JP3411403B2 - Liquid packaging bag - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a spout by cutting the upper side of a bag and discharging liquid from the spout by applying pressure to the body. The present invention relates to a liquid packaging bag that does not leak liquid from its spout even when the body is not pressured, even if the body is turned down. 2. Description of the Related Art As a liquid packaging bag made of film, heat sealing is performed so that an S or N-shaped meandering discharge path is formed when sealing the upper region of the bag. There is known a bag provided with seal portions that enter inside on both sides on the upper side of the liquid storage portion. Cut the upper corner of this bag and open the tip side of the S or N-shaped discharge path,
When a target is set and the body is pushed in this open state, the liquid as the content can be poured out toward the target. In this case, since the discharge path is formed in an S or N shape, contents do not spill even if the body is in the sideways posture unless the body is pressed. [0003] US Patent No. 4,491,245, US Patent No. 4,793,121, US Patent No. 49352
No. 83, Japanese Patent Publication No. 2-501823 and Japanese Patent Publication No. 3-505322 disclose a liquid packaging bag as described above, that is, a bag having a tortuous fluid passage communicating with a cavity containing a fluid. There is disclosure.
Further, an embodiment in which seal portions projecting into the cavity are formed at both ears of the cavity portion is also shown. [0004] Although the above-mentioned bag is unique, in order to prevent the liquid from leaking when it falls down, the degree of the curvature of the S or N-shaped curve of the discharge path is literally S. Alternatively, the shape of the N-shaped sharp curve and the width of the discharge path must be reduced, and furthermore, a seal portion projecting into the cavity at both ears of the cavity portion is formed, so that the pressure of the liquid flowing toward the discharge path is increased. Therefore, there is a problem that it is not possible to increase the discharge velocity of the liquid to a certain level or more. Further, there is a lower limit to the thickness of the film constituting the bag, and when the film thickness is small, there is a problem that the liquid leaks from the opening in the sideways posture. The need to increase the film thickness is disadvantageous in terms of bag manufacturing costs. The present inventors have studied the provision of a linear discharge path instead of the S or N-shaped discharge path. However, the linear discharge path can prevent liquid leakage when the liquid is turned over. Did not. Under such a background, the present invention is capable of setting the discharge flow rate in a wide range in spite of the method of providing a linear discharge path, and performing the discharge toward the target smoothly. It is an object of the present invention to provide a liquid packaging bag which can surely prevent liquid leakage when lying down and can reduce the thickness of a film constituting the bag. [0008] The liquid packaging bag of the present invention is a bag in which the peripheral edges of the front and back films (X) and (Y) are sealed, and the upper edge (1) of the peripheral edges of the bag. ) Is formed diagonally,
The oblique upper edge (1), the long side edge (2) of the left and right side edges (2) and (3), and a horizontal line extending substantially in the horizontal direction from the middle of the upper edge (1) (4) The triangular area on the upper side of the bag surrounded by the three sides shall be in a state where a heat-sealable reinforcing film (Z) is interposed between the front and back films (X) and (Y). Further, a reinforcing film (Z) is interposed substantially in parallel with the long side edge (2) from the middle of the horizontal line (4) of the triangular region (R) to the upper edge (1). Forming a linear seal portion (5) for sealing the front and back films (X) and (Y) in a state where the front and back sides are in a state between the long side edge (2) and the linear seal portion (5). (R1) is a discharge path (6). Hereinafter, the present invention will be described in detail. [0010] The bag for liquid packaging of the present invention comprises a front and back film.
The periphery of (X) and (Y) is sealed. As the films (X) and (Y), single-layer or multi-layer films including polyethylene, polypropylene, polyester, and polyamide are used, and at least the inner surface thereof is heat-sealable. Although the thicknesses of the films (X) and (Y) can be set appropriately, it is one of the features of the present invention that a relatively thin thickness such as 30 to 150 μm may be used. The upper edge (1) of the peripheral edge of the bag is formed at an angle of about 40 to 60 degrees with respect to the horizontal direction. In the present invention, the upper edge (1) formed obliquely and the longer side edge of the left and right side edges (2) and (3) are used.
(2) and a triangular area on the upper side of the bag, surrounded by three sides of a horizontal line (4) going almost horizontally from the middle of the upper edge (1)
(R) is a state in which a heat-sealable reinforcing film (Z) is interposed between the front and back films (X) and (Y). As the reinforcing film (Z), by providing a heat-fusible resin layer on both sides of the base film, the reinforcing film (Z) is more rigid than the front and back films (X), (Y) ), And a film having heat sealing properties is preferably used.
It is not limited to a layer film. Here, as the base film, a polypropylene film, a polyester film,
A film such as a polyamide film or a biaxially stretched product thereof may be mentioned. As the heat-fusible resin layer, low-density polyethylene, linear low-density polyethylene, ethylene-vinyl acetate copolymer, ethylene-unsaturated carboxylic acid (or Salt or ester) copolymer.
The thickness of the reinforcing film (Z) is suitably about 50 to 500 μm. Further, in the present invention, the reinforcing film (from the middle of the horizontal line (4) of the above-mentioned triangular area toward the upper edge (1) is substantially parallel to the long side edge (2). The front and back films (X) and (Y) with the Z) interposed therebetween are sealed to form a linear sealing portion (4). The region (R1) between the side edge (2) on the long side and the linear seal portion (5) becomes the discharge path (6). The filling of the liquid takes place from the bottom of the bag, and after filling, the bottom is sealed. In addition, the bottom of the bag can be formed into a self-standing bag by forming it into a mountain shape in a side view.In this case, the liquid is filled from the lower position of the upper edge (1) formed diagonally, and after filling. Seal the location. The liquid packaging bag of the present invention having the above-mentioned structure can be used for adhesives, beverages, liquid foods, liquid detergents, liquid cosmetics,
It is used for packaging various liquids including liquid fertilizers and chemicals. In addition, the liquid refers to a liquid that can flow, regardless of the degree of viscosity. In the liquid packaging bag of the present invention, the upper edge (1), the long side edge (2), and the middle edge of the upper edge (1), which are formed obliquely, are substantially horizontal. The triangular area (R) on the upper side of the bag, which is surrounded by the three sides of the horizontal line (4),
A heat-sealable reinforcing film (Z) is interposed between (X) and (Y), and the horizontal line (4) of the triangular region (R) is in the middle to upper edge (1). Towards the long side edge
Substantially parallel to (2), the front and back films (X) and (Y) with the reinforcing film (Z) interposed therebetween are sealed to form a linear sealing portion (5). Therefore, if the tip of the triangular region (R) is cut and opened, the region (R1) between the long side edge (2) and the linear seal portion (5) becomes the discharge path (R1). If the pressure is applied to the body of the bag, the liquid content is poured out through the discharge passage (6) in accordance with the pressure. The small triangular region (R2) formed by the linear seal part (5) and the lower half of the upper edge (1) of the triangular region (R) is blind,
The small triangular region (R2) plays a role in relieving the pressure applied to the liquid by the pressing of the body. When no pressure is applied to the body, the above-mentioned discharge path is closed flat due to the presence of the reinforcing film (Z), and the liquid from the discharge path (6) is obtained even if the bag is turned over. Leakage is reliably prevented. As described above, in the bag of the present invention, the reinforcing film (Z) is interposed in the triangular region (R) on the upper side of the bag, so that the thickness between the front and back films (X) and (Y) is increased. And the thickness difference is used for automatically opening and closing the discharge path (6), so that the thickness of the front and back films (X) and (Y) can be reduced. EXAMPLES Next, the present invention will be further described with reference to examples. Example 1 FIG. 1 is a front view showing an example of a liquid packaging bag according to the present invention, and FIG. 2 is a sectional view taken along line AA of FIG. In the figure, the portions indicated by scattered points are heat seal portions. Nylon / linear low density polyethylene (1
5 μm / 60 μm) having a layer structure of
Bags were prepared using the front and back films (X) and (Y). Linear low density polyethylene / biaxially oriented polypropylene / linear low density polyethylene (80 μm / 1
Left and right side edges (2) with a three-layered reinforcing film (Z) having a layer structure of 6 μm / 80 μm) interposed between the front and back films (X) and (Y) on the upper side of the bag. , (3), and the upper edge (1) was heat-sealed at an angle of 45 °, and at the same time, excess portions were blown and removed. As a result, the upper edge (1) formed obliquely, the longer side edge (2) of the left and right side edges (2) and (3), and the upper edge
The triangular area (R) on the upper side of the bag, which is surrounded by the three sides of the horizontal line (4) extending in the horizontal direction from the middle of (1), is a reinforcing film (R) between the front and back films (X) and (Y). Z) was interposed, so the middle part of the horizontal line (4) of the triangular area (R) was extended from the middle to the upper edge (1) in parallel with the long side edge (2). Film (X) with front and back films (X),
(Y) was sealed to form a linear seal portion (4).
The area between the long side edge (2) and the linear seal (5) (R
1) becomes the discharge path (6). The small triangular region (R2) formed by the linear seal portion (5) and the lower half of the upper edge (1) of the triangular region (R) is blind. After filling a liquid (for example, an adhesive) from the bottom of the bag thus prepared, the bottom was heat-sealed, and the portion indicated by cut in FIG. 1 was cut. Even if the bag is turned sideways in this state, the discharge path
No liquid leakage from (6) occurs. In addition, by holding the body of the bag by hand and pressing the body, the liquid can be poured smoothly toward the target. The tip of the discharge path (6) can serve as a spatula. Embodiment 2 FIG. 3 is a front view of a main part showing another example of the liquid packaging bag of the present invention. In this embodiment, the linear sealing portion
The formation of (5) is started from a position slightly above the horizontal line (4) to the upper edge.
Going toward (1). Even in this case, the liquid discharge performance and the liquid leakage prevention performance are almost the same as those in the first embodiment. According to the liquid packaging bag of the present invention, the discharge flow rate can be set in a wide range, and the discharge toward the target can be performed smoothly, even though the liquid discharge bag is of the type in which a linear discharge path is provided. This can reliably prevent the liquid from leaking when lying down, and can reduce the thickness of the film constituting the bag.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view showing an example of a liquid packaging bag of the present invention. FIG. 2 is a sectional view taken along line AA of FIG. FIG. 3 is a front view of a main part showing another example of the liquid packaging bag of the present invention. [Explanation of symbols] (X), (Y): Front and back films, (Z): Reinforcement film, (R): Triangular area, (R1): Area, (R2): Small triangular area, (1 ) Upper edge, (2) Longer side edge, (3) Shorter side edge, (4) Horizontal line, (5) Linear seal, (6) Discharge path

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B65D 33/38 B65D 30/24

Claims (1)

(57) [Claims] (1) A bag in which the peripheral edges of the front and back films (X) and (Y) are sealed, and the upper edge (1) of the peripheral edges of the bag is formed obliquely. , The upper edge (1) formed obliquely, and the left and right side edges (2), (3) of the long side (2), and the middle of the upper edge (1) are directed almost in the horizontal direction. The triangular area (R) on the upper side of the bag surrounded by the three sides of the horizontal line (4) is a state in which a heat-sealable reinforcing film (Z) is interposed between the front and back films (X) and (Y). Further, from the middle of the horizontal line (4) of the triangular region (R) toward the upper edge (1), the reinforcing film (Z) is almost parallel to the long side edge (2). ) With the front and back films interposed
Form a linear seal (5) to seal (X), (Y),
The area (R) between the long side edge (2) and the linear seal (5)
A liquid packaging bag, wherein 1) is formed as a discharge path (6).