JP2000272659A - Peelable package body and peelable packaging method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To rapidly enhance pealing strength at a predetermine position in the opening direction, and enable opening to be done easily at the position, however, enable a stop of the opening operation positively at this position, and conduct the operations simply and inexpensively. SOLUTION: A peelable layer 5 is formed on one surface of the base material resin layer 4 of at least one packaging material 2, and then the layer 5 is heat bonded to the other packaging material 3 in order to form a weak sealing part 9 around matter 7 to be packaged. In addition, a resin staying reservoir 12 gathered by heating and flowing a part of the constitutional resin of the packaging material 2 is formed at least on a part following the intermediate part in the opening direction of the weak sealing part 9, and further the adhesive strength of the resin staying reservoir 12 is made higher than that of the weak sealing part 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a peelable package which can hold the inside airtight in a packaged state and can be easily opened by peeling it off with a relatively light force when desired, and a packaging method therefor. The present invention relates to a peelable packaging that can rapidly increase the peel strength at a predetermined position in the opening direction, can easily open up to this position, can surely stop the opening operation at this predetermined position, and can be performed easily and at low cost. .

[0002]

BACKGROUND OF THE INVENTION As a package such as a tablet, for example, an object to be packaged is arranged between two films, and the periphery of the object to be packaged is heat-pressed to weld both films to form a seal portion. There is a so-called peelable package in which the seal portion is opened by peeling the two films from each other with a knob margin provided at the end. The peelable package,
A peel layer is formed on the inner surface of at least one of the films with a resin having low strength so that each film can be peeled without being damaged.

When the peelable package is opened, the two films can be peeled off from each other with a relatively small force and can be easily opened. However, if the opening size is small, the object to be packaged cannot be taken out. If the package is opened too much, the article to be packaged easily pops out of the package, and it is not easy to open the package to an appropriate position. In addition, since the picking margins of both films are peeled off with both hands, there is a risk that the packaged object may pop out due to excessive opening. May be unsanitary. In addition, there is a possibility that the packaged object that has popped out may not be received and fall on the floor or the like, and may be lost or soiled. Therefore, it is desired to provide a peelable package that can increase the peeling strength at an appropriate predetermined position in the peeling direction of the seal portion, can easily peel up to the predetermined position, and can reliably stop the opening operation at the predetermined position. ing.

[0004]

2. Description of the Related Art As a conventional peelable package in which the peel strength is enhanced at an appropriate position in the peeling direction of a seal portion,
For example, there is a seal disclosed in Japanese Patent Application Laid-Open No. 3-111267 in which the seal width is increased in the middle. That is, as shown in FIG. 16, for example, as shown in FIG. 16, the peelable package is heated and pressure-bonded to a peel layer formed on one surface of at least one packaging film (51) to the other packaging film (52). A weak seal portion (54) is formed around the periphery of the weak seal portion (53), and the weak seal portion (5)
A wide portion (55) in which the seal width of 4) is increased is formed.
When opening this peelable package (50), when the two films (51, 52) are peeled off from each other with the knob margin (56),
The opening resistance is increased in the wide portion (55) where the peel strength is high because the seal width is wide. As a result, since the opening operation is temporarily stopped at the wide portion (55), the effect of preventing the packaged object from jumping out can be expected.

[0005]

Generally, the size of the package cannot be excessively large as compared with the size of the article to be packaged, which is not economically advantageous. For this reason, the width of the wide portion of the prior art is limited to about twice as large as the weak seal portion. However, once the peeling starts, the weakly sealed portion of the peelable package body continues to be smoothly peeled off. Therefore, even if the peeling strength is increased about twice in the middle, the opening resistance does not become large, and the wide portion continues to be peeled off. Then, it is easy to open more than a predetermined size. As a result, there is a risk that the object to be packaged may inadvertently jump out of the package or fall onto the floor or the like even in the case of this prior art.

It is also conceivable to use a peelable film material formed by a so-called part coat in which a peel layer is formed only in the weak seal portion and the other portion is directly welded with a base resin to another packaging material. . But in this case,
It is necessary to precisely position the formation part of the peel layer and the storage part of the packaged material, which is not easy to implement.In addition, various types of peelable films must be prepared according to the shape and size of the packaged material. There is a problem that it is complicated and cannot be implemented at low cost. The present invention solves the above problems, sharply increases the peel strength at a predetermined position in the opening direction, enables easy opening up to this position, and reliably stops the opening operation at this predetermined position. It is a technical object to provide a peelable package and a peelable packaging method which can be implemented at low cost.

[0007]

Means for Solving the Problems In order to solve the above problems, the present invention will be described with reference to, for example, FIGS. 1 to 15 showing an embodiment of the present invention. It is composed. That is, the present invention 1 relates to a peelable packaging body, in which a peel layer (5) is formed on one surface of at least one packaging material (2), and this peel layer (5) is heat-pressed to another packaging material (3). Thereby, a weak seal portion (9) is formed around the article to be packaged (7), and at least a part of the weak seal portion (9) after the middle portion in the opening direction of the weak seal portion (9) is formed of the resin of the packaging material (2). Is formed by flowing a part of the resin pool by heating to form a resin reservoir (12), and the adhesive strength of the resin reservoir (12) is higher than that of the weak seal portion (9).

[0008] The peel layer (5) is usually made of the packaging material.
It is formed on one side of the base resin layer (4) of (2). in this case,
The adhesive strength of the resin reservoir (12) is such that the peel layer (5) in the resin reservoir (12) is disturbed by the flow caused by heating, and the resin reservoir ( It can be increased by directly welding the base resin of 12) to the other packaging material (3).

A first resin (5a) in which the peel layer (5) forms a continuous phase and a second resin dispersed in the first resin.
(5b), the resin pool (1
The second resin (5b) dispersed in the first resin (5a) is deformed by the flow caused by the heating in (2), thereby increasing the adhesive strength of the resin reservoir (12).

The resin reservoir may be long along the opening direction of the weak seal portion. However, when the resin reservoir is formed to be substantially perpendicular to the opening direction, the width of the resin reservoir relative to the opening direction is reduced. Since the opening resistance can be increased, the opening resistance at this position can be more clearly increased, which is more preferable.

The present invention 2 relates to a peelable package, wherein a peel layer (5) is formed on one surface of at least one of the packaging materials (2), and the peel layer (5) is heat-pressed to another packaging material (3). This forms a weak seal portion (9) around the article to be packaged (7), and the peel layer (5) is connected to the first resin (5) forming a continuous phase.
a) and a second resin (5b) dispersed in the first resin, and a heat treatment is applied to at least a part of the weak seal portion (9) at and after the intermediate portion in the opening direction to form the first resin. Resin (5
a) deforming the second resin (5b) dispersed therein, so that the adhesive strength of the heat-treated portion (24) is higher than that of the front end portion in the opening direction of the weak seal portion (9). .

In the second invention, the treatment of heating at least a part of the middle part and the subsequent parts in the opening direction may be performed after forming the weakly sealed portion, but before the heating and pressure bonding to another packaging material. A predetermined portion of the peel layer may be subjected to heat treatment in advance. In this case, since the peel layer is heated in an open state before being pressed against another packaging material, the second resin which is a dispersed phase is easily deformed and flowable, and furthermore, the intermediate layer in the opening direction and after the second resin. Then, since the second resin is bonded to another packaging material in a state where the mutual interval is widened, it is possible to surely increase the bonding strength of this portion.

The present invention 3 relates to a peel packaging method, wherein a packaged object (7) is arranged between a peel packaging material (2) having a peel layer (5) formed on one side and another packaging material (3). Then, the two overlapping packaging materials (2, 3) are guided and passed between a pair of sealing means (15, 15), and the above-mentioned sealing means (15, 15) are passed through.
.15) is narrowed around the article to be packaged (7), and the two packaging materials (2, 3) are heat-pressed to form a weak seal portion (9) around the article to be packaged (7). ), And a narrow gap forming a weak seal portion (9) between the sealing means (15, 15).
(16) and at least a part of the weak seal portion (9) after the middle portion in the opening direction of the weak seal portion (9), the narrow gap.
A gap (17) wider than (16) is formed, and the constituent resin of the packaging material (2) fluidized by the heat compression bonding is used to form the gap (17).
It is characterized in that the resin pool (12) is formed at this portion by flowing into the inside.

In the third aspect of the present invention, the sealing means generally employs a pair of rolls and bars. In order to heat-press both packaging materials with these sealing means, it is usually necessary to make the gap between these sealing means at least smaller than the total thickness of both packaging materials. However, in many cases, irregularities such as file eyes are formed on the surface of the sealing means and these irregularities are meshed with each other, and the gap between the sealing means of this type generally refers to a peak-to-valley between the irregularities. -Even if the gap between the valleys is wider than the total thickness of both packaging materials,
By making the interval between the peaks of the indented irregularities smaller than the total thickness of both packaging materials, both packaging materials can be pressed by this sealing means.

In the present invention, the packaging material constituting the above-mentioned packaging body is only required to be in the form of a film which can be peeled off at least on one side, and is not limited to a construction in which two films are overlapped with each other as in the prior art. Instead, for example, a container formed in a cup shape and having an opening peripheral edge sealed with a film, or another packaging form may be used. Further, the packaging material may be a material in which at least one has a peel layer formed on one side, and the other packaging material is not limited to a synthetic resin, and may be a material obtained by subjecting a metal material such as an aluminum foil to a resin processing on the surface. There may be. Further, a peel layer may be formed on one surface of the other packaging material in the same manner as the one packaging material.

Among the constituent resins of the packaging material, a thermoplastic synthetic resin such as polypropylene is used as the base resin, and a material that can obtain high adhesive strength by heat welding to the other packaging material is selected. On the other hand, as the material used for the peel layer, a material which is easily welded to the other packaging material but is liable to cause cohesive failure, interfacial fracture, or interlayer fracture with a relatively weak force is selected. As a phase, a resin material in which a polyethylene resin is dispersed in the polypropylene resin is specifically exemplified.

The peel layer may be formed only on a necessary portion of the packaging material. However, the resin layer may be formed at an intermediate portion in the unsealing direction, or a predetermined portion may be formed by heat treatment. Because it increases the adhesive strength,
It is also possible to use a peel wrapping material having the peel layer formed on one entire surface. In this case, it is not necessary to accurately position the accommodation portion of the packaged object with respect to the peel wrapping material, A small variety of packaging materials can be used for packaging objects of various shapes and dimensions.

[0018]

According to the first aspect of the invention, the weak seal portion formed by heat-pressing the peel layer formed on one side of the base resin layer to another packaging material securely seals the periphery of the packaged object. The adhesive force is weak, and the weak seal portion can be easily opened by peeling off with the knob margin provided at the end. When the unsealing position reaches the resin pool portion, the resin pool portion has a higher adhesive strength than the weak seal portion. At this position, the position where the opening resistance rapidly increases and the opening should be stopped is determined. Recognized clearly.

The adhesive strength of the resin reservoir is disturbed in the peel layer in the resin reservoir by the flow caused by the heating, and the base resin in the resin reservoir is transferred to the other packaging through the turbulent portion of the peel layer. When directly welded to the material, the adhesive strength with other packaging materials can be set to be much higher than that of the above weak seal portion by appropriately selecting the type of the base resin.

When the peel layer is composed of a first resin forming a continuous phase and a second resin dispersed in the first resin, the dispersed second resin is generally flat in the direction of the peel layer. The surface of the second resin, that is, the area of the interface with the first resin is large, and the interval between the second resins is small. Therefore, in the weak seal portion where the peel layer is heated and pressed, when an external force is applied, the peel layer easily starts to peel off from the interface between the first resin and the second resin, and finally the first resin which is a continuous phase undergoes cohesive failure. It is considered to be peeled off with a relatively weak force. On the other hand, when the resin flows in the resin reservoir due to the heating, the second resin dispersed in the first resin tends to deform into a more stable spherical shape. It is thought that this reduces the area of the interface with the first resin and increases the mutual spacing between the second resins. As a result, the adhesive strength of the resin reservoir is higher than that of the weak seal.

In the second invention, similarly to the first invention, the weak seal portion formed by heat-pressing the peel layer formed on one surface of the base resin layer to another packaging material is formed around the material to be packaged. Is firmly sealed, but the adhesive force is weak, and the weak seal portion can be easily opened by peeling off with a knob margin provided at the end. When the unsealing position reaches the portion subjected to the heat treatment, the heat treatment portion
It is considered that the second resin dispersed in the resin is deformed, the area of the interface with the first resin is reduced, and the interval between the second resins is increased, so that another weak seal portion, that is, the tip side in the opening direction is considered. Since the adhesive strength is higher than that of the part, the opening resistance rapidly increases at this position, and the position where the opening should be stopped is clearly recognized.

The above-mentioned resin reservoir is formed by fluidizing the base resin constituting the packaging material or the resin of the peel layer. The fluidization of the constituting resin depends on the type of the resin, the heating temperature of the sealing means, the pressure, the sealing force, and the like. Since it differs depending on sealing conditions such as the gap of the means and the passing speed (pressurizing time), it is possible to form the resin reservoir at a predetermined position by precisely setting these sealing conditions. However, the type of resin, heating temperature,
In the case of the pressure, the passage speed, and the like, it is not easy to form the weak seal portion and the resin pool by one heat-press bonding in the process of continuous production of the package.

On the other hand, according to the third aspect of the invention, a wide gap is formed at a portion adjacent to the narrow gap between the sealing means and at least a part of the weak seal portion after the middle portion in the opening direction of the weak seal portion. The resin component of the above-mentioned packaging material is allowed to flow into this wide gap to form a resin reservoir at this location, so that a weak seal portion is formed at a predetermined position by using a sealing means having a gap set in accordance with the product shape. The resin puddle is easily formed by one heat-press bonding. Note that the resin reservoir may be formed by a plurality of times of thermocompression bonding, for example, by forming a weak seal portion and then thermocompression bonding a predetermined portion after the middle portion in the opening direction.

At the time of the thermocompression bonding, the gap at the rear portion of the weak seal portion is made narrower than the gap between the sealing means at the front portion than the wide gap in the opening direction. In the case of thermocompression bonding of both of the above packaging materials, in the thermocompression bonding at the front part, the flow of the constituent resin of the packaging material is reduced, and it is possible to make it difficult for a resin pool to be formed on the front end side at which opening is started, while Since the resin is heated and pressed by the sealing means having a narrower gap, the constituent resin of the packaging material flows with certainty, and a part of the resin flows into the wide gap, so that the resin reservoir is reliably formed.

[0025]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 6 show a first embodiment of the present invention used for packaging tablets, FIG. 1 (a) is a perspective view of a peelable package, and FIG. 1 (b) is B in FIG. 1 (a). 2 is a front view of the peelable wrapping body showing a continuous state, FIG. 3 is an estimated view in which a cross section near the resin reservoir is enlarged, and FIG. 4 is an explanatory view showing a modification of the gap of the sealing means. FIG. 5 shows a comparative test 1 in which the sealing conditions were changed and the peel strength (adhesive strength) at the resin reservoir was compared.
FIG. 6 is a perspective view for explaining an example of the opening operation.

As shown in FIG. 1, this peelable package
(1) is two rectangular packaging films stacked on top of each other
It consists of (2.3). The packaging film (2) has a peel layer on the inner surface side of the base resin layer (4) made of polypropylene resin.
(5) is laminated, and a heat-resistant film (6) such as cellophane or polyethylene terephthalate resin is stuck on the outer surface side, and the other packaging film (3) is a base resin layer (4) also made of polypropylene resin. The heat resistant film (6) is bonded only to the outer surface side.

A tablet (7) to be packaged is placed between the two packaging films (2, 3), and the one packaging film (2) is placed.
The peel layer (5) is pressed to the other wrapping film (3) by heating and pressing, so that the tabs (8.8) remain at the ends of the two wrapping films (2.3), respectively. A weak seal portion (9) is formed so as to surround the periphery of (7). In addition, the above-mentioned picking allowance (8) is set to 10 to 100 so that even a person who has difficulty in fingertip operation such as a rheumatic patient can easily open it.
mm, preferably 20 to 50 mm, but the size is appropriately set according to the type of the article to be packaged.

The weak seal portion (9) is provided with a home base shape so as to surround the hexagonal unsealed area (10). The home base V-shaped tip (11) starts opening. It is facing the picking allowance (8). The weak seal part (9)
Is composed of a first half (9a) and a second half (9b), and a part of the constituent resin of the packaging material, such as the base resin and the resin of the peel layer, is heated at the position adjacent to both halves in the middle. A resin pool (12) is formed by flowing and collecting by pressing. In addition,
In this embodiment, only one resin reservoir is provided in the opening direction, but it may be provided at a plurality of locations.

[0029] As shown in FIG.
(1) is usually formed continuously in the front-rear and left-right directions, and is formed by breaking the perforated line (13) formed between the peelable packagings (1.1) to form a single peeling packaging. It is separated into (1). However, it is also possible to form them individually or in a series in a row from the beginning. Reference numeral (14) denotes a peel-preventing seal portion for protecting the V-shaped tip (11) of the weak seal portion (9) from being accidentally opened during storage or the like.

In the resin reservoir (12), the base resin layer (4)
It is presumed that the peel layer (5) is disturbed and the layer state is destroyed when the resin flows and collects by the above-mentioned thermocompression bonding, resulting in a state as shown in FIG. As a result, both packaging films (2
(3) The base resins are directly welded to each other, and the adhesive strength at this position is significantly higher than that of the weak seal portion (9).

Next, a method of packaging the peelable package (1) will be described. A pair of tablets (7) sandwiched between predetermined positions of the packaging films (2, 3) and heated to a predetermined temperature in this state,
It is passed between sealing means (15, 15) such as a die roll. The gap between the two sealing means (15, 15) has a predetermined portion smaller than the total thickness of the two packaging films (2, 3). The peeling layer (5) of the packaging film (2) is applied to the other packaging film (3).
A weak seal portion (9) is formed around the tablet (7) by thermocompression bonding to the base resin layer (4).

The narrow gap (1) between the two sealing means (15, 15)
6) comprises a first crimping portion (16a) and a second crimping portion (16b),
As shown by the imaginary line in FIG. 3, the intermediate portion is rapidly expanded and has a gap wider than the total thickness of the two packaging films (2 and 3).
Formed in (17). In this embodiment, both packaging films (2, 3) are configured to pass between the sealing means (15, 15) from the rear end side, that is, the right end side shown in FIG. Therefore, the first crimping portion (16a) is in the latter half (9b) of the weak seal portion (9), and the second crimping portion (16b) is in the weak seal portion (9).
Respectively correspond to the first half (9a).

The first crimping portion (16a) at the narrow interval (16)
The resin of the base resin layer (4) heated and pressed by the sealing means (15) in the first crimping portion (16a) is formed to be narrower than the second crimping portion (16b). Is fluidized and flows into the wide gap (17) to form a resin reservoir (12). At this time, the peel layer (5) is disturbed by the flow of the base resin and the layer state is broken. As a result, the base resins of the resin reservoir (12) are directly welded to each other via the disordered portion of the peel layer (5), and the adhesive strength at this position is significantly increased.

On the other hand, the gap between the second crimping portions (16b) is narrow enough to be able to crimp both packaging films (2, 3), but is wider than the first crimping portion (16a). As a result, in the first half (9a) of the weak seal portion (9) heated and pressed by the second pressure-bonding portion (16b), fluidization of the resin of the base resin layer (4) and the peel layer (5) occurs. Since the resin reservoir is less likely to be formed on the pick margin (8) side of the weak seal portion (9), that is, on the tip end side where the opening is started, the first half (9a) can be easily opened.

The gap (16, 17) between the sealing means (15, 15)
In order to greatly affect the peel strength (adhesion strength) of the weak seal part and the resin pool part, for example, precisely control the limiter attached to the sealing means, or provide a ridge with a predetermined height on the peripheral surface of the die roll It is preferable to secure a predetermined gap between the two sealing means while applying high pressure by the sealing means, for example, by contacting the tip of the ridge with the other die roll.

In this embodiment, the first crimping portion and the second
The gap is different between the crimping part and the gap is formed uniformly in each crimping part, but it is sufficient that at least a part of the crimping part is formed narrow enough to form a resin reservoir, for example, any one of them It is also possible to form the crimping portion or both crimping portions in an inclined shape that becomes gradually narrower as approaching the resin reservoir portion, so that the resin reservoir portion can be formed only at a predetermined position.

Further, for example, even if the entire pressure-bonding portion is formed narrow so that the base resin can flow easily, as shown in FIG. 4, for example, a narrow space formed between a pair of sealing means (15, 15) is formed. Of the gap (16), the opening front side (19) is gently chamfered to smoothly connect to the wide gap (20), and the resin pool side (21) at the rear end expands rapidly to wide the gap (1).
By connecting with 7), the base resin in the resin reservoir can be directly welded to another packaging material only at the rear end side which is a predetermined position. With this configuration, even if the base resin flows, the peeled layer layer state is maintained on the opening front end side (19) even when the base resin flows, and the peeling strength is low, so that the peeling layer is easily peeled off when opened. On the other hand, on the resin pool side (21) at the rear end, since the base resin rapidly expands from the narrow gap (16) of the crimping part, the peel layer is disturbed when the base resin flows into this wide gap (17),
The layer state is destroyed, and the base resin is directly welded to another packaging material, so that high adhesive strength is obtained.

The fluidization of the base resin varies depending on the type of the base resin, the heating temperature and pressure of the sealing means, the gap between the sealing means, the passing speed (pressing time), and the like. However, in general, a high temperature close to the melting point of the base resin, for example, about 150 to 160 ° C. for a polypropylene resin is preferable, and the gap between the sealing means is preferably narrower.

FIG. 5 shows the results of Comparative Test 1 in which the peel strength (adhesion strength) at the resin reservoir of the peelable package formed by changing the heating temperature and the gap of the sealing means was compared. One of the packaging films used was a film obtained by laminating a 12 μm-thick polyethylene terephthalate resin to a 40 μm-thick peel film having a peel layer formed on one side of a polypropylene resin, and the other being a 40 μm-thick polypropylene resin film. This is a film in which a polyethylene terephthalate resin having a thickness of 12 μm is bonded. However,
In the comparative example, both packaging films used a film in which a 12 μm-thick polyethylene terephthalate resin was bonded to a 40 μm-thick polypropylene resin film. Since the sealing means has irregularities on its surface,
The gap between the sealing means indicates the estimated dimension between the peaks and valleys of the irregularities. This sealing means is pressurized at 7 kg / cm ² ,
The packaging film was passed between the sealing means at a speed of 13 m / min.

As is evident from the results of Comparative Test 1, when the sealing temperature is low or the gap between the sealing means is wide,
In the resin reservoir, only a weak peel strength comparable to that of the weak seal was obtained, but when the sealing temperature was increased and the gap between the sealing means was narrowed, the adhesive strength was significantly higher than that of the weak seal. .

Next, the opening operation of the peelable package will be described. As shown in FIG. 6, both packaging films (2
・ Tighten each knob allowance (8 ・ 8) in 3) with the right and left thumbs and forefingers, respectively, and fix them. When the unsealing position reaches the above-mentioned resin reservoir portion (12), the unsealing resistance rapidly increases and the further unsealing becomes impossible, and the state shown in FIG. 6 is obtained. At this time, a substantially quadrangular pyramid-shaped depression (18) is formed around the tablet (7), and the tablet (7) is held in a stable state in the depression (18), and the peelable packaging is formed. It does not accidentally jump out of the body (1). In this state, the mouth is opened to the opened part of the peelable package (1), and the tablet (7) falls directly from the peelable package (1) into the mouth when the patient is turned on his back, and the tablet (7) is received by hand. Since there is no need to pick with a fingertip, it is sanitary and the tablet (7) can be taken safely and reliably.

The resin reservoir (12) is provided with two sealing means (15.1.
5) It is formed by rapidly widening the gap between them, but if the size of this wide gap (17) is short, the base resin does not flow sufficiently, and if it is too long, unsealed parts may be generated. There is. The appropriate dimensions vary depending on the packaging material and sealing conditions, but for example, the packaging film used for the above-mentioned peel strength test preferably has a thickness of about 0.5 to 1.5 mm.

In the first embodiment, when the peeling layer is disturbed in the resin reservoir and the layer state is broken, and the base resin is directly welded to another packaging material, thereby increasing the adhesive strength in the resin reservoir. However, in the present invention, it is sufficient that the adhesive strength of the resin reservoir is higher than that of the weak seal, and the layer state of the peel layer does not necessarily need to be destroyed.

FIG. 7 shows a modification of the first embodiment.
FIG. 7A is an enlarged cross-sectional view of a section near the resin reservoir, FIG.
FIG. 7B is an enlarged view of a portion B in FIG.

In this modification, the layer state of the peel layer (5) is maintained even if the constituent resin of the packaging material flows and collects to form the resin reservoir (12) as in the first embodiment. 7 (a)
It is estimated that the state shown in FIG. Here, the peel layer (5) is composed of a first resin (5a) such as a polypropylene resin forming a continuous phase and a second resin (5b) such as a polyethylene resin dispersed in the first resin (5a). Is configured,
As shown in FIG. 7 (b), in the weak seal portion (9), the second resin (5b) is flat in the direction along the peel layer (5), and the first resin (5a) It is considered that the area of the interface with the second resin (5b) is large, and the mutual interval between the second resins (5b) is small.

On the other hand, in the resin reservoir (12), when the resin flows by the heating, the second resin (5b) tends to deform into a more stable spherical shape. Thus, it is considered that the area of the interface with the first resin (5a) is reduced, and the interval between the second resins (5b) is increased. As a result, the two wrapping films (2, 3) peel off from each other with a weak force in the weak seal portion (9), but the two wrapping films (2, 3) in the resin reservoir portion (12).
The adhesive strength of 3) is significantly higher than that of the weak seal portion (9).

The relationship between the change in the dispersed phase in the peel layer and the ease of resin flow was examined. That is, FIG. 8 shows the result of a comparative test 2 in which the peel strength (adhesive strength) of the peelable package formed by changing the heating temperature of the sealing means between the weakly sealed portion and the resin reservoir is compared. The packaging film used was a film obtained by laminating a 12 μm-thick polyethylene terephthalate resin to a 40 μm-thick peeling film in which a peel layer was formed on one side of a polypropylene resin, and the other was the same as in Comparative Test 1. This is a film in which a polyethylene terephthalate resin having a thickness of 12 μm is bonded to a 40 μm polypropylene resin film. The sealing means was pressurized at 5 kg / cm ² , and the packaging film was pressed between the sealing means for 1.5 seconds.

As is evident from the results of Comparative Test 2, when the sealing temperature is low, the adhesive strength at the resin reservoir is not so high as compared with the weak seal, but when the sealing temperature is increased, the adhesive strength at the resin reservoir is low. The adhesive strength is much higher than the weak seal. This is presumably because the resin flows well as the sealing temperature rises, so that the dispersed phase in the peel layer is easily deformed.

In the first embodiment, the resin reservoir (12)
Are formed in a direction substantially perpendicular to the opening direction and are formed to be long over the entire width of the weak seal portion (9). Therefore, the opening resistance at the resin reservoir (12) can be clearly increased, and the opening operation can be reliably stopped at this position.

In the second embodiment shown in FIG.
(12) are formed on both sides of the weak seal portion (9) except for an intermediate portion in the width direction. For this reason, the unsealed area (10) containing the tablet (7) can be surrounded by the weakly sealed portion (9) without interrupting the periphery thereof, and is securely sealed.

In the weak seal portion (9), in the front portion (9a) of the resin pool portion (12) in the opening direction, the gap between the sealing means is formed by the two wrapping films (2, 3). Although it is narrow enough to be able to be pressed, it is formed wide enough so that a resin pool does not occur around it. Therefore, the resin puddle is not formed on the front end side where the opening of the weak seal portion (9) is started, or the resin puddle is formed only slightly, and when desired, the peelable package (1) can be smoothly opened. it can. On the other hand, in the rear part (9b) of the resin reservoir (12) in the opening direction, the gap between the sealing means is smaller than that in the front part (9a), and the constituent resin of the packaging material flows reliably due to heat compression. The above-mentioned resin reservoir (12)
Is reliably formed.

In the second embodiment, as in the first embodiment, the resin reservoir (12) may be provided at two or more locations in the opening direction. That is, for example, in Modification Example 1 shown in FIG. 10, two resin reservoirs (12) are provided in the opening direction.

Modification 2 of the second embodiment shown in FIG.
The resin pool portion (12) is formed at a portion other than the end portion on the unsealed region (10) side in the width direction of the weak seal portion (9). A wide gap between the sealing means for forming the resin pool (12) is usually formed by providing a concave portion on the surface of the sealing means.
When 2) is formed at the portion excluding the end portion on the unsealed region (10) side, the surface of the sealing means is simpler than when formed at both sides except the widthwise intermediate portion as in the second embodiment. And can be implemented at low cost.

In the third embodiment shown in FIG. 12, the resin reservoir (12) is formed long along the opening direction. For this reason, the welding width of one resin reservoir in the opening direction is narrow, and if the opening force is strong, the resin reservoir (12) also peels off,
In some cases, a part of the packaging film (2) may be broken. Therefore, in order to prevent this, in this embodiment, a plurality of resin reservoirs (12) are formed in parallel with the opening direction so that the opening operation can be reliably stopped at this position.

FIGS. 13 and 14 show a fourth embodiment corresponding to the present invention 2. FIG. 13 is a schematic configuration diagram of a packaging device for a peelable package, and FIG. 14 is a partial front view of the peelable package. .

In the fourth embodiment, for example, as shown in FIG. 13, a peelable package is manufactured in the following procedure. One of the packaging films (2) having the peel layer (5) formed on one surface thereof is brought into contact with a predetermined portion of the preheating roll (22), and only the intermediate portion and subsequent portions in the opening direction after sealing are heated in advance.
It is guided between a pair of die rolls (15, 15). On the other hand, the other packaging film (3) is conveyed horizontally, and the tablets (7) are supplied from the tablet supply device (23) on the packaging film (3), are arranged at predetermined intervals, and are directly placed on the die roll (15).・ 1
5) You will be guided between. In this die roll (15, 15), the two packaging films (2, 3) are overlapped with each other with the tablet (7) sandwiched therebetween, and a peel layer (5) is formed around the tablet (7).
Is heat-pressed to another packaging film (3).

As shown in FIG. 14, a weak seal portion (9) is formed around the tablet by the above-mentioned thermocompression bonding, but the heat treatment portion (2) heated in advance by the preliminary heating roll (22) is used.
In 4), the resin dispersed in the peel layer (5) is deformed in the same manner as in the resin reservoir of the first embodiment, and the weak seal portion is formed.
The adhesive strength is higher than that of the tip side in the opening direction of (9). As a result, when the peelable package (1) is opened, the opening resistance is sharply increased when the package reaches the heat treatment section (24), and the opening operation can be reliably stopped at this predetermined position. .

In the fourth embodiment, the weak seal portion is used.
(9) All the parts after the middle part in the opening direction are preheated. However, the above-mentioned heat treatment part may be formed at least in a part after the middle part in the opening direction.
It may be provided only at the position where the resin reservoir is formed in the embodiment and the like.

Peel strength of the peeled package with the preheated packaging film at the weakly sealed portion and the resin pool portion
FIG. 15 shows the results of Comparative Test 3 in which (adhesive strength) was compared. The packaging film used was a film obtained by laminating a 12 μm-thick polyethylene terephthalate resin to a 40 μm-thick peel film in which a peel layer was formed on one surface of a polypropylene resin, and the other thickness was the same as in Comparative Test 2. This is a film in which a polyethylene terephthalate resin having a thickness of 12 μm is bonded to a 40 μm polypropylene resin film. The sealing temperature was set to 140 ° C., the sealing pressure was set to 5 kg / cm ² , and each packaging film was pressed between the sealing means for 1.5 seconds.

As is clear from the results of Comparative Test 3, the peel strength is higher when preheating is performed than when no preheating is performed, and the value is twice or more higher depending on the preheating conditions. In addition, the adhesive strength at the resin pool
(Peeling strength) is also increased by preheating,
By the combination of this preheating treatment and the formation of the resin reservoir, the adhesive strength (peeling strength) can be significantly increased as compared with the weak seal part, and the opening operation can be reliably stopped at this part. .

In each of the above embodiments, a rectangular packaging film is used. However, the peelable packaging body of the present invention can be applied to packaging films and packaging containers of other shapes such as a circle, and the thickness of the packaging material is also reduced. It can be selected as appropriate. Of course, it goes without saying that the shapes of the weak seal portion and the resin reservoir are not limited to those of the above-described embodiment. In each of the above embodiments, the case where one tablet is packaged is described. However, the peelable package of the present invention is not limited to a plurality of tablets, granules, powders and other pharmaceuticals, but also foods and various tests. The present invention can be applied to articles of various shapes and materials such as tools.

[0062]

Since the present invention is constructed and operates as described above, it has the following effects.

(A) The periphery of the packaged object can be reliably sealed, and the weak seal portion can be easily opened by pulling it off with the knob margin provided at the end when opening. In addition, when the resin is opened to a predetermined position and reaches the resin reservoir of the present invention 1 or the heat-treated portion of the present invention 2, the adhesive resistance of the resin reservoir or the heat-treated portion is higher than that of the weakly sealed portion, so that the opening resistance is rapidly increased. As a result, the position can be clearly recognized, and the opening operation can be reliably stopped at the predetermined position. As a result, while the package can be easily opened to the extent that the package can be taken out, the package is not opened excessively, eliminating the possibility that the package is inadvertently popped out of the package or dropped onto the floor or the like. be able to.

(B) Since a peelable packaging material having the above-described peel layer formed on one entire surface can be used, it is necessary to accurately position the accommodation portion of the packaged object with respect to the peelable packaging material, and to use various shapes. There is no need to prepare many kinds of packaging materials for the objects to be packaged with different sizes, so that it can be implemented simply and inexpensively.

(C) If the resin reservoir is formed to be long in a direction substantially perpendicular to the peeling direction, the welding width of the base resin in the resin reservoir in the opening direction can be increased. Can more clearly increase the opening resistance, and the opening operation can be reliably stopped.

(D) A gap wider than the narrow gap is formed at a portion adjacent to the narrow gap for forming the weak seal between the sealing means and at least a part of the weak seal in the opening direction after the middle. In the case where the formed resin fluidized by the heat compression bonding is flowed into the resin material of the packaging material into the wide gap to form a resin reservoir at this portion, a sealing means having a gap set according to the product shape is used. By using the resin pool, a resin reservoir can be easily formed at a predetermined position, and even if the resin is continuously processed, the packaging can be efficiently performed.

(E) At the time of the heat compression bonding, the gap at the rear of the weak seal portion is wider than the gap between the sealing means at the front than the wide gap in the opening direction. In the case where both the packaging materials are thermocompression-bonded by narrowing, the flow of the constituent resin of the packaging material is small in the thermocompression bonding at the front part, and the resin pool is hardly formed on the leading end side where opening is started. In addition to smooth sealing,
The rear portion is heated and pressed by the sealing means having a narrower gap, so that the resin reservoir portion is reliably formed, so that the opening operation can be reliably stopped at the resin reservoir portion.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of the present invention used for packing tablets, FIG. 1 (a) is a perspective view of a peelable package, and FIG. 1 (b) is an enlarged view of a portion B in FIG. 1 (a). FIG.

FIG. 2 is a front view of the peelable package body showing a continuous state.

FIG. 3 is an estimated diagram in which a cross section near a resin reservoir is enlarged.

FIG. 4 is an explanatory view showing a modification of the gap of the sealing means.

FIG. 5 is a test result of a comparative test 1 in which the peel strength (adhesion strength) at the resin reservoir when the sealing conditions are changed is compared.

FIG. 6 is a perspective view illustrating an example of an opening operation of the peelable package.

7A and 7B show a modified example of the first embodiment. FIG. 7A is an enlarged cross-sectional view of a cross section near a resin reservoir, and FIG.
It is an enlarged view of the B section of (a).

FIG. 8 is a test result of a comparative test 2 in which the peel strength (adhesion strength) between the weak seal portion and the resin reservoir is compared when the heating temperature of the sealing means is changed.

FIG. 9 is a partial front view of the peelable package, showing the second embodiment.

FIG. 10 is a partial front view of a peelable wrapping body showing Modification Example 1 of the second embodiment.

FIG. 11 is a partial front view of a peelable package showing Modification 2 of the second embodiment.

FIG. 12 is a partial front view of a peelable package showing a third embodiment.

FIG. 13 is a schematic configuration diagram of a peeling package packaging apparatus showing a fourth embodiment corresponding to the second invention.

FIG. 14 is a partial front view of a peelable package according to a fourth embodiment.

FIG. 15 shows the results of a comparative test 3 in which the peel strength (adhesive strength) of a peelable package made of a preheated packaging film was compared between a weakly sealed portion and a resin reservoir.

FIG. 16 is a front view of a peelable package showing a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Peelable package, 2 ... One packaging material (wrapping film), 3 ... The other packaging material (wrapping film), 5 ... Peel layer, 5a ... 1st resin which forms the continuous phase of a peel layer, 5b ... Second resin forming dispersed phase of peel layer, 7: packaged object (tablet), 9: weak seal portion, 9a: front portion of weak seal portion in opening direction, 9b: opening of weak seal portion Rear part in the direction, 12 ... resin pool part, 24 ... heat treatment part.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3E067 AA13 AB81 AC01 BA31A BB14A BB15A BB16A BB22A BB26A BC04A CA24 EA09 EB01 EB11 FA01 FC01 GD07 GD08

Claims (7)

[Claims] 1. A package (7) is formed by forming a peel layer (5) on at least one surface of at least one packaging material (2), and heating and pressing this peel layer (5) to another packaging material (3). ), A weak seal portion (9) is formed, and a part of the constituent resin of the packaging material (2) flows by heating to at least a part of the weak seal portion (9) in the opening direction after the middle portion. The resin pool (12) collected by the above is formed, and the adhesive strength of the resin pool (12) is reduced by the weak seal portion.
A peelable package characterized by being higher than (9). 2. The peel layer (5) is formed on one side of the base resin layer (4) of the packaging material (2), and the peel layer in the resin reservoir (12) is formed by the flow caused by the heating.
(5) is disturbed, and the base resin of the resin reservoir (12) is transferred to the other packaging material (3) through the disturbed portion of the peel layer (5).
The peelable package according to claim 1, wherein the adhesive strength of the resin reservoir (12) is increased by directly welding the resin package. 3. The peel layer (5) comprises a first resin (5a) forming a continuous phase and a second resin (5) dispersed in the first resin.
b), the second resin (5b) dispersed in the first resin (5a) is deformed by the flow caused by the heating in the resin pool (12), and the resin pool (12) The peelable package according to claim 1, wherein the adhesive strength of the package is increased. 4. The resin sealing portion (12) is connected to the weak seal portion.
The peelable package according to any one of claims 1 to 3, wherein the package is formed to be long in a direction substantially perpendicular to the peeling direction of (9). 5. A package (7) is formed by forming a peel layer (5) on at least one surface of at least one of the packaging materials (2) and heat-pressing the peel layer (5) to another packaging material (3). ), A weak seal portion (9) is formed around the first resin (5a) forming a continuous phase and the second resin (5b) dispersed in the first resin. The second resin (5b) dispersed in the first resin (5a) is deformed by applying a heat treatment to at least a part of the weak seal portion (9) in the opening direction after the middle portion in the opening direction. Heat treatment part (24)
A peelable package characterized in that the adhesive strength is higher than that of the front end portion in the opening direction of the weak seal portion (9). 6. A packaged object (7) between a peelable packaging material (2) having a peel layer (5) formed on one side and another packaging material (3).
Are placed, and the two packaging materials (2
3) is guided and passed between the pair of sealing means (15, 15), and the gap between the sealing means (15, 15) is narrowed around the article to be packaged (7), so that the packaging material (2) (3) By heat-pressing 3), a weak seal portion (9) is formed around the packaged object (7), and a weak seal portion (9) is formed between the sealing means (15, 15). A portion adjacent to the gap (16) and the weak seal portion (9)
A gap (17) wider than the narrow gap (16) is formed in at least a part of the middle portion and subsequent portions in the opening direction of the packaging material. 17) A peel packaging method characterized by forming a resin reservoir (12) in this portion by flowing into the inside. 7. In the weak seal portion (9), compared with the gap between the sealing means (15, 15) at the front portion (9a), compared with the wide gap (17) in the opening direction, By narrowing the gap at the rear part (9b) rather than the wide gap (17), the above both packaging materials (2.3)
The peelable packaging method according to claim 6, wherein the pressure-sensitive adhesive sheet is heated and pressed.