TW201716303A - Core plug, film roll, packaged article, and method for removing core plug - Google Patents

Abstract

Provided are: a core plug used as a plug intended to be attached to a cylindrical core on which a film is wound, it being possible for the core plug to prevent foreign matter and airborne moisture contributing to condensation from infiltrating the core; a film roll and packaged article provided with the core plug; and a method for removing the core plug. This core plug is intended to be attached to a cylindrical core on which a film is wound, wherein the core plug is a flexible disc-shaped body that is inserted into and fitted in the axial-direction ends of the core in a reduced-diameter state. This film roll is provided with a cylindrical core, a film wound on the core, and the core plug, which has been inserted into and fitted in the axial-direction ends of the core in a reduced-diameter state. This packaged article is provided with the film roll, and a packaging material for packaging the film roll.

Description

Core plug, film roll, package and core plug removal method

The present invention relates to a core plug, a film roll, a package, and a core plug removal method.

In general, a film is wound around a cylindrical core to form a film roll, and is stored and transported in a state of being packaged with a packaging material. However, in general, both ends of the core are in an open state, and thus foreign matter such as condensation or dust is generated in the core. Such moisture or foreign matter is released from the inside of the core due to vibration or the like when the film roll is conveyed, and comes into contact with the end surface of the film or the like, which causes deterioration of the quality of the film. For example, a polyvinyl alcohol (PVA) film which is a material film of a polarizing film has high hygroscopicity and wrinkles or slacks due to contact with moisture. Such a defect exhibits unevenness in polarization characteristics of the polarizing film and the like. Further, foreign matter such as dust adhering to the surface of the PVA film may become a factor of optical defects of the obtained polarizing film.

Therefore, the following method is proposed: when the film roll is wrapped with a packaging material, the remaining packaging material is inserted into the inside of the core, etc., thereby preventing condensation generated in the core from coming into contact with the film (refer to Japanese Patent Laid-Open No. 2013-227073) Bulletin). Moreover, if the remaining packaging material is squeezed into the inside of the core in this way, the opening portion of the core end portion is also narrowed due to This also suppresses the entry of dust or the like from the core end portion to some extent. In addition, a cover for film packaging which is inserted into the core to prevent dust or the like from entering the core of the film roll has been proposed (refer to Japanese Laid-Open Patent Publication No. 2000-142616).

However, in recent years, since the quality of the film roll has been increasing, the dew condensation is more likely to occur due to an increase in the heat capacity of the film roll and a subsequent decrease in the temperature change rate of the entire film roll. In addition to this, as the quality of the film roll increases, a metal core or a carbon fiber reinforced plastic core is used. A metal core or a plastic core is more likely to cause condensation than a paper core or the like. Therefore, the above method of pressing the remainder of the packaging material into the core does not sufficiently suppress the occurrence of dew condensation, and when the packaging material is removed to use the film roll, the condensation remaining in the core leaks and adheres to the end face of the film roll, etc. . Further, since the core end portion is open, foreign matter also intrudes into the core, causing adhesion to the film roll end face or the like when the packaging material is removed. On the other hand, the cover for film packaging described above does not consider the sealing property, and the occurrence of condensation in the core cannot be sufficiently suppressed.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Laid-Open Patent Publication No. 2013-227073

[Patent Document 2] Japanese Patent Laid-Open Publication No. 2000-142616

The present invention is based on the invention completed above, the purpose of which Provided is a core plug, a film roll and package having the same, and a plugging method for the core plug, which is used as a plug for a cylindrical core attached to a wound film, It inhibits moisture and foreign matter in the air that is a factor of condensation from entering the core.

In order to solve the above problems, the invention provides a core plug for a cylindrical core that is attached to a wound film, and the plug-like disk-shaped elastic body is inserted into the core in a reduced diameter state. The end in the axial direction.

The core is a plug-shaped disk-shaped elastic body, and the core plug having an outer diameter larger than the inner diameter of the core can be inserted and inserted into the core end portion. At this time, the core is inserted into the core in a state in which the plug is reduced in diameter, and is fixed in the core by a repulsive force. Therefore, the core system in which the core plug is inserted is highly sealed, and the core plug can prevent moisture and foreign matter in the air from entering the core during storage or transportation of the film roll.

The hardness of the core plug is preferably 30 N or more and 3,000 N or less. When the core plug having such a hardness is used, the sealing property and workability of the core can be further improved.

The main component of the core plug is preferably a polyurethane, an anthrone resin, a natural rubber, a synthetic rubber or a combination thereof. By using these materials as a main component, a core plug having a good hardness can be obtained.

The ratio (T/D1) of the thickness (T) to the diameter (D1) of the core plug is preferably 0.05 or more and 0.3 or less. When the core plug is inserted into the core, it is difficult to remove the plug for the core due to its high fixing property. On the other hand, when the thickness ratio (T/D1) of the core plug is set to the above range, the outer side of the inserted plug is pressed. The portion other than the center of the surface can easily rotate the core plug in the core with the diameter direction as the rotation axis. In this way, the core is rotated in the core, and since the core plug can be grasped by hand, it can be easily removed.

The plug for the core preferably has one or a plurality of recesses formed on at least one side. By having such a concave portion, the grip property is high, and the workability at the time of attaching or detaching the plug for the core can be improved.

Another invention to solve the above problems is a film roll comprising: a cylindrical core, a film wound around the core, and an end portion of the core in the axial direction in a reduced diameter state. The above core is plugged.

In the film roll, the elastic core is inserted into the core in a state where the diameter is reduced, and is fixed in the core by a repulsive force. Therefore, the film roll core has high airtightness, and it is possible to suppress moisture and foreign matter in the air from entering the core during storage or transportation of the film roll.

The outer side surface of the core plug is preferably on the same plane as the end surface of the core or on the inner side of the end surface of the core. In this manner, the core is fixed in a state of being pressed into the core, and the fixing property of the core plug or the like can be improved.

The ratio (D1/D2) of the diameter (D1) in the non-reduced diameter state of the core plug to the inner diameter (D2) of the end portion of the core is preferably 1.005 or more and 1.05 or less. By setting the ratio of the diameter (D1) of the core plug which is not inserted into the core to the inner diameter (D2) of the end of the core into which the core plug is inserted, it is possible to achieve both Good sealing and workability in the core.

The above film is preferably a polyvinyl alcohol (PVA) film. Since the PVA film requires high quality management, the effect of the present invention can be more significantly exerted by applying the present invention to a film roll of a PVA film.

Another invention completed to solve the above problems is a package comprising the above-described film roll and a packaging material for packaging the film roll. Since the packaging system packs the film roll, the sealing property in the core is excellent, and it is possible to suppress the intrusion of moisture or foreign matter in the air which is a cause of dew condensation.

Another method for solving the above problems is a method for removing a core plug, which is a method for removing the core plug in the film roll, comprising the steps of: pressing an outer surface of the core plug The core plug is rotated by a diameter other than the center of the center.

With this unloading method, it is possible to operate in such a manner that the embedded core is rotated in the core with a plug, thereby easily removing the plug for the core.

Here, "hardness" means a value measured according to the D method of JIS-K-6400-2 (2012). The "main component" means a component having the highest content rate, and for example, a component having a content of 50% by mass or more.

According to the present invention, it is possible to provide a core plug, a film roll and a package including the same, and a method for removing the core plug, which can suppress condensation as a film roll during storage or transportation Factors in the air, moisture and foreign matter invade the core.

10‧‧‧ core plug

11‧‧‧ recess

12‧‧‧Outside

13‧‧‧Parts outside the centre

20‧‧‧ Film Roller

21‧‧ ‧ core

22‧‧‧ Film

23‧‧‧End of the core

End face of 24‧‧ ‧ core

Fig. 1 is a perspective view of a plug for a core according to an embodiment of the present invention.

Fig. 2 is a cross-sectional view showing a part of a film roll provided with a plug for a core of Fig. 1.

Fig. 3 (a) and Fig. 3 (b) are explanatory views of a method of removing the core plug in the film roll of Fig. 2;

[Formation of the Invention]

Hereinafter, the method for removing the core plug, the film roll, the package, and the core plug according to the embodiment of the present invention will be described in detail with reference to the drawings which are appropriately referred to.

<core plug>

The core plug 10 of Fig. 1 is a plug for a core used for storage or transportation of a film roll. The shape of the core plug 10 is a disk shape, that is, a flat cylindrical shape. Further, the core plug 10 is an elastic body that is compressed by applying a force. Such a core plug 10 is a cover that is inserted into an end portion of the cylindrical core in which the long film is wound in the axial direction in a reduced diameter state. The outer peripheral surface of the core plug 10 does not have irregularities, and the outer peripheral surface can be in close contact with the inner surface of the core.

The size of the core plug 10 is set according to the inner diameter of the end of the core to be mounted. The diameter (D1) of the core plug 10 is slightly larger than the inner diameter (D2) of the end portion of the core in the axial direction of the mounted core. The diameter (D1) of the core plug 10 is slightly larger than the inner diameter (D2) of the end portion of the core, and can be inserted into the end portion of the core and fixed in a state where the diameter is reduced.

The lower limit of the diameter (D1) of the core plug 10 is preferably 50 mm, more preferably 100 mm, and still more preferably 150 mm. On the other hand, as The upper limit of the diameter (D1) is preferably 600 mm, more preferably 400 mm, and still more preferably 300 mm.

The thickness (T) of the core plug 10 is not particularly limited, and is preferably 5 mm, more preferably 10 mm, as the lower limit. On the other hand, as the upper limit thereof, it is preferably 60 mm, more preferably 40 mm. When the thickness (T) is equal to or higher than the above lower limit, the strength is high, and the core plug 10 is more reliably fixed in the core, and the airtightness is further improved. On the contrary, when the thickness (T) is less than or equal to the above upper limit, the workability at the time of embedding and unloading is further improved. In particular, as will be described later, when the core plug 10 is rotated in the core to be removed, the rotation of the core plug 10 in the core is facilitated.

The lower limit of the ratio (T/D1) of the thickness (T) to the diameter (D1) of the core plug 10 is preferably 0.05, more preferably 0.1. On the other hand, as the upper limit of the ratio (T/D1), it is preferably 0.3, more preferably 0.2. When the thickness ratio (T/D1) is equal to or higher than the above lower limit, the relative thickness is increased and the strength is increased, and the core plug 10 is more reliably fixed in the core, and the airtightness is further improved. On the other hand, when the thickness ratio (T/D1) is less than or equal to the above upper limit, the workability at the time of insertion and removal is further improved, and when the core is rotated in the core to remove the core plug 10, the core is removed. The rotation of the plug 10 within the core becomes easy.

The lower limit of the hardness of the core plug 10 is preferably 30 N, more preferably 60 N, still more preferably 150 N. On the other hand, as the upper limit thereof, it is preferably 3,000 N, more preferably 1,500 N, still more preferably 800 N. When the hardness is within the above range, the handleability of the core plug 10, the sealing property of the core, and the like can be further improved. In particular, when the hardness is at least the above lower limit, the core plug 10 can be reduced due to vibration or the like during transport of the film roll. The generation of the gap due to the offset or deformation of the fixed position or the like makes it possible to more effectively prevent the occurrence of dew condensation in the core by the entry of the outside air. On the other hand, when the hardness is equal to or less than the above upper limit, the core plug 10 is easily reduced in diameter during the insertion, so that the insertion and the insertion are easy, and the removal is also easy.

The core plug 10 is preferably constructed of a single material. In the case where the core plug 10 is composed of a plurality of materials (members), the hardness of the material (member) which forms at least the peripheral surface and accounts for 50% or more by mass is preferably within the above range, more preferably all The hardness of the material (member) is within the above range.

The core plug 10 is not particularly limited as long as it is an elastomer, and is usually formed of an elastomer or rubber. As a main component of the core plug 10, a polyurethane, an anthrone resin, a natural rubber, a synthetic rubber or a combination thereof is preferable. Polyurethane refers to a polymer having a urethane bond, and is usually obtained by polymerization of a compound having an isocyanate group and a compound having a hydroxyl group. An anthrone resin refers to a polymer having a decane bond in the main chain. Examples of the synthetic rubber include isoprene rubber, butadiene rubber, styrene-butadiene rubber, chloroprene rubber, nitrile rubber, ethylene-propylene rubber, acrylic rubber, and fluororubber. It is an ethylene-propylene rubber. These can be used alone or in combination of two or more. Among them, from the viewpoint of having a moderate hardness, etc., it is more preferably a polyurethane.

As the content ratio of the polyurethane, the fluorenone resin, the natural rubber, the synthetic rubber, or a combination thereof in the core plug 10 The limit is preferably 50% by mass, more preferably 80% by mass, still more preferably 95% by mass. On the other hand, the upper limit may be 100% by mass or 99% by mass. Examples of the component which the core plug 10 can contain in addition to these main components include other resin components, colorants, antioxidants, fillers, and the like.

The core plug 10 may be a porous body such as a foam, or may be a non-porous one, and may be any one, but it is possible to obtain a core plug 10 having a good hardness and a light weight. Good for foam. As a preferable foam, a resin foam, such as an urethane foam, is mentioned.

The core plug 10 has four recesses 11 formed on one side. The four recesses 11 are formed at the vertex positions of the square in the central portion of a circular surface of the core plug 10. These recesses 11 are provided as holes for snapping fingers at the time of gripping. By having such a concave portion 11, the grip property is high, and the workability at the time of attaching or detaching the core plug 10 can be improved.

These recesses 11 are formed to a size that can be inserted into the finger to hold the core plug 10. The recess 11 is formed in a cylindrical shape. The diameter of the concave portion 11 is, for example, about 10 mm or more and 30 mm or less. The depth of the concave portion 11 is, for example, about 10 mm or more and 30 mm or less. Further, the depth of the concave portion 11 is preferably 2/3 or less of the thickness (T) of the core plug 10 from the viewpoint of maintaining strength and the like.

<film roll>

The film roll 20 of FIG. 2 includes a cylindrical core 21, a film 22 wound around the core 21, and a core plug 10 that is inserted into the axial end portion 23 of the core 21 in a reduced diameter state. .

In the film roll 20, the elastic core plug 10 is inserted into the core 21 in a state of being reduced in diameter, and is fixed in the core 21 by a repulsive force. Therefore, the film roll 20 has high airtightness in the core 21, and it is possible to prevent moisture and foreign matter in the air from entering the core 21 during the storage or transportation of the film roll.

The core 21 is a substantially cylindrical body having rigidity. The core 21 can be exemplified by metal, synthetic resin, paper, wood, and the like. Further, it may be a composite material of metal and synthetic resin, a composite material of metal and paper, a composite material of synthetic resin and paper, or the like. The core 21 is strong in strength and can exhibit the effects of the present invention more remarkably, and it is preferable to use a metal, a synthetic resin, or a combination thereof as a main component. In addition, it is difficult to be affected by wear and the like even if it is repeatedly used, and it is more preferable to use metal as a main component. The lower limit of the content of the metal and the synthetic resin in the core 21 is preferably 50% by mass, more preferably 80% by mass, still more preferably 95% by mass, and particularly preferably 99.9% by mass.

Examples of the metal include iron, stainless steel, aluminum, and the like, and iron and aluminum are preferable from the viewpoints of strength, lightness, and the like. They can be used alone or in combination of two or more.

Examples of the synthetic resin include polyvinyl chloride, polyvinylidene chloride, polyester, polycarbonate, polyamine, epoxy resin, polyurethane, polyurea, and fluorenone resin. It is preferably polyvinyl chloride. Further, from the viewpoint of strength and the like, fiber-reinforced plastic (FRP) such as carbon fiber reinforced plastic is also preferable. They can be used alone or in combination of two or more.

In the film roll 20, even when the inner surface of the core 21 is formed of a material which is likely to cause dew condensation such as metal or synthetic resin, Since the moisture in the air which is a cause of dew condensation hardly penetrates into the core 21, the effect of the present invention can be more significantly exhibited when such a core 21 is used. Therefore, the lower limit of the area ratio of the metal, the plastic or a combination thereof exposed in the inner surface of the core 21 is preferably 50%, more preferably 80%, still more preferably 100%.

The outer diameter and the inner diameter of the core 21 are not particularly limited. For example, the inner diameter (D2) of the end portion 23 of the core 21 can be set to about 50 mm or more and 600 mm or less. The axial length of the core 21 can be appropriately set depending on the width of the film 22 to be wound. The axial direction length of the core 21 can be, for example, 2 m or more and 10 m or less.

The film 22 wound around the core 21 is not particularly limited, and examples thereof include a polyvinyl alcohol (PVA) film, a cellulose triacetate (TAC) film, a polyester film, a polyamide film, a norbornene resin film, and the like. Resin film. Among them, in the case of an optical film such as a PVA film or a TAC film, particularly a PVA film, the effects of the present invention can be more significantly exhibited. This is because the PVA film is required to have high quality as a material for producing a polarizing film or the like, and is greatly affected by water or foreign matter.

The PVA forming the PVA film can be obtained by using a polyvinyl ester obtained by polymerizing a vinyl ester such as vinyl acetate by saponification. In addition to PVA, the PVA film may contain additives such as a plasticizer, a surfactant, and a colorant as needed.

The width of the film 22 is not particularly limited, and is preferably 2 m, more preferably 2.1 m, still more preferably 3 m, and particularly preferably 3.3 m. In the case where the width of the film 22 is wide, the core 21 also becomes long, and the inner area of the core 21 becomes large. Thus, in this case, the condensation in the core 21 is generally changed. It is easy to occur, and thus it becomes possible to exert the effects of the present invention more significantly. On the other hand, the upper limit of the width of the film 22 is preferably 10 m, more preferably 8 m. When the width of the film 22 is equal to or less than the above upper limit, the operability and the like are improved.

The length of the film 22 is not particularly limited, and is preferably 1,000 m, more preferably 2,000 m, still more preferably 5,000 m, and particularly preferably 8,000 m. When the length is equal to or higher than the above lower limit, it is possible to suppress an increase in the ratio of the loss generated in the portion where the winding is started or the end of the winding, and the workability is also improved. Further, in general, the longer the length of the film 22 is, the larger the heat capacity is, and the condensation in the core 21 is likely to occur, so that the effects of the present invention can be more significantly exhibited. On the other hand, the upper limit of the length of the film 22 is, for example, preferably 20,000 m, more preferably 15,000 m, still more preferably 10,000 m. When the length is equal to or less than the above upper limit, it is possible to suppress the mass or diameter of the film roll 20 from becoming excessively large, and to improve the operability when attaching and detaching or moving toward the gantry or the processing apparatus.

The average thickness of the film 22 is also determined depending on the material, use, and the like, and can be, for example, 5 μm or more and 500 μm or less. The thickness of the entire layer of the film 22 in a state in which the film 22 is wound can be, for example, 50 mm or more and 1,000 mm or less.

The film 22 can be obtained by a known method such as a casting film forming method, a wet film forming method, a dry film forming method, a gel film forming method, or a melt extrusion film forming method.

The core plug 10 is fitted to both ends of the core 21 in a state of being compressed in the radial direction. The core plug 10 is the same as the core plug 10 of the first embodiment, and therefore the same reference numerals are given to the same components, and detailed description thereof will be omitted. Core plug 10 The diameter in the non-reduced diameter state (D1: see Fig. 1) is slightly larger than the inner diameter (D2) of the end portion 23 of the core 21 into which the core plug 10 is inserted. Therefore, the core plug 10 is inserted into the end portion 23 of the core 21 in a state where the diameter is reduced, and can be fixed in the core 21 by the repulsive force.

The lower limit of the ratio (D1/D2) of the diameter (D1) in the non-reduced diameter state of the core plug 10 to the inner diameter (D2) of the end portion 23 of the core 21 is preferably 1.005, more preferably 1.009. On the other hand, as the upper limit of the ratio (D1/D2), it is preferably 1.05, more preferably 1.03. When the ratio (D1/D2) is within the above range, good sealing properties and workability can be achieved. In particular, when the ratio (D1/D2) is equal to or higher than the above lower limit, when the core plug 10 is inserted into the core 21, the core plug 10 is sufficiently reduced in diameter, and the fixing of the core plug 10 becomes more reliable. In this case, it is possible to reduce the occurrence of a gap caused by the vibration of the film roll 20 during the conveyance of the film roll 20, the offset of the fixed position, the deformation, and the like, and it is possible to use the entry of the outside air. Effectively prevents condensation from occurring in the core. On the other hand, when the ratio (D1/D2) is equal to or less than the above upper limit, the insertion of the core plug 10 toward the end portion 23 of the core 21 is facilitated, and the removal is also facilitated.

The outer side surface 12 of the core plug 10 in the state in which the plug 10 is inserted is preferably on the same plane as the end surface 24 of the end portion 23 of the core 21 or on the inner side of the end surface 24 of the core 21. The outer side surface 12 is a bottom surface on the side exposed when the core plug 10 is inserted into the core 21. In this manner, the core plug 10 is fixed in a state of being pressed in the core 21, whereby the fixing property of the core plug 10 and the like can be improved. In the case where the outer side surface 12 of the core plug 10 is located outside the end surface 24 of the end portion 23 of the core 21, when the film roll 20 is conveyed, etc., the core plug 10 or the like is contacted by the obstacle, and the core plug is used. 10 shedding Damaged.

On the other hand, when the core plug 10 is excessively pressed into the core 21, the occurrence of condensation on the outer portion of the core plug 10 in the core 21 or adhesion of foreign matter or the like easily occurs. Further, the removal of the core plug 10 becomes difficult. Therefore, when the outer side surface 12 of the core plug 10 is further inside than the end surface 23 of the core 21, the distance between the outer side surface 12 of the core plug 10 and the end surface 24 of the core 21 is preferably 100 mm or less. More preferably, it is 50 mm or less, and even more preferably 20 mm or less.

The lower limit of the mass of the film roll 20 is preferably 500 kg, more preferably 1,500 kg, still more preferably 2,500 kg. In the present invention, the mass is large and the heat capacity is increased. As a result, even when condensation is likely to occur, the core plug 10 can suppress the occurrence of dew condensation. Therefore, in the film roll 20 having the above-described lower limit or higher quality, the effects of the present invention can be exhibited more remarkably. In addition, the upper limit of the mass of the film roll 20 can be set to 5,000 kg from the viewpoint of workability and the like.

When the film roll 20 is used, the core plug 10 can suppress the intrusion of moisture into the core 21 in the air. Therefore, the quality of the film 22 can be maintained even in an environment where condensation is likely to occur. Specifically, the occurrence of dew condensation can be suppressed even in the case of transportation by an airplane or a ship whose temperature changes drastically, or after storage in a warehouse exposed to a low temperature. In addition, since it is possible to prevent foreign matter from entering the core 21, the core 21 can be kept in a clean state even in a storage environment such as dust or pests, and leakage from the foreign matter in the core 21 can be avoided. The resulting contamination of the film 22. In addition, the core plug 10 can be reused for the same core, or a core of the same size.

<package>

A package according to an embodiment of the present invention includes a film roll 20 of Fig. 2 and a packaging material for packaging the film roll 20. Since the film roll 20 is packaged in the packaging system, the sealing property in the core 21 is excellent, and it is possible to suppress the intrusion of moisture or foreign matter in the air which is a cause of dew condensation.

The packaging material is not particularly limited, and is usually a film (sheet), and may be a single layer film or a laminated film.

Examples of the single layer film include a polypropylene film, a polyethylene film, and the like.

Examples of the laminated film include a laminated film of a plurality of resin layers, a laminated film of a resin layer and a deposited layer, a laminated film of a resin layer and a metal foil, and the like, and specifically, aluminum is vapor-deposited in a pair. Laminated film of ethylene phthalate; laminated film of polyester, aluminum foil and polyethylene; laminated film of polyester and polyethylene of vapor-deposited aluminum; laminated film of polyester and polyethylene of vapor-deposited alumina; A laminated film of polyester and polyethylene of glass; a laminated film of polypropylene and polyethylene coated with polyvinylidene chloride. The packaging material can be used alone or in combination of two or more.

When two or more types of packaging materials are used in combination, the film roll 20 can be double-packed with two kinds of packaging materials. In this case, as the outer packaging material which is not in contact with the film roll 20, it is preferable to use a high-density polyethylene film, for example, which is excellent in mechanical strength. On the other hand, as the inner packaging material that is in contact with the film roll 20, a packaging material excellent in moisture resistance is preferably used. As such a packaging material, a laminated film in which aluminum is vapor-deposited on polyethylene terephthalate; a laminated film of polyester, aluminum foil, and polyethylene; an aluminum-deposited polyester and polyethylene A laminated film of a olefin; a laminated film of a polyester and a polyethylene which is vapor-deposited; a laminated film of a polyester film of a vapor-deposited glass and a laminated film of polyethylene, and the like.

The packaging method for packaging the film roll 20 with a packaging material is not particularly limited, and (1) the sheet-shaped packaging material is wound along the outer circumference of the film roll 20, and then the film is placed on the axis of the film roll 20. The two ends of the packaging material that are out of direction are screwed up, and the packaged material to be screwed is fixed to the outer peripheral surface of the end portion 23 of the core 21; (2) the film cylinder 20 is inserted into the package processed into a cylindrical shape. After the material, the both ends of the packaging material which are beyond the axial direction of the film roll 20 are screwed, and the screwed packaging material is fixed to the outer peripheral surface of the end portion 23 of the core 21.

Further, in the package, the packaging material which is screwed at both end portions of the drum can be fixed to the outer peripheral surface of the end portion of the core, and the remaining packaging material can be inserted into the inner side of the core. In this case, after the packaging material is inserted into the core, the core is inserted into the core with a plug, so that the end portion of the packaging material can be fixed. Further, it is also possible to package the film roll in a state in which the core plug is inserted into the core by using a packaging material. In either case, the core plug can be used to make the core sufficiently sealed.

As a method of fixing the screwed packaging material to the outer peripheral surface of the end portion 23 of the core 21, a method of using a fastening member, a method using a double-sided tape or an adhesive, and a method of thermally melting the packaging material may be mentioned. Method, etc. Examples of the fastening member include an adhesive tape, a band, a stretchable tape, and the like.

Further, in order to protect the film 22, the package preferably includes a gasket. Specifically, a pad may be disposed at the end of the film roll 20 The loop is further packaged by using a packaging material, and after the film roll 20 is packaged with the packaging material, a gasket is disposed at the end of the film roll 20 in the packaged state. As the gasket disposed before packaging, a polystyrene gasket, a urethane gasket, or the like can be used. As the gasket disposed after packaging, a wooden gasket, a corrugated cardboard gasket, or the like can be used.

The lower limit of the storage temperature at the time of storing the package is preferably -20 ° C, more preferably -10 ° C, still more preferably -5 ° C. On the other hand, as the upper limit thereof, it is preferably 50 ° C, more preferably 40 ° C, still more preferably 30 ° C. Moreover, since the package 21 has high airtightness, the package 21 can be prevented from being stored even after being stored at a low temperature of 10 ° C or lower (or even 5 ° C or lower, particularly 0 ° C or lower). The occurrence of condensation that is likely to occur when transporting to other places. Thereby, the effect of the present invention can be exhibited more remarkably when stored at such a low temperature.

The humidity at the time of storing the package is preferably 80% RH or less, more preferably 50% RH or less. The storage period of the package is not particularly limited, and the lower limit thereof is preferably 8 hours, more preferably 10 hours. On the other hand, as the upper limit, it is preferably 1 year, more preferably 6 months.

<Removal method of core plug>

The method for removing the core plug 10 in the film roll 20 includes the step of rotating the core plug 10 by pressing the portion 13 other than the center of the outer surface of the plug 10 and rotating the core in the radial direction ( Refer to Figure 3 (a) and Figure 3 (b)).

In the film roll 20, since the core plug 10 is inserted into the core 21, therefore, it is difficult to fall off during transportation, and it is difficult to remove on the other hand. However, by the above method, the core plug 10 is rotated, so that the core plug 10 can be easily removed without requiring a special tool or a large force.

The portion 13 other than the center of the outer surface of the core plug 10 is preferably located outside the center of the center and the outer edge. The pressing of the core plug 10 can be performed along the axial direction of the core 21. That is, in Fig. 2, it is possible to press in the direction from the right side to the left side. In addition, this pressing can be performed by hand. By this pressing, the core plug 10 is rotated with its diameter direction as a rotation axis (refer to FIG. 3(b)). Further, when the core plug 10 has the hardness, the size, and the like as described above, it is possible to particularly easily generate the rotation by the above-described pressing and to remove it more easily.

<Other Embodiments>

The core plug, film roll, package, and core plug removal method of the present invention are not limited to the above embodiment. For example, the number of the recesses formed in the plug for the core may be 3 or less, or may be 5 or more. Further, the concave portion may not be formed, and may be formed on both sides.

[Industrial availability]

The present invention can be suitably used as a plug attached to the core of the film roll when storing or transporting a film roll requiring a high-quality PVA film.

Claims (11)

A core plug is a core plug for a cylindrical core that is attached to a wound film, and a disk-shaped elastic body is inserted into an end portion of the core in the axial direction in a reduced diameter state. The core plug of claim 1 has a hardness of 30 N or more and 3,000 N or less. The core plug of claim 1 is mainly composed of a polyurethane, an anthrone resin, a natural rubber, a synthetic rubber or a combination thereof. The core plug of claim 1 has a ratio (T/D1) of thickness (T) to diameter (D1) of 0.05 or more and 0.3 or less. The core plug of claim 1 having 1 or a plurality of recesses formed on at least one side. A film roll comprising: a cylindrical core, a film wound around the core, and a core plug according to claim 1 which is inserted into an end portion of the core in the axial direction in a reduced diameter state. The film roll of claim 6, wherein the outer side of the core plug is attached to the same plane as the end face of the core or to the inner side of the end face of the core. The film roll of claim 6, wherein the ratio (D1/D2) of the diameter (D1) of the core plug in the non-reduced diameter state to the inner diameter (D2) of the end portion of the core is 1.005 or more and 1.05 or less. The film roll of claim 6, wherein the film is a polyvinyl alcohol film. A package comprising: a film roll according to any one of claims 6 to 9, and The packaging material for packaging the film cylinder. A method for removing a core plug according to any one of claims 6 to 9, wherein the core plug has a step of: pressing a center of an outer surface of the core plug The other part rotates the core plug with the diameter direction as the rotation axis.