JP2011073756A - Synthetic resin container provided with inverting, foldback bottom wall - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a synthetic resin container provided with an inverting, foldback bottom wall that has high rigidity (especially, buckling strength), can maintain a stable, self-supporting position, and can discharge the whole content without requiring a troublesome operation. <P>SOLUTION: The synthetic resin container is provided with a bottom wall 1 that forms the bottom of the container, and a drum section 2 that is united to the perimeter of the bottom wall 1 and forms a filling space M for contents on the inside, wherein a self-supporting base 11 is formed by inverting and folding back the bottom wall 1 toward the inside of the drum section 2, and making the lower peripheral wall of the drum section 2 and the outer wall part of the bottom wall touch or approach each other. In the synthetic resin container, a bending groove 4 is provided in the boundary between the drum section 2 and the bottom wall 1, wherein when the bottom wall is inverted and folded back, the bent groove projects outward, and defines an annular hollow portion inside the projection. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a synthetic resin container that is formed by blow molding or injection molding and that forms a self-supporting leg portion by turning over and turning the bottom wall toward the inside of the body, and in particular, the self-standing container. It aims to stabilize posture and improve strength.

  Many synthetic resin containers that contain shampoos, rinses, detergents, deodorants, cosmetics, etc., are equipped with a discharge device such as a pump to enable the appropriate amount of contents to be removed. After using up the contents, it has become common to transfer the new contents from a refill container that is sold separately and reuse the original container (the container to be refilled). Thus, effective utilization of resources is achieved (see, for example, Patent Document 1).

  By the way, in a conventional container equipped with a discharger such as a pump, it is difficult to take out the contents with the discharger. Therefore, the suction pipe connected to the suction port of the pump is bent from the middle, and its lower end Is placed on the edge of the bottom wall corresponding to the connection portion with the lower end of the body portion of the container, and the contents remaining in the container are collected and discharged at the site by tilting the container. (For example, refer to Patent Document 2) However, the operation of discharging the contents while tilting the container is troublesome for the user, and is not easy to use.

JP 2000-159249 A

JP-A-8-230961

  The object of the present invention is to provide a composite with a reversing and folded bottom wall that has a high rigidity (especially buckling strength) and can ensure a stable self-supporting posture and can reduce the remaining amount of contents as much as possible. A plastic container is being proposed.

The present invention includes a bottom wall that forms a bottom portion of a container, and a body portion that is integrally connected to an outer peripheral edge of the bottom wall and that forms a filling space for contents therein, and the bottom wall is the body portion. A synthetic resin container that forms a self-supporting leg by reversing and folding back toward the inside to bring the lower peripheral wall of the body portion and the outer wall portion of the bottom wall into contact with or close to each other,
At the boundary between the bottom wall and the trunk, which is the starting point of the reversal of the bottom wall, there is a bent groove that protrudes outward at the time of reversal and folding of the bottom wall and forms an annular hollow portion inside thereof. It is a synthetic resin container provided with an inverted and folded bottom wall characterized by being provided. As the bending groove, one having a U-shaped or U-shaped cross section is applied.

  In the synthetic resin container having the above-described structure, it is preferable that a constricted portion (a neck portion) that protrudes toward the inside of the trunk portion is formed on the lower peripheral wall of the trunk portion, The bottom wall has an annular rib (a shape that protrudes toward the inside of the body portion) that contacts the inner surface of the lower peripheral wall of the constricted portion when the bottom wall is inverted and turned and forms a seal portion therebetween. It is preferable to provide the following.

  Moreover, it is desirable that the hollow portion has a diameter larger than the diameter of the body portion, thereby stabilizing the self-standing posture of the container.

  The bottom wall of the container can be constituted by an inclined wall that has the highest edge and forms a liquid reservoir in the center, and has a convex shape on the bottom surface located outside the container, while the inside of the container A plurality of ribs can be provided in which the upper surface located at the bottom is concave, and directed toward the liquid reservoir of the bottom wall.

  As for the self-supporting leg portion, it is particularly desirable to have a cross-sectional shape with a square shape with the diameter gradually increased from the base (base) of the container toward the ground contact end. Further, the angle formed between the lower peripheral wall of the body and the horizontal plane and the angle formed with the horizontal plane of the outer wall of the bottom wall are opposite to each other before the bottom wall is reversed and turned back, and the same An angle should be used.

  An annular bent groove that protrudes outward at the boundary with the body portion, which is the starting point when the bottom wall is inverted and folded, and forms an annular hollow portion inside the convex portion. If it is provided, there is no need to change the wall thickness between the body part and the bottom part in order to enable reversal and folding, so that there is no variation in the wall thickness at the boundary part. This improves the buckling strength of the container and avoids deformation at the shoulder of the container.

  The lower peripheral wall of the body is provided with a constriction that protrudes toward the inside of the body over the entire circumference, and the bottom wall contacts the inner peripheral wall of the constriction when the bottom wall is inverted and turned. By providing an inwardly projecting annular rib that forms a seal portion between the two, the self-supporting leg portion has a double structure, and the strength of that portion can be increased even if the entire container is thin . In addition, since the contents do not enter the gap formed between the lower peripheral wall of the trunk and the outer wall of the bottom wall by the seal portion formed by the annular rib, the appearance may be impaired. Absent.

  By setting the hollow portion to a diameter larger than the diameter of the body portion, the self-standing posture of the container is stabilized.

  The bottom wall is composed of an inclined wall having the highest edge and forming a liquid reservoir at the central portion, and a plurality of ribs directed toward the liquid reservoir of the bottom wall are provided. The entire amount of the contents can be discharged without the need to bend the suction pipe (a straight pipe can be applied), which improves usability. When the rib is formed in a convex shape on the lower surface located outside the container, and the concave shape is applied on the upper surface located inside the container, the contents can efficiently flow down to the liquid reservoir. In addition, since the strength of the bottom wall increases, the bottom wall does not deform due to the weight of the contents.

  Cushioning is improved by configuring the self-supporting leg with a circular frustoconical annular wall whose diameter gradually increases from the base (base) of the container toward the grounding end, and its cross-sectional shape is a square shape. The force applied from above (the force applied when the pressing head is pushed in) is reduced, and as a result, deformation of the shoulder portion of the container can be suppressed.

  The angle formed between the lower peripheral wall of the body portion and the horizontal plane and the angle formed between the outer wall portion of the bottom wall and the horizontal plane are opposite to each other before the bottom wall is turned over and turned back to the same angle, By making the angle at which a gentle slope is formed, it is easy to reverse and turn back, and it is possible to form a self-supporting leg that firmly adheres the lower peripheral wall of the trunk and the outer wall of the bottom wall. It becomes.

It is the figure which showed embodiment of the synthetic resin containers according to this invention. It is an external appearance perspective view of the bottom part of the synthetic resin containers shown in FIG. It is the figure which showed the use condition of the synthetic resin container shown in FIG. It is the figure which showed other embodiment of the synthetic resin containers according to this invention in use condition. It is an external appearance perspective view of the bottom part of the synthetic resin containers shown in FIG.

Hereinafter, the present invention will be described more specifically with reference to the drawings.
FIG. 1 is a diagram schematically showing the form of a container having a reversing and folding bottom according to the present invention, and FIG. 2 is an external perspective view of the bottom wall of the container shown in FIG. 1 before reversing and folding. FIG. 3 is a view showing a state in which the bottom wall of the container is inverted and folded and a discharger such as a pump is attached. Here, as a container suitable for the present invention, a general synthetic resin used for manufacturing a container is used, and the container is molded into a desired shape by blow molding or injection molding.

  1-3 in FIG. 1-3 is a bottom wall which has the circular planar shape which forms the bottom part of a container. The bottom wall 1 is formed of an inclined wall whose upper edge is the highest and lower at the center after being inverted and folded back to the upper inner side, that is, the inner side of the body portion. A recess for forming the portion 1a is provided (see FIG. 3).

  Reference numeral 2 denotes a cylindrical body that rises from the outer peripheral edge of the bottom wall 1 and forms a filling space M for the contents inside thereof. The body 2 is integrally connected to the bottom wall 1. Reference numeral 3 denotes a mouth-and-neck portion that is provided integrally with the top of the body portion 2 and forms a passage that leads to the filling space M. The mouth-and-neck portion 3 is formed of a cylindrical body, and has an outer peripheral wall having a screw portion 3a for mounting a discharger such as a pump (the discharger can be attached and detached by engagement by undercut). It may be one that can be fixed to).

  Reference numeral 4 denotes a bent groove provided at the boundary between the bottom wall 1 and the body 2. The bent groove 4 is a groove that becomes a starting point of the inversion and folding of the bottom wall 1 and has a cross-sectional shape that protrudes outward from the container when the bottom wall 1 is reversed and folded as shown in FIG. Specifically, a U-shaped or U-shaped cross-sectional shape is applied.

  Reference numeral 5 denotes a “constricted portion (a neck portion)” provided on the lower peripheral wall of the trunk portion 2. The constricted portion 5 includes an upper peripheral wall 5a whose diameter gradually increases upward and a lower peripheral wall 5b whose diameter gradually increases downward connected to the lower end of the upper peripheral wall 5a, and is formed over the entire circumference of the body portion 2. It has a “<”-shaped cross section that is convex toward the inside of the portion 2.

  Reference numeral 6 denotes an annular rib which is provided substantially in the middle of the bottom wall 1 in the radial direction and protrudes inward (inner side of the body). The annular rib 6 divides the bottom wall 1 into an inner wall portion 1b and an outer wall portion 1c, and serves as a starting point for maintaining the shape of the bottom wall 1 when the bottom wall 1 is reversed and folded. After the wall 1 is reversed and turned, the inner surface of the lower peripheral wall 5b of the constricted portion 5 is brought into contact with each other to form a seal portion therebetween.

Reference numeral 7 denotes a priming type discharger attached to the mouth / neck portion 3 of the container. The discharge device 7 includes a cylinder 7a that is suspended and held in the upper portion of the filling space M through the mouth / neck portion 3 of the container, a base cap 7b that fixes and holds the cylinder 7a to the mouth / neck portion 3 of the container, and a reciprocating motion in the cylinder 7a. A hollow piston 7c that is movably disposed, a hollow stem 7d that is integrally connected to the upper portion of the piston 7c and that has a check valve in its inner passage, and a poppet (valve) 7e that is disposed inside the cylinder 7a , comprising a tubular body connected to an upper portion of the hollow stem 7d, is composed from the base portion 7f ₂ for holding the operating portion 7f ₁ of the pressing head 7f (operating portion 7f ₁ Toko to drive the piston 7c through the hollow stem 7d And a spring which is arranged in the cylinder 7a and urges (elastically supports) the pressing head 7f upward together with the piston 7c and the hollow stem 7d. 7 g and a valve body (three-point valve or the like) 7 h that is installed at the suction port 7 a _{1 at the} lower end of the cylinder 7 a and opens only when the contents are sucked.

Furthermore, 8 is a suction pipe leading to the suction port 7a ₁ of the cylinder 7a. The suction pipe 8 has a straight shape whose lower end is located in a liquid reservoir 1 a provided at the center of the bottom wall 1. The lower end of the suction pipe 8 has a shape in which a gap is formed with the bottom wall 1 so that the contents can be reliably sucked.

  The synthetic resin container according to the present invention has a shape as shown in FIG. 1 immediately after molding, but when the bottom wall 1 is pressed toward the filling space M of the contents, the bottom wall 1 is As shown in FIG. 3, it is reversed and turned back starting from a bent groove 4 that forms a boundary with the body portion 2, and corresponds to the lower peripheral wall of the body portion 2 (corresponding to the lower peripheral wall 5b of the constricted portion 5). And the outer wall portion 1c of the bottom wall 1 are in contact with each other or in close proximity to each other, whereby a self-supporting leg portion 9 having a truncated cone shape is formed at the lower portion of the container, and at the same time, the bottom wall 1 An annular hollow portion (hollow ring) 10 is formed at the boundary between the body portion 2 and the body portion 2.

  The annular hollow portion 10 is provided corresponding to the ground contact portion located at the lowest end of the self-supporting leg portion 9, and this hollow portion 10 improves the cushioning property of the container and contributes to the improvement of the buckling strength.

  The bending groove 4 can be applied with a U-shaped or U-shaped cross-sectional shape and forms an annular hollow portion 10 having a circular cross section when the bottom wall 1 is reversed and folded. However, the shape of the bent groove 4 is not particularly limited.

As shown in FIG. 3, the hollow portion 10 is preferably set to have a diameter D ₂ (a diameter after inversion and folding) larger than the diameter D ₁ of the body portion 2, thereby stabilizing the self-standing posture of the container. Also, the outer diameter t ₁ of the annular rib 6 provided on the bottom wall 1 and the inner diameter t ₂ of the portion with the smallest diameter of the constricted portion 5 should be substantially the same, thereby the lower peripheral wall of the trunk portion 2. Sealing between (the lower peripheral wall 5b of the constricted portion 5) and the outer wall portion 1c of the bottom wall 1 is ensured, and intrusion of contents is avoided.

  In particular, when the container is made thin, the shape of the bottom wall 1 is deformed due to the weight of the contents, so that the space between the lower peripheral wall of the trunk portion 2 (the lower peripheral wall 5b of the constricted portion 5) and the outer wall portion 1c of the bottom wall 1 is increased. There is a concern that a gap may be formed in the gap, but a reliable seal can be achieved by forming the seal portion with the annular rib 6. Although the annular rib 6 has been shown to have a U-shaped cross-sectional shape, the shape can be variously changed as long as the seal portion can be reliably formed.

To discharge the contents within the container by the dispenser 7 releases the association of the operating portion 7f ₁ and the base portion 7f ₂ in pressing head 7f (FIG. 1 is shown an association state by screws.). Then, the pressing head 7f is pushed upward by the urging force of the spring 7g.

  When the pressing head 7f is pushed up by the spring 7g, the piston 7c and the hollow stem 7d are also pushed upward together with the pressing head 7f. As a result, the inside of the cylinder 7a becomes negative pressure, and the contents in the filling space M are transferred to the suction pipe. 8 is sucked into the cylinder 7a.

When the pressing head 7f is pushed in this state, the inside of the cylinder 7a is pressurized and compressed, and when the predetermined pressure is reached, the pressurized and compressed contents are formed between the piston 7c and the poppet 7e. It will be discharged to the outside from the nozzle portion 7f ₃ of the pressing head 7f through the internal passage of the gap and the hollow stem 7d, the pressing of the pressing head 7f, of the contents by repeating several times the return operation by the spring 7g Continuous discharge is possible.

  Since the synthetic resin container according to the present invention has the liquid reservoir portion 1a in the center portion of the bottom wall 1, it flows toward the center portion of the bottom wall 1 regardless of the amount of the content filled. The discharger 7 can discharge almost the entire amount of contents, and is very convenient.

  4 and 5 are views showing another embodiment of the synthetic resin container according to the present invention. The synthetic resin container shown here is an example in which four ribs 11 are provided on the bottom wall 1 at intervals of 90 ° from the edge to the liquid reservoir 1a. The rib 11 has a convex shape on the bottom surface of the bottom wall 1 and a concave shape on the top surface. By providing the rib 11 on the bottom wall 4, the rigidity of the bottom wall 1 is increased, and the shape is based on the weight of the contents. It becomes possible to prevent deformation. In addition, since the concave portion of the rib 11 functions as a groove portion, the contents in the container efficiently flow into the liquid reservoir 1a along the concave shape, particularly when the remaining amount of the contents is small. Efficient collection of goods is possible.

  The discharger mounted in the present invention is shown for the case of applying a priming type that moves the pressing head up and down, but it is also possible to apply a trigger-type discharger, etc. There is no particular limitation.

  A gentle inclination is formed with respect to the angle (inclination angle) of the lower peripheral wall of the body part 2 (corresponding to the lower peripheral wall 5b of the constricted part 5) and the outer wall part 1c of the bottom wall 1 before reversing and turning back. The bottom wall 1 can be easily reversed and folded. Further, the angle of the constricted portion 5 with respect to the horizontal plane of the lower peripheral wall 5b and the angle of the outer wall portion 1c of the bottom wall 1 are opposite to each other and are equal to each other. The peripheral wall 5b and the outer wall part 1c of the bottom wall 1 can be firmly adhered.

  Easy to use reversal, which has high rigidity (especially buckling strength), can ensure a stable independence posture, and can take out all the contents without troublesome movements, A synthetic resin container having a folded bottom wall can be provided.

DESCRIPTION OF SYMBOLS 1 Bottom wall 1a Liquid reservoir part 1b Inner side wall part 1c Outer side wall part 2 Trunk part 3 Port neck part 3a Screw part 4 Bending groove 5 Constriction part 5a Upper peripheral wall 5b Lower peripheral wall 6 Annular rib 7 Discharger 7a Cylinder 7b Base cap 7c Piston 7d Hollow stem 7e Poppet 7f Press head 7g Spring 7h Valve body 8 Suction pipe 9 Free standing leg 10 Annular hollow 11 Rib M Filling space

Claims (6)

A bottom wall that forms the bottom of the container, and a body that is integrally connected to the outer peripheral edge of the bottom wall and that forms a filling space for the contents inside the container, the bottom wall facing the inside of the body A synthetic resin container that forms a self-supporting leg by bringing the lower peripheral wall of the trunk part and the outer wall part of the bottom wall into contact with or in close proximity to each other,
A bent groove that protrudes outward when the bottom wall is reversed and folded and forms an annular hollow portion at the boundary with the body portion that is the starting point of the reversed and folded bottom wall. A synthetic resin container having an inverted and folded bottom wall characterized by being provided.   The lower peripheral wall of the body portion has a constricted portion that protrudes toward the inside of the body portion over the entire circumference, and the bottom wall has a lower peripheral wall of the constricted portion when the bottom wall is reversed and turned. 2. The synthetic resin container having an inverted and folded bottom wall according to claim 1, further comprising an inwardly projecting annular rib that contacts the inner surface and forms a seal portion therebetween.   The said hollow part is a synthetic resin container provided with the inversion and the folding | turning bottom wall of Claim 1 or 2 which has a diameter larger than the diameter of a trunk | drum.   The bottom wall is an inclined wall that has the highest edge and forms a liquid reservoir in the center, and has a convex shape on the bottom surface located outside the container, while having a concave shape on the top surface located inside the container. The synthetic resin container provided with the inverted and folded bottom wall according to any one of claims 1 to 3, which has a plurality of ribs directed toward a liquid reservoir portion of the bottom wall.   The synthetic | combination provided with the inversion and the folding | turning bottom wall in any one of Claims 1-4 in which the said self-supporting leg part has the cross-sectional shape of the cross-section which gradually increased the diameter toward the grounding end from the base part of the container. Resin container.   The angle formed between the lower peripheral wall of the trunk portion and the horizontal plane and the angle formed between the outer wall portion of the bottom wall and the horizontal plane are opposite to each other before the bottom wall is turned over and turned back, and are equal. A synthetic resin container provided with the inverted and folded bottom wall according to claim 1.

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