KR101019528B1 - Paper cup for microwave oven, paper cup applicable to microwave oven and method for producing the same - Google Patents

Abstract

The present invention provides a microwave paper cup which does not leak and does not press on any part of the paper cup when the contents of a beverage or instant food are put into the paper cup and heated and cooked in a microwave oven. The microwave paper cup A is formed by folding the rim portion 3 joining the body member and the bottom member in the paper cup a including the body member 1 and the bottom member 2 inward. . The bottom surface of the bottom member 2 can be concave in an inward direction.

Microwave, Paper Cup, Body, Bottom, Rim, Convex, Concave, Press

Description

Microwave Paper Cup, Microwave Oven Paper Cup and Manufacturing Method Thereof {PAPER CUP FOR MICROWAVE OVEN, PAPER CUP APPLICABLE TO MICROWAVE OVEN AND METHOD FOR PRODUCING THE SAME}

The present invention relates to a paper cup for use in a microwave oven.

Background Art Conventionally, paper cups have been widely used as containers for storing hot drinks, instant foods, and the like in vending machines. In addition, although not common, heating and cooking of paper cups containing drinks, side dishes, and the like by using a microwave oven are also performed.

However, when the contents are put into a general-shaped paper cup and heated and cooked in a microwave oven, pressing may occur at the edge of the bottom of the paper cup. The cause is considered as follows. Cellulose of pulp, which is the material of paper, basically absorbs microwaves from microwave ovens. Therefore, in the part where paper overlaps, paper thickness increases and heat generation amount increases. However, since the surface area of the edge portion is small and the amount of heat released is small, the generated heat is accumulated in the edge portion. As a result, the temperature of the edge portion rises, causing the press to occur. However, if the contents are present, the heat generated on the paper is taken away by the contents, so that the pressing becomes difficult to occur. In addition, the irradiation of microwaves from both sides inside and outside the edge portion also causes pressing. That is, a normal paper cup is a structure which has the edge part 3 as a junction part of the trunk member 1 and the bottom member 2, as shown in FIG. 32, and this edge part 3 does not touch the content. It is easy to accumulate, and since a microwave is irradiated from both inside and outside, a press is easy to produce.

In order to solve this problem, Japanese Patent Laid-Open No. 11-11541 discloses a paper cup for a microwave oven having a shape without forming an edge portion. In fact, the occurrence of pressing does not appear in the paper cup for a microwave oven having a shape which does not form an edge as shown in FIG.

However, in the microwave cup which does not form the said edge part, compared with the case where the junction part of the trunk | drum member 1 and the bottom member 2 formed the edge part, there exists a problem of leaking depending on a content.

The present invention provides a microwave paper cup, a microwave-compatible paper cup, and its manufacture, in which the contents of a beverage or instant food, etc., are put into a paper cup and heated and cooked in a microwave oven so that no leakage occurs and no pressing occurs on any part of the paper cup. It is an object to provide a method.

As a result of examining to solve the above problem, in the 1st microwave paper cup of this invention, the edge part which joined the said trunk | drum member and the said bottom member of the paper cup provided with the trunk | drum member and the bottom member was formed inwardly. . In this microwave paper cup, the bottom face of the bottom member may be concave inward.

According to the first microwave paper cup of the present invention, by folding the rim portion of the paper cup inward, when the contents of the beverage or instant food, such as a drink or instant food is cooked in a microwave oven, the contents do not leak, the paper cup It is possible to obtain a paper cup for a microwave oven in which no part is pressed.

The second microwave paper cup according to the present invention forms a bent portion by bending the lower portion of the rim joining the body member and the bottom member of the paper cup including the body member and the bottom member to the inside by 90 degrees or more. In this microwave paper cup, the gap width between the bent portion and the bottom portion space of the bottom member may be 5 mm or less at the maximum portion. A concave wedge may be provided in the bent portion.

According to the second microwave paper cup according to the present invention, when the bottom portion of the rim of the paper cup is bent inward, the contents are leaked when the contents of the beverage or instant food are put into the inside of the paper cup and heated and cooked in the microwave. It is possible to obtain a paper cup for a microwave oven in which no pressing occurs on any portion of the paper cup.

The third microwave paper cup of the present invention includes a body member formed in a cylindrical shape and a bottom member having a bent portion formed by bending an outer circumferential edge portion, wherein the bent portion is folded between the retracted portion and the body portion which are folded by folding the lower end portion of the body portion. A paper cup formed by joining together to form an edge portion, wherein a lower portion of the edge portion is bent inwardly to form a bent portion, and a convex portion having a convex shape is provided in the inner central portion of the bottom portion of the bottom member. The gap width of the space between the bent portion and the bottom portion may be 5 mm or less at the maximum portion.

In the manufacturing method of the third microwave paper cup of the present invention, the cylindrical cup is wound to form a trunk member, the outer peripheral edge of the bottom member is bent to form a bent portion, and the bent portion is folded back by folding the lower end of the torso of the trunk member. It is formed between the folding portion and the body portion and joined to form a rim portion, and the lower portion of the rim portion is bent inward to form a bent portion, and at the same time, the air is not formed in the press portion of the press mold. By forming an air discharge hole in a cylindrical shape, a convex portion having a convex shape is formed inward of the inner central portion of the bottom of the bottom member.

According to the third microwave paper cup of the present invention and a method for manufacturing the same, a bent portion bent inward of the bottom of the rim of the paper cup is formed, and a convex portion having a convex shape facing inward is provided in the inner central portion of the bottom portion. When the contents of beverages or ready-to-eat foods, etc. are put into a paper cup and heated and cooked in a microwave oven, the contents can not be leaked and a paper cup for a microwave oven can be obtained in which no part of the paper cup is pressed.

In the first microwave-compatible paper cup of the present invention, the body member is cylindrically wound to form a body portion, and the upper side of the body portion is bent to form an upper curl portion, and a bend portion formed by bending an outer peripheral edge portion of the bottom member. A paper cup is disposed so that the front end faces toward the lower end of the body part, the folding part is folded between the lower part of the body part and the bent part is formed between the body part to form an edge portion, and the body cup and the bottom member are joined to each other. In, the lower portion of the rim is bent inwardly. The bottom face of the bottom member may be formed concave downward from the inner surface side.

According to the first microwave-compatible paper cup of the present invention, the edge portion between the trunk member and the bottom member of the paper cup is folded inward to form a bottom back portion, whereby the height of the edge portion is lowered, and the bottom portion of the bottom member is lowered. By forming the concave shape, the microwave cup corresponding to the contents of a beverage or instant food is heated and cooked in a microwave oven so that the contents do not leak and no pressing occurs in any part of the paper cup. .

In the second microwave-compatible paper cup of the present invention is formed of a cylindrical member formed by winding a cylindrical body and a bottom member formed by bending the outer peripheral edge portion, the paper cup formed by joining the body portion and the bent portion of the trunk member by The joint is rolled inward to form a bottom curl. In this microwave-compatible paper cup, the joining portion may be formed by inserting the bent portion between the folded portion and the torso portion folded back by folding the lower end portion of the trunk portion.

In the method of manufacturing a second microwave-compatible paper cup of the present invention, the cylindrical cup is wound to form a trunk member, the outer peripheral edge of the bottom member is bent to form a bent portion, and the lower end of the torso of the trunk member is joined to the bent portion. Forming a bottom curled portion by rolling the joint inwardly, or winding the cylindrical portion to form a trunk member, bending the outer peripheral edge of the bottom member to form a bent portion, and forming the bent portion at the lower end of the trunk portion of the trunk member. It is to include the folded back and the folded portion and the body portion between the joint to form a junction, by rolling the junction inward to form a bottom curled portion.

According to the second microwave-compatible paper cup of the present invention and a method of manufacturing the same, the contents of beverages or instant foods are placed inside the paper cups by forming a bottom curl by joining the joint portion between the body member and the bottom member of the paper cup to the inside. When heated and cooked in a microwave oven, it is possible to obtain a microwave-compatible paper cup in which the contents do not leak and no pressing occurs in any part of the paper cup.

According to the present invention, a microwave cup, a microwave-compatible paper cup, which does not leak and does not press on any part of the paper cup when the contents, such as a drink or instant food, are put into the paper cup and heated and cooked in a microwave oven. The manufacturing method can be obtained.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described in detail, referring drawings.

In the typical paper cup a, as shown in FIG. 32, the outer peripheral edge part of the bottom member 2 is bent downward, and the curved part 22 is formed. The lower end of the trunk member 1 is formed with an insertion portion 12 folded inward. The bent part 22 is inserted between the insertion part 12 and the lower end of the trunk part 11. The trunk | drum 11, the insertion part 12, and the bending part 22 are joined together by heat-compression bonding, and the paper cup a is formed by this. The joint part of the trunk | drum 11, the insertion part 12, and the bending part 22 is called the edge part 3, The bottom part 21 of the bottom member 2 is raised by the edge part 3, and the edge part 3 is raised. It consists of the floor. A part of the edge part 3 accumulates heat in a microwave oven, and the edge part 3 is pressed, for this reason.

[1st and 2nd embodiment]

1 shows a first embodiment of a paper cup for a microwave oven according to the present invention. The microwave paper cup A has a trunk member 1 and a bottom member 2, and also has a rim 3, which is a junction between the trunk member 1 and the bottom member 2, in general. It is formed according to the phosphorus paper cup (a). The paper cup A for a microwave oven is manufactured by fold | inserting the edge part 3 of this paper cup a as shown in FIG. 1, and making it shape in contact with the bottom part 21 of the bottom member 2. As shown in FIG. do.

In the paper cup A for a microwave oven, the edge part 3 is folded inward in order to prevent the deterioration of stability on a plane by the force which tries to return to the original part to the edge part 3 inserted inwardly. At the same time, the inner surface of the edge portion 3 may be bonded to and fixed to the outer surface of the bottom portion 21 of the bottom member 2 by adhesive or thermal bonding.

Fig. 2 shows a second embodiment of a paper cup for a microwave oven according to the present invention. The paper cup B for a microwave oven is formed according to the paper cup b of FIG. In the paper cup b, the bottom surface 21 of the bottom member 2 of the paper cup a shown in FIG. 32 is concave toward the inner surface side. By inserting the edge portion 3 of this paper cup b into a shape which is folded inward as shown in Fig. 2 (b) and in contact with the bottom portion 21 of the bottom member 2, a paper cup for a microwave oven ( B) is formed. By making the bottom part 21 of the bottom member 2 concave to an inner surface side, the angle which folded the edge part 3 becomes 90 degrees or more, and the wrinkles which arise at the time of folding can be reduced, and the plane of the paper cup B can be reduced. Stability in the phase becomes good.

Next, the method of manufacturing the paper cups A and B for a microwave oven is demonstrated.

The paper cup a before the rim 3 is folded inward is in the shape of a general paper cup, and is formed by a paper cup molding machine from the trunk member blank 10 and the bottom member blank 20 as shown in FIG. . In general, the trunk member blank 10 is formed in advance in the previous process, and the bottom member blank 20 is molded on a paper cup molding machine.

The process of manufacturing the paper cup a using the trunk member blank 10 and the bottom member blank 20 will be briefly described. First, in order to join the trunk member blank 10 to cylindrical shape, the joining parts 10a and 10b of the trunk member blank 10 are preheated with hot air, and the resin of these surfaces is melted. Next, the cylindrical member 1a (see Fig. 4 (a, b)) is formed by winding the trunk member blank 10 on a mandrel and pressing the joints 10a and 10b together. In addition, the trunk member 1a corresponds to the intermediate product before the formation of the retracting section 12 and the curling section 13 with respect to the trunk member 1. On the other hand, the bottom member blank 20 is bent in its outer peripheral edge and molded into a paper plate type in advance. The bottom member blank 20 shaped into a paper plate is mounted on a mandrel (not shown), and the cylindrical body member 1a is fitted into the mandrel. The resin of the mutually-adhesive part (part forming the edge part) of the cylindrical trunk member 1a and the bottom member blank 20 is preheated with hot air. The lower end of the cylindrical trunk member 1a is folded back inside, and the outer peripheral edge bent downward of the bottom member blank 20 is inserted between the trunk member 1a and its retracting portion 12. The sandwiched portion is crimped to form the edge portion 3, whereby the trunk member 1a and the bottom member 2 are joined. Furthermore, the upper end of the cylindrical trunk member 1a is rolled outward to form the upper curled portion 13. By doing so, molding of the paper cup a is completed.

When manufacturing the microwave paper cup B of FIG. 2, the bottom part 21 of the bottom member 2 of the paper cup a is formed in concave shape to the inner surface side, and a paper cup b is obtained. The processing method of the bottom face part 21 has the method of simultaneously processing in the shaping | molding process of the paper cup a, and the method of processing in the post process of a shaping | molding process. In the former method, in the step of forming the bottom member blank 20 into a paper plate shape and inserting the bottom member blank 20 into a mandrel, the outer peripheral edge of the bottom member blank 20 is bent and the center part is also formed into a concave shape. Thereby, the paper cup b in which the bottom part 21 of the bottom member 2 is concave inward is shape | molded. In the latter method, after forming the paper cup a by a general method, the bottom face portion 21 is formed into a concave shape toward the inner surface side by pressing.

In manufacturing the paper cups A and B for microwave ovens in the paper cups a and b, the edges 3 of the paper cups a and b are folded inward. This process first inclines the edge portion 3 by 45 degrees or more in the manner as shown in Fig. 4A. Next, as shown in Fig. 4 (b), the inclined edge portion 3 is pressurized by hot pressing or ultrasonic welding from the top and bottom to melt the resin on the surface, and the resin is solidified so as to solidify the edge portion 3. It is formed in a planar shape. At this time, the edge portion 3 may be fixed to the bottom portion 21 by adhesive or thermal bonding. In addition, although the procedure of manufacturing the microwave paper cup A from the paper cup a is shown in FIG. 4, the procedure of manufacturing the microwave paper cup B from the paper cup b may also be the same.

The structure of the material used for the paper cups A and B for a microwave oven is based on having paper as a main strength member and having a thermoplastic resin in an innermost layer. For example, a paper layer / polyethylene resin layer, polyethylene resin layer / paper layer / polyethylene resin layer, foamed polyethylene resin layer / paper layer / polyethylene resin layer, polypropylene resin layer / paper layer / polypropylene resin layer, etc. It can be a material of a range paper cup.

It is preferable to use a cup base paper having good paper cup forming ability as the paper serving as the main strength member. The basis weight is not particularly limited, but is preferably in the range of 150 to 300 g / m 2 on the paper cup molding aptitude.

The thermoplastic resin used for the innermost layer needs to have the function of protecting the contents, in particular, not leaking even if a liquid substance is put in, and also enabling the body to be joined by heat sealing and the body to the bottom. There is. Specifically, polyethylene, polypropylene, polyester, ethylene-vinyl acetate copolymer, etc. are mentioned. As thickness of these resin layers, the range of 15-60 micrometers is preferable. These thermoplastic resins are formed in the innermost layer by extrusion processing or lamination processing.

When the microwave paper cups A and B of the above-described configuration are used in a microwave oven, since the contents are heated, it is difficult to hold them directly by hand, so that a paper cup for a microwave oven excellent in heat insulation may be required. Therefore, as shown in Figs. 5 (a) and 5 (b) of the form in which the heat insulation cover 4 is rolled around the outer circumference of the body of the paper cups A and B for microwave ovens in order to impart heat insulation. Microwave paper cups A 'and B' may be formed.

The shape of the heat insulation cover 4 may be the shape shown to FIG. 6 (a-d) other than the shape attached to the outer surface of the trunk | drum 11 of the paper cups A and B for microwave ovens as mentioned above. That is, as shown in FIG. 6 (a), the upper end of the cover body 41 of the heat insulating cover 4 is rolled inward to form a cover upper curled portion 42a, or as shown in FIG. 6 (b). The upper end portion of the cover body portion 41 may be folded back to form an inner side of the cover upper curved portion 42b. As shown in FIG. 6 (c), the lower end of the cover body 41 of the heat insulating cover 4 is rolled inward to form a cover lower curled portion 43a, or as shown in FIG. 6 (d). The lower end portion of the portion 41 may be folded back to form an inner cover bent portion 43b. As shown in Fig. 6 (a) or (b), the cover upper curled portion 42a or the cover upper curved portion 42b is formed at the upper end of the cover body 41 of the heat insulating cover 4, As shown in c) or (d), the cover lower curled portion 43a or the cover lower curved portion 43b may be formed at the lower end of the cover body 41. Although the example of the paper cup A 'for a microwave oven was shown in FIG. 6, it can be formed in the same shape also about the heat insulation cover 4 of the paper cup B' for microwave ovens. According to the shape as described above, the diameter of the cover upper curl part 42a or the cover lower curl part 43a, or the cover upper bend part between the trunk | drum 11 and the cover trunk | drum 41 of the heat insulation cover 4 Since the clearance gap 5 which has the space | interval corresponded to the thickness of 42b or lower cover part bend 43b is formed, heat insulation is ensured over the full length of the vertical direction of the paper cups A 'and B' for a microwave oven. Can be.

Although the heat insulation cover 4 is attached to the outer periphery of the trunk part 11, it is not necessary to mount it so that it may necessarily cover the outer peripheral whole surface of the trunk part 11. The heat insulation cover 4 may be formed shorter than the length of the trunk part 11 in the up-down direction, and the heat insulation cover 4 may be attached only to the upper part of the outer surface of the trunk part 11, for example.

The material used for the heat insulation cover 4 is a material which has heat insulation, For example, cardboard, a piece of corrugated board, corrugated board, embossed paper, foamed paper, etc. can be used.

The cardboard mainly used is a cardboard whose surface is smooth, such as a coating board, a manila board, and an ivory, and the thickness is preferably in the range of 200 to 400 g / m 2.

Although corrugated paper has a kind of A stage, B stage, E stage, F stage, etc., since it is wound around a paper cup main body (body part 11), the flexible F stage or E stage is preferable. Moreover, what is called single-sided corrugated cardboard which does not have a liner in one surface may be used, and the center which provided the end processing can also be pulled out and used for an outer surface. Moreover, the corrugated board processed by the wave form can also be used.

Unlike ordinary corrugated cardboard, the embossed paper is embossed with a liner paper with a depth of 1 to 2 mm, such as a point shape, a lattice, or the like, in the center. The liner paper may stick to one or both sides. The center paper can be used in the range of 100 to 180 g / m 2, and the liner paper can be used in the range of 200 to 270 g / m 2. Moreover, there exists a heat insulation effect like a corrugated cardboard, and designability can be improved by printing a pattern etc. on the surface liner paper.

As for the structure of foamed processing paper, the structure of a thermoplastic resin layer / paper layer / thermoplastic resin layer which foams is basic. Specifically, a laminate of a mixed resin layer structure of a low density polyethylene resin layer / coated paper / low density polyethylene resin and a high density polyethylene resin to be foamed is used. When rolled into the trunk | drum 11 of the paper cups A 'and B' for microwave ovens, the foamed resin layer may be made into the surface, or the non-foamed resin layer may be made into the surface.

[3rd and 4th embodiment]

Fig. 7 shows a third embodiment of a paper cup for a microwave oven according to the present invention. In the microwave paper cup C of FIG. 7, the lower portion of the edge portion 3 of the paper cup a shown in FIG. 32 is bent inward as shown in FIG. 7A to form a bent portion 3a. The space O is provided between the bent portion 3a and the bottom portion 21 of the bottom member 2. The position at which the bent portion 3a is bent is set in a range of 1/2 to 3/4 of the total width Ha (see FIG. 32) of the edge portion 3 from the lower end of the edge portion 3. The gap width of the space O between the bent portion 3a and the bottom surface portion 21 of the bottom member 2 is preferably 5 mm or less, more preferably 2 mm or less at the maximum portion. When it becomes 5 mm or more, there exists a possibility that a press may generate | occur | produce. The bending angle is from 90 degrees as shown in FIG. 7 (a) until the tip of the bent portion 3a as shown in FIG. 7 (b) is in contact with the bottom portion 21 of the bottom member 2. It can be set within the range of. If the angle of bending the edge portion 3 is large, the effect of suppressing the occurrence of wrinkles is increased.

In the microwave paper cup C of FIG. 7, as shown in FIG. 8 (a), the foldable portion 12 of the trunk member 1, which is the inner side surface of the edge portion 3, is rimmed from the lower end in advance. It may also be manufactured according to the paper cup (c) limited to the width to the bending position (P) of the lower part of 3). When manufacturing the microwave paper cup C from the paper cup c, as shown in FIG. 8 (b), the lower end of the trunk member 1 and the bent portion 22 of the bottom member 2 are bent. , The edge portion 3 can be easily bent at the position P. FIG.

In the paper cup C for a microwave oven, the force which wants to return to the original edge part 3 bent inward acts, and in order to prevent the deterioration in stability on a plane, the lower part of the edge part 3 is turned inward. At the same time, the tip portion of the bent portion 3a may be adhered to and fixed to the outer surface of the bottom portion 21 of the bottom member 2.

As the shape of the bent portion 3a of the paper cup C for a microwave oven, in addition to the above-mentioned straight shape, a shape bent in an arc shape as shown in Fig. 9 (a) and a straight shape as shown in Fig. 9 (b). A shape in which the tip portion of the bent portion 3a is bent at a right angle to the bottom surface portion 21 side, and a shape in which the tip portion of the bent portion 3a is bent in an arc shape toward the bottom surface portion 21 side, as shown in FIG. 9 (c). And as shown in FIG.9 (d, e, f, g), you may make it the shape which supports the bottom face part 21 at the front-end | tip of the bending part 3a.

Fig. 10 shows a fourth embodiment of a paper cup for a microwave oven according to the present invention. In the paper cup D for a microwave oven according to the fourth embodiment, as shown in Fig. 10 (a), the paper cup a having the edge portion 3, which is a joining portion between the trunk member 1 and the bottom member 2 ( The lower portion of the edge portion 3 (see FIG. 32) is bent inward at an angle of approximately 90 degrees to form the bent portion 3a. This point is the same as the paper cup C for a microwave oven of FIG. Instead of the paper cup (a), according to the paper cup (c) of Figure 8 (a) may be produced a microwave paper cup (D). In the paper cup D for a microwave oven, a predetermined number of concave wedges Q are provided in the bent portion 3a (four in the illustrated example). As shown in the schematic sectional drawing of FIG. 10 (b), the wedge Q is formed in concave shape which becomes deeper as it gets closer to the front-end | tip of the bending part 3a. When the wedge Q is not provided, a large number of wrinkles R may be generated in the bent portion 3a as shown in FIG. 10 (c). On the other hand, when the wedge Q is provided, the wrinkles R generated when the bent portion 3a is bent can be absorbed into the portion of the wedges Q, thereby suppressing the occurrence of the wrinkles R. As shown in FIG. Therefore, it is preferable in appearance, and the stability of the paper cup D for a microwave oven on a plane becomes favorable. The number of wedges Q may be such that generation | occurrence | production of the wrinkle R is inconspicuous in the bending part 3a. It is preferable to provide the wedges Q at 4-8 places at equal intervals with respect to the circumferential direction of the bending part 3a.

Next, the method of manufacturing the paper cups C and D for a microwave oven is demonstrated.

Even when manufacturing the microwave cups C and D, the paper cup a before bending the lower portion of the edge portion 3 inwards is a shape of a general paper cup, and the body member blank as shown in FIG. 10 and the bottom member blank 20 are molded into a paper cup molding machine. The procedure of manufacturing the paper cup a from the blanks 10 and 20 is the same as that of the above-mentioned paper cups A and B for microwave ovens, and the detail is abbreviate | omitted.

In manufacturing the paper cup C for a microwave oven from the paper cup a, the lower part of the edge part 3 of the paper cup a is bent inside. This process can be performed by the method shown to FIG. 4 (a), (b).

In addition, when manufacturing the paper cup D for a microwave oven of FIG. 10, the wedge Q is provided in several places of the folded part 3a. In the heat press working as shown in Fig. 4 (b), this working can be formed by performing an upper mold by pressing instead of a mold in which the protrusion T is provided as shown in Fig. 4 (c). have.

Although the structure of the material used for the paper cups C and D for a microwave oven is based on having paper as a main strength member and having a thermoplastic resin in an innermost layer, the specific structure of the material is the 1st microwave oven mentioned above. It may be the same as the specific example described about the material of the paper cups A and B.

In order to give heat insulation to the above-mentioned microwave paper cups C and D, as shown in FIG. 11, the heat insulation cover 4 is wound around the outer periphery of the trunk | drum 11, and the paper cups C 'and D for microwave ovens. May be formed.

The shape of the heat insulation cover 4 is not only the shape attached to the outer surface of the trunk portion 11 of the paper cups C and D for microwave ovens as described above, but also the curled portions shown in FIGS. 42a, 43a, or the shape of which the bent parts 42b and 43b were independent or combined may be sufficient. Details of the shape of Figs. 12A to 12D are the same as those in Fig. 6, and the detailed description is omitted. In addition, although the example of the paper cup C 'for a microwave oven was shown in FIG. 12, the heat insulating cover 4 of the paper cup D' for a microwave oven can be made into the same shape. According to the shape as described above, the diameter of the cover upper curl part 42a or the cover lower curl part 43a, or the cover upper bend part between the trunk | drum 11 and the cover trunk | drum 41 of the heat insulation cover 4 Since the clearance gap 5 which has the space | interval corresponded to the thickness of 42b or the lower curved part 43b of a cover is formed, heat insulation can be ensured over the full length of the microwave paper cups C 'and D' up-down direction. have.

Also in the paper cups C 'and D' for microwave ovens, the heat insulation cover 4 can be made shorter than the length of the trunk part 11 in the up-and-down direction, and it can also be attached to the upper part of the trunk part 11 outer surface. The material used for the heat insulation cover 4 can use the same material as the heat insulation cover 4 shown in FIG. 5 and FIG.

[Fifth Embodiment]

Fig. 13 shows a fifth embodiment of a paper cup for a microwave oven according to the present invention. The paper cup E for a microwave oven according to the fifth embodiment includes a trunk member 1 and a bottom member 2 like a general paper cup, and at the same time, an edge portion which is a junction between the trunk member 1 and the bottom member 2 ( Have 3) The lower portion of the edge portion 3 is bent inward to form a bent portion 3a, whereby the microwave paper cup E is spaced between the bottom portion 21 of the bottom member 2. It is formed into a shape having a).

The position at which the bent portion 3a is bent, that is, the width h of the bent portion 3a is the width (total height) of the edge portion 3 as shown in the partial enlarged view of FIG. ) To the range of 1/2 to 3/4. As shown in Fig. 14 (b), the gap width o of the space O between the bent portion 3a and the bottom surface portion 21 of the bottom member 2 is preferably 5 mm or less at the maximum portion, more preferably. Preferably 3 mm or less. When it becomes 5 mm or more, there exists a possibility that a press may generate | occur | produce.

The angle at which the bent portion 3a is bent is not particularly limited, but is approximately 90 degrees.

As the shape of the bent portion 3a, there is a shape that is bent in an arc shape as shown in Fig. 14 (b), or a straight shape as shown in Fig. 15. As shown in Fig. 15B, the tip portion of the straight bent portion 3a is bent at a right angle to the bottom surface portion 21 side, and the tip portion of the bent portion 3a is shown in Fig. 15C. It can also be set as the shape bent in circular arc shape to the bottom face part 21 side. 15 (d), (e), (f), and (g), it can be set as the shape which supports the bottom part 21 by the front-end | tip of the bending part 3a.

As shown in FIG. 13, in the paper cup E for a microwave oven, the circular convex part 21a of the convex shape is provided in the inner center part of the bottom part 21 inwardly. When the convex part 21a is installed in the center of the bottom part 21, when the contents are put into the inside of the microwave paper cup E, and it is used in a microwave oven, in the bottom part 21, The shape of the convex portion 21a, which was a convex shape toward the inside of E), is reversed to become a convex shape toward the outside, so that the occurrence of pressing of the edge portion 3 of the paper cup E for a microwave oven is reduced. The convex part 21a is formed in circular arc shape. Although the shape of the convex part 21a is not limited, It is preferable that the maximum height d is 0.2 mm or more.

Next, the manufacturing method of the paper cup E for a microwave oven is demonstrated.

The paper cup a before bending the lower part of the edge part 3 to form the bending part 3a can be manufactured similarly to the case of the paper cup A for a microwave oven mentioned above.

In the manufacture of the paper cup E for a microwave oven, the lower portion of the edge portion 3 of the paper cup a is bent inward to form the bent portion 3a. This step is performed in the following order. First, in the manner as shown in Fig. 16A, the lower portion of the edge portion 3 is inclined at least 30 degrees inward. Next, by the method as shown to Fig.16 (b), (c), the bending part 3a inclined by the hot press or ultrasonic welding from top and bottom is pressed and formed in circular arc shape. At this time, as shown in Fig. 16 (d), the air outlet hole is formed in the pressing part 51 of the press mold 50 without the air outlet hole, but the receiving part 52 is a hollow cylinder. Along with the increase in the internal pressure, a circular convex portion 21a having a convex shape toward the inside can be formed in the inner central portion of the bottom face portion 21 of the bottom member 2. By providing this convex part 21a in the inner center part of the bottom face part 21, when the content is put into the inside of the microwave paper cup E for use in a microwave oven, it is convex inwardly in the bottom face part 21 when used in a microwave oven. The shape of the convex portion 21a is reversed to become a convex shape toward the outside, whereby the risk of pressing on the edge portion 3 of the paper cup E for a microwave oven can be reduced.

Next, although the structure of the material used for the paper cup E for a microwave oven is based on having paper as a main strength member, and having a thermoplastic resin in an innermost layer, the specific structure of the material is the 1st electron mentioned above. It may be the same as the specific example demonstrated about the material of the range paper cups A and B. FIG.

In order to give heat insulation to the paper cup E for a microwave oven, the heat insulation cover 4 is wound around the outer periphery of the body part 11 of a microwave paper cup E, and the paper cup for a microwave oven as shown in FIG. E ') may be formed.

The shape of the heat insulation cover 4 may be the shape which combined the curled parts 42a and 43a or the bent parts 42b and 43b individually or shown in FIG. 18 (a)-(d). Details of the shapes of FIGS. 18A to 18D are the same as those in FIGS. 6 and 12, and detailed descriptions thereof are omitted. The heat insulation cover 4 can also be made shorter than the length of the trunk part 11 in the up-down direction, and can be attached to the upper part of the outer surface of the trunk part 11. The material of the heat insulation cover 4 in the paper cup E 'for a microwave oven may be the same as that of the case of FIG.

[Sixth and Seventh Embodiments]

Fig. 19 shows a microwave-compatible paper cup according to a sixth embodiment of the present invention. The microwave-compatible paper cup F folds the lower half of the edge portion 3 of the paper cup a shown in FIG. 32 inward to form a bottom retracted portion 3a, thereby forming the bottom retracted portion 3a. The height is lowered.

20 shows a microwave-compatible paper cup according to a seventh embodiment of the present invention. In the microwave-compatible paper cup G, the bottom 21 of the bottom member 2 of the microwave-compatible paper cup F of FIG. 19 is deformed concave downward from the inner surface side to be the bottom face 21U.

As shown in Fig. 20 (b), the bottom portion 21U has a U-shape deformed downwardly from the inside. In addition, the bottom surface portion 21U includes a lower surface portion 21Ua and a wall surface portion 21Ub as shown in Fig. 20C. The curved surface portion R is formed between the lower surface portion 21Ua and the wall surface portion 21Ub. It is preferable to form the lower surface portion 21Ua in a planar shape and to bring the wall surface portion 21Ub close to the bottom retracted portion 3a. The radius of curvature of the curved portion R is preferably in the range of 3 to 10 mm, more preferably in the range of 5 to 8 mm. If the radius of curvature is less than 3 mm, pin holes are generated, which causes leakage. On the other hand, when the radius of curvature is more than 10 mm, pressing is likely to occur in the edge portion 3.

As for the maximum depth d of the bottom part 21U, 50% or more of the width | variety (height) of the edge part 3 is preferable from the upper end of the edge part 3 which folded the lower part back. By setting it as 50% or more, irradiation of the microwave to the back side of the edge part 3 in a microwave oven can be interrupted | blocked, and the occurrence of the press of the edge part 3 can be prevented. If it is less than 50%, the edge 3 may be pressed.

The distance x between the lower surface portion 21Ua and the lower surface X formed by the lower end of the trunk portion 11 is preferably in the range of less than 5 mm upward and less than 2 mm downward. If the distance x is 5 mm or more upward as shown in Fig. 21A, the effect of blocking the microwaves behind the edge portion 3 is lost. If the distance x is 2 mm or more downward as shown in Fig. 21B, there is a fear that the microwave-compatible paper cup G loses stability.

Moreover, in 6th Embodiment, when the height of the edge part 3 is less than 10 mm, the height of the edge part 3 is 5 mm or less by folding back the lower part of the edge part 3 inward. It is effective when it becomes. Therefore, when the height of the edge part 3 exceeds 10 mm and the height of the edge part 3 exceeds 5 mm even after folding the lower part of the edge part 3 inwardly, It is preferable to set it as 7th Embodiment which deform | transformed the bottom face part 21 in concave shape below.

Next, a method for producing microwave-compatible paper cups F and G will be described.

In order to manufacture the microwave oven compatible paper cup F of the sixth embodiment, the paper cup a of FIG. 32 is first manufactured. The manufacturing procedure may be the same as the case of said paper cup (a) for microwave ovens.

The bottom part of the edge part 3 is formed by folding the bottom part of the edge part 3 of the paper cup a back inward to form the bottom back part 3a, as shown in FIG. Tilt inside more than 45 degrees. Next, in the manner as shown in Fig. 22B, the inclined portion is pushed downward by the press working from the top and the bottom so that the edge portion 3 is folded back from the bottom retracting portion 3a. . In addition, by the method as shown in FIG.22 (c), the edge part 3 folded by the bottom retracting part 3a can be formed by applying pressure from the surface side.

In this manner, the microwave-compatible paper cup F of the sixth embodiment can be produced by folding the lower portion of the edge portion 3 of the paper cup a back inward to form the bottom folded portion 3a. .

When manufacturing the microwave oven compatible paper cup G of 7th Embodiment, the microwave oven compatible paper cup F before deforming the bottom part 21 of the bottom member 2 to concave shape is manufactured.

Next, at the raised bottom, the planar bottom portion 21 is deformed into a concave shape to form a U shape. In the step of deforming the bottom face portion 21 into a concave shape, as shown in FIG. It deforms by the head 102 which has 102a, and the bottom part 21 is made into U shape. In order to facilitate molding, a method of heating the bottom member 2 in advance, a method of heating the head 102, or a method of ultrasonically vibrating the head 102 may be used. As shown in FIG. 23B, a method of compressing the rotary roller 103 may be used while rotating the mandrel 102.

Although the structure of the material used for a microwave oven compatible paper cup is based on having paper as a main strength member and having a thermoplastic resin in an innermost layer, the specific structure of the material is with respect to the paper cups A and B for a microwave oven. It may be the same as the specific example described.

Also in the microwave-compatible paper cups F and G, in order to give heat insulation, as shown in FIG. 24 (a, b), the microwave oven correspondence of the form which wound the heat insulation cover 4 around the outer periphery of the trunk | drum 11 Paper cups F 'and G' may be formed.

The shape of the heat insulation cover 4 is also made to be in close contact with the outer surface of the trunk portion 11, and the curled portions 42a and 43a or the bent portions 42b and 43b of FIGS. 25A to 25D. ) May be used alone or in combination. Details of the shape of Figs. 25A to 25D are the same as those in Figs. 6, 12 and 18, and the description is omitted. 25 shows an example of the microwave-compatible paper cup F ', but the heat-insulating cover 4 of the microwave-compatible paper cup G' can also be formed in the same shape. The heat insulation cover 4 can be attached to the upper part of the outer surface of the trunk | drum 11 shorter than the length of the vertical direction of the trunk | drum 11 of microwave-compatible paper cups F 'and G'. The heat insulating cover 4 material of the microwave-compatible paper cups F 'and G' may also be the same as in the case of FIGS. 6, 12, and 18.

[8th and 9th embodiment]

Fig. 26 shows a microwave cup corresponding to a microwave oven according to an eighth embodiment of the present invention. The microwave-compatible paper cup H is made according to the paper cup E as shown in FIG. The paper cup E has a trunk member 1 and a bottom member 2. The outer circumferential edge portion of the bottom member 2 is bent downward to form a bent portion 22, and the bent portion 22 and the lower end portion of the trunk portion 11 of the trunk member 1 are hot pressed to be joined to each other to join the joint 3 '. ) Is formed. The microwave-compatible paper cup H is produced by rolling the junction 3 'of the paper cup E inward to form the bottom curled portion 3b. The height h of the bottom curled portion 3b is preferably set to 1/2 or less of the height Ha of the joined portion 3 before rolling.

Fig. 28 shows a microwave cup corresponding to a ninth embodiment of the present invention. In the microwave-compatible paper cup I, the edge part 3 of the general paper cup a shown in FIG. 32 is rolled inward and it is set as the bottom curl part 3c. The height h of the bottom curled portion 3c is preferably set to 1/2 or less of the height ha of the edge portion 3 before rolling.

Next, a method for producing microwave-compatible paper cups H and I will be described.

The paper cup E before the joint 3 'is rolled inward and the paper cup a before the edge 3 is rolled inward, and the trunk member blank 10 and the bottom member blank 20 shown in FIG. From the paper cup molding machine. The manufacturing procedure of the paper cup a is as described above. In order to manufacture the paper cup (E), the lower end of the cylindrical body member 1a and the outer peripheral edge bent below the bottom member blank 20 are pressed to form a joint portion 3 'to form the body member 1 and The point of joining the bottom member 2 is different from the manufacturing procedure of the paper cup a.

Then, the junction portion 3 'of the paper cup E is rolled inward to form the bottom curled portion 3b, thereby producing a microwave-compatible paper cup H, and the edge portion 3 of the paper cup a. May be rolled inward to form a bottom curled portion 3c to produce a microwave-compatible paper cup I.

In these manufacturing processes, first, as shown in Fig. 29A, the joining portion 3 'or the edge portion 3 is bent inward arcing. Next, by the method as shown in FIG. 29 (b), it is rolled inward so as to pressurize with the concave mold from above. In this way, the bottom curled portion 3b or the bottom curled portion 3c can be formed. In addition, although FIG. 29 shows the example which manufactures the microwave range compatible paper cup H, it is the same procedure also when manufacturing the microwave range compatible paper cup I. FIG.

Although the structure of the material used for the microwave-compatible paper cups H and I is based on having paper as a main strength member and having a thermoplastic resin in an innermost layer, the specific structure of the material is the above-mentioned paper cup for a microwave oven. You may be the same as the specific example demonstrated about (A, B).

Microwave oven-compatible paper cups (H, I), in order to provide heat insulation, as shown in Fig. 30 (a), (b) microwave oven of the form in which the heat insulating cover 4 is wound around the outer periphery Paper cups H 'and I' may be formed.

As the shape of the heat insulating cover 4, the shape of the heat insulating cover 4 is closely attached to the outer surface of the body portion 11 of the microwave-compatible paper cups A and B as described above. The curled portions 42a and 43a or the bent portions 42b and 43b may be in a single or combined shape. Details of the shapes of FIGS. 31A to 31D are the same as those in FIGS. 6, 12, 18, and 25. 31 shows an example of the microwave-compatible paper cup H ', but the case of the microwave-compatible paper cup I' may have the same shape. The heat insulating cover 4 may be mounted on the upper portion of the outer surface of the body portion 11 by making it shorter than the length in the vertical direction of the body portion 11 of the microwave cup corresponding to the paper cups H 'and I'. The material of the heat insulating cover 4 of the microwave-compatible paper cups H 'and I' may also be the same as in the case of FIGS. 6, 12, 18 and 25.

Examples of the use of the microwave cup or microwave-compatible paper cup of the present invention include containers for instant foods that warm instant ramen, and containers for hot drinks such as coffee, black tea, and soup.

Example

Next, the paper cup for a microwave oven of the present invention is described in more detail with reference to Examples.

[Example 1-1]

As Example 1-1 of the paper cup for a microwave oven of this invention, the paper cup A for microwave ovens shown in FIG. 1 was produced. As the trunk member 1, the material of the 280 g / m <2> / low-density polyethylene resin 25 micrometers structure of the cup paper was used for the surface. As the bottom member 2, a material having a 255 g / m 2 / m low-density polyethylene resin 25 탆 structure was used on the surface. The trunk member blank 10 as shown in FIG. 3 was produced by a drilling process, and the trunk member blank 10 was wound around a mandrel to form a cylindrical trunk member 1a. Next, the bottom member blank 20 is inserted from below the trunk member 1a by a general paper cup molding machine, the adhesive part is heated by hot air, and the lower end of the trunk member 1a is folded inward and folded back. A paper cup a was produced as (12). Subsequently, in the manner as shown in Fig. 4 (a), the edge portion 3 is inserted inside, and hot press processing as shown in Fig. 4 (b) (processing conditions: temperature is 120 ° C., pressure). The edge portion 3 is pressurized with this 600 ms, time is 5 seconds) to melt-solidify the resin at the edge portion 3 joining portion to form the edge portion 3 in a planar shape to form a microwave paper cup a. Made.

In the microwave paper cup A of Example 1-1, when the contents were put and heated and cooked in a microwave oven by pressing the rim 3 of the paper cup a inward, it pressed against the rim 3 This never happened.

[Example 1-2]

As Example 1-2 of the microwave paper cup of this invention, the microwave paper cup B shown to FIG. 2 (b) was produced. First, the paper cup a was produced like Example 1-1, Next, the bottom part 21 of the bottom member 2 of the produced paper cup a was deformed inward concave, and the paper cup ( b) produced. Subsequently, the edge portion 3 is inserted inward, and the edge portion 3 is bonded and fixed to the bottom portion 21 of the bottom member 2 with an adhesive, thereby producing a paper cup B for a microwave oven. did.

In the microwave paper cup B of this Example 1-2, when the edge part 3 of the paper cup b was folded inward, when the contents were put and heated and cooked in a microwave oven, Pressing did not occur. In addition, the bottom portion 21 of the bottom member 2 of the paper cup b is deformed inwardly so that the wrinkles generated when the edge portion 3 is folded to 90 degrees or more are folded. It can absorb and reduce this, and the stability of the paper cup B on the plane became favorable.

EXAMPLE 1-3

As Example 1-3 of the paper cup for microwave ovens of this invention, the paper cup A 'for microwave ovens shown to Fig.5 (a) was produced. The heat insulation cover 4 using the cylindrical corrugated cardboard (F flute) corresponding to the whole outer surface of the trunk | drum 11 of the paper cup A for microwave ovens of Example 1-2 was produced, and this cylindrical heat insulation cover 4 was carried out. A microwave paper cup A was sandwiched in and partially adhesively fixed to prepare a microwave paper cup A 'as shown in Fig. 5A.

In the microwave paper cup A 'of Example 1-3, when the edge part 3 of the paper cup b was folded inward, when the contents were put and heated and cooked in a microwave oven, Pressing did not occur. Moreover, by attaching the heat insulation cover 4 made of the corrugated cardboard to the trunk | drum 11, the content heated with heat insulation does not cool well, and touches the contents without feeling hotness, and it is a paper cup for a microwave oven ( Could take A ').

Example 2-1

As Example 2-1 of the paper cup for a microwave oven of this invention, the paper cup C for microwave ovens shown in FIG. 7 (b) was produced. The material of the cup paper 280 g / m <2> / low-density polyethylene resin 25 micrometer structure was used for the trunk member 1, and the material of the cup paper 255 g / m <2> / low density polyethylene resin 25 micrometer structure was used for the bottom member 2 on the surface, respectively. . The paper cup (a) serving as the basis of the paper cup (C) was produced in the same procedure as in Example 1-1. The lower part of the edge of the paper cup (a) 3 is bent inward, and the tip of the bent portion 3a is bent to a position where the bottom portion 21 of the bottom member 2 is in contact with the bent portion. The tip end of (3a) was adhesive-fixed to the bottom face part 21, and the paper cup C for a microwave oven was produced.

In the microwave paper cup (C) of this Example 2-1, when the bottom portion of the paper cup (a) rim (3) is bent inward, when the contents are put and heated and cooked in a microwave oven, the rim (3) ) Was not pressed.

Example 2-2

As Example 2-2 of the microwave oven paper cup of the present invention, a microwave oven paper cup (D) shown in FIG. 10 was produced. The paper cup a was produced by the procedure similar to Example 2-1, and the lower part of the edge part 3 of the paper cup a was then bent inward approximately 90 degrees. The bent portion 3a was provided with four concave wedges Q at equal intervals in the circumferential direction of the edge portion 3 to produce a paper cup D for a microwave oven.

In the microwave paper cup (D) of this Example 2-2, when the bottom portion of the paper cup (a) rim portion 3 is bent inward, when the contents are put and heated and cooked in a microwave oven, the rim portion 3 ) Was not pressed. Moreover, by providing four concave wedges Q at equal intervals in the bent portion 3a, the wrinkles generated when they are folded can be absorbed and reduced, and the stability on the plane is improved.

[Example 2-3]

As Example 2-3 of the paper cup for a microwave oven of this invention, the paper cup C 'for microwave ovens shown to FIG. 11 (b) was produced. The heat insulation cover 4 using the cylindrical corrugated cardboard (F flute) corresponding to the whole outer surface of the paper cup (C) body part 11 for a microwave oven of Example 2-2 was produced, and this cylindrical heat insulation cover 4 was carried out. A microwave oven paper cup C was sandwiched and partially adhesively fixed to prepare a microwave oven paper cup C 'as shown in FIG.

In the microwave paper cup C 'of this embodiment 2-3, the lower portion of the paper cup a rim 3 is bent inward, and when the contents are put and cooked in a microwave oven, the rim portion ( There was no press in 3). Moreover, by attaching the heat insulation cover 4 made of the corrugated cardboard to the trunk | drum 11, the content heated with heat insulation does not cool well, and touches the contents without feeling hotness, and it is a paper cup for a microwave oven ( C ') could take.

Example 3-1

As Example 3-1 of the paper cup for a microwave oven of this invention, the paper cup E for microwave ovens shown in FIG. 13 was produced. The material of the cup paper 280 g / m <2> / low-density polyethylene resin 25 micrometer structure was used for the trunk member 1, and the material of the cup paper 255 g / m <2> / low density polyethylene resin 25 micrometer structure was used for the bottom member 2 on the surface, respectively. . The paper cup (a) used as the basis of the paper cup (E) for a microwave oven was produced in the same procedure as Example 1-1. The lower portion of the edge of the paper cup (a) 3 is bent inward to form an arcuate bent portion 3a that expands outward, and the receiving portion 52 of the press mold 50 of FIG. Using a hollow-cylindrical cylindrical shape, a circular convex portion 21a having a convex shape was convex inward in the inner central portion of the bottom portion 21 to produce a paper cup E for a microwave oven.

In the microwave paper cup (E) of this embodiment, the lower portion of the paper cup (a) rim portion (3) is bent inward arcing, and the inner central portion of the bottom portion (21) is convex in a circular shape. By providing the convex portion 21a, when the contents are put into the inside of the microwave paper cup E and used in the microwave, the shape of the convex portion 21a having a convex shape toward the inside of the bottom portion 21 is reversed. The convex shape toward the outside, the risk of the pressing of the edge of the paper cup (E) for microwave oven is very small, when pressing the edge portion (3) when the contents are heated and cooked in the microwave oven There was no work.

Example 4-1

As Example 4-1 of the microwave oven correspondence paper cup of this invention, the microwave oven correspondence paper cup F shown in FIG. 19 was produced. The material of the cup paper 280 g / m <2> / low-density polyethylene resin 25 micrometer structure was used for the trunk member 1, and the material of the cup paper 255 g / m <2> / low density polyethylene resin 25 micrometer structure was used for the bottom member 2 on the surface, respectively. . The paper cup a used as the basis of the microwave-compatible paper cup F was produced in the same procedure as in Example 1-1. The height of the edge portion 3 of the paper cup a was 10 mm. In the process as shown in Fig. 22, the lower half of the edge portion 3 is folded inward to form a bottom retracted portion 3a so that the height of the edge portion 3 becomes 5 mm. (F) was produced.

In the microwave-compatible paper cup E of Example 4-1, when the contents were put and heated and cooked in the microwave by pressing the edge portion 3 of the paper cup a back inside, the paper cup E was pressed. The occurrence of was not seen. And stability on the plane was favorable.

Example 4-2

As Example 4-2 of the microwave oven compatible paper cup of the present invention, a microwave oven compatible paper cup G shown in FIG. 20 was produced. First, as described in Example 4-1, the bottom half of the edge portion 3 having a height of 15 mm is folded back to form a folded portion 3a, and the height of the edge portion 3 is 7 mm. A microwave-compatible paper cup F as shown in FIG. 19 was produced. Next, in the process shown in FIG. 23, the bottom part 21 of the bottom member 2 of the microwave oven compatible paper cup F is deformed downward to the U-shaped bottom part 21U having a depth of 5 mm. One microwave-compatible paper cup G was produced.

In the microwave oven-compatible paper cup G of Example 4-2, when the contents were put and cooked by heating in a microwave oven, no occurrence of pressing was seen in any part of the paper cup. And stability on the plane was favorable.

EXAMPLE 4-3

As Example 4-3 of the microwave oven compatible paper cup of the present invention, a microwave oven compatible paper cup F 'shown in Fig. 24A was produced. The heat insulation cover 4 using the cylindrical corrugated cardboard (F flute) corresponding to the whole outer surface of the trunk | drum 11 of the microwave-compatible paper cup F of Example 4-1 was produced, and this cylindrical heat insulation cover 4 ), The microwave-compatible paper cup F was sandwiched and partially adhesively fixed to prepare a microwave-compatible paper cup F '.

In the microwave-compatible paper cup F 'of this embodiment 4-3, when the edge portion 3 of the paper cup a is folded back to the inside, the portion of the paper cup is heated and cooked in a microwave oven when the contents are put and cooked. No occurrence of pressing was seen. In addition, by attaching the heat insulation cover 4 made of corrugated cardboard to the trunk portion 11, the contents heated with heat insulating properties do not cool well and the contents do not feel hot. Could take F ').

EXAMPLE 4-4

As Example 4-4 of the microwave oven compatible paper cup of the present invention, a microwave oven compatible paper cup G 'shown in Fig. 24B was produced. The heat insulation cover 4 using the cylindrical corrugated cardboard (F flute) corresponding to the whole outer surface of the microwave oven correspondence paper cup G body part 11 of Example 4-2 was produced, and this cylindrical heat insulation cover 4 was carried out. Microwave oven compatible paper cup G was inserted, partially adhesively fixed, and microwave oven compatible paper cup G 'was produced.

In the microwave-compatible paper cup G 'of this embodiment 4-4, when the edge portion 3 of the paper cup a is folded back inward, the portion of the paper cup is heated and cooked in a microwave oven by putting the contents therein. No occurrence of pressing was seen. In addition, by attaching the heat insulation cover 4 made of corrugated cardboard to the trunk portion 11, the contents heated with heat insulating properties do not cool well and the contents do not feel hot. Could take G ').

[Example 5-1]

As Example 5-1 of the microwave range compatible paper cup of the present invention, the electronic range compatible paper cup H shown in FIG. 26 was produced. The material of the cup paper 280 g / m <2> / low-density polyethylene resin 25 micrometer structure was used for the trunk member 1, and the material of the cup paper 255 g / m <2> / low density polyethylene resin 25 micrometer structure was used for the bottom member 2 on the surface, respectively. . The trunk member blank 10 as shown in FIG. 3 was produced by a drilling process, and the trunk member blank 10 was wound around a mandrel to form a cylindrical trunk member 1a. Next, the bottom member blank 20 is inserted from below the trunk member 1a by a general paper cup molding machine, the adhesive portion is heated by hot air, the outer peripheral edge portion of the bottom member 2 is bent downward, and the curved portion 22 is formed. A paper cup E as shown in Fig. 27 having a bent portion 22 and a joined portion 3 'joined by heat-compression bonding the lower end of the trunk member 1 was produced. Subsequently, the junction part 3 'was rolled inward, the bottom curl part 3b was formed, and the microwave oven compatible paper cup H was produced.

In the microwave-compatible paper cup H of the embodiment 5-1, the bonding portion 3 'of the paper cup E is rolled inward, so that when the contents are put and heated and cooked in the microwave, the pressing portion is pressed against any portion of the paper cup. There was no occurrence. And stability on the plane became favorable.

EXAMPLE 5-2

As Example 5-2 of the microwave oven compatible paper cup of the present invention, a microwave oven compatible paper cup (I) shown in FIG. 28 was produced. The material of the cup paper 280 g / m <2> / low-density polyethylene resin 25 micrometer structure was used for the trunk member 1, and the material of the cup paper 255 g / m <2> / low density polyethylene resin 25 micrometer structure was used for the bottom member 2 on the surface, respectively. . The paper cup (a), which is the basis of the electronic range-compatible paper cup (I), was produced in the same manner as in Example 1-1. The edge portion 3 of the paper cup a was rolled inward to form a bottom curl portion 3c, thereby producing a microwave-compatible paper cup I.

In the microwave-compatible paper cup I of Example 5-2, the edge portion 3 of the paper cup a is rolled inside, so that when the contents are put and cooked by heating in a microwave, it is pressed against any portion of the paper cup. There was no occurrence. And stability on the plane became favorable.

Example 5-3

As Example 5-3 of the microwave oven compatible paper cup of the present invention, a microwave oven compatible paper cup H 'shown in FIG. 30 was produced. The heat insulation cover 4 using the cylindrical corrugated cardboard (F flute) corresponding to the whole outer surface of the microwave oven correspondence paper cup H body 11 of Example 5-2 was produced, and this cylindrical heat insulation cover 4 was carried out. The microwave oven compatible paper cup H was sandwiched and partially adhesively fixed to prepare a microwave oven compatible paper cup H '.

In the microwave-compatible paper cup H 'of the embodiment 5-3, the bonding portion 3' of the paper cup E is rolled inward, so that when the contents are put and heated and cooked in a microwave oven, it is pressed against any portion of the paper cup. There was no occurrence. In addition, by attaching the heat insulation cover 4 made of corrugated cardboard to the trunk portion 11, the contents heated with heat insulating properties do not cool well and the contents do not feel hot. Could take H ').

As described above, according to the first microwave paper cup of the present invention, when the contents of a beverage or instant food, etc. are put into a paper cup and heated and cooked in a microwave, a microwave paper cup is not produced. .

According to the second microwave paper cup of the present invention, when the contents such as beverages or instant foods are put into the paper cup and heated and cooked in a microwave oven, a paper cup for microwave oven can be obtained. Moreover, since the space is formed between the bent part of the edge part and the bottom part of the bottom member of the second microwave paper cup of the present invention, when placed on a flat surface, the heat of the contents does not run off well. .

In the third paper cup for a microwave oven of the present invention, a bent portion is formed by bending the lower portion of the paper cup rim inward, and a convex portion having a convex shape is formed in the inner central portion of the bottom portion toward the inner side, whereby the microwave cup is provided. When the contents are put inside the oven and used in a microwave oven, at the bottom part, the shape of the convex portion of the convex shape toward the inside is reversed to become the convex shape toward the outside, and there is a danger of pressing the edge of the paper cup for the microwave oven. Very few microwave paper cups.

In the method for manufacturing a microwave paper cup according to the present invention, the lower portion of the paper cup rim is bent inward to form a bent portion, and at the press-molded portion of the press mold, the air vent hole is not formed, and the accommodating portion is in the shape of a hollow cylinder. By forming the air exhaust hole, it has the effect of easily forming a convex portion having a convex shape toward the inside at the inner central portion of the bottom member bottom portion with increasing the internal pressure.

According to the first microwave-compatible paper cup of the present invention, by folding the trunk member and the bottom member of the paper cup back inward to form a bottom return portion, the height of the edge portion is lowered, and the bottom portion of the bottom member is concave downward. When forming a cup, the contents of a beverage or instant food, etc. are placed inside the paper cup, and when heated and cooked in a microwave oven, a microwave-compatible paper cup can be obtained in which the contents do not leak and no pressing occurs in any part of the paper cup. Further, by attaching a heat insulation cover made of a material having heat insulation to the body portion, it is possible to obtain a microwave-compatible paper cup which can be held by hand without the heated contents cooling well and the contents not feeling hot.

According to the second microwave oven-compatible paper cup of the present invention and a method for manufacturing the same, the joint portion of the body member and the bottom member is rolled inward to form a bottom curled portion, so that it can be approximately 1/2 or less of the height of a conventional edge portion. When the contents of a drink or instant food, etc. are put inside a paper cup and heated and cooked in a microwave oven, the paper cup corresponding to a microwave oven which does not generate a press can be obtained. In addition, such a microwave-compatible paper cup has an effect of having high stability when placed on a flat surface and a bottom surface portion not contacting the flat surface, so that the heat of the contents does not run off well.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows the paper cup for microwave ovens of 1st Embodiment of this invention.

It is sectional drawing which shows the paper cup for microwave ovens of 2nd Embodiment of this invention.

Fig. 3 is a developed view showing the blank of the trunk member and the blank of the bottom member of the paper cup for a microwave oven according to the present invention.

4 is a view showing a step of making a paper cup for a microwave oven according to the present invention.

Fig. 5 is a partially cutaway cross-sectional view showing a state in which a heat insulation cover is wound around the paper cups for microwave ovens of the first and second embodiments of the present invention.

It is a partial sectional drawing which shows the various examples of the trunk | drum part in the state which wound the heat insulation cover to the paper cup for microwave ovens of 1st Embodiment of this invention.

It is sectional drawing which shows the paper cup for microwave ovens of 3rd Embodiment of this invention.

It is sectional drawing which shows the other example of the paper cup for microwave ovens of 3rd Embodiment of this invention.

9 is a partial cross-sectional view of the edge portion of the paper cup for a microwave oven according to the third embodiment of the present invention.

It is a figure which shows the paper cup for microwave ovens of 4th Embodiment of this invention.

It is sectional drawing which shows the state which wound the heat insulation cover in the paper cup for microwave ovens of 3rd Embodiment of this invention.

It is a partial sectional drawing which shows the various examples of the trunk | drum part in the state which wound the heat insulation cover to the paper cup for microwave ovens of 3rd Embodiment of this invention.

FIG. 13 is a partial cutaway cross-sectional view showing a paper cup for a microwave oven according to a fifth embodiment of the present invention; FIG.

14 is a partially enlarged cross-sectional view of a paper cup for a microwave oven according to a fifth embodiment of the present invention.

Fig. 15 is a partially enlarged cross-sectional view showing various examples of the bent portion of the paper cup for a microwave oven according to the fifth embodiment of the present invention.

It is a figure which shows the process of making the paper cup for microwave ovens by the 5th Embodiment of this invention.

It is a partial cutaway sectional drawing which shows the state which wound the heat insulation cover in the paper cup for microwave ovens by 5th Embodiment of this invention.

It is a partial sectional drawing which shows the various examples of the trunk | drum part in the state which wound the heat insulation cover to the paper cup for microwave ovens by 5th Embodiment of this invention.

Fig. 19 is a partially cutaway cross-sectional view showing a paper cup corresponding to a microwave oven according to a sixth embodiment of the present invention.

20 is a partial cross-sectional view showing a microwave cup corresponding to a microwave oven according to a seventh embodiment of the present invention.

Fig. 21 is a partial cutaway cross-sectional view of an intermediate step of the microwave oven-compatible paper cup according to the seventh embodiment of the present invention.

It is a figure which shows the process of creating the microwave oven correspondence paper cup which concerns on 6th Embodiment of this invention.

It is a figure which shows the process of creating the microwave oven correspondence paper cup which concerns on 7th Embodiment of this invention.

It is sectional drawing which shows the state which wound the heat insulation cover to the microwave oven compatible paper cups by 6th and 7th embodiment of this invention.

Fig. 25 is a partial cross-sectional view showing an example of a body portion in which a heat insulation cover is wound on a microwave-compatible paper cup according to a sixth embodiment of the present invention.

Fig. 26 is a partial cutaway cross-sectional view showing a microwave oven-compatible paper cup according to an eighth embodiment of the present invention.

Fig. 27 is a partially cutaway sectional view of the paper cup on which the microwave oven-compatible paper cup according to the eighth embodiment of the present invention is based.

Fig. 28 is a partially cutaway cross-sectional view showing a paper cup corresponding to a microwave oven according to a ninth embodiment of the present invention.

It is a figure which shows the process of producing the microwave oven compatible paper cups by 8th and 9th embodiment of this invention.

It is sectional drawing which shows the state which wound the heat insulation cover to the microwave oven compatible paper cups by 8th and 9th embodiment of this invention.

It is a partial sectional drawing which shows the example of the trunk | drum part in the state which wound the heat insulation cover to the microwave oven compatible paper cup which concerns on 8th Embodiment of this invention.

32 is a partial cutaway cross-sectional view showing a conventional paper cup.

33 is a partial cross-sectional view showing a conventional paper cup for a microwave oven.

Claims (9)

In a paper cup consisting of a body member and a bottom member is formed by folding the rim portion joining the body member and the bottom member inward, the folded portion of the rim portion is substantially parallel to the bottom surface of the bottom member, the foldable portion A paper cup for a microwave oven, wherein a space is formed between the bottom member and the bottom member. The method of claim 1, A paper cup for a microwave oven, wherein the bottom surface of the bottom member is concave in an inward direction of the paper cup. In a paper cup consisting of a body member and a bottom member, the lower portion of the edge portion joining the body member and the bottom member is bent at least 90 degrees inward so that the tip portion of the edge portion has an inclination angle with respect to the vertical direction to form a bent portion. A paper cup for a microwave oven, with a space formed between the bent portion and the bottom member. A paper cup for a microwave oven in which a bottom portion of a rim joining the body member and the bottom member is bent inward to form a bent portion in a paper cup comprising a body member and a bottom member. A paper cup for a microwave oven, wherein a space is formed between the bent portion and the bottom member, and the gap width of the space is 5 mm or less at the maximum portion. The method according to claim 3 or 4, A paper cup for a microwave oven having a concave wedge installed in the bent portion. delete delete delete delete

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