KR20180026516A - Core lid member and film roll - Google Patents

Abstract

Provided is a lid for a core which can suppress entry of dust into the core of a film roll and which also has excellent workability when transporting using a support bar, and a film roll having the core lid. The lid material for a core of the present invention is a lid material for a core for attaching to an axial end portion of a conventional core in which a film is wound and is provided with a lid body (not shown) 11), an auxiliary lid member (12) fitted to the notch portion, and a connecting member (13) having flexibility and connecting the lid body and the auxiliary lid member, wherein the auxiliary lid member And the shape of the lid body and the auxiliary lid member when sandwiched in the notch portion is a shape for closing the opening of the end portion of the core. The film roll of the present invention is a film roll comprising a conventional core 31, a film 32 wound on the core, and a lid material for the core attached to an end portion in the axial direction of the core.

Description

[0001] CORE LID MEMBER AND FILM ROLL [0002]

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

The elongated film is usually a film roll wrapped around a cylindrical core, and is transported and stored. Specifically, for example, a polyvinyl alcohol (PVA) film used as a fabric or the like for producing a polarizing film, a triacetyl cellulose (TAC) film used for protecting a polarizing film, Storage and so on.

The optical films such as the PVA film and the TAC film are particularly required to have high precision, and the presence of dust or moisture attached to the surface affects the quality. For example, a PVA film has high hygroscopicity and wrinkles or sags due to contact with moisture. Such defects cause non-uniformity of polarization characteristics of the polarizing film. In addition, foreign matter such as dust adhering to the surface of the PVA film may be a factor of optical defects of the resulting polarizing film. Therefore, when transporting or storing, the film roll is sufficiently packed and stored in a clean room or the like. However, at the time of transporting the film roll or the like, in many cases, a support rod is inserted into a cylindrical core and carrying is carried out via a support rod, and the packaging is not sometimes carried out so as to cover the end portion of the core. In this case, since the end portion of the core is in an exposed state, dust or the like may enter the core and condensation may occur. Dust collected in the core is released from the core due to vibration or the like during transportation of the film roll, and comes into contact with the film, thereby deteriorating the quality of the film.

Here, in order to prevent dust and the like from entering the core of the film roll, a cap for film packing sandwiched between the cores has also been developed (see Japanese Unexamined Patent Publication No. 2000-142616). However, when such a cap is mounted, it is necessary to remove the cap when inserting the support rod into the core, as described above, and the workability is poor.

Japanese Patent Application Laid-Open No. 2000-142616

It is an object of the present invention to provide a cover member for a core which can suppress entry of dust into the core of a film roll and which has excellent workability such as transportation by using a support bar, And a film roll having the film roll.

The present invention made to solve the above problems is a lid material for a core for attaching to an axial end portion of a conventional core in which a film is wound, comprising: a lid body in which a notch portion penetrating in the axial direction is formed on the outer edge; And a connecting member having flexibility and connecting the lid body to the auxiliary lid member, wherein the auxiliary lid member is provided with a lid body when the auxiliary lid body is fitted into the notch of the lid body, And the shape formed by the body and the auxiliary lid member is a shape for blocking the opening of the end of the core.

According to the core lid member, the opening of the core end portion can be closed by the lid body and the auxiliary lid member by attaching the auxiliary lid member to the end portion of the core in a state where the lid member is fitted in the notch portion of the lid body, Can be suppressed. According to the cover member for a core, the auxiliary cover member can be detached from the notch portion of the cover main body in a state of being attached to the core end portion. Therefore, when conveying using the support rods, the auxiliary lid material is removed, the support rods are inserted into the core from the cutouts, and the auxiliary lid material can be easily inserted again after the completion of the work, . In addition, even when working with the support rods, since the lid body is attached, it is also possible to suppress entry of dust or the like into the core.

It is preferable that the cover material for a core is formed integrally with a synthetic resin. Since the core lid member is integrally formed by the synthetic resin, the workability of the core lid member is reduced by the weight reduction, and production at low cost becomes possible.

In a state in which the connecting member is bent, the auxiliary lid member is preferably fitted in the notch. In such a case, when the auxiliary lid member is removed from the cutout, the bending of the linking member is relieved and the auxiliary lid member is separated from the cutout, so that the auxiliary lid member is difficult to interfere with when the support rod is fitted. That is, by doing so, workability and handling properties can be improved.

It is preferable that the connecting member is made of a sheet material having an S-shaped portion when viewed from the top. Since the connecting member has such a shape, the connecting member can be folded in a state in which the auxiliary lid member is fitted in the notch portion of the lid body, so that the auxiliary lid member can be easily inserted. Further, since the auxiliary lid member can be extended in the S-shaped portion of the connecting member in a state where the auxiliary lid member is removed from the cutout, the auxiliary lid member is less likely to interfere with the support rod. That is, when the connecting member has such a shape, workability and handling property can be improved.

Wherein the cover body includes a first bottom portion, a first wall portion formed upright from an outer edge of the first bottom portion, and a first flange portion extending outwardly from a leading edge of the first wall portion, , A second bottom portion, a second wall portion formed upright from the outer edge of the second bottom portion, and a second flange portion extending outward from the leading edge of the second wall portion. Since the lid body and the auxiliary lid member are of the same shape, workability due to ease of handling and the like is improved. Further, the presence of the flange portion can suppress entry of dust or the like from the gap portion.

And the connecting member connects the first flange portion and the second flange portion. In this way, when the connecting member connects the first flange portion and the second flange portion, the auxiliary lid material can be easily peeled off to the front side (flange side), and workability and the like can be further improved.

Another invention made to solve the above problems is a film roll comprising a normal core, a film wound around the core, and a covering member for the core attached to an end portion in the axial direction of the core.

This film roll is capable of suppressing entry of dust or the like into the core because the cover member for the core is attached to the end portion of the core, and also has excellent workability when transporting using a support rod.

According to the present invention, it is possible to provide a lid material for a core which can suppress entry of dust and the like into the core of a film roll and which is also excellent in workability when transporting using a support rod, and a film roll have.

1 is a front view of a lid material for a core according to an embodiment of the present invention.
Fig. 2 is a perspective view of the cover member for a core of Fig. 1. Fig.
3 is a front view showing a state in which the auxiliary lid material is fitted in the notch portion of the lid body in the lid material for a core of Fig. 1;
Fig. 4 is a side view showing a state in which the auxiliary lid member is fitted in the notch portion of the lid body in the lid member for a core of Fig. 1. Fig.
5 (a) is an explanatory view showing a first use state of a film roll according to an 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).
6 is a front view of a cover member for a core different from the cover member for a core of Fig.
Fig. 7 is a front view showing a state in which the auxiliary lid member is fitted into the notch portion of the lid body in the lid member for a core of Fig. 6;

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

<Cover for core>

(First Embodiment)

The lid member 10 for cores shown in Figs. 1 to 4 has a lid body 11, an auxiliary lid member 12, and a connecting member 13. The cover member 10 for a core is attached to an axial end portion 33 of a cylindrical core 31 wound with a film 32 as shown in Figs. 5 (a) and 5 (b).

The cover body 11 is provided with a notch 14 extending in the axial direction (axial direction of the core 31 in the state of being attached to the core 31). The cover body 11 has a shape in which a part of the circle is cut out in a substantially square shape when viewed in the axial direction of the core 31 (as viewed from the front) (see Fig. The notched portion is the cutout portion 14 and the cover body 11 is opened at the cutout portion 14. [ And the auxiliary lid member 12 is formed so as to be fitted into the notch 14. 5 (b) can be inserted into the notch 14, which is an opening, when the core lid member 10 (lid body 11) is fitted into the core 31 Reference).

The lid body 11 includes a bottom portion 15 (first bottom portion), a wall portion 16 (first wall portion) formed upright from the outer edge of the bottom portion 15, And a flange portion 17 (first flange portion) extending outwardly from the edge. That is, the lid body 11 has a container shape with the bottom portion 15 as the bottom. The bottom portion 15 has a shape in which a part of the circle is cut out in a substantially square shape like the shape seen from the front face of the lid body 11. [ In other words, the lid body 11 may be also referred to as a shape in which a part of the side wall of the cylindrical container with the bottom is depressed. Since the lid body 11 has such a container shape as to be lightweight and excellent in gripping property, the workability of attaching the core 31 to the core 31 is improved. A plurality of protrusions (18) projecting outward are formed at substantially equal intervals in the circular arc portion of the wall portion (16).

The bottom portion 15, the wall portion 16 and the flange portion 17 of the lid body 11 are molded to have a substantially uniform thickness by a synthetic resin. The average thickness of the lid body 11 (the bottom 15, the wall 16 and the flange 17) is, for example, about 0.01 mm or more and about 3 mm or less. When the average thickness is equal to or more than the lower limit described above, shape retention is improved. On the other hand, when the average thickness is equal to or less than the upper limit, the elasticity is improved and the operability of fitting the auxiliary lid member 12 is improved.

The size of the lid body 11 is appropriately set according to the size of the core 31 to which the lid member 10 for the core is attached. That is, the outer diameter of the lid body 11 (bottom portion 15) is designed to be substantially the same as the inner diameter of the core 31. For example, the diameter when viewed from the front of the lid body 11 excluding the flange portion 17 may be 10 cm or more and 50 cm or less. 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 about 5 mm or more and 3 cm or less. By setting the width of the flange portion 17 to this size, it is possible to effectively prevent dust from entering the gap between the lid body 11 and the core 31, and the like. However, the width of the flange portion 17a in the cutout portion 14 may be, for example, 1 mm or more and 1 cm or less. Since the cutout portion 14 overlaps the flange portion 21 of the auxiliary lid member 12 as described later, the width of the flange portion 17a may be narrow.

The auxiliary lid member 12 has a substantially square shape in which one side is an arcuate shape when viewed from the front (when viewed in the axial direction of the core 31) (see Fig. The shape viewed from the front of the auxiliary lid member 12 is substantially the same as the shape seen from the front side of the cutout portion 14. [ 3, the shape of the lid body 11 and the auxiliary lid member 12 when the auxiliary lid member 12 is fitted into the cutout portion 14 of the lid body 11 has a shape When viewed, it becomes a circular shape. That is, the shape of the lid body 11 and the auxiliary lid member 12 when the auxiliary lid member 12 is fitted into the cutout portion 14 of the lid body 11 is the same as the shape of the end portion of the core 31 33). The entry of dust and the like into the core 31 can be suppressed by the cover member 10 for a core having the lid body 11 and the auxiliary lid member 12 having such a shape.

The auxiliary lid member 12 includes a bottom portion 19 (second bottom portion), a wall portion 20 (second wall portion) formed so as to protrude from the outer edge of the bottom portion 19, And a flange portion 21 (second flange portion) extending outward from the leading edge. That is, the auxiliary lid member 12 has a container shape with the bottom portion 19 as the bottom. Since the auxiliary lid member 12 has such a container shape, it is light in weight and excellent in gripping property, so that workability in fitting and removing in the cutout portion 14 is improved. The bottom portion 19 has a substantially square shape in which one side is an arcuate shape. A protrusion (22) protruding outward is formed in the arc portion of the wall portion (20).

The bottom portion 19, the wall portion 20 and the flange portion 21 of the auxiliary lid member 12 are also formed to have a substantially uniform thickness by a synthetic resin like the lid body 11. This average thickness can be made the same as that of the lid body 11.

The size of the auxiliary lid member 12 corresponds to the size of the cutout portion 14 and is set according to the diameter of the support bar 40 inserted into the core 31 and the like. The length of one side of the substantially square when viewed from the front of the auxiliary lid member 12 may be, for example, 3 cm or more and 15 cm or less. The length of one side of the substantially square when viewed from the front of the auxiliary lid member 12 is the same as the length of one side of the substantially square when viewed from the front side of the cutout 14. [ The height of the wall portion 20 of the auxiliary lid member 12 and the width of the flange portion 21 can be the same as those of the wall portion 16 and the flange portion 17 of the lid body 11. [ Since the flange portion 21 is formed on the entire periphery of the auxiliary lid member 12 as well, it is possible to suppress entry of dust and the like from the gap between the auxiliary lid member 12 and the core 31 and the lid body 11 .

The connecting member 13 is a sheet member having flexibility and connecting the lid body 11 and the auxiliary lid member 12. The connecting member 13 is formed by connecting the first band portion 23, the second band portion 24 and the third band portion 25 in an S shape. That is, the connecting member 13 is made of a sheet material having an S-shaped portion when viewed from the plane formed by the first band portion 23, the second band portion 24 and the third band portion 25 Reference). A hole 26a and a hole 26b are formed in the connecting portion of the first band portion 23 and the second band portion 24 and the connecting portion of the second band portion 24 and the third band portion 25, Is formed. The thickness of the connecting member 13 is not particularly limited and may be the same as that of the lid body 11 or the like.

The connecting member 13 connects the flange portion 17a at the bottom edge portion of the cutout portion 14 of the lid body 11 with the flange portion 21 of the auxiliary lid member 12. The first band portion 23 and the third band portion 25 are of the same length and are longer than the height of the wall portion 16 of the lid body 11 and the wall portion 20 of the auxiliary lid member 12 . The length of the second band portion (24) is shorter than the length of the first band portion (23) and the third band portion (25). When the auxiliary lid member 12 is fitted into the cutout portion 14 of the lid body 11, the connecting member 13 is not obstructed and is bent (collapsed) (See Figs. 4 and 5 (A)). When the auxiliary lid member 12 is detached from the cutout portion 14, the warpage of the linking member 13 is eliminated and the S-shaped portion is unfolded. Therefore, when the support rod 40 is inserted, The auxiliary lid member 12 is unlikely to be disturbed (see Fig. 5 (b)).

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

5 (a) and 5 (b), the cover member 10 for a core is provided with a lid 30 which is fitted in an axial end portion 33 of a conventional core 31 wound with a film 32, . It is possible to suppress entry of dust or the like into the core 31 by the cover member 10 for the core and to improve workability in using the support bar 40. [ In the following description of the film roll having the covering sheet 10 for the core, a detailed method of using the covering sheet 10 for the core will be described.

<Film roll>

The film roll 30 shown in Figs. 5 (a) and 5 (b) has a conventional core 31, a film 32 wound on the core 31, And a cover member (10) for a core attached to the core (33).

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 may be made of metal, synthetic resin, paper, or wood. It may also be a composite material of metal and synthetic resin, a composite material of metal and paper, a synthetic resin, and a composite material of paper. Of these, it is preferable to use a metal, a synthetic resin, or a combination thereof as a main component. Further, it is more preferable to use a metal as a main component because it is hardly affected by abrasion or the like even if it is repeatedly used. The main component means the component having the highest content. 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, and aluminum, and iron and aluminum are preferable in terms of strength, light weight, and the like. These may be used alone or in combination of two or more.

Examples of the synthetic resin include polyvinyl chloride, polyvinylidene chloride, polyester, polycarbonate, polyamide, epoxy resin, polyurethane, polyurea and silicone resin, and polyvinyl chloride is preferable . Also, from the viewpoint of strength and the like, fiber reinforced plastic (FRP) such as carbon fiber reinforced plastic is also preferable. These may be used alone or in combination of two or more.

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

The film 32 wound on the core 31 is not particularly limited and may be a resin film such as a polyvinyl alcohol (PVA) film, a triacetyl cellulose (TAC) film, a polyester film, a polyamide film or a norbornene resin film . Among these, the effects of the present invention are more conspicuous in the case of an optical film such as a PVA film or a TAC film, particularly a PVA film. This is because a PVA film is required to have high quality as a fabric or the like for producing a polarizing film.

As the PVA forming the PVA film, for example, those obtained by saponifying a polyvinyl ester obtained by polymerizing a vinyl ester such as vinyl acetate can be used. In addition to PVA, additives such as plasticizers, surfactants, and colorants may be contained in the PVA film as necessary.

The length of the film 32 is not particularly limited, but the lower limit is preferably 1,000 m, more preferably 2,000 m, still more preferably 5,000 m, and particularly preferably 8,000 m. As the length is equal to or more than the lower limit described above, it is possible to suppress the increase in the ratio of the loss generated to the entire region at the start of winding or at the end of winding, and the workability is also improved. On the other hand, the upper limit of the length of the film 32 is preferably 20,000 m, more preferably 15,000 m, and even more preferably 10,000 m. Since the length is equal to or less than the upper limit, the mass or diameter of the film roll 30 can be prevented from becoming excessively large, and loading and unloading to the processing apparatus and handling during moving can be improved.

The width of the film 32 is not particularly limited, but the lower limit is preferably 2 m, more preferably 2.1 m, further preferably 3 m, and particularly preferably 3.3 m. When the width of the film 32 is equal to or more than the above-mentioned lower limit, a larger-area optical film (such as a polarizing film) 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 upper limit, the handling property and the like are improved.

The average thickness of the film 32 varies depending on the materials and applications, but may be, for example, from 5 占 퐉 to 500 占 퐉. The entire thickness of the film 32 in the state in which the film 32 is wound may 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 flexible 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 cover member 10 for the core is fitted in the end portion 33 of the core 31. The cover member 10 for a core is attached to both ends of the core 31, respectively. Since the cover member 10 for a core is the same as that of the cover member 10 for cores shown in Figs. 1 to 4, the same reference numerals are attached thereto, and a detailed description thereof will be omitted. The lid body 11 is fitted in the core 31 so that the notch portion 14 is on the upper side. The auxiliary lid member 12 of the lid member 10 for a core is fitted in the notch portion 14 of the lid body 11 in a state in which the connecting member 13 is warped. The flange portion 17 and the flange portion 21 of the core lid member 10 are not fitted in the core 31 but are in contact with the end face 34 of the core 31. As described above, since the opening of the end portion 33 of the core 31 is closed by the lid body 11 and the auxiliary lid member 12, entry of dust or the like into the core 31 can be suppressed.

Although not shown, the film 32 is covered with a packaging material in order to prevent the attachment of dust or the like when transporting and storing the film roll 30 or the like. When the end portion of the packaging material covering the film 32 is pushed into the core 31, the cover material 10 for the core is inserted into the end portion 33 of the core 31 so as to press the packaging material You can also put it.

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 monolayer 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 deposited layer, a laminated film of a resin layer and a metal foil, and specifically, a laminated film of aluminum deposited on polyethylene terephthalate, A laminated film of a polyester and an aluminum foil and a polyethylene, a laminated film of an aluminum evaporated polyester and a polyethylene, a laminated film of an alumina deposited polyester and a polyethylene, a laminated film of a glass evaporated polyester and a polyethylene, a polyvinylidene chloride coat, And the like. One kind of packaging material may be used alone, but two or more kinds of packaging materials may be used in combination.

5 (b), when the film roll 30 is transported using the support bar 40, the core lid member 10 is inserted into the core 31, (12) to the outside. The support rod 40 can be inserted into the notch 14 by detaching the auxiliary lid member 12. The auxiliary lid member 12 does not interfere with the insertion of the support rod 40 because the connecting member 13 having an S shape can be extended when the auxiliary lid member 12 is removed. In addition, after the operation of using the support bar 40, the auxiliary lid member 12 is fitted into the notch portion 14, so that entry of dust or the like is suppressed. In addition, even when the support rod 40 is used, since the cutout portion 14 is the only opening through which dust or the like can enter, entry of dust or the like is minimized.

<Cover for core>

(Second Embodiment)

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

In the lid body 51, a notch 54 penetrating in the axial direction of the core in the state of being attached to the core is formed on the outer edge. The lid body 51 includes a bottom portion 55 and a wall portion (not shown) formed upright from the outer edge of the bottom portion 55 and a flange portion (not shown) extending outwardly from the leading edge of the wall portion 57).

The auxiliary lid member 52 has a substantially square shape in which one side is an arcuate shape when viewed from the front (when viewed in the axial direction of the core in a state of being attached to the core). 7, the shape formed by the lid body 51 and the auxiliary lid member 52 when the auxiliary lid member 52 is fitted into the cutout portion 54 of the lid body 51 is a shape When viewed, it becomes a circular shape. That is, the shape formed by the lid body 51 and the auxiliary lid member 52 when the auxiliary lid member 52 is fitted into the cutout portion 54 of the lid body 51 is a shape in which the opening of the end portion of the core is closed Shape. The auxiliary lid member 52 includes a bottom portion 59 and a wall portion (not shown) formed upright from the outer edge of the bottom portion 59 and a flange portion 61 extending outwardly from the leading edge of the wall portion ).

The connecting member 53 is a sheet member having flexibility and connecting the lid body 51 and the auxiliary lid member 52. [ The connecting member 53 has an S-shaped portion when viewed from the top, and specifically has a shape in which five band portions are connected alternately. The connecting member 53 connects the flange portion 57 of the lid body 51 with the flange portion 61 of the auxiliary member 52. [ In the flange portion 57 of the lid body 51, however, the connecting member 53 is connected to the flange portion 57 at a portion other than the cutout portion 54.

Even in this core cover member 50, when the auxiliary cover member 52 is fitted into the cutout portion 54 of the lid body 51, since the connection member 53 is bent without being disturbed, (See Fig. 7). In the state where the auxiliary lid member 52 is removed from the cutout 54, since the warpage of the linking member 53 is eliminated and the S-shaped portion is unfolded, The auxiliary lid member 52 is unlikely to interfere. Particularly, in the core lid member 50, since the connecting member 53 is connected to the flange portion 57 at a position different from the notch portion 54 of the lid body 51, , It is sufficiently reduced that the auxiliary lid member 52 and the connecting member 53 interfere with the insertion of the support rods.

&Lt; Other Embodiments &gt;

The lid material and the film roll for the core of the present invention are not limited to the above embodiments. The connecting member may be, for example, in the shape of a straight line (strip) or an L-like shape. Even such a shape serves as a connecting member. Further, for example, when the connecting member is formed into a strip-like shape having a sufficient length, the connecting member is bent when the auxiliary lid member is inserted into the notch portion. Even in such a case, when the auxiliary lid material is removed from the cutout portion, the bending of the linking member is eliminated and the auxiliary lid material can be moved to a position away from the cutout portion, so that the support rod can be easily inserted .

In the above-described embodiment, the cover member for the core has a structure to be fitted in the core, but it may be structured to cover the entire end surface of the core. Further, the lid body, the auxiliary lid member and the connecting member may be made of different materials. The cover member for a core is not limited to a synthetic resin, and may be formed of, for example, metal, paper, paper, or a composite member thereof. The core to which the cover member for a core is attached is not limited to a cylindrical shape in general, and may be, for example, an ordinary one. The effect of the present invention can be exhibited by making the cover material for the core to have a shape corresponding to the shape of the end portion of the core.

Industrial availability

The cover member for a core of the present invention can suppress entry of dust and the like into the core of the film roll and is also excellent in workability when transporting using a support bar. Therefore, the film for optical films such as PVA film It can be preferably used as a cover material of a core of a roll.

10, 50: core cover material
11, 51: lid body
12, 52: Auxiliary cover material
13, 53: connecting member
14, 54:
15, 55:
16: wall portion
17, 17a, 57: flange portion
18: projection
19, 59: bottom part
20: wall portion
21, 61: flange portion
22: projection
23:
24:
25: Third band
26a and 26b:
30: Film roll
31: Core
32: Film
33: end of core
34: Cross section of core
40:

Claims (7)

A lid material for a core for attaching to an axial end portion of a conventional core in which a film is wound,
A cover main body having a cutout portion penetrating in the axial direction formed on the outer edge,
An auxiliary lid member fitted into the notch portion, and
And a connecting member having flexibility and connecting the cover body and the auxiliary lid member,
Wherein a shape formed by the lid body and the auxiliary lid member when the auxiliary lid material is fitted in the notch portion of the lid body is a shape for blocking the opening of the end portion of the core. The method according to claim 1,
A cover member for a core formed integrally with a synthetic resin. 3. The method according to claim 1 or 2,
And the auxiliary lid material is fitted in the notch portion in a state in which the connecting member is bent. The method according to claim 1, 2, or 3,
Wherein the connecting member is made of a sheet material having an S-shaped portion when viewed in a plan view. 5. The method according to any one of claims 1 to 4,
Wherein the lid body has a first bottom portion, a first wall portion formed upright from an outer edge of the first bottom portion, and a first flange portion extending outwardly from a leading edge of the first wall portion,
Wherein the auxiliary lid material has a second wall portion formed so as to be erected from a second bottom portion and an outer edge of the second bottom portion and a second flange portion extending outward from a leading edge of the second wall portion. 6. The method of claim 5,
And the connecting member connects the first flange portion and the second flange portion. A conventional core,
A film wound on the core,
The film roll as set forth in any one of claims 1 to 6, which is attached to an axial end portion of the core.

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