JP6957103B2 - Flat container made of synthetic resin - Google Patents

Description

The present invention relates to a flat container made of synthetic resin, which includes a tubular mouth portion and a flat body portion connected to the mouth portion, and discharges the contents by squeezing the body portion.

Conventionally, it is made of a synthetic resin having a tubular mouth portion and a body portion connected to the mouth portion to form a storage space for the contents as a container for accommodating various contents such as foods and cosmetics. Containers are known (see, for example, Patent Document 1).

Further, for example, as a flat container made of synthetic resin used for contents having a relatively high viscosity, there is a form in which the contents contained therein are extruded by squeezing a flexible body portion. In such a container, in order to easily perform a crushing operation of the body portion, a container having a flat body portion having a substantially elliptical cross section is known. By making the body part flat, it becomes easy to crush the body part by sandwiching it from both sides in the thickness direction.

Japanese Patent No. 4137523

By the way, when filling a container with the contents, the contents in a high temperature state preheated are filled in the container, and a cap is attached and sealed before the temperature of the contents drops, so-called heat filling. There is a way.

In this heat filling, since the container containing the heated contents is sealed and then the cooling step of cooling to a predetermined temperature is performed, the inside of the container is decompressed as the temperature of the contents decreases. For this reason, the body of the container may be deformed unintentionally, such as a non-uniform dent, which may impair the appearance or reduce the strength.

The present invention has been developed to solve the above-mentioned problems, and provides a flat container made of synthetic resin capable of preventing erroneous deformation when the contents are heat-filled in a flat container. The purpose is.

The synthetic resin flat container of the present invention includes a tubular mouth portion, a shoulder portion connected to the mouth portion, a body portion connected to the shoulder portion, and a bottom portion connected to the body portion and closed. A flat container made of synthetic resin that squeezes and discharges the contents.
The body has a flat shape in which the width in the left-right direction is larger than the thickness in the front-rear direction.
The body portion includes front wall and back wall arranged to face each other in the thickness direction of the body portion, and bent portions on both left and right sides that form a boundary between the front wall and the back wall at both ends in the width direction of the body portion. And with
The body portion has a center located on the center axis of the body portion in a cross section perpendicular to the axis direction of the body portion, and passes through the widthwise center of the front wall and the widthwise center of the back wall. A predetermined shape portion on which the contour line of the body portion is located is provided on the circle, and a portion other than the predetermined shape portion is located outside the virtual circle.
At least a part of the front wall and the back wall is provided with flat portions having straight contour lines in the cross section adjacent to the bent portions on both the left and right sides.

In the synthetic resin flat container of the present invention, it is preferable that the body portion has a symmetrical shape in the front-rear direction and a symmetrical shape in the left-right direction.

Further, in the flat container made of synthetic resin of the present invention, in the cross section,
The internal angle of the bent portion is preferably 90 ° or more and 120 ° or less.

According to the present invention, it is possible to provide a flat container made of synthetic resin capable of preventing erroneous deformation when the contents are heat-filled in a flat container.

It is a front view of the flat container made of synthetic resin which concerns on one Embodiment of this invention. It is a top view of the flat container made of synthetic resin shown in FIG. It is a side view of the flat container made of synthetic resin shown in FIG. It is sectional drawing which shows the AA cross section in the flat container made of synthetic resin of FIG.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

The synthetic resin flat container 1 (hereinafter, also referred to as “container 1”) of the present embodiment shown in FIGS. 1 to 4 has a tubular mouth portion 10, a shoulder portion 11b connected to the mouth portion 10, and a shoulder portion 11b. A continuous body portion 11a and a bottom portion 11c connected to the body portion 11a are provided. The inside of the container 1 is a storage space S for the contents. In the present embodiment, the mouth portion 10 is formed in a cylindrical shape, and a male screw 10a to which a cap or the like can be attached is provided on the outer peripheral surface thereof. Further, the tip opening 10b of the mouth portion 10 serves as a discharge port for the contents.

As shown in FIGS. 1 and 3, the body portion 11a has a flat shape in which the width W in the left-right direction is larger than the thickness T in the front-rear direction. The body portion 11a has flexibility and is configured to be able to squeeze in the thickness direction (minor axis direction) when discharging the contents. The body portion 11a is formed in a cylindrical shape extending straight in the axial direction along the central axis O. The body portion 11a may have a constant shape of a cross section (cross section) perpendicular to the central axis O, or may have, for example, a constricted portion having a small outer diameter of the cross section.

The shoulder portion 11b (the region above the body portion 11a in FIG. 1) connected to one side (upper side) in the axial direction along the central axis O of the body portion 11a is gradually reduced in diameter from the connecting portion to the body portion 11a. At the same time, the tip thereof is connected to the mouth portion 10. Further, the bottom portion 11c (the region on the lower side of the body portion 11a in FIG. 1) connected to the other side (lower side) of the body portion 11a in the axial direction is gradually reduced in diameter toward the tip and closed at the tip. .. The bottom portion 11c has a curved shape that bulges downward as a whole. As described above, in the container 1 of the present embodiment, since the entire bottom portion 11c to be closed has a curved shape that bulges downward, the bottom portion is compared with the container closed by the bottom wall perpendicular to the central axis O. Therefore, it is easy to crush the body portion 11a in the thickness direction.

The body portion 11a, the shoulder portion 11b, and the bottom portion 11c have a front wall 12 and a back wall 13 which are arranged so as to face each other in the thickness direction with the central axis O interposed therebetween. Further, the body portion 11a has bent portions 14 on both left and right sides that form a boundary between the front wall 12 and the back wall 13 at both ends in the width direction of the body portion 11a. The bent portion 14 extends parallel to the axial direction. In this example, the bent portion 14 extends linearly along the parting line PL of the mold. In this example, the bent portion 14 is configured to be a starting point when the body portion 11a is crushed in the thickness direction and one of the front wall 12 and the back wall 13 is inverted and deformed toward the other. In this example, the front wall 12 and the back wall 13 have a symmetrical shape in the front-rear direction, and the bent portions 14 on both the left and right sides also have a symmetrical shape. That is, the body portion 11a has a shape that is symmetrical in the front-rear direction and symmetrical in the left-right direction.

Here, FIG. 4 shows a cross section of the body portion 11a at the position of the line AA in FIG. As shown in FIG. 4, on the left and right sides of the body portion 11a, a pair of front and rear flat portions 15 having a linear contour line on the outer surface are provided on the front wall 12 and the back wall 13 sandwiching the bent portion 14. There is. The flat portion 15 is provided adjacent to the bent portion 14. The width of the flat portion 15 of this example gradually increases downward from the vicinity of the boundary between the body portion 11a and the shoulder portion 11b, and gradually decreases downward from the maximum width position. The shape of the flat portion 15 is not limited to the illustrated example, and the width may be constant along the axial direction, for example. Further, the flat portion 15 may be provided at least in a part of the body portion 11a in the height direction. A curved portion 16 having an arcuate contour line is provided in the central portion between the left and right flat portions 15.

Here, as shown in the cross section of FIG. 4, the body portion 11a has a center located on the central axis O of the body portion 11a, and passes through the center in the width direction of the front wall 12 and the center in the width direction of the back wall 13. A predetermined shape portion on which the contour line of the body portion is located is provided on the circle B. That is, in this example, only the center in the width direction of the front wall 12 and the center in the width direction of the back wall 13 are predetermined shape portions. The body portion 11a has a shape in which the contour line in the cross section is located outside the virtual circle B except for the predetermined shape portion. That is, the contour line of the body portion 11a (the contour line forming the outer surface of the body portion 11a) is not located inside the virtual circle B. Further, in the cross section of the body portion 11a, the predetermined shape portion is located on the outermost side in the front-rear direction. In other words, the portion of the body portion 11 other than the predetermined shape portion has a shape that is not arranged outside the predetermined shape portion in the front-rear direction. In this example, the shoulder portion 11b, the bottom portion 11c, and the body portion 11a as a whole have a shape in which the contour line is not located inside the virtual circle B in the cross section, but the shoulder portion 11b and the bottom portion 11c The cross section of the above does not have to satisfy the above conditions. That is, at least only the body portion 11a needs to have a shape in which the contour line of the body portion 11a is not located inside the virtual circle B in the cross section.

As described above, in the container 1 of the present embodiment, the flat portion 15 is provided at a position adjacent to the bent portion 14 on the front wall 12 and the back wall 13, and the flat portion 15 is the front wall 12 and the back surface. It is more easily deformed than the curved portion 16 at the center of the wall 13.

As a result, when the contents are heat-filled in the container 1 and then depressurized by cooling, the flat portion 15 is deformed toward the inside of the container 1 before the curved portion 16, and the curved portion 16 is deformed. Is less likely to occur. Therefore, it is possible to prevent non-uniform irregular deformation of the body portion 11a, and it is possible to suppress deterioration of appearance and deterioration of strength.

Further, in this example, the body portion 11a has a shape that is symmetrical in the front-rear direction and symmetrically in the left-right direction. As a result, the front-rear, left-right balance of the body portion 11a becomes even, so that uneven deformation of the body portion 11a can be prevented more reliably. The body portion 11a may have an asymmetrical shape in the front-rear direction and the left-right direction.

Further, since the body portion 11a is symmetrical in the front-rear direction, when either one of the front wall 12 and the back wall 13 of the body portion 11a is inverted and deformed toward the other, between the front wall 12 and the inner surface of the back wall 13. It becomes difficult for a gap to occur. Therefore, the amount of contents remaining in the accommodation space S can be reduced.

The container 1 is formed into a thin wall that can be crushed (squeeze). The container 1 may or may not be restored after the pressing force is released. The container 1 can be obtained, for example, by extrusion blow molding using a tubular parison formed of an olefin-based synthetic resin such as PP or PE (LDPE). In this example, a pinch-off portion 17 formed by cutting off the blow-molded split die is provided on the bottom portion 11c to be closed. The manufacturing method of the container 1 is not limited to this, and various methods can be adopted.

Here, the results of measuring the wall thickness of each part of the container 1 of this example actually formed by extrusion blow molding are shown below. The measurement points were measured from the lower end of the container 1 to a position of 165 mm at 10 mm intervals in the axial direction (see FIG. 3), and measurements were made at 6 points P1 to P6 in the circumferential direction in each cross section (see FIG. 4). Note that P2 and P5 are located at the curved portion 16, and P1, P3, P4 and P6 are located at the flat portion 15.

Further, the measured total length of the container 1 in the axial direction is 190 mm, the length of the body portion 11a in the axial direction is 170 mm, and the distance from the lower end of the container 1 is in the range of 50 mm to 140 mm. .. The body portion 11a has a thickness T of 44 mm and a width W of 67 mm.

As shown in Table 1, the wall thickness is formed thinner at the position of the flat portion 15 than the wall thickness at the center of the curved portion 16. As a result, the flat portion 15 is deformed before the curved portion 16 during cooling after heat filling, so that uneven irregular deformation is less likely to occur.

In the container 1 of this example, the rigidity of the body portion 11a was measured. The measurement conditions are a round bar of φ15 mm, at a position where the distance from the lower end of the container 1 is 100 mm, and the points P2 and P5 shown in FIG. 4 are pushed in from both sides toward the central axis O, and a predetermined displacement occurs. This was done by measuring the force at the time. The speed at which the front and rear round bars were pushed into the body portion 11a was set to 13 mm / min. The average value of the force (measured at n = 5) when the body portion 11a was displaced by 10 mm in the thickness direction was 4.79 N (0.49 kgf).

In the container 1 of this example, by locating the contour line of the body portion 11a outside the virtual circle B, a sudden shape change of the body portion 11a in the pressing (squeeze) direction of the container 1 is suppressed. There is. Therefore, the shape of the body portion 11a is less likely to be a resistance to the squeeze, and the pressing force required for the squeeze is reduced.

When the contents stored in the storage space S of the container 1 are discharged from the tip opening 10b of the mouth portion 10, the front wall 12 and the back wall 13 of the body portion 11a are sandwiched between fingers and squeezed in the thickness direction. The contents can be easily discharged by going.

In particular, in this example, by providing the bent portions 14 at the boundary between the front wall 12 and the back wall 13 on both the left and right sides of the container 1, the ends of the body portion 11a on both sides in the width direction can be folded at an acute angle. As a result, the container 1 can be crushed without a gap so that the inner surface of the front wall 12 and the inner surface of the back wall 13 are in close contact with each other, so that the amount of contents remaining in the accommodation space S can be reduced. In particular, the higher the viscosity of the contained contents, the easier it is to stay inside the container and it becomes difficult to use up the contents until the end. Therefore, the container 1 of the present embodiment is more effective when used for the highly viscous contents. Is.

Here, as shown in FIG. 1, the container 1 of the present embodiment has a contour of the bottom portion 11c that closes the body portion 11a when viewed from the front view from the extending direction (thickness direction) of the short axis of the body portion 11a. The line has a substantially semicircular shape with the maximum width W of the body portion 11a as the diameter. With such a configuration, when the bottom portion 11c to be closed is crushed in the thickness direction, it can be more smoothly inverted and deformed, and it becomes easier to maintain the inverted deformed shape. As a result, the amount of contents remaining in the accommodation space S can be reduced.

Further, as shown in FIG. 4, the internal angle θ of the bent portion 14 is preferably 90 ° or more and 120 ° or less. With such a configuration, it is possible to appropriately secure the volume of the accommodation space S while enhancing the effect of preventing the body portion 11a from being deformed illegally. Further, when the internal angle θ of the bent portion 14 is within the above range, the body portion 11a can be easily squeezed and inverted and deformed, and the inverted deformed shape can be easily maintained. As a result, the effect of the present invention of reducing the amount of contents remaining in the accommodation space S can be enhanced. Further, the internal angle θ of the bent portion 14 is more preferably an acute angle (less than 90 °), and in this case, the effect of preventing irregular deformation of the body portion 11a is further enhanced.

Further, the flatness of the body portion 11a is preferably 0.15 or more and 0.65 or less. With such a configuration, the effect of preventing unauthorized deformation of the body portion 11a can be enhanced. Here, the flatness of the body portion 11a is a value indicated by the ratio of the maximum width W of the body portion 11a to the maximum thickness T of the body portion 11a, that is, the flatness = (WT) / T. This is the value obtained from. In this example, the maximum thickness T of the body portion 11a is 44 mm, the maximum width W of the body portion 11a is 67 mm, and the flatness is 0.34.

The above is merely an embodiment of the present invention, and various modifications can be made within the scope of the claims. For example, the container 1 may have a single layer or a laminated structure. It is also possible to print and decorate labels.

1: Synthetic resin flat container 10: Mouth 10a: Male screw 10b: Tip opening 11a: Body 11b: Shoulder 11c: Bottom 12: Front wall 13: Back wall 14: Bending 15: Flat 16: Curve 17 : Pinch-off part P1 to P6: Measurement point O: Central axis S: Accommodation space T: Body thickness W: Body width

Claims (3)

A composition comprising a tubular mouth portion, a shoulder portion connected to the mouth portion, a body portion connected to the shoulder portion, and a bottom portion connected to the body portion and closed, and squeezing the body portion to discharge the contents. It is a flat resin container
The body has a flat shape in which the width in the left-right direction is larger than the thickness in the front-rear direction.
The body portion includes front wall and back wall arranged to face each other in the thickness direction of the body portion, and bent portions on both left and right sides that form a boundary between the front wall and the back wall at both ends in the width direction of the body portion. And with
The body portion has a center located on the center axis of the body portion in a cross section perpendicular to the direction along the center axis of the body portion, and the center in the width direction of the front wall and the center in the width direction of the back wall. On the virtual circle that passes through, there is a predetermined shape portion where the contour line of the body portion is located, and the portion other than the predetermined shape portion has a shape that is located outside the virtual circle.
A pair of front and rear flat portions having a linear contour line in the cross section are provided adjacent to the bent portions on both the left and right sides on at least a part of the front wall and the back wall , and the left and right said. A curved portion having an arcuate contour line is provided in the central portion of the flat portion.
The flat portion is a flat container made of synthetic resin, which is more easily deformed than the curved portion. The synthetic resin flat container according to claim 1, wherein the body portion is symmetrical in the front-rear direction and symmetrically in the left-right direction. In the cross section
The flat container made of synthetic resin according to claim 1, wherein the internal angle of the bent portion is 90 ° or more and 120 ° or less.

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