JP5737645B2 - Synthetic resin cup container with in-mold label - Google Patents

Description

The present invention relates to a cup container in which a label is attached to a side peripheral wall of a container body by in-mold injection molding.

For example, Patent Document 1 describes an invention relating to a cup container to which a label is attached by in-mold injection molding and a manufacturing method thereof.
FIG. 4 is a schematic explanatory diagram relating to a synthetic resin cup container with an in-mold label as described in Patent Document 1 and its manufacturing method. The label 111 is wound into a cylindrical shape to form a cavity mold 131. In the set state, the molten resin is injected from the gate 134 disposed on the bottom mold 133 to mold the container main body 101, and at the same time, the label 111 is attached to the surface of the side peripheral wall 102 of the container main body 101.

  The container body 101 shown in FIG. 4 is characterized in that a short cylindrical leg 107 is formed so that the side peripheral wall 102 protrudes from the bottom surface of the bottom 105. The leg 107 functions as a grounding part, and at the time of in-mold injection molding, the label 111 is wrinkled at the lower end due to the molten resin that is injected from the gate 134 and flows as described above. The function of effectively preventing 111 from peeling off is exhibited.

Here, FIG. 5 is a schematic explanatory view relating to a cup-shaped container having no leg 107 as in the container main body 101 of FIG.
As shown in FIG. 5, in the molding of the container body having such a leg-less shape, the molten resin flowing from the gate 134 collides with the lower end of the label 111 and flows upward (FIG. 5). A force that pushes the lower end portion of the label 111 upward acts, and as a result, wrinkles and peeling occur at the lower end portion of the label 111. On the other hand, by forming the leg portion 107 as in the container body 101 of FIG. 4, the flow of the molten resin branches up and down (see the arrow in FIG. 4), and the molten resin flows downward at the lower end of the label 111. Therefore, a force acts on the lower end portion of the label 111 in the pulling direction, and the occurrence of wrinkles and peeling as described above can be reliably prevented.

JP-A-8-132477

  However, in the cup container shown in FIG. 4, since the leg portion 107 serves as a grounding portion, the lower end portion of the leg portion 107 falls on the joint of the belt conveyor in the content filling line, and the product falls. There is a problem that the lower end portion of the leg portion 107 is caught or the like falls during the display or use.

Therefore, the present invention is a plastic resin cup container with an in-mold label, particularly sticking property of labels without wrinkles and peeling at the lower end of the side peripheral wall, stable transportability in a filling line, etc. The technical challenge is to create a shape of the container body that can achieve stable standing at a high level.

Among the means for solving the above technical problems, the main configuration of the present invention is as follows.
In the cup container in which the label is pasted over the entire height range by in-mold injection molding on the side peripheral wall of the container body,
From the predetermined height position of the lower end portion of the side peripheral wall of the container body, the bottom portion in which the grounding portion is circumferentially arranged on the periphery via the inner flange-shaped peripheral piece is suspended,
Chamfer the corners connected to the outer periphery of the grounding part in an arc shape,
The lower end of the side peripheral wall protrudes downward from the inner flange-shaped peripheral piece,
The lower end of the label is positioned to match the lower end of the side wall,
Further, the lower surface of the grounding portion protrudes downward from the lower end of the side peripheral wall, and the projecting height of the grounding portion protruding from the lower end position of the side peripheral wall is in a range of 1 mm to 2 mm .
It is said.

  According to the above configuration, at the time of in-mold injection molding, the molten resin injected from the gate disposed in the center of the bottom portion corresponding to the bottom of the container body of the cavity mold (or bottom mold), It flows through the part corresponding to the bottom of the mold cavity, passes through the part corresponding to the inner flange-shaped peripheral piece, reaches the part corresponding to the side peripheral wall, and then branches upward and downward to flow through the part corresponding to the side peripheral wall. Since the molten resin flows downward in the vicinity of the lower end of the sheet, a force acts in the pulling direction on the lower end of the label, realizing a high level of label stickiness without wrinkles and peeling at the lower end of the side peripheral wall. be able to.

  On the other hand, a stable grounding function can be exerted by the grounding portion arranged circumferentially on the periphery of the bottom part suspended through the inner hook-shaped peripheral piece, and stable transportability in the filling line etc. It is possible to ensure stable standing during display and use independently of the label sticking property.

With the above configuration, by rounding the corner connected to the outer peripheral edge of the grounding portion in a circular arc shape, it is possible to easily pass the seam of the belt conveyor of the filling line, and the fall due to the catch at the seam It can prevent more effectively.
The radius of curvature of the corner can be appropriately determined depending on the condition of the conveying line, but in general, the radius of curvature is preferably 1 mm or more.

If the protrusion of the grounding part that protrudes from the lower end position of the side peripheral wall is too large, the bottom part to which the label is not affixed appears to be exposed and the decorating property of the entire container is impaired, and if it is too small, the lower end part of the side peripheral wall Since the transportability is impaired due to being caught or the like, it is preferable that the protrusion from the lower end of the side peripheral wall of the grounding portion is in the range of 1 mm to 2 mm.

Since the present invention has the above-described configuration, the following effects can be obtained.
The main configuration of the present invention is that the part that exhibits the function relating to the transportability in the container main body and the part that exhibits the function related to the sticking property of the label can be used as separate parts, respectively, so that the function can be exhibited independently. And
In the vicinity of the lower end of the portion corresponding to the side peripheral wall of the mold cavity, the molten resin flows downward, so that it is possible to achieve a high level of label sticking without wrinkles and peeling at the lower end of the side peripheral wall. A stable grounding function can be exerted by the grounding portion arranged circumferentially on the peripheral edge of the bottom part suspended through the inner flange-shaped peripheral piece, and there is no wrinkle or peeling at the lower end of the side peripheral wall It is possible to achieve both high sticking property, stable transportability in a filling line, etc., and stable uprightness during product display and use at a high level.

It is a half vertical front view which shows one Example of the cup container of this invention. It is a bottom view of the container main body of the container of FIG. It is the longitudinal cross-sectional view which expanded the principal part vicinity of the bottom part of the container of FIG. It is a schematic explanatory drawing which concerns on the in-mold label container of a prior art example, and its manufacturing method. It is a schematic explanatory drawing which concerns on the in-mold label container of another prior art example, and its manufacturing method.

Hereinafter, it demonstrates along the Example according to this invention, referring drawings.
1 to 3 show an embodiment of a synthetic resin cup container with an in-mold label according to the present invention. FIG. 1 is a front view of a half longitudinal section, FIG. 2 is a bottom view of the container body 1, and FIG. It is the longitudinal cross-sectional view to which the principal part of 5 vicinity was expanded.

In this container, a label 11 is pasted over the entire height, substantially the entire circumference, of the side wall 2 of the container body 1 made of synthetic resin by in-mold injection molding.
The container body 1 has a cylindrical side peripheral wall 2 that gradually decreases in diameter toward the lower side, and a flange 9 is provided around the upper end of the side peripheral wall 2.
A plurality of projecting pieces 10 are provided on the inner peripheral surface of the side peripheral wall 2 to prevent stacking when stacking cup containers.

In addition, a shape in which a bottom portion 5 having a recessed recess 6 at the center and a grounding portion 7 at the periphery is suspended from the height position near the lower end of the side peripheral wall 2 through the inner flange-shaped peripheral piece 4 is provided. The lower end portion of the side peripheral wall 2 protrudes downward from the inner collar-shaped peripheral piece 4 to form the protruding portion 3. In this embodiment, the protruding height h1 downward from the inner collar-shaped peripheral piece 4 at the lower end of the side peripheral wall 2 is 1.8 mm.
Moreover, the protrusion height h2 from the lower end of the side peripheral wall 2 of the lower surface of the grounding part 7 is 1.3 mm.

  In addition, the grounding width of the grounding portion 7 is set to 6 mm, and the radius of curvature R of the corner portion 8 connected to the outer peripheral edge of the grounding portion 7 is set to 2 mm in order to more surely prevent the falling at the joint of the belt conveyor of the filling line. Yes.

  This cup container uses a mold substantially the same as that shown in FIG. 4, with the label 11 wound in a cylindrical shape as an insert material set in an adsorbing manner on the mold surface of the cavity mold 131. Molding can be performed by injecting molten resin from 134 and filling the mold cavity. (See Figure 4)

  Here, at the time of the in-mold injection molding, the molten resin injected from the gate disposed in the center of the portion corresponding to the bottom portion 5 of the mold cavity flows through the portion corresponding to the bottom portion 5 toward the periphery, and has an inner collar shape. The portion corresponding to the side peripheral wall 2 is reached through the portion corresponding to the peripheral piece 4, and from here, as indicated by the two-dot chain line arrow in FIG.

  And in the part corresponded to the protrusion part 3 area | region of the side peripheral wall 2, since molten resin flows below, as shown in FIG. 3, it pulls on the label 11 set to the said cavity metal mold | die part. By applying a force in the direction, the lower end portion of the label 11 can be reliably adhered to the lower end portion of the side peripheral wall 2 without wrinkles or peeling.

  On the other hand, a stable grounding function can be exhibited by the grounding portion 7 that is circumferentially disposed on the periphery of the bottom portion 5 that is suspended via the inner flange-shaped peripheral piece 4. In the filling line, the belt conveyor is combined with the action and effect obtained by chamfering in an arc shape, and further the action and effect in which the protruding height h2 from the lower end of the side peripheral wall 2 on the lower surface of the grounding portion 7 is 1.3 mm and 1 mm or more. It was possible to effectively prevent the fall due to the seam.

  Further, in this embodiment, by setting the projection height h2 from the lower end of the side peripheral wall 2 on the lower surface of the grounding portion 7 to 1.3 mm and 2 mm or less, there is almost no exposure of the bottom 5 when viewed from the side, The decoration effect by the label 11 was able to be exhibited over the whole height range of the container.

As mentioned above, although embodiment of this invention and its effect were demonstrated along the Example, this invention is not limited to this Example.
For example, although the container body is cylindrical in the above embodiment, it may be rectangular.
Moreover, although the said Example affixed a label over substantially the whole periphery, the effect of this invention is fully exhibited, for example, also when affixing only on the front.

As described above, the synthetic resin cup container with an in-mold label according to the present invention is capable of sticking labels without peeling or peeling at the lower end of the side peripheral wall, stable transportability in a filling line, etc. Stable uprightness during use is achieved at a high level, and is expected to be widely used as a labeled cup container.

DESCRIPTION OF SYMBOLS 1; Container main body 2; Side peripheral wall 3; Protrusion part 4; Inner collar-like peripheral piece 5; Bottom part 6; Depression recessed part 7; Grounding part 8; Corner part 9; Side peripheral wall 105; bottom 107; leg 111; label 131; cavity mold 132; core mold 133; bottom mold 134; gate h1;

Claims (1)

A cup container in which the label (11) is pasted over the entire height range by in-mold injection molding on the side peripheral wall (2) of the container body (1),
A bottom part (5) in which a grounding part (7) is arranged circumferentially from the predetermined height position of the lower end part of the side peripheral wall (2) of the container body (1) through an inner flange-like peripheral piece (4). Hang down
The corner (8) connected to the outer peripheral edge of the grounding portion (7) is rounded in an arc shape,
The lower end of the side peripheral wall (2) protrudes downward from the inner flange-shaped peripheral piece (4),
The lower end of the label (11) is positioned to match the lower end of the side peripheral wall (2),
Further, the lower surface of the grounding portion (7) protrudes downward from the lower end of the side peripheral wall (2), and the protruding height of the grounding portion (7) protruding from the lower end position of the side peripheral wall (2) ( A synthetic resin cup container with an in-mold label , wherein h2) is in the range of 1 mm to 2 mm .

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