Laminate and laminate tube

Abstract

To provide a laminate which facilitates squeezing out when being used in a laminate tube, and a laminate tube using the laminate.SOLUTION: A laminate according to one embodiment is used in a body part of a laminate tube, and includes a first sealant layer, a second sealant layer, and a resin substrate layer disposed between the first sealant layer and the second sealant layer, wherein a product of a loop stiffness value (mN / 15 mm) in a TD direction of the laminate and a dead hold value (degree) in the TD direction is 70000 or less.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a laminate and a laminate tube. [Background technology]

[0002] Patent Document 1 discloses a laminated packaging tube material (laminate) having a base material, a pattern printed layer, and a printing primer layer laminated in that order, and having a sealant layer on the outermost surface on both sides of a laminate structure having a gas barrier layer, and a laminated tube using the same. For example, see Patent Document 1. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6167803 Summary of the Invention [Problem to be solved by the invention]

[0004] Laminated tubes are required to be easy to squeeze out when squeezing out the contents.

[0005] An object of one aspect of the present disclosure is to provide a laminate that can be easily squeezed when used in a laminate tube, and a laminate tube using the laminate. [Means for solving the problem]

[0006] [1] A laminate according to one aspect of the present disclosure is a laminate used in the trunk portion of a laminated tube, comprising a first sealant layer, a second sealant layer, and a resin substrate layer disposed between the first sealant layer and the second sealant layer, wherein the product of the loop stiffness value (mN / 15 mm) in the TD direction and the deadhold value (degrees) in the TD direction of the laminate is 70,000 or less.

[0007] In the laminate described in [1], the product of the loop stiffness value (mN / 15 mm) in the TD direction of the laminate and the dead hold value (degrees) in the TD direction of the laminate is not more than 70,000. When such a laminate is used to produce a laminate tube, the contents can be easily squeezed out of the laminate tube.

[0008] [2] In the laminate described in [1], the dead hold value may be the measurement result of the opening angle of a test piece corresponding to the laminate after folding it in half and compressing it at 0.2 MPa for 1 second, and then waiting 1 minute.

[0009] [3] In the laminate according to [1] or [2], the resin substrate layer may have a thickness of 20 μm or more and 80 μm or less, which allows the amount of resin used in the laminate to be reduced.

[0010] [4] In the laminate according to any one of [1] to [3], the laminate may have a light transmittance of 20% or less for light in a wavelength range of 400 nm or more and 800 nm or less. When such a laminate is used to produce a laminate tube, the contents can be more reliably concealed.

[0011] [5] In the laminate according to any one of [1] to [4], the brightness of the laminate may be equal to or greater than 92. When such a laminate is used to produce a laminate tube, a brighter color can be achieved.

[0012] [6] In the laminate according to any one of [1] to [5], the resin substrate layer may be a white polyethylene layer. When such a laminate is used to produce a laminate tube, the laminate tube can have a white body.

[0013] [7] In the laminate described in [1], the thickness of the resin substrate layer may be 20 μm or more and 80 μm or less, the light transmittance of the laminate for light in a wavelength range of 400 nm or more and 800 nm or less may be 20% or less, the brightness of the laminate may be 92 or more, and the resin substrate layer may be a white polyethylene layer. When a laminate tube is produced using such a laminate, it is possible to realize a laminate tube that has a white body, is easy to squeeze, and can ensure the concealment of the contents while reducing the amount of resin used.

[0014] [8] A laminated tube according to another aspect of the present disclosure comprises a body portion formed from the laminate described in any one of [1] to [7] and having a closed first end, and a cylindrical head portion connected to a second end portion of the body portion opposite the first end. [Effects of the Invention]

[0015] According to the present disclosure, it is possible to provide a laminate that can be easily squeezed when used in a laminate tube, and a laminate tube using the laminate. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 1 is a schematic front view of a laminate tube according to one embodiment. [Figure 2] FIG. 2 is a diagram illustrating an example of the layer structure of the laminate used in the body of the laminate tube shown in FIG. [Figure 3] FIG. 3 is a plan view of a test piece used to measure the deadhold value of a laminate. [Figure 4] FIG. 4 is a diagram for explaining a method for measuring the deadhold value of a laminate. [Figure 5] FIG. 5(a) is a drawing showing the layer structure of the laminate in Experimental Example 1, FIG. 5(b) is a drawing showing the layer structure of the laminate in Experimental Example 2, and FIG. 5(c) is a drawing showing the layer structure of the laminate in Experimental Example 3. [Figure 6]FIG. 6(a) is a drawing showing the layer structure of the laminate in Experimental Example 4, FIG. 6(b) is a drawing showing the layer structure of the laminate in Experimental Example 5, and FIG. 6(c) is a drawing showing the layer structure of the laminate in Experimental Examples 6 and 7. [Figure 7] FIG. 7 is a table showing the experimental results of Experimental Examples 1 to 7. [Figure 8] FIG. 8 is a table showing the experimental results of Experimental Examples 1 to 7. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The same elements are given the same reference numerals. Duplicate explanations will be omitted. The dimensional ratios of the drawings do not necessarily match those in the description.

[0018] FIG. 1 is a schematic front view of a laminated tube 1 according to this embodiment. The laminated tube 1 is a type of tube, a container that allows for easy squeezing of fluid contents and allows for any exterior design to be printed. The laminated tube 1 is a tube container that is widely used for storing semi-solid materials, such as food, toothpaste, medicine, cosmetics, paints, adhesives, etc. The laminated tube 1 is superior to metal tubes and the like in terms of elasticity and shape recovery. The laminated tube 1 comprises a body 2 and a head 3 joined to the body 2.

[0019] The body 2 is a cylindrical body with a closed first end 2a. The first end 2a is the bottom (opposite the head 3) of the laminated tube 1. The head 3 is joined to a second end 2b of the body 2. The second end 2b is the end opposite the first end 2a. The body 2 is formed by a laminate 10.

[0020] The body 2 is formed, for example, as follows: The sheet-like laminate 10 is rolled into a cylindrical shape so that one end of the laminate 10 overlaps the other end, and then the one end and the other end are heat-sealed to form a side seam, and the portion (bottom) corresponding to the first end 2a is also heat-sealed. In this way, the body 2 is formed.

[0021] The head 3 is a cylindrical body. A cylindrical cap (not shown) with a top is attached to the head 3. The head 3 may have an external thread (not shown) formed on its outer periphery that engages with the internal thread of the cap. The laminate tube 1 is configured to be sealed by attaching a cap to the head 3 (for example, the opening 3a).

[0022] The head 3 is made of a material that is highly compatible with the body 2 and does not affect the contents, and may be made of, for example, a thermoplastic resin. The head 3 is formed, for example, by compression molding. The head 3 is welded and joined to the body 2 by heat.

[0023] As shown in FIG. 1, the head 3 may have a cylindrical mouth 3a and a truncated cone-shaped shoulder 3b connecting the mouth 3a and the body 2. In a configuration in which the head 3 has the mouth 3a, the above-mentioned cylindrical cap with a top is attached to the mouth 3a. To attach the cap, the outer periphery of the mouth 3a may be formed with a male thread that engages with the female thread of the cap. Below, a configuration in which the head 3 has the mouth 3a and the shoulder 3b will be described.

[0024] Next, a description will be given of the laminate 10 that constitutes the trunk portion 2. Fig. 2 is a schematic diagram showing the layer structure of the laminate 10.

[0025] The laminate 10 includes a first sealant layer 11a, a resin substrate layer 12, and a second sealant layer 11b. The first sealant layer 11a, the resin substrate layer 12, and the second sealant layer 11b are laminated in this order.

[0026] The first sealant layer 11a and the second sealant layer 11b are layers that are heat-sealed to each other when constructing the body portion 2. The first sealant layer 11a is a layer that forms the outer surface of the body portion 2. The second sealant layer 11b is a layer that forms the inner surface of the body portion 2.

[0027] The first sealant layer 11a and the second sealant layer 11b are formed of resin (plastic). Examples of materials for the first sealant layer 11a and the second sealant layer 11b include polyethylene, polypropylene, polyester, etc. The first sealant layer 11a may contain, for example, an antistatic agent. The material for the first sealant layer 11a may be the same type of resin as that for the second sealant layer 11b.

[0028] The resin of the first sealant layer 11a may be different from the resin of the second sealant layer 11b as long as the welding strength with the second sealant layer 11b is 5N / 15mm or more. A welding strength of 5N / 15mm or more can further prevent peeling of the side seam portion during use of the laminated tube 1.

[0029] The resin of the second sealant layer 11b may be different from the resin of the first sealant layer 11a and the head 3, as long as the weld strength between the first sealant layer 11a and at least the portion of the head 3 on the body 2 side (e.g., shoulder portion 3b) is 5 N / 15 mm or more. As described above, a weld strength of 5 N / 15 mm or more can better prevent the side seam portion from peeling off during use of the laminated tube 1, and can also better prevent the head 3 from detaching.

[0030] The first sealant layer 11a and the second sealant layer 11b may each have a single-layer structure or a multi-layer structure. The first sealant layer 11a has a thickness of 20 μm or more and 150 μm or less. The second sealant layer 11b has a thickness of 20 μm or more and 150 μm or less.

[0031] The resin substrate layer 12 is a layer that imparts structural strength to the laminated tube 1 and contributes to maintaining the shape of the laminated tube 1. The resin substrate layer 12 also has the function of concealing the contents contained in the laminated tube 1. In this embodiment, the resin substrate layer 12 is a white polyethylene layer. The white polyethylene layer is formed, for example, by adding a white pigment to a polyethylene layer. An example of the white pigment is titanium oxide. The white polyethylene layer may be a layer in which at least titanium oxide is added to a polyethylene layer. Examples of white pigments include titanium oxide, zinc oxide, lithopone, white lead, etc. The amount of white pigment added is, for example, 5 wt% or more and 30 wt% or less.

[0032] Examples of polyethylene used for the resin substrate layer 12 include low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), medium-density polyethylene (MDPE), and high-density polyethylene (HDPE).

[0033] The thickness of the resin substrate layer 12 is, for example, 20 μm or more and 80 μm or less, and may be 30 μm or more, or 40 μm or more.

[0034] The laminate 10 satisfies the following condition 1. [Condition 1] The product of the loop stiffness value (mN / 15 mm) in the TD direction and the dead hold value (degrees) in the TD direction is 70,000 or less. The product of the loop stiffness value (mN / 15 mm) in the TD direction and the dead hold value (degrees) in the TD direction may be 50,000 or less, and more preferably 38,000 or less. An example of the lower limit of the product of the loop stiffness value (mN / 15 mm) in the TD direction and the dead hold value (degrees) in the TD direction is 10,000, or may be 20,000.

[0035] The TD direction in Condition 1 is the width direction of the laminate 10 and the laminate tube 1. The width direction of the laminate tube 1 is a direction substantially perpendicular to the side seam portion. In other words, the width direction of the laminate tube 1 is a direction substantially perpendicular to the longitudinal direction of the laminate tube 1 (the direction from the first end 2a to the second end 2b or from the second end 2b to the first end 2a).

[0036] The loop stiffness value under condition 1 may be a value measured under the following conditions using a loop stiffness measuring device on a test piece (width 15 mm) having the same configuration as the laminate 10. An example of the loop stiffness measuring device may be a Loop Stiffness Tester DA manufactured by Toyo Seiki Seisakusho, Ltd. Loop length: 100mm Push-in length: 10 mm Compression speed: 3.3mm / sec

[0037] The deadhold value in Condition 1 may be a value (measurement result) measured as follows.

[0038] First, as shown in FIG. 3, a rectangular test piece S having the same layer structure as the laminate 10 is prepared. The length (width) of the test piece S in the short side direction is 15 mm, and the length in the long side direction is 100 mm. The test piece S may be prepared by preparing a sheet having the same layer structure as the laminate 10 and then cutting the sheet. Alternatively, for example, when the laminate 10 is obtained by dividing a single sheet into multiple pieces, the test piece S may be obtained by cutting a portion of the single sheet. For ease of explanation, the two regions separated by the center line in the longitudinal direction of the test piece S will be referred to as region Sa and region Sb.

[0039] Next, as shown by the solid line in FIG. 4, the test piece S is folded in half with the surface of the second sealant layer 11b facing inward. In the test piece S folded in half, the area Sb overlaps the area Sa. The test piece S folded in half is compressed under the following conditions. Compression can be performed using, for example, a cup sealer plate. No heating is performed during compression. Compression pressure: 0.2 MPa Compression time: 1 second

[0040] As described above, the bent test piece S is compressed, and the opening angle θ of the test piece S is measured one minute later, and the measurement result is used as the dead hold value (degrees). The two-dot chain line in the opening diagram indicates the state in which the test piece S opens one minute after compression, and the area Sb separates from the area Sa.

[0041] The laminate 10 may have layers other than the first sealant layer 11a, the resin substrate layer 12, and the second sealant layer 11b as long as it satisfies condition 1. Layers other than the first sealant layer 11a, the resin substrate layer 12, and the second sealant layer 11b include a design layer (printed layer or ink layer), a barrier layer, a resin layer for bonding between layers, etc.

[0042] The barrier layer may be an inorganic compound layer provided on a resin layer (resin film) by a vapor deposition method. An example of the material of the resin layer of the barrier layer is polyethylene terephthalate (PET). An example of the material of the resin layer of the barrier layer may be the same as that of the resin substrate layer 12. Examples of the material of the inorganic compound layer include alumina, silicon oxide, etc. The barrier layer may also be a metal foil. Examples of the metal foil include aluminum foil, copper foil, etc.

[0043] When the laminate 10 has layers other than the first sealant layer 11a, the resin substrate layer 12, and the second sealant layer 11b, the thickness of the resin substrate layer 12 may be, for example, the thickest layer among the multiple layers arranged between the first sealant layer 11a and the second sealant layer 11b.

[0044] The laminate 10 may further satisfy at least one of the following conditions 2, 3, and 4. (Condition 2) The resin substrate layer 12 has a thickness of 80 μm or less. (Condition 3) The laminate 10 has a light transmittance of 20% or less for light in the wavelength range of 400 nm or more and 800 nm or less. (Condition 4) The lightness of the laminate (i.e., L *value) is 92 or greater.

[0045] The light transmittance in the above condition 3 may be a value measured by a spectrophotometer. An example of the spectrophotometer is the U-3900 manufactured by Hitachi High-Technologies Corporation. The brightness (L * The value) may be a value measured with a fluorescence spectrodensitometer. An example of the fluorescence spectrodensitometer is the FD-5 manufactured by Komica Minolta, Inc.

[0046] As described above, the laminate 10 satisfies the condition 1. This allows a user to easily squeeze out the contents when using the laminate tube 1 manufactured using the laminate 10.

[0047] When the laminate 10 satisfies condition 2, the amount of plastic used can be reduced while ensuring the effect of satisfying condition 1 in the laminate 10 and the laminate tube 1 using the laminate 10. This reduces the environmental load. In other words, environmental compatibility can be improved.

[0048] Instead of or in addition to condition 2, the laminate 10 may satisfy at least one of the following conditions 2a and 2b.

[0049] (Condition 2a) The ratio of the thickness of the resin substrate layer 12 to the thickness (total thickness) of the laminate 10 is 0.1 or more and 0.6 or less. That is, when the thickness of the laminate 10 is T1 [μm] and the thickness of the resin substrate layer 12 is T2 [μm], T2 / T1 is 0.1 or more and 0.6 or less.

[0050] (Condition 2b) The plastic weight (resin weight) in the laminate 10 is 150 g / m 2 or more and 250g / m 2 The following is the result.

[0051] When the laminate 10 satisfies at least one of condition 2a and condition 2b, the amount of plastic used can be reduced in the laminate 10 and the laminated tube 1 using the laminate 10, while ensuring the effect of satisfying condition 1, just as when the laminate 10 satisfies condition 2. This reduces the environmental load. In other words, environmental compatibility can be improved.

[0052] When the laminate 10 satisfies the condition 3, the laminate tube 1 using the laminate 10 can achieve high concealment of the contents while ensuring the effect when the condition 1 is satisfied.

[0053] When the laminate 10 satisfies the condition 4, the laminate tube 1 using the laminate 10 can have a bright appearance while ensuring the effect when the condition 1 is satisfied.

[0054] In a configuration in which conditions 2 to 4 are combined, i.e., in a configuration in which the laminate 10 satisfies two or more of conditions 2 to 4, the laminated tube 1 using the laminate 10 can obtain the effects of each of the combined conditions of conditions 2 to 4 while ensuring the effect of satisfying condition 1.

[0055] For example, if the laminate 10 satisfies condition 1 as well as conditions 2 to 4, it is possible to ensure that the contents of the laminated tube 1 using the laminate 10 can be easily squeezed out, and it is possible to achieve a bright white appearance while improving environmental suitability and content concealment.

[0056] When the whiteness of a content is achieved by using the content, such as toothpaste, a bright white appearance of the laminated tube improves the product image. To achieve a white color in a laminated tube, one option is to add a white pigment to the resin substrate layer to create a white resin substrate layer. On the other hand, a certain level of content concealment is also required for laminated tubes. To ensure sufficient concealment and whiteness using a white resin substrate layer, one option is to thicken the resin substrate layer (e.g., 100 μm or more). However, thickening the resin substrate layer increases the amount of resin (amount of plastic) used in the laminate, and the tube becomes too stiff in actual use, making it difficult to squeeze out the content.

[0057] In contrast, if the laminate 10 satisfies conditions 2 to 4 in addition to condition 1, as described above, it is possible to ensure ease of squeezing out the contents from the laminated tube 1 using the laminate 10, and it is possible to achieve a bright white appearance while improving environmental suitability and content concealment.

[0058] The effect when the laminate 10 satisfies at least one of the conditions 2a and 2b is similar to the effect when the laminate 10 satisfies the condition 2.

[0059] Although the resin substrate layer 12 has been described as being white, the resin substrate layer 12 may have another color. When the resin substrate layer 12 has another color, it is sufficient that a pigment corresponding to the color of the resin substrate layer 12 is added to the resin substrate layer 12. The resin used for the resin substrate layer 12 is not limited to polyethylene.

[0060] Next, an experimental example will be described.

[0061] (Experimental Example 1) In Experimental Example 1, a laminate 20A having the layer structure shown in Fig. 5(a) was prepared. The laminate 20A had an LLDPE layer 21a, a white PE layer 22, and an LLDPE layer 21b.

[0062] The LLDPE layer 21a was a layer corresponding to the first sealant layer 11a (see FIG. 2) in the laminate 20A. The LLDPE layer 21A was a layer formed from LLDPE and had a thickness of 35 μm.

[0063] The white PE layer 22 was a layer corresponding to the resin substrate layer 12 (see FIG. 2) in the laminate 20A. The white PE layer 22 was a layer formed from white PE and was a white layer with a thickness of 80 μm. The white PE layer 22 contained titanium oxide as a white pigment.

[0064] The LLDPE layer 21b was a layer corresponding to the second sealant layer 11b (see FIG. 2) in the laminate 20A. The LLDPE layer 21b was made of LLDPE and had a thickness of 80 μm.

[0065] The LLDPE layer 21a and the white PE layer 22 were laminated by extruding PE by extruder lamination, and a 15 μm thick PE layer 25a was disposed between the LLDPE layer 21a and the white PE layer 22.

[0066] A barrier layer 23 and a PET layer 24 made of PET were laminated on the LLDPE layer 21b. The barrier layer 23 was a transparent vapor-deposited PET film (GL-ARH-F manufactured by TOPPAN Corporation) with a thickness of 12 μm. The PET layer 24 was 12 μm thick. The LLDPE layer 21b and the barrier layer 23 were bonded together by an adhesive layer. The barrier layer 23 and the PET layer 24 were also bonded together by an adhesive layer. The adhesive layer used was formed from a two-component curing urethane-based dry laminating adhesive.

[0067] The resin substrate layer 12 and the PET layer 24 were laminated by extruding PE by extruder lamination, and a 15 μm thick PE layer 25b was disposed between the white PE layer 22 and the PET layer.

[0068] (Plastic weight) In Experimental Example 1, the weight of plastic in the laminate 20A was calculated. The calculated weight of plastic was as shown in the table in FIG.

[0069] FIG. 7 is a table showing the experimental results of Experimental Examples 1 to 7. "No." in FIG. 7 indicates the number of the Experimental Example. FIG. 7 also illustrates the layer structure and the layer thickness of the laminate. In the layer structure shown in FIG. 7, "first LLDPE," "second LLDPE," "first PE," "second PE," "first WPE," "second WPE," "GLPET," "PET," and "ink" indicate the layers of the laminate in Experimental Examples 1 to 7, and their meanings are as follows, as described in the remarks column of FIG. 7. First LLDPE: LLDPE layer 21a (see Figures 5(a) to (c) and Figures 6(a) to (c)) Second LLDPE: LLDPE layer 21b (see Figures 5(a) to (c) and Figures 6(a) to (c)) First PE: PE layer 25a (see FIGS. 5(a) to 5(c) and 6(a) to 6(c)) Second PE: PE layer 25b (see FIGS. 5(a) to 5(c) and 6(a) to 6(c)) First WPE: White PE layer 22 (see Figures 5(a) to (c)) Second WPE: White PE layer 31 (see Figures 6(a) to (c)) GLPET: Barrier layer 23 (see Figures 5(a)-(c) and Figures 6(a)-(c)) PET:PET layer 24 (see Figures 5(a), 6(b), and 6(c)) Ink: Ink layer 32 (see Figures 6(b) and 6(c))

[0070] In the layer structure shown in Figure 7, the numbers in parentheses indicate the thickness (μm) of the corresponding layer. Thus, "first LLDPE (35)" refers to the 35 μm-thick LLDPE layer 21a, and "first WPE (80)" refers to the 80 μm-thick white PE layer 22. In the layer structure shown in Figure 7, the symbol " / " indicates the boundary between two layers, and the symbol " / / " indicates that the layers on both sides are joined by an adhesive layer.

[0071] (Light transmittance) The light transmittance of the laminate 20A for light in the wavelength range of 400 nm or more and 800 nm or less was measured using a U-3900 manufactured by Hitachi High-Technologies Corporation. The measurement results for wavelengths of 400 nm, 500 nm, 600 nm, 700 nm, and 800 nm were as shown in the table shown in Figure 8. Figure 8 is a table showing the experimental results for Experimental Examples 1 to 7. "No." in Figure 8 indicates the number of the Experimental Example.

[0072] (Lightness (L * value)) The laminate 20A was placed on a calibration plate (FD-A06 manufactured by Komica Minolta, Inc.), and the brightness was measured using a fluorescence spectrodensitometer (FD-5 manufactured by Komica Minolta, Inc.) The measurement results were as shown in the table in FIG.

[0073] (Loop stiffness and deadhold values) The loop stiffness value α (mN / 15 mm) of a test piece (width 15 mm) having the same configuration as the laminate 20A was measured under the following conditions using a loop stiffness tester DA manufactured by Toyo Seiki Seisakusho, Ltd. The measurement results are shown in the table in FIG. Loop length: 100mm Push-in length: 10 mm Compression speed: 3.3mm / sec

[0074] The test piece S in the method for measuring the deadhold value described in Figures 3 and 4 was a test piece having the same configuration as the laminate 20A, and the deadhold value β (degrees) of the laminate 20A was measured using the method for measuring the deadhold value described in Figures 3 and 4.

[0075] Specifically, a test piece S (size: 15 mm × 100 mm) having the same layer structure as the laminate 20A was prepared, folded in half, and compressed (0.2 MPa, 1 second) using a cup sealer plate without heating. After 1 minute, the opening angle θ (degrees) shown in Fig. 4 was measured and used as the dead hold value β. The measured dead hold value β was as shown in the table in Fig. 8.

[0076] The product of the loop stiffness value α and the dead hold value β measured for the laminate 20A was calculated. The calculation results (α×β) were as shown in the table in FIG.

[0077] A laminate tube corresponding to the laminate tube 1 shown in FIG. 1 was produced using the laminate 20A, and toothpaste was filled into the tube to evaluate the hiding power and ease of squeezing.

[0078] (Concealment) Twenty people looked at the laminated tube filled with toothpaste and evaluated whether the toothpaste was visible. Based on the evaluation results of the 20 people, the hiding power of the laminated body 20A was evaluated using the following criteria of A+, A, and B. The evaluation results are shown in the table in FIG. 8. Rating A+: 18 or more people rated that toothpaste was not visible. Rating A: 15 or more and 17 or less people rated that the toothpaste was not visible. Rating B: Less than 15 people rated that the toothpaste was not visible.

[0079] (Easy to squeeze out) Twenty people were asked to squeeze toothpaste from the laminated tubes filled with toothpaste, and the ease of squeezing was evaluated. Based on the evaluation results of the 20 people, the hiding power of the laminated body 20A was evaluated using the following criteria of A+, A, and B. The evaluation results are shown in the table in FIG. 8. Rating A+: 18 or more people felt it was easy to squeeze out. Rating A: 15 or more and 17 or less people felt that it was easy to squeeze out. Rating B: Less than 15 people felt that it was easy to squeeze out.

[0080] (Experimental Example 2) In Experimental Example 2, a laminate 20B having the layer structure shown in FIG. 5(b) was prepared. The laminate 20B was The thickness of the PE layer 25a is 25 μm. The thickness of the PE layer 25b is 20 μm. The thickness of the white PE layer 22 is 70 μm, and The absence of the PET layer 24; Other than that, the laminate was the same as the laminate 20A of Experimental Example 1.

[0081] Except for using laminate 20B instead of laminate 20A, the weight of plastic in laminate 20B was calculated in the same manner as in Experimental Example 1. The calculated weight of plastic was as shown in the table in FIG.

[0082] The light transmittance and brightness (L * The loop stiffness value α and the dead hold value β were measured, and the product (α×β) of the loop stiffness value α and the dead hold value β was calculated. * The measurement results of the loop stiffness value α and the deadhold value β, as well as the product (α×β), are shown in the table in FIG.

[0083] Except for the fact that laminated tubes corresponding to laminated tube 1 shown in FIG. 1 were produced using laminated body 20B instead of laminated body 20A, the hiding power and squeezability were evaluated in the same manner as in Experimental Example 1. The evaluation criteria were the same as in Experimental Example 1. The evaluation results are shown in the table in FIG. 8.

[0084] (Experimental Example 3) In Experimental Example 3, a laminate 20C having the layer structure shown in FIG. 5(c) was prepared. The absence of the LLDPE layer 21a The thickness of the PE layer 25a is 30 μm, and The absence of the PET layer 24; Other than that, the laminate was the same as the laminate 20A of Experimental Example 1.

[0085] In Experimental Example 3, the PE layer 25a was a layer formed by extruding PE by extruder lamination on the white PE layer 22. In the laminate 20C, the PE layer 25a was a layer corresponding to the first sealant layer 11a (see FIG. 2).

[0086] Except for using laminate 20C instead of laminate 20A, the weight of plastic in laminate 20C was calculated in the same manner as in Experimental Example 1. The calculated weight of plastic was as shown in the table in FIG.

[0087] The light transmittance and brightness (L * The loop stiffness value α and the dead hold value β were measured, and the product (α×β) of the loop stiffness value α and the dead hold value β was calculated. * The measurement results of the loop stiffness value α and the deadhold value β, as well as the product (α×β), are shown in the table in FIG.

[0088] Except for the fact that laminated tubes corresponding to laminated tube 1 shown in FIG. 1 were produced using laminated body 20C instead of laminated body 20A, the hiding power and ease of squeezing were evaluated in the same manner as in Experimental Example 1. The evaluation criteria were the same as in Experimental Example 1. The evaluation results are shown in the table in FIG. 8.

[0089] (Experimental Example 4) In Experimental Example 4, a laminate 20D having the layer structure shown in FIG. 6(a) was prepared. The laminate 20D is The thickness of the LLDPE layer 21a is 40 μm. The thickness of the PE layer 25a is 20 μm. The white PE layer 31 is used instead of the white PE layer 22. The absence of the PET layer 24, and The thickness of the PE layer 25b is 18 μm. Other than that, the laminate was the same as the laminate 20A of Experimental Example 1.

[0090] The white PE layer 31 was a PE layer having a thinner whiteness than the white PE layer 22 (having a smaller amount of titanium oxide added than the white PE layer 22). The thickness of the white PE layer 31 was 140 μm.

[0091] Except for using laminate 20D instead of laminate 20A, the weight of plastic in laminate 20D was calculated in the same manner as in Experimental Example 1. The calculated weight of plastic was as shown in the table in FIG.

[0092] The light transmittance and brightness (L * The loop stiffness value α and the dead hold value β were measured, and the product (α×β) of the loop stiffness value α and the dead hold value β was calculated. * The measurement results of the loop stiffness value α and the deadhold value β, as well as the product (α×β), are shown in the table in FIG.

[0093] Except for the fact that laminated tubes corresponding to laminated tube 1 shown in FIG. 1 were produced using laminated body 20D instead of laminated body 20A, the hiding power and squeezability were evaluated in the same manner as in Experimental Example 1. The evaluation criteria were the same as in Experimental Example 1. The evaluation results are shown in FIG. 8.

[0094] (Experimental Example 5) In Experimental Example 5, a laminate 20E having the layer structure shown in FIG. 6(b) was prepared. Laminate 20E was the same as laminate 20A of Experimental Example 1, except that white PE layer 31 was used instead of white PE layer 22. White PE layer 31 was the same as white PE layer 31 of Experimental Example 4, except that its thickness was 80 μm.

[0095] Except for using laminate 20E instead of laminate 20A, the weight of plastic in laminate 20D was calculated in the same manner as in Experimental Example 1. The calculated weight of plastic was as shown in the table in FIG.

[0096] The light transmittance and brightness (L * The loop stiffness value α and the dead hold value β were measured, and the product (α×β) of the loop stiffness value α and the dead hold value β was calculated. * The measurement results of the loop stiffness value α and the deadhold value β, as well as the product (α×β), are shown in the table in FIG.

[0097] Except for the fact that laminated tubes corresponding to laminated tube 1 shown in FIG. 1 were produced using laminated body 20E instead of laminated body 20A, the hiding power and ease of squeezing were evaluated in the same manner as in Experimental Example 1. The evaluation criteria were the same as in Experimental Example 1. The evaluation results are shown in the table in FIG. 8.

[0098] (Experimental Example 6) In Experimental Example 6, a laminate 20F having the layer structure shown in FIG. 6(c) was prepared. The laminate 20F is The white PE layer 31 is used instead of the white PE layer 22, and an ink layer 42 having light-blocking properties is disposed between the PET layer 24 and the barrier layer 23; Other than that, the laminate was the same as the laminate 20A of Experimental Example 1. The white PE layer 31 was a white PE layer having a thickness of 80 μm, the same as in Experimental Example 5. The ink layer 42 was a layer formed by two-color printing using white ink and sepia ink.

[0099] Except for using laminate 20F instead of laminate 20A, the weight of plastic in laminate 20F was calculated in the same manner as in Experimental Example 1. The calculated weight of plastic was as shown in the table in FIG.

[0100] The light transmittance and brightness (L * The loop stiffness value α and the dead hold value β were measured, and the product (α×β) of the loop stiffness value α and the dead hold value β was calculated. * The measurement results of the loop stiffness value α and the deadhold value β, as well as the product (α×β), are shown in the table in FIG.

[0101] Except for the fact that laminated tubes corresponding to laminated tube 1 shown in FIG. 1 were produced using laminated body 20F instead of laminated body 20A, the hiding power and ease of squeezing were evaluated in the same manner as in Experimental Example 1. The evaluation criteria were the same as in Experimental Example 1. The evaluation results are shown in the table in FIG. 8.

[0102] (Experimental Example 7) In Experimental Example 7, a laminate was prepared that was the same as the laminate in Experimental Example 6, except that the thickness of the white PE layer 31 was 50 μm. For ease of explanation, the laminate in Experimental Example 7 is referred to as laminate 20G (see FIG. 6(c)).

[0103] Except for using laminate 20G instead of laminate 20A, the weight of plastic in laminate 20G was calculated in the same manner as in Experimental Example 1. The calculated weight of plastic was as shown in the table in FIG.

[0104] The light transmittance and brightness (L * The loop stiffness value α and the dead hold value β were measured, and the product (α×β) of the loop stiffness value α and the dead hold value β was calculated. * The measurement results of the loop stiffness value α and the deadhold value β, as well as the product (α×β), are shown in the table in FIG.

[0105] Except for the fact that laminate tubes corresponding to laminate tube 1 shown in FIG. 1 were produced using laminate 20G instead of laminate 20A, the hiding power and ease of squeezing were evaluated in the same manner as in Experimental Example 1. The evaluation criteria were the same as in Experimental Example 1. The evaluation results are shown in the table in FIG. 8.

[0106] (Experimental results of Experimental Examples 1 to 7) As shown in Figure 8, in Experimental Example 4, where the product (α × β) of the loop stiffness value α and the dead-hold value β exceeded 70,000, the ease of squeezing was rated B. In Experimental Examples 1 to 3 and 5 to 7, where the product (α × β) of the loop stiffness value α and the dead-hold value β was 70,000 or less, the ease of squeezing was rated A or A+. From this, it can be seen that when the product (α × β) of the loop stiffness value α and the dead-hold value β is 70,000 or less, it is possible to realize a laminated tube that is easy to squeezable. In other words, usability can be improved by manufacturing a laminated tube using a laminate whose product (α × β) is 70,000 or less (a laminated body that satisfies condition 1).

[0107] In Experimental Examples 1 to 3 and 7, the product (α×β) of the loop stiffness value α and the dead hold value β was 40,000 or less, and the evaluation of ease of squeezing was A+. Therefore, by using a laminate whose product (α×β) is 40,000 or less, it is possible to realize a laminate tube that is easier to squeeze.

[0108] In Experimental Example 4, as shown in FIG. 7, the thickness of the white PE layer 31 corresponding to the resin substrate layer in the laminate 20D was 120 μm, and the plastic weight was 290.58 g / m 2 In Experimental Examples 1 to 3, 5 to 7, the thickness of the white PE layer 22 or the white PE layer 31 corresponding to the resin substrate layer in each of the laminates 20A to 20C, 20E to 20G was 80 μm or less, and the plastic weight was 240.30 g / m 2Therefore, it can be seen that by making the thickness of the white PE layers 22, 31 80 μm or less (satisfying condition 2), it is possible to reduce the amount of plastic used in the laminate to form the laminated tube. A laminate with reduced plastic usage and a laminated tube using the same contribute to reducing the environmental impact.

[0109] As shown in FIG. 8, the laminate 20E of Experimental Example 5 sometimes had a light transmittance of more than 20% for light in the wavelength range of 400 nm or more and 800 nm or less. The concealing ability for the laminate 20E was rated B. The laminates 20A to 20D, 20F, and 20G of Experimental Examples 1 to 4 and 6 to 7 had a light transmittance of 20% or less. The concealing ability for the laminates 20A to 20D, 20F, and 20G was rated A+. This demonstrates that the concealing ability for the contents can be improved by producing a laminate tube using a laminate having a light transmittance of 20% or less for light in the wavelength range of 400 nm or more and 800 nm or less (a laminate satisfying condition 3).

[0110] The laminates 20F and 20G of Experimental Examples 6 and 7 also had a white color because they contained a white PE layer 31. However, the laminates 20F and 20G appeared darker than the laminates 20A to 20E. In fact, the lightness (L* value) of the laminates 20F and 20G was less than 92. This is thought to be due to the use of the light-blocking ink layer 32 to reduce light transmittance. In particular, the laminate 20G appeared darker and had a lower lightness than the laminate 20F because the white PE layer 31 was thinner than the laminate 20F. The laminates 20A to 20E were able to achieve a white color brighter than the laminates 20F and 20G, and also maintained a lightness of 92 or higher. This demonstrates that a bright white color can be achieved in a laminate containing a white PE layer when the lightness is 92 or higher (when Condition 4 is satisfied). Since the laminates 20A to 20G use white PE layers, the results are based on the brightness of white, but it can be understood that the same applies when PE layers of other colors are used.

[0111] As can be seen from the diagrams shown in Figures 7 and 8, the laminates 20A to 20C of Experimental Examples 1 to 3 were laminates that satisfied conditions 1 to 4. In this way, it can be seen that by the laminates for laminate tubes satisfying conditions 1 to 4, it is possible to reduce the amount of plastic used, while improving the ease of squeezing the contents and the concealment of the contents in laminate tubes using each of the laminates, and also achieving a bright color (white in the experimental examples) in appearance.

[0112] Although the embodiments and experimental examples of the present invention have been described above, the present invention is not limited to the above embodiments and experimental examples. The present invention is intended to include all modifications within the scope indicated by the claims and within the meaning and scope equivalent to the claims. [Explanation of symbols]

[0113] 1...Laminated tube, 2...Body portion, 2a...First end portion, 2b...Second end portion, 3...Head portion, 10, 20A, 20B, 20C, 20D, 20E, 20F, 20G...Laminated body, 11a...First sealant layer, 11b...Second sealant layer, 12...Resin substrate layer, S...Test piece.

Claims

1. A laminate used in a laminate tube, a first sealant layer; a second sealant layer; and a resin substrate layer disposed between the first sealant layer and the second sealant layer; Equipped with The product of the loop stiffness value (mN / 15 mm) in the TD direction of the laminate and the dead hold value (degrees) in the TD direction is 70,000 or less. Laminate.

2. The dead hold value is a measurement result of the opening angle of a test piece corresponding to the laminate after folding it in half and compressing it at 0.2 MPa for 1 second, and then 1 minute later. The laminate according to claim 1 .

3. The thickness of the resin substrate layer is 20 μm or more and 80 μm or less. The laminate according to claim 1 .

4. The laminate has a light transmittance of 20% or less for light in a wavelength range of 400 nm or more and 800 nm or less. The laminate according to claim 1 .

5. The brightness of the laminate is 92 or more. The laminate according to claim 1 .

6. The resin substrate layer is a white polyethylene layer. The laminate according to claim 1 .

7. The thickness of the resin substrate layer is 20 μm or more and 80 μm or less, The laminate has a light transmittance of 20% or less for light in a wavelength range of 400 nm or more and 800 nm or less, The brightness of the laminate is 92 or more, The resin substrate layer is a white polyethylene layer. The laminate according to claim 1 .

8. a body portion formed by the laminate according to any one of claims 1 to 4, the body portion having a closed first end; a cylindrical head portion connected to a second end portion of the body portion opposite to the first end portion; Equipped with Laminated tube.

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