JP5943249B2 - Synthetic resin square housing - Google Patents

Description

  The present invention relates to a rectangular prismatic body made of synthetic resin represented by a biaxially stretched blow-molded bottle made of polyethylene terephthalate resin, in which a vacuum absorbing panel is formed on a body part.

  Synthetic resin casings such as polyethylene terephthalate (hereinafter referred to as PET) resin are widely used for beverages such as water, sports drinking water, tea and juice. Patent Document 1 describes, as an example, a square-shaped casing in which a flat cross-sectional shape of a body portion is rounded, which is a representative example of a rectangular casing (see FIG. 11).

  The casing shown in FIG. 11 is a casing 1 made of a synthetic resin and biaxially stretched and blow-molded. The upper end of the casing 2 is connected via a shoulder 3 having a tapered rectangular tube shape at the upper end. The body portion 4 having the bottom portion 8 continuously provided at the lower end has a substantially square square cylinder shape that is chamfered, and is formed by a corner wall 6 that is a portion where the body portion 4 is chamfered with the peripheral wall 5.

  And in this housing | casing 1, although the decompression absorption panel 10 is formed in depression shape in each surrounding wall 5, in the use filled with the content liquid at about 80-90 degreeC for the purpose of sterilization, the inside is filled at the time of filling. The reduced pressure absorption panel 10 bulges and deforms toward the outside of the housing 1 because it may be in a pressurized state. However, after filling, the inside is in a reduced pressure state as the temperature of the content liquid decreases, so the reduced pressure absorption The panel 10 is depressed and deformed inward of the housing 1.

  In this way, the reduced pressure absorption panel 10 is bulged and depressed, thereby absorbing the change in the internal pressure within the housing and preventing local deformation of the body 4 other than the reduced pressure absorption panel 10, or appearance. A function of making it inconspicuous, that is, a function of absorbing a pressure change in the housing 1 (internal pressure absorption function) is exhibited.

JP 2001-180637 A

  On the other hand, this type of enclosure is used in large quantities for food applications, etc., and in many cases is disposable. Therefore, from the viewpoint of saving resources and reducing costs related to packaging, it is possible to reduce the cost of packaging. There is a demand for weight reduction.

  However, this thinning is naturally limited in terms of the rigidity of the casing and the moldability of the casing, and the casing formed with the above-described reduced-pressure absorption panel has a reduced thickness, so The vacuum absorbing panel bulging and deforming outward in the state) is not depressed and deformed inward in the decompressed state due to a decrease in temperature after filling, and the state bulging outward (bulging deformation state) is maintained. There is a problem that the design of the exterior of the housing is impaired.

  In particular, such a problem becomes more serious when a single reduced pressure absorption panel is formed with a large area in order to fully exhibit the internal pressure absorption function.

  In order to solve the above-described problems in the prior art, the present invention provides a square-shaped synthetic resin casing whose body is thinned. Achieving bulging deformation that does not cause bending deformation and solving the problem that the bulging deformation state is maintained even when the temperature drops (depressurized state) by improving the shape of the rectangular casing, particularly the reduced pressure absorption panel Is a technical issue.

Of the means for solving the above technical problems, the main configuration of the present invention is:
A decompression absorption panel formed in a depressed shape is provided on the peripheral wall of the body portion formed into a rectangular tube shape having four flat peripheral walls and four corner walls connecting the peripheral walls in a square shape. In the synthetic resin square-shaped housing,
A plurality of horizontal convex ribs having a convex cross section formed at a certain interval in the vertical direction are arranged on the bottom surface of the vacuum absorbing panel. thereby forming a dimension in different sizes, characterized in that the entire lateral convex rib is formed with a constant protrusion size, including a central portion and two end portions, in which say.

  In the square bottle made of the synthetic resin of the present invention having the above-described configuration, the vertical dimension of the lateral convex rib provided on the vacuum absorbing panel is set to a different dimension between the central part and both end parts, thereby reducing the pressure against swelling and volume reduction. While ensuring the free deformation operation of the absorption panel, at the time of high temperature filling (pressurized state), while achieving the bulging deformation that does not cause buckling deformation to the outside of the vacuum absorption panel, The reduced pressure state) promotes the progress of the inward deformation of the vacuum absorbing panel.

  In particular, when the shape of the laterally convex rib formed in the vacuum absorbing panel is a so-called straight type laterally convex rib having the same vertical dimension over its entire length, the vacuum absorbing panel is inverted during high-temperature filling (pressurized state). The shape after reversal is held semipermanently, and even when the temperature drops (depressurized state), it is difficult for deformation to occur, and it may not return to the original shape before deformation. . However, by forming the vertical dimension of the central part of the laterally convex rib with a dimension different from the vertical dimension of the both end parts, such suppression of the inversion of the vacuum absorbing panel is reliably achieved.

  According to another aspect of the present invention, in the first aspect of the present invention, the vertical dimension of the central portion of the laterally convex rib is narrower than the vertical dimension of both end portions.

  In the above configuration, the bulging deformation that does not cause the buckling deformation to the outside of the reduced pressure absorption panel at the time of high temperature filling (pressurized state), and after turning to the temperature lowering (depressurized state) Achieving the promotion of depression deformation of the vacuum absorption panel, but especially the absorption capacity at the same vacuum strength is large, i.e., improperly deformed compared to straight type lateral convex ribs with the same vertical dimension at the center and both ends. Since the reduced pressure absorption capacity can be increased, a larger reduced pressure absorption function can be exhibited, and a sure depression deformation of the reduced pressure absorption panel can be achieved.

  Furthermore, another configuration of the present invention is the invention according to claim 1 or 2, wherein the planar shape of the laterally convex rib is a substantially concave lens shape in which the upper and lower sides are recessed in a concave arc shape in a direction approaching each other. It is said that.

  In the above configuration, the upper and lower sides are formed in a concave arc shape, thereby achieving a smoother deformation operation as compared with a case where the upper and lower sides are formed in a linear shape.

  Further, according to another aspect of the present invention, in the invention according to any one of claims 1 to 3, a circumferential groove that is recessed inward is formed in the center of the body part, and the peripheral wall is divided vertically, Is formed on each of the divided upper and lower peripheral walls.

  In the above configuration, the buckling deformation is further reduced in the outward direction during high-temperature filling (pressurized state) by forming the decompression absorption panel in a state where it is divided into an upper body wall surface and a lower body wall surface. Bulging deformation to such an extent that does not cause stagnation is ensured, and reliable depression deformation is ensured when the temperature is lowered (depressurized state).

Since the present invention has the above-described configuration, the following effects can be obtained.
In the main configuration of the present invention, it is possible to ensure deformation that does not cause buckling deformation to the outside of the reduced pressure absorption panel during high temperature filling (pressurized state), and to reliably prevent inversion of the reduced pressure absorption panel. it can.

  Also, in the configuration where the vertical dimension of the central part of the lateral convex rib is narrower than the vertical dimension of both end parts, a larger vacuum absorption function is exhibited, so that the depression deformation in the reduced pressure state is effectively prevented. Therefore, the external shape of the housing can be returned to the original state before the deformation.

  In addition, in the configuration in which the planar shape of the laterally convex rib is a substantially concave lens shape that is recessed in a concave arc shape in a direction in which the upper and lower sides approach each other, smoother bulging deformation operation and depression deformation operation can be achieved. it can.

  In addition, in the configuration in which a circumferential groove recessed inward is formed in the center of the body part and the peripheral wall is divided into upper and lower parts, and the decompression absorption panel is formed in each of the divided upper and lower peripheral walls, 1 By reducing the area of the reduced pressure absorption panel per case, it is possible to keep the bulging deformation amount and the depression deformation amount in each of the reduced pressure absorption panels low. Thereby, in the process from the pressurization state at the time of high temperature filling to the decompression state at the time of the temperature drop, the bulging and deforming decompression absorption panel can be reliably returned to the original state before the bulging.

It is a front view which shows 1st Example of the square type | mold housing of this invention. 1 shows a reduced pressure absorption panel as a main part in the first embodiment, A is an enlarged front view showing the configuration of the reduced pressure absorption panel, B is a sectional view taken along line b1-b1 of A, and C is a sectional view taken along line c1-c1 of A. FIG. It is a front view which shows 2nd Example of the square type | mold housing of this invention. The pressure reduction absorption panel as a principal part in 2nd Example is shown, A is an enlarged front view which shows the structure of a pressure reduction absorption panel, B is sectional drawing in the b2-b2 line of A, C is a cross section in the c2-c2 line of A. FIG. It is a front view of the square frame shown as a comparative example. The structure of the decompression absorption panel in a comparative example is shown, A is an enlarged front view of a decompression absorption panel, B is sectional drawing in the b3-b3 line and c3-c3 line of A. It is a graph which shows the analysis result of a pressure | voltage resistant measurement as a bottle capacity increase. It is a graph which shows the analysis result of a pressure | voltage resistant measurement as a panel bulge amount. It is a graph which shows the result of a decompression absorption capacity measurement test. 10 is a graph showing FIG. 9 partially enlarged. It is a front view which shows the conventional square housing.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a front view showing a first embodiment of a rectangular housing of the present invention, FIG. 2 shows a reduced pressure absorption panel as a main part in the first embodiment, and A is an enlarged front view showing a configuration of the reduced pressure absorption panel. , B is a sectional view taken along line b1-b1 of A, and C is a sectional view taken along line c1-c1 of A. Although FIG. 2 shows the configuration of the upper vacuum absorption panel 10a, the enlarged front view 10b of the lower vacuum absorption panel has the same configuration.

  As shown in FIG. 1, a rectangular housing 1A shown as the first embodiment is a biaxial stretch blow-molded product made of PET resin. This rectangular housing 1A has a mouth tube portion 2, a shoulder portion 3 having a tapered square tube shape, a body portion 4 having a square tube structure having a square shape with a square cross section, and a bottom portion 8 for 500 ml. belongs to. And the trunk | drum 4 is formed from the four peripheral walls 5 which comprise a front surface, a back surface, a right side surface, and a left side surface, and the four corner walls 6 which connect the adjacent peripheral walls 5 in the shape of a square.

  A circumferential groove 7 that is recessed inwardly of the rectangular housing 1A to increase the surface rigidity and buckling strength of the peripheral wall 5 is formed at a central height position that is approximately ½ of the body portion 4. A reduced pressure absorption panel 10 (10a, 10b) is formed in each portion of the peripheral wall 5 divided into upper and lower portions by the grooves 7.

  As shown in FIG. 2, the reduced pressure absorption panel 10 is formed such that the peripheral wall 5 is formed in a depressed shape, and the width dimension on the center side is slightly wider than the width dimension on the mouth tube part 2 (or bottom part 8) side. The substantially trapezoidal frame portion 11 is formed. A recessed panel bottom 12 is provided inside the frame 11. The panel bottom surface 12 is integrally formed with a plurality of laterally convex ribs 13 that are formed in a convex cross section projecting outward and arranged in parallel with a predetermined interval in the height direction.

  In the rectangular housing 1A shown in the first embodiment, the longitudinal dimension (width dimension in the height direction) w1 of the central portion 13a in the longitudinal direction of the lateral convex rib 13 is the end portions 13b and 13b (hereinafter referred to as both ends) on both sides thereof. The width of the horizontal convex rib 13 is close to the center of the upper and lower sides 13c and 13c. It is a substantially concave lens shape that is recessed in the direction of a concave arc.

  The depth dimension d1 of the panel bottom surface 12 with respect to the peripheral wall 5 is 2.0 mm, whereas the depth dimension d2 of the lateral convex rib 13 with respect to the peripheral wall 5 is 1.5 mm. The substantially protruding dimension (d2-d1) of the lateral convex rib 13 is set to 0.5 mm.

  FIG. 3 is a front view showing a second embodiment of the rectangular housing of the present invention, FIG. 4 shows a reduced pressure absorption panel as a main part in the second embodiment, and A is an enlarged front view showing a configuration of the reduced pressure absorption panel. , B is a sectional view taken along line B2-b2 of A, and C is a sectional view taken along line c2-c2 of A. FIG. 4 shows the configuration of the upper vacuum absorption panel 10a, but the configuration of the enlarged front view 10b of the lower vacuum absorption panel is the same.

  The square housing 1B shown in the second embodiment is different from the square housing 1A of the first embodiment in the configuration of the reduced pressure absorption panel 10, particularly the laterally convex rib 13, and the other configurations are the same as those described above. This is the same as the rectangular housing 1A of the first embodiment. Therefore, below, the structure of the reduced pressure absorption panel 10 which is mainly different parts is demonstrated.

  In the rectangular housing 1B shown in the second embodiment, the longitudinal dimension w1 of the central portion 13a in the longitudinal direction of the laterally convex rib 13 is formed wider than the longitudinal dimension w2 of both end portions 13b (w1>). w2) The planar shape of the laterally convex rib 13 is a substantially convex lens shape in which the opposing distances in the vicinity of the central portions of the upper and lower sides 13c, 13c are projected in a convex arc shape in a direction away from each other.

  The depth dimension d1 of the panel bottom surface 12 with respect to the peripheral wall 5, the depth dimension d2 of the lateral convex rib 13 with respect to the peripheral wall 5, and the substantial projecting dimension (d2-d1) of the lateral convex rib 13 from the panel bottom surface 12 are as described above. The same as in the first embodiment.

  FIG. 5 is a front view of a rectangular housing shown as a comparative example, FIG. 6 shows the configuration of the reduced pressure absorption panel in the comparative example, A is an enlarged front view of the reduced pressure absorption panel, and B is a b3-b3 line and c3- It is sectional drawing in c3 line. FIG. 6 shows the configuration of the upper vacuum absorption panel 10a, but the configuration of the lower vacuum absorption panel 10b is the same as described above.

A square housing 1C shown as a comparative example is also different from the square housings 1A and 1B of the first and second embodiments in the configuration of the laterally convex ribs 13 of the vacuum absorbing panel 10 in particular. That is, the horizontal convex rib 13 of the rectangular housing 1C shown as a comparative example is a so-called straight type in which the opposing distance between the upper and lower sides 13c, 13c is formed with the same vertical dimension w over the entire range of the horizontal convex rib 13. is there.
Other configurations are the same as those in the first and second embodiments.

  Next, in order to confirm the operational effects of the rectangular housing of the present invention, the pressure resistance measurement test for the rectangular housing 1 (1A, 1B and 1C) shown in the first embodiment, the second embodiment and the comparative example, and A vacuum absorption capacity measurement test was conducted and will be described below.

  FIG. 7 is a graph showing the analysis result of the pressure resistance measurement as an increase in the bottle capacity, FIG. 8 is a graph showing the analysis result of the pressure resistance measurement as a panel bulge amount, FIG. 9 is a graph showing the result of the vacuum absorption capacity measurement test, and FIG. It is a graph which expands and shows 9 partially.

7 is a graph in which the horizontal axis is the internal pressure (kg / cm ² ) and the vertical axis is the bottle capacity increase (ml), and FIG. 8 is a graph in which the horizontal axis is the internal pressure (kg / cm ² ) and the vertical axis. Is graphed with the panel bulge amount (mm). 9 and 10 are graphs with the abscissa indicating the reduced pressure strength (kPa) and the ordinate indicating the absorption capacity (ml).

  7 to 10, the result for the rectangular housing 1A of the first embodiment is T1 (solid line), the result for the rectangular housing 1B of the second embodiment is T2 (dashed line), and a comparative example. The results for the square housing 1C are indicated by C (broken line).

(1) Pressure resistance measurement The analysis result of the pressure resistance measurement assumed a bulging deformation of the decompression absorption panel in the outward direction of the rectangular housing 1 when the inside of the rectangular housing 1 is in a pressurized state due to high temperature filling. It shows as a simulation result in the case.

First embodiment, each of the square bottle body 1 in the second embodiment and the comparative example, bulge bottle volume increase (ml) and the panel in the case of internal pressure 0.05 kg / cm ² and an internal pressure 0.2 kg / cm ² The results of the quantity (mm) are shown in Table 1.

From the results of FIGS. 7 and 8 and Table 1, when the internal pressure is 0.05 kg / cm ² , the bottle capacity increase amount and the panel bulge amount are shown as a comparative example (C) provided with the straight-type laterally convex ribs 13. It can be seen that the rectangular housing 1C is the smallest, the next smallest is the rectangular housing 1A of the first embodiment (T1), and the rectangular housing 1B of the second embodiment (T2) is the largest. In the case of an internal pressure of 0.2 kg / cm ² , the amount of increase in the bottle capacity and the amount of panel swelling of the rectangular housing 1A of the first embodiment (T1) and the rectangular housing 1B of the second embodiment (T2) are as follows. It can be seen that this is almost the same as the rectangular housing 1C of the comparative example (C).

However, as shown in FIGS. 7 and 8, when the internal pressure of each rectangular housing 1 is gradually increased, when the internal pressure exceeds approximately 0.05 kg / cm ² , the comparative example (C) In the case of the square housing 1C, it was confirmed that the vacuum absorbing panel 10 was inverted. The state in which the vacuum absorbing panel 10 is inverted is shown as an S-curve on the graphs of FIGS. 7 and 8, and the position C1 (see FIG. 8) on the graph where the S-curve is first formed is This is the inflection point C1 at which the vacuum absorbing panel 10 starts to reverse.

  As in the square housing 1C of the comparative example (C), if the reduced pressure absorption panel 10 is reversed once while the internal pressure is increased, the reversed state is maintained even if the pressure is reduced thereafter. As a result, the appearance (designability) of 1 is impaired.

On the other hand, in the rectangular housings 1A and 1B of the first embodiment (T1) and the second embodiment (T2), the vacuum capacity absorption panel 10 does not reverse, and the bottle capacity increases almost in proportion to the increase of the internal pressure. There was a trend.
As a result, the square housing 1A of the first embodiment (T1) and the square housing 1B of the second embodiment (T2) are more resistant to pressure than the square housing 1C of the comparative example (C). It was confirmed that it was excellent.

(2) Vacuum absorption capacity measurement test The vacuum absorption capacity measurement test is performed when the rectangular housing 1 in a pressurized state due to high-temperature filling is reduced in pressure as the temperature of the content liquid thereafter decreases. This assumes that the decompression panel 10 is depressed in the square housing 1 inward.

  Fill the square casing 1 to be filled with water, and attach a rubber stopper burette to the mouth tube, operate the vacuum pump, and depressurize with a manometer at a speed of 0.4 kPa / sec. Read the value of the burette when the casing 1 is deformed illegally such as local depression deformation or buckling deformation, and calculate the reduced pressure absorption capacity from the value of the burette before and after the test.

  As shown in FIGS. 9 and 10, it is the rectangular housing 1A of the first embodiment (T1) that has the largest absorption capacity over almost the entire range, and the rectangular housing 1B of the second embodiment (T2). It can be seen that the absorption capacity of the rectangular housing 1C of the comparative example (C) is substantially the same.

From the results of the pressure resistance measurement test and the vacuum absorption capacity measurement test described above, the square housing 1A shown in the first example (T1) as a whole has excellent pressure resistance characteristics and vacuum absorption characteristics. It was confirmed that this was a housing that was not easily deformed and easily deformed in a reduced pressure state.
As a result, the prismatic casing 1A shown in the first embodiment (T1) having the reduced pressure absorption panel 10 made of the substantially convex lens-shaped lateral convex ribs 13 is a series of high temperature filling and lowering of the temperature of the content liquid after filling. In the process of changing the internal pressure, it can be said that it is the most excellent case for maintaining the design of the appearance of the square case.

  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 said Example, the structure of the square-shaped housing | casing 1 which has arrange | positioned the decompression absorption panels 10a and 10b in each of the up-and-down peripheral wall 5 which formed and divided the peripheral groove 7 in the approximate center of the height direction of the peripheral wall 5. However, the present invention is not limited to this, and a reduced-pressure absorption panel having a large area is formed on the peripheral wall 5 that does not have the peripheral groove 7 and is not divided into upper and lower parts, and the inside of the reduced-pressure absorption panel. It is also possible to make the rectangular housing 1 composed of the above-described lateral convex ribs 13 formed thereon.

  In the configuration in which the vacuum absorbing panels 10a and 10b are separated from the upper and lower peripheral walls 5, the deformation operation of the upper and lower vacuum absorbing panels can be made independent, so that the buckling deformation to the outside during high temperature filling (pressurized state) is prevented. By achieving bulging deformation to such an extent that it does not occur, and by achieving reliable depression deformation when the temperature drops (depressurized state), the bulging-deformed vacuum absorbing panel is reliably returned to its original state before bulging deformation. be able to.

  On the other hand, the reduced-pressure absorption panel having a large area on the peripheral wall 5 can have a larger pressure resistance characteristic and reduced-pressure absorption characteristic than the divided configuration, and can be deformed.

  In each of the above-described embodiments, the rectangular casing 1 has been described as a casing having the square-tube-shaped body 4. However, the present invention is not limited to this, and the rectangular-tube-shaped body. 4 may be a square housing.

  The synthetic resin prismatic casing of the present invention is a swell generated when the body is thinned and the body is turned from high temperature filling (pressurized state) to low temperature (depressurized state). This solves the problem that the deformation is maintained, and can be used in a wider area in the container field in consideration of resource saving, cost reduction, and the like.

1, 1A, 1B, 1C; Square housing 2; Mouth tube portion 3; Shoulder portion 4; Body portion 5; Peripheral wall 6; Corner wall 7; Peripheral groove 8; Bottom portion 10; A bottom surface 13; a laterally convex rib 13 a; a central portion 13 b of the laterally convex rib; an end portion 13 c of the laterally convex rib; both upper and lower sides of the laterally convex rib

Claims (4)

The body part (4) of a rectangular tube shape having four flat peripheral walls (5) and four corner walls (6) connecting the peripheral walls (5) in a square shape. In the synthetic resin square-shaped housing (1) provided with the vacuum absorption panel (10) formed in a depressed shape on the peripheral wall (5),
A plurality of laterally convex ribs (13) having a convex cross section formed with a certain interval in the vertical direction are arranged on the panel bottom surface (12) of the vacuum absorbing panel (10). 13) The horizontal convex rib ( 13) having a vertical dimension of the central portion (13a) and a vertical dimension of both end portions (13b) thereof, which are different from each other and including the central portion (13a) and the both end portions (13b). 13) A synthetic resin square casing characterized in that the whole of 13) is formed with a constant protruding dimension .

  The square-shaped casing made of synthetic resin according to claim 1, wherein the longitudinal dimension (w1) of the central portion (13a) of the laterally convex rib (13) is narrower than the longitudinal dimension (w2) of both end portions (13b).   The synthetic resin square housing according to claim 2, wherein the planar shape of the laterally convex rib (13) is a substantially concave lens shape in which both upper and lower sides are recessed in a concave arc shape in a direction approaching each other.   A circumferential groove (7) recessed inward is formed in the center of the body (4), the peripheral wall (5) is divided into upper and lower parts, and the vacuum absorbing panel (10) is divided into upper and lower peripheral walls (5). The square-shaped casing made of synthetic resin according to any one of claims 1 to 3, which is formed on each of the above.

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