JP2012035872A - Unsealing tape, method for manufacturing packaging bag using the same, and packaging bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an unsealing tape at least one end of which in the width direction thereof is reliably bonded to a film, and to provide a packaging bag with the same.SOLUTION: The unsealing tape includes: a body 10; and a thickened portion 20 thicker than the thickness of the body 10, and which is provided at at least one of the ends of the body 10 in the width direction. The unsealing tape is configured such that the body 10 includes at least 2 layers of a base material layer 12 and a surface layer 14, and the surface layer can be peeled off easily from the base material layer.

Description

  The present invention relates to an opening tape, a method for manufacturing a packaging bag using the same, and a packaging bag.

  In food packaging, miscellaneous goods packaging, medicine packaging, and the like, there is a demand for a packaging bag that can be easily opened without using a bag or knife. Further, in order to prevent leakage of contents that cannot be used at once after opening, drying, moisture absorption, mixing of foreign substances, and invading pests, resealability is required for packaging bags.

  Patent Document 1 discloses a packaging bag having an easily peelable tape, and Patent Document 2 discloses a resealable packaging bag having a resealable laminated tape. Patent document 3 discloses a plastic bag provided with a tape for accurately opening the bag.

Patent Document 4 proposes a tape having easy releasability or re-adhesion after peeling, and discloses that this tape is interposed between the film seals on the sides of the four-side bags or three-way pillow bags to be opened.
However, when making a bag with a three-way sealing machine as a four-sided bag, it is necessary to use a bag making machine capable of making a bag with a chuck. That is, a tape jig called a separator and a sealing jig with a seal pedestal must be modified into a grooved guide through which the tape passes, and the substrate side of the tape must be thermally bonded to the film on one side using this guide. As a result, there is no versatility, and when installed, expensive equipment is introduced.

  Furthermore, in this case, heat bonding cannot be performed up to the end of the tape that enters the groove, and the width at which the peeling portion can be bonded in the next step is narrowed. In order to give openability, it is necessary that the peeled portion adhesive portion is closer to the contents side than the base material side seal width. However, if the sealable width is narrow, accuracy is required for the seal position of the peeled portion.

  Also, if the tape is flat and soft, it will be easily removed from the guide, and the tape will tend to meander when the tape is inserted into the palm of the three-way pillow bag.

Japanese Patent Laid-Open No. 9-226781 JP 2006-199343 A JP-A-9-301383 International Publication No. 2008/001768 Pamphlet

  An object of the present invention is to provide an opening tape capable of reliably bonding at least one end in the width direction of the tape when the film is bonded to a film, and a packaging bag using the same.

According to the present invention, the following opening tape and the like are provided.
1. A main body portion and at least one end portion in the width direction of the main body portion has a thick portion thicker than the thickness of the main body portion, the main body portion includes at least two layers of a base material layer and a surface layer; An opening tape whose layer side is peelable from the substrate layer side.
2. 2. The opening tape according to 1, wherein thick portions are present at both ends in the width direction of the main body.
3. The opening tape according to 1 or 2, wherein the main body includes an adhesive layer between the base material layer and the surface layer.
The manufacturing method of a packaging bag including the process of heat-bonding the thick part of the opening tape in any one of 4.1-3 to the film for packaging bags with an ultrasonic horn and an anvil.
5. The manufacturing method of the packaging bag of 4 with which the front-end | tip of the said ultrasonic horn is parallel to the said opening tape, and the said anvil is roller shape.
The packaging bag which has the opening tape in any one of 6.1-3 in an opening part.

  ADVANTAGE OF THE INVENTION According to this invention, when making it adhere | attach to a film, the opening tape which can adhere | attach reliably at least one edge part of the width direction of a tape, and a packaging bag using the same can be provided.

It is a figure which shows one Embodiment of the opening tape of this invention. It is a figure which shows other one Embodiment of the opening tape of this invention. It is a figure which shows other one Embodiment of the opening tape of this invention. It is a figure which shows an example of the adhesion state of the opening tape of this invention, and the film of a packaging bag. It is a figure which shows the example of the cross section of the thick part of the opening tape of this invention. It is a figure which shows one Embodiment of the manufacturing method of the opening tape of this invention. It is a figure which shows the example of the ultrasonic horn used for the manufacturing method of this invention. It is a figure which shows the example of the anvil used for the manufacturing method 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 figure which shows the positional relationship of an ultrasonic horn, an original fabric film, an opening tape, and an anvil in the manufacturing method of this invention. 1 is a cross-sectional view of an opening tape produced in Example 1. FIG. It is an enlarged view of the ultrasonic horn used in Example 1 and Comparative Examples 1 and 2. It is a figure which shows the guide used in Example 1 and Comparative Examples 1 and 2.

The opening tape of the present invention has a main body portion and at least one thick portion thicker than the thickness of the main body portion at at least one end in the width direction of the main body portion, and the main body portion has at least two layers of a base material layer and a surface layer. The surface layer side can be peeled from the base material layer side.
The base material layer is provided on the main body from the viewpoint of tape rigidity, prevention of elongation and / or heat resistance.

  The surface layer does not need to be in direct contact with the base material layer and peeled off from the base material layer, but may be peeled off from a part of the main body including the base material layer (for example, a laminate including the base material layer and other layers). Further, it is not necessary for the surface layer to peel off only the surface layer, and a part of the main body including the surface layer (for example, a laminate comprising the surface layer and another layer) may be peeled off.

  One embodiment of the present invention is shown in FIG. 1A. The opening tape 1 includes a main body 10 and a thick portion 20 that is thicker than a thickness T <b> 1 of the main body 10 at one end in the width direction of the main body 10. The thick part 20 protrudes on the main body part 10. The main body 10 is in the form of a tape having a substantially uniform thickness, and is a laminate composed of a base material layer 12 and a surface layer 14.

  As shown in FIG. 1B, thick portions 20 may be provided at both ends in the width direction of the main body portion 10. Further, as shown in FIG. 1C, the thick portion 20 may protrude above and below the main body portion 10. Furthermore, it may protrude only underneath, or the thick portions on both sides may protrude in the opposite direction.

The opening tape of the present invention can be used for sealing or opening a packaging bag by adhering to the opening of the packaging bag.
The opening tape of the present invention has a configuration in which the main body portion includes at least two layers of a base material layer and a surface layer, the surface layer side is peelable from the base material layer side, and imparts easy peelability when the packaging bag is opened. It becomes possible.

  Specifically, as shown in FIG. 2, in the opening portion of the packaging bag composed of the first and second films 110 and 111 facing each other, the base material layer 12 side of the opening tape is bonded to the first film 110. The surface layer 14 adheres to the second film 111 and seals the packaging bag. When opening the packaging bag, if the first and second films 110 and 111 in the opening are pulled in opposite directions, the surface layer 14 adhered to the second film 111 is torn and opened from the opening tape.

In the adhesion between the base layer 12 side and the first film 110, the thick portion 20 is adhered to the first film. The base material layer 12 may or may not adhere to the first film. Further, in the adhesion between the surface layer 14 side and the second film 111, it is not necessary that the entire surface layer is adhered to the second film, and usually a peeling seal line (peeling seal) formed at the central portion in the longitudinal direction of the surface layer. ) At 30, adhere to the second film.
As shown in FIG. 2, since the film is bonded to the film at the tape end portion 20 on the outer side (opening side) from the peeling start point, the opening can be reliably performed.

When flat tape is sealed with an ultrasonic sealing device, the ultrasonic waves come into surface contact, so energy is dispersed and it is difficult to reliably seal. On the other hand, in the opening tape of the present invention, by providing a thick portion at at least one end portion in the width direction, the ultrasonic waves are in line contact at the thick portion, so that energy is concentrated, and the ultrasonic waves of the tape end portion and the film Sealing can be performed reliably.
In the opening tape of this invention, since the edge part in the width direction can adhere to a film reliably, the range which can form an easily peelable seal becomes wide. In addition, if thick portions are provided at both ends in the width direction, the surface of the main body portion is less likely to be roughened when the tape is transported, so that damage to the first film 110 and / or second film 111 side of the tape is prevented and opened. The appearance of the packaging bag with tape is improved.

  Moreover, since the opening part of a bag will be in the state opened a little with the thickness of the thick part, it is easy to have at the time of opening, and becomes easy to open. Further, when the tape is wound from the thick part, blocking at the time of feeding due to tightening is reduced, and the tape is provided with rigidity, so that it is difficult to be deformed when wound up, and meandering at the time of feeding can be prevented.

  Furthermore, if there is a thick part at least on the opening side of the tape, the unsealing property can be improved. However, when the contents are taken out after opening, the contents are bitten by being caught between the tape and the film. In consideration of preventing the jamming, it is preferable to provide thick portions at both ends in the width direction of the tape.

In FIG. 1A, the thickness T1 of the main body 10 is preferably 50 μm to 300 μm. Since sealing is performed by interposing a tape of the width of the tape at a part of the two side seal portions that are not opened in the bag making process, if it is too thick, there is a possibility that a sealing failure may occur or the appearance may deteriorate.
On the other hand, if it is too thin, the tape drawn out from the bobbin is likely to be wound, and the suitability for bag making may be impaired.

  The width W1 of the main body 10 is preferably 5 mm to 30 mm. Although it depends on the size of the bag to be made, if the width is too wide, it is not preferable because the volume of the bag is reduced and the amount of film used is increased. On the other hand, if the width is too narrow, the width and position of the peel seal are limited, and seal accuracy is required or sufficient sealing performance cannot be obtained, which is not preferable.

It is preferable that the thickness of the surface layer 14 is selected so that the peeling starts when the seal edge breaks. Preferably it is 3-20 micrometers.
The thickness of the base material layer 12 is, for example, 40 to 280 μm.

In FIG. 1A, when the thickness T2 of the thick portion 20 is bonded to the first film using an ultrasonic seal, the ultrasonic horn and the anvil contact the main body portion 10 and the ultrasonic waves are not dispersed. And the thick part 20 is preferably high enough to be crushed. That is, it is made thicker by 10 μm to 1000 μm, more preferably 200 μm to 500 μm, more than the main body part 10.
The same applies to the case where the thick portion 20 protrudes on both sides of the main body 10 as shown in FIG. 1C.

  The width W2 of the thick part is preferably 300 μm to 2 mm. If it is too narrow, it is difficult to obtain sufficient adhesive strength. On the other hand, if it is too wide, sealing is performed by interposing a tape having a width of the tape at a part of the two seal portions that are not opened in bag making as described above.

  As shown in FIGS. 1A to 1C, the thick portion may have a rounded tip or a rounded shape. Further, as shown in FIG. 3, the cross section may be a quadrangle, a circle, an ellipse, a trapezoid, a bell shape, a triangle, or the like.

The materials for the surface layer and the base material layer are not particularly limited, and known materials can be used, and are appropriately selected in consideration of peelability and sealability. For example, polyethylene or polypropylene can be used.
Examples of the polyethylene include high density polyethylene (HDPE), low density polyethylene (LDPE), and linear low density polyethylene (LLDPE). Polyethylene can be properly used depending on the purpose. For example, when transparency is required and when an antifogging agent is kneaded, LDPE and LLDPE can be used, and when heat resistance is required, HDPE can be used.

  Examples of polypropylene include homopolypropylene (HPP), random polypropylene (RPP), and block polypropylene (BPP).

  The above polyethylene and polypropylene may be used alone or in a blend of two or more. Further, if necessary, an elastomer, a slip agent, an anti-blocking agent or the like may be added as a modifier.

Preferably, a soft thermal adhesive resin is used as the surface layer, and a hard resin is used as the base material layer.
The thick part can be formed of the same material as the base material layer and the surface layer.

Moreover, when it is set as the structure which consists of three layers which laminated | stacked the adhesion layer between the base material layer and the surface layer as an opening tape of this invention, re-adhesiveness can be provided after opening.
In addition, it is easy to control the peelability by disposing a resin having good peelability and breakability for easy opening in the adhesive layer.

  In this case, when the packaging bag is opened, the pressure-sensitive adhesive layer is peeled off at the interface with the base material layer or the surface layer, so that the pressure-sensitive adhesive layer is exposed or peeled off within the pressure-sensitive adhesive layer. When the packaging bag is closed, the exposed adhesive layer and the base material layer or the surface layer adhere to each other so that the packaging bag can be adhered again.

  The material of the adhesive layer is not particularly limited, and known materials can be used. For example, a styrene elastomer such as SIS (styrene / isoprene / styrene elastomer), a tackifier such as petroleum resin, a process oil, etc. The thing which added the plasticizer is mentioned.

  Moreover, you may make a main body part into the laminated body which consists of four layers. Preferably, the first layer (surface layer), the second layer (adhesive layer), the third layer (base material layer), and the fourth layer (base material side adhesive layer) are formed in order, and the first layer and the fourth layer are A soft thermal adhesive resin and a hard resin are arranged on the third layer.

  By using a soft resin for the first layer and the fourth layer, the heat sealability of the tape to the film can be improved, and by using a hard resin for the base material layer of the third layer, the tape can be opened at the time of opening. Does not stretch, the unsealing property can be improved, and the tape feeding property can also be improved.

  In addition, not only a main-body part but a thick part may be formed in a multilayer.

  The opening tape of the present invention is a method of co-extrusion of all the layers in a multilayer profile, a method of mono-layer profile extrusion of only the edges and extrusion lamination of all the surface layers, a multilayer profile co-extrusion of all the layers in multiple rows After that, it can be manufactured by a method of manufacturing by slitting, a method of thermally laminating a multilayer film while extruding only the end portion in a single row in a single layer, and subsequently manufacturing by slitting.

  The packaging bag of the present invention is obtained by bonding the opening tape of the present invention to the opening. At this time, as shown in FIG. 2, it is preferable to arrange so that the thick-walled portion of the tape and the first film are on the opening start side.

  A packaging bag is normally manufactured by the 1st process of adhere | attaching the base material layer side of a tape on a 1st film, and the 2nd process of adhere | attaching the surface layer of a tape on a 2nd film. The first step is preferably performed with an ultrasonic sealing device, and the second step is preferably performed with a heat sealing device.

For example, it manufactures by the method including the following processes.
(1) Pass the opening tape through the guide, and before the tape meanders, the first film and the base material layer of the tape are sandwiched between the first film forming the packaging bag and the tape with an ultrasonic horn and an anvil. (2) The process of heat-bonding the surface layer of the tape and the second film forming the packaging bag

The above method will be described with reference to FIG.
The opening tape 100 and the original film 110 (the first film of the first and second films facing each other forming the packaging bag) are sandwiched between the ultrasonic horn 140 and the anvil 130 and are ultrasonically sealed. Glued.

In order to clamp the base material layer side of the tape 100 to the original fabric film 110, the tape 100 is arranged so that the base material layer side is in the lower side in the figure.
A guide 120 for controlling the meandering of the tape 100 is provided in front of the ultrasonic horn. The guide 120 is not necessarily installed, but is preferably installed to control the meandering of the tape 100.

An ultrasonic horn (ultrasonic sealing device) is a sealing device used for bonding a thick portion to a film. Compared to a heat seal device that requires a device such as a large separator, it is small and removable, so it can be additionally attached to an existing automatic packaging machine.
Therefore, when the opening tape of the present invention is used, it can be easily opened or re-sealed by a general bag making machine that does not have a chuck tape specification, that is, a three-way bag making machine, a vertical pillow filling and packaging machine, a horizontal pillow filling and packaging machine, etc. Can produce a self-adhesive packaging bag.

  As shown in FIG. 5, the shape of the ultrasonic horn includes a horizontal tip, a two-tip tip, and a rotary horn. An ultrasonic horn with a horizontal tip is the most common, inexpensive and preferred.

  As the shape of the anvil, as shown in FIG. When the anvil is made into a roller shape, the tape is good and a commercially available rotating shaft can be substituted, so that the cost can be reduced.

  The tape guide controls the meandering of the tape. The material may be metal or synthetic resin, as long as the tape is not misaligned and the tape can be fed smoothly. As the shape of the tape guide, as shown in FIG. 7, a plate having a hole slightly larger than the cross-sectional shape of the tape, a pulley, and the like can be used.

  The distance between the tape guide and the ultrasonic horn is not limited as long as the tape does not meander until the tape is ultrasonically sealed, but ultrasonic sealing immediately after the tape guide outlet is preferable in terms of sealing stability.

  Examples of the positional relationship among the tape, the raw film, the ultrasonic horn, and the anvil are shown in FIGS. As shown in FIG. 8 (b), it is preferable that the ultrasonic horn, the raw film, the tape, and the roller-shaped anvil having the horizontal tip are in this order because the tape is difficult to stretch due to heat and a beautiful continuous seal can be formed.

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 non-axially stretched polypropylene, OPP is biaxially stretched polypropylene, and Ny is nylon.

  Next, the surface layer of the tape 100 and the other side of the original film 111 (the second film of the opposing first and second films forming the packaging bag) are applied to the heat seal bar 150 and the seal bar receiver. Heat-bond with 160.

  The apparatus for adhering the surface layer to the raw film 111 may be an ultrasonic sealing apparatus or a normal heat sealing apparatus. However, it is preferable to use a heat seal device rather than an ultrasonic seal device in order to securely bond the main body to the packaging bag by a peel seal line having a certain width.

  Thereafter, both sides and bottom sides of the original fabric films 110 and 111 are heat sealed to complete the packaging bag.

Example 1
(1) Manufacture of an opening tape The opening tape was manufactured by attaching the plate with the slit hole which becomes a desired tape cross-sectional shape to three extruders and the feed block for lamination. A cross-sectional view is shown in FIG.

The end thick part 210 was prepared using random propylene (random polypropylene Y-2045GP manufactured by Prime Polymer Co., Ltd.), and the width was about 400 μm and the thickness was about 400 μm.
The main body portion is composed of four layers of a base material side adhesive layer 220, a base material layer 230, an adhesive layer 240, and a surface layer 250.
The base material side adhesive layer 220 was produced using the same material as that of the end thick part 210, and the thickness was about 30 μm.
The base material layer 230 was produced using homopolypropylene (Homopolypropylene Y-2000GV manufactured by Prime Polymer Co., Ltd.), and the thickness was about 135 μm.

Adhesive layer 240 is 1 particle of 5: 5 compounded process oil (Idemitsu Kosan Diana Process Oil PW-90) and SEPS (Kuraray Septon 2004), 1 SIS (Nippon Zeon Quintac 3421), tackified It was prepared from a product obtained by dry blending the agent (Idemitsu Kosan Co., Ltd. Imabe P-125) and SEPS (Kuraray Septon 2004) at a weight ratio of particles 1 compounded at 7: 3. The thickness of the adhesive layer 240 was about 10 μm.
The surface layer 250 was manufactured using the same material as the end thick part 210, and the thickness was about 5 μm.
In this tape, the tape width was about 20 mm, and the thickness of the central portion in the width direction (the portion other than the end thick portion) was about 180 μm.

(2) Bag making The easy-open packaging bag was created with the bag making apparatus of FIG.
Using the opening tape 100 produced above, a dry laminate film of OPP (biaxially stretched polypropylene) 30 μm / CPP (non-axially stretched polypropylene) 30 μm was used as the raw film 110, 111.

The clearance between the ultrasonic horn 140 and the anvil 130 was 300 μm, and the distance from the guide 120 to the ultrasonic horn 140 was 100 mm. The output of the ultrasonic wave was 180W. An enlarged view of the ultrasonic horn 140 used in this embodiment is shown in FIG. 10, and an enlarged view of the guide 120 is shown in FIG.
A 20 mmφ shaft VSFJW manufactured by MISUMI Corporation was used as the anvil 130.

  Each time the film was fed at a pitch of 200 mm and 40 shots / minute, ultrasonic waves were transmitted by the ultrasonic horn 140 to continuously seal the base material side of the tape 100 to the original film 110. Only both ends in the width direction of the tape 100 were heat-sealed linearly in the original film traveling direction. Both ends in the width direction of the heat-sealed tape 100 were parallel and beautiful. The red penetrant was examined for pinholes at the seals at both ends of the tape, but no pinholes were generated.

The film 110 on which the tape 100 was heat-sealed and the film 111 were advanced between the heat-seal bar 150 and the seal-bar receiver 160, and the heat-seal bar 150 put a seal line almost at the center of the peeling portion.
As a result of the good adhesion between the tape 100 and the original film 110, the heat seal between the original film 111 and the peeled surface (surface layer 250) was able to accurately insert a seal line at the substantially central portion of the tape.
Further, side sealing was performed, and after heat-sealing two sides of the bag, the central portion of the side seal was cut to obtain a packaging bag.

Comparative Example 1
An easy-open packaging bag was prepared in the same manner as in Example 1 except that a tape having a thickness of 150 μm with no thick portions at both ends was used and the clearance between the ultrasonic horn and the anvil was 180 μm.
As a result, the tape and the original film were sealed only at a thick portion in the thickness distribution of the tape, and the result was insufficient because the tape was not necessarily sealed outside the opening side edge of the peel seal.

Comparative Example 2
An easy-open packaging bag was prepared in the same manner as in Example 1 except that a tape having a thickness of 150 μm with no thick part at both ends was used and the clearance between the ultrasonic horn and the anvil was changed to 160 μm.
As a result, although the tape was sealed over the entire width of the tape, the tape was squeezed and thinned, resulting in severe curling of the tape in the width direction.

  The opening tape and packaging bag of this invention can be used for food packaging, miscellaneous goods packaging, medicine packaging, and the like.

DESCRIPTION OF SYMBOLS 1, 3, 5, 100, 200 Opening tape 10 Main part 12 Base material layer 14 Surface layer 20 Thick part 30 Peeling seal 110,111 Original film 120 Guide 130 Anvil 140 Ultrasonic horn 150 Heat seal bar 160 Seal bar receptacle 210 End part thick part 220 Substrate side adhesive layer 230 Base part layer 240 Adhesive layer 250 Surface layer T1 Thickness of main part T2 Thickness of thick part W1 Width of main part W2 Width of thick part

Claims (6)

A main body, and at least one end in the width direction of the main body having a thicker portion thicker than the thickness of the main body,
The opening tape in which the said main-body part contains at least 2 layer of a base material layer and a surface layer, and the surface layer side is peelable from the base material layer side.   The opening tape of Claim 1 which has a thick part in the both ends of the width direction of the said main-body part.   The opening tape according to claim 1 or 2, wherein the main body includes an adhesive layer between the base material layer and the surface layer.   The manufacturing method of a packaging bag including the process of heat-bonding the thick part of the opening tape in any one of Claims 1-3 to the film for packaging bags with an ultrasonic horn and an anvil.   The manufacturing method of the packaging bag according to claim 4, wherein a tip of the ultrasonic horn is parallel to the opening tape, and the anvil is in a roller shape.   The packaging bag which has the opening tape in any one of Claims 1-3 in an opening part.

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