JP6207316B2 - Tube laminate and tube container - Google Patents

Description

  The present invention relates to a laminate for forming a tube container.

  In recent years, a hot air seal method, a high frequency seal method, and an ultrasonic seal method have been adopted when sealing a tube laminate to form the bottom of a tube container.

  In particular, in the ultrasonic sealing method, two sealed objects are clamped together by a horn as a vibrator and an anvil as a fixed part, and the horn is vibrated ultrasonically to generate frictional heat at the interface between the two adherends. In order to repel the contents contaminated in the planned seal part at the time of sealing, it is excellent in the sealing performance of the contaminants, as well as the sealing strength as well as the stability of the finished product and the productivity. It is an excellent method.

  Along with the adoption of the ultrasonic sealing method, a tube laminate suitable for the ultrasonic sealing method has also been developed. Moreover, in order to protect the contents of a tube, the laminated body for tubes containing a barrier layer is desired.

  For example, in Patent Document 1, a barrier layer such as an aluminum foil layer may be provided inside the outer layer of a laminated film for tubes to which ultrasonic sealing is applied, and the thickness of the aluminum foil layer is about 5 μm to about 30 μm. It is described that.

  In Patent Document 2, in order to improve the welding speed between a plurality of resin layers at the time of ultrasonic sealing, since the lubricity between the interfaces of the resin layers is important, a lubricant is added to the welded portion of the resin layer. It is described that it is adhered by an adhesion method such as coating, spreading, dipping or the like.

  Patent Document 3 describes a device for applying a lubricant when sealing the bottom portion of a tube container and an ultrasonic sealing device for welding the bottom seal portion to which the lubricant is applied by frictional heat generated by ultrasonic vibration. ing.

International Publication No. 2003/099557 JP 62-297138 A Japanese Utility Model Publication No. 4-126775

  However, when the tube laminate including the aluminum foil layer is ultrasonically sealed, cracks are likely to occur in the aluminum foil layer. In particular, cracks in the aluminum foil layer are noticeably generated when the tube laminate is ultrasonically sealed to form the bottom of the tube container.

  Conventionally, sufficient studies have not been made on techniques for preventing cracks in the aluminum foil layer during ultrasonic sealing.

  Moreover, even if a lubricant is separately attached to the sealed portion of the tube laminate, it is unclear whether the aluminum foil layer can be prevented from cracking. Furthermore, in order to attach the lubricant to the sealed part, it is expected that the manufacturing process will increase, the introduction of a dedicated machine for attaching the lubricant, the selection of the attachment conditions, etc. Container productivity is sacrificed.

  Therefore, the present invention provides an aluminum layer only with a tube laminate without relying on external means such as attachment of a lubricant when performing ultrasonic sealing to form the bottom of a tube container having an aluminum layer. It aims at providing the laminated body for tubes which can suppress a crack.

The present inventors can solve the above-mentioned problems by specifying the position of the aluminum foil layer in the tube laminate and controlling the coefficient of dynamic friction between the inner surfaces of the tube laminate within a specific range. As a result, the present invention has been completed. That is, the present invention is as follows.
[1] A laminate for a tube in which an outer layer, an aluminum foil layer, and an inner layer are sequentially laminated,
The outer layer forms the outer surface of the tube laminate,
The inner layer forms the inner surface of the tube laminate,
The total value of the thickness of the outer layer and the thickness of the aluminum foil layer is not more than the thickness of the inner layer, and the coefficient of dynamic friction between the inner surfaces is 0.1 or more and less than 0.6,
Laminate for tube.
[2] The tube laminate according to [1], wherein a total value of the thickness of the outer layer and the thickness of the aluminum foil layer is 0.8 times or less of the thickness of the inner layer.
[3] The tube laminate according to [2], wherein a total value of the thickness of the outer layer and the thickness of the aluminum foil layer is 0.7 times or less of the thickness of the inner layer.
[4] The laminated body for a tube according to any one of [1] to [3], wherein the dynamic friction coefficient is 0.1 or more and 0.5 or less.
[5] The tube laminate according to [4], wherein the dynamic friction coefficient is 0.2 or more and 0.5 or less.
[6] The laminate for a tube according to any one of [1] to [5], wherein the inner surface is formed of a lubricant-containing film.
[7] The laminated body for a tube according to [6], wherein the lubricant-containing film includes an inorganic lubricant, an organic lubricant, or a mixture thereof.
[8] The tube laminate according to any one of [1] to [7], wherein the inner surface has a surface roughness (Rz) of 1.3 μm or more and 6.3 μm or less.
[9] A tube container having a bottom seal portion formed of the tube laminate according to any one of [1] to [8].
[10] The tube container according to [9], wherein the bottom seal portion is formed by ultrasonic sealing.
[11] The tube container according to [10], wherein the ultrasonic seal is a transverse vibration ultrasonic seal.

  According to the present invention, the aluminum foil layer is closer to the outer surface side than the sealed surface (that is, the inner surface) side of the laminated body for a tube, so that cracks are suppressed by avoiding stress concentration on the aluminum foil layer during ultrasonic sealing. In addition, the metallic gloss when the laminate for a tube is observed from the outer surface side can also be improved.

  In addition, according to the present invention, the inner surface of the tube laminate has lubricity suitable for ultrasonic sealing, so that the stress applied to the aluminum foil is relieved to suppress cracks, and the conventional tube laminate and A butt seal strength comparable or superior to conventional tube laminates can be achieved.

  Furthermore, according to the present invention, the lubricity of the inner surface can be ensured only with the tube laminate, so there is no need to add a lubricant to the sealed portion. Therefore, the appearance defect of the tube laminate due to the scattering of the lubricant can be prevented, and the maintainability of the ultrasonic sealing device can be improved.

FIG. 1 is a schematic cross-sectional view of a laminated body for a tube according to an embodiment of the present invention. FIG. 2 is a schematic diagram showing the vibration direction of ultrasonic waves when ultrasonically sealing the inner surfaces of the tube laminate. FIG. 3 is a schematic diagram for explaining the stress applied to the tube laminate during ultrasonic sealing. FIG. 4 is a graph showing the relationship between the dynamic friction coefficient between the inner surfaces, the position of the aluminum foil layer in the tube laminate, and the state of the aluminum foil layer after ultrasonic sealing in Examples and Comparative Examples. . FIG. 5A is a photograph of an ultrasonic seal portion of the tube laminate obtained in Example 1, and FIG. 5B is a view of the tube laminate obtained in Comparative Example 1. It is the photograph which imaged the ultrasonic seal part.

<Constituent elements of tube laminate>
The laminated body for tubes of the present invention includes a layer configuration of “outer layer, aluminum foil layer and inner layer”. As FIG. 1 shows, an outer layer (2), an aluminum foil layer (3), and an inner layer (4) are laminated | stacked in order toward the inner surface (6) from the outer surface (5) of the laminated body (1) for tubes. Yes.

  Hereinafter, the “outer layer”, “aluminum foil layer”, and “inner layer”, which are components of the tube laminate, will be described.

[Outer layer]
The outer layer is the outermost layer when a tube is formed from the tube laminate. The outer layer has an outer surface that faces outward when the tube is formed.

  When the tube laminate is rolled so that the inner layer is inside, the ends of the laminate are overlaid and sealed to form the tube body, the outer and inner surfaces of the laminate are generally heated. Since it is sealed, the outer surface is preferably formed of polyolefin from the viewpoint of low-temperature sealability. Examples of the polyolefin include polyethylene and polypropylene. The outer surface can also be formed using polyethylene and a resin other than polyethylene.

  The outer surface is more preferably formed of polyethylene, and further preferably a polyethylene film. Examples of polyethylene include low density polyethylene (LDPE), linear low density polyethylene (LLDPE), medium density polyethylene (MDPE), and high density polyethylene (HDPE). These may be used alone or in combination. Among these, LLDPE is preferable from the viewpoint of low-temperature sealability.

  In addition to the outer surface, the outer layer may include a layer such as a resin layer other than polyolefin, an adhesive layer, a metal foil layer other than aluminum foil, and an inorganic deposited film.

  The thickness of the outer layer is preferably about 30 μm or more, about 50 μm or more, about 75 μm or more, or about 100 μm or more in order to maintain the pressure resistance as a tube container.

[Aluminum foil layer]
The aluminum foil layer is a layer formed of an aluminum foil. The aluminum foil is a foil containing aluminum.

  The aluminum foil may contain a metal other than aluminum, and may be formed of an alloy of aluminum and another metal.

  The thickness of the aluminum foil layer is not particularly limited, but is preferably 7 μm or more or 10 μm or more from the viewpoint of cost for forming the aluminum foil layer, and the thickness is 40 μm or less. Or it is preferable that it is 30 micrometers or less.

[Inner layer]
The inner layer is a layer that becomes the innermost layer when a tube is formed from the laminate for a tube. The inner layer has an inner surface that faces the inner side or the content side when the tube is formed.

  Generally, when forming the bottom part of a tube container, since the laminated body for tubes is formed in a cylindrical shape or is bent, the inner surfaces face each other and are sealed. In that case, the inner surface corresponds to the seal interface when sealing the bottom of the tube, and the layer having the inner surface is called a sealant layer.

  The dynamic friction coefficient between the inner surfaces used in the present invention is 0.1 or more, 0.2 or more, or 0.3 or more, and the dynamic friction coefficient is less than 0.6, 0.5 or less, or 0. .4 or less. When the dynamic friction coefficient is 0.1 or more, frictional heat necessary for sealing the inner surfaces can be applied to the interface between the inner surfaces. On the other hand, if this dynamic friction coefficient is less than 0.6, the inner surface can have sufficient lubricity to relieve the stress applied to the aluminum foil layer during ultrasonic sealing. Therefore, since the inner surface can achieve both friction and lubricity, the laminated body for a tube of the present invention can maintain the sealing strength of the bottom portion and suppress cracks in the aluminum foil layer.

  When measuring the dynamic friction coefficient between the inner surfaces, for example, the tube laminate is bent and the inner surfaces are rubbed together, or two same tube laminates are prepared and the inner surfaces are rubbed together. Also good.

For example, as shown in FIG. 2, two inner tubes for laminate (4,4) Te oppositely, each of inner surfaces (6,6) with each other by rubbing along the direction x _1, the inner surface ( 6, 6) The dynamic friction coefficient between them may be measured. In that case, the inner surface (6) is regarded as a seal interface during butt seal, also the direction x ₁ is considered as a horizontal vibration direction of the ultrasonic sealing.

Moreover, the measurement of a dynamic friction coefficient can be performed using a commercially available friction coefficient measuring device according to JISK7125, for example. Specifically, for example, two inner surfaces are brought into plane contact with each other, and one inner surface is moved relative to the other inner surface under a uniform contact pressure, so that a dynamic friction force (F _D ) and a method are obtained. Record the line force ( _FP ). In that case, the dynamic friction coefficient (μ _D ) can be calculated according to the formula “μ _D = F _D / F _P ”.

  Examples of means for adjusting the coefficient of dynamic friction between the inner surfaces to 0.1 or more and less than 0.6 include chemical means for selecting the material of the inner surface, physical means for controlling the surface state of the inner surface, and the like. .

  Regarding chemical means, it is preferable to use a lubricant-containing film as the inner surface of the inner layer (that is, the sealant layer of the tube laminate). The use of a lubricant-containing film not only provides sufficient lubricity to the inner surface of the tube laminate to relieve stress on the aluminum foil layer during ultrasonic sealing, but also attaches the lubricant to the seal interface. In addition, the amount of use or scattering of the lubricant can be reduced, and the appearance and maintainability of the tube laminate can be improved.

  The lubricant may be, for example, an inorganic lubricant, an organic lubricant, a mixture of an inorganic lubricant and an organic lubricant, a lubricant in which the surface of the inorganic lubricant is coated with an organic lubricant, or a lubricant in which the surface of the organic lubricant is coated with an inorganic lubricant.

  Examples of the inorganic lubricant include clay, talc, calcium carbonate, zinc carbonate, wollastonite, silica, alumina, magnesium oxide, calcium silicate, sodium aluminate, calcium aluminate, magnesium aluminosilicate, glass balloon, carbon black, Zinc oxide, antimony trioxide, zeolite, hydrotalcite and the like can be mentioned. Among these, silica or zeolite is preferable.

  Examples of the organic lubricant include natural wax such as vegetable oil, polyethylene wax, silicone, paraffin wax, fatty acid, fatty acid amide, fatty acid ester, and fatty acid metal salt.

  Further, the lubricant may be in the form of particles, granules, spheres, plates or the like.

  On the other hand, as a physical means, for example, when forming the inner surface (that is, the sealant layer) of the tube laminate, the surface roughness of the inner surface is 1.3 μm or more, 1.8 μm or more, 2.0 μm or more. Alternatively, it is preferably adjusted to 2.2 μm or more and 6.3 μm or less, 4.8 μm or less, 4.4 μm or less, or 3.2 μm or less. The surface roughness is the maximum height (Rz) of the roughness curve.

  For example, when supplying an inner surface forming material such as a resin composition for a sealant layer from a T-die between a laminate roll and a pressure roll, a surface finish roll such as a mat finish roll or a semi-matt finish roll is used as the pressure roll. By using it, the surface roughness of the inner surface can be adjusted to 1.3 μm to 6.3 μm. At that time, the pressure roll may be a cooling roll or a heating roll. Further, the surface roughness of the inner surface may be adjusted to 1.3 μm to 6.3 μm by sandblasting treatment, corona treatment or embossing of the inner surface.

  When a surface finish roll is used, there is no need to add a lubricant to the seal interface or to prepare a lubricant-containing film, so the dynamic friction coefficient between the inner surfaces is adjusted to 0.1 or more and less than 0.6. The number of processes can be reduced.

  The layer having the inner surface may be a sealant layer, and may be formed of a thermoplastic resin such as polyolefin. Therefore, when using the chemical means described above, it is preferable to use a lubricant-containing polyolefin.

  The polyolefin for forming the inner surface may be a heat-sealable polyolefin such as LDPE, LLDPE, MDPE, HDPE, polypropylene (PP), for example. These may be used alone or in combination. Among these, LLDPE is preferable from the viewpoint of low-temperature sealability.

  The thickness of the sealant layer is preferably at least 30 μm in order to maintain the pressure resistance as a tube container.

  The inner layer may include other layers such as a resin layer other than polyolefin, an adhesive layer, a metal foil layer other than aluminum foil, a metal vapor deposition film, and an inorganic vapor deposition film in addition to the layer having the inner surface.

<Laminate for tube>
The laminated body for tubes of the present invention includes a layer configuration of “outer layer, aluminum foil layer and inner layer”, and the total value of the thickness of the outer layer and the thickness of the aluminum foil layer is equal to or less than the thickness of the inner layer. Moreover, it is preferable that the total value of the thickness of an outer layer and the thickness of an aluminum foil layer is 0.8 times or less of the thickness of an inner layer, or 0.7 times or less of the thickness of an inner layer.

Therefore, the laminated body for tubes of the present invention satisfies the following formula (I):
(A + B) / C ≦ 1 (I)
{Where A is the thickness of the outer layer, B is the thickness of the aluminum foil layer, and C is the thickness of the inner layer}

  In addition, the thickness of the outer layer, the thickness of the aluminum foil layer, the thickness of the inner layer, and the thickness of the laminated body for the tube are, for example, a thickness meter, an overcurrent type coating thickness measuring device, and an ultrasonic coating thickness measuring device. Although it can be measured using a measuring instrument such as an optical cross-sectional shape measuring instrument, it is preferably measured using the same measuring instrument. In addition, as a thickness meter, for example, “constant pressure thickness measuring instrument J type PG-02” manufactured by Teclock Co., Ltd. can be used.

Here, as shown in FIG. 3, the ultrasonic sealing method, the horn (7) vibrates in the direction of x _3, the amplitude or frequency of ultrasound, horn (7) and seals the interface (6) Stress strain occurs in the tube laminate because of the difference between the anvil (8) and the seal interface (6). As a result, stress is concentrated on the region _{S 1} and _{S 2} adjacent to the sealing surface (6). In that case, the aluminum foil layer in a region S ₁ or S ₂ in the laminate tube are disposed, the aluminum foil layer, has a lower elasticity than the resin layer, the stress load to the aluminum foil layer is concentrated, It is thought that cracks in the aluminum foil layer occur.

On the other hand, when the tube laminate satisfies the condition of the above formula (I), the aluminum foil layer is located closer to the outer surface from the middle in the thickness direction of the tube laminate, so that the stress concentration region (S ₁ , S ₂ ) It is thought that it is hard to crack at the time of ultrasonic sealing by keeping away from ₂ ).

  Moreover, when the laminated body for tubes satisfies the condition of the above formula (I), the aluminum foil layer is closer to the outer surface than the inner surface, so that the metallic gloss when the laminated body for tubes is observed from the outer surface side is improved. You can also.

  Making the total value of the thickness of the outer layer and the thickness of the aluminum foil layer equal to or less than the thickness of the inner layer can be achieved by adjusting the position of the aluminum foil layer in the laminate for a tube. Specifically, when the outer layer, the aluminum foil layer, and the inner layer are laminated, the thickness of each layer may be determined so as to satisfy the condition of the above formula (I).

  Furthermore, in the laminated body for tubes of the present invention, the total value of the thickness of the outer layer and the thickness of the aluminum foil layer is equal to or less than the thickness of the inner layer, and the coefficient of dynamic friction between the inner surfaces is 0.1 or more and 0. Being less than 6 has a synergistic effect and can suppress cracks in the aluminum foil layer during ultrasonic sealing.

  Specifically, when the relationship of the above formula (I) is satisfied and the coefficient of dynamic friction between the inner surfaces is 0.1 or more and less than 0.6, the aluminum foil on the horn side or anvil side at the time of ultrasonic sealing Cracks in the layer can be suppressed.

  On the other hand, even if the relationship of the above formula (I) is satisfied, if the dynamic friction coefficient between the inner surfaces is 0.6 or more, the lubricity of the seal interface is insufficient at the time of ultrasonic sealing, and the frictional force is increased. Stress loading accumulates in the tube laminate. In that case, even if the aluminum foil layer is moved away from the inner surface (seal interface), it is presumed that the aluminum foil layer cannot avoid stress load and easily cracks.

  Therefore, from the viewpoint of suppressing cracks in the aluminum foil layer during ultrasonic sealing, the position of the aluminum foil layer in the tube laminate significantly correlates with the coefficient of dynamic friction between the inner surfaces.

In this connection, as shown in FIG. 2, the ultrasonic sealing of the same material with each other, ultrasound, the seal interface (6) parallel to x ₁ direction, x ₂ direction perpendicular to the sealing surface (6) or x ₁ along the combination of direction and x ₂ direction, it is possible to vibrate. In general, ultrasonic vibration of the x ₁ direction, whereas called lateral vibration type ultrasonic vibration in the x ₂ direction is referred to as a longitudinal vibration type.

  The tube laminate of the present invention is suitable for a transverse vibration type ultrasonic seal, a longitudinal vibration type ultrasonic seal, or a combination thereof, but the coefficient of dynamic friction between the position of the aluminum foil layer and the inner surface of the tube laminate is Therefore, it is particularly suitable for a transverse vibration type ultrasonic seal.

  The total thickness of the tube laminate of the present invention is preferably 300 μm or more, 320 μm or more, or 340 μm in order to prevent cracking of the tube laminate itself during ultrasonic sealing and to secure the pressure resistance of the tube container. . On the other hand, this total thickness is preferably less than 500 μm, 480 μm or less, or 460 μm or less in order to secure the squeeze property of the tube container and to suppress the manufacturing cost and environmental load of the tube container. .

  In addition, when the tube laminate of the present invention is used to form the bottom of the tube container, the inner surface of the tube laminate has a lubricity (that is, a dynamic friction coefficient) suitable for ultrasonic sealing. It is possible to achieve a bottom seal strength equal to or greater than the conventional tube laminate.

<Method for producing laminated body for tube>
The tube laminate of the present invention is obtained by laminating the outer layer, the aluminum foil layer, and the inner layer in this order. As a method of laminating each layer, a laminating method known in the field of packaging materials may be used. Moreover, an outer layer or an inner layer can be formed by laminating as a film or extruding a resin. In general, the aluminum foil layer can be formed by laminating aluminum foil.

  For example, when each of the outer layer, the aluminum foil layer and the inner layer is laminated, a dry lamination method, a sandwich lamination method, a back lamination (extrusion lamination) method, or the like may be used.

  In the dry laminating method, an adhesive for dry laminating dissolved in a solvent is applied to a specific film or foil and dried, and then the adhesive application surface and another film or foil are bonded with a heating roll.

  In the sandwich lamination method, a specific film or foil and another film or foil are bonded via an adhesive.

  In the back lamination (extrusion lamination) method, a molten resin is extruded onto a specific film or foil to form a resin layer. If desired, an anchor coat treatment may be applied to a specific film or foil before extruding the molten resin.

<Tube container and manufacturing method thereof>
The tube container of the present invention has a bottom seal part formed of the tube laminate of the present invention. The tube container can be filled with contents such as medicines, cosmetics, and foods. Examples of the contents include toothpaste, moisturizing cream, sunscreen and the like.

One aspect of the method for producing a tube container of the present invention includes the following steps, and the coefficient of dynamic friction between two inner surfaces sealed when forming the bottom seal portion is 0.1 or more and Is less than 0.6:
A step of obtaining a body part by overlapping the ends of the laminated body and sealing them while rolling the laminated body for a tube of the present invention so that the inner layer is inside;
Connecting a head portion having a shoulder portion and a cap portion to a peripheral edge of one of the two openings of the trunk portion;
Filling the contents from the other opening as desired; and sealing the other opening to form a bottom seal.

  In addition, the process of forming the bottom seal portion is performed by ultrasonic sealing from the viewpoint of preventing the contents from being denatured, reducing the bottom seal time, power consumption and cost, and facilitating the control of the bottom seal. Is preferred. In addition, the ultrasonic seal method is superior in terms of the sealing performance, because it is designed to repel the contents contaminated in the part to be sealed at the time of sealing. It is a method.

  Furthermore, the ultrasonic seal is more preferably a transverse vibration type ultrasonic seal, a longitudinal vibration type ultrasonic seal, or a combination thereof, and particularly preferably a transverse vibration type ultrasonic seal.

  The tube container of the present invention can be manufactured by the above method.

<Materials for making tube laminates>
The materials used are as shown in Table 1 below:

  In Table 1 above, “layer configuration (outer surface → inner surface)” is described from the outer surface to the inner surface of the tube laminate, “/” represents an extrusion laminate, and “//” represents a dry laminate. The number in parentheses represents the thickness [μm], “AL” represents aluminum foil, “EAA” represents ethylene-acrylic acid copolymer, “EMAA” represents ethylene-methacrylic acid copolymer And “f” represents a film. Other abbreviations are as described above.

<Production and Evaluation of Tube Laminate>
According to the following conditions (1) to (4), a laminate for a tube was produced and an evaluation test was performed:
[(1) Extrusion lamination conditions]
The resin was extruded onto a film or aluminum foil at 300 ° C., and back-laminated with a semi-matt roll (KRH 120-4 made of hardened chromium).

[(2) Dry lamination conditions]
On the outer surface or inner surface of each film, using a two-component adhesive prepared with a solid content of 30% (main agent: “TM277” manufactured by Toyo Morton Co., Ltd., curing agent: “cat-10L” manufactured by Toyo Morton Co., Ltd.) The film was applied so that the coating amount was 3.5 g / m ² and bonded to the corona-treated surface of the film. Thereafter, aging was performed at 40 ° C. for 96 days.

[(3) Surface roughness (Rz) measurement conditions]
Surface roughness meter: Using “Surfcoder ET4000A” manufactured by Kosaka Laboratory, create a roughness curve of the inner surface of the tube laminate, and calculate the maximum height of the roughness curve as the surface roughness (Rz). did.

[(4) Friction coefficient measurement conditions]
The dynamic friction coefficient between the sealed surfaces of the tube laminate was measured according to the following conditions:
Friction measuring instrument: “TR-2” manufactured by Toyo Seiki Seisakusho Co., Ltd.
Thread: Stainless 63mm x 63mm (200g)

  When measuring the dynamic friction coefficient, prepare two identical inner layers, attach the non-measurement surface of one inner layer to the thread, and slide the inner surface of the other inner layer on the measured surface of the inner layer at 100 mm / min. The dynamic friction coefficient between the inner surfaces was measured.

[(5) Ultrasonic seal test conditions]
The tube laminate was subjected to an ultrasonic seal test according to the following conditions.
Tube sealer: “TS-2” manufactured by Emerson Japan
Oscillation time: 0.15 seconds Retention time: 0.3 seconds Amplitude: 65%, 75% or 90%
Number of rings: 7
Preheat: None Horn pattern: Pitch (P) 1.4mm, Gap (G) 0.2mm

Next, according to the following evaluation criteria, the finished state of the seal part was evaluated on the horn side and the anvil side and scored:
3 points: No cracks occurred in the aluminum foil layer.
Two points: The aluminum foil layer is cracked, and the width of the crack is less than 0.5 mm in the direction from the bottom seal portion of the tube container toward the head.
1 point: The aluminum foil layer is cracked, and the width of the crack is 0.5 mm or more in the direction from the bottom seal portion of the tube container toward the head.
Here, the width of the crack was measured with a straight scale (made by JIS standard first grade stainless steel).

[(6) Photographic conditions after ultrasonic sealing]
The ultrasonic seal part of the tube laminate obtained according to the above condition (5) was photographed according to the following photographing conditions.
Camera: “Nikon D7000 (single lens reflex)” manufactured by Nikon Corporation
Settings (threshold value, shutter speed, etc.): Manual Flash: None Backlight: “None” or “Yes”
Here, the backlight is to shine light from the back of the sample. Regarding the backlight, when there was no crack in the ultrasonic seal portion, it was set as “None”, while when there was a crack in the ultrasonic seal portion, it was set as “Yes”.

<Examples 1-8 and Comparative Examples 1-8>
[Example 1]
The base material “original fabric 1” was prepared, the outer surface of “original fabric 1” was set as the inner surface of the tube laminate, and the outer surfaces of “original fabric 1” were ultrasonically sealed.

[Example 2]
A PET film (product name “E5200”, thickness: 12 μm) and an LLDPE film (product name “LL-XMN”, thickness: 150 μm) are sandwich-laminated with LDPE resin (product name “L1850K”), and then the remaining PET film The exposed surface and aluminum foil (“A1N30H-O material”, thickness: 12 μm) were sandwich-laminated with EAA resin (product name “A201M”), and the other aluminum foil exposed surface and LLDPE film (product name “L100N”, After sandwich lamination with EAA resin (product name “A201M”), LLDPE was extruded onto the exposed surface of the LLDPE film to obtain a laminated body for a tube having the layer structure shown in Table 1 above.

  Therefore, the obtained tube laminate had an outer layer thickness of 140 μm, an aluminum foil layer thickness of 12 μm, an inner layer thickness of 222 μm, and a total thickness of 374 μm. Next, the inner surfaces of the obtained tube laminate were ultrasonically sealed.

[Example 3]
A PET film (product name “E5200”, thickness: 12 μm) and an LLDPE film (product name “L4102”, thickness: 100 μm) are dry-laminated, and then the remaining exposed surface of the PET film and the LDPE film (Aicero Chemical Co., Ltd.) A custom-made product, thickness: 60 μm) is sand laminated with LDPE resin (product name “L1850K”), and another LDPE film exposed surface and aluminum foil (“A1N30H-O material”, thickness: 12 μm) Sand laminate with EAA resin (product name “A201M”), then back laminate the EAA resin and LDPE resin sequentially on the remaining aluminum foil exposed surface, and LLDPE film (product name “L4102”, thickness on the LDPE resin exposed surface. : 60 μm) is dry laminated and has the layer structure shown in Table 1 above. A laminate for a tube was obtained.

  Therefore, the obtained tube laminate had an outer layer thickness of 135 μm, an aluminum foil layer thickness of 12 μm, an inner layer thickness of 232 μm, and a total thickness of 379 μm. Next, the inner surfaces of the obtained tube laminate were ultrasonically sealed.

[Example 4]
An LLDPE film (product name “L4102”, thickness: 80 μm) was dry-laminated on the outer surface of the base material “raw fabric 2” to obtain a laminated body for a tube. The exposed surface of “L4102”, thickness: 80 μm ”was set as the inner surface of the tube laminate, and the inner surfaces were ultrasonically sealed.

[Example 5]
An LLDPE resin (product name “SP1071C”) was extruded and laminated on the inner surface of the substrate “raw fabric 2” to a layer thickness of 100 μm to obtain a laminate for a tube. The LLDPE resin (product name “SP1071C”) exposed surface of the obtained tube laminate was set as the inner surface of the tube laminate, and the inner surfaces were ultrasonically sealed.

[Example 6]
LLDPE resin (product name “SP1071C”) was extruded and laminated to an outer surface of the base material “raw fabric 1” to a layer thickness of 100 μm to obtain a laminate for a tube. The LLDPE resin (product name “SP1071C”) exposed surface of the obtained tube laminate was set as the inner surface of the tube laminate, and the inner surfaces were ultrasonically sealed.

[Example 7]
An LLDPE film (product name “L4102”, thickness: 60 μm) is dry laminated on the outer surface of the substrate “raw fabric 2”, and an LLDPE film (product name “TUX-FCD-NP”, thickness is applied to the inner surface of “raw fabric 2”. (S: 80 μm) was dry-laminated to obtain a laminate for a tube. The exposed surface of the LLDPE film (product name “TUX-FCD-NP”) of the obtained laminate for tube was set as the inner surface of the laminate for tube, and the inner surfaces were ultrasonically sealed.

[Example 8]
An LLDPE film (product name “L4102”, thickness: 60 μm) is dry laminated on the outer surface of the substrate “raw fabric 1”, and an LLDPE film (product name “TUX-FCD-NP”, thickness is applied to the inner surface of “raw fabric 1”. : 80 μm) was dry-laminated to obtain a laminate for a tube. The exposed surface of the obtained LLDPE film (product name “L4102”) of the tube laminate was set as the inner surface of the tube laminate, and the inner surfaces were ultrasonically sealed.

[Comparative Example 1]
Using “original fabric 2” as a laminated body for tubes, the inner surfaces of “original fabric 2” were ultrasonically sealed.

[Comparative Example 2]
Using “original fabric 2” as a laminated body for tubes, the outer surfaces of “original fabric 2” were ultrasonically sealed.

[Comparative Example 3]
Using “original fabric 1” as a laminate for a tube, the inner surfaces of “original fabric 1” were ultrasonically sealed.

[Comparative Example 4]
An LLDPE film (product name “L4102”, thickness: 80 μm) was dry-laminated on the outer surface of the substrate “raw fabric 2” to obtain a laminate for a tube. The inner surface side of the “raw fabric 2” was set as the inner surface of the tube laminate, and the inner surfaces were ultrasonically sealed.

[Comparative Example 5]
Using “original fabric 3” as a laminate for tubes, the inner surfaces of “original fabric 3” were ultrasonically sealed.

[Comparative Example 6]
Using “original fabric 3” as a laminated body for tubes, the outer surfaces of “original fabric 3” were ultrasonically sealed.

[Comparative Example 7]
LLDPE resin (product name “SP1071C”) is extruded and laminated to the outer surface of the base material “original fabric 1” to a layer thickness of 100 μm, and then the inner surface side of “original fabric 1” is used as the inner surface of the tube laminate. Set and ultrasonically seal the inner surfaces together.

[Comparative Example 8]
An LLDPE film (product name “L4102”, thickness: 60 μm) is dry-laminated on the outer surface of the base material “original fabric 1”, and an LLDPE film (product name “TUX-FCD-NP”, thickness is applied to the inner surface of “original fabric 1”. : 80 μm) was dry-laminated to obtain a laminate for a tube. The exposed surface of the LLDPE film (product name “TUX-FCD-NP”) of the obtained laminate for tube was set as the inner surface of the laminate for tube, and the inner surfaces were ultrasonically sealed.

<Result>
According to the above (3) surface roughness (Rz) measurement conditions, (4) friction coefficient measurement conditions, and (5) ultrasonic seal test conditions, tube stacks for Examples 1-8 and Comparative Examples 1-8 The surface roughness (Rz) of the inner surface (seal interface) of the body and the dynamic friction coefficient between the seal interfaces were measured, and an ultrasonic seal test was performed. The results are shown in Table 2 below. Moreover, about Examples 1-8 and Comparative Examples 1-8, the relationship between the dynamic friction coefficient between inner surfaces, the position of the aluminum foil layer in the laminated body for tubes, and the state of the aluminum foil layer after ultrasonic sealing. As shown in FIG.

  Furthermore, according to the photography conditions after (6) ultrasonic sealing, the ultrasonic sealing part of the tube laminate of Example 1 and Comparative Example 1 was photographed, and the obtained photograph is shown in FIG. At the time of taking a photograph, the backlight was not used in Example 1, and the backlight was used in Comparative Example 1.

  As shown in Table 2, in Comparative Examples 1, 2, 4, and 5, the position of the aluminum foil layer in the tube laminate is close to the inner surface side, and the dynamic friction coefficient between the seal interfaces is 0.6 or more. In addition, cracks in the aluminum foil layer are observed on the horn side and the anvil side.

  In Comparative Examples 3, 7, and 8, the position of the aluminum foil layer in the tube laminate is close to the inner surface side, and cracks in the aluminum foil layer are observed on at least one of the horn side and the anvil side.

  In Comparative Example 6, the coefficient of dynamic friction between the seal interfaces is 0.6 or more, and cracks in the aluminum foil layer are observed on the horn side.

  On the other hand, in Examples 1-8, on the horn side and the anvil side, almost no cracks in the aluminum foil layer are observed, and the total score of the ultrasonic seal test is 5 or more.

  Moreover, when the position of the aluminum foil layer in the laminated body for tubes is close to the inner surface side from FIG. 4, that is, when (A + B) / C> 1, the total score of the ultrasonic seal test is low. It can also be seen that as the dynamic friction coefficient between the seal interfaces increases, the total score of the ultrasonic seal test also decreases.

  Furthermore, from FIG. 4, even when (A + B) / C ≦ 1, when the dynamic friction coefficient between the seal interfaces increases, the stress load accumulates in the tube laminate due to insufficient lubricity of the seal interfaces. Therefore, it can be seen that the aluminum foil layer cannot sufficiently avoid the stress load, and the total score of the ultrasonic seal test is also lowered.

  Furthermore, when FIG. 5 (a) is compared with FIG. 5 (b), the crack of the aluminum foil layer is not seen in the ultrasonic seal portion of the tube laminate obtained in Example 1, whereas the comparison is made. It is clear that cracks in the aluminum foil layer are observed in the ultrasonic seal portion of the tube laminate of Example 1.

DESCRIPTION OF SYMBOLS 1 Laminate for tubes 2 Outer layer 3 Aluminum foil layer 4 Inner layer 5 Outer surface 6 Inner surface (seal interface)
7 Horn 8 Anvil x ₁ Horizontal vibration direction x ₂ Vertical vibration direction x ₃ Horn vibration direction S ₁ Horn side stress concentration area S ₂ Anvil side stress concentration area

Claims (11)

A method for producing a tube container using a laminate for a tube container that is laminated in the order of an outer layer, an aluminum foil layer, and an inner layer ,
A laminating step of forming the laminate for a tube container; and
A bottom sealing step of forming a bottom seal portion of the tube container laminate by ultrasonic sealing between the inner surfaces of the tube container laminate;
Including
The outer layer forms the outer surface of the tube container laminate,
The inner layer forms the inner surface of the tube container stack,
The total value of the thickness of the outer layer and the thickness of the aluminum foil layer is not more than the thickness of the inner layer, and the coefficient of dynamic friction between the inner surfaces is 0.1 or more and less than 0.6,
A method for manufacturing a tube container . The manufacturing method of the tube container according to claim 1, wherein a total value of the thickness of the outer layer and the thickness of the aluminum foil layer is 0.8 times or less of the thickness of the inner layer. The manufacturing method of the container according to claim 2, wherein a total value of the thickness of the outer layer and the thickness of the aluminum foil layer is 0.7 times or less of the thickness of the inner layer. The said dynamic friction coefficient is a manufacturing method of the tube container of any one of Claims 1-3 which are 0.1 or more and 0.5 or less. The tube container manufacturing method according to claim 4, wherein the dynamic friction coefficient is 0.2 or more and 0.5 or less. The said inner surface is a manufacturing method of the tube container of any one of Claims 1-5 formed with a lubricant containing film. The tube container manufacturing method according to claim 6, wherein the lubricant-containing film includes an inorganic lubricant, an organic lubricant, or a mixture thereof. The method of manufacturing a tube container according to any one of claims 1 to 7, wherein the inner surface has a surface roughness (Rz) of 1.3 µm or more and 6.3 µm or less. Between the laminating step and the buttocks sealing step,
A body part forming step of obtaining a body part by rolling the tube body laminate so that the inner layer is on the inside while overlapping and sealing the ends of the tube container laminate; and
A head coupling step of coupling a head having a shoulder portion and a cap portion to one peripheral edge of the two openings of the trunk portion;
The manufacturing method of the tube container of any one of Claims 1-8 containing these. The manufacturing method of the tube container of Claim 9 with which the content is filled from the other opening part of the said trunk | drum. The said ultrasonic seal is a manufacturing method of the tube container of any one of Claims 1-10 which is a transverse vibration type ultrasonic seal.