JP7391480B2 - laminated peel container - Google Patents

Description

The present invention relates to a laminated and peelable container made of synthetic resin.

As a container made of synthetic resin for storing contents, it has a cylindrical mouth portion with an outside air introduction hole, a shoulder portion connected to the mouth portion whose diameter gradually increases downward, a body portion connected to the shoulder portion, and a body portion connected to the shoulder portion. an outer layer body having a bottom portion that closes the lower end portion; an inner layer body that is laminated inside the outer layer body and is deformable for volume reduction; and an inner layer body that extends along the axial direction between the outer layer body and the inner layer body. and an adhesive band for bonding the outer layer body and the inner layer body together, and as the contents are poured out, outside air is introduced between the outer layer body and the inner layer body from the outside air introduction hole to maintain the shape of the outer layer body. A laminated peelable container is known in which only the inner layer is deformed to reduce its volume, so that the contents can be poured out without replacing the contents with outside air.

In addition, in order to give the container a sleek and aesthetic appearance as a laminated peelable container used to store contents such as cosmetics, the R It is known that the chamfer has a so-called anchor shoulder shape in which the chamfer extends radially outward from the upper end of the body (for example, see Patent Document 1).

Japanese Patent Application Publication No. 2020-19522

Laminated containers are typically formed by blow molding. In this case, after blow molding, the inner layer is peeled off from the outer layer by sucking out the internal air from the mouth to reduce the pressure, and then the inner layer is removed by filling air into the inner layer from the mouth. By performing an initial peeling process to restore the body to its original state, the inner layer is smoothly peeled off from the outer layer during use, that is, when the contents of the container are poured out from the inner layer.

However, in the above-mentioned conventional anchor shoulder-shaped laminated peelable container, the inner layer is difficult to peel off from the outer layer, especially at the edge of the adhesive band at the R-chamfered portion, and when the inner layer is peeled off from the outer layer, the inner layer is difficult to peel off from the outer layer. Another problem is that there is a risk that damage such as pinholes may occur in the inner layer.

It is an object of the present invention to solve these problems, and its purpose is to enable smooth peeling of the inner layer from the outer layer at the edge of the adhesive band at the R-chamfered portion. An object of the present invention is to provide a laminated peelable container having an anchor shoulder shape.

The laminated peelable container of the present invention includes a cylindrical mouth portion having an outside air introduction hole, a shoulder portion connected to the mouth portion and gradually increasing in diameter downward, a body portion connected to the shoulder portion, and a lower end of the body portion. an outer layer body having a bottom portion that closes the outer layer body, an inner layer body that is laminated inside the outer layer body and is deformable for volume reduction, and an inner layer body that extends along the axial direction between the outer layer body and the inner layer body. an adhesive band provided to adhere the outer layer body and the inner layer body, the R-chamfered portion provided between the shoulder portion and the body portion being radially outward from the upper end portion of the body portion. A laminated releasable container made of synthetic resin and having a shape that overhangs, wherein the R chamfer includes enlarged R portions having a larger radius than other portions at portions corresponding to edge portions on both sides of the adhesive band. It is characterized by

In the laminated peelable container of the present invention, in the above configuration, it is preferable that the circumferential width of the enlarged R portion is 5 to 10 mm.

In the laminated peelable container of the present invention, in the above configuration, it is preferable that a shrink label is attached to cover at least the R chamfered portion.

In the laminated peelable container of the present invention, in the above structure, the diameter of the body gradually decreases downward from the upper end continuous to the R-chamfered part, and the lower end continues from the smallest diameter part to the bottom part. It is preferable to have a constricted shape in which the diameter gradually increases toward .

In the laminated peelable container of the present invention, in the above structure, a tangent to the shoulder at a boundary between the shoulder and the R chamfer, and a tangent to the body at a boundary between the body and the R chamfer. It is preferable that the angle α between the two is 100° or more and 150° or less.

According to the present invention, it is possible to provide an anchor shoulder-shaped laminated peelable container in which the inner layer can be smoothly peeled off from the outer layer at the edge portion of the adhesive band in the R-chamfered portion.

FIG. 1 is a partially cutaway front view of a laminated peelable container according to an embodiment of the present invention. FIG. 2 is a side view of the laminated container shown in FIG. 1; FIG. 2 is a plan view of the laminated container shown in FIG. 1. FIG. 4 is a cross-sectional view taken along line AA in FIG. 3. FIG. 4 is a sectional view taken along line BB in FIG. 3. FIG. FIG. 2 is a front view of a modification of the laminated peelable container shown in FIG. 1;

EMBODIMENT OF THE INVENTION Hereinafter, a laminated peelable container 1 according to an embodiment of the present invention will be illustrated in detail with reference to the drawings.

In this specification and claims, "upper" means the upper side when the laminated releasable container 1 is placed in the upright position shown in FIG. 1, and "lower" means the opposite side. The radial direction means a direction perpendicular to the axis O of the laminated container 1, and the circumferential direction means a circumferential direction around the axis O.

The laminated peelable container 1 shown in FIGS. 1, 2, and 3 is used for storing liquids such as cosmetics as contents, and includes an outer layer body 10 constituting an outer shell; It is provided with an inner layer body 20 which is laminated inside and is deformable to reduce its volume. A storage space S for contents is provided inside the inner layer body 20.

The contents of the laminated container 1 are preferably cosmetics, but may be other contents. Further, it is preferable that the laminated peelable container 1 has a full filling capacity of 50 to 300 ml. In this embodiment, the laminated container 1 has a full filling capacity of 130 ml and a content capacity of 100 ml. Note that the full filling capacity of the laminated peelable container 1 is not limited to 50 to 300 ml.

The lamination peeling container 1 is made of synthetic resin, and for example, a cylindrical laminated parison is formed by co-extruding the synthetic resin forming the outer layer body 10 and the synthetic resin forming the inner layer body 20 in a molten state. It can be formed by sandwiching the laminated parison between molds and blow molding (extrusion blow molding).

In this embodiment, the outer layer 10 is made of polyethylene (PE), polypropylene (PP), or the like. The inner layer body 20 can have a laminated structure consisting of ethylene vinyl alcohol copolymer resin (EVOH) constituting the outer layer, modified polyolefin resin constituting the adhesive layer, and polyethylene constituting the inner layer from the outside. The material can be selected as appropriate. Further, the outer layer body 10 and the inner layer body 20 may each have a single layer or a laminated structure.

As shown in FIG. 2, the laminated container 1 extends vertically along the axis O between the outer layer body 10 and the inner layer body 20, so that the inner layer body 20 is partially attached to the outer layer body 10. It is provided with an adhesive band (adhesive layer) 2 for adhesion. In the present embodiment, a parting line PL formed during blow molding is provided on the surface of the outer layer body 10, extending along the axis O from the mouth portion 11 to the bottom portion 14. Two adhesive bands 2 are provided side by side on both sides of the parting line PL so as to be symmetrical about the center.

By providing the adhesive band 2 having the above structure between the outer layer body 10 and the inner layer body 20, it is possible to control the peeling of the inner layer body 20 from the outer layer body 10 as the contents are poured out, and the inner layer body 20 remains in the storage space S. The remaining amount of contents can be reduced.

Note that the number of adhesive strips 2 can be changed in various ways.

The laminated container 1 can also have a structure in which barrier layers having barrier properties against oxygen and water vapor are laminated, for example, or a structure in which the barrier properties are enhanced by various coatings.

The outer layer body 10 includes a cylindrical mouth 11, a shoulder 12 extending below the mouth 11, a body 13 extending below the shoulder 12, and a bottom 14 closing the lower end of the body 13. We are prepared.

The mouth portion 11 has a cylindrical shape centered on the axis O, and includes an annular step portion 11a continuous to the upper end of the shoulder portion 12, a cylindrical portion 11b having a smaller diameter than the annular step portion 11a, and a diameter further than the cylindrical portion 11b. It has a small diameter mouth portion 11c.

A male threaded portion 11d for attaching a cap or the like to the laminated container 1 is integrally formed on the outer peripheral surface of the cylindrical portion 11b. In addition, a convex or concave engaged part is provided in place of the male threaded part 11d, and the concave or convex engaging part provided on the cap engages with the engaged part, so that the cap may be held in the mouth portion 11.

The cylindrical portion 11b is provided with outside air introduction holes 15 at two locations facing each other with the axis O interposed therebetween. The outside air introduction hole 15 is configured as a through hole having a circular cross section and passing through the outer layer body 10 in the radial direction. The outside air introduction hole 15 does not penetrate the inner layer body 20, and outside air can be introduced between the outer layer body 10 and the inner layer body 20 through the outside air introduction hole 15. Note that the outside air introduction holes 15 only need to be provided in the mouth portion 11, and their number and position are not limited to the illustrated example.

The shoulder portion 12 is integrally connected to the lower end portion of the mouth portion 11, that is, in this embodiment, the lower end portion of the annular step portion 11a, and gradually increases in diameter downward. In the present embodiment, the shoulder portion 12 has a truncated cone shape, which is inclined as a whole at a substantially constant angle with respect to the axis O, and whose outline is a straight line, but the present invention is not limited to this. It may have a dome shape that bulges out toward the container, or it may have an inverted dome shape that concave toward the inside of the container. Note that in this embodiment, the shoulder portion 12 has a shape in which the cross section (cross section) perpendicular to the axis O is circular; however, the shape is not limited to this, and the shape in which the cross section is elliptical or polygonal is also possible. But that's fine.

An R-chamfered portion 30 is provided between the shoulder portion 12 and the body portion 13, and the upper end portion of the body portion 13 is integrally connected to the lower end portion (outer peripheral edge portion) of the shoulder portion 12 via the R-chamfered portion 30. They are connected. When viewed from the front, the R-chamfered portion 30 is curved to form an R-chamfered shape between the shoulder portion 12 and the body portion 13, and extends annularly between the shoulder portion 12 and the body portion 13 around the axis O. It is a curved surface.

The lower end portion of the body portion 13 is integrally connected to the outer peripheral edge portion of the bottom portion 14 . The body 13 is flexible enough to be squeezed, and the laminated peelable container 1 is configured such that the content can be poured out by squeezing the body 13.

In this embodiment, the entire body portion 13 is curved so that the intermediate portion in the height direction (axial direction) is concave toward the axis O side. That is, the body portion 13 has a constricted shape in which the diameter gradually decreases downward from the upper end connected to the R-chamfered portion 30 and gradually increases in diameter from the minimum diameter portion where it is the smallest to the lower end connected to the bottom portion 14. It becomes.

In the present embodiment, the body portion 13 has a substantially cylindrical shape in which the cross section (cross section) perpendicular to the axis O is circular; however, the shape is not limited to this, and the body portion 13 may have an elliptical or polygonal cross section. But that's fine.

The bottom part 14 is in the shape of a disc with the central part curved toward the inside of the container, and by grounding the bottom surface of the bottom part 14, the laminated container 1 can stand on its own. A pinch-off portion 14a is formed in the bottom portion 14 by cutting off using a split mold for blow molding.

When viewed from the front, the laminated container 1 has a shape in which the R-chamfered portion 30 protrudes radially outward from the upper end portion of the body portion 13, that is, a so-called anchored shoulder shape. The delaminated container 1 has an anchored shoulder shape, giving it a sleek and aesthetically pleasing appearance.

As shown in FIG. 4, the radius R ₁ of the R-chamfered portion 30 is preferably less than 5 mm, for example. In this embodiment, the radius R ₁ of the R chamfered portion 30 is 2 mm. In this way, by setting the radius R ₁ of the R-chamfered portion 30 to less than 5 mm, the laminated peelable container 1 having the shape of an anchor shoulder can be made to have a smarter appearance and a higher aesthetic appearance.

Note that the radius R ₁ of the R-chamfered portion 30 is the radius on the outer surface of the R-chamfered portion 30 .

As shown in FIGS. 2 and 3, the R chamfered portion 30 includes enlarged R portions 31 at portions corresponding to the edge portions on both sides of the adhesive band 2 in the circumferential direction. In this embodiment, a pair of adhesive strips 2 are provided on the laminated peelable container 1 with a parting line PL in between, and one enlarged R portion 31 is different from the parting line PL of one adhesive strip 2. The other enlarged R portion 31 is provided so as to include the edge portion on the opposite side to the parting line PL of the other adhesive band 2. In addition, since the laminated peelable container 1 is provided with parting lines PL on both sides of the axis O, enlarged R A section 31 is provided. The enlarged R portion 31 is provided only in a predetermined range including the edge portions on both sides of the adhesive band 2 in the circumferential direction of the R chamfered portion 30, and is not provided in other portions 32 of the R chamfered portion 30.

As shown in FIG. 5, the radius R ₂ of each enlarged R portion 31 is the radius R 1 of the R chamfer 30, that is, the radius R ₁ of the other portion 32 of the R chamfer 30 where the enlarged R portion ₃₁ is not provided. It is larger than. In this embodiment, the radius R ₂ of each enlarged R portion 31 is 10 mm.

Note that the radius R ₂ of the enlarged R section 31 is the radius on the outer surface of the enlarged R section 31. Further, the other portion 32 of the R chamfered portion 30 is a portion excluding the connecting portion 33 where the radius between the enlarged R portion 31 and the other portion 32 changes.

When the laminated peelable container 1 has an anchored shoulder shape in which the R-chamfered portion 30 protrudes radially outward from the upper end portion of the body portion 13, the radius R ₁ of the R-chamfered portion 30 is defined as If the range is, for example, less than 5 mm, the inner layer body 20 will be difficult to peel off from the outer layer body 10, especially at the edge portion of the adhesive band 2 at the R chamfered portion 30, and the inner layer body 20 will be difficult to peel off during initial peeling treatment (preliminary peeling treatment) or the like. When the inner layer body 20 is peeled off from the outer layer body 10, there is a possibility that damage such as pinholes may occur in the inner layer body 20.

In contrast, in the laminated and peelable container 1 of the present embodiment, the R chamfered portion 30 is provided with an enlarged radius having a larger radius than the other portions of the R chamfered portion 30 at the portions corresponding to the edge portions on both sides of the adhesive band 2. Since the radius R 1 of the other portion 32 of the R-chamfered portion 30 is less than 5 mm, the appearance of the laminated removable container ₁ is made smart and aesthetically pleasing, and the edge portion of the adhesive band 2 is By making the radius R ₂ of the enlarged R portion 31 larger than the radius R ₁ of the other portion 32, it is possible to improve the releasability of the inner layer 20 from the outer layer 10 in this portion.

In this way, in the laminated and peelable container 1 of the present embodiment, the R chamfer 30 has enlarged R chamfers 30 having a larger radius than other parts of the R chamfer 30 in the portions corresponding to the edge portions on both sides of the adhesive band 2. Since the structure includes the section 31, the appearance of the laminated releasable container 1 is made to have a smart and aesthetically appealing anchored shoulder shape, while the inner layer body 20 is attached to the outer layer at the edge portion of the adhesive band 2 at the R-chamfered section 30. By allowing the inner layer body 20 to be peeled off smoothly from the body 10, it is possible to prevent damage such as pinholes from occurring in the inner layer body 20.

In addition, in the laminated peelable container 1 of the present embodiment, the diameter of the body portion 13 is gradually reduced downward from the upper end portion continuous to the R-chamfered portion 30, and the lower end continuous from the smallest diameter portion to the bottom portion 14. Since the container has a constricted shape that gradually expands in diameter toward the end, the container 1 can be made to have a smarter anchor shoulder shape and have a higher aesthetic appearance, while also preventing damage such as pinholes from occurring in the inner layer 20. It is possible to do so.

As shown in FIG. 3, the circumferential width W of the enlarged R portion 31 is preferably 5 to 10 mm (5.00 to 10.00 mm). In this embodiment, the circumferential width W of the enlarged R portion 31 is 6.37 mm, which corresponds to a range of 7 to 25 degrees in the circumferential direction starting from the parting line PL. Although only the circumferential width W of one enlarged R section 31 is shown in FIG. 3, the circumferential widths W of the four enlarged R sections 31 are all the same.

When the circumferential width W of the enlarged R portion 31 is less than 5 mm, it is possible to position the edge portion of the adhesive band 2 formed by the flow of adhesive resin when blow molding the laminated peelable container 1 to the enlarged R portion 31. This becomes difficult, and there is a risk that the shapeability of the enlarged R portion 31, which is a concave portion recessed inward in the radial direction, may deteriorate. On the other hand, if the circumferential width W of the enlarged R section 31 is made larger than 10 mm, the influence of the enlarged R section 31 on the appearance of the container will increase, and there is a possibility that the smart impression will fade and the aesthetic appearance of the laminated container 1 will deteriorate.

On the other hand, in the laminated removable container 1 of the present embodiment, the circumferential width W of the enlarged R portion 31 is in the range of 5 to 10 mm, so that when blow molding the laminated removable container 1, adhesive The edge of the adhesive band 2 at the R-chamfered part 30 can be reliably positioned at the enlarged R part 31, and the outer appearance of the laminated peelable container 1 can be maintained in the shape of a smart and aesthetic anchor shoulder. The structure can be such that the inner layer body 20 is peeled off from the outer layer body 10 more smoothly in some parts.

Note that the circumferential width W of the enlarged R portion 31 is not limited to a width in the range of 5 to 10 mm.

As shown in FIG. 4, the laminated container 1 has a tangent to the shoulder 12 at the boundary between the shoulder 12 and the R-chamfered portion 30, and a tangent to the body 13 at the boundary between the body 13 and the R-chamfered portion 30. It is preferable that the angle α formed by the tangent line is 100° or more and 150° or less. In this embodiment, the angle α is 117.225°. As a result, the container 1 that can be peeled off from the laminate can be made more aesthetically pleasing with a smarter anchor shoulder shape, while also being able to prevent damage such as pinholes from occurring in the inner layer 20.

FIG. 6 is a front view of a modification of the laminated peelable container shown in FIG. 1. In addition, in FIG. 6, the same reference numerals are given to the members or parts corresponding to the above-mentioned members or parts.

As shown in FIG. 6, the laminated peelable container 1 is preferably configured to have a shrink label 40 attached thereto, which covers at least the R chamfered portion 30 (that is, the enlarged R portion 31, the other portion 32, and the connecting portion 33). . In this embodiment, the shrink label 40 is configured to cover the upper end portion of the shoulder portion 12 to the bottom portion 14 of the laminated peelable container 1 . By providing the enlarged R section 31, the R chamfered section 30 has a shape with a concave portion recessed inward of the container at the portion where the enlarged R section 31 is provided, but the R chamfered section 30 is covered by the shrink label 40. By doing so, the concave portion can be made invisible from the outside, and the appearance of the laminated releasable container 1 can be made more aesthetically pleasing.

In particular, when the circumferential width W of the enlarged R section 31 is set to 10 mm or less, the shrink label 40 is made difficult to enter into the enlarged R section 31 that is recessed inward of the container. By suppressing this, the appearance of the laminated releasable container 1 can be made to have a smarter impression and high aesthetic appearance.

If the shrink label 40 can cover at least the R chamfered part 30 (that is, the enlarged R part 31, the other part 32, and the connecting part 33), for example, when the cap is attached to the mouth part 11, Its size and shape can be changed in various ways, such as configuring it as a full shrink covering from the top end surface to the bottom part 14. Moreover, various types of shrink labels can be used as the shrink label 40, such as transparent ones, colored ones, and ones with designs printed on them.

It goes without saying that the present invention is not limited to the embodiments described above, and can be modified in various ways without departing from the spirit thereof.

For example, in the laminated peelable container 1 shown in FIG. 1, the radius _R1 of the R chamfered portion 30 is 2 mm, but the radius is not limited to this.

Further, the laminated and peelable container 1 is not limited to one formed by extrusion blow molding, but may be formed by biaxial stretch blow molding using a preform.

Further, the shapes of the mouth portion 11, shoulder portion 12, body portion 13, and bottom portion 14 can be changed as appropriate. For example, the surfaces of the shoulder portion 12 and the body portion 13 may be provided with a recessed portion or a convex portion.

1 Laminated peelable container 2 Adhesive band 10 Outer layer body 11 Mouth portion 11a Annular step portion 11b Cylindrical portion 11c Mouth portion 11d Male thread portion 12 Shoulder portion 13 Body portion 14 Bottom portion 14a Pinch-off portion 15 Outside air introduction hole 20 Inner layer body 30 R chamfered portion 31 Enlargement R part 32 Other parts 33 Connecting part O Axis S Storage space PL Parting line R ₁ Radius of R chamfer R ₂ Radius of enlarged R part W Circumferential width Ra of enlarged R part Range α Angle

Claims (5)

A cylindrical mouth portion having an outside air introduction hole, a shoulder portion that is connected to the mouth portion and whose diameter gradually increases downward, a body portion that is connected to the shoulder portion, and a bottom portion that closes a lower end portion of the body portion. an outer layer body having;
an inner layer body that is laminated inside the outer layer body and is deformable to reduce volume;
an adhesive band provided extending along the axial direction between the outer layer body and the inner layer body and bonding the outer layer body and the inner layer body;
A laminated peelable container made of synthetic resin, wherein an R-chamfered portion provided between the shoulder portion and the body portion has a shape that projects outward in the radial direction from an upper end portion of the body portion,
The laminated and peelable container is characterized in that the R chamfered portion includes enlarged R portions having a larger radius than other portions at portions corresponding to edge portions on both sides of the adhesive band. The laminated peelable container according to claim 1, wherein the circumferential width of the enlarged R portion is 5 to 10 mm. The laminated peelable container according to claim 1 or 2, further comprising a shrink label that covers at least the R-chamfered portion. The body portion has a constricted shape in which the diameter gradually decreases downward from the upper end connected to the R chamfered portion, and gradually increases in diameter from the smallest diameter portion where the diameter is the smallest toward the lower end connected to the bottom portion. , the laminated peelable container according to any one of claims 1 to 3. An angle α formed by a tangent to the shoulder at the boundary between the shoulder and the R-chamfered portion and a tangent to the trunk at the boundary between the body and the R-chamfer is 100° or more, and 150° or more. The laminated releasable container according to any one of claims 1 to 4, which has a temperature of at most 100 °C.

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