JP6172514B2 - Synthetic resin cup-shaped container - Google Patents

Description

  The present invention relates to a container for filling and storing semi-solid contents such as pudding, konnyaku, and agar. More specifically, the present invention can open an intake hole for taking out the contents stored and stored in the bottom part of the container. The present invention relates to an injection-molded synthetic resin cup-shaped container.

  2. Description of the Related Art Conventionally, a cup-shaped container is known as a semi-solid content filling container such as pudding, konnyaku, agar, etc., which is configured to be able to open an intake hole for taking out the filled contents in the bottom part of the container. .

  As shown in Patent Document 1 (Japanese Patent Laid-Open No. 2007-269358), a typical prior art configuration of this type of container is one in which a protrusion is integrally provided on the bottom plate of the container. When taking out, push the protrusion forcibly with the container upside down, and open the intake hole in the bottom plate by pushing down the protrusion to prevent the generation of vacuum between the container and the contents. It is possible to smoothly achieve the drop removal from inside the container.

  However, in the above-described prior art, there is a case where the action of “easy to break” by the weld line may not be stably exhibited, and in this case, it is difficult to break, and the break opening cannot be performed. is there. In this case, the protrusion is forcibly pushed down to open the fracture, but a large force is required to push down the protrusion, which causes an unpleasant irritation to the fingertip that pushes down the protrusion. It was.

  In addition, if the thickness of the thin region formed so as to surround the protrusion is sufficiently reduced to facilitate breakage, the fluidity of the molten resin with respect to the thin region is reduced, and thereby formability due to short shots, etc. In particular, there is a problem that there may be a case where a defect, particularly a moldability of the protruding portion, may occur.

JP 2007-269358 A

  Therefore, the present invention was devised to solve the above-described problems in the prior art, and is a technique for enabling the protrusions to be pushed down while being stably supported at a thick and constant location. An object of the present invention is to make it possible to stably push down the protrusion and to obtain a good moldability of the protrusion.

The main configuration of the present invention for solving the above technical problem is:
A cup-shaped container that is a synthetic resin injection-molded product having a barrel, a bottom plate that closes the lower end of the barrel, and leg pieces that are suspended from the peripheral edge of the lower surface of the bottom plate;
The bottom plate has a gate mark, and has an opening function part at a place avoiding the gate mark,
The opening function part has a protrusion provided on the bottom surface of the bottom plate that breaks and opens the intake hole by pushing down, and a thin wall part and a thick wall part formed on the bottom plate part around the protrusion,
The thin wall portion is configured to be broken by pushing down the protrusion,
The thick wall portion is provided in the portion closest to the gate mark, and is smaller than the bottom plate, but thicker than the thin wall portion,
Forming a depressed recess with the projection base end surface of the projection as a bottom surface on the upper surface of the bottom plate, and forming a thin wall portion by the depressed recess;
The thick wall portion has a flat upper surface that is gently inclined from the upper surface of the bottom plate to the projection base end surface that is the bottom surface of the depressed recess, than the peripheral surface of the depressed recess,
It is in.

  The opening functional portion provided on the bottom plate of the container has a thin wall portion and a thick wall portion on the bottom plate portion around the protrusion for opening the intake hole, and a molten resin material molded into the protrusion Is filled in the projection mold surface through a narrow passage formed by the thin wall portion mold surface portion and a relatively wide passage formed by the thick wall portion mold surface portion. During the injection molding of this container, the thick wall portion is located at the portion closest to the gate mark, so that the molten resin material passing through the passage formed by the thick wall portion molding die surface portion is linear from the gate. The projection mold surface is filled. For this reason, when the container is injection-molded, the protrusions are stably and rapidly formed.

  The thick wall part, which is harder to break than the thin wall part because of the wall thickness, is located closer to the gate mark side around the protrusion, so when the protrusion is pushed down in the gate mark direction, the protrusion Inclining while supported by the thick wall portion, the thin wall portion on the opposite side of the thick wall portion is broken into a pull-up shape to open an intake hole. That is, the projection opens the intake hole by causing the thick wall portion to function as a hinge and performing stable tilt displacement.

  In the case where the recessed portion is formed on the upper surface of the bottom plate, since the recessed portion has the protrusion base end surface of the protrusion as the bottom surface, the thin wall portion to be formed is a boundary portion between the lower surface of the bottom plate and the protrusion. It becomes a part between a corner | angular part which is a boundary part of a corner | angular part and the peripheral surface of a depression recessed part, and protrusion base end surface. Thus, since the thin wall portion is a thin portion formed between the corner portions, when the pushing force is applied to the protrusion, the internal stress as the breaking force accompanying the pushing action is It acts on the thin wall part which is a corner part intensively, and thereby the thin wall part is easily broken.

  In the case where the upper surface of the thick wall portion is an inclined surface, the passage surface of the molten resin material formed by the thick wall portion molding die surface portion becomes gentle. The flow of the molten resin material flowing into the projection mold surface through the mold surface portion becomes smooth.

Since the present invention has the above-described configuration, the following effects can be obtained.
In the main configuration of the present invention, since the projection of the aperture function portion can be stably and quickly formed well, an aperture function portion that functions stably and appropriately can be obtained.

  In addition, a thin wall portion and a thick wall portion are formed on the bottom plate portion around the protrusion, and the thick wall portion is clearly less likely to break than the thin wall portion. Since the thick wall portion side functions as a “hinge” and the protrusion tilts, the protrusion of the intake hole can be obtained in an appropriate state without the protrusion falling into the container.

  In addition, in the case where the depressed portion is formed on the upper surface of the bottom plate, the thin wall portion can be easily broken, so that the opening operation is facilitated.

  In the configuration in which the upper surface of the thick wall portion is an inclined surface, it is possible to further improve the formability of the protruding portion due to the provision of the thick wall portion.

It is an external appearance perspective view from diagonally downward which shows one embodiment of this invention. It is an irregular longitudinal front view of the example embodiment of FIG. FIG. 2 is a half longitudinal sectional side view of the exemplary embodiment of FIG. 1. It is a whole top view of the example embodiment of FIG. It is a whole bottom view of the example embodiment of FIG. FIG. 2 is an enlarged longitudinal sectional front view of an opening function portion of the embodiment example of FIG. 1. FIG. 7 is an opening operation state diagram of the opening function unit shown in FIG. 6. It is an expansion vertical side view of the opening functional part of the embodiment example of FIG. It is an enlarged plan view of an opening function part of the embodiment example of FIG.

Embodiments of the present invention will be described below with reference to the drawings.
A synthetic resin cup-shaped container (see FIGS. 1 to 5) according to the present invention is a thin-walled injection molded product made of polypropylene resin, and has a cylindrical body cylinder 1 having a thickness of 0.4 mm, and this body. The cylinder 1 has a cup-shaped main body composed of a flat bottom plate 3 having a thickness of 0.45 mm, with the lower end closed and the gate mark 10 positioned at the center of the lower surface 3b. An outer casing-shaped flange piece 2 having a thickness of 0.6 mm for tightly welding a sealing sheet lid is provided on the periphery, and a short cylinder having a thickness of 0.45 mm is provided at the peripheral end of the lower surface 3 b of the bottom plate 3. A piece-like leg piece 12 is suspended.

  The barrel 1 is formed in a cylindrical shape by six wave walls through a cylindrical upper half part slightly reduced in diameter downward and a reduced diameter step part from the lower end of the upper half part, and slightly downward. It is composed of a lower half portion with a reduced diameter, and the appearance of the container is interesting due to the unevenness of the wave wall in the lower half portion.

  The leg piece 12 is suspended from a peripheral end portion of the lower surface 3b of the bottom plate 3 and a lower end of the lower half portion of the trunk portion 1 through a slightly reduced diameter step portion, and the shape thereof is defined as the trunk portion. 1 has a straight cylindrical shape having the same concave and convex shape as the wave shape of the lower half.

  A portion of the bottom plate 3 that is biased toward the peripheral edge avoiding the gate mark 10 (this portion is inside the leg piece 12) (see FIGS. 1, 2, and 5) is a part of the bottom plate 3. An opening function portion 4 (see FIGS. 6, 8, and 9) for breaking and opening the intake hole 9 is formed. The opening function portion 4 is suspended from the lower surface 3 b of the bottom plate 3. The standing protrusion 5, the recessed base 6 a which is the lower end surface of the protrusion 5, and the recessed recess 6 recessed in the upper surface 3 a of the bottom plate 3, and the thin wall formed by the recessed recess 6 It is comprised from the part 7 and the thick wall part 8 formed in the depression recessed part 6. FIG.

  The protrusion 5 of the opening function part 4 is erected at a height lower than the leg piece 12 (see FIGS. 2 and 3), and its flat cross-sectional shape is basically circular, As it gets closer, it has a flat shape (see FIGS. 5 and 6) in which the opposite side to the gate trace 10 is flattened, so that it is easy to apply a pushing force by a fingertip.

  The recessed recess 6 (see FIGS. 6 and 8) provided on the upper surface 3a of the bottom plate 3 is recessed so that the protrusion base end surface 5a of the protrusion 5 provided on the lower surface 3b of the bottom plate 3 is the bottom surface. The depth of the depression is 0.33 mm, which is slightly smaller than the thickness 0.45 mm of the bottom plate 3, and the diameter of the bottom surface thereof is slightly larger than the diameter of 3.5 mm of the protrusion base end surface 5a. It is 8 mm.

  The thin wall portion 7 (see FIGS. 6 and 8) surrounds the base end of the protrusion 5 by providing the recessed recess 6, and is between the corner between the protrusion 5 and the bottom plate 3 and the bottom surface of the recessed recess 6. Further, it is formed on the lower surface 3 b side of the bottom plate 3, and its thickness is set to a value that is thinner than the thickness of the bottom plate 3 and easily breaks, specifically 0.12 mm.

  The thick wall portion 8 (see FIG. 6 and FIG. 9) is recessed from the upper surface 3a of the bottom plate 3 to the projection base end surface 5a which is the bottom surface of the recessed portion 6 in the opening function portion 4 portion closest to the gate mark 10. The recess 6 is formed to have a flat upper surface that is gently inclined with respect to the peripheral surface on which the recess 6 is formed. That is, the portion connected to the upper surface 3a of the bottom plate 3 is the maximum thickness portion, and the portion connected to the bottom surface 3a is inclined and connected from the maximum thickness portion to the portion where the thickness connected to the protrusion base end surface 5a is zero. . The position of the protrusion base end surface 5a to which the upper surface of the thick wall portion 8 is connected is a position that is approximately a quarter of the diameter of the recessed recess 6 from the peripheral edge of the opening function portion 4 closest to the gate mark 10. In addition, the upper surface of the thick wall portion 8 has an arcuate shape (see FIG. 9) that forms a gentle inclined surface.

  The gently sloping upper surface of the thick wall portion 8 passes through the molten resin material that enters the projection 5 mold surface from the gate when functioning as a mold surface for molding the thick wall portion 8. Therefore, the flow of the molten resin material into the projection 5 surface of the mold is made smooth and quick.

  As described above, the thickness of the thick wall portion 8 is smaller than the thickness of the bottom plate 3 and larger than the thickness of the thin wall portion 7 so as to stably support the tilted and displaced projection 5. The wall thickness of the thin wall portion 7 is at least 0.1 mm in terms of formability and management, but in the example, it is set to 0.12 mm. The wall thickness of the thick wall portion 8 is preferably set within a range of 3 to 5 times the wall thickness of the thin wall portion 7.

  This depends on the value of the thickness of the thin wall portion 7, but by setting the thickness value of the thick wall portion 8 to three times or more the thickness value of the thin wall portion 7, the thin wall portion 7 When the projection 5 is tilted and displaced so as to open the intake hole 9 by breaking the 7, the thick wall portion 8 can support the projection 5 firmly and reliably and exhibit a stable hinge function. On the contrary, by setting the wall thickness value of the thick wall portion 8 to be five times or less the wall thickness value of the thin wall portion 7, the rigidity of the thick wall portion 8 becomes too large and the protrusion 5 is tilted and displaced. The inconvenience that becomes difficult is not generated.

Next, the opening operation of the intake hole 9 in the opening function unit 4 will be described in order.
The container filled with the contents is placed upside down on the receiver with the sealing sheet of the opening peeled off, and in this state, the operation arrow 11 ( In accordance with FIG. 1), a pushing force P toward the gate mark 10 is applied (see FIG. 7).

  Since the protrusion 5 is tilted and displaced with the thick wall portion 8 as a fulcrum by the action of the pushing force P, the thin wall portion 7 located on the opposite side of the thick wall portion 8 with respect to the protrusion 5 Internal stress accompanying the tilt displacement of the protrusion 5 acts. Since the internal stress acting on the thin wall portion 7 acts as a tensile breaking force, it acts on the corner between the lower surface 3b of the bottom plate 3 and the projection 5 and pushes the projection 5 down. The thin wall portion 7 can be easily broken.

  The breaking of the thin wall portion 7 progresses to the other thin wall portion 7 starting from the thin wall portion 7 on the opposite side of the thick wall portion 8 when the inclination displacement of the protrusion 5 is promoted. As a result, the intake hole 9 is opened (see FIG. 7), and the content is taken out by its own weight drop.

  In the embodiment shown in FIG. 7, the protrusion 5 formed by breaking the intake hole 9 is in a state of being connected to the bottom plate 3 by the thick wall portion 8, and this is because the thick wall portion 8 is a fulcrum portion, that is, a hinge. Therefore, this reliably prevents the occurrence of inconvenience that the protrusion 5 is depressed and displaced to damage the contents when the intake hole 9 is opened.

  A part of the flow of the molten resin material from the gate is made up of the molten resin material that has flowed out of the surface of the protrusion 5 molding die and the molten resin material that has circulated around the protrusion 5 portion on the downstream side of the protrusion 5. Since they merge, a weld line is formed in the thin wall portion 7 in this portion. In this case, the thin wall portion 7 in this portion can be easily broken.

  Moreover, as a molding resin material of the cup-shaped container by a semi-invention, it is not limited to a polypropylene resin, A polystyrene resin and a polyethylene resin can be utilized.

  As described above, the cup-shaped container according to the present invention has a structure in which the opening functional portion that breaks and opens the intake hole by the protrusion has the thin wall portion that is easy to break and the thick wall portion that is difficult to break. It is possible to easily and stably break the opening of the intake hole, and exhibit good moldability without forming defects due to the provision of a thin wall portion. A wide range of usage can be expected as a technology for removing the stored semi-solid contents.

DESCRIPTION OF SYMBOLS 1; trunk | drum 2; collar piece 3; bottom plate 3a; upper surface 3b; lower surface 4; opening function part 5; protrusion 5a; protrusion base end surface 6; depression recessed part 7; thin wall part 8; Hole 10; Gate mark 11; Operation arrow 12; Leg piece P; Pushing force

Claims (1)

A composite having a trunk cylinder (1), a bottom plate (3) closing the lower end of the trunk cylinder (1), and leg pieces (12) suspended from the peripheral edge of the lower surface (3b) of the bottom plate (3) In a cup-shaped container that is a resin injection molded product,
The bottom plate (3) has a gate mark (10) and an opening function part (4) at a place avoiding the gate mark (10),
The opening function part (4) includes a protrusion (5) provided on the lower surface (3b) of the bottom plate (3) for breaking and opening the intake hole (9), and a bottom plate around the protrusion (5). (3) It has a thin wall portion (7) and a thick wall portion (8) formed in the part,
The thin wall portion (7) is configured to be broken by pushing down the protrusion (5),
The thick wall portion (8) is provided at a portion closest to the gate mark (10), and is smaller than the bottom plate (3) but larger than the thin wall portion (7),
A concave recess (6) is formed on the upper surface (3a) of the bottom plate (3) with the base end surface (5a) of the projection (5) as a bottom surface. The thin concave portion (7) )
The thick wall portion (8) is more gently from the upper surface (3a) of the bottom plate (3) to the projection base end surface (5a) which is the bottom surface of the recessed recess (6) than the peripheral surface of the recessed recess (6). Having an inclined flat top surface,
A synthetic resin cup-shaped container.

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