TW201708061A - Core lid member and film roll - Google Patents

Abstract

Provided is a core lid member that can minimize the entry of dust into the core of a film roll and has superior working properties when conveyed using a support rod. Also provided is a film roll provided with the core lid member. This core lid member, which is to be placed on the axial ends of a cylindrical core on which a film is wound, is characterized by comprising: a main lid body having a cut-out section formed on an outer edge and penetrating in the axial direction; an auxiliary lid member that is fitted into the cut-out section; and a connecting member that is flexible and connects the main lid body and the auxiliary lid member. The core lid member is further characterized by the shape formed by the main lid body and the auxiliary lid member when the auxiliary lid member is fitted into the cut-out section of the main lid body being a shape that covers the openings on the ends of the core. The film roll comprises: a cylindrical core; a film wound onto this core; and the aforementioned core lid member placed on an axial end of the core.

Description

Core cover material and film roll

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

The long film is usually formed into a film roll wound around a cylindrical core for transportation, storage, and the like. Specifically, for example, a polyvinyl alcohol (PVA) film used for producing a green film for a polarizing film, or a cellulose triacetate (TAC) film used for protecting a polarizing film is transported by a film roll. Keep it, etc.

The optical film such as the PVA film or the TAC film described above requires particularly high precision, and the presence of dust, moisture, or the like adhering to the surface affects the quality. For example, the PVA film has high hygroscopicity and wrinkles or slack 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 is a factor of optical defects of the obtained polarizing film. Therefore, when transporting or storing, the film roll is sufficiently packaged and stored in a clean room or the like. However, when the film roll is conveyed, the support bar is often inserted into a cylindrical core, and is conveyed through a support bar, and may be packaged so as not to cover the end of the core. In this case, since the end portion of the core is exposed, dust or the like enters into the core or dew condensation occurs. Stayed in the core Dust or the like is discharged from the core due to vibration or the like when the film roll is conveyed, and is brought into contact with the film to lower the quality of the film.

Then, 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 developed (refer to Japanese Laid-Open Patent Publication No. 2000-142616). However, in the case of assembling such a cover, as described above, it is necessary to remove the cover when inserting the support rod into the core, and workability is poor.

[Previous Technical Literature] [Patent Literature]

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

The present invention is based on the invention as described above, and an object thereof is to provide a core cover member and a film roll provided therewith, which can prevent dust or the like from entering the core of the film roll, and use the support rod The workability at the time of transportation, etc. is also excellent.

In order to solve the above-mentioned problems, the invention provides a core cover member for an end portion in the axial direction of a cylindrical core of a wound film, characterized in that the cover body is provided with a cover body formed on the outer edge in the axial direction. a through-cut portion; the auxiliary cover member is fitted into the notch portion; and the connecting member has flexibility to connect the cover body and the auxiliary cover member, and the cover member is fitted into the cover portion of the cover body The shape formed by the body and the auxiliary cover material is an opening that plugs the end of the core shape.

When the cover member for the core is attached to the end portion of the core in a state where the auxiliary cover member is fitted into the notch portion of the cover body, the opening of the core end portion can be blocked by the cover main body and the auxiliary cover member, thereby suppressing Dust and the like enter the core. Further, when the core cover member is used, the auxiliary cover member can be released from the notch portion of the cover main body while being attached to the core end portion. In this way, when the support rod is conveyed or the like, the auxiliary cover member is removed, and the support rod is inserted into the core from the notch portion, and the auxiliary cover member is easily inserted again after the work is completed, so that the workability is also excellent. Further, since the cover body is still attached at the time of the work using the support bar, dust or the like can be prevented from entering the core.

The core cover member is preferably integrally molded from a synthetic resin. By using the synthetic resin to integrally form the core cover material, it is possible to increase the workability and the like of the core cover member, and it is also possible to produce at a low cost.

Preferably, the auxiliary cover member is fitted into the cutout portion in a state where the connecting member is bent. In such a case, when the auxiliary cover member is unwound from the slit portion, the bending of the joint member is cancelled, and the auxiliary cover member is opened from the slit portion, so that it is difficult for the auxiliary cover member to interfere with the insertion of the support rod. That is, by operating in this manner, workability, operability, and the like can be improved.

Preferably, the connecting member includes a sheet having an S-shaped portion in plan view. Since the connecting member has such a shape, the connecting member can be folded in a state in which the auxiliary cover member is fitted into the notch portion of the cap body, so that the auxiliary cover member can be easily inserted. this Further, in a state where the auxiliary cover member is unwound from the slit portion, the S-shaped portion of the connecting member can be unfolded, so that it is difficult for the auxiliary cover member to interfere with the insertion of the support rod. In other words, since the connecting member has such a shape, workability, operability, and the like can be improved.

Preferably, the cover body has a first bottom portion; the first wall portion is erected from an outer edge of the first bottom portion; and the first flange portion extends outward from the front end edge of the first wall portion, The auxiliary cover member has a second bottom portion, the second wall portion is erected from the outer edge of the second bottom portion, and the second flange portion projects outward from the front end edge of the second wall portion. Since the cover main body and the auxiliary cover member have such a shape, workability based on easy handling and the like is improved. Further, by the presence of the flange portion, entry of dust or the like from the gap portion can be suppressed.

Preferably, the connecting member connects the first flange portion and the second flange portion. In the case where the first flange portion and the second flange portion are connected to each other, the auxiliary cover member can be easily removed from the front side (the flange portion side), and workability and the like can be further improved.

According to another aspect of the invention, a film roll includes a cylindrical core, a film wound around the core, and the core cover member attached to an end portion of the core in the axial direction.

In the film roll, since the core cover member is attached to the end of the core, it is possible to prevent dust and the like from entering the core, and it is also excellent in workability when the support bar is used for transportation or the like.

According to the present invention, it is possible to provide a core cover member and a film roll having the same, which can prevent dust and the like from entering the film roll The workability in the core of the cylinder and the use of the support rod is also excellent.

10, 50‧ ‧ core cover material

11, 51‧‧ ‧ cover ontology

12, 52‧‧‧Auxiliary cover materials

13, 53‧‧‧ Linked components

14, 54‧‧‧cut section

15, 55‧‧‧ bottom

16‧‧‧ wall

17, 17a, 57‧‧‧Flange

18‧‧‧ Protrusion

19, 59‧‧‧ bottom

20‧‧‧ wall

21, 62‧‧‧Flange

22‧‧‧ Protrusion

23‧‧‧1st belt

24‧‧‧2nd belt

25‧‧‧3rd belt

26a, 26b‧‧‧ Hole Department

30‧‧‧ Film Roller

31‧‧ ‧ core

32‧‧‧film

33‧‧‧ end of the core

34‧‧‧ end face of the core

40‧‧‧Support rod

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

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

Fig. 3 is a front view showing a state in which the auxiliary cover member is fitted into the notch portion of the cap body in the core lid member of Fig. 1.

Fig. 4 is a side view showing a state in which the auxiliary cover member is fitted into the notch portion of the cap body in the core lid member of Fig. 1.

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

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

Fig. 7 is a front elevational view showing a state in which the auxiliary cover member is fitted into the notch portion of the cap body in the core lid member of Fig. 6.

[Formation of the Invention]

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

<Core cover material>

(First embodiment)

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

The cover body 11 is formed with a notch portion 14 that penetrates in the axial direction (the axial direction of the core 31 in a state of being attached to the core 31) on the outer edge. When viewed from the axial direction of the core 31 (front view), a part of the cover body 11 is rounded into a substantially square shape (see Fig. 1 and the like). In this way, the portion of the slit is the slit portion 14, and the lid body 11 is opened in the slit portion 14. The auxiliary cover member 12 is formed to be embedded in the cutout portion 14. Further, when the core cover member 10 (the cover body 11) is fitted into the core 31, the support rod 40 can be inserted into the notch portion 14 which is the opening portion (see FIG. 5(b)).

The cover body 11 has a bottom portion 15 (first bottom portion), a wall portion 16 (first wall portion) that is erected 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 front end edge projects toward the outside. That is, the cap body 11 has a container shape with the bottom portion 15 as a bottom. Similarly to the front view shape of the cover body 11, the bottom portion 15 has a portion in which a circle is cut into an approximately square shape. That is, the lid body 11 can also be said to have a shape in which a part of the side wall of the bottomed cylindrical container is recessed. The cover body 11 is light in weight by having such a container shape, and also has excellent grip properties, so that the mounting workability and the like of the core 31 are improved. Among the circular arc portions in the wall portion 16, a plurality of projections 18 projecting in the outer direction are provided at approximately equal intervals.

The bottom portion 15, the wall portion 16, and the flange portion 17 of the lid body 11 are formed into a substantially uniform thickness by a synthetic resin. The average thickness of the lid body 11 (bottom portion 15, wall portion 16, and flange portion 17) is, for example, about 0.01 mm or more and 3 mm or less. The shape maintenance property is improved by the average thickness being more than the above lower limit. On the other hand, by the average thickness being less than or equal to the above upper limit, The elasticity is increased, and the workability of the auxiliary cover member 12 is improved.

The size of the cap body 11 is appropriately set in accordance with the size of the core 31 of the cap blank 10 for mounting the core. That is, the outer diameter of the cap body 11 (bottom portion 15) is designed to be substantially equal to the inner diameter of the core 31. For example, the diameter of the cover body 11 that does not include the flange portion 17 can be 10 cm or more and 50 cm or less. Further, the height of the wall portion 16 is, for example, about 3 cm or more and 10 cm or less. The width of the flange portion 17 is approximately 5 mm or more and 3 cm or less. By setting the width of the flange portion 17 to such a size, it is possible to effectively prevent dust from entering from the gap between the lid body 11 and the core 31. However, the width of the flange portion 17a in the notch portion 14 can be, for example, 1 mm or more and 1 cm or less. In the portion of the cutout portion 14, as will be described later, the flange portion 21 of the auxiliary cover member 12 is overlapped, so that the width of the flange portion 17a can be narrow.

In the front view (viewed in the axial direction of the core 31), the auxiliary cover member 12 has an approximately square shape in which one side has an arc shape (see FIG. 1 and the like). The front viewing shape of the auxiliary cover member 12 is substantially the same as the front viewing shape of the cutout portion 14. As shown in FIG. 3 and the like, the shape of the cover body 11 and the auxiliary cover member 12 when the auxiliary cover member 12 is fitted into the notch portion 14 of the cover body 11 is circular in a front view. That is, the shape of the cover body 11 and the auxiliary cover member 12 when the auxiliary cover member 12 is fitted into the notch portion 14 of the cover body 11 is a shape that plugs the opening of the end portion 33 of the core 31. By the cover body 11 having such a shape and the core cover member 10 of the auxiliary cover member 12, it is possible to suppress entry of dust or the like into the core 31.

The auxiliary cover member 12 has a bottom portion 19 (second bottom portion), a wall portion 20 (second wall portion) that is erected from the outer edge of the bottom portion 19, and a flange portion 21 (second flange portion) from which the wall portion The front end edge of 20 protrudes outward. which is, The auxiliary cover member 12 has a container shape with the bottom portion 19 as a base. Since the auxiliary cover member 12 is lightweight and has excellent grip properties, the workability of inserting and detaching the notched portion 14 is improved. The bottom portion 19 has an approximately square shape in which one side is an arc shape. Among the circular arc portions in the wall portion 20, protrusions 22 projecting in the outer direction are provided.

Similarly to the lid body 11, the bottom portion 19, the wall portion 20, and the flange portion 21 of the auxiliary cover member 12 are formed into a substantially uniform thickness by a synthetic resin. This average thickness can also be set to be the same as the cover body 11.

The size of the auxiliary cover member 12 corresponds to the size of the cutout portion 14, and can be set according to the diameter of the support rod 40 of the insertion core 31 or the like. The length of one side of the approximately square which is viewed from the front surface of the auxiliary cover member 12 can be, for example, 3 cm or more and 15 cm or less. The length of one side of the approximately square which is viewed from the front side of the auxiliary cover member 12 is the same as the length of one side of the approximately square which is viewed from the front side of the cutout portion 14. The height of the wall portion 20 of the auxiliary cover member 12 or the width of the flange portion 21 can be made the same as the wall portion 16 and the flange portion 17 of the cover body 11. Since the auxiliary cover member 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 member 12 and the core 31 and the cover body 11.

The connecting member 13 has flexibility and is a sheet that joins the cap body 11 and the auxiliary cover member 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. In other words, the connecting member 13 includes a sheet having the S-shaped portion in plan view formed by the first belt portion 23, the second belt portion 24, and the third belt portion 25 (see FIG. 1 and the like). Further, a hole portion 26a and a hole portion 26b are formed in the connection portion between the first belt portion 23 and the second belt portion 24 and the connection portion between the second belt portion 24 and the third belt portion 25, respectively. As a connecting member The thickness of 13 is not particularly limited, and can be set to be the same as that of the lid body 11 and the like.

The connecting member 13 connects the flange portion 17a of the bottom edge portion of the cutout portion 14 of the cover body 11 and the flange portion 21 of the auxiliary cover member 12. Further, the first belt portion 23 and the third belt portion 25 are the same length, and are configured to be longer than the height of the wall portion 16 of the lid body 11 and the wall portion 20 of the auxiliary cover member 12. The length of the second belt portion 24 is shorter than the length of the first belt portion 23 and the third belt portion 25. With this configuration, when the auxiliary cover member 12 is fitted into the notch portion 14 of the cover body 11, the connection member 13 is not bent (folded) without being hindered, so that it can be easily inserted (see FIG. 4, 5 Figure (a)). Further, in a state in which the auxiliary cover member 12 is unwound from the notch portion 14, the bending of the connecting member 13 is cancelled and the S-shaped portion is unfolded. Therefore, when the support bar 40 is inserted or in the inserted state, the auxiliary cover is provided. The material 12 is not easily hindered (see Fig. 5(b)).

It is preferable that the lid member 10 for the core is integrally formed of a synthetic resin in the lid body 11, the auxiliary lid member 12, and the connecting member 13. By integrally molding the core lid member 10 with a synthetic resin, workability and the like based on the weight reduction of the core lid member 10 can be improved, and production can be performed at low cost. The synthetic resin for forming the core cover member 10 is not particularly limited, and examples thereof include thermoplastic resins such as polyolefin, polystyrene, polyvinyl chloride, and acrylic resin. The core lid member 10 can be molded by a known molding method such as injection molding using such a synthetic resin.

The core cover member 10 is used as a cover for inserting the axial end portion 33 of the cylindrical core 31 wound around the film 32 as shown in Figs. 5(a) and 5(b). By the core cover member 10, dust or the like can be prevented from entering the core 31, and workability when the support rod 40 is used can be improved. Available in the following In the description of the film roll of the core cover member 10, a detailed method of using the core cover member 10 has been described.

<film roll>

The film roll 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 that is attached to the core 31 in the axial direction. The core is made of a cover material 10.

The core 31 is a substantially cylindrical body having rigidity. The shape of the opening portion of the end portion 33 of the core 31 is also circular. The core 31 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. Among them, it is preferred 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. Further, the main component means a component having the highest content rate. The lower limit of the content 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, 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.

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

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

The length of the film 32 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. 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, 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 30 from becoming excessively large, and to improve the operability when attaching and detaching or moving toward the gantry or the 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, still more preferably 3 m, and particularly preferably 3.3 m. When the width of the film 32 is at least the above lower limit, an optical film (a polarizing film or the like) 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, more preferably 8 m. When the width of the film 32 is equal to or less than the above upper limit, the operability and the like are improved.

The average thickness of the film 32 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 32 in a state in which the film 32 is wound can be, for example, 50 mm or more and 1,000 mm or less.

The film 32 can be obtained by a known method such as a cast 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 cover member 10 is fitted into the end portion 33 of the core 31. The core cover members 10 are attached to both ends of the core 31, respectively. The core cover member 10 is the same as the core cover member 10 of the first to fourth drawings, and therefore the same reference numerals are given to the same components, and detailed description thereof will be omitted. Moreover, the cover main body 11 is fitted with the core 31 so that the notch part 14 may become the upper side. The auxiliary cover member 12 of the core lid member 10 is fitted into the notch portion 14 of the cap body 11 in a state where the coupling member 13 is bent. Further, the flange portion 17 and the flange portion 21 in the core cover member 10 are not fitted into the core 31 and are in contact with the end surface 34 of the core 31. In this manner, the opening of the end portion 33 of the core 31 is closed by the cap body 11 and the auxiliary cover member 12, so that entry of dust or the like into the core 31 can be suppressed.

Further, although not shown, the film 32 may be covered with a packaging material in order to prevent adhesion of dust or the like during transportation and storage of the film roll 30. In the case where the end portion of the packaging material of the cover film 32 is extruded into the core 31, it is also possible to hold the packaging material. The core cover material 10 is embedded in 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, and specifically, aluminum is vapor-deposited on the poly layer. a laminate film of ethylene terephthalate; a laminate film of polyester, aluminum foil and polyethylene; a laminate film of aluminum-deposited polyester and polyethylene; a laminate film of polyester and polyethylene which are vapor-deposited; A laminated film of glass-coated polyester and polyethylene; 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.

As shown in Fig. 5(b), when the film roll 30 is conveyed or the like using the support rod 40, the auxiliary cover member 12 can be unwound to the outside while the core cover member 10 is fitted into the core 31. The support rod 40 can be inserted into the notch portion 14 by disengaging the auxiliary cover member 12. When the auxiliary cover member 12 is unwound, the S-shaped connecting member 13 can be unfolded, so that the auxiliary cover member 12 does not interfere with insertion into the support rod 40. Further, after the work of the support bar 40 is used, the auxiliary cover member 12 is again fitted into the notch portion 14, so that entry of dust or the like can be suppressed. Further, in the operation using the support bar 40, the opening through which dust or the like can enter is only the notch portion 14, so that entry of dust or the like can be minimized.

<Core cover material>

(Second embodiment)

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

In the lid main body 51, a notch portion 54 that penetrates in the axial direction of the core in a state of being attached to the core is formed on the outer edge. Further, the cap body 51 has a bottom portion 55, a wall portion (not shown) from which the outer edge of the bottom portion 55 is erected, and a flange portion 57 projecting outward from the front end edge of the wall portion.

Under the front view (viewed in the axial direction of the core in a state of being attached to the core), the auxiliary cover member 52 has an approximately square shape in which one side is an arc shape. As shown in Fig. 7, the shape of the cover body 51 and the auxiliary cover member 52 when the auxiliary cover member 52 is fitted into the notch portion 54 of the cover body 51 is circular in a front view. In other words, the shape in which the auxiliary cover member 52 is fitted into the notch portion 54 of the cover body 51 and the auxiliary cover member 52 is a shape that plugs the opening of the end portion of the core. The auxiliary cover member 52 has a bottom portion 59, a wall portion (not shown) from which the outer edge of the bottom portion 59 is erected, and a flange portion 61 projecting outward from the front end edge of the wall portion.

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

In this core cover member 50, the auxiliary cover member 52 is embedded in the cover. When the notch portion 54 of the main body 51 is bent, the connecting member 53 is not hindered, so that it can be easily inserted (see Fig. 7). Further, in a state where the auxiliary cover member 52 is unwound from the notch portion 54, the bending of the connecting member 53 is cancelled and the S-shaped portion is unfolded, so that the auxiliary cover member is inserted at the time of insertion of the support rod or in the inserted state. 52 is hard to cause obstacles. In particular, in the core cover member 50, since the connection member 53 is coupled to the flange portion 57 at a position other than the notch portion 54 of the cover body 51, the auxiliary cover member 52 can be sufficiently reduced when the support rod is inserted. And the connecting member 53 hinders the insertion of the support rod.

<Other Embodiments>

The core cover member and film roll of the present invention are not limited to the above embodiment. The connecting member may be, for example, a linear shape (belt shape) or an L shape. Such a shape can also produce a function as a joining member. Further, for example, when the connecting member is formed into a strip shape having a sufficient length, the connecting member is bent when the auxiliary cover member is fitted into the slit portion. In such a case, when the auxiliary cover member is unwound from the slit portion, the bending of the connecting member is canceled, and the auxiliary cover member can be moved to a position away from the notch portion, so that the insertion of the support rod can be easily performed.

Further, in the above embodiment, the core cover member is configured to be embedded in the core, but may be configured to cover the entire end of the core. Further, the cover body, the auxiliary cover member, and the connecting member may be made of other materials. Further, the core cover member is not limited to a synthetic resin, and may be formed of, for example, metal, cloth, paper, or a composite member thereof. The core for mounting the core lid member is not limited to a cylindrical shape in the case of a cylindrical shape, and may be, for example, a square tube shape. Core cover material, by making The shape corresponding to the shape of the end portion of the core can exert the effects of the present invention.

[Industrial availability]

The core cover material of the present invention can be used as a core of a film roll for an optical film such as a PVA film, because it can suppress dust and the like from entering the core of the film roll, and is excellent in workability when being transported by a support bar. Cover material.

Claims (7)

A core cover member for use in a core cover member for attaching an end portion of a cylindrical core of a wound film in the axial direction, characterized in that the cover body is provided with a cover body formed on the outer edge in the axial direction. a cutout portion; the auxiliary cover member is fitted into the cutout portion; and the connection member has flexibility to connect the cover body and the auxiliary cover member, and the cover member is fitted into the cutout portion of the cover body and The shape of the auxiliary cover member is a shape that plugs the opening of the end portion of the core. The core cover material of claim 1, which is integrally molded by a synthetic resin. The core cover member according to claim 1, wherein the auxiliary cover member is fitted into the cutout portion in a state where the coupling member is bent. A core cover material according to claim 1, wherein the joint member comprises a sheet having an S-shaped portion in plan view. The cover member for a core according to claim 1, wherein the cover body has a first bottom portion; the first wall portion is erected from an outer edge of the first bottom portion; and the first flange portion is formed from a front end of the first wall portion The auxiliary cover material has a second bottom portion, the second wall portion is erected from the outer edge of the second bottom portion, and the second flange portion is outwardly from the front end edge of the second wall portion. The direction is extended. The core cover member according to claim 5, wherein the connecting member connects the first flange portion and the second flange portion. A film roll comprising: a cylindrical core; a film wound around the core; and a core cover member according to any one of claims 1 to 6 attached to an end portion of the core in the axial direction.