JP2018177359A - Liquid packaging bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid packaging bag in which contents do not leak even when a thin needle is pierced. SOLUTION: A first layer 11 (unstretched nylon film layer 11) is used as an outermost layer, a second layer (polyolefin-based film layer 12) is placed inside the first layer 11 (unstretched nylon film layer 11), and polyethylene resin (PE) is used as the third and fourth layers. It is a laminated layer, and the film is selected so that it has a water-stopping effect and the taste such as PE odor does not easily transfer to beverages such as water. The laminated film 10 in which these are laminated is formed in a bag shape, and the space formed by the laminated film 10 formed in the bag shape is filled with drinking water 7 [L] to 8 [L], and the diameter is 6 [. mm], when the tip angle is 20 degrees and the hole is drilled with a hollow needle 20 having a liquid take-out hole 21 near the tip, the height of the wall surface A formed by the laminated film 10 on the outer peripheral surface of the needle 20 is at least. Liquid packaging bag 1 having a size of 0.75 [mm] or more. [Selection diagram] Fig. 1

Description

  The present invention relates to a liquid packaging bag for filling a liquid for drinks and the like, and more particularly, to a liquid packaging bag suitable for being supplied to a liquid extracting device such as a water server to supply a liquid for beverage.

  Conventionally, a liquid packaging bag for filling and packaging liquid food and the like is composed of a laminated film having an inner layer and an outer layer, the inner layer is made of linear low density polyethylene (LLDPE), and the outer layer has a higher heat resistance temperature than the inner layer. There is a liquid packaging bag made of high linear low density polyethylene (LLDPE) (see, for example, Patent Document 1).

JP, 2013-018504, A

  The above-mentioned conventional liquid packaging bag is set in a water server and supplied with potable drinking water in a state where the needle is pierced. In such a use, if the needle is thick, when the cartridge is attached to the server, the needle does not stick to the end of the liquid packaging bag until the end of the needle is inclined and the perforation stops, or the contents are all the way down After use, when the liquid packaging bag is detached from the needle, a small amount of potable water remaining in the liquid packaging bag may come out of the perforation. These are effective in the direction of improvement by thinning the needle, and it is preferred to improve the thickness of the needle in the narrowest direction. However, when the diameter of the needle is reduced, the adhesion between the hole formed by piercing the needle and the needle is weakened, so that the internal pressure applied from the drinking water causes a gap, and the drinking water being filled is There is a problem of leaking from the gap.

  The present invention has been made in view of these problems, and it is an object of the present invention to provide a liquid packaging bag in which the contents do not leak even when a thin needle is pierced.

  The present invention has been made to solve at least a part of the above-mentioned problems, and can be realized as the following application example. In addition, the reference numerals in the parentheses in the column, the supplementary explanation, and the like indicate the correspondence with the embodiments described later in order to aid the understanding of the present invention, and the present invention is not limited at all. .

Application Example 1
The invention according to Application Example 1 of the present invention is
A liquid packaging bag (1) filled with liquid, wherein
at least,
Unstretched nylon film layer (11),
A polyolefin film layer (12) formed on the inside of the unstretched nylon film layer (11);
Forming a laminated film (10) in which the
The liquid is filled in a volume of 7 [L] to 8 [L] in the space formed by the laminated film (10) formed in the bag shape,
In the laminated film (10) filled with the liquid, a hollow needle (diameter 6 [mm] for taking out the liquid, the angle of the tip is 20 degrees, and the liquid extraction hole (21) is near the tip ( In the case of drilling by 20), the height of the wall surface (A) formed on the outer peripheral surface of the needle (20) by the laminate film (10) is at least 0.75 [mm] or more. It is a packaging bag (1).

  Since such a liquid packaging bag (1) is a laminated film (10) comprising an unstretched nylon film layer (11) and a polyolefin-based film layer (12) laminated on the inside, the liquid, in particular, Drinking water can be filled and stored hygienically.

  In addition, when the needle (20) is pierced and pierced into the laminate film (10), the laminate film (10) adheres to the outer peripheral surface of the needle (20), and the laminate film (10) is pulled in the piercing direction. A wall surface (A) is formed on the outer peripheral surface of (20) by the laminate film (10).

  Here, when the needle film (20) is pierced into the laminate film (10) of the liquid packaging bag (1) with the diameter of the needle (20) of 6 [mm] and the tip angle of 20 degrees, it is formed on the outer peripheral surface of the needle (20). The height of the wall surface (A) of the laminated film (10) is at least 0.75 mm or more. In this state, when 7 [L] to 8 [L] of liquid is filled in the liquid packaging bag (1), the content is obtained from the gap between the outer peripheral surface of the needle (20) and the wall surface (A) of the laminate film (10). There is no leakage of liquid, which is an object.

It is a figure which shows the general | schematic structure of the laminated film which comprises a liquid packaging bag. It is a figure which shows the external appearance of the liquid packaging bag 1. FIG. It is a figure which shows the method of the tear strength test of a liquid packaging bag. It is a figure which shows a mode at the time of sticking and perforating the needle 20 in the liquid packaging bag 1. FIG. It is a figure which shows the appearance of the needle 20 actually used. It is a figure which shows the state which mounted | wore the water server 3 with the liquid packaging bag 1. FIG.

  Hereinafter, embodiments to which the present invention is applied will be described with reference to the drawings. The embodiments of the present invention are not limited to the following embodiments at all, and may take various forms within the technical scope of the present invention.

(Structure of liquid packaging bag 1)
The structure of the liquid packaging bag 1 will be described based on FIGS. 1 and 2. FIG. 1 is a view showing a schematic structure of a laminate film 10 constituting a liquid packaging bag 1, and FIG. 2 is a view showing an appearance of the liquid packaging bag 1.

As shown in FIG. 1, the laminate film 10 is composed of four layers of a first layer 11 to a fourth layer 14.
The first layer 11 is a protective layer made of unstretched nylon film (PA (NY)), and is located at the outermost layer, and protects the liquid packaging bag 1 from impact generated when the liquid packaging bag 1 is transported or dropped. It is a layer to do.

  The second layer 12 is a barrier layer made of ethylene-vinyl alcohol copolymer (EVOH) and having high gas barrier properties, and is a layer for blocking the flow of odor from the outside to the inside of the liquid packaging bag 1.

The third layer 13 and the fourth layer 14 are layers obtained by laminating polyethylene resin (PE), and a film is selected so that the taste such as PE odor is less likely to be transferred to a water blocking effect or a beverage such as water.
The liquid packaging bag 1 has the above-described laminated film 10 in a cylindrical shape, and as shown in FIG. 2, heat is applied to the upper end portion, the lower end portion and substantially central portions in the longitudinal direction and the latitudinal direction for welding. Two bags are formed, and the welds in the longitudinal and transverse center parts are cut and shaped.

(Performance of liquid packaging bag 1)
Next, the performance of the liquid packaging bag 1 will be described based on FIG. FIG. 3 is a view showing a method of tear strength test of the liquid packaging bag 1.

  In the tear strength test, as shown in Fig. 3 for a test piece of 150 mm in length and 50 mm in width, the position of 55 mm from the lower end in the vertical direction and 25 mm from the side end in the horizontal direction Tear, measure the applied load when the tear starts. In addition, a tear measurement measures along the flow direction of a film.

  In the tear strength test of the liquid packaging bag 1, it was possible to obtain a performance value of 10 to 40 [N] at an applied load at the time of tearing.

(Function of liquid packaging bag 1)
Next, the function of the liquid packaging bag 1 will be described based on FIGS. 4 to 6. FIG. 4 is a view showing a state in which the liquid packaging bag 1 is pierced with the needle 20 and pierced, and FIG. 4 (a) is a schematic view of the pierced part, and FIG. It is an enlarged front view of a part, and Drawing 4 (c) is an expanded side view.
FIG. 5 is a view showing the appearance of the needle 20 actually used, and FIG. 6 is a view showing a state in which the liquid packaging bag 1 is attached to the water server 3.

As shown in FIG. 4A, the needle 20 which pierces the liquid packaging bag 1 is a hollow needle made of metal such as SUS material, and the outer diameter is 6 [mm].
The tip of the needle 20 is formed conically at an angle of 20 degrees, and has a water intake hole 21 communicating with the hollow portion near the tip. Drinking water focused on the liquid packaging bag 1 is taken out from the water intake hole 21 through the hollow portion. The external appearance of the needle 20 actually used is shown in FIG.

  When the needle 20 is pierced into the liquid packaging bag 1 and pierced, the laminate film 10 adheres to the outer peripheral surface of the needle 20, and the laminate film 10 is pulled in the piercing direction, as shown in FIGS. 4 (a) to 4 (c). The wall surface A is formed of the laminate film 10 as shown in FIG. The height of the wall surface A is at least 0.75 [mm] or more (in this embodiment, 0.75 [mm] to 1.5 [mm]).

  In the case of a film with a tear strength test of 10 to 40 [N], 0.75 [mm] or more is obtained even if the height of the wall A is low, and 7 [L] to 8 [L] in the liquid packaging bag 1 When the potable water is filled, the pressure applied to the wall surface A does not form a gap between the wall surface A and the outer peripheral surface of the needle 20 (in other words, it is sealed by the pressure applied to the wall surface A as pressure). ), It was confirmed that there was no water leakage from the perforated part.

Also, if the tear strength is less than 10 [N], there is a place where the height of the wall A is only 0.5 [mm] where the height is low, and 7 [L] to 8 [L] drinking water in the liquid packaging bag 1 When filled, a water leak was confirmed from this part.

Furthermore, the thickness of the laminate film 10 is 120 μm to 170 μm in consideration of impact generated during transportation or dropping, etc., but 130 μm to 150 μm in consideration of so-called residual water Is more desirable.

  Further, as shown in FIG. 6, the liquid packaging bag 1 is inserted into the cartridge 5 and set in the water server 3, and the potable water filled in the liquid packaging bag 1 through the needle 20 is gradually removed from the liquid packaging bag 1. The liquid packaging bag 1 deforms due to the decrease of the drinking water when taken out, but even in that case, the liquid packaging bag 1 is perforated until it is almost empty (practically empty as the water server 3) It was confirmed that there was no water leakage from the

(Characteristics of Liquid Packaging Bag 1)
The liquid packaging bag 1 as described above is a laminate film 10 having a first layer 11 which is an unstretched nylon film layer 11 and a second layer 12 which is a polyolefin film layer laminated on the inside thereof. Liquids, especially drinking water, can be filled and hygienically stored.

  In the case where the content of the liquid packaging bag 1 is potable water, if the liquid packaging bag 1 is hard, there is a problem when discarding the liquid packaging bag 1 with residual drinking water when taking out the drinking water. Become. On the other hand, by using the four-layer structure as described above, since adequate flexibility can be obtained, residual water can be reduced, and problems with product characteristics are also eliminated.

  In addition, when the liquid packaging bag 1 is pierced by piercing the needle 20, the wall surface A of the laminate film 10 formed in close contact with the outer peripheral surface of the needle 20 is formed. In this state, when 7 [L] to 8 [L] of liquid is filled in the liquid packaging bag 1, the drinking water which is the contents may leak from the gap between the outer peripheral surface of the needle 20 and the laminate film 10 by the wall surface A Absent.

  DESCRIPTION OF SYMBOLS 1 ... Liquid packaging bag 3 ... Water server 5 ... Cartridge 10 ... Laminated film 11 ... 1st layer 12 ... 2nd layer 13 ... 3rd layer 14 ... 4th layer 20 ... needle 21 ... Water intake hole.

Claims (1)

A liquid packaging bag filled with liquid,
at least,
Unstretched nylon film layer,
A polyolefin-based film layer formed inside the unstretched nylon film layer;
Forming a laminated film having a strength of 10 N or more in which the tear strength is obtained by laminating
The liquid is filled in a space of 7 [L] to 8 [L] in the space formed by the laminated film formed in the bag shape, and the diameter 6 [mm] for taking out the liquid in the laminated film filled with the liquid When drilling with a hollow needle having a tip angle of 20 degrees and having a liquid takeout hole near the tip, the height of the wall surface formed by the laminate film on the outer peripheral surface of the needle is at least 0.75. The liquid packaging bag characterized by becoming more than [mm].