JP2019081559A - Flat container of synthetic resin - Google Patents

Abstract

To provide a flat container of synthetic resin that can be prevented from being improperly deformed when contents are hot-filled into the container in a flat shape.SOLUTION: In a flat container 1 of synthetic resin that discharges contents by squeezing a trunk part 11a, the trunk part 11a is formed in a flat shape in which a width W is larger than a thickness T. The trunk part 11a comprises a front side wall 12 and a back side wall 13 oppositely arranged in a thickness direction, and bent parts 14 at both left and right sides constituting a boundary between the front side wall 12 and the back side wall 13, at both end parts in a width direction of the trunk part 11a. In a cross section perpendicular to a shaft line of the trunk part 11a, the trunk part has a prescribed shape part in which a center is positioned on a center shaft line O of the trunk part 11a and a contour line of the trunk part 11a is positioned on a virtual circle B passing through a center in a width direction of the front side wall 12 and a center in the width direction of the back side wall 13, where parts other than the prescribed shape part are formed so as to be positioned outside the virtual circle B. In at least parts of the front side wall 12 and the back side wall 13, flat parts 15 whose contour lines in the cross section are linear are arranged adjacently to the bent parts 14 respectively at both left and right sides, respectively.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a synthetic resin flat container including a cylindrical opening and a flat trunk connected to the opening and squeezing the trunk to discharge the contents.

  Conventionally, as a container for containing various contents such as food and cosmetics, it is made of a synthetic resin provided with a cylindrical opening and a body which is continuous with the opening to form an accommodation space for the contents. The container of is known (for example, refer to patent documents 1).

  Further, for example, as a flat container made of a synthetic resin used for contents having a relatively high viscosity, there is a form in which the contents contained inside are pushed out by squeezing a flexible body. Among such containers, there is known a container in which the trunk of the container has a flat shape such that the cross section is substantially elliptical in order to facilitate the crushing operation of the trunk. By making the body part flat, it becomes easy to crush the body part from both sides in the thickness direction.

Patent No. 4137523 gazette

  By the way, when the container is filled with the contents, the container is filled with the preheated contents in a high temperature state, and the cap is attached and sealed before the temperature of the contents decreases. There is a way.

  In this heat filling, after the container for containing the heated contents is sealed, a cooling step of cooling to a predetermined temperature is performed, so the inside of the container is decompressed as the temperature of the contents decreases. For this reason, there is a possibility that unintended deformation such as an uneven depression unintended may occur in the body of the container, which may impair the appearance or cause a reduction in 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 improper deformation when the contents are heat-filled in a flat container. The purpose is

The flat container made of synthetic resin according to the present invention comprises a cylindrical opening, a shoulder connected to the opening, a trunk connected to the shoulder, and a bottom connected to the trunk and closing the trunk. A flat container made of synthetic resin that squeezes and discharges the contents,
The body has a flat shape having a width in the left-right direction larger than a thickness in the front-rear direction,
The body is a front wall and a back wall disposed opposite to each other in the thickness direction of the body, and left and right bent portions that form boundaries between the front wall and the back wall at both widthwise ends of the body. And
In a cross section perpendicular to the axial direction of the trunk, the trunk is located on the central axis of the trunk, and is a virtual that passes through the width center of the front wall and the width center of the back wall. On the circle, there is a predetermined shape portion where the outline of the body portion is located, and the portion other than the predetermined shape portion is located outside the virtual circle
Flat portions whose contours in the cross section are linear are provided adjacent to the left and right bent portions on at least a part of the front wall and the rear wall.

  In the flat container made of synthetic resin of the present invention, it is preferable that the body portion be symmetrical in the longitudinal direction and in the lateral direction.

In the flat container made of synthetic resin of the present invention, in the cross section,
It is preferable that the internal angle of the said bending part is 90 degrees or more and 120 degrees or less.

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

It is a front view of a synthetic resin flat container concerning one embodiment of the present invention. It is a top view of the synthetic resin flat container shown in FIG. It is a side view of the synthetic resin flat container shown in FIG. It is sectional drawing which shows the AA cross section in the synthetic resin flat container of FIG.

  Hereinafter, the present invention will be more specifically illustrated and described with reference to the drawings.

  The synthetic resin flat container 1 (hereinafter, also referred to as "container 1") according to this embodiment shown in Figs. 1 to 4 has a cylindrical opening 10, a shoulder 11b connected to the opening 10, and a shoulder 11b. It has a body 11a in series and a bottom 11c in series with the body 11a. The inside of the container 1 is a storage space S of contents. In the present embodiment, the mouth portion 10 is formed in a cylindrical shape, and an external thread 10 a capable of mounting a cap or the like is provided on the outer peripheral surface thereof. Further, the tip end opening 10b of the mouth portion 10 serves as a discharge port of the contents.

  As shown in FIGS. 1 and 3, the body portion 11 a 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 (short axis direction) when discharging the contents. The body portion 11 a is formed in a cylindrical shape extending straight in the axial direction along the central axis O. The body 11a may have a constant cross-sectional shape (horizontal cross-section) perpendicular to the central axis O, or may have a constricted portion in which the outer diameter of the cross-section decreases.

  The shoulder 11b (the upper region of the body 11a in FIG. 1) connected to one side (upper side) in the axial direction along the central axis O of the body 11a is gradually reduced in diameter from the connection to the body 11a. Meanwhile, the tip is connected to the mouth 10. Further, the bottom 11c (the lower area of the body 11a in FIG. 1) connected to the other side (downward) in the axial direction of the body 11a gradually reduces in diameter toward the end and is closed at the end . The bottom portion 11 c has a curved shape that bulges downward as a whole. As described above, in the container 1 of the present embodiment, the entire closed bottom portion 11 c has a curved shape that bulges downward, so that the bottom portion is compared with the container closed by the bottom wall perpendicular to the central axis O. Thus, it is easy to crush the body 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 disposed opposite to each other in the thickness direction across the central axis O. In addition, the body portion 11a has left and right bent portions 14 that form the boundary between the front wall 12 and the back wall 13 at both widthwise end portions of the body portion 11a. The bending portion 14 extends in parallel to the axial direction. In this example, the bending portion 14 linearly extends along the parting line PL of the mold. In this example, the bending portion 14 squeezes the body portion 11 a in the thickness direction, and is configured as a starting point when one of the front wall 12 and the back wall 13 is reversely deformed toward the other. In the present example, the front wall 12 and the back wall 13 have a symmetrical shape in the front-rear direction, and the left and right bent portions 14 also have a symmetrical shape. That is, the trunk portion 11a is symmetrical in the front-rear direction and in the left-right symmetry.

  Here, FIG. 4 shows a cross section of the body 11a at the position of the line AA of FIG. As shown in FIG. 4, on the left and right sides of the body portion 11 a, the front wall 12 and the back wall 13 sandwiching the bending portion 14 are provided with a pair of front and rear flat portions 15 whose outer surface contour is linear. There is. The flat portion 15 is provided adjacent to the bending portion 14. The width of the flat portion 15 in this example gradually increases downward from near the boundary between the body portion 11a and the shoulder portion 11b, and the width gradually decreases downward from the maximum width position. In addition, the shape of the flat part 15 is not limited to the example of illustration, For example, width may be fixed along an axial direction. Moreover, the flat part 15 should just be provided in at least one part of the height direction of the trunk | drum 11a. At a central portion between the left and right flat portions 15, a curved portion 16 having an arc-shaped outline is provided.

  Here, as shown in the cross section of FIG. 4, the torso portion 11 a is located on the center axis O of the torso portion 11 a, and is a virtual center passing through the width direction center of the front wall 12 and the width direction center of the back wall 13. On the circle B, it has a predetermined shape portion where the outline of the body portion is located. That is, in the present embodiment, only the center in the width direction of the front wall 12 and the center in the width direction of the rear wall 13 form the predetermined shape. The body portion 11a has a shape in which the contour in the cross section is positioned outside the imaginary circle B in the portions other than the predetermined shape portion. That is, inside the virtual circle B, the outline of the body 11a (the outline forming the outer surface of the body 11a) is not located. Moreover, in the cross section of the trunk | drum 11a, a predetermined-shaped part becomes a structure located in the outermost side in the front-back direction. In other words, the portion of the body portion 11 other than the predetermined shape portion is shaped so as not to be disposed outside the predetermined shape portion in the front-rear direction. In the present example, the entire shoulder 11b, bottom 11c, and body 11a have a shape in which the outline is not located inside the imaginary circle B in the cross section, but the shoulder 11b and the bottom 11c The cross section of may not satisfy the said conditions. That is, it is sufficient that at least only the trunk portion 11a has a shape in which the outline of the trunk portion 11a is not located inside the imaginary circle B in the cross section.

  Thus, in the container 1 of the present embodiment, the flat portion 15 is provided at a position adjacent to the bent portion 14 in the front wall 12 and the back wall 13, and the flat portion 15 corresponds to the front wall 12 and the back surface. It is easier to deform than the central curved portion 16 of the wall 13.

  As a result, after the contents are heat-filled in the container 1, when the pressure is reduced by cooling, the flat portion 15 is deformed toward the inside of the container 1 earlier than the curved portion 16, and the curved portion 16 is deformed. Is less likely to occur. Therefore, it is possible to prevent the occurrence of uneven deformation in the body portion 11a, and to suppress the deterioration of the appearance and the reduction of the strength.

  Further, in the present embodiment, the trunk portion 11a is symmetrical in the front-rear direction and in the left-right symmetry. Thereby, since the balance of the front and rear, right and left of the trunk | drum 11a becomes equal, the non-uniform deformation of the trunk | drum 11a can be prevented more reliably. The body 11a may have an asymmetrical shape in the front-rear direction and the left-right direction.

  In addition, when the body portion 11a is symmetrical in the back and forth direction, when any one of the front wall 12 and the back wall 13 of the body portion 11a is reversely deformed toward the other, the space between the inner surfaces of the front wall 12 and the back wall 13 Gaps are less likely to occur. Therefore, the amount of contents remaining in the accommodation space S can be reduced.

  The container 1 is formed in a thin wall which can be squeezed. Note that the container 1 may or may not be restored after releasing the pressing force. 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 biting off of a blow molding split die is provided at the closed bottom portion 11 c. In addition, the manufacturing method of the container 1 is not limited to this, A various method is employable.

  Here, the result of having measured the thickness of each part of container 1 of this example actually formed by extrusion blow molding is shown below. The measurement points were at positions of 165 mm at 10 mm intervals from the lower end of the container 1 in the axial direction (see FIG. 3), and were measured at six points P1 to P6 circumferentially in each cross section (see FIG. 4). 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 in the axial direction of the container 1 is 190 mm, the length in the axial direction of the body 11a is 170 mm, and the distance from the lower end of the container 1 is 50 mm to 140 mm. . Moreover, the thickness T of the trunk | drum 11a is 44 mm, and the width W is 67 mm.

  As shown in Table 1, compared with the thickness of the center of the curved portion 16, the thickness is formed thinner at the position of the flat portion 15. Thereby, since the flat part 15 deform | transforms earlier than the curved part 16 at the time of cooling after hot filling, it becomes difficult to produce non-uniform | heterogenous irregular deformation.

  In the container 1 of this example, the rigidity of the body 11a was measured. The measurement conditions are: a point of 100 mm from the lower end of the container 1 with a φ15 mm round bar, pushing points P2 and P5 shown in FIG. 4 toward the central axis O from both sides, and a predetermined displacement occurs By measuring the force at the time of In addition, the speed at the time of pushing in each round bar before and behind to the trunk | drum 11a was 13 mm / min. The average value of the force (measured at n = 5) when the body 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 positioning the contour line of the trunk portion 11a outside the imaginary circle B, the rapid shape change of the trunk portion 11a in the pressing (squeeze) direction of the container 1 is suppressed. There is. Therefore, the shape of the trunk portion 11a does not easily resist the squeeze, and the pressing force required at the time of the squeeze decreases.

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

  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 the left and right sides of the container 1, the ends on both sides in the width direction of the trunk 11 a 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 the amount of content remaining in the storage space S can be reduced. In particular, the higher the viscosity of the content to be contained, the easier it is to easily stay inside the container and it is difficult to use up the content to the end, so the container 1 of this embodiment is more effective when used for content with high viscosity. It is.

  Here, as shown in FIG. 1, the container 1 according to the present embodiment has an outline of a bottom 11 c of the trunk 11 a closed in a front view as viewed from the direction of extension of the short axis (thickness direction) of the trunk 11 a. The line has a substantially semicircular shape whose diameter is the maximum width W of the body portion 11a. With such a configuration, when the closed bottom portion 11c is squeezed in the thickness direction, the reverse deformation can be smoothly performed, and the reverse deformed shape can be easily maintained. As a result, the amount of content remaining in the accommodation space S can be reduced.

  Further, as shown in FIG. 4, the internal angle θ of the bending 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 improper deformation of the trunk 11a. Further, when the internal angle θ of the bending portion 14 is in the above range, it becomes easy to squeeze the body portion 11a to perform reverse deformation, and it becomes easy to maintain the reversely deformed shape. As a result, the effect of the present invention for reducing the amount of contents remaining in the accommodation space S can be enhanced. Further, the internal angle θ of the bending portion 14 is more preferably an acute angle (less than 90 °), and in this case, the effect of preventing unauthorized deformation of the trunk portion 11a is further enhanced.

  Moreover, it is preferable that the flatness of the trunk | drum 11a is 0.15 or more and 0.65 or less. With such a configuration, the effect of preventing unauthorized deformation of the body 11a can be enhanced. Here, the flatness of the body 11a is a value represented by the ratio of the maximum width W of the body 11a to the maximum thickness T of the body 11a, that is, flatness = (W-T) / T Is the value obtained by In the present embodiment, the maximum thickness T of the body 11a is 44 mm, the maximum width W of the body 11a is 67 mm, and the flatness is 0.34.

  The foregoing merely shows one embodiment of the present invention, and various modifications can be made within the scope of the claims. For example, the container 1 may be a single layer or a laminated structure. In addition, decoration such as printing and labels is also possible.

1: Flat container made of synthetic resin 10: Mouth 10a: Male thread 10b: Tip opening 11a: Body 11b: Shoulder 11c: Bottom 12: Front wall 13: Back wall 14: Back wall 14: Curved portion 15: Flat portion 16: Curved portion 17 : Pinch-off part P1 to P6: measurement point O: central axis S: accommodation space T: thickness of trunk W: width of trunk

Claims (3)

A composite comprising a cylindrical mouth, a shoulder connected to the mouth, a body connected to the shoulder, and a bottom connected to the body and closing the body, and the contents are discharged by squeezing the body It is a flat container made of resin,
The body has a flat shape having a width in the left-right direction larger than a thickness in the front-rear direction,
The body is a front wall and a back wall disposed opposite to each other in the thickness direction of the body, and left and right bent portions that form boundaries between the front wall and the back wall at both widthwise ends of the body. And
In a cross section perpendicular to the axial direction of the trunk, the trunk is located on the central axis of the trunk, and is a virtual that passes through the width center of the front wall and the width center of the back wall. The circle has a predetermined shape portion on which the outline of the body portion is located, and the portion other than the predetermined shape portion is shaped to be positioned outside the virtual circle,
The flat container made of a synthetic resin is provided on at least a part of the front wall and the back wall such that flat portions whose outlines in the cross section become linear are provided adjacent to the bent portions on both left and right sides.   The synthetic resin flat container according to claim 1, wherein the body portion is symmetrical in the front and rear direction and in the left and right direction. In the cross section,
The synthetic resin flat container according to claim 1, wherein an inner angle of the bent portion is 90 ° or more and 120 ° or less.

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