JP7246946B2 - delaminating container - Google Patents

Description

The present invention comprises an outer layer body having a mouth portion, a shoulder portion, a body portion, and a bottom portion, and an inner layer body detachably laminated inside the outer layer body, and a reinforcing rib is provided in the pinch-off portion of the bottom portion. and a delamination container.

A delamination container (delaminated container) having an outer layer body and an inner layer body is formed by, for example, co-extrusion of the synthetic resin forming the outer layer body and the synthetic resin forming the inner layer body in a molten state to form a cylindrical laminated parison. Then, the laminated parison is sandwiched between molds and blow-molded (extrusion blow-molded). A pinch-off portion is formed at the bottom of such a delaminating container by parting with a split mold for blow molding.

By the way, it is necessary to peel off the inner layer from the outer layer of the delaminated container, and since they are made of synthetic resin materials that are not compatible with each other, there is a risk that the inner layer will peel off from the outer layer at the pinch-off portion. There is Therefore, in order to suppress the bottom crack phenomenon, the pinch-off portion is provided with reinforcing ribs (bottom ribs) formed by sandwiching and flattening the outer layer body and the inner layer body with split dies. .

For example, Patent Literature 1 discloses a delamination container provided with reinforcing ribs linearly extending along the pinch-off portion of the bottom. Further, the container of Patent Document 1 is provided with a biting portion that bites from one side surface of the reinforcing rib toward the other side surface in order to enhance the effect of suppressing the bottom crack phenomenon in the pinch-off portion.

Japanese Patent Application Laid-Open No. 2003-341639

However, when the container is dropped with liquid inside and the reinforcing rib receives a strong impact, there is still a possibility that the bottom crack phenomenon will occur. Specifically, for example, the central area of the bottom is deformed to protrude below the ground surface due to the water hammer phenomenon due to the drop impact, and the impact at the time of drop is applied directly to the reinforcing ribs on the protruding bottom surface. As a result, there is a risk that a bottom crack phenomenon will occur in which the inner layer body separates from the outer layer body.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a delaminating container that can further suppress the bottom cracking phenomenon at the pinch-off portion caused by a drop impact or the like.

The present invention has been made to solve the above problems, and the delamination container of the present invention comprises a tubular opening, a tubular trunk located below the opening, and a An outer layer body having a bottom portion that closes a lower end portion, and a volume-reducing and deformable inner layer layer layered inside the outer layer body,
the bottom portion has reinforcing ribs extending along the pinch-off portion;
A concave portion is provided in the center portion of the reinforcing rib in the extending direction, and is concave from the lower edge portion of the reinforcing rib toward the upper direction in the axial direction,
The reinforcing rib has a plurality of biting portions that bite from one side surface of the reinforcing rib to the other side surface or from the other side surface toward the one side surface,
The plurality of biting portions are alternately arranged vertically along the extending direction of the reinforcing rib so that the biting portion positioned at the center in the extending direction of the reinforcing rib is positioned on the lower side. It is characterized by

In addition, in the delaminating container of the present invention, it is preferable that the directions of biting of the plurality of biting portions are alternately reversed.

Moreover, in the delaminating container of the present invention, it is preferable that the plurality of biting portions are arranged symmetrically with respect to the center in the extending direction of the reinforcing rib.

Moreover, in the delaminating container of the present invention, it is preferable that the concave portion is formed in an arc shape when viewed from a direction perpendicular to the side surface of the reinforcing rib.

Further, in the delamination container of the present invention, some of the plurality of biting portions are arranged to extend from the concave portion of the reinforcing rib to a horizontal portion outside the concave portion, and It is preferable to have a bent portion.

ADVANTAGE OF THE INVENTION According to this invention, the lamination peeling container which can further suppress the bottom crack phenomenon in the pinch-off part resulting from a drop impact etc. can be provided.

1 is a front view showing a delamination container according to one embodiment of the present invention; FIG. FIG. 2 is a partially enlarged view of the delamination container of FIG. 1; 2 is a side view of the delaminating container of FIG. 1; FIG. 2 is a bottom view of the delaminating container of FIG. 1; FIG.

Hereinafter, a delamination container 1 according to an embodiment of the present invention will be described in detail with reference to the drawings. In this specification, the scope of claims, and the abstract, "upper" means the side where the mouth portion 11 is located with respect to the bottom portion 14 of the outer layer body 10, and "lower" means the opposite side ( the side where the bottom portion 14 is located with respect to the mouth portion 11).

As shown in FIG. 1 , a delamination container 1 (hereinafter also simply referred to as “container”) according to the present embodiment includes a tubular mouth portion 11, a tubular body portion 13 positioned below the mouth portion 11, and an outer layer body 10 that has a bottom portion 14 that closes the lower end portion of the body portion 13 and constitutes the outer shell of the container 1; . The inner layer body 20 is configured to be peelable from the outer layer body 10 .

The inside of the inner layer body 20 serves as an accommodation space S for contents. The container 1 is made of synthetic resin. For example, the synthetic resin forming the outer layer 10 and the synthetic resin forming the inner layer 20 are co-extruded in a molten state to form a cylindrical laminated parison. can be formed by sandwiching between molds and blow-molding (extrusion blow-molding).

In this embodiment, the outer layer body 10 is made of polyethylene (PE), polypropylene (PP), or the like, and the inner layer body 20 is made of ethylene-vinyl alcohol copolymer resin (EVOH) constituting the outer layer from the outside, adhesive Modified polyolefin resin (“ADMER” (registered trademark) manufactured by Mitsui Chemicals, Inc., “Modic” (registered trademark) manufactured by Mitsubishi Chemical Corporation, etc.) constituting the layer, and polyethylene constituting the inner layer can be a laminated structure. However, the material used for each layer can be appropriately selected. Further, the outer layer body 10 and the inner layer body 20 may each have a single layer structure or a laminated structure.

In the container 1, between the outer layer body 10 and the inner layer body 20, there is one or a plurality of adhesive layers (adhesion bands) extending vertically to partially bond the inner layer body 20 to the outer layer body 10. can also be configured with The container 1 may not have the adhesive layer. Further, the container 1 may have a structure in which barrier layers having barrier properties against oxygen and water vapor are laminated, or a structure in which the barrier properties are enhanced by various coatings.

The outer layer body 10 includes a cylindrical mouth portion 11 having an opening 11b at an upper end portion 11a, a shoulder portion 12 connected to a lower end portion 11c (the other end portion) of the mouth portion 11 and extending radially outward, and a shoulder portion 12 below the shoulder portion 12. and a bottom portion 14 connected to the lower end of the body portion 13 .

The mouth portion 11 has a stepped annular step portion 11 d provided near the lower end portion 11 c (the other end portion) of the mouth portion 11 and continuing to the upper end of the shoulder portion 12 . In addition, the mouth portion 11 has a cylindrical portion 11e that continues above the annular stepped portion 11d and has a diameter smaller than that of the annular stepped portion 11d. It has become.

A male threaded portion 11f for attaching a cap or the like to the container 1 is formed on the outer peripheral surface of the cylindrical portion 11e. A convex or concave engaged portion is provided instead of the male thread portion 11f, and the concave or convex engaging portion provided on the cap is engaged with the engaged portion, thereby opening the cap. You may make it hold|maintained at the part 11. FIG.

11 g of outside air introduction holes are formed in two locations facing each other with the axis O interposed therebetween in the cylindrical portion 11 e. The outside air introduction hole 11g penetrates the outer layer body 10 horizontally toward the axis O and has a circular shape. The outside air introduction hole 11g does not penetrate the inner layer body 20, and air can flow between the outer layer body 10 and the inner layer body 20 through the outside air introduction hole 11g. In this example, the outside air introduction holes 11g are provided in the mouth portion 11, but the number, shape, and position thereof are limited as long as they can introduce air between the outer layer body 10 and the inner layer body 20. not.

The shoulder portion 12 continues to the lower end portion 11c (annular stepped portion 11d) of the mouth portion 11 and extends downward (diameter expands) outward in the radial direction. As shown in FIGS. 1 and 3, the shoulder portion 12 of this example is inclined at a substantially constant angle with respect to the axis O, and has a flat shape with a straight outline. Instead, it may have a dome shape that protrudes toward the outside of the container, or it may have an inverted dome shape that becomes concave toward the inside of the container.

The body portion 13 has an upper end portion 13 b connected to the lower end portion (peripheral edge portion) of the shoulder portion 12 , and a lower end portion 13 c of the body portion 13 connected to the outer peripheral edge portion of the bottom portion 14 . The trunk portion 13 has a squeezable flexibility, and the content can be poured out by squeezing the trunk portion 13 . The method of pouring out the contents is not particularly limited. For example, the container 11 may be placed in an inverted position so that the contents are poured out by its own weight. may be installed. Further, the trunk portion 13 is curved and constricted as a whole so that an intermediate portion in the height direction (axial direction) is concave toward the axis O side. That is, the body portion 13 gradually decreases in diameter downward from an upper end portion 13b connected to the shoulder portion 12, and gradually expands in diameter from a minimum diameter portion 13a, which is the smallest diameter, toward a lower end portion 13c connected to the bottom portion 14. ing. In this example, the minimum diameter portion 13 a is located above the height center of the body portion 13 . Further, in the trunk portion 13 of this example, the diameter of the lower end portion 13c connected to the bottom portion 14 is slightly larger than that of the upper end portion 13b connected to the shoulder portion 12 . That is, the maximum diameter position of the container 1 is provided at the lower end portion 13 c of the body portion 13 .

The bottom portion 14 has a disc shape with the center portion directed toward the inside of the container and curved in a concave shape, and the container 1 can stand on its own by grounding an arc-shaped ground surface 14a provided near the outer peripheral edge of the bottom portion 14 to the ground. It is possible. A pinch-off portion 14b is formed in the bottom portion 14 of this example by parting with a split mold for blow molding.

As shown in the bottom view of FIG. 4 , the pinch-off portion 14 b extends linearly along the parting line from the bottom portion 14 to the lower portion of the trunk portion 13 . It extends radially through the center. As shown in FIG. 2, the ends 14d on both sides of the pinch-off portion 14b are arranged at positions facing each other with the axis O of the body portion 13 interposed therebetween. The pinch-off portion 14 b may have only one end on the trunk portion 13 and the other end on the bottom portion 14 , or both ends on the bottom portion 14 . Also, the shape of the pinch-off portion 14b can be changed as appropriate, and may have, for example, a curved portion or a bent portion.

The pinch-off portion 14b is provided with reinforcing ribs 14c formed by pinching and flattening the outer layer body 10 and the inner layer body 20 with a split mold. 20 is configured so as not to peel off. The reinforcing rib 14c extends linearly along the pinch-off portion 14b of the bottom portion 14. As shown in FIG.

Here, as shown in FIG. 2, the contour line of the upper edge 14e of the reinforcing rib 14c at the central portion in the extending direction of the reinforcing rib 14c when viewed from the direction perpendicular to the side surface of the reinforcing rib 14c It is curved in an arc shape along the curved shape of the central region. That is, the contour line of the upper edge portion 14e of the reinforcing rib 14c at the central portion in the extending direction of the reinforcing rib 14c is concave upward in the axial direction. The axial direction is the direction along the central axis O of the container 1, which is the vertical direction in FIGS.

A recessed portion 14g is provided in the center portion of the reinforcing rib 14c in the extending direction, the recessed portion 14g being recessed upward in the axial direction from the lower edge portion 14f of the reinforcing rib 14c. Further, the outline of the recess 14g is formed in a concentric arc shape so as to have a constant interval from the outline of the upper edge 14e of the reinforcing rib 14c. That is, the height of the reinforcing rib 14c in the vertical direction (axial direction) is substantially constant at the central portion in the extending direction of the reinforcing rib 14c where the concave portion 14g is provided. A horizontal portion 14h having a linear outline is provided outside the concave portion 14g provided in the lower edge portion 14f of the reinforcing rib 14c. The horizontal portion 14h may extend generally in a direction perpendicular to the axis O as a whole. It includes a shape that is slightly inclined with respect to a plane perpendicular to the axial direction, a curved shape, and the like.

A plurality of biting portions 15a to 15g are provided on the reinforcing rib 14c. In this example, the biting portion 15a (formed so as to enter the reinforcing rib 14c from the front side to the back side of the paper surface in FIG. 1) that bites from one side surface of the reinforcing rib 14c toward the other side surface, 15c, 15e, 15g, and biting portions 15b, 15d (formed so as to enter into reinforcing rib 14c from the back side to the front side of the paper surface in FIG. 1) biting from the other side toward one side. , 15f are formed. In this example, the biting directions of the biting portions 15a to 15g are alternately reversed along the extending direction of the reinforcing rib 14c, thereby increasing the crimping strength of the reinforcing rib 14c. The biting direction of each of the plurality of biting portions 15a to 15g is not particularly limited.

The biting portions 15a to 15g are alternately arranged vertically along the extending direction of the reinforcing rib 14c. In this example, four biting portions 15a, 15c, 15e, and 15g are positioned above the reinforcing rib 14c, and three biting portions 15b, 15d, and 15f are positioned below the reinforcing rib 14c. The biting portion 15d located at the central portion in the extending direction of the reinforcing rib 14c is located on the lower side.

Further, in this example, the plurality of biting portions 15a to 15g are arranged symmetrically with respect to the center (located on the axis O) in the extending direction of the reinforcing rib 14c. Also, the three biting portions 15c, 15d, and 15e located on the central side in the extending direction of the reinforcing rib 14c extend in an arc shape. The biting portions 15c and 15e extend along the upper edge portion 14e of the reinforcing rib 14c, and the biting portion 15d extends along the lower edge portion 14f.

Further, four biting portions 15a, 15b, 15f, and 15g located on both sides (outside) of the three biting portions 15c, 15d, and 15e are shaped to have bent portions. The biting portions 15a, 15g extend along the upper edge 14e of the reinforcing rib 14c, and the biting portions 15b, 15f extend along the lower edge 14f.

As described above, in the container 1 of the present embodiment, the concave portion 14g is provided at the center portion of the reinforcing rib 14c in the extending direction and is concave from the lower edge portion 14f of the reinforcing rib 14c toward the axial direction upward. ing. As a result, even if the central region of the bottom portion 14 is deformed downward due to a drop impact or the like, the reinforcing rib 14c is less likely to be deformed to protrude downward from the ground contact surface 14a. Furthermore, in the container 1 of this embodiment, the plurality of biting portions 15a to 15g are alternately arranged vertically along the extending direction of the reinforcing ribs 14c. As a result, the compression strength between the outer layer body 10 and the inner layer body 20 at the reinforcing ribs 14c can be increased compared to the case where a plurality of biting portions are arranged in a straight line. Due to these actions, according to the container 1 of the present embodiment, even if a water hammer phenomenon or the like occurs due to a drop impact, the bottom crack phenomenon at the pinch-off portion 14b can be suppressed.

Here, in addition to the water hammer phenomenon described above, for example, due to an increase in the internal pressure of the container 1 or the like, it is conceivable that the central region of the bottom portion 14 deforms downward, causing a “bottom drop phenomenon”. The increase in the internal pressure of the container 1 may be caused, for example, by changes in the contents or the air existing in the headspace. Although it can be set as an increase, etc., it is not limited to these. At this time, if the reinforcing rib 14c is not provided with the concave portion 14g, the lower edge portion 14f of the reinforcing rib 14c protrudes below the ground contact surface 14a, and when the container 1 is placed on the ground in an upright position, the container 1 is shaken. There is a risk that it will occur. On the other hand, in the container 1 of the present embodiment, since the recess 14g is provided in the lower edge 14f of the reinforcing rib 14c, the reinforcing rib 14c even if the bottom drop phenomenon occurs as described above. is less likely to protrude downward from the ground surface 14a, and the occurrence of rattling when the container 1 is grounded can be suppressed.

Here, for example, when a concave portion 14g is provided in the central portion of the reinforcing rib 14c and the biting portion located in the central portion is positioned above the reinforcing rib 14c, the container is extracted from the mold after blow molding. In some cases, the surface of the container may be scratched (flawed scratch). This is because the pin-shaped portion of the mold for forming the biting portion that forces the container out of the mold is arranged at the position closest to the bottom surface, and the tip of the pin-shaped portion is located at the bottom of the mold. It comes into contact with the surface of the container and easily causes scratches. On the other hand, in the case of the container 1 of the present embodiment, since the biting portion 15d located at the center in the extending direction of the reinforcing rib 14c is located below the reinforcing rib 14c, the pin-shaped portion of the mold is removed. is arranged at a position far from the bottom surface. As a result, when the container 1 is removed from the mold after the container 1 has been blow-molded in the mold, the tip of the pin-shaped portion of the mold for forming the biting portion 15d is less likely to come into contact with the surface of the container 1. As a result, it is possible to prevent the surface of the container 1 from being scratched (missing scratch).

Further, in the container 1 of this embodiment, since the biting directions of the biting portions 15a to 15g are alternately reversed along the extending direction of the reinforcing ribs 14c, the outer layer body 10 at the reinforcing ribs 14c and the compression strength of the inner layer body 20 can be further increased. As a result, the bottom crack phenomenon at the pinch-off portion 14b can be suppressed more reliably.

Further, in the container 1 of the present embodiment, the plurality of biting portions 15a to 15g are arranged symmetrically with respect to the center (positioned on the axis O) in the extending direction of the reinforcing rib 14c. , the crimping strength of the reinforcing rib 14c can be evenly increased on the left and right sides. As a result, when the reinforcing rib 14c receives a strong impact, it is possible to suppress the stress from being partially concentrated, thereby more effectively suppressing the bottom crack phenomenon.

Further, in the container 1 of the present embodiment, part of the biting portions 15b and 15f out of the plurality of biting portions 15a to 15g extend from the concave portion 14g of the reinforcing rib 14c to the horizontal portion 14h outside the concave portion 14g. and has a bent portion. By arranging the biting portions 15b and 15f across the recess 14g and the horizontal portion 14h in this way, the compression strength of the reinforcing rib 14c in the vicinity of the boundary portion between the recess 14g and the horizontal portion 14h can be effectively increased. can be done. Furthermore, since the biting portions 15b and 15f have bent portions, the shapes of the biting portions 15b and 15f become more complicated than when the biting portions 15b and 15f are straight, and the reinforcing rib 14c extending from the concave portion 14g to the horizontal portion 14h is crimped more effectively. Strength can be increased. As a result, even if a drop impact or the like occurs, the area extending from the concave portion 14g to the horizontal portion 14h of the bottom portion 14 is less likely to deform downward.

Note that the container 1 of this example can have a structure in which contents such as liquid can be poured out by, for example, attaching a pouring cap (not shown) to the mouth portion 11 and squeezing the body portion 13 . In this case, as the contents are poured out, air is introduced between the outer layer body 10 and the inner layer body 20 through the outside air introduction holes 11g, and the inner layer body 20 containing the contents is reduced in volume and deformed. Become.

What has been described above merely shows an example of the present invention, and various modifications can be made within the scope of the claims. For example, the concave portion 14g in the reinforcing rib 14c is not limited to an arcuate shape when viewed from the direction perpendicular to the side surface of the reinforcing rib 14c, and may be changed as appropriate. For example, it may be triangular or quadrangular. Also, the number, position, direction of biting, etc. of the biting portions 15a to 15g can be changed as appropriate. Further, the shape of the mouth portion 11, the shoulder portion 12, the body portion 13, and the bottom portion 14 of the container 1 can be changed as appropriate. good too. In addition, the shoulder portion 12 and the body portion 13 of this example have a circular cross section (cross section) perpendicular to the axis O, but are not limited thereto, and may have an elliptical or polygonal cross section. It can be any shape.

1: Delamination container 10: Outer layer body 11: Mouth 11a: Upper end of mouth 11b: Opening 11c: Lower end of mouth 11d: Annular stepped portion 11e: Cylindrical portion 11f: Male screw portion 11g: Outside air introduction hole 12: Shoulder 13: Body 13a: Minimum diameter portion 13b: Upper end of body 13c: Lower end of body 14: Bottom 14a: Ground contact surface 14b: Pinch-off portion 14c: Reinforcing rib 14d: End of pinch-off portion 14e: Top Edge 14f: Lower edge 14g: Concave portion 14h: Horizontal portion 15a to 15g: Biting portion 20: Inner layer body O: Axis line S: Storage space

Claims (4)

An outer layer body having a cylindrical mouth portion, a cylindrical body portion positioned below the mouth portion, and a bottom portion closing a lower end portion of the body portion; a possible inner layer, and
the bottom portion has reinforcing ribs extending along the pinch-off portion;
The reinforcing rib is provided with a concave portion that is concave axially upward from a lower edge portion of the reinforcing rib at a central portion in the extending direction of the reinforcing rib,
The reinforcing rib has a plurality of biting portions that bite from one side surface of the reinforcing rib to the other side surface or from the other side surface toward the one side surface,
The plurality of biting portions are alternately arranged vertically along the extending direction of the reinforcing rib so that the biting portion positioned at the center in the extending direction of the reinforcing rib is positioned on the lower side. ,
A lamination characterized in that some of the plurality of biting portions are disposed across the concave portion of the reinforcing rib to a horizontal portion outside the concave portion and have a bent portion. exfoliation container. 2. The delaminating container according to claim 1, wherein the plurality of biting portions alternately reverse their biting directions. 3. The delaminating container according to claim 1, wherein the plurality of biting portions are arranged symmetrically with respect to the center in the extending direction of the reinforcing rib. The delamination container according to any one of claims 1 to 3, wherein the concave portion is formed in an arc shape when viewed from a direction perpendicular to the side surface of the reinforcing rib.

Images