JP7106948B2 - Bag, package, method for manufacturing package, method for opening package, and device for forming tear band - Google Patents

Description

TECHNICAL FIELD The present invention relates to a bag made of a thermoplastic synthetic resin film and a package containing an object to be contained in the bag, and more particularly to a bag and package having a tear strip for opening. More specifically, the present invention relates to a bag and a package suitable for being opened in a high-cleanliness environment such as a clean room when the object to be contained is a part of a semiconductor manufacturing apparatus. The present invention also relates to a method for manufacturing the package, a tear band forming device for forming a tear band in the packing bag, and a method for opening the package.

2. Description of the Related Art When a semiconductor is manufactured using a semiconductor manufacturing apparatus, a deposit called a deposition film adheres to the surfaces of parts of the semiconductor manufacturing apparatus. Therefore, after removing the component from the semiconductor manufacturing apparatus and dissolving or disintegrating/peeling off the deposits, final cleaning (precision cleaning) is performed using ultrapure water, ultrasonic waves, or the like in a highly clean environment.

In order to maintain the cleanliness of precision-cleaned parts, we place the precision-cleaned parts in a highly airtight packing bag, remove the air from the bag, seal it with a heat-sealing machine, and send it to the semiconductor manufacturing factory. transport.

A packaging bag sealed by a heat-sealing machine is opened in a clean room or other high-cleanliness environment. This packing bag cannot be easily torn open by hand, and is opened using a cutter or scissors. The use of cutters and scissors may not only damage or break the parts, but also cause contamination (metal contamination) or the operator's hand to be accidentally cut.

Patent Documents 1 to 3 describe that a packing bag is provided with a tear strip that can be easily opened by hand.

Patent Literature 1 describes a packaging film provided with a tear strip formed by arranging concave portions in a row by an embossing roller. Patent Literatures 2 and 3 describe packaging bags in which opening lines are formed by providing cuts or perforated cuts.

JP 2009-154905 Japanese Patent Laid-Open No. 8-268467 Real open 4-89760

SUMMARY OF THE INVENTION An object of the present invention is to provide a bag and a package that can be easily opened and manufactured, a method for manufacturing and opening the package, and a tear band forming apparatus.

The bag of the present invention is a bag made of a thermoplastic synthetic resin film having an inlet, in which at least a part of the side opposite to the inlet is provided with a cleavage zone, and the cleavage zone is an extension of the cleavage zone. At least a part of each recess is a groove extending in an oblique direction with respect to the extending direction of the cleaved band, and the depth of the recess is in the longitudinal direction of the recess. It is characterized by change. Note that one end of the rupture strip starts from one side of the pouch.

The package of the present invention is a package comprising a bag made of a thermoplastic synthetic resin film, in which an object is contained, wherein at least a part of the bag is provided with a cleavable band, and the cleavable band is formed by the cleaving It consists of a plurality of recesses arranged in the extending direction of the band, at least a part of each recess is a groove extending in an oblique direction with respect to the extending direction of the cleaved band, and the depth of the recess is a recess It is characterized in that it changes in the longitudinal direction of the

A package according to one embodiment of the present invention is obtained by enclosing an object in the bag of the present invention.

It is preferable that the recess is deepest at a midway portion in the longitudinal direction of the recess, and gradually becomes shallower from the midway portion toward both end sides of the recess.

The percentage d ₁ /t ₁ ×100 (%) of the depth d ₁ of the deepest portion of the recess to the thickness t ₁ of the film is preferably 50 to 667%.

The crossing angle θ between the extending direction D ₁ of the cleaved band and the extending direction D ₂ of the groove is preferably 5 to 30°.

The ratio L ₁ /t ₁ of the linear distance L ₁ from one longitudinal end to the other longitudinal end of the recess and the thickness t ₁ of the film is preferably 8-117. It is preferable that the recess extends in an S shape.

In one aspect of the present invention, the film on one side of the bag and the film on the other side of the bag are welded at the concave portion and its peripheral portion, and the width T of the welded portion at the peripheral portion and the thickness of the film are The ratio T/t ₁ to t ₁ is preferably 0.3 to 10, particularly preferably 0.5 to 5.8.

The cleavage band forming device of the present invention comprises a base and a movable body capable of moving toward and away from the base for sandwiching the thermoplastic synthetic resin film, and at least one of the base and the movable body, and A cleavage band forming device having a heat wire to be pressed against a film, wherein the heat wire consists of a main wire extending linearly and a secondary wire spirally wound around the main wire, or a plurality of wires. It is characterized in that it is made by twisting the strands of

In this cleavage band forming device, it is preferable that the main wire has a wire diameter of 0.3 to 0.5 mm and the secondary wire has a wire diameter of 0.2 to 0.5 mm.

The method for manufacturing the package of the present invention comprises a housing step of housing an object to be contained in the bag of the present invention, and a sealing step of sealing the entrance of the bag by forming a heat-sealed portion with a heat-sealing device. .

In the manufacturing method of the package, it is preferable that the inside of the bag is evacuated after the accommodating step, and then the sealing step is performed.

A method for manufacturing a package according to another aspect of the present invention is a method for manufacturing a package in which an object is enclosed in a synthetic resin bag and a tear band for opening is formed, wherein one end and the other end are and a first step of sealing the one end of the cylindrical synthetic resin film by forming a first heat sealing portion with a heat sealing device a sealing step of , an evacuation step of evacuating the inside of the cylindrical synthetic resin film, and a second heat sealing portion of the cylindrical synthetic resin film by forming a second heat seal portion with a heat sealing device to seal the other end of the cylindrical synthetic resin film. 2 sealing step, and one of the first and second heat-sealed portions (hereinafter referred to as heat-sealed portion A) or on the side of the object from the heat-sealed portion A, this a cleavage band forming step of forming the cleavage band before, during, or after the formation of the heat-sealed portion A, and the accommodation step of the object to be accommodated is before the exhaust step and the first It is characterized in that it is performed before or after the formation of the heat-sealed portion.

The method for opening the package of the present invention involves applying a tensile force to the package of the present invention in an environment higher in cleanliness than ISO 7 class according to ISO standard 14644-1 (JIS compliant) to open the cleavage band. It is characterized by opening by cleaving.

In the present invention, the tear band of the bag has a plurality of recesses arranged in the extending direction of the tear band. At least a part of the recess has a groove shape obliquely crossing the extending direction of the cleft band, and the depth of the recess varies in the longitudinal direction of the recess (that is, the depth of the recess varies in the longitudinal direction of the recess). is not uniform at ).

Therefore, when a tensile force is applied to the cleavage band of the package, stress is locally concentrated on a part of the recess, and tearing starts in that part, and this cleavage spreads over the entire recess and further the cleavage band, and the package is packed. body is unsealed.

The package of the present invention requires less force for unsealing than the conventional example (for example, Patent Document 1) in which the depth of the concave portion is constant, and is easy to unseal.

The bag and package of the present invention are suitable as a vacuum package for semiconductor manufacturing equipment parts, liquid crystals, electronic component manufacturing equipment parts, etc., and this package can be used in a highly clean environment such as a clean room or a clean bench. It can be easily opened without using cutters, scissors, etc.

The cleanliness of the high-cleanliness environment is preferably higher than ISO7 class (class 10,000), more preferably higher than ISO6 class (class 1,000). Such environments include clean rooms and clean benches.

According to the cleavage band forming device of the present invention, such a cleavage band can be easily formed.

1 is a front view of a package according to an embodiment; FIG. 2 is an enlarged view of part of the package of FIG. 1; FIG. 3 is an enlarged sectional view along line III-III of FIG. 2; FIG. FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. 3; It is explanatory drawing which shows the manufacturing method of a package. FIG. 3 is an explanatory view showing a cleavage band forming device; It is a top view of a heat wire. 1A is a front view of a bag according to an embodiment, and FIG. 1B is a schematic enlarged cross-sectional view taken along line BB of FIG. 1A is a front view of a bag according to an embodiment, and FIG. 1B is a schematic enlarged cross-sectional view taken along line BB of FIG. It is a front view of the package which concerns on another embodiment.

Embodiments will be described below with reference to the drawings. FIG. 1 is a front view of a package 1 according to an embodiment, in which an object C is vacuum-sealed in a bag 2 made of a thermoplastic synthetic resin film. Examples of thermoplastic synthetic resin films include polyethylene, polypropylene, polystyrene, polyvinyl chloride, or nylon films, and films in which these thermoplastic synthetic resins are placed on the inside and used as a sealant, etc., but are limited to these. not.

A heat-sealed portion 3 is formed along the inlet 2e of the bag 2. As shown in FIG. In the heat-sealed portion 3, the film 2a on one side of the bag 2 and the film 2b on the other side are welded together, thereby sealing the inlet 2e. The inside of the bag 2 is evacuated before heat sealing.

Along the side 2g on the opposite side of the inlet 2e, the tear band 4 extends from _one side 2c of the bag 2 to the other side 2d so as to extend in the D1 direction substantially parallel to the side 2g. is set. The cleavage zone 4 is formed by arranging a plurality of recesses ₅ in the D1 direction.

The bag 2 may be sealed with a sealing portion separate from the cleavable band 4 at the sides 2g, or may be sealed with a heat-sealing portion including the cleavable band 4. FIG. That is, a sealing portion for sealing the side 2g may be provided separately from the cleavable band 4, or the cleavable band 4 may be formed integrally with the heat-sealed portion for sealing the side 2g. However, in order to ensure the strength of the cleavable band and to reliably cut off the inside and outside of the bag, it is preferable to separately provide the heat-sealed portion for sealing and the cleavable band.

The bag 2 may be one in which the film 2a and the film 2b are continuously connected at the side 2g portion from the beginning, and the side 2g portion of the rectangular thermoplastic synthetic resin film is heat-sealed separately from the cleavable band 4. It is also possible to use a part formed and sealed.

Either the heat-sealed portion 3 or the cleavage band 4 may be formed first. When a length film is used, the order of forming the heat-sealed portion on the side 2g side, the heat-sealed portion 3 on the side of the inlet 2e, and the cleavable band 4 is arbitrary and may be any order. The object to be stored C may be stored at any stage before vacuum suction.

FIG. 8 shows an example of a bag 2 in which a portion along a side 2g is sealed with a heat-sealed portion integrally having a tear band 4. As shown in FIG. FIG. 9 shows an example of a bag 2 in which a portion along a side 2g is sealed with a heat-sealed portion 2h separate from the split band 4. As shown in FIG.

In the bag 2 of FIG. 9, as shown in (a), the heat-sealed portion 2h extends from the side 2c to the side 2d on the side 2g side of the split band 4. As shown in FIG. The heat-sealed portion 2h is not provided in the bag 2 of FIG. Instead, in FIG. 8, the films 2a and 2b are also welded together in the range of L2, which will be described later, and the inside of the bag ₂ and the side 2g side are airtightly separated by the tear band 4. FIG.

The concave portion 5 includes a central groove _- shaped portion 5a extending in the D2 direction obliquely crossing the D1 direction, a curved groove _- shaped portion 5b continuing to one end side of the central groove-shaped portion 5a, and a curved groove-shaped portion 5b continuing to the other end side. and a grooved portion 5c. _The oblique angle, that is, the intersection angle θ between the D1 direction and the D2 direction is preferably about ₅ to 30°, particularly about 7 to 13°.

The curved groove portion 5b curves from the central groove portion 5a toward the inlet 2e, and the curved groove portion 5c curves from the central groove portion 5a toward the side opposite to the inlet 2e. As a result, the concave portion 5 has a substantially S-shape (including an inverted S-shape).

The concave portion 5 is deepest near the center in the longitudinal direction, and gradually becomes shallower toward both ends in the longitudinal direction. In addition, as shown in the drawing, the concave portion 5 is provided so as to bite into the film 2b. In this embodiment, the recess 5 is recessed from the film 2a side and protrudes from the film 2b. The depth d ₁ of the deepest part of the recess 5 is preferably about 50 to 667%, especially about 150 to 500% of the thickness t ₁ of the film 2a. The linear distance L ₁ between both ends of the recess 5 is preferably 8 to 117 times, especially 25 to 44 times the thickness t ₁ of the film 2a. The films 2a and 2b are formed integrally and have the same thickness. _The thickness t1 of the films 2a and 2b is preferably about 30-300 μm, more preferably about 50-200 μm.

The shortest distance L ₂ between adjacent recesses 5 is preferably about 0.4 to 10 times the thickness t ₁ of the film 2a, particularly preferably about 1.1 to 6.7.

By welding (fusion) the films 2a and 2b also between the concave portions 5, the portion along the side 2g of the bag 2 is sealed by the heat seal portion having the tear band 4 as shown in FIG. be able to.

Even with the bag 2 shown in FIG. 9, which is sealed with a heat seal portion 2h separate from the cleavage band 4, the films 2a and 2b are welded between the concave portions 5 of the cleavage band ₄ (L2 portion). may be In this case, there is no problem even if air remains in the portion between the heat-sealed portion 2h and the cleavable band 4, but when the cleavable band 4 is formed, the inside of the bag 2 is evacuated and the air remains in this portion. preferably not.

This package 1 is unsealed by grasping the content C side of the cleavable band 4 with one hand, and grasping the side 2g side of the cleavable band 4 with the other hand and pulling. Since the cleavage band 4 is composed of an array of recesses 5 and the depth of the recesses 5 is uneven in the longitudinal direction, the tensile stress is locally concentrated in a part of the recesses 5, and the recesses 5 are formed from this part. initiate cleavage. When a portion of the concave portion 5 starts to split, the split spreads to the entire split band 4 and the package 1 is unsealed. This package 1 can be easily opened with a small force required for unsealing.

Cleavage band 4 consisting of an array of recesses 5 is formed by pressing heat wire 20 shown in FIG. Next, the cleavage band forming apparatus 10 having a heat wire 20 for forming the cleavage band 4 will be described.

The cleavage band forming apparatus 10 has a body portion 11, a receiving portion (base) 12 projecting forward from the body portion 11, a lever portion (movable body) 13 disposed above the receiving portion 12, and the like. is doing. The lever portion 13 is rotatably supported around a support shaft (not shown) provided in the body portion 11, and is vertically rotatable by a driving device (not shown). The receiving portion 12 and the lever portion 13 can be in contact with each other uniformly over a width of 10 to 20 mm. The heat wire 20 may be provided on the lever portion 13 .

As shown in FIG. 7, the heat wire 20 has a straight main wire 21 and a sub wire 22 spirally wound around the main wire 21 . The main wire 21 and the sub wire 22 are made of resistance heating elements such as nichrome wires. The wire diameter of the main wire 21 is preferably 0.3 to 0.5 mm, particularly 0.32 to 0.45 mm. The wire diameter of the secondary wire 22 is preferably about 0.2 to 0.5 mm.

After inserting the side 2g side of the bag 2 between the receiving portion 12 and the lever portion 13 and arranging the formation scheduled region of the cleavage band 4 on the heat wire 20, the heat wire 20 is energized and heated to about 130 to 160°C. Heat is generated and the lever part 13 is pushed down. As a result, the sub-wires 22 of the heat wires 20 bite into the film 2a to form the recesses 5 and the split band 4. As shown in FIG. Also, at this time, the films 2a and 2b may be welded to each other by the heat of the heat wire 20 at the cleavage zone 4 and its peripheral edge. In this case, the _ratio T/t1 between the width T of the welded portion between the films 2a and 2b and the film thickness t1 at the periphery of the recess ₅ should be 0.3 to 10, especially 0.5 to 5.8. is preferred. This tear strip forming apparatus 10 can be used to manufacture the packages of any aspect of the present invention.

FIG. 10 is a front view of a package 1' according to another embodiment, in which an object C is vacuum-sealed in a bag 2 made of a thermoplastic synthetic resin film. As the thermoplastic synthetic resin film, those described above can be used.

A heat-sealed portion 3 is formed along the inlet 2e of the bag 2. As shown in FIG. In the heat-sealed portion 3, the film 2a on one side of the bag 2 and the film 2b on the other side are welded together, thereby sealing the inlet 2e. The inside of the bag 2 is evacuated before heat sealing.

Cleavage band 4 extends from one side 2c of bag 2 to the other side 2d so as to extend in direction D1 substantially parallel to heat-sealed portion ₃ , toward object C side of heat-sealed portion 3. is deferred. The configuration of the cleavage zone 4 is the same as above.

The package 1' is manufactured, for example, by storing a content C in a bag 2 whose sides 2g are sealed, and forming a tear strip 4 and a heat-sealed portion 3 on the side of an entrance 2e. The inside of the bag 2 is vacuum-sucked before heat-sealing. Either the cleavage band 4 or the heat seal portion 3 may be formed first.

In this package 1' as well, instead of using the bag 2 in which the film 2a and the film 2b are continuously connected at the side 2g portion from the beginning, after the object C is put in the thermoplastic synthetic resin film of the length. It is also possible to manufacture the package 1' through the process of forming a heat-sealed portion on the side 2g and sealing.

When the package 1' is manufactured using a film having a rectangular shape, the order of forming the heat-sealed portion on the side 2g side, the heat-sealed portion 3 on the side of the entrance 2e, and the split band 4 is arbitrary.

The storage of the object to be stored C may be performed at any stage as long as it is before vacuum suction. For example, the object to be accommodated may be placed in the cylinder from the beginning, or the object to be accommodated may be placed after partially heat-sealing or forming a cleavable band.

In the present invention, the tear band 4 does not have to be continuous from one side to the other, regardless of whether the package uses a bag-like film or a cylindrical film. For example, the cleavage band may be provided halfway from one side to the other side. Also, the cleavage band may be provided from one side toward the entrance 2e or the side 2g. In this case, the cleavage zone may or may not reach the entrance 2e or the side 2g.

The package provided with the cleavable band of the present invention is suitable for storing an object to be unsealed and used in a highly clean environment. The cleanliness of the high-cleanliness environment is preferably higher than ISO7 class (class 10,000), more preferably higher than ISO6 class (class 1,000). Such environments include clean rooms and clean benches.

The above description is an example of the present invention, and the present invention may be configured in a manner other than the above. For example, as the heat wire, a wire obtained by twisting two strands (linear resistance heating elements) may be used.

A cleavable band 4 was formed on a 25×25 cm bag made of a polyethylene film having a thickness of 80 μm using the cleavable band forming apparatus shown in FIG. As the main wire 21 of the heat wire 20, an iron-chromium heating wire (FCHW2) having a length of 300 mm and a wire diameter of 0.20, 0.32, 0.40, or 0.45 was used. As the secondary wire 22, an iron-chromium heating wire (FCHW2) with a wire diameter of 0.20, 0.32, 0.40 or 0.45 mm was used. The secondary wire 22 was helically wound around the main wire 21 with a length of 300 mm at 40 to 47 turns. The applied current value at the time of formation of the cleavage band was 10.5 A, the maximum exothermic temperature was 250° C., the pressing pressure was 0.4 MPa, and the heating time was 2.5 sec.

Each bag 2 having a tear band 4 formed thereon was evaluated for "ear tearing" and "opening" properties. "Ear tear" indicates the ease with which the film sheet initially tears along the tear zone. "Open" refers to the degree of separation of the welded film sheets after being torn off. Table 1 shows the results. Table 1 shows the measurement results of the maximum tearing load and median tearing load.

In the evaluation in Table 1, the evaluation for both "ear tearing off" and "opening" should be 4 or more for practical use, and 5 or more is more desirable.

From Table 1, the thickness of the main line is desirably 0.32 to 0.45 mm. If the thickness is more than 0.45 mm, the welded area increases, making it difficult to tear off the edges and to open the package. If the thickness is thinner than 0.32 mm, the pattern of the cleavage band changes, and although it is difficult to tear off the edge, the welded area is small when the edge is torn off, so that the opening property is improved.

Reference Signs List 1, 1' package 2 bag 2h, 3 heat seal portion 4 cleavable band 5 recessed portion 10 cleavable band forming device 20 heat wire

Claims (15)

A bag made of a thermoplastic synthetic resin film having an inlet,
At least a portion of the side opposite to the inlet is provided with a cleavage zone,
The cleavage zone consists of a plurality of recesses arranged in the extending direction of the cleavage zone,
At least a portion of each recess is a groove extending in an oblique direction with respect to the extending direction of the cleavage band,
that the depth of the recess varies in the longitudinal direction of the recess; ,as well as
The film on one side of the bag and the film on the other side are welded together in the concave portion and its peripheral portion,
_The ratio T/t1 between the width T of the welded portion of the peripheral edge and the thickness t1 of the film is 0.3 to ₁₀ . A bag characterized by 2. The bag according to claim 1, wherein said concave portion is deepest at a middle portion in the longitudinal direction of said concave portion, and gradually becomes shallower from said middle portion toward both end sides of said concave portion. 3. The bag according to claim 2, wherein the percentage d ₁ /t ₁ ×100 (%) of the depth d ₁ of the deepest portion of the recess to the thickness t ₁ of the film is 50 to 667%. The bag according to any one of claims 1 to 3, wherein an intersection angle θ between the extending direction D ₁ of the cleavage band and the extending direction D ₂ of the groove is 5 to 30°. 5. A method according to any one of claims 1 to 4, wherein a ratio L ₁ /t ₁ of the linear distance L ₁ from one end to the other end in the longitudinal direction of the recess and the thickness t ₁ of the film is 8 to 117. A bag characterized by: 6. The bag according to any one of claims 1 to 5, wherein said recess extends in an S shape. 7. The bag according to any one of claims 1 to 6 , wherein a side of the bag opposite to the inlet is sealed with a sealing portion, and the sealing portion is provided separately from the cleavable band. A bag to be. In a package in which an object is contained in a bag made of a thermoplastic synthetic resin film,
At least a portion of the bag is provided with a rupture band,
The cleavage zone consists of a plurality of recesses arranged in the extending direction of the cleavage zone,
At least a portion of each recess is a groove extending in an oblique direction with respect to the extending direction of the cleavage band,
that the depth of the recess varies in the longitudinal direction of the recess; ,as well as
The film on one side of the bag and the film on the other side are welded to each other in the recess and its peripheral edge,
_The ratio T/t1 between the width T of the welded portion of the peripheral edge and the thickness t1 of the film is 0.3 to ₁₀ . A package characterized by A package in which an object to be contained is sealed in the bag according to any one of claims 1 to 7 . a base and a movable body capable of moving toward and away from the base for sandwiching the thermoplastic synthetic resin film;
A cleavage band forming device provided on at least one of the base and the movable body and having a heat wire pressed against the film,
The cleavage zone is characterized in that the heat wire is composed of a linearly extending main wire and a sub wire spirally wound around the main wire, or a plurality of strands are twisted together. forming device. 11. The cleavage band forming device according to claim 10 , wherein the main wire has a wire diameter of 0.3 to 0.5 mm and the secondary wire has a wire diameter of 0.2 to 0.5 mm. A housing step of housing an object to be contained in the bag according to any one of claims 1 to 6 ;
A method for manufacturing a package, comprising a sealing step of forming a heat-sealed portion at the entrance of the bag with a heat-sealing device to seal the bag. 13. The method of manufacturing a package according to claim 12 , wherein after said accommodating step, the inside of the bag is evacuated, and then a sealing step is performed. In a method for manufacturing a package in which an object is enclosed in a synthetic resin bag and a tear strip for opening is formed,
A housing step of housing the object in a cylindrical synthetic resin film having one end and the other end;
a first sealing step of sealing the one end of the cylindrical synthetic resin film by forming a first heat sealing portion with a heat sealing device;
an exhaust step of exhausting the inside of the cylindrical synthetic resin film;
a second sealing step of sealing the other end of the cylindrical synthetic resin film by forming a second heat-sealing portion with a heat-sealing device;
One of the first and second heat-sealed portions (hereinafter referred to as heat-sealed portion A) or closer to the object side than the heat-sealed portion A before the heat-sealed portion A is formed , a cleavage zone forming step of forming the cleavage zone during or after formation;
has
The cleavage zone consists of a plurality of recesses arranged in the extending direction of the cleavage zone,
At least a portion of each recess is a groove extending in an oblique direction with respect to the extending direction of the cleavage band,
The depth of the recess varies in the longitudinal direction of the recess,
The film on one side of the bag and the film on the other side are welded together in the concave portion and its peripheral portion,
A ratio T/t ₁ of the width T of the welded portion of the peripheral portion to the thickness t ₁ of the film is 0.3 to 10,
A method of manufacturing a package, wherein the step of containing the object to be contained is performed before the step of discharging and before or after forming the first heat-sealed portion. The package according to claim 8 or 9 is opened by applying a tensile force to the cleavage band in an environment higher in cleanliness than ISO 7 class according to ISO standard 14644-1 (JIS compliant). A method of opening a package, characterized by:

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