TWI673211B - Core cover material and film roll - Google Patents

Abstract

Provided is a cover material for a core, and a film roll including the same. The core cover material can prevent dust and the like from entering the core of the film roll, and is excellent in workability when using a support rod for transportation. The cover material for a core of the present invention is a cover material for a core that is attached to an end portion in the axial direction of a cylindrical core wound with a film. The cover material for a core includes a cover body, and A cut-out portion penetrating in the axial direction; an auxiliary cover material embedded in the cut-out portion; and a connecting member having flexibility to connect the cover body and the auxiliary cover material, the auxiliary cover material being inserted into the cut-out portion of the cover body The shape of the cover body and the auxiliary cover material in the world is a shape that plugs the opening at the end of the core. The film roll of the present invention is a film roll including a cylindrical core, a film wound around the core, and the core cover material attached to an end portion in the axial direction of the core.

Description

Cover material for core and film roller

The present invention relates to a cover material for a core and a film roll.

The long film is usually a film roll wound around a cylindrical core for transportation, storage, and the like. Specifically, for example, a polyvinyl alcohol (PVA) film used as a blank film for manufacturing a polarizing film, or a cellulose triacetate (TAC) film used for protecting a polarizing film is transported by a film roll, Custody, etc.

The optical films such as the PVA film and the TAC film are required to have particularly high accuracy, and the presence of dust, moisture, etc. attached to the surface will affect the quality. For example, a PVA film is highly hygroscopic, and wrinkles or sags are caused by contact with moisture. Such defects show unevenness in the polarization characteristics of the polarizing film and the like. In addition, foreign matter such as dust adhered to the surface of the PVA film becomes a factor of optical defects of the obtained polarizing film. Therefore, during transportation or storage, the film drum is sufficiently packed and stored in a clean room or the like. However, when transporting a film roll, etc., a support rod is often inserted into a cylindrical core, conveyed through the support rod, and the like, and may not be packaged so as to cover the end of the core. In this case, since the end of the core is exposed, dust or the like may enter the core, or condensation may occur. Stuck in the core Dust and the like are discharged from the core due to vibration and the like when the film roll is transported, and come into contact with the film, thereby deteriorating the quality of the film.

Then, a film packing cover inserted into the core to prevent dust or the like from entering the core of the film roll has been developed (see Japanese Patent Application Laid-Open No. 2000-142616). However, when assembling such a lid, the lid must be removed when the support rod is inserted into the core, as described above, and workability is poor.

[Prior technical literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2000-142616

The present invention is based on the above-mentioned circumstances. The object of the present invention is to provide a cover material for a core, and a film roller having the same. The core cover material can prevent dust and the like from entering the core of the film roller, and uses a support rod It is also excellent in workability during transportation and the like.

The invention completed in order to solve the above-mentioned problems is a core cover material for attaching to an axial direction end portion of a cylindrical core wound with a film, and includes a cover body having an outer edge formed in the axial direction. A cut-out portion that penetrates; an auxiliary cover material that is embedded in the cut-out portion; and a connecting member that is flexible and connects the cover body and the auxiliary cover material, and the cover when the auxiliary cover material is embedded in the cut-out portion of the cover body The shape of the main body and the auxiliary cover material is to block the opening at the end of the core. shape.

When the core cover material is used, the auxiliary cover material is fitted to the end portion of the core in a state where the auxiliary cover material is inserted into the cutout portion of the cover body, so that the opening at the core end portion can be blocked by the cover body and the auxiliary cover material, and the core cover can be suppressed. Dust, etc. enters the core. In addition, by using the core cover material, the auxiliary cover material can be released from the cutout portion of the cover body in a state of being mounted on the core end portion. This allows the auxiliary cover material to be removed to insert the support rod into the core from the cutout portion when the support rod is used for conveyance, etc., and the auxiliary cover material can be easily inserted again after the operation is completed, so the workability is also excellent. In addition, since the cover body is still attached during work using the support rod, dust and the like can be suppressed from entering the core.

The cover material for the core is preferably integrally formed using a synthetic resin. By integrally molding the cover material for the core using a synthetic resin, workability and the like can be improved by reducing the weight of the cover material for the core, and it can be produced at low cost.

Preferably, the auxiliary cover material is fitted into the cutout portion in a state where the connecting member is bent. In such a case, when the auxiliary cover material is released from the cutout portion, the bending of the connecting member is eliminated, and the auxiliary cover material is separated from the cutout portion. Therefore, it is difficult for the auxiliary cover material to interfere with the insertion of the support rod. That is, by operating in this manner, workability, operability, and the like can be improved.

The connection member is preferably a sheet including an S-shaped portion in a plan view. With the shape of the connecting member, the connecting member can be folded while the auxiliary cover material is fitted into the cutout portion of the cover body, and thus the auxiliary cover material can be easily inserted. this In addition, the auxiliary cover material can be unfolded by the S-shaped portion of the connecting member in a state in which the auxiliary cover material is released from the cutout portion. Therefore, the auxiliary cover material is difficult to interfere with the insertion of the support rod. That is, when the connecting member has such a shape, workability, operability, and the like can be improved.

Preferably, the cover main body includes: a first bottom portion; a first wall portion which is erected from an outer edge of the first bottom portion; and a first flange portion which projects outward from a front edge of the first wall portion. The auxiliary cover material includes a second bottom portion, a second wall portion that stands up from an outer edge of the second bottom portion, and a second flange portion that projects outward from a front edge of the second wall portion. Since the cover body and the auxiliary cover material have such shapes, workability based on easy handling and the like is improved. In addition, the presence of the flange portion can prevent dust or the like from entering the gap portion.

The connection member preferably connects the first flange portion and the second flange portion. In this way, when the first flange portion and the second flange portion are connected by the connecting member, it becomes easy to remove the auxiliary cover material on the front side (flange portion side), which can further improve workability and the like.

Another invention accomplished in order to solve the above-mentioned problem is a film roll including a cylindrical core, a film wound around the core, and the core cover material attached to an end portion in the axial direction of the core.

This film roll is equipped with the above-mentioned core cover material at the end of the core, so that dust and the like can be prevented from entering the core, and workability when using a support rod for transportation is also excellent.

According to the present invention, it is possible to provide a cover material for a core and a film roll having the same, which can prevent dust and the like from entering the film roll. It also has excellent workability in the core of the tube and when it is transported using a support rod.

10, 50‧‧‧ core cover material

11, 51‧‧‧ cover body

12, 52‧‧‧ auxiliary cover material

13, 53‧‧‧ connecting members

14, 54‧‧‧ Notch

15, 55‧‧‧ bottom

16‧‧‧ wall

17, 17a, 57‧‧‧ flange

18‧‧‧ protrusion

19, 59‧‧‧ bottom

20‧‧‧Wall

21, 62‧‧‧ flange

22‧‧‧ protrusion

23‧‧‧Part 1

24‧‧‧Part 2

25‧‧‧Part 3

26a, 26b‧‧‧Hole

30‧‧‧ film drum

31‧‧‧ core

32‧‧‧ film

33‧‧‧ core end

34‧‧‧ core end face

40‧‧‧ support rod

FIG. 1 is a front view of a core cover material according to an embodiment of the present invention.

Fig. 2 is a perspective view of the core cover material of Fig. 1.

Fig. 3 is a front view showing a state in which the auxiliary cover material is fitted into the cutout portion of the cover body in the core cover material of Fig. 1.

FIG. 4 is a side view showing a state where the auxiliary cover material is fitted into the cutout portion of the cover body in the core cover material of FIG. 1.

Fig. 5 (a) is an explanatory diagram showing a first use state of the film roll according to the embodiment of the present invention. Fig. 5 (b) is an explanatory diagram showing a second use state of the film roll of Fig. 5 (b).

Fig. 6 is a front view of a core cover material different from the core cover material of Fig. 1.

FIG. 7 is a front view showing a state in which the auxiliary cover material is fitted into the cutout portion of the cover body in the core cover material of FIG. 6.

[Form of Implementing Invention]

Hereinafter, a cover material for a core and a film roll according to an embodiment of the present invention will be described in detail with reference to appropriate drawings.

<Cover material for core>

(First Embodiment)

The core cover material 10 in FIGS. 1 to 4 includes a cover body 11, an auxiliary cover material 12, and a connection member 13. The core cover material 10 is, as shown in Figs. 5 (a) and 5 (b), attached to the axial direction of the cylindrical core 31 around which the film 32 is wound. 33 at the ends.

The cover body 11 is formed with a cutout portion 14 formed in an outer edge thereof and penetrating in the axial direction (the axial direction of the core 31 in a state of being mounted on the core 31). When viewed from the axial direction of the core 31 (front view), a part of the circle of the lid body 11 is cut into a substantially square shape (see FIG. 1 and the like). The portion that is cut in this manner is a cut portion 14, and the cover body 11 is opened in this cut portion 14. The auxiliary cover material 12 is formed so as to fit into the cutout portion 14. In addition, when the core cover material 10 (the cover body 11) is fitted into the core 31, the support rod 40 can be inserted into the cutout portion 14 (see FIG. 5 (b)) which is an opening portion.

The cover main body 11 includes a bottom portion 15 (first bottom portion), a wall portion 16 (first wall portion), which is provided to stand from the outer edge of the bottom portion 15, and a flange portion 17 (first flange portion) from which the wall portion 16 is provided. The leading edge of the head protrudes outward. That is, the lid body 11 has a container shape with the bottom 15 as a bottom. Similarly to the shape of the cover main body 11 when viewed from the front, the bottom portion 15 has a round portion that is cut into a substantially square shape. That is, the lid body 11 can be said to have a shape in which a part of the side wall of the bottomed cylindrical container is recessed. The lid body 11 is lightweight by having such a container shape, and is also excellent in gripping properties, so that the workability for mounting the core 31 is improved. In the arc portion in the wall portion 16, a plurality of protrusions 18 protruding in the outer direction are provided at approximately equal intervals.

The bottom part 15, the wall part 16, and the flange part 17 of the cover main body 11 are shape | molded by synthetic resin so that it may become approximately uniform thickness. The average thickness of the cover body 11 (the bottom portion 15, the wall portion 16, and the flange portion 17) is, for example, about 0.01 mm to 3 mm. When the average thickness is at least the above lower limit, the shape maintainability is improved. On the other hand, since the average thickness is below the above upper limit, The elasticity is improved, and the inserting workability of the auxiliary cover material 12 is improved.

The size of the cover body 11 is appropriately set according to the size of the core 31 of the cover material 10 for mounting the core. That is, the outer diameter of the cover main body 11 (bottom 15) is designed so that it may become substantially equal to the inner diameter of the core 31. For example, the diameter of the cover main body 11 that does not include the flange portion 17 can be set to 10 cm or more and 50 cm or less. The height of the wall portion 16 is, for example, about 3 cm to 10 cm. The width of the flange portion 17 is about 5 mm to 3 cm. By setting the width of the flange portion 17 to such a size, entry of dust from the gap between the cover body 11 and the core 31 and the like can be effectively suppressed. However, the width of the flange portion 17a in the cutout portion 14 can be, for example, 1 mm or more and 1 cm or less. Since the notch portion 14 overlaps the flange portion 21 of the auxiliary cover material 12 as described later, the width of the flange portion 17 a may be narrow.

When viewed from the front (viewed in the axial direction of the core 31), the auxiliary cover material 12 has an approximately square shape with one side having an arc shape (see FIG. 1 and the like). The front view shape of the auxiliary cover material 12 is substantially the same as the front view shape of the cutout portion 14. As shown in FIG. 3 and the like, the shape formed by the cover body 11 and the auxiliary cover material 12 when the auxiliary cover material 12 is fitted into the cutout portion 14 of the cover body 11 is circular when viewed from the front. That is, the shape formed by the cover body 11 and the auxiliary cover material 12 when the auxiliary cover material 12 is fitted into the cutout portion 14 of the cover body 11 is a shape that plugs the opening of the end portion 33 of the core 31. With the core cover material 10 having the cover body 11 and the auxiliary cover material 12 having such shapes, it is possible to prevent dust or the like from entering the core 31.

The auxiliary cover material 12 includes: a bottom portion 19 (second bottom portion); a wall portion 20 (second wall portion), which is provided standingly from the outer edge of the bottom portion 19; The front edge of 20 protrudes outward. which is, The auxiliary cover material 12 has a container shape with a bottom 19 as a bottom. The auxiliary cover material 12 is lightweight because it has such a container shape, and it is also excellent in gripping property, so that the workability for inserting and removing the cutout portion 14 is improved. The bottom portion 19 has an approximately square shape with a circular arc on one side. The arc portion in the wall portion 20 is provided with a protrusion 22 protruding in the outer direction.

The bottom portion 19, the wall portion 20, and the flange portion 21 of the auxiliary cover material 12 are also formed into a substantially uniform thickness using a synthetic resin in the same manner as the cover body 11. This average thickness can also be set to be the same as that of the cover body 11.

The size of the auxiliary cover material 12 corresponds to the size of the cutout portion 14 and can be set according to the diameter of the support rod 40 inserted into the core 31 and the like. The length of one side of a substantially square as viewed from the front side of the auxiliary cover material 12 can be, for example, 3 cm or more and 15 cm or less. The length of one side of a substantially square as viewed from the front of the auxiliary cover 12 is the same as the length of one side of a substantially square as viewed from the front of the cutout 14. The height of the wall portion 20 or the width of the flange portion 21 of the auxiliary cover material 12 can be set to be the same as the wall portion 16 and the flange portion 17 of the cover body 11. Since the auxiliary cover material 12 is also provided with the flange portion 21 over the entire circumference, it is possible to suppress entry of dust or the like from the gap between the auxiliary cover material 12 and the core 31 and the cover body 11.

The connecting member 13 has flexibility and is a sheet that connects the cover body 11 and the auxiliary cover material 12. The connecting member 13 is formed by connecting the first belt portion 23, the second belt portion 24, and the third belt portion 25 in an S shape. That is, the connecting member 13 includes a sheet having an S-shaped portion in a plan view formed by the first band portion 23, the second band portion 24, and the third band portion 25 (see the first figure and the like). Further, a hole portion 26a and a hole portion 26b are formed in a connecting portion of the first band portion 23 and the second band portion 24, and a connecting portion of the second band portion 24 and the third band portion 25, respectively. As a link The thickness of 13 is not particularly limited, and can be the same as that of the cover body 11 and the like.

The connecting member 13 connects the flange portion 17 a of the bottom portion of the cutout portion 14 of the cover body 11 and the flange portion 21 of the auxiliary cover material 12. The first band portion 23 and the third band portion 25 have the same length and are configured to be longer than the height of the wall portion 16 of the cover body 11 and the wall portion 20 of the auxiliary cover material 12. The length of the second belt portion 24 is shorter than the lengths of the first belt portion 23 and the third belt portion 25. With such a structure, when the auxiliary cover material 12 is fitted into the cutout portion 14 of the cover body 11, the connecting member 13 can be bent (folded) without hindrance, so that it can be easily inserted (see FIG. 4, FIG. Figure 5 (a)). In addition, in a state where the auxiliary cover material 12 is released from the cutout portion 14, the bending of the connecting member 13 is eliminated and the S-shaped portion is unfolded. Therefore, when the support bar 40 is inserted, or when the auxiliary rod 40 is inserted, the auxiliary cover 12 The material 12 is unlikely to cause an obstacle (see FIG. 5 (b)).

The cover material 10 for the core is preferably formed integrally from a synthetic resin by the cover body 11, the auxiliary cover material 12 and the connecting member 13. By integrally molding the core cover material 10 using a synthetic resin, the workability and the like of the core cover material 10 are reduced in weight, and it can be produced at low cost. The synthetic resin forming the core cover material 10 is not particularly limited, and examples thereof include thermoplastic resins such as polyolefin, polystyrene, polyvinyl chloride, and acrylic resin. The core cover material 10 can be molded by a known molding method such as injection molding using such a synthetic resin.

This core cover material 10 is a cover used as the axial direction end part 33 of the cylindrical core 31 in which the film 32 was wound, as shown in FIG. 5 (a) and FIG. 5 (b). This core cover material 10 can prevent dust or the like from entering the core 31 and can also improve workability when the support rod 40 is used. In the following In the description of the film roll of this core cover material 10, the detailed usage method of this core cover material 10 was demonstrated.

<Film roll>

The film drum 30 of FIGS. 5 (a) and 5 (b) includes a cylindrical core 31, a film 32 wound around the core 31, and an end portion 33 attached to the core 31 in the axial direction.的 芯 用 盖 材 10。 The core material 10.

The core 31 is a substantially cylindrical body. The shape of the opening portion of the end portion 33 of the core 31 is also circular. Examples of the core 31 include metal, synthetic resin, paper, and wood. In addition, 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, and the like. Among them, a metal, a synthetic resin, or a combination thereof is preferably used as a main component. In addition, since it is hard to be affected by abrasion and the like even if it is repeatedly used, it is more preferable to use a metal as a main component. The main component refers to a component having the highest content rate. The lower limit of the content ratio of the metal and the synthetic resin in the core 31 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, and aluminum, and iron and aluminum are preferred in terms of strength and lightness. They can be used singly or in combination.

Examples of the synthetic resin include polyvinyl chloride, polyvinylidene chloride, polyester, polycarbonate, polyamide, epoxy resin, polyurethane, polyurea, and silicone resin. Polyvinyl chloride is preferred. In addition, in terms of strength, fiber-reinforced plastics (FRP) such as carbon fiber-reinforced plastics are also preferable. They can be used singly or in combination.

The outer diameter and inner diameter of the core 31 are not particularly limited, and for example, the inner diameter can be set to about 10 cm to 50 cm. The axial length of the core 31 can be appropriately set according to the width of the wound film 32. The axial length of the core 31 can be, for example, 2 m or more and 10 m or less.

The film 32 wound around the core 31 is not particularly limited, and examples thereof include polyvinyl alcohol (PVA) film, cellulose triacetate (TAC) film, polyester film, polyamide film, norbornene-based 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, and particularly a PVA film, the effects of the present invention can be more significantly exhibited. This is because the PVA film is required to be a high-quality film or the like as a base material film for producing a polarizing film.

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

The length of the film 32 is not particularly limited, and as a lower limit, it is preferably 1,000 m, more preferably 2,000 m, even more preferably 5,000 m, and particularly preferably 8,000 m. When the length is greater than or equal to the above-mentioned lower limit, it is possible to suppress a large proportion of the loss generated at the start of winding or the end of winding with respect to the entirety, and also improve workability. On the other hand, the upper limit of the length of the film 32 is, for example, preferably 20,000 m, more preferably 15,000 m, and even more preferably 10,000 m. When the length is equal to or less than the above-mentioned upper limit, it is possible to prevent the quality or diameter of the film roll 30 from becoming excessively large, and to improve the operability when attaching or detaching the film roll 30 to or from a stand or a processing apparatus.

The width of the film 32 is not particularly limited, and as a lower limit, It is preferably 2 m, more preferably 2.1 m, even more preferably 3 m, and particularly preferably 3.3 m. When the width of the film 32 is greater than or equal to the above-mentioned lower limit, an optical film (such as a polarizing film) having a larger area can be obtained. On the other hand, the upper limit of the width of the film 32 is preferably 10 m, and more preferably 8 m. When the width of the film 32 is equal to or less than the above upper limit, operability and the like are improved.

The average thickness of the thin film 32 depends on the material, application, and the like, and can be set to, for example, 5 μm to 500 μm. The thickness of the entire layer of the film 32 in a state where the film 32 is wound can be, for example, 50 mm or more and 1,000 mm or less.

The thin film 32 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, and a melt extrusion film forming method.

The core cover material 10 is fitted into the end portion 33 of the core 31. The core cover material 10 is attached to both ends of the core 31, respectively. The core cover material 10 is the same as the core cover material 10 in FIGS. 1 to 4, and therefore, the same reference numerals are assigned and detailed descriptions are omitted. The cover body 11 is fitted into the core 31 so that the cutout portion 14 is positioned on the upper side. The auxiliary cover material 12 of the core cover material 10 is fitted into the cutout portion 14 of the cover body 11 in a state where the connecting member 13 is bent. In addition, the flange portion 17 and the flange portion 21 in the core cover material 10 are not embedded in the core 31 and are in contact with the end surface 34 of the core 31. In this manner, since the opening of the end portion 33 of the core 31 is blocked by the cover body 11 and the auxiliary cover material 12, dust and the like can be suppressed from entering the core 31.

Although not shown, the film 32 may be covered with a packaging material in order to prevent the adhesion of dust and the like during transportation and storage of the film drum 30 and the like. In the case where the end of the packaging material of such a cover film 32 is squeezed into the core 31, it can also be obtained by holding the packaging material. The core cover material 10 is fitted into the end portion 33 of the core 31.

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 and a polyethylene film. Examples of the laminated film include a laminated film of a plurality of resin layers, a laminated film of a resin layer and a vapor-deposited layer, a laminated film of a resin layer and a metal foil, and the like. Specifically, aluminum can be vapor-deposited on a polymer film. Laminated film of ethylene terephthalate; laminated film of polyester, aluminum foil and polyethylene; laminated film of polyester and polyethylene vapor-deposited aluminum; laminated film of polyester and polyethylene vapor-deposited alumina; Laminated films of glass-coated polyester and polyethylene; laminated films of polypropylene and polyethylene coated with polyvinylidene chloride. Packaging materials can be used alone or in combination of two or more.

As shown in FIG. 5 (b), when the film roll 30 is transported or the like using the support bar 40, the auxiliary cover material 12 can be released outside while the core cover material 10 is embedded in the core 31. By releasing the auxiliary cover material 12, the support rod 40 can be inserted into the cutout portion 14. When the auxiliary cover material 12 is disengaged, the S-shaped connecting member 13 can be unfolded, so the auxiliary cover material 12 does not interfere with the insertion of the support bar 40. In addition, after the operation using the support rod 40, the auxiliary cover material 12 is fitted into the cutout portion 14 again, so that entry of dust or the like can be suppressed. In addition, in the work using the support bar 40, the openings through which dust and the like can enter are only the cutout portions 14, and thus the entry of dust and the like can be minimized.

<Cover material for core>

(Second Embodiment)

The core cover material 50 of FIGS. 6 and 7 includes a cover body 51 and an auxiliary cover 材 52 and connection member 53. The core cover material 50 is also attached to an end portion in the axial direction of the core of the wound film to prevent dust or the like from entering the core. The core cover material 50 has a shape similar to that of the core cover material 10 in FIG. 1, but in particular, the position and shape of the connection member 53 are different from those of the connection member 13 in FIG. 1. The material or size of the core cover material 50 is the same as that of the core cover material 10 in FIG. 1.

The cover body 51 has a cutout portion 54 formed on the outer edge thereof and penetrating in the axial direction of the core in a state of being mounted on the core. In addition, the cover body 51 includes a bottom portion 55, a wall portion (not shown) provided upright from an outer edge of the bottom portion 55, and a flange portion 57 protruding outward from a front edge of the wall portion.

When viewed from the front (viewed in the axial direction of the core in a state of being mounted on the core), the auxiliary cover material 52 has a substantially square shape with one side having an arc shape. As shown in FIG. 7, the shape of the cover body 51 and the auxiliary cover material 52 when the auxiliary cover material 52 is fitted into the cutout portion 54 of the cover body 51 is circular when viewed from the front. That is, the shape formed by the cover body 51 and the auxiliary cover material 52 when the auxiliary cover material 52 is fitted into the cutout portion 54 of the cover body 51 is a shape that plugs the opening at the end of the core. The auxiliary cover material 52 includes a bottom portion 59, a wall portion (not shown) provided upright from an outer edge of the bottom portion 59, and a flange portion 61 protruding outward from a front edge of the wall portion.

The connecting member 53 has flexibility and is a sheet connecting the cover body 51 and the auxiliary cover material 52. The connecting member 53 has an S-shaped portion in a plan view, and specifically has a shape in which mainly five band portions are alternately connected. The connecting member 53 connects the flange portion 57 of the cover body 51 and the flange portion 61 of the auxiliary member 52. However, in the flange portion 57 of the cover body 51, the connecting member 53 is connected to the flange portion 57 of a portion other than the cutout portion 54.

In this core cover material 50, the auxiliary cover material 52 is fitted into the cover. In the case of the cutout portion 54 of the main body 51, the connecting member 53 can be easily bent without being hindered (see FIG. 7). In addition, in a state where the auxiliary cover material 52 is released from the cutout portion 54, the bending of the connecting member 53 is eliminated and the S-shaped portion is unfolded. Therefore, the auxiliary cover material is inserted when the support rod is inserted or in the inserted state. 52 is difficult to cause obstacles. In particular, in this core cover material 50, the connecting member 53 is connected to the flange portion 57 at a position other than the cutout portion 54 of the cover body 51, so that the auxiliary cover material 52 can be sufficiently reduced when the support rod is inserted And the case where the connection member 53 prevents the support rod from being inserted.

<Other embodiments>

The cover material for cores and the film roll of the present invention are not limited to the embodiments described above. As the connection member, for example, a shape such as a linear shape (belt shape) or an L shape may be used. Such a shape can also function as a connection member. In addition, for example, when the connecting member is formed into a belt-like shape having a sufficient length, the connecting member is in a bent state when the auxiliary cover material is fitted into the cutout portion. In such a case, when the auxiliary cover material is released from the cutout portion, the bending of the connecting member is eliminated, and the auxiliary cover material can be moved to a position away from the cutout portion, so that the support rod can be easily inserted.

Moreover, in the said embodiment, although the cover material for cores has the structure which fits in a core, it is good also as a structure which covers the edge part of the whole surface of a core. In addition, the cover body, the auxiliary cover material, and the connecting member may be made of other materials. The cover material for the core is not limited to a synthetic resin, and may be formed of, for example, metal, cloth, paper, or a composite member thereof. The core of the cover material for mounting the core is not limited to a cylindrical shape as long as it is cylindrical, and may be, for example, a rectangular cylinder. Cover material for core Forming a shape corresponding to the shape of the end portion of the core can exhibit the effects of the present invention.

[Industrial availability]

The core cover material of the present invention can prevent dust and the like from entering the core of the film roll, and also has excellent workability when using a support rod for transportation and the like. Therefore, it can be suitably used as a core of a film roll for optical films such as PVA films Cover material.

Claims (7)

A cover material for a core is a cover material for a core which is attached to an axial end of a cylindrical core wound with a film, and is characterized by comprising: a cover main body, and an outer edge formed therethrough in the axial direction A cutout portion; an auxiliary cover material that fits into the cutout portion; and a connecting member that has flexibility to connect the cover body and the auxiliary cover material, and the cover body and the cover body when the auxiliary cover material is inserted into the cutout portion of the cover body The shape formed by the auxiliary cover material is a shape that closes the opening of the end of the core. The cover material for a core according to claim 1 is integrally formed using synthetic resin. The core cover material according to claim 1, wherein the auxiliary cover material is fitted into the cut-out portion in a state where the connecting member is bent. The cover material for a core according to claim 1, wherein the connecting member includes a sheet having an S-shaped portion in a plan view. The cover material for a core according to claim 1, wherein the cover body has: a first bottom portion; a first wall portion, which is erected from the outer edge of the first bottom portion; and a first flange portion, from the front end of the first wall portion The rim extends outward, and the auxiliary cover material includes: a second bottom portion; a second wall portion that is erected from the outer edge of the second bottom portion; and a second flange portion that is outward from the front edge of the second wall portion Stretch out. The core cover material according to claim 5, wherein the connecting member connects the first flange portion and the second flange portion. A film drum comprising: a cylindrical core; a film wound around the core; and a core cover material according to any one of claims 1 to 6, which is attached to an axial end of the core.