JP3450817B2 - Connection method of laminated film - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a laminated film,
Mostly in laminated films used for packaging,
For example, a method for connecting the rear end portion of one laminated film and the front end portion of another laminated film without using an adhesive tape or other connecting material, and particularly for an interconnected portion of the laminated film. , Like any other part,
It proposes a technology that enables liquid-tight or air-tight heat sealing.

[0002]

2. Description of the Related Art A laminated film for packaging, which is used, for example, in the case of continuously filling and packaging liquids, powders and the like, and in the case of intermittent filling and packaging, which is used for producing a packaging bag filled with an article to be packaged. Is generally applied to a packaging device in a state of being wound into a roll through a printing process, a laminating process and a slitting process.

In this case, in the slitter step, the side portions of the film are mainly cut and removed in order to keep the width dimension of the laminated film to a constant value, and the length of the film wound in a roll shape is mainly used. The total winding length of the film is adjusted to 1000m, 2000m
In order to obtain a predetermined length such as the above, the laminated films are connected to each other, and the films are joined after the defective printing portion, the defective lamination portion and the like are cut and removed.
Therefore, for example, for a 2000 m roll film,
When the number is large, there are about 2 to 3 film connecting portions.

By the way, conventionally, a laminated film including a base film layer and a sealant layer is connected by an adhesive tape in which the rear end of one laminated film and the leading end of another laminated film are attached to the base film surface side. It is carried out by butt-joining via, for example.

[0005]

In the laminated film thus connected, however, an adhesive tape or the like made of a material different from that of the laminated film is used to manufacture a packaging bag using the laminated film. In addition to increasing the thickness, the adhesive tape, etc. prevents the heat transfer from the heat seal blade to the sealant layer due to its inherent physical properties, and the sealant layer is fused to the sealant layer. substantially impossible that because be melted to a degree sufficient to, for example, when applied to the continuous filling and packaging such as packaging apparatus of this laminated film to rotate while maintaining a constant clearance, the pair Even if it is possible to pass the film connecting part as it is between the vertical heat seal blades as the rotary seal blades of the Note undergoing a pressure effect, can not be sufficiently thermally fused, thus, leakage of liquid and other material to be packaged, there is a problem that scattering and the like may occur. And
The same thing can be said that it is not possible to connect the end portions of the laminated film to each other with sufficient air-tightness or liquid-tightness to the packaging bag under the required strength by using an adhesive tape or the like. Occur.

Therefore, conventionally, every time the connecting portion of the laminated film is drawn out from the winding film, the entire packaging device or main parts such as the heat sealing function portion and the filling function portion are temporarily stopped, and After passing the connecting part to the main part of the device, the filling and packaging is restarted, and at the time of restarting, the amount of the packaged item in the packaging bag is confirmed, the heat sealing position and the sealing state are confirmed, and the packaging is performed. After confirming the cutting position of the bag and the formation position of the tear notch, etc., and putting all of these within the allowable range, the equipment will be restarted in earnest. Therefore, it takes a lot of time and man-hours from the suspension of the equipment or main functional parts to the restart of the equipment, and there was a big problem in work efficiency and efficiency. However, there is also a problem that a considerable amount of the laminated film and the material to be packaged are inevitably consumed and the material yield is reduced.

Therefore, according to the present invention, the laminated films are connected to each other without using a connecting material such as an adhesive tape, and the connecting portion is formed into a bag for a packaging bag like the other portions of the laminated film. The efficiency and efficiency of filling and packaging work of the items to be packaged are improved by fully contributing to the connection and realizing excellent air-tightness and liquid-tightness of the connection, and also by giving sufficient tensile strength to the connection. Effectively increases, and also
Provided is a method for connecting laminated films, which can greatly improve the material yield.

[0008]

A method for connecting laminated films according to the present invention comprises a thermoplastic stretched base film layer,
When interconnecting the end portions of each laminated film including the sealant layer, each end portion of the laminated film is fused and sealed with the sealant layer facing each other.
Preferably, by fusion bonding in a palm shape under pressure, then, in the bending posture of the joint portion of the sealant layers mutual to one laminated film side, the stretched base film layers facing each other under pressure, , Is fused over a width of 0.1 to 1 mm .

According to this method, the rear end of one laminated film and the front end of another laminated film are interconnected with high airtightness and liquid-tightness without using a connecting material such as an adhesive tape. In addition to the above, the connecting part is also made into a bag for packaging in the same manner as the other parts of the laminated film under the action peculiar to the sealant layer exposed on the surface opposite to the side where the bending and fusion are bonded. In addition to sufficiently contributing to, the connection portion, it is possible to impart the bag breaking strength required for the packaging bag, for this reason, during the filling and packaging of the object to be packaged, even if the connection portion is fed from the winding film. The continuous operation of the packaging device can be continued to continuously produce the packaging bag filled with the article to be packaged.

Therefore, the efficiency and efficiency of the filling and packaging operation and the material can be improved as compared with the prior art in which the main functional portion of the packaging device must be temporarily stopped each time the connecting portion is drawn out from the winding roll of the laminated film. The yield can be greatly improved.

Further, the direction of this method, by performing fusion bonding of the sealant layer mutually me by the heat-sealing, if all the layers of the laminated film is made of a thermoplastic resin material, sheet over <br/> Since the length of the joint-like joint of the runt layer can be minimized by making it necessary, when the stretched base film layers are fused together in the bent posture, the width of the fused portion is approximately linear. The influence of the fusion bonding portion on the bag making of the packaging bag can be minimized. In addition,
In this case, the width of the bent fusion-bonded part is 0.1 to 3 mm,
It is preferably about 0.5 to 1 mm. That is,
If it is less than 0.1 mm, it is difficult to secure the tensile strength because the area of the fused portion becomes too small, while if it exceeds 3 mm, the temperature of the sealant layer under the action of high temperature and high pressure for mutual fusion of the stretched base film layers is high. Since the flow rate becomes too large, the resin content of the seal-shaped fused portion between the sealant layers becomes too small,
Also, it becomes difficult to secure the tensile strength of the connecting portion.

By the way, the laminated film is a thermoplastic stretched base film layer, for example, a biaxially stretched nylon film layer, a biaxially stretched polyester film layer, a biaxially stretched polypropylene film layer, a biaxially stretched ethylene / vinyl alcohol copolymer. Other than having a laminated structure including a film layer and the like, and a sealant layer, for example, various polyethylene layers, ethylene / vinyl acetate copolymer layers, unstretched polypropylene, ethylene / acrylic acid copolymer layers, ionomer layers, etc. In addition, between the stretched film layer and the sealant layer, in addition to various film layers, metal foil such as aluminum foil, paper, various vapor deposition layers, vinylidene chloride copolymer coat layer and other intermediate layers can be interposed. , very particularly, aluminum foil, if the is interposed an intermediate layer such as paper, the method described above Then, after the fusion bonding of the sealant layers to each other in a palm-shape, prior to the fusion of the stretched base film layers, it is possible to cut off the intermediate layers by cutting both laminated films under the fusion-bonded joints. Preferably, according to this, since it is possible to reliably remove the excess portion following the fusion-bonded portion, the fusion width by the subsequent bending fusion-bonding of the bonding portion is set to a predetermined value of 0.1 to 1 mm, and the folding is performed. It is possible to sufficiently reduce the influence of the bent fusion-bonded portion on the bag-making work and the like while ensuring a sufficient tensile strength in the bent fusion-bonded portion.

[0013]

Figure 1 DETAILED DESCRIPTION OF THE INVENTION is an enlarged sectional view showing the shape condition of implementation of the invention, figure 2 shows the respective laminated films for packaging. Each of these laminated films 1 and 2 comprises stretched base film layers 3 and 4 made of a thermoplastic resin material, and sealant layers 5 and 6 directly laminated on the stretched base film layers 3 and 4 in the figure. , and the wherein the first, carried out by bonding with one of the rear end portion of the laminate film 1, the joining with the other tip portion of the laminate film 2, a sealant layer 5 and 6 to the butt-seamed.

Such joining of both sealant layers 5, 6 is
It is also possible to interpose an adhesive between these two layers, but in order to perform the joining with sufficient strength without using a special material for connection or joining, a sealant is used. It is preferable to heat and pressurize the layers 5 and 6 rapidly and cool them so that the stretched base film layers 3 and 4 are fused while restraining the heat shrinkage.
To do this, as mentioned above, both laminated films 1, 2
And by heat-sealing them being in contact with one another by pairs toward the sealant layer 5,6, the thermally fusing both sealant layers 5 and 6 in the blowing edge and its vicinity in this case mutually Is preferred. Next, here, the sealant layers 5 and 6, and by extension, the fusion-bonded joint portions 7 of the laminated films 1 and 2 are folded to one laminated film side, that is, the laminated film 1 side in the figure, to be mutually bonded. The stretched base film layers 3 facing each other are fused under heat and pressure.

As described above, the connecting portion 8 of the laminated film layers 1 and 2 configured as described above has a bonding strength sufficiently larger than the tension acting on the laminated films 1 and 2 in the packaging device. It has, and it can be directly passed through between vertical sealing blades of the continuous filling and packaging apparatus of the packaged articles, of course, by its passage, to sufficiently exhibit the gas-tight and heat seal strength required for the packaging bag You can Therefore, the laminated film having the connecting portion is applied to, for example, an automatic filling and packaging apparatus, and is folded in two in the width direction,
While heat-sealing the sealant layers at both free end portions with a vertical heat seal blade, the film connecting portion is continuously or intermittently filled into the film when a packaging bag is manufactured. It is not necessary to temporarily stop the packaging device even if the heat sealing blade reaches the length or width, and it is possible to realize sufficient bag-making packaging of the packaged object.

Incidentally, the stretched base film layer is
When the biaxially stretched nylon film layer having a thickness of μm is used and the sealant layer is a polyethylene layer having a thickness of 50 μm, the tensile strength of the connecting portion is 40 N per 15 mm width, which is generally required for a packaging bag. The value is about 67% with respect to the tensile strength of 60 N, which is much larger than the tensile force of 15 N per 15 mm width, which is the tensile force that acts on the laminated film during the filling and packaging of the packaged object. So the filling and packaging itself can be done without any hindrance.

By the way, the connecting portion 8 as described above is shown in FIG.
As shown in (a), the width direction YY of the laminated films 1 and 2
It is preferable to extend at a slight inclination with respect to. According to the connecting portion 8 as described above, the laminated films 1 and 2 connected to each other are applied to a packaging device, for example, as shown in FIG.
As shown in (b), in the state of being folded in two in the width direction, vertical heat seal portions 11 are provided at both free end portions thereof, and a horizontal heat seal portion 12 is provided at intervals in the length direction of the film.
In the case of performing the filling and packaging of the packaged object while forming each of them, the extension position of the connecting portion 8 is set between the front surface portion 13a and the rear surface portion of the packaging bag 13 to be manufactured.
Can be shifted in the extending direction of. As a result, effective concentration of stress on a specific portion of the packaging bag 13 can be prevented,
The breaking strength of the packaging bag 13 can be increased.

However, the packaging bag 13 in which the connecting portion 8 extends
From the viewpoint of appearance, is usually discarded after the packaging bag 13 is manufactured. Therefore, in practice, it does not need to have a strength as high as that of the packaging bag as a product, and is broken until the end of filling packaging. It suffices to prevent leakage, scattering, etc. of the packaged items in the bag without producing a bag or the like.

By the way, such a connecting portion 8 can be formed, for example, as follows. First,
As shown in FIG. 3 (a), the required lengths of the rear end portion 1a and the front end portion 2a of each of the laminated films 1 and 2 are positioned at an interval of 1 to 15 mm, preferably 2 to 3 mm. The sealant layers are inserted between the bases 21 and 22 in a manner such that they face each other, and as shown in FIG. 3 (b), the lower pusher 23 presses both film end portions against the sealer 24. By operating the sealer 24 , the sealant layers are fusion-bonded to each other in an arcuate shape, resulting in a fusing seal as shown in FIG. 3 (c). Then, as shown in FIG. 3 (c), the pusher 23 is moved backward or without being moved backward, and as shown in FIG. 3 (d), the film front end portion 2a, preferably both end portions 1a, is removed. , 2a until it is restrained by the positioning gauge 25 inserted between the two bases 21, 22
It is pulled up from the space so that the fusion-bonded joint portion 7 of the sealant layer is positioned precisely corresponding to the fusion-sealer 26 on the upper side. In this case, the fusion-bonded portion 7 inevitably tends to be delayed due to friction with the base 22 due to the pulling, and is in a posture of being bent toward the film rear end portion 1a side.

Then, thereafter, while the positioning gauge 25 is pulled out, the pusher 27 on the upper side is advanced and displaced as shown in FIG. 3 (e) to form a stretched base film layer on one side of the fusion-bonded portion 7. , The stretched base film layer of the film rear end portion 1a is sufficiently adhered, and the fusion sealer 26
To allow the two stretched base film layers to fuse well together, resulting in the intended connection of the two laminated films 1, 2 and finally the end portions 1a, 2a shown in FIG.
As shown in (f), a series of connecting work is completed by pulling out from between the bases 21 and 22.

When the laminated films 1 and 2 are provided with a non-fusing intermediate layer such as aluminum foil or paper, they are provided adjacent to the lower side of the pusher 23 and the sealer 24 and a cutting means such as, for example, Shearing means including a shearing blade that is displaced back and forth from one base toward the other base, and a receiving recess that is formed in the other base and that defines a receiving blade that contributes to the shearing of the film end portions 1a, 2a. It is preferred that, regardless of whether the lower sealer 24 is a fusible sealer or a fusion sealer, after the sealant-like cross-bonding of the sealant layers, the continuous film edge is located at that position. By reliably cutting at the intended position, the subsequent fold fusion of the sealant layer interconnects can always be carried out under a constant fusion morphology.

[0022]

As is apparent from the above description, according to the present invention, the laminated films can be interconnected without using a connecting material such as an adhesive tape to obtain excellent airtightness and liquid tightness. And the high tensile strength, and since the connecting part can function like other parts of the laminated film, the connecting part can reach the heat-sealing blade every time. Since it is not necessary to temporarily stop the device or the like, it is possible to greatly improve the material yield in addition to the packaging work efficiency and efficiency.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a diagram showing an example of an inclined extension of a connecting portion.

FIG. 3 is a cross-sectional view illustrating a step of interconnecting laminated films.

[Explanation of symbols]

1, 2 laminated film 1a, 2a end part Stretched base film layer 5, 6 sealant layer 7 Fusion spliced part 8 connection

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B29C 65/00-65/82 B29C 53/00-53/84 B65B 41/12 501 B65H 19/00-19 / 30 B65H 21/00-21/02

Claims (2)

(57) [Claims] 1. When interconnecting the ends of each laminated film comprising a thermoplastic stretched base film layer and a sealant layer, the respective end portions of the laminated film are made to face each other with the sealant layer facing each other. In a posture, they are fusion-bonded to each other in a palm shape by fusing seal , then, in a jointed position of the sealant layers to each other, in a bending posture to one laminated film side, under pressure between the stretched base film layers facing each other , 0.1-1mm width
A method for connecting laminated films, in which the layers are fused together. 2. A thermoplastic stretched base film layer and a sealant layer, and a non-fusible intermediate layer interposed therebetween.
When interconnecting the end portions of the respective laminated films including the interlayer, the respective end portions of the laminated films are fusion-bonded in a chisel shape with the sealant layers facing each other, and then,
Both laminated films are cut below the joint portion of the sealant layers, and further, in the bending posture of the joint portion to one laminated film side, the stretched base film layers facing each other are pressed, A method for joining laminated films, which comprises fusing over a width of 0.1 to 1 mm .