JP2001180640A - Easily disposable plastic cup - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plastic cup which can be reduced in volume by crushing. SOLUTION: For an injection-molded plastic cup comprising a side wall 1 in an inverted truncated conical shape, a bottom plate 2 having a bottom hoop 3 at its periphery, and a flange 4 provided at an opening thereof, the bottom plate 2 is curved toward the outside, thin lines 5 each in the form of depressed groove are provided at the inside of the side wall 1 and the bottom plate 2 respectively crossing a plurality of vertical sections extending along the center axis 9 of the plastic cup, and notches 8 each opened toward the outside are provided at the bottom hoop 3 on positions whereon the thin lines 5 pass through.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an easily disposable plastic cup whose volume can be reduced after use by folding or crushing.

[0002]

2. Description of the Related Art Plastic cups made by injection molding are:
Generally, the opening, body, and bottom are integrally formed and used as it is, or used as a container with the lid material connected to the flange of the opening after filling the contents in a plastic cup. After use, it is disposed of almost as it is.

[0003]

The plastic cup formed by injection molding retains rigidity before and after use, and therefore must be discarded as it is after use.
There is a problem that the disposability is extremely poor as compared with a paper cup or the like which can be freely crushed or folded. The present invention has been made in view of this problem, and an object of the present invention is to provide a plastic cup having a reduced volume by crushing.

[0004]

An easily disposable plastic cup according to the present invention is an injection-molded plastic cup comprising an inverted truncated cone-shaped side wall, a bottom plate having a thread tail on the periphery, and a flange at an opening. The bottom plate is curved outward, the side wall intersecting with one or more vertical cross-sections passing through the central axis of the plastic cup, and the thin line formed by a concave groove inside the bottom plate. An open notch is provided for each. Further, a configuration may be adopted in which a label is integrally attached to at least the outer surface of the side wall in the injection molding die, of the outer surface of the side wall and the outer surface of the bottom plate.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail with reference to the drawings. FIG. 1 is a perspective view showing the bottom of an easily disposable plastic cup according to the present invention. The easily disposable plastic cup 10 according to the present invention, when viewed from the side or obliquely from above, has a side wall 1 of a normal inverted truncated cone shape, a bottom plate 2 having a thread end 3 around the periphery, and a flange 4 ( FIG.
), But has a plurality of cutouts 8 in the thread end 3. However, the bottom plate 2 of the easily disposable plastic cup 10 according to the present invention seen from below is curved outward as shown in FIG. In addition, the side wall 1 and the inner surface of the bottom plate 2 of the easily disposable plastic cup 10 according to the present invention include:
A continuous thin line 5 formed by a concave groove is provided at a portion intersecting with one or a plurality of vertical cross sections passing through the central axis 9, and a notch 8 opening outward is provided at a portion of the yarn end 3 abutting on the thin line 5. Is provided. These thin lines 5 cannot be seen at all from the outside. The cross section of the concave groove may be V-shaped, U-shaped, or may have a shape in which the center is gradually deepened. As shown in FIG. 1, a plurality of thin lines 5 on the inner surface of the side wall 1 and the bottom plate 2 are provided at equal intervals in the form of vertical stripes on the side wall 1, and the total number thereof is about 6 to 10 over the entire circumference. preferable. If the number is too large, the body becomes too flexible, and if it is too small, the direction of crushing the body is limited and the repetitive force as a whole becomes too large. In general, since the gate 7 of injection molding is provided at the center of the bottom, the thin line 5 is provided so as to pass through the gate 7, and according to another expression, the thin line 5 is formed at a predetermined angle from the gate 7. It is provided to radiate with a difference. The notch 8 provided in the portion of the yarn tail 3 where the thin line 5 contacts is for eliminating bending resistance when bending the thick yarn tail 3 in general.

FIG. 2 is a cross-sectional view of the easily disposable plastic cup according to the present invention passing through a thin line. As shown in FIG. 2, the side wall 1 and the bottom plate 2 are connected to each other, and a thin line 5 formed by a concave groove having a predetermined depth is continuously formed inside the side wall 1 and the bottom plate 2. The thickness of the thinnest part of the thin line 5 is preferably such that the inverted truncated cone-shaped plastic cup can be folded by hand into a substantially flat shape with little resistance and to such an extent that it is not largely restored. When the plastic material of the easily disposable plastic cup 10 according to the present invention is a polypropylene resin, the minimum thickness is preferably in the range of 0.05 to 0.3 mm. The surface of the side wall 1 is a flat inverted-cone-shaped plastic curved surface, on which a printing layer is directly provided, an adhesive label or the like is attached, or as shown in FIG. The label 6 having a single-layer or laminated structure may be integrally attached.

FIG. 3 is an explanatory view of the volume reduction of the easily disposable plastic cup according to the present invention. FIG. 3A is a side view of the easily disposable plastic cup 10 according to the present invention, and FIG. 3B is a crushed state diagram. After use, the easily disposable plastic cup 10 is bent by two opposed thin lines 5 (5-1 in the figure) when the body and the bottom are sandwiched and pressed with fingers, and both the body and the bottom are substantially flat. Crushed. FIG. 3B shows a thin line 5.
-1 is a state diagram completely crushed, but in fact, not only the thin line 5-1 part, but also the restoring force of other parts returns to a slightly original state, resulting in a slightly expanded state. Becomes However, even in this state, it greatly contributes to volume reduction. In this crushing, when a single-layered piece of paperboard or a laminated piece including paper, aluminum foil, or the like is stuck to the outside of the side wall 1, the plastic deformation of such a material is stronger than that of plastic. It can be crushed to a state close to flat. The bottom plate 2 is crushed with wrinkles and appears outside the thread end 3.

The plastic material used for the easily disposable plastic cup 10 according to the present invention is an injection molding grade such as medium density polyethylene, high density polyethylene, polypropylene, polyethylene terephthalate, polycarbonate, acrylonitrile copolymer, high impact polystyrene and the like. It is better to avoid using a material such as GP polystyrene that is broken by bending, because of the danger. Further, a plastic material containing an inorganic filler such as calcium carbonate or magnesium oxide to such an extent as not to impair the content resistance is preferable because it has good plastic deformability and is easily crushed. On the other hand, a material which is flexible and has a restoring force by rubber-based material blending or chemical blending is not preferable in use. Further, in the case of employing an in-mold labeling method in which the printing label 6 is inserted in advance in the cavity of the injection mold and then injection molding is performed,
As a material of the label 5, it is preferable to use a material having a higher plastic deformation property than plastic used for injection molding, such as paper, paperboard, and aluminum foil.

For printing on the surface of the easily disposable plastic cup 10 according to the present invention, any known printing method such as a direct curved surface printing method such as silk screen printing and dry offset printing, or a curved surface transfer printing method may be used. Alternatively, an in-mold labeling method may be used in which the print label 6 is inserted into the cavity of the injection mold in advance and then molded.

[0010]

According to the present invention, the bottom plate 2 of the rigid plastic cup is bent outward, and a plurality of recesses radiating from the center of the bottom plate 2 to the inner surface of the side wall 1 and the bottom plate 2 at a predetermined angle difference. By providing a thin line 5 composed of a groove and providing a cutout 8 that opens outward in a portion of the yarn tail 3 to which the thin line 5 approaches, after use, the two thin lines 5 opposed to each other can be used. It is possible to provide a plastic cup which can be squashed almost flatly and which is excellent in disposal property due to volume reduction.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the bottom of an easily disposable plastic cup according to the present invention.

FIG. 2 is a sectional view of an easily disposable plastic cup according to the present invention.

FIG. 3 is an explanatory view of volume reduction of an easily disposable plastic cup according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Side wall 2 Bottom plate 3 Thread end 4 Flange 5 Thin line 6 Label 7 Gate 8 Notch 9 Center axis 10 Easy-to-dispose plastic cup according to the present invention

Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat II (Reference) B29K 101: 12 B29K 101: 12 105: 20 105: 20 B29L 22:00 B29L 22:00 F-term (Reference) 3E033 AA08 BA13 BB08 CA20 DD02 FA02 4F202 AA11 AD09 AG07 AG24 AH55 AH56 CA11 CB19 CK11 4F206 AA11 AD09 AG07 AG24 AH55 AH56 JA07 JB19 JF51 JQ81 4F301 AA14 BA21 BB04 BF17 BF31

Claims (2)

[Claims] 1. An injection-molded plastic cup comprising an inverted truncated cone-shaped side wall, a bottom plate having a thread tail in the periphery, and a flange of an opening, wherein the bottom plate is curved outward and the plastic cup is A thin line formed by a concave groove is provided inside the side wall and the bottom plate that intersects with one or more vertical cross sections passing through a central axis, and a cutout that opens outwardly is provided at the thread end. Easy to dispose of plastic cups. 2. The easily disposable plastic according to claim 1, wherein a label is integrally attached to at least the outer surface of the side wall of the outer surface of the side wall and the outer surface of the bottom plate in an injection mold. cup.