JP6578335B2 - Liquid storage bag - Google Patents

Description

  The present invention relates to a liquid material storage bag. More specifically, the present invention relates to a liquid material storage bag made of a film that stores a liquid material in a liquid or paste form.

Conventionally, seasonings such as soy sauce, sauce, hot pepper, ketchup, mayonnaise are often sold with bento boxes, hamburgers, instant noodles, natto and the like. These liquid seasonings (soy sauce, sauce, etc.) or paste-like seasonings (spicy, ketchup, mayonnaise, etc.) are often provided sealed in a sachet of a resin film.
However, when opening these sealed sachets of liquid or paste-like seasonings, the seasonings may scatter, dirty hands, or, in the worst case, dirty clothes.

In order to solve the above problems, various inventions have been proposed.
JP 2008-179393 (hereinafter referred to as Patent Document 1) and JP 2009-83936 (hereinafter referred to as Patent Document 2) state that “after folding the laminated film in the width direction, both side edges of the laminated film are placed vertically. Narrow pouring passage that is heat-sealed and has a horizontal seal at the upper and lower ends, and communicates with the space to be packaged on the folded side of the upper horizontal seal portion where no vertical seal is applied. Is disclosed.
Japanese Patent Laid-Open No. 10-147354 (hereinafter referred to as Patent Document 3) discloses a liquid or paste-like substance enclosure having a meandering passage.
Japanese Patent Application Laid-Open No. 2000-159246 (hereinafter referred to as Patent Document 4) discloses that a pouring path has a narrow width portion and a bent portion so that a pressure loss is generated such that the content does not leak out only by the internal pressure of the liquid content. A sachet is disclosed that is formed into a shape having.

JP 2008-179393 A JP 2009-83936 A Japanese Patent Laid-Open No. 10-147354 JP 2000-159246 A

In the inventions described in Patent Document 1 and Patent Document 2, if the width of the pouring passage is too large, the liquid material flows out at the same time as opening, so that it is easy to get dirty. A problem has been found that makes it extremely difficult to squeeze out objects.
Further, it has been found that the invention described in Patent Document 3 has a problem that it is difficult to squeeze out the liquid material although the liquid material does not scatter when opened.
The invention described in Patent Document 4 has been found to be extremely difficult to squeeze the contents because it has a narrow width portion and a bent portion, although the contents are difficult to leak.

  Therefore, the present inventor does not leak the contents when opened (hereinafter, the characteristic that the contents are difficult to leak at the time of opening may be referred to as “non-leakage”), and the contents with a slight press. We sought out the development of a liquid material storage bag that can squeeze out things and stop the flow of liquid when the pressure is stopped.

As a result, in the liquid material storage bag in which the two stacked films are welded and the liquid material is stored inside, a welded part with a specific structure is provided, which has both “non-leakage” and “pourability controllability”. Thus, the present inventors have found that the storage bag is less likely to be filled in the pouring passage even when the liquid material is highly filled, and the present invention has been completed.
That is, the first aspect of the present invention is:
It is a liquid material storage bag in which a liquid material is stored in a storage part formed by welding two stacked films,
The storage section is
A longitudinally-sealed portion of a linear strip shape by welding or a linear shape by film folding;
A linear belt-like horizontal sealing portion by welding substantially orthogonal to the vertical sealing portion,
The vertical sealing portion includes a first welding and protruding portion protruding to the inside of the storage portion,
The lateral sealing portion includes a second welding start portion protruding to the inside of the storage portion,
The first welding and projecting portion and the second welding and projecting portion define a pouring portion together with the vertical sealing portion and the lateral sealing portion,
Furthermore, the pouring part comprises a pouring passage defined by the lateral sealing part and the first welding and projecting part at the tip thereof,
The diameter of the pouring passage is constant or monotonously decreased from the pouring passage entrance to the pouring passage exit.
The ratio of the depth of the first welding and protruding portion to the pouring passage inlet diameter is 0.5 or more and 3.0 or less,
The vertical sealing portion peripheral line and the horizontal sealing portion peripheral length are set to the length of the line segment connecting the intersection of the vertical sealing portion peripheral line and the horizontal sealing portion peripheral line and the second welded protrusion start point. The ratio of the value obtained by multiplying the sine ratio of the intersection angle of the lines to the depth of the first weld protrusion is 1.0 or more and 3.5 or less,
When reaching to the housing portion and the second welded protruding portion points the second weld protruding portion the second weld protruding portion deepest point than the starting point on the boundary line demarcating the,
i) The distance between the point and the vertical sealing portion peripheral line is constant or monotonically increasing,
ii) The ratio of the distance between the deepest point of the first welding and protruding portion and the deepest point of the second welding and protruding portion to the pouring passage inlet diameter is 1.0 or more,
The ratio of the depth of said 2nd welding protrusion part with respect to the inlet diameter of the said pouring channel | path is 0.8-2.0, It is a liquid storage bag characterized by the above-mentioned.
Further, as a preferred embodiment of the first aspect, the second aspect of the present invention, in addition to the above first aspect, a point on the boundary line demarcating the housing portion and the second weld protruding portion is the When reaching the deepest point of the second welded projecting portion from the start point of the second welded projecting portion , iii) the length of the line segment connecting that point and the deepest point of the first projecting projecting portion is always the pouring path It is a liquid material storage bag that is larger than the inlet diameter.

In the liquid material storage bag of the present invention, even if the storage bag is in a highly filled state of the liquid material, the liquid is not poured into the passage and the degree of the liquid material filling is low, so that the hands are not soiled.
In addition, when applied to a pouch bag with a large capacity, a large amount of liquid material does not spill out even when the opened bag is turned over, which is highly convenient.

It is a planar view schematic diagram of one Embodiment of the liquid storage bag of this invention. It is a planar view schematic diagram which shows other embodiment of the liquid storage bag of this invention. It is a planar view schematic diagram of the modification of the liquid storage bag of this invention. It is a planar view schematic diagram which shows other embodiment of the liquid storage bag of this invention. It is a planar view schematic diagram which shows other embodiment of the liquid storage bag of this invention. It is a planar view schematic diagram which shows other embodiment of the liquid storage bag of this invention. It is a planar view schematic diagram of the other modification of the liquid storage bag of this invention. It is a planar view schematic diagram which shows other embodiment of the liquid storage bag of this invention. It is a planar view schematic diagram which shows other embodiment of the liquid storage bag of this invention. It is a planar view schematic diagram which shows the liquid material storage bag of a prior art. It is a planar view schematic diagram which shows other embodiment of the liquid storage bag of this invention. It is a planar view schematic diagram which shows the form which does not belong to the scope of the present invention. It is a planar view schematic diagram which shows other embodiment of the liquid storage bag of this invention. It is a planar view schematic diagram which shows other embodiment of the liquid storage bag of this invention.

Next, embodiments of the present invention will be described with reference to the drawings. In the following description of the drawings, the same portions are denoted by the same reference numerals. It should be noted that the drawings are schematic and ratios of dimensions of the respective parts do not always match the actual ones.
Further, the embodiments described below exemplify the technical idea of the present invention, and the technical idea of the present invention is not specified as follows. The technical idea of the present invention can be variously modified within the technical scope described in the claims.

  As shown in FIGS. 1 and 2, the liquid material storage bag (1) according to the embodiment of the present invention stores the liquid material (3) in a storage portion (2) formed by welding two stacked films. It is a liquid material storage bag. Here, the “double film” may be a film obtained by stacking two films, or may be a film obtained by folding a single film in the width direction. In FIG. 1, a single film folded in the width direction is used. In any case, the “two-layered film” is provided with a storage portion (2) by welding the open peripheral edge portion and sealing the liquid material (3). When two films are used, the storage part (2) is defined by a sealing part by welding. On the other hand, when a single film is used, the storage part (2) is defined by a sealing part by welding or film folding. Hereinafter, the “sealing portion by welding” and the “sealing portion by film folding” that define the boundary of the storage portion (2) may be simply referred to as the sealing portion (4) without being distinguished from each other.

  In the present invention, the liquid (3) includes a pasty fluid in addition to a liquid. Specific examples include liquid seasonings represented by soy sauce and chili oil, and paste-like seasonings such as ketchup, mustard, mayonnaise, and dressing. In addition, liquid cosmetics such as liquid detergents, shampoos and rinses can be mentioned.

In the present invention, the storage part (2) has a linear strip shape by welding or a linear longitudinal sealing portion (41) by film folding, and a linear strip shape by welding substantially orthogonal to the vertical sealing portion (41). A horizontal sealing portion (42). In the above description, the terms `` vertical '' and `` horizontal '' mean one sealing part that runs in the vertical direction in the plan view of the liquid material storage bag (2) as `` vertical sealing part ''. The one sealing portion that is substantially orthogonal to the “vertical sealing portion” is referred to as a “horizontal sealing portion”, and is a vertical seal and a horizontal seal in the (continuous) manufacturing method of the liquid material storage bag (1). Do not understand the meaning of.
By being substantially orthogonal to each other, the two sealing portions define the corners of the storage portion (2) and contribute to the formation of the pouring passage (7) or the pouring passage outlet (72) described later. Incidentally, the vertical sealing portion (41) may be not only by welding but also by film folding, for the reason described later, the lateral sealing portion (42) must be a sealing portion by welding, It must not be a sealed part by film folding. The reason for this is that when the lateral sealing portion (42) is formed by folding the film, the film still has a force to restore the state before folding due to residual stress, so the pouring passageway (7) It is because it becomes easy to spread and it is inferior to non-leakage.

  Next, the term “substantially” orthogonal means that, in addition to the case of being orthogonal, typically the storage unit side peripheral line of the vertical sealing portion (41) (hereinafter simply referred to as “longitudinal sealing”) without departing from the spirit of the present invention. The angle of intersection on the storage portion side (hereinafter referred to as “the peripheral edge line of the stopper portion) (41L) and the storage portion side peripheral line (hereinafter simply referred to as the peripheral sealing portion peripheral line) (42L) of the horizontal sealing portion (42)” Peripheral line intersection angle ") (θ) means including 60 degrees or more and less than 90 degrees. Preferably, the peripheral line intersection angle (θ) is 70 degrees or more and 90 degrees or less, more preferably 80 degrees or more and 90 degrees or less, and most preferably 90 degrees. Note that “the intersection of the vertical sealing portion peripheral line (41L) and the horizontal sealing portion peripheral line (42L) on the storage unit side” (O) is simply referred to as “vertical / horizontal sealing portion peripheral line intersection”. Yes. FIG. 1 shows an example when the peripheral line intersection angle (θ) is 90 degrees, and FIG. 2 shows an example when the peripheral line intersection angle (θ) is 60 degrees or more and less than 90 degrees.

  The storage part (2) protrudes from the vertical sealing part (41) to the storage part (2) side, and from the horizontal sealing part (42) to the storage part (2) side. And a second welding and projecting portion (11) (FIGS. 1 and 2).

  The vertical sealing portion (41), the horizontal sealing portion (42), the first welding and protruding portion (10), and the second welding and protruding portion (11) define the pouring portion (6). is doing. Further, the pouring portion (6) has a pouring passageway (7) defined at the tip thereof by a horizontal sealing portion (42) and a first welding and pouring portion (10).

The storage part (2) is provided with the first welding and projecting part (10) and the second welding and projecting part (11) with specific requirements. The liquid material storage bag (1) can have both the pouring controllability and the non-leakage property, and is the most important feature of the present invention.
Hereinafter, the requirements to be included in the first welding and projecting portion (10) and the second welding and projecting portion (11) will be described in detail.

<First welding protrusion>
Hereinafter, the first welding and protruding portion (10) will be described with reference to FIGS.
The boundary between the storage part (2) and the first welded out part (10) moves along the vertical sealing part peripheral line (41L) from the vertical / horizontal sealing part peripheral line intersection (O) In this case, the process starts from the point (P1) where the first protrusion starts, passes through the point (P2) that protrudes most inside the storage portion (2), and ends at the point (P3) where the protrusion ends. Hereinafter, the start point (P1) of the first welding and protruding portion may be referred to as a “first protruding start point”. In addition, the deepest point (P2) of the first welding and protruding portion may be referred to as "first protruding deepest point" and the end point (P3) of the first welding and protruding portion may be referred to as "first protruding end point". There is .
Here, when the deepest protruding portion of the first welding protruding portion (10) is a line segment parallel to the longitudinal sealing portion peripheral line (41L), the first appearing point (that is, the lateral sealing portion peripheral line) The point closest to (42L) is the first projecting deepest point (P2) (Fig. 1).
The first projecting end point (P3) is returned to the longitudinal sealing part peripheral line (41L) in principle, but if the storage part (2) is rectangular, it is irregularly sealed laterally. It may be on the storage part side peripheral line (42L ') of the other lateral sealing part (42') facing the part (42) (FIG. 3). However, in such an irregular example, the volume of the storage part (2) must be sacrificed. Therefore, it is preferable that the first protruding end point (P3) is on the longitudinal sealing portion peripheral line (41L).

  Out of the boundaries that define the storage part (2) and the first welding and projecting part (10), the boundary line from the first projecting start point (P1) to the first projecting deepest point (P2) is the horizontal sealing part. Together with (42), a pouring passageway (7) is formed.

With the above configuration, the line segment (OP1) forms the pouring passage outlet (72). In the present invention, the pouring passage inlet (71) is a point (P2h) perpendicular to the lateral sealing portion peripheral line (42L) from the first projecting deepest point (P2) and the first projecting. It is assumed that the line segment (P2P2h) connecting the deepest point (P2) points to a part (FIGS. 1 and 2).
Thus, the distance from the first protruding start point (P1) to the lateral sealing portion (42) becomes the pouring passage outlet diameter (do), and from the first protruding deepest point (P2) to the lateral sealing portion (42). The distance to reach is the pouring passage inlet diameter (di).

In the present invention, the pouring passage diameter (d) must be constant or monotonously decreased from the pouring passage inlet (71) to the pouring passage outlet (72) so as not to impair the pouring controllability. I must.
In order to keep the pouring controllability better, it is more preferable that the pouring passage (7) has no step. Accordingly, it is preferable that the pouring passage diameter (d) is constant or tapered (tapered structure) from the pouring passage inlet (71) to the pouring passage outlet (72).
From the viewpoint of achieving both pouring controllability and non-leakage, the pouring passage diameter (d) must be constant from the pouring passage inlet (71) to the pouring passage outlet (72). Even more preferred.

The first welded out portion (d) satisfying the requirement that the diameter (d) of the pouring passage is constant or tapered (tapered structure) from the pouring passage inlet (71) to the pouring passage outlet (72). the shape of 10), other strip (FIG. 1), triangular (FIG. 4), V-shaped (FIG. 5), U-shaped (FIG. 6), etc. trapezoidal and the like. If the reduction in the volume of the storage portion is not limited, as described above, as a modified example, the `` first welding and protruding portion '' is integrated with the vertical sealing portion (41) up to the lower end portion of the storage portion. (Figure 3).
As long as the above requirements are satisfied, there is no particular restriction on the shape formed by the line from the first projecting deepest point (P2) to the first projecting end point (P3), but the volume of the storage part (2) is impaired. It is a good idea to have a shape that does not exist.

Next, as a requirement to be satisfied by the first welded and projected portion ( 10 ), the ratio (D1 / di) of the depth (D1) of the first welded and projected portion to the pouring passage inlet diameter (di) is 0.5. The ratio (D1 / di) of the depth (D1) of the first welded projecting portion to the pouring passage inlet diameter (di) is 0.5 or more and 3 or less. .0.0 or less ”, the abbreviation“ requirement (1) ”may be used. Here, the depth (D1) of the first welding and protruding portion refers to the distance between the first protruding deepest point (P2) and the vertical sealing portion peripheral line (41L).
The protruding depth (D1) affects not only “pour controllability” of the liquid material storage bag (1) but also the degree of liquid material filling in the pour channel (7) in an unloaded state. Here, the no-load state refers to a state where the liquid storage bag (1) is placed horizontally without being pressed. For the purpose of the present invention, it is preferable that the degree of fullness in the liquid pouring passage (7) is low. Hereinafter, the degree of fullness will be expressed and evaluated using the term “passage low fillability”. If the passage is poorly filled (the degree of fullness of the liquid in the pouring passage is high), the result is dirty hands.
If the above ratio (D1 / di) is less than 0.5, the passage low filling property is inferior, so as soon as the liquid storage bag (2) is opened, the liquid (3) is discharged from the pouring passage (7). It becomes difficult to open the liquid storage bag (2) without spilling and getting hands dirty. The ratio (D1 / di) is preferably 1.0 or more, and more preferably 1.5 or more.
On the other hand, when the ratio (D1 / di) exceeds 3.0, the pouring controllability of the liquid storage bag (2) is deteriorated. The ratio (D1 / di) is preferably 2.5 or less, and more preferably 2.2 or less.

<Second weld protrusion>
Next, the second welding and protruding portion (11) will be described with reference to FIGS.
The boundary between the storage part (2) and the second welded out part (11) moves from the vertical / horizontal sealing part peripheral line intersection (O) along the horizontal sealing part peripheral line (42L). When it does, it starts from the point (Q1) where the first protrusion starts, passes through the point (Q2) that protrudes most inside the storage part (2), and ends at the point (Q3) where the protrusion ends (Fig. 1 , Fig . 1) . 2 ). Hereinafter, the start point (Q1) of the second welding and protruding portion (11) may be referred to as a “second protruding start point”. In addition, the deepest point (Q2) of the second welded projecting portion (11) is the second projecting deepest point, and the end point (Q3) of the second welded projecting portion (11) is the second projecting point (Q3). Sometimes referred to as "end point". Here, when the deepest protruding portion of the second welding protruding portion (11) is a line segment parallel to the lateral sealing portion peripheral line (42L), the first appearing point (that is, the vertical sealing portion peripheral line) The point closest to (41L)) is the second projecting deepest point (Q2) (Fig. 1).
The second protruding end point (Q3) is basically returned to the lateral sealing portion peripheral line (42L), but as an irregular example, when the storage portion (2) is rectangular, the vertical sealing is performed. It may be on the storage part (2) side peripheral line (41L ′) of the other vertical sealing part (41 ′) facing the part (41) (FIG. 7). However, in such an irregular example, the volume of the storage part (2) must be sacrificed. Therefore, it is preferable that the second protrusion end point (Q3) is on the lateral sealing portion peripheral line (42L).

In the above basic configuration, the second welded and projecting portion (11) must satisfy the following requirements.
First, regarding the second protrusion start point (Q1), the length (L2) of the line segment OQ1 connecting the vertical / horizontal sealing portion peripheral line intersection (O) and the second protrusion start point (Q1) is expressed as “the peripheral line intersection angle”. The ratio (L2 * sinθ / D1) of the value (L2 * sinθ) multiplied by the sine ratio of (θ) to the depth (D1) of the first welded protrusion is 1.0 or more and 3.5 or less It is necessary to be. For the sake of convenience, the abbreviation “requirement (2)” may be simply used for the requirement “L2 * sin θ / D1) is 1.0 or more and 3.5 or less”.
When the ratio (L2 * sinθ / D1) is less than 1.0, a bottleneck is formed at the pouring passage inlet (71), and the pouring property is lowered.
On the other hand, when the ratio (L2 * sinθ / D1) exceeds 3.5, the above-described low passage filling property is inferior. Preferably, the ratio is 3.0 or less.
In general, θ is 90 degrees. In this case, “requirement (2)” is “L2 / D1) is 1.0 or more and 3.5 or less”.

Then, reaching the housing part (2) and the second weld protruding portion points on the boundary line demarcating the (11) (Q) is a second push-out start point (Q1) from the second push-out deepest point (Q2) When
i) The distance (H) between the point (Q) and the longitudinal sealing portion peripheral line (41L) is constant or monotonically increasing,
ii) The ratio of the distance (D3) between the first projecting deepest point (P 2 ) and the second projecting deepest point (Q2) to the pouring channel inlet diameter (di) is 1.0 or more. For convenience, the distance between the "ii) first overhang deepest point of the (P 2) and the second push-out deepest point (Q2) of the (D3), ratio of channel inlet diameter (di) pouring the The requirement of “1.0 or more” may be simply referred to as “requirement (3)”.
By satisfying the requirements of i) and ii) above, the second weld and projecting portion (11) forms the pouring portion (6) together with the first weld and projecting portion (10), and the pouring controllability is improved. Keeps good.
The i), in addition to the requirements of ii), additionally, previously described "iii) housing part (2) and the point on the second weld protruding portion (11) borders demarcating the (Q) and the first When the length (r) of the line connecting the projecting deepest point (P2) is always greater than or equal to the pouring passage inlet diameter (di) '', the pouring passage entrance from the storage section (2) is satisfied. Since the bottleneck is not formed in the pouring part (6) until reaching (71), pouring can be performed with a smaller pressure. Thereafter, for convenience, the "iii) housing part (2) and the second weld protruding portion (a line segment connecting a point on the boundary line demarcating the 11) (Q) and the first push-out deepest point (P2) (QP2 ) Is always referred to as “additional requirement (3) ′” for the preferred embodiment.

The most important requirement to be satisfied by the second welding and projecting portion (11) is the ratio (D2 / di ) of the depth (D2) of the second welding and projecting portion to the pouring passage inlet diameter (di). Surprisingly, it has been found that when the above ratio (D2 / di ) reaches a critical value of 0.8 or more, the “passage low fillability” is drastically improved .
Therefore, in the present invention, the ratio (D2 / di ) is set to 0.8 or more. The ratio is preferably 0.9 or more, and more preferably 1.0 or more.
However, when the ratio (D2 / di ) exceeds 2.0, the pressure required for pouring is increased, which is not preferable. The upper limit of the ratio (D2 / di ) is more preferably 1.5 or less, and still more preferably 1.3 or less. By setting the ratio in the range of 0.9 to 1.5, a storage bag in which “low passage filling” and “pourability” are balanced can be obtained.

There are no particular restrictions on the shape of the second welded projecting portion (11) as long as it forms a region projecting from the lateral sealing portion (42) to the inside of the housing portion based on the above requirements. Such areas include strip-shaped areas ( FIG. 1 ), V-shaped (FIG. 5), U-shaped (FIG. 6), arc-shaped (FIG. 5) boundaries between the area and the storage section (2). 8) are included, but these are exemplifications, and those having other shapes are within the scope of the present invention as long as the above-described requirements are satisfied.

  In the present invention, the vertical sealing portion (41) and the horizontal sealing portion involved in the formation of the pouring portion (6), the pouring passage (7), the pouring passage inlet (71) and the pouring passage outlet (72). There are no particular restrictions on the shape of the sealing part other than (42). For example, FIG. 9 shows an example in which the sealing portion other than the vertical sealing portion (41) and the horizontal sealing portion (42) is formed in a curved belt shape.

The liquid material storage bag of the present invention has an excellent balance between “non-leakage” and “pourability controllability” as compared with the conventional liquid material storage bag, while having the same pouring passage diameter.
That is, if the present invention is applied to a sachet for storing seasoning liquid (soy sauce, sauce, hot pepper, ketchup, mayonnaise or other seasoning) attached to a lunch box, over-the-counter hamburger, instant noodles, natto, etc. The amount of liquid to be poured out can be adjusted to a desired amount. In addition, if applied to a slightly larger pouch bag such as a cooking seasoning liquid storage bag, refill shampoo, rinse, etc., even if the opened bag is turned over, the liquid does not leak or the amount that leaks out. Because there are few, the surrounding dirt can be minimized. Furthermore, since the outflow of the liquid from the bag stops when the pressing is stopped, it is easy to adjust the amount of liquid poured out, and a troublesome refilling operation becomes unnecessary.
As described above, the liquid storage bag (2) of the present invention is excellent in pouring controllability and non-leakage and can be applied to bags of various sizes according to the purpose. There is a suitable range depending on the size of the bag.
In the case of the above-mentioned seasoning liquid storage sachet, the range of the pouring passage diameter (7) can be suitably selected from the range of 2 to 15 mm. Here, the seasoning liquid storage pouch includes a bag having a vertical length of 160 mm or less and a horizontal length of 160 mm or less.
On the other hand, in the case of the above-mentioned pouch bag, it can be suitably selected from the range of 10 to 30 mm. Here, the pouch bag includes a bag having a vertical length of 80 mm or more and a horizontal length of 80 mm or more.

  In the liquid material storage bag (1) of the present invention, a notch part and a cut part can be provided on the outer edge of the lateral sealing part (42) in the vicinity of the pouring passage outlet (72) in order to improve the opening property. Alternatively, a known method of providing a tear guide line from the vicinity of the pouring passage outlet (72) near the outer edge of the lateral sealing portion (42) to the first welded out portion (10) can also be suitably employed.

  In the present invention, a known resin film that can be welded can be suitably used as the film constituting the liquid material storage bag (1). As the resin film, a film obtained by vapor deposition with an intermediate material as needed, or a laminated film obtained by laminating different kinds of substrate films with a sealant film can be suitably used. Examples of the resin constituting the base film include polypropylene, polyethylene terephthalate, polyamide, polyvinyl alcohol, and ethylene / vinyl alcohol copolymer. Moreover, the film which coat | covered polyvinylidene chloride on the base film which consists of these resin can also be used. Examples of the sealant film include polyethylene, polyvinyl acetate, ethylene acrylic acid copolymer, and ion-crosslinkable ethylene-based copolymer that are highly heat-weldable. Examples of the intermediate material to be deposited include aluminum, silicon oxide, and alumina.

  Moreover, a film thickness within a range of 40 to 120 μm known to those skilled in the art can be suitably used.

  As a welding method, a known welding method such as heat sealing, impulse sealing, ultrasonic sealing, high-frequency induction heating sealing, or the like can be adopted.

There are no particular restrictions on the method for producing the liquid storage bag (1) of the present invention, and conventionally known three-way sealing and four-side sealing methods can be suitably used.

The liquid material storage bag (1) of the present invention having both “non-leakage” and “pour-out control” is more efficiently manufactured by three-side seal packaging, particularly by the following procedure.
That is, after the vertical sealing portion (41) is formed in advance, the horizontal sealing portion (42) is formed by the welding mold together with the first welding protruding portion (10) and the second welding protruding portion (11). In this case, the region of the mold corresponding to the pouring passageway (7) and the pouring portion (6) is not formed as a concave structure, but is formed by forming a mold in which the concave portion is filled with a heat insulating material. A liquid material storage bag (1) is obtained in which the liquid material (2) does not enter the dispensing part (6) and the pouring passage (7) very little.
Although the reason why the liquid storage bag (1) is more effectively provided with the characteristics of “non-leakage” and “pouring controllability” by this procedure is not clear, when welding the horizontal sealing part (42) Furthermore, the liquid material (3) filled in the area corresponding to the pouring part (6) and the pouring passage (7) is welded while being pushed out toward the storage part (2) by the heat insulating material described above. As a result, the inventor believes that the pouring passage portion is solidified while maintaining a volume that does not contain the liquid material.

Hereinafter, the effects of the present invention will be described in detail with test examples.
<Preparation of test soy sauce sachets>
Prior to the series of tests, a rectangular soy sauce storage sachet containing soy sauce was prepared by a three-way welding sealing method in which a polyamide / polyethylene two-layer laminated film having a thickness of about 60 μm was continuously produced.
The outline of the test soy sauce storage sachet is as follows.
<Test soy sauce storage sachet>
-Perimeter line length of the vertical sealing part: 40 mm
-Perimeter line length of the lateral sealing part: 40 mm
-Content weight: about 5 grams-Soy sauce filling state: The entire sachet is fully filled with no air bubbles. In the horizontal mounting state, the maximum thickness of the central portion of the storage unit is 8 mm, and the storage bag is in a highly filled state with soy sauce.
In addition, in order to improve the unsealing property and eliminate the unevenness of the unsealing property, a cut is made from the upper end portion of the lateral sealing portion toward the pouring passage.

<Preliminary test 1>
If the test soy sauce sachet is left as it is, the soy sauce solution fills the entire storage area, including the four corners.So, when the corners or sides are opened, the liquid leaks immediately, and it is opened and poured out without soiling the hands. It is extremely difficult to do.

<Preliminary test 2>
The first welding protrusion part of the rectangular strip shape was formed only in the vertical sealing part of the soy sauce storage sachet for test with the heat welding tool. In addition, the horizontal sealing part is also formed by welding, and the second welding protruding part is not formed (FIG. 10).
Using this bag, the range of the pouring passage inlet diameter (= pouring passage outlet diameter) (di) is changed to 3 to 10 mm, and the depth (D1) of the first welded projecting portion is changed to the range of 3 to 20 mm. Various attempts have been made, but a state in which the liquid is filled in the pouring passage cannot be avoided, and a soy sauce storage sachet having both non-leakage and pouring controllability cannot be obtained.
In addition, the evaluation rank of “Liquid fullness”, “Non-leakage” and “Pourout controllability” in this preliminary test and each of the following tests and the rank display in the table are as follows unless otherwise noted. is there;
1) Low passage fullness The following ranking is performed according to the degree of liquid (soy sauce) filling in the pouring passage of the test soy sauce sachets placed horizontally without pressing.
・ Very good: ◎ (There is almost no soy sauce permeating the passage)
・ Good: ○ (a small amount of soy sauce has penetrated the passage)
・ Bad: × (Soy sauce is filling the passage)
* Because the storage bag is transparent, the soy sauce filling level can be easily determined by the color of the pouring passage.
2) Non-leakage property The degree of liquid leakage when the pouch passage portion of the test soy sauce storage pouch is cut and the opened pouch is placed on a horizontally laid tissue paper is observed.
-Very good: ◎ (soy sauce does not spill out)
・ Good: ○ (a few drops of soy sauce)
・ Bad: × (Soy sauce leaks immediately)
* Soy sauce leaks can be judged immediately based on how dirty the tissue paper is.
3) Pouring controllability-Very good: ◎ (Smooth soy sauce comes out smoothly with a slight press. The outflow of the liquid stops as the pressing stops, so the pouring amount can be easily adjusted)
・ Good: ○ (Soy sauce comes out with a slight press. Care must be taken when the liquid comes out too much.)
-Lower limit: △ (Slightly strong pressing is required, but soy sauce comes out. It is an acceptable range.)
・ Bad: × (Slight press does not produce soy sauce or requires a large press)

<Test series 1-3>
As shown in FIG. 1, a rectangular strip-shaped first welded out portion is formed in the longitudinal sealing portion of the test storage bag with a heat welding tool, and then the rectangular strip-shaped second is also formed in the lateral sealing portion. A welded and protruded portion was formed.
In the following test series 1 to 3, the pouring passage inlet diameter (di) is 5.0 mm, and the pouring passage diameter is from the pouring passage inlet (71) to the pouring passage outlet (72). (d) is constant. Furthermore, while extending in the housing portion (2) and the second weld protruding portion (11) point on the boundary line demarcating the (Q) is a second push-out start point (Q1) from the second push-out deepest point (Q2) The distance (H) between the point (Q) and the vertical sealing portion peripheral line (41L) is constant. Further, since the vertical sealing portion and the horizontal sealing portion are orthogonal to each other, the requirement (2) to be satisfied is “(L2 / D1) is 1.0 or more and 3.5 or less”.
In the test series 1, a series of tests were performed by changing the depth (D1) of the first weld protrusion. At this time, the distance (D3) between the first projecting deepest point (P2) and the second projecting deepest point (Q2) and the depth (D2) of the second welded projecting part are not changed. The results are shown in Table 1 (Examples 1 to 4, Comparative Example 1, and Comparative Example 10).
In the test series 2, the test was performed by changing the position of the second protruding start point with the first welding protruding portion being the same as that of the series 1 embodiment 1. At this time, the depth (D2) of the second weld protrusion is not changed. The results are shown in Table 1 (Example 1, Example 5, Comparative Example 2, Comparative Example 3).
In the test series 3, the test was performed by changing the depth of the second welded and projecting portion by changing the depth of the second welded and projecting portion to the same as that of the first embodiment. At this time, the position of the second protruding start point is not changed. The results are shown in Table 1 (Example 1, Examples 6 to 8, Comparative Example 4, and Comparative Example 5).

[Example 9]
A first welded projecting portion and a second welded projecting portion were formed in the same manner as in Example 1 except that the folded film portion of the test soy sauce containing sachet was used as a vertically sealed portion (FIG. 11).
Compared with Example 1, the accumulation of liquid near the outlet of the pouring passage increased, but the degree of fullness of the liquid throughout the pouring passage was almost the same, and the hand was not soiled by the opening operation. The pouring controllability was as good as in Example 1.

[Comparative Example 6]
A first welded projecting portion and a second welded projecting portion were formed in the same manner as in Example 1 except that the film folded portion of the test soy sauce containing sachet was used as a laterally sealed portion (FIG. 12).
The pouring passage was filled with liquid, and the hands were soiled by the opening operation.
Even if the pouring passage entrance diameter was narrowed, there was no change in the situation. When the side sealing part was made to be a folded film, it was considered that a force to widen the pouring passage acted from the residual stress of the folded film portion, and as a result, the pouring passage was easily filled with liquid. .

[Test Series 4]
In Example 1 of the test series 1, the first welded projecting portion was made in the same manner (di = 5.0 mm, D1 = 5.0 mm), and the second welded projecting portion was shaped to project into a trapezoidal shape on the storage unit side (see FIG. 13, the vertical sealing portion 41 and the horizontal sealing portion 42 are not shown in the drawing). In FIG. 13, the angle (inner angle) formed by the line segment Q2Q1 and the line segment Q1Q3 is 45 degrees. In addition, while the point (Q) reaches the second protruding end point (Q2) from the second protruding start point (Q1), the distance (H) between the point (Q) and the vertical sealing portion peripheral line (41L) Is a monotonous increase.
In this test series, under these conditions, the second protruding start point (Q1) is moved to Q1 '' through Q1 'and the second welded protruding portion has its shape and area. As it was, it was moved in parallel along the peripheral sealing portion peripheral line (42L). Here, the length of OQ1 is 5.0 mm, the length of OQ ′ is 7.5 mm, and the length of OQ1 ″ is 10.0 mm. Note that the line segment Q1'Q2 'is substantially in contact with a virtual arc whose center is the point P2 and whose radius is equal to the length of di at the point Q0. That is, when the point Q on the line segment Q1′Q2 ′ moves from Q1 ′ toward Q2 ′, the length of the line segment QP2 is always larger than the pouring passage entrance diameter (di).
On the other hand, when the point Q on the line segment Q1Q2 moves from Q1 toward Q2, the length (r) of the line segment QP2 is the pouring passage entrance diameter (di) except when the point Q is Q1 or Q2. Smaller.
The test results are shown in Table 2 (Examples 10, 11, 12, [Table 2]).
As compared with Examples 10, 11, and 12, Examples 11 and 12 that satisfy the “additional requirement (3) ′” described above can pour out liquid with less pressure than Example 10 that does not. It was.

[Test Series 5]
In Example 1 of Test Series 1, the same was applied to the first welding and protruding portion, and the second welding and protruding portion was subjected to a series of tests such that the boundary line with the pouring portion was an arc shape ( [Table 3] In FIG. 8 and FIG. 8, the vertical sealing portion 41 and the horizontal sealing portion 42 are not shown. Here, the distance (L2) from the vertical / horizontal sealing portion peripheral line intersection (O) to the second protruding start point (Q1) is equal to the depth (D1) of the first welding protruding portion, and The arc is formed so as to be a part of a circle having the point (P2) as the center and the line segment (P2Q1) as the radius. However, after the depth of the second protruding portion (D2) exceeds the size of the pouring passage inlet diameter (di), the boundary line is the deepest point (Q2) of the second protruding portion is the vertical sealing portion. It is formed so as to be parallel to the peripheral line (41L).
In this test series, D1 / di is fixed to 1.0, L2 / D1 is fixed to 1.0, and D3 / di is fixed to 1.0. In this test series, while the point (Q) reaches from Q1 to Q2, the distance (H) between the point (Q) and the vertical sealing part peripheral line (41L) is monotonically increasing, and P2 and Q2 The ratio of the distance between and the pouring passage inlet diameter (di) is 1.0 or more.
As a result of a series of tests under the above conditions, the ratio (D2 / di) of the second protruding portion depth (D2) to the pouring passage inlet diameter (di) was 0.6 (Comparative Example 7). However, when the ratio (D2 / di) is set to 0.8, the low passage fullness is abruptly improved (Example 13). When the value of D2 / di is in the range of 1.0 (Example 13) to 1.4 (Example 14), it is possible to obtain a well-balanced passage fullness, non-leakage, and pouring controllability. When the value of D2 / di is 3.0 (Comparative Example 8), large pressing is required for pouring, and the pouring controllability is poor.

[Test Series 6]
In Example 14 of Test Series 5, the positions of the second protrusion start point (Q1), the second protrusion end point (Q3), and the depth (D2) of the second welded protrusion are fixed, and the first The test was performed by changing the distance (D3) between the protruding deepest point (P2) and the second protruding deepest point (Q2) to 3.0 mm (Comparative Example 9) and 8.0 mm (Example 15). (In [Table 4], FIG. 14, and FIG. 14, the vertical sealing portion 41 and the horizontal sealing portion 42 are not shown). At this time, the curve connecting Q1Q2 is an upwardly convex elliptical arc, and the elliptical arc is in contact with the lateral sealing portion peripheral line (42L) at the position of Q1.
In this test series, while the point (Q) is from Q1 to Q2, the distance between the point (Q) and the vertical sealing part peripheral line (41L) is monotonically increasing, and the second welded part The ratio of depth (D2) to pouring channel inlet diameter (di) is 1.0.
Since the comparative example 9 does not satisfy the requirement (3), a bottleneck is formed between the storage portion (2) and the extraction passage (7), which is inferior in the pouring controllability than the embodiment 14 (large Need to be pressed).

[Example 16]
In Example 1, the shape of the 1st 1st welding protrusion part and the 2nd welding protrusion part was made into the V shape like FIG. 5 (FIG. 5). Here, the triangles whose vertices are the points P1, P2, and P3 are isosceles triangles whose equilateral sides are the line segments P1P2 and P3P2, and similarly, the triangles whose vertices are the points Q1, Q2, and Q3 are the segment Q1Q2 And isosceles triangles with equilateral sides Q3Q2.
In addition, the pouring passage inlet diameter (di) is 5.0 mm, the pouring passage outlet (do) is 4.0 mm, the depth (D1) of the first welded out portion is 5.0 mm, and the vertical and horizontal sealing portions. The length of the line segment OQ1 connecting the peripheral line intersection (O) and the second protruding start point (Q1) is 10.0 mm, and the depth (D2) of the second welded protruding portion is 5.0 mm. The soy sauce storage sachet obtained in this way showed a passage portion low filling property, non-leakage property, and pouring property equivalent to those in Example 1.

[Example 17]
In Example 1, the shape of the 1st 1st welding protrusion part and the 2nd welding protrusion part was made into the U-shaped thing like FIG. 6 (FIG. 6).
The pouring passage inlet diameter (di) is 7.0 mm, the pouring passage outlet (do) is 5.0 mm, the depth (D1) of the first welded out portion is 7.0 mm, and the vertical and horizontal sealing portions The length of the line segment OQ1 connecting the peripheral line intersection (O) and the second protruding start point (Q1) is 14.0 mm, and the depth (D2) of the second welded protruding portion is 7.0 mm. The soy sauce storage sachet obtained in this way showed a passage portion low filling property, non-leakage property, and pouring property equivalent to those in Example 1.

[Example 18]
A parallelogram shaped soy sauce storage bag as shown in FIG. 2 was prepared.
The length and distance of each part are as follows.
θ: 75 degrees Length of vertical sealing portion and horizontal sealing portion (accommodation side peripheral line portion): 40 mm
The shape of the first welding protrusion and the second welding protrusion: U-shape
di: 7mm
do: 5mm
D1: 10 mm
L2: 15mm
D2: 10mm
The soy sauce storage bag described above had a low liquid filling level, excellent non-leakage properties, and good pouring controllability.

[Test example]
In order to confirm the effect of the present invention on a large pouch bag, a rectangular bag was prepared by welding and sealing a polyethylene film with a thickness of 100 μm in a length of 23 cm and a width of 12 cm on three sides, and this bag was filled with water. Finally, a water storage pouch bag (bag A) was created by welding the lateral sealing portion. The storage is not filled with air. Next, a water storage pouch bag (bag B) in which only the first welding and protruding portion was formed by welding and a water storage pouch bag (bag C) in which a second welding and protruding portion was further formed were prepared.
In addition, the length of each part is as follows.
Pour passage diameter: 13mm (constant)
The length of the pouring passage, the depth of the first welding and protruding portion: 13 mm
Distance from the peripheral line intersection to the second weld protrusion start point: 27 mm
Depth of second weld protrusion: 13mm
The pouring passage portion of the water storage bag thus prepared was cut and placed in a state where it was tilted horizontally, and its non-leakage property was observed. The results are as follows, and the effect of the present invention was confirmed.
Bag A: A large amount of water spilled out.
Bag B: A small amount of water spilled out.
Bag C: Only a small amount of water spilled.

1． Liquid storage bag
2． Storage
3． Liquid
Four. Sealed part, sealed part by welding, sealed part by folding
41. Vertical seal
41L. Storage part side peripheral line of vertical sealing part 41, vertical sealing part peripheral line
41 '. Other vertical sealing part opposite to the vertical sealing part 41
41L '. Storage part side peripheral line of the vertical sealing part 41 '
42. Horizontal sealing part
42L. Storage part side peripheral line of horizontal sealing part 42, horizontal sealing part peripheral line
42 '. Other horizontal sealing part opposite to the horizontal sealing part 42
42L '. Storage part side peripheral line of the lateral sealing part 42 '
6． Pouring part
7． Pouring passage
71. Pour passage entrance
72. Pour passage exit
Ten. 1st welding protrusion
P1. Start point of the first welding protrusion, first protrusion starting point
P2. The deepest point of the first welding protrusion, the first protrusion deepest point
P3. End point of the first welding and protruding part, first protruding point
P2h. Point perpendicular to the peripheral sealing edge from the first projecting deepest point
11． Second weld protrusion
Q1. Start point of the second welding protrusion, second protrusion starting point
Q2. The deepest point of the second weld protrusion, the second protrusion deepest point
Q3. End point of the second welding protrusion, second protrusion end point
Q. A point on the boundary line demarcating the housing portion and a second weld overhang portion
H. Distance between point Q and vertical seal edge
O. Intersection of vertical sealing part peripheral line and horizontal sealing part peripheral line, vertical / horizontal sealing part peripheral line intersection
d. Pour passage diameter
di. Pour passage diameter
do. Pour passage exit diameter
D1. Depth of first weld protrusion
D2. Depth of second weld protrusion
D3. Distance between first deepest point (P2) and second deepest point (Q2)
r. Distance between point (Q) and point P2
L1. Length of line segment OP1
L2. Length θ of line segment OQ1. Intersection angle between the vertical sealing part peripheral line and the horizontal sealing part peripheral line, peripheral line intersection angle

Claims (10)

A liquid storage bag (1) in which a liquid is stored in a storage portion (2) formed by welding two stacked films,
The storage part (2)
A linear longitudinal sealing part by welding or a linear longitudinal sealing part by film folding (41) ;
The vertical sealing portion (41) and a linear strip-shaped horizontal sealing portion (42) by welding substantially orthogonal to each other,
The vertical sealing portion (41) includes a first welding and protruding portion (10) protruding to the storage portion side,
The lateral sealing portion (42) includes a second welding and protruding portion (11) protruding to the storage portion side,
The first welding and protruding portion (10) and the second welding and protruding portion (11 ) together with the vertical sealing portion (41) and the lateral sealing portion (42) define a pouring portion (6) . And
Further, the pouring part (6) is provided with a pouring passageway (7) defined by the lateral sealing part (42) and the first welding and projecting part (10) at the tip thereof,
The pouring passage diameter (d) is constant or monotonously decreased from the pouring passage (7) inlet to the pouring passage (7) outlet,
The ratio (D1 / di) of the depth (D1) of the first welded projecting portion (10) to the pouring passageway (7) inlet diameter (di) is 0.5 or more and 3.0 or less,
The length (L2) of the line segment connecting the intersection (O) between the vertical sealing portion peripheral line (41L) and the horizontal sealing portion peripheral line (42L) and the second weld protrusion start point is The ratio (L2 * sinθ / D1) of the value obtained by multiplying the sine ratio of the intersecting angle (θ) of the sealing portion peripheral line and the lateral sealing portion peripheral line to the depth (D1) of the first welded protrusion portion is 1.0 to 3.5,
Protruding the second welding from the start point (Q1) of said housing portion (2) and the second weld protruding portion (11) point on the boundary line demarcating the (Q) is the second weld protruding portion (11) When reaching the deepest point (Q2) of the part (11)
i) The distance (H) between the point (Q) and the vertical sealing portion peripheral line (41L ) is constant or monotonically increasing,
ii) the first deepest point of the weld the protruding portion (10) (P2) and said second welding protruding portion deepest point (11) of the (Q2) the distance between (D3), the pouring passage inlet The ratio to the caliber (di) is 1.0 or more,
The ratio (D2 / di) of the depth (D2) of the second welding and projecting portion (11) to the pouring passage inlet diameter (di) is 0.8 or more and 2.0 or less. Liquid storage bag to be used. Said second weld protruding portion depth (11) of the (D2), ratio of passing path inlet diameter (di) pouring the (D2 / di), the liquid of claim 1 is 1.5 or less Goods storage bag. 3. The liquid state according to claim 1, wherein a ratio (D1 / di) of the depth (D1) of the first welded projecting portion (10) to the pouring passage inlet diameter (di) is 2.0 or less. Goods storage bag. Protruding the second welding from the start point (Q1) of said housing portion (2) and the second weld protruding portion (11) point on the boundary line demarcating the (Q) is the second weld protruding portion (11) When reaching the deepest point (Q2 ) of the part (11), the length (r) of the line segment connecting the point (Q) and the deepest point (P2) of the first welded out part is always the diameter of the pouring passage inlet The liquid storage bag according to any one of claims 1 to 3, which is (di) or more. The end point (P3) of the first welding and projecting portion (10) is on the vertical sealing portion peripheral line (41L) , and the end point (Q3) of the second welding and projecting portion (11 ) is the lateral sealing. The liquid storage bag according to any one of claims 1 to 4, which is on the peripheral edge line (42L) . The liquid material storage bag according to any one of claims 1 to 5, wherein the vertical sealing portion (41) and the horizontal sealing portion (42) are orthogonal to each other. The liquid pouring bag according to any one of claims 1 to 6, wherein the pouring passage diameter (d) is constant from the pouring passage inlet to the pouring passage outlet. The liquid pouring bag according to any one of claims 1 to 6, wherein the pouring passage has a tapered shape that tapers from the pouring passage inlet toward the pouring passage outlet. The liquid material storage bag according to any one of claims 1 to 8, wherein the pouring passage diameter is in a range of 2 to 15 mm. The liquid material according to claim 1, wherein the pour-out passage diameter is in a range of 10 to 30 mm.