JP7270436B2 - Laminated tube raw material - Google Patents

Description

TECHNICAL FIELD The present invention relates to a raw laminate tube.

Laminated tubes are known as containers for containing contents such as cosmetics and medicines. A laminate tube is composed of, for example, an aluminum foil for shielding the contents from oxygen, moisture, etc. in the environment, a synthetic resin layer for imparting elasticity or the like to the tube, and the like. In the laminated tube, the contents are sealed with, for example, a screw cap, etc., and when used, the screw cap is opened to squeeze out a small amount of the contents, and after use, the screw cap is attached again to restore the sealed state. .

When squeezing out the content from the laminated tube, the tube is crushed with fingers or the like to deform the tube so that the volume of the tube is reduced, and the content that cannot be accommodated in the tube is pushed out from the mouth. When the tube recovers its original shape after the contents have been extruded and before it is resealed, the volume of the tube is restored and an amount of air corresponding to the extruded contents enters the tube. In this case, the remaining contents in the tube may be altered by the air.

Alternatively, when the first extrusion amount is insufficient, the second extrusion may be performed within a short period of time to make up for the shortage. At this time, if the tube returns to its original shape after the first extrusion and before the second extrusion, only air will come out at the time of re-extrusion, or if you push hard in anticipation that air will come out, A problem of extruding an excessive amount of contents may occur.

Therefore, a laminate tube that has been deformed by being crushed to express its contents may be squeezed to prevent entrapment of air while it is being resealed and to facilitate re-extrusion of the desired amount. It is desired that the crushed deformed state is maintained for a certain period of time.

In this regard, in Patent Document 1, one outermost layer composed of a resin layer having a heat melting function, two aluminum foils, and a synthetic resin layer composed between the aluminum foils are provided. A laminated packaging material having a core layer with a multi-layer structure and another outermost layer composed of a synthetic resin layer having a function to protect the aluminum foil, and having excellent "packaging material return prevention properties" is described as In Example 1 of Patent Document 1, as a specific example of the laminated packaging material, a layer structure of LLDPE (170 μm), aluminum foil (9 μm), LLDPE (40 μm), aluminum foil (15 μm), and LLDPE (90 μm) is described.

JP-A-62-53826

As described above, a laminated tube containing contents such as cosmetics and pharmaceuticals is crushed and deformed in order to squeeze out the contents, and then maintains its crushed and deformed state until it is resealed. It is hoped that However, if this deformed state continues for a long time, it is not aesthetically pleasing. Also, when the tube is crushed, an acute-angled protrusion may be formed at the boundary between the portion pressed by the finger and the portion not pressed. If such a deformed shape is maintained for a long period of time, when the resealed laminate tube is put into a bag or the like and carried around, there is a risk that the sharp corners will be scratched and damaged.

Therefore, after the laminate tube is crushed and deformed to squeeze out the contents, it remains in the crushed deformed state until it is resealed, and after resealing, the deformed state is maintained for a significant period of time. is eliminated and the shape of the tube is restored.

The present invention has been made in view of the above circumstances, and an object of the present invention is to maintain the crushed and deformed state until it is resealed after being crushed and deformed to squeeze out the contents. Laminate tube blank for manufacturing a laminate tube that has both "short-term shape retention" that is maintained and "time recovery" that the shape of the tube is restored in a significant period of time after being resealed. to provide.

The present invention is as follows.

<<Aspect 1>>
A laminate tube blank having a first sealant layer, a first aluminum layer, an intermediate layer, a second aluminum layer, and a second sealant layer in this order,
The intermediate layer has a thickness of more than 60 μm,
The total thickness of the raw laminate tube is 250 μm or more,
Laminated tube raw material.
<<Aspect 2>>
The intermediate layer has a thickness of 65 μm or more and 300 μm or less,
The total thickness of the raw laminate tube is 300 μm or more and 500 μm or less,
The laminate tube blank according to aspect 1.
<<Aspect 3>>
The laminate tube blank according to aspect 1 or 2, wherein the total thickness of the first aluminum layer and the second aluminum layer is less than 40 μm.
<<Aspect 4>>
The laminate tube blank according to any one of aspects 1 to 3, wherein the intermediate layer is a layer composed of a thermoplastic resin.
<<Aspect 5>>
The laminate tube blank according to aspect 4, wherein the thermoplastic resin constituting the intermediate layer is polyolefin.
<<Aspect 6>>
A sample rolled into a cylinder with a diameter of 35 mm and a length of 15 mm was crushed into an elliptical cylinder with a minor diameter of 3 mm under a load and allowed to stand for 3 minutes. A laminate tube raw sheet having a short-term shape retention property of 15 mm or less and a temporal resilience of 17% or more.
Short-term shape retention (mm) = Minor diameter of sample cylinder (mm) after 3 minutes of load removal - 3 (mm)
Temporal resilience (%) = {short diameter of sample cylinder (mm) after 180 minutes of unloading - short diameter of sample cylinder (mm) after 3 minutes of unloading} / short diameter of sample cylinder (mm) after 3 minutes of unloading ×100
<<Aspect 7>>
A laminate tube composed of the laminate tube raw fabric according to any one of aspects 1 to 5.
<<Aspect 8>>
The thickness of the second aluminum layer is greater than the thickness of the first aluminum layer,
The laminate tube according to aspect 7, wherein the second aluminum layer is located closer to the inner layer side of the laminate tube than the first aluminum layer.
<<Aspect 9>>
A laminate tube composed of the laminate tube material according to aspect 6.
<<Aspect 10>>
A lamination tube containing a content, comprising the lamination tube according to any one of aspects 7 to 9 and a content in the lamination tube.
<<Aspect 11>>
11. The lamination tube with content according to aspect 10, wherein the content is selected from cosmetics, quasi-drugs, and pharmaceuticals.

According to the present invention, after being crushed and deformed to squeeze out the contents, the crushed deformed state is maintained until it is resealed. Later, a raw laminate tube is provided for manufacturing a laminate tube having "time-restoreability" in which the shape of the tube is restored in a significant amount of time.

FIG. 1 is a schematic cross-sectional view showing the configuration of the raw laminate tube of the present invention. FIGS. 2(a) to 2(e) are schematic diagrams for explaining the evaluation method of the raw laminate tube sample in the example.

《Laminated tube material》
The laminate tube raw material of the present invention is
A laminate tube blank having a first sealant layer, a first aluminum layer, an intermediate layer, a second aluminum layer, and a second sealant layer in this order,
The intermediate layer has a thickness of more than 60 μm,
The total thickness of the raw laminate tube is 250 μm or more.

After being crushed and deformed to squeeze out the contents, the laminated tube raw material of the present invention maintains the crushed deformed state until it is resealed. It also has "time resilience" in which the shape of the tube is restored in a significant amount of time after being sealed. Therefore, the laminate tube manufactured using the laminate tube raw material of the present invention has a reduced concern that air will enter the tube during the period from squeezing out the contents to resealing, and the desired amount of re-extrusion is facilitated. Furthermore, after resealing, the deformed state, which is not aesthetically pleasing, has the advantage of disappearing with the passage of time, and even if sharp protrusions occur when crushed, resealing is possible. There is less concern that the later tube will be scratched and damaged.

In this respect, the packaging materials of the prior art often have insufficient "short-term shape retention", or even if they have this "short-term shape retention", they often lack "long-term resilience". .

In the laminate tube raw material of the present invention, a high level of "short-term shape retention" is ensured by setting the thickness of the intermediate layer sandwiched between the two aluminum layers in the above laminated structure to more than 60 μm. rice field. In addition, by setting the total thickness of the raw laminate tube to 250 μm or more, it has become possible to have both “short-term shape retention” and “long-term resilience”.

FIG. 1 shows a schematic cross-sectional view for explaining the layer structure of the raw laminate tube of the present invention. The laminate tube raw material (10) in FIG. 1 includes a first sealant layer (1), a first aluminum layer (2), an intermediate layer (3), a second aluminum layer (4), and a second sealant. It is a laminate having layers (5) in this order. The thickness of the intermediate layer (3) is greater than 60 μm. The total thickness of the raw laminate tube (10) is 250 μm or more.

Hereinafter, each layer of the laminate tube material of the present invention will be described in order.

<First sealant layer>
The first sealant layer is heat-sealed with a second sealant layer, which will be described later, when forming the laminate tube material of the present invention into a laminate tube, and has the function of forming and maintaining the tube shape.

The material that constitutes the first sealant layer may comprise a thermoplastic resin, in particular a polyolefin. The material constituting the first sealant layer is preferably a material containing polyolefin or a material containing polyolefin and other thermoplastic resins, more preferably a material made of polyolefin or polyolefin and other thermoplastic resins. It is a material made of resin.

The polyolefin that constitutes the first sealant layer may be, for example, polyethylene, polypropylene, polybutene, or the like. Specific examples of polyethylene for the first sealant layer include high-density polyethylene (HDPE), medium-density polyethylene (MDPE), low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), and the like. As the polyolefin for the first sealant layer, for example, one of the above-exemplified polyolefins may be used alone, or a blend of two or more thereof may be used.

Other thermoplastic resins constituting the first sealant layer include, for example, ethylene/vinyl alcohol copolymer resin (EVOH), cycloolefin polymer (COC), cycloolefin copolymer (COC), polyethylene terephthalate (PET), nylon, etc. can be As other thermoplastic resins for the first sealant layer, for example, one of the above-exemplified resins may be used alone, or a blend of two or more thereof may be used.

The first sealant layer is preferably composed of a polyolefin film containing LLDPE, and more preferably composed of an LLDPE film, from the viewpoint of imparting good low-temperature heat sealability, workability, etc.

The first sealant layer may be a single layer containing one or more selected from the materials exemplified above, or a multilayer in which two or more layers containing one or more selected from the above materials are laminated may be In the case of multiple layers, each layer may be made of the same kind of material, or each layer may be made of different materials.

The thickness of the first sealant layer may be, for example, 25 μm or more, 50 μm or more, 75 μm or more, 100 μm or more, 125 μm or more, or 150 μm or more from the viewpoint of ensuring good adhesion when forming a laminate tube. , from the viewpoint of not excessively impairing short-term shape retention properties, it may be, for example, 300 μm or less, 250 μm or less, 200 μm or less, 175 μm or less, or 150 μm or less.

<First aluminum layer>
The first aluminum layer, together with the second aluminum layer described below, imparts the function of blocking oxygen and moisture to the laminate tube and protects the contents of the laminate tube.

In addition, since the raw laminate film of the present invention has two aluminum layers, that is, the first aluminum layer and the second aluminum layer described later, good short-term shape retention can be obtained.

A commercially available aluminum foil may be used as the first aluminum layer.

The thickness of the first aluminum layer may be, for example, 5 μm or more, 8 μm or more, 10 μm or more, 12 μm or more, or 15 μm or more from the viewpoint of ensuring oxygen barrier properties and moisture barrier properties, which impairs the stability over time. From the viewpoint of not excessively thickening the total layers of the original sheet, the thickness may be, for example, 50 μm or less, 40 μm or less, 30 μm or less, 25 μm or less, 20 μm or less, 18 μm or less, 15 μm or less, or 10 μm or less.

<Middle layer>
The intermediate layer exists between the first aluminum layer described above and the second aluminum layer described later. The intermediate layer specified by the present invention, which has a thickness of more than 60 μm, has the function of setting the short-term shape retention of the laminate tube within a suitable range.

The intermediate layer in the present invention may be composed of any synthetic resin, for example, thermoplastic resins, composite materials thereof, and the like. As the material for the intermediate layer, a thermoplastic resin is preferable from the viewpoint of setting the short-term shape-retaining property and the temporal resilience of the laminate tube within an appropriate range. This thermoplastic resin may be selected from the thermoplastic resins exemplified above as constituting the first sealant layer. Thus, the intermediate layer may consist of a polyolefin, for example polyethylene or polypropylene, HDPE, MDPE, LDPE, LLDPE, etc., in particular LLDPE.

The intermediate layer may be a single layer containing one or more selected from the materials exemplified above, or may be a multilayer in which two or more layers containing one or more selected from the above materials are laminated. good too. In the case of multiple layers, each layer may be made of the same kind of material, or each layer may be made of different materials.

The thickness of the intermediate layer is more than 60 μm from the viewpoint of imparting a high degree of short-term shape retention to the laminate tube. It may be 175 μm or more, or 200 μm or more, and from the viewpoint of not excessively increasing the thickness of the laminate tube, for example, 400 μm or less, 300 μm or less, 275 μm or less, 250 μm or less, 200 μm or less, 175 μm or less, or 150 μm or less. you can The thickness of the intermediate layer may be, for example, 65 μm or more and 300 μm or less.

When the thickness of the intermediate layer is more than 70 μm, for example, 75 μm or more, particularly 100 μm or more, the short-term shape retention effect is increased, which is preferable. When the intermediate layer is thicker than 70 μm, when the raw laminate tube is deformed, the bent portion tends to bend in two stages like a “U” shape, and the restoring force of the sealant layer is reduced. This is considered to be due to the fact that it is dispersed and uniformly added to the adjacent aluminum layers.

<Second aluminum layer>
As described above, the second aluminum layer, together with the first aluminum layer, protects the contents of the laminate tube, prevents the contents of the tube from leaking out of the tube, and provides good short-term shape retention to the laminate tube. It has the function of imparting sexuality.

A commercially available aluminum foil may be used for the second aluminum layer, similarly to the first aluminum layer.

The thickness of the second aluminum layer is appropriately selected from the range described above for the thickness of the first aluminum layer from the viewpoint of ensuring both oxygen barrier properties and moisture barrier properties and maintaining resilience over time. Yes, it can be set. The thickness of the second aluminum layer may be the same as the thickness of the first aluminum layer, or it may be thicker or thinner than the first aluminum layer. The thickness of the second aluminum layer is preferably the same as or thicker than the thickness of the first aluminum layer.

When the thickness of the second aluminum layer is greater than the thickness of the first aluminum layer, disposing the thicker second aluminum layer on the side closer to the contents of the laminate tube than the first aluminum layer. is preferable from the viewpoint of protection of contents. Therefore, when the thickness of the second aluminum layer is larger than the thickness of the first aluminum layer, it is preferable that the second aluminum layer be arranged closer to the inner layer side of the laminate tube than the first aluminum layer.

The total thickness of the first aluminum layer and the second aluminum layer is not particularly limited as long as the thickness of the first aluminum layer and the thickness of the second aluminum layer are within the ranges described above. However, if the total thickness of the aluminum layers becomes excessively large, the restoring force of the intermediate layer and the sealant layer becomes less effective, and the resilience over time may be impaired. From this viewpoint, the total thickness of the first aluminum layer and the second aluminum layer may be 100 μm or less, 80 μm or less, 60 μm or less, 50 μm or less, 40 μm or less, 40 μm or less, or 30 μm or less.

<Second sealant layer>
The second sealant layer is heat-sealed with the first sealant layer to form and maintain the tube shape when the laminate tube material of the present invention is formed into a laminate tube.

The material constituting the second sealant layer may be appropriately selected and used from the materials described above as the materials constituting the first sealant layer. The second sealant layer may consist of a polyolefin, such as polyethylene or polypropylene, and may consist of HDPE, MDPE, LDPE, LLDPE, etc., especially LLDPE. Also, the second sealant layer may be a single layer or multiple layers.

The material comprising the second sealant layer may be the same as or different from the material comprising the first sealant layer. However, from the viewpoint of increasing the adhesive strength of the heat-sealed portion of the laminated tube, the first sealant layer and the second sealant layer are preferably made of the same material.

The thickness of the second sealant layer is appropriately selected from the range described above for the thickness of the first sealant layer, from the viewpoint of achieving both adhesion when forming a laminated tube and maintaining resilience over time. , may be set. The thickness of the second sealant layer may be the same as the thickness of the first sealant layer, or it may be thicker or thinner than the first sealant layer.

<Total thickness of raw laminate tube>
The total thickness of the raw laminate tube of the present invention is 250 μm or more. By setting the total thickness of the raw laminate tube to 250 μm or more, the laminate tube is imparted with appropriate resilience over time.

The total thickness of the raw laminate tube is 250 μm or more, for example, 275 μm or more, 300 μm or more, 325 μm or more, 350 μm or more, 375 μm or more, or 400 μm, from the viewpoint of setting the resilience of the laminate tube to a suitable range. From the viewpoint of not impairing the short-term shape retention property, the thickness may be, for example, 500 μm or less, 400 μm or less, 375 μm or less, or 350 μm or less. The total thickness of the raw laminate tube may be, for example, 300 μm or more and 500 μm or less.

<printing>
In the raw laminate tube of the present invention, characters, patterns, background colors, etc. may be printed on the front side (outer layer side) of the sealant layer (for example, the first sealant layer) which is the outermost layer. This printing may be performed by a suitable printing method such as, for example, flexographic printing.

<Functions of raw laminate tube>
By using the raw laminate tube of the present invention, a laminate tube excellent in short-term shape retention and stability over time can be obtained. Specifically, for example, a laminate tube raw fabric sample rolled into a cylinder with a diameter of 35 mm and a length of 15 mm is crushed into an elliptical cylinder with a minor diameter of 3 mm under a load and left to stand for 3 minutes. When the load is removed, the short-term shape retention, which is represented by the following formula, may be 15 mm or less, and the resilience over time may be 17% or more.
Short-term shape retention (mm) = Minor diameter of sample cylinder (mm) after 3 minutes of load removal - 3 (mm)
Temporal resilience (%) = {short diameter of sample cylinder (mm) after 180 minutes of unloading - short diameter of sample cylinder (mm) after 3 minutes of unloading} / short diameter of sample cylinder (mm) after 3 minutes of unloading ×100

If the short-term shape retention property represented by the above formula is 15 mm or less, the laminate tube raw material of the present invention is crushed and deformed to squeeze out the contents, and then crushed until it is resealed. The deformed state tends to be maintained. Short term shape retention may be 13 mm or less, or 10 mm or less. The theoretical minimum value of this short-term shape retention property is 0 mm, but even if it is 1 mm or more, 3 mm or more, or 5 mm or more, the intended effect of the present invention can be sufficiently exhibited.

When the raw laminate tube of the present invention has a resilience over time of 17% or more, which is represented by the above formula, after being crushed and resealed in a deformed state, the deformed state is eliminated in a significant time and the tube shape tends to be restored. The resilience over time may be 20% or more, 24% or more, or 27% or more. The larger the numerical value of this resilience over time, the better. can be expressed in

The short-term shape retention and the resilience over time may be specifically measured, for example, by the methods described in Examples below.

《Manufacturing method of raw laminate tube》
The raw laminate tube of the present invention may be produced by any method.

The laminate tube material of the present invention is, for example,
The first sealant layer, the first aluminum layer, the intermediate layer, the second aluminum layer, and the second sealant layer may be separately prepared and then bonded to each other, or
It may be manufactured by a method of forming a part of the layers constituting the raw laminate tube of the present invention and then forming other layers on this layer.

A method such as dry lamination or hot-melt lamination may be used to laminate a plurality of separately prepared layers by adhesion. A method such as extrusion lamination may be used to form another layer on the formed layer.

《Laminate tube》
Another aspect of the present invention provides a laminate tube made of the laminate tube material of the present invention.

The laminate tube of the present invention may have, for example, a body portion, a shoulder portion, a mouth portion, and a cap, and the body portion may be composed of the laminate tube material of the present invention.

For example, the body may be formed by forming the raw laminate tube of the present invention into a cylindrical shape, and may be open at one end and closed at the other end. The shoulder may extend from the open end of the barrel to the mouth. The spout may function to engage the cap to seal the interior of the container. The manner in which the mouth portion and the cap are engaged may be any method such as snap-fitting or screwing.

In the trunk portion, the laminate tube material of the present invention may be formed into a cylindrical shape by heat sealing, for example, with the second sealant layer as the innermost layer. The shoulder portion and the mouth portion may each be composed of the raw laminate tube of the present invention, or may be composed of any other material. The cap may be constructed from any material.

Since the laminate tube of the present invention is excellent in short-term shape retention, after being crushed and deformed for squeezing out the contents, the crushed deformed state is maintained until it is resealed. Therefore, the laminate tube of the present invention has a reduced risk of air being sucked into the tube. Furthermore, if the first extrusion is insufficient, it is easy to re-extrude the desired amount within a short period of time. Therefore, it can be suitably applied to cosmetics, quasi-drugs, pharmaceuticals, etc., which are concerned about deterioration due to oxygen in the air and can be re-extruded within a short period of time.

In addition, since the laminate tube of the present invention is excellent in resilience over time, the crushed deformed state is eliminated over time after resealing, and is excellent in appearance. Furthermore, even if an acute-angled protrusion is formed when the tube is crushed, the acute-angled protrusion will be eliminated or alleviated over time after the tube is sealed, so that the tube will be scratched and damaged. The risk of contents leaking out is reduced.

《Laminate tube with contents》
In another aspect of the present invention, a filled laminate tube is provided comprising the laminate tube of the present invention and a content within the laminate tube.

The content in the content-filled laminated tube of the present invention may be selected from, for example, cosmetics, quasi-drugs, pharmaceuticals, and the like.

<<Example 1>>
(1) Production of Raw Laminated Tube A raw laminated tube having the following layer structure and a total thickness of 354 μm was manufactured by a method of sequentially dry-laminating each layer with a urethane-based adhesive.
A first sealant layer (LL, 130 μm thick), a first aluminum layer (AL, 9 μm thick), an intermediate layer (LL, 70 μm thick), a second aluminum layer (AL, 15 μm thick), and a second sealant. Layer (LL, thickness 130 μm)

In the above, "LL" means linear low density polyethylene film and "AL" means aluminum foil.

(2) Evaluation of Laminated Tube Raw Fabric The laminated tube raw fabric was evaluated by the method shown in FIGS.

Create 16 laminate tube raw fabric samples cut to a width of 112 mm and a length of 15 mm. On a flat and horizontal square pedestal with an appropriate interval, the sample cylinders were arranged in a matrix of 4 vertical x 4 horizontal so that the axis of the sample cylinder was parallel to the surface of the pedestal, and fixed with adhesive tape (Fig. 2). (a)).

Spacers with a thickness of 3 mm are placed at the four corners of the pedestal, a flat plate is placed on the 16 samples, each sample is crushed into an approximately elliptical cylinder with a short diameter of 3 mm, and a weight of 5 kg is placed on the plate. It was left to stand for 3 minutes while a load was applied to it (Fig. 2(b)). After standing for 3 minutes, the weight and plate were removed to remove the load (Fig. 2(c)), and the short diameter of the crushed sample cylinder was measured at predetermined intervals (Fig. 2(d), (e )). At this time, using the measured values 3 minutes after the load was removed (Fig. 2 (d)) and 180 minutes (Fig. 2 (e)), the values calculated by the following formulas were used to determine the short-term shape retention and aging. Restorability was evaluated. As the value of the short diameter of the sample cylinder 3 minutes after the load was removed and 180 minutes after the load was removed, the average value of the measured values of 16 samples was adopted.
Short-term shape retention (mm) = Minor diameter of sample cylinder (mm) after 3 minutes of load removal - 3 (mm)
Temporal resilience (%) = {short diameter of sample cylinder (mm) after 180 minutes of unloading - short diameter of sample cylinder (mm) after 3 minutes of unloading} / short diameter of sample cylinder (mm) after 3 minutes of unloading ×100

As a result, the raw laminate tube of Example 1 had a short-term shape retention of 14 mm and a resilience over time of 29%.

Short-term shape retention can be evaluated according to the following criteria.
Short-term shape retention 10 mm or less: "excellent" state in which the deformation is maintained for about 3 minutes after the laminate tube is crushed and deformed.
Short-term shape retention More than 10 mm and 13 mm or less: A "good" state in which the deformation is substantially maintained for about 3 minutes after the laminate tube is crushed and deformed.
Short-term shape retention More than 13 mm and 15 mm or less: "Fair" state in which the degree of shape restoration is small in about 3 minutes after the laminate tube is crushed and deformed.
Short-term shape retention More than 15 mm: A "poor" state in which the degree of shape recovery is large within 3 minutes after the laminate tube is crushed and deformed.

The resilience over time can be evaluated according to the following criteria.
Restorability over time 24% or more: "excellent" state in which the shape of the laminate tube is sufficiently restored 180 minutes after the laminate tube is resealed.
Restorability over time 20% or more and less than 24%: A "good" state in which the shape of the laminate tube was generally restored 180 minutes after resealing.
Restorability over time 17% or more and less than 20%: "Good" state in which the shape of the laminate tube was slightly restored 180 minutes after resealing.
Restorability over time Less than 17%: "Poor" condition where the shape of the laminate tube is not substantially restored even after 180 minutes after resealing.

<<Examples 2 to 15, and Comparative Examples 1 and 2>>
A raw laminate tube was produced and evaluated in the same manner as in Example 1, except that the thickness of each layer was changed as shown in Table 1. The evaluation results are shown in Table 1.

<<Example 16 and Comparative Example 3>>
A raw laminate tube was produced and evaluated in the same manner as in Example 5, except that the thicknesses of the first and second sealant layers were changed as shown in Table 2. The evaluation results are shown in Table 2 together with the evaluation results of Example 5.

As seen in Tables 1 and 2,
A laminate tube blank having a first sealant layer, a first aluminum layer, an intermediate layer, a second aluminum layer, and a second sealant layer in this order,
The intermediate layer is made of LL, which is a thermoplastic resin, and has a thickness of more than 60 μm,
The laminated tube raw fabrics of Examples 1 to 16, in which the total thickness of the laminated tube raw fabric is 250 μm or more,
By exhibiting "short-term shape retention" in which the crushed deformed state is maintained for 3 minutes after being crushed and deformed to squeeze out the contents of the tube, the tube can be resealed after crushing. reducing the risk of air entering the container and facilitating the re-squeezing of the desired amount of contents within a short period of time;
The shape of the tube is restored within 180 minutes after it has been crushed and deformed, so it has the advantage of being aesthetically pleasing. It was verified that the risk was reduced.

In particular, when the total thickness of the first aluminum layer and the second aluminum layer is less than 40 μm, for example, 35 μm or less, particularly 30 μm or less, in the index of “resilience over time”, the effect of restoring over time is large, and is particularly preferred. . This is probably because if the total thickness of the aluminum layers becomes excessively thick, the restoring force of the intermediate layer and the sealant layer becomes less effective against the shape retention force, which is the inherent effect of the aluminum layers.

In addition, in terms of the index of "short-term shape retention", when the thickness of the intermediate layer exceeds 70 μm, for example, 75 μm or more, particularly 100 μm or more, the short-term shape retention effect is large, which is particularly preferable. This is because if the intermediate layer is thick, when the raw laminate tube is bent, the bent portion tends to bend in two stages like a "U" shape, and therefore the restoring force of the sealant layer is It is believed that this is because the ingredients are uniformly added while being dispersed in the layers.

REFERENCE SIGNS LIST 1 first sealant layer 2 first aluminum layer 3 intermediate layer 4 second aluminum layer 5 second sealant layer 10 raw laminate tube

Claims (7)

A laminate tube blank having a first sealant layer, a first aluminum layer, an intermediate layer, a second aluminum layer, and a second sealant layer in this order,
The first sealant layer and the second sealant layer are layers each made of linear low-density polyethylene and having a thickness of 50 μm or more and 170 μm or less,
The intermediate layer is a layer made of linear low-density polyethylene and having a thickness of 70 μm or more and 270 μm or less,
The total thickness of the raw laminate tube is 275 μm or more,
Laminated tube raw material. The total thickness of the raw laminate tube is 300 μm or more and 500 μm or less,
The laminate tube raw fabric according to claim 1. 3. The raw laminate tube according to claim 1, wherein the total thickness of said first aluminum layer and said second aluminum layer is less than 40 [mu]m. The laminate tube blank according to any one of claims 1 to 3, wherein the intermediate layer has a thickness of 170 µm or more. The raw laminate tube according to any one of claims 1 to 4, wherein the total thickness of the raw laminate tube is 406 µm or more. A laminate tube composed of the laminate tube material according to any one of claims 1 to 5. The thickness of the second aluminum layer is greater than the thickness of the first aluminum layer,
7. The laminate tube according to claim 6 , wherein the second aluminum layer is located closer to the inner layer of the laminate tube than the first aluminum layer.

Images