JP2001180644A - Easily disposable in-mold plastic cup - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an in-mold plastic cup made by in-mold injection molding which can be crushed to allow reduction in volume. SOLUTION: The in-mold plastic cup comprises a sidewall 1 forming an inverted truncated circular cone shaped barrel, a base plate 2 and an opening having a flange 4, wherein a label is integrally welded to an external surface of the sidewall 1. The base plate 2 comprises a wheel-like skeleton including a plurality of spokes 5 which radiate from the center 6 of the base plate in an approximately horizontal direction with a predetermined angle to reach an outer periphery 7 of the base plate and a base label 8' welded to an external surface of the skeleton. A plurality of thin lines 9 comprising a dented groove are formed in vertical stripes on an internal surface of an inner plastic layer of the sidewall 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Generally, an in-mold plastic cup formed by an in-mold injection molding method has an opening, a body, and a bottom integrally formed, and is used alone or filled with contents. Thereafter, the lid material is sealed at the flange of the opening by means of heat sealing, fitting, or the like, and used as a container. However, after use, the lid material is almost completely discarded.

[0003]

The cup formed by in-mold injection molding retains rigidity before and after use, and must be discarded in its original form 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 in-mold plastic cup according to the present invention comprises a side wall forming an inverted truncated cone-shaped body, a bottom plate, and an opening having a flange, and an outer surface of the side wall. An in-mold plastic cup formed by in-mold injection molding in which a label is integrally welded to a part of the bottom plate, wherein the bottom plate radiates substantially horizontally at a predetermined angle from a center portion of the bottom plate to a plurality of pieces reaching the outer periphery of the bottom plate. A wheel-shaped skeleton provided with spokes made of plastic, and a bottom label welded to the outer surface of the skeleton, and a plurality of thin lines formed by concave grooves are formed in a vertical stripe shape on the inner surface of the plastic layer inside the side wall. In addition, in the outer peripheral portion of the bottom plate, the end of the thin line is located in the middle of the adjacent spokes.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail with reference to the drawings. FIG. 1 is a structural explanatory view of an easily disposable in-mold plastic cup according to the present invention. FIG. 1 (a)
Is a perspective view of the inside, and FIG. 1B is a longitudinal sectional view of a portion having a spoke. The easily disposable in-mold plastic cup 10 according to the present invention has the same appearance as that of a continuous in-mold plastic cup, and includes an inverted truncated cone-shaped side wall 1, a bottom plate 2, and an opening having a flange 4. A body label 8 is integrally adhered to the outer periphery of 1. The thread tail 3 around the bottom plate 2 does not necessarily need to be provided, and may be a flat bottom surface. Here, the “label” has not only a function as a mere decoration and an information medium, but also a barrier function to further enhance the quality protection function of the content by a single plastic used depending on the content. Of course, it is preferable that the used portion covers the entire area of the plastic cup including the bottom plate 2.

As shown in FIG. 1A, the bottom plate 2 of the easily disposable in-mold plastic cup 10 according to the present invention radiates from a bottom plate center 6 (hereinafter referred to as a hub) and a bottom plate outer peripheral portion 7 (hereinafter referred to as a rim). ), And a bottom label 8 ′ welded to the outer surface (lower side in the figure) of the wheel-like plastic having a plurality of spokes 5, and a thread end 3 at the lower part of the rim 7. Are linked. The thread tail 3 is not necessarily provided, and the bottom may be formed in a flat state. The skeleton by the spokes 5 provided radially has an appropriate strength at the bottom,
In addition to functioning as a flow path for pouring the molten plastic injected from the gate G shown in FIG. 1 (b) into the entire area of the mold during injection molding, it also functions as a means for easily crushing the bottom. are doing. That is, the spokes are caused by the bottom plate 2
Although it is not shown, the thickness of each spoke 3 is not uniform, and it is preferable that a portion near the hub 6 and the rim 7 is formed thin. The number of spokes 5 in this framework is 4 to 12
The range of the book is preferable, and preferably about 6 to 8 books.
As shown in FIG. 1, the bottom label 8 ′ can be seen from between the frameworks of the bottom plate 2. Since the inner surface of the bottom label 8 ′ which is visually observed is a portion where the contents come into contact, not only the thermal adhesion to the framework but also the contents resistance is considered.

As shown in FIG. 1, a side wall 1 forming a body portion
Has a body label 8 on the outside of the plastic layer to be molded.
Are integrally adhered, and a flange 4 to which a lid member (not shown) is thermally bonded or fitted is fitted to the opening.
Are formed. On the inner surface of the plastic layer on the inner side of the side wall 1, thin lines 9 composed of a concave groove having the thinnest center portion are formed at substantially equal intervals in the form of vertical stripes. It is bent by two opposing thin lines 9 and is easily crushed. The thickness of the thinnest part of the thin line 9 is such that the easily disposable in-mold plastic cup according to the present invention can be folded by hand, substantially flat, and not to a large extent without much resistance. The polypropylene resin is used as the plastic material of the easily disposable in-mold plastic cup 10 according to the present invention, and when the opening diameter is 60 to 100 mmφ, the minimum thickness in the concave groove is 0.05 to 0. It is preferably in the range of 3 mm. The larger the number of thin-walled lines 9, the easier it is to crush the side wall 1. However, if the number is too large, the rigidity, buckling strength, etc. of the entire side wall 1 will be weakened. It is preferable to provide them at equal intervals. The sectional shape of the concave groove of the thin line 9 is
The shape may be V-shaped, U-shaped, or a shape in which the central portion gradually becomes shallower. In addition, since the bottom needs to be crushed at the same time by crushing the trunk, the end of the thin line 9 is located near the rim 7 of the bottom plate 2 and in the middle of the adjacent spokes 5.

FIG. 2 is an explanatory view of the volume reduction of the easily disposable in-mold plastic cup according to the present invention. FIG.
2A is a side view before being crushed, and FIG. 2B is a front view of the crushed state. When the easily disposable in-mold plastic cup 10 according to the present invention as shown in FIG. 2A is sandwiched and pressed by hands as shown by arrows from both sides of the front and back sides, the opposing 2 on the side surface (the center in the figure) is pressed. The side wall 1 is folded substantially flat by the thin line 9 of the book.
At this time, the bottom is also squashed flat at the same time, and FIG.
Is crushed into a substantially flat shape as shown in FIG. Side wall 1
The bottom plate 2 is squashed while forming wrinkles along the thin lines 9 other than the two thin lines 9 that bend at the side. It is crushed as if it were pushed out. At this time, the bottom label 8 ′ is also crushed almost flat while causing wrinkles between the spokes 5 similarly to the side wall 1 with destruction near the rim 7. The easily disposable in-mold plastic cup 10 according to the present invention is crushed into a complicated shape as shown in FIG. 2 (b). difficult. However, there is a remarkable effect of volume reduction as compared with the original cup shape. When plastic and plastic materials with strong plastic deformation are used for the labels 8 and 8 ', especially when plastic and plastic materials with strong plastic deformation such as aluminum foil are used for the body label 8 and the bottom label 8' Since the restoring force is reduced, the effect of volume reduction by crushing becomes more remarkable.

The plastic material used in the easily disposable in-mold plastic cup 10 according to the present invention includes medium density polyethylene, high density polyethylene, polypropylene, polyethylene terephthalate, polycarbonate,
Injection molding grades such as acrylonitrile copolymer, high impact polystyrene, etc., which may be cracked by bending, such as GP polystyrene, involve a risk. 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. In addition, the easily disposable in-mold plastic cup 10 according to the present invention is molded by an in-mold injection molding method in which the labels 8, 8 'are inserted in advance into the cavities of the injection mold and then the injection molding is performed. , Labels 8, 8 '
It is preferable to select a material having excellent compatibility and thermal adhesion with the plastic used for injection molding.

For the labels 8, 8 'used in the easily disposable in-mold plastic cup 10 according to the present invention, a laminated film is generally used. Contents are food,
In the case of beverages and the like, it is necessary to have the above-described barrier properties, and it is necessary to weld the body label 8 and the bottom label 8 ′ to both the side wall 1 and the bottom plate 2. The specifications have, for example, the following configuration in order from the outside. OPP30 / LMD / PET12 / ink layer / LMD /
Aluminum foil 7 / LMD / HSOPP30 Further, in the case where a food or beverage does not require much barrier property, or in the case of a non-food such as a wet tissue, for example, a laminated film having the following configuration in order from the outside Can be used. Antistatic coating layer / OP varnish / ink layer / OPP60 / heat sealant Antistatic coating layer / OP varnish / ink layer / HSOPP50 OP varnish / ink layer / synthetic paper 95 g / m ² where OPP; stretched polypropylene OP Varnish; Varnish for overprint PET; Polyethylene terephthalate HSOPP; Heat-sealable stretched polypropylene LMD; Dry laminating adhesive layer Antistatic coating; Antistatic coating layer The numbers indicate thickness μm.

For printing on the surface of the easily disposable in-mold plastic cup 10 according to the present invention, preprinting by gravure printing or the like in a processing step from a rolled raw material of 1 bell 8, 8 'can be adopted. Compared to the conventional curved surface printing of molded cups, it is powerful and can provide a beautiful printing effect. Further, by providing a printing ink layer on the back surface of the polyethylene terephthalate film, that is, back printing, it is possible to prevent the ink layer from directly coming into contact with the content and to give a glossy feeling. Easy disposable in-mold plastic cup 10 according to the present invention
In the case of (1), it is only necessary to insert the preprinted label into the mold at the time of injection molding, and efficient production becomes possible, as compared with a conventional labeling method such as an adhesive label.

[0012]

According to the present invention, a plurality of plastic spokes 5 radiating the bottom plate 2 of the plastic cup formed by in-mold injection molding substantially horizontally from the center of the bottom plate at a predetermined angle and reaching the outer periphery of the bottom plate. And a plurality of thin lines 9 formed by concave grooves formed on the inner surface of the plastic layer inside the side wall 1 in the form of vertical stripes. After use, by hand, from both sides simultaneously with the torso,
The bottom can also be squashed almost flat, and a plastic cup excellent in disposal by volume reduction can be provided. Also, depending on the laminated structure of the body label 8 and the bottom part 8 ', excellent barrier properties can be provided.

[Brief description of the drawings]

FIG. 1 is a structural explanatory view of an easily disposable in-mold plastic cup according to the present invention.

FIG. 2 is an explanatory view of volume reduction of an easily disposable in-mold plastic cup according to the present invention.

[Explanation of symbols]

Reference Signs List 1 (body) side wall 2 bottom plate 3 thread end 4 flange 5 spoke 6 bottom plate center (hub) 7 bottom plate outer periphery (rim) 8 body label 8 'bottom label 9 thin line 10 easy-to-dispose in-mold plastic according to the present invention Cup G Gate

Claims (2)

[Claims] 1. A side wall forming an inverted truncated cone-shaped body,
An in-mold plastic cup made by in-mold injection molding, comprising a bottom plate and an opening having a flange, and a label integrally welded to a part of an outer surface of a side wall bottom plate, wherein the bottom plate is provided at a predetermined distance from a center of the bottom plate. A wheel-shaped skeleton provided with spokes made of a plurality of plastics radiating substantially horizontally at an angle of 外 周 and reaching the outer periphery of the bottom plate, and a bottom label welded to an outer surface of the skeleton, and a plastic layer inside the side wall. An easily disposable in-mold plastic cup, wherein a plurality of thin lines formed by concave grooves are formed in a vertical stripe shape on an inner surface. 2. The easily disposable in-mold plastic cup according to claim 1, wherein an end of the thin line is located at an intermediate portion between the adjacent spokes in the outer peripheral portion of the bottom plate.