JP5797588B2 - Container and container manufacturing method - Google Patents

Description

  The present invention provides a container having a cylindrical body formed of a sheet-like material and forming a side seam, and a bottom made of a sheet-like material and attached in a state of being raised at the inside of the body, and like this The present invention relates to a manufacturing method for a container.

  Conventionally, a container made of a sheet-like material and having a body portion and a bottom portion is used, for example, for a drinking cup. In recent years, these containers have also been used as cooking containers in combination with ingredients. They are used for cooking by pouring hot water into the ingredients in the container, or a microwave oven for each container. Some of them are used for cooking by heating food with microwaves.

  For example, as is known in Patent Document 1, such a container is typically a cylindrical shape in which a seam (hereinafter referred to as “side seam”) in which side end portions of a sheet-like material are laminated and bonded together is formed. And a bottom part made of sheet-like material and attached in a state where the bottom is raised inside the trunk part, and the bottom part has a bent part bent downward from its outer peripheral edge. The part is bonded to the inner wall of the body part. Furthermore, the trunk portion has a folded portion that is folded upward at the lower end thereof, and the folded portion sandwiches the bent portion of the bottom portion and is crimped to the bent portion. The bent portion and the trunk portion of the bottom portion By press-bonding with the lower part including the folded portion, the yarn bottom of the container is formed and liquid or the like is prevented from leaking from the container. In order to crimp the bent part of the bottom part and the lower part including the folded part of the body part, a roll-out method or an expander method is used, and in either method, a pressurizer disposed inside the yarn bottom is used. The bottom bent portion and the lower portion including the folded portion of the body portion are pressurized.

JP 2007-91323 A (FIG. 7 (c), FIG. 8, FIG. 9)

  By the way, the side seam part of the body part is thicker because the side edge part is overlapped compared to other parts, and the body part is folded at the bottom of the thread, so that the body part is A step corresponding to the thickness of two sheets of the sheet-like material to be formed is generated. For this reason, it is difficult to sufficiently pressurize the portion in the vicinity of the step at the time of crimping the yarn bottom, and there is a problem that the crimping in the vicinity of the step may be incomplete. Further, since the bent portion at the bottom is sandwiched between the folded portions and the bent portion cannot be directly pressurized, there is a possibility that unintended wrinkles may occur in the bent portion. Although such wrinkles are hidden inside, crimping may be incomplete, which may cause poor adhesion between the body and the bottom and poor attachment.

  In addition, since it is necessary to ensure that the folded portion of the trunk portion overlaps with the bent portion of the bottom portion, there is a problem that the amount of folding at the lower end of the trunk portion increases and the material used for the trunk portion increases. .

  The present invention has been made in view of such a situation, and a container capable of preventing the occurrence of problems when crimping the yarn bottom and eliminating waste of material used for the body part, and the container. It is an object of the present invention to provide a manufacturing method.

The present invention has been made in view of the above problems, and is a cylindrical body formed of a sheet-like material to form a side seam;
A bottom part made of a sheet-like material and attached in a state where the bottom is raised inside the trunk part,
A container having a thread bottom formed at the bottom of the body part,
The bottom portion has a bent portion formed by folding the outer peripheral edge downward, and the bent portion is bonded to the inner wall of the trunk portion,
An end portion processing portion in which an end portion of the sheet-like material is processed is formed at a lower end of the body portion, and the end portion processing portion is not bonded to the bent portion.

Further, the present invention is pre-Kitan portion processing section is characterized in that the lower end of the body portion is configured folded back.

The present invention also folded portion of pre Kitan section processing unit, characterized in that it is adhered to the inner wall of the barrel.

Further, the present invention has an upper end of the folded portion of the pre-Kitan section processing unit, characterized in that it is positioned below the lower end of the bent portion of the bottom portion.

Further, the present invention is pre-Kitan portion processing section, the lower end of the body portion, characterized in that it is constituted by the curl.

Further, the present invention is, before Symbol bottom, characterized in that recess by recessing downward is formed.

In addition, the present invention comprises a cylindrical trunk formed of a sheet-like material to form a side seam, and a bottom attached from the sheet-like material in a state of being raised at the inside of the trunk, A method of manufacturing a container in which a yarn bottom is formed at a lower part of a body part,
A side seam is formed by adhering the side edge portions of the body blank constituting the body part,
Forming a bent portion by narrowing the outer peripheral edge of the bottom blank constituting the bottom,
Bonding the bent part to the inner wall of the body part, processing the end part on the bottom side of the body part to form an end processing part, forming a yarn bottom,
By pressurizing the yarn bottom, the bent portion and the body portion are pressure-bonded, while the end treatment portion is not bonded to the bent portion.
It is characterized by that.

  According to the present invention, at the lower end of the body portion, the end processing portion in which the end portion of the sheet-like material is processed is formed, and the end processing portion is not bonded to the bent portion. It is possible to improve the uniformity of the thickness of the portion that constitutes the portion, and to reliably perform the pressure bonding when the bottom portion is attached to the trunk portion, and to prevent adhesion failure and attachment failure.

  Furthermore, even when the container according to the present invention is applied to a heating container for a microwave oven, since fluctuations in the thickness of the yarn bottom are suppressed, heat accumulation on the yarn bottom is prevented, and the occurrence of scorching of the yarn bottom is suppressed. can do.

It is an external view of the container which concerns on embodiment of this invention. In the container of embodiment of this invention, it is a partial expanded sectional view which shows the attachment state of a trunk | drum and a bottom part. (A) is the fragmentary sectional view seen along the 3-3 line of FIG. 1, (b) is a corresponding fragmentary sectional view of the conventional container. It is a flowchart which shows the manufacturing process of the container which concerns on embodiment of this invention. It is a partial expanded sectional view which shows the modification of the edge part process part in the container of embodiment of this invention. It is a partial expanded sectional view which shows the modification of the edge part process part in the container of embodiment of this invention. It is a partial expanded sectional view which shows the modification of the edge part process part in the container of embodiment of this invention. It is a partial expanded sectional view which shows the modification of the edge part process part in the container of embodiment of this invention. It is a partial expanded sectional view which shows the modification of the edge part process part in the container of embodiment of this invention. It is a partial expanded sectional view which shows the modification of the edge part process part in the container of embodiment of this invention. It is a partial expanded sectional view which shows the modification of the edge part process part in the container of embodiment of this invention. It is a partial expanded sectional view which shows the modification of the edge part process part in the container of embodiment of this invention. FIG. 3 is a cross-sectional view corresponding to FIG. 2 illustrating a modification of the container of the present invention.

  Hereinafter, a container according to the present invention will be described with reference to the drawings.

  1 and 2 show a container according to an embodiment of the present invention.

  The illustrated one can be used as, for example, a paper cup for beverages, but is not limited to this, and can be used as a container for cooking, and the ratio of the height and opening of the container is arbitrary. Can be changed.

  As shown in FIG. 1, the container 10 according to the embodiment of the present invention includes a trunk portion 20 and a bottom portion 30.

  The body 20 is formed with a side seam 21 in which side end portions of a body blank of a fan-like or rectangular sheet-like material are overlapped and bonded to each other. By forming the side seam 21, the body portion 20 has a cylindrical shape in which openings 22 and 23 facing vertically are defined. Note that, depending on the shape of the body blank, the body 20 can be designed to have a tapered shape that is gradually reduced in diameter from the upper opening 22 toward the lower opening 23.

  A curl wound outward is formed at the end of the body portion 20 on the upper opening 22 side, and a bottom portion 30 is attached to the inside of the body portion 20 on the lower opening 23 side.

  The bottom portion 30 has a bent portion 31 in which an outer peripheral edge of a bottom blank of a circular sheet-like material is bent downward, and the bent portion 31 is bonded to the lower inner wall of the trunk portion 20. The bottom portion 30 is bonded to the inner wall of the trunk portion 20 in a state where the bottom portion 30 is raised, whereby the yarn bottom 40 is formed by the lower portion of the trunk portion 20 and the bent portion 31 of the bottom portion 30.

Although the trunk | drum 20 and the bottom part 30 can be comprised from each arbitrary sheet-like material, for example, the polyethylene formed in at least one surface of the paper layers 200 and 300 each made of paper, and the paper layers 200 and 300, respectively. Further, a laminated sheet-like material composed of laminate layers 202 and 302 made of thermoplastic resin such as polypropylene or polyester can be used. The paper layers 200 and 300 can have a basis weight of 150 to 300 g / m ² and a thickness of 250 to 400 μm, and the laminate layers 202 and 302 can have a thickness of 20 to 80 μm. The main material can be a paper layer, but in addition to this, as a main material or as an additional layer, it is also possible to provide a synthetic resin layer or a foamed layer, It is also possible to do. Or a sheet-like material can also be comprised only from a synthetic resin.

  Here, the periphery of the yarn bottom 40 where the bent portion 31 is bonded to the inner wall of the body portion 20 will be described with reference to FIG.

  In the bent portion 31 of the bottom portion 30, the laminate layer 302 is bonded to the inner wall of the trunk portion 20. The adhesive length 44 in the height direction of the bonded portion 42 at this time is preferably configured to be, for example, 4 mm or more, and thereby, the space between the bottom portion 30 and the trunk portion 20 is surely sealed. It is possible to prevent the liquid in the container from leaking out.

  Further, an end processing unit 26 subjected to end surface processing, for example, folding processing, is formed at the end of the body portion 20 on the bottom 30 side. The end processing portion 26 is folded upward, and the laminate layer 202 is bonded to the inner wall of the body portion 20. Here, although the end processing unit 26 is folded upward, the end processing unit 26 does not reach the bent portion 31 and does not sandwich the bent portion 31. Therefore, the end processing portion 26 is not bonded to the surface opposite to the bonding surface of the bent portion 31, and the upper end of the folded portion of the end processing portion 26 is slightly isolated from the bent portion 31. Is positioned. The length in the height direction of the folded portion of the end processing unit 26 is configured to be, for example, 1 mm to 4 mm.

  Next, the manufacturing method of the container 10 is demonstrated with reference to FIG. FIG. 4 is a flowchart showing the manufacturing process of the container 10.

  The sheet-like material which comprises the trunk | drum 20 and the bottom part 30 is prepared (step S101). Next, a fan-shaped (or rectangular) body blank is punched from the sheet-shaped material (step S102). Similarly, a circular bottom blank is punched from the sheet-like material (step S103), and further, the outer peripheral edge of the bottom blank is squeezed to form the bent portion 31 (step S104).

  The body blank is heated and wound around the side edge, and the side edges are bonded to each other by the melted laminate layer to form the side seam 21, thereby producing the cylindrical body 20 (step S105). Next, the bent portion 31 of the bottom portion 30 and the lower end of the body portion 20 are heated, and the bent portion 31 of the bottom portion 30 is bonded to the inner wall of the body portion 20 by the molten laminate layer, and the lower end of the body portion 20 is folded back. The end portion 26 is formed by bonding the folded portion to the inner wall of the body portion 20, thereby forming the yarn bottom 40 (step S106). Then, by pressurizing the formed yarn bottom 40 from the inside using a pressurizer, the bonded portion is crimped to finish the yarn bottom (step S107).

  Further, a curling process is performed to wind the end portion on the upper opening 22 side of the body portion 20 outward to form a curl (step S108). Thus, the container is completed.

  Optionally, a cylindrical sleeve can be attached to the outside of the barrel 20 of the completed container by bonding, press fitting, or the like. The sleeve can be provided with a heat insulating effect by being attached so as to form a gap between the sleeve and the container.

  According to the container 10 manufactured and configured as described above, the turn-up of the end portion processing portion 26 of the trunk portion 20 is bonded to the inner wall of the trunk portion 20 and does not reach the bent portion 31, and is bent. Since the portion 31 is in a non-adhered state, the variation in thickness at the yarn bottom 40 is small, thereby preventing the occurrence of problems when the bottom portion 30 is crimped to the body portion 20. Can do.

  This is illustrated and described. As shown in FIG. 3B, if the bent portion 31 is sandwiched by the end processing portion 26, the side seam of the trunk portion is formed in the vicinity of the side seam 21 of the trunk portion. A step corresponding to two sheets of material is formed between the corresponding portion and the portion that is not, and on the thin side in the vicinity of the step, pressure is not sufficiently applied, and the bent portion 31 at the bottom is The phenomenon of meandering inside the body 20 and forming unintended wrinkles is likely to occur. There is a possibility that voids are generated in the wrinkle portion, and there is a possibility that adhesion failure and attachment failure may occur.

  On the other hand, in the present embodiment, as shown in FIG. 3A, since the end processing portion 26 does not sandwich the bent portion 31, the bent portion 31 is located near the side seam 21 of the trunk portion 20. The level difference formed at the portion where is adhered is one sheet material. Moreover, since both the bending part 31 and the edge process part 26 are directly crimped | bonded by a pressurizer, it can prevent that the wrinkles and space | gap which are not intended can generate | occur | produce. Then, the bent portion 31 and the inner wall of the trunk portion 20 can be securely bonded.

  In addition, the stability when the container 10 is placed on a flat surface is improved by the end processing unit 26, and even if there is liquid or the like on the flat surface by the end processing unit 26, This liquid can be prevented from permeating from the end surface of the body portion 20 which is the cut surface of the sheet-like material.

  Moreover, since the amount of folding of the end portion processing unit 26 can be suppressed, less material is used for the body portion 20, and the material cost can be reduced.

  Furthermore, when the container according to the present invention is applied to a container for cooking in a microwave oven, an effect of preventing the yarn bottom 40 from being burned can be obtained. In recent years, microwave ovens have a tendency to increase output and conserve energy by concentrating microwaves in the center of the range cabinet. The yarn bottom 40, particularly near the top and bottom center of the yarn bottom, is away from the contents in the container and has little heat exchange despite the microwaves reaching from both inside and outside. In addition, since the folded portion at the lower end of the trunk portion sandwiches the bent portion at the bottom (see FIG. 3B), there is a problem that heat is likely to be trapped and burnt easily. According to the configuration of this embodiment, the bent portion 31 of the bottom portion 30 is not sandwiched between the end processing portions 26 in the vicinity of the center of the top and bottom of the yarn bottom 40, so that heat is easily dissipated without being trapped inside the yarn bottom 40, The occurrence of scorching can be prevented.

  Moreover, when providing a sleeve outside the trunk | drum 20, in order to improve heat dissipation, it is good to position the lower end of a sleeve so that it may become above a yarn bottom.

  Next, a modification of the end processing unit 26 will be described with reference to FIG. 5A to H show a modification of the end processing unit 26 of the container 10 according to the above-described embodiment.

  The end portion processing unit 26 a shown in FIG. 5A is a curl that is wound inside the trunk portion 20. This curl does not necessarily have to be adhered to the inner wall of the body portion 20.

  The end processing portion 26b shown in FIG. 5B is gently folded back inside the body portion 20 and winds the lower end of the bent portion 31 of the bottom portion 30. However, the folded portion of the end processing portion 26 b is formed so as to maintain a gap with the bottom portion 30, and is not bonded to the bent portion 31.

  The end processing portion 26c shown in FIG. 5C is folded back approximately 90 degrees and is formed so as to be substantially parallel to the bottom surface 34 of the bottom portion 30.

  In the end processing portion 26d shown in FIG. 5D, the folded portion is formed so as to overlap the bent portion 31. However, the end processing portion 26 and the bent portion 31 are not bonded. In such a configuration, for example, a non-adhesive layer 304 made of a material having a melting point higher than that of the material constituting the laminate layer 302 is formed on the lower surface side of the sheet-like material of the bottom portion 30, and the laminate layer of the trunk portion 20 is formed. Can be manufactured by the same procedure as the conventional manufacturing method by not heating or by not providing a laminate layer on the body portion 20. As a result, the end processing portion 26 is not bonded to the bent portion 31 during crimping.

  In the case of the example of FIG. 5D, the bent portion 31 is pressed through the folded portion of the end processing portion 26 during the pressure bonding, but the end processing portion 26 and the bent portion 31 are not bonded, so that the bent portion 31 is bent. The portion 31 is not constrained by the end processing portion 26, and therefore, unintended bending of the bent portion 31 can be suppressed.

  The end processing portion 26e shown in FIG. 5E is a curl that is wound around the outside of the body portion 20.

  The end processing portion 26f shown in FIG. 5F is obtained by further pressing the curled portion of FIG. 5E.

  The end processing portion 26g shown in FIG. 5G is folded back to the outside of the trunk portion 20, and the folded portion is bonded to the outer wall of the trunk portion 20.

  The end processing unit 26h shown in FIG. 5H is an example in which a skive process or the like is performed on the end instead of turning back the lower end of the body unit 20.

  The end processing unit 26 is not limited to the above, and may have any configuration within the scope described in the claims.

  Moreover, in the container 10 demonstrated above, it is also possible to apply a synthetic resin material having a relatively high strength as the sheet-like material of the bottom portion 30, thereby improving the strength of the bottom portion 30 and solidifying ice or the like. The present invention can be applied as a container for storing or transporting an object, or as a container for providing a solid material such as ice by dropping it into the container.

  FIG. 6 is a further modification of the embodiment of FIG. 1, and the container 11 of this example has a concave portion 36 that is recessed downward on the bottom surface 34 of the bottom portion 30. Other configurations are the same as those in FIG.

  According to such a container 11, when it applies to the container for cooking of a microwave oven, while improving the heating efficiency by a microwave oven, generation | occurrence | production of the bottom of a thread | yarn can be suppressed more reliably.

  In the container 11, by designing the recess 36 to have an appropriate shape, the food stored in the container 11 can be arranged so as to gather at the center of the container 11, and the heating efficiency can be improved. By lowering the center of gravity of the container 11 for storing the foodstuff, the stability when the container is placed on a flat surface can be improved and the fall can be prevented.

  As the space in the container 11 increases, the upper space, so-called head space, increases. The increase in the head space can contribute to alleviation of impact when the food and liquid in the container 11 boil, use for disposing different foods, prevention of leakage when the container 11 is transported, and the like.

  Moreover, even if the bonded part 42 between the trunk | drum 20 and the bottom part 30 fuse | melts by heating during cooking, the recessed part 36 is received by the saucer etc. of a microwave oven, and the bottom part 30 is large. Displacement can be prevented. Further, by concealing the inner part of the yarn bottom 40 by the recess 36, the appearance can be improved.

10, 11 Container 20 Body 21 Side seam 26, 26a to 26h End treatment part 30 Bottom 31 Bending part 36 Concave part 40 Yarn bottom

Claims (4)

A cylindrical trunk formed of a sheet-like material to form a side seam;
A bottom part made of a sheet-like material and attached in a state where the bottom is raised inside the trunk part,
A container having a thread bottom formed at the bottom of the body part,
The bottom portion has a bent portion formed by folding the outer peripheral edge downward, and the bent portion is bonded to the inner wall of the trunk portion,
The lower end of the barrel, the ends of the sheet-like material is formed the end portion processing unit that has been treated, the end processing unit, the Ri bent portion and the non-adhesive der, the lower end of the body portion folded back The container is configured such that the upper end of the folded portion is positioned below the lower end of the bent portion of the bottom portion . Folded portion of the end processing unit, a container according to claim 1, characterized in that it is adhered to the inner wall of the barrel. Wherein the bottom portion, the container according to claim 1 or 2, characterized in that recess by recessing downward is formed. A cylindrical body formed of a sheet-like material to form a side seam, and a bottom made of a sheet-like material and attached in a state of being raised at the inside of the body. A method for producing a container formed of
A side seam is formed by adhering the side edge portions of the body blank constituting the body part,
Forming a bent portion by narrowing the outer peripheral edge of the bottom blank constituting the bottom,
The bent portion is bonded to the inner wall of the barrel portion, the lower end of the barrel portion is folded back, and the upper end of the folded portion is positioned below the lower end of the bent portion of the bottom portion to form an end processing portion. To form the thread bottom,
By pressurizing the yarn bottom, the bent portion and the body portion are pressure-bonded, while the end treatment portion is not bonded to the bent portion.
A method for producing a container characterized by the above.

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