JPH0741016A - Pouch with improved discharging efficiency - Google Patents

Abstract

PURPOSE:To prevent the part where a spout is formed from buckling and wrinkling in pressing a pouch body with a hand and prevent unsatisfactory discharging of contents, by providing a constriction point in the vicinity of the root of a passage along which the contents are extracted, thereby easily opening the extraction passage. CONSTITUTION:A pouch 1 in a normal state filled with a solvent has a size and a shape which meet an amount of solvent 2 to be filled, and has a content volume so that the width of a filling space becomes greater toward lower end and smaller toward a top sealed-face 4 in which a spout 3 is made. A constriction point 14 is provided in the vicinity of the root of the spout 3; when force is exerted to the pouch 1, force in the Z-axis direction acts between the constriction point 14 and the root of the spout 3, so that an opening in the root of the spout 3 is widened. At the same time, the contents flows from the opening, fills the spout 3, and erects the spout 3 by its force, and buckling of the spout 3 is also prevented. Because the root of the spout is prevented from wrinkling and buckling, the contents are smoothly discharged at all times.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pouch made of a plastic film, and in particular, prevents wrinkles and buckling of a content pouring path (hereinafter sometimes referred to as a spout portion) during use, and the content from the spout portion. It is related to a pouch that has been devised so that it can be poured out smoothly.

[0002]

2. Description of the Related Art A plastic film pouch having a spout portion on one of its sealing surfaces has been widely used as a lightweight, inexpensive and convenient simple container used for packaging liquid agents such as liquid detergents, shampoos and rinses. . (Fig. 1)

This pouch with a spout is formed by forming a flexible plastic film into a bag shape and forming a spout portion on one side of the seal portion. If the seal portion at the tip of the spout portion is cut off and opened, the pouch of the pouch is opened. The liquid in the spout can be poured out by applying a grip force to the body with a hand, and it can be discarded after the content is used up.
It is widely used as a simple packaging container for packaging various liquid medicines.

The present inventors have also defined the shape, structure, elasticity, etc. of the spout portion so that the contents are poured out when the pressure is applied and the contents are stopped when the pressure is released. By developing a pouch with a spout provided with the above, a technology has been developed that enables the pouch to be effectively used as a storage container, and a patent has been separately filed.

However, this pouch with a spout is flexible and easy to handle, but when the pouch body is pressed by hand, the sealing surface provided with the spout and the spout root are bent and buckled or wrinkled. It may be difficult to pour out the contents.

To solve these problems, for example, in Japanese Patent Laid-Open No. 3-505322, a constriction is formed in the upper part of the pouch on the side where the spout is formed, and the contents pass through a small room above the constriction and the spout. Although a method of suppressing buckling and wrinkles as described above is also provided by making it pouring from the part, this method can also completely eliminate the problem of poor pouring due to buckling. Absent. (Fig. 5)

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and its object is to buckle or wrinkle the spout forming portion when the pouch body is pressed by hand. The present invention aims to provide a pouch that prevents the above-mentioned problems and eliminates poor pouring of the contents.

[0008]

The structure of a plastic film pouch according to the present invention, which has been able to solve the above-mentioned problems, is a pouch in which a spout portion is formed on a sealing surface of a plastic film pouch. As a structure for preventing buckling and wrinkles around the base portion, it has the gist of forming a constriction point. The constriction points are formed by joining the seal surfaces inside the pouch, joining the seal surfaces inside the pouch with another material, and using a structure that forms a constriction point by applying force from the outside of the pouch. Shown as an example.

[0009]

ACTION AND EXAMPLES Under the above-mentioned problems to be solved, the present inventors first sought the cause of wrinkles or buckling of the spout forming portion during pouring. As a result, the following was considered. That is, FIG. 2 shows the pouch 1 in a normal state in which the liquid agent is charged. The pouch 1 is formed in a size and shape corresponding to the amount of the liquid agent 2 charged, and the inner volume thereof is normally downward. As it goes, the shape becomes wider (that is, z ₁ <z ₂ <z
₃ ) By narrowing the filling gap width toward the top seal surface 4 side where the spout 3 is formed, the top seal surface 4 is kept flat, and the spout 3 can be smoothly dispensed without being deformed. I am doing it.

However, when the lower portion of the pouch 1 is grasped by hand and liquid pressure is applied toward the top during pouring, the upper side of the pouch 1 swells in the z-axis direction as shown by the broken line in FIG. 3, for example.
Along with that, the length in the y-axis direction, that is, the length in the width direction of the pouch 1 is shortened, but the length of the top seal surface 4 does not change, so that the seal surface 4 is shown in FIGS. 4 (A) and 4 (B). As shown, it deforms in the z-axis direction to cause bending or buckling, which narrows the outflow path of the spout portion 3 and impedes the pouring property.

In order to reduce such problems, Japanese Patent Laid-Open No. 3-505322 discloses a pouch 1 as shown in FIG.
By forming a constricted portion 5 on the spout 3 formation side of the spout 3 and providing a small chamber 1a above the constricted portion 5 and pouring out from the spout 3 through this portion, a sealing surface on which the spout 3 is formed. A technique for suppressing the deformation of No. 4 has been proposed. However, even with this method, the deformation of the sealing surface 4 due to the expansion of the small chamber 1a cannot be surely eliminated, and this deformation causes wrinkles at the root of the spout and buckling of the spout. (Fig. 1)

Therefore, as a result of various studies to solve the problem of poor pouring due to the deformation of the sealing surface 4, a force acting in the z-axis direction is applied to the spout base to widen the mouth of the spout base. I found that if this is done, wrinkles and buckling can be prevented and stable pouring performance can be secured. That is, in the present invention, the structure for preventing wrinkles and buckling means that a constriction point is provided around the spout root, and when a force is applied to the pouch, a force in the z-axis direction is applied between the constriction point and the spout root. Works to open the mouth of the spout root, and at the same time, the contents enter from the mouth to fill the spout, and the force of the spout makes the spout upright and prevents buckling of the spout. Figure-6

The position of the constriction point may be anywhere where a force in the z-axis direction acts on the root portion of the spout when a force is applied to the spout, but as in JP-A-3-505322, formation of the spout portion of the pouch. When forming the constricted portion in the upper side portion (FIG. 5), it is necessary to set the constricted point of the present invention further above the constricted portion.

As a concrete example, the following structure is exemplified. A structure in which the seal faces of the pouch are joined together to form a constriction point. A joint point is formed around the base of the spout to join the seal faces together. The method of joining may be either heat sealing or joining with an adhesive. An example of providing a constriction point is shown in FIGS. However, the position and shape of the constriction point are not limited to this example.

Sealing surfaces of the pouch are joined together by using another material to form a constriction point. The sealing surfaces are joined together using another material at the place where the constriction point is set on the inner surface of the pouch. The different material may be the same material as the pouch or a different material. The material and shape are not limited. With this structure, the arrangement between the constriction point and the spout root can be freely adjusted, and even if the hand of the joining material is lengthened as shown in B of FIG. The filling amount can be increased as compared with A.

Structure where a force is applied from the outside of the pouch to form a constriction point A jig is set outside the pouch as shown in FIG. When force is applied to the lower part of the pouch, the upper part of the pouch bulges, but the neck of the spout is held down by a jig outside the pouch, and the mouth of the spout root is widened.

[0017]

EFFECTS OF THE INVENTION The present invention is configured as described above, and by setting a constriction point around the spout root, wrinkles and buckling of the spout root are prevented, and the pouring of the contents is prevented. I've always been able to do it smoothly.

[Brief description of drawings]

FIG. 1 is an explanatory diagram for explaining a pouch with a spout and a cause of a pouring failure during use.

FIG. 2 is an explanatory plan view showing how the spout forming seal surface is deformed during use.

FIG. 3 is an essential part explanatory view showing a state of deformation of the spout forming seal surface during use.

FIG. 4 is a sketch of a main part illustrating a known pouch having a structure for suppressing deformation of a spout forming seal surface.

FIG. 5 is an explanatory view of buckling and wrinkling of a seal portion including a spout portion.

FIG. 6 is a diagram illustrating how the force is applied in the z-axis direction when a constriction point is set around the root of the spout.

FIG. 7 is an explanatory diagram of a reference example in which a seal point inside a pouch is joined to set a constriction point.

FIG. 8 is an explanatory view in which the inside of the pouch is joined by using another material.

FIG. 9 is an explanatory diagram in which force is applied from the outside of the pouch to set the constriction point.

Claims (4)

[Claims] 1. A pouch in which a content pouring path is formed on a sealing surface of a plastic film pouch, wherein a constriction point is provided around the root of the content pouring path to facilitate opening of the pouring path. Characteristic plastic film pouch. 2. The pouch according to claim 1, wherein the sealing surfaces of the pouch are joined together as the constriction point. 3. The pouch according to claim 1, wherein a sealing surface inside the pouch is joined with another material as the constriction point. 4. The pouch according to claim 1, wherein a force is applied from the outside of the pouch to form the constriction point.