JP2006016076A - Synthetic-resin-made blow-molded bottle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reasonably and effectively thin a bottle by applying reduced pressure absorbability to a barrel equipped with reinforcing ribs in a structure that a plurality of peripheral groove-like reinforcing ribs are provided at approximately equal intervals on the barrel. <P>SOLUTION: The plurality of reinforcing ribs 4 are provided side by side on the barrel 3, and a plane cross section of a bottom wall 6 of the ribs 4 is made into an approximate regular polygon. The approximate regular polygon is constituted of vertexes 7 with a vertex radius of curvature R2 smaller than a barrel radius of curvature R1 which is the radius of curvature of a cylindrical wall of the barrel 3 and sides 8 with a side radius of curvature R3 larger than the barrel radius of curvature R1. Thus portions of the reinforcing ribs 4 where the vertexes 7 are positioned are made easy to flex and deform, so that reduced pressure absorption and deformation is possible. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a synthetic resin blow-molded bottle in which a plurality of circumferential ribs for reinforcement are arranged in parallel at substantially equal intervals on a bottomed cylindrical body.

In a blow molding bottle made of a synthetic resin having a cylindrical body portion, particularly a biaxial stretch blow molding bottle that is required to be thin, it has a plurality of circumferential groove shapes in order to keep the body portion strong. There is known a structure in which the reinforcing ribs are arranged in parallel at substantially equal intervals.
Japanese Patent Laid-Open No. 11-035027

  In the prior art disclosed in this Patent Document 1, the body of the bottle is divided into an upper part, an intermediate part and a lower part, the upper part is configured as a shoulder part, the intermediate part is configured as a gripping part, and The lower part is configured as a reduced pressure absorption part, and a plurality of concave ribs, which are reinforcing ribs having a circumferential groove shape, are arranged in parallel at substantially equal intervals in an intermediate part constituting the grip part.

  The plurality of concave ribs provided in the intermediate portion are formed at an equal depth, and support the acting grip force evenly, thereby causing the intermediate portion to exhibit practically sufficient strength.

  However, in the prior art disclosed in Patent Document 1, it is required that there is a dimensional margin for dividing the body portion into an intermediate portion that forms the grip portion and a lower portion that forms the reduced pressure absorption portion. , When there is no dimensional allowance in the body part to separate the grip part and the vacuum absorption part, or when it is difficult to maintain the required strength in the vacuum absorption part because the thinning of the body part is promoted Therefore, it is required to provide concave ribs in the whole area of the middle part and the lower part of the body part to maintain the required strength.

  In this case, by providing the concave ribs, the strength of the body part can surely be required, but since the required vacuum absorption capacity cannot be obtained, the reduced pressure that can withstand the reduced pressure generated. There is a problem that it is necessary to stop to such an extent that the strength can be obtained, and thus it is not possible to obtain a sufficiently thin bottle.

  Therefore, the present invention was devised to solve the above-described problems in the prior art, and a plurality of circumferential rib-shaped reinforcing ribs are provided over the entire height range of the bottomed cylindrical body. In a configuration provided at approximately equal intervals, it is a technical object to provide a vacuum absorption capacity to the body portion provided with the reinforcing rib, and thus it is intended to effectively reduce the thickness of the bottle effectively. .

Among the present invention for solving the above technical problem, the means according to claim 1 is:
A plurality of circumferential groove-shaped reinforcing ribs are arranged in parallel at substantially equal intervals on the bottomed cylindrical body,
The plane cross-sectional shape of the bottom wall of this reinforcing rib is a substantially regular polygon,
This substantially regular polygon was composed of a top portion having a top curvature radius smaller than the curvature radius of the trunk portion, which is the curvature radius of the cylindrical wall of the trunk portion, and a side portion having a side curvature radius larger than the trunk curvature radius. ,
It is in.

  In the first aspect of the present invention, the trunk portion has a plurality of reinforcing ribs that effectively exerts a reinforcing action against an external force such as a gripping force, thereby providing a practically required strength. Demonstrate enough.

  Since the flat cross-sectional shape of the bottom wall of the reinforcing rib is a substantially regular polygon, the groove depth of the reinforcing rib is shallow in the top portion where the top of the bottom wall is located, and the side where the side of the bottom wall is located Therefore, the reinforcing rib does not exhibit a uniform reinforcing force over the entire circumference, and the top portion of the trunk portion is more easily bent and deformed than the side portion of the reinforcing rib. It has become a thing.

  Therefore, when decompression occurs in the bottle, the stress associated with the decompression is basically concentrated on the top portion of the reinforcing rib, and this causes the small volume portion where the top portion is located to project outward. As a result, the large-volume portion in which the side portion is located is displaced inwardly and exhibits a reduced pressure absorption action.

  The invention described in claim 2 is obtained by adding the configuration of the invention described in claim 1 to the fact that the plane cross-sectional shape of the bottom wall of the reinforcing rib is a substantially equilateral triangle.

  In the invention according to claim 2, since the flat cross-sectional shape of the bottom wall of the reinforcing rib is a triangle, the reinforcing rib is not crushed and deformed as long as the strength of the side portion of the reinforcing rib is ensured. Since the length of the portion can be maximized, the degree of volumetric deformation can be increased accordingly, thereby increasing the amount of vacuum absorption.

  The invention according to claim 3 is obtained by adding at least the top of the bottom wall of the adjacent reinforcing rib to the configuration of the invention according to claim 1 or 2 while being shifted in the circumferential direction.

  In the invention according to claim 3, since the adjacent reinforcing ribs are located opposite to each other in the vertical direction, the side portions that are depressed and deformed are opposed to the top portions that are projecting and deformed during decompression absorption deformation. Due to the deformation of the opposing top part and side part, the body wall part between the reinforcing ribs receives a rotational moment from the top part and the side part, and the top part side is on the outside and the side part side is on the inside. Try to transform.

  Due to the deformation of the body wall portion between the reinforcing ribs, the above-described deformation of the top portion and the side portion of each reinforcing rib can be smoothly achieved, thereby easily shrinking in the radial direction and the vertical direction, resulting in a large absorption capacity. Become.

  According to a fourth aspect of the present invention, in the configuration of the third aspect of the invention, the top part of one bottom wall of the adjacent reinforcing rib and the central part of the side part of the other bottom wall are vertically opposed to each other. That is,

  In the invention according to claim 4, since the top portion of one reinforcing rib faces the central portion of the side portion of the other reinforcing rib, it is transmitted from the top portion facing vertically to the side portion. The force acting on the side portion is not biased to the left and right, so that the deformation of the top portion and the side portion does not include the twisted state, and accordingly, the absorption capacity and the reduced pressure strength are increased.

  The invention according to claim 5 adds to the configuration of the invention according to claim 1 or 2 that the top of the bottom wall of each of the three or more odd number of reinforcing ribs is located at the same position along the circumferential direction. Is

  In the invention according to claim 5, due to the deformation of the reinforcing ribs located at the upper and lower ends, the reinforcing rib located at the center is deformed in the opposite direction, that is, the top part is depressed and the side part protrudes. Since the deformed side portion of the reinforcing rib located in the center functions as a column, the vertical contraction of the body portion is suppressed, thereby increasing the rigidity and increasing the decompression strength.

  The invention according to claim 6 is provided with a concave rib that forms a small groove over the entire circumference of the bottom wall of the reinforcing rib in the configuration of the invention according to claim 1, 2, 3, 4 or 5. , Is added.

  In the invention according to claim 6, by providing the concave rib on the bottom wall of the reinforcing rib, the reinforcing function of the entire reinforcing rib is structurally enhanced, thereby increasing the decompression strength of the trunk portion. Accordingly, the amount of vacuum absorption increases accordingly.

  The invention according to claim 7 is the configuration of the invention according to claim 1, 2, 3, 4 or 5, wherein a concave rib for forming a small groove is provided on each side of the bottom wall of the reinforcing rib. Is added.

  In the invention according to claim 7, since the concave rib is provided only on the side portion of the bottom wall of the reinforcing rib and the concave rib is not provided on the top portion of the bottom wall, only the side portion of the reinforcing rib is reinforced. In this state, the function is structurally enhanced, and thus the larger deformation of the top portion is stably held in a state where the ease of bending deformation of the top portion is maintained.

Since the present invention has the above-described configuration, the following effects can be obtained.
In the invention according to claim 1, by providing a plurality of reinforcing ribs on the cylindrical barrel portion of the bottle, practically sufficient strength can be given to the barrel portion. By providing a portion with a large reinforcement strength and a portion with a small reinforcement strength, a portion where stress accompanying decompression is concentrated is intentionally formed, and thereby, the decompression absorption capacity can be effectively exerted without difficulty.

  In the invention according to the second aspect, it is possible to stably and safely absorb and deform the body part under reduced pressure without causing crushing deformation.

  In the invention of claim 3, the deformation of the top wall portion and the side wall portion of each reinforcing rib is smoothly achieved by the deformation of the body wall portion between the reinforcing ribs. It is easy to shrink and a large absorption capacity can be obtained.

  In the invention according to claim 4, the deformation of the top portion and the side portion of the reinforcing rib is easy to be performed and does not include a twisted state. The absorption capacity increases as the reduced pressure strength increases.

  In the invention of claim 5, due to the deformation in the reverse direction of the reinforcing rib located at the center, the vertical contraction of the trunk portion is suppressed, thereby increasing the rigidity and increasing the decompression strength, Minutes, the absorption capacity increases.

  In the invention according to the sixth aspect, since the reinforcing function of the reinforcing rib is enhanced, the amount of vacuum absorption is increased correspondingly, and further thinning is possible.

  In the invention according to claim 7, since only the reinforcing function of the side portion of the reinforcing rib is enhanced, the larger deformation of the top portion is maintained while maintaining the ease of bending deformation of the top portion of the reinforcing rib. Is held stably, and it exhibits a higher vacuum absorption capacity and higher vacuum strength.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows an overall front view of a first embodiment of a bottle according to the present invention, wherein a screw thread is formed on the outer peripheral surface of the upper end via a shoulder 2 having a truncated conical shape reduced in diameter upward. A cylindrical body portion 3 having a bottomed cylindrical shape in which an engraved cylindrical mouth tube portion 1 is erected continuously, and five circumferential groove-shaped reinforcing ribs 4 are arranged in parallel at substantially equal intervals.

  Each reinforcing rib 4 is composed of a pair of side walls 5 and a bottom wall 6 connecting the lower ends of the pair of side walls 5, and the bottom wall 6 has a flat cross-sectional shape as shown in FIG. , Three apexes 7 curved with a top radius of curvature R2 which is a radius of curvature smaller than a radius of curvature R1 which is a radius of curvature of the cylindrical wall of the barrel 3, and a side which is a radius of curvature larger than the radius of curvature R1 Since the side wall 5 has a constant degree of curvature and inclination, the groove of the opening of each reinforcing rib 4 is composed of three side parts 8 curved with a radius of curvature R3. The width is large at the side portion where the side portion 8 of the bottom wall 6 is located, and is small at the top portion where the top portion 7 is located (see FIG. 1).

  Reinforcing ribs 4 arranged adjacent to each other in the order of A, B, C, D, and E from the top are reversed at the B position with respect to those at the A position, as shown in the mutual orientation explanatory diagram of FIG. The C position is displaced 90 ° counterclockwise relative to the B position, the D position is reversed relative to the C position, and the E position The thing has the same posture as that of the A position.

  That is, the reinforcing ribs 4 adjacent to each other in the vertical direction are not necessarily aligned in the vertical direction, but are always shifted in the circumferential direction. Are opposed to each other from above and below, and the force acting between them is applied in the direction in which the respective deformations are promoted, so that the reduced pressure absorption deformation as a whole can be performed without difficulty.

  As a first embodiment of the bottle according to the present invention, as shown in FIG. 3, a first structural example in which the position of the top portion of each reinforcing rib 4 is shifted in the circumferential direction, and the top portion and sides of each reinforcing rib 4 are used. A second structural example in which the central portion of the part portion is vertically opposed to each other and a third structural example in which the positions of the top portions of the reinforcing ribs 4 are vertically matched can be considered.

  In the first structure example and the second structure example, as shown in FIG. 4, the wall portion of the body portion 3 between the reinforcing ribs 4 is exposed to the outside by the rotational moment from the top portion, and the side portion portion. Since it tends to be deformed inward by the rotational moment from the top, it will cause the protrusion deformation of the top portion and the depression deformation of the side portion to be caused smoothly.

  Comparing the volume reduction variations of the first structure example and the second structure example, the case of the first structure example shown in FIG. 6A and the case of the second structure example shown in FIG. As is clear from the above, in the case of the second structural example, the top 7 portion of the reinforcing rib 4 is opposed to the central portion of the side portion 8 of the adjacent reinforcing rib 4, whereas in the first structural example, In this case, the top portion does not necessarily face the central portion of the side portion of the adjacent reinforcing rib 4.

  For this reason, in the second structural example, the stress acting on the side portion from the top portion acts on the side portion without deviation, and does not cause unnecessary twisting, whereas in the first structural example, Since the top part is opposed to the side part with a deviation from the central part, the stress acting on the side part from the top part acts biased along the length direction of the side part. As a result, unnecessary twisting occurs, and the decompression strength slightly decreases accordingly.

  In the third structure example, as shown in FIG. 5, the top portion of the reinforcing rib 4 at the B position and the D position has a deforming force toward the outside, and the wall of the trunk portion 3 on the A position side and the E position side. In the apex portion at the center C position, the outward force due to the decompression loses the inward force from the top and bottom and deforms inwardly at the top portion at the center C position.

  That is, as shown in FIG. 6C, the reinforcing ribs 4 at the A position and the E position are greatly deformed according to the flat cross-sectional shape, and the reinforcing ribs 4 at the B position and the D position are deformed according to the flat cross-sectional shape. However, the deformation amount is small, and the reinforcing rib 4 at the C position is largely deformed against the flat cross-sectional shape.

  In the case of this third structure example, the side portion of the reinforcing rib 4 at the C position protrudes and deforms in an inverted manner, so that the side portion that is protruded and deformed constitutes a column function portion, thereby extending along the vertical direction. Strongly suppresses shrinkage deformation.

  As described above, the bottle of the first structure example exhibits a reduced pressure strength that does not cause inconvenience in practice and also exhibits a sufficient reduced pressure absorption capacity. The second structure example is compared with the first structure example. Both the reduced pressure intensity and the reduced pressure absorption capacity are slightly increased. In the third structure example, the reduced pressure absorption capacity is smaller than that of the first and second structure examples, but the reduced pressure intensity is increased.

  Further, due to the difference in structure in each of the above structural examples, in the first structural example, since the top portion and the side portion are dispersed, the protruding and depressed deformation portions are dispersed. This is suitable for products whose appearance is important, and the second structure example shows a certain amount of reduced pressure absorption deformation as an appearance, but has a sufficient reduced pressure absorption capacity and a relatively large reduced pressure. Due to its strength, it is suitable for use as a general decompression-resistant container, and the third structural example is used in an environment where a strong external force acts, for example, handled by a vending machine due to its strong decompression strength. Suitable for bottles.

  FIG. 7 is an overall front view of the second embodiment of the bottle according to the present invention, except that the plane cross-sectional shape of the bottom wall 6 of the reinforcing rib 4 is substantially square as shown in FIG. The rest is the same as in the first embodiment.

  The five reinforcing ribs 4 that are adjacently arranged in the order of A, B, C, D, and E from the top have the lower reinforcing ribs 4 with respect to the upper reinforcing ribs 4 as shown in the mutual orientation explanatory diagram of FIG. The top portions of the reinforcing ribs 4 are opposed to the central portions of the side portions of the adjacent reinforcing ribs 4 by being rotated and displaced sequentially by 45 ° in the clockwise direction.

  FIG. 10 shows an overall front view of the third embodiment of the bottle according to the present invention. As shown in FIG. 11, the plane cross-sectional shape of the bottom wall 6 of the reinforcing rib 4 is a substantially regular pentagon. Except for this point, the rest is the same as the first and second embodiments.

  The five reinforcing ribs 4 arranged adjacent to each other in the order of A, B, C, D, E from the top are lower reinforcing ribs with respect to the upper reinforcing rib 4 as shown in the mutual orientation explanatory diagram of FIG. 4 are positioned so as to be rotated and displaced in order by 36 ° in the clockwise direction, whereby the top portion of the reinforcing rib 4 faces the central portion of the side portion of the adjacent reinforcing rib 4.

  Comparing the first to third embodiments, the magnitude of the reduced pressure absorption capacity is the order of the first, second, and third embodiments, and the magnitude of the reduced pressure intensity is the third, second, and second. This is the order of one embodiment.

  As described above, the difference in the reduced-pressure absorption capacity and the reduced-pressure strength between the first, second, and third embodiments is due to the overall deformation due to the difference in the number of angles of the flat cross-sectional shape of the bottom wall 6. This seems to be due to the difference in ease of handling.

  FIG. 13: shows the whole front view of 4th embodiment of the bottle by this invention, and covers the bottom wall 6 of each reinforcement rib 4 in 1st embodiment over the perimeter of the bottom wall 6 (FIG. 14), a concave rib 9 (see FIG. 15) for forming a small circumferential groove having an equal depth is additionally formed.

  In the fourth embodiment, by providing the concave rib 9, the reinforcing strength of the entire reinforcing rib 4 is increased, and thereby the reduced pressure strength is greatly increased. However, the increased reinforcing strength makes it difficult to deform. Therefore, the increase rate of the vacuum absorption amount with respect to the increase rate of the reduced pressure strength is small.

  FIG. 16 shows an overall front view of the fifth embodiment of the bottle according to the present invention. Only the side 8 of the bottom wall 6 of each reinforcing rib 4 in the first embodiment (see FIG. 17) A concave rib 9 for forming a small groove is additionally formed.

  In the fifth embodiment, by providing the concave rib 9 only on the side portion 8 of the bottom wall 6, the reinforcing strength of the side portion of the reinforcing rib 4 is changed without changing the reinforcing strength of the top portion of the reinforcing rib 4. Therefore, it is easy to concentrate the reduced pressure absorption deformation at the position where the top portion of the reinforcing rib 4 is located. This can cause the reduced pressure absorption deformation smoothly and obtain a stable reduced pressure absorption deformation mode. .

1 is an overall front view showing a first embodiment of the present invention. FIG. 2 is a cross-sectional plan view taken along the line AA in FIG. It is explanatory drawing which shows the mutual positional relationship of each reinforcement rib of 1st embodiment shown in FIG. It is operation | movement explanatory drawing which shows the deformation | transformation state of the reinforcement rib of the 1st and 2 structure examples of 1st embodiment. It is operation | movement explanatory drawing which shows the deformation | transformation state of the reinforcement rib of the 3rd structural example of 1st embodiment. It is operation | movement comparison explanatory drawing which shows distribution of the deformation force of each structural example of 1st embodiment. It is a whole front view which shows 2nd embodiment of this invention. FIG. 8 is a cross-sectional plan view taken along the line AA in FIG. It is explanatory drawing which shows the mutual positional relationship of each reinforcement rib of 2nd embodiment shown in FIG. It is a whole front view which shows 3rd embodiment of this invention. It is the plane sectional view which looked at the cutting arrow along the AA line in FIG. It is explanatory drawing which shows the mutual positional relationship of each reinforcement rib of 3rd embodiment shown in FIG. It is a whole front view which shows 4th embodiment of this invention. FIG. 14 is a cross-sectional plan view taken along the line AA in FIG. It is a principal part expanded longitudinal cross-section which shows the concave rib in 4th embodiment shown in FIG. It is a whole front view which shows 5th embodiment of this invention. FIG. 17 is a cross-sectional plan view taken along the line AA in FIG.

Explanation of symbols

1; Mouth part 2; Shoulder 3; Body 4; Reinforcement rib 5; Side wall 6; Bottom wall 7; Top 8; Side 9; Concave rib R1; Body radius of curvature R2: Top curvature radius R3; curvature radius

Claims (7)

  A plurality of circumferential groove-shaped reinforcing ribs (4) are juxtaposed at substantially equal intervals on the bottomed cylindrical body (3), and the flat cross-sectional shape of the bottom wall (6) of the reinforcing rib (4) is formed. A substantially regular polygon, and the substantially regular polygon is a top portion (7) having a top curvature radius (R2) smaller than a curvature radius (R1) which is a curvature radius of the cylindrical wall of the trunk portion (3); A synthetic resin blow-molded bottle composed of a side part (8) having a side part curvature radius (R3) larger than the trunk part curvature radius (R1).   The synthetic resin blow-molded bottle according to claim 1, wherein a flat cross-sectional shape of the bottom wall (6) of the reinforcing rib (4) is a substantially equilateral triangle.   The synthetic resin blow-molded bottle according to claim 1 or 2, wherein at least the top (7) of the bottom wall (6) of the adjacent reinforcing rib (4) is shifted in the circumferential direction.   The top part (7) of one bottom wall (6) of the adjacent reinforcing rib (4) and the central part of the side part (8) of the other bottom wall (6) are positioned so as to face each other vertically. 3. A blow molded bottle made of synthetic resin according to 3.   The synthetic resin blow-molded bottle according to claim 1 or 2, wherein the top (7) of the bottom wall (6) of each of the three or more odd-numbered reinforcing ribs (4) has the same position along the circumferential direction.   The synthetic resin blow molding according to claim 1, 2, 3, 4, or 5, wherein a concave rib (9) for forming a small concave groove is provided over the entire circumference of the bottom wall (6) of the reinforcing rib (4). Bottle.   The synthetic resin product according to claim 1, 2, 3, 4 or 5, wherein each side portion (8) of the bottom wall (6) of the reinforcing rib (4) is provided with a concave rib (9) for forming a small concave groove. Blow molded bottle.

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