JP2023084339A - Splicing film and film for filling packaging machine therewith - Google Patents

Abstract

To provide a splicing film that does not cause leakage of a content when a seam where a tail portion of preceding film and a tip end of a following film are each other butted is placed, without using a special film splicing device or machine, can maintain and fix and a bag is made at a slicing portion.SOLUTION: A splicing film for joining a tail end of a preceding film and a leading end of a trailing film by covering a seam portion where the end of the preceding film and the leading end of the trailing film are butted against each other and heat-welding them, wherein the slicing film has at least a first heat seal layer, and the first heat seal layer is heat-sealed to the tail end portion and the tip end portion so as to be joined together. and wherein the first heat seal layer is partially provided with an adhesive.SELECTED DRAWING: Figure 1

Description

The present invention relates to a splicing film for joining together the trailing edge of a leading film and the leading edge of a trailing film.

Many of the films for filling and packaging machines that are used to continuously or intermittently fill and package liquids, powders, etc. by automatic filling and packaging machines pass through printing, laminating, slitting, etc. , 2000 m, etc., and supplied to the automatic filling and packaging machine in a wound state (original roll).

However, in the process of manufacturing the film for filling and packaging machines, if there is a printing defect or lamination defect, etc., that part may be cut off and the film will be shorter than the predetermined length specified by the customer. Sometimes I end up
In order to provide customers with films of a predetermined length, adhesive tapes such as cellophane tape are generally used to make up for the shortfall by joining other films.

In the method of joining films using adhesive tape, first, the trailing end of a film that has not reached a predetermined length (hereinafter referred to as the preceding film) and the leading end of a film that compensates for the shortfall (following film) are attached. butt each other. Next, by sticking an adhesive tape so as to cover it along the seam of the butted leading and trailing films, joining becomes possible.

However, when a film for filling and packaging machines bonded with an adhesive tape is used, there is a problem that the content leaks when a packaging bag is made by filling a liquid, powder, or the like. This is because in the process of folding the leading and trailing films in two in the width direction and heat-sealing them in the vertical and horizontal directions to make a bag (hereinafter referred to as the bag-making process), the adhesive tape joints are not sufficient. This is because heat sealing is not performed properly. Therefore, the machine must be stopped when the joined portion is made into a bag, which imposes a burden on the operator. In addition, film loss, content loss, time loss, etc. occurred.

In order to solve the above problems, in Patent Document 1, a splicing tape made of a double-sided sealable laminate film comprising a substrate layer, a colored intermediate layer, and a heat-sealing layer is separated from the trailing end of the preceding film and the leading end of the following film. A method is disclosed in which the part is placed on the seam and heat-sealed with a pressing plate and an impulse sealer.

JP 2009-154427

However, in the method of Patent Document 1, a splicing tape made of an elongated double-sided sealing laminate film is attached along the seam between the trailing end of the preceding film and the leading end of the trailing film. It was difficult to place and maintain the seams aligned with the tip of the tape, and there was a possibility that the seaming tape would be displaced from the predetermined position even in the process of heat-sealing with the pressing plate and the impulse sealer. In this way, if the splicing tape is spliced off the joint, the content may leak after filling, which may contaminate the work site or the machine.

Therefore, according to the present invention, the trailing edge of the leading film and the trailing edge of the trailing film can be easily placed on the butted seams and maintained and fixed without using a special film splicing device or machine. It is therefore an object of the present invention to propose a spliced film that prevents contents from leaking when a bag is made at the spliced portion.

When the spliced film is placed on the seam where the tail end of the preceding film and the leading end of the succeeding film are butted against each other so as to be positioned outside the bag made in the bag making process, and the seam is covered, the contents The material leaks out of the bag and the seams cannot be reliably sealed. Therefore, in order to place the spliced film so as to be positioned inside the bag made in the bag-making process and to maintain a state in which the seams are reliably covered, the inventors first determined the heat seal layer of the spliced film. An adhesive is provided on the entire surface (the surface in contact with the leading and trailing films) so that it can be fixed while being placed on the leading and trailing films. However, when the seam film having the adhesive applied over the entire surface is placed on the leading and trailing films and heat-sealed, the heat-sealing layer is hindered by the adhesive, and heat welding around the seam cannot be performed. The contents leaked from the seam.

Therefore, by partially providing an adhesive on the surface of the heat seal layer of the splicing film (the surface in contact with the leading and trailing films), the adhesive part maintains the state of being placed on the leading and trailing films. In addition to heat-sealing the heat-sealing layer where the adhesive is not provided and where the heat-sealing layer is exposed, the content does not leak from the location where the splicing film is provided. reached.
That is, according to the present invention, as a means for solving the above problems,
(a) A seam for joining the tail end of the leading film and the leading end of the trailing film by covering the seam portion where the leading end of the preceding film and the leading end of the trailing film are butted against each other and heat-welding the tail end and the leading end. A spliced film is provided, wherein the spliced film has at least a first heat-sealing layer, and the first heat-sealing layer is partially provided with an adhesive. is,
(B) The spliced film of (A) is provided, wherein the pressure-sensitive adhesive is provided in a dot pattern on the surface of the first heat seal layer,
(C) The joint of (A), wherein an adhesive is intermittently provided on the surface of the first heat seal layer along the width direction end of the first heat seal layer. A film is provided.

(d) The adhesive is provided so as to be symmetrical with respect to a straight line extending in the longitudinal direction through the center point of the surface of the first heat seal layer, and has the following (1); The spliced film of (a) characterized by satisfying the conditions of (2) or (3) is provided,
(1) A pressure-sensitive adhesive is not provided in areas ranging from 0 to 5% and 95 to 100% from one longitudinal end of the first heat seal layer toward the other end.
(2) A pressure-sensitive adhesive is not provided in an area ranging from 0 to 5% from one end in the width direction of the first heat seal layer toward the other end.
(3) A pressure-sensitive adhesive is not provided in a range of 0 to 5% from the straight line toward the widthwise end of the first heat seal layer.
(E) The spliced film of (A), characterized in that the adhesive is intermittently provided on a straight line extending in the longitudinal direction that passes through the center point of the surface of the first heat seal layer. provided,
(f) the adhesive is provided so as to be point symmetrical with respect to the center point of the surface of the first heat seal layer, and has the following (1′), and (2′) or (3 ') A spliced film characterized by satisfying the conditions of (a) is provided,
(1′) A pressure-sensitive adhesive is not provided in areas of 0 to 5% and 95 to 100% from one longitudinal end of the first heat seal layer toward the other end.
(2') A pressure-sensitive adhesive is not provided in a range of 0 to 5% from one end in the width direction of the first heat seal layer toward the other end.
(3′) from a straight line passing through the center of the surface of the first heat-sealing layer and extending in the length direction toward the end in the width direction of the first heat-sealing layer in the range of 0 to 5% The areas are not provided with adhesive.
(G) The spliced film according to any one of (A) to (F), wherein the pressure-sensitive adhesive is provided in 5 to 50% of the surface area of the first heat seal layer. provided,
(H) The spliced film according to any one of (A) to (G), wherein the adhesive has a thickness of 1 to 100 μm,
(i) The spliced film according to any one of (a) to (h), characterized in that the spliced film comprises the first heat-sealing layer and a base layer,
(J) The splice film comprises the first heat-sealing layer, the substrate layer, and the second heat-sealing layer in this order, and the adhesive is provided only on the first heat-sealing layer. A spliced film described in (ix) is provided,
(x) The patched film according to (ix) or (x), wherein the base material layer contains polyethylene terephthalate as a main component,
(vi) A film for a filling and packaging machine is provided, wherein the leading film and the trailing film are joined by the splicing film according to any one of (a) to (c),
(H) The film for a filling and packaging machine according to (H), which is for filling liquids, is provided,
(x) The film for filling and packaging machines according to (x) is provided, which is used for filling granular powders.

When the splice film of the present invention is used, the tail end portion of the leading film and the trailing film are separated by the adhesive provided in the heat-sealing layer (hereinafter abbreviated as the first heat-sealing layer) partially provided with the adhesive. It can be fixed in a state of being placed along the seam with the tip of the . In addition, the preceding film and the succeeding film are heat-sealed at the exposed portion of the heat-seal layer where the adhesive is not provided, so that these can be reliably welded and joined, and the bag-making process Vertical sealing and horizontal sealing can be reliably performed. As a result, the splicing tape can be reliably spliced along the seam without using a special film splicing device or machine, and even when filled and packaged with a film having a spliced portion, leakage of the contents can be reliably prevented. Filling work can be performed without contaminating the work site or the machine.

(a) is a schematic plan view showing an embodiment when a splicing film is thermally welded to a leading film and a trailing film according to the present invention. (b) is a cross-sectional view of the embodiment, and (c) is an enlarged view of a joint portion of (b). FIG. 2 is a schematic plan view showing a state in which the film for a filling and packaging machine according to the present invention is bag-manufactured through a bag-manufacturing process. 1(a) is a schematic plan view showing an embodiment of a splice film according to the present invention, (b) is a perspective view of (a), and (c) is a cross-sectional view of (a). 4A and 4B are schematic plan views showing modifications of the splice film shown in FIG. 3; FIG. (a) and (b) are schematic plan views showing another embodiment of the spliced film according to the present invention. (a), (b), (c), (d) and (e) are schematic plan views showing another embodiment of the splice film according to the present invention. (a), (b) and (c) are schematic plan views showing another embodiment of the patch film according to the present invention.

The present invention will be described in detail below. It should be noted that the present invention is not limited to the following embodiments, and can take various forms within the scope of the effects of the present invention.

FIG. 1 shows an embodiment of a structure in which a leading film 3 and a trailing film 4 are joined with a splicing film 6 according to the present invention. FIG. 1(a) is a plan view of the splicing film 6 which is heat-sealed to the leading film 3 and trailing film 4. FIG. FIG. 1(b) is a cross-sectional view showing the joining structure when the joining film 6 is heat-sealed to the leading film 3 and the trailing film 4, and FIG. 1(c) shows the joining portion of FIG. 1(b). It is an enlarged view.
In the specification of the present application, "placing" indicates a state in which the seam 5 between the leading film 3 and the trailing film 4 is covered with the spliced film 6, and refers to a state before heat sealing.
By arranging the seam film 6 on the innermost side of the manufactured bag, the seam 5 can be reliably sealed from the inside of the bag, and the filled contents are prevented from leaking out from the inside of the bag. have.

As shown in FIG. 1, the splicing film 6 is placed so as to cover the seam 5 where the trailing end of the leading film 3 and the leading end of the trailing film 4 are butted against each other, and the splicing film 6 is first heat-sealed. By heat-sealing layer 1, leading film 3 and trailing film 4 can be joined. The spliced film 6 shown in FIG. 1 includes a second heat seal layer 2 which sandwiches the base material layer 14 and which is not provided with the pressure-sensitive adhesive 7 as the outer layer.
The heat welding means for welding the preceding film 3 and the succeeding film 4 with the splicing film 6 is not particularly limited, and may be a dedicated heat sealing device, an impulse sealer device, or a handy impulse sealer. can be

As shown in FIG. 1, the film 11 for a filling and packaging machine becomes a continuous packaging bag as shown in FIG. 2 through a bag-making process. The continuous packaging bag 15 can be used as a bag for containing contents such as liquids and powders, and has the effect of preventing the contents from leaking even if a bag using a joint is used.

The present invention is characterized in that an adhesive 7 is partially provided on the first heat seal layer 1 of the patch film 6 as shown in FIG. 1(c). By partially providing the adhesive 7 on the first heat seal layer 1 in this manner, the splice film 6 can be reliably fixed in a state of being placed along the seam 5, and the first heat seal layer 1 can be fixed. The leading film 3 and the trailing film 4 can be joined without shifting the position of the splicing film 6 even in the step of heat-sealing the sealing layer 1 .
In addition, the first heat seal layer 1 is exposed to the surface at locations where the adhesive 7 is not provided. Therefore, even if the adhesive 7 inhibits the heat-sealing property of the first heat-sealing layer 1, the first heat-sealing layer 1 where the adhesive 7 is not provided is exposed to the surface, and the splicing film can be removed. 6 can be reliably heat-sealed to the surfaces of the leading film 3 and the trailing film 4, and the seam 5 can be reliably sealed, so that leakage of the contents can be prevented. Therefore, the spliced film 6 of the present invention is preferably used as a packaging film for filling, such as a film for filling a liquid substance or a packaging film for filling powder or grain.

The spliced film 6 of the present invention is formed in the form of a long winding tape, and is paid out at the time of use and cut to the required length. It is possible to provide a slit that has a similar shape, and to have a form that becomes a strip when separated from the large-sized sheet, but it is not limited to this, and other suitable forms can be taken by those skilled in the art. can be done.

The width of the splice film 6 is preferably 10 mm to 30 mm, more preferably 10 mm to 15 mm. If the width of the seam film 6 is less than 10 mm, it is difficult to partially apply the adhesive 7, and it is difficult to reliably cover the seam 5, which is not preferable. On the other hand, if the width of the splicing film 6 exceeds 30 mm, the joining area between the leading film 3 and the trailing film 4 increases, so the joining strength increases. It is not preferable because the handleability is deteriorated, such as formation of particles.

The length of the splicing film 6 may be appropriately adjusted according to the widths of the leading film 3 and trailing film 4, and is not particularly limited, but for example, it may have the same width as the leading film 3 and trailing film 4. Also, it is preferable to make the width of the leading film 3 and the trailing film 4 longer by 1 to 10 mm so that the operator can easily recognize the spliced portion.

The spliced film 6 is provided with the first heat-sealing layer 1 at least partially provided with the adhesive 7, and even if it is a single-layer film consisting only of the first heat-sealing layer 1, the first heat-sealing layer 1 A multilayer film having the seal layer 1 as a surface layer may also be used.
As a material for the first heat seal layer 1, a material that can be thermally welded is preferable. For example, it is preferable to use polyolefins such as polyethylene and polypropylene, ethylene vinyl acetate copolymers, ethylene ethyl acrylate copolymers, ethylene acrylic acid copolymers, ethylene methyl methacrylic acid copolymers, ionomers, and the like.
Furthermore, if the first heat-seal layer 1 is made of the same resin as the heat-seal layers of the preceding film 3 and the succeeding film 4, the bonding strength is increased, so it is particularly preferable.

Further, a substrate layer 14 may be provided in addition to the first heat seal layer 1 . As a material for the base material layer 14, it is preferable to use polyethylene terephthalate, polyamide, polypropylene, aluminum-deposited polyethylene terephthalate, silica-deposited polyethylene terephthalate, alumina-deposited polyethylene terephthalate, or the like. Among these, biaxially oriented polyethylene terephthalate is particularly preferable because it has excellent heat resistance and hardly undergoes dimensional change.

Further, the base material layer 14 may contain a coloring agent, or may be printed with patterns, characters, etc., and those skilled in the art can take appropriate forms for the printed pattern.
Patterns and characters may be printed on both sides of the base material layer 14, or may be printed on only one side of the base material layer 14, but preferably printed on only one side. .
As for the printing of patterns and characters, it is preferable to print the left-right asymmetric patterns and characters so that the front and back can be clearly identified so that the operator can easily determine which side the adhesive 7 is provided on. . For example, when a symmetrical letter "A" is printed on the splicing film 6, the letter "A" can be read from both the front side and the back side. In other words, it is difficult to determine which side the adhesive 7 is on by looking at the letter, so a symmetrical letter such as "A" is not preferable.

Moreover, the color of the splicing film 6 is preferably a color that makes it easy to identify the splicing film 6 when the splicing film 6 is adhered to the leading film 3 and the trailing film 4 . In addition, the splicing film 6 has a color different from that of the leading film 3 and the trailing film 4, and has a color (for example, red or blue) that can be easily detected by a sensor or the like so that the bag formed at the spliced portion can be automatically discharged. is particularly preferred.

Moreover, when the splice film 6 is a multilayer film having the substrate layer 14, the splice film 6 should have the first heat-seal layer 1 and the second heat-seal layer 2 on both outer layers of the substrate layer 14. is preferred. This is because the filling and packaging machine film 11 is folded in half in the bag making process so that the splicing film 6 is on the inside of the bag, and is heat-sealed in the vertical and horizontal directions while filling the contents. This is because sealing and lateral sealing can be reliably performed.

FIG. 3 shows an embodiment of the splice film 6 partially provided with the adhesive 7 .
FIG. 3(a) is a plan view of the splice film 6 with the first heat seal layer 1 side facing upward, FIG. 3(b) is a slant view of the splice film 6, and FIG. ) is a cross-sectional view taken along line XX' of the oblique view of the splice film 6 shown in FIG. 3(a).
The width direction of the splice film 6 (first heat seal layer 1) and the length direction of the splice film 6 (first heat seal layer 1) shown in FIG. 3 are the same directions in FIGS. 4 to 8 as well.

FIG. 3 shows an embodiment when the adhesive 7 is provided on the first heat seal layer 1 in a dot pattern.
At this time, the dot pattern is provided in a state in which the splicing film 6 is widely scattered throughout. The size of the circle of the dot pattern is preferably smaller than the heat sealing width in the bag making process, and as a specific value, it is preferably 1 to 40% of the heat sealing width, and 20% of the heat sealing width. A value of ~40% is even more preferred. By widely scattering the dot pattern of the adhesive 7 on the whole splicing film 6, the splicing film 6 does not float from the leading film 3 and the trailing film 4, and the splicing film 6 is uniformly attached to the leading film 3 and the trailing film. It can be placed on the film 4 and the heat sealing work can be done efficiently even by one person.
Moreover, when the adhesive 7 is provided in a dot pattern, the circle does not need to be a perfect circle, and may be a rough circle such as an ellipse. Furthermore, other than the circle, a person skilled in the art may take any suitable shape such as a square or a triangle. Good, you can think of a variety of patterns.

The pattern when the adhesive 7 is partially provided on the first heat-seal layer 1 of the splicing film 6 can take various forms, and a person skilled in the art can make it into an appropriate form. FIG. 4 shows a plan view of another embodiment.
The dot pattern in FIG. 4A is arranged at equal intervals in the length direction of the first heat seal layer 1 and arranged side by side at both ends of the splice film 6 in the width direction. By arranging in this way, it is possible to fix the splicing film 6 while placing it on the leading film 3 and the trailing film 4 while reducing the area where the adhesive 7 is provided. work efficiently. Furthermore, as shown in FIG. 4B, a random dot pattern may be used. Note that the dot pattern is not limited to the pattern described above, and a person skilled in the art may take any appropriate form.

FIG. 5 is a plan view showing another embodiment of the splicing film 6 partially provided with the adhesive 7. FIG. As shown in FIG. 5, the adhesive 7 is provided intermittently along both ends of the splicing film 6 in the width direction. ), the adhesive 7 is not provided. Therefore, the adhesive 7 is provided in such a manner that the exposed first heat seal layer 1 is sufficiently heat-sealed with the leading film 3 and trailing film 4 at the joint 5 .
In addition, the term "intermittent" in this specification indicates that the adhesive 7 is provided discontinuously from one end of the spliced film 6 toward the other end, and a person skilled in the art can You can get the right pattern.
The intermittently provided adhesive 7 can be formed into an appropriate pattern by those skilled in the art. It is preferable that each pattern of the agent 7 has the same pattern. In this manner, when slitting the spliced film 6 of the long and large sheets, it is possible to confirm whether or not the slit position is accurate by comparing the shapes of the adhesives 7 of the two spliced films 6 split by slitting. can be done.
In addition, the size of each intermittently provided pattern is preferably smaller than the heat-sealing width in the bag-making process, and a specific value is 5 to 40% of the heat-sealing width. is preferred, and a value of 20 to 40% of the heat seal width is more preferred.

FIG. 6 is a plan view showing still another embodiment of the splice film 6 partially provided with the adhesive 7. FIG. As shown in FIG. 6, the adhesive 7 is provided so as to be symmetrical with respect to a straight line 10 extending in the longitudinal direction through a point 13 at the center of the surface of the first heat seal layer 1. The pressure-sensitive adhesive 7 can be provided in such a manner as to provide (1) and satisfy the conditions (2) or (3).
(1) The pressure-sensitive adhesive 7 is not provided in areas ranging from 0 to 5% and 95 to 100% from one longitudinal end of the first heat seal layer 1 to the other end.
(2) The pressure-sensitive adhesive 7 is not provided in a range of 0 to 5% from one widthwise end of the first heat seal layer 1 toward the other end.
(3) A range of 0 to 5% from the straight line 10 extending in the length direction along the center point 13 of the surface of the first heat seal layer 1 toward the end in the width direction of the first heat seal layer 1 The area is not provided with adhesive 7 .
In addition, the requirement of (1) is defined as 100% when the first heat-seal layer 1 reaches from one end in the length direction to the other end. In addition, as shown in the requirement (1), the adhesive 7 is provided in the areas of 0 to 5% and 95 to 100% inward from the ends in the length direction of the first heat seal layer 1. preferably not According to the requirement (1), since there is no adhesive 7 in the region 12 where the vertical heat-sealed portions 8 overlap, heat sealing can be performed without hindrance by the adhesive, and the filling and packaging machine film 11 in the region 12 The heat sealing of the spliced film 6 can be strengthened.
The region where the adhesive 7 is not provided is preferably a region in the range of 0 to 20% and 80 to 100% inward from the end in the length direction of the first heat seal layer 1, particularly 0 to 100%. Areas in the range of 25% and 75-100%, more preferably in the range of 0-45% and 55-100% are preferred. The range in which the adhesive 7 is not provided is not limited to this, and a person skilled in the art can take an appropriate range as appropriate.
On the other hand, if the area where the adhesive 7 is provided is small, it becomes difficult to keep the splicing film 6 placed on the leading film 3 and trailing film 4 . For this reason, it is preferable that the adhesive 7 is provided in a wide area up to near the boundary of the vertical heat-sealed portion 8 in a range that does not overlap with the vertical heat-sealed portion 8 in FIG.
Furthermore, the requirement (2) defines 100% when the splice film 6 reaches from one end in the width direction to the other end. In addition, as shown in the requirement (2), it is preferable that the pressure-sensitive adhesive 7 is not provided in a range of 0 to 5% inwardly from the end of the splice film 6 in the width direction. According to the requirement (2), since there is no adhesive 7 in the vicinity of both ends in the width direction of the splice film 6, strong heat sealing can be performed without hindrance by the adhesive. As a result, the liquid filled in the bag can be prevented from entering the gap between the spliced film 6 and the film 11 for filling and packaging machines from the widthwise end of the spliced film 6 .
The region where the adhesive 7 is not provided is preferably a region in the range of 0 to 20%, particularly 0 to 30%, and more preferably 0 to 40%, from the end of the splice film 6 in the width direction toward the inside. A range region is preferred. The range in which the adhesive 7 is not provided is not limited to this, and a person skilled in the art can take an appropriate range as appropriate.
The requirement (3) is defined as 100% when the point 13 at the center of the surface of the first heat-seal layer 1 reaches the end from the straight line 10 extending in the longitudinal direction. In addition, the pressure-sensitive adhesive 7 is not provided in a range of 0 to 5% toward the outside from the straight line 10 extending in the length direction along the center point 13 of the surface of the first heat seal layer 1. preferable. According to the requirement (3), since there is no adhesive 7 in the area near the seam 5 between the preceding film 3 and the following film 4, heat sealing can be performed without hindrance by the adhesive, and the seam 5 can be heat-sealed. can be strengthened.
As the area where the adhesive 7 is not provided, there is a range of 0 to 20% outward from the straight line 10 extending in the longitudinal direction passing through the center point 13 of the surface of the first heat seal layer 1. Preferred is the range of 0-30%, particularly 0-80%. The range in which the adhesive 7 is not provided is not limited to this, and a person skilled in the art can take an appropriate range as appropriate.

FIGS. 6A to 6C are diagrams in which the adhesive 7 is provided so as to satisfy the above (1) and (2).
In FIG. 6(a), the adhesive 7 is positioned at the central portion of the splice film 6 (that is, the adhesive 7 is not positioned at the ends in the length direction and width direction of the first heat seal layer 1). ), the adhesive 7 does not come into contact with the liquid filled in the bag, and even if the contents are taken by mouth, there is no possibility that the adhesive 7 will be contained, which is hygienic. have an effect.
FIGS. 6(b) and 6(c) are diagrams in which the adhesive 7 is intermittently provided on a straight line 10 extending in the longitudinal direction passing through the central point 13 of the surface of the first heat seal layer 1. is. Such an intermittent pattern can reduce the area where the adhesive 7 is provided, thereby increasing the bonding strength between the splicing film 6 and the leading film 3 and trailing film 4 . The pattern size of each intermittently provided adhesive 7 is preferably smaller than the heat-sealing width in the bag-making process. A value of % is more preferred, and a value of 20 to 40% is even more preferred. By doing so, even if the adhesive 7 overlaps the vertical heat-sealed portion 8, there is an effect that the content does not leak. In addition, since the adhesive 7 is located in the central portion of the splice film 6 (that is, the adhesive 7 is not located at the ends in the length direction and width direction of the first heat seal layer 1). , the adhesive 7 does not come into contact with the liquid filled in the bag, and even if the contents are put into the mouth, there is no possibility that the adhesive 7 will be contained in the bag, which is hygienic.
FIG. 6(d) is a diagram in which a rectangular adhesive 7 that satisfies the above (1) and (3) is provided. In FIG. 6(d), since the adhesive 7 is not provided in the central portion, the seam 5 where the content is likely to leak can be more reliably heat-sealed, and the seam 5 can be sealed. have the effect of
FIG. 6(e) is a diagram in which a rectangular adhesive 7 that satisfies all of the above (1) to (3) is provided. FIG. 6(e) shows that the adhesive 7 is provided in the central portion of the spliced film 6 and at both ends in the width direction of the spliced film 6 so that the adhesive 7 is not present. Both effects of d) can be provided and are particularly preferable.
The shape of the pattern provided line-symmetrically is not limited to the pattern shown in FIG. If the pattern is axisymmetric, the splicing film 6 can be uniformly fixed in the mounted state without floating from the leading film 3 and the trailing film 4, and the heat-sealing work can be performed efficiently.

FIG. 7 is a plan view showing still another embodiment of the splicing film 6 partially provided with the adhesive 7. FIG.
As shown in FIG. 7, the adhesive 7 is provided so as to be point symmetrical with respect to the center point 13 of the surface of the first heat seal layer 1, and has the following (1') and (2' ) or (3').
(1′) The pressure-sensitive adhesive 7 is not provided in the areas of 0 to 5% and 95 to 100% from one longitudinal end of the first heat seal layer 1 to the other end.
(2′) The pressure-sensitive adhesive 7 is not provided in a range of 0 to 5% from one widthwise end of the first heat seal layer 1 toward the other end.
(3′) From a straight line 10 extending in the length direction through the center point 13 of the surface of the first heat seal layer 1, the range of 0 to 5% in the width direction of the first heat seal layer 1 The area is not provided with adhesive 7 .
In addition, the requirement (1') defines 100% when the first heat-seal layer 1 reaches from one end in the longitudinal direction to the other end. Moreover, it is preferable that the pressure-sensitive adhesive 7 is not provided in the regions of 0 to 5% and 95 to 100% inwardly from the ends of the first heat seal layer 1 in the longitudinal direction. Due to the requirement (1′), since there is no adhesive 7 in the area 12 where the vertical heat-sealed part 8 overlaps shown in FIG. The heat seal between 11 and splicing film 6 can be strengthened.
The region where the adhesive 7 is not provided is preferably a region in the range of 0 to 20% and 80 to 100% inward from the end in the length direction of the first heat seal layer 1, particularly 0 to 100%. Areas in the range of 25% and 75-100%, more preferably in the range of 0-45% and 55-100% are preferred. The range in which the adhesive 7 is not provided is not limited to this, and a person skilled in the art can take an appropriate range as appropriate.
On the other hand, if the area where the adhesive 7 is provided is small, it becomes difficult to keep the splicing film 6 placed on the leading film 3 and trailing film 4 . For this reason, it is preferable that the adhesive 7 is provided in a wide area up to near the boundary of the vertical heat-sealed portion 8 in a range that does not overlap with the vertical heat-sealed portion 8 in FIG.
Furthermore, the requirement of (2') defines 100% when the splice film 6 reaches from one end in the width direction to the other end. In addition, it is preferable that the pressure-sensitive adhesive 7 is not provided in a range of 0 to 5% from the end of the splice film 6 toward the inside. According to the requirement (2'), since there is no adhesive 7 in the vicinity of both ends in the width direction of the splice film 6, strong heat sealing can be performed without hindrance by the adhesive. As a result, the liquid filled in the bag can be prevented from entering the gap between the spliced film 6 and the film 11 for filling and packaging machines from the widthwise end of the spliced film 6 .
The region where the adhesive 7 is not provided is preferably a region in the range of 0 to 20%, particularly 0 to 30%, and more preferably 0 to 40%, from the end of the splice film 6 in the width direction toward the inside. A range region is preferred. The range in which the adhesive 7 is not provided is not limited to this, and a person skilled in the art can take an appropriate range as appropriate.
In addition, the requirement of (3′) is defined as 100% when the point 13 at the center of the surface of the first heat seal layer 1 reaches the end from the straight line 10 extending in the length direction toward the outside. . In addition, the pressure-sensitive adhesive 7 is not provided in a range of 0 to 5% toward the outside from the straight line 10 extending in the length direction along the center point 13 of the surface of the first heat seal layer 1. preferable. Due to the requirement of (3′), since there is no adhesive 7 in the area near the seam 5 between the preceding film 3 and the following film 4, heat sealing can be performed without hindrance by the adhesive, and the seam 5 is heat sealed. can be strengthened.
As the area where the adhesive 7 is not provided, there is a range of 0 to 20% outward from the straight line 10 extending in the longitudinal direction passing through the center point 13 of the surface of the first heat seal layer 1. Preferred is the range of 0-30%, particularly 0-80%. The range in which the adhesive 7 is not provided is not limited to this, and a person skilled in the art can take an appropriate range as appropriate.

FIG. 7(a) is a diagram in which a rectangular adhesive 7 that satisfies both (1′) and (2′) above is provided. In FIG. 7(a), since the adhesive 7 is positioned near the central portion of the spliced film 6, the adhesive 7 does not come into contact with the liquid filled in the bag. Also, there is no possibility that the adhesive 7 is contained, and it has the effect of being hygienic.
FIG. 7(b) is a diagram in which a rectangular adhesive 7 that satisfies the above (1') and (3') is provided. FIG. 7(b), in which the adhesive 7 is not provided in the central portion, has the effect of being able to more reliably heat-seal the seams 5 where the content is likely to leak, and to seal the seams 5. have.
FIG. 7(c) is a diagram in which a rectangular adhesive 7 that satisfies all of the above (1′) to (3′) is provided. In FIG. 7(c), since the adhesive 7 is provided at the central portion of the spliced film 6 and at both ends of the spliced film 6 in the width direction, the adhesive 7 is not present. ), which is particularly preferable.
By forming a point-symmetrical pattern, the splicing film 6 can be uniformly fixed in the placed state without being lifted from the leading film 3 and the trailing film 4, so that the heat-sealing work can be performed efficiently. .
The shape of the pattern provided point-symmetrically is not limited to the patterns shown in FIGS.

By partially providing the adhesive 7 as described above, it can be placed on the preceding film 3 and the following film 4, and the first heat seal layer 1 where the adhesive 7 is not provided is exposed to the surface Since the film 11 for filling and packaging machines can be heat-sealed, the content filled in the bag produced by the film 11 for filling and packaging machines does not leak out.

The area where the adhesive 7 is provided is preferably 5 to 50% of the surface area of the first heat seal layer 1, and the surface area of the first heat seal layer 1 is: It is more preferable to provide 20 to 40%.
If the area where the adhesive 7 is provided is 5% or less, the amount of the adhesive 7 is small, so that the film is not firmly fixed when performing the film splicing work, and improvement in work efficiency cannot be expected, which is not preferable. .
In addition, if the area where the adhesive 7 is provided exceeds 50%, the amount of the adhesive 7 becomes large, which hinders the heat-sealing property of the first heat-sealing layer 1, and the content is likely to leak. So I don't like it.

The thickness of the adhesive 7 is preferably 1 μm to 100 μm, more preferably 5 μm to 50 μm, even more preferably 10 μm to 30 μm.
If the thickness of the adhesive 7 is less than 1 .mu.m, the amount of the adhesive 7 is too small to firmly fix the films during the splicing work, and improvement in work efficiency cannot be expected.
In addition, when the thickness of the adhesive 7 is 100 μm or more, when the adhesive 7 is heat-sealed, the adhesive 7 spreads more than the pattern at the time when the adhesive 7 is provided, and the heat-sealing property of the heat-sealing layer is deteriorated. It is not preferable because it hinders and the contents are likely to leak.

The thickness of the splice film 6 is preferably 5 to 100 μm, more preferably 10 to 95 μm, even more preferably 15 to 90 μm.
If the thickness of the joint film 6 is less than 5 μm, the first heat-seal layer 1 is too thin and a sufficient amount of the heat-seal layer cannot be heat-sealed, resulting in leakage when the content is filled after bag making. is likely to occur, which is not preferable.
Further, when the thickness of the spliced film 6 is 100 μm or more, the thickness of the spliced film 6 portion becomes large when the film 11 for filling packaging machine is made into a bag, and the first heat seal layer 1 is sufficiently heat-sealed. It is not preferable because it is not possible to prevent the contents from leaking.

A splicing film for joining the trailing edge of the preceding film and the leading edge of the trailing film to each other will be described below with reference to examples. In addition, the evaluation method performed in each example is as follows.

(1) Sealing Workability The splicing film was put over the joint portion where the trailing end of the leading film and the leading end of the trailing film were butted against each other, and the splicing work was performed by one person using a handy sealer. If the seamed film could be heated and welded straight along the seam, it was evaluated as ◯.
(2) Presence or absence of liquid leakage from the bag immediately after pressure resistance test and after a few days after filling 50 mL of liquid in a bag made using leading and trailing films provided with a spliced film and placing a 30 kg weight on it for 1 minute. evaluated. The same test was repeated 4 times, and the case where leakage did not occur in all 4 times was evaluated as ◯, the case where leakage occurred one or more times was evaluated as Δ, and the case where leakage occurred in all 4 times was evaluated as x. As for the results of the pressure resistance test after a few days, the presence or absence of leakage after a few days was evaluated among those in which no leakage occurred immediately after the pressure resistance test.
(3) Bonding strength test The bonding strength when two films, which are assumed to be the preceding film and the following film, are bonded with a splicing film with a width of 15 mm was measured under the conditions of a chuck distance of 40 mm and a speed of 300 mm / min. It was measured by In addition, the bonding strength was evaluated according to the following criteria.
◎: Bonding strength is 50.0 N/15 mm or more ○: Bonding strength is 40.0 N/15 mm or more and less than 50.0 N/15 mm ×: Bonding strength is less than 40.0 N/15 mm Bonding strength is 50.0 N/15 mm or more If the film is strong, it can be used without being torn even if the film joined by the splicing film is set in a filling packaging machine and used with strong tension.

The layer structure of the spliced films used in Examples 1-3 and Comparative Example 1 was PE (8 μm)/printed-PET (12 μm)/PE (8 μm), and the PE layers on both sides of the biaxially stretched PET film were respectively A spliced film was made by laminating with an extrusion laminator.
Next, the spliced film was placed on the leading and trailing films, and heat-sealed using a handy sealer. After that, the bag produced through the bag-making process was filled with 50 mL of water.
In Comparative Example 2, Cellotape (registered trademark) [Nichiban No. 430] was used. The base material made of cellophane was provided with an adhesive on the entire surface, and the thickness including the adhesive was 51 μm.
Only in Comparative Example 2, cellophane tape was placed on the leading and trailing films without heat-sealing, and after bonding, the bag produced through the bag-making process was filled with 50 mL of water.

The first heat seal layer of the splice film was subjected to the following treatments.
Example 1: An adhesive was provided in the manner shown in Fig. 3(a).
Example 2: An adhesive was provided in the manner shown in Fig. 4(a).
Example 3: An adhesive was provided in the manner shown in FIG. 5(b).
Comparative Example 1: No adhesive was provided.
Comparative Example 2: An adhesive was applied over the entire surface.

As shown in Table 1, with respect to the sealing workability, when the adhesive was provided (Example 1-3, Comparative Example 2), the joining work could be performed by one person. On the other hand, in the case where the adhesive was not provided (Comparative Example 1), it was impossible for one person to perform the splicing work.
Regarding the pressure resistance test, when the adhesive was provided in a dot pattern on the surface of the first heat seal layer (Examples 1 and 2), leakage occurred immediately after pressure resistance and after several days in all four tests. I didn't. Further, when the adhesive was intermittently provided on the surface of the first heat-sealing layer along the width direction edge of the first heat-sealing layer (Example 3), immediately after pressure resistance, 1 out of 4 times Leakage occurred, but in the remaining 3 cases where leakage did not occur immediately after pressure resistance, leakage did not occur even after several days passed. In the case where no adhesive was provided (Comparative Example 1), no leakage occurred immediately after pressure resistance and after several days in all four tests.
In addition, when the adhesive was provided on the entire surface (Comparative Example 2), leakage occurred immediately after pressure resistance in all four tests.
Regarding the bonding strength test, when the adhesive was partially provided (dot pattern) (Examples 1 and 2) and when the adhesive was not provided (Comparative Example 1), the strength was 50.0 N / 15 mm or more. It was found that when the adhesive was provided in a dot pattern, the bonding strength was sufficient compared to when the adhesive was not provided.

1: First heat seal layer 2: Second heat seal layer 3: Leading film 4: Trailing film 5: Joint 6: Joint film 7: Adhesive 8: Vertical heat seal 9: Horizontal heat seal 10: Straight line 11 passing through the center point of the surface of the spliced film 6 (first heat-seal layer 1) and extending in the length direction: Filling and packaging machine film 12: Vertical heat sealing between the filling and packaging machine film 11 and the spliced film 6 Area 13 where part 8 overlaps: point 14 at the center of the surface of first heat seal layer 1: base material layer 15: continuous packaging bag

Claims (14)

A splicing film for joining the trailing end portion of the preceding film and the leading end portion of the trailing film by covering the joint portion where the trailing end portion of the preceding film and the leading end portion of the trailing film are butted against each other and heat-welding them. hand,
The splice film has at least a first heat seal layer,
A spliced film, wherein the first heat seal layer is partially provided with an adhesive. 2. The spliced film according to claim 1, wherein the pressure-sensitive adhesive is provided in a dot pattern on the surface of the first heat seal layer. 2. The spliced film according to claim 1, wherein an adhesive is provided intermittently on the surface of said first heat-sealing layer along the edges in the width direction of said first heat-sealing layer. The adhesive is provided so as to be symmetrical with respect to a straight line extending in the length direction through the center point of the surface of the first heat seal layer, and has the following (1) and (2) 2. The spliced film according to claim 1, which satisfies condition (3).
(1) A pressure-sensitive adhesive is not provided in areas ranging from 0 to 5% and 95 to 100% from one longitudinal end of the first heat seal layer toward the other end.
(2) A pressure-sensitive adhesive is not provided in an area ranging from 0 to 5% from one end in the width direction of the first heat seal layer toward the other end.
(3) A pressure-sensitive adhesive is not provided in a range of 0 to 5% from the straight line toward the widthwise end of the first heat seal layer. 2. The spliced film according to claim 1, wherein the adhesive is intermittently provided on a straight line passing through the center point of the surface of the first heat seal layer and extending in the longitudinal direction. The adhesive is provided so as to be point symmetrical with respect to the center point of the surface of the first heat seal layer, and has the following (1′) and (2′) or (3′) 2. The spliced film according to claim 1, which satisfies the conditions.
(1′) A pressure-sensitive adhesive is not provided in areas of 0 to 5% and 95 to 100% from one longitudinal end of the first heat seal layer toward the other end.
(2') A pressure-sensitive adhesive is not provided in a range of 0 to 5% from one end in the width direction of the first heat seal layer toward the other end.
(3′) from a straight line passing through the center of the surface of the first heat-sealing layer and extending in the length direction toward the end in the width direction of the first heat-sealing layer in the range of 0 to 5% The areas are not provided with adhesive. The spliced film according to any one of claims 1 to 6, wherein the pressure-sensitive adhesive is provided in 5 to 50% of the surface area of the first heat seal layer. The spliced film according to any one of claims 1 to 7, wherein the adhesive has a thickness of 1 to 100 µm. The spliced film according to any one of claims 1 to 8, wherein the spliced film comprises the first heat seal layer and a base layer. The splicing film comprises the first heat-sealing layer, the substrate layer, and the second heat-sealing layer in this order, and the pressure-sensitive adhesive is applied only to the first heat-sealing layer. 10. A spliced film according to Item 9. 11. The spliced film according to claim 9, wherein the base material layer contains polyethylene terephthalate as a main component. A film for a filling and packaging machine, wherein the leading film and the trailing film are joined by the splice film according to any one of claims 1 to 11. 13. The film for filling and packaging machines according to claim 12, which is used for filling liquids. 13. The film for filling and packaging machines according to claim 12, which is used for filling grainy powder.

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