base material for assembling a paper container in which, when opened, the gable wall forming panel on the side having the inner top seal panel with the easy peel area being provided at both ends in the horizontal length direction, leaving an end seal area of ​​a predetermined width, and a pair of gable roof forming panels on either side of the inner top seal panel with the outer top seal panel having an easy peel area being provided in a portion of the inner surface near the inner top seal panel in approximately half of the horizontal length direction, leaving an end seal area of ​​a predetermined width near the inner top seal panel; The paper container substrate, wherein the easily peelable region comprises a fluorescent material.

2. The paper container substrate according to claim 1 , wherein the fluorescent material is one of riboflavin, riboflavin sodium phosphate, and riboflavin butyrate.

3. The fluorescent material is applied to the easily peelable region in an amount of 4×10 －４ g / m ２ The paper container substrate according to claim 1 or 2, comprising:

4. A paper container comprising the paper container base material according to claim 1 or 2.

5. A paper container substrate manufacturing system for manufacturing the paper container substrate according to claim 1 or 2, A coating means for coating a release agent containing a fluorescent material onto the easy-peel region of the paper container base material; An irradiation means for irradiating the easy peeling region with ultraviolet light; A detection means for detecting the fluorescent material applied to the easy peeling region; A paper container substrate manufacturing system comprising: a removal means for removing the paper container substrate in which the fluorescent material is not detected in the easy-peel area by the detection means.

6. The paper container substrate manufacturing system of claim 5, wherein the removal means removes the paper container substrate in which the fluorescent material is detected in the easy-peel area by the detection means and in which the fluorescent material is also detected in areas other than the easy-peel area.

7. The paper container substrate manufacturing system according to claim 5, wherein the concentration of the fluorescent material in the release agent is 1 to 1000 ppm.

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