JP2013209144A - Blow container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To create a blow container which prevents the occurrence of bulging deformation and a bottom cracking phenomenon caused by an increase of internal pressure upon heating, and is excellent in an independent standing characteristic.SOLUTION: In a synthetic-resin-made blow container formed by direct blow molding from parison, a cylindrical tubular opening (2) is formed via a shoulder (3) to continuously rise from an upper end of a tubular body (4) of which the lower end is covered with a bottom (6). In the bottom (6), a center recessed part (8a) formed by denting a center of a bottom wall (8) inward like a dome is formed. In the center recessed part (8a), a vertical rib-like pinch-off part (9) extending along a parting line (PL) formed upon molding and a plurality of lateral ribs (10) extending to both directions perpendicularly from both lateral surfaces of the pinch-off part (9) are provided. The lateral ribs (10) extending in a first direction and the lateral ribs (10) extending in a second direction are configured to be alternately disposed.

Description

  TECHNICAL FIELD The present invention relates to a blow container made of a synthetic resin, and more particularly to a bottom wall structure of a blow container that suppresses bulging deformation of a bottom wall having a pinch-off portion and can enhance shape retention and self-supporting properties. .

For example, coffee and tea are mainly sold in a so-called canned beverage using a metal container such as aluminum.
Such canned beverages may be sold in a dedicated heating device (hot warmer, etc.) in a retail store such as a convenience store, or in a vending machine that is constantly heated. Due to the high thermal conductivity, there is a problem that depending on the heating temperature, it may become too hot and difficult to hold by hand.

  As an inexpensive container with few such problems, it is conceivable to use a synthetic resin container, but generally a PET container, which is the mainstream of synthetic resin containers, has low gas barrier properties and light shielding properties, so oxidation, ultraviolet rays, etc. Has a problem of quality degradation due to (deterioration of the content liquid).

  Therefore, as a synthetic resin container replacing the PET container, a direct blow container having a high gas barrier property and a light shielding property by having a laminated structure is expected.

  As such a direct blow container, for example, it is described in the following Patent Document 1, but the blow container (laminated blow housing) described in the same document is formed by blow molding of an extruded cylindrical multilayer parison. A light shielding layer 12 having a mouth portion 2, a shoulder portion 3, a body portion 4, and a bottom portion 5 on which a seal portion 6 is formed by a pinch-off of a parison and which exhibits a light shielding function inside an outer layer 11 forming an outer shell. Are laminated.

Japanese Unexamined Patent Publication No. 2011-213370

  However, when filling a blow container as shown in Patent Document 1 with coffee or tea and putting it in a dedicated heating device or vending machine and heating it, the bottom of the blow container is bulged and deformed due to an increase in internal pressure. As a result, there was a problem that the independence was lowered and there was a risk of falling.

  Further, there is a possibility that a bottom cracking phenomenon due to an increase in internal pressure may occur in the pinch-off portion.

  In order to solve the above-described problems in the prior art, the present invention prevents the occurrence of bulging deformation and bottom cracking due to an increase in internal pressure during heating in the blow container, thereby creating a blow container excellent in self-supporting properties. The task is to do.

Of the means for solving the above problems, the main configuration of the present invention is as follows.
A synthetic resin blow container in which a cylindrical mouth tube portion is erected continuously through a shoulder portion at the upper end of a cylindrical body portion whose lower end is closed at the bottom, and is directly blow-molded from a parison,
In the bottom, a central concave portion is formed in which the center portion of the bottom wall is recessed inwardly, and in the central concave portion, a longitudinal rib-like pinch-off portion extending along a parting line formed at the time of molding, A plurality of lateral ribs extending in both directions perpendicularly from both side surfaces of the pinch-off portion are provided, and lateral ribs extending in one direction and lateral ribs extending in the other direction are alternately arranged. is there.

In the blow container having the above main structure, by forming a plurality of horizontal ribs on both side surfaces of the pinch-off part formed of a vertical rib shape, and by alternately arranging the left and right horizontal ribs along the extending direction of the pinch-off part, Achieve bottom wall reinforcement.
In particular, in the configuration in which the horizontal ribs are arranged in the left and right rows in the pinch-off portion provided in the center of the bottom, it is difficult to increase the degree of reinforcement by connecting the left and right hollow portions formed on the back surface of the horizontal rib on the inner surface side of the container. However, when arranged alternately as in the present invention, the left and right hollow portions are not connected to each other on the back surface of the lateral rib and function independently, thereby effectively reinforcing the bottom wall. .

  According to another aspect of the present invention, in the first aspect of the present invention, an annular grounding portion is provided around the outer periphery of the central recess.

  In the above configuration, the self-supporting property of the container body is ensured.

  According to another aspect of the present invention, in the invention described in claim 1 or 2, the pinch-off portion and the protruding tip of the lateral rib are formed so as to be positioned between the bottom wall and the grounding portion. .

  In the above configuration, the phenomenon that the pinch-off portion and the lateral rib protrude downward from the grounding portion is achieved.

  According to another aspect of the present invention, in the invention described in claims 1 to 3, the number of lateral ribs is three on the left and right.

  The number of the lateral ribs is determined in consideration of the size of the container main body, the characteristics of the content liquid to be filled, and the like. However, with the above configuration, the strength of the bottom wall can be sufficiently increased.

  According to another aspect of the present invention, in the first to fourth aspects of the invention, the pitch dimension between adjacent lateral ribs is 5 mm or more and 20 mm or less.

When the pitch dimension between adjacent lateral ribs is set to be less than 5 mm, the formability or formability of the bottom part is deteriorated. Further, when the pitch dimension between the lateral ribs exceeds 20 mm, the pitch interval becomes too long, and the function as the lateral rib of reinforcing the bottom wall tends to be lowered.
For this reason, the pitch dimension between adjacent lateral ribs is preferably in the range of 5 mm or more and 20 mm or less, and a more preferable pitch dimension is about 10 mm.

  According to another aspect of the present invention, in the invention according to any one of claims 1 to 5, the container body is formed of a laminate having a plurality of synthetic resin layers, and a part of the laminate is formed. In other words, it is composed of a synthetic resin layer having at least one of a gas barrier property and a light shielding property.

  In the said structure, the blow container provided with one or both of gas-barrier property and light-shielding property can be achieved.

Since the present invention has the above-described configuration, the following effects can be obtained.
In the main configuration of the present invention, since the bottom wall can be effectively reinforced, it is possible to prevent the bottom wall from bulging and bottom cracking due to an increase in internal pressure during heating. A blow container can be provided.

  For example, even if a blow container filled with coffee or the like is permanently installed in a dedicated heating device such as a hot warmer, the container body can be prevented from falling due to the bulging and deforming of the bottom wall. In addition, unlike the conventional metal container, the container body does not become so hot that it cannot be gripped by hand.

  According to the second aspect of the present invention, in the configuration in which the annular grounding portion is provided on the outer peripheral side of the central recess, the container main body can be made independent.

  According to the third aspect of the present invention, in the configuration in which the protruding tips of the pinch-off part and the lateral rib are formed so as to be positioned between the bottom wall and the grounding part, the pinch-off part and the lateral rib are below the grounding part. The blow container that does not interfere with the self-supporting property of the container body and stably stand-alone can be obtained.

  In the configuration according to the fourth aspect in which the number of the lateral ribs is three on the left and right, the bottom wall can be reinforced reliably and sufficiently.

  Further, in the configuration in which the pitch dimension between adjacent lateral ribs is 5 mm or more and 20 mm or less according to claim 5, the formability or formability of the bottom wall is enhanced and the lateral ribs have an appropriate pitch dimension. Since it is disposed and the function as a lateral rib is sufficiently exhibited, it is possible to provide a blow container that is less prone to bulging deformation and bottom cracking.

  The container body according to claim 6 is formed of a laminate having a plurality of synthetic resin layers, and a part of the laminate is constituted by a synthetic resin layer having at least one of a gas barrier property and a light shielding property. In this case, it is possible to suppress the deterioration of the quality of the content liquid filled in the blow container, the deterioration of the quality of the content liquid due to ultraviolet rays, and the like.

It is a front view which shows the Example of the blow container of this invention. It is a bottom view of a blow container. It is a perspective view which shows the bottom part of a blow container. It is the expanded sectional view of the bottom part of the blow container which shows the state seen from the arrow direction while cut | disconnecting by the IV-IV line of FIG. FIG. 5 is an enlarged cross-sectional view of the bottom portion of the blow container showing a state cut along the VV line of FIG.

Embodiments of the present invention will be described below with reference to the drawings.
1 is a front view showing an embodiment of the blow container of the present invention, FIG. 2 is a bottom view of the blow container, FIG. 3 is a perspective view showing the bottom of the blow container, and FIG. 4 is cut along the line IV-IV in FIG. And the expanded sectional view of the bottom part of the blow container which shows the state seen from the arrow direction, FIG. 5 cut | disconnects by the VV line of FIG. 2, and shows the state seen from the arrow direction (direction different from FIG. 4). It is an expanded sectional view of the bottom part of a blow container.

  A container main body 1 constituting a blow container shown in the present invention closes a cylindrical mouth tube portion 2, a shoulder portion 3 formed in a diameter-expanded shape from the mouth tube portion 2, a body portion 4, and a lower end of the body portion 4. The bottom portion 6 is configured. At the center of the body portion 4 in the height direction, a waist portion 4A formed by gradually reducing the diameter of the body portion 4 from the shoulder portion 3 and the bottom portion 6 is provided.

  The container body 1 is formed of a laminate 5 formed by laminating a plurality of synthetic resin layers. More specifically, as shown in FIG. 4 and FIG. 5 in which a part of the laminated body 5 is extracted and enlarged, an outer layer 5a that forms an outer shell over the entire height range of the container body 1 and an inner side are provided. It is formed in a three-layer structure including an inner layer 5b and an adhesive layer 5c provided between the inner layer 5b and the outer layer 5a and the inner layer 5b.

  The outer layer 5a is made of, for example, a synthetic resin material such as polyethylene or polypropylene, and the inner layer 5b is made of, for example, an ethylene / vinyl alcohol copolymer resin (EVOH) or the like that exhibits excellent gas barrier properties. The adhesive layer 5c is made of, for example, a modified polyolefin adhesive resin such as Admer (registered trademark).

  The inner layer 5b of the laminate 5 constituting the container body 1 of the present invention is not limited to a layer having gas barrier properties, and is constituted by, for example, a colored resin layer having light shielding properties according to the characteristics of the content liquid to be filled. May be. The laminated body 5 is not limited to a three-layer structure, and may have a multilayer structure in which, for example, both a gas barrier layer and a light-shielding colored resin layer are laminated.

  The container body 1 becomes a bottle-shaped container by sandwiching one end of an extruded cylindrical multilayer parison (original shape of the laminate 5) with a mold and performing blow molding (direct blow) by blowing compressed air. . At this time, the pinch-off blade of the mold cuts off the lower end portion of the co-extruded multilayer parison, whereby a vertical rib-shaped pinch-off portion 9 is formed on the bottom wall 8 of the bottom portion 6. Note that a parting line PL formed when the multilayer parison is sandwiched between molds is formed on the surface of the container body 1.

  As shown in FIG. 3, the bottom 6 includes a central recess 8a in which the bottom wall 8 is recessed in a dome shape toward the inside, and a grounding portion 7 provided in a ring around the central recess 8a. Have. The pinch-off portion 9 is formed in the central recess 8a along the parting line PL. The pinch-off portion 9 is integrally formed with a plurality of lateral ribs 10 extending in parallel along opposite directions (both left and right directions) perpendicular to both side surfaces. Is formed. Note that the plurality of such horizontal ribs 10 are formed by a mold during blow molding.

  As shown in FIG. 5, the lateral rib 10 is formed as a hollow rib composed of double walls opposed to each other with a slight slit-shaped gap 11. A large horizontal rib 10 can be formed in the vertical direction.

  In the blow container shown in this embodiment, as shown in FIG. 2, three lateral ribs 10 are formed on one side surface (right side surface) of the pinch-off portion 9, and three are similarly formed on the other side surface (left side surface). These horizontal ribs 10 are formed. The right lateral ribs 10 on the one side and the left lateral ribs 10 on the other side are vertically arranged on both sides of the pinch-off portion 9 extending linearly and are alternately arranged. In this configuration, the left lateral rib 10 is disposed between the lateral ribs 10 adjacent to each other on the right side of the pinch-off portion 9. For this reason, the portion on the right side where the lateral rib 10 is not formed and is physically weak (the portion between the adjacent lateral rib 10 and the lateral rib 10) It is possible to compensate with the lateral rib 10.

In addition, by adopting a configuration in which the left and right lateral ribs 10 are alternately arranged, the left and right lateral ribs 10 are not connected to each other on the back side of the bottom wall 8 and are present independently of each other. With this configuration, the individual horizontal ribs 10 are less likely to receive interference with each other, and the respective functions can be sufficiently exhibited.
Therefore, the mechanical strength of the whole bottom wall 8 by the function of the whole horizontal rib 10 improving can be improved. That is. Swelling deformation and bottom cracking of the bottom wall 8 due to an increase in internal pressure during heating can be more effectively prevented.

  Further, in the present invention, the pitch dimension W between the lateral ribs 10 adjacent to each other along the direction in which the pinch-off portion 9 extends is set to 10 mm, which is in the range of 5 mm to 20 mm. Thereby, it becomes possible to improve the moldability or formability of the bottom portion 6 having the plurality of lateral ribs 10, and the function of the lateral ribs 10 formed on the bottom wall 8 can be sufficiently exhibited.

  That is, when the pitch dimension W between the adjacent horizontal ribs 10 is less than 5 mm, the formability or formability of the entire bottom portion 6 including the plurality of horizontal ribs 10 is deteriorated. The function of reinforcing the bottom wall 8 during this period is difficult to be exhibited and the function of reinforcing the bottom wall 8 during this period is likely to be reduced. However, by forming the lateral ribs 10 within the above range, a plurality of lateral ribs 10 are formed as designed, These functions can be sufficiently exerted, and it is possible to prevent the occurrence of bulging deformation and bottom cracking due to an increase in internal pressure during heating. It can be set as the blow container excellent in stability at the time of self-supporting.

  As shown in FIGS. 4 and 5, the lower ends (protruding tips) of the pinch-off part 9 and the lateral rib 10 are located between the bottom wall 8 and the grounding part 7 so as not to project downward from the grounding part 7. It is formed in a state. With this configuration, the grounding portion 7 is surely grounded, and the stability when the container body 1 is self-supporting can be enhanced.

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.
For example, in the above-described embodiment, an example in which three horizontal ribs 10 are arranged on both sides of the pinch-off part 9 (total of six) is shown, but the number of the horizontal ribs 10 is three or less. Alternatively, the configuration may be three or more on the left and right. In addition, the minimum number of the horizontal ribs 10 is a total of three configurations, two on one of the left and right sides, and one on the other side. It is possible to strengthen the bottom wall 8 while maintaining balance.

  The blow container of the present invention is required to have a gas barrier function and a light shielding function and can be used in a wider range of applications in the field of synthetic resin blow containers for filling the liquid contents sold in a heated state.

DESCRIPTION OF SYMBOLS 1; Container body 2; Mouth part 3; Shoulder part 4; Trunk part 4A; Waist part 5; Laminate body 5a; Outer layer 5b; Inner layer 5c: Adhesive layer 6; Bottom part 7; 9; Pinch-off part 10; Horizontal rib PL; Parting line W; Pitch dimension of horizontal rib

Claims (6)

A cylindrical mouth tube portion (2) is erected on the upper end of a cylindrical body portion (4) whose lower end is closed with a bottom portion (6) through a shoulder portion (3), and is directly blow-molded from a parison. A blow container made of synthetic resin,
A central recess (8a) is formed in the bottom (6), with the center of the bottom wall (8) recessed in a dome shape inward, and the parting formed in the central recess (8a) during molding A longitudinal rib-like pinch-off portion (9) extending along the line (PL) and a plurality of lateral ribs (10) extending in both directions perpendicularly from both side surfaces of the pinch-off portion (9) and extending in one direction A blow container characterized in that the lateral ribs (10) and the lateral ribs (10) extending in the other direction are alternately arranged.   The blow container according to claim 1, wherein an annular grounding portion (7) is provided around the outer peripheral side of the central recess (8a).   The blow container according to claim 1 or 2, wherein the protruding tips of the pinch-off part (9) and the lateral rib (10) are formed so as to be positioned between the bottom wall (8) and the grounding part (7).   The blow container according to any one of claims 1 to 3, wherein the number of horizontal ribs (10) is three on both the left and right sides.   The blow container according to any one of claims 1 to 4, wherein a pitch dimension (W) between adjacent lateral ribs (10) is 5 mm or more and 20 mm or less.   The container body (1) is formed of a laminate (5) having a plurality of synthetic resin layers, and a part of the laminate (5) is composed of a synthetic resin layer having at least one of gas barrier properties and light shielding properties. The blow container according to any one of claims 1 to 5.

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