JP2006321568A - Synthetic resin-made bottle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a synthetic resin-made bottle which is easy to be carried because a gripping recess is deep and excellent in dropping strength, improved in pressurization-proofness and depression resistance and capable of preventing a buckling phenomenon or the like, while securing moldability and light-weight performance. <P>SOLUTION: The synthetic resin-made bottle is constituted such that the shortest distance L between the deepest sections of the gripping recesses formed at both the sides of the barrel of the body of the synthetic resin-made bottle is 50% or less of the diameter D of the barrel (L/D≤50%), and the diameter cross-sectional configuration of the gripping recess is bilaterally symmetry to a straight line for connecting the deepest section with the axial center in the barrel, and furthermore, it has a reinforcing bead which has axially prepared three beads extending in a radial direction in a convex shape in the outward direction at predetermined intervals in the gripping recess, the angle θ1 of a diameter cross section in the gripping recess is within a range of 0 or 90 degrees (0 degree≤θ1≤90 degrees) and the angle θ2 formed by the line for connecting both the deepest sections in the diameter cross section in the gripping recess with the axial center in the barrel is within a range of 120 to 180 degrees (120 degrees≤θ2≤180 degrees). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a synthetic resin bottle having a holding recess in the bottle body, more specifically,
This invention relates to a synthetic resin bottle that is easy to carry even if it is a relatively large and heavy synthetic resin bottle, such as 1.8 to 4 liters, by making the shape of the holding recesses specific. .

Conventionally, for example, synthetic resin bottles that contain relatively large volumes of soy sauce, cooking oil, shochu, whiskey, etc., such as 1.8 to 4 liters, have a separate handle for easy carrying. The one that has been molded is known.
This synthetic resin bottle is handheld with a grip recess without using separate parts because of cost reduction, resource saving, and environmental protection requirements. As a result, various measures to avoid strength reduction are available. It has been subjected. However, such a synthetic resin bottle has a buckling phenomenon (a phenomenon in which a holding recess protrudes outward) due to an impact when dropped in a content-filled product and a pressure during a pinhole check during bottle manufacture. Therefore, the grip recess cannot be formed so deeply that it is easier to hold than without it, but it requires a corresponding gripping force, and it is not necessarily satisfactory in terms of ease of holding and ease of pouring. Absent.

From such a situation, as a prior art, for example, as shown in FIGS. 12 and 13, both side portions of the body b of the synthetic resin bottle a are recessed inward to form a vertically long holding recess c. A plurality of reinforcing ribs d are provided in the holding recesses c, and the reinforcing ribs d are formed so that the protruding tops e traverse the holding recesses c, and the body b on the side to be held between the holding recesses c. A plurality of reinforcing ribs f are provided to prevent the buckling phenomenon.

In addition, the following patent documents exist as prior art in the technical field.
Japanese Utility Model Publication No. 4-20727 JP-A-6-56138 Japanese Patent Laid-Open No. 10-139028

The bottle (FIG. 14) shown in Patent Document 1 forms a gripping portion g by providing gripping recesses c on the side surfaces of the body portion b of the synthetic resin bottle a1 to form a back portion of the gripping portion g. The center line T
A plurality of concave reinforcing ribs h orthogonal to each other are formed, and a concave portion i is further formed in the central portion of each concave reinforcing rib h.

Moreover, the bottle (FIG. 15) shown by patent document 2 is the trunk | drum b of the synthetic resin bottle a2.
A pair of gripping recesses c are formed by being recessed from both sides of the lens, and circumferential reinforcing ribs j are formed from the lower portions of these gripping recesses c.

Furthermore, the bottle (FIG. 16) shown in Patent Document 3 has a body portion b of a synthetic resin bottle a3 recessed inward from both sides to form a pair of gripping recesses c facing each other. A plurality of lateral ribs k are formed on the rear barrel wall between the pair of gripping recesses c, and the gripping recess c includes a loose rear slope l continuing from the end of the lateral rib k and a front barrel wall m. A structure is disclosed in which it is recessed inward by a steeply inclined front inclined surface n up to or by a large curved surface continuing from the end of the lateral rib k to the front trunk wall m.

  In the synthetic resin bottle a of FIGS. 12 and 13, the buckling strength is increased by the reinforcing rib d formed in the holding recess c, and the effect of making it difficult for the buckling phenomenon to occur is obtained, but the reinforcing rib d It is not possible to make the holding recess c deep enough to make it easy to hold, and the depth is also reduced by the reinforcing rib d, so that the result is not so easy to hold. In addition, this synthetic resin bottle a is not easily symmetrical with respect to a straight line passing through the center of the bottle axis, and therefore, uneven thickness (overstretching and whitening) easily occurs during molding. There is also a problem.

The synthetic resin bottle a1 of FIG. 14 (Patent Document 1) has an effect that it is difficult to be deformed and easily held when gripping the concave portion c, but the buckling phenomenon considered to be an opposite phenomenon. 12 and 13, as shown in FIGS. 12 and 13, since the radial cross-sectional shape of the gripping recess c is not symmetrical with respect to the straight line passing through the center of the bottle axis, it is easy to cause uneven thickness during molding. Including the problems that originated.

Further, in the synthetic resin bottle a2 of FIG. 15 (Patent Document 2), the angle of the radial cross section of the gripping recess c exceeds 90 degrees, and it is difficult for a finger to be applied, and the gripping recess c has only one or two fingers on one side. Since it does not enter and requires a considerable gripping force, it is not practical for a bottle having a large internal volume such as 2.7 liters.

Furthermore, the synthetic resin bottle a3 of FIG. 16 (Patent Document 3) can be held by the entire palm by placing fingers and is excellent in operability, and even if the gripping recess c is strongly gripped, it is difficult to be deformed and easily held. Although there is a feature of the point, it does not work effectively against the buckling phenomenon which is the reverse phenomenon, and is difficult to hold because the depth of the gripping recess c is not sufficient. As in FIGS. Is not symmetrical with respect to the straight line passing through the center of the bottle axis, there is a problem that uneven thickness tends to occur when the synthetic resin bottle a3 is molded.

Therefore, the object of the present invention is to ensure that the gripping recess has a specific shape so that a sufficient gripping function can be maintained even when a bottle with a large internal volume is fully filled while ensuring moldability and light weight. Another object of the present invention is to provide a synthetic resin bottle that is easy to hold, has excellent drop strength, and can prevent a buckling phenomenon.

The present invention has been proposed in order to achieve the above object, and is characterized by having the following configuration.
That is, according to the present invention, in the synthetic resin bottle provided with the holding recesses on both sides of the body portion of the bottle body composed of the mouth portion, the body portion, and the bottom portion,
The shortest distance (L) between the deepest portions of the holding recesses on both sides is 5 of the diameter (D) of the body portion.
0% or less (L / D ≦ 50%), and the radial cross-sectional shape of the gripping concave portion is bilaterally symmetrical with respect to a straight line connecting the deepest portion and the axial center of the trunk portion, and The recess has a reinforcing bead having three outwardly convex and radially extending beads arranged at predetermined intervals in the bottle axis direction, and the angle (θ1) of the radial section of the gripping recess is 0 to 90 degrees. And an angle (θ2) formed by a line connecting both deepest portions in the radial cross section of the gripping recess and the axial center of the body portion is 120 to 180 ° (0 ° ≦ θ1 ≦ 90 °) range(
There is provided a synthetic resin bottle characterized in that the angle is 120 degrees ≦ θ 2 ≦ 180 degrees.

According to the present invention, the reinforcing bead in the holding recess has a top surface height from the bottom of the depressed portion of 3 mm to 6 mm, and the pitch is provided at intervals of 20 mm to 25 mm. Made bottles are provided.
The present invention is characterized by the fact that when the fingers are put into the gripping recesses by the three reinforcing beads of the gripping recesses, all the fingers fit well and even a large and heavy bottle can be stably carried. There is.

According to the present invention, since the deepest part of the gripping recess is sufficiently deep, it is easy to hold, and since the radial cross-sectional shape of the gripping recess is bilaterally symmetrical, uneven thickness does not easily occur during molding, and a pinhole check, etc. The deformation at the time of depressurization such as holding or holding is difficult. Therefore, while ensuring the moldability and light weight, it is easy to hold the recess for gripping sufficiently deeply, and also has the effect of being excellent in drop strength and pressure-resistant pressure reduction and preventing buckling phenomenon etc. .
In addition, since the angle (θ1) is in the range of 0 ° to 90 ° and the angle (θ2) is set in the range of 120 ° to 180 °, the bottle torso can be gripped safely with fingers and palm. In this angle range, the mold can be opened smoothly during molding. Therefore, in addition to the effects described above, the ease of holding and the formability become even more remarkable.
Furthermore, the buckling phenomenon starts from slight deformation at both ends. By making the shape of the both ends horizontal, it is difficult to cause micro deformation at both ends. The point of prevention of the initial stage of the ring phenomenon becomes even more remarkable.
Further, by forming the gripping concave portion so as to protrude outwardly, there is an effect of reducing the amount of deformation during pressurization, and the center portion (C) of the gripping concave portion is provided at both end portions thereof. (E) By making it longer, the central portion (C) can be easily moved, and the movement can cause the buckling phenomenon to be absorbed to make the buckling phenomenon difficult to occur.
Even a heavy, large bottle can be easily carried.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a front view of a synthetic resin bottle showing an embodiment of the present invention, FIG. 2 is a side view of the synthetic resin bottle showing an embodiment of the present invention, and FIG. 3 is a cross-sectional view taken along line II of FIG. It is. In the figure, a synthetic resin bottle 1 includes a body portion 3 of a bottle body 5 comprising a mouth portion 2, a body portion 3 and a bottom portion 4.
Gripping recesses 6 are provided on both sides, and the shortest distance (L) between the deepest portions 7 of the gripping recesses 6 on both sides is 50% or less of the diameter (D) of the body 3 (L / D ≦ 50). %), And the radial cross-sectional shape of the holding recess 6 is made symmetrical with respect to a straight line connecting the deepest portion 7 and the axial center O of the bottle body.

The bottle body 5 has a cylindrical body, and the mouth portion 2 has a spout portion 10 and a screw portion 11 for stopping the cap. The body portion 3 has a circular cross-sectional shape from the viewpoint of strength, but may be a polygonal shape.
The bottom portion 4 is convex upward, thereby protecting the gate portion and increasing the drop strength.

The holding recesses 6 are provided on both sides of the middle part of the body part 3 of the bottle body 5, and are recessed parts having a vertically long rectangle as shown in FIG. The three reinforcing beads 12 in the shape are provided at substantially equal intervals. In order to allow the reinforcing bead 12 to be carried even with a heavy bottle, the top surface height from the bottom of the depression is usually about 3 mm to 6 mm, and the pitch is about 20 mm to 25 mm. It is preferable that As shown in FIGS. 4 and 5, the three reinforcing beads 12 of the gripping recess 6 improve the anti-buckling strength, and as shown in FIGS. 4 and 5, any of the three reinforcing beads 12 in one of the gripping recesses 6 Grab the bottle by holding the thumb 13 at the deepest part 7 between the two and the remaining finger 14 at the deepest part 7 between the other three reinforcing beads 12 to grasp the body 3. These three reinforcing beads 12 also have a function of easily holding the synthetic resin bottle 1.

As shown in FIG. 3, the gripping recess 6 has a shortest distance (L) between the deepest portions 7 on both sides.
It is set to 50% or less of the diameter (D) of the body part 3, that is, L / D ≦ 50%, so that the body part 3 is easily gripped. Furthermore, the radial cross-sectional shape of the holding recess 6 is centered on the deepest portion 7, that is,
It is symmetric with respect to an alternate long and short dash line 15 passing through the axial center O of the body portion 3 and the deepest portion 7. As a result, when molding the synthetic resin bottle 1, uneven thickness, that is, overstretching whitening is difficult to occur.
In addition, deformation at the time of pressure reduction such as pinhole check or pressure reduction is difficult to occur.

FIG. 10 shows the result of analyzing the amount of displacement (maximum displacement) of the bottle shape when the bottle internal pressure is increased by computer simulation using the finite element method.
The ● marks in the figure are the results of the bottles of the shape of FIGS. The X mark is the shape of FIG. 9 showing a prototype example, and the book of FIG. 1 to FIG. 7 except that the radial cross-sectional shape of the gripping recess is not symmetrical with respect to the straight line connecting the deepest part and the axis center of the bottle. It is an analysis result about the bottle of the same shape as the bottle of the invention.
The ♦ marks represent the results of the conventional bottles shown in FIGS. As shown in FIG. 10, the bottle of the present invention (marked with a black circle) has a smoother displacement curve over a wide pressure range than the prototype (x mark) and the conventional example (marked with a black circle) where the cross-sectional shape of the holding recess is not line symmetrical. It can be seen that buckling deformation hardly occurs.

Next, in the synthetic resin bottle showing the embodiment of the present invention, the angle θ of the radial cross section of the holding recess 6
As shown in FIG. 3, 1 is in the range of 0 to 90 degrees (0 degree ≦ θ1 ≦ 90 degrees). If this angle θ1 is smaller than 0 degree (θ1 <0), the mold cannot be opened, making molding difficult.
When the angle θ1 exceeds 90 degrees (θ1> 90 degrees), the fingers are not caught between the gripping recesses 6 and are difficult to hold. A more preferable angle θ1 is 50 to 90 degrees (50 degrees ≦
θ1 ≦ 90 degrees), and this range makes the molding extremely easy and sufficiently secures fingers. The specific shape of the holding recess 6 at θ1 = 0 degree is U-shaped.

The angle θ2 formed by the alternate long and short dash lines 15 and 15 passing through both deepest portions 7 and the axial center O of the body portion 3 in the radial cross section of the gripping recess 6 is 120 degrees to 180 degrees (120 degrees ≦ θ2 ≦ 18).
0 degrees), and as a result, the torso 3 can be easily held by fingers and palms. If the angle θ2 is smaller than 120 degrees (θ2 <120 degrees), the gripping of the fingers between the gripping recesses 6 becomes less and difficult to hold, and if θ2 exceeds 180 degrees (θ2> 180 degrees), both gripping On the contrary, it becomes difficult to hold the fingers between the recesses 6 because of excessive fingers.

Moreover, the shape in the axial both ends 6a and 6b of the holding recess 6 is formed horizontally as shown in FIG. The reason for this is that the buckling phenomenon starts from the slight deformation of both end portions 6a and 6b. However, since these both end portions 6a and 6b are horizontal, the force to be deformed is dispersed, causing a slight deformation. This is because it makes it difficult.

In FIG. 11, the bottle internal pressure was increased for both bottles having the same shape except for both ends of the holding recess, with both ends having a horizontal shape (● mark) and curved shapes (▲ mark). The result of analyzing the amount of displacement (maximum displacement) of the shape by computer simulation is shown. From the figure, it can be seen that the horizontal shape of the bottle has a smoother displacement curve than that of the curved shape, in particular, and that slight deformation at the initial time of pressurization is unlikely to occur.

Moreover, in the synthetic resin bottle showing the embodiment of the present invention, the radial length of the holding recess 6 is longer at the center C than at both ends E (C> E), as shown in FIG. Is formed.
The reason is that the central portion C of the holding recess 6 is longer than the both end portions E, so that the central portion C is easy to move and absorbs the force that causes the buckling phenomenon due to the movement, making it difficult to raise. is there.

And the cross-sectional shape of the holding | maintenance recessed part 6 of the axial direction is formed so that it may protrude outward, as shown in FIG. Thus, since the R (R) at the bottom of the holding recess 6 is convex outward, the amount of deformation during pressurization can be reduced accordingly.

In addition, although the material which comprises the said synthetic resin bottle 1 is not specifically limited, Generally, polyester resins, such as polyethylene, a polyethylene terephthalate, and copolyester, a polypropylene, etc. are employ | adopted. Further, the capacity of the synthetic resin bottle 1 is not particularly limited, but is practically a large bottle of 1.8 liter, 2.7 liter, 4 liter or the like. In addition, the contents are frequently used for contents such as sake, edible oil, soy sauce, and other seasonings.

  The following examples illustrate the invention.

<Example 1>
First, the following items were measured using a 2.7 liter polyethylene terephthalate resin bottle having the shape shown in FIGS.
In addition, sensory evaluation was performed for ease of gripping.
(1) Single bottle drop strength (2) Pinhole check pressure (3) Ease of gripping

<Method for measuring physical properties>
(1) Drop strength of actual bottles 2.7 liters of tap water in a polyethylene terephthalate resin bottle is sealed and dropped naturally onto a concrete surface from a height of 30 cm. When there was no particular influence, the height was increased by 10 cm, and the height at which a relatively large influence such as a back link phenomenon or breakage occurred was measured.
50 cm or more was evaluated as ○, and less than 50 cm was evaluated as ×.

(2) Pinhole-proof check pressure Compressed air was introduced into an empty polyethylene terephthalate resin bottle and the pressure was gradually increased to measure the pressure at which the synthetic resin bottle caused a buckling phenomenon. 0.5kg / c
m ² or more was evaluated as ○, and less than 0.5 kg / cm ² was evaluated as ×.

(3) Ease of gripping With the above synthetic resin bottle fully filled with water, the ease of gripping was subjected to a sensory evaluation.

<Comparative Example 1>
12 and 13 showing a conventional example, the same items as in Example 1 were measured for a 2.7 liter polyethylene terephthalate resin bottle of the same material as in Example 1.

<Comparative Example 2>
The same items as in Example 1 were measured for a 2.7 liter synthetic resin bottle of the same material as in Example 1 with the shape of FIG.
The obtained measurement results are shown in Table 1.

According to Table 1, the synthetic resin bottle of Example 1 according to the present invention has a deeper shape of the holding concave portion in pursuit of easiness of holding, but has a higher physical property than Comparative Example 1 having a shallow holding concave portion. Since there is almost no difference and all are within the range of the performance as a synthetic resin bottle, the effect of the present invention in which a large bottle can be safely gripped is obvious.

It is a front view of a synthetic resin bottle showing an embodiment of the present invention. It is a side view of a synthetic resin bottle showing an embodiment of the present invention. It is sectional drawing which follows the II line | wire of FIG. It is a side view of the use condition of the synthetic resin bottle which shows embodiment of this invention. It is sectional drawing of the use condition of the synthetic resin bottle which shows embodiment of this invention. It is the side view seen from the II-II line side of FIG. FIG. 7 is a half-sectional view taken along line III-III in FIG. 6. It is sectional drawing which shows the prototype of a synthetic resin bottle. It is sectional drawing which shows the prototype of a synthetic resin bottle. It is a characteristic view which shows the relationship between the pressure in a pinhole check of a synthetic resin bottle, and a displacement. It is a characteristic view which shows the relationship between the pressure in a pinhole check of a synthetic resin bottle, and a displacement. It is a side view of a prior art example. It is sectional drawing which follows the IV-IV line of FIG. It is a side view of a prior art example. It is a side view of a prior art example. It is a side view of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, a, a1, a2, a3 Synthetic resin bottle 2 mouth part 3, b trunk | drum 4 bottom part 5 bottle main body 6, c holding | grip recessed part 6a, 6b, E both ends 7 deepest part 10 spout 11 screw part 12 reinforcement Bead 13 Thumb 14 Remaining finger 15 Dash-dotted line C Center part D Diameter of trunk part d, f, j Reinforcement rib e Projection top part g Holding part h Concave reinforcement rib i Concave part k Horizontal rib L Shortest distance l Back slope m Front trunk part Wall n Front inclined surface O Center axis of trunk T Center line θ1, θ2 angle

Claims (2)

In a synthetic resin bottle provided with a holding recess on both sides of the body of the bottle body consisting of the mouth, body and bottom,
The shortest distance (L) between the deepest portions of the holding recesses on both sides is 5 of the diameter (D) of the body portion.
0% or less (L / D ≦ 50%), and the radial cross-sectional shape of the gripping concave portion is bilaterally symmetrical with respect to a straight line connecting the deepest portion and the axial center of the trunk portion, and The recess has a reinforcing bead having three outwardly convex and radially extending beads arranged at predetermined intervals in the bottle axis direction, and the angle (θ1) of the radial section of the gripping recess is 0 to 90 degrees. And an angle (θ2) formed by a line connecting both deepest portions in the radial cross section of the gripping recess and the axial center of the body portion is 120 to 180 ° (0 ° ≦ θ1 ≦ 90 °) range(
120 ° ≦ θ 2 ≦ 180 °), a synthetic resin bottle. 2. The synthetic resin bottle according to claim 1, wherein the reinforcing beads in the holding recess are provided with a top surface height of 3 mm to 6 mm from the bottom of the depression and a pitch of 20 mm to 25 mm.

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