JP2016094240A - Plastic bottle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plastic bottle capable of suppressing deformation in which a boundary part between an upper wall surface and a trunk of a gripping recessed part is bend and recessed.SOLUTION: A plastic bottle 1 has a trunk 3 formed with a gripping recessed part 12 recessed into a bottle inner side. The recessed part 12 has a peripheral wall part 16 rounding in an inner peripheral direction. The trunk 3 has an external surface part 3a continuous with the peripheral wall part 16 of the recessed part 12, and the peripheral wall part 16 has an upper inclination part 17 continuous with the external surface part 3a of the trunk 3 while inclining to the side of a bottle upper part. In the trunk 3, there are formed a plurality of linear reinforcement parts 20 extending toward the bottle upper part side from the upper inclination part 17 of the recessed part 12 to the external surface part 3a and then retreating to the bottle inner side.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a plastic bottle used as a beverage packaging container or the like.

  Some plastic bottles used as packaging containers and the like have a relatively large size with a capacity of about 2000 mL. When beverages or the like are contained in such a large plastic bottle up to the capacity limit, the entire weight including the contents becomes relatively heavy. As the overall weight increases, handling by the user becomes more difficult.

  Therefore, in order to improve the gripping ability of the bottle by the user, various plastic bottles are configured so that a gripping depression is provided in the body and the user's thumb or middle finger can be hooked on the depression. Have been developed (see, for example, Patent Documents 1 and 2). Also known is a plastic bottle in which a convex rib extending in the vertical direction is formed on the vertical surface (bottom surface) of the dent in order to prevent finger slipping when the bottle is tilted with the finger in the dent. (Patent Document 3). Furthermore, there is also known a plastic bottle in which a rib that extends from an upper inclined surface of a hollow portion to a lower inclined surface via a bottom surface, and a rib that connects the upper inclined surface and the lower inclined surface is formed in the hollow portion (patent) Reference 4).

JP 2011-105323 A JP 2004-292039 A JP 2005-89973 A JP 2007-284123 A

  In recent years, weight reduction of plastic bottles has been demanded in order to reduce material costs and transportation costs. If the weight is reduced while maintaining the capacity of the plastic bottle, the thickness of the bottle is reduced, so that the rigidity is lowered. In particular, in the case of a large plastic bottle, the weight in the state in which the contents are stored becomes relatively heavy, so that a lack of rigidity is likely to be manifested.

  In the case of a plastic bottle provided with a depression as in each of the above patent documents, when the user lifts the bottle with a finger in the depression, the side surface of the finger is pushed into the upper inclined surface of the depression. The stress tends to concentrate on the part. Thereby, the boundary part of the upper inclined surface of a hollow part and a trunk | drum may bend and the deformation | transformation which dents may arise. If the deformation occurs in the process of lifting the bottle with the finger in the depression and moving it, or tilting it and performing the dispensing operation, the user is forced to apply the finger force to the upper inclined surface of the depression. It becomes necessary to strengthen the support of fingers and palms that are not in the recesses in order to support the bottle. As a result, the gripping property of the plastic bottle may be deteriorated. Such deformation tends to occur as the thickness of the bottle becomes thinner as the weight is reduced, which may hinder the weight reduction of the plastic bottle.

  Although the plastic bottle of patent document 3 or 4 has the rib formed in the hollow part, the formation site | part is restricted to the inclined surface and bottom face of a hollow part. Therefore, although the rib of these literatures can contribute in order to improve the rigidity of hollow part itself, it does not contribute to suppression of a deformation | transformation of the boundary part of the upper inclined surface and trunk | drum of the above hollow parts.

  Then, an object of this invention is to provide the plastic bottle which can suppress the deformation | transformation which the boundary part of the upper wall surface of the holding | grip hollow part and a trunk | drum will bend and dent.

  The plastic bottle of the present invention includes a body portion (3) formed with a hollow portion (12) for gripping that is recessed toward the inside of the bottle, and the hollow portion has a peripheral wall portion (16) that makes a round in the inner peripheral direction. In the plastic bottle, the barrel portion has an outer surface portion (3a) continuous with the peripheral wall portion of the hollow portion, and the peripheral wall portion is continuous with the outer surface portion of the barrel portion while being inclined toward the bottle upper side. An upper inclined portion (17) is provided, and the body portion extends from the upper inclined portion of the hollow portion to the outer surface portion toward the upper side of the bottle and retreats toward the inner side of the bottle. Or the some linear reinforcement part (20 ...) which protrudes to the bottle outer side is formed.

  According to this plastic bottle, since the plurality of linear reinforcing portions extend from the upper inclined portion of the hollow portion to the outer surface portion of the trunk portion, the rigidity of the boundary portion between the upper inclined portion and the outer surface portion is increased. Reinforced. Therefore, even when the user puts a finger into the depression and lifts the bottle to handle it, even if it is pushed in by the side of the finger, each of the plurality of linear reinforcing parts that cross the boundary part without stress being concentrated on one point of the boundary part The stress is dispersed. For this reason, the deformation | transformation which the boundary part of an upper side inclination part and an outer surface part bends and dents is suppressed. Thereby, the deterioration of the grip property of a bottle at the time of a user putting a finger in a hollow part and lifting a bottle can be suppressed.

  As long as the hollow part of the plastic bottle of this invention is formed in the trunk | drum, number, a position, a shape, a magnitude | size, etc. are arbitrary. For example, in one aspect of the plastic bottle of the present invention, the body portion may be formed so that at least a pair of the recessed portions face each other. According to this aspect, when the user grips the bottle, the user can grip the bottle with the first finger in one of the recesses facing each other and the second finger in the other recess. Will improve. In this aspect, two or more pairs of recesses facing each other may exist.

  The number of the plurality of linear reinforcement portions is not particularly limited as long as it is plural, but there is a preferable range for the number of linear reinforcement portions in the case of a plastic bottle having the following configuration.

  That is, in one aspect of the plastic bottle of the present invention, the recess is configured to have a width in the left-right direction of the bottle and a lateral width (Wde) set in a range of 30 mm to 40 mm, When the region where the linear reinforcing portion is formed is defined as an arrangement region (Adi), the lateral width (Wdi) of the placement region in the horizontal direction of the bottle is narrower in the range of 5 mm or less than the lateral width of the recess. The number of the plurality of linear reinforcing portions may be four or less.

  In this aspect, the number of the plurality of linear reinforcing portions may be three. If the number of the linear reinforcing portions is two or more, the above-described deformation suppressing effect is exhibited. However, as a result of the inventors conducting a predetermined evaluation test, the number of the linear reinforcing portions is three. Was found to be most preferred.

  As long as the plastic bottle of the present invention includes the peripheral wall portion, there is no particular limitation on the shape of the recessed portion. For example, the peripheral wall portion may be configured as a concave curved surface and a recess portion is formed, and the bottom portion may not be considered in the recess portion, or the recess portion may be configured to distinguish the bottom portion from the peripheral wall portion. Also good.

  In the case where the bottom part and the peripheral wall part can be distinguished from each other, in one aspect of the plastic bottle of the present invention, the hollow part has a bottom part (15) connected to the peripheral wall part, and the upper inclined part extends from the bottom part to the bottle. The outer surface portion of the trunk portion is connected to the outer surface portion of the trunk portion while being inclined to the upper side, and at least one of the plurality of linear reinforcing portions is connected to the outer surface of the trunk portion from the bottom portion via the upper inclined portion. It may extend to the part. According to this aspect, not only the boundary portion between the upper inclined portion and the outer surface portion, but also the boundary portion between the bottom portion and the upper inclined portion can be reinforced by at least one of the plurality of linear reinforcing portions. As a result of increased rigidity, an improvement in gripping ability of the bottle can be expected.

  In the present invention, the terms indicating the vertical direction such as the bottle upper side and the bottle lower side are directions based on the bottle, and do not mean an absolute direction such as a horizontal direction or a vertical direction. The direction toward the bottle upper side, which is the direction in which the plurality of linear reinforcing portions extend, may be a direction that coincides with the vertical direction of the bottle, or may be an oblique direction with respect to the vertical direction of the bottle. All of the plurality of linear reinforcing portions may be parallel to each other, or some or all of these may be non-parallel to each other. Moreover, in the above description, in order to facilitate understanding of the present invention, reference numerals in the accompanying drawings are added in parentheses, but the present invention is not limited to the illustrated form.

  As described above, according to the plastic bottle of the present invention, since the plurality of linear reinforcing portions extend from the upper inclined portion of the hollow portion to the outer surface portion of the trunk portion, the upper inclined portion and the outer surface As a result of the rigidity of the boundary portion with the portion being increased and reinforced, the deformation of the boundary portion being bent and recessed can be suppressed.

The perspective view of the plastic bottle which concerns on one form of this invention. The front view of the plastic bottle of FIG. The side view which showed the state seen from the arrow III direction of FIG. The top view which showed the state seen from the arrow IV direction of FIG. Sectional drawing regarding the Va-Va line | wire of FIG. Sectional drawing regarding the Vb-Vb line | wire of FIG. Sectional drawing regarding the Vc-Vc line | wire of FIG. Sectional drawing regarding the Vd-Vd line | wire of FIG. Sectional drawing regarding the Ve-Ve line | wire of FIG. Sectional drawing regarding the Vf-Vf line | wire of FIG. Sectional drawing regarding the Vg-Vg line | wire of FIG. The elements on larger scale of the VI section of FIG. The projection figure used for definition of each parameter, such as a hollow part. The other projection figure used for definition of each parameter, such as a hollow part. The figure which showed the test result of the sensory evaluation test. The figure which showed the test result of the myoelectric potential evaluation test. The elements on larger scale which showed the modification of the linear reinforcement part which expanded the same location as FIG.

  The plastic bottle 1 shown in FIGS. 1 to 4 is manufactured by blow molding using polyethylene terephthalate (PET), which is a kind of plastic. The plastic bottle 1 is designed assuming a packaging container for non-carbonated beverages such as mineral water, green tea, and tea. In general, a non-carbonated beverage packaging container can be made lighter and thinner than a packaging container containing a carbonated beverage that requires pressure resistance because the non-carbonated beverage is a content.

  As shown in FIGS. 1 to 4, the plastic bottle 1 is a large-sized so-called square bottle having a capacity capable of containing 2000 mL of liquid, and its corners are rounded when viewed from the vertical direction of the bottle. It has a substantially rectangular shape (see FIG. 4). In addition, the bottle up-down direction corresponds with the up-down direction of FIG.2 and FIG.3.

  The plastic bottle 1 includes a mouth part 2 that functions as a spout for contents, a cylindrical body part 3 that extends in the bottle vertical direction, a shoulder part 4 that connects the mouth part 2 and the body part, And a bottle bottom 5 that closes the lower end. A male screw is formed around the mouth 2, and a cap (not shown) is screwed into the male screw so that the mouth 2 is closed and sealed. The body part 3 is formed with a waist part 10 which is located substantially at the center in the height direction and whose outer peripheral dimension is narrower than other parts, and is elongated on the outer surface part 3a of the body part 3 in the circumferential direction. A large number of reinforcing grooves 11 that recede toward the inside of the bottle are formed mainly to increase the rigidity. The detailed arrangement and function of each reinforcing groove 11 are not related to the present invention, and thus the description thereof is omitted.

  The body 3 is formed so that a grip recess 12 positioned substantially at the center in the height direction and at the center in the left-right direction in FIG. 2 overlaps the waist 10. As is clear from FIG. 3, the hollow portion 12 is also formed in the same form on the back side of the body portion 3 (the opposite side of FIG. 2). Hereinafter, unless otherwise specified, the present embodiment will be described without distinguishing the two recessed portions 12.

  As shown in FIG.1 and FIG.2, the hollow part 12 has the form opened in the substantially rectangular shape whose length of the edge of a bottle up-down direction is shorter than the length of the edge of a bottle left-right direction. The hollow portion 12 includes a bottom portion 15 and a peripheral wall portion 16 that extends from the periphery of the bottom portion 15 to the outside of the bottle and continues to the outer surface portion 3a of the trunk portion 3. The peripheral wall portion 16 makes a round in the inner peripheral direction of the hollow portion 12.

  The form of the peripheral wall part 16 can be grasped by referring to FIGS. 5A to 5G and FIG. 6 together with FIG. That is, the peripheral wall portion 16 is inclined to the bottle upper side while being inclined to the outer surface portion 3a of the trunk portion 3, and the lower inclined portion 18 being inclined to the bottle lower side and being continuous to the outer surface portion 3a, Two connecting slopes connected to the outer surface portion 3a are connected symmetrically while connecting the end portions in the left-right direction of the upper inclined portion 17 and the lower inclined portion 18 and inclining from the bottom portion 15 to the left side and the right side of the bottle, respectively. Part 19.

  When the user lifts and moves the plastic bottle 1 in which the beverage is stored in a state where the finger is put in the dent 12, or when the user performs a beverage pouring operation by tilting the plastic bottle 1, The side is pushed and a load is applied to that part. If it does so, as shown in FIG. 6, there exists a tendency for stress to concentrate on the boundary part S1 of the upper side inclination part 17 and the outer surface part 3a.

  Therefore, the three linear reinforcing portions 20 shown in FIGS. 2, 5B, 5C, and 6 are formed on the body portion 3 of the plastic bottle 1 of the present embodiment so as to cross the boundary portion S1. . That is, the three linear reinforcing portions 20... Extend from the upper inclined portion 17 to the outer surface portion 3a starting from the boundary portion S0 with the bottom portion 15 of the hollow portion 12 so as to elongate toward the bottle upper side. Is formed. All of the three linear reinforcing portions 20 have the same length and shape, and are formed in a groove shape so as to recede toward the inside of the bottle. The upper end portion 20a and the lower end portion 20b of each linear reinforcing portion 20 are both formed in an arc shape, and molding defects are less likely to occur when the plastic bottle 1 is manufactured by blow molding.

  According to the plastic bottle 1, since the three linear reinforcing portions 20 extend from the upper inclined portion 17 of the hollow portion 12 to the outer surface portion 3a of the trunk portion 3, the upper inclined portion 17 and the outer surface portion. The rigidity of the boundary portion S1 with 3a is increased and reinforced. Therefore, even if the user puts a finger into the recess 12 and lifts and handles the plastic bottle 1, the user does not concentrate the stress on one point of the boundary portion S1 and crosses the boundary portion S1. Stress is dispersed in each of the linear reinforcing portions 20. For this reason, the deformation | transformation which the boundary part S1 bends and dents is suppressed.

  By suppressing the deformation of the boundary portion S1, the user can lift and move the plastic bottle 1 with a finger placed in the dent 12, or incline obliquely and perform a dispensing operation. The finger put in can be firmly hooked on the upper inclined portion 17 and the finger can be sufficiently applied. Thereby, an extra force is not applied to the finger or the palm that is not in the hollow portion 12. Thereby, the deterioration of the grip property of a bottle at the time of a user putting a finger in the hollow part 12 and lifting and handling the plastic bottle 1 can be suppressed.

  The plastic bottle 1 is provided with three linear reinforcing portions 20..., But it has been found that if the number is two or more, the above-described deformation suppressing effect is exhibited. The superiority that the number of the linear reinforcing portions is three could be confirmed from the results of the sensory evaluation test and the myoelectric potential evaluation test for the following test subjects conducted by the inventors of the present case.

(Preparation of test subject)
A comparative example having the same shape and size as the plastic bottle 1 was prepared except that the above-described linear reinforcing portion was not provided. In addition, the same shape and size as the plastic bottle 1 and the number of linear reinforcing portions are two examples A and four examples C, and the plastic bottle 1 is an example product, and linear reinforcing Example B with three parts was prepared. The container weight (referring to the weight in the empty state; the same shall apply hereinafter) is 29 g in both the comparative example and the three Examples A to C.

  The definitions and dimensions of various parameters of the comparative example and the recessed portion of each of Examples A to C and the linear reinforcing portion of each of Examples A to C will be described. As shown in FIG. 7, the dimension of each parameter of the hollow portion and the linear reinforcing portion is defined on a projected view of a scale of 1: 1 projected on a planar projection surface parallel to the vertical direction of the bottle. The dimension being defined on the projection means not measuring the actual object but measuring the length of each parameter appearing in the drawing. In addition, the presence of grooves, protrusions, and the like present in the recesses and the outer surface is ignored.

  In addition, although the following description also makes the object the same parameter of a comparative example, the same referential mark as the referential mark used with the said form is attached | subjected and demonstrated for convenience of explanation. The up-down direction and the left-right direction in FIG. 7 correspond to the bottle up-down direction and the bottle left-right direction, respectively. The definition of each parameter shown in FIG. 7 is as follows.

Adi: Arrangement Area The arrangement area Adi is an area in which a plurality of linear reinforcing portions 20 are formed. The limit of the arrangement region Adi in the left-right direction of the bottle is defined by the center lines CLx of the linear reinforcing portion 20 located on the rightmost side and the linear reinforcing portion 20 located on the leftmost side.

Wdi: Horizontal width of the arrangement area This horizontal width Wdi is equal to the limit of the arrangement area Adi in the left-right direction of the bottle. Accordingly, the lateral width Wdi corresponds to the distance between the center line CLx of the rightmost linear reinforcing portion 20 and the center line CLx of the leftmost linear reinforcing portion 20.

Wde: Horizontal width of the hollow part This horizontal width Wde is the maximum width in the left-right direction of the bottle at the boundary line Bo between the hollow part 12 and the outer surface part 3a of the body part 3. Since the hollow portion 12 is roughly rectangular on the projection, the lateral width Wde is constant in the bottle vertical direction. Note that the width Wde may vary in the bottle vertical direction depending on the shape of the recess 12.

Hde: Height of the hollow portion This height Hde is the maximum width of the boundary line Bo in the vertical direction of the bottle. Similar to the lateral width Wde, the recess 12 is roughly rectangular on the projection, so the height Hde is constant in the left-right direction of the bottle. Note that the height Hde may vary in the left-right direction of the bottle depending on the shape of the recess 12.

  The definitions and dimensions of the other parameters are defined on the drawing of FIG. 8, which is a projection view projected onto a planar projection plane perpendicular to the projection plane of FIG. However, since the depression 12 is hidden in the projection view, it is drawn in FIG. 8 with hidden lines. Further, the presence of grooves, protrusions, etc. existing in the depression 12 is ignored.

Dp: Depth of depth When depth Dp is perpendicular to the bottom 15 from the outermost position of the outer surface 3a of the body 3 (the position of the outer surface 3a below the bottle in FIG. 8) Is the length of the perpendicular.

θup: Inclination angle of the upper inclined portion The inclination angle θup is an angle formed between the surface of the bottom portion 15 and the surface of the upper inclined portion 17.

<Each dimensional numerical value of Examples A to C and Comparative Example>
(Example A)
Wdi: 28 mm, Wde: 33 mm, Hde: 25 mm, Dp: 13 mm, θup: 104 °
(Example B)
Wdi: 30 mm, Wde: 33 mm, Hde: 25 mm, Dp: 13 mm, θup: 104 °
(Example C)
Wdi: 30 mm, Wde: 33 mm, Hde: 25 mm, Dp: 13 mm, θup: 104 °
(Comparative example)
Wde: 33 mm, Hde: 25 mm, Dp: 13 mm, θup: 104 °

(Sensory evaluation test)
Four samples were made with 2000 mL of water in each of the four bottles of Comparative Example, Example A, Example B, and Example C. 5 male and female subjects in a bottle in a glass placed at a common reference position by lifting the first finger in one dent of each sample and the third finger in the other dent. The operation of pouring water was carried out. And each sample evaluated each sample by the score | rank ranked as follows from a viewpoint of the ease of use for each test subject who implemented the said operation | movement. And the total score for every sample was averaged and it totaled as an evaluation score of each sample.

・ 4 points: very easy to use ・ 3.5 points: easy to use ・ 3 points: normal (not easy to use, not difficult to use)
-2.5 points: difficult to use-2 points: quite difficult to use-1 point: very difficult to use

  The tabulated results of this test are as shown in FIG. As shown in FIG. 9, with reference to 2.69 points, which are the evaluation points of the comparative example, in Examples A to C in which a plurality of linear reinforcing portions are provided, all of the evaluation points are 2.69 points. Above the point. From this result, it can be judged that the gripping property of the bottle is improved by suppressing the deformation of the boundary portion by the plurality of linear reinforcing portions.

  The evaluation score of Example A was 3.88 points, the evaluation score of Example B was 3.93 points, and the evaluation score of Example C was 3.91 points. Among Examples A to C, the highest evaluation score was Example B having three linear reinforcement portions, and the next highest evaluation score was implementation having four linear reinforcement portions. In Example C, the evaluation score was low in Example A having two linear reinforcing portions. Therefore, the most preferable number of linear reinforcing portions from the viewpoint of ease of use is three.

(Myoelectric evaluation test)
Four samples of the same weight were prepared with 2000 mL of water in each of the four bottles of Comparative Example, Example A, Example B, and Example C. Three males and females were allowed to perform a lifting operation to a common reference position in a state where the first finger was placed in one depression of each sample and the third finger was placed in the other depression. The physical load on the subject's arm in the movement process was digitized by measuring the myoelectric potential of each muscle of each subject, and the values reflecting the physical load were tabulated for each sample.

・ Superficial finger flexor muscles: muscles used to flex the 2nd to 5th fingers ・ Total finger extensor muscles: muscles used to extend the 2nd to 5th fingers ・ Radial carpal extensor muscles: wrist joints Muscles used for flexion and extension

  The tabulated results of this test are as shown in FIG. As shown in FIG. 10, on the basis of an average value 0.0448 obtained by averaging the sum of numerical values of each myoelectric potential related to the comparative example, any average value of Examples A to C in which a plurality of linear reinforcing portions are provided. Is also below the comparative example. This means that the physical load on the subject's arm is reduced. Therefore, it can be said that providing a plurality of linear reinforcing portions improves the gripping property of the bottle and makes it easy to use.

  For each measured myoelectric potential, each myoelectric potential of the long thumb abductor used at the time of abduction of the first finger placed in the depression and the first dorsal interosseous muscle used at the time of adduction of the first finger is Not included. That is, the low average value means that the physical load other than the first finger is reduced. Thereby, in any of Examples A to C in which a plurality of linear reinforcing portions are provided, the deformation of the boundary portion described above is suppressed as compared with the comparative example, and extra force is applied to fingers and palms other than the first finger. Means that is not added.

  The average value of Example A was 0.0388, the average value of Example B was 0.0271, and the average value of Example C was 0.0359. Among Examples A to C, the lowest average value is Example B in which three linear reinforcing portions are provided, and the next lowest average value is in which four linear reinforcing portions are provided. In Example C, the average value was highest in Example A in which two linear reinforcing portions were provided. Therefore, the most preferable number of linear reinforcing portions from the viewpoint of physical load is three.

(Summary of evaluation results)
From the above test results, it was found that the sensory evaluation reflecting ease of use and the myoelectric potential evaluation reflecting physical load had a correlation with each other. From these two viewpoints, the most preferable number of the linear reinforcing portions is three, the next preferable number of the linear reinforcing portions is four, and the next preferable number of the linear reinforcing portions is two. Thus, the order of superiority in terms of the number of linear reinforcements was found. In addition, when the number of the linear reinforcement parts is 5 or more, there is an advantage over the comparative example, but there is no particular advantage compared to the case of Examples A to B where the number is 2 to 4.

(Modification)
The plastic bottle of this invention is not limited to the said form, It can implement with a various form within the range of the summary of this invention. The material of the plastic bottle is not limited, and any material may be used as long as it belongs to the category of plastic. For example, a plastic bottle made of a polyolefin such as polyethylene or polypropylene may be used. The use of the plastic bottle is not necessarily limited to beverage packaging containers. For example, it may be a plastic bottle used as a packaging container for liquid foods such as liquid seasonings such as vegetable oil and soy sauce. Alternatively, it may be a plastic bottle used as a packaging container for liquid non-food such as liquid chemicals and detergents.

  Moreover, if it is a plastic bottle in which the hollow part is formed, there will be no restriction | limiting also in the capacity | capacitance. Although the plastic bottle of the said form has a capacity | capacitance which can store 2000 mL of liquids, for example, the plastic bottle with a capacity | capacitance of 1000 mL smaller than the plastic bottle of the said form can also be an application object of this invention. In addition, it is well known that a plastic bottle capable of containing 4000 mL of liquid has a handle, but instead of providing such a handle, a hollow portion as described above is formed in the body. Can be held and held. Therefore, the present invention can also be applied to a plastic bottle that can hold a liquid having a weight of 1000 mL to 4000 mL, which is relatively large and contains a heavy content.

  Although the plastic bottle of the said form looks roughly rectangular when it sees from a bottle up-down direction, and a pair of hollow part is formed in each of the long side of the rectangle, it is not limited to this. It is also possible to apply the present invention to a plastic bottle that looks square when viewed from the same direction, and to implement the present invention in such a form that a pair of depressions are provided on each side facing each other. In short, the present invention can also be implemented in a form in which depressions are provided on each of the sides facing each other when a rectangular shape including a rectangle and a square is seen when viewed from above and below the bottle. But this invention is not limited to the plastic bottle of the shape which looks rectangular when it sees from a bottle up-down direction. For example, the present invention can be applied to a plastic bottle that looks like a non-polygonal shape such as a circular shape or an oval when viewed from the same direction, or a plastic bottle that looks like a shape close to such a non-polygonal shape.

  Although the said form can distinguish the bottom part 15 and the surrounding wall part 16 of the hollow part 12, the surrounding wall part of a hollow part is comprised by the concave curved surface shape, for example, and the bottom part cannot be considered in the hollow part. There may be. Also in this case, since the upper inclined portion is present in the peripheral wall portion, the present invention can be implemented in a form in which a plurality of linear reinforcing portions similar to the above-described form extending from the upper inclined portion to the outer surface portion are provided. .

  The linear reinforcement part of the said form is not formed in the bottom part 15 of the hollow part 12, as shown in FIG. However, as shown in FIG. 11, the present invention is changed to a plurality of linear reinforcing portions 20 ′ extending from the bottom portion 15 to the outer surface portion 3 a of the trunk portion 3 via the upper inclined portion 17. It can also be implemented. Further, these linear reinforcing portions can be extended to the lower inclined portion. In the case of FIG. 11, not only the boundary portion S1 between the upper inclined portion 17 and the outer surface portion 3a but also the boundary portion S0 with the bottom portion 15 can be reinforced by the plurality of linear reinforcing portions 20 ′. As a result of increasing the rigidity of the bottle itself, improvement in the gripping ability of the bottle can be expected. In the case of FIG. 11, only some of the plurality of linear reinforcing portions may be formed on the bottom.

  Although the number of the linear reinforcement part of the said form is three, it does not restrict | limit in particular. As in the examples used in the evaluation test described above, the present invention can be implemented in a form in which two or four linear reinforcing portions are provided. The above-described linear reinforcing portions are all receded to the inside of the bottle, but on the contrary, it is also possible to carry out with a shape protruding to the outside of the bottle. In this case, any or all of the plurality of linear reinforcing portions can be implemented in a shape protruding to the outside of the bottle. The lengths of the plurality of linear reinforcing portions do not have to be all aligned, and some or all of the lengths may be different from each other.

  In the above embodiment, each linear reinforcing portion is a straight line when the plastic bottle is viewed from the side (see FIG. 2), but each linear reinforcing portion may be a curve when viewed from the same direction.

  In each of the above-described Examples A to C, the lateral width Wdi of the plurality of linear reinforcing portion arrangement regions Adi, the lateral width Wde of the recessed portion, the height Hde of the recessed portion, the depth Dp of the recessed portion, and the upper inclined portion Each dimension value of the inclination angle θup is only an example, and these dimension values may be determined as appropriate. However, these parameters have the following preferred ranges.

30 mm ≦ Wde ≦ 40 mm, Wde−Wdi ≦ 5 mm,
20 mm ≦ Hde ≦ 30 mm, 10 mm ≦ Dp ≦ 15 mm,
100 ° ≦ θup ≦ 110 °

DESCRIPTION OF SYMBOLS 1 Plastic bottle 3 trunk | drum 3a outer surface part 12 hollow part 15 bottom part 16 peripheral wall part 20 linear reinforcement part 20a upper end part 20b lower end part

Plastic bottle according to the present invention includes recess for gripping recessed bottle inner side (12) body portion formed has a (3), wherein the peripheral wall (16) of a round on the inner circumferential direction of the recess The plastic bottle which a hollow part has WHEREIN : The said trunk | drum has the outer surface part (3a) connected with the said surrounding wall part of the said hollow part, and the said surrounding wall part inclines the said outer side of the said trunk | drum while inclining to a bottle upper part side. upper inclined portion continuous to the surface portion has a (17), said barrel, said upper inclined by Rukoto extends toward the bottle upper side from the upper inclined portion of the recess portion up to the outer surface portion A plurality of linear reinforcing portions (20...) Are formed so as to cross the boundary portion (S1) between the outer surface portion and the outer surface portion, and recede toward the bottle inner side or protrude toward the bottle outer side. .

Claims (5)

In a plastic bottle comprising a barrel portion formed with a hollow portion for gripping recessed inside the bottle, and having a peripheral wall portion that makes a round in the inner circumferential direction of the hollow portion,
The trunk portion has an outer surface portion connected to the peripheral wall portion of the hollow portion,
The peripheral wall portion has an upper inclined portion that is continuous with the outer surface portion of the body portion while being inclined toward the bottle upper side,
A plurality of lines extending toward the bottle upper side from the upper inclined portion of the hollow portion to the outer surface portion, and retracting toward the bottle inner side or projecting toward the bottle outer side. A reinforced part is formed,
A plastic bottle characterized by that.   The plastic bottle of Claim 1 currently formed in the said trunk | drum so that a pair of said hollow part may mutually oppose. The indented portion is configured to have a width in the left-right direction of the bottle and a lateral width set in a range of 30 mm or more and 40 mm or less,
When an area in which the plurality of linear reinforcing portions are formed is an arrangement area, the horizontal width of the arrangement area in the left-right direction of the bottle is narrower in the range of 5 mm or less than the horizontal width of the depression. And
The plastic bottle according to claim 2, wherein the number of the plurality of linear reinforcing portions is four or less.   The plastic bottle according to claim 3, wherein the number of the plurality of linear reinforcing portions is three. The hollow portion has a bottom portion continuous with the peripheral wall portion, and the upper inclined portion is continuous with the outer surface portion of the trunk portion while being inclined from the bottom portion to the bottle upper side,
5. At least one of the plurality of linear reinforcement portions extends from the bottom portion to the outer surface portion of the trunk portion via the upper inclined portion. The described plastic bottle.

Images