JP2017197239A - Delamination container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a delamination container; which has enhanced peel resistance strength between a pair of rib pieces constituting a bottom seal part; and which can prevent a bottom crack due to expansion deformation of a bottom wall caused by an internal pressure rise during heating, and a large bending force; and which can secure a self-standing property of the container, as well as maintain an excellent usage condition stably.SOLUTION: A delamination container comprises: multiple lateral ribs 15, which are formed in a bottom wall 10, vertically connected to a pair of rib pieces 14 on both sides of a bottom seal part 13, and disposed alternately along the bottom seal part 13 extending in a longitudinal direction; and biting parts 16 which are disposed in a bottom seal part 13, and which have lateral hole shapes biting from one side to the other side of the pair of rib pieces 14 overlapped and press-attached. The lateral ribs 15 and the biting parts 16 are arranged facing each other across the bottom seal part 13.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a structure of a bottom seal portion of a blow-molded delamination container.

  Lamination which is a blow molded casing made of a synthetic resin, generally called a delamination bottle, which is constructed by laminating a flexible bag-like inner layer on an outer layer with a high self-shape-holding ability in a state where it can be easily peeled off. Peeling containers are known.

  This laminated peeling container is obtained by extruding an incompatible outer layer parison and an inner layer parison into a laminated parison and blow molding this laminated parison, but it is crushed at the pinch-off part of the blow mold and cut into pieces. Since the bottom seal portion basically has a laminated structure of an outer layer portion and an inner layer portion that are not compatible with each other, there has been a problem that a bottom crack is easily generated due to weak pressure bonding strength.

As a conventional technique for solving this problem, in Patent Document 1, a bottom seal portion that is flattened by a pinch-off portion of a blow mold and cut and cut is formed, and a pair of rib pieces are superposed and pressure bonded along a parting line. And a plurality of biting portions that bite from one of the pair of rib pieces to the other.
Further, in Patent Document 2, a central concave portion is formed in which a central portion of a bottom wall is recessed inwardly, and a bottom extending in a vertical rib shape along a parting line formed during molding is formed in the central concave portion. The seal portion (pinch-off portion) and a plurality of lateral ribs extending vertically from the bottom seal portion in both directions are alternately arranged.

JP-A-8-216238 JP 2013-209144 A

  However, in the prior art described in Patent Document 1, by providing a plurality of biting portions, the crimping area between the outer layer and the inner layer in the bottom seal portion is increased, and the crimping between the pair of rib pieces accordingly. However, if the depth dimension of the bite portion is excessively deepened, the bottom seal portion is partially thinned, and the bottom seal portion formed with a large number of such bite portions becomes its own machine. There is a risk that the mechanical strength is likely to decrease.

  Furthermore, in the prior art described in Patent Document 2, the plurality of lateral ribs arranged perpendicularly to the bottom seal portion prevents the bottom wall from bulging and deforming during heat filling and increases the internal pressure during heating. The bottom wall is prevented from bulging and is reinforced so that the crimped part between one rib piece and the other rib piece that constitutes the bottom seal part does not peel off. Is effective in the case of a blow container formed by a compatible multi-layer parison (integrated laminate) (in the case of Patent Document 2), but the outer layer and the outer layer. In the case of a delamination container formed by laminating an inner layer formed into a bag shape that is flexible and deformable with a synthetic resin material that is not compatible with the above, the delamination resistance between the pair of rib pieces obtained is not good. Easy enough.

  In particular, in the case where the liquid contents are poured out using the squeeze deformation of the container body, a large bending force acts on the bottom when the squeeze deformation of the body, so the bottom seal part (pinch-off part) In the technique described in Patent Document 2, it is not always possible to withstand the bending force acting from the body side. Since there is not, further reinforcement | strengthening of the peeling strength between a pair of rib piece in a bottom seal part is calculated | required strongly.

  Therefore, the technique disclosed in Patent Document 2 in which a plurality of lateral ribs are arranged perpendicularly to the bottom seal portion is employed in a delamination container formed with an incompatible outer layer and inner layer shown in Patent Document 1 above. In order to do so, there is a hindrance factor that the peel strength between the pair of rib pieces constituting the bottom seal portion becomes insufficient, and the idea that the bottom seal portion is arranged together with the biting portion and the lateral rib. Could not happen.

  Therefore, the present invention was devised to solve the above-described problems in the prior art, and enhances the peel resistance between a pair of rib pieces constituting the bottom seal portion, thereby expanding the bottom wall during heat filling. Prevents deformation from deformation, prevents bulging deformation of the bottom wall due to an increase in internal pressure during heating, and prevents cracking from the bottom seal due to a large bending force when falling, and ensures the container's independence and ensures good use. It is an object to create a delamination container that can be stably maintained.

Among the means for solving the above problems, the main means of the present invention is as follows.
A delamination that is formed by stacking an outer layer and an inner layer made of an inner bag that is incompatible with the outer layer, while being provided with an upright continuous cylinder at the upper end of a cylindrical body with the lower end closed at the bottom A container,
The bottom part is composed of a surrounding grounding part constituting the leg part of the container, a bottom wall surrounded by the grounding part and sinking into the container, and a pair of rib pieces vertically running through the bottom wall, which are superposed and pressure-bonded in a protruding shape. A vertical rib-shaped bottom seal portion,
On the bottom wall, a plurality of lateral ribs are formed on both sides of the bottom seal portion so as to be perpendicular to the pair of rib pieces and arranged alternately along the longitudinal direction in which the bottom seal portion extends,
The bottom seal portion is formed with a lateral hole-shaped biting portion that bites into the other from one of the pair of rib pieces subjected to superposition pressure bonding,
The lateral rib and the biting portion are arranged to face each other with the bottom seal portion interposed therebetween.

  In the main means of the present invention, a lateral rib is formed on one rib piece constituting the bottom seal portion, and a biting portion is formed on the other rib piece, and the horizontal rib and the biting portion are opposed to each other with the bottom seal portion interposed therebetween. By adopting the configuration in which the pair of rib pieces are disposed, the mechanical strength of the bottom seal portion can be prevented from being lowered even if the depth of the biting portion is increased.

    According to another means of the present invention, a means that the depth of the biting portion is formed to be deeper than the thickness of the bottom seal portion is added to the main means.

  In the above means, since the biting portion and the lateral rib are in a position facing each other, the depth of the biting portion can be increased.

  In another means of the present invention, a means that the transverse rib is formed in a trapezoidal cross section is added to any one of the above means.

  In the above means, the mechanical strength of the bottom seal portion can be reinforced by increasing the strength of the lateral ribs.

  In addition, another means of the present invention is obtained by adding a means that a bulging part is provided in the back part of the biting part to any of the above means.

  In the above means, an engagement portion that is curved in an undercut structure is formed on the overlapping surface of one rib and the other rib piece, whereby an improvement in peel strength between the pair of rib pieces can be achieved.

  Further, according to another means of the present invention, in any one of the above means, three lateral ribs are disposed on both sides of the bottom seal portion, and three biting portions are disposed on both sides of the bottom seal portion. It is the one that added the means.

  In the above means, the mechanical strength of the bottom seal portion and the peel strength between the pair of rib pieces can be further improved by providing the same number of biting portions as the plurality of lateral ribs.

  Further, according to another means of the present invention, in any one of the above means, two biting parts close to the container axis are arranged on the upper end side of the bottom seal part, and the remaining four biting parts are arranged on the lower end side of the bottom seal part. It is the one that added the means.

  With the above means, it is possible to achieve an improvement in the peel strength on the upper end side of the bottom seal portion on the side close to the container shaft, and an improvement in the peel strength on the lower end side of the bottom seal portion at a position away from the container shaft.

  According to another means of the present invention, in the above means, the two biting portions arranged on the upper end side are arranged on the first virtual circle, and the remaining four biting portions have a smaller radius of curvature than the first virtual circle. 2 is added to the means of being arranged on an imaginary circle.

  In the above means, the peel strength can be improved by the two biting portions arranged on the first virtual circle and the four biting portions arranged on the second virtual circle.

Since the present invention has the above-described configuration, the following effects can be obtained.
Even if the depth dimension of the biting portion that prevents separation between the pair of rib pieces is increased, the mechanical strength of the bottom seal portion can be prevented from being lowered due to the presence of the lateral rib. As a result, the peel strength is increased, and it is possible to strongly prevent bulging deformation of the bottom wall during heat filling, bulging deformation of the bottom wall due to an increase in internal pressure during heating, and bottom cracking due to a large bending force during dropping. .
Furthermore, since it becomes difficult to crack the bottom, the self-supporting property of the container is increased, and a good use state can be stably maintained.

It is a front view of the lamination peeling container which shows one Example of this invention. It is a side view of a lamination peeling container. It is a perspective view which shows the bottom part of a lamination peeling container. It is a top view which shows the bottom part of a lamination peeling container. It is an enlarged front view of the bottom seal part shown from the arrow V direction of FIG. It is a top view which expands and shows the bottom part of a lamination peeling container partially. It is an expanded sectional view in the VII-VII line of FIG.

Embodiments of the present invention will be described below with reference to the drawings.
1 is a front view of a delamination container showing one embodiment of the present invention, FIG. 2 is a side view of the delamination container, FIG. 3 is a perspective view showing the bottom of the delamination container, and FIG. 4 is a bottom view of the delamination container. FIG. 5 is an enlarged front view of the bottom seal portion shown from the direction of the arrow V in FIG. 4, FIG. 6 is an enlarged plan view showing the bottom portion of the delamination container, and FIG. 7 is a line VII-VII in FIG. It is an expanded sectional view.

  A container 1 shown in FIG. 1 to FIG. 7 is made of a synthetic resin material such as polyethylene or polypropylene, and has an outer layer 2 molded with a necessary self-shape retaining capability, and nylon, ethylene vinyl alcohol copolymer, A synthetic resin material, such as polyethylene terephthalate, that is incompatible with the outer layer 2 and laminated with an inner layer 3 that is molded into a bag shape and deforms with deformation as the contents decrease (see FIG. 2). On the other hand, it is a lamination peeling container in which the inner layer 3 was formed so that peeling was possible.

The container 1 is formed into a bottle shape by sandwiching one end of a cylindrical parison obtained by co-extrusion of an incompatible outer layer parison and an inner layer parison with a mold and performing extrusion blow molding (EBM) by blowing compressed air. Molded.
The body portion 4 of the container 1 has a cylindrical shape, and a mouth tube portion 5 in which a thread is engraved on the outer peripheral surface is provided upright at the upper end of the body portion 4. An intake hole 6 for introducing outside air between the outer layer 2 and the inner layer 3 is formed in the outer layer 2 part before and after the mouth tube part 5, and the lower end of the body part 4 has a circular bottom wall 10. It is closed at the bottom 7.
The inner layer 3 does not need to be a single layer, and may be a multilayer as long as the layer in contact with the outer layer 2 is composed of an incompatible layer. For example, the inner layer 3 may be a bag shape that can be flexed and deformed, such as nylon / polyethylene, ethylene vinyl alcohol copolymer / polyethylene, and the like.

  The bottom portion 7 is connected to a surrounding grounding portion 8 constituting a leg portion of the container 1, a bottom wall 10 that is surrounded by the grounding portion 8 and sinks into a dome shape, for example, and the bottom wall 10. In addition, it is configured to have a vertical rib-shaped bottom seal portion 13 that is positioned on the parting line PL and cuts the bottom wall 10 vertically.

  The grounding portion 8 has a structure in which a circular arc section is provided between the lower end of the substantially upright cylindrical body portion 4 and the lower end of the bottom wall 10 having a dome shape, and is arranged in an annular shape. A concave portion 9 is formed in the portion where is located.

  As shown in FIGS. 3 and 4, the bottom seal portion 13 cuts the center of the bottom wall 10, and both ends of the bottom seal portion 13 extend to a virtual boundary circle 11 located inside the grounding portion 8, and the parison is blown into the container 1. At the time of molding, a pair of rib pieces 14 obtained by crushing the parison flatly from left and right to form vertical ribs and then biting it out is formed into a ridge shape by polymerization pressure bonding as it is. On the lower end surface of the bottom seal portion 13, a biting piece 20 that is a bite of a parison is formed over substantially the entire length of the bottom seal portion 13.

  Also, the bottom wall 10 has a plurality of lateral ribs 15 (three in the left and right in the embodiment) vertically extending from the pair of rib pieces 14 constituting the bottom seal portion 13 in parallel with each other in opposite directions (both left and right directions). The bottom seal portions 13 are arranged alternately along the longitudinal direction. Each lateral rib 15 has a trapezoidal cross-sectional shape on the bottom wall 10 side rather than the lower end side, and is connected to a pair of rib pieces 14. The lateral ribs 15 extending in both the left and right directions are formed on the dome-shaped bottom wall 10. The tip of each of them reaches a virtual boundary circle 11 provided on the bottom wall 10 while being along. As shown in FIG. 5, the apex angle θ of each lateral rib 15 formed in a trapezoidal cross section is preferably in the range of 25 to 35 °, more preferably θ = 30 °, in order to increase the mechanical strength. is there.

The pair of rib pieces 14 constituting the bottom seal portion 13 has a horizontal hole-shaped biting portion 16 that bites into the other rib piece 14 from one rib piece 14 in a state in which the depression direction is alternately reversed. 13 are arranged alternately along the longitudinal direction.
That is, a plurality of lateral ribs 15 extending toward the virtual boundary circle 11 are formed on the one rib piece 14 side constituting the bottom seal portion 13, and the other rib piece 14 side facing this lateral rib 15 is formed. A plurality of lateral hole-shaped biting portions 16 are arranged at the position.

  In other words, the horizontal ribs 15 and the biting portions 16 are alternately arranged along the longitudinal direction in one rib piece 14, and the horizontal ribs 15 and the biting portions 16 are also arranged along the longitudinal direction in the other rib piece 14. The left and right lateral ribs 15 and the left and right biting portions 16 are disposed so as to be displaced from each other in a staggered manner.

  As shown in FIG. 5, each biting portion 16 has an oblong hole shape that is long horizontally. As shown in FIG. 4, of the six biting portions 16, the two biting portions 16c and 16d arranged at positions closest to the central container axis O are the first virtual circle C1 having a predetermined radius of curvature R1. The remaining four biting portions 16a, 16b, 16e and 16f are formed on the lower side near the biting piece 20 along the top, and the predetermined curvature radius R2 (R1> R2) smaller than the first virtual circle C1. ) And a second imaginary circle C2 formed on the upper side near the bottom wall 10.

  Further, as shown in FIG. 7, the depth of each biting portion 16 protrudes upward in the drawing (on the bottom wall 10 side), and the bulging height is within a height range in which the pins of the molding die can be forcibly removed. The bulging part 18 formed by this is provided. Thus, since each biting part 16 has a structure having a bulging part 18 protruding upward, as shown in FIG. 7, the resin material located immediately above the bulging part 18 is upward. As a result, the engagement portion 19 is formed in the portion directly above the biting portion 16d, in which the overlapping surface of the one rib piece 14 and the other rib piece 14 is curved into an undercut structure. And by arranging many such meshing parts 19 along the 1st virtual circle C1 and the 2nd virtual circle C2, the peeling-proof strength between a pair of rib pieces 14 is raised strongly. Is possible.

Further, by forming the biting portion 16 and the lateral rib 15 to face each other via the bottom seal portion 13 (a pair of rib pieces 14), a part of the bulging portion 18 of the biting portion 16 is formed in the lateral rib 15. Thus, the depth dimension of each biting portion 16 can be formed to be deeper than the entire thickness of the bottom seal portion 13 (the pair of rib pieces 14). Thereby, the crimping | bonding area of the outer layer 2 and the inner layer 3 in the bottom seal part 13 becomes large, and as a result, the crimping | compression-bonding degree between a pair of rib pieces 14 can be raised.
In addition, the depth dimension of each biting part 16 is good also as a structure deeper than the thickness of one rib piece 14, and a shallow dimension rather than the thickness of the bottom seal part 13 whole.

  Further, since the lateral ribs 15 connected to the pair of rib pieces 14 support the bottom seal portion 13 from the left and right directions, the bottom seal portion 13 is formed even if a large number of biting portions 16 are formed on the pair of rib pieces 14. It is possible to prevent a decrease in the mechanical strength of itself.

  In particular, even in a delamination container formed by laminating the outer layer 2 and the inner layer 3 formed into a bag shape that is flexible and deformable with a synthetic resin material that is incompatible with the outer layer 2, the meshing portion 19 While increasing the peel resistance between the pair of rib pieces 14, it is possible to prevent the mechanical strength of the bottom seal portion 13 itself from being lowered by the lateral ribs 15.

  As mentioned above, although the structure of this invention and its effect were demonstrated along the Example, embodiment of this invention is not limited to the said Example.

  In the above-described embodiment, an example in which three horizontal ribs 15 and three biting portions 16 are arranged on each of the pair of left and right rib pieces 14 has been described. However, the number of horizontal ribs 15 and biting portions 16 is not limited thereto. Instead, it can be appropriately changed according to the size of the container 1.

  INDUSTRIAL APPLICABILITY The present invention can be used in a wider area in the field of delamination containers generally called delamination bottles.

1: Container (lamination peeling container)
2: Outer layer 3: Inner layer 4: Body part 5: Mouth part 6: Air intake hole 7: Bottom part 8: Grounding part 9: Recessed part 10: Bottom wall 11: Virtual boundary circle 13: Bottom seal part 14: Rib piece 15: Side Rib 16: Biting part 16a-16f: Biting part 18: Swelling part 19: Engagement part 20: Biting piece O: Container shaft PL: Parting line

Claims (7)

A mouth tube portion (5) standing upright is provided at the upper end of a cylindrical body portion (4) whose lower end is closed by a bottom portion (7), and is connected to the outer layer (2) and the outer layer (2). A delamination container formed by laminating an inner layer (3) composed of an insoluble inner bag,
The bottom portion (7) includes a surrounding grounding portion (8) that constitutes a leg portion of the container (1), and a bottom wall (10) that is surrounded by the grounding portion (8) and sinks into the container (1). A pair of rib pieces (14) vertically cutting the bottom wall (10), and a vertical rib-shaped bottom seal portion (13) formed by superposition and pressure bonding in a ridge shape,
The bottom wall (10) is connected to both sides of the bottom seal portion (13) perpendicularly to the pair of rib pieces (14) and alternately along the longitudinal direction in which the bottom seal portion (13) extends. A plurality of lateral ribs (15) arranged in the
The bottom seal portion (13) is formed with a horizontal hole-shaped biting portion (16) that bites into the other from one of the pair of rib pieces (14) that has been pressure-bonded to each other.
The laminated peeling container, wherein the lateral rib (15) and the biting part (16) are arranged to face each other with the bottom seal part (13) interposed therebetween.   The delamination container according to claim 1, wherein a depth dimension of the biting portion (16) is deeper than a thickness of the bottom seal portion (13).   The delamination container according to claim 1 or 2, wherein the lateral rib (15) is formed in a trapezoidal cross section.   The delamination container according to any one of claims 1 to 3, wherein a bulging portion (18) is provided at the back of the biting portion (16).   The lateral ribs (15) are arranged on each side of the bottom seal part (13), and the biting parts (16) are arranged on both sides of the bottom seal part (13). 5. The delamination container according to claim 4.   Two biting portions (16c, 16d) close to the container shaft (O) are arranged on the upper end side of the bottom seal portion (13), and the remaining four biting portions (16a, 16b, 16e, 16f) are bottom seal portions (13). The delamination container according to any one of claims 1 to 5, which is disposed on a lower end side.   Two biting parts (16c, 16d) arranged on the upper end side are arranged on the first virtual circle (C1), and the remaining four biting parts (16a, 16b, 16e, 16f) are arranged on the first virtual circle (C1). The delamination container according to claim 6, which is disposed on the second imaginary circle (C2) having a smaller radius of curvature than.

Images