JP5799661B2 - Plastic container - Google Patents

Description

  The present invention relates to a rectangular bottle-shaped synthetic resin container particularly suitable for sale by a vending machine.

  Conventionally, a synthetic resin container is formed by forming a preform using a thermoplastic resin such as polyethylene terephthalate, and then molding this preform into a bottle shape by biaxial stretch blow molding. It is generally used in a wide range of beverage containers.

In recent years, products using this type of synthetic resin container have various capacities ranging from a large capacity exceeding 2000 ml to a small capacity of about 200 ml depending on the contents to be diversified. Things have come to be sought.
In addition, the form of sales has been diversified, and in the case of a relatively small-capacity beverage bottle container with a capacity of about 200 to 500 ml, in addition to over-the-counter sales, it is often used for sales by vending machines. (See Patent Document 1, Patent Document 2, etc.).

  As described above, this type of synthetic resin container has been rapidly and widely spread in recent years. Accordingly, for the purpose of cost reduction and waste reduction, a material is used. In order to reduce the amount of resin used, there is an increasing demand for thin containers.

  However, when the container is thinned, there is a problem that the strength as a container inevitably decreases. For this reason, for example, Patent Documents 3 to 5 propose a container that can be easily restored to its original shape even if the container is deformed in order to compensate for the strength reduction accompanying the thinning of the container.

JP 2002-83360 A JP 2006-306427 A JP 2004-292039 A JP 2004-323071 A JP 2006-327777 A

  By the way, when it is offered for sale by a vending machine, the products filled with the contents in the container are stacked in a laid state and stocked in the vending machine. Then, the product located at the lowermost side of the conveying path in the vending machine waits for the product to fall to the take-out port and be discharged while receiving a load from the subsequent product.

At this time, in a general vending machine, two stoppers are arranged above and below at an appropriate interval according to the container size near the exit of the conveyance path in the vending machine (Patent Document 1, Patent). Reference 2 etc.).
Of the two stoppers, the first stopper located below is in contact with the container side surface of the product located at the lowermost side, thereby preventing the fall. On the other hand, when the first stopper is released and the product located at the bottom is discharged, the second stopper located at the top contacts the container side of the product located at the second position from the bottom. In contact with them, it prevents multiple products from being discharged at the same time.

  For this reason, if the container shape of the lowest product is deformed so as to be crushed by receiving a load from the subsequent product, there are two products between the first stopper and the second stopper. Get in. If it does so, since it becomes impossible to contact | abut appropriately the goods in the 2nd position from the lower side, it will become impossible to suppress the fall. For this reason, there is a concern that a plurality of products may be discharged at the same time in the sales by the vending machine in which the products located at the lowermost side must be discharged to the outlet one by one.

  The containers disclosed in Patent Documents 3 to 5 described above can be expected to be easily restored to the original shape even if they are deformed by the impact when dropped in the take-out port of the vending machine. However, the resilience means that the container is flexible and the container shape is easily deformed, so that it is deformed by receiving a load from the subsequent product while being stocked in the vending machine. easy. For this reason, the container shape of the product located at the lowermost side of the conveyance path in the vending machine is deformed so as to be crushed smaller than the interval between the two stoppers arranged above and below, and a plurality of products are simultaneously It was not enough to solve the problem of being discharged.

  The present invention has been made in view of the circumstances as described above, and it is assumed that deformation has occurred while increasing the strength in the vicinity of the boundary between the shoulder and the trunk, which is likely to be deformed by a load from the lateral direction. However, it is possible to easily restore the shape, and it is a square bottle-shaped composition that is particularly suitable for sale by vending machines that balances the load resistance strength in the lateral direction and the resilience against shape change in a well-balanced manner. The purpose is to provide a resin container.

Synthetic resin container according to the present invention, the mouth portion, a shoulder portion, body portion, and includes a bottom portion, a synthetic resin container cross-sectional shape of the square of the barrel, the shoulder portion, the corner portion at least between the side surface portion of the chamfered said barrel, and the radius of curvature is interposed a curved portion of 7～20Mm, together with articulating in the barrel, at the boundary between the side surface portion and the chamfered portion of the body portion A bulging portion is formed between the pair of outer longitudinal grooves formed along the shoulder and extending to the shoulder portion. A pair of inner longitudinal grooves are formed along the height direction between the inner pressure adjusting panel formed on the side surface portion of the part and the outer longitudinal grooves.

  According to the present invention, it is possible to provide a synthetic resin container that balances the load resistance strength in the lateral direction in the vicinity of the boundary between the shoulder portion and the trunk portion, which are likely to be deformed, and the resilience to the shape change in a balanced manner. .

It is a front view showing an outline of a synthetic resin container according to an embodiment of the present invention. It is a top view which shows the outline of the synthetic resin containers which concern on embodiment of this invention. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view showing an outline of a synthetic resin container according to the present embodiment, and FIG. 2 is a plan view thereof. 3 is a cross-sectional view taken along the line AA in FIG. 1, and FIG. 4 is a cross-sectional view taken along the line BB in FIG.

  In this embodiment, the container 1 has a bottomed cylindrical preform made of a thermoplastic resin manufactured by, for example, known injection molding or compression molding, as shown in FIG. , A mouth portion 2, a shoulder portion 3, a trunk portion 4, and a bottom portion 5.

  As the thermoplastic resin constituting the container 1, any resin can be used as long as stretch blow molding is possible. Specifically, thermoplastic polyesters such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, polyarylate, polylactic acid or copolymers thereof, those blended with these resins or other resins are suitable. It is. In particular, an ethylene terephthalate thermoplastic polyester such as polyethylene terephthalate is preferably used. Further, acrylonitrile resin, polypropylene, propylene-ethylene copolymer, polyethylene and the like can be used.

  In the container 1 shown in FIG. 1, the mouth portion 2 is formed in a cylindrical shape, and a screw thread for attaching a lid body (not shown) is provided on the side surface of the mouth portion 2. Attach to mouth 2 and seal container 1.

  The trunk | drum 4 is a part which occupies most of the height direction of the container 1, and the cross-sectional shape orthogonal to a height direction is made into the square shape which chamfered the corner | angular part in this embodiment. Thereby, the trunk | drum 4 is comprised by the two sets of side parts 41 which oppose, and the chamfer part 42 located between each side part 41, and the cross-sectional shape of the container 1 is made into the square.

  The height direction means a direction perpendicular to the horizontal plane when the container 1 is erected on the horizontal plane with the mouth portion 2 up, and in this state, the vertical and vertical / horizontal directions of the container 1 are defined. It shall be.

The shoulder portion 3 is located between the mouth portion 2 and the trunk portion 4 and is formed so as to be connected to the mouth portion 2 while being narrowed down from the upper end of the trunk portion 4, and such narrowing is started. The position is defined as a boundary BL between the body 4 and the shoulder 3. And in this embodiment, the shoulder 3 is made into the trunk | drum 4 by interposing the curved-surface part 31 whose curvature radius R is 7-20 mm between at least the side part 41 of the trunk | drum 4 with which the corner | angular part was chamfered. It is connected.
Here, the curvature radius of the curved surface portion 31 refers to a curvature radius in a cross section obtained by cutting the curved surface portion 31 along a plane perpendicular to the curved surface portion 31 along the height direction.

  The vicinity of the boundary between the body portion 4 and the shoulder portion 3 is a portion that is particularly easily deformed when an external force is applied, for example, when the container 1 is dropped. For this reason, in this embodiment, the shoulder portion 3 is connected to at least the side surface portion 41 of the trunk portion 4 via the curved surface portion 31 formed of a gently curved surface. Even if is deformed, it is possible to obtain a restoring property that easily returns to the original shape. In order to obtain such a restoring property, it is preferable to connect the shoulder portion 3 via the similar curved surface portion 31 even in the chamfered portion 42 of the trunk portion 4.

  At this time, if the radius of curvature of the curved surface portion 31 exceeds the above range and the curvature becomes small, there is a tendency that sufficient recoverability cannot be obtained. Moreover, if it is less than the said range, the curvature of the curved surface part 31 will become large, and it will become impossible to ensure the required volume of the container 1. FIG.

  In securing the volume of the container 1, the radius of curvature of the curved surface portion 31 is within the above range, and the surface forming the shoulder portion 3 excluding the curved surface portion 31 exhibits an angle of 50 to 80 ° with respect to the horizontal plane. Is preferred. In forming the curved surface portion 31 connected to the upper end of the body portion 4 in the shoulder portion 3, the width W along the height direction is set to the shoulder portion 3 excluding the curved surface portion 31 according to the curvature radius R of the curved surface portion 31. It is preferable to design appropriately so that the surface forming the above is connected to the mouth portion 2 at the above angle.

In addition, a pair of outer longitudinal grooves 43 that are formed along the boundary with the chamfered portion 42 and reach the shoulder portion 3 are formed on the side surface portion 41 of the trunk portion 4.
By forming such an outer longitudinal groove 43, the strength against a load from the lateral direction can be increased. In addition to this, by bringing the upper end side of the outer vertical groove 43 to the shoulder portion 3, the resilience to the shape change of the portion including the curved surface portion 31 can be further enhanced.

  Furthermore, in the present embodiment, in order to increase the mechanical strength of the part including the curved surface part 31 near the boundary BL between the body part 4 and the shoulder part 3, and to improve the resilience to the shape change of the part, A bulging portion 32 is formed between the upper ends of the pair of outer vertical grooves 43 reaching the shoulder portion 3. The bulging portion 32 bulges from the shoulder portion 3 in a substantially rectangular shape with a predetermined lateral width that fits between the upper end sides of the pair of outer vertical grooves 43, and has a bulging surface 33 that is gently connected to the side surface portion 41 of the trunk portion 4. Form to prepare.

  In addition, the bulging surface 33 of the bulging portion 32 “smoothly continues” to the side surface portion 41 of the body portion 4 means that a step is generated at the boundary between the body portion 4 and the shoulder portion 3 where these surfaces are formed. Instead, the bulging surface 33 of the bulging portion 32 and the surface of the side surface portion 41 of the body portion 4 connected to the bulging portion 32 are continuous so as to be one surface.

  In the side wall 41 of the body 4, when the contents are hermetically sealed at high temperature and then cooled and the pressure in the container is reduced, the internal pressure adjustment panel 6 for absorbing the reduced internal pressure due to the deformation. Is formed. Although the specific form of the internal pressure adjustment panel 6 is not limited to the illustrated form, in the present embodiment, it is preferable that a part of the internal pressure adjustment panel 6 is formed so as to be laid on the bulging surface 33 of the bulging portion 32. By doing in this way, since a three-dimensional shape is added to the bulging part 32 as a rib, the improvement of mechanical strength by this can be anticipated.

  Since the bulging portion 32 includes such a bulging surface 33, when the containers 1 are stacked in a state of being laid down in the vending machine, the load is dispersed by increasing the contact area between the overlapping containers 1. Will come to do. Thereby, the deformation | transformation of the container 1 with respect to a lateral load can be prevented more effectively.

Further, in a general bottle-shaped container of this type, the internal pressure adjustment panel 6 formed on the trunk 4 protrudes beyond the boundary BL between the trunk 4 and the shoulder 3 to the shoulder 3 side. If it is formed, the strength near the boundary between the body part 4 and the shoulder part 3 may be reduced.
On the other hand, in this embodiment, since the bulging part 32 provided with the bulging surface 33 smoothly connected to the side part 41 of the trunk | drum 4 is formed in the shoulder part 3 side, the trunk | drum 4 and the shoulder part 3 and In the height direction above the boundary BL between the body portion 4 and the shoulder portion 3 so that a part of the internal pressure adjustment panel 6 is laid on the bulging surface 33 of the bulging portion 32 without causing a decrease in strength in the vicinity of the boundary. The internal pressure adjusting panel 6 can be extended. At this time, the internal pressure adjustment panel 6 is formed in a vertically long shape so that a part of the internal pressure adjustment panel 6 extends over the surface 33 of the bulging portion 32, so that the area of the panel surface of the internal pressure adjustment panel 6 is as large as possible. The internal pressure adjustment function of the adjustment panel 6 can be sufficiently ensured.

  Further, in the present embodiment, in order to further enhance the lateral load bearing strength and the resilience to the shape change, a pair of inner longitudinal grooves 44 are further provided between the inner pressure adjustment panel 6 and each outer longitudinal groove 43. Are formed along the height direction. In order to enhance the load bearing strength in the lateral direction and the resilience to the shape change, each of the pair of inner longitudinal grooves 44 is formed so as to be positioned below the height direction at both ends in the width direction of the bulging portion 32. preferable.

  At this time, in order to secure a space for forming the inner vertical groove 44, even if the inner pressure adjusting panel 6 is formed so that the lateral width is narrower than the bulging portion 32, a part of the inner pressure adjusting panel 6 is expanded. By forming the internal pressure adjusting panel 6 to be vertically long so as to hang over the bulging surface 33 of the protruding portion 32 and securing the area of the panel surface, the internal pressure adjusting function of the internal pressure adjusting panel 6 can be prevented from being impaired. .

  In addition, a shrink label made of a heat-shrinkable film material is attached to this type of container 1 for sale. Normally, the shrink label is formed such that its upper end is placed over the shoulder portion 3. 4 is attached. For this reason, it is preferable that the bulging part 32 bulging from the shoulder part 3 does not become an obstacle when the shrink film is attached. Specifically, the upper end side corner portion of the bulging portion 32 formed in a rectangular shape is formed in an arc shape, and when the shrink film is attached to the container 1, the upper end edge of the bulging portion 32 is shrunk. It is preferable to appropriately design the size of the bulging portion 32 so that it is located slightly below the upper edge of the film in the height direction.

Thus, the container 1 according to this embodiment is
1) The shoulder portion 3 is connected to the upper end of the body portion 4 through the curved surface portion 31 formed of a gently curved surface.
2) A pair of outer vertical grooves 43 reaching the shoulder portion 3 are formed on the side surface portion 41 of the trunk portion 4 along the boundary with the chamfered portion 42.
3) A bulging portion 32 including a bulging surface 33 that is gently connected to the side surface portion 41 of the trunk portion 4 is formed between the upper end sides of the pair of outer vertical grooves 43 reaching the shoulder portion 3.
4) A pair of inner vertical grooves 44 are further formed between the internal pressure adjusting panel 6 and the outer vertical grooves 43.
By providing the basic configuration, the load resistance strength in the lateral direction near the boundary between the shoulder portion 3 and the trunk portion 4 where deformation is likely to occur and the resilience to the shape change are balanced.

  As a result, the product filled with the contents in the container 1 is stacked in the vending machine while being laid down while receiving a load from the subsequent product, and deformed so as to be crushed when stocked. Can be prevented. For this reason, it is possible to effectively avoid the problem that a plurality of products are discharged at the same time in sales by a vending machine.

  Furthermore, since the container 1 according to the present embodiment also has a resilience against a shape change, for example, when the container 1 drops and is discharged from the take-out port of the vending machine, the shoulder portion 3 and the trunk portion 4 are caused by the impact. Even if the vicinity of the boundary is deformed, the original shape can be immediately restored and a good appearance can be maintained.

  Although the present invention has been described with reference to the preferred embodiments, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the present invention. Nor.

  For example, the container 1 described in the above-described embodiment is a rectangular bottle-shaped synthetic resin container suitable for sale by a vending machine, and has a relatively small capacity of about 500 ml and a used resin amount of about 24 g. Although a thin heat-resistant bottle is assumed, it can be applied to other uses. In other words, the present invention can be applied to various applications that require lateral load bearing strength and resilience to shape changes, regardless of the capacity or form of sale.

  Further, in the above-described embodiment, the cross-sectional shape of the trunk portion 4 is a square shape with chamfered corners, but for example, when applied to a relatively large capacity provided for over-the-counter sales, The cross-sectional shape of the body portion 4 may be a rectangular shape having long sides and short sides. In this case, the bulging portion 32, the outer vertical groove 43, the inner vertical groove 44, and the like as described above may be formed only on the long side surface that is susceptible to a load from the lateral direction.

  In the illustrated container 1, a waist portion 7 made of an annular recess is formed along the circumferential direction at substantially the center in the height direction of the body portion 4. However, such a waist portion 7 is necessary. It can be omitted accordingly. Furthermore, the form below this waist part 7 can be made into various forms within the range which does not impair the effect of this invention.

  The synthetic resin container according to the present invention as described above can be applied to various uses as a rectangular bottle-shaped synthetic resin container.

DESCRIPTION OF SYMBOLS 1 Container 2 Mouth part 3 Shoulder part 31 Curved part 32 Swelling part 33 Swelling surface 4 Trunk part 41 Side part 42 Chamfering part 43 Outer vertical groove 44 Inner vertical groove 5 Bottom part 6 Internal pressure adjustment panel

Claims (5)

A mouth part, a shoulder part, a trunk part, and a bottom part, and a cross section of the trunk part is a rectangular synthetic resin container,
The shoulder portion, at least between the side surface portion of the body portion corner portion is chamfered, and the radius of curvature is interposed a curved portion of 7～20Mm, together with articulating in the barrel,
It is formed along the boundary between the side surface portion and the chamfered portion of the trunk portion, and bulges from the shoulder portion between a pair of outer longitudinal grooves reaching the shoulder portion, and is gently connected to the side surface portion of the trunk portion. A bulging portion having a bulging surface is formed;
A synthetic resin container, wherein a pair of inner longitudinal grooves are formed along a height direction between an internal pressure adjusting panel formed on a side surface portion of the body portion and the outer longitudinal grooves. 2. The synthetic resin container according to claim 1, wherein the internal pressure adjustment panel has a rectangular shape, and a part of the internal pressure adjustment panel is formed on a side surface portion of the trunk portion so as to hang over a surface of the bulging portion.   The synthetic resin container according to any one of claims 1 and 2, wherein the inner longitudinal groove is formed so as to be positioned below the height direction at both ends in the width direction of the bulging portion.   The synthetic resin container according to any one of claims 1 to 3, wherein a surface forming the shoulder portion excluding the curved surface portion forms an angle of 50 to 80 degrees with respect to a horizontal plane. The synthetic resin container according to any one of claims 1 to 4, wherein an upper end side corner portion of the bulging portion has an arc shape.