JP2007176604A - Heat-insulating paper cup - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat-insulating paper container which is easily disposable and easily burnable because is mainly made of paper, and which hardly emits a malodor. <P>SOLUTION: A curved part 21, which is curved inward by pressurization and/or heating and pressurization, is molded in the upper part of a paper cylinder 20; the cylinder 20 is fitted into a barrel part 11 of a paper cup; a lower end of the cylinder, in which the curved part is formed, is fixed to an outer surface of an annular leg part 14 of a lower edge of the barrel part of the paper cup; an upper end of the cylinder is fixed in the state of being brought into contact with a lower edge of a mouth edge 13 of the barrel part; and a heat-insulating space layer 30, which is spread over the entire perimeter of a paper cup body, is provided between the barrel part 11 of the paper cup body and the paper cylinder 20. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a paper heat insulating cup for storing instant noodles and the like, and more particularly, to a paper heat insulating cup for so-called instant foods and instant beverages that can be poured into hot water and eaten as it is.

  Conventionally, as an insulating container that pours hot water into a container such as instant noodles and eats, for example, a plastic container formed of foamed polystyrene resin or the like, a corrugated paper is attached to the outside of the peripheral wall of a water-resistant processed paper cup body, Furthermore, a paper container or the like in which an air heat insulating layer is formed by sticking thin paper on wavy paper is known.

  However, although the container using foamed resin is excellent in heat insulation, it has high calorie burn, has problems in incineration and disposal, and further, due to changes in consumer behavior due to increased consumer environmental awareness There is a demand for easily disposable and easily combustible containers that replace foamed resins.

  In addition, a paper container in which corrugated paper or thin paper is wound and pasted on a paper cup to form an air heat insulating layer has no problem in heat insulation, but an adhesive is used, and therefore a gluing step is required.

  The present invention has been made by paying attention to the above-mentioned problems related to a heat-insulating container. A paper heat-insulating cup having paper as a main material, easy to dispose of, easy to burn, and no risk of odor generation. The purpose is to provide.

  According to a first aspect of the present invention, there is provided a paper cup main body comprising a body portion and a bottom portion, having a mouth edge portion whose outer periphery is curled outward, and having an annular leg portion formed at a joint portion between the body portion and the bottom portion. , A paper heat-insulating cup composed of a paper cylinder fitted to the outside of the body portion of the paper cup body, the surface of the paper cylinder is formed flat, and the lower part is pressed and / or heated and pressurized A bent part that bends inward is formed, the cylinder is fitted into the body of the paper cup body, and the lower end of the cylinder that forms the bent part is fixed to the outer surface of the annular leg at the lower edge of the paper cup body, The paper is characterized in that the upper end of the cylindrical body is fixed in contact with the lower edge of the mouth portion of the body part, and a heat insulating space layer is provided between the paper cup body body part and the paper tube body over the entire circumference of the paper cup body. A heat insulating cup.

  According to a second aspect of the present invention, in the first aspect of the present invention, a bent portion that bends inward by pressurization and / or heating and pressurization is formed on the upper portion of the paper tube body, and the upper end of the bend portion is formed on the body portion A heat insulating cup made of paper, which is fixed to the outer surface of the body at the lower end of the mouth edge.

  Further, in a third invention according to the first invention, a curved edge portion curled inwardly is formed on an upper peripheral edge of the paper cylinder, and an inner surface of the curved edge portion is a lower end of a mouth edge portion of the trunk portion. It is the paper heat insulation cup characterized by being fixed to the outer surface of the trunk | drum.

  According to a fourth aspect of the present invention, in the third aspect of the present invention, the curved edge portion is pressed and crushed flatly in the vertical direction to form a flat curved edge portion, and the inside of the flat curved edge portion and the body portion of the paper cup body. A heat insulating cup made of paper, characterized in that the outside is bonded to the outside of the body portion of the paper cup body through an adhesive.

  According to a fifth aspect of the present invention, there is provided the paper heat insulating cup according to the first aspect, wherein an annular ridge protruding outward is formed above the body portion.

  Still further, a sixth invention is the paper heat insulating cup according to the first invention, wherein an annular step portion extending outward is formed above the body portion.

  As described above, according to the present invention, since the bent portion that bends inward is provided at the lower portion of the paper tube body, a heat insulating space layer is formed between the paper cup body barrel portion and the paper tube body.

  Further, by forming a bent portion that bends inwardly at the top of the paper tube body or by forming a curved edge portion that is curled inside, a heat insulating space between the paper cup body barrel and the paper tube body The layer can be thickened.

Also, by forming a curved edge part curled inward on the upper part of the paper cylinder, or by pressing the curved edge part curled inward from the inside to the outside, it is flattened in the vertical direction, The lateral pressing strength (lip strength) of the paper heat insulating cup is improved.
In particular, the curved edge curled inwardly is pressed and flattened in the vertical direction, and the inside of the crushed curved edge and the outside of the paper cup body trunk are connected via an adhesive applied to the outside of the paper cup body trunk. When bonded, the lateral pressing strength is further improved.

  The lateral pressing strength (lip strength) is the strength in the lateral pressing direction of the cup lip, and is a quality item that is particularly required in the case of heat-insulating cups for instant noodles. Hold the cup by hand. When eating, if the lip strength is weak, the cup will be deformed when held by hand, making it difficult to eat, and the contents will easily spill.

  Furthermore, by providing an annular ridge on the body portion of the paper cup body, the cup will not dent even if the heat insulating space layer in that portion is gripped with fingers or the like.

As described above, the paper heat insulating cup of the present invention may be composed of two parts, that is, a paper cup body and a paper tube body, and the paper tube body is only attached and pressed, so that it can be manufactured at low cost.
The paper cylinder forms a curved part, and the lower end of the curved part is in contact with the body part of the paper cup, so the strength is high and it is difficult to deform even when force is applied to the paper cylinder from outside, and it is always good A good heat insulating effect and appearance.

Hereinafter, the present invention will be described in detail by way of examples.
As shown in FIG. 1, for example, the paper heat insulating container of the present invention includes a body 11 and a bottom 12, and has an opening 13 with a peripheral edge of the opening curled outward, and a joint between the body and the bottom. The paper cup main body 10 in which the annular leg part 14 is formed, and the paper tube body 20 fitted to the outer side of the body part of the paper cup.

The paper cup main body 10 has a body member that forms the body part and a bottom member that forms the bottom part, and a low-density polyethylene resin is applied on both sides or one side of a paper cup base paper having a basis weight of about 170 to 400 g / m ² about 10 to 50 μm. The processed polyethylene paper can be set in a general paper cup molding machine.

The paper cylinder 20 is punched into a substantially fan shape having a predetermined size with a size covering the body of the paper cup body, using a paperboard such as a coated ball, a white liner, and a cup base paper having a basis weight of about 190 to 420 g / m ^2. A paper cylinder blank is produced.

  In addition, when a cup base paper is used, since a pulp is easy to extend and it is rich in a moldability, the curved part mentioned later is easy to shape | mold.

  Next, both ends of the paper cylinder blank are overlapped and bonded via, for example, an ethylene / vinyl acetate resin emulsion adhesive, and processed into a cylindrical shape.

  Or you may apply | coat low density polyethylene resin to the back surface of a paper-made cylinder blank, make it adhere | attach with a heat | fever, and process it into a cylinder shape.

  A cylindrical body processed into a cylindrical shape is pressed and / or heat-pressed using a male and female mold to form a paper cylinder 20 having a bent portion 21 bent inward at the lower portion of the sleeve.

The upper part of the paper cylinder is formed with a bent portion 22 that bends inward by pressurization and / or heating and pressurization in the same manner as the lower portion (see FIG. 2), and the curved edge portion is longitudinally directed from the inside to the outside. When the cover member is not required to be heat-sealed in the opening of the paper cup body, the paper cup is sealed when the cover member is sealed. Since a neck support for holding the main body is not necessary, it is conceivable to form a curved edge portion 24 curled inside (see FIG. 3).
Of course, it is necessary to set the margin for this in the paper cylinder blank beforehand.

  As a method for forming the flat curved edge 25 by flattening the curved edge in the vertical direction, for example, an expansion member is inserted into the cylindrical body, and the curved edge is crushed by expanding the expansion member. A known method or apparatus may be used, such as crushing while rotating a member, or pushing a member having an outer diameter slightly larger than the inner diameter of the curved edge of the cylinder while pushing the member into the cylinder.

  The paper tube 20 is fitted into the paper cup body 10 as follows. That is, the paper cup is fitted into the paper cylinder from the bottom, and the upper end of the paper cylinder is fixed in contact with the lower edge 13 of the paper cup, or the lower end of the outer edge 13 It fixes to an outer surface and the lower end of a paper cylinder is fixed to the outer surface of the annular leg part of a paper cup, and it is set as the paper heat insulation cup of this invention. As a fixing method of the paper cylinder and the paper cup, a method of adhering either one or both of the upper end and the lower end of the paper cylinder to the paper cup with, for example, an ethylene / vinyl acetate resin-based emulsion adhesive is reliable. However, when a low-density polyethylene resin is applied to the back surface of the paper cylinder, a method of heat-sealing the paper cup body and the paper cylinder without using an adhesive may be used.

In addition, the method of fixing the paper tube body and the paper cup body trunk when the curved edge is crushed flat in the vertical direction to form the flat bend 25 is the same as that of the paper tube outside the paper cup body. For example, an ethylene / vinyl acetate resin emulsion adhesive is applied to the entire area in the circumferential direction in advance on the flat curved edge, and the paper cylinder is fitted from the bottom of the paper cup body and bonded and fixed. Good to do. Since the curved edge is flattened, the bonding area is increased, the adhesive does not protrude, and the lip strength is improved.
Further, the lower end of the paper tube body may or may not be fixed to the outer surface of the annular leg portion of the paper cup body.

  Further, the paper cup main body 10a, 10b in which the annular ridge 15 projecting outward is formed above the body part of the paper cup main body or the annular step 16 extending outward is formed. The paper cylinder 20 on which the portion 21 is formed may be fitted by the method described above (see FIGS. 4 and 5).

Examples of the present invention will be described more specifically below.
<Experiment 1> Thermal insulation

First, a polyethylene processed paper obtained by applying a low-density polyethylene resin having a thickness of 40 μm to one side of a cup base paper having a basis weight of 280 g / m ² as a body member forming the body portion, and a basis weight of 270 g as a bottom member forming the bottom portion. / M ² cup base paper, each side of 35μm thick low-density polyethylene resin coated polyethylene processed paper was prepared, using a common paper cup molding machine, polyethylene inside, 105mm height, caliber A paper cup main body 10 having a diameter of 140 mm, a bottom diameter of 100 mm, and a height (depth) of the annular leg portion of 10 mm was formed.

Separately, using a coated ball having a basis weight of 310 g / m ² , a fan-shaped paper cylinder blank having a predetermined size was prepared, and both ends of the fan-shaped cylinder blank were overlapped to form an ethylene / vinyl acetate resin-based emulsion-type adhesive. It was bonded via an agent and formed into a sleeve shape having an upper diameter of 130 mm, a lower diameter of 104 mm, and a taper angle of 7.0 °.

  Subsequently, a male blank and a female die were used for the cylindrical blank formed into a sleeve shape. Mold temperature: 90 ° C., drawing pressure: 400 kgf, drawing molding time: 0.2 sec. The paper cylinder 20 having the upper caliber 130 mm, the lower caliber 100 mm, and the maximum squeezing depth (one side) 2 mm and the bent portion 21 formed on the lower side was molded.

  Next, the paper cup body is fitted into the paper cylinder from the bottom, the upper end of the paper cylinder is brought into contact with the bottom edge 13 of the paper cup body, and the lower end of the paper cylinder is an annular shape of the paper cup body. The heat insulating cup made of paper of Example 1 having the heat insulating space layer 30 between the trunk portion 11 and the paper tube 20 was fixed to the outer surface of the leg portion via an ethylene / vinyl acetate resin adhesive. (See FIG. 1).

Except having used the paper cylinder produced on the conditions mentioned below, the heat insulation cup is produced on the same material and conditions as Example 1, and the heat insulation space layer is provided between the trunk | drum of a paper cup main body and a paper cylinder. It was set as the paper heat insulation cup of Example 2 (refer FIG. 2).
That is, using a coated ball having the same basis weight of 310 g / m ² as in Example 1, a sector-shaped paper cylinder blank having a predetermined size was prepared, and both ends of the sector-shaped cylinder blank were overlapped to form an ethylene / vinyl acetate resin. It was bonded through an emulsion type adhesive, and formed into a sleeve shape having an upper diameter of 134 mm, a lower diameter of 104 mm, and a taper angle of 7.5 °.

  Subsequently, the cylindrical blank formed into a sleeve shape is subjected to drawing under the same conditions as in Example 1, and curved portions 21 and 22 are provided on the lower side and the upper side with an upper diameter of 130 mm, a lower diameter of 100 mm, and a drawing depth of 2 mm. The formed paper cylinder 20 was molded.

Except having used the paper cylinder produced on the conditions mentioned below, the heat insulation cup is produced on the same material and conditions as Example 1, and the heat insulation space layer is provided between the trunk | drum of a paper cup main body and a paper cylinder. It was set as the paper heat insulation cup of Example 3 (refer FIG. 3).
That is, using a coated ball having the same basis weight of 310 g / m ² as in Example 1, a sector-shaped paper cylinder blank having a predetermined size was prepared, and both ends of the sector-shaped cylinder blank were overlapped to form an ethylene / vinyl acetate resin. It was bonded through a system emulsion type adhesive and formed into a sleeve shape.

Next, an inwardly curled edge 24 having a diameter of about 2 mm is formed at the upper end of the cylindrical blank formed into a sleeve shape while rotating using a male mold and a female mold, and at the bottom of the cylindrical blank. A bent portion 21 similar to that in Example 1 was formed, and a paper cylinder 20 having an upper diameter of 130 mm, a lower diameter of 100 mm, and a maximum drawing depth of 2 mm was formed.

  Using the same material as in Example 1, an annular ridge 15 projecting outwardly with a height (depth) of 1.0 mm and a width of 2 mm was formed on the body portion that was about 5 mm away from the rim. Example 1 except that a paper cup body 10a having a thickness of 105 mm, a diameter of 140 mm, a bottom diameter of 100 mm, and an annular leg height (depth) of 10 mm was molded with a polyethylene inward using a general paper cup molding machine. Using the same paper cylinder 20 as in Example 1, a paper heat insulation cup of Example 4 having a heat insulating space layer between the trunk and the paper cylinder was produced in the same manner as in Example 1 (see FIG. 4).

  Using the same material as in Example 1, an annular stepped portion 16 extending 1 mm on one side was formed on the entire body portion that was about 5 mm away from the mouth edge portion, a height of 105 mm, a diameter of 140 mm, and a bottom diameter The same paper cylinder 20 as in Example 1 except that a paper cup main body 10b having a height of 100 mm and an annular leg height (depth) of 10 mm was molded with polyethylene inside using a general paper cup molding machine. Using the same method as Example 1, the paper heat insulation cup of Example 5 which has a heat insulation space layer between a trunk | drum and a paper cylinder was produced (refer FIG. 5).

  In order to evaluate the heat insulation effect of the five types of paper heat insulation cups thus produced, boiling water was poured into each cup from the top to 10 mm, and the surface temperature of the body portion 50 mm below the lip portion over time. The change due to was measured. The results are shown in Table 1.

表１から考察すると、紙製筒体の材料が同じ場合、表面の温度は断熱空間層の大きさに反比例することがわかる（断熱空間層が小さくなると温度が高くなる）。
《実験２》リップ強度

Considering from Table 1, it can be seen that when the material of the paper cylinder is the same, the surface temperature is inversely proportional to the size of the heat insulating space layer (the temperature increases as the heat insulating space layer decreases).
<Experiment 2> Lip strength

First, a polyethylene processed paper in which a low-density polyethylene resin having a thickness of 30 μm is applied to one side of a cup base paper having a basis weight of 230 g / m ² as a body member forming the body portion, and a basis weight of 210 g as a bottom member forming the bottom portion. / M ² cup base paper prepared on each side of polyethylene processed paper coated with 30μm thick low density polyethylene resin, using a general paper cup molding machine, polyethylene inside, 105mm height, aperture The paper cup main body 10 having 140 mm, a bottom diameter of 100 mm, a neck lower outer diameter of 129 mm, a taper angle of 7.5 °, and an annular leg height (depth) of 10 mm was formed.

Separately, using a coated ball having a basis weight of 270 g / m ² , a fan-shaped paper cylinder blank having a predetermined size was prepared, and both ends of the fan-shaped cylinder blank were overlapped to form an ethylene / vinyl acetate resin-based emulsion-type adhesive. It was bonded via an agent and formed into a sleeve shape having an upper aperture of 133 mm, a lower aperture of 106 mm, and a taper angle of 6.8 °.

  Next, a curved edge portion curled inwardly with a diameter of 4 mm is formed on the upper end of the cylindrical blank formed into a sleeve shape while rotating using a male mold and a female mold, and the same curvature as in the first embodiment is used. Parts were formed.

  Then, the curved edge part curled inward was pressed from the inside to the outside while rotating the knurl and crushed until the thickness in the vertical direction became 1.5 mm to form a flat curved edge part. .

  Finally, an ethylene / vinyl acetate resin emulsion adhesive is applied to the outside of the bottom edge of the trunk of the paper cup body in the circumferential direction, and then the paper cup body is made from the bottom of the paper cylinder. And the upper end (flat curved edge) of the paper tube was in contact with and bonded to the bottom of the mouth edge of the paper cup body to obtain a paper heat insulating cup of Example 6 (see FIG. 6).

  Using the paper cup body and paper cylinder of Example 6, in addition to the bottom of the body cup's mouth edge (under the neck), the outer side of the annular leg also has an ethylene / vinyl acetate resin emulsion type adhesive. Apply the agent in the circumferential direction, and then fit the paper cup body into the paper cylinder from the bottom, and the upper end (flat curved edge) of the paper cylinder contacts the bottom edge of the paper cup body. Then, the lower end of the paper tube was bonded to the annular leg of the paper cup body to obtain a paper heat insulating cup of Example 7 (detailed description is omitted).

  Next, Examples 8 to 11 as comparative examples will be described.

  Using the paper cup body and the paper cylinder of Example 6, an ethylene / vinyl acetate resin emulsion-type adhesive was applied in the circumferential direction only to the outside of the annular leg of the paper cup body, and then the paper cup body was The paper tube was fitted into the paper tube from the side, and the lower end of the paper tube was bonded to the annular leg of the paper cup body to obtain a paper heat insulating cup of Example 8 (detailed description is omitted).

  The paper cup body and the paper cylinder are bonded by the same material and method as in Example 6 except that the diameter of the curved edge of the paper cylinder is 1.5 mm and the curved edge is not flattened. Thus, a paper heat insulating cup of Example 9 was obtained (detailed description is omitted).

  The same paper cup body as in Example 1 and the same paper cylinder as in Example 9 are used, and as in Example 7, below the trunk edge of the paper cup body (under the neck) and outside the annular leg. Apply an ethylene-vinyl acetate resin emulsion adhesive in the circumferential direction, then fit the paper cup body into the paper cylinder from the bottom, and the upper end (flat curved edge) of the paper cylinder The bottom of the paper cup body is brought into contact with and bonded to the bottom edge of the paper cup body, and the bottom end of the paper cup body is bonded to the annular leg portion of the paper cup body to obtain a paper heat insulating cup of Example 10 (detailed description is omitted) ).

  Using the same paper cup main body and paper cylinder as in Example 9, and applying an ethylene / vinyl acetate resin emulsion adhesive in the circumferential direction only on the outside of the annular leg of the paper cup main body as in Example 8, Thereafter, the paper cup body was fitted into the paper cylinder from the bottom, and the lower end of the paper cylinder was bonded to the annular leg of the paper cup body to obtain a paper heat insulating cup of Example 11 (detailed description) Is omitted).

  The lip strengths of a total of six types of paper heat insulating cups of Examples 6 and 7 thus prepared and Examples 8 to 11 as comparative examples, and under the trunk edge of the paper cup main body (lower neck) The degree of protrusion of the adhesive was measured by the following method. The results are shown in Table 2.

Lip strength: Place a paper heat-insulating cup sideways, 30 mm / sec. of
Crush at speed and measure the maximum strength at that time.

  Adhesive sticking out. Visual observation.

表２から考察すると、曲縁部の直径を４ｍｍにして縦方向に１．５ｍｍにまでつぶした偏平曲縁部を設けた紙製断熱カップは、リップ強度が向上するとともに、胴部口縁部の下（首下部）の接着剤のはみ出しがなく、見栄えも良好なことがわかる（実施例６、７）。これは、直径４ｍｍの曲縁部をつぶすことにより紙カップ本体と紙製筒体との接着面積が大きくなり、その結果としてリップ強度が上がると共に接着剤のはみ出しもなくなる。また、直径４ｍｍの曲縁部をつぶすことにより３層部分が増しリップ強度が増加する。

Considering from Table 2, the paper heat insulating cup provided with a flat curved edge portion having a curved edge diameter of 4 mm and crushed to 1.5 mm in the vertical direction has improved lip strength and has a trunk lip portion. It can be seen that there is no protrusion of the adhesive (under the neck) and the appearance is good (Examples 6 and 7). This is because the adhesive area between the paper cup main body and the paper cylinder is increased by crushing the curved edge portion having a diameter of 4 mm. As a result, the lip strength increases and the adhesive does not protrude. Further, by crushing the curved edge portion having a diameter of 4 mm, the three-layer portion is increased and the lip strength is increased.

It is a partial section explanatory view showing an example of the paper heat insulation cup of the present invention. It is a partial cross-sectional explanatory drawing of the paper heat insulation cup of Example 2. FIG. 6 is a partial cross-sectional explanatory view of a paper heat insulating cup of Example 3. FIG. It is a partial cross section explanatory drawing of the paper heat insulation cup of Example 4. FIG. 6 is a partial cross-sectional explanatory view of a paper heat insulating cup of Example 5. FIG. It is a partial cross section explanatory view of the paper heat insulation cup of Example 6.

Explanation of symbols

10, 10a, 10b ········································································································································································ 21 , 22 ... Curved part 23 ... Folded part 24 ... Curved part 30 ... Thermal insulation space layer

Claims (6)

  A paper cup body consisting of a body part and a bottom part, having a mouth edge whose outer periphery is curled outwardly, and having a ring leg formed at the joint part of the body part and the bottom part, and fitted to the outside of the body part of the paper cup body A paper heat insulating cup composed of a paper cylinder, and the surface of the paper cylinder is formed flat, and the lower part is formed with a bent part that bends inward by pressure and / or heat and pressure. The lower end of the cylindrical body that is fitted into the body portion of the paper cup body and formed with the bent portion is fixed to the outer surface of the annular leg portion at the lower edge of the paper cup body body portion, and the upper end of the cylindrical body is the mouth of the body portion. A heat insulating cup made of paper, which is fixed in contact with the lower edge of the edge, and is provided with a heat insulating space layer over the entire circumference of the paper cup main body between the paper cup main body and the paper cylinder.   A curved part that bends inward by pressurization and / or heating and pressurization is formed on the upper part of the paper cylinder, and the upper end of the curved part is fixed to the outer surface of the trunk part at the lower end of the mouth part of the trunk part. The paper heat insulating cup according to claim 1.   A curved edge portion curled inwardly is formed on an upper peripheral edge of the paper tube body, and an inner surface of the curved edge portion is fixed to an outer surface of a body portion at a lower end of a mouth edge portion of the body portion. Item 2. A paper heat-insulating cup according to item 1.   An adhesive in which the curved edge portion is pressed and flattened in the vertical direction to form a flat curved edge portion, and the inside of the flat curved edge portion and the outside of the trunk portion of the paper cup body are applied to the outside of the paper cup body barrel portion. The paper heat insulating cup according to claim 3, wherein the paper heat insulating cup is adhered via a heat sink.   2. The paper heat insulating cup according to claim 1, wherein an annular ridge projecting outward is formed above the body portion.   2. The paper heat insulating cup according to claim 1, wherein an annular step portion extending outward is formed above the body portion.

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