JP2012236649A - Depression absorbing paper cup - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a depression absorbing paper cup which decreases a visual feeling of strangeness with respect to a depression formed on a container after a liquid is heated to fill a paper cup.SOLUTION: In the depression absorbing paper cup used for warming and filling of a liquid, a plurality of regular flat areas are formed on the side face of the cup to form regions structurally easily depressed and to guide the positions where depressions, thereby alleviating a visual feeling of strangeness. Supposing that a face where the regular flat area is formed when a roughly conical trapezoid container is cut on its flat face is a unit flat face, the unit flat face is rotated by 90° each around the conical axis of the container for forming four faces in symmetry.

Description

  The present invention relates to a paper cup, and more particularly to a dent-absorbing paper cup in which side dents are not noticeable when hot filling is performed.

  Most conventional paper cups are frustoconical cups formed from a body blank punched into a fan shape and a circular bottom plate. The molding is performed by winding a trunk blank around a core having a conical curved surface, pasting the trunk, supplying a bottom plate, double seaming to form the bottom, and finally performing top curling.

  When such a frustoconical paper cup is filled with liquid HOT to obtain a product, the pressure in the container head space decreases when the temperature in the container decreases after sealing with a lid after filling. Since a paper container does not necessarily have sufficient rigidity, a dent may occur on the surface of the container due to a decrease in internal pressure. Since the consumer is aware that the circular shape is a normal shape, a product with a dent in the container may give the consumer the impression of a defective product, which may lead to a decline in purchase motivation.

Further, in the current frustoconical paper cup, there is no difference in strength depending on the part because of the circular cross-section of the side surface, and therefore the positions where the dents are generated are scattered and not constant.
Paper cups having shapes other than the frustoconical shape have been studied for several applications.

  For example, in Patent Document 1, a material in which a plastic resin layer is not provided in advance is used, and after forming into a paper cup shape, an inner surface protective film layer is provided on the inner surface of the mold with a thermoplastic resin film. In this method, a polygonal paper cup having a unique shape in which the bottom surface is polygonal and the opening surface is circular has been proposed, and a method for manufacturing the same. Thereby, it is said that the innovation of the form of the paper cup and the improvement of the molding process can be achieved.

  Further, in Patent Document 2, as a heat-insulating heat insulating container having a shape that is easy to be molded using general paper or paperboard and the heat insulating air layer between the outer paper and the cup is not easily crushed, a truncated cone In a paper cup in which a paper sack is wrapped around the outer surface of the body of a shaped paper cup and the cup body is made into a double structure, a paper sack made of paper or paperboard punched out in a substantially fan shape is placed on the outer surface of the body of the paper cup When winding, a large number of polygonal or lens-shaped unit surfaces separated by straight or arc-shaped ruled lines are connected between the upper and lower edges of the fan-shaped paper or paperboard. Once formed, the whole is sacked and wound around the outer surface of the cup body. Between the unit surface of the sack and the cup body surface inside the sack, an insulating air layer consisting of a substantially triangular truss structure or arch structure is formed. Made, large paper basis weight Without the use of special paper base to maintain a heat insulating air layer, there is a good thermal insulation, thermal insulation can be imparted.

  Furthermore, in Patent Document 3, for the purpose of providing a circular paper cup that is easy to apply a label on the curved surface of the circular cup and is easy to see the label on the curved surface of the circular cup, at least one place on the curved surface of the side surface of the frustoconical cup is provided. A paper cup provided with a flat portion for labeling has been proposed.

However, the method proposed in the above-mentioned literature cannot solve the dent in the container that occurs when a paper cup is filled with liquid HOT to produce a product.
The dent is generated in a weak portion of the container structure. In particular, in the case of a container having a polygonal cross-sectional shape, the shape of the dent is an oval shape that maximizes the amount of dent in the center of gravity of each surface.
Generally, if the rigidity of the paper is increased in order to suppress “dents”, the paper becomes difficult to deform. There is a way to increase the paper basis weight to increase the paper rigidity. However, this measure has the problem that not only the purpose of resource saving can not be achieved, but also when blanks are formed, the paper is too thick and difficult to form, and the paper breaks and looks bad.
As a means of demonstrating rigidity without increasing the weight of the paper, it is possible to reduce the amount of used paper or use pulp such as high strength UKP (unbleached kraft pulp) without blending, but paper strength In the case of increasing the thickness, the paper is too hard as in the case where it is too thick, and it is difficult to form the paper.
Furthermore, in the step of bonding the body member in a cylindrical shape, when the bonded portion is formed of a curve or a plurality of straight lines, there is a problem that sagging or tension occurs during bonding, resulting in poor adhesion and leakage of contents.

  As described above, there is a limit to the selection of cup base paper that has both the ease of molding and the rigidity that does not cause dents when filling HOT, and there is a method that can make dents inconspicuous using common paper and paperboard. It was desired.

JP 2000-238758 A Japanese Patent No. 4143781 JP-A-9-193919

  To provide a dent-absorbing paper cup that reduces the visual discomfort of the container dent that occurs during hot filling of the paper cup.

  As a result of intensive studies on the above problems, the present inventors have reduced the degree of visually uncomfortable feeling even when a dent occurs, so that the position and shape of the dent are regular. The inventors have found that a place where a dent is generated can be induced by creating a portion (planar region) having a weak structure on the side surface at a symmetrical position, and the present invention has been achieved.

  That is, according to the first aspect of the present invention, in the paper cup used for warming and filling the liquid, by forming a plurality of regular flat regions on the side surface of the paper cup, a structurally easy-to-dent portion is created and the occurrence of the dent is generated. A dent-absorbing paper cup characterized in that the position is guided to reduce visual discomfort.

  The invention according to claim 2 is that a plurality of regular planar regions have a unit plane as a plane created when a substantially frustoconical container is cut by a plane, and the unit plane is centered on the central axis of the container cone The dent-absorbing paper cup according to claim 1, wherein the four surfaces are provided symmetrically by being rotated 90 degrees each. In this way, it can be made into a shape that does not feel unstable when placed and does not feel uncomfortable in design.

  The invention according to claim 3 is the dent absorbing paper cup according to claim 1 or 2, wherein the height of the unit plane is ½ or more of the height of the paper cup. By setting it to 1/2 or more of the height of the paper cup, it is possible to secure a plane having a sufficiently large area for preventing the depth of the recess from becoming large.

The invention according to claim 4 is the dent absorbing paper cup according to any one of claims 1 to 3, wherein the height of the unit plane is 4/5 or less of the height of the paper cup.
By setting the height from the upper part of the unit plane to the circular part on the top side to be 1/5 or more of the height of the paper cup, the formability at the time of top curl can be ensured.

The invention according to claim 5 is such that the outer peripheral length of the container body in a horizontal cross section of an arbitrary height is the same as the outer peripheral length of the container body in a horizontal cross section of the same height in the case of a conical cup. The dent-absorbing paper cup according to any one of claims 1 to 4, wherein a size of the body member is set.
Thereby, the shape of a trunk | drum member blank becomes a fan shape, and a trunk | drum side surface bonding part becomes a straight line. Therefore, leakage of contents from the bonded portion can be prevented without causing tension or sagging in the bonded portion.

The invention according to claim 6 is characterized in that the plurality of regular planar regions are partitioned by one or more oval or triangular ruled lines. It is a dent absorption paper cup of description.
By providing a ruled line of the target shape obtained by cutting a single or multiple oval shape or oval shape with a straight line in the portion below the height of the planar portion of the body member, the occurrence of dents at the time of filling is guided, and regular It makes it easy to make a dent.

In the dent-absorbing paper cup according to the present invention, the side portion of the liquid paper container is partially provided with a flat surface portion to create a structurally weak portion, thereby inducing the occurrence of the container dent.
Further, since the container dent is generated in a symmetrical part on the side surface of the container, it is possible to give the consumer a recognition that the dent is a design, and the uncomfortable feeling of the hot filling dent is reduced.
As a result, it is possible to prevent a decrease in the consumer's willingness to purchase due to recognizing the container dent as defective, and an increase in sales can be expected.

It is the outline appearance figure showing the example of the paper cup of the present invention typically. It is explanatory drawing of the plane formed in the paper cup of this invention. It is explanatory drawing of the shaping | molding method of the paper cup of this invention. (A) is a schematic cross-sectional view showing the relationship between the upper die and the lower die centered on the caliber portion, and (b) is an enlarged view of the K portion to which paper is added. It is explanatory drawing of the shaping | molding method of the paper cup of this invention. (C) is a schematic cross-sectional view taken along line C-C 'in FIG. 3, and (d) is a schematic cross-sectional view taken along line D-D' in FIG. It is the external appearance schematic which represented the example of the conventional paper cup typically. The top is a plan view seen from above, and the bottom is a front view seen from the side. 2 is a schematic cross-sectional view of a cup shape (b) according to the present invention and a general frustoconical cup shape (a). 1 is a schematic diagram of a blank shape of a cup (b) according to the present invention and a general frustoconical cup (a). It is the cup schematic which put the ruled line in the plane part. (A) is a case where the upper side is a circular cup and the lower side is a rectangular cup, (b) is a case where an oval ruled line is inserted, and (c) is a case where a ruled line is formed by cutting the oval shape with a straight line.

The present invention will be described in more detail with reference to the drawings. For comparison, FIG. 5 shows a plan view and a side view showing an external appearance of an example of a conventional frustoconical paper cup (20).
The surface of the body (1) of the cup (20) forms a conical curved surface, and the radius of curvature of the body section decreases as it moves from the caliber (2) at the top to the bottom (3), but the shape of the cross section Is circular and constant.

  Therefore, the force in the cup center direction applied to the body part (1) caused by the temperature drop after heating and filling the contents is substantially the same at any position in the circumferential direction, and the body part (1 ) Will be disjointed. In addition, it is difficult to predict the position in the height direction of the dent due to the force in the cup center direction applied to the body (1).

1 and 2 are explanatory views of a dent absorbing paper cup (10) according to the present invention.
FIG. 2A shows a unit plane (4a) having a height A, which is generated by cutting a portion below the surface of the conical body (1) with a plane (4). FIG. 2B shows a unit plane (5b) having a height B, which is generated by cutting one place above the surface of the conical body (1) with the plane (5).

FIG. 1 (a) shows a dent absorption according to the present invention formed by replacing the unit plane (4a) of FIG. 2 (a) with a conical surface of the body part (1) at four positions symmetrical about the central axis of the cone. 1 is a schematic external schematic view of a paper cup (10). Similarly, FIG. 1 (b) replaces the unit plane (5b) of FIG. 2 (b) with the conical surface of the body (1), and is formed at four locations symmetrical with respect to the central axis of the cone. 1 is a schematic external schematic view of a dent absorbing paper cup (10).
Each of the paper cups in FIGS. 1A and 1B is formed in a body portion (1) at a position where four unit planes are separated from each other by 90 degrees in the circumferential direction of the cup at a central angle.

  As described above, the dent-absorbing paper cup of the present invention creates a part that is structurally easily dented by forming a plurality of regular planar regions on the side surface of the paper cup in the hot-filling of the liquid. A plane formed by cutting a substantially frustoconical container with a plane, the unit plane being a unit plane, and the unit plane being 90 around the cone central axis of the container body This is a paper cup in which four surfaces are provided symmetrically at a position rotated by degrees.

  Further, a plane having a sufficiently large area for preventing the depth of the recess from becoming large when the height (A) or (B) of the unit surface is not less than ½ of the height of the paper cup (10). Can be secured.

  Further, the height (A) of the unit plane is 4/5 or less of the height of the paper cup, that is, the height from the upper part of the unit plane to the circular portion on the top side is set to 1/5 or more of the height of the paper cup. Therefore, the moldability at the time of top curl can be ensured.

  As a constituent material of the dent absorbing paper cup of the present invention, generally a laminate in which a sealant layer is laminated on a paper base material such as a cup base paper is used, and further, a laminate having a barrier property, a design property, etc. if necessary. Used.

As the paper substrate constituting the laminate, a paperboard such as a cup base paper is usually used. Although the basis weight and density is appropriately selected depending on vessel capacity and design, usually density 0.8 before and after the cup base paper is often used in a range of basis weight ^{200g / m 2 ~500g / m 2} .

  As the barrier layer, a stretched or unstretched plastic film such as polyester resin, polypropylene resin, polyamide resin, etc., polyvinyl alcohol is applied to various plastic films, metal such as aluminum, or metal oxide such as silicon oxide. A processed film on which a thin film is deposited, and aluminum foil can be applied. In this case, it is appropriate that the film thickness is 6 μm to 25 μm and the thickness of the vapor deposition layer is about 5 nm to 100 nm.

On the other hand, as an adhesive layer used for adhesion of each layer constituting the laminate, a dry laminate adhesive layer made of an isocyanate compound is typically mentioned. The coating amount of the adhesive is suitably about 0.5 to 5.0 g / ^{m 2.}

On the other hand, the sealant layer is a layer made of polyethylene resin or polypropylene resin. Specifically, high density polyethylene resin, low density polyethylene resin, linear low density polyethylene resin, medium density polyethylene resin, ethylene-based resins such as ethylene-α olefin copolymer, and homo-block / random polypropylenes Resins, propylene resins such as propylene-α olefin copolymers, ethylene-α, β unsaturated carboxylic acid copolymers such as ethylene-acrylic acid copolymers and ethylene-methacrylic acid copolymers, ethylene-acrylic acid Esterified products of ethylene-α, β-unsaturated carboxylic acid copolymers such as methyl, ethylene-ethyl acrylate, ethylene-methyl methacrylate and ethylene-ethyl methacrylate, and carboxylic acid sites were crosslinked with sodium ions and zinc ions, Ionic cross-linked product of ethylene-α, β unsaturated carboxylic acid copolymer, Epoxy compound modification such as acid anhydride-modified polyolefin resin, ethylene-glycidyl methacrylate copolymer represented by terpolymer such as tylene-maleic anhydride graft copolymer and ethylene-ethyl acrylate-maleic anhydride A single resin or a blend of two or more resins selected from polyolefin resins and ethylene-vinyl acetate copolymers are provided.
In particular, a linear low density polyethylene resin is preferred as the polyethylene resin. The thickness of the sealant layer is not particularly limited, but usually a range of 30 μm to 100 μm is frequently used.

  The printing ink layer provided as needed on the cup surface is a layer containing a pattern, product information, and the like that can be applied by a method such as gravure printing using a known ink. When a polyolefin-based resin is used as the thermoplastic resin layer, an easy adhesion treatment such as a corona treatment is usually performed on the surface in order to improve the adhesion of the ink.

  The lid that seals the cup after filling the contents may be a laminated material mainly made of paper, but it requires a peel layer that can be attached to the flange and peels off the flange with an appropriate strength. It is desirable to use a non-stretched polypropylene resin of a low peel strength type in which an appropriate amount of a polyethylene resin and a low density polyethylene resin are blended, and a sticking method by heating.

  As mentioned above, although the laminated body used for the dent absorbent paper cup which concerns on this invention was demonstrated, these laminated bodies are not limited to the thing of the above structures, In consideration of the use as a packaging material, as a packaging material For the purpose of improving required rigidity and durability, a configuration in which another layer is interposed may be used.

Hereinafter, a method for forming a dent-absorbing paper cup according to the present invention will be described. FIG. 3 is an explanatory view of an example of a method for forming a dent-absorbing paper cup according to the present invention. FIG. 3A is a schematic cross-sectional view showing the relationship between the upper die and the lower die centered on the aperture portion, and FIG. 3B is an enlarged view of the K portion.
The paper cup formed into the bottom by the usual method is then curled on the top of the body (1). This curling process is basically performed by an upper curl mold (11) and a lower curl mold (12) as shown in FIG. If necessary, a Teflon (registered trademark) processed curl holder (13) may be used.

  As shown in FIG. 3 (a), the cup body (1) which is affixed to the body has a cross-sectional shape cut along the line DD 'in FIG. 3 (a) as shown in FIG. 4 (d). As shown in FIG. 4 (c), the tip of the upper die (11) having a cross-sectional shape cut along line CC ′ in FIG. 3 (a) is fitted into the lower die (12). Is pressed to be curled. In this case, it is common to perform the first stage molding with an upper mold (11) with a large radius, and then switch to the upper mold with a smaller radius to perform the second stage molding.

In the portion K of FIG. 3A, curl molding is performed in a state where the mold clamping is performed. FIG.
) Is an enlarged view of the K portion, and shows a state in which the curl molding is substantially completed by the second upper mold (11). According to the above method, the concave absorbent paper cup (10) having the unit planes (5b) at four places in the circumferential direction at the upper part of the trunk is obtained when the curl forming is completed.
Further, in a state in which the paper cup is pushed into the retainer from above, it is common to press the heating plate from above to crush the curl of the caliber portion and to thermocompress it into a flat flange shape.

  Factors affecting the superiority or inferiority of the shape retention of the cup include the material of the cup in addition to the shape of the curl mold and retainer. In general, the shape-retaining property is better when aluminum foil 7 to 20 μm is laminated than a laminated body made only of cup base paper and low-density polyethylene. There are also some differences due to the cup base paper itself. Further, it varies depending on the above-mentioned curl molding conditions or flange molding conditions among the manufacturing conditions.

Moreover, the outer peripheral length of the container trunk | drum in the horizontal cross section of the arbitrary height becomes the same as the outer peripheral length of the container trunk | drum in the horizontal cross section of the same height in the case of a cone-shaped cup. Thus, it is a dent absorbing paper cup in which the dimensions of the body member are set.
FIG. 6 is a schematic external view of a cup shape (b) according to the present invention and a general frustoconical cup shape (a). FIG. 7 is a schematic external view of a blank shape of a cup (b) according to the present invention and a general frustoconical cup (a).

The paper cup according to the present invention shown in FIG. 6B is compared with the general frustoconical paper cup shown in FIG. 6A, the outer peripheral length LT of the top portion, the outer peripheral length LB and the height H of the bottom portion. Are the same, the outer peripheral length L2 of the cross section cut at a horizontal plane of an arbitrary height h is always equal to the outer peripheral length L1 of the cross section at the same height of a general frustoconical cup.
The paper cup according to the present invention has a height h as shown in FIG. 6B, as compared to the paper cup shown in FIG. The cross section at a position smaller than H1 is a square with a corner, but the outer peripheral length of the cross section at the same height is the same as that of the paper cup of FIG.

  By doing in this way, the shape of a trunk | drum member blank becomes a fan shape, and a trunk | drum side surface bonding part becomes a straight line. FIG. 7 is a schematic diagram comparing the paper cups shown in FIGS. 6A and 6B with respect to the shape of the trunk member blank.

  FIG. 7A shows an outline of the shape before molding of the body member blank (1a) corresponding to the general frustoconical paper cup shown in FIG. 6 (a) and the bottom member (3a) forming the bottom. . The bottom member (3a) is a circular laminated body, and the body member (1a) is a fan-shaped laminated body. The body member (1a) is further provided with an adhesive margin (8) used for bonding both end portions when molded into a cylindrical shape at one end portion, and the upper end portions of both are provided with a step when the top curl is performed. A top notch (6) for reduction and a bottom notch (7) for reliably sealing the end face are provided at the lower end of the adhesive margin.

An example of a forming method for forming a paper cup using the body member blank (1a) and the bottom member (3a) shown in FIG. This molding method is the same as in the case shown in FIG.
The side edge provided with the folded resin portion of the end surface of the body member blank is set to the inner surface side and overlapped with the other side end edge to form a body portion bonding portion to obtain a cylindrical body member.
The outer surface of the periphery of the bottom member (3a) is joined to the lower inner surface of the body member (1a), and the lower end edge of the body member (1a) is folded inward so as to cover the periphery. An annular leg is formed by joining to the inner surface of the peripheral edge.
Finally, the upper periphery of the body member (1a) is wound outward one or more times, and the caliber portion (flange portion) (
2) to form a paper cup.

As described above, the flange portion (2) is not limited to a configuration in which the upper peripheral edge is wound outward one or more times, and further, the upper surface may be flattened by pressing the flange portion from above and below.
Here, since the body member (1a) uses the body member blank which provided the notch part (6) in the both-sides edge upper part, respectively, the upper periphery of the body member (1a) is wound outward one or more times. Thus, when the flange part (2) is formed, the paper base is also in the overlapping state similar to the part other than the above-mentioned bonding part in the bonding part (8), so the step of the flange part is eliminated. can do.
Further, if the shape of the notch (6) is different, the step generated on the upper surface of the flange can be eliminated even if the upper surface of the flange (2) is flat.

  In particular, as the notch (6), the width of the notch at the side end provided with the resin part is larger than the width of the notch at the other side end or the side end provided with the resin part. By making the height of the notch portion of the edge smaller than the height of the notch portion of the other side edge, even if the upper surface of the flange portion (2) formed by winding the upper end edge more than once is made flat, The level | step difference which arises on a flange part upper surface can be eliminated reliably.

The body member (1a) forming the paper cup is composed of a paper layer having a bottom notch (7) at the lower end of the side end that is the inner side of the body bonding portion, and a thermoplastic resin layer provided on the inner surface thereof. However, the resin part extended from the inner side edge of the paper layer containing the said bottom part notch part (7) is formed.
In this way, by using the body member that forms the covering portion that covers the side edge portion edge that becomes the inner side by the resin portion that extends from the inner edge of the paper base material including the bottom notch portion (7), By forming the paper cup, the edge of the paper layer is reliably protected, and the resin amount of the resin portion in the bottom notch (7) is increased, so that a structure without a gap can be reliably obtained in the bottom molding. .

  By using the body member having such a shape, when the paper cup as shown in FIG. 6 is formed, the notch portion of the body portion bonding portion of the annular leg portion is formed to extend from the inner edge. Therefore, there is no level difference, the molding state without gaps is stabilized, the pressure unevenness is reduced, and the annular leg portion having a stable shape and good appearance can be molded.

The paper cup manufactured from the blank shown in FIG. 7A has a circular cross-sectional shape cut at a plane of arbitrary height, and the outer peripheral length also changes in proportion to the height from the bottom to the caliber. Therefore, there is no problem caused by the change in the outer peripheral length depending on the height, and the joining portion end portion of the end face of the body member is automatically converted into a simple straight line.
On the other hand, especially in the case of a paper cup in which the shape of the cross section cut at a plane of arbitrary height is various and the outer peripheral length does not change proportionally with respect to the height from the bottom to the caliber, particularly There may be a problem that the shape of the joint portion of the member is deformed due to a partial tension due to a curved line or a plurality of straight lines, a shift due to stress, or the adhesive surface is peeled off.

Regarding this problem, the paper cup according to the present invention has a square shape with a square in the cross section at the position where the height h is smaller than H1 as shown in FIG. 6B, but the cross section at the same height. 6 (a) is the same as the paper cup in FIG. 6 (a). Therefore, as shown in FIG. 7 (b), the body member blank has a sector shape and the body side surface bonding portion is in a straight line.
Thus, according to the dent absorption paper cup of this invention, the leakage of the content from a bonding part can be prevented, without producing tension and sagging in a bonding part.

In the dent absorbing paper cup of the present invention, a plurality of regular plane regions are partitioned by one or more oval or triangular ruled lines, thereby guiding the dent position to a predetermined position more reliably. It is a paper cup that can be done.
The dent is generated in a weak portion of the container structure. In particular, in the case of a container having a polygonal cross-sectional shape in the height direction, the shape of the recess is an oval that maximizes the amount of recess at the center of gravity of each surface. Therefore, by providing a ruled line near the outer periphery of the oval area, the position of the recess can be more reliably guided to a predetermined position.

FIG. 8 shows a schematic view of a paper cup with ruled lines in the plane portion.
FIG. 8A is a diagram showing the appearance of the upper caliber portion (2) in a circular shape and the lower bottom portion (3) in a state where no ruled line is formed in a rectangular paper cup. The height (H1) of the region (4a) is set to be larger than ½ of the height (H) of the paper cup and smaller than 4/5.
FIG. 8 (b) shows a case where an oval ruled line (9) having a height Hr is inserted in the plane area (4a) of the paper cup of FIG. 8 (a), and FIG. 8 (c) shows the oval shape. The figure shows a case where a ruled line (9 ′) having a shape obtained by cutting a line with a straight line is inserted.
The shape of the ruled line formed in the planar region is an oval shape, which comes from the distribution of the dent amount at the center of gravity of each surface, and may be a partial oval shape or a triangular shape.

In both the cases of FIG. 8B and FIG. 8C, the height Hr of the ruled line portion is set to be equal to or less than the height H of the planar area, and the contour of the dent shape is easy to guide. Yes.
As a result, there is little variation in the position and shape of the dent generated in the body portion of the paper cup, and the position is fixed at a regular position, so that it is possible to prevent the consumer from deteriorating in purchasing due to recognizing the container dent as defective. So sales can be expected to improve.

As an example of an embodiment of a dent absorbing paper cup according to the present invention, two types of paper cups created with the following specifications and manufacturing conditions were compared.
<Example 1>
An oval ruled line having a height of 50 mm shown in FIG. 8B is formed on the body member blank and the bottom member of the shape shown in FIG. 7B, which are prepared using the following cup base paper and polyethylene resin laminate. After that, a paper cup was formed by molding under the following specifications and conditions.
Cup base paper (215g / m ^2, made by Daishowa Paper Co., Ltd.) / Polyethylene layer (15μm)
Cup internal volume: 200 ml Height: 80.5 mm Diameter: 74 mm Circular curl width: 2.8 mm Flange width: 2.65 mm
Curl winding condition: 1st curl 0.5 sec. Second curl 0.5 sec. Upper mold temperature 90-100 ℃
Flange molding conditions: Heat plate surface temperature 200 ° C. Heat-bonding time 1.1 sec. Pressure 50 kg / cm ²

<Comparative Example 1>
The body member blank and bottom member having the shape shown in FIG. 7 (a), which was prepared using the following cup base paper and polyethylene resin laminate, were molded under the following specifications and conditions to produce a paper cup having the shape shown in FIG. .
Cup base paper (215g / m ^2, made by Daishowa Paper Co., Ltd.) / Polyethylene layer (15μm)
Cup internal volume: 200 ml Height: 80.5 mm Diameter: 74 mm Circular curl width: 2.8 mm Flange width: 2.65 mm
Curl winding condition: 1st curl 0.5 sec. Second curl 0.5 sec. Upper mold temperature 90-100 ℃
Flange molding conditions: Heat plate surface temperature 200 ° C. Heat-bonding time 1.1 sec. Pressure 50 kg / cm ²

Boiling water was poured into two types of paper cups molded under the above conditions, sealed with a lid, and stored at room temperature for 24 hours. As a result, the cup of Example 1 had a slightly flat oval shape on its barrel. It was recessed. Moreover, the cup of the comparative example 1 was unsightly because its trunk was irregularly recessed.

The dent of the cup of Example 1 was slight, and the portions surrounded by the four oval ruled lines were evenly recessed, so that it was indistinguishable from the container design.
On the other hand, in the paper cup of Comparative Example 1, the dent of the container was clearly recognized. In the cup of Example 1, it becomes possible to give the consumer a perception that the dent is a design, thereby reducing the uncomfortable feeling of the hot filling dent, and thereby the consumer's willingness to purchase by recognizing the container dent as defective. It seems that it was possible to prevent the decline of

  The method of the present invention can be applied not only to a paper cup but also to a general liquid paper container when it is required to make the appearance change of the liquid container whose internal pressure fluctuates after filling inconspicuous.

DESCRIPTION OF SYMBOLS 1 ... Body part 1a ... Body part 2 ... Diameter part 3 ... Bottom part 3a ... Bottom member 4 ... Plane 4a ... Unit plane 5 of height A ... Plane 5b ... Unit plane 6 of height B ... Body member top notch part 7 ... Body member bottom notch 8 ... Glue 9 ... Rule 9 '... Rule 10 ... Dent absorbing paper cup 11 ... Curl upper mold 12 ... Curl lower mold 13 ... Curl mold retainer 20 ... Conventional paper cup H ... Paper cup height H1 ... Height of unit plane H2 ... Height of paper cup-Height h of unit plane ... Height from the bottom of the horizontal section LT ... Diameter section LB ... Bottom section L1 ... Paper cup section L2 at height h ... Height Paper cup cross section at h

Claims (6)

  In a paper cup used for warm filling of liquid, a plurality of regular planar regions are formed on the side of the paper cup to create a structurally easy-to-dent part, and the position of the dent is induced to reduce visual discomfort. A dent absorbing paper cup characterized by that.   A plurality of regular plane regions are formed by cutting a substantially frustoconical container by a plane, and a plane is formed by rotating the unit plane 90 degrees about the cone central axis of the container to obtain four planes. The dent absorbing paper cup according to claim 1, wherein the dent absorbing paper cup is provided in a symmetrical shape.   The dent-absorbing paper cup according to claim 1 or 2, wherein the height of the unit plane is ½ or more of the height of the paper cup.   The dent-absorbing paper cup according to any one of claims 1 to 3, wherein the height of the unit plane is 4/5 or less of the height of the paper cup.   The dimensions of the barrel member were set so that the outer peripheral length of the container body in the horizontal cross section at an arbitrary height was the same as the outer peripheral length of the container body in the horizontal section of the same height in the case of a conical cup. 5. A dent-absorbing paper cup according to any one of claims 1 to 4.   The recessed absorbent paper cup according to any one of claims 1 to 5, wherein the plurality of regular planar regions are partitioned by one or a plurality of oval or triangular ruled lines.

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