JP5648955B2 - Synthetic resin housing - Google Patents

Description

  The present invention relates to a synthetic resin casing, and more particularly to a synthetic resin casing that is resistant to a longitudinal load during loading and prevents buckling deformation easily.

  Conventionally, polyethylene terephthalate (hereinafter referred to as PET) resin biaxially stretched blow-molded casings, so-called PET bottles, have excellent transparency, mechanical strength, heat resistance, gas barrier properties, etc., and are used for various beverages. Widely used as a container.

  Conventionally, there is a so-called high-temperature filling method for filling a PET bottle with content liquids such as fruit juices and teas that require sterilization, and the contents liquid is filled into the casing at a temperature of about 90 ° C. Then, the cap is sealed and then cooled, and the inside of the housing is in a considerably reduced pressure state.

  For this reason, for applications involving high-temperature filling as described above, for example, as described in Patent Document 1, a so-called reduced-pressure absorption panel is formed, which is a region that can be easily deformed in a depressed state by depressurization intentionally in the trunk. Then, the vacuum absorbing function is exhibited by deforming the vacuum absorbing panel into a depressed shape during decompression.

  By the way, in the step of filling the content liquid and the like, the casing is transported using the transport line, but the front and rear casings may collide with each other during the transport. In addition, when sold in a vending machine, the upper and lower housings stacked and stored in a horizontally stacked state in the vending machine may come into contact with each other. At this time, if a collision or abutment occurs between the reduced pressure absorption panels formed with the body portion, the body portion may be deformed and the reduced pressure absorption function of the reduced pressure absorption panel may be impaired.

  On the other hand, there are severe restrictions on the maximum outer diameter of the vending machine housing due to clogging problems. For this reason, when adjusting the content volume of the content liquid filled in the casing, it is necessary to control the dimensions of the other portions while maintaining the maximum outer diameter dimension.

  Therefore, the following structure is adopted as a countermeasure when the above-described collision or contact occurs and as a means for adjusting the internal capacity while maintaining the maximum outer diameter of the housing. .

  FIG. 3 is a front view showing an example of a conventional synthetic resin casing, FIG. 4 is a cross-sectional view showing a partially enlarged outline of a step portion formed on the casing, and A is a state before deformation, B shows the state after buckling deformation.

  In this casing 101, a so-called reduced pressure absorption panel 108a, which is a region that can be easily deformed in a depressed state by depressurization, is formed in the body portion 104, and the reduced pressure absorption panel 108a is deformed into a depressed shape at the time of depressurization. Therefore, a good appearance is maintained.

  In this housing 101, the outer diameter of the upper and lower body portions 104b, 104b located on both sides of the reduced pressure absorption panel 108a is set to the maximum outer diameter defined for vending machines, and the reduced pressure absorption panel is formed during molding. The content liquid to be filled is adjusted to have a predetermined internal volume by controlling the outer diameter of the central barrel 104a formed with 108a within the range of the maximum outer diameter or less.

  And by adopting a structure in which the outer diameter of the upper and lower body parts 104b, 104b is always larger than that of the central body part 104a, the adjacent casings 101 collide or come into contact with each other. However, a collision occurs only between the upper and lower body parts 104b and 104b, and the central body part 104a cannot be directly collided with each other. The vacuum absorption function is maintained.

JP 2005-8155 A

  Such a casing 101 is generally stored and transported in a state where it is stacked in the vertical direction. However, a load is applied to the casing 101 in a vertical direction (also referred to as an axial direction or a vertical direction of the casing). When a load (hereinafter referred to as a longitudinal load) is applied, there is a problem that it is easily buckled and deformed.

  The buckling deformation of the casing 101 due to the longitudinal load is most likely to occur in the upper and lower step portions 107 and 107 formed at the boundary between the upper and lower body portions 104b and 104b and the central body portion 104a. The step portion 107 is a portion having the weakest buckling strength as compared with the central body portion 104a and the upper and lower body portions 104b and 104b, and the buckling deformation as shown in FIGS. To do.

  That is, in the state where the vertical load is not applied, the upper and lower stepped portions 107 and 107 maintain the normal state shown in FIG. 4A, but the casing 101 has a large vertical load W exceeding the allowable range of the stepped portion 107. When applied, as shown in FIG. 4B, the stepped portion 107 that cannot withstand the longitudinal load W is inverted and buckling deformation occurs.

  As a general prior art regarding the prevention of buckling deformation due to such a longitudinal load, Patent Document 1 discloses that a part of a convex or concave reinforcing rib extending in the vertical direction between adjacent panel portions disappears. In other words, a structure is disclosed that is formed so as to be discontinuous, and the disappearing portions of the reinforcing ribs provided in the adjacent body portions are positioned at different heights with respect to the vertical direction.

  If the structure described in Patent Document 1 is described with reference to FIG. 3 of the present specification, the column portion (body main body) 109 between the vacuum absorption panels 108a is given rigidity in the axial direction, thereby providing a column portion. (Body body) 109 is intended to obtain a high buckling strength as a whole, and a structure for positively reinforcing the stepped portion 107 having a low buckling strength is not disclosed.

  In order to solve the above-described problems in the prior art, the present invention positively reinforces the stepped portion formed at the boundary between the body portions having different outer diameter dimensions, and generates buckling deformation due to the inversion of the stepped portion. It is an object to create a synthetic resin casing that can be prevented.

Of the means for solving the above problems, the main configuration of the present invention is as follows.
In a biaxially stretched blow molded synthetic resin casing having a mouth tube portion, a shoulder portion gradually expanding from the mouth tube portion, a bottomed tubular body portion continuous from the shoulder portion, and a bottom portion,
The body portion has a panel disposition area constituted by a plurality of flat walls, and a maximum diameter area having an outer diameter larger than that of the panel disposition area at positions on both upper and lower sides of the panel disposition area. And
The panel disposition area is formed with a regular cross-sectional shape of a flat cross section , a flat part is provided with a vacuum absorbing panel, and a column part is provided between adjacent vacuum absorbing panels.
A sloped stepped portion is provided at the boundary between the panel placement region and the maximum diameter region, and a plurality of ribs that prevent buckling deformation of the stepped portion due to a longitudinal load are slanted between the stepped portion and the column portion. It is said that it is arranged in a bowl shape .

In the casing having the above-described configuration, the plurality of ribs impart high buckling strength to the step portion between the panel arrangement region and the maximum diameter region. In particular, if there is a dimensional difference between the outer diameter dimensions of the panel placement area and the maximum diameter area as described above, the vertical load is concentrated on the stepped portion caused by the dimensional difference, and the stepped portion is reversed as shown in FIG. 4B. Buckling deformation is likely to occur. In the above-described configuration, the rib functions as a flange that supports the step portion, and prevents buckling deformation due to the inversion of the step portion.
In addition, by forming the ribs on the pillars with high rigidity in the vertical direction, rather than on the vacuum absorption panels, it is possible to ensure that the original function of the ribs can be fully exerted by firmly supporting the stepped parts and preventing their reversal. Is done.

Another configuration of the present invention is that, in the above configuration, the stepped portions are formed at both ends in the vertical direction of the panel arrangement region.
In the above configuration, the buckling strength of the upper and lower stepped portions formed at both ends in the vertical direction of the panel arrangement region can be increased, respectively, and the overall body can be resistant to buckling deformation.

According to another configuration of the present invention, in any one of the above configurations, a step portion is provided at a position close to the panel arrangement region.
In the above configuration, since the stepped portion is prevented from buckling deformation, the operation of the reduced pressure absorption panel in the panel disposition area provided in the vicinity thereof is ensured, and the function is reliably exhibited.

According to another configuration of the present invention, in any one of the configurations described above, stepped portions are provided on both upper and lower sides of the panel disposition region, and ribs are disposed between the upper and lower stepped portions and the column portions. is there.

According to another configuration of the present invention, in any of the above configurations, the rib has a convex shape that protrudes from the inside of the housing toward the outside.

Since the present invention has the above-described configuration, the following effects can be obtained.
In the main configuration of the present invention, a plurality of ribs formed at the stepped portion at the boundary between the panel arrangement region and the maximum diameter region reinforce the stepped portion to increase its buckling strength, and buckle by reversing the stepped portion. Prevents deformation. Thereby, the progress of the further buckling deformation triggered by the step portion can be prevented.

  Also, by providing the function of the reduced pressure absorption panel, it is possible to deform the reduced pressure absorption panel into a depressed shape at the time of pressure reduction and maintain a good appearance. And since it becomes possible to support a decompression absorption panel reliably by the pillar part which has high rigidity, the smooth deformation | transformation operation | movement of the decompression absorption panel at the time of decompression is realizable.

  In addition, since the rib is formed on the pillar portion having high rigidity, the function of the rib as the reinforcing member can be surely achieved, so that the buckling strength of the step portion can be further increased. It becomes possible to prevent buckling deformation more reliably. Therefore, it is possible to provide a housing that is more resistant to buckling deformation.

  Further, in the configuration in which the stepped portions are formed at both ends in the vertical direction of the panel arrangement region, buckling deformation at the upper stepped portion and the lower stepped portion can be prevented. In addition, since the maximum diameter area consisting of the maximum outer diameter can be provided at the upper and lower positions of the chassis, it is possible for the maximum diameter areas on both sides to bear the collision between the chassis during transportation, and the center panel A direct collision between the arrangement areas can be avoided. Further, the inner capacity can be adjusted by controlling the outer diameter dimension of the panel arrangement area in a state where the outer diameter dimension of the maximum diameter area on both sides is set to the maximum outer diameter dimension.

  In addition, in the configuration in which the step portion is provided at a position close to the panel arrangement area, the operation of the vacuum absorption panel provided in the panel arrangement area is ensured and the function is reliably exhibited. The reduced pressure absorption panel can be reliably deformed into a depressed shape, and a good housing appearance can be maintained.

It is a front view of the synthetic resin housing which shows the Example of this invention. It is a schematic plane sectional view in the II-II line of FIG. It is a front view which shows an example of the conventional synthetic resin casing. It is the longitudinal cross-sectional view which expands and shows the outline of the level | step-difference part provided in the housing partially, A is the state before a deformation | transformation, B is the state after buckling deformation.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a plan view of a synthetic resin casing showing an embodiment of the present invention, and FIG. 2 is a schematic cross-sectional view taken along line II-II in FIG.

The casing 1 shown in this embodiment is a biaxial stretch blow-molded product made of PET resin having a mouth tube portion 2, a shoulder portion 3, a cylindrical body portion 4, and a bottom portion 5. In addition, the material used for the housing 1 is not limited to PET, For example, polypropylene (PP) etc. may be sufficient.
A panel disposition region 4a is provided at a central position in the longitudinal (axial) direction of the body portion 4, and maximum diameter regions 4b and 4b are integrally provided at positions on both upper and lower sides across the panel disposition region 4a. ing. The outer diameter dimension of the body portion 4 is the maximum outer diameter dimension L of the maximum diameter areas 4b, 4b provided on both sides, and the outer diameter dimension of the panel arrangement area 4a provided in the center is the maximum diameter area 4b, It is formed smaller than the outer diameter L of 4b. In addition, inclined step portions 7 and 7 are formed at positions on both sides in the longitudinal direction of the casing 1 and at the boundary between the panel arrangement region 4a and the maximum diameter regions 4b and 4b.

  The outer diameter L of the maximum diameter regions 4b, 4b is set equal to the maximum outer diameter that is allowed to be loaded into the vending machine, and the housing 1 is sufficiently used for vending machines. It can be done.

  As described above, by setting the outer diameter L of the maximum diameter areas 4b and 4b to be larger than the outer diameter dimension of the panel arrangement area 4a, the outer diameter dimension of the maximum diameter areas 4b and 4b can be increased. Even when stacked and stored in a stacked state, only the maximum diameter regions 4b and 4b on both sides having large outer diameters can collide or abut each other between the adjacent casings 1 in the front-rear or top-bottom direction. It is possible to prevent the central panel disposition region 4a from directly colliding with or coming into contact with each other. Therefore, it is possible to avoid a direct collision or contact between the below-described reduced pressure absorption panels provided in the panel arrangement region 4a, and to prevent the deformation of the reduced pressure absorption panel and sufficiently exhibit the reduced pressure absorption function. Can be maintained.

  The panel disposition region 4a is formed with six flat walls 8, and six flat vacuum absorbing panels 8a are formed in each flat wall 8 so as to be recessed in parallel. And the column part 9 which bears the rigidity and buckling strength of the housing 1 is formed along the vertical direction between the adjacent decompression absorption panels 8a. As shown in FIG. 2, the flat cross-sectional shape of the panel arrangement region 4a in the present embodiment is a regular hexagon.

  A circumferential groove rib 6 is formed in the upper maximum diameter region 4b to increase the surface rigidity and to have high shape retention. In this embodiment, the lower maximum diameter region 4b is not provided with a circumferential groove rib, but the lower maximum diameter region 4b is provided with the same peripheral groove rib 6 as the upper side. It may be a thing.

  As shown in FIG. 1, a plurality of ribs 10 are formed on the stepped portion 7. Each rib 10 is a convex shape that protrudes from the inside of the housing 1 toward the outside, and is provided in a slanting shape between the step portion 7 and the column portion 9 in an oblique manner. . The ribs 10 are arranged at six positions around the stepped portion 7 at equal intervals (also referred to as equal central angles). The plurality of ribs 10 function as reinforcing members that increase the buckling strength of the stepped portion 7 and prevent buckling deformation caused by the stepped portion 7 being inverted by a longitudinal load.

  The plurality of ribs 10 are formed in the column portion 9 having a high buckling strength that is not easily deformed even when a large longitudinal load is applied to the housing 1. Thereby, the pillar part 9 can support the some rib 10 firmly, raises the buckling strength of the whole step part 7, and prevents the buckling deformation in the step part 7 more effectively.

  Even in the case 1 without the plurality of ribs 10, as long as the vertical load acts on the flat wall 8 constituting the regular hexagonal panel disposition region 4 a, The installation region 4a is less likely to buckle. However, in reality, the longitudinal load cannot act evenly on each flat wall 8, and the longitudinal load always acts in a biased state. As described above, when the plurality of ribs 10 are not formed on the stepped portion 7 of the casing 1 when the vertical load acts on the panel arrangement region 4a of the casing 1 in a biased state as described above. On the other hand, the stepped portion 7 is inverted at the biased position to cause buckling deformation. Then, one of the regular hexagonal corners a, b, c, d, e, and f that constitutes the panel arrangement region 4a located immediately below, or any one of the planar walls 8 is connected to the outside of the casing 1. The force F1 in the direction of expanding or the force F1 ′ in the direction of contracting inward is applied.

  For example, as shown in FIG. 2, if a force F1 in the direction of expanding to the outside of the casing 1 is applied to the corner a, the flat surfaces 8 and 8 on both sides adjacent to the corner a are expanded outward force F1. On the other hand, in the corners b and f following the flat surfaces 8 and 8, an inward force F1 ′ contracting inside the housing 1 is generated as an internal stress. Similarly, the corner b and the corner f function as a resistance of the inward force F1 ′ that the flat surfaces 8 and 8 on both sides adjacent to the corner b and the corner f contract, so that the corner c and the corner e are enlarged on the contrary. An outward force F1 is generated as an internal stress. Thereafter, the same applies to the corners a, c, and e, and an outward force F1 that expands outside the casing 1 acts on the corners a, c, and e. The force F1 ′ is applied.

  Due to such an action, the casing 1 which has acted in a state where the longitudinal load is biased has a panel arrangement region 4a having a substantially equilateral triangular cross section with three corners a, c and e as vertices (the broken line in FIG. 2). It will be deformed as shown in FIG.

  However, in the configuration in which the plurality of ribs 7 are formed in the stepped portion 7 as described above, buckling deformation due to the inversion of the stepped portion 7 is prevented, so the corners a, b, c, and An outward force F1 that expands outward or an inward force F1 ′ that contracts inward does not act on d, e, and f or each flat wall 8. Therefore, it becomes possible to maintain the regular hexagonal shape of the panel arrangement region 4a, that is, to maintain a good appearance of the housing 1. In particular, since it is possible to suppress the deformation of the corners a, c, and e protruding outward as shown in FIG. 2, the panel arrangement region 4a between the adjacent casings 1 at the time of transportation or the like. It is possible to make it difficult for collisions and contact between each other.

  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 embodiment, the plane cross-sectional shape of the panel arrangement region 4a has been described as a regular hexagonal shape, but the present invention is not limited to this, and the object of the present invention, that is, the stepped portion 7 is reinforced. In view of the purpose of preventing the bending deformation, any configuration having the stepped portion 7 and the plurality of ribs 10 may be used, and the plane cross-sectional shape of the panel disposition region 4a may be other shapes such as a regular triangle shape, a regular square shape, A regular polygonal shape such as a regular pentagonal shape or a regular octagonal shape may be used, or a cylindrical shape may be employed.

  Therefore, providing the reduced pressure absorption panel 8a is not an essential requirement as long as the object of the present invention is achieved. However, the configuration having the reduced pressure absorption panel 8a as described above retains a good appearance of the housing 1 by deforming the reduced pressure absorption panel 8a into a depressed shape at the time of reduced pressure and exhibiting the reduced pressure absorption function. It is preferable at the point which can provide a function.

  Moreover, although the said Example showed and demonstrated the case where the rib 10 was formed in each of the upper and lower level | step-difference parts 7, 7, this invention is not limited to this. For example, in the case where the panel arrangement region 4a is an inclined casing 1, the stepped portion is formed only at one boundary between the smallest outer diameter portion and the maximum outer diameter portion 4b in the panel arrangement region 4a. 7 is formed, and the casing 1 having no stepped portion 7 is formed at the other boundary portion between the largest outer diameter portion and the largest outer diameter portion 4b in the panel arrangement region 4a. The casing 1 having the configuration can be configured such that the rib 10 is provided only on the stepped portion 7 formed at one boundary.

  In the above configuration, the buckling strength of the stepped portion 7 where at least the rib 10 is formed can be increased, and buckling deformation at the stepped portion 7 can be prevented.

  The synthetic resin casing of the present invention has increased buckling strength at the stepped portion formed at the boundary of the casing body with different outer diameter dimensions, and it is necessary to load the casing at the time of storage and transportation Applications can be expanded in a wider area.

DESCRIPTION OF SYMBOLS 1; Housing 2; Mouth part 3; Shoulder part 4; Body part 4a; Panel arrangement | positioning area | region 4b; Maximum diameter area | region 5; Bottom part 6; Circumferential groove rib 7; ; Pillar part 10; rib

Claims (5)

A mouth tube portion (2), a shoulder portion (3) gradually expanding from the mouth tube portion (2), a body portion (4) continuous from the shoulder portion (3), and a bottom portion (5). In a biaxial stretch blow molded synthetic resin casing,
The body portion (4) is provided with a panel disposition region (4a) having a plurality of flat walls (8) , and the panel disposition at positions on both upper and lower sides of the panel disposition region (4a). A maximum diameter region (4b) having a larger outer diameter than the region (4a),
The panel providing area (4a) has a flat cross section are formed in a regular polygon, the vacuum in the flat wall (8) absorption panel (8a) is provided, the pillar portion between adjacent said vacuum panels (8a) ( 9)
A sloped stepped portion (7) is provided at the boundary between the panel arrangement region (4a) and the maximum diameter region (4b), and a plurality of buckling deformations of the stepped portion (7) due to a longitudinal load are prevented. A synthetic resin casing characterized in that the rib (10 ) is disposed in a slanting manner in a bowl shape between the step portion (7) and the column portion (9) .   The synthetic resin casing according to claim 1, wherein the stepped portion (7) is formed at both longitudinal end portions of the panel arrangement region (4a).   The synthetic resin casing according to claim 1 or 2, wherein a step portion (7) is provided at a position close to the panel arrangement region (4a). The step (7) is provided on both upper and lower sides of the panel arrangement region (4a), and the rib (10) is arranged between the upper and lower step (7) and the column (9). The synthetic resin housing as described in any one of Claims. The synthetic resin housing according to any one of claims 1 to 4, wherein the rib (10) has a convex shape protruding from the inside of the housing (1) toward the outside.

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