JP5769052B2 - Synthetic resin container with a handle hole - Google Patents

Description

  The present invention relates to a synthetic resin container produced by a blow molding method, and more particularly to a synthetic resin container having a handle hole in a trunk.

  Conventionally, a synthetic resin container obtained by blow-molding a hollow parison made of synthetic resin such as polypropylene (PP) is known, and at present, synthetic resin containers are becoming mainstream in the market.

  Since such a synthetic resin container is difficult to hold when it becomes large, a container having a handle hole in consideration of convenience for consumers has been developed. For example, the following patent documents exist.

Japanese Patent No. 2696450 Japanese Patent Laid-Open No. 11-277615 JP 2001-179815 A

  However, such a synthetic resin container is formed at a position where the hole for the handle is offset in one of the left and right directions from the center of the container body as described in Patent Documents 1, 2, and 3 above. The configuration is common. For this reason, for example, when holding a synthetic resin container with the right hand, it can be held as it is, but when trying to hold it with the left hand, after the synthetic resin container is rotated 180 degrees, Otherwise, there is an inconvenient aspect that a person who wants to hold a synthetic resin container can only hold it with the left hand after moving to the opposite side of the container body.

  For this reason, recently, in order to improve the convenience of consumers, a grip hole is provided at the center of the body of the synthetic resin container, so that it can be gripped with either the right hand or the left hand. Synthetic resin containers that can be gripped in the same way from either side have also been developed.

  By the way, the hole portion for the handle is formed by removing the portion remaining in the center of the hole portion after the container body is taken out of the blow molding die as described in the above-mentioned Patent Documents 1 and 2, etc. Is done. After removal, the pinch-off part is formed in an annular shape on the hole wall surface of the intermediate part in the depth direction of the hole part, but for example, the impact caused by the water hammer phenomenon that is likely to occur when a synthetic resin container falls. When this occurs, there is a problem that the pinch-off part breaks and the contents leak out from the hole.

  In particular, in a synthetic resin container in which a hole for a handle is provided in the center of the body of the container body, the impact due to the water hammer phenomenon is easily applied directly to the pinch-off part. Liquid leakage due to breakage at the pinch-off portion is likely to occur as compared with a synthetic resin container formed at either one of the left and right positions.

  In order to eliminate the above-described problems in the prior art, the present invention provides a synthetic resin container having a handle hole in the vicinity of the center of the container body, and an annular pinch-off portion formed around the hole. It is an object of the present invention to create a synthetic resin container having a handle hole that can prevent the annular pinch-off portion from being broken by an impact caused by a water hammer phenomenon by increasing the strength.

Of the means for solving the above problems, the main configuration of the present invention is as follows.
A container body having a mouth tube part, a cylindrical body part and a bottom part is a bottomed cylindrical synthetic resin container formed by a blow molding method,
A hole that penetrates between the pair of front and back walls forming the body is provided at a position near the center of the body, and a pinch-off part is formed annularly on the wall of the hole that forms the hole. And
In and on the bottom side of the pinch off portion of the annular position inside of the container body, when characterized by forming the thick portion consisting of and width 2mm~7mm thick dimension than the thickness dimension of the hole wall It is said.

  The hole is formed by removing the excision piece after forming the excision piece by thermally welding the bottom surfaces of the hole part formed by partially forming the front wall and the rear wall of the trunk part during blow molding. At the same time, an annular pinch-off portion is formed on the hole wall surface. The wall surface of the hole portion is thinner than the other portions of the container body, and the strength of the annular pinch-off portion that is thermally welded is also low. For this reason, when the container main body falls in the vertical direction, a large impact is applied to the hole provided in the vicinity of the center of the container main body, which is likely to cause breakage.

  In the above configuration, by reinforcing the lower part (bottom part) side of the annular pinch-off part, which is one of the vertical directions, with a thick part, the strength of the hole part is dramatically increased and it can withstand the impact caused by the water hammer phenomenon. A resin container is provided.

  According to another aspect of the present invention, in the first aspect of the invention, the hole is elliptical and the major axis of the ellipse is arranged along the vertical direction connecting the mouth tube and the bottom. It is.

  In the synthetic resin container having the above-described configuration, the shape of the hole is vertically long and elliptical, so that the impact applied to the hole when the water hammer phenomenon occurs is reduced. The ellipse includes an ellipse.

  According to another aspect of the present invention, in the invention according to claim 1 or 2, the thick portion is formed in the container body and at a position on the mouth tube portion side of the annular pinch-off portion. Is.

  In the synthetic resin container having the above configuration, the upper end side of the hole is reinforced by the thick portion formed on the upper end side of the annular pinch-off portion.

  According to another aspect of the present invention, in the invention according to claim 1 or 2, four or more thick portions are formed at predetermined intervals along the annular pinch-off portion inside the container body. It is said.

  In the synthetic resin container having the above-described configuration, the plurality of thick portions formed at predetermined intervals strongly reinforce the entire hole.

Since the present invention has the above-described configuration, the following effects can be obtained.
In the main configuration of the present invention, in a synthetic resin container having a novel design of providing a hole in the vicinity of the center of the container body, by effectively suppressing breakage of the annular pinch-off part due to the impact of the water hammer phenomenon The liquid leakage from the hole can be prevented.

  In addition, in the configuration in which the hole is elliptical and the major axis of the ellipse is arranged along the vertical direction connecting the mouth tube part and the bottom part, the circular hole or the horizontally long ellipse in the horizontal direction Compared to the hole, the area that receives stress from water can be reduced, so that the impact applied to the hole during the water hammer phenomenon is reduced, and a synthetic resin container that is more resistant to shock can be obtained.

  In addition, in the configuration in which the thick wall portion is also formed on the inner side of the container body and also on the mouth tube part side of the annular pinch-off part, when the mouth tube part side of the container body collides with the ground In addition, in any case where the bottom side collides, it is possible to reliably suppress the breakage of the annular pinch-off part and reliably prevent liquid leakage from the hole part.

  In addition, in the configuration in which four or more thick parts are formed at predetermined intervals along the annular pinch-off part inside the container body, the strength of the annular pinch-off part can be further increased, The container can be made of a synthetic resin that can withstand a large impact and hardly cause liquid leakage from the hole.

It is a front view of the synthetic resin container of the present invention. It is a side view of the synthetic resin container of the present invention. It is a top view of the synthetic resin container of the present invention. It is a cross-sectional view in the IV-IV line shown in FIG. FIG. 4 is an enlarged cross-sectional view taken along line V-V shown in FIG. 1, where A indicates a state immediately before the hole is formed, and B indicates a state after the hole is formed. It is a longitudinal cross-sectional view in the VI-VI line shown in FIG. 1, and is sectional drawing which expands and shows a synthetic resin container partially.

Embodiments of the present invention will be described below with reference to the drawings.
1 is a front view showing a synthetic resin container as an embodiment of the present invention, FIG. 2 is a side view of the synthetic resin container, FIG. 3 is a plan view of the synthetic resin container, and FIG. FIG. 5 is a cross-sectional view taken along line IV, FIG. 5 is an enlarged cross-sectional view taken along line V-V shown in FIG. 1, A is a state immediately before the hole is formed, and B is a state after the hole is formed. ing. FIG. 6 is a longitudinal sectional view taken along the line VI-VI shown in FIG. 1, and is a sectional view showing a partially enlarged synthetic resin container.

  The synthetic resin container shown in FIGS. 1 to 6 is formed by blow molding a parison made of a synthetic resin material such as polypropylene (PP) or polyethylene (PE) in a molding die. In this embodiment, the container main body 1 is provided on the lower portion side of the barrel portion 4 having a pair of front walls 4A and a rear wall 4B and side walls 4C and 4C provided on both sides thereof. The bottom portion 5 is formed in a bottomed cylindrical shape, and the mouth tube portion 2 is integrally provided on the upper portion of the body portion 4. The synthetic resin container is sold in a sealed state in which a cap or a nozzle head (not shown) is attached to the mouth tube portion 2.

  As shown in FIGS. 1 and 2, a concave portion 6 having a substantially elliptical shape is formed in a recessed manner at a position on the upper side (mouth tube portion) side of the body portion 4 forming the container body 1. A hole 7 is formed in the center of the recess 6 so as to pass vertically between the front wall 4A and the back wall 4B. As shown in FIG. 1, the hole 7 is formed in an elliptical shape. More specifically, the hole 7 is formed in a vertically long ellipse shape in which the long diameter side is matched with the vertical direction connecting the mouth tube part 2 and the bottom part 5 and the short diameter side is matched with the horizontal direction.

  The hole 7 is used as a handle for gripping the container main body 1, but may be formed in the vicinity of the center in the lateral width direction of the front wall 4 </ b> A and the back wall 4 </ b> B forming the container main body 1. The front wall 4A and the back wall 4B need not be formed with high accuracy in the center position in the lateral width direction. Further, the height position in the vertical direction is not particularly limited. However, in consideration of ease of gripping and design, a configuration provided at a position above the half of the total height of the container body 1 is preferable.

  Since the hole 7 is formed in the vicinity of the center of the front wall 4A and the back wall 4B of the body 4 that forms the container body 1, the hand of the person who intends to hold the synthetic resin container is either the right hand or the left hand. It doesn't matter if it is. In other words, the right and left hands are equally stable without rotating the posture of the container body 1 180 degrees as in the prior art or without moving to a position where a person who wants to hold the container body 1 can easily hold it. It is possible to grip.

  This synthetic resin container is used as a container for filling contents (commodities) such as liquid detergent, laundry softener, shampoo or rinse. The hole 7 formed in the vicinity of the center of the front wall 4A and the back wall 4B of the body 4 forming the container body 1 makes the design of this synthetic resin container innovative and unique, and improves the purchasing power of products. It plays an important role in making it happen.

  A label region 10 is provided below the front wall 4A. The label area 10 is provided with, for example, a seal-like label printed with various product information such as a product name, application, component, manufacturer, or in-mold label. The configuration on the back wall 4B side is the same as that of the front wall 4A.

  As shown in FIGS. 2 to 6, a pinch-off portion 8 </ b> B having an annular shape (in the present embodiment, an ellipse shape) is formed on a hole wall surface 7 </ b> A forming the hole portion 7 at an intermediate portion in the depth direction of the hole portion 7. Is formed. The pinch-off portion 8B is formed at the same time as the hole 7 when the parison is blow-molded in a molding die composed of a pair of split molds having a top die (nesting).

  That is, the parison is blown and stretched in a molding die (not shown) to form the container body 1. At this time, as shown in FIG. 5A, one piece die (nesting) 11 and the other piece The top and bottom molds (nestings) 12 form recesses 6 and 6 on the front wall 4A and the back wall 4B of the container body 1, and thin-walled hole wall surfaces 7A and 7A following the recesses 6 and 6, respectively. . The bottom surface of one hole 7 and the bottom surface of the other hole 7 are firmly sandwiched between one piece mold (nesting piece) 11 and the other piece die (nesting piece) 12. In this state, the cut pieces 8A are formed by heat fusion with each other. After blow molding, the cut piece 8A is removed along the cutting line C, whereby the hole 7 is formed through. At the same time, an annular pinch-off portion 8B is formed at the boundary between the hole wall surface 7A of the front wall 4A and the hole wall surface 7A of the back wall 4B.

  As shown in FIG. 5A, FIG. 5B, etc., in the present invention, the thick portion 9a is at least the inner side of the container body 1 (the side filled with the inner solution) and the vertical of the pinch-off portion 8B formed in an annular shape. It is formed at a position on the lower side (bottom side) of the direction. The thick wall portion 9a is formed with a thickness that is thicker than the wall thickness that forms the synthetic resin container, particularly with a thickness that is thicker than the wall thickness of the hole wall surface 7A that is formed with a thin wall. It is reinforced.

  That is, the thick wall portion 9a has a function of increasing the strength of the annular pinch-off portion 8B, and is a boundary between the hole wall surface 7A on the front wall 4A side and the hole wall surface 7A on the back wall 4B side that are heat-sealed to each other. Suppresses breakage of parts. For this reason, even if the synthetic resin container falls with the bottom 5 side facing the ground or the like, and the impact due to the water hammer phenomenon is applied to the hole 7, the thick wall provided on the lower end side on the vertical line The portion 9a effectively suppresses the breakage of the annular pinch-off portion 8B, and it is possible to reliably prevent the internal solution from leaking outside from this portion. Thereby, the fall of the commercial value of the synthetic resin container provided with the hole for grips in the center vicinity of the front wall 4A and the back wall 4B which form the trunk | drum 4 can be suppressed. In addition, the preferable width dimension of the thick part 9a is 2 mm-7 mm.

  Further, as shown by a broken line in FIG. 6, the thick portion 9b is also located at a position on the inner side of the container body 1 and the upper side (mouth tube portion side) in the vertical direction of the pinch-off portion 8B formed in an annular shape. It is preferable to provide the provided configuration. In this configuration, the upper end side of the annular pinch-off portion 8B can be prevented from being broken, and the upper end and the lower end in the vertical direction of the hole portion 7 can be reinforced. It can be set as the synthetic resin container which is hard to leak.

  As mentioned above, although the structure of this invention and its effect were demonstrated along the Example, embodiment of this invention is not limited to the said Example.

For example, in the above-described embodiment, the structure in which the thick portion is formed at the lower end and the upper end of the annular pinch-off portion 8B has been described. However, the present invention is not limited to this, and the upper, lower, left, and right four locations It may be configured to be formed at a position, or may be configured to intermittently form four or more thick portions along the annular pinch-off portion 8B at a predetermined interval . With the configuration like this, it is possible to further enhance the overall strength of the pinch off portion 8B made of cyclic, it becomes possible to place hard synthetic resin container of liquid leakage withstand a greater impact.

  In the above embodiment, polypropylene (PP) and polyethylene (PE) are shown and described as materials for the synthetic resin container. However, the material is not limited to these. For example, polystyrene (PS) or polyethylene terephthalate (PET). Other synthetic resin materials may be used. These synthetic resins may have a single layer structure or a laminated structure.

  The synthetic resin container having a handle hole portion of the present invention has a hole portion provided near the center of the trunk portion to improve the design of the container body and suppress the breakage of the hole portion due to an impact caused by a water hammer phenomenon. Thus, the application development in the field of synthetic resin containers which is intended to prevent the reduction of the commercial value can be achieved in a wider area.

DESCRIPTION OF SYMBOLS 1; Container body 2; Mouth part 4; Trunk part 4A; Front wall 4B; Back wall 4C; Side wall 5; Bottom part 6; Recessed part 7: Hole part 7A: Hole wall surface 8A; ; Thick part 9b; thick part 10; label region 11; piece mold (nesting)
12: Top die (nesting)

Claims (4)

A container body (1) having a mouth tube part (2), a cylindrical body part (4) and a bottom part (5) is a bottomed cylindrical synthetic resin container formed by a blow molding method,
A hole (7) penetrating between a pair of front wall (4A) and back wall (4B) forming the body (4) is provided at a position near the center of the body (4), A pinch-off portion (8B) is formed in an annular shape on the hole wall surface (7A) forming the hole (7),
Wherein the bottom (5) of the side position, and the width of a thick dimension than the thickness dimension of the hole wall surface (7A) of and said annular pinch-off portion at the inner side (8B) before SL container body (1) A synthetic resin container provided with a hole for a handle, wherein a thick part (9a) of 2 mm to 7 mm is formed.   The hole for a handle according to claim 1, wherein the hole (7) has an elliptical shape, and the major axis of the ellipse is arranged along a vertical direction connecting the mouth tube (2) and the bottom (5). A synthetic resin container.   The handle for a handle according to claim 1 or 2, wherein the thick part (9b) is also formed in the container body (1) and at a position of the annular pinch-off part (8B) on the side of the mouth tube part (2). A synthetic resin container having a hole.   The handle hole according to claim 1 or 2, wherein the four or more thick portions are formed at predetermined intervals along the annular pinch-off portion (8B) inside the container body (1). Synthetic resin container.

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