JP2012086491A - Ultrasonic sealing method and method of manufacturing packaging bag using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adhesion method capable of reducing occurrence of adhesion failure and exhibiting excellent appearance of an adhesion part when adhering a member such as a tape with an engagement device or an atmosphere improving tape to a film.SOLUTION: In the ultrasonic sealing method, a tape-like member having a tape-like body part and having at least one thick part on the body part and the film are arranged in a laminated state, and are made to pass through a space between an ultrasonic horn and an anvil, and thus, the thick part and the film are adhered by ultrasonic bonding. The space S in ultrasonic bonding is set to satisfy the following expression (1) when a thickness of the body part is T1, a thickness of the thick part is T2, and a thickness of the film is T3; S≤(T1+T2+T3) (1).

Description

  The present invention relates to an ultrasonic sealing method for bonding a film and a tape-shaped member and a method for manufacturing a packaging bag.

In a packaging bag, a desiccant may be placed in the package to prevent moisture absorption of the contents, or an insect repellent may be enclosed to prevent insect damage and tick damage to clothing. Moreover, in order to prevent the rust of the metal part of an industrial part, a rust preventive agent may be enclosed in the packaging of an industrial part. In order to keep the inside of the packaging bag in an appropriate state as described above, various atmosphere improving substances are used.
In addition, by providing a band-shaped occlusion device (fitting tool) consisting of a male member and a female member at the opening part of the bag, the bag (chuck bag) that can be opened and closed is used in many fields such as food, pharmaceuticals, and miscellaneous goods. Has been.

As a method of using the atmosphere improving substance for a packaging bag, Patent Document 1 discloses a tape having a flat section (atmosphere improving tape) having a layer containing the atmosphere improving substance. This tape is used after being thermally bonded (fused) to the original film during bag making. As a method for heat bonding to the original film, it is shown that the tape is bonded by heat sealing with a heating roll or ultrasonic sealing (impulse sealing) with an ultrasonic sealing device in accordance with the feeding of the original film. By using the atmosphere improving tape, it is possible to obtain advantages such as prevention of misuse of the atmosphere improving substance and input leakage.
However, when the atmosphere-improving substance is provided as a single layer of the tape, the tape becomes soft and meanders when it is fed out.

  On the other hand, regarding a method for manufacturing a packaging bag having a bite, Patent Document 2 discloses a method in which a tape with a bite is continuously fused to an original film using a drum and an ultrasonic sealing device. Patent Document 3 discloses a method of continuously fusing a tape with a bite to a raw film using a drum and a heat seal bar.

In the technique disclosed in Patent Document 2, ultrasonic waves are used as a heating means. However, in order to obtain sufficient adhesive strength in terms of supplying energy necessary for bonding by ultrasonic waves, An ultrasonic horn or anvil having a shape elongated with respect to the flow direction or provided with a large number of point-like projections needs to be bitten into the tape. For this reason, there existed a problem that the external appearance of a seal part worsened. In addition, when the thickness of the tape in the flow direction is uneven, the amount of biting changes, so that the width of the seal line changes, which also causes the appearance defect.
Furthermore, since it bites and seals, there is a problem that pinholes are easily generated in the raw film.

  Further, as in Patent Document 3, when the tape with the bite is bonded to the film by heat bonding (heat sealing), it is necessary to increase the diameter of the drum in order to secure a certain heating time. For this reason, there are disadvantages that the apparatus becomes larger, the installation area of the bag making machine becomes larger, and the apparatus cost increases.

Moreover, in the sealing method using a drum like patent document 2 and 3, the groove | channel is provided in the drum in order to prevent meandering of the tape with a biting tool. However, when a grooved drum is used, it is necessary to prepare drums individually for tapes having various cross-sectional shapes, which increases manufacturing costs and complicates drum replacement in production.
Further, when trying to bond a thin and flat tape, there is a problem that the tape is easily detached from the groove. In addition, when a flat, thin and soft tape is thermally bonded to the original film on the entire surface of one side of the tape, the tape is stretched due to residual heat and cannot be sent to the next process.

  Accordingly, there is a demand for an adhesion method that causes less meandering, poor sealing, poor re-fitting, and wrinkling when a member such as a tape with an occlusion tool or an atmosphere improving tape is bonded to a wrapping film.

JP 2003-221075 A JP 2009-120240 A JP-A-9-39121

  An object of the present invention is to provide a bonding method in which, when a member such as a tape with an occlusal tool or an atmosphere improving tape is bonded to a film, there is little occurrence of defective bonding and the appearance of the bonded portion is good. .

According to the present invention, the following ultrasonic sealing method and the like are provided.
1. A tape-shaped member having a tape-shaped main body portion, in which at least one thick-walled portion is provided on the main body portion, and a film are arranged in a laminated state, and the gap between the ultrasonic horn and the anvil is passed. The thick portion and the film are ultrasonically bonded, the gap S during the ultrasonic bonding is defined as T1, the thickness of the main body portion is T1, the thickness of the thick portion is T2, and the thickness of the film is T3. In some cases, the ultrasonic sealing method is set so as to satisfy the following formula (1).
S ≦ (T1 + T2 + T3) (1)
2. The ultrasonic sealing method according to 1, which is set to satisfy the following formula (2).
(T1 + T3) <S (2)
3. 3. The ultrasonic sealing method according to 1 or 2, wherein the ultrasonic bonding is continuously performed.
4). The ultrasonic sealing method according to any one of 1 to 3, wherein a tip of the ultrasonic horn is parallel to the tape-shaped member, and the anvil has a roller shape.
5. The manufacturing method of a packaging bag including the process of adhere | attaching a tape-shaped member and a film by the ultrasonic sealing method in any one of said 1-4.

  According to the present invention, the tape-like member and the film can be adhered to each other with no adhesion failure.

It is a schematic width direction sectional drawing which shows an example of the shape of the tape-shaped member used by this invention. It is a figure which shows the example of the cross section of the thick part of the tape-shaped member used by this invention. It is a schematic width direction sectional drawing which shows an example of the tape-shaped member which has an atmosphere improvement layer. It is a schematic width direction sectional drawing which shows an example of the tape-shaped member which has an occlusion tool. It is a schematic width direction sectional drawing which shows the other example of the tape-shaped member which has an occlusion tool. It is a schematic width direction sectional drawing which shows the other example of the tape-shaped member which has an occlusion tool. It is a figure which shows the positional relationship of an ultrasonic horn, an original fabric film, a tape-shaped member, and an anvil in the method of this invention. It is a figure which shows the example of a shape of the ultrasonic horn used for the method of this invention. It is a figure which shows one Embodiment of the manufacturing method of the packaging bag of this invention. It is a figure which shows the example of the guide used for the manufacturing method of this invention. It is a schematic plan view of the packaging bag manufactured by embodiment. It is a figure which shows other embodiment of the manufacturing method of the packaging bag of this invention. It is a schematic top view which shows the process of adhere | attaching a tape-shaped member and an original fabric film. It is a schematic top view which shows the process of the side seal after folding an original fabric film. It is a schematic plan view of the packaging bag manufactured by other embodiment. 1 is a schematic cross-sectional view of a tape-shaped member having an atmosphere improving layer produced in Example 1. FIG. It is a figure which shows the shape of the ultrasonic horn used in Example 1. FIG. It is a figure which shows the shape of the guide used in Example 1. FIG. 6 is a schematic cross-sectional view of a tape-like member having an articulating device produced in Example 2. FIG.

The present invention relates to a method of ultrasonically bonding a tape-like member on a film, and one of the features is that a member having a tape-like main body portion and having at least one thick portion on the main body portion is used.
FIG. 1 is a schematic cross-sectional view in the width direction showing an example of the shape of a tape-like member used in the present invention.
The member 1 includes a tape-like main body portion 10 having a thickness T1, and a thick portion 11 having a thickness T2 projecting on one side, in the vicinity of an intermediate portion between the substantially central portion in the width direction of the main body portion 10 and the left end. By forming the thick part 11 protruding from the main body part 10, the ultrasonic waves used when the film 110 having the thickness T3 and the tape-like member 1 are bonded to the thick part 11 are selectively heated. The As a result, the main body portion 10 is hardly heated, so that the elongation of the member due to heat at the time of feeding can be suppressed. Moreover, since the thick part 11 and the film 110 adhere | attach and the main-body part 10 and the film 110 do not adhere, the adhesion line resulting from the thick part 11 is formed beautifully linearly after adhesion | attachment. Furthermore, since it is not necessary to strongly press-bond the member 1 and the film 110 at the time of adhesion, it is possible to suppress the generation of scratches and wrinkles on the film.

In the member 1, only one thick portion (one row) is formed in the main body portion, but the present invention is not limited to this, and a plurality of thick portions may be formed. Moreover, although the thick part is formed in the single side | surface of a main-body part, you may form not only in this but in both surfaces of a main-body part. Furthermore, the thick portion may be formed continuously (in a row) along the length direction of the main body, or may be formed intermittently (dot shape or the like). Furthermore, although the thick portion is formed near the middle between the width direction substantially center portion and the left end of the main body portion, the present invention is not limited thereto, and may be formed at the width direction end portion of the main body portion, for example.
The cross-sectional shape of the thick-walled portion is not limited to the semicircular shape as shown in FIG. 1, but for example, as shown in FIG. 2, a square shape, a circular shape, an elliptical shape, a trapezoidal shape, a bell shape, a triangular shape, etc. You can choose. FIG. 2 shows a cross-sectional shape of only the thick part.

The thickness T2 of the thick wall portion is preferably such that when the ultrasonic horn and the anvil are brought into contact with the main body portion and the ultrasonic wave is not dispersed, and the thick wall portion is crushed when bonded to the film using an ultrasonic sealing device. . Specifically, 10 μm to 2000 μm is preferable, and 200 μm to 1000 μm is particularly preferable.
In addition, when a thick part exists in both surfaces of a main-body part, it is preferable that the sum of the height of both sides becomes the range similar to the above.
The width of the thick part is preferably 300 μm to 2000 μm. If it is too narrow, it is difficult to obtain sufficient adhesive strength. On the other hand, if it is too wide, the energy of ultrasonic waves is dispersed in the bag making, so that sufficient adhesion cannot be obtained, or the resin pool on the heat bonding surface increases and the appearance is impaired.
The thickness T1 of the main body portion where the thick-walled portion is not provided is appropriately changed according to the use of the tape-like member. From the viewpoint of difficulty in deformation during bag making and ensuring flexibility, the thickness T1 is 50 to 500 μm. It is preferable to do.

Examples of the tape-like member used in the present invention include a member in which an atmosphere improving layer is formed on the main body, a member in which an occlusal tool is formed on one surface of the main body.
FIG. 3 is a schematic cross-sectional view in the width direction showing an example of a tape-shaped member having an atmosphere improving layer.
The cross section of the main body 10 in the tape-like member 2 has a structure in which the atmosphere improving layer 21 that is an intermediate layer is covered with a resin that forms the surface layer 22. The thick portion 11 is formed in the surface layer portion 22 as in the member of FIG.

As the atmosphere-improving layer, a material obtained by kneading a liquid fragrance, an adsorbent such as zeolite, a rust-preventing oil, an oxygen-absorbing oil or the like with a base material such as an elastomer can be used. Specifically, Japanese Patent Application Laid-Open No. 2003-221075 can be referred to.
As the surface layer portion, low density polyethylene (LDPE), linear low density polyethylene (L-LDPE), high density polyethylene (HDPE), random polypropylene (RPP), block polypropylene (BPP), homopolypropylene (HPP), etc. Known polyolefin resins and mixtures thereof can be used.
In addition, you may add modifiers, such as an elastomer, a slip agent, and an antiblocking agent, as needed.

4A to 4C are schematic cross-sectional views in the width direction showing an example of a tape-like member having an occlusal tool.
The tape-like member 3a (tape with a bite) shown in FIG. 4A has a configuration in which a male bite 31 is formed on one surface of the main body 10. Similarly, the tape-like member 3b shown in FIG. 4B has a configuration in which a female biting tool 32 is formed on one surface of the main body portion 10, and the member 3c shown in FIG. It has the structure which formed the biting tools 31 and 32, respectively. In any member, the thick portion 11 is formed in the vicinity of both ends in the width direction of the tape-like member 3a on the opposite surface of the surface on which the occlusal device is formed.
In addition, the tape with an occlusion tool can be manufactured by a well-known method.

In the method of the present invention, the above-mentioned tape-shaped member and the film are arranged in a laminated state, and the thick-walled portion and the film are ultrasonically bonded by passing between the ultrasonic horn and the anvil of the ultrasonic sealing device. To do.
In the present invention, the film and the tape-like member are bonded using ultrasonic waves. However, the ultrasonic sealing device to be used is not particularly limited, and those known in the art and commercially available for industrial use are used. it can. An ultrasonic sealing device generally includes an ultrasonic oscillator, a vibrator (converter), and a horn (resonator), and the ultrasonic vibration generated by the oscillator and the vibrator (for example, a frequency of 20 kHz) is covered by the horn. Conduct to the body. An anvil is placed at a position facing the horn, and the adherend is pressurized as it passes between the horn and the anvil, and frictional heat is generated by ultrasonic vibration, and a part of the adherend is heated. It is made to adhere by melting.
Since the ultrasonic sealing device is smaller and detachable than a heat sealing device that requires a device such as a large separator, it can be additionally attached to an existing automatic packaging machine.

FIG. 5A and FIG. 5B are schematic views showing examples of the positional relationship among the tape-shaped member, the film, the ultrasonic horn, and the anvil.
In FIG. 5A, the tape-shaped member 1 is disposed on the ultrasonic horn 140 side, and the film 110 is disposed on the anvil 130 side. On the other hand, in FIG.5 (b), the film 110 is arrange | positioned at the ultrasonic horn 140 side, and the tape-shaped member 1 is arrange | positioned at the anvil 130 side.
In the present invention, the arrangement shown in FIG. With this arrangement, the member is difficult to stretch due to heat, and a clean continuous seal can be easily obtained. In particular, it is preferable that the tip of the ultrasonic horn is parallel to the tape member and the anvil has a roller shape.
In addition, when using the member which has a convex part in a main-body part, such as a tape with a bite, as a member, it is preferable to use the anvil which has a groove | channel in which a convex part (for example, bite) fits.

In the present invention, when the gap between the ultrasonic horn and the anvil is S, the thickness of the main body is T1, the thickness of the thick part is T2, and the thickness of the film is T3, the following formula (1) is satisfied. To do.
S ≦ (T1 + T2 + T3) (1)
When the gap S exceeds (T1 + T2 + T3), the thick part of the member cannot be brought into contact with the film, and ultrasonic vibrations cannot be conducted, so that the bonding cannot be performed.

Moreover, in this invention, it is preferable to set so that following formula (2) may be satisfy | filled.
(T1 + T3) <S (2)
When the gap S is less than (T1 + T3), the portion other than the thick portion of the main body (the main body portion having the thickness T1) is also pressure-bonded to the film, so that the ultrasonic energy is dispersed, resulting in insufficient adhesion. It may become.

  The thickness T1 of the main body portion means a maximum value obtained by measuring a plurality of thicknesses of a portion having no cutout portion such as a protruding portion such as a thick portion of the main body portion or a bite or a half-folded portion. In addition, the thickness T2 of the thick part means the protruding height from the main body part, and when it is provided on both surfaces of the main body part, the total value thereof is used.

  Although the shape of an ultrasonic horn is not specifically limited, For example, a shape as shown in FIG. 6 is mentioned. (A) is a horn tip having a trapezoidal cross section, (b) is a horn tip having an arc shape, and (c) is a groove having an arc tip. Further, as shown in (d), the horn may be a roller that rotates.

As the shape of the anvil, like the shape of the horn, the tip of the horn has a trapezoidal cross section, the shape of the arc, the shape of the arc having a groove at the tip, or the shape of rotating in a roller shape, etc. . A roller-shaped anvil is preferable. A roller-shaped anvil eliminates rubbing and finishes beautifully, and rollers with various groove widths and depths can be easily prepared.
In addition, when using tape-shaped members having various cross-sectional shapes, a roller-shaped anvil provided with appropriate grooves may be used. For example, when using a tape with a bite as a member, a roller-shaped anvil provided with a groove for receiving the bite may be used. Thus, the method of the present invention can be easily applied to various tape-like members by exchanging the anvil. Therefore, since the packaging bag using various tape-shaped members can be manufactured, productivity is high.

  In the case of a roller-shaped anvil, the diameter may be about 20 mmφ. In this invention, since an ultrasonic sealing apparatus is used, a roller diameter can be made small compared with the adhesion | attachment by heat sealing. Therefore, the apparatus can be reduced in size as a whole and the equipment cost can be reduced. Although the diameter may be larger, it may be thinner than 20 mmφ as long as the strength to withstand pressure bonding and smooth rotation can be obtained.

  The ultrasonic bonding method of the present invention can be suitably used in the manufacture of packaging bags. In the manufacturing method of the packaging bag of the present invention, the step of adhering the tape-like member to the film by ultrasonic sealing, the two or three sides of the film are thermally bonded, and the side corresponding to the side portion of the packaging bag is cut (side cut). By doing, it is manufactured by the process of making it into the shape of a packaging bag. Hereinafter, one embodiment of a manufacturing method of a packaging bag of the present invention is described using a drawing.

FIG. 7 is a schematic view for explaining an embodiment of the method for producing a packaging bag of the present invention. This embodiment can be applied, for example, when the tape-like member having the atmosphere improving layer described above as the tape-like member is bonded to the film forming the packaging bag.
The apparatus shown in FIG. 7 includes a driving roll R ′ that feeds the original films 110 and 111 from a roll (not shown) of the original film, and the original films 110 and 111 that are drawn by the driving roll R ′. A plurality of guide rolls R supplied to the gap between the ultrasonic horn 140 and the anvil 130 of the ultrasonic sealing device or the gap between the heat seal bar 150 and the seal bar receiver 160, and the guide 120 for suppressing meandering of the tape-like member 1 The ultrasonic sealing device (the ultrasonic horn 140 and the anvil 130) for bonding the tape-shaped member 1 and the original fabric film 110 and the original fabric films 110 and 111 are bonded along the traveling direction of the film. The heat seal bar 150 and the seal bar receiver 160 for performing bottom sealing, and the raw film 110 and 111 are moved forward. Bonded in a direction perpendicular to the direction, with a heat seal bar 170 and the seal bar bearing 180 that performs side seal of the packaging bag.

Note that the bag making apparatus in FIG. 7 is partially omitted for convenience of explanation. For example, a side cut device that cuts into each packaging bag, an ultrasonic seal device main body, and the like are omitted, and known devices can be applied to them.
Moreover, although installation of the guide 120 is not essential, it is preferable to install the guide 120 in order to control the meandering of the member 1.
The material of the guide may be metal or synthetic resin, as long as the member does not shift and the member can be drawn out smoothly. Examples of the shape of the guide include a plate, a cylindrical body, a pulley, and the like provided with guide holes 121 that are slightly larger than the cross-sectional shape of the tape-like member as shown in FIG.
Although the distance between the guide and the ultrasonic horn depends on the meandering degree of the tape-like member, it is desirable to perform ultrasonic sealing immediately after the guide exit. When there is no meandering, the distance between the guide and the place to be thermally bonded may be long.

  In the present embodiment, first, the tape-like member 1 and the original fabric film 110 (the first film among the first and second films facing each other forming a packaging bag) are bonded by ultrasonic sealing. Specifically, the original film 110 is supplied from a roll of the original film, passed through the tension roll R, and then introduced between the ultrasonic horn 140 and the anvil 130. On the other hand, the member 1 is drawn out from the wound body of the member, passes through the guide 120 that controls meandering, and is then introduced between the ultrasonic horn 140 and the anvil 130. By passing the gap between the ultrasonic horn 140 and the anvil 130 while the original film 110 and the member 1 are overlapped, the thick part of the tape-like member 1 and the original film 110 are continuously thermally bonded.

Next, after the original film 110 and the member 1 are bonded, one end portions of the original film 110 and another original film (second film) 111 are thermally bonded by the heat seal bar 150 and the seal bar receiver 160 (bottom seal). )
Then, the part which becomes a side part of a packaging bag is heat-bonded (side-seal) by the heat seal bar 170 and the seal bar receiver 180. By cutting at a substantially central portion of the side-sealed portion, it is possible to obtain a packaging bag in which the tape-shaped member of the packaging bag is ultrasonically sealed. The unsealed portion is closed by thermal bonding or the like after filling the contents.

In FIG. 9, the schematic of the packaging bag obtained by this embodiment is shown.
In this packaging bag, the bottom seal portion 201 and the side seal portions 202 on both sides of the bag are thermally bonded by a heat seal bar 150 and a seal bar receiver 160, and a heat seal bar 170 and a seal bar receiver 180, respectively. It is a thing. The tape-shaped member 1 is adhered to the periphery of the opening portion on the side opposite to the bottom seal portion 201.

FIG. 10 is a schematic view for explaining another embodiment of the method for producing a packaging bag of the present invention. This embodiment can be applied, for example, when a tape-like member 3c having a male and female bite as shown in FIG. 4C is used as a tape-like member by adhering it to a film forming a packaging bag. As shown in FIG. 4C, the tape-like member 3c has a pair of male and female biting tools arranged in parallel on one side in the width direction of the main body, and the thick wall portion is opposite to the biting tool forming surface of the main body portion. Projected on the surface.
The apparatus shown in FIG. 10 includes a drive roll R ′ that feeds the original film 110 and the tape-like member 3c from the respective rolls, an ultrasonic horn 140 of an ultrasonic sealing device that feeds the fed original film 110 and the tape-like member 3c, and A guide roll R to be supplied to the gap between the anvils 130 and an ultrasonic sealing device (an ultrasonic horn 140 and an anvil 130) for bonding the tape-shaped member 3c and the original film 110 are provided. Further, after the tape-like member 3c and the original film 110 are bonded, the tape-like member 3c is folded at substantially the center line of the film 110 (the arrow A in FIG. 10 indicates the folding of the film). After making the state which bites 31 and 32, it has the heat seal bar 170 and the seal bar receptacle 180 which adhere | attach the laminated | stacked original film 110 in the direction orthogonal to the advancing direction of a film. Note that the bag making apparatus of FIG. 10 is also partially omitted for convenience of explanation.

FIG. 11 is a top view showing a process of bonding the tape-shaped member 3c and the original fabric film 110, and FIG. 12 is a top view showing a side seal process after the original fabric film 110 is folded. For simplification, illustration of the tape-like member 3c from the wound body to the guide roll R is omitted in FIG.
After the tape-like member 3c and the original film 110 are bonded by an ultrasonic sealing device, the entire film is folded in two along the dotted line indicated by A in FIG. After the male and female biting devices 31 and 32 of the tape-like member 3c are bitten (see FIG. 12), the side portions of the packaging bag are thermally bonded by the heat seal bar 170 and the seal bar receiver 180 ( Side seal). By cutting at a substantially central portion of the side seal portion 202, as shown in FIG. 13, the top seal of the packaging bag is not formed, and the packaging bag with the bottom opened is obtained with the entire film folded. be able to.

In each of the embodiments described above, only one row of ultrasonic sealing devices is used. However, the present invention is not limited to this, and two or more rows of ultrasonic sealing devices may be installed. When using, you may install one machine for each original film.
By installing two or more rows of ultrasonic sealing devices, a plurality of tape-like members can be thermally bonded in multiple rows. For example, the atmosphere-improving tape member and the tape member with the bite can be thermally bonded in two rows simultaneously or sequentially.
Further, by installing one ultrasonic sealing device for each original fabric film, for example, the members 3a and 3b having one of the male and female joints shown in FIG. 4A and FIG. It can be bonded on each of the two raw film.

  Further, in each of the above-described embodiments, the heat seal bar is used as an apparatus for bonding the raw film and performing bottom sealing and side sealing. However, the present invention is not limited thereto, and for example, an ultrasonic sealing apparatus is used. May be.

A general laminate film can be used as the raw film.
PET / LLDPE, PET / CPP, OPP / CPP, OPP / LLDPE, Ny / LLDPE, Ny / CPP or the like may be used as a basic configuration, and other layers may be provided as an intermediate layer as necessary. PET is polyethylene terephthalate, LLDPE is linear low density polyethylene, CPP is unstretched polypropylene, OPP is biaxially stretched polypropylene, and Ny is nylon.

  The manufacturing method of the packaging bag of this invention can manufacture easily the bag which uses various tape-shaped members only by attaching an inexpensive ultrasonic equipment to a general bag making machine.

Example 1
(1) Manufacture of a tape-like member having an atmosphere-improving layer A member having a shape shown in FIG. 14 by attaching a plate having a slit cross-section so as to have a desired tape cross-sectional shape to two extruders and a laminating feed block Manufactured. In this member, one row of thick portions 11 each having a substantially semicircular cross section are formed at both ends of the main body portion 10.
As the surface layer portion (coating layer) 22, random polypropylene (manufactured by Prime Polymer Co., Ltd., MFR = 7.0 g / 10 min) was used. As the atmosphere improving layer 21, particles obtained by kneading 10 wt% of Japanese mint oil in Kuraray Septon 2063 to make a compound were used.
The member body 10 has a thickness (T1) of 170 μm and a width (W1) of 20 mm. The thickness (T2) of the thick part 11 was 250 μm, and the width (W2) was 400 μm. The layer thickness of the atmosphere improving layer 21 was 100 μm.

(2) Production of packaging bag The tape-like member was bonded with the apparatus shown in FIG. 7 to produce the packaging bag shown in FIG.
The tape-shaped member produced in the above (1) was used, and a dry laminate film (total thickness T3 of the film was 42 μm) of PET (polyethylene terephthalate) 12 μm / CPP (unstretched polypropylene) 30 μm was used as the raw film.

The gap S between the ultrasonic horn and the anvil was 300 μm, and the distance from the guide to the ultrasonic horn was 50 mm. The output of the ultrasonic wave was 180W. FIG. 15 shows the shape of the ultrasonic horn used in this example, and FIG. 16 shows the shape of the guide.
As the anvil, a roll-shaped anvil (Misumi Corp., 20 mmφ, length 70 mm, shaft VSFJW) was used.
In Example 1, the total (T1 + T3) of the main body thickness T1 and the film thickness T3 of the tape-shaped member is 212 μm, and the total of the main body thickness T1, the thick portion thickness T2, and the film thickness T3 of the tape-shaped member (T1 + T2 + T3). Is 462 μm and the gap S between the ultrasonic horn and the anvil is 300 μm, so that (T1 + T3) <S <(T1 + T2 + T3), which satisfies both the relational expressions (1) and (2) described above.

Each time the film was fed at a pitch of 200 mm and 40 shots / minute, ultrasonic waves were transmitted by an ultrasonic horn, and the tape-like member was continuously sealed on the raw film. Only the thick portions at both ends in the width direction of the tape-shaped member were heat-sealed linearly in the original film traveling direction. Both ends in the width direction of the heat-sealed tape-like member were parallel and beautiful. The red penetrant was examined for pinholes in the seal part of the member, but no pinholes were generated.
In addition, when the film feed is stopped, it is only necessary to electrically stop the ultrasonic transmission, and even in the state where the ultrasonic transmission is transmitted, the thick portion of the contact portion between the film and the tape-like member is heated and melted. When crushed to some extent, the pressure between the film and the tape-like member is reduced and heat is not generated, so that excessive melting does not occur and the adhesion appearance is beautiful.

  Then, after heat-sealing 3 sides (bottom seal part, side seal part) of the bag with a heat seal bar and a seal bar receiver, the center part of the side seal was cut to obtain a packaging bag.

Example 2
(1) Manufacture of a tape-shaped member having an occlusal tool A tape-shaped member having a shape shown in FIG. 17 is obtained by attaching a plate having a slit hole to a desired cross-sectional shape to two extruders and a feed block for lamination. Manufactured. In this member, a male bite 31 is formed around one end in the width direction of one surface of the main body 10, and a female bite 32 is formed around the other end in the width direction. In addition, one row sandwiching the male and female biting tools 32 and 33 at one end of the other surface of the main body and the periphery thereof, and one row at the other end and the periphery thereof (four rows in total), the cross section is substantially semicircular. A thick thick portion 11 is formed. Further, a half-folded portion 42 for bending the member is provided at a substantially central portion of the lower surface of the main body portion 10.
Random polypropylene (manufactured by Prime Polymer Co., Ltd., MFR = 7.0 g / 10 min) is used for the surface layer portion of the main body 10 and the joint parts 31 and 32, and homopolypropylene (manufactured by Prime Polymer Co., Ltd.) is used for the intermediate core layer 41. , MFR = 7.0 g / 10 min) was used.
The member body 10 has a thickness T1 of 180 μm and a width (W1) of 50 mm. The thickness (T2) of the thick portion was 500 μm, and the width (W2) was 500 μm. The thickness of the intermediate core layer was 50 μm. The height of the bite was 1 mm.

(2) Manufacture of packaging bag The tape-shaped member was bonded with the apparatus of FIG. 10 to manufacture the packaging bag shown in FIG. The shape of the ultrasonic horn is the same as that of Example 1 except that the length in the width direction is changed to 60 mm (34 mm in Example 1). An anvil having a diameter of 20 mm and a length of 70 mm and having two grooves in which a bite fits in a stainless steel shaft was used.
The gap S between the ultrasonic horn and the anvil was 350 μm. The output of the ultrasonic wave was 180W. In Example 2, the total (T1 + T3) of the main body thickness T1 and the film thickness T3 of the tape-shaped member is 222 μm, and the total of the main body thickness T1, the thick part thickness T2, and the film thickness T3 (T1 + T2 + T3) of the tape-shaped member. Is 722 μm and the gap S between the ultrasonic horn and the anvil is 350 μm, so that (T1 + T3) <S <(T1 + T2 + T3), which satisfies both the relational expressions (1) and (2) described above.

The film was fed at a rate of 40 shots / minute at a pitch of 200 mm, and an ultrasonic wave was transmitted each time to continuously seal the four thick portions on the original film surface.
As a result, only the thick part was adhered in a straight line in parallel with the film original film traveling direction, and the heat seal was so beautiful that the seal part could not be identified.
The red penetrant was examined for pinholes in the seal part of the member, but no pinholes were generated.

After the tape-shaped member was sealed to the original fabric film, it was folded at the half-folded portion 42 of the member, the film was laminated, and the opposing male and female biting tools 31, 32 were bitten. The laminated film was thermally bonded (side-sealed) with a heat seal bar in the vertical direction of the tape-shaped member (see FIG. 12). By cutting the substantially central part of the side seal part, a packaging bag with the bottom part of the bag opened was obtained.
The bonding state of the male and female bite parts was good, and stable opening and closing was possible.

Example 3
In Example 1, bag making was performed under the same conditions as Example 1 except that the gap S between the ultrasonic horn and the anvil was set to 220 μm. In Example 3, since the total of the main body thickness T1 and the film thickness T3 of the tape-shaped member is 212 μm, (T1 + T3) <S <(T1 + T2 + T3), and the relational expressions (1) and (2) described above are satisfied. Satisfy both.
As a result, only the thick portions at both ends in the width direction of the tape-like member were heat-sealed linearly in the original film traveling direction. Both ends in the width direction of the heat-sealed tape-like member were parallel and beautiful. The red penetrant was examined for pinholes in the seal part of the member, but no pinholes were generated.

Example 4
In Example 1, bag making was performed under the same conditions as Example 1 except that the gap S between the ultrasonic horn and the anvil was set to 200 μm. That is, in Example 4, since the total of the main body thickness T1 and the film thickness T3 of the tape-shaped member is 212 μm, (T1 + T3)> S <(T1 + T2 + T3), and the above-described relational expression (1) is satisfied. (2) is not satisfied.
As a result, the tape-like member and the thick part could be bonded, but the film bite into the main part of the tape-like member, and a cloudy line was generated in the tape flow direction, resulting in some appearance defects. there were. Further, the sealing strength at the thick portion was also weaker than that in Example 1.

Example 5
In Example 1, bag making was performed under the same conditions as Example 1 except that the gap S between the ultrasonic horn and the anvil was set to 462 μm. That is, in Example 5, since the total of the main body thickness T1, the thick part thickness T2, and the film thickness T3 of the tape-shaped member is 462 μm, (T1 + T3) <S = (T1 + T2 + T3), which is described above. Both relational expressions (1) and (2) are satisfied.
As a result, compared with Example 1, ultrasonic waves are not easily transmitted between the thick part of the tape-like member and the film, the thick part and the film are partially bonded, the seal line is thin, and the strength is weak. However, it was judged that it could be used in some light packaging applications.

Comparative Example 1
In the tape-shaped member having the atmosphere-improving layer manufactured in Example 1, a member in which two thick portions were not provided was manufactured. This member was made in the same manner as in Example 1 except that the gap S between the ultrasonic horn and the anvil was set to 150 μm.
In Comparative Example 1, since the tape-shaped member is formed only by the main body portion without the thick portion, the main body thickness T1 (150 μm) of the tape-shaped member and the gap S between the ultrasonic horn and the anvil are the same (T1 = S). is there.
As a result, the entire surface of the tape-like member was squeezed by the ultrasonic horn and the anvil, causing surface roughness. Moreover, only partial adhesion was possible.

Comparative Example 2
Using the tape-shaped member having the atmosphere improving layer manufactured in Example 1, a packaging bag was manufactured. As a packaging bag manufacturing apparatus, a stainless steel roll (diameter 50 mmφ, width 30 mm) around which silicone rubber having a hardness of 70 mm and a thickness of 3 mm is installed instead of the anvil 130 shown in FIG. In place of the ultrasonic horn 140, a brass heat seal roll (diameter 50 mmφ, width 30 mm) was installed, and the tape-like member and the film were bonded by heat sealing.
Heat sealing was performed continuously at a heat seal roll temperature of 160 ° C. and a cylinder pressure of 1 MPa (cylinder diameter 30 mmφ).
As a result, there was a problem that the film and the tape-like member were melted by heating unless the heat seal roll was separated from the film until the start of adhesion. In addition, after starting heat sealing continuously, if the bag making speed is increased, the film and the tape-like member are difficult to adhere to each other. On the other hand, if the heat-sealing temperature is too high, the film or tape-like member is heated by residual heat. The film and tape-like member became soft and stretched during take-up. Therefore, strict condition adjustment was necessary.

Comparative Example 3
In Example 1, bag making was performed under the same conditions as Example 1 except that the gap S between the ultrasonic horn and the anvil was set to 470 μm. That is, in Comparative Example 4, the total of the main body thickness T1, the thickness T2 of the thick portion, and the film thickness T3 of the tape-shaped member is 462 μm, and does not satisfy the above-described relational expression (1).
As a result, no ultrasonic wave was transmitted between the thick part of the tape-like member and the film, and no adhesion was observed.

  The ultrasonic bonding method of the present invention is suitable for the production of packaging bags, specifically, can be applied to the production of various packaging bags such as food packaging, miscellaneous goods packaging, and medicine packaging.

1, 2, 3a, 3b, 3c Tape-shaped member 10 Tape-shaped main body 11 Thick-walled portion 21 Atmosphere-improving layer 22 Surface layer portion 31 Male occlusion device 32 Female occlusion device 41 Intermediate core layer 42 Half-folded portion 50 Separator 51 Grooves 110 and 111 Original film 130 Anvil 140 Ultrasonic horn 150 and 170 Heat seal bar 160 and 180 Seal bar receiver 201 Bottom seal part 202 Side seal part R Guide roll R 'Driving roll T1 Thickness T2 of tape-like member main body part T2 Meat thickness T3 Film thickness

Claims (5)

A tape-shaped member having a tape-shaped main body portion, in which at least one thick-walled portion is provided on the main body portion, and a film are arranged in a laminated state, and the gap between the ultrasonic horn and the anvil is passed. , Ultrasonically bonding the thick part and the film,
The gap S during the ultrasonic bonding is set so as to satisfy the following formula (1) when the thickness of the main body portion is T1, the thickness of the thick portion is T2, and the thickness of the film is T3. Ultrasonic sealing method.
S ≦ (T1 + T2 + T3) (1) The ultrasonic sealing method of Claim 1 set so that following formula (2) may be satisfy | filled.
(T1 + T3) <S (2)   The ultrasonic sealing method according to claim 1 or 2, wherein the ultrasonic bonding is continuously performed.   The ultrasonic sealing method according to claim 1, wherein a tip of the ultrasonic horn is parallel to the tape-shaped member, and the anvil is in a roller shape.   The manufacturing method of a packaging bag including the process of adhere | attaching a tape-shaped member and a film by the ultrasonic sealing method in any one of Claims 1-4.

Images