JP2023178963A - Packaging material and manufacturing method of the same - Google Patents

Abstract

To provide a packaging material which can fix a heat-shrinkable film to a mount without using an adhesive agent.SOLUTION: A packaging material 1 includes: a mount 110 in which a thermofusion thin film 110b is provided on one surface; and a heat-shrinkable film 100 disposed on the one surface and having a storage space for storing a packed object. The heat-shrinkable film 100 is fixed to the thermofusion thin film 110b of the mount 110 by ultrasonic welding. The structure can provide the packaging material which can fix the heat-shrinkable film to the mount without using an adhesive agent.SELECTED DRAWING: Figure 1

Description

The present invention relates to a packaging material and a method for manufacturing the packaging material.

2. Description of the Related Art Packaging materials are known in which a heat-shrinkable film for wrapping an object is fixed in advance to a mount using an adhesive. Prior documents disclosing the structure of this packaging material include JP-A No. 08-244832 (Patent Document 1), JP-A No. 2012-121590 (Patent Document 2), and JP-A No. 2014-12539 (Patent Document 1). 3) etc.

Japanese Patent Application Publication No. 08-244832 Japanese Patent Application Publication No. 2012-121590 JP 2014-12539 Publication

The configurations of the packaging materials disclosed in each of the above-mentioned patent documents have the following problems. 1) When applying hot melt as an adhesive to a backing paper, there was a problem in that the hot melt strings formed and adhered to the backing paper. For this reason, an inspection process was required to check for the occurrence of stringiness.

2) It is necessary to firmly adhere the heat-shrinkable film to the mount. Therefore, an aging time for reaction was required after applying the hot melt. Before aging, the hot melt adhesive force was weak, so there was a problem that misalignment occurred between the heat-shrinkable film and the mount.

3) There were restrictions on the position when attaching the heat-shrinkable film to the mount. When a heat-shrinkable film was fixed to the edge of the mount, there was a risk that the hot melt would protrude from the mount. Therefore, depending on the combination of the mount and the packaged item to be wrapped in the heat-shrinkable film, the heat-shrinkable film may have to be attached at a position protruding from the mount. In this case, the heat-shrinkable film comes into contact with the box during transportation, causing the heat-shrinkable film to bend or cause wrinkles.

The present invention has been made to solve the above problems, and aims to provide a packaging material and a method for manufacturing the packaging material that can fix a heat-shrinkable film to a mount without using an adhesive. purpose.

The packaging material according to the present invention includes a mount provided with a heat-fusible thin film on one side, and a heat-shrinkable film disposed on the one side and having a storage space for accommodating an item to be packaged. The shrinkable film is fixed to the thermofusible thin film of the mount by ultrasonic welding.

In the packaging material according to one embodiment of the present invention, the accommodation space is defined by making the heat-shrinkable film into a cylindrical shape, and the heat-fusible thin film An ultrasonic welding area between the heat-shrinkable film and the heat-shrinkable film is provided.

In the packaging material according to one embodiment of the present invention, in the direction in which the cylindrical housing space extends, at least one end of the heat-shrinkable film has a non-welded area where the ultrasonic welding area is not applied. It is provided.

The method for manufacturing a packaging material according to the present invention includes the steps of preparing a mount provided with a heat-fusible thin film on one side, and a storage space disposed on the one side and including an opening for accommodating an item to be packaged. and a step of welding the heat-shrinkable film and the heat-fusible thin film using ultrasonic waves while maintaining the opening and the accommodation space. .

According to the present invention, it is possible to provide a packaging material and a method for manufacturing the packaging material that can fix a heat-shrinkable film to a mount without using an adhesive.

FIG. 2 is a front view showing the configuration of the packaging material of Embodiment 1. 2 is a cross-sectional view corresponding to the line II-II in FIG. 1. FIG. FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1 of another embodiment. FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1 of yet another embodiment. FIG. 2 is a front view of a state in which an object to be packaged is housed in the packaging material of Embodiment 1; FIG. 2 is a perspective view of the packaging material of Embodiment 1 after the packaged item is housed and the heat-shrinkable film is heat-shrinked. 7 is a sectional view taken along the line VII-VII in FIG. 6. FIG. FIG. 7 is a cross-sectional view corresponding to the line VII-VII in FIG. 6 in a comparative technique. FIG. 7 is a front view showing the configuration of a packaging material according to a second embodiment. FIG. 7 is a front view of a state in which the packaged items of Embodiment 2 are accommodated. FIG. 7 is a front view showing the configuration of a packaging material according to Embodiment 3. FIG. 7 is a front view showing the configuration of a packaging material according to a fourth embodiment. FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1, showing the structure of a packaging material according to a fifth embodiment. FIG. 7 is a perspective view of a state in which an object to be packaged is housed in a packaging material according to a sixth embodiment. A sectional view corresponding to the XV-XV line arrow view in FIG. 14 before the packaged items are accommodated. FIG. 3 is a plan view of a tip of a horn that can be used in the embodiment. 17 is a partial cross-sectional view showing the horn convex portion corresponding to the XVI-XVI line arrow in FIG. 16. FIG.

Packaging materials of each embodiment based on the present invention will be described below with reference to the drawings. In the embodiments described below, when referring to the number, amount, etc., the scope of the present invention is not necessarily limited to the number, amount, etc. unless otherwise specified. Identical or equivalent parts will be given the same reference numbers, and duplicate descriptions may not be repeated. It has been planned from the beginning to use the configurations of the respective embodiments in appropriate combinations. In the drawings, in order to facilitate understanding of the invention, scales such as the thickness of the film may be changed in some places.

In each of the embodiments described below, a packaging container having a cylindrical body is exemplified as an object to be packaged. Examples include capped containers, spray containers, bottle-shaped containers, and the like. The target packaged items are not limited to these containers, but include various products.

(Embodiment 1: Packaging material 1) With reference to FIGS. 1 to 4, the structure of packaging material 1 and its manufacturing method will be described. 1 is a front view showing the structure of the packaging material 1, FIG. 2 is a sectional view taken along the line II-II in FIG. 1, and FIG. 3 is a cross-sectional view taken along the line II-II in FIG. 1 of another form. 4 is a cross-sectional view corresponding to the line II-II in FIG. 1 of still another embodiment. Note that the horn 510 and anvil 520 for thermosonic heat welding shown in FIG. 2 are not shown in FIG. 1 for convenience of explanation.

The packaging material 1 includes a mount 110 and a heat-shrinkable film 100. The mount 110 has a base 110a and a thermofusible thin film 110b provided on one side of the base 110a.

As shown in FIG. 1, the base 110a has a substantially rectangular shape. However, the shape of the base 110a is not limited to a rectangle. The axial direction of the circumferential surface of the object to be packaged 300 (see FIG. 5; the same applies hereinafter) is parallel to the surface of the base 110a. When the object to be packaged 300 has a gourd shape, for example, the axial direction of the circumferential surface of the object to be packaged 300 is not parallel to the surface of the base 110a. In this way, depending on the shape of the object to be packaged 300, the surface of the base 110a and the axial direction of the circumferential surface of the object to be packaged 300 may not necessarily be parallel. Product information of the packaged object 300 may be written on at least one of the front and back surfaces of the base 110a. The base 110a is made of cardboard, for example.

Examples of the heat-fusible thin film 110b include a heat-fusible film and a coating film. The heat-melting thin film 110b includes polyethylene terephthalate and its modified products, polyester resins such as polybutylene terephthalate and polylactic acid, various polyethylenes such as low-density polyethylene and high-density polyethylene, polypropylene, and polyolefins such as copolymers thereof. Laminated films made of resins, styrene resins such as styrene-butadiene copolymers, acrylic resins, and vinyl resins such as polyvinyl chloride, or coatings made by applying these resins in a molten or solution state can be used. , it is possible to select one that is suitable for ultrasonic welding with heat-shrinkable films made of various materials.

A heat-shrinkable film 100 having a storage space 100a for storing an object to be packaged is disposed on one side of the mount 110 on which the heat-fusible thin film 110b is provided. In the heat-shrinkable film 100, a housing space 100a is defined by forming the heat-shrinkable film 100 into a cylindrical shape. Along the direction in which this cylindrical accommodation space 100a extends (the direction of the arrow Y in FIG. (areas indicated by dot hatching). This ultrasonic welding region 120 fixes the heat-shrinkable film 100 to the heat-fusible thin film 110b of the mount 110. The heat-shrinkable film 100 having a cylindrical shape is provided with openings 100b at both ends in the axial direction to accommodate the packaged object 300.

In the ultrasonic welding area 120, non-welding areas 120a where the ultrasonic welding area 120 is not provided are provided at both ends of the heat-shrinkable film 100 in the direction in which the housing space 100a extends. In the present embodiment, the non-welded regions 120a are provided at both ends of the heat-shrinkable film 100, but the non-welded regions 120a may be provided at either end. By providing this non-welding region 120a, it is possible to suppress the occurrence of distortion in the heat-shrinkable film 100 when the heat-shrinkable film 100 is later shrunk and the packaged object 300 is held. . Details will be described later.

The heat-shrinkable film 100 is preferably a uniaxially stretched film that is heat-shrinkable in the circumferential direction of the circumferential surface of the packaged object 300 accommodated in the accommodation space 100a. The heat-shrinkable film 100 is not limited to a uniaxially stretched film, but may be a biaxially stretched film that is heat-shrinkable in two directions: the circumferential direction and the axial direction of the circumferential surface.

The uniaxially stretched film refers to a film that has been substantially uniaxially stretched, and has shrinkage rates in the circumferential direction and the axial direction that are significantly different from each other. Specifically, the uniaxially stretched film is not limited to a film that does not shrink in either the circumferential direction or the axial direction. Examples include films having a shrinkage rate of 35% or more and 80% or less, and a heat shrinkage rate of -5% or more and 20% or less in the above-mentioned axial direction.

Specific examples of the heat-shrinkable film 100 having heat-shrinkable properties include polyolefins such as linear low-density polyethylene (LLDPE), low-density polyethylene (LDPE), high-density polyethylene (HDPE), and polypropylene (PP); Polyesters such as terephthalate (PET) or polybutylene terephthalate (PBT), polystyrenes (PS) such as styrene butadiene copolymer, or polylactic acid (PLA), polyamide (PA), polyvinyl chloride (PVC), etc. , a film made of resin.

The heat-shrinkable film 100 may be a film containing a resin mixture of two or more of these resins, or may be a laminated film in which two or more films are laminated. In particular, the heat-shrinkable film 100 is preferably a polyester-based or polystyrene-based uniaxially stretched film because it has appropriate shrinkage stress and high transparency.

The thickness of the heat-shrinkable film 100 is not particularly limited, but is preferably 8 μm or more and 100 μm or less, more preferably 10 μm or more and 80 μm or less, particularly preferably 15 μm or more and 60 μm or less.

The heat-shrinkable film 100 is not limited to the structure of the heat-shrinkable film described above, and may be a colored heat-shrinkable film or a heat-shrinkable film on which a printed layer for displaying a product name, design, etc. is formed. You can. When a printed layer is provided, it is preferable that it be provided at a position on the inner surface of the heat-shrinkable film excluding the ultrasonic welding area, and in the ultrasonic welding area, the film surface is exposed and the film surfaces are ultrasonically welded together. For example, a design different from the design attached to each packaged object 300 may be displayed on the printed layer of the heat-shrinkable film 100. Thereby, the external design of the packaged object 300 can be changed depending on the state in which it is packaged in the packaging material 1 and the state in which it is taken out from the packaging material 1.

(Method of Manufacturing Packaging Material 1) As shown in FIG. 2, the method of manufacturing packaging material 1 involves preparing a mount 110 provided with a heat-fusible thin film 110b on one side, and placing the mount 110 on the heat-fusible thin film 110b side. A heat-shrinkable film 100 is prepared, which is formed into a cylindrical shape so as to have a housing space 100a including an opening 100b for housing an object to be packaged, and then folded flat.

Next, the overlapping region of the ends of the heat-shrinkable film 100 is sandwiched between a horn 510 and an anvil 520 for thermo-ultrasonic heat welding, and ultrasonic waves are applied, while maintaining the opening 100b and the accommodation space 100a. . As a result, the inner surfaces of the heat-shrinkable film 100 and the outer surface of the heat-shrinkable film and the heat-melting thin film 110b are welded together to form an ultrasonic welding region 120. The ultrasonic welding region 120 may have a width dimension of, for example, 5 mm to 15 mm. The applied ultrasonic waves can be appropriately selected depending on the heat-shrinkable film 100 used, but in this embodiment, ultrasonic waves of about 20 kHz to about 40 kHz were used. By providing uneven notches on the surface of the horn or anvil, the welded portion can have a notched pattern. The notches may be in a grid pattern, various linear shapes, scattered dot shapes, or the like. Further, the positions of the horn and anvil may be reversed. When providing unevenness such as a notch pattern on the horn or anvil, the welding strength of the heat-shrinkable film 100 can be obtained by providing the unevenness on the side in contact with the heat-shrinkable film 100 and making the side in contact with the base 110a flat. This makes it possible to easily prevent uneven pressure bonding marks from occurring on the surface of the base 110a. In particular, the surface of the horn 510 in contact with the heat-shrinkable film 100 is provided with irregularities, and the anvil 520 in contact with the base 110a has a flat surface and a larger area than the horn (for example, an area more than twice that of the horn, or almost the entire mount). (area that can be placed).

As shown in the cross section of FIG. 2, the cylindrical housing space 100a may be formed into a cylindrical shape to which the end portion 100t of the heat-shrinkable film 100 is joined in advance, or as shown in FIG. The ends 100t on both sides of the heat-shrinkable film 100 may be located in the ultrasonic welding region 120. Furthermore, as shown in FIG. 4, one end 100t of the heat-shrinkable film 100 is heat-welded to the heat-shrinkable film 100 in advance so as to constitute an accommodation space 100a. The other end 100t may constitute the ultrasonic welding region 120. Note that the end shrink state in the cases of FIGS. 3 and 4 is different from that in FIG. 1. In FIG. 3, the ultrasonic welding region 120 is provided up to the end, and the non-welding region 120a is not provided. In FIG. 4, the ultrasonic welding region 120 is provided up to the end.

(Packaging state of packaged object 300) With reference to FIGS. 5 to 8, a case where the packaged object 300 is packaged using the packaging material 1 having the above configuration will be described. FIG. 5 is a front view of the packaging material 1 containing the packaged object 300 before the heat-shrinkable film 100 is heat-shrinked, and FIG. 7 is a sectional view taken along the line VII-VII in FIG. 6, and FIG. 8 is a sectional view taken along the line VII-VII in FIG. 6 in a comparative technique. It is.

Referring to FIG. 5, an object to be packaged 300 is accommodated in the accommodation space 100a (see FIG. 2) of the heat-shrinkable film 100. The object to be packaged 300 has a size that fits within the accommodation space 100a, and in the example of FIG. 5, it is arranged at the position of the ultrasonic welding area 120 with a length equivalent to the axial length of the ultrasonic welding area 120. Next, referring to FIG. 6, the object to be packaged 300 is housed in the packaging material 1 by heat-shrinking the heat-shrinkable film 100. In this embodiment, the size of the storage space 100a for the heat-shrinkable film 100 is changed so that the heat-shrinkable film 100 wraps around the periphery of the top and bottom surfaces of the packaged object 300 after the heat-shrinkable film 100 is heat-shrinked, and the The design is such that an open portion 100h is provided in the portion. With this size design, when the heat-shrinkable film 100 is shrunk and the packaged object 300 is held in the region surrounded by Z in FIG. 6, the heat-shrinkable film in the welded region also shrinks. Therefore, the heat-shrinkable film 100 wraps around the periphery of the top and bottom surfaces of the packaged object 300, thereby suppressing the occurrence of distortion in the heat-shrinkable film 100.

Furthermore, with reference to FIG. 7, although the packaged object 300 after heat shrinking of the heat shrinkable film 100 rises with the ultrasonic welding region 120 located on the mount 110 side, the heat shrinkage force of the heat shrinkable film 100 Due to (arrow F1 in FIG. 7), a force is applied to the packaged object 300 to draw it toward the mount 110 side. As a result, the object to be packaged 300 is suppressed from shaking relative to the mount 110 and is stably held on the mount 110.

On the other hand, in fixing the packaged object 300 to the mount 110 using the hot melt 400 shown in the comparative technique of FIG. A space is likely to be created between the shrinkable film 100 and the packaged object 300 to be easily swayed in the left-right direction (direction of arrow F2 in FIG. 8) with the center of rotation at the location where the hot melt 400 is applied. As a result, in the case of the packaging material of the comparative technology, there is a risk that the heat-shrinkable film 100 wrapping the packaged item 300 may be peeled off from the mount 110 when the packaged item 300 is transported or displayed at a store.

(Operation/Effect) In this way, the packaging material 1 according to the present embodiment can fix the heat-shrinkable film 100 to the mount 110 without using an adhesive such as hot melt. This eliminates the need to take measures against stringiness in the hot melt, to cool and solidify the hot melt, and to ensure aging time.

Furthermore, the end portion of the heat-shrinkable film 100 can be fixed to an arbitrary location on the mount 110 by ultrasonic vibration, and the heat-shrinkable film 100 can be fixed at a free position on the mount 110. It is possible to suppress bending of the heat-shrinkable film 100 and generation of wrinkles in the heat-shrinkable film 100. Another possible welding method is thermal welding by pressing a heated heat-seal bar, but with a heat-seal bar, the heat-shrinkable film 100 around the welded area partially shrinks, causing distortion and dimensional changes, which is undesirable. , Ultrasonic welding can locally heat only the welding location. Since it can be heated locally, it is also suitable for heat-shrinkable films made of polyethylene terephthalate or modified resins thereof, which require high-temperature welding.

(Embodiment 2: Packaging material 1A) The form of packaging material 1A in this embodiment will be described with reference to FIGS. 9 and 10. FIG. 9 is a front view showing the configuration of the packaging material 1A, and FIG. 10 is a front view showing the packaging material 300 accommodated therein.

The basic configuration of the packaging material 1A is the same as the packaging material 1 in the first embodiment. The difference is that the ultrasonic welding area 120 is provided over the entire length of the housing space 100a of the cylindrical heat-shrinkable film 100 (direction of arrow Y in FIG. 9), and the non-welding area 120a is not provided. do. Referring to FIG. 10, packaging material 1A is assumed to be held such that both ends of packaged object 300 are exposed from heat-shrinkable film 100. This packaging material 1A can also provide the same effects as the packaging material 1 of the first embodiment.

Furthermore, since it is possible to adopt a configuration that does not provide the non-welded area 120a shown in FIG. Even in cases such as when only the central part of the body is covered, ultrasonic welding provides the effect of not causing unnecessary shrinkage or distortion of the heat-shrinkable film other than the welded area.

(Embodiment 3: Packaging material 1B) With reference to FIG. 11, the form of packaging material 1B in this embodiment will be described. FIG. 11 is a front view showing the configuration of packaging material 1B according to the third embodiment.

The basic configuration of the packaging material 1B is the same as the packaging material 1 in Embodiment 1, but the ultrasonic welding region 120 is divided into a plurality of parts in the direction in which the accommodation space 100a of the cylindrical heat-shrinkable film 100 extends. It is provided. In FIG. 11, the ultrasonic welding areas 120 are provided at three locations, but this number can be changed as appropriate. This packaging material 1B can also provide the same effects as the packaging material 1 of the first embodiment.

(Embodiment 4: Packaging material 1C) With reference to FIG. 12, the form of packaging material 1C in this embodiment will be described. FIG. 12 is a front view showing the configuration of packaging material 1C according to the fifth embodiment.

The basic configuration of the packaging material 1C is the same as the packaging material 1 in Embodiment 1, but the shapes of the heat-shrinkable film 100 in each of the above embodiments were rectangular, square, and trapezoidal. In this case, the heat-shrinkable film 100 has a trapezoidal shape, and an ultrasonic welding region 120 is provided on the entire short side. In this case, the shape is not limited to a trapezoid, but may be a shape in which at least one of the upper and lower sides is cut in an oblique direction (diagonally upward from the upper end or diagonally downward from the lower end). By providing the opening 100b cut in the diagonal direction in this way, the peripheral edges of the top and bottom surfaces of the packaged object can be covered with the opening 100b cut in the diagonal direction without providing the non-welding area 120a. It becomes possible to do so. Thereby, the packaged item can be reliably held on the top surface and/or the bottom surface. This packaging material 1C can also provide the same effects as the packaging material 1 of the first embodiment.

(Embodiment 5: Packaging material 1D) With reference to FIG. 13, the form of packaging material 1D in this embodiment will be described. FIG. 13 is a cross-sectional view of the packaging material 1D according to the fifth embodiment, taken along the line II-II in FIG.

In each of the packaging materials in the above embodiments, the ultrasonic welding region 120 was provided at one end of the heat-shrinkable film 100. In this embodiment, ultrasonic welding regions 120 are provided at both ends of the heat-shrinkable film 100.

As shown in FIG. 2, the ultrasonic welding region 120 requires the heat-shrinkable film 100 to be sandwiched between the horn 510 and the anvil 520. Therefore, in the heat-shrinkable film 100 in this embodiment, in the left and right width direction, the long side film 100d is arranged on the mount 110 side, the short side film 100u is arranged on the opposite side to the mount 110, and on both sides, A foldable side wall film 100s is provided.

This allows both ends of the long side film 100d (points indicated by arrows LB in FIG. 13) to be sandwiched between the horn 510 and the anvil 520 from above and below on both sides of the heat-shrinkable film 100. Also with this configuration, the heat-shrinkable film 100 can be fixed to the mount 110 by ultrasonic welding. Since the heat-shrinkable film 100 can be fixed to the mount 110 at two locations, this is suitable when the object to be packaged is relatively heavy. This packaging material 1D can also provide the same effects as the packaging material 1 of the first embodiment.

(Embodiment 6: Packaging material 1E) With reference to FIGS. 14 and 15, the form of packaging material 1E in this embodiment will be described. FIG. 14 is a perspective view of the packaging material 1E containing the object to be packaged 300, and FIG. 15 is a sectional view corresponding to the XV-XV line arrow in FIG. 14 before the object to be packaged is accommodated. .

The packaging materials in each of the above embodiments are packaging materials designed to accommodate one packaged item 300, but the present embodiment is designed to accommodate two packaged items 300. The packaging material was Note that the number of the objects to be packaged 300 is not limited to two, and based on the same idea as in this embodiment, it is also possible to accommodate a configuration in which three or more objects to be packaged 300 are accommodated.

In this packaging material 1E, an ultrasonic welding area 120 is provided at the center of the heat-shrinkable film 100, and two accommodation spaces 100a for accommodating the packaged items are provided on both sides of the ultrasonic welding area 120. .

This makes it possible to hold the same type of packaged items or different types of packaged items on one mount 110. This packaging material 1E can also provide the same effects as the packaging material 1 of the first embodiment.

(Horn used in the embodiment) A specific example of the shape of the uneven surface of the horn 510 forming the ultrasonic welding region 120 shown in FIG. 2 etc. will be described with reference to FIGS. 16 and 17. FIG. 16 is a plan view of the surface of the horn 510 viewed from the tip side, and FIG. 17 shows the tip portion of the horn in cross section taken along the line XVI-XVI in FIG. 16. The width of the horn 510 (vertical direction in FIG. 16) is 10 mm, and the length is made to match the ultrasonic welding area 120. The convex portions 511 are arranged in a diagonal of 45 degrees in a plan view, and as shown in FIG. 17, the convex portions 511 having a trapezoidal cross section (truncated pyramid shape) are arranged at a pitch of 1 mm. The height of the convex portion 511 is set to 0.25 mm. Although the shape of the convex portions 511 is not limited to this, a large number of convex portions 511 are provided at the tip of the horn 510 in this way, and the convex portions 511 are formed by bringing the convex portions 511 into contact with a heat-shrinkable film and applying ultrasonic waves. It is possible to efficiently and firmly weld the tip of the portion 511.

In addition, as another form of the packaging material, the direction in which the housing space 100a for the heat-shrinkable film extends may be inclined with respect to the mount, or may be provided in the left-right direction. As yet another form of the packaging material, heat-fusible thin films may be provided on both sides of a mount, and heat-shrinkable films may be ultrasonically welded to both sides.

Although the packaging material and the method for manufacturing the packaging material of the present disclosure have been described above in the embodiments, the embodiments disclosed herein are illustrative in all respects and are not restrictive. The scope of the present invention is indicated by the claims, and includes all changes within the meaning and range equivalent to the claims.

1, 1A, 1B, 1C, 1D, 1E packaging material, 100 heat-shrinkable film, 100a accommodation space, 100b opening, 100h opening, 100d long side film, 100s side wall film, 100t end, 100u short side film, Reference Signs List 110 mount, 110a base, 110b thermofusible thin film, 120 ultrasonic welding area, 120a non-welding area, 300 packaged object, 400 hot melt, 510 horn, 520 anvil.

Claims (4)

A mount provided with a heat-fusible thin film on one side; and a heat-shrinkable film disposed on the one surface and having a storage space for accommodating an item to be packaged, the heat-shrinkable film being a mount provided with a heat-fusible thin film on the mount. A packaging material fixed to the thermofusible thin film by ultrasonic welding. The housing space is defined by making the heat-shrinkable film into a cylindrical shape, and the heat-fusible thin film and the heat-shrinkable film are exposed to ultrasonic waves along the direction in which the cylindrical housing space extends. The packaging material according to claim 1, further comprising a welded area. 3. In the direction in which the cylindrical accommodation space extends, at least one end of the heat-shrinkable film is provided with a non-welded region where the ultrasonic welding region is not applied. packaging material. a step of preparing a mount provided with a heat-fusible thin film on one side; and a step of preparing a heat-shrinkable film so as to have an accommodation space disposed on the one side and including an opening for accommodating an item to be packaged. A method for manufacturing a packaging material, comprising the steps of: welding the heat-shrinkable film and the heat-fusible thin film using ultrasonic waves while maintaining the opening and the accommodation space.

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