JP6498297B2 - Core lid and film roll - Google Patents

Description

  The present invention relates to a core lid and a film roll.

  A long film is usually transported and stored as a film roll wound around a cylindrical core. Specifically, for example, a polyvinyl alcohol (PVA) film used as a raw material for manufacturing a polarizing film, a triacetyl cellulose (TAC) film used to protect the polarizing film, etc. are transported as a film roll. , Stored etc.

  Optical films such as the PVA film and TAC film are required to have particularly high accuracy, and the presence of dust, moisture, etc. adhering to the surface affects the quality. For example, a PVA film has high hygroscopicity, and wrinkles and sagging occur due to contact with moisture. Such a defect expresses the non-uniformity of the polarizing property of the polarizing film. Moreover, foreign matters such as dust adhered to the surface of the PVA film may cause optical defects in the obtained polarizing film. Therefore, at the time of transportation and storage, the film roll is sufficiently packaged and stored in a clean room or the like. However, when the film roll is transported or the like, the support rod is often inserted into the cylindrical core and transported via the support rod, so that the end of the core may not be covered in some cases. In this case, since the end of the core is exposed, dust or the like may enter the core or condensation may occur. Dust and the like accumulated in the core are released from the core due to vibration during film roll conveyance, etc., and come into contact with the film, thereby deteriorating the quality of the film.

  Here, in order to prevent the entry of dust or the like into the core of the film roll, a film packing cap that fits into the core has also been developed (see JP 2000-142616 A). However, when such a cap is attached, it is necessary to remove the cap when inserting the support rod into the core as described above, and workability is poor.

JP 2000-142616 A

  The present invention has been made based on the circumstances as described above, and its purpose is to suppress the entry of dust and the like into the core of the film roll, and at the time of conveyance using a support rod, etc. It is providing the core cover material which is excellent also in workability | operativity, and a film roll provided with the same.

  The invention made in order to solve the above-mentioned problems is a core cover material for attaching to an end portion in the axial direction of a cylindrical core around which a film is wound, and a cutout portion penetrating in the axial direction is formed on an outer edge. A lid body formed, an auxiliary lid material fitted into the notch, and a connecting member that has flexibility and connects the lid body and the auxiliary lid material, the auxiliary lid material being the lid body The shape formed by the lid body and the auxiliary lid material when fitted into the notch is a shape that closes the opening at the end of the core.

  According to the core lid material, the opening of the core end portion is closed with the lid body and the auxiliary lid material by attaching the auxiliary lid material to the notch portion of the lid body and attaching the auxiliary lid material to the core end portion. And entry of dust or the like into the core can be suppressed. Moreover, according to the said cover material for cores, in the state attached to the core edge part, an auxiliary | assistant cover material can be removed from the notch part of a cover main body. Therefore, when transporting using a support rod, etc., the auxiliary lid can be removed and the support rod can be inserted into the core from the notch, and the auxiliary lid can be easily fitted again after the work is completed. Also, workability is excellent. In addition, since the lid main body remains attached during the work using the support rod, it is possible to suppress the entry of dust or the like into the core.

  It is preferable that the core lid member is integrally formed of a synthetic resin. Since the core lid material is integrally formed of synthetic resin, workability and the like due to the weight reduction of the core lid material can be improved, and production and the like can be performed at low cost.

  It is preferable that the auxiliary lid member is fitted into the notch in a state where the connecting member is bent. In such a case, when the auxiliary lid member is removed from the notch, the bending of the connecting member is eliminated, and the auxiliary lid member is separated from the notch, so that the auxiliary lid member is obstructed when the support rod is inserted. It is hard to become. That is, by doing in this way, workability | operativity, a handleability, etc. can be improved.

  The connecting member is preferably made of a sheet material having an S-shaped portion in plan view. Since the connecting member has such a shape, in a state where the auxiliary lid member is fitted into the notch portion of the lid body, the connecting member can be folded, so that the auxiliary lid member can be fitted. It can be done easily. Further, in a state where the auxiliary lid member is removed from the notch portion, the auxiliary lid member can be extended at the S-shaped portion of the connecting member, so that the auxiliary lid member is unlikely to become an obstacle when the support bar is inserted. That is, when the connecting member has such a shape, workability, handleability, and the like can be improved.

  The lid body has a first bottom portion, a first wall portion erected from the outer edge of the first bottom portion, and a first flange portion extending outward from the tip edge of the first wall portion, The auxiliary lid member has a second bottom portion, a second wall portion erected from the outer edge of the second bottom portion, and a second flange portion extending outward from the tip edge of the second wall portion. Is preferred. When the lid body and the auxiliary lid material have such shapes, workability due to ease of holding and the like is enhanced. Further, the presence of the flange portion can suppress entry of dust and the like from the gap portion.

  It is preferable that the connecting member connects the first flange portion and the second flange portion. Thus, when the connection member has connected the 1st flange part and the 2nd flange part, it becomes easy to remove an auxiliary | assistant cover material to the near side (flange part side), and workability | operativity etc. can be improved more.

  Another invention made to solve the above-mentioned problems is a film comprising a cylindrical core, a film wound around the core, and the core lid member attached to the axial end of the core. It is a roll.

  The film roll has the above-described core lid attached to the end of the core, so that entry of dust and the like into the core can be suppressed, and workability during transport using a support rod, etc. Also excellent.

  ADVANTAGE OF THE INVENTION According to this invention, the core lid | cover material which can suppress entry of dust etc. in the core of a film roll, and is excellent also in the workability | operativity at the time of conveyance using a support rod, and a film provided with this A roll can be provided.

FIG. 1 is a front view of a core lid member according to an embodiment of the present invention. FIG. 2 is a perspective view of the core lid member of FIG. FIG. 3 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 core lid member of FIG. 1. FIG. 4 is a side view showing a state in which the auxiliary lid material is fitted into the notch portion of the lid body in the core lid material of FIG. 1. Fig.5 (a) is explanatory drawing which shows the 1st use condition of the film roll which concerns on one Embodiment of this invention. FIG.5 (b) is explanatory drawing which shows the 2nd use condition of the film roll of FIG.5 (b). FIG. 6 is a front view of a core lid material different from the core lid material of FIG. 1. FIG. 7 is a front view showing a state in which the auxiliary lid material is fitted into the notch portion of the lid body in the core lid material of FIG. 6.

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

<Cover for core>
(First embodiment)
The core lid member 10 of FIGS. 1 to 4 includes a lid body 11, an auxiliary lid member 12, and a connecting member 13. As shown in FIGS. 5A and 5B, the core lid member 10 is attached to the axial end portion 33 of the cylindrical core 31 around which the film 32 is wound.

  The lid body 11 has a notch 14 formed in the outer edge that penetrates in the axial direction (the axial direction of the core 31 when attached to the core 31). The lid body 11 has a shape in which a part of a circle is cut out into a substantially square shape when the core 31 is viewed in the axial direction (front view) (see FIG. 1 and the like). The notched portion is the notched portion 14, and the lid main body 11 is open at the notched portion 14. The auxiliary lid member 12 is formed so as to be fitted into the notch 14. Further, when the core lid member 10 (lid body 11) is fitted into the core 31, the support bar 40 can be inserted into the cutout portion 14 serving as an opening (see FIG. 5B).

  The lid body 11 includes a bottom portion 15 (first bottom portion), a wall portion 16 (first wall portion) erected from the outer edge of the bottom portion 15, and a flange portion extending outward from the tip edge of the wall portion 16. 17 (first flange portion). That is, the lid body 11 has a container shape with the bottom 15 as the bottom. The bottom portion 15 has a shape in which a part of a circle is cut out into a substantially square shape, similar to the front view shape of the lid body 11. That is, the lid body 11 can also be said to be a shape in which a part of the side wall of the bottomed cylindrical container is recessed. Since the lid body 11 has such a container shape, the weight is reduced and the gripping property is excellent, so that the workability of attaching to the core 31 is improved. A plurality of protrusions 18 protruding outward are provided at substantially equal intervals on the arc portion of the wall portion 16.

  The bottom part 15, the wall part 16, and the flange part 17 of the lid main body 11 are formed with a substantially uniform thickness from a synthetic resin. The average thickness of the lid 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 equal to or more than the above lower limit, shape maintainability is improved. On the other hand, when the average thickness is not more than the above upper limit, the elasticity is improved and the workability of fitting the auxiliary lid 12 is improved.

  The size of the lid body 11 is appropriately set according to the size of the core 31 to which the core lid member 10 is attached. In other words, the outer diameter of the lid body 11 (bottom 15) is designed to be substantially equal to the inner diameter of the core 31. For example, the diameter of the lid body 11 excluding the flange portion 17 in a front view can be 10 cm or more and 50 cm or less. Moreover, as the height of the wall part 16, it is about 3 cm or more and 10 cm or less, for example. 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 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 set to 1 mm or more and 1 cm or less, for example. Since the cutout portion 14 overlaps with the flange portion 21 of the auxiliary lid member 12 as will be described later, the width of the flange portion 17a may be narrow.

  The auxiliary lid member 12 has a substantially square shape whose one side is an arc shape when viewed from the front (viewed in the axial direction of the core 31) (see FIG. 1 and the like). The front view shape of the auxiliary lid member 12 is substantially the same as the front view shape of the notch 14. As shown in FIG. 3 and the like, the shape formed by the lid body 11 and the auxiliary lid member 12 when the auxiliary lid member 12 is fitted into the notch portion 14 of the lid body 11 is circular when viewed from the front. That is, the shape formed by the lid body 11 and the auxiliary lid member 12 when the auxiliary lid member 12 is fitted into the notch portion 14 of the lid body 11 is a shape that blocks the opening of the end portion 33 of the core 31. With the core lid member 10 having the lid body 11 and the auxiliary lid member 12 having such a shape, entry of dust or the like into the core 31 can be suppressed.

  The auxiliary lid 12 includes a bottom portion 19 (second bottom portion), a wall portion 20 (second wall portion) erected from the outer edge of the bottom portion 19, and a flange extending outward from the tip edge of the wall portion 20. Part 21 (second flange part). That is, the auxiliary lid 12 has a container shape with the bottom 19 as the bottom. Since the auxiliary lid member 12 has such a container shape, the weight is reduced and the gripping property is excellent, so that the workability of fitting into and removing from the notch portion 14 is improved. The bottom portion 19 has a substantially square shape with one side having an arc shape. The arc portion of the wall portion 20 is provided with a protrusion 22 protruding outward.

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

  The size of the auxiliary lid 12 corresponds to the size of the notch 14 and is set according to the diameter of the support bar 40 inserted into the core 31. The length of one side of the substantially square in the front view of the auxiliary lid member 12 can be, for example, 3 cm or more and 15 cm or less. The length of one side of the substantially square in the front view of the auxiliary lid member 12 is the same as the length of one side of the substantially square in the front view of the notch portion 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 auxiliary lid member 12 is also provided with the flange portion 21 on the entire circumference, entry of dust and the like from the gap between the auxiliary lid member 12 and the core 31 and the lid body 11 can be suppressed.

  The connecting member 13 is a sheet material that has flexibility and connects the lid main body 11 and the auxiliary lid member 12. The connecting member 13 is formed by connecting a first belt portion 23, a second belt portion 24, and a third belt portion 25 in an S shape. That is, the connecting member 13 is made of a sheet material having an S-shaped portion in plan view formed from the first belt portion 23, the second belt portion 24, and the third belt portion 25 (see FIG. 1 and the like). In addition, the hole part 26a and the hole part 26b are formed in the connection part of the 1st belt | band | zone part 23 and the 2nd belt | band | zone part 24, and the connection part of the 2nd belt | band | zone part 24 and the 3rd belt | band | zone part 25, respectively. . The thickness of the connecting member 13 is not particularly limited, and can be the same as that of the lid body 11 or the like.

  The connecting member 13 connects the flange portion 17 a in the bottom portion of the notch portion 14 of the lid body 11 and the flange portion 21 of the auxiliary lid member 12. Moreover, the 1st belt | band | zone part 23 and the 3rd belt | band | zone part 25 are the same length, and are comprised longer than the height of the wall part 16 of the cover main body 11, and the wall part 20 of the auxiliary | assistant cover material 12. FIG. 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. Due to such a structure, when the auxiliary lid member 12 is fitted into the notch portion 14 of the lid body 11, the connecting member 13 bends (folds) without being obstructed, so that fitting is easy. (See FIGS. 4 and 5A). Further, in a state where the auxiliary lid member 12 is removed from the notch portion 14, the bending of the connecting member 13 is eliminated and the S-shaped portion is extended. Therefore, the auxiliary lid member is inserted when the support bar 40 is inserted or in the inserted state. 12 does not easily get in the way (see FIG. 5B).

  In the core lid member 10, the lid body 11, the auxiliary lid member 12, and the connecting member 13 are preferably integrally formed of synthetic resin. Since the core lid member 10 is integrally formed of synthetic resin, workability and the like due to the weight reduction of the core lid member 10 can be improved, and production at a low cost can be achieved. The synthetic resin that forms the core lid member 10 is not particularly limited, and examples thereof include thermoplastic resins such as polyolefin, polystyrene, polyvinyl chloride, and acrylic resin. The said core cover material 10 can be shape | molded by well-known shaping | molding methods, such as injection molding using such a synthetic resin.

  As shown in FIGS. 5A and 5B, the core lid member 10 is used as a lid that is fitted into the axial end portion 33 of the cylindrical core 31 around which the film 32 is wound. The core lid member 10 can suppress entry of dust or the like into the core 31 and can improve workability when the support bar 40 is used. In the following description of the film roll including the core lid member 10, a detailed method of using the core lid member 10 will be described.

<Film roll>
5 (a) and 5 (b) includes a cylindrical core 31, a film 32 wound around the core 31, and a core lid attached to an end 33 in the axial direction of the core 31. The material 10 is provided.

  The core 31 is a cylindrical body having substantially rigidity. 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. 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 these, those containing a metal, a synthetic resin, or a combination thereof as a main component are preferable. In addition, a metal-based material is more preferable because it is not easily affected by wear or the like even when used repeatedly. In addition, a main component means a component with most content rate. As a minimum of the content rate of the metal in the core 31, and a synthetic resin, 50 mass% is preferable, 80 mass% is more preferable, 95 mass% is further more preferable, 99.9 mass% is especially preferable.

  As said metal, iron, stainless steel, aluminum etc. are mentioned, for example, and iron and aluminum are preferable from points, such as intensity | strength and lightweight property. These can use 1 type (s) or 2 or more types.

  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. From the viewpoint of strength, fiber reinforced plastic (FRP) such as carbon fiber reinforced plastic is also preferable. These can use 1 type (s) or 2 or more types.

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

  There is no restriction | limiting in particular in the film 32 wound around the core 31, Resin films, such as a polyvinyl alcohol (PVA) film, a triacetyl cellulose (TAC) film, a polyester film, a polyamide film, a norbornene-type resin film, can be mentioned. Among these, when the film is an optical film such as a PVA film or a TAC film, particularly a PVA film, the effects of the present invention are more remarkably exhibited. This is because the PVA film is required to have high quality as a raw material for producing a polarizing film.

  As the PVA that forms the PVA film, for example, one obtained by saponifying a polyvinyl ester obtained by polymerizing a vinyl ester such as vinyl acetate can be used. In addition to PVA, the PVA film may contain additives such as a plasticizer, a surfactant, and a colorant 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. When the length is equal to or greater than the above lower limit, it is possible to suppress an increase in the ratio of the loss generated at the beginning and end of winding to the whole, and workability is also improved. On the other hand, the upper limit of the length of the film 32 is preferably, for example, 20,000 m, more preferably 15,000 m, and further preferably 10,000 m. When the length is equal to or less than the above upper limit, it is possible to suppress the mass and diameter of the film roll 30 from being excessive, and the handling property at the time of loading and unloading to a gantry and a processing apparatus and movement is improved.

  Although the width | variety of the film 32 is not specifically limited, As a minimum, 2m is preferable, 2.1m is more preferable, 3m is further more preferable, 3.3m is especially preferable. When the width of the film 32 is equal to or greater than the above 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, and more preferably 8 m. When the width of the film 32 is not more than the above upper limit, the handleability and the like are improved.

  The average thickness of the film 32 may be, for example, not less than 5 μm and not more than 500 μm, depending on the material and application. The thickness of the entire layer of the film 32 in a state where 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 casting film forming method, a wet film forming method, a dry film forming method, a gel film forming method, or a melt extrusion film forming method.

  The core lid 10 is fitted into the end 33 of the core 31. The core lid member 10 is attached to both ends of the core 31. Since the core lid member 10 is the same as the core lid member 10 shown in FIGS. 1 to 4, the same reference numerals are given and detailed description thereof is omitted. The lid body 11 is fitted into the core 31 so that the cutout portion 14 is on the upper side. The auxiliary lid member 12 of the core lid member 10 is fitted into the notch portion 14 of the lid body 11 with the connecting member 13 being bent. Further, the flange portion 17 and the flange portion 21 in the core lid member 10 are not fitted into the core 31 and are in contact with the end surface 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 main body 11 and the auxiliary lid member 12, entry of dust or the like into the core 31 can be suppressed.

  Although not shown in the drawings, the film 32 is covered with a packaging material in order to prevent dust from adhering when the film roll 30 is transported and stored. When the end portion of the packaging material covering such a film 32 is pushed into the core 31, the core lid 10 can be fitted into the end portion 33 of the core 31 so as to hold down the packaging material.

  The packaging material is not particularly limited, and is usually a film (sheet), may be a single layer film, or may be 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, and a laminated film of a resin layer and a metal foil. Specifically, aluminum is vapor-deposited on polyethylene terephthalate. Laminated film, laminated film of polyester, aluminum foil and polyethylene, laminated film of aluminum deposited polyester and polyethylene, laminated film of alumina deposited polyester and polyethylene, laminated film of glass deposited polyester and polyethylene, polyvinylidene chloride coating A laminated film of polypropylene and polyethylene can be exemplified. One type of packaging material can be used alone, or two or more types can be used in combination.

  As shown in FIG. 5B, when the film roll 30 is transported using the support rod 40, the auxiliary lid 12 is removed to the outside while the core lid 10 is fitted into the core 31. Can do. By removing the auxiliary lid member 12, the support bar 40 can be inserted into the notch portion 14. When the auxiliary lid 12 is removed, the connecting member 13 having an S-shape can be extended, so that the auxiliary lid 12 does not get in the way when the support bar 40 is inserted. In addition, after the work using the support bar 40, the auxiliary lid member 12 is fitted into the cutout portion 14 again, thereby suppressing the entry of dust and the like. In addition, when working with the support bar 40, the opening through which dust and the like can enter is only the cutout portion 14, so that the entry of dust and the like can be minimized.

<Cover for core>
(Second Embodiment)
The core lid member 50 shown in FIGS. 6 and 7 includes a lid body 51, an auxiliary lid member 52, and a connecting member 53. The core lid member 50 is also attached to the axial end of the core around which the film is wound in order to prevent dust and the like from entering the core. The core lid member 50 has a shape similar to that of the core lid member 10 shown in FIG. 1, but the position and shape of the connecting member 53 are particularly different from those of the connecting member 13 shown in FIG. The material and size of the core lid member 50 are the same as those of the core lid member 10 shown in FIG.

  The lid body 51 is formed with a notch 54 penetrating in the axial direction of the core in a state attached to the core at the outer edge. The lid main body 51 has a bottom portion 55, a wall portion (not shown) standing from the outer edge of the bottom portion 55, and a flange portion 57 extending outward from the tip edge of the wall portion.

  The auxiliary lid member 52 has a substantially square shape with one side having an arc shape when viewed from the front (viewed in the axial direction of the core in a state of being attached to the core). As shown in FIG. 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 notch 54 of the lid body 51 is circular when viewed from the front. 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 notch 54 of the lid body 51 is a shape that closes the opening at the end of the core. The auxiliary lid member 52 has a bottom portion 59, a wall portion (not shown) standing from the outer edge of the bottom portion 59, and a flange portion 61 extending outward from the tip edge of the wall portion.

  The connecting member 53 is a sheet material that has flexibility and connects the lid main body 51 and the auxiliary lid 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 connected. The connecting member 53 connects the flange portion 57 of the lid main body 51 and the flange portion 61 of the auxiliary lid member 52. However, in the flange part 57 of the lid body 51, the connecting member 53 is connected to the flange part 57 other than the notch part 54.

  Also in the core lid member 50, when the auxiliary lid member 52 is fitted into the notch portion 54 of the lid body 51, the connecting member 53 bends without being obstructed, so that the fitting can be easily performed (FIG. 7). In addition, in a state where the auxiliary lid member 52 is removed from the notch portion 54, the bending of the connecting member 53 is eliminated and the S-shaped portion extends, so that the auxiliary lid member 52 is inserted when the support bar is inserted or in the inserted state. Is hard to get in the way. In particular, in the core lid member 50, since the connecting member 53 is coupled to the flange portion 57 at a position different from the notch portion 54 of the lid body 51, the auxiliary lid member is inserted when the support bar is inserted. It is sufficiently reduced that 52 and the connecting member 53 prevent the support rod from being inserted.

<Other embodiments>
The core lid member and film roll of the present invention are not limited to the above embodiment. As a connection member, the thing of shapes, such as linear (strip | belt shape) and L shape, may be sufficient, for example. Even such a shape functions as a connecting member. Further, for example, when the connecting member has a sufficiently long band shape, the connecting member is bent when the auxiliary lid member is fitted into the notch. Even in such a case, when the auxiliary lid is removed from the notch, the bending of the connecting member is eliminated, and the auxiliary lid can be moved to a position away from the notch, so that the support rod can be easily inserted. It can be carried out.

  Moreover, in the said embodiment, although the cover material for cores is set as the structure fitted in a core, the structure which covers the whole edge part of a core may be sufficient. Further, the lid body, the auxiliary lid member, and the connecting member may be made of different materials. Furthermore, the core cover material is not limited to being made of synthetic resin, and may be formed of, for example, metal, cloth, paper, or a composite member thereof. The core to which the core lid member is attached is not limited to a cylindrical shape as long as it is cylindrical, and may be, for example, a rectangular tube. The core lid member can achieve the effects of the present invention by having a shape corresponding to the shape of the end of the core.

  The core lid material of the present invention can suppress the entry of dust and the like into the core of the film roll, and is excellent in workability at the time of transport using a support rod. It can be suitably used as a cover material for the core of a film roll of a film for use.

10, 50 Core lid 11, 51 Lid body 12, 52 Auxiliary lid 13, 53 Connecting member 14, 54 Notch 15, 55 Bottom 16 Wall 17, 17a, 57 Flange 18 Protrusion 19, 59 Bottom 20 Wall part 21, 61 Flange part 22 Protrusion 23 1st belt part 24 2nd belt part 25 3rd belt part 26a, 26b Hole part 30 Film roll 31 Core 32 Film 33 End part of core 34 End face of core 40 Support rod

Claims (7)

A core lid for attaching to an axial end of a cylindrical core around which a film is wound,
A lid body in which a cutout portion penetrating in the axial direction is formed on an outer edge in the axial direction view ;
An auxiliary lid member fitted into the notch, and a connecting member that has flexibility and connects the lid body and the auxiliary lid member;
For the core, wherein the shape formed by the lid body and the auxiliary lid material when the auxiliary lid material is fitted into the notch portion of the lid body is a shape that closes the opening at the end of the core Lid material.   The core cover material according to claim 1, wherein the core cover material is integrally formed of a synthetic resin.   The core cover material according to claim 1 or 2, wherein the auxiliary cover material is fitted into the notch portion in a state where the connecting member is bent.   The core cover material according to claim 1, wherein the connecting member is made of a sheet material having an S-shaped portion in plan view. The lid body has a first bottom portion, a first wall portion erected from the outer edge of the first bottom portion, and a first flange portion extending outward from the tip edge of the first wall portion,
The auxiliary lid member has a second bottom portion, a second wall portion erected from an outer edge of the second bottom portion, and a second flange portion extending outward from a tip edge of the second wall portion. The core lid member according to any one of claims 1 to 4.   The core lid member according to claim 5, wherein the connecting member connects the first flange portion and the second flange portion. A cylindrical core,
A film wrapped around this core,
A film roll comprising: the core lid material according to any one of claims 1 to 6, which is attached to an end portion in the axial direction of the core.

Images