Patent Description:
Laminated tube containers have been widely used as containers configured to contain toiletries such as hair rinses, hair treatments, toothpastes and the like and paste seasonings.

The laminated tube container has a tube body formed by a laminated sheet that includes a light blocking layer such as an aluminum layer disposed between an innermost layer and an outermost layer, the innermost layer and the outermost layer being formed by a resin material such as polyethylene, for example. One end of the tube body is integrally provided with a resin head that includes a shoulder and a mouth portion protruding from the shoulder and the other end of the tube body is crushed flat and closed. In this manner, the tube container is formed into a container that can contain content. The tube body is flexible, and the content contained in the tube body can be pushed out and thus extracted from the mouth portion to the outside by squeezing the tube body by hand.

The tube body constituting the above described laminated tube container is manufactured in the following manner; a belt-like laminated sheet is rolled so that the both side edges thereof butt against each other, the butted portion is bonded by means of welding or adhesion to form the laminated sheet into a tube shape, and the laminated sheet formed into a tube shape is cut into a predetermined length. In this case, in order to reinforce the bonding portion of both side edges of the tube body, it is common that a resin reinforcing tape is attached to the inner surface of the tube body along the butted portion (see Patent Literature <NUM> (PTL <NUM>)).

<CIT> refers to a packaging tube including a body formed from a laminate containing a metal foil and a plastic layer is provided with a strip also formed from a laminate incorporating a metal foil and a plastic film. The metal foil in the strip is thicker than the metal foil in the body laminate. The strip provides dead-fold characteristics. The strip may extend along a joint, such as a butt joint, in the tube body so that the strip covers the joint.

<CIT> discloses multi-layer laminate materials, which include an aluminum foil layer having particular tensile strength properties. The aluminum foil layer in combination with other layers provides important benefits in manufacturing operations, such as filling tubes made by forming a cylinder from the laminate materials and heat sealing the side and end edges. These benefits are obtained in many cases without the need to increase foil weight or layer thickness. The laminate materials preserve the flexibility of conventional tubes, for example toothpaste tubes, as required to dispense products from a tube opening with the application of manual squeezing forces.

In the above described conventional laminated tube container, a tube body is provided with a light blocking layer such as an aluminum layer to ensure light blocking properties, and deterioration or alteration or the like of the content contained in the tube body caused by contact thereof with light is prevented.

However, the bonded area of the bonding portion on both side edges of the laminated sheet constituting the tube body is small, and the bond is occasionally detached and butted portions on both side edges are connected only by a reinforcing tape. In this case, the reinforcing tape has no light blocking properties, which causes a gap between both side edges where bond therebetween has been detached. As a result the light blocking properties of the tube body is decreased.

In view of the above described problem, the object of the present disclosure is to provide a laminated tube container capable of ensuring light blocking properties at a butted portion of a tube body.

The present invention refers to a laminated tube container according to claim <NUM>.

Advantageous embodiments may include features of depending claims.

Thus a laminated tube container according to the present disclosure is a laminated tube container having a tube body that includes a light blocking layer between an innermost layer and an outermost layer made of resin. The tube body has a butted portion in which both side edges of a laminated sheet constituting the tube body butt against each other; and a reinforcing tape portion provided on an inner surface of the tube body along the butted portion. The reinforcing tape portion has a pair of resin layers and an intermediate layer that includes an aluminum layer and is disposed between the pair of resin layers. A resin cover portion configured to cover both side edges of the intermediate layer is provided on both sides of the reinforcing tape portion. A color of the cover portion is different from a color of the resin layer on the side exposed to the inside of the tube body and a color of the intermediate layer.

In the laminated tube container according to the present disclosure configured in the above described manner, preferably, the innermost layer and the outermost layer of the tube body are made of polyethylene, and each of the pair of resin layers of the reinforcing tape portion is a polyethylene layer.

In the laminated tube container according to the present disclosure configured in the above described manner, preferably, the light blocking layer is an aluminum layer.

In the laminated tube container according to the present disclosure configured in the above described manner, preferably, one end of the tube body is integrally provided with a resin head that includes a shoulder and a mouth portion protruding from the shoulder and the other end thereof is crushed flat and closed.

According to the present disclosure, a laminated tube container capable of ensuring light blocking properties in the butted portion of the tube body is provided.

The present disclosure will be illustrated in more detail below with reference to drawings.

A laminated tube container <NUM> according to an embodiment of the present disclosure illustrated in <FIG> is used for applications of a container that contains toiletries such as hair rinses, hair treatments, toothpastes and the like and paste seasonings as content. The laminated tube container <NUM> has a tube body <NUM> and a head <NUM>.

The tube body <NUM> is formed into a substantially cylindrical shape by rolling a laminated sheet <NUM> formed into a belt-like shape so that both side edges 11a and 11b thereof butt against each other and by bonding, in a butted portion <NUM>, the both side edges 11a and 11b to each other by means of welding, adhesion, and the like. As illustrated in <FIG>, in the present embodiment, although the tube body <NUM> has a substantially cylindrical shape, it may have an elliptical-cylindrical shape as far as it is substantially tubular.

As illustrated in <FIG>, one end of the tube body <NUM> is crushed flat and the crushed portion is closed by welding. In this manner, the tube body <NUM> is formed into a substantially cylindrical shape in which the butted portion <NUM> between side edges 11a and 11b of the laminated sheet <NUM> constituting the tube body <NUM> extends from one end to the other end in the axial direction, and since one end of the tube body <NUM> is crushed flat and closed, the tube body <NUM> is also formed into a shape that includes an accommodation space S for content.

As illustrated in <FIG>, the tube body <NUM> has a laminated structure that includes an aluminum layer (AL layer) <NUM>, as a light blocking layer, disposed between an innermost layer <NUM> made of polyethylene and an outermost layer <NUM> also made of polyethylene(PE), and is flexible enough to be easily deformed by hand. The tube body <NUM> includes the aluminum layer <NUM> as a light blocking layer, and thus has high light blocking properties and barrier properties.

Although use of a linear low-density polyethylene (LLDPE) may be preferable as a polyethylene constituting the innermost layer <NUM> and the outermost layer <NUM>, other types of polyethylene may be used. The light blocking layer is not limited to the above described aluminum layer <NUM>, and it may be other layers having light blocking properties, such as a polyethylene terephthalate (PET) layer with silver print all over the surface thereof by a vapor deposition, for example.

A variety of layer structures may be adopted as a laminated structure of the tube body <NUM> as far as at least a light blocking layer is provided between the innermost layer <NUM> and the outermost layer <NUM> made of polyethylene. For example, in addition to the light blocking layer, other polyethylene layers such as a polyethylene terephthalate layer and a low-density polyethylene (LDPE) may be provided between the innermost layer <NUM> and the outermost layer <NUM>. In any layer structures, an adhesion layer such as an anchor coat layer and a dry laminate layer may be further provided to improve adhesion properties between layers.

As illustrated in <FIG>, the head <NUM> is made of polyethylene, and has a shoulder <NUM> formed into a shade. The head <NUM> is provided to the tube body <NUM> integrally and continuously through welding of the outer peripheral edge of the shoulder <NUM> over the entire circumference of one end of the tube body <NUM>. A cylindrical mouth portion <NUM> is protruded outward from the central portion of the shoulder <NUM>. The top end of the mouth portion <NUM> is formed as a spout 22a from which the content is poured. With the above described head <NUM>, by squeezing the tube body by hand, the content contained in the accommodation space S can be pushed out from the spout 22a of the mouth portion <NUM>, thus can be extracted easily.

Although not illustrated in detail, the mouth portion <NUM> may be provided with a member such as a spout cap with a lid and the like.

In order to reinforce the bonding portion of the butted portion <NUM> in the tube body <NUM>, a reinforcing tape portion <NUM> is provided on an inner surface of the tube body <NUM> along the butted portion <NUM>.

As illustrated in <FIG>, the reinforcing tape portion <NUM> has, as a resin layer, an outer polyethylene layer (PE layer) <NUM> in contact with an inner surface of the tube body <NUM> and an inner polyethylene layer (PE layer) <NUM> exposed to the accommodation space S of the tube body <NUM>. The reinforcing tape portion <NUM> also has an intermediate layer <NUM> between a pair of polyethylene layers <NUM> and <NUM>. The outer polyethylene layer <NUM> is welded to the inner surface of the polyethylene innermost layer <NUM> of the tube body <NUM>, and consequently the reinforcing tape portion <NUM> is attached to the inner surface of the tube body <NUM> as it bridges over both side edges 11a and 11b of the butted portion <NUM>. Although a linear low-density polyethylene (LLDPE) may preferably be used as a polyethylene constituting the outer polyethylene layer <NUM> and the inner polyethylene layer <NUM>, other types of polyethylene such as a low-density polyethylene (LDPE) and the like may be used.

It is to be noted that, the reinforcing tape portion <NUM> may be attached to the inner surface of the innermost layer <NUM> of the tube body <NUM> by adhesion, instead of welding.

As illustrated in <FIG>, the reinforcing tape portion <NUM> extends from one end being continuous with the head <NUM> of the tube body <NUM> to the closed other end along the butted portion <NUM>, and is attached to the inner surface of the tube body <NUM> by bridging over both side edges 11a and 11b over the entire range of the butted portion <NUM> in the longitudinal direction. In this manner, bonding of the butted portion <NUM> of the tube body <NUM> is reinforced by the reinforcing tape portion <NUM> and, even if bonding of both side edges 11a and 11b is detached in the butted portion <NUM>, the butted portion <NUM> is kept connected by the reinforcing tape portion <NUM>, and thus the content is prevented from leaking from that portion.

As illustrated in <FIG>, the intermediate layer <NUM> includes an aluminum layer (AL layer) 33a and a polyethylene terephthalate layer (PET layer) 33b. Since the intermediate layer <NUM> includes the aluminum layer 33a, the reinforcing tape portion <NUM> has high light blocking properties. Therefore, even if the bonding of both side edges 11a and 11b is detached in the butted portion <NUM> and the butted portion <NUM> of the both side edges 11a and 11b is connected only by the reinforcing tape portion <NUM>, which causes a gap between both side edges 11a and 11b where bonding is detached, the reinforcing tape portion <NUM> having the light blocking properties enables the tube body <NUM> to ensure the light blocking properties at a portion where bonding of both side edges 11a and 11b is detached.

In this manner, according to the laminated tube container <NUM> of the present embodiment, the reinforcing tape portion <NUM> provided along the butted portion <NUM> of the tube body <NUM> includes the aluminum layer 33a. Thus, even if the bonding of both side edges 11a and 11b of the butted portion <NUM> is detached, the light blocking properties can be reliably ensured in the butted portion <NUM> of the tube body <NUM>. In this manner, the content contained in the accommodation space S of the tube body <NUM> is reliably prevented from being deteriorated or altered when it is exposed to light.

Furthermore, in the laminated tube container <NUM> according to the present embodiment, in addition to the aluminum layer 33a, the polyethylene terephthalate layer 33b is provided to the reinforcing tape portion <NUM> disposed along the butted portion <NUM> of the tube body <NUM>. In this manner, the strength of the reinforcing tape portion <NUM> is increased and bonding of both side edges 11a and 11b in the butted portion <NUM> can be more reliably reinforced.

The laminated structure of the reinforcing tape portion <NUM> is not limited to the above described structures, and a variety of layer structures can be adopted as far as at least light blocking layer such as the aluminum layer 33a is provided. For example, a low-density polyethylene layer (LDPE layer) formed by extrusion molding may be provided between the outer polyethylene layer <NUM> and the aluminum layer 33a. Moreover, in any layer structures, in order to increase adhesion between layers, an adhesion layer such as an anchor layer and a dry laminate layer may be further provided.

The content contained in the accommodation space S of the tube body <NUM> includes those whose quality is degraded due to a change in color thereof when being in contact with the aluminum layer 33a and those eroding the aluminum layer 33a. In order to enable the container to be used in an application in which the above described content is contained, the laminated tube container <NUM> according to the present embodiment is provided with a cover portion <NUM> on each of both sides of the reinforcing tape portion <NUM> as illustrated in <FIG>.

As with the polyethylene layer <NUM> constituting the reinforcing tape portion <NUM>, the cover portion <NUM> is made of polyethylene. The cover portion <NUM> is integrally formed with the inner side polyethylene layer <NUM> and covers both circumferential side edges of the intermediate layer <NUM> over the entire range in the longitudinal direction. The cover portion <NUM> is also welded to the inner surface of the innermost layer <NUM> of the tube body <NUM>. In other words, as for the aluminum layer 33a constituting the intermediate layer <NUM>, both side edges thereof exposed from between the polyethylene layers <NUM> and <NUM> are covered with the cover portion <NUM>, and is separated from the accommodation space S. In this manner, the content contained in the accommodation space S is prevented from being in contact with the aluminum layer 33a, and quality degradation due to a change in color or the like of the content can be prevented.

In this manner, in the laminated tube container <NUM> according to the present embodiment, both side edges of the aluminum layer 33a provided to the reinforcing tape portion <NUM> are covered with the cover portion <NUM>, and as a result, the light blocking properties of the tube body <NUM> can be improved by adopting the reinforcing tape portion <NUM> having the aluminum layer 33a, and quality degradation due to a change in color of the content can be prevented by preventing the content from being in contact with the aluminum layer 33a.

The tube body <NUM> provided with the reinforcing tape portion <NUM> having the cover portion <NUM> can be manufactured by the following procedure.

First, as illustrated in <FIG>, the belt-like laminated sheet <NUM> transferred toward a molding apparatus <NUM> is rolled by the molding apparatus <NUM> such that both side edges 11a and 11b thereof are butted against each other. Then both side edges 11a and 11b are welded in the butted portion <NUM> to form the tube body <NUM> having a substantially cylindrical shape. Furthermore, a reinforcing tape <NUM> is fed from a feeder toward the inside of the tube body <NUM> formed into a substantially cylindrical shape, and the reinforcing tape <NUM> is attached, by welding, to the inner surface of the tube body <NUM>, along the butted portion <NUM> of both side edges 11a and 11b.

In this context, as illustrated in <FIG>, the reinforcing tape <NUM> has an outer polyethylene layer <NUM> corresponding to the polyethylene layer <NUM> of the reinforcing tape portion <NUM>, an inner polyethylene layer <NUM> corresponding to the polyethylene layer <NUM> of the reinforcing tape portion <NUM> and the intermediate layer <NUM> corresponding to the intermediate layer <NUM> of the reinforcing tape portion <NUM>. The intermediate layer <NUM> has an aluminum layer 53a and a polyethylene terephthalate layer 53b corresponding, respectively, to the aluminum layer 33a and the polyethylene terephthalate layer 33b of the intermediate layer <NUM>. The intermediate layer <NUM> has a polyethylene layer 53c further inside the polyethylene terephthalate layer 53b. When the reinforcing tape <NUM> is welded to the inner surface of the tube body <NUM>, the polyethylene layer 53c integrates with the polyethylene layer <NUM> and constitutes, with the polyethylene layer <NUM>, the polyethylene layer <NUM> of the reinforcing tape portion <NUM>.

Although the outer polyethylene layer <NUM> and the intermediate layer <NUM> have the same circumferential width, the reinforcing tape <NUM> has a sectional shape in which the inner polyethylene layer <NUM> has a circumferential width wider than that of the outer polyethylene layer <NUM> and the intermediate layer <NUM>.

The above described reinforcing tape <NUM> can be fed to the tube body <NUM> by using a feeder <NUM> of the reinforcing tape <NUM> as illustrated in <FIG>. In other words, the feeder <NUM> has two rolls <NUM> and <NUM>. The roll <NUM> feeds a tape body 50a having a laminated structure in which the intermediate layer <NUM> is laminated on the outer polyethylene layer <NUM> in advance and the roll <NUM> feeds a tape body 50b made of polyethylene with a width larger than that of the tape body 50a corresponding to the inner polyethylene layer <NUM>. The tape body 50a fed from the roll <NUM> and the tape body 50b fed from the roll <NUM> are overlaid on top of one another when they are passed through a guide roller <NUM>, and are formed into the reinforcing tape <NUM> having a sectional shape illustrated in <FIG>. The reinforcing tape <NUM> formed in the above described manner is fed to the inside of the tube body <NUM> formed into a substantially cylindrical shape through the guide roller <NUM> and is welded to the inner surface of the tube body <NUM>. Further, the reinforcing tape <NUM> is welded to the inner surface of the tube body <NUM>, and the tape body 50a and the tape body 50b are integrated. In this manner the reinforcing tape portion <NUM> is formed. In this context, the innermost side of the intermediate layer <NUM> is provided with the polyethylene layer 53c, which allows, at the polyethylene layer 53c, the tape body 50a to be tightly welded to the polyethylene layer <NUM> of the tape body 50b. In this manner, the tape body 50a and the tape body 50b are integrated in a reliable manner.

The reinforcing tape <NUM> fed to the inner surface of the tube body <NUM> by using the feeder <NUM> is pushed against the inner surface of the tube body <NUM> while being heated up to a predetermined temperature by the molding apparatus <NUM>, and welded to the butted portion <NUM> of both side edges 11a and 11b. In this context, since the circumferential width of the inner polyethylene layer <NUM> of the reinforcing tape <NUM> is wider than that of the outer polyethylene layer <NUM> and the intermediate layer <NUM>, a portion of the inner polyethylene layer <NUM> protruded outward in the circumferential direction with respect to the circumferential end portion of the intermediate layer <NUM> is welded to the inner surface of the tube body <NUM> while being deformed such that it covers the circumferential end portion of the intermediate layer <NUM>. According to the above described molding procedure, as illustrated in <FIG>, the reinforcing tape portion <NUM> being integrally continuous with the polyethylene layer <NUM> and provided with the cover portion <NUM> covering both side edges of the intermediate layer <NUM> can be easily and reliably formed on the inner surface of the tube body <NUM> along the butted portion <NUM>.

It is to be noted that the tube body <NUM> having an inner surface attached with the reinforcing tape portion <NUM> is thereafter cut into a predetermined length and one end thereof is crushed flat and closed.

<FIG> are cross-sectional views each illustrating another molding procedure of the reinforcing tape portion, and <FIG> is a schematic diagram of an apparatus configured to feed the reinforcing tape illustrated in <FIG>. In <FIG> and <FIG>, the members corresponding to the above described members are assigned with the same reference signs.

The reinforcing tape portion <NUM> having the cover portion <NUM> can be molded in accordance with the molding procedure illustrated in <FIG>.

In the case illustrated in <FIG>, as illustrated in <FIG>, a reinforcing tape <NUM> is used. The tape <NUM> has an outer polyethylene layer <NUM> corresponding to the polyethylene layer <NUM> of the reinforcing tape portion <NUM>, an inner polyethylene layer <NUM> corresponding to the polyethylene layer <NUM> of the reinforcing tape portion <NUM> and an intermediate layer <NUM> corresponding to the intermediate layer <NUM> of the reinforcing tape portion <NUM>. The intermediate layer <NUM> has an aluminum layer 63a and a polyethylene terephthalate layer 63b corresponding, respectively, to the aluminum layer 33a and the polyethylene terephthalate layer 33b of the intermediate layer <NUM>.

In the reinforcing tape <NUM>, although all of the outer polyethylene layer <NUM>, the intermediate layer <NUM> and the inner polyethylene layer <NUM> have the same circumferential width, the intermediate layer <NUM> is thinner than the outer polyethylene layer <NUM> and the inner polyethylene layer <NUM>.

The above described reinforcing tape <NUM> can be fed to the tube body <NUM> by using a feeder <NUM> of the reinforcing tape <NUM> illustrated in <FIG>. The feeder <NUM> has a roll <NUM> configured to feed the reinforcing tape <NUM> of a laminated structure in which the intermediate layer <NUM> is laminated between the outer polyethylene layer <NUM> and the inner polyethylene layer <NUM> in advance, and feeds the reinforcing tape <NUM> fed from the roll <NUM> to the inside of the tube body <NUM> through the guide rollers <NUM> and <NUM>.

The reinforcing tape <NUM> fed to the inner surface of the tube body <NUM> by using the feeder <NUM> is pushed against the inner surface of the tube body <NUM> while being heated up to a predetermined temperature by the molding apparatus <NUM> and welded to the butted portion <NUM> of both side edges 11a and 11b. In this context, as for the reinforcing tape <NUM>, the outer polyethylene layer <NUM> and the inner polyethylene layer <NUM> are thicker than the intermediate layer <NUM>, and therefore the outer polyethylene layer <NUM> and the inner polyethylene layer <NUM> are partially extruded toward the lateral side of the intermediate layer <NUM>. As a result extruded portions of the outer polyethylene layer <NUM> and the inner polyethylene layer <NUM> are welded to each other and cover the circumferential end of the intermediate layer <NUM> and welded also to the inner surface of the tube body <NUM>. According to the above described molding procedure, as illustrated in <FIG>, the reinforcing tape portion <NUM> being integrally continuous with both polyethylene layers <NUM> and <NUM> and provided with the cover portion <NUM> covering both side edges of the intermediate layer <NUM> can be easily and reliably formed on the inner surface of the tube body <NUM> along the butted portion <NUM>.

As the above described reinforcing tape <NUM>, a tape having a layer structure including a linear low-density polyethylene layer (<NUM>)/a dry laminate layer (<NUM>)/an aluminum layer (<NUM>)/a dry laminate layer (<NUM>)/a polyethylene terephthalate layer (<NUM>)/a dry laminate layer (<NUM>)/a linear low-density polyethylene layer (<NUM>) and a total thickness of <NUM> (Example <NUM>) or a tape having a layer structure including a linear low-density polyethylene layer (<NUM>)/a dry laminate layer (<NUM>)/an aluminum layer (<NUM>)/a dry laminate layer (<NUM>)/a polyethylene terephthalate layer (<NUM>)/a dry laminate layer (<NUM>)/a linear low-density polyethylene layer (<NUM>) and a total thickness of <NUM> (Example <NUM>) may be used. The reinforcing tape portion <NUM> being integrally continuous with both of the polyethylene layers <NUM> and <NUM> and provided with the cover portion <NUM> covering both side edges of the intermediate layer <NUM> can be reliably constituted by using, as the reinforcing tape <NUM>, the tapes having the above described structure and thickness.

In the molding method illustrated in <FIG>, the color of the outer polyethylene layer <NUM> of the reinforcing tape <NUM> may preferably be different from that of the inner polyethylene layer <NUM> and the intermediate layer <NUM>. In the present embodiment, the polyethylene layer <NUM> and the intermediate layer <NUM> are colored in silver, whereas the outer polyethylene layer <NUM> is colored in white.

In this manner, the outer polyethylene layer <NUM> of the reinforcing tape <NUM> is colored in a color different from that of the inner polyethylene layer <NUM> and the intermediate layer <NUM>, and as a result, in the cover portion <NUM> of the reinforcing tape portion <NUM> after molding, a portion molded by the outer polyethylene layer <NUM> can have a different color from that of the polyethylene layer <NUM> on the side exposed to the inside of the tube body <NUM> and the intermediate layer <NUM> of the reinforcing tape portion <NUM>. Therefore, it can be easily confirmed that the outer polyethylene layer <NUM> is welded and protruded from the intermediate layer <NUM> in an appropriate manner and that both side edges of the intermediate layer <NUM> are reliably covered by the cover portion <NUM> by viewing the tube body <NUM> provided with the reinforcing tape portion <NUM> from inside and recognizing that the cover portion <NUM> has a color different from that of the polyethylene layer <NUM> on the side exposed to the inside of the tube body <NUM> and the intermediate layer <NUM>. In particular, in the case in which the outer polyethylene layer <NUM> is colored in white, reliable covering of both side edges of the intermediate layer <NUM> by the cover portion <NUM> can be confirmed more clearly.

The present disclosure is not limited to the above described embodiment, and may be modified in various manners within the scope not departing from the spirit thereof.

For example, in the above described embodiment, the innermost layer <NUM> and the outermost layer <NUM> of the tube body <NUM> are made of polyethylene. However, they can be made of other resin materials. Further, the resin layer of the reinforcing tape portion <NUM> is also not limited to the polyethylene layers <NUM> and <NUM>, and may be formed of the other resin materials. In this case, the cover portion <NUM> is also not limited to polyethylene, and may be formed of other resin materials similar to those used for the resin layer of the reinforcing tape portion <NUM>.

In the above described embodiment, although one end of the tube body <NUM> is integrally provided with the head <NUM> that includes the shoulder <NUM> and the mouth portion <NUM> and the other end of the tube body <NUM> is crushed flat and closed, this is not restrictive. For example, both ends of the tube body <NUM> may be modified in various manners, and as the head <NUM>, the one having the other shape may be used, for example.

Claim 1:
A laminated tube container (<NUM>) comprising a tube body (<NUM>) that includes a light blocking layer (<NUM>) between an innermost layer (<NUM>) and an outermost layer (<NUM>) made of resin, wherein
the tube body (<NUM>) has:
a butted portion (<NUM>) in which both side edges (11a, 11b) of a laminated sheet (<NUM>) constituting the tube body (<NUM>) are butted against each other; and
a reinforcing tape portion (<NUM>) provided on an inner surface of the tube body (<NUM>) along the butted portion (<NUM>), the reinforcing tape portion (<NUM>) including:
a pair of resin layers (<NUM>, <NUM>); and
an intermediate layer (<NUM>) that includes an aluminum layer (33a) and is disposed between the pair of resin layers (<NUM>, <NUM>),
wherein both sides of the reinforcing tape portion (<NUM>) are provided with a resin cover portion (<NUM>) configured to cover both side edges of the intermediate layer (<NUM>), and characterized by that
a color of the cover portion (<NUM>) is different from a color of the resin layer (<NUM>) on a side exposed to an inside of the tube body (<NUM>) and a color of the intermediate layer (<NUM>).