JP2003285806A - Sealing packaging method, sealed packaged item, removing method for sealing packaging - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealing packaging method capable of effectively making a cap close contact with a mouth portion of a container and sealing it, a sealed packed item obtained by the sealing packaging method and a removing method for sealing packaging capable of easily removing the cap. <P>SOLUTION: In the sealing packaging method, the mouth portion of the container main body is covered with the cap, covering at least the container main body and the cap with a heat shrinkable adhesive sheet comprising a heat shrinkable film and an adhesive layer or covering the container main body with the heat shrinkable adhesive sheet having the cap on the adhesive layer so that the mouth portion is covered with the cap, plastering them with the adhesive layer and heat-shrinking the film to bring the cap into tight contact with the mouth portion and seal it. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention utilizes a heat-shrinkability of a heat-shrinkable film with a pressure-sensitive adhesive layer to tightly seal and seal a cap at the mouth of a container body, and its sealing. The present invention relates to a sealed package removing method for removing a sealed package and a cap obtained by the packaging method together with a heat shrinkable film.

[0002]

2. Description of the Related Art Conventionally, in the fields of industrial products, pharmaceuticals, food products, etc., a container is filled with a substance such as liquid or powder, and after the container is capped, the package such as the container is covered with a heat shrink film,
BACKGROUND ART A package is protected by heat-shrinking and bringing a heat-shrinkable film into close contact with the package. For example, in a container with a cap such as a bottle with a lid, after filling the content in the mouth part that is threaded on the outside, the mouth part is capped with a cap that is threaded on the inside. Between the bottom of the container and the top of the cap by wrapping it around the body of the container with a heat-shrink film that is slightly longer than the length between the bottom of the container and the top of the cap. A protective film was attached so as to be in close contact with the entire container. However, in this case, since the protective film covers the entire container, a large amount of the film is required, and when the film is heat-shrinked, it is necessary to blow hot air as a whole, which is energy efficient. Also has a problem. Furthermore, if the cap is a threaded cap, when removing the contents of the container with a cap to which the protective film is closely attached, remove all the protective film covering the cap and turn the cap to remove it. Since it is required, there is a problem that the operation is troublesome.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a sealed packaging method capable of efficiently shrinking and shrinking a heat shrinkable film so that a cap can be closely attached and sealed to the mouth of a container body, and the sealed packaging. An object of the present invention is to provide a sealed package obtained by the method and a sealed package removing method capable of easily removing the cap.

[0004]

As a result of intensive studies to solve the above problems, the present inventors have found that a heat-shrinkable pressure-sensitive adhesive sheet comprising a heat-shrinkable film and a pressure-sensitive adhesive layer is used for at least the container body and the cap. It was found that the above-mentioned problems can be achieved by attaching and, and heat-shrinking the film, and completed the present invention.

That is, according to the present invention, the mouth of the container body is covered with a cap, the container body and the cap are attached with a heat-shrinkable pressure-sensitive adhesive sheet comprising a heat-shrinkable film and an adhesive layer, and the film is heat-shrinked, The sealing and packaging method is characterized in that the shrinkage causes the cap to be brought into close contact with the mouth portion for sealing. Further, the present invention is composed of a heat-shrinkable film and a pressure-sensitive adhesive layer, a heat-shrinkable pressure-sensitive adhesive sheet having a cap on the pressure-sensitive adhesive layer side is attached to a container so that the cap covers the mouth of the container body, The present invention provides a method for sealing and packaging, which comprises heat-shrinking the film and bringing the cap into close contact with the mouth portion to seal the film. Further, the present invention provides the above-mentioned sealing and packaging method, wherein the heat-shrinkable pressure-sensitive adhesive sheet attached has a non-adhesive portion at an end thereof. The present invention also provides a sealed package obtained by any one of the above sealed packaging methods. Furthermore, the present invention peels off the heat-shrinkable pressure-sensitive adhesive sheet attached to the obtained sealed package,
The present invention provides a method for removing a sealed package, which comprises removing the cap in a state of being attached to the heat-shrinkable pressure-sensitive adhesive sheet. Hereinafter, the present invention will be described in detail.

[0006]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described below with reference to the drawings. Heat-shrinkable pressure-sensitive adhesive sheet 1 used in the present invention
Is composed of a heat-shrinkable film 2 and an adhesive layer 3. The heat-shrinkable film 2 is not particularly limited, and examples thereof include a heat-shrinkable film made of a polyester resin, a polyethylene resin, a polypropylene resin, a polystyrene resin, a polyvinyl chloride resin, a filler or a dye for these resins. , A heat-shrinkable film containing a colorant such as a pigment. Among these, a heat shrinkable film of polyester resin is preferable from the viewpoints of strength, deformation resistance, durability, price and the like. Preferred examples of the polyester resin include polyethylene terephthalate resin and polybutylene terephthalate resin. Heat shrink film 2
Is the longitudinal direction (the direction of the arrow in FIG. 1, also referred to as the TD direction) and the width direction (the direction perpendicular to the longitudinal direction, M
Although it may shrink in both directions (also referred to as D direction), it is necessary that it shrinks in at least the longitudinal direction. The shrinkage rate in the longitudinal direction of the heat shrinkable film 2 is preferably a film having a shrinkage rate of 5 to 70%, particularly 10 to 60% in 30 seconds in a 90 ° C. atmosphere. Heat shrink film 2
The shrinkage rate in the width direction is preferably smaller than the shrinkage rate in the longitudinal direction of the heat-shrinkable film 2, and is preferably 10% or less in 30 seconds in a 90 ° C. atmosphere.

The thickness of the heat shrink film 2 is 20 to 200.
μm is preferable, and 30 to 100 μm is particularly preferably used. The heat-shrinkable film 2 may be transparent or may be colored. The length in the longitudinal direction of the heat-shrinkable film 2 should be such that it can cover at least part of one surface of the container body 5 and at least part of one surface of the opposite side of the cap 6 and the container body 5. Good. The length in the longitudinal direction of the heat-shrinkable film 2 may be a length that can cover the bottom portion of the container body 5, but can cover the entire one surface from the upper end to the lower end of the one surface portion of the container body 5. It may be shorter than the length. The length of the heat-shrinkable film 2 in the width direction is preferably 1/4 to 3 times the width of the cap 6,
It is particularly preferable that the width of the cap 6 is 1/2 to 2 times.

Reference numeral 3 denotes an adhesive layer, which is provided for attaching the heat-shrinkable adhesive sheet 1 to a container. The adhesive layer 3 is
It is necessary to provide the heat-shrinkable pressure-sensitive adhesive sheet 1 at a position where the heat-shrinkable pressure-sensitive adhesive sheet 1 can be attached to at least a part of one surface of the container body 5 and at least a part of the one surface of the cap 6 opposite to the container body 5. The agent layer 3 may be provided on almost the entire surface of the heat shrinkable film 2. As the pressure-sensitive adhesive used for the pressure-sensitive adhesive layer 3, various pressure-sensitive adhesives can be used. For example, acrylic adhesive, silicone adhesive, rubber adhesive,
Examples thereof include polyester adhesives. If necessary, a tackifier, a filler, a softening agent, an antioxidant, an ultraviolet absorber, a cross-linking agent and the like can be added to the above-mentioned pressure-sensitive adhesive. Examples of the tackifier include rosin resin, terpene phenol resin, terpene resin, aromatic hydrocarbon-modified terpene resin, petroleum resin, coumarone indene resin, styrene resin, phenol resin, xylene resin and the like. Examples of the filler include zinc white, titanium oxide, silica, calcium carbonate, barium sulfate and the like. Examples of the softening agent include process oil, liquid rubber, plasticizer and the like. Examples of the antioxidant include anilide type, phenol type, phosphite type, thioester type and the like.
Examples of the ultraviolet absorber include benzophenone type and benzotriazole type, and examples of the crosslinking agent include epoxy type, isocyanate type, metal chelate type and the like. The thickness of the pressure-sensitive adhesive layer 3 is usually 5 to 100 μm, preferably 10 to 50 μm.

The adhesive strength of the adhesive layer 3 to the adherend is 3
-20 N / 25 mm is preferable, and 4-15 N / 2.
A range of 5 mm is more preferable. When the adhesive strength is within the above range, the heat-shrinkable adhesive sheet 1 can be sufficiently fixed to the container body 5, and can be easily peeled off when peeled off.
When peeling, the heat-shrinkable pressure-sensitive adhesive sheet 1 can be peeled off with the cap 6 still attached. The heat-shrinkable adhesive sheet 1
You may provide the non-adhesive part 4 at the edge part. By providing the non-adhesive portion 4, the heat-shrinkable adhesive sheet 1 attached to the container can be easily peeled off. The non-adhesive portion 4 may be one end or both ends in the longitudinal direction of the heat-shrinkable adhesive sheet 1. The length of the non-adhesive portion 4 may be any length as long as it can be easily grasped, and is not particularly limited, but 20 mm or less is preferable. The non-adhesive part 4 is a method in which the adhesive layer 3 is not provided on the end of the heat-shrinkable film 2, the heat-shrinkable adhesive sheet 1
It can be formed by a method of printing on the pressure-sensitive adhesive layer 3 at the end of with a non-sticky ink or the like. The surface or the back surface of the heat-shrinkable film 2 used in the present invention can be provided with characters, figures, symbols or the like by various printing. In particular, it is preferable that the heat shrinkable film 2 be printed with an arrow or the like indicating the peeling direction.

In the sealing and packaging method of the present invention, the mouth portion 7 of the container body 5 is covered with the cap 6, and then at least one surface of the container body 5, the cap 6 and the container body 5 are covered with the heat-shrinkable adhesive sheet 1. Is covered with an adhesive layer 3, and hot air is blown onto the cap 6 and its surroundings to cause heat shrinkage, and the film shrinkage causes the cap 6 to adhere to the mouth portion 7 for sealing. is there. The length of the adhesive layer 3 in the longitudinal direction of the attachment portion of the heat-shrinkable adhesive sheet 1 attached to one surface of the container body 5 is preferably 10 mm or more, 15
mm or more is preferable. The container used in the present invention includes containers having various shapes. Also, the container body 5
The shape of one surface is not particularly limited as long as the heat-shrinkable pressure-sensitive adhesive sheet 1 can be attached, but a flat surface or a substantially flat surface is preferable. The material of the container used is not particularly limited, and synthetic resin,
Examples include various materials such as glass and metal.

It is preferable that the cap 6 has a shape and a structure capable of tightly closing the mouth 7 by pressing so as not to leak the contents when it is attached to the mouth 7. The external shape of the cap 6 is not particularly limited, and examples thereof include a cylindrical shape, a spherical shape, and a polygonal prism shape. The inside of the cap 6 may be hollowed out according to the shape of the mouth portion 7 or may be like a rubber plug. in short,
Any material may be used as long as it can be brought into close contact with the mouth portion 7 and can be covered by the pressing force due to the shrinkage of the heat shrinkable film 2. The height of the cap 6 can be set to various heights, but is preferably 3 mm or more, particularly preferably 5 mm or more. By having a certain height, it is possible to utilize the shrinking force of the heat shrinkable film 2 that is not attached to the cap 6 or the container body 5. The material of the cap 6 is not particularly limited, but it is preferable that the portion that comes into contact with the mouth portion 7 of the container has good adhesiveness. Examples of such a material include a synthetic resin softer than the material of the mouth portion 7 of the container. Materials such as rubber may be used.

As shown in FIG. 1, after the heat-shrinkable pressure-sensitive adhesive sheet 1 is attached to the container as described above, the heat-shrinkable pressure-sensitive adhesive sheet 1 is heat-shrinked in the cap 6 and its periphery. The heat shrinkage is performed by blowing hot air onto the cap 6 and its surroundings. As the medium for the hot air, heated air is preferably mentioned, but a medium obtained by heating an inert gas such as nitrogen can also be used. The temperature of hot air is preferably 80 ° C or higher. The upper limit of the temperature of the hot air is preferably equal to or lower than the melting point of the heat shrinkable film 2, and more preferably 120 ° C or lower. The blowing time of hot air depends on the temperature, but is usually several seconds to several minutes. The hot air blowing place is preferably the cap 6 and its surroundings, but may be beyond that. Further, another sealing and packaging method of the present invention is the mouth portion 7 of the container body 5.
The heat-shrinkable pressure-sensitive adhesive sheet 1 having the cap 6 on the pressure-sensitive adhesive layer 3 side covers at least one surface of the container main body 5, the mouth portion 7, and the other surface of the container main body 5 on the opposite side so that the cap 6 covers The adhesive layer 3 is applied, and hot air is blown onto the cap 6 and its periphery to cause thermal contraction, and the cap 6 is brought into close contact with the mouth portion 7 by the film contraction and sealing.

In this case, the heat-shrinkable adhesive sheet 1 used
As shown in FIG. 3, the cap 6 is previously attached to the surface of the pressure-sensitive adhesive layer 3. The heat-shrinkable pressure-sensitive adhesive sheet 1 may be attached in the order of the one surface portion of the container body 5, the mouth portion 7, and the one surface portion on the opposite side of the container body 5, but the cap portion 6 is first covered with the cap portion 7, After that, it is preferable to stick the heat-shrinkable pressure-sensitive adhesive sheet 1 to both sides of the container body 5 because the positioning of the sticking to the container body 5 becomes easy. Other parts in this sealing and packaging method are the same as above. In the sealed package obtained by the sealed packaging method of the present invention, the heat-shrinkable film 2 may be attached to at least a part of the side surface of the cap 6 via the adhesive layer 3.

Further, the method for removing sealed packaging of the present invention is the heat-shrinkable pressure-sensitive adhesive sheet 1 attached to the obtained sealed packaging body.
Is removed, and the cap 6 is removed with the cap 6 attached to the heat-shrinkable pressure-sensitive adhesive sheet 1. Thereby, the cap 6 can be opened by one operation. The heat-shrinkable pressure-sensitive adhesive sheet 1 attached to one surface of the container body 5 of the sealed package preferably has a non-adhesive portion 4 at the end. The non-adhesive portion 4 is not fixed to one surface portion of the container body 5 and can be easily grasped when peeled off, and the heat-shrinkable adhesive sheet 1 is easily peeled off. Since the heat-shrinkable film 2 has the pressure-sensitive adhesive layer 3, the heat-shrinkable film 2 can be peeled off together with the cap 6 and then the cap 6 can be attached again to be attached. Also in this case, the cap 6 can be operated by one operation.
Can be closed.

[0015]

EXAMPLES The present invention will now be described in more detail by way of examples, which should not be construed as limiting the invention. The methods for measuring the properties of the heat-shrinkable film and the properties of the sealed package used in the examples are shown below. (1) Heat shrinkage rate Heat shrinkable film is 110 mm in MD direction and 110 in TD direction.
Cut into squares of mm, about 100 mm in each direction
Was marked, and the measured value (A) of the marked line was measured.
Then, the heat shrink film is left in a constant temperature bath at 90 ° C. for 30 seconds, and the marked line distance (B) after taking out is measured. The value of the following calculation formula was defined as the shrinkage rate. Shrinkage rate (%) = (A−B) / A (2) Adhesive strength The adherend is a polyethylene terephthalate plate, and JIS
Based on Z0237, the adhesive strength 24 hours after application was measured.

(3) Sealability The sealed packages obtained in the examples were left at room temperature for 24 hours with the cap facing down, and the contents of water were visually observed for leakage, and the following criteria were used. It was evaluated by. ○: Water leakage of the contents was not confirmed. X: Water leakage of the contents was confirmed.

(4) A rectangular heat-shrinkable pressure-sensitive adhesive sheet (length 50 mm, width 50 mm) is attached to a polyethylene terephthalate plate which is a removable adherend,
The heat-shrinkable pressure-sensitive adhesive sheet was peeled off by hand peeling after being left in a constant temperature bath at 90 ° C. for 30 seconds and left at room temperature for 24 hours, the ease of peeling was detected, and the state of the pressure-sensitive adhesive was visually observed. It evaluated by the standard of. ◯: The adhesive does not transfer to the adherend and is easy to peel off by hand. Δ: The adhesive was slightly transferred to the adherend, or the peeling feeling due to peeling by hand was rather strong. X: The adhesive cannot be peeled off because the adhesive is transferred to the adherend or the peeling feeling due to peeling by hand is strong. (5) In the method of measuring cap removability and sealing property, when peeling the heat-shrinkable pressure-sensitive adhesive sheet attached to the sealed package, it is observed whether or not the cap is peeled at the same time. evaluated. ◯: The cap was removed together with the heat-shrinkable pressure-sensitive adhesive sheet. X: Only the heat-shrinkable pressure-sensitive adhesive sheet was peeled off, and the cap remained.

(Example 1) As a heat-shrinkable film, a shrinkage ratio of 56% in the longitudinal direction (TD direction) and a shrinkage ratio in the width direction (MD direction) of 45 μm in an atmosphere of 90 ° C. for 30 seconds were set to 5.
The peeling direction was printed on the surface (longitudinal direction) of a 6% polyethylene terephthalate film (manufactured by Toyobo Co., Ltd., trade name "PET45 S7224"). On the other hand, an acrylic adhesive (manufactured by Toyo Ink Mfg. Co., Ltd.) and a product name “Olivine BPS384” on a release sheet (manufactured by Toyo Metallizing Co., Ltd., product name “Serapeal 38S Matt”)
1 ", solid content 46% by mass) and 100 parts by mass of an isocyanate crosslinking agent (manufactured by Toyo Ink Mfg. Co., Ltd., trade name" BPS
3841B ", solid content 81% by mass) 4 mass% of the mixed adhesive is applied using a bar coater, and the dry coating thickness is 25μ.
A release sheet with a pressure-sensitive adhesive layer provided with the acrylic pressure-sensitive adhesive layer of m was obtained. To the pressure-sensitive adhesive layer of this release sheet, the surface of the heat-shrinkable film on which the polyethylene terephthalate film has not been printed is adhered, and one end (length: 10 mm) in the longitudinal direction of the heat-shrinkable film has no pressure-sensitive adhesive layer. A shrinkable pressure-sensitive adhesive sheet (100 mm in length in the longitudinal direction and 30 mm in width) was prepared. Adhesive strength is 6.3N / 25
It was mm. These properties are shown in Table 1.

Next, a container body filled with water (made of polyethylene terephthalate, bottom length 45 mm, bottom width 20)
mm, rectangular parallelepiped with a height of 50 mm) (outer diameter 8 m)
m, cylindrical shape of 7 mm in height) with a cap (made of rubber, outer diameter of 13 mm, height of 8 mm, cylindrical shape of wall thickness of 2 mm), and then the heat-shrinkable adhesive sheet from which the release sheet has been removed Cover one surface portion, one surface portion on the opposite side of the cap and the container body, and attach as shown in FIG. 1 with the adhesive layer (the adhesive length of the adhesive layer in the longitudinal direction is 27 mm for both surface portions),
Hot air (heated air) at 95 ℃ is applied to the cap and its surroundings 3
The film was blown for 0 seconds to cause heat shrinkage, and the film shrinkage brought the cap into close contact with the mouth portion for sealing, to obtain a sealed package as shown in FIG. Using the obtained sealed package, the attached heat-shrinkable pressure-sensitive adhesive sheet was removed and peeled off together with the cap. Table 1 shows the properties of the sealed package.

(Example 2) As a heat-shrinkable film, a shrinkage ratio of 15% in the longitudinal direction (TD direction) and a shrinkage ratio in the width direction (MD direction) in a thickness of 45 μm and an atmosphere of 90 ° C. for 30 seconds were 2.
A sealed package was obtained in the same manner as in Example 1 except that a 6% polyethylene terephthalate film (trade name "PET45 LX-10S" manufactured by Mitsubishi Plastics, Inc.) was used, and the obtained sealed package. Was used to remove the attached heat-shrinkable pressure-sensitive adhesive sheet, and it was peeled off together with the cap. Table 1 shows the properties of the heat-shrinkable film and the sealed package.

[0021]

[Table 1]

(Example 3) Heat shrink film (longitudinal direction 1)
00mm, width direction 30mm) to provide an adhesive layer on the entire surface,
Both ends of the film in the longitudinal direction (length: 10 m
m) A cap (rubber, outer diameter 13 mm, height 8 mm, wall thickness 2 mm) is formed in the center of the pressure-sensitive adhesive layer of the film in which a non-tacky portion is provided by printing with ink on the surface of the pressure-sensitive adhesive layer. A heat-shrinkable pressure-sensitive adhesive sheet similar to that in FIG. 3 was prepared in the same manner as in Example 1 except that the (shape) was attached in advance. The properties of the heat-shrinkable film were the same as in Example 1. Next, the mouth (outer diameter 8 mm, height 7) of the container body (made of polyethylene terephthalate, rectangular shape with a bottom length of 45 mm, a bottom width of 20 mm, and a height of 50 mm) filled with water was used.
mm cylindrical shape) with a cap attached to the heat-shrinkable pressure-sensitive adhesive sheet, and then cover one surface of the container main body and one surface of the opposite side of the cap and the container main body on both sides of the heat-shrinkable adhesive sheet, Stick with the adhesive layer (bonding length of the adhesive layer in the longitudinal direction is 22 mm on both sides), blow hot air (heating air) at 95 ° C for 30 seconds on the cap and its surroundings to cause heat shrinkage, and shrink the film. The cap was brought into close contact with the mouth portion and sealed to obtain a sealed package. Using the obtained sealed package, the attached heat-shrinkable pressure-sensitive adhesive sheet was removed and peeled off together with the cap. The properties of the sealed package were the same as in Example 1.

[0023]

According to the method of sealing and packaging of the present invention, the heat-shrinkable pressure-sensitive adhesive sheet can be heat-shrinked, and the cap can be efficiently brought into close contact with and sealed to the mouth of the container body. Moreover, the cap can be easily removed by the method for removing sealed packaging of the present invention.

[Brief description of drawings]

FIG. 1A is a perspective view showing a state in which a heat-shrinkable pressure-sensitive adhesive sheet is covered on a container, and B is a side view thereof.

FIG. 2A is a perspective view showing an embodiment of a sealed package obtained by the sealed packaging method of the present invention, and B is a side view thereof.

FIG. 3 is a perspective view of a heat-shrinkable pressure-sensitive adhesive sheet to which a cap used in the present invention is attached.

[Explanation of symbols]

1 Heat-shrinkable adhesive sheet 2 Heat shrink film 3 Adhesive layer 4 Non-adhesive part 5 container body 6 caps 7 mouth

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3E067 AA03 AA05 AB01 AB81 BA01A                       BB08A BB11A BB14A CA01                       EA11 EA24 EA33 EB15 EB17                       EB27 GD06 GD08                 3E084 AA05 AA12 BA01 BA10 CA03                       CC03 DA03 DC03 FA09 FD13                       GA10 GB08

Claims (5)

[Claims] 1. A container body is covered with a cap, the container body and the cap are attached with a heat-shrinkable pressure-sensitive adhesive sheet comprising a heat-shrinkable film and an adhesive layer, and the film is heat-shrinked.
A sealing and packaging method, characterized in that the shrinkage causes the cap to be brought into close contact with the mouth portion for sealing. 2. A heat-shrinkable pressure-sensitive adhesive sheet, which comprises a heat-shrinkable film and a pressure-sensitive adhesive layer and has a cap on the pressure-sensitive adhesive layer side, is attached to a container so that the cap covers the mouth of the container body. A method for sealing and packaging, which comprises heat-shrinking a film and bringing the cap into close contact with the mouth portion to seal the film. 3. The sealed packaging method according to claim 1, wherein the heat-shrinkable pressure-sensitive adhesive sheet attached has a non-adhesive portion at an end thereof. 4. A sealed package obtained by the sealed packaging method according to claim 1. 5. A sealing characterized in that the heat-shrinkable pressure-sensitive adhesive sheet attached to the sealed package obtained in claim 4 is peeled off, and the cap is attached to the heat-shrinkable pressure-sensitive adhesive sheet and removed. Packaging removal method.