JP5458432B2 - Cup-shaped container with in-mold label - Google Patents

Description

  The present invention relates to a thin cup-shaped container, which is an injection molded product made of synthetic resin, in which an in-mold label is wound around the outer peripheral surface of a cylinder.

  A cup-shaped container with an in-mold label, which is an injection-molded product made of a synthetic resin, in which an in-mold label is wound around the outer peripheral surface of the barrel is used in large quantities as a simple disposable container.

  This cup-shaped container with an in-mold label is composed of an injection-molded container body and an in-mold label positioned on the outer peripheral surface of the barrel of the container body. Is formed between the two side edges of the in-mold label positioned in a butting manner so as to expose a part of the barrel of the container body.

  As shown in Patent Document 1, the label seam is formed in a shape that is vertically linear or vertically close to a straight line, and this label is formed when a lateral force is applied to the container. There has been a problem that “cracking” tends to occur at the joint.

  The occurrence of “cracking” in the above-mentioned label seam is caused by internal stress accompanying lateral force acting on the label seam. This internal stress is caused by the label seam being linear or straight. If the shape is close, the action direction and the action location are likely to concentrate, and it is considered that “cracking” is likely to occur.

  In particular, when the container body that is injection-molded is made thin for the purpose of resource saving, if the thickness of the cylinder part where the in-mold label overlaps becomes thin to 0.6 mm, it will “crack” at the label joint. The tendency to easily occur has become strong, which has been a major obstacle to thinning the container. -

JP 2003-31678 A

  Therefore, the present invention was devised to solve the above-described problems in the prior art, so that the internal stress accompanying the lateral force acting on the label joint does not concentrate on a specific portion of the label joint. The purpose of this is to eliminate the possibility of “cracking” of the label joint in a cup-shaped container with a thin in-mold label.

The main configuration of the present invention for solving the above technical problem is:
A cup-shaped container body that is injection-molded with a synthetic resin material, and an in-mold label that is wound around the barrel outer peripheral surface of the container body;
Forming a plurality of edge recesses on each side edge of the in-mold label forming the label seam;
That the thickness of the barrel part of the container body where the in-mold label overlaps is set to 0.6 mm or less,
A large number of protruding ribs along the longitudinal direction are formed on the inner peripheral surface of the trunk so as to protrude in parallel in the circumferential direction.
Arranging a plurality of ribs within the range of the label seam formed between both side edges of the in-mold label,
It is in.

  A plurality of edge recesses are formed on both side edges of the in-mold label that are abutted on the outer surface of the container body to form a label seam. The entire eye has a shape bent in the lateral direction according to a plurality of edge recesses.

  For this reason, the internal stress accompanying the applied lateral force is dispersed in the bent portion of the label joint, and cannot be concentrated in a continuous form in a single direction.

  In addition, since the internal stress generated at the label alignment is not dispersed and concentrated in this way, it is difficult for the crack to occur at the label alignment. The wall thickness can be reduced.

Therefore, it is possible to set the thickness of the barrel portion where the in-mold labels are overlapped to 0.6 mm or less within a range in which “cracking” does not occur, thereby obtaining a thinner container.
In the case where the ridge rib is arranged in the range of the label joint, the ridge rib located in the range of the label joint functions as a reinforcing rib for the label joint portion. A significant portion of the stress will be received, which will facilitate the thinning of the container body.

Another configuration of the present invention was set a minimum wall thickness of the cylindrical body portion Lee down mold labeling is polymerized to 0.25 mm, it is intended.

Even when the minimum thickness of the cylindrical body portion Lee down mold labeling is polymerized very thin set to 0.25 mm, it is possible to secure the fluidity of the molten resin in need.

Since the present invention has the above-described configuration, the following effects can be obtained.
In the main configuration of the present invention, the internal stress accompanying the lateral force acting on the label joint is not distributed in the bent portion of the label joint and concentrated in a continuous form in a single direction. Therefore, it is possible to reliably prevent the occurrence of “cracking” due to the concentrated action of internal stress at a specific location, thereby providing a cup-shaped container with an in-mold label excellent in mechanical strength.

A plurality of ridges Li blanking, in the those placed in the scope of the label seam, position the protrusion ribs in the range of the label seam is made to receive a substantial portion of the internal stress acting As a result, it is possible to promote thinning of the container main body, so that further resource saving can be obtained.
In the case where the rib ribs are arranged in the range of the label seam, the rib ribs located in the range of the label seam receive a considerable part of the internal stress acting on the rib, thereby Therefore, further resource saving can be obtained.

Even if the minimum thickness of the cylinder part where the in-mold label overlaps is set to 0.25 mm, the fluidity of the molten resin required can be ensured, which may greatly impair the injection moldability. In addition, a cup-shaped container with an in-mold label that is thin and stable can be injection-molded stably.

It is a half longitudinal cross-sectional view which shows one example of embodiment of this invention. It is a fragmentary longitudinal cross-section which shows other embodiment examples of this invention. It is a fragmentary longitudinal cross-section which shows another example of embodiment of this invention. It is a fragmentary longitudinal cross-section which shows another example of embodiment of this invention. It is a whole top view of one example of an embodiment of the present invention. FIG. 2 is a partially enlarged cross-sectional view taken along the line AA in FIG. It is a principal part expanded longitudinal cross-sectional view of one example of embodiment of this invention. It is principal part expansion explanatory drawing of one example of embodiment of this invention.

Embodiments of the present invention will be described below with reference to the drawings.
The cup-shaped container with an in-mold label in the present invention is composed of a container body 1 that is an injection-molded product made of polypropylene resin, and an in-mold label 8, and the container body 1 (see FIG. 1) has a bottom plate 4. The flange 3 is provided around the upper end opening edge of the cylindrical barrel 2 having a diameter slightly increased upward, and the lower end portion of the barrel 2 lower than the bottom plate 4 is used as the leg piece 5.

  A large number of protrusion ribs 6 (40 in the case of the illustrated embodiment) are formed in parallel on the inner peripheral surface of the barrel 2 in the vertical direction. It is formed by reducing the thickness of the barrel 2 from the upper end (see FIG. 7), and there are six equicentral angles at the inner peripheral surface portion of the barrel 2 directly above the bottom plate 4. A protrusion 7 for preventing stacking is attached.

  In the case of the illustrated embodiment, the rib rib 6 has a flat cross-sectional shape formed into a rectangular shape (see FIG. 6), thereby ensuring good fluidity of the molten resin in the rib rib 6. I am doing so.

  The in-mold label 8 mounted in a wound shape on the outer peripheral surface of the cylinder 2 by in-mold molding has a plurality of edge recesses 10 formed on both side edges 9, and therefore, between the side edges 9. The label seam 11 which is the exposed portion of the barrel 2 formed in the above will be bent at least at both end portions thereof in a concave-convex shape. It becomes an uneven shape.

  The shape of the edge recess 10 on the side edge 9 of the in-mold label 8 and the combination thereof are not specified, and are substantially trapezoidal (see FIGS. 1, 2 and 3), sinusoidal (see FIG. 4). Shapes and combinations such as triangular shapes (see FIG. 4) are conceivable.

  In the embodiment shown in FIG. 1, the edge recesses 10 of the side edges 9 are combined so that the side edges 9 are engaged with each other by shifting the edge recesses 10 up and down, and the embodiment shown in FIG. In the example, it is combined so that the side end recess 10 of the other side end edge 9 faces the straight part of one side end edge 9, and in the embodiment shown in FIG. Are combined so that the edge recesses 10 of both side edges 9 face each other, and in the embodiment shown in FIG. 4, the side edges 9 provided with the edge recesses 10 having different shapes are provided. Are combined.

  Further, it is desirable that the unevenness formed at the side end portion of the label joint 11 by the side end concave portion 10 is set to be equal to or larger than the interval between the adjacent rib ribs 6. By setting in this way, the label The plurality of rib ribs 6 are necessarily positioned opposite to each other within the range of the seam 11, and thereby the reinforcing effect of the rib ribs 6 on the label seam 11 can be sufficiently increased.

  For example, in the case of FIG. 8, a plurality (two) of the rib ribs 6 are located within the range of the label seam 11, but each rib rib 6 is located close to both side ends of the label seam 11. Thus, the rib rib 6 causes sufficient mechanical reinforcement to act on the side end portion of the label seam 11.

  1 has a height of 109 mm, an outer diameter of the upper end of the barrel 2 of 63 mm, an outer diameter of 49 mm of the lower end, and a portion of the barrel 2 in which the in-mold label 8 overlaps. The average value of the wall thickness is 0.25 mm, and the projecting height of each rib 6 having a rectangular cross-sectional shape is 0.3 mm, and the lateral width is 0.6 mm.

  The amount of molding resin of the container body 1 of the cup-shaped container shown in FIG. 1 is 9 g, and can be significantly reduced compared to the amount of molding resin 15 g of the conventional light weight cup-shaped container of the same shape, Therefore, resource saving can be achieved sufficiently.

  The embodiment of the present invention is not limited to the illustrated example. For example, the barrel 2 may have a rectangular tube shape, and the resin to be used is not limited to polypropylene resin.

  As described above, the cup-shaped container with an in-mold label according to the present invention is capable of preventing partial deterioration of mechanical strength due to thinning in a state where the container main body is sufficiently thin. As a thinning technology using in-mold labels, a wide range of usage can be expected.

DESCRIPTION OF SYMBOLS 1; Container body 2; Cylinder 3; Flange 4; Bottom plate 5; Leg piece 6; Rib rib 7; Projection piece 8; In-mold label 9;

Claims (2)

A cup-shaped container body that is injection-molded with a synthetic resin material, and an in-mold label that is wound around the barrel outer peripheral surface of the container body. A plurality of edge recesses are formed on both side edges, and the thickness of the barrel portion where the in-mold label overlaps is set to 0.6 mm or less ,
A plurality of ribs extending in the longitudinal direction are formed on the inner peripheral surface of the barrel in parallel with the circumferential direction, and a plurality of ribs are formed between both side edges of the in-mold label. A cup-shaped container with an in-mold label , which is arranged within the range of the seam. Lee down mold label overlapping-mold labeled cup-shaped container the minimum thickness of the cylindrical body portion according to claim 1, wherein set at 0.25 mm.

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