WO2005108228A1

WO2005108228A1 - Pouring spout for container and container with pouring spout

Info

Publication number: WO2005108228A1
Application number: PCT/JP2004/006519
Authority: WO
Inventors: Shigeto Nishida
Original assignee: Showa Marutsutsu Co. Ltd.
Priority date: 2004-05-07
Filing date: 2004-05-07
Publication date: 2005-11-17

Abstract

A pouring spout for container is made of thermosetting plastic and has a to-be-sealed surface at the opening of a bag-like container body made of a laminated film having a barrier layer and an innermost sealant layer. A protrusion and recess section is formed and distributed on the entire surface of the to-be-sealed surface, and differences in height in the protrusion and recess section are set smaller than the thickness of the sealant layer. With such a pouring spout, high adhesion to the opening of the container body is attained, ensuring excellent sealing ability, and damage to the barrier layer of the laminate film can be reduced or eliminated during or after heat-sealing, so that barrier properties of the laminate film is not impaired.

Description

Description Spout for container and container with the same

The present invention relates to a container in which a spout for inserting and removing contents is attached to an opening of a container body made of a laminated film, and more particularly, to a container in which a laminated film constituting a container body includes a barrier layer. Things. Background art

As a container for filling soft drinks, liquids such as shampoos, and powders such as seasonings, high-density material is placed at the opening of the container body made of a laminated film mainly made of plastic, such as a voucher. It is known that an outlet made of a thermoplastic such as polyethylene is heat-sealed.

In the above-mentioned container, various measures have been devised for the sealing structure of the outlet to the opening of the container body in order to ensure the sealing performance.

FIG. 14 shows a conventional container spout described in Japanese Patent Application Laid-Open Publication No. 2000-333064. The spout (100) in FIG. 14 is applied with heat by applying the sealant surface of the laminated film to the sealed surface (108a) constituted by the surface of the base (108). It is bonded to the opening of the container body (110) made of a laminated film. On the sealed surface (108a) of the spout (100), a ridge G08b) is provided to ensure liquid tightness of the container. That is, when the laminated film constituting the container body (110) is overlaid on the surface to be sealed (108a), and the heated seal bar is pressed from above the film, the heat and pressure caused by the heat are applied to the ridge a08b). It concentrates and the ridge (108b) melts and adheres tightly to the sealant layer of the laminated film, thus ensuring liquid-tightness. The ridge (108b) has a height of about 3 mm and a width of 0.4 to 0.5 mm, for example.

In addition to the above-mentioned documents, as documents for describing a configuration such as a ridge as a means for obtaining a good sealing structure of a container spout, for example, Japanese Patent Application Laid-Open No. H10-219130, Japanese Patent Application Laid-Open No. Hei 10-1296989, Japanese Patent Laid-Open No. 2000-259798 , JP-A-2002-96846, JP-A-2000-281092,

2002-104453, JP-A-10-1 52153, JP-A-11

Japanese Patent Laid-Open No. 189248, Japanese Patent Laid-Open No. 11-189247, and Japanese Utility Model Registration No. 3038175.

As described above, the conventional container spout is provided with a ridge (108b) on the surface to be sealed a08a) in order to surely perform heat sealing with the opening of the container body (110). However, the projections (108b) may damage the laminated film constituting the container body αΐθ).

The laminated film is provided with a barrier layer made of aluminum foil or the like in order to suppress the permeation of oxygen and moisture. However, cracks occur in this barrier layer due to damage caused by the ridges (108b). This causes problems such as impaired barrier properties and edge cuts, which lowers the yield rate.

As described in JP-A-2000-335604, in the case of a container whose spout is opened and closed by a screw cap, stress is generated in the spout when the screw cap is opened and closed, As a result, the cracks in the barrier layer may be extended. In the case where the spout is a container that is closed by forcible fitting of the stopper, a larger stress is generated in the spout when the stopper is opened and closed, so that the cracks in the parier layer are more easily extended. .

In particular, when the thickness of the laminated film is reduced, the thickness of the barrier layer is also reduced, and the above-described problem is likely to occur. Disclosure of the invention

The present invention has been made in order to solve the above problems, and it is possible to ensure excellent sealing performance by being strongly heat-sealed at an opening of a container body made of a laminated film. An object of the present invention is to provide a container spout that does not damage the laminated film constituting the container main body at the time of heat sealing or after the heat sealing and impairs the barrier property of the laminated film.

The container spout according to the present invention is a thermoplastic plastic, and is provided with an opening at the opening of a bag-shaped container body made of a laminated film having a barrier layer and an innermost sealant layer. -In the case where the surface to be sealed is provided, an uneven portion is formed on the surface to be sealed so as to be distributed over the entire surface, and the height difference of the uneven portion is made smaller than the thickness of the sealant layer. It is characterized by:

According to the container spout described above, by forming an uneven portion on the surface to be sealed so as to be distributed over the entire surface, a high adhesive strength is obtained with respect to the opening of the container main body, thereby providing excellent sealing performance. In addition, by making the height difference between the uneven portions smaller than the thickness of the sealant layer, the uneven portions can reduce or eliminate damage to the barrier layer of the laminated film during or after heat sealing. However, the barrier properties of the laminated film are not impaired.

In the container spout according to the present invention, the uneven portion may be formed by applying a satin finish pattern to the surface to be sealed.

If the irregularities on the surface to be sealed are formed in a satin pattern, small irregularities will be distributed around the large irregularities, so that air escape during heat sealing will be good.

Further, in the container spout according to the present invention, the uneven portion has a plurality of at least one end extending to the end of the sealed surface and having a depth smaller than a thickness of the sealant layer. It may be formed by forming a concave groove.

In the case described above, the air can be satisfactorily removed at the time of heat sealing through the concave groove, and the area of the upper surface of the convex portion can be easily controlled, and the setting of the adhesive force can be easily performed.

In the container spout according to the present invention, more preferably, the height difference of the concave-convex portions is smaller than half the thickness of the sealant layer.

According to the above, it is possible to more reliably reduce or eliminate the damage caused by the uneven portions to the barrier layer of the laminated film during or after heat sealing. The present invention also includes a container. In this container, the surface to be sealed of the container spout according to the present invention described above is heat-sealed at the opening of the container body made of a laminated film having a barrier layer and an innermost sealant layer. is there.

According to the container described above, the sealing portion between the spout and the opening of the container body is excellent. In addition to providing high sealing performance, the unevenness of the surface to be sealed at the spout reduces or eliminates damage to the barrier layer of the laminated film during heat sealing or after heat sealing. Can be favorably maintained.

In the container according to the present invention, the barrier layer may be, for example, an aluminum foil layer having a thickness of 7 to 15 / m, a vapor deposition barrier layer having a thickness of 1 m or less, and a plastic coating having a thickness of 10 or less. It consists of one of the barrier layers. The deposition barrier layer is formed by depositing silica, alumina, aluminum, or the like in angstrom units. The thickness of the deposited barrier layer is typically between 600 and 100 Angstroms. Examples of the plastic constituting the coating barrier layer include acrylic copolymer and polyvinyl alcohol.

In the case of the container of the present invention, the barrier layer of the laminated film constituting the container body is made to be a thin layer as described above, since the damage caused by the uneven portion of the surface to be sealed of the spout is extremely small or not present. It is possible to make the laminated film thinner. Brief Description of Drawings

1 to 4 show a first embodiment of the present invention. FIG. 1 is a front view of a container spout, FIG. 2 is a side view, and FIG. 3 is a line III-III in FIG. FIG. 4 is a plan view.

FIG. 5 is a graph for explaining the shape of the sealed surface of the spout.

6 and 7 show a step of heat-sealing the spout to the opening of the container body according to the first embodiment. FIG. 6 is a cross-sectional view of a state at the time of heat sealing, and FIG. It is sectional drawing of a state after.

Figs. 8 and 9 show the process of heat sealing the conventional container spout to the opening of the container body. Fig. 8 is a cross-sectional view of the state at the time of heat sealing, and Fig. 9 is a heat seal. It is sectional drawing of a state after.

FIGS. 10 and 11 show a second embodiment of the present invention. FIG. 10 is a front view of a container spout, and FIG. 11 is a side view.

FIGS. 12 and 13 show a third embodiment of the present invention. A front view of the container spout, and FIG. 13 is a side view.

FIG. 14 is a perspective view of a conventional container spout. BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment)

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a front view of a bouch spout (1) according to the first embodiment, FIG. 2 is a side view, FIG. 3 is a cross-sectional view taken along the line II-II of FIG. 1, and FIG. 4 is a plan view. The spout (1) shown in these figures is formed entirely of a thermoplastic body such as high-density polyethylene resin, and is formed from a base (2) and an upper end from the upper end of the base (2). And an extending pouring part (3).

The base (2) includes a cylindrical wall (21) and a reinforcing wall (22) that protrudes outward from both left and right portions of the outer surface of the cylindrical wall (21). As shown in FIG. 3, the reinforcing wall portion (22) has a wedge-shaped horizontal cross section whose thickness decreases as the distance from the cylindrical wall portion (21) increases. Therefore, the outer surface of the base (2) has a canoe-shaped contour shape, and this surface constitutes a sealed surface (2a) to be heat-sealed to the opening of the container body (110) made of the laminated film.

The pouring section (3) has a cylindrical shape, and the inside thereof communicates with the inside of the cylindrical wall section (21) of the base section (2). The inside of the pouring section (3) and the inside of the cylindrical wall section (21) forms a conduction path (4) through which the liquid or powder as the contents of the container flows. A male screw part (31) into which a screw cap (not shown) is screwed is formed at the upper part of the outer peripheral surface of the pouring part (3).

At the lower end of the outer peripheral surface of the pouring portion (3), a flat first elliptical portion (5) having an elliptical shape slightly longer to the left and right as viewed from the plane is formed. On the upper surface of the reinforcing wall portion (22) of the base portion (2), portions other than the left and right ends are integrated with the lower surface of the first flange portion (5). The first flange portion (5) serves as a positioning reference for the laminated film to be heat-sealed to the surface to be sealed (2a) of the base portion (2).

In addition, a second flange portion (6) having substantially the same shape and the same size as the first flange portion (5) is formed at an intermediate height of the outer peripheral surface of the pouring portion (3). An annular convex portion (3) is provided at the portion between the first flange portion (5) and the second flange portion (6) on the outer peripheral surface of the pouring portion (3) and at a portion slightly above the second flange portion (6). 7) (8) is formed.

On the outer surface of the base (2), that is, on the surface to be sealed (2a), an uneven portion (9) is formed over the entire surface. In this embodiment, the concavo-convex portion (9) is formed by applying a satin pattern to the surface to be sealed (2a).

FIG. 5 shows the shape of the uneven portion (9) formed on the surface to be sealed (2a). The horizontal axis in FIG. 5 indicates the length, and its .1 scale is 0.5 mm. The vertical axis in FIG. 5 indicates the height, and one scale is 10 m. The satin pattern is formed, for example, so that the height of the convex portion is about 18 m at the maximum. The height difference of the uneven portion (9) is about 18 m.

Next, referring to FIGS. 6 to 9, the step of heat sealing the spout (1) of the above embodiment to the opening of the container body (110) and the sealing structure obtained thereby will be described by using a conventional spout ( This is explained in comparison with the case of using (100).

FIG. 6 conceptually shows a state in which the spout (1) of the above embodiment is heat-sealed to the opening of the container body (110). Reference numeral (105) indicates a convex portion among the concave and convex portions formed on the surface to be sealed (2a) of the base portion (2). The laminated film (130) composing the container body (110) is, for example, a linear low-density 40 m thick composing the sealant layer from the side closer to the base (2) of the spout (1). It is composed of a polyethylene layer (131), an aluminum foil layer (132) with a thickness of 7 m serving as a barrier layer, and a polyethylene terephthalate layer (133) with a thickness of 12 m serving as a protective layer. In some cases, a nylon layer is interposed between the linear low-density polyethylene layer (131) and the aluminum foil layer (132). The thickness of the linear low-density polyethylene layer (131) constituting the sealant layer is preferably from 40 m to 180 m. On the surface of the base (2), that is, on the surface to be sealed (2a), a laminated film (130) constituting the container body (110) is placed with the linear low-density polyethylene layer α31) inside. I will

In the heat sealing, for example, a seal bar (not shown) heated to about 165 is attached to the surface to be sealed (2a) of the base (2) and the laminated film (130) superimposed on the film (130). 130) By pressing from above the polyethylene terephthalate layer Q 33) Done. This melts the innermost linear low-density polyethylene layer (131) of the laminated film (130), and seals the surface (2a) of the spout (1) made of high-density polyethylene with a higher melting point. ) Is melted, and the surface to be sealed (2a) and the linear low-density polyethylene layer Q31) of the laminated film (130) are integrated. Here, since the uneven surface (9) having a height difference smaller than the thickness of the sealant layer (131) is formed on the entire surface to be sealed (2a), the aluminum of the laminated film (130) is formed. Causes little or no damage to the foil layer. Thus, as shown in FIG. 7, the sealed surface (2a) of the spout (1) is heat-sealed at the opening of the container body (110) made of the laminated film (130).

FIG. 8 conceptually shows a state in which the conventional spout (100) is heat-sealed into the opening of the container body (110) (see FIG. 14). A protrusion (108b) is formed on the surface of the base (108), that is, on the surface to be sealed (108a). The ridge (108b) has a height of about 0.3 mm and a width of 0.4 to 0.5 mm.

In the same manner as above, heat sealing is performed by pressing a seal bar heated to about 165 ° C against the surface to be sealed (108a) of the base (108) and the laminated film (130) superposed thereon. Is As a result, the innermost linear low-density polyethylene layer (131) of the laminated film (130) melts, and the ridges (108b) formed on the sealed surface (108a) of the spout (100) are removed. The molten surface (108a) is integrated with the linear low-density polyethylene layer (131) of the laminated film (130). Here, the ridge (108b) formed on the surface to be sealed (108a) has a height much larger than the thickness of the linear low-density polyethylene layer (131). The aluminum foil layer (132) of the film (130) is damaged.

Thus, as shown in FIG. 9, the surface to be sealed (108a) of the base 08) of the spout (100) is heat-sealed to the opening of the container body (110) composed of the laminated film (130).

As can be seen by comparing FIG. 7 and FIG. 9, in the conventional sealing structure of the spout (100), the surface to be sealed (108a) after heat sealing has large irregularities, and the tip of the ridge (108b) and the aluminum The linear low-density polyethylene layer (131) is not interposed at all between the two-layer foil layer (132) or the thickness thereof is extremely small. The barrier layer (132) of the film (130) is easily damaged. On the other hand, In the sealing structure of the spout (1) according to the embodiment, the unevenness of the surface to be sealed (2a) after the heat sealing is small, and therefore, there is no direct contact between the tip of the projection (105) and the aluminum foil layer (132). Since the thickness of the chain low-density polyethylene layer (131) is sufficiently large, damage to the aluminum foil layer (132) is reduced.

In order to further reduce the damage to the aluminum foil layer Q32), the height difference of the uneven portion (9) of the surface to be sealed (2a) before the heat seal is smaller than 20 m. Preferably, it is smaller than one half of the thickness of the sealant layer (131). (Second embodiment)

In the first embodiment, the uneven surface (9) is formed by applying a satin pattern to the surface of the base (2) of the spout (1), that is, the surface to be sealed (2a). As shown in FIG. 11, the concave and convex portions (9) may be formed on the surface to be sealed (2a) by forming a plurality of concave grooves (50). The concave groove (50) is formed so that at least one end thereof extends to the end of the surface to be sealed (2a). Thereby, at the time of heat sealing, it is possible to prevent air from remaining without escaping from between the laminated film (130) and the surface to be sealed (2a) of the base (2).

The concave groove (50) is formed so as to extend in the left-right direction orthogonal to the axial direction of the cylindrical wall (21) of the base (2). In this case, if the laminated film (130) shown in FIGS. 6 and 7 is used in order to reduce damage to the barrier layer of the laminated film, the depth of the concave groove (50) is It is preferable that the thickness is less than 40 m, which is the thickness of 131), and it is more preferable that the thickness is less than 20 m, which is half the thickness of the sealant layer (131).

The width of the groove (50) and the number of grooves per unit length are appropriately set according to the specifications of the product in relation to the material of the sealant layer (131) and the adhesive strength. If the depth of (50) is 15 zm, the width is 30 m and the number per unit length is 10 lines / cm.

(Third embodiment)

In the second embodiment, the concave groove (50) is formed so as to extend in the left-right direction orthogonal to the axial direction of the cylindrical wall portion (21) of the base (2), as shown in FIG. 12 and FIG. As seen from the front, the concave groove (60) is at an angle of 45 degrees with the axial direction of the cylindrical wall (21). By forming so as to have an inverted V shape, the uneven portion (9) may be formed on the surface of the base portion (2), that is, on the surface to be sealed (2a). The concave groove (60) is formed so that at least one end extends to the end of the surface to be sealed (2a). Assuming that the laminated film (130) shown in FIGS. 6 and 7 is used, the depth of the groove (60) is preferably smaller than 40 m which is the thickness of the sealant layer (131). It is preferable to be shallower than 20 m, which is one half of the thickness of (131). As a result, the same effects as in the second embodiment can be obtained.

Claims

The scope of the claims

1. A bag-shaped container made of a laminated film having a barrier layer and an innermost sealant layer. At a spout for a container made of thermoplastic plastic, which has a surface to be sealed which is heat-sealed at the opening of the main body,

An uneven portion is formed on the surface to be sealed so as to be distributed over the entire surface, and a height difference of the uneven portion is smaller than a thickness of the sealant layer.

2. The container spout according to claim 1, wherein the uneven portion is formed by applying a satin pattern to the surface to be sealed.

3. The uneven portion is formed on the surface to be sealed by forming a plurality of concave grooves having at least one end extending to an end of the surface to be sealed and having a depth smaller than the thickness of the sealant layer. The spout for containers according to claim 1, characterized in that:

4. The container spout according to any one of claims 1 to 3, wherein a height difference of the uneven portion is smaller than a half of a thickness of the sealant layer.

5. The surface to be sealed of the spout according to any one of claims 1 to 4 is heat-sealed at the opening of the container body made of a laminated film having a barrier layer and an innermost sealant layer. A container.

6. The barrier layer comprises one of an aluminum foil layer having a thickness of 7 to 15 ^ m, a vapor deposition barrier layer having a thickness of lm or less, and a plastic coating barrier layer having a thickness of 10 m or less. The container according to claim 5, characterized in that: