JP2016000623A - Outer sleeve for thermal insulation and thermo-insulating paper container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide: an outer sleeve for thermal insulation with embossment that is easy to wind around a paper container; and a thermo-insulating paper container with the outer sleeve for thermal insulation.SOLUTION: A paper outer sleeve is configured to be wound along an outer periphery of a trunk of a paper container with a circular truncated cone shape. An outer sleeve for thermal insulation is provided with embossment made up of a large number of convexoconcaves that are continuous vertically and laterally. The outer sleeve for thermal insulation satisfies the conditions that a maximum rigidity (S1) in a winding direction of the embossment to be formed on the outer sleeve for thermal insulation is 14.5 mN m or less, and S1/S2 that is a ratio of the maximum rigidity and a minimum rigidity (S2) is 1≤S1/S2≤1.89.

Description

  The present invention relates to a heat insulating outer sleeve formed with an emboss and a heat insulating paper container provided with the heat insulating outer sleeve.

2. Description of the Related Art Conventionally, a heat insulating container is known in which an embossed outer sleeve is wound around the outer surface of a side wall portion of a paper container main body in order to impart heat insulation to a cup-shaped paper container.
For example, in the heat insulating paper cup of utility model registration No. 2583258 and utility model registration No. 2603108, the point of the diameter of 2 to 5 mm at the same depth of 1 to 2 mm in height difference on the outer periphery of the frustoconical paper cup side wall. Jo embossed pattern of the convex portions or concave portions or convex portions and three of the embossed pattern which arranged alternately concave / cm 2 ^{to 10} pieces / cm made of paper that has been subjected in the ^second density insulation sheet, is wound, A configuration is disclosed in which the density of the dot-like embossed pattern of the heat insulating sheet exhibits a substantially continuous appearance with substantially the same density including the winding end.
However, since the blank of the outer sleeve has a fan shape, the number of embossments in the direction of winding the blank in a cylindrical shape differs depending on the upper and lower sides of the outer sleeve when the convex and concave portions of the emboss are substantially the same shape. Since the rigidity is different between the upper and lower sides, the outer sleeve may not be wound around the paper cup.
As the cause, since the rigidity in the winding direction is different between the upper and lower sides of the blank, it has been found that if the difference is larger than a certain level, it is difficult to bend the upper and lower sides evenly in the winding direction and the winding cannot be performed.

In addition, in order to suppress blocking when stacking the heat insulating container, in order to suppress blocking, from the curl side to the bottom side of the upper end of the cup, the height difference of the emboss is gradually reduced, There are also known configurations that make the outer shape smaller, but in this case too, the embossed part is deeper (larger) and the rigidity in the lateral direction increases, and the difference in rigidity between the part with lower (smaller) embossing is different. Therefore, if the difference is larger than a certain level, it becomes difficult to bend the top and bottom evenly in the winding direction, and winding becomes impossible.
Further, the difference in the height of the embossment between the upper and lower sides of the outer sleeve means that the thickness is different in one outer sleeve and the diameter difference becomes large, so that it is difficult to wind.
On the other hand, the method of winding the outer sleeve can be devised, or the method of winding at a lower winding speed can be considered, but with the above method the structure of the winding device is complicated and the productivity is reduced. There is.
Therefore, as a result of earnest research, the present inventors have found that the rigidity of the winding direction of the outer sleeve is closely related to whether or not the embossed outer sleeve can be wound around the paper container main body, and the height is high. In the case of embossing that gradually decreases, it has been found that the ratio between the maximum height and the minimum height is also related, and the present invention has been completed.

Utility Model Registration No. 2583258 Utility Model Registration No. 2603108

The present invention has been devised to solve the above problems, and the main problem is that the maximum stiffness and the minimum stiffness in the winding direction of the emboss formed on the outer sleeve are limited to a certain range, thereby An object of the present invention is to provide an outer sleeve for heat insulation in which a sleeve can be easily wound around a paper container body and a heat insulating paper container using the same.
Another subject of this invention is
Even when adopting a configuration in which the height difference of the embossment of the outer sleeve is gradually lowered from the top to the bottom, the outer sleeve for heat insulation that can easily wind the outer sleeve around the paper container body and the heat insulating paper container using the same Is to provide.

In order to solve the above-mentioned problems, the present invention provides
A paper outer sleeve that is wound around the outer periphery of the body of the truncated cone-shaped paper container body, and is an outer sleeve for heat insulation that has been embossed with a number of concavities and convexities that are continuous vertically and horizontally.
The maximum stiffness (S1) in the winding direction of the emboss formed on the heat-insulating outer sleeve is 14.5 mN · m or less, and the ratio of the maximum stiffness to the minimum stiffness (S2) S1 / S2 is 1 ≦ S1 / S2. ≦ 1.89 is satisfied.
In the invention of claim 2,
The embossing formed on the heat insulating outer sleeve is characterized in that the height of the embossing is set gradually lower from the top to the bottom when the paper container body is mounted.
In the invention of claim 3,
H1 / H2, which is the ratio of the emboss height (H1) of the highest embossed portion formed on the outer sleeve to the emboss height (H2) of the lowest portion, is 1.00 or more and 3.78 or less It is characterized by satisfying.
In the invention of the heat insulating paper container of claim 4,
The outer sleeve for heat insulation according to claim 1 or 2 is wound around the outer periphery of the trunk portion of the paper container body having a truncated cone shape.

In the heat insulating paper container of the present invention, the maximum stiffness (S1) and the minimum stiffness (S2) of the embossing of the outer sleeve are not more than a certain value, and the ratio of the maximum stiffness (S1) and the minimum stiffness (S2) is not more than a certain value. In this case, the outer sleeve can be easily wound around the paper container body.
Further, when the ratio of the emboss height (H1) at the highest portion to the emboss height (H2) at the lowest portion is equal to or less than a certain value, the outer sleeve can be easily wound around the paper container body.

It is a fragmentary sectional view of a heat insulating paper container. (A) is a development view of the outer sleeve and is a diagram for explaining the change in the height of the emboss, and (b) is a position of the sample for measuring the maximum stiffness (S1) and a position of the sample for measuring the minimum stiffness (S2). FIG. It is a figure which shows the location which measures the maximum height position of the embossment of an outer sleeve, and the location which measures the minimum height position. It is an expanded view of the outer sleeve used for the measurement. 5A is an end view of the emboss of FIG. 4, and FIG. 4A is an end view of the upper portion aa in the vertical direction, FIG. 4B is an end view of the intermediate bb in the vertical direction, and FIG. (D) is a dd end view of the upper part in the horizontal direction, and (e) is an ee end view of the lower part in the horizontal direction. FIG. 6 is a development view of an outer sleeve of Example 2.

In the present invention, the emboss is formed so that the rigidity of the embossed unevenness is in a certain range, and the ratio of the maximum stiffness and the minimum stiffness of the upper and lower embosses is a constant condition. By forming the embossment so that the height ratio is constant, the outer sleeve is securely wound around the paper container body.
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
A heat insulating paper container 1 shown in FIG. 1 includes a known bottomed truncated cone-shaped paper container main body 2 and a heat insulating outer sleeve 5 that is wound around and secured to a body portion 3 of the paper container main body 2. ing.
The blank of the heat insulating outer sleeve 5 has a substantially fan shape, and a large number of embossed convex portions 6 are formed at equal intervals, and is wound around the paper cup body 1.

That is, the upper end portion 5 a of the heat insulating outer sleeve 5 is wound around the trunk portion of the paper cup main body 1 in a sleeve shape below the curled portion 2 a of the paper container main body 2 without a substantial gap.
The upper end of the heat insulating outer sleeve 5 may be wound around and fixed to the curled portion 2a without forming an emboss.

The embossing has a space portion 4 between the inside of the convex portion 6 and the outer wall of the body portion 3 of the paper cup body 1 to have a heat insulating function.
The heat insulating outer sleeve 5 may have a surface with characters, patterns, coloring, or the like appropriately printed thereon.

 In the outer sleeve 5 in which the embossed convex portion 6 is continuously formed, the body of the paper container main body 2 depends on the rigidity of the emboss in the winding direction around the paper container main body 2 and the height of the embossed convex portion 6. It may be impossible to wind along the outer peripheral surface of the portion 3, and certain conditions are required for the rigidity in the emboss winding direction and the height of the convex portions of the emboss.

[Measurement data 1]
The fan-shaped test base paper 5 ′ corresponding to the blank of the outer sleeve 5 was embossed so that the heights of the embossed convex portions 6 were gradually lowered (see FIG. 2A), and the embossing was performed. It was tested whether or not the test base paper 5 ′ can be wound around the body 3 of the paper container body 2.
Stiffness was measured at high places S1 and low places S2 (see FIG. 2 (b)) of the embossed convex portion 6, and the rigidity and the possibility of winding were measured under the following conditions.

As test base paper 5 ', base paper A was used as the most suitable for embossing, base papers B and C were used generally for embossing, and base paper D was used as the other.
Base paper A: Base paper manufactured by company a 200 g / m ² (basis weight, the same applies hereinafter)
Base paper B: Base paper manufactured by company b 200 g / m ²
Base paper C: Base paper manufactured by company b 300 g / m ²
Base paper D: Base paper made by company c 420 g / m ²

The test base paper 5 'of the base papers A to D is punched into a fan shape that can be wound around a paper cup or paper cup.
For embossing, the whole fan shape was embossed with an embossing device so that the embossing height was low in the flow direction of the base paper.
That is, in the case of FIG. 1, the embossing has a large number of convex portions 6 arranged at equal intervals on the same line in the radial direction (row direction), and the rows of convex portions in the row direction are arranged. It has a configuration in which a large number of rows are arranged at the same angle, and is formed in a staggered arrangement so that concave portions 7 are formed between four convex portions 6 adjacent in the vertical and horizontal directions.
In the embossing shown in FIG. 4, the convex portions 6 are arranged side by side so that the gaps (corresponding to the concave portions) separating the row direction and the column direction of the convex portions 7 are straight lines or curved lines having the same width. Is set to
In this invention, the combination of a convex part and a recessed part or a convex part is not limited to the said example of illustration, What is necessary is just to arrange | position with the fixed pattern for heat insulation.

For embossing, a method of passing a blank between an intaglio and a relief embossing roll, a method of pressing a plate-like relief and an intaglio from above and below the blank, and a method of pressurizing the relief and intaglio in a staggered arrangement from above and below the blank This method can be used.
The embosses formed on the outer sleeve of FIG. 4 have three vertical end faces (FIGS. 5A to 5C) in the upper part (aa), middle (bb), and lower part (cc) in the vertical direction. )) And two lateral end views (see FIGS. 5D to 5E) of the upper part (dd) and the lower part (ee) in the lateral direction (winding direction).

The embossed shape in FIG. 1 is the same shape as, for example, Design Registration No. 1174242, and the cross section in this case also conforms to the end view of FIG.
The planar shape of the embossed convex portion 6 of the present invention may be an appropriate shape such as a round dot shape, a square dot shape, or a hexagonal dot shape.
As an example of embossing, convex portions and concave portions (between convex portions and convex portions) are alternately arranged at a density of 3 pieces / cm ² to 10 pieces / cm ² , and the diameter of the convex portions is 2 mm to 5 mm. Of course, the present invention is not limited to the above numerical values.

Each of the test base papers A to D was adjusted to three types of embossing amounts (heights of the convex portions) within a range used in a practical product.
(Unit: mm)
Base paper A1 Emboss top height 0.87 Minimum height 0.57
A2 Emboss top height 0.87 Minimum height 0.46
A3 Emboss top height 0.87 Minimum height 0.23
Base paper B1 Emboss top height 0.96 Minimum height 0.64
B2 Emboss top height 0.87 Minimum height 0.57
B3 Emboss top height 0.87 Minimum height 0.24
Base paper C1 Emboss top height 1.10 Minimum height 0.75
C2 Emboss top height 1.10 Minimum height 0.67
C3 Emboss top height 1.10 Minimum height 0.34
Base paper D1 Emboss top height 1.47 Minimum height 1.27
D2 Emboss top height 1.47 Minimum height 1.14
D3 Emboss top height 1.10 Minimum height 0.59

Rigidity measurement was performed on each of the three types of test base papers, with test pieces S1 and S2 having a horizontal width of 70 mm and a flow (vertical width) of 38.1 mm square at a high embossed height (upper part) and a lower embossed position (lower part). The stiffness was measured (see FIG. 1B).
The stiffness was measured based on JIS P-8125.
In the winding evaluation, the outer sleeve 5 is wound around the body 3 of the frustoconical paper container body 2 by using a winding device, and it is determined that the one without winding deviation or bending can be wound, and the winding deviation or bending is not caused. The result was determined as no.

The measurement results of stiffness are shown in Table 1.

From the above, when the maximum stiffness was 14.5 mN · m or less, it was possible to wind all.
Winding was not possible in Test 12 with a stiffness ratio (S1 / S2) value of 2.78, but when the stiffness ratio (S1 / S2) value was 1.89, winding was possible.
As a result, it was found that winding can be easily performed by combining the base paper and embossing so that the maximum stiffness is 14.5 mN · m or less and the stiffness ratio is 1 or more and 1.89 or less. did.

[Measurement data 2]
Next, since the rigidity of the emboss increases as the emboss increases, the relationship between the height of the emboss and the possibility of winding is measured.
That is, an acrylic plate having a width of 20 mm, a width of 20 mm, and a thickness of 3 mm is laid on the test base papers A1 to D3 used in the measurement data 1 at the highest height position H1 and the minimum height position H2 of the emboss height. Each height was measured (see FIG. 2).

The measurement results of the emboss height are as shown in Table 2.

  Thus, if the ratio of the maximum height to the minimum height (HI / H2) of the emboss is 3.78 or less, winding is possible, and if it exceeds 3.78, the blank is twisted and the sleeve cannot be wound. found.

The heat insulating paper container 1 shown in Example 2 is embossed so that the height of the embossed convex portion 6 ′ is substantially the same as the fan-shaped test base paper 5 ″ corresponding to the blank of the outer sleeve 5 (see FIG. 6), whether or not the embossed test base paper 5 ″ can be wound around the body of the paper container main body (same as Example 1 and not shown). Reference numeral 7 'denotes a recess.
The test base paper 5 ″ used base papers A to D in the same manner as in Example 1, and the height of the emboss was the same as the top height in A1 to A3, B1 to B3, C1 to C3, and D1 to D3 of Example 1. .
The measurement result of the stiffness in this case is that the maximum stiffness (S1) is the same as the value in Table 1, and the minimum stiffness (S2) is not less than the value in Table 1, but the ratio between the maximum stiffness and the minimum stiffness (S1 When / S2) was 1 or more and exceeded 1.89, it was confirmed that winding was not possible.
As a result, also in Example 2, it is possible to easily wrap by combining the base paper and embossing so that the maximum stiffness is 14.5 mN · m or less and the stiffness ratio is 1 or more and 1.89 or less. It was confirmed that.

  The embossing formed on the outer sleeve of the present invention is not limited to the range of the above embodiment, and can be wound around the paper container main body as long as the ratio of the rigidity and height is within the range.

DESCRIPTION OF SYMBOLS 1 Thermal insulation paper container 2 Paper container main body 2a Curl part 3 Trunk part 4 Space part 5 Outer sleeve for heat insulation 5 'Blank 6 Convex part 7 Concave part

Claims (4)

A paper outer sleeve that is wound around the outer periphery of the body of the truncated cone-shaped paper container body, and is an outer sleeve for heat insulation that has been embossed with a number of concavities and convexities that are continuous vertically and horizontally.
The maximum stiffness (S1) in the winding direction of the emboss formed on the heat-insulating outer sleeve is 14.5 mN · m or less, and the ratio of the maximum stiffness to the minimum stiffness (S2) S1 / S2 is 1 ≦ S1 / S2. An outer sleeve for heat insulation characterized by satisfying a condition of ≦ 1.89.   2. The heat insulating outer sleeve according to claim 1, wherein the embossing formed on the heat insulating outer sleeve is set such that the height of the embossing gradually decreases from the top to the bottom when the paper container body is mounted.   H1 / H2, which is the ratio of the emboss height (H1) of the highest embossed portion formed on the outer sleeve to the emboss height (H2) of the lowest portion, is 1.00 or more and 3.78 or less The outer sleeve for heat insulation according to claim 1, wherein:   A heat-insulating paper container, wherein the heat-insulating outer sleeve according to claim 1 or 2 is wound around an outer periphery of a body portion of a frustoconical paper container body.

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