JP2003128104A - Polygonal covering lid made of paper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polygonal covering lid made of paper excellent in appearance which can be tightly fitted to an upper surface of a cup vessel or the like by drawing a paper material by pressing. SOLUTION: A blank mainly consisting of a paper is drawn to form a paper lid integrally comprising a top plate of the lid, and a skirt from a circumferential edge of the top plate substantially in a perpendicular direction. The skirt is returned inwardly from a lower end thereof, and a double structure is formed over one half of the height of the skirt.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper cover which is attached to the upper surface of a container for storing food such as yogurt.

[0002]

2. Description of the Related Art As is well known, a lid material of a food container for accommodating food such as ice cream and yogurt is made of thin plastic. This plastic lid has low strength and is easily broken, and the food inside may leak or be deformed. Therefore, conventionally, for example, in a yogurt container, after filling the contents in a cup-shaped container,
After sealing the upper surface of the container with the inner lid of film or laminated paper so that there is no leakage, cover the plastic lid from above to improve the sealing performance.
The space created by the cover and inner lid was designed to store sugar in a small bag and a small spoon. In addition, by providing a plate-like protrusion that is one size smaller than the container bottom size in the center of the top surface of the cover,
The bottom of the upper container and the plate-like protrusion of the lower container are intermeshed with each other so that the upper and lower containers can be stacked without causing displacement.

[0003]

As described above, the molded lid made of plastic is the mainstream of the conventional cover lid.
When it is disposed of in landfill after use, it causes a problem of polluting the environment, and even if it is incinerated, it has to be mixed with a combustible material such as paper dust and the like and incinerated. Users who wish to recycle this type of packaging waste
There is a problem that it cannot meet the request of. For these reasons, reduction of container and packaging waste, which has become a problem in recent years,
Contrary to the trend of resource-recycling society, food containers with a plastic cover tend to be shunned by consumers.

By the way, the shape of a container for ice cream or yogurt or its lid is generally circular. However, popular foods such as ice cream and yogurt are intended to be different from other competing products in order to distinguish and distinguish them from each other. Sellers have begun to demand that the lids have a deformable and unique shape.

Therefore, like a plastic lid, it is easy to mold, has good printability for cosmetics, has high strength, is not easily deformed or damaged, and can securely seal the upper surface of the cup container. Also, the paper can be discarded at the time of disposal. There is a need for a paper-type cover lid that is suitable for recycling without the need to separate it into plastic.

[0006] Therefore, a first object of the present invention is to provide a paper lid material excellent in aesthetics that can be fitted and adhered to the upper surface of a cup container or the like while using a sheet of paper-based material as a cover lid for the cup container. It is to be able to manufacture by drawing by pressing.

The present inventor has studied a method for drawing a paper material, which is a material that is harder to mold than plastics, into a unique shape that does not exist in a conventional cover. As a result, the material has at least a paper layer. By using a laminated paper with a thermoplastic synthetic resin on one side, the top plate and skirt of the lid material have a specific shape as described later, so that it has strength at the time of use and can reliably seal the upper surface of the container. A solution that can provide a cover lid that has fitting performance and that when fitted on the open upper surface of a container, can be engaged securely and securely so that it does not easily come off and that the lid itself can also be cosmetically printed. It is a means of finding means.

[0008]

Means for solving the problems adopted by the present inventor are as follows. A first aspect of the present invention uses a blank mainly composed of a sheet of paper material, and a top plate portion of a lid member and a skirt portion are integrally formed by drawing from a peripheral edge of the top plate portion in a substantially vertical direction. In the polygonal cover, the skirt part is folded inward from the lower end part thereof and has a double structure over more than half of the height of the skirt part. is there.

A second aspect of the present invention is characterized in that the top plate portion of the lid member is formed with an annular flat surface portion and a projecting portion that rises like a plateau inside the annular flat surface portion. The polygonal cover according to claim 1.

A third aspect of the present invention is the polygonal cover according to claim 2, wherein the central protruding portion of the lid is provided with an embossed marking.

According to a fourth aspect of the present invention, the folded-back portion which is bent inward at the peripheral edge of the end portion of the skirt portion is heat-sealed or glued to the inner surface of the skirt portion. The polygonal cover according to any one of 3 to 3.

In a fifth aspect of the present invention, the blank is formed by laminating a thermoplastic synthetic resin layer on at least one side of a paper layer, and the polygon according to any one of claims 1 to 4. It is a cover.

A sixth aspect of the present invention is the polygonal cover according to claim 5, wherein the thermoplastic synthetic resin layer is a thermoplastic synthetic resin layer having a softening point of 150 ° C. or higher.

A seventh aspect of the present invention is characterized in that the paper layer constituting the main body of the paper lid member is formed of a cup base paper having a basis weight of 100 to 350 g / m ^2. It is the described polygonal cover.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described with reference to the drawings. The lid material of the present invention uses a blank mainly composed of a sheet of laminated paper and is drawn by pressing to form a lid material. A lid member integrally formed with a top plate portion and a skirt portion from a peripheral edge of the top plate portion in a substantially vertical direction,
The skirt portion is folded inward from its lower end portion,
It is characterized by a double structure over half the height of the skirt.

FIG. 1 shows an example of a cover lid 10 of the present invention having a substantially rectangular shape with rounded corners. In the figure, FIG.
Top view of the inside of the lid with the lid top surface 11 facing down, FIG. 1 (b)
[Fig. 4] is a side view similarly cut out. 2 is a view showing a state in which the cover lid of the present invention is attached so as to wrap around the curl flange portion 31 of the paper cup container 30, of which FIG. 2 (a) is a side view and FIG. 2 (b). ) Is a partially enlarged sectional view. FIG. 3 shows the blank 2 of the present invention before molding.
It is a top view which shows 0.

The blank 20 used in the present invention is composed of a multi-layer sheet in which a thermoplastic resin is laminated on both sides or one side of paper. More specifically, in order to prevent the paper layer, which is mainly composed of blanks, from being broken during drawing, it is preferable to use a base paper having good stretching performance. Examples of such base paper include cup base paper (sometimes referred to as cup base paper). Here, the cup base paper refers to a raw material made of bleached chemical pulp, which is subjected to strong size and made by a cylinder or Fourdrinier paper machine, and has a paper quality similar to that of high-quality paper or bleached kraft paper. The basis weight of the paper is not particularly limited, but a range of 100 to 350 g / m ² is used, and a desirable basis weight is 160 to 260 g / m ² . When the weight is 350 g / m ² or more, it is difficult to fold the skirt portion during molding, and the skirt portion is 100 to 350.
When the weight is less than g / m ² and the weight is low, the stiffness is lost, and molding is difficult in this case as well.

A preferred example of the multilayer sheet used in the present invention is such that at least one side of the paper layer has, for example, polyethylene (P
E) or heat-sealable laminated paper obtained by laminating a thermoplastic resin such as polypropylene (PP). Further, it may have one layer or two or more layers between the paper layer and the thermoplastic resin layer. A printing layer can be provided between the paper layer and the resin layer as required. The reason why the printed layer is placed between the resin and the base paper is that the surface of the base paper comes into contact with the mold and is strongly squeezed when drawing, and the print is rubbed. Is better to use.

In the usual case, a double-sided laminated paper obtained by winding a beautifully printed base paper with a double-sided PP laminate using a tandem extruder is used as the multilayer sheet.
The extruded thickness is 20 μm as an example. The thickness of the multilayer sheet is related to the base paper thickness, but the resin thickness is 20 to 5
When it is 0 μm, it is about 0.16 to 0.50 mm, preferably about 0.20 to 0.40 mm.

The lid material of the present invention is first cut into a flat sheet using the above-mentioned multilayer sheet as a raw material, and then, as shown in Example 1 described later, the above-mentioned laminated blank is cut into a predetermined shape, and thereafter, At the same time as punching into a rectangle, long and short ruled lines 21 and 22 were formed at the positions corresponding to the corners. FIG. 3 shows an example of a rectangular-shaped rounded blank 20.

<Embodiment 1> Blank shape: R-shaped rectangle: Longitudinal direction 90 mm, width direction 63 mm Corner R is about 20 R Height 12 mm (including central protrusion height 4 mm) Folding height 7 mm Material composition: (inner surface ) PP 20 μm / cup base paper 265 g /
m ² (printed) / PP 20 μm Circumferential flat portion width: 7 mm

Next, the punched blanks were supplied to the draw forming machine one by one and draw-formed as follows.

FIG. 4 is a schematic explanatory view showing a draw forming process of the cover according to the present invention, in which flat blanks 20 each having a predetermined shape are fed to the forming machine one by one and drawn as follows. . First, the blank 20 is inserted into a die set having an upper die and a lower die (male and female) (first step). Next, after fixing the blank peripheral portion with the fixed lower die 40a, the dividable lower die 40 including the movable lower die 40b, and the blank holder 41, the protrusion of the central portion 11a of the blank with the upper die (male die) 42. Processing is performed (second step).

Next, the upper die 42 is lowered as it is, the blank 20 is sandwiched between the upper die 40 and the movable lower die 40b and pulled downward, and the portion sandwiched between the blank holder 41 and the fixed lower die 40a is removed. Removed from the holder, blank holder 4
The skirt portion is formed by being sandwiched between 1 and the side portion of the upper mold 42 and bent at a right angle (third step). Subsequently, the blank whose cross-sectional shape is formed in a U-shape is provided with the edge bending die 43
Then, the skirt portion is folded back (fourth step). Lastly, the folded-back portion is bonded to the inner surface of the skirt portion by the split seal die 44 (fifth step). In this example, 7.5 mm of the 18 mm length of the skirt portion was folded back inward. At the same time when the folding process was performed, the folding part was adhered to the inner surface of the skirt part by preheating with a hot air device or the like. Incidentally, reference numeral 45 is a spacer. 46 and 47 are receiving types.

In draw forming, in order to increase the flexibility of the base paper used as a blank, the mold used for forming is heated to 100 ° C. or higher. For this reason, the laminating material is not general low density polyethylene (LDPE),
For example, PP. It is more desirable to use a heat-resistant resin having a softening point of 150 ° C. or higher, such as polymethylpentene (TPX), polybutylene terephthalate (PBT), and polyethylene terephthalate (PET).

<Embodiment 2> The same as Embodiment 1 except that the structure of the blank is changed as follows. Material composition: (Inner surface) Polybutylene terephthalate (PB
T) 30 μm / cup base paper 265 g / m ² / (printing) PP
20 μm In this example, by using the heat-resistant resin polybutylene terephthalate (PBT), the mold temperature of the PBT contact surface could be raised to 200 ° C., and stable molding without paper breakage during molding was possible.

<Other Embodiments> FIG. 6 (a) is a plan view showing an embodiment of a triangular lid, FIG. 6 (b) is a side view thereof, and FIG. 7 (a).
Is a plan view showing an embodiment of a hexagonal lid, (b) is a plan view thereof,
FIG. 8A is a plan view showing an embodiment in which an embossed mark 50 is provided on the lid top surface of an octagonal lid, and FIG. 8B is a side view thereof. As shown in the above example, for the purpose of discriminating and distinguishing from other products, the lid is made into a deformable shape and a unique shape aiming at fashionability and distribution that are not just circular. We were able to.

Although the above description is based on the embodiment shown in the drawings, the present invention is not limited to the above embodiment. The length of the folded-back portion 13 is not particularly limited, but it is desirable that the length of the folded-back portion 13 is approximately half the length of the skirt portion 12 in the vertical direction for fitting with the cup container 30. It is also possible to bond the skirt portion and the folded portion by preheating with a hot air device or the like at the same time as this folding process is performed.
When the skirt portion is folded inward, it is preferable that the skirt portion 12 and the folded portion 13 of the lid are heat-bonded (heat-sealed) by heating with a hot air heater or the like.

[0029]

According to the present invention, it is possible to easily manufacture a highly fashionable polygonal paper cover lid by drawing a single paper blank by pressing.
Further, the entire circumference of the skirt portion of the cover lid has a double-structured ring shape by folding back the end edge inward, so that the strength is high and deformation of the skirt portion due to product pressure or external pressure is suppressed. Further, by folding back the edge of the skirt portion inward, the skirt portion can be closely fitted when it is attached to the cup container. Furthermore, since the folded-back portion inside the skirt can be locked to the curl portion of the cup container, it is possible to prevent the cover lid from coming off easily from the cup container, so that the contents of the cup container to be adhered can be surely protected. Further, by folding back the edge portion inwardly, there is a practical effect that moisture absorption from the edge portion into the paper layer can be suppressed to a low level. In addition, when the top plate of the cover lid is raised upward to form a protrusion, there is an advantage that the strength of the top plate is also improved.Furthermore, the suitability for stacking the cup containers when stacking and displaying the cup containers at the store front is improved. There is an advantage that the bottom part of the upper container and the plate-like protrusion of the lower container are intermeshed with each other, and the upper and lower containers can be stacked without misalignment. Further, the cover of the present invention can be easily printed beautifully on the top surface or the skirt by offset printing or the like, or a print display or an embossed marking, and can be separated into paper and plastic at the time of disposal. There is an advantage that it is not necessary to carry out the recycling process together with the paper container.

[Brief description of drawings]

FIG. 1 shows an example of a rectangular cover lid with R,
(A) is a top view which looked at the inside of a lid, (b) is a side view which notches and shows a part.

2A and 2B are diagrams showing a state in which the cover lid is attached to the upper surface of the cup container, FIG. 2A is a side view, and FIG. 2B is a partially enlarged sectional view thereof.

FIG. 3 is a plan view showing an example of a paper blank used for a cover.

FIG. 4 is an image view showing a manufacturing process by drawing a cover lid.

FIG. 5 is an explanatory diagram of a split seal type.

FIG. 6 (a) is a plan view showing an example of a triangular lid, (b).
Is a side view thereof.

FIG. 7 (a) is a plan view showing an example of a hexagonal lid, (b).
Is a side view thereof.

FIG. 8 (a) is a plan view showing an example of marking on the lid top surface of an octagonal lid, and FIG. 8 (b) is a side view thereof.

[Explanation of symbols]

10 Cover lid 11 Top plate 11a protrusion 12 Skirt 13 Folding part 20 blank 30 cup container 31 Curl flange 40 Lower type (female type) 40a fixed lower mold 40b movable lower mold 41 blank holder 42 Upper type (male type) 43 Edge bend type 44 split seal type 45 spacer 46,47 Receiving type

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 3E060 BA24 DA30 EA02 EA06 EA13                 3E062 AA03 DA02 DA08                 3E084 AA05 AA13 AA15 AA34 AB06                       BA01 CC07 CC08 DA02 DA10                       DB13 DB17 DC07 DC08 FA09                       FC07 GB16 LB02 LB08 LB09                 4F100 AK01B AK07 AK08 AK42                       BA02 BA03 BA10B DB07                       DG10A GB18 GB23 HB21A                       JA04B JA13A JB16B JL05                       JL12A JL16 YY00A YY00B

Claims (7)

[Claims] 1. A blank mainly consisting of a sheet of paper is used, and a top plate portion of a lid member and a skirt portion are integrally formed by drawing from a peripheral edge of the top plate portion in a substantially vertical direction. A polygonal cover, wherein the skirt portion is folded inward from a lower end portion thereof and has a double structure over at least half the height of the skirt portion. 2. The top plate portion of the lid member is formed with an annular flat surface portion and a protrusion protruding in a plateau shape inside the annular flat surface portion. Polygon cover. 3. The polygonal cover according to claim 2, wherein an embossed marking is provided on a central protruding portion of the cover material. 4. The folded-back portion, which is bent inward at the end of the skirt portion, covers the entire inner surface of the skirt portion,
The polygonal cover according to claim 1, wherein the cover is heat-sealed or glued. 5. The polygonal cover according to claim 1, wherein the blank is formed by laminating a thermoplastic synthetic resin layer on at least one surface of a paper layer. 6. The softening point of the thermoplastic synthetic resin layer is 1
The polygonal cover according to claim 5, which is composed of a thermoplastic synthetic resin layer having a temperature of 50 ° C or higher. 7. The polygonal cover according to claim 1, wherein the paper layer constituting the main body of the paper lid member is formed of a cup base paper having a basis weight of 100 to 350 g / m ^2. .