JP6131531B2 - Cup type paper container - Google Patents

Description

  The present invention relates to a paper container for storing food products, beverages, and the like, and particularly to a cup-shaped paper container suitable for cooking by a microwave oven.

  As containers for storing food and beverages, containers of various shapes and various shapes are used. In recent years, containers using paper, which is a reproducible resource, have attracted particular attention against the background of increasing awareness of global environmental protection. Among them, the cup-shaped paper container is widely used as a container for storing various foods, beverages and the like in addition to the original paper cup use because of its ease of use and ease of manufacture.

  As a general shape of a cup-shaped paper container, as shown in FIGS. 8 (A) and 8 (B), a bottom member (200) and a bottom member (300), which are formed in a reverse tray shape, are formed. The bottom sleeve (yarn) (250) is generally formed by winding the lower end of the body member (200) around the peripheral edge (310) of 300) and thermocompression bonding. The upper end portion of the body member (200) is crushed after wrap-up forming to form a flange portion (230), and a separately prepared lid member (not shown) is detachably sealed and sealed.

  When the contents are put into such a raised bottom paper container and heated in a microwave oven, the contents of the body member (200) are in direct contact with the contents, so that the temperature does not exceed 100 ° C., Since the portion of the bottom sleeve (250) is not in direct contact with the contents, depending on the characteristics of the microwave oven, the bottom sleeve (250) is heated to 100 ° C. or higher and “burned” (400) as shown in FIG. Occasionally, a phenomenon occurs.

  This is considered to be because cellulose contained in the paper is heated by the microwave of the microwave oven to generate heat. In many cases, there is a portion called a hot spot in which microwaves concentrate at a height of about 5 mm from the floor surface in the microwave oven, and this height corresponds to the height of the bottom sleeve (250). In addition, since the bottom sleeve portion folds the paper several times, the amount of paper is larger than the other portions, and the amount of heat generation is also increased.

  This “burning” phenomenon is related to the characteristics of the microwave oven and the location of the microwave oven, and does not always occur. It was also the reason why it could not be used.

  The microwave oven paper cup described in Patent Document 1 has been made to solve this problem, and in order to prevent the bottom sleeve from being formed, as shown in FIG. The bottom sleeve is not formed by forming (300) into a flat shape without forming a reverse tray, and folding the body member (200) into the bottom member (300) and only crushing it by 90 °. It is what I did.

  Since the microwave oven paper cup described in Patent Document 1 is likely to have wrinkles at the end (260) of the body member (200) bent to the bottom surface in FIG. 8 (D), the heat with the bottom surface member (300). There is a risk that the seal may be incomplete and cause leakage.

  The modified bottom paper cup described in Patent Document 2 is formed from a single blank, and is made for the purpose of a paper cup having stacking suitability that does not leak.

Japanese Patent No.3953584 JP 2003-341649 A

  The modified bottom paper cup described in Patent Document 2 is not specifically designed for heating by a microwave oven, but there is no fear of liquid leakage and there is no bottom sleeve unlike a normal paper cup. It is considered that there is a possibility of avoiding the problem of burning in

  However, the paper cup described in Patent Document 2 has a problem that the bottom of the paper cup overlaps very much because of its structure, so that the bottom surface is difficult to flatten, and when it is placed on a table, it has a problem that it is unstable. It was. Depending on the thickness of the paper, there is a possibility that scorching may occur due to heating of the microwave oven.

  The problem to be solved by the present invention is to propose a cup-type paper container that has good flatness on the bottom surface and hardly burns even when directly heated in a microwave oven.

As means for solving the above-mentioned problems, the invention according to claim 1 is a paper layer, a thermoplastic resin layer provided on both sides of the paper layer, and a paper layer corresponding to the inner surface side of the cup-type paper container. And an inorganic oxide vapor-deposited film provided between the thermoplastic resin layer and the body seal portion of one fan-shaped blank made of a laminate having a thickness of 0.6 mm or less is sealed. A cup-shaped paper container in which a vertical ruled line of a book is folded, a bottom part is folded, a lower part is rectangular, and an upper part is widened to form a body part,
The blank has a bottom surface portion and a bottom seal portion sequentially connected to the lower portion of the body portion via a ruled line, and the bottom surface portion has a bottom triangular plate whose long side is connected to the lower portion of the body portion, a bottom rectangular plate, A bottom folding plate connected to one side of the bottom rectangular plate and the short side of the bottom triangular plate is provided via a ruled line;
The cup-type paper container is characterized in that the ruled line forming the long side of the bottom triangular plate is a bottom corner offset ruled line that protrudes on the body side by an offset width corresponding to four sheets of the thickness of the laminate.

  The cup-type paper container according to the present invention is heated in a microwave oven because there is no bottom sleeve (thread twist) unlike the conventional cup-type container because the bottom of one blank is folded to form a flat bottom surface. Sometimes it is difficult to burn.

  In addition, when forming the bottom surface, the bottom surface corner crease that forms the long side of the bottom triangular plate, which is the crease line where the thickest part of the paper is desired in the bottom surface, protrudes to the body side by an offset width and escapes. Finished flat, increasing the stability and independence of the container.

  The invention according to claim 2 is the cup-type paper container according to claim 1, wherein the bottom corner offset ruled line is projected in an arc shape on the body side.

  The invention according to claim 3 is the cup type paper container according to claim 1, wherein the bottom corner offset ruled line is projected in a trapezoidal shape on the body side.

  The invention according to claim 4 is the cup-type paper container according to any one of claims 1 to 3, wherein the offset width is four sheets of the thickness of the laminate. is there.

  Since the cup-shaped paper container according to the present invention folds the lower part of one blank to form a flat bottom surface, there is no bottom sleeve. For this reason, when heated in a microwave oven, scorching is unlikely to occur.

  Also, when forming the bottom surface, the bottom corner offset ruled line, which is the crease line that wants the thickest part of the paper on the bottom surface, and the bottom corner ruled line that forms the long side of the bottom triangular plate, is projected to the body side by the offset width. By doing so, the bottom surface was finished flat, and the stability and independence of the container increased.

In addition, since the body portion and the bottom portion include a paper layer, there is an insulating property, and therefore, there is an advantage that a hand is not hot in handling during heating as compared with a metal can or a glass bottle.
In addition, when the thickness of the laminate is 0.6 mm or less, the total thickness of the bottom surface portion is 5 mm or less, which prevents the occurrence of scorching in relation to the height of the hot spot in a general microwave oven. The effect to do becomes high.

  When the bottom corner offset ruled line that forms the long side of the bottom triangular plate is an arc shape or a trapezoidal shape projecting on the body side as in the invention described in claim 2 or 3, the bottom surface can be molded smoothly. Can be.

  Further, as in the invention according to claim 4, when the offset width of the ruled line is four sheets of the thickness of the laminate, the moldability is the best.

FIG. 1 is a perspective view showing an embodiment of a cup-type paper container according to the present invention. FIG. 2A is a perspective view showing the cup-type paper container shown in FIG. 1 as viewed from below. FIG. 2B is a perspective view showing a state before the bottom rectangular plate (10) is folded. FIG. 3 is a schematic plan view showing the cup-shaped container blank shown in FIGS. FIG. 4 is a schematic cross-sectional view showing the X-X ′ cross section of FIG. FIG. 5 is a schematic cross-sectional view showing the Y-Y ′ cross section of FIG. FIG. 6 is an explanatory diagram of a bottom corner offset ruled line. FIG. 7 is an explanatory diagram of a bottom corner offset ruled line. FIG. 8A is a perspective explanatory view showing the structure of a conventional cup-shaped paper container. FIG. 8B is a schematic partial cross-sectional view of the paper container shown in FIG. FIG. 8C is a perspective view showing a state in which “burn” has occurred in the bottom sleeve portion. FIG. 8D is a schematic partial cross-sectional view of another conventional paper container having another shape.

The paper container according to the present invention will be described in detail with reference to the drawings.
FIG. 1 is a perspective view showing an embodiment of a cup-type paper container according to the present invention. In addition, FIG.
) Is a perspective view showing the cup-type paper container shown in FIG. 1 as viewed from below. FIG. 2B is a perspective view showing a state in which one bottom triangular plate (8) is opened. FIG. 3 is a schematic plan view showing a blank of the cup-type container shown in FIGS.
This will be described below with reference to these drawings.

  A cup-shaped paper container (1) according to the present invention comprises a body seal portion of a fan-shaped blank (BL) comprising a laminate having a paper layer and a thermoplastic resin layer provided on both sides of the paper layer ( 6) is sealed, the four vertical ruled lines (a, b, c, d) are folded, the bottom part (4) is folded to form a body part (3) with a rectangular lower part and an expanded upper part. It is a cup type paper container.

  The blank (BL) has a bottom surface portion (4) and a bottom seal portion (5) that are sequentially provided below the body portion (3) via ruled lines.

  The bottom surface portion (4) is connected to the bottom triangular plate (7, 8) whose long side is connected to the lower portion of the body portion, the bottom rectangular plate (9, 10), one side of the bottom rectangular plate, and the short side of the bottom triangular plate. The bottom folded plates (11, 12) are provided via ruled lines.

  In the cup-shaped paper container (1) according to the present invention, the ruled line forming the long side of the bottom triangular plate (7, 8) is a bottom corner offset ruled line (e, g) protruding from the body side by an offset width (OS). It is characterized by that.

  The cup-type paper container (1) according to the present invention has a flat bottom surface and does not have a bottom sleeve like a normal paper cup. For this reason, when heated in a microwave oven, scorching is unlikely to occur.

  The cup-shaped container (1) according to the present invention has a heat insulating property because at least the body (3) and the bottom surface (4) include a paper layer. Therefore, compared with a metal can or a glass bottle, There is an advantage that the hands are not hot in handling. There is also an advantage that the contents are difficult to cool.

  Further, when forming the bottom surface, the bottom corner offset ruled lines (e, g), which are the creased lines where the thickest part of the paper is desired, are protruded to the body (3) side by the offset width (OS) and escaped. The folding is stable, the bottom is finished flat, and the stability and independence of the container are increased.

  The molding procedure of the cup-type paper container according to the present invention will be described with reference to FIGS. The plan blank view of FIG. 3 is a view seen from the surface side of the laminate, which is the outside of the container. A solid line indicates an outline line, a thin solid line indicates a mountain fold ruled line, a one-dot chain line indicates a valley fold ruled line, and a dotted line indicates a ruled line that is folded in an intermediate process but not folded in a final finished state.

  First, a blank (BL) is wound and the left body seal portion (6) and the right end portion are overlapped and sealed to form a cylindrical body. In this example, the front and back surfaces of the left and right body end portions are sealed, but the back surfaces may be sealed together. By sealing the back surfaces together and then bending them along the body part, it is possible to make a structure in which the end of the laminate is not exposed on the inner surface of the container.

  Next, the bottom surface portion (4) is folded to form the bottom surface. First, bottom corner ruled lines (f, h), bottom corner offset ruled lines (e, g), trunk seal fold ruled lines (m), bottom fold ruled lines (n, o, p), bottom seal fold vertical ruled lines (u, v) Fold the mountain, and simultaneously fold the bottom triangular plate folding ruled line (i, j, k, l) to form the bottom while folding the bottom folding plate (11, 12) onto the bottom triangular plate (7, 8) To do.

  After the bottom seal portion (5) is joint-sealed, the bottom seal portion folding ruled line (r) is folded at 180 ° to bond the bottom seal portion to the bottom surface to obtain a flat bottom surface. At this time, the bottom rectangular plate (10) forms most of the bottom surface.

  FIG. 4 is a schematic cross-sectional view showing the X-X ′ cross section of FIG. This cross-sectional position is a position slightly deviated from the center of the bottom surface toward the bottom corner ruled line (f), and is the position where there is the most overlap of the laminates. In FIG. 4, eight laminates are laminated at the bottom corner offset ruled line (e), and seven laminates are laminated at the bottom corner offset ruled line (g).

  FIG. 5 is a schematic cross-sectional view showing the Y-Y ′ cross section of FIG. This cross-sectional position is also a position slightly deviated from the center of the bottom surface toward the bottom corner offset ruled line (e), and is the position where the stacks are most overlapped. In FIG. 5, a maximum of seven laminated bodies are laminated.

  The bottom corner crease (f, h) can be smoothly formed with a normal straight crease, but the bottom corner offset crease (e, g) has a large amount of stacking under the rule. Therefore, it is difficult to form a flat bottom surface with a normal straight crease line.

  As shown in FIGS. 6 and 7, the inventor extends the bottom corner ruled line to the body side by an offset width (OS) to form a bottom corner offset ruled line (e, g). It has been found that it can be easily molded.

  In the example of FIG. 6, the bottom corner offset ruled line (e) is an arc extending from a normal straight ruled line position. As for the offset width (OS), it was found that about 2 to 8 sheets of the thickness of the laminate is preferable, and about 4 sheets is the most preferable result.

  In the example shown in FIG. 7, the bottom corner offset ruled line (e) extends from a normal straight ruled line position into a trapezoidal shape. The optimum offset width (OS) in this case is the same as in FIG.

  In this way, in the paper container of this structure, since the stack of stacked bodies on the bottom surface portion is large, the conventional mechanical ruled line structure cannot form a flat bottom surface. Of the ruled lines, the flatness of the bottom surface is improved by using the bottom corner offset ruled lines (e, g) projecting to the body side, which are the long side positions of the bottom triangular plate (7, 8). Is found.

  The opening of the cup-shaped paper container (1) is usually curled and then crushed to form a flange (2). An arbitrary lid material can be heat-sealed to the flange portion (2) to form a sealed container. It may be used as a simple paper cup by holding the opening in a curled state without using the flange.

  As a laminate used for the cup-shaped paper container (1) according to the present invention, in addition to the one provided with the thermoplastic resin layer on the front and back surfaces of the paper layer, between the paper layer and the thermoplastic resin layer on the inner surface side of the container. Those provided with a gas barrier layer can also be used. The presence of the gas barrier layer improves the storage stability after the container is filled with the contents. By appropriately selecting the material of the gas barrier layer, a product that can be stored at room temperature for a long time can be obtained.

  The thickness of the laminate is preferably 0.6 mm or less in consideration of the stacking of the bottom surface. If the thickness of the laminate is 0.6 mm or less, the thickness of the bottom surface portion can be prevented from exceeding 5 mm which is the height of the hot spot in the microwave oven.

The paper layer, other conventional cup base paper, white cardboard, coated cardboard, the basis weight of 160g ^{/ m 2} ~400g ^/ m 2 about paper ivory paper, etc. can be used.

  As the thermoplastic resin layer, polyolefin resin is generally used. Specifically, low density polyethylene, medium density polyethylene, linear low density polyethylene, ethylene / vinyl acetate copolymer, ethylene / α olefin copolymer are used. Polymers, ethylene resins such as ethylene-methacrylic acid resin copolymers, blend resins of polyethylene and polybutene, homopolypropylene, propylene / ethylene random copolymers, propylene / ethylene block copolymers, propylene / α-olefins A polypropylene resin such as a copolymer is used.

  As a material for the gas barrier layer, it is preferable to use a material other than the metal foil, such as a gas barrier plastic film or an inorganic oxide vapor deposition film, on the premise of heating by a microwave oven.

  Examples of the gas barrier film include a polyvinylidene chloride film, a polyvinyl alcohol film, an ethylene vinyl alcohol copolymer film, a gas barrier nylon film, a gas barrier polyethylene terephthalate film and the like, a PET film and the like such as aluminum oxide and silicon oxide. An inorganic oxide vapor-deposited film on which an inorganic oxide is deposited, or a polyvinylidene chloride coating, a film containing a water-soluble resin and an inorganic layered compound, or a film obtained by reacting a metal alkoxide or its hydrolyzate with an isocyanate compound. A gas barrier coating layer such as a resin layer can be used.

  Hereinafter, although the paper container concerning the present invention is explained based on an example, the paper container concerning the present invention is not limited to these.

After printing a pattern on the surface of a cup base paper having a basis weight of 260 g / m ² , a laminate of (polyethylene 12 μm / silica vapor-deposited PET 12 μm / low-density polyethylene 60 μm) was adhered to the back surface, and then an extruder was used. A 20 μm thick medium density polyethylene (MDPE) layer was formed. A blank line as shown in FIG. 3 was created by putting ruled lines using a drawing die.

  The thickness of the laminated body was 0.4 mm, and the offset width in the blank was 0.8 mm.

  The bottom of the obtained blank was molded by a molding machine, and a cup-shaped paper container having a shape as seen in FIGS. 1 and 2 was produced.

  The paper container was placed on a normal cup filling line, the liquid was stored, and the lid was heat sealed.

  When the lid of the package was partially opened and heated by a microwave oven, the container did not rupture and did not burn.

  The structure of the laminated body was, in order from the inside, LDPE, 30 μm / 260 g cup base paper / silica vapor deposited PET, 12 μm / LDPE, 30 μm. A blank was prepared using this laminate, and a paper container having the structure shown in FIGS. In addition, as a cover material, the thing of the structure of LDPE, 30 micrometer / silica vapor deposition PET, 12 micrometer / stretched nylon, 25 micrometer / LDPE, 30 micrometer was used. The rest is the same as in the first embodiment.

  The container was aseptically filled with potage soup. The obtained package could be stored at room temperature, and when used, a part of the lid material was peeled off to open a vapor vent, and then it could be directly heated in a microwave oven. The container did not rupture or burnt.

DESCRIPTION OF SYMBOLS 1 ... Cup type paper container BL ... Blank 2 ... Flange part 3 ... Body part 4 ... Bottom part 5 ... Bottom seal part 6 ... Body part seal part 7, 8, ... Bottom triangle plate 9, 10 ... Bottom rectangular plate 11, 12 ... Bottom folded plate OS ... Offset width a, b, d, d ... Vertical ruled line f, h ... Bottom corner ruled line i, j, k, l: bottom triangle folded back ruled line e, g ... bottom corner offset ruled line m ... body seal part folded ruled line n, o, p ... bottom folded ruled line q, s ... bottom Folding ruled lines q ', s' with bottom seal part r ... Bottom seal part folding ruled line r' ... Bottom seal part ruled lines t, u, v, w ... Vertically folded bottom seal part Ruled line 200 ... body member 230 ... flange portion 250 ... bottom sleeve 260 ... leg portion 300 ... bottom member 310 ... Edge 400 ... burnt

Claims (4)

A paper layer, a thermoplastic resin layer provided on both sides of the paper layer, and an inorganic oxide vapor deposition film provided between the paper layer and the thermoplastic resin layer, corresponding to the inner surface side of the cup-type paper container , The body seal part of one fan-shaped blank made of a laminate having a thickness of 0.6 mm or less is sealed, the four vertical ruled lines are folded, the bottom part is folded, the lower part is rectangular, A cup-shaped paper container in which a body part with an expanded upper part is formed,
The blank has a bottom surface portion and a bottom seal portion sequentially connected to the lower portion of the body portion via a ruled line, and the bottom surface portion has a bottom triangular plate whose long side is connected to the lower portion of the body portion, a bottom rectangular plate, A bottom folding plate connected to one side of the bottom rectangular plate and the short side of the bottom triangular plate is provided via a ruled line;
A cup-shaped paper container characterized in that the ruled line forming the long side of the bottom triangular plate is a bottom corner offset ruled line that protrudes on the body side by an offset width corresponding to four sheets of the thickness of the laminate.   2. The cup-type paper container according to claim 1, wherein the bottom corner offset ruled line is projected in an arc shape on the body side.   The cup-shaped paper container according to claim 1, wherein the bottom corner offset ruled line is formed in a trapezoidal shape on the body side.   The cup type paper container according to any one of claims 1 to 3, wherein the offset width is four sheets of the thickness of the laminate.