JPH06312753A - Pouch having self-sealing discharge passage - Google Patents

Abstract

PURPOSE:To obtain a pouch provided with a self-sealing discharge passage, capable of pouring out its content by pressure application and displaying sealing function when pressure is released by appropriately setting the shape, beam factor and beam area ratio of the discharge passage part (spout) and the stabilizing force of a sealing part. CONSTITUTION:A pouch 1 is formed by making plastic film into the shape of a bag and the seal face 2 of one side of the pouch is partially left unsealed to form a discharge passage 3. The factor for indicating if the self-sealing force to make the discharge part flat acts in X axis direction and Y axis direction, i.e., beam factor, is made Cx>=1 in the X axis direction and Cy>=2 in the Y axis direction, the area ratio of an unsealed part (discharge part) to a sealed part at the discharge part, i.e., beam area ratio (X.Y-unsealed part)/ X.Y, is made 0.35-0.8 and the stabilizing force, which is an actual indication of the beam action taking place, including all the changes caused by the kinds of the pouch forming materials (groped by rigidity, elasticity, flexibility, etc.), wall thickness and temperature, is made 5-15cm, thereby, a simple pouch having both dischargeability and self-sealability is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pouch having a content pouring path (hereinafter sometimes referred to as a spout part) having a self-sealing function, and having a self-sealing property even when the spout part is opened. The present invention also relates to a pouch having a spout portion that can be poured out and having a function of replacing a container with a pump, a squeeze bottle, or the like.

[0002]

2. Description of the Related Art Liquid containers for liquid detergents, shampoos, rinses and the like, which are closed when not in use so that an appropriate amount of liquid can be easily poured out when in use, molded containers with pumps of various shapes and structures, and squeeze bottles. Is commonly used. However, in addition to the drawbacks such as the need for expensive mold equipment due to the complicated structure compared to ordinary disposable pouches, these also make the container bulky, so recently plastics due to dumping of used containers have been created. It also causes pollution.

Therefore, in order to improve these drawbacks, there has been considered a product form in which a spout with a spout made of a plastic film is attached with a spout member and a pump member separately prepared for use. That is, a normal pouch with a spout cannot be sealed again after once opening the sealed spout part and using it as a pouring mouth, and is not suitable for continuous use as a container, but is poured into the spout part of the pouch. This is because if the outlet member and the pump member are attached, the pouch can be continuously used as a storage container until the contents are used up. However, since the work of mounting the spout member and the like on the pouch is unexpectedly troublesome, such a packaging form has not been widely used.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and its purpose is to give a self-sealing function to a spout part of a pouch with a spout even after opening and use the pouch. Attempts to provide a pouch with a self-sealing spout that can be poured out by applying pressure with hands or the like at times, and can exert a self-sealing function when the pressure is released. .

[0005]

The structure of the present invention which has been able to solve the above-mentioned problems is a pouch in which a content pouring path is formed on the sealing surface of a sealed pouch made of a plastic film. When the width direction is the Y-axis and the width direction of the sealing surface is the X-axis, the content pouring path is displaced in the Y-axis direction including displacement in the X-axis direction to reach from the content side opening to the outlet opening. In this case, the displacement in the X-axis direction can be displaced in all vectors, but the displacement in the Y-axis direction does not include the displacement of the vector, or the pouring path has a bending or bending angle of 90 degrees or more. A straight line of X = a (a is a constant) that has two or more bends or bends, and that crosses the content discharge path, intersects the discharge path non-formation portion of the seal surface, and in the text. Spout defined Beam coefficients, stiffness strength of the beam area ratio and the seal portion and has a gist where satisfies the following requirements. Beam coefficient in the X-axis direction (Cx) ≧ 1 Beam coefficient in the Y-axis direction (Cy) ≧ 2 Beam area ratio = 0.35-0.8 Waist strength = 5-15 cm

[0006]

The pouch with a spout according to the present invention is a spout formed by forming a plastic film into a bag shape by sealing a two-way seal, a three-way seal or a four-way seal, and leaving a part of the sealing surface on one side in an unsealed state. A part is formed, and the seal part at the tip of the spout part is opened so that it can be opened. Such a pouch with spout itself is known and is widely used as a simple packaging container for liquid agents such as liquid detergent, shampoo, and rinse.

However, the spout portion of these known pouches is provided only for pouring,
Once opened, the spout remains open and it has never been considered that the spout has a self-sealing function. When the pouch falls down, the contents immediately flow out from the spout.

The present inventors have paid attention to such a situation, and if the spout portion after opening can be provided with a self-sealing function, the contents can be prevented from being washed out, and the pouch can be used as it is as a storage container. Considering that it can be used, we have been conducting research from various directions to give the spout a self-sealing property. As a result, the inventors have found that the purpose can be achieved by properly setting the shape of the spout portion, the beam coefficient, the beam area ratio, and the stiffness of the seal portion as described above, and have completed the present invention.

First, the definitions of the beam coefficient, beam area ratio and waist strength in the present invention will be clarified. (1) The beam coefficient of the spout means the force (self-disintegrating) that disassembles the spout part of the pouch in the vertical (Y-axis) direction and the horizontal (X-axis) direction to flatten the fluid passage part (non-sealing part) of the spout. (Sealing force) is a coefficient indicating how much the sealing force acts in the X-axis and Y-axis directions, and details thereof will be described with reference to FIG.

In FIG. 1A, 1 is a pouch, 2 is a seal portion, 3 is a spout, and the beam coefficient is only the spout forming portion as shown in FIG. 1B, and the liquid passage portion of the spout ( The beam in the X-axis direction and the beam in the Y-axis direction that try to close the non-sealed portion) are obtained as follows.

Beam in the X-axis direction: Looking at the force for closing the spout portion flatly in the X-axis direction, what acts as a beam is X ₁ + X _{2 in} FIG. 1 (C). Beam in the Y-axis direction: When the force to close the spout part flatly is viewed in the Y-axis direction, it acts as a beam in FIG. 1 (D).
It becomes Y ₁ + Y ₂ + Y ₃ + Y ₄ . Beam coefficients Cx, Cy: A value obtained by dividing the total of the beams in the X-axis direction and the Y-axis direction in the spout portion by the width of each axis is obtained as beam coefficients Cx, Cy. _{^{Cx = Σ n i = 1 Xi}} / X Cy = Σ n i = 1 Y 1 / Y beam area ratio: As shown in FIG. 2, the non-sealing portion of the spout portion (the passage) the area ratio of the seal portion following Calculate by formula. Beam area ratio = (X-Y-non-sealed part) / X-Y

(2) The waist strength of the seal part: The beam action by the seal part changes depending on the type of pouch constituent material (rigidity, elasticity, flexibility, etc.), wall thickness, temperature, etc. As an index that can actually show the action, the waist strength obtained by the following method is evaluated. That is, the seal part of the pouch is cut into a width of 1 cm and a length of 15 cm or more, and the cut piece 5 is placed on a horizontal table 4 on the upper surface as shown in FIG.
The tip 5a of the cut-out piece 5 is measured to measure the length of protrusion when the tip 5a hangs down from the upper surface of the base 4 by 1 cm. Turn over the cut piece and repeat this operation to obtain the average value of the protruding length and make it the waist strength.

Further, in the above-mentioned configuration, "the displacement in the X-axis direction can be displaced in all vectors, but the displacement in the Y-axis direction does not include the displacement of the vector" means, for example, FIG.
As shown in (A), the sealing surface 2a is narrowed (X-axis direction).
Although the center line 3a of the spout 3 is inclined with respect to b, or the direction vector of the center line 3a of the spout 3 with respect to the seal surface 2a can be displaced in any direction, as shown in FIG. 4B. Each of the angles x, y, and z is 0 or more, which means that the Y-axis direction vector becomes negative as shown in FIG. 4C and the spout pointing direction must not return to the content filling portion direction. .

However, for example, as shown in FIG. 4 (D), when the pouring path 3 has two or more bending portions (or bending portions), the bending (or bending) angles are all 90 degrees or more. Are within the scope of the invention.

Furthermore, "X = a (a
Is a constant line) that crosses the pouring path non-formation portion of the seal surface. ", For example, as shown in FIG. 5 (A), on the line connecting the content side opening 3p of the spout 3 and the outlet opening 3q with a straight line. This means that the seal portion 2 is present and the flow passage does not penetrate straight, and on the line connecting the content side opening 3p and the outlet opening 3q with a straight line as shown by the shaded area 3z in FIG. 5 (B). The purpose is to exclude the case where the seal portion 2 does not exist.

In the above description of definition, the term "straight line" includes a line that can be approximated to a straight line by the method of least squares, and the bent portion includes a curved portion. Each constituent element of the present invention defined under the above definition will be described in detail.

In the pouch of the present invention, when the pressure is applied to the pouch with the spout portion opened as described above, the liquid inside is poured out from the spout, and when the pressure is removed, the self-sealing function is exerted and the liquid is poured out. In order to achieve such an object, first, the beam coefficient (Cx) in the X-axis direction of the spout portion is set to 1 or more and the beam coefficient (Cx) in the Y-axis direction is set.
y) must be 2 or more, and the beam area ratio must be 0.35 to 0.8.

Since the spout is formed through the seal portion 2 as is clear from the description of FIG. 1, the beam coefficient (Cy) in the Y-axis direction is less than 2. Absent. On the other hand, the beam coefficient (Cx) in the X-axis direction changes considerably depending on the length of the spout, the flow passage width, the number of bends, etc.
As the value of (Cx) becomes smaller, pouring becomes easier, but the self-sealing property deteriorates. From such a viewpoint, as a result of examining self-sealing property for various (Cx) values, in order to secure sufficient self-sealing property intended by the present invention, (C
It was confirmed that x) must be 1 or more.

The beam area ratio represents the area ratio of the beam portion (sealing portion) to the total area of the spout forming portion as described above, and the ratio is the ease of pouring the liquid and the self-sealing property. As the ratio decreases, the spout flattening force due to the beam action of the seal decreases and the ease of pouring increases, and conversely as the ratio increases, the beam of the seal increases. The action is increased and the self-sealing property is improved. Therefore, when a suitable area ratio capable of imparting a sufficient self-sealing function while ensuring an appropriate easiness of pouring was examined by various experiments, the beam area ratio was 0.35
It was found that it should be 0.80, and more preferably 0.4 to 0.7. By the way, the area ratio is 0.3
When it is less than 5, the self-sealing property becomes insufficient and the liquid easily flows out from the spout, while when it exceeds 0.80, it depends on the viscosity of the liquid charged inside the pouch.
Excessive pressure when pouring liquid from the pouch.

Further, the flattening force of the spout portion due to the beam action of the seal portion is related to not only the shape characteristics of the spout forming portion but also the waist strength of the seal portion. However, not only does the pouch itself become rigid and the handleability deteriorates, but it also becomes difficult to pour out the liquid. From this point of view, in the present invention, the waist strength of the seal portion is 5 to 15 as a requirement for obtaining sufficient self-sealing property while ensuring excellent handleability and pourability as a pouch.
cm, more preferably 7 to 15 cm.

Further, the spout portion includes a straight portion or a bent portion (including a curved portion) having one or more bent portions as described above, but the sealing surface is on the straight line of X = a which crosses the spout. If there is no flow path portion that directly penetrates in the Y-axis direction of the seal surface, the self-sealing property becomes insufficient, and liquid leakage is likely to occur, and the spout is as shown in FIG. 4 (C). , If there is a bent portion (or curved portion) having a vector displacement in the Y-axis direction,
Since the flow path resistance of the bent portion becomes large, it becomes difficult to pour. Therefore, in order to achieve the object of the present invention, in addition to the beam coefficient, the beam area ratio, and the waist strength of the seal portion described above, the displacement in the Y-axis direction does not include the displacement of the vector, and X = that traverses the spout It is indispensable that the straight line a (a is a constant) crosses the portion where the spout passage is not formed on the seal surface.

However, for example, as shown in FIG. 4 (D), when the pouring path 3 has two or more bends (or bends), the bend (or bend) angles a and b are both 90 degrees or more. In the case of, the flow resistance of the pouring path 3 does not increase so much, so that the object of the present invention can be achieved.

Further, the easiness of pouring from the opened spout portion considerably varies depending on the fluidity, viscosity, surface tension, etc. of the liquid charged in the pouch, and accordingly, it is determined as described above. The best combination should be selected appropriately from the range of constituent requirements.

The constituent material of the pouch according to the present invention is not limited at all, and polyolefin films such as polyethylene and polypropylene, polyester films, nylon films or various mixed films including them, and further coextrusion films. It is possible to use all the composite films such as a laminated film and the like, and they may be unstretched films, or of course uniaxially or biaxially stretched films. The preferable thickness of these films is naturally determined by the stiffness of the seal portion defined in the present invention, but the most common thickness is 40 to 400 μm, and the more general thickness is 60 to 20 μm.
The thickness is 0 μm.

There is no particular restriction on the sealing means, and it is of course possible to adopt an adhesive sealing method using a hot melt adhesive or the like in addition to the most general heat sealing, not to mention the material of the sealant layer. The presence or type of overcoating agent is not limited at all.

[0026]

The present invention will be described in more detail with reference to the following examples. However, the present invention is not limited to the following examples, and can be appropriately modified within the range that can meet the gist of the preceding and following description. Of course, it is also possible to add
All of them are included in the technical scope of the present invention.

Example 1 Uniaxially stretched nylon (15 μm) and polyethylene (80 μm)
12 cm x using a laminated composite film composed of
A standing pouch of 20 cm is formed, and a spout portion having a shape shown in FIGS. 6 (A) to (D) is provided in the upper seal portion, 200 ml of water is sealed therein, and the tip of the spout portion is cut off and opened. The pourability and self-sealing properties were investigated. However, the waist strength of the seal part of this pouch is 8 cm
Further, the evaluation methods of the pourability and the self-sealing property are as follows.

(Pourability Evaluation Method) After cutting off the tip of the spout and opening the bag, the lower part of the pouch is squeezed and the internal pressure is increased to evaluate the condition of the content according to the following criteria. ◎: The contents come out only by lightly pressing the pouch. ◯: The contents come out when the pouch is strongly gripped (the contents come out when a pressure of 1 to 1.5 kg is applied to the lower part of the pouch). Δ: The content comes out when the pouch is gripped more strongly (pressure of 1.5 kg or more). X: The contents do not come out even if the pouch is gripped and squeezed.

(Self-sealing evaluation method) The spout part is squeezed with a finger to squeeze out the liquid in the spout part, and after sealing the spout part, the content (liquid) of the contents (liquid) when the pouch is laid sideways or hung upside down. The output is evaluated according to the following criteria. ◎: Liquid leakage does not occur even if it is hung upside down and vibrated. ○: If it is upside down and left stationary, no liquid leakage will occur. Δ: Liquid leakage does not occur if it is laid sideways. ×: Liquid leakage occurs just by lying down. The results are collectively shown in Table 1 together with the beam coefficient of each spout.

[0030]

[Table 1]

As is clear from Table 1, No. 1A is a spout formed orthogonal to the width direction of the sealing surface, and the beam coefficient (Cx) and beam area ratio in the X-axis direction meet the specified requirements. Since it is dislocated, it shows almost no self-sealing property, and No. 1B has a spout formed obliquely crossing the seal side, but both the beam coefficient (Cx) and the beam area ratio are low,
Moreover, the self-sealing property is poor because there is a flow passage portion that penetrates straight through the spout portion. For these, No. 1C, 1D
Is an example that satisfies the prescribed requirements of the present invention, and excellent self-sealing property is obtained while maintaining an appropriate pouring property.

Example 2 An experiment was conducted in the same manner as in Example 1 except that the spout shape was S-shaped as shown in FIGS. 7 (A) to 7 (D), and the pouring property and self-sealing property were compared. did. The results are shown in Table 2 together with the respective beam coefficients and beam area ratios, and all the examples (No. 2B, 2C) satisfying the requirements of the present invention have excellent pouring property and self-sealing property. In contrast, in the comparative examples (No. 2A, 2D) lacking any of the specified requirements, satisfactory self-sealing property is not obtained.

[0033]

[Table 2]

Example 3 An experiment was conducted in the same manner as in Example 1 except that the spout shape was changed to a letter shape as shown in FIGS. 8 (A) to 8 (C), and the pouring property and the self-sealing property were examined. The results are shown in Table 3,
The examples (No. 3B, 3C) satisfying the specified requirements of the present invention have excellent pouring property and self-sealing property, but the self of the comparative example (No. 3A) not satisfying the specified requirements The airtightness is poor.

[0035]

[Table 3]

Example 4 An experiment was conducted in the same manner as described above except that the spout shape was O-shaped as shown in FIG. 9, and as shown in Table 4, excellent spoutability and self-sealing property were obtained. I was able to.

[0037]

[Table 4]

Example 5 The spout shape was the same as that shown in FIG. 6 (C),
An experiment was conducted in the same manner as described above except that the film constitution and the waist strength were changed as shown in Table 5, and the pouring property and the self-sealing property were examined. The results are collectively shown in Table 5, and all the examples satisfying the specified requirements of the present invention have excellent pouring property and self-sealing property, whereas the comparative examples lacking the specified requirements , Either self-sealing property or pourability is insufficient.

[0039]

[Table 5]

[0040]

The present invention is constructed as described above, and it is possible to provide a very simple and inexpensive pouch having an extremely simple shape and structure and having both pouring property and self-sealing property.

[Brief description of drawings]

FIG. 1 is a diagram for explaining a method of calculating a beam coefficient.

FIG. 2 is a diagram for explaining a method of calculating a beam area ratio.

FIG. 3 is an explanatory diagram showing a method for measuring waist strength.

FIG. 4 is an explanatory view illustrating the formation direction of spouts.

FIG. 5 is an explanatory view showing a molding example of a spout.

FIG. 6 is a diagram showing a shape of a spout adopted in the embodiment.

FIG. 7 is a diagram showing the shape of the spout adopted in the embodiment.

FIG. 8 is a diagram showing a shape of a spout adopted in an example.

FIG. 9 is a diagram showing the shape of the spout adopted in the embodiment.

[Explanation of symbols] 1 pouch 2 sealing surface 3 spout passage part 4 units 5 cut piece 5a cut piece tip

Claims (2)

[Claims] 1. A pouch having a sealing surface of a sealed plastic film pouch in which a content pouring path is formed, where the narrow width direction of the sealing surface is the Y axis and the wide width direction of the sealing surface is the X axis. It is assumed that the content pouring path is displaced in the Y axis direction including the displacement in the X axis direction to reach from the content side opening to the outlet opening, and in this case, the displacement in the X axis direction can be displaced in all vectors. However, the displacement in the Y-axis direction does not include the displacement of the vector, and the straight line of X = a (a is a constant) that traverses the contents discharge passage is a line that crosses the discharge passage non-formation portion of the seal surface. A pouch having a self-sealing pouring path, characterized in that the beam coefficient of the pouring path, the beam area ratio, and the waist strength of the sealing portion defined in the text satisfy the following requirements. Beam coefficient in the X-axis direction (Cx) ≧ 1 Beam coefficient in the Y-axis direction (Cy) ≧ 2 Beam area ratio = 0.35-0.8 Waist strength = 5-15 cm 2. A pouch having a sealing surface of a sealed plastic film pouch in which a content pouring path is formed, wherein the narrow width direction of the sealing surface is the Y axis and the wide width direction of the sealing surface is the X axis. It is assumed that the contents pouring path is displaced in the Y axis direction including the displacement in the X axis direction to reach from the contents side opening to the exit opening, and in this case, the pouring path has a bending or bending angle of 90 degrees or more. The straight line of X = a (a is a constant), which has two or more bends or bends, and which crosses the contents discharge passage, intersects the discharge passage non-formation portion of the seal surface, and A pouch having a self-sealing spout, characterized in that the beam coefficient of the spout, the beam area ratio, and the waist strength of the seal part defined in 1. meet the following requirements. Beam coefficient in the X-axis direction (Cx) ≧ 1 Beam coefficient in the Y-axis direction (Cy) ≧ 2 Beam area ratio = 0.35-0.8 Waist strength = 5-15 cm