JP2017095145A - Synthetic resin cup container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a synthetic resin cup container capable of further surely forming an air hole for taking out a content by simple configuration.SOLUTION: There is provided a synthetic resin cup container using polypropylene resin as a raw material. In the container, a knob 10 for forming an air hole protruding outward is provided between a gate mark and a leg in a bottom face, and a thin wall part 11 for breaking is provided around the knob 10. A protrusion 14 having a shape protruding on the thin wall part 11 at a side opposite the gate mark is provided to the bottom of the knob 10. By pushing down the knob toward the gate mark, the portion of the protrusion 14 protruding toward the thin wall part 11 at the side opposite the gate mark becomes a starting point at which the thin wall part 11 around the knob 10 breaks off. Since breaking of the thin wall part 11 proceeds from the starting point and the knob 10 falls down, the air hole can be smoothly and surely formed.SELECTED DRAWING: Figure 2

Description

  The present invention belongs to the technical field of synthetic resin cup containers for storing semi-solid foods such as pudding and jelly, and more specifically, to protrude the knob from the bottom of the main body and to take out the contents by folding the knob. The present invention relates to a synthetic resin cup container in which air holes are formed.

  Conventionally, synthetic resin cup containers have been used as containers for selling semi-solid foods such as puddings and jellies at stores, with pin-shaped knobs protruding outward from the bottom of the main unit. In order to make it easier to fold the knob, there is known a structure in which a thin wall portion is provided between the bottom surface portion of the main body and the protrusion (for example, see Patent Documents 1 and 2). In this type of cup container, after opening the seal lid, an air hole is formed by pushing and folding the knob with the container turned upside down, so that no vacuum is generated between the container and the contents. The contents are dropped by its own weight and the contents are taken out.

JP 2007-269358 A JP 2008-168946 A

  Synthetic resin cup containers such as those described above have recently been molded using a lightweight polypropylene resin that is difficult to break instead of a polystyrene resin. However, since the polypropylene resin is soft, when the knob at the bottom of the container is tilted, the thin wall portion is stretched, and the air holes may not be formed smoothly. Therefore, the openability of the thin portion is controlled by adjusting the thickness of the thin portion and the injection molding conditions, but there is a problem that the condition width is very narrow and management is difficult. If the resin weld position is set in the thin wall portion, it becomes easier to open the seal, but the risk of pinholes increases and the frequency of discharge by the inspection device in the rear line increases.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a synthetic resin cup container that can reliably form air holes for taking out contents with a simple configuration. It is to provide.

  The synthetic resin cup container of the present invention comprises a cup body composed of a cylindrical body portion and a bottom surface portion having a gate mark in the center of the back surface, and leg portions projecting around the bottom surface portion of the cup body, and is made of polypropylene resin. A synthetic resin cup container made of a material is provided with an air hole-forming knob projecting outwardly between the gate mark and the leg portion on the bottom surface portion, and around the knob for breaking A thin portion is provided, and a protrusion having a shape protruding from the thin portion on the opposite side of the gate mark is provided at the base of the knob.

  The synthetic resin cup container is preferably provided with a rib for preventing bending, which is thicker than the thin portion so as to straddle the thin portion in a state of being connected to the base of the knob, on the gate trace side of the knob. Is.

  The synthetic resin cup container of the present invention forms an air hole by pushing down the knob in the inverted state after opening, but when pushing the knob toward the gate mark, the thin wall portion is formed on the opposite side of the gate mark. The portion of the protrusion protruding toward the starting point becomes the starting point at which the thin portion around the knob is torn, and the breaking of the thin portion proceeds from there and the knob falls down, so that the air hole can be formed smoothly and reliably.

It is an external appearance perspective view shown in the state which looked at one Example of the synthetic resin cups concerning this invention from diagonally downward. It is an enlarged view which shows the knob in the synthetic resin cup of FIG. 1 in the state seen from the bottom face side. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is CC sectional drawing of FIG. It is explanatory drawing of the protrusion provided in the base of a knob.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

  A synthetic resin cup container C shown in FIG. 1 is an injection-molded product made of polypropylene resin, and includes a cup body including a cylindrical body portion 1 and a bottom surface portion 2 having a gate mark G at the center of the back surface, and a cup. And a leg portion 3 protruding around the bottom surface portion 2 of the main body. As shown in the figure, the body portion 1 of the synthetic resin cup container C of this embodiment has a cylindrical shape with a peripheral wall extending upward, and an upper half 1b having a flange 1a for a seal lid at the upper end, and the peripheral wall extends upward. However, it has a shape that combines the curved lower half 1c, and the leg 3 has the same curved shape as the lower half.

  On the bottom surface portion 2 of the cup container C, an air hole forming knob 10 protruding outward is provided between the gate mark G and the leg portion 3. The knob 10 is shorter than the leg 3 and is hidden in the leg 3 when the cup container C is upright. The cup container C is shaped so as to draw an arrow indicating the direction in which the knob 10 is tilted on the back side of the bottom surface portion 2.

  As shown in FIGS. 2 to 4, the knob 10 is provided with a thin portion 11 for breakage around the knob 10. That is, the knob 10 has a flat cross section and has a bulging portion 12 for reinforcement on the side opposite to the pushing-down direction F (see FIG. 4), but gradually expands toward the root, and a circle near the root. It expands in shape and is connected to the surrounding thin portion 11.

  The thin portion 11 around the knob 10 is in the form of a ring (outer diameter: 3.93 mm, inner diameter: 3.3 mm) located at the bottom of a mortar-shaped slope portion 13 formed so as to be recessed from the back surface side of the bottom surface portion 2. 63 mm, width: 0.15 mm, thickness: 0.1 mm). Thus, by providing the inclined surface portion 13 around the knob 10 and forming the thin circular thin portion 11 at the bottom of the groove, a space for the knob 10 to fall is formed. A protrusion 14 having a shape protruding from the thin portion 11 on the opposite side of the gate mark G is provided at the base of the knob 10. As shown in FIG. 6, the protrusion 14 has a tip angle α of 90 degrees. The tip of the thin portion 11 is formed so as to protrude to the center of the groove (a = b = 0.075 mm) with respect to the width (0.15 mm).

  Further, a rib 15 for preventing bending, which is thicker than the thin portion 11, is provided on the base of the knob 10 on the gate trace G side so as to straddle the thin portion 11 in a state of being connected to the root of the knob 10 (FIG. 5). Here, a total of four ribs 15 are provided so that the two are symmetric with respect to the direction in which the molding resin flows. Thus, by providing the rib 15 which is thinner than the thickness of the bottom portion 2 but thicker than the thin wall portion 11, the fluidity of the resin at the time of injection molding is changed, and the molten resin with respect to the area of the knob 10 is changed. Inflow is performed well and the amount of bubbles generated is reduced. When the knob is pushed down, the rib 15 serves as a fulcrum and a force is applied to the protruding portion, so that the thin-walled portion is easily started to break, and the air hole can be formed more reliably.

  Said synthetic resin cup container C is made into a sales form in the state which filled the semi-solid food in the cup main body, and gave the seal lid to the flange 1a. Then, when taking out the contents, the consumer who has purchased this peels off the seal lid, then turns the cup container C upside down on a receiving pan or the like, and pushes the knob 10 toward the gate mark G in the inverted state. Since the knob 10 is provided with the bulging portion 12 for reinforcement, the knob 10 can be pushed down without bending.

  When the knob 10 is pushed down toward the gate mark G in this manner, the force concentrates on the portion of the protrusion 14 protruding toward the thin portion 11 on the side opposite to the gate mark G, so As a starting point, the thin-walled portion 11 is peeled off from the thin-walled portion 11, and the peeling of the thin-walled portion 11 proceeds to cause the knob 10 to fall, thereby forming an air hole. When an air hole is formed in the bottom surface portion 2 of the cup container C, air enters the cup container C, the pressure difference between the top and bottom of the contents disappears, and the contents fall on the tray due to their own weight.

  At this time, a bending prevention rib 15 thicker than the thin portion 11 is provided on the gate trace side of the tab 10 so as to straddle the thin portion 11 in a state of being connected to the root of the knob 10, so the knob 10 is pushed down. At this time, the rib 15 serves as a fulcrum and a force is applied to the portion of the protrusion 14 so that the thin portion 11 is easily started to break.

  As mentioned above, although embodiment of this invention was described in detail, the synthetic resin cup container by this invention is not limited to said embodiment at all, In the range which does not deviate from the meaning of this invention, various change Is possible.

  For example, in the above embodiment, the body of the cup container C has a shape that combines a cylindrical upper half and a curved lower half, and the legs also have a curved shape. Therefore, there is no problem even if the appearance is a simple cylindrical shape extending upward, and the appearance may be other designs.

  Further, in the above-described embodiment, the angle α of the protrusion 14 is set to 90 ° with respect to the thin portion 11 having a thickness of 0.1 mm, and the tip thereof protrudes to the center of the groove width (0.15 mm). However, it is a matter of course that the dimensions of each part are slightly changed in design in consideration of the ease of breaking the thin portion 11 by the protrusions 14.

  In the above embodiment, the number of bending preventing ribs 15 is four, but it may be one or two. However, as in the above-described embodiment, the four ribs 15 provide better fluidity of the molten resin and less bubbles.

  Examples of the contents of the synthetic resin cup container of the present invention include semi-solid foods such as pudding and jelly, but are not particularly limited as long as they are semi-solid substances.

C Synthetic resin cup container G Gate trace 1 Body 1a Flange 1b Upper half 1c Lower half 2 Bottom part 3 Leg 10 Knob 11 Thin part 12 Swelling part 13 Slope part 14 Projection 15 Rib

Claims (2)

  A synthetic resin cup container made of polypropylene resin consisting of a cup body consisting of a cylindrical body and a bottom surface with a gate mark in the center of the back surface, and legs projecting around the bottom surface of the cup body. In addition, a knob for forming an air hole protruding outward is provided between the gate mark and the leg portion on the bottom surface portion, and a thin portion for breaking is provided around the knob. A synthetic resin cup container, characterized in that the base is provided with a protrusion protruding into the thin portion on the opposite side of the gate mark.   2. The synthetic resin product according to claim 1, wherein a rib for preventing bending, which is thicker than the thin portion, is provided on the gate trace side of the tab so as to straddle the thin portion while being connected to the base of the knob. Cup container.

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