JP6797394B2 - How to make a container - Google Patents

Description

The present invention relates to a container having a tubular body and a sealing plate for closing the opening thereof, and a method for manufacturing a container having such a structure.

Conventionally, there are cylindrical or polygonal containers made of paper or a thin plastic film. This type of container is used, for example, in the following applications.
(1) Cosmetic packages such as lipstick caps (2) Cups for liquids such as drinks (3) Packages for foods such as confectionery (4) Packages for non-food products such as multicolored pencils

In this type of container, a material having excellent strength such as paperboard is used for the sealing plate that closes the body and the opening thereof that make up the container to protect the contents. Since a paperboard having excellent strength inevitably has a large wall thickness, one of the cross sections is exposed at the joint portion between the body and the sealing plate. If the sealing plate is fitted into the opening of the body, the end face of the body is exposed, and if the sealing plate is put over the opening of the body, the end face of the sealing plate is exposed. Since such exposure of the end face spoils the aesthetic appearance of the container, a container in which the end face of the paperboard is hidden by attaching a thin sheet to the surface of the body and the sealing plate has been proposed. Since the sheet is much thinner than the paperboard, it has the advantage of being inconspicuous even if the end face of the sheet is exposed.

On the other hand, in order to use a container, it is necessary to display a decoration or a product description on the surface of the container in order to enhance the purchasing power of the product or to explain the product inside. In that case, for mass-produced containers, a method such as printing directly on the surface of the paperboard using a dedicated printing machine is adopted. On the other hand, when producing containers with various designs and labels little by little, a thin sheet with the required designs and explanations printed in advance is placed on the surface of the body and sealing plate after the container is assembled. It is pasted by work. As a result, even if the shape and size of the container are different, it is possible to easily manufacture a wide variety of containers without using a dedicated printing machine.

Certainly, the container in which the sheet is attached to the surface of the paperboard as described above has less conspicuous end face than the container with only the paperboard, and is suitable for the production of a small amount of various kinds. However, even if the sheet is thin, there is a problem that the end face of the sheet is exposed at the seam portion and the seam is conspicuous and the aesthetic appearance is spoiled. Further, if the end face of the sheet is exposed at the seam, the fingertip of the user may be caught in the seam and the sheet may be peeled off from the seam.

In order to solve such a problem, for example, the invention of Patent Document 1 is disclosed. In the invention of Patent Document 1, in order to protect the edges of the paper constituting the paper container, the edges are folded back and the edges are wrapped between the papers, or the edges are adhered to the edges including the edges. Is characterized by being exposed to the outside.

JP-A-2009-280238 (page 18, FIG. 2)

However, in the conventional technique as described above, since a portion in which paper is wound or a separately prepared tape is provided at the joint portion between the fuselage and the sealing plate, extra protrusions and members are formed at the joint portion between the fuselage and the sealing plate. It exists and the fuselage and sealing plate cannot be smoothly joined. Therefore, the joint portion between the body and the sealing plate is easily peeled off, and the appearance of the container is spoiled.

An object of the present invention is to provide a container and a method for manufacturing a container having an excellent appearance, in which a thin sheet attached to the surface of a body and a sealing plate is hard to be peeled off from a joint portion.

The container according to the present invention has the following constitution.
(1) A tubular body having an opening, a sealing plate adhered so as to close the opening of the body, an exterior sheet adhered to the body so as to cover the outer surface thereof, and the sealing plate. It is provided with an end sheet, which is adhered to cover the outer surface thereof.
(2) A corner portion is formed on the outside of the joint portion between the body and the sealing plate.
(3) At the end of the exterior sheet and the end of the end sheet, a thin wall portion crushed so that the end side of each sheet becomes thin is formed.
(4) The corner portion is covered from the outside by the exterior sheet and the end sheet in a state where the thin portion of the exterior sheet and the thin portion of the end sheet are overlapped.
(5) The thin portion of the exterior sheet and the thin portion of the end sheet are substantially equal to the thickness of one sheet having no step at the overlapping portion.
(6) The outer surfaces of the exterior sheet covering the corners and the end sheet are arcuate with no steps.

The method for manufacturing a container according to the present invention has the following steps.
(1) A tubular body having an opening, a sealing plate adhered so as to close the opening of the body, and an exterior sheet adhered to the body so as to cover the outer surface thereof are provided with the body. Prepare a container in which corners are formed on the outside of the joint portion of the sealing plate, and an end sheet having the same shape as the outer circumference of the fuselage and having a thermoplastic adhesive layer formed on the sealing plate side is not attached. To do.
(2) It has an inner diameter into which the body to which the exterior sheet is adhered is fitted, has a pressed surface shaped along the surface of the sealing plate, and has an arcuate corner at the joint between the body and the sealing plate. A mold is used that includes a concave mold and a convex mold that has an outer shape that fits inside the body and has a pressed surface that is shaped along the inner surface of the sealing plate.
(3) With the end sheet overlapped with the outer surface of the sealing plate, the body and the sealing plate are pressurized and heated from inside and outside by the concave and convex shapes.
(4) By bringing the concave shape and the convex shape close to each other, the end face of the end sheet and the end face of the exterior sheet are pressed by the concave arc-shaped corners, and the outer surfaces of both are pressed against the arc-shaped corners. While curving along, the ends of both overlap.
(5) The concave and convex shapes pressurize the overlapping ends of the end sheet and the exterior sheet to form a thin-walled portion that is crushed so that the end side of each sheet becomes thin, and seals with the body. The outer surface of the exterior sheet covering the corners of the plate and the outer surface of the end sheet are formed in an arc shape with no steps.

An exploded perspective view of the container according to the first embodiment. Sectional drawing of the container which concerns on 1st Embodiment An enlarged cross-sectional view showing a joint state of the end sheet and the exterior sheet in the first embodiment. Sectional drawing explaining the manufacturing method of the container which concerns on 1st Embodiment Sectional view of the container according to another embodiment

[1. First Embodiment]
[1-1. Constitution]
Hereinafter, the configuration of the container according to the first embodiment will be described with reference to FIGS. 1 to 3. The container of this embodiment is used as a cap for a lipstick container.

As shown in FIG. 1, as an example, the container 1 includes a body 2, a sealing plate 3, an exterior sheet 5, and an end sheet 6. The body 2 is a cylindrical member made by stacking paperboards in a spiral shape.

As shown in FIG. 2, the sealing plate 3 is made of paperboard like the body 2, and in the present embodiment, the two paperboards are laminated. The sealing plate 3 is adhered in a state of being fitted inside the end portion of the body 2, and seals the end portion of the container 1. Since the sealing plate 3 is fitted inside the body 2, it is fixed to the end of the body 2 in a so-called flush state without unevenness. That is, at the end portion of the container 1, the outer surface of the sealing plate 3 and the end surface of the paperboard constituting the body 2 are exposed flush with each other, and the corner portion 11 is formed. As an example, the bonding between the body 2 and the sealing plate 3 is a thermoplastic adhesion applied from the inside of the body 2 to a corner formed by an inner surface of the body 2 and an end portion of the inner surface of the sealing plate 3. It is done by agent 32.

The exterior sheet 5 is made of thin paper having a thickness smaller than that of paperboard, and is adhered to the periphery of the body 2. A film-like adhesive is attached or applied to the surface of the exterior sheet 5 in contact with the body 2. On the exterior sheet 5, a product name, a trademark, a trade name, etc. representing the contents and a drawing for improving the aesthetic appearance of the container are printed. The exterior sheet 5 is fixed so as to cover the entire or a part of the outer periphery of the body 2. The end portion of the exterior sheet 5 is fixed flush with respect to the end portion of the body 2.

The end sheet 6 is made of a thin paper similar to the exterior sheet 5, and is adhered to the outer surface of the end portion of the sealing plate 3 and the body 2. The end sheet 6 has an external dimension slightly larger than the dimension of the end portion of the body 2 including the thickness dimension of the exterior sheet 5. A film-like adhesive is attached or applied to the inner surface of the end sheet 6, that is, the surface in contact with the ends of the sealing plate 3 and the body 2. With this adhesive, the end sheet 6 is adhered to the ends of the sealing plate 3 and the body 2. Similar to the exterior sheet 5, the end sheet 6 is printed with a product name, a trademark, a trade name, etc. representing the contents and a drawing for improving the aesthetic appearance.

As shown in FIG. 3, a thin portion 51 whose cross section is crushed into a triangular shape so that the end side of each of the sheets 5 and 6 becomes thin at the end of the exterior sheet 5 and the end of the end sheet 6. , 61 are formed. The corner 11 of the container is covered from the outside by the exterior sheet 5 and the end sheet 6 in a state where the outer thin portions 51 and 61 are overlapped. The outer surfaces of the exterior sheet 5 and the end sheet 6 covering the corners 11 are arcuate with no steps.

[1-2. Production method]
The method for manufacturing the container of the present embodiment having the above-described configuration will be described with reference to FIG.

(1) Mold to be used In the manufacturing method of the present embodiment, two molds, a concave mold 7 and a convex mold 8, are used. The concave shape 7 has an inner wall having the same shape as the outer peripheral surface of the container 1, and a bottom having the same shape as the end of the container 1 formed by the outer surface of the sealing plate 3 and the end of the body 2. The inner diameter of the concave mold 7 is slightly larger than the outer diameter of the container 1 to which the exterior sheet 5 is attached, and the container 1 can be inserted and pulled out into the concave mold 7. The depth of the concave mold 7, that is, the height of the inner wall, is such that when the end sheet 6 and the end portion of the container 1 on the sealing plate 3 side are fitted into the concave mold 7, the end sheet 6 and the container 1 are positioned from the concave mold 7. It has a depth that does not shift, for example, a dimension equal to or larger than the thickness of the sealing plate 3.

The corners of the inner wall and the bottom of the concave shape 7 are arcuate. The radius of the arc is less than the thickness of the body 2 and the sealing plate 3 and larger than the thickness of the exterior sheet 5 and the end sheet 6. The bottom portion of the concave mold 7 and the corner portion on the arc are the press surfaces of the claims.

The convex shape 8 is fitted into the inside of the body 2 so that it can be inserted and pulled out, and its external dimensions are equal to the dimensions of the inner peripheral surface of the body 2, but it has a margin for insertion and removal. The height of the convex shape 8 is larger than the height of the body 2. The corners of the outer wall and the bottom of the convex 8 are arcuate, and the radius of the arc is smaller than the radius of the arc at the corners of the concave 7. The bottom and corners of the convex shape 8 are the press surfaces of the claims.

The concave mold 7 is installed on a fixed table, and the convex mold 8 is raised and lowered by a press device (not shown). The press device pressurizes the container 1 set between the two from above and below, and has the pressing force required to crush the outer sheet 5 and the end sheet 6 by the pressing force to form the thin-walled portions 51 and 61. .. The concave type 7 and the convex type 8 include a heater for heating. The heater heats the concave 7 and the convex 8 to a temperature at which the thermoplastic adhesive provided on the exterior sheet 5 and the end sheet 6 to be pressurized are melted.

(2) Untreated container In order to manufacture the container of the present embodiment using the above-mentioned mold, first, an untreated container to which the end sheet 6 is not attached is prepared. The untreated container is manufactured, for example, as follows.
(a) The exterior sheet 5 is adhered around the body 2. The exterior sheet 5 is fixed so as to overlap with the end portion 21 of the body 2 in a state where there is no unevenness, that is, a so-called flush state. Since an adhesive (not shown in the figure) is attached or applied to the surface of the exterior sheet 5 in contact with the body 2, the exterior sheet 5 is adhered to the outer surface of the body 2 with this adhesive.
(b) The sealing plate 3 is fitted inside the opening of the body 2 so that the end portion of the body 2 and the outer surface of the sealing plate 3 are flush with each other.
(c) An adhesive supply nozzle is inserted inside the body 2, and the inner surface of the body 2 and the inner surface end of the sealing plate 3 are bonded by the adhesive supplied from the nozzle.

In (a) to (c) above, the exterior sheet 5 was attached to the body 2 after the sealing plate 3 was adhered to the body 2, but the exterior sheet 5 was adhered to the body 2 and then cut, and the inside of the body 2 was cut. The sealing plate 3 may be adhered to.

(3) Adhesion Step of End Sheet 6 (3-1) Setting of End Sheet 6 The end sheet 6 having an adhesive layer formed on one side is set in the concave mold 7 with the adhesive layer facing up. Since the end sheet 6 has a diameter equal to the inner diameter of the concave shape 7, the outer peripheral portion of the end sheet 6 is microscopically placed on the corner portion on the arc of the concave mold 7.

(3-2) Setting of untreated container The untreated container is fitted to the outside of the convex mold 8 with the sealing plate 3 facing downward, and the sealing plate 3 and the end sheet 6 are overlapped with each other. In this case, since the end sheet 6 has an external dimension slightly larger than the dimension of the end portion of the body 2 including the thickness dimension of the exterior sheet 5, the end sheet 6 is positioned to cover the end surface of the exterior sheet 5. ..

(3-3) Pressurization / heat treatment by concave mold 7 and convex mold 8 The convex mold 8 is inserted onto the end sheet 6 set in the concave mold 7. Since the corners between the outer wall and the bottom of the convex shape 8 are arcuate, the convex shape 8 can be smoothly inserted into the body 2. In this state, when the convex mold 8 is brought closer to the concave mold 7, the end face of the end sheet 6 and the end face of the exterior sheet 5 are pressed by the arcuate corners of the concave mold 7, and the outer surfaces of both are the concave mold 7. It is curved along the arcuate corners. In this case, since the end sheet 6 is positioned to cover the end face of the exterior sheet 5, both ends overlap each other so that the end sheet 6 comes to the outside of the exterior sheet 5.

Further, when the pressurization is continued by the concave mold 7 and the convex mold 8, thin-walled portions 51 and 61 are formed in the overlapping portion of the end sheet 6 and the exterior sheet 5 so that the end side is thinned. At the same time, the outer surfaces of the exterior sheet 5 covering the corners of the body 2 and the sealing plate 3 and the end sheet 6 are formed in an arc shape without a step.

In this state, by heating the molds of both the concave mold 7 and the convex mold 8 or one of them, the adhesive layer of the end sheet 6 is heated and melted, and the end sheet 6 is pressed into the sealing plate 3 and It is adhered to the end of the body 2 and the end of the exterior sheet 5. In this way, after forming the outer surfaces of the exterior sheet 5 and the end sheet 6 covering the corners of the body 2 and the sealing plate 3 into an arc shape without a step as shown in the enlarged view of FIG. Raises the convex mold 8 and takes out the container 1 to which the exterior sheet 6 is adhered from the concave mold 7.

[1-3. effect]
The effects of the present embodiment having the above configuration are as follows.

(1) At the end of the exterior sheet 5 and the end of the end sheet 6, thin-walled portions 51 crushed so that the end side of each sheet becomes thin is formed, and the thin-walled portions 51 and 61 of the exterior sheet 5 are formed. The corners are covered from the outside by the exterior sheet 5 and the end sheet 6 in a state where the thin portion 61 of the end sheet 6 is overlapped. Therefore, the outer surfaces of the exterior sheet 5 and the end sheet 6 covering the corners are arcuate with no steps. As a result, the joint between the exterior sheet 5 and the end sheet 6 is inconspicuous, and the shape is as if one sheet is continuous, and the aesthetic appearance of the container 1 is improved.

(2) Thin-walled portions 51 and 61 are formed by pressurization in the overlapping portion of the exterior sheet 5 and the end sheet 6, and the thickness is substantially equal to the thickness of one sheet, and the end of the end sheet 6 is the exterior sheet. Since it is joined in a form integrated with 5, the joint between the two is hard to peel off.

(3) Since the end sheet 6 overlaps the outside of the exterior sheet 5, the seams are hardly visible when the container is viewed from above, the seams are arcuate, and pressure is applied. In combination with the fact that there is no step, the integration of both seats is more effectively demonstrated.

(4) Since the sealing plate 3 is fitted inside the opening of the body 2 and the outer surface of the sealing plate 3 and the end surface of the body 2 are arranged flush with each other, the sealing plate 3 makes the body 2 from the inside. It will be reinforced, and the strength of the container 1 in the radial direction is high. Since the body 2 has a tubular shape, its strength in the axial direction is high, and the two together form a container with high strength.

(5) By using a mold having arcuate corners, the corners of the container 1 and the overlapping portion of the exterior sheet 5 and the end sheet 6 can be deformed into an arc shape by a simple process. ..

(6) By pressurizing and heating the end sheet 6 on which the thermoplastic adhesive layer is formed by the concave 7 and the convex 8 in a state where the end sheet 6 is superposed on the untreated container, a circle having no step with the thin portion is formed. The formation of the arc-shaped outer surface and the adhesion of the end sheet 6 can be performed by a single pressurization and heat treatment, so that the container can be easily manufactured and a low-cost container can be provided.

[2. Other embodiments]
Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, as well as in the scope of the invention described in the claims and the equivalent scope thereof. The following is an example.

(1) The exterior sheet 5 may be adhered to the outer surface of the body 2 before fixing the sealing plate 3 to the opening of the body 2, or the body after fixing the sealing plate 3 to the tubular body 2. It may be adhered to the outer surface of 2. After the wide exterior sheet 5 is attached to the long paper tube, the paper tube is cut according to the length of the container, so that the attachment work of the exterior sheet 5 can be simplified.

(2) Although the sealing plate 3 is made by laminating two paperboards, the number of paperboards is not limited to two, and one or three or more paperboards may be used. Further, although the sealing plate 3 has a flat plate shape, it may be a plate-shaped member having a hemispherically curved central portion or a polygonal dome-shaped member.

(3) The sealing plate 3 and the end sheet 6 are provided at one end of the body 2, but may be provided at both ends. In that case, a container outlet is provided at the center of the body 2. Can be done. The container 1 may have a sealing plate and an end sheet at the bottom of the body 2, or may have a sealing plate and an end sheet at the top of the body 2 like the lid of a container. May be good. The container 1 has a cylindrical shape, but may be a polygon such as a triangle or a quadrangle.

(4) The body 2 is a cylindrical paperboard made by stacking cardboard in a spiral shape, but as long as the exterior sheet 5 is attached, the material is not limited and it is molded from plastic such as styrene. It may be a cylindrical tube.

(5) The adhesive is a thermoplastic adhesive, but other than the adhesive layer of the end sheet 6, an adhesive adhesive or other adhesive may be used.

(6) The sealing plate 3 is inserted inside the body 2, but may be adhered to the outside of the end portion of the body 2 as shown in FIG. Further, the paperboard inserted inside the body 2 and the paperboard adhered to the outside of the end portion of the body 2 may be overlapped. In that case, since the joint between the body 2 and the sealing plate 3 does not appear on the end face portion of the container, there is an advantage that the end face portion can be easily flattened.

1 Container 2 Body 3 Sealing plate 5 Exterior sheet 6 End sheet 7 Concave type 8 Convex type

Claims (4)

A tubular body having an opening, a sealing plate adhered so as to close the opening of the body, an exterior sheet adhered to the body so as to cover the outer surface thereof, and an outer surface thereof attached to the sealing plate. With an end sheet, which is glued to cover the
Corners are formed on the outside of the joint between the fuselage and the sealing plate.
At the end of the exterior sheet and the end of the end sheet, a thin wall portion crushed so that the end side of each sheet becomes thin is formed.
In a state where the thin portion of the exterior sheet and the thin portion of the end sheet are overlapped, the corner portion is covered from the outside by the exterior sheet and the end sheet.
The thin portion of the exterior sheet and the thin portion of the end sheet have overlapping portions that are substantially equal to the thickness of one sheet having no steps.
A container in which the outer surface of the exterior sheet covering the corner portion and the outer surface of the end sheet have an arc shape with no step. The container according to claim 1, wherein the end sheet overlaps the outside of the exterior sheet. The container according to claim 1 or 2, wherein the sealing plate is fitted inside the opening of the body, and the outer surface of the sealing plate and the end surface of the body are arranged flush with each other. The body and the sealing plate are provided with a tubular body having an opening, a sealing plate adhered so as to close the opening of the body, and an exterior sheet adhered to the body so as to cover the outer surface thereof. Prepare a container in which corners are formed on the outside of the joint portion of the fuselage, and an end sheet having the same shape as the outer circumference of the fuselage and having a thermoplastic adhesive layer formed on the sealing plate side is not attached .
A concave shape that has an inner diameter into which the body to which the exterior sheet is adhered is fitted, has a pressed surface shaped along the surface of the sealing plate, and has an arcuate corner at the joint between the body and the sealing plate. Use a mold with an outer shape that fits inside the fuselage and a convex mold with a pressed surface shaped along the inner surface of the sealing plate.
With the end sheet superposed on the outer surface of the sealing plate, the body and the sealing plate are pressurized and heated from inside and outside by the concave and convex shapes.
By bringing the concave shape and the convex shape close to each other, the end face of the end sheet and the end face of the exterior sheet are pressed by the concave arc-shaped corner portion, and the outer surfaces of both are pressed along the arc-shaped corner portion. While bending, overlap the ends of both,
With the concave and convex shapes, the overlapping ends of the end sheet and the exterior sheet are pressed to form a thin wall portion that is crushed so that the end side of each sheet becomes thin, and the corners of the body and the sealing plate are formed. A method for manufacturing a container in which an exterior sheet covering a portion and an outer surface of the end sheet are formed in an arc shape without a step.

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