JP2011144042A - Winding core tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a winding core tube enabled to be installed in a shaft without being eccentric relative to a turning axis of the shaft of a machine. <P>SOLUTION: This winding core tube 1 includes: a core tube body 2 formed into a nearly cylindrical shape; and an elastic member 3 provided in an opening end part 2a of the core tube body 2. The elastic member is installed in the core tube body freely to turn integrally with the core tube body. This winding core tube is characterized by including the core tube body formed into a nearly cylindrical shape and the elastic part integrally formed with the inner peripheral surface of the core tube body. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention is used, for example, for winding a long sheet material used for a packaging material for packaging an article to be packaged such as food or daily necessities, or for feeding out a long sheet material wound as an original packaging material. It is related with the core tube for winding used for.

  Conventionally, in order to wrap packages such as foods and daily necessities, a wrapping material is wrapped around a paper tube (core tube for wrapping wrapping material) that is formed in a substantially cylindrical shape by laminating multiple layers of paper. There are various types.

  As shown in FIGS. 5 (a) and 5 (b), the original packaging material is provided in the packaging machine by a holding member 4 that detachably holds both open ends 500a and 500a 'of the paper tube 500. It is attached to. The holding member 4 is attached to the shaft 5 so as to be rotatable in conjunction with the rotation of the shaft 5 of the packaging machine. The holding member 4 is fixed to a fixed holding member 41,... Capable of holding one open end 500a of the paper tube 500 so as to face the one open end 500a, and the other open end 500a ′ is detachable. The paper tube 500 is held on the shaft 5 by being fixed to the movable holding members 42... The packaging machine is designed so that the packaging material is sequentially delivered from the original packaging material by rotating the shaft 5 while holding the both ends of the paper tube 500 on the shaft 5.

  When printing is performed on the surface of the packaging material of the packaging material, the printing machine attaches the paper tube 500 to the shaft 5, attaches one end of the printed packaging material to the paper tube 500, and the shaft 5 It is also designed to wrap a printed packaging material by rotating (see Patent Document 1).

  The paper tube 500 attached to the packaging machine causes the fixed holding members 41 of the holding member 4 and the movable holding members 42 to bite the inner peripheral surfaces 500b and 500b 'closest to the opening end portions 500a and 500a'. Thus, it is provided so as to rotate integrally with the shaft 5 without idling with respect to the shaft 5.

JP 2009-83912 A

  However, since the paper tube 500 is formed in a substantially cylindrical shape by laminating paper, the hardness varies depending on the location of the inner peripheral surfaces 500b and 500b '. The fixed holding members 41,... And the movable holding members 42,... Can be deeply penetrated into the inner peripheral surfaces 500b, 500b ′ having a low hardness, but shallow on the inner peripheral surfaces 500b, 500b ′ having a high hardness. You can only bite. .. And the movable holding members 42... Bite into the inner peripheral surfaces 500 b and 500 b ′ of the paper tube 500 in a non-uniform manner, so that the rotation axis (center axis) of the shaft 5 and the paper tube 500. The rotation axis (center axis) of is eccentric. If the rotation axis of the shaft 5 and the paper tube 500 is eccentric, the speed of the packaging material that is fed out from the original packaging material or wound around the paper tube 500 is not constant, and excessive tension is applied to the packaging material, The packaging material is loose. A packaged item packaged in such a situation may cause problems such as damage to the packaging material or wrinkles.

  This invention makes it a subject to provide the core tube for winding which can be mounted | worn with a shaft so that it may not decenter with respect to the rotating shaft of the shaft of a machine in view of this situation.

  A winding core tube according to the present invention includes a core tube main body formed in a substantially cylindrical shape, and an elastic member provided at an opening end of the core tube main body. According to such a configuration, the winding core tube is in close contact with the shaft by elastically deforming the inner peripheral surface of the elastic member in accordance with the shape of the contact surface of the shaft. At this time, since the elastic member is elastically deformed substantially uniformly with respect to the contact surface of the shaft, the core tube main body can be mounted so as not to be eccentric with respect to the rotating shaft of the shaft of the machine.

  Further, the winding core tube according to the present invention is preferably attached to the core tube main body so that the elastic member can rotate integrally with the core tube main body. According to this configuration, the core tube main body can be prevented from spinning around from the elastic member that rotates while being held by the shaft, and the long sheet material wound around the core tube main body is fed out at the rotation speed of the elastic member. In addition, the long sheet material can be wound around the core tube body at the rotational speed of the elastic member.

  A winding core tube according to the present invention includes a core tube main body portion formed in a substantially cylindrical shape, and an elastic portion integrally formed on an inner peripheral surface of the core tube main body portion. According to this configuration, the winding core tube is in close contact with the shaft as the inner peripheral surface of the elastic portion is elastically deformed according to the shape of the contact surface of the shaft. At this time, since the elastic portion is elastically deformed substantially uniformly with respect to the contact surface of the shaft, the core tube main body portion can be mounted so as not to be eccentric with respect to the rotation shaft of the shaft of the machine. Moreover, since the elastic portion is integrally formed with the core tube main body portion, it does not easily peel off from the core tube main body portion even when rotating while being held by the shaft.

  Further, at least one of the core tube main body portion and the elastic portion of the winding core tube according to the present invention is provided with a rib formed on the inner peripheral surface along the cylindrical direction, and the core tube main body portion or the elastic portion It is preferable that at least one of the other is provided with an engaging portion in which a groove is cut along the rib and the rib can be fitted. According to such a configuration, it is possible to prevent the core tube main body portion from spinning freely around the center of the cylinder from the elastic portion that rotates while being held by the shaft, and the length wound around the core tube main body portion at the rotation speed of the elastic portion. The length sheet material can be fed out, and the long sheet material can be wound around the core tube main body at the rotational speed of the elastic portion.

  As described above, the winding core tube according to the present invention is excellent in that it can be attached to the shaft so as not to be eccentric with respect to the rotating shaft of the shaft of a machine such as a packaging machine, a printing machine, or a winder. Has an effect.

(A) is side surface sectional drawing of the core tube for winding which concerns on 1st Embodiment of this invention, (b) shows the principal part enlarged view of the a part of (a). (A) is side surface sectional drawing of the winding core tube which concerns on the 2nd Embodiment of this invention, (b) is a cylinder center direction sectional drawing, (c) is a principal part expansion of the a part of (b). FIG. (A)-(b) shows the principal part enlarged view of the core tube for winding which concerns on other embodiment. (A)-(b) shows the principal part enlarged view of the core tube for winding which concerns on other embodiment. (A) is a half cross-sectional view of a conventional paper tube in a state of being mounted on a shaft of a machine, and (b) is a cross-sectional view of the paper tube of (a) cut at the open end.

  A packaging material winding core tube which is a first embodiment of a winding core tube according to the present invention will be described with reference to FIG. The figure (a) is side surface sectional drawing of the core pipe 1 for packaging material winding, the figure (b) is the principal part enlarged view of the core pipe 1 for packaging material winding, The a part of the figure (a) is shown. FIG. The wrapping material winding core tube 1 includes a core tube main body 2 formed in a substantially cylindrical shape, and elastic members 3 provided at open ends of both ends of the core tube main body 2. An example in which a long sheet material is used as the packaging material of this embodiment will be described. The long sheet material includes a sheet and a film for wrapping an object to be packaged such as food or daily necessities, and also includes a base film or the like on which a label for affixing the sheet and the film is detachably attached.

  The core tube body 2 is integrally formed of a hard material, and has a strength capable of supporting at least the load (load) of the wrapped packaging material. Specifically, the material of the core tube body 2 is a plastic such as polyacetal, polypropylene (PP), or vinyl chloride.

  The elastic member 3 is formed in an annular shape along the inner peripheral surface 2b and the open ends 2c, 2c of the open end portions 2a, 2a of the core tube main body 2 in order to protect the inner peripheral surface 2b of the core tube main body 2. . The elastic member 3 is made of a material that is uniformly deformed with respect to a predetermined stress and can be restored before the stress is applied when the stress is released. Specifically, it is a plastic having a restoring property of hardness HS 50 to 100 (50 ° to 100 °) such as urethane and rubber.

  The elastic member 3 is inserted into the inner peripheral surface 2b of the core tube main body 2 and has a first annular portion 31 having an outer diameter that is substantially the same as the diameter of the inner peripheral surface 2b, and the open ends 2c and 2c of the core tube main body 2. And a second annular portion 32 having an outer diameter dimension substantially the same as the diameter of the outer peripheral surface 2d of the core tube main body 2.

  The first annular portion 31 can be attached to the core tube main body 2 by being fitted into the open end 2a of the core tube main body 2 and being fixed with an adhesive. The second annular portion 32 is integrally formed with the first annular portion 31, and is attached to the core tube body 2 by attaching the first annular portion 31 to the core tube body 2. The second annular portion 32 is formed on the inner peripheral surface 2b of the core tube main body 2 that can be contacted when at least the fixed holding member and the movable holding member of the packaging machine are attached to the core tube main body 2 via the second annular portion 32. Provided in the range. The second annular portion 32 is elastically deformed so that the fixed holding member, the movable holding member, and the like of the shaft are caught and held by the shaft.

  The elastic member 3 is integrated with the core tube main body 2 with respect to the rotation direction for feeding out the packaging material wound around the core tube main body 2 or the rotation direction for winding the packaging material around the core tube main body 2. Is attached to the core tube main body 2 so as to be rotatable.

  That is, the elastic member 3 according to the present embodiment has the groove 33 formed along the outer peripheral surface of the first annular portion 31. The groove 33 may be formed continuously over the entire circumference of the first annular portion 31 or may be formed discontinuously with a predetermined interval. At this time, the example in which one groove 33 is formed in the axial direction of the first annular portion 31 is described, but the number is not limited to one, and a plurality of grooves 33 may be formed in the axial direction. The elastic member 3 is fixed to the core tube body 2 by injecting an adhesive into the groove 33. By doing in this way, the 1st annular member 31 and the core pipe main body 2 of the elastic member 3 are fixed, and the elastic member 3 does not fall from the core pipe main body 2 with rotation of the shaft of a packaging machine. Yes.

  In addition, the elastic member 3 according to the present embodiment is configured so that the first annular member 31 is elastically deformed in a state where the first annular portion 31 is fitted into the inner peripheral surface 2b of the core tube main body 2, and thereby the inner portion of the core tube main body 2 is deformed. A gap 34 between the peripheral surface 2 b and the first annular member 31 may be filled, and an adhesive may be injected into the gap 34 to fix the gap to the core tube body 2. By doing so, the gap 34 between the first annular member 31 of the elastic member 3 and the inner peripheral surface 2b of the core tube main body 2 is also closed with the adhesive, and the core is rotated with the rotation of the shaft of the packaging machine. The elastic member 3 is prevented from falling off from the tube body 2. Of course, the adhesive must be injected so as not to leak from the gap 34 between the core tube main body 2 and the elastic member 3 to the outer peripheral surface side of the core tube main body 2 and the elastic member 3. When the adhesive is injected and fixed only in the groove 33 according to the present embodiment, the adhesive does not leak from the gap 34 to the outer peripheral surface side of the core tube main body 2 and the elastic member 3. In FIG. 1, the gap 34 is widely illustrated for simplicity of explanation, but it does not indicate that the gap 34 is fitted in the dimensional relationship with respect to the core tube 1. In addition, the case where it is further closely attached is also included.

  Next, the operation and effect of the packaging material winding core tube 1 mounted on the shaft of the packaging machine will be described. First, the fixed holding member and the movable holding member of the packaging machine are respectively mounted from the opening end portions of the elastic members 3 and 3. At this time, the wrapping material winding core tube 1 is in a state where the fixed holding member and the movable holding member bite into the outer peripheral surface of the second annular portion 32 by elastically deforming the outer peripheral surface of the second annular portion 32 substantially uniformly. And the core pipe 1 for packaging material winding can be mounted | worn by closely_contact | adhering to a shaft.

  When the packaging material winding core tube 1 is mounted on the shaft of the packaging machine, the shaft bites the fixed holding member and the movable holding member into the second annular portion 32 substantially uniformly by the elastic force of the elastic member 3, so The two annular portions 32 can be aligned with the central axis. Furthermore, since the central axis of the shaft coincides with the central axis of the packaging material winding core tube 1, it is possible to prevent eccentricity. Therefore, unlike the conventional paper tube, the hardness of the inner peripheral surface is non-uniform, so that the fixed holding member and the movable holding member of the shaft bite into the paper tube non-uniformly, and the central axis of the shaft The center axis of the paper tube is not eccentric.

  When the shaft is rotated, the wrapping material winding core tube 1 held on the shaft by the second annular portion 32 is fixed to the elastic members 3 and 3 and rotated from the elastic members 3 and 3 to the core tube main body 2. Can be prevented, the packaging material wound around the core tube main body 2 can be fed out at the rotational speed of the elastic members 3, 3, and the core tube main body at the rotational speed of the elastic members 3, 3 2 can be wrapped with a packaging material.

  The elastic members 3 and 3 are bitten by elastically deforming the fixed holding member and the movable holding member, but are removed before the fixed holding member and the movable holding member bite when removed from the shaft. The trace of the movable holding member does not remain on the inner peripheral surface of the second annular portion 32. Since the core tube main body 2 and the elastic member 3 are made of plastics, they can be easily cleaned. Therefore, it can be reused many times (about 20 to 100 times of use). Moreover, since paper dust does not come out like the conventional paper tube, paper dust does not mix in a packaging material.

  Next, a packaging material winding core tube according to a second embodiment of the winding core tube of the present invention will be described with reference to FIG. 1A is a side cross-sectional view of the packaging material winding core tube 1A, FIG. 1B is a cross-sectional view of the packaging material winding core tube 1A, and FIG. 1C is a packaging material. It is the principal part enlarged view of 1 A of winding core tubes, and is the figure which expanded the a part of the figure (b).

  The wrapping material winding core tube 1A is formed by coextrusion to form a substantially cylindrical core tube main body portion 2A and an elastic portion 3A integrally formed on the inner peripheral surface 2Ab of the core tube main body portion 2A. With. The core tube main body 2A is formed of a hard material. The elastic portion 3A is formed in a cylindrical shape with a constant thickness along the inner peripheral surface 2Ab of the core tube main body 2A so as to protect the inner peripheral surface 2Ab of the core tube main body 2A. The elastic portion 3A is made of an elastically deformable material that is uniformly deformed with respect to a predetermined stress and can be restored before the stress is applied when the stress is released. That is, the packaging material winding core tube 1A is formed into two layers of a hard tube core tube body portion 2A and an elastically deformable material elastic portion 3A.

  The core tube main body portion 2A includes a rib 21A formed on the inner peripheral surface 2Ab along the cylinder center direction, and the elastic portion 3A is cut into a groove corresponding to the rib 21A of the core tube main body portion 2A. It is integrally formed so as to have an engaging portion 31A that can be fitted. Specifically, the wrapping material winding core tube 1A is extruded while providing a single rib 21A continuously from one open end 2Aa to the other open end 2Aa in the tube core direction of the core tube main body 2A. Then, the elastic portion 3A is provided with the engaging portion 31A by extruding the elastic portion 3A having the inner peripheral surface of the wrapping material winding core tube 1A having substantially the same center as the center of the core tube main body 2A. The core tube main body 2A and the elastic portion 3A are integrally formed by extrusion.

  In addition, since the extrusion rate will become slow and cost will become high if the protrusion amount which rib 21A protrudes from 2 A of inner peripheral surfaces 2Ab of core pipe main-body part 2A becomes high, the one where the protrusion amount of rib 21A is low is good. Specifically, the protruding amount of the rib 21A is in the range of 1 mm to 10 mm (relative to the thickness of the core tube main body 2A of about 10 mm) (the range of 10% to 100% of the thickness of the core tube main body 2A). Preferably, it is provided in a range of 1 mm to 5 mm (a range of 10% to 50% of the thickness of the core tube main body 2A). Moreover, since the extrusion molding speed is reduced as the number of ribs 21A provided on the inner peripheral surface 2Ab of the core tube main body 2A increases, it is preferable that the number of ribs 21A be one, but one or more may be provided.

  Next, the operation and effect of the wrapping material winding core pipe 1A attached to the shaft of the packaging machine will be described. First, the fixed holding member and the movable holding member of the packaging machine are inserted and mounted from the opening end portions 3Aa and 3Aa side along the inner peripheral surface 3Ab of the elastic portion 3A. At this time, the packaging material winding core tube 1A is in a state in which the fixed holding member and the movable holding member bite into the inner circumferential surface 3Ab of the elastic portion 3A substantially uniformly elastically deformed. And the packaging material winding core tube 1A can be attached to the shaft by being brought into close contact with the shaft.

  When the wrapping material winding core tube 1A is attached to the shaft of the packaging machine, the shaft bites the fixed holding member and the movable holding member into the elastic portion 3A substantially uniformly by the elastic force of the elastic portion 3A. Can be adjusted to the center axis of Furthermore, since the central axis of the shaft coincides with the central axis of the wrapping material winding core tube 1A, eccentricity can be prevented. Therefore, unlike the conventional paper tube, the hardness of the inner peripheral surface is non-uniform, so that the fixed holding member and the movable holding member of the shaft bite into the paper tube non-uniformly, and the central axis of the shaft The center axis of the paper tube is not eccentric. Moreover, since the rib 21A is provided in the core tube main body part 2A, the core tube 1A for wrapping the packaging material is formed from the outer peripheral surface of the core tube main body part 2A to the inner peripheral surface as compared with the case where the engaging part 31A is provided. Even when a load is applied, the load concentrates on the portion where the rib 21A is provided, and the structure is unlikely to cause deformation or breakage.

  Then, when the shaft is rotated, the core tube main body portion 2A and the elastic portion 3A that are integrally formed are rotated together by the packaging material winding core tube 1A held on the shaft by the elastic portion 3A. In addition, since the core tube main body 2A and the elastic portion 3A are engaged with each other by the rib 21A and the engaging portion 31A, even if the elastic portion 3A receives a rotational force with the cylindrical core direction as the rotation center, the elastic portion Since 3A and the core tube main body 2A are not easily separated, it is possible to prevent the elastic portion 3A from spinning around the core tube main body 2A. Therefore, the packaging material wound around the core tube main body 2A can be fed out at the rotation speed of the elastic portion 3A, and the packaging material can be wound around the core tube main body 2A at the rotation speed of the elastic portion 3A.

  Moreover, even if the core material 1A for wrapping a wrapping material is used, even if the inner peripheral surface 3Ab of the elastic portion 3A is worn away and does not bite uniformly into the shaft, both ends of the opening are provided. By cutting and cutting 2Aa, 2Aa, 3Aa, 3Aa, the inner peripheral surface of the elastic portion 3A that is not worn because it is not in contact with the shaft on the inner side in the cylinder core direction than the opening end portion 3Aa, 3Aa that is worn due to contact with the shaft 3Aa, 3Aa can be used as a new opening end, and the packaging material winding core tube 1A can be reused.

  Further, the core tube 1A for wrapping the packaging material is formed by separately extruding the core tube main body portion 2A and the elastic portion 3A without coextruding the core tube main body portion 2A and the elastic portion 3A. Even if the engaging portion 31A formed in at least one of the core tube main body portion 2A and the elastic portion 3A is fitted into the rib 21A formed in at least one of the 2A or the elastic portion 3A, the same effect is obtained. Can play.

  Note that the winding core tube according to the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made without departing from the gist of the present invention.

  The core tube 1 for wrapping a wrapping material according to the first embodiment injects an adhesive into the groove 33 of the elastic member 3 and fits the elastic member 3 into the core tube main body 2. However, the present invention is not limited to this.

  For example, like the core tube 100 for wrapping a packaging material shown in FIG. 3A, the elastic member 130 is formed in an annular shape so as to follow only the inner peripheral surfaces of the open end portions at both ends of the core tube main body 120. It may be. The elastic member 130 has a groove 131 formed on the outer peripheral surface. The elastic member 130 may be fixed to the core tube main body 120 by injecting an adhesive into the groove 131.

  Even if the length of the core tube main body 120 in the central axis direction is shortened by cutting the packaging material winding core tube 100, the elastic member 130 is simply bonded to the inner peripheral surface of the opened opening. Thus, the shaft can be held. Therefore, the length of the core tube main body 120 in the central axis direction can be adjusted in accordance with the dimensions of the packaging material used in the packaging material winding core tube 100.

  Moreover, like the packaging material winding core tubes 200 and 300 shown in FIGS. 3B and 4A, the core tube main bodies 220 and 320 include support tube portions 221 and 321 for winding the packaging material, and an elastic member. 230 and 330 may be provided with receiving portions 222 and 322 having an inner diameter wider than the inner diameter of the support pipe portions 221 and 321. On the other hand, the elastic members 230 and 330 are brought into contact with the first annular portions 231 and 331 having outer diameters substantially the same as the diameters of the inner peripheral surfaces of the receiving portions 222 and 322 and the open ends of the core tube main bodies 220 and 320. You may make it provide the 2nd cyclic | annular part 232,332 which has an outer diameter dimension substantially the same as the aperture diameter of the outer peripheral surface of the core pipe main bodies 220,320. Such wrapping material winding core tubes 200 and 300 can prevent the opening end portion from being narrowed by attaching the elastic members 230 and 330, and the shaft of an existing packaging machine can be used as it is. it can.

  The wrapping material winding core tube 200 has a female screw 223 formed on the inner peripheral surface of the receiving portion 222 of the core tube main body 220, and a male screw 233 formed on the first annular portion 231 of the elastic member 230 so as to correspond to the female screw 223. In addition, the core tube main body 220 and the elastic member 230 are attached. The rotation direction for fastening the female screw 223 and the male screw 233 and the rotation direction for feeding out the packaging material wound around the core tube main body 220 or the rotation direction for winding the packaging material around the core tube main body 220 are reversed. Thus, even if the shaft is rotated while the elastic member 230 is held on the shaft, the elastic member 230 can be attached to the core tube main body 220 so as to be rotatable integrally with the core tube main body 220.

  In the core tube 300 for wrapping the packaging material, the inner diameter of the inner peripheral surface of the receiving portion 322 of the core tube main body 320 and the outer diameter of the first annular portion 331 of the elastic member 330 are substantially the same, or the first annular portion. The outer diameter of 331 is formed so as to be slightly wider, and can be mounted with the receiving portion 322 and the first annular portion 331 being in close contact with each other.

  As described above, the wrapping material winding core tubes 200 and 300 have the elastic members 230 and 330 detachably attached to the core tube main bodies 220 and 320, so that the elastic members 230 and 330 are attached to the shaft for a long time. Even when the elastic force is reduced due to the deterioration over time due to the mounting over several times and the elastic deformation cannot be made substantially uniformly, the elastic member 2300.330 is removed from the core tube main bodies 220 and 320, and a new article is obtained. The elastic force can be returned to the original by exchanging with the elastic members 230 and 330. As described above, it is possible to prevent the core tube main bodies 220 and 320 from being eccentric with respect to the rotational axis of the shaft of the packaging machine due to deterioration over time.

  A type in which the elastic members 3 and 130 are inserted into the inner peripheral surface side of the core tube main bodies 2 and 120, such as the core tube 1 for wrapping a wrapping material according to this embodiment and the core tube 100 for wrapping a wrapping material. The inner diameter of the core tube main body 2,120 and the outer diameter of the outer peripheral surface of the elastic member 3, 130 (or the first annular portion 31) in contact with the inner peripheral surface of the core tube main body 2,120. If formed so as to substantially match, the elastic members 3, 130 can be mounted in close contact with the core tube main bodies 2, 120 without using an adhesive. Alternatively, if the inner diameter of the core tube main body 2,120 is formed to be slightly narrower than the outer diameter of the outer peripheral surface of the elastic member 3,130 in contact with the inner peripheral surface of the core tube main body 2,120, Since the outer peripheral surface of the elastic members 3, 130 is elastically deformed in accordance with the inner diameter of the inner peripheral surface of the core tube main body 2, 120, the elastic members 3, 130 are mounted in a state of being more closely attached to the core tube main body 2, 120 be able to.

  4B, female threads 421 are formed on the inner peripheral surfaces 420b of the open end portions at both ends of the core tube main body 420, while the elastic member 430 has a first shape. A male screw 433 is formed on the outer peripheral surface of the one annular portion 431 so as to correspond to the female screw 421 formed in the core tube main body 420, and the first annular portion 431 of the elastic member 430 is placed in the opening end portion of the core tube main body 420. The structure to insert may be sufficient. In this case, an adhesive may be injected into the gap 434 between the core tube main body 420 and the elastic member 430 including the space between the female screw 421 and the male screw 433 to fix the same.

  The packaging material winding core tube 1, 1 </ b> A according to the first or second embodiment has been described as an example in which the core tube body 2 or the core tube body 2 </ b> A is made of plastics, but is not limited thereto. . The material of the core tube main body may be a conventional paper as long as it can withstand the stress of the packaging material to be wound.

  Moreover, the core tube for wrapping the packaging material may be manufactured by mixing an antibacterial agent into the core tube body and the elastic member. The core material for wrapping a wrapping material manufactured in this way can suppress the occurrence of mold on the core tube body and the elastic member.

  Moreover, although the core tube 2A for packaging material winding which concerns on 2nd Embodiment demonstrated the example which equips the core tube main-body part 2A with the rib 21A and equips the elastic part 3A with the engaging part 31A, it is limited to this. is not. For example, the core tube body of the wrapping material winding core tube 2 according to the first embodiment is provided with ribs, and the elastic member is provided with an engaging portion, so that the elastic member can be rotated integrally with the core tube body. You may make it mount | wear with a pipe | tube main body. In addition, the packaging material winding core tube according to the first or second embodiment may include a rib in the elastic portion and an engaging portion in the core tube main body portion, or may not include the rib and the engaging portion. Also good. Even when ribs and engaging portions are provided in the packaging material winding core tube 2 according to the first embodiment, the winding material winding core tube 2A according to the second embodiment rotates while being held by the shaft. It is possible to prevent the core tube body from spinning around the center of the cylinder from the moving elastic member.

  Moreover, although the core material 2A for packaging material winding which concerns on 2nd Embodiment demonstrated the example which shape | molds the core pipe main-body part 2A and the elastic part 3A integrally by extrusion molding, it is not limited to this. For example, the core tube for wrapping the packaging material may be formed by insert molding, outsert molding, or other methods for the core tube main body portion and the elastic portion.

  DESCRIPTION OF SYMBOLS 1 ... Core tube for winding packaging materials, 2 ... Core tube main body, 2a ... Open end part, 2b ... Inner peripheral surface, 2c ... Open end, 2d ... Outer peripheral surface, 21 ... Female screw, 3 ... Elastic member, 31 ... 1st Annular part, 32 ... second annular part, 33 ... groove, 34 ... gap, 4 ... holding member, 41 ... fixed holding member, 42 ... movable holding member, 1A ... core pipe for wrapping packaging material, 2A ... core pipe main body part 2Aa ... open end, 2Ab ... inner peripheral surface, 21A ... rib, 3A ... elastic part, 3Aa ... open end, 3Ab ... inner peripheral surface, 31A ... engagement part, 5 ... shaft, 100 ... for wrapping packaging material Core tube, 120 ... core tube main body, 130 ... elastic member, 131 ... groove, 200 ... core tube for wrapping packaging material, 220 ... core tube main body, 221 ... support tube portion, 222 ... receiving portion, 223 ... female screw, 230 ... Elastic member, 231... First annular portion, 232... Second annular portion, 233. Wrapping material winding core tube, 320 ... core tube body, 321 ... support tube portion, 322 ... receiving portion, 330 ... elastic member, 331 ... first annular portion, 332 ... second annular portion, 500 ... paper tube (packaging material) Winding core tube), 500a, 500a '... open end, 500b, 500b' ... inner peripheral surface

Claims (4)

  A winding core tube comprising: a core tube main body formed in a substantially cylindrical shape; and an elastic member provided at an open end of the core tube main body.   The winding core tube according to claim 1, wherein the elastic member is attached to the core tube main body so as to be rotatable integrally with the core tube main body.   A winding core tube comprising: a core tube main body portion formed in a substantially cylindrical shape; and an elastic portion integrally formed on an inner peripheral surface of the core tube main body portion.   At least one of the core tube main body part or the elastic part is provided with a rib formed on the inner peripheral surface along the cylindrical direction, and at least one of the core tube main body part or the elastic part has a groove along the rib. The winding core tube according to claim 3, further comprising an engagement portion that is cut and into which a rib can be fitted.

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