WO1989009730A1

WO1989009730A1 - Method and apparatus for bonding tear-open system to packaging film in tape form

Info

Publication number: WO1989009730A1
Application number: PCT/JP1989/000364
Authority: WO
Inventors: Hirokazu Ishikawa; Hirofumi Watanabe; Tetsuo Iizuka
Original assignee: Honshu Sangyou Kabushiki Kaisha; Honshu Seishi Kabushiki Kaisha
Priority date: 1988-04-05
Filing date: 1989-04-05
Publication date: 1989-10-19
Also published as: JPH01267138A; JPH0579570B2

Abstract

This invention relates to a method and apparatus for bonding a twisted yarn (30) consisting of thermoplastic fibers to the inner surface of a packaging film (2a) in the tape form in place of a conventional cut tape (tear tape) by use of a ultrasonic sealing apparatus (10) or a high frequency sealing apparatus.

Description

Specification

Name of the invention

Tape the opening thread against the packaging film

Method and device for bonding in a shape

Technical field

The present invention mainly relates to a plastic package made of synthetic resin inside a package (hereinafter, referred to as a film package) which is applied to overwrapping packaging, which is made of a thermoplastic fiber for facilitating opening of the package. The present invention relates to a method of bonding a packaging film in a flat tape shape by using an ultrasonic sealing device or a high frequency sealing device before or during packaging of a product, and a device therefor.

Background technology

Sweets such as cigarettes and other sweets or chocolate containing chocolate are often packaged individually or collectively in a transparent synthetic resin film (hereinafter referred to as “figures”). It is used for the purpose of adding cosmetics to products in addition to protecting the contents, and thereby stimulating demand. However, for the convenience of opening these film packages and taking out the products inside, the film is generally provided with a cut tape so that the film can be easily opened. I have.

However, these cut tapes (also known as tear tapes)

① Material such as polyester and moisture-proof cellophane Using the film,

② After coating or laminating a hot-melt adhesive or pressure-sensitive adhesive on one side of this film,

③ Cut to predetermined narrow width by slitter,

After the above processing steps, the raw film is converted into tape form and supplied as a product. As a result, the cost of the tape increases, and the cost is reduced.

ππ was required

The summary of the present invention is that, instead of using the above-mentioned force tape, a crimped yarn or a non-crimped yarn made of a thermoplastic fiber is used as a material, and the crimped yarn or the non-crimped yarn is applied to the surface of the packaging film by ultrasonic waves. The sealing film or the high-frequency sealing device is used to flatten and weld while welding, but the packaging film is a shrink film, and the opening yarn is composed of a crimped yarn. One of the present applicants has previously proposed a method using a hommelt adhesive as a means for adhering the two, as disclosed in JP-A-62-28354. However, as a result of subsequent research and development, the method of bonding the opening yarn to the shrink film using the hot melt adhesive or the like as described in the above-mentioned prior art is based on the step of applying a bonding agent or the like. A separate coating device must be added, and the hot melt adhesive must be cooled after application, which increases operating speed. It turned out to be a bottleneck in. In addition, the above-described adhesive causes the mechanical device to be soiled, and the heating process for heat sealing causes the opened yarn to be separated (peeled) from the film due to the melting of the adhesive and the packaged material to be stained. Due to problems, although it is a satisfactory method in terms of operability, strength and strength o

Here, the present invention relates to a method for bonding an opening yarn for opening a film package to one surface of a thermoplastic resin film, wherein a plurality of crimped yarns or non-crimped yarns of thermoplastic fibers are used. The converged single yarn or ply-twisted yarn is used as the material for the opening yarn, and the braces are applied to one surface of the thermoplastic resin film at a certain width using the ultrasonic sealing method or the high frequency sealing method. In addition, the above-mentioned problem is solved by making the adhesive flat.

Disclosure of the invention

The film for packaging used in the present invention is uniaxially or biaxially stretched such as polyethylene, polypropylene, polyester, polyvinyl chloride, polyvinylidene polychloride, and moisture-proof cellophane. Known thermoplastic resin films can be used.

In many cases, these films are used in such a way that they are attached to an opening thread and then wrapped in an overwrapping machine.In such a case, after packaging the goods to be packaged, At least one side of the film must be a heat-sealing film to heat seal the seam Is desirable.

As the material of the opening yarn used in the present invention, a thermoplastic synthetic fiber such as polyethylene, polypropylene, polyester, nylon or polyvinyl alcohol or a sheath-core type thermoplastic composite fiber is used, and the yarn itself is used. Is a stable fiber composed of crimped yarn or non-crimped yarn in which 20 to 150 L0 denier thermoplastic fibers are converged at least from a thickness of 2 to 150 filaments, and a single fiber of Z or filament. Yarn or combustible yarn. The crimped yarn has been subjected to a so-called crimping process of twisting the 20-150 converged fiber bundle to the left and right at high speed many times. The non-crimped yarn is obtained by not crimping the 20 to 150 convergence fiber bundles. Both the crimped yarn and the non-crimped yarn are used in the present invention after a plurality of the fiber bundles are twisted (30 to 500 times Zm).

According to the present invention, the converging yarn is subjected to milling or crimping as described above to reduce the apparent thickness as compared with a mere converging yarn, and to target an opened yarn having such a configuration as to achieve an ultrasonic wave. By applying a seal or a high-frequency seal, the points of contact between the fibers constituting the yarn and the points of contact between the fibers and the film are each kept flat while forming a discontinuous point-like adhesive state. The flatness of the unsealing thread can be changed by adjusting the pressing force of the welding horn or the welding roller in the ultrasonic sealing device or the high frequency sealing device. In the present invention, various synthetic resin films can be used as the packaging film as described above, and a yarn made of various thermoplastic fibers is also used as the opening yarn. However, the following combinations are preferred in consideration of the compatibility between the packaging film and the yarn.

For example, it is preferable to use the same type of resin for the synthetic resin forming the packaging film and the thermoplastic fiber forming the yarn, and the following combination of the film and the yarn is preferable.

Polynole yarn Polyvinyl chloride Composite fiber consisting of polyvinyl chloride sheath and polyester core Polyvinylidene chloride Same as above

Dampproof cellophane Same as above

Composite fiber whose sheath is made of polyethylene and whose core is polyethylene propylene The ultrasonic sealing method or high frequency sealing method used in the present invention basically uses an ultrasonic sealing device or a high frequency sealing device which is generally known. Although it can be used, in the present invention, it is necessary to provide at least a welding pressure adjusting mechanism and a sliding mechanism for the welding horn or the welding roller.

The reason why the present invention particularly employs the ultrasonic sealing method or the high-frequency sealing method is that a yarn made of thermoplastic fiber is used as a packaging film. Ultrasonic or high frequency welding of the yarn to the film to adhere to the tape and form a tape, coupled with the thickness of the yarn by adjusting the ultrasonic or high frequency pressing force and increasing the frequency, This is because the width of the tape-shaped opening thread after bonding can be freely adjusted.

The width of the tape-shaped opening yarn adhered flat according to the present invention can have a desired width by adjusting the thickness of the yarn and the pressure and frequency of the ultrasonic or high-frequency sealing device as described above. Yes, but practically 0.1 to 5 dragons are possible, and can have the same width, shape and appearance as conventional opening tapes.

For example, for a narrow one, a crimped yarn with a thickness of 50 denier and a width of 0.5 can be obtained, and for a wide one, if the pressure of the sealing device is increased with a total of 360 deniers of the yarn thickness, It can be up to 5 mm wide.

In addition, the conventional opening tape is usually a colored tape, but in the present invention, without printing, a desired coloring agent is kneaded or dyed into the material thread to form a tape of various colors. It can be bonded as an opening thread.When multiple converging yarns are burned together, twisting yarns of different colors will mix various colors in any combination such as red and white, blue and green A tape-shaped opening thread with a pattern can be used.

Also, if the tape-like opening thread is to be filled with gold or silver wire In this case, a tape-shaped opening thread containing gold and silver wires of the desired width is obtained by superimposing a thin thread colored gold or silver on a thick thread and bonding it to the film. Can be.

Further, the feature of the method and the device of the present invention is that when the yarn is bonded to the film by the ultrasonic sealing device or the high frequency sealing device, the welding horn or the welding roller of the sealing device and the receiving roller are slid left and right. It can be adhered to the film surface in a wavy or curved line, and a curved opening tape can be obtained.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a plan view schematically showing a yarn made of a thermoplastic fiber used as a material for the opening yarn of the present invention, FIG. 2A is an enlarged cross-sectional view of the yarn, and FIG. 2B is a thermoplastic composite fiber. Fig. 3 is a perspective view showing an example of an apparatus for manufacturing an overwrapped film package, and Fig. 4 is a perspective view of the film package manufactured in Fig. 3. FIG. 5A is a perspective view showing an example of an enlarged overwrapped film package, FIG. 5A is a side view showing an example of a device for bonding a film and a yarn by an ultrasonic sealing method, and FIG. Fig. 6A is a side view of the receiving roller support portion of the ultrasonic sealing device, Fig. 6B is a front view of the same, Fig. 6C is a cross-sectional view of a part of the thread guider, and Fig. 7 is FIG. 8 is a front view showing the high frequency welding apparatus, and FIG. Fig. 9 is a cross-sectional view showing a state in which the opened thread has been flattened, and Fig. 10A is the degree of overlap between the film and the thread. FIG. 10B is an enlarged longitudinal sectional view showing a state where the sheet is flattened by applying pressure to form a tape.

BEST MODE FOR CARRYING OUT THE INVENTION

The method and the apparatus for bonding the opening thread of the present invention to the packaging film in the form of a tape will be specifically described with reference to examples.

FIG. 1 schematically shows an opening thread used in the present invention. As shown in FIG. 1, the opening thread 30 is obtained by twisting fiber bundles 31a and 31b. For example, polypropylene is used as a raw material, and this is melt-spun through a spinning nozzle in a state of 30 fiber bundles 31a and 31b to obtain a 3-denier single fiber.

Each of the fiber bundles 31a and 31b shown in FIG. 2A is burned three times to the left and right, respectively, and then crimped. The two bundles thus obtained are further twisted 100 times, and when they are twisted, 60 single fibers are united to obtain a burned yarn 30. In this case, the total thickness of the yarn is 180 denier. Incidentally, it is a matter of course that the single fiber spun from the nozzle and subjected to crimping may be converged. The form of the material fiber may be a continuous long fiber, or a spun fiber cut into an appropriate length to obtain a stable fiber.

FIG. 2B schematically shows fiber bundles 31a and Elb using a heat-adhesive conjugate fiber having a sheath-core structure as a single fiber.For example, the sheath is polyethylene, and the core is polypropylene or polyester. The sheath is made of polyvinyl chloride, This is the case where the other core is made of polyester or the like. Thus, when the yarns composed of these composite fibers are welded by ultrasonic or high frequency welding, the resin of the low melting point sheath is welded and flattened, while the resin in the high melting point core is flattened. It can be used as a skeletal structure to create a strong tape-shaped opening thread.o

FIG. 3 is a view showing a state in which the opening yarn made of the thermoplastic fiber of the present invention is flatly adhered to a film for packaging to form a tape, and the article to be packaged (commodity) is put on the film with the tape-shaped opening yarn. This shows the processing steps for producing a film package by wrapping. In other words, the device for bonding the opening thread of the present invention to a film in the form of a tape is overwrapped and incorporated into an automatic packaging machine. That is the case.

In FIG. 3, as an example, a 20-m-thick strip-shaped polypropylene propylene film 2b (to which a heat-sealing property has been given in advance) is film-wound 2a. On the other hand, an opening thread 30 for welding to the film surface is unwound from the bobbin 34 at the same speed as the film, and both of them are an ultrasonic screen forming an essential part of the present invention. -It is guided to the control device 10 and united. Incidentally, the opening thread 30 is introduced into the sealing device while maintaining a very loose tension state via a tension control roller 35 shown in the preceding stage of the sealing device. In addition, in order to feed out the opening thread at the same speed as the film, it is linked with the film drive. It is preferable to install a forced supply port in front of the tension control port 35.

The details of the ultrasonic sealing device 10 and the mode of bonding by the ultrasonic sealing device 10 will be described later. However, the opening thread 30 having a total thickness of 180 denier described above by the device 10 is provided on one side of the band-shaped film 2b.

(The inside of the film after the film is wrapped). As an example of the bonding conditions, the bonding speed is 40 mZ, the ultrasonic frequency is 27,000 Hertz, the applied pressure is 2 kg Z cif, and the bonded yarn 30 is flattened and the tape is opened. It becomes 4. After the ultrasonic sealing device, a sensor that detects the tape-shaped opening yarn and detects the yarn breakage

(Optical sensor using optical fiber) _{c The} band-shaped film 2b on which the tape-like opening thread 4 with the installed 20 has been installed is passed through the guide roll, and usually under the online condition, tobacco or carton. Enters an overwrapping machine, which is an automatic packaging machine used for collation and the like. That is, a U-shaped knob 5a and a notch 5b corresponding to the knob are provided centering on the tape-shaped opening thread 4 by the notch cutter 70a and the receiving blade 70b forming the cut end, and The film with the cut is fed into the force-feeding device via film feeding rolls 71a and 71b. The cutter includes a rotary blade 72a and a receiving blade 72b. After the film is cut to a length necessary for packaging the product in a direction perpendicular to the film flow, the following process is further performed. Through the packaging file Operate so that it is wrapped in the system 2b. That is, as shown by reference numerals 60 and 61 in the figure, after the product 3 is wrapped in the film 2 and then attached to the body while being turned 180 °, the top and bottom are further folded and a heat seal is performed. Thus, the film package 1 provided with the tape-like opening thread 4 is obtained. As the film, it is acceptable to use a film that can be heat-sealed at a relatively low temperature of about 110 to 150 ° C.

FIG. 4 is an enlarged view of the film package 1 constructed as described above. As is apparent from the figure, the product 3 is wrapped in the packaging film 2 with the top and bottom and the side of the body being heat sealed, and the tape-shaped opening thread 4 for easy opening is provided. Since it is adhered to the inner surface of the packaging film 2 with the knob 5a, it is configured so that this portion can be easily opened by pinching it with a finger.

Proceeding now, an ultrasonic sealing device (a portion indicated by reference numeral 10 in FIG. 3) used in the present invention and a method of bonding yarns to form an opening tape by the device will be described. FIG. 5A is a side view showing the entirety of the ultrasonic sealing device 10 of the present invention, and FIG. 5B is a front view of the right device viewed from the right.

The overall configuration of the apparatus is centered on a portion centered on the welding horn 42 mounted on the upper part of the film 2b running horizontally in the figure and a receiving roller 47 positioned on the lower part of the film 2b. And the upper welding horn is An oscillator 41 fixed to a machine frame 40, and a welding horn 42 attached to the lower surface of the oscillator 41, and the machine frame 40 is mounted so as to be pressurized downward by an Eanlinder 43 as an example. Have been. The entire upper device including the air cylinder 43 is mounted via a support frame 44 so as to be slidable laterally (in a direction perpendicular to the running direction of the strip film 2b). That is, the support frame 44 is suspended around a fixed inner rod 45 and is attached so as to screw together with a screw rod 46 provided between the guide rods 45, 45. When the operation handle 46a (shown by a chain line in the figure) provided on the frame 44 is rotated, the entire machine frame 44 can be moved rightward or leftward via the screw rod 46 with the rotation.ぉヽ o

Subsequently, the receiving roller portion located below the welding horn portion will be specifically described with reference to FIGS. 6A to 6C.

A receiving roller 47 is provided on the lower surface of the welding horn 42 so as to face the horn, and the receiving roller 47 is moved in a longitudinal direction of the shaft by a screw 52 with respect to a fixed shaft 51. On the other hand, as shown in FIG. 6C, a thread guide 50 made up of a pair of two clamp members 50a and 50b is incorporated into the peripheral surface of the receiving roller 47 as shown in FIG. 6C. That is, semi-circular curved surfaces 50c, 50c corresponding to the circumferential surface of the receiving roller 47 are provided on the upper side of each of the clamp members. The thread guide is attached so as to sandwich the receiving roller 47 between these curved surfaces. Stop holes 50d, 50d are respectively formed on the base end sides of the clamp members 50a, 50b so as to face each other, and one common coil spring 55 is fitted into the bracket hole.揷Further, a set screw 54 for setting the pair of members to each other is attached to the center of the clamp members 50a and 50b, and as shown in FIG. 6C. Thus, one clamp member 50a has a through hole 50e having a diameter large enough to allow the screw to fit loosely, and the other clamp member 50b has a screw hole 50f into which the set screw 54 is inserted. Are formed, and the set screw 54 is screwed through the through hole 50e and the screw hole 50f. In this case, when the screw 54 is strongly tightened, the two clamp members approach each other against the elasticity of the coil spring 55, and are firmly gripped by the receiving roller 47 via the curved surface of the member. You. On the other hand, when the set screw 54 is loosened, the two clamp members 50a and 50b move in the directions away from each other due to the elasticity of the spring 55, thereby changing the position of the clamp member with respect to the receiving roller 47, Or it can be easily removed.

A thread guide roller 36 for guiding the thread 30 guided from the thread bobbin 34 in FIG. 3 to the upper surface of a receiving roller 47 is attached to the thread guide 50 made up of both clamp members. A guide groove 53 for guiding the yarn 30 passing through the roller to the receiving roller surface is formed, and a cover plate having a long hole 57 so as to cover the guide groove from above. 6A is mounted in a semi-fixed state via a thumbscrew 58 so that it can move in the left-right direction in FIG. 6A.

Thus, the yarn 30 fed out through the guide roller 36 reaches the upper surface of the receiving roller 47 through the guide groove 53 formed on the surface of the clamp member 50a, where the welding horn 42 It is welded to the surface of the film 2b by the ultrasonic energy and the pressing force from it, and becomes a tape-shaped opening thread 4 while deforming flat. Incidentally, the cover plate 56 is a member for preventing the thread from coming off the guide groove. When threading, the thumb screw 58 may be loosened and the cover plate 56 may be shifted to the side.

By the way, when the yarn is welded by the ultrasonic seal, the surface of the receiving roller 47 is abraded little by little, and especially when the welding is repeated at the same location, the surface of the mouth-roller is damaged, and the May not be able to perform the welding work. In the present invention, taking this point into consideration, the thread guide 50 made of the above-mentioned clamp member can be moved in the axial direction of the roller on the peripheral surface of the receiving roller so that it can be moved at the same location. This is to prevent frequent welding. The welding horn 42 can be moved in the same direction in accordance with the movement of the thread guider. What we can do is already mentioned. In order to move the thread guider 50 in the axial direction, first, the set screw 54 is loosened. At that time, the elasticity of the spring 55 acts as described above, and the two clamps 50a and 50b constituting the guider move in the opening direction. Then, the spring 55 is contracted by grasping the base end side of the clamp by hand, and the upper sides of both clamps are opened in a C-shape accordingly (see FIG. 6C). Thus, the movement of the thread guider can be easily performed.

The bonding conditions for bonding a non-crimped yarn or a crimped yarn made of a thermoplastic fiber to a belt-like film in a tape shape using the ultrasonic sealing device of the present invention depend on the thickness of the yarn and the material of the yarn. Different forces depending on the type of thermoplastic fiber or the bonding speed The amplitude of the ultrasonic wave is 20 ~ 50 ^ m, the frequency is 15000 ~ 30000 hertz, and depending on the ultrasonic sealing device, for example, Japan Fuchuya ( Using HW-40 manufactured by Co., Ltd., the yarn is melted and flattened by applying an amplitude of about 20 m, a frequency of 60,000 Hz, and a pressing force of l ~ 3 kg / (^), and a tape-like surface is formed on the surface of the finale. Can be welded.

It is necessary that the film speed and the yarn feeding speed be the same speed.For yarn feeding, use a forced feeding roll derived from the drive of the film, and set the yarn speed and film speed to the same speed. Faster is preferred.

Also, if the yarn is over-tensioned, it will break when glued. Therefore, the tension is controlled by a tension controller.When the tension is applied, for example, a tension of about 1 to 3 g is applied to the receiving roller 47 so that there is no slack. It is necessary to feed the yarn.

The bonding speed can be variously changed, but is set to about 5 to 100 mZ.

The embodiment shown in FIGS. 7 and 8 shows a case where a high-frequency sealing device is used instead of the ultrasonic sealing device 10, and the same members as those in FIG. 5 are denoted by the same reference numerals. The different members will be described below.

This figure is similar to the positional relationship between the welding horn 42 and the receiving roller 47 in the ultrasonic sealing device shown in FIG. 5A. In both the high frequency sealing device and the ultrasonic sealing device, the device centering on the welding horn 42 and the receiving roller 47 may be arranged upside down.

A roller denoted by reference numeral 65 in FIG. 7 is a welding roller for forming one negative electrode, and the other positive electrode is disposed below the yarn 30 to be welded and the band-shaped film 2b. A receiving port 66 is formed.

In addition, both the welding port 65 and the receiving roller 66 are attached to the handles 67 and 68 via the insulator 69, and a large number of 66a is protruding. Incidentally, reference numerals 63 and 64 are brushes or copper plates for energization. The mechanism of the ultrasonic sealing device and the high frequency sealing device used in the present invention and the method for bonding the opening yarn made of thermoplastic fiber to the packaging film in a tape shape have been described above.

Here, the mechanism by which the opening yarn made of the thermoplastic fiber of the present invention is formed into a flat tape shape by the ultrasonic sealing device or the high frequency sealing device will be schematically described with reference to the drawings.

As shown in Fig. 9, the structure when the opened yarn is flatly adhered to the film with an ultrasonic seal or the like is the contact point between the fibers constituting the yarn and the contact point between the fiber and the film. Are flattened together with discontinuous points. As shown in FIG. 10A, this flattening is performed by increasing the pressure of the welding horn or the welding roller by increasing the pressing force of the welding horn or the welding roller. Can be attached to b.

In the present invention, it is desirable to adopt a method of adhering a tape-shaped opening thread to the film surface with a constant width. For this purpose, for example, it is conceivable to provide the following adjustment mechanism in the ultrasonic sealing device.

(1) The running speed of the film and the conversion of the frequency or amplitude of the ultrasonic wave are linked, and the power control of the ultrasonic wave is performed in response to the change in the running speed of the film, and the welding and flattening of the yarn are uniform. Into a tape-shaped opening thread of a certain width.

(2) Film running speed and welding horn of ultrasonic sealing device By controlling the pressing force in response to changes in the running speed of the film, the welding and flattening of the yarn are made uniform, and a tape-shaped unsealed yarn with a constant width is produced.

(3) The ultrasonic horn has a constant clearance between the end face of the welding horn and the film surface of the ultrasonic sealing device, and controls the upper and lower width of the machine frame equipped with an air cylinder that moves the welding horn up and down. The flattening is made uniform to obtain a tape-shaped opening yarn with a fixed width.

By these means, it is possible to reduce the loss due to the fluctuation of the width of the tape-shaped opening thread when the operation is stopped or when the operation is stopped.

Industrial applications

When the opening yarn of the present invention is adhered to a packaging film in a tape form, the following effects can be obtained.

Unlike conventional tapes (tape tapes), there is no need for printing, adhesive coating, or narrow-width cutting processes. Thermoplastic fiber yarns are directly bonded to the packaging film in a tape form. However, it is possible to obtain a packaging film similar to a packaging film to which a conventional cut tape is adhered by a simple process, and to achieve a significant cost reduction.

(Mouth) Since the combination of the thermoplastic resin film for packaging and the resin composition of the yarn comprising the thermoplastic fiber can be selected, the compatibility between the film and the opened yarn is excellent. Especially when the thermoplastic composite fiber yarn used in the present invention is used In addition, a tape-like opening yarn with good strength can be obtained.

When a device for bonding the opening thread of the present invention to a packaging film in a tape shape is used, the following effects are exhibited.

Π) By increasing the pressing force of the welding horn or welding roller of the ultrasonic sealing device or high-frequency sealing device, the thermoplastic fiber yarn can be flatly bonded to the packaging film, and the tape of the desired width It can be a tear-open thread.

(2) The ultrasonic sealing device or the high-frequency sealing device includes a welding mechanism for adjusting a set position of each of the members at least in a device portion including a welding horn or a welding roller. Therefore, the yarn can be adhered to the film in a straight line. In addition, if the yarn is constantly slid by a motor or the like, the yarn can be adhesively adhered in a curved, constant width, and flat to form a tape-shaped opening yarn.

(3) The receiving roller in the ultrasonic sealing device of the present invention is capable of restricting the position of action of the roller via the thread guide that can move in the pulling direction. Abrasion caused by welding of the yarn on the roller surface can be dispersed on the entire peripheral surface of the roller. As a result, it has the advantage of withstanding long-term use.

The thread guider is composed of a pair of clamp members, and a set screw and a spring incorporated in the pair of clamp members. This makes it possible to move on the one side of the receiving port with the touch of a button.

(4) By incorporating the device of the present invention into a packaging machine, a bag making machine, a film half-fold winding machine or a similar processing machine, the opened yarn is formed into a tape in accordance with each production speed. Can be attached.

The opening thread of the present invention has the following advantages.

(a) Unlike conventional cut tape, a thread made of thermoplastic fiber is directly welded to the film to form a tape, so film printing and adhesive coating required for the manufacture of conventional tapes are performed. This eliminates the need for machining and narrow-cut cutting processes, making it much cheaper. Also, unlike the conventional cut tape, since no adhesive is used for bonding to the film, there is no worry about troubles such as blocking, shrinking of the film, curling, and the like.

(b) When a tape-shaped opening thread requires a narrow width, the total denier is reduced, and when a wide tape is required, a thread having a larger total denier may be used. By adjusting the pressing force, a tape-shaped opening thread having the same width as that of the conventional tape can be freely obtained.

(c) The use of a single-core sheath-core type heat-adhesive conjugate fiber composed of two or more thermoplastic resin It is possible to obtain a tape-shaped opening yarn having excellent adhesiveness and strength.

(d) The conventional colored cut tape is colored by a printing method.However, the coloring of the opening yarn of the present invention is carried out at the time of manufacturing the yarn, especially by incorporating a coloring agent into the material resin. If the colored yarn is used, a patterned tape-shaped opened yarn obtained by twisting single-color or different-color yarns can be obtained. Furthermore, if the thin thread is colored with gold or silver, and this is overlaid on a thick colorless thread and adhered, a tape-shaped opening thread containing a gold wire or a silver wire can be obtained freely.

Claims

In a method of bonding an opening yarn for opening a film package to one surface of a thermoplastic resin film, a single yarn or a plied yarn in which a plurality of crimped or non-crimped thermoplastic fibers are converged. The opening thread, which is characterized in that it is bonded to one side of a thermoplastic resin film in a flat tape shape using an ultrasonic sealing method or a high-frequency sealing method, is bonded in a tape shape to a packaging film. how to.

2. The thermoplastic fiber according to claim 1, wherein the thermoplastic fiber is a thermoplastic synthetic fiber selected from polyethylene, polypropylene, polyester, nylon, vinyl chloride, and polyvinyl alcohol, or a sheath-core type thermoplastic composite fiber. A method of adhering the opening yarn described in the above to a film for packaging in a tape shape.

The single yarn or ply-twisted yarn is a stable and / or filament composed of crimped or non-crimped yarn in which 20 to 150 thermoplastic fibers having a thickness of 2 to 10 deniers of single fiber are converged. A method for bonding the opening thread according to claim 1 to a packaging film in a tape shape.

2. The unsealing thread according to claim 1, wherein the ultrasonic sealing method is performed using an ultrasonic sealing device under conditions of an ultrasonic wave amplitude of 20 to 50 m, a frequency of 15,000 to 60,000 Hz / sec, and a pressure of 1 to 3 kg / cif. Is a method of bonding tape to a packaging film.

2. The packaging yarn according to claim 1, wherein the width of the packaging yarn adhered in a flat tape shape is 0.1 to 5 mπι. A method of bonding in a tape form.

A film in which a thermoplastic resin film is stretched uniaxially or biaxially from polyethylene, polypropylene, polyester, polyvinyl chloride, polyvinyl chloride, and moisture-proof cellophane 2. The method according to claim 1, wherein the opening thread is adhered to the packaging film in a tape form.

In an ultrasonic sealing device or a high-frequency sealing device for adhering an opening thread for opening a film package in a tape shape to one surface of a thermoplastic resin film, a welding horn or a welding port and a receiving hole thereof are provided. The roller is mounted so as to be able to move relative to the base in the width direction of the film, and the pressure applied to the film surface of the welding horn or the welding roller can be adjusted via a cylinder. A device for attaching an opening thread to a packaging film in the form of a tape.

In an ultrasonic sealing device in which an opening thread for opening a film package is adhered in a tape shape to one surface of a thermoplastic resin film, the peripheral surface of a receiving roller in the device is slid in the axial direction of the roller. 3. The packaging film according to claim 2, further comprising a thread guide that is movable, and a guide groove for guiding the thread directly below the welding horn. Equipment for bonding in a shape.

A yarn guide is constituted by a pair of two clamp members facing each other, and the base ends of the two members are slid. A retaining member is always held in such a manner as to be separated from each other by a plier. On the other hand, a hole into which a set screw is loosely fitted is provided in one of the two members, and a hole through which the set screw is screwed is formed in the other member. 4. The apparatus for bonding an opening thread to a packaging film in a tape form according to claim 3, wherein the apparatus is set so that the clamp member can be opened by a screw.

Thermoplastic fibers with a monofilament thickness of 2 to 10 denier

The opened yarn according to claim 1, which is a staple made of crimped yarn or non-crimped yarn and a single yarn or ply-twisted yarn of Z or filament, for a film for packaging. Opening thread used for tape-like bonding.

6. The tear-open yarn according to claim 5, wherein the resin component constituting the single fiber is a single-component thermoplastic fiber or a thermoplastic composite fiber composed of a plurality of resin components.