Patent Publication Number: US-2006011775-A1

Title: Reel members and film winding methods

Description:
This is a Divisional Application of U.S. application Ser. No. 10/642,235 filed on Aug. 18, 2003, which is a Continuation of Application No. PCT/JP02/01143 filed Feb. 12, 2002. The entire disclosure of the prior applications are hereby incorporated by reference herein in its entirety. 
    
    
     BACKGROUND  
      The present invention relates to the technique of winding a long continuous film such as an anisotropic conductive adhesive film or an insulating adhesive film, for example.  
      Generally, an anisotropic conductive adhesive film or an insulating adhesive film is used to electrically connect electronic components such as liquid crystal panels or IC chips to each other, for example.  
      Such adhesive films are delivered to clients in the form of rolls of the films wound around reel members finished through certain preparation processes.  
      Recently, further longer adhesive films are desired from the client side.  
      However, longer adhesive films involve greater roll diameters, which cause a higher stress to be generated in the adhesive films with the result that adhesive may be squeezed out of the adhesive films.  
      The present invention was made to solve these technical problems with the purpose of providing a method for winding a long adhesive film at multiple stages in such a diameter that adhesive cannot be squeezed out, and of providing a reel member that can be applied to this method.  
     SUMMARY  
      The present invention provides a reel member comprising a winding spool around which a given film can be wound and a plurality of flanges mounted on the winding spool, wherein each of the flanges has a guide groove for passing the film between winding spools adjacent to each other. By using the reel member of the present invention, the film can be smoothly moved from a winding spool on one side to a winding spool on the other side by passing the film through the guide groove at the stage when winding of the film around the winding spool on the one side has been completed.  
      In the reel member of the present invention, an engaging part capable of engaging with the film is advantageously formed in the guide groove.  
      Thus, the film can be wound around a winding spool on the other side by catching the film at the engaging part in the guide groove when it is passed through the guide groove.  
      In the reel member of the present invention, a retaining part capable of retaining the film is advantageously formed in the guide groove.  
      Thus, the film can be wound around a winding spool on the other side without slack by retaining the film at the retaining part in the guide groove when it is passed through the guide groove.  
      In the reel member of the present invention, the guide grooves are advantageously opposed to each other.  
      Thus, the film can be axially moved or caught at the same timing between flanges.  
      In the reel member of the present invention, the outer diameter of the flange is advantageously determined on the basis of the value of the stress generated in the film wound around the winding spool.  
      This ensures that the film can be wound without running off the outer periphery of the flange, whereby the adhesive cannot be squeezed out.  
      In the reel member of the present invention, the winding spools are advantageously axially connectable to each other.  
      Thus, a long film can be handled as appropriate by adjusting the number of reel members depending on the length of the film.  
      The present invention also provides a reel member comprising a winding spool around which a given film can be wound and a plurality of flanges mounted on the winding spool and having an engaging projection capable of engaging with the film on the outer periphery.  
      The reel member of the present invention has the advantage that not only the film can be smoothly moved from a winding spool on one side to a winding spool on the other side or can be caught at the engaging projection but also the range of the timing of performing this can be wider.  
      In the reel member of the present invention, the engaging projections are advantageously opposed to each other.  
      Thus, the film can be axially moved or caught at the same timing between flanges.  
      The present invention also provides a reel member comprising a winding spool around which a given film can be wound and a flange mounted on the winding spool and having an engaging projection capable of engaging with the film on the outer periphery, wherein the winding spools are axially connectable to each other.  
      The present invention also provides a reel member comprising a winding spool around which a given film can be wound and a flange mounted on the winding spool and having a guide groove for passing the film, wherein the winding spools are axially connectable to each other.  
      The present invention also provides a reel member assembly formed of a plurality of reel members connected to each other, each reel member comprising a winding spool around which a given film can be wound and a flange mounted on the winding spool and having a guide groove for passing the film wherein the winding spools are axially connectable to each other.  
      According to the present invention wherein the winding spools are axially connectable to each other, a long film can be handled as appropriate by adjusting the number of reel members depending on the length of the film.  
      The present invention also provides a film package comprising a reel member assembly formed of a plurality of reel members connected to each other, each reel member comprising a winding spool around which a given film can be wound and a flange mounted on the winding spool and having a guide groove for passing the film wherein the winding spools are axially connectable to each other and wherein a continuous film is wound around the winding spool of the reel member assembly.  
      According to the film package of the present invention, a long film can be easily handled at the market.  
      In the film package of the present invention, an empty winding spool is advantageously interposed between winding spools around which the film is wound.  
      The present invention also provides a reel member comprising a plurality of winding spools coaxially arranged at predetermined intervals and a flange mounted at each end of each winding spool wherein a guide groove is cut away from each flange at a given center angle and the guide grooves are arranged with a phase shift of the center angle.  
      According to the reel member of the present invention, the center of gravity of the reel member as a whole can be located on the winding axis so that a long film can be wound always at a constant torque and can be guided between opposed guide edges in the guide grooves adjacent to each other to the next winding spool.  
      In the reel member of the present invention, a spacer spool for guiding the film is advantageously inserted between the winding spools.  
      Thus, the film can be guided along the side face of the spacer spool to the next winding spool and the film can be gently passed by selecting the length of the spacer spool.  
      In the reel member of the present invention, the opposed guide edges in the guide grooves adjacent to each other are advantageously chamfered at a given angle.  
      Thus, the film can be smoothly guided to the next winding spool along the chamfered bevel of the flange.  
      The present invention also provides a film package comprising a reel member comprising a plurality of winding spools coaxially arranged at predetermined intervals and a flange mounted at each end of each winding spool and having a guide groove cut away from each flange at a given center angle and the guide grooves are arranged with a phase shift of the center angle wherein a continuous film is wound around the reel member.  
      The film used in the film package of the present invention is preferably an insulating adhesive film or an anisotropic conductive adhesive film.  
      In the film package of the present invention, the film advantageously comprises an adhesive applied on a release film and the release film is exposed at a necessary part for passing the film from one to the other side of the flange.  
      This has the advantage that not only the insulating adhesive film or anisotropic conductive adhesive film can be saved but also the quality of the insulating adhesive film or anisotropic conductive adhesive film can be guaranteed to clients who avoid using kinks when the film is passed.  
      The present invention also provides a method for winding a continuous film drawn out from the feeding side onto a winding shaft at multiple stages, comprising the steps of: 
          winding a given part of the film onto a part of the winding shaft by rotating the winding shaft at a given speed, and then     winding the given part of the film onto another part of the winding shaft by stopping or slowing the rotation of the winding shaft and axially moving the winding shaft relative to the feeding side.        

      According to the method for winding a film of the present invention, a long film can be wound at multiple stages within a desired limited roll diameter of the film, and especially an insulating adhesive film or anisotropic conductive adhesive film can be wound at multiple stages within such a roll diameter that the adhesive cannot be squeezed out.  
      The present invention also provides a method for winding a continuous film drawn out from the feeding side onto a winding shaft at each part of the winding shaft divided by flanges, comprising the steps of: 
          winding a given part of the film onto a part of the winding shaft by rotating the winding shaft at a given speed, and then     winding the given part of the film on another part of the winding shaft after passing the film over the flange by stopping or slowing the rotation of the winding shaft and axially moving the winding shaft relative to the feeding side.        

      According to the method for winding a film of the present invention, a long film can be wound at multiple stages within a limited diameter even when a reel member having a plurality of flanges on the winding axis is used.  
      The present invention also provides a method for winding a continuous film using a reel member comprising a winding spool and a plurality of flanges mounted on the winding spool and having a guide groove for passing the film between winding spools adjacent to each other, comprising the step of winding the film on a winding spool and then the next winding spool with at least one empty winding spool being interposed.  
      According to the method for winding a film of the present invention, a film can be wound at multiple stages while it is passed over the flange without folding.  
      The present invention also provides a method for winding a continuous film using a reel member comprising a plurality of winding spools coaxially arranged at predetermined intervals, and a flange mounted at each end of each winding spool and having a guide groove cut away from each flange at a given center angle and arranged with a phase shift of the center angle, the method comprising the step of shifting the timing of axially moving the winding spools by the center angle of the guide groove.  
      According to the method for winding a film of the present invention, the weight can be evenly balanced and a film can be smoothly passed while it is spirally guided.  
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       FIG. 1 ( a ) is a front view showing the outline structure of a reel member according to a first embodiment of the present invention and  FIG. 1 ( b ) is a right side view showing the outline structure of the reel member.  
       FIG. 2 ( a ) is a left side view showing the outline structure of a reel member according to a second embodiment of the present invention,  FIG. 2 ( b ) is a front view showing the outline structure of the reel member,  FIG. 2 ( c ) is a right side view showing the outline structure of the reel member and  FIG. 3  is a front view showing that such reel members are connected.  
       FIG. 4 ( a ) is a front view showing the outline structure of a reel member according to a third embodiment of the present invention and  FIG. 4 ( b ) is a right side view showing the outline structure of the reel member.  
       FIG. 5 ( a ) is a front view showing the outline structure of a reel member according to a fourth embodiment of the present invention and  FIG. 5 ( b ) is a right side view showing the outline structure of the reel member.  
       FIG. 6 ( a ) is a front view showing the outline structure of a reel member according to a fifth embodiment of the present invention,  FIG. 6 ( b ) is a right side view showing the outline structure of the reel member and  FIG. 7  is a front view showing that such reel members are connected on a shaft.  
       FIG. 8 ( a ) is a front view showing the outline structure of a reel member according to a sixth embodiment of the present invention,  FIG. 8 ( b ) is a plan view showing the outline structure of the reel member and  FIG. 8 ( c ) is an enlarged view of a retaining groove of the reel member.  
       FIG. 9 ( a ) is a front view showing the outline structure of a reel member according to a seventh embodiment of the present invention and  FIG. 9 ( b ) is an enlarged view of a retaining groove of the reel member.  
       FIG. 10  is a front view showing the outline structure of a reel member according to an eighth embodiment of the present invention.  
       FIG. 11 ( a ) is a front view showing the outline structure of a reel member according to a ninth embodiment of the present invention and  FIG. 11 ( b ) is an enlarged view of a part of a retaining groove of the reel member.  
       FIG. 12 ( a ) is a front view showing the outline structure of a reel member according to a tenth embodiment of the present invention and  FIG. 12 ( b ) shows the positional relationship between guide grooves in the flanges of the reel member.  
       FIG. 13 ( a ) is a right side view of the reel member taken along S 1 -S 1  line of  FIG. 12 ( a ),  FIG. 13 ( b ) is a right side view of the reel member taken along S 2 -S 2  line,  FIG. 14  is a diagram for illustrating the bevel angle of the reel member,  FIG. 15  is a front view showing a film package comprising a film wound around the reel member, and  FIG. 16  shows the reel member disassembled into several components.  
       FIG. 17  is a front view showing the outline structure of an example of a multistage winding system for carrying out a method for winding a film according to the present invention,  FIG. 18  is a left side view showing the outline structure of the multistage winding system.  
       FIG. 19 ( a ) and  FIG. 19 ( b ) show how a film is wound around a reel member of the present invention according to a method for winding a film of the present invention.  
       FIG. 20 ( a ) and  FIG. 20 ( b ) show how a film is wound around a reel member of the present invention according to a method for winding a film of the present invention.  
       FIG. 21 ( a ) and  FIG. 21 ( b ) show how a film is wound around a reel member of the present invention according to a method for winding a film of the present invention.  
       FIG. 22 ( a ) and  FIG. 22 ( b ) show how a film is wound around a reel member of the present invention according to a method for winding a film of the present invention.  
       FIG. 23 ( a ) and  FIG. 23 ( b ) show how a film is wound around a reel member of the present invention according to a method for winding a film of the present invention.  
       FIG. 24 ( a ) and  FIG. 24 ( b ) show how a film is wound around a reel member of the present invention according to a method for winding a film of the present invention.  
       FIG. 25 ( a ) is a left side view showing an embodiment of a film package of the present invention and  FIG. 25 ( b ) is a front view showing the film package.  
       FIG. 26  is a front view showing another embodiment of a film package of the present invention.  
       FIG. 27  shows how a film is wound around another reel member of the present invention according to a method for winding a film of the present invention.  
       FIG. 28  shows how a film is wound around another reel member of the present invention according to a method for winding a film of the present invention.  
       FIG. 29  shows how a film is wound around another reel member of the present invention according to a method for winding a film of the present invention.  
       FIG. 30  shows how a film is wound around another reel member of the present invention according to a method for winding a film of the present invention. 
    
    
      Various numeral references represent the following elements:  50 (A-H, K, L), reel member;  51 (A-H, K, L), flange;  52 (A-H, K, L), winding spool;  520 L, spacer spool;  53 (A-C, E, F, G, H, K, L), guide groove;  54 (A-H), guide edge;  54 L, guide edge;  56 (D), engaging projection;  57 (F, G, H, K), retaining groove;  60 (B, C, E, K), reel member assembly;  70 (A, B, C), film package.  
     DETAILED DESCRIPTION OF EMBODIMENTS  
      Reel members of the present invention are used to wind a continuous long film at multiple stages.  
      Films used in the present invention are advantageously, but not limited to, insulating adhesive films or anisotropic conductive adhesive films, especially for electrically connecting electrodes of circuit boards to electrodes of IC chips.  
      Insulating adhesive films here comprise an insulating adhesive formed as a film on a release film. Anisotropic conductive adhesive films are similar films except that the adhesive contains conductive particles.  
      Now, preferred embodiments of reel members capable of winding such insulating adhesive films and anisotropic conductive adhesive films (hereinafter sometimes referred to as simply “films”) are explained with reference to the attached drawings.  
      In the films used in the following embodiments, the adhesive is removed at predetermined intervals to partially expose the release film.  
       FIG. 1 ( a ) is a front view showing the outline structure of a reel member according to a first embodiment of the present invention and  FIG. 1 ( b ) is a right side view showing the outline structure of the reel member.  
      As shown in  FIG. 1 ( a ) and ( b ), reel member  50 A according to the present embodiment is integrally formed of e.g. a resin and comprises a winding spool  52 A and a plurality of flanges  51 A.  
      Flanges  51 A are formed as discs having a given outer diameter and arranged in parallel to each other at predetermined intervals on cylindrical winding spool  52 A.  
      The insulating adhesive film or anisotropic conductive adhesive film used here not shown comprises adhesive films of a predetermined length (e.g. 25 m) repeatedly formed at predetermined intervals on a release film depending on the film width (e.g. 1.9 mm) or film thickness (e.g. 0.1 mm) in order that adhesive cannot be squeezed out of the release film under the stress generated during winding.  
      Each interval between adhesive films, i.e. each exposed length of the release film is determined within a minimum range necessary for passing the film in the direction of the winding spool in order to save the adhesive film during winding at multiple stages.  
      To adapt reel member  50 A according to the present embodiment to such a film, the number of flanges  51 A is determined depending on the repetition number of the adhesive films and each interval between flanges  51 A is determined to be somewhat greater than the film width. The outer diameter of flange  51 A is determined to be greater than the roll diameter depending on the length of the adhesive film in order to protect the rolled film.  
      As shown in  FIG. 1 ( b ), each flange  51 A has a guide groove  53 A of the same shape for passing the film to another flange  51 A adjacent thereto. Guide grooves  53 A are each cut away in an approximately sectorial shape to only partially expose the rolled film and axially aligned in opposite to guide grooves  53 A in flanges  51 A adjacent thereto.  
      Thus, a guide edge  54 A formed on the outer periphery of each guide groove  53 A comes into contact with the film at the same position as the other guide edges  54 A in the circumferential direction of flange  51 A.  
      Winding spool  52 A is formed in a length depending on the number of flanges  51  or the interval therebetween. Winding spool  52 A has an axially running through-hole  55 A of a given cross section, and the through-hole  55 A has a shape in which can be fitted e.g. a keyed shaft not shown in the present embodiment.  
       FIG. 2 ( a ) is a left side view showing the outline structure of a reel member according to a second embodiment of the present invention,  FIG. 2 ( b ) is a front view showing the outline structure of the reel member and  FIG. 2 ( c ) is a right side view showing the outline structure of the reel member.  FIG. 3  is a front view showing that such reel members are connected.  
      As shown in  FIG. 2 ( a ) to  FIG. 2 ( c ), reel member  50 B according to the present embodiment comprises a winding spool  52 B and a flange  51 B integrally formed with each other.  
      In the case of the present embodiment, flange  51 B differs from flange  51 A of the first embodiment in the shape of guide groove  53 B. That is, this guide groove  53 B is formed in a shape radially extending to the vicinity of winding spool  52 B in a width greater than the film width.  
      Winding spool  52 B comprises a spool segment  52 B 1  having a length somewhat greater than the film width and an insert segment  52 B 2  coaxial with spool segment  52 B 1  with flange  51 B interposed therebetween, wherein insert segment  52 B 2  is in the form of a keyed cylinder while spool segment  52 B 1  has a bore having a key groove in which can be fitted insert segment  52 B 2 .  
      Thus, a reel member  50 B is axially connected to another reel member  50 B having the same structure so that guide grooves  53 B in flanges  51 B of both members are axially aligned in opposite to each other.  
      Winding spool  52 B has a through-hole  55 B in the same manner as in the previous embodiment. In the present embodiment, this through-hole  55 B has a form in which can be fitted a shaft having a cross section in the form of a letter “D”.  
      As shown in  FIG. 3 , e.g. four such reel members  50 B are connected to form a reel member assembly  60 B wherein winding spools  55 B are combined into one winding spool and flanges  51 B are arranged in parallel to each other.  
       FIG. 4 ( a ) is a front view showing the outline structure of a reel member according to a third embodiment of the present invention and  FIG. 4 ( b ) is a right side view showing the outline structure of the reel member.  
      As shown in FIGS.  4 ( a ) and ( b ), reel member  50 C according to the present embodiment comprises a winding spool  52 C and two flanges  51 C integrally formed with each other.  
      In the case of the present embodiment, flanges  51 C are identical with flanges  51 B of the second embodiment and arranged in parallel to each other on winding spool  52 C.  
      Winding spool  52 C has the same structure as that of winding spool  52 B of the second embodiment except that it differs from the second embodiment in length because two flanges  51 B are provided.  
      As shown in  FIG. 3 , e.g. two such reel members  50 C are connected to form a reel member assembly  60 C in the same manner as in the second embodiment.  
       FIG. 5 ( a ) is a front view showing the outline structure of a reel member according to a fourth embodiment of the present invention and  FIG. 5 ( b ) is a right side view showing the outline structure of the reel member.  
      As shown in FIGS.  5 ( a ) and ( b ), reel member  50 D according to the present embodiment comprises a winding spool  52 D and a flange  51 D integrally formed with each other.  
      In the case of the present embodiment, flange  51 D differs from flanges  51 A to  51 C of the first to third embodiments in that it has no guide groove. That is, this flange  51 D is formed by gradually increasing the radius of a part of the outer periphery of flange  51 A to  51 C of the previous embodiments into an arc having an engaging projection  56 D having a guide edge  54 D capable of coming into contact with the film at the part where the difference in radius is maximum.  
      Winding spool  52 D has the same structure as that of winding spool  52 B of the second embodiment.  
       FIG. 6 ( a ) is a front view showing the outline structure of a reel member according to a fifth embodiment of the present invention and  FIG. 6 ( b ) is a right side view showing the outline structure of the reel member.  FIG. 7  is a front view showing that such reel members are connected on a shaft.  
      As shown in  FIG. 6 ( a ) and ( b ), reel member  50 E according to the present embodiment comprises a winding spool  52 E and a pair of flanges  51 E integrally formed with each other.  
      In the case of the present embodiment, flanges  51 E have the same structure as that of flanges  51 C of the third embodiment.  
      On the other hand, winding spool  52 E has a through-hole  55 E having a circular cross section with a key groove in the same manner as in the first embodiment.  
      As shown in  FIG. 7 , plurality of such reel members  50 E are connected on a shaft by e.g. adhesion to form a reel member assembly  60 E.  
       FIG. 8 ( a ) is a front view showing the outline structure of a reel member according to a sixth embodiment of the present invention,  FIG. 8 ( b ) is a plan view showing the outline structure of the reel member and  FIG. 8 ( c ) is an enlarged view of a retaining groove of the reel member.  
      As shown in  FIG. 8 ( a ) to  FIG. 8 ( c ), reel member  50 F according to the present embodiment comprises a winding spool  52 F and a flange  51 F integrally formed with each other.  
      Flange  51 F of the present embodiment has a guide groove  53 F similar to the guide groove in flange  51 A of the first embodiment except for additional features as follows.  
      That is, flange  51 F has a thickness of 5 mm to 6 mm to protect the film against folding when it is passed on guide edge  54 F in guide groove  53 F and the part including this guide edge  54 F has a convex cross section so that guide edge  54 F is curved.  
      Flange  51 F also has a retaining groove  57 F for retaining the film to prevent slack when the film is passed to another reel member.  
      This retaining groove  57 F has a width somewhat smaller than the thickness of the film and extends in a direction approximately orthogonal to the radial direction of flange  51 F from the corner of guide groove  53 F on guide edge  54 F.  
      Winding spool  52 F has the same structure as that of winding spool  52 B of the second embodiment.  
       FIG. 9 ( a ) is a front view showing the outline structure of a reel member according to a seventh embodiment of the present invention and  FIG. 9 ( b ) is an enlarged view of a retaining groove of the reel member.  
      As shown in  FIG. 9 ( a ) and ( b ), reel member  50 G according to the present embodiment comprises a winding spool  52 G and a flange  51 G integrally formed with each other.  
      Flange  51 G of the present embodiment is similar to flange  51 F of the sixth embodiment except that it has a retaining groove  57 G different from retaining groove  57 F of the sixth embodiment.  
      Retaining groove  57 G has a leading groove  57 G 1  extending to the proximity of the center of flange  51 G from the corner of guide groove  53 G on guide edge  54 G. This retaining groove  57 G has a width greater than the thickness of the film. Leading groove  57 G 1  in guide groove  53 G A terminates in circular retaining hole  57 G 2  having a diameter somewhat greater than the width of the film.  
      A projecting anchor  57 G 3  is formed near retaining hole  57 G 2  in leading groove  57 G 1  so that the width of leading groove  57 G 1  is smaller than the thickness of the film.  
      Winding spool  52 G has the same structure as that of winding spool  52 B of the second embodiment.  
       FIG. 10  is a front view showing the outline structure of a reel member according to an eighth embodiment of the present invention.  
      As shown in  FIG. 10 , reel member  50 H according to the present embodiment comprises a winding spool  52 H and a flange  51 H integrally formed with each other.  
      In the case of the present embodiment, flange  51 H has a plurality of guide grooves  53 H. These guide grooves  53 H are formed at regular intervals on the outer periphery of flange  51 H at the same center angle to locate the center of gravity of flange  51 H itself on winding spool  52 H to keep a balance.  
      Retaining groove  57 H is also formed in the same shape on the same position in each guide groove  53 H. Each retaining groove  57 H has a width relatively greater than the thickness of the film and extends in one direction from a corner of guide groove  53 H and turns in a radial direction in a width somewhat smaller than the thickness of the film.  
      Winding spool  52 H has the same structure of winding spool  52 B of the second embodiment.  
       FIG. 11 ( a ) is a front view showing the outline structure of a reel member according to a ninth embodiment of the present invention and  FIG. 11 ( b ) is an enlarged view of a part of a retaining groove of the reel member.  
      As shown in FIGS.  11 ( a ) and ( b ), reel member  50 K according to the present embodiment comprises a winding spool  52 K and a plurality of flanges  51 K integrally formed with each other.  
      In the case of the present embodiment, flanges  51 K are formed in the shape of a sector having the same center angle and arranged at regular intervals on the outer periphery of winding spool  52 K to keep a balance similarly to the previous embodiment. These flanges  51 K form guide grooves  53 K between flanges  51 K and have a guide edge  54 K on one edge of each flange  51 K.  
      Retaining groove  57 K comprises a first retaining groove  57 K 1  running from a corner of each guide groove  53 K into flange  51 K to extend into the winding direction of winding spool  52 K and further incise winding spool  52 K and a second retaining groove  57 K 2  formed on the edge of another flanges  51 K opposed to guide edge  54 K.  
      This second retaining groove  57 K 2  is formed to extend in a direction reverse to the winding direction on the same circumference having the roll diameter of the film.  
      Winding spool  52 K has the same structure as that of winding spool  52 B of the second embodiment except that it is partially incised by retaining groove  57 K 1 .  
       FIG. 12 ( a ) is a front view showing the outline structure of a reel member according to a tenth embodiment of the present invention and  FIG. 12 ( b ) shows the positional relationship between guide grooves in the flanges of the reel member.  FIG. 13 ( a ) is a right side view of the reel member taken along S 1 -S 1  line and  FIG. 13 ( b ) is a right side view of the reel member taken along S 2 -S 2  line.  FIG. 14  is a diagram for illustrating the bevel angle of the reel member.  
      As shown in  FIG. 12 ( a ), reel member  50 L according to the present embodiment comprises winding spools  52 L and spacer spools  520 L and plurality of flanges  51 L integrally formed with each other. Here, a plurality of winding spools  52 L and spacer spools  520 L are alternately arranged.  
      The outer diameter and the length of spacer spool  520 L are determined on the basis of given conditions described below provided that they are greater than the outer diameter and the length of winding spool  52 L.  
      Each flange  51 L has a guide groove  53 L cut away in the form of a sector at a given center angle.  
      Here, the weight of reel member  50 L as a whole is evenly balanced with respect to the winding axis by selecting the center angle θ of guide groove  53 L to be 360 degrees/n (“/” means a ratio) and phase-shifting guide grooves  53 L at intervals of this center angle θ provided that n means the unit number of flanges  51 L forming reel member  50 L.  
      When the unit number n of flanges  51 L is 4, for example, the center angle θ of guide groove  53 L is 90 degrees and accordingly the total number of flanges  51 L is an integral multiple of the unit number n (here  8 ) as shown in  FIG. 12 ( a ) ( b ).  
      When flanges are successively designated as  51 L 1 ( 1 ) to  51 L 8 ( 8 ) from the side of the sliding direction X+ of the winding shaft, flanges  51 L 1 ( 1 ),  51 L 5 ( 5 ) have guide grooves  53 L 1 ,  53 L 5  (shown by hatched areas with dashed lines) in a zone of 0-90 degrees; flanges  51 L 2 ( 2 ),  51 L 6 ( 6 ) have guide grooves  53 L 2 ,  53 L 6  (shown by hatched areas with solid lines) in a zone of 90-180 degrees; flanges  51 L 3 ( 3 ),  51 L 7 ( 7 ) have guide grooves  53 L 3 ,  53 L 7  (shown by hatched areas with solid lines) in a zone of 180-270 degrees; and flanges  51 L 4 ( 4 ),  51 L 8 ( 8 ) have guide grooves  53 L 4 ,  53 L 8  (shown hatched areas with dashed lines) in a zone of 270-360 degrees in a rotating coordinate system (winding direction R is positive) as shown in the right side view.  
      By this arrangement of guide grooves, the centers of gravity of flanges  51 L themselves are as follows. For the centers of gravity of flanges  51 L, flanges  51 L 1   1 ( 1 ),  51 L 5 ( 5 ) are symmetrical to the flanges  51 L 3 ( 3 ),  51 L 7 ( 7 ) with respect to the winding axis and the flanges  51 L 2 ( 2 ),  51 L 6 ( 6 ) are symmetrical to the flanges  51 L 4 ( 4 ),  51 L 8 ( 8 ) with respect to the winding axis, so that the center of gravity of reel member  53 L as a whole is located on the winding axis.  
      Downstream guide edges  54 L 2 ,  54 L 4 ,  54 L 6  in the winding direction R of flanges  51 L 2 ( 2 ),  51 L 4 ( 4 ),  51 L 6 ( 6 ) on the feeding side are opposed at the same plane to upstream guide edges  54 L 3 ,  54 L 5 ,  54 L 7  in the winding direction R of flanges  51 L 3 ( 3 ),  51 L 5 ( 5 ),  51 L 7 ( 7 ) on the receiving side.  
      In the case of the present embodiment, guide edges  54 L 2 ,  54 L 4 ,  54 L 6  on the feeding side and guide edges  54 L 3 ,  54 L 5 ,  54 L 7  on the receiving side are further chamfered at a given angle to form bevels parallel to each other in order that the film cannot be folded when it is passed.  
      For example, guide edge  54 L 2  of flange  51 L 2 ( 2 ) has a guide bevel  58 L 2  downwardly inclined from the horizontal plane including the winding axis and guide edge  54 L 3  of flange  51 L 3 ( 3 ) has a guide bevel  58 L 3  upwardly inclined from the horizontal plane including the winding axis, as shown in  FIG. 13 ( a ), ( b ) and  FIG. 12 ( a ).  
      The other guide edges  54 L 4 ,  54 L 6  on the feeding side and guide edges  54 L 5 ,  54 L 7  on the receiving side are also designed in the same manner.  
      Referring now to  FIG. 14 , the bevel angles α of guide edges  54 L are explained.  
      When the film is passed from the outermost turn of the film wound around winding spool  52 L 1  to the next winding spool  52 L 2  via spacer spool  520 L 1 , such a film preferably follows a spiral curve on a specific cylindrical surface because it need be guided without folding.  
      In the case of the present embodiment, it will be described for the region including flanges  51 L 1  to  51 L 4 , and winding spools  52 L 1 ,  52 L 2  and spacer spool  520 L 1  between them in whole of the reel member  50 L. A virtual cylindrical surface C including lines L 2 , L 3  as the outermost generatrices and imaginarily integral with the side face of spacer spool  520 L provided that L 1  is the uppermost generatrix on a film  2  having a roll diameter D; L 2  is a line tangent to the floating part of the film  2  when it is passed from the intersection P 1  between the inner face of flange  51  L 1  and L 1 ; and L 3  is a line drawn from the intersection P 2  between the inner face of flange  51 L 4  and the lowermost generatrix on winding spool  52 L 2  in parallel with line L 2 .  
      Then, a trajectory of the film edge S 1  connecting the intersection P 1  with a point P 3  distant from the intersection P 2  by the film width on the line L 3  to form a spiral curve and a trajectory of the film edge S 2  connecting the intersection P 2  with a point P 4  distant from the intersection P 1  by the film width on the line L 2  to form a spiral curve are supposed on the virtual cylindrical surface C.  
      The bevel angle α 3  of flange  51 L 3  is determined in such a manner that guide bevel  58 L 3  may be tangent with the trajectory of the film edge S 2 . The bevel angle α 2  of flange  51 L 2  is the same as the bevel angle α 3  of flange  51 L 3 .  
      The bevel angles α 1 , α 4 -α 8  of the other flanges  51 L 1 ,  51 L 4 - 51 L 8  are also the same as the bevel angle α 3  of flange  51 L 3 .  
      Guide bevel  58 L 2  of flange  51 L 2  may be or may not be tangent with the trajectory of the film edge S 1  depending on the relation with the length d of spacer spool  520 L 1 .  
      When the length d 1  of spacer spool  520 L 1  is selected in such a manner that guide bevel  58 L 2  may not be tangent with the trajectory of the film edge S 1  as in the present embodiment, the film can be advantageously gently passed because the pitch angle of the spiral curve increases with the increased virtual cylindrical surface C along with a film-guiding space defined by the length d 1  of spacer spool  520 L 1 , upstream guide edge  54 L 2  of flange  51 L 2  and downstream guide edge  54 L 3  of flange  51 L 3  at an angle of 180 degrees with the upstream guide edge.  
      When the length d 2  (&lt;d 1 ) of spacer spool  520 L 1  is selected in such a manner that guide bevel  58 L 2  may be tangent with the trajectory of the film edge S 1  contrary to the present embodiment, the winding slack can be advantageously prevented by guiding both edges of the film simultaneously along guide bevel  58 L 3  of flange  51 L 3  and guide bevel  58 L 2  of flange  51 L 2  though the film is steeply passed because the film guiding space becomes smaller.  
       FIG. 15  is a front view showing a film package comprising a film wound around a reel member according to the present embodiment.  
      As shown in  FIG. 15 , this film package  70 C is obtained by applying a method for winding a film described below to a reel member  50 L according to the present embodiment wherein film  2  is passed in a curve close to a spiral curve in contact with guide bevels  58 L 3 ,  58 L 5  and  58 L 7 .  
      However, film  2  can be passed in a curve further closer to the trajectories of the film edge S 1 , S 2  if the end face of (unchamfered) guide edge  54 L or the side face of spacer spool  520 L at least in contact with film  2  is closer to virtual cylindrical surface C.  
       FIG. 16  shows a reel member according to the present embodiment disassembled into several components.  
      The reel member  50 L described above is integrally formed, but reel member  50 L according to the present embodiment can also be assembled from a plurality of components.  
      For example, a first component  501 L comprises flange  51 L 1  and winding spool  51 L 1 , a second component  502  comprises flange  51 L 8 , and a third component  503 L consists of flange  51 L 2  and flange  51 L 3  together with spacer spool  520 L 1  and winding spool  52 L 2 , and component  501 L and component  503 L are connectable to each other while component  503 L and component  502 L are connectable to each other, as shown in  FIG. 16 .  
      In such a reel member  50 L, the unit number n of flanges  51 L can be selected as any integral multiple by connecting components  501 L- 503 L with a phase shift of 90 degrees.  
      Guide grooves  53 L 1 ,  53 L 8  are formed in flanges  51 L 1 ( 1 ),  51 L 8 ( 8 ) in the present embodiment to evenly balance the weight, but they are basically unnecessary for passing a film.  
      Thus, flange  51 L without guide groove  53 L can be provided on each outer side of an array of any integral multiple of the unit number n of flanges  51 L having guide groove  53 L in order to evenly balance the weight and protect the film.  
      In carrying out a method for winding a film according to the present invention, a multistage winding system as shown below is used, for example. This multistage winding system is first explained with reference to the drawings.  
       FIG. 17  is a front view showing the outline structure of an example of a multistage winding system for carrying out a method for winding a film according to the present embodiment.  FIG. 18  is a left side view showing the outline structure of the multistage winding system.  
      As shown in  FIG. 17  or  FIG. 18 , multistage winding system  1  according to the present embodiment comprises a feeding apparatus  10  and a winding apparatus  20 .  
      Feeding apparatus  10  is designed to apply a given load on reel member  11  around which a given film  2  has been wound while reel member  11  is rotatably supported on feeding shaft  12 .  
      Reel member  11  of feeding apparatus  10  has the approximately same structure as those of reel members  50  according to the first to fifth embodiments described above except that the outer diameter of flange  13  is determined to be greater than the outer diameters of flanges  51  of the previous embodiments depending on the overall length of the insulating adhesive film or anisotropic conductive adhesive film.  
      Winding apparatus  20  comprises a winding mechanism  30 , a moving mechanism  40  and a controller  60 .  
      Winding mechanism  30  comprises a winding shaft  31  parallel to feeding shaft  12  of feeding apparatus  10 .  
      This winding shaft  31  is designed to be fitted into the through-hole in winding spool  51  of reel member  50  according to the embodiments described above with a slight gap, thereby supporting reel member  50  in such a manner that it can be axially moved while it is fixed against circumferential movement.  
      At one end of such winding shaft  31  is provided a driving member  32 . This driving member  32  is designed to transmit the power of a winding motor  32   c  comprising a stepping motor to a gear  32   a  fixed to winding shaft  31  through a train of gears  32   b  to rotate winding shaft  31 .  
      An encoder  32   d  is fixed to the driving shaft of winding motor  32   c  and a light reflective sensor  32   e  is provided near the encoder  32   d.    
      Such winding motor  32   c  and sensor  32   e  are electrically connected to controller  60 . This controller  60  is designed to count the number of pulses of winding motor  32   c  on the basis of signals from sensor  32   e  and to control the rotation of winding motor  32   c  on the basis of the number of pulses.  
      Moving mechanism  40  comprises a pair of driving shafts  41  having an external screw parallel to winding shaft  31  and a slide shaft  42 . At one end of driving shaft  41  is provided a driving member  43  having the same structure as that of the driving member of winding mechanism  30 . That is, this driving member  43  comprises a slide motor  43   b  rotating driving shaft  41  by transmitting power to a gear  43   a  on driving shaft  41  and a light transmissive sensor  43   d  capable of detecting an encoder  43   c  on driving shaft  41 . These slide motor  43   b  and sensor  43   d  are connected to controller  60  so that they are controlled in the same manner as winding mechanism  30 .  
      A moving plate  44  and a pressing plate  45  are mounted on these driving shaft  41  and slide shaft  42 . Moving plate  44  is screwed to driving shaft  41  and slidably engaged with slide shaft  42 . Pressing plate  45  is not screwed to driving shaft  41  and is designed to be biased toward moving plate  44  by a coil spring, not shown, while it is slidably engaged with only slide shaft  42 .  
      Both moving plate  44  and pressing plate  45  are in the form of e.g. a ring so that they may come into contact with only the outer periphery of flange  51  of reel member  50 .  
      Next, a preferred embodiment of a method for winding a film according to the present invention is explained referring to examples in which some of reel members  50 A to  50 L according to the first to tenth embodiments are applied to the multistage wining system  1  described above.  
       FIG. 19  to  FIG. 24  are left side views and front views showing how a film is wound around a reel member of the present invention according to a method for winding a film of the present embodiment.  
       FIG. 25 ( a ) is a left side view showing a film package according to the present embodiment and  FIG. 25 ( b ) is a front view showing the film package.  
      As shown in  FIG. 17 , a reel member  11  around which a film  2  has been wound is first mounted on a feeding apparatus  10  and e.g. a reel member  50 A according to the first embodiment is mounted on a winding apparatus  20 , and then reel member  50 A on the winding side is positioned with respect to reel member  11  on the feeding side in such a manner that the flange  51 A on the side of moving plate  44  of winding apparatus  20  (the rightmost flange in  FIG. 17 ) and the flange  13  at the right of feeding apparatus  10  (hereinafter referred to as “right flange  13   a ”) are coplanar.  
      Then, film  2  drawn from reel member  11  on the feeding side is wound around winding spool  51 A of reel member on the winding side. Here, flanges  51 A of reel member  50 A are designated as first flange  51 A 1 , second flange  51 A 2 , third flange  51 A 3  and fourth flange  51 A 4  successively from the right side and winding spools  52 A of reel member  50 A are designated as first winding spool  52 A 1  between first and second flanges  51 A 1 ,  51 A 2 , second winding spool  52 A 2  between second and third flanges  51 A 2 ,  51 A 3  and third winding spool  52 A 3  between third and fourth flanges  51 A 3 ,  51 A 4  as shown in  FIG. 1 ( a ) for convenience of explanation.  
      Under a command from controller  60  described above, winding motor  32 C is activated to start the rotation of winding shaft  31  and also start to count the number of pulses of winding motor  32 C.  
      Thus, reel member  50 A winds film  2  tensioned under a load from feeding apparatus  10  onto first winding spool  52 A 1  (see  FIG. 19 ( a ) ( b )).  
      Controller  60  stops the operation of winding motor  32   c  when it judges from the count of the number of pulses of winding motor  32   c  that the entry  2   b  of release film  2   a  at the point that the release film on the feeding side in contact with rolled film  2  on the winding side is on the point of entering into guide groove  53 A of second flange  51 A 2  after first winding spool  52 A 1  of reel member  50 A has finished winding adhesive film  2  and started to wind release film  2   a , as shown in  FIG. 20 ( a ) ( b ).  
      Under a command from controller  60 , slide motor  43   b  is operated for a time corresponding to a given number of pulses to rotate driving shaft  41 . Thus, reel member  50 A moves until second flange  51 A 2  reaches a distance over the position of right flange  13   a  on the feeding side along winding shaft  31 , as shown in  FIG. 21 ( a ) ( b ). In this case, release film  2   a  on the feeding side is twisted against rolled film  2  on the winding side so that release film  2   a  runs off from guide groove  53 A of second flange  51 A 2  to approach third flange  51 A 3 .  
      When reel member  50 A is rotated again in this state, second flange  51 A 2  catches release film  2   a  at guide edge  54 A, as shown in  FIG. 22 ( a ) ( b ).  
      As reel member  50 A rotates, it then winds release film  2   a  around second winding spool  52 A 2  while it is caught by second flange  51 A 2  and after a while, feeding of release film  2   a  is finished and the next adhesive film  2  is sent and wound, as shown in  FIG. 23 ( a ) ( b ).  
      Under a command from controller  60 , slide motor  43   b  is also operated to return reel member  50 A until second flange  51 A 2  becomes coplanar with right flange  13   a  on the feeding side.  
      Thus, reel member  50 A winds film  2  from the feeding side in parallel to second winding spool  52 A 2 , as shown in  FIG. 24 ( a ) ( b ).  
      Then, the winding operation as described above is also applied to third winding spool  52 A 3  of reel member  50 A.  
      Thus, a film package  70 A is obtained in which film  2  is wound around each winding spool  52 A with exposed parts of release film  2   a  of film  2  being passed from flanges  51 A to winding spools  52 A as shown in  FIG. 25 ( a ) ( b ) by applying the method for winding a film according to the present embodiment to reel member  50 A.  
       FIG. 27  to  FIG. 30  show how a film is wound around another reel member of the present invention according to the method for winding a film according to the present embodiment.  
      This method uses a reel member assembly comprising a plurality of reel members  50 K according to the ninth embodiment described above (hereinafter simply referred to as “reel member  50 K”).  
      The present embodiment is described below essentially about the effect resulting from the difference in shape between reel member  50 K and reel member  50 A, though the winding method itself is similar to the winding method using reel member  50 A according to the first embodiment described above.  
       FIG. 27 ,  FIG. 29  and  FIG. 30  correspond to  FIG. 22 ( a ),  FIG. 23 ( a ) and  FIG. 24 ( a ), respectively.  
      In the present embodiment, reel member  50 K itself is slid and then rotated when film  2  is on the point of entering into first guide groove  53 K after film  2  has been wound around one of winding spool  52 K, as shown in  FIG. 27 . Thus, film  2  comes into contact with guide edge  54 K while straddling flange  51 K.  
      As reel member  50 K is further rotated, film  2  moves into the direction in which the contact point  2   c  with guide edge  54 K toward first retaining groove  57 K, while unrolled part  2   d  of film  2  moves toward second retaining groove  57 K 2 , as shown in  FIG. 28 .  
      Then, film  2  is caught across the edges of two flanges  51 K while it touches the bottom of second retaining groove  57 K 2  and sinks in first retaining groove  57 K 1 , as shown in  FIG. 29 .  
      Then, film  2  is wound around the next winding spool  52 K while it is tensioned between first and second retaining grooves  57 K 1 ,  57 K 2 , as shown in  FIG. 30 .  
      Other embodiments of methods for winding a film according to the present invention are explained below.  
      For example, at least one empty winding spool  52  can be interposed between a winding spool  52  around which a film  2  has been wound and the next winding spool  52  around which film  2  is to be wound, i.e. the film  2  can be wound with an interval of one winding spool  52  according to the present invention, in order to protect the film from folding when it is passed over any of the reel members  50 A- 50 L according to the first to tenth embodiments.  
      According to such an arrangement, the film  2  can be passed between a flange  51  for drawing out the film  2  from a winding spool  52  around which the film  2  has been wound and a flange  51  for winding the film  2  around the next winding spool  52  at a gentler angle as compared with the case when the film  2  is wound around all winding spools  52 .  
      However, this method is preferably applied to reel member  50 F according to the sixth embodiment described above.  
      In this case, film  2  is passed against the curved surface in guide groove  53 F of flange  51  and wound around the next winding spool  52 F after it is sunk in retaining groove  57 F in guide groove  53 F of another flange  51 F next but one winding spool  52 F.  
      Thus, a film package  70 B is obtained in which film  2  is passed at a gentler angle as shown in  FIG. 26  by applying the method for winding a film called skipping method described above to reel member assembly formed of a plurality of reel members  50 F connected to each other.  
      According to another embodiment of a method for winding a film, a film can be wound with a reel member having a spacer for passing the film between winding spools on the feeding side and receiving side in order to smoothly pass the film without folding.  
      In this case, reel member  50 L according to the tenth embodiment shown in  FIG. 12 ( a ) is preferably used, for example, in order to evenly balance the weight.  
      When this reel member  50 L is used, it is necessary to shift the timing of passing the film, i.e. the timing of sliding each winding spool  52 L by 90 degrees.  
      According to another embodiment of a method for winding a film wherein reel member  50 A according to the first embodiment shown in  FIG. 1  is applied to the multistage winding system  1  described above, the rotation of reel member  50 A can be stopped when entry  2   b  of release film  2   a  on the feeding side approaches guide edge  54 A of second flange  51 A 2  at the stage when adhesive film  2  has been wound around first winding spool  52 A 1 . Following treatments are similar to the above-described method of winding.  
      In this case, release film  2   a  is caught at guide edge  54 A of second flange  51 A 2  while reel member  50 A is axially moved after the rotation of reel member  50 A is stopped.  
      In the case where any one of reel members  50 B,  50 C or  50 E according to the second, third or fifth embodiment shown in  FIG. 3 ,  FIG. 4 ( a ) ( b ) or  FIG. 6 ( a ) ( b ) is applied to the multistage winding system  1  described above, the shape and size of each guide groove  53 B,  53 C,  53 E are different as compared with the case where reel member  50 A according to the first embodiment is applied.  
      Therefore, the timing of stopping the rotation of reel member  50  must be changed when reel members  50 B,  50 C,  50 E according to these second, third and fifth embodiments are used.  
      However, the other operations are similar to those of the first embodiment, e.g. release film  2   a  is transferred through guide groove  53  in second flange  51  to second winding spool  52  and then wound around it by catching it at its guide edge  54  or release film  2   a  is transferred to second winding spool  52  by catching it at guide edge  54  of second flange  51  and then wound around it at the stage when adhesive film  2  has been wound up around first winding spool  52 .  
      When reel member  50 D according to the fourth embodiment shown in  FIG. 5 ( a ) ( b ) is applied to the multistage winding system  1  described above, the range of the timing of stopping the rotation of reel member  50 D can be wider as compared with the previous embodiments because release film  2   a  can be caught at guide edge  54 D of engaging projection  56 D after it is slid on the outer periphery of each flange  51 D as it rotates.  
      The present embodiment is similar to the previous embodiments in that release film  2   a  is passed at the periphery of engaging projection  56 D of each flange  51 D and caught at guide edge  54 D.  
      According to still another embodiment of a method for winding a film, reel member  50  can be continued to rotate during axial movement of reel member  50  more slowly than during winding.  
      In this case, the rotation speed of reel member  50  is determined consideration that release film is passed through guide groove  53  in each flange  51  or release film  2   a  is caught at guide edge  54  of each flange.  
      According to still another embodiment of a method for winding a film using any of reel member  50 G,  50 H according to the seventh or eighth embodiment shown in  FIG. 9  or  10 , a film has been wound around one winding spool  52  and then can be retained near the winding spool  52  by dropping it in retaining groove  57  along guide edge  54  of flange  51 .  
      According to the seventh embodiment, the film is wound around winding spool  52 G while it is in contact with the edge of retaining hole  57 G 2  under tension with the position being changed in retaining hole  57 G 2  because it is blocked by anchor  57 G 3  and thereby restrained from movement in retaining hole  57 G 2  as reel member  50 G rotates.  
      According to the eighth embodiment, the film is fixed at the bottom of retaining groove  57 H and by interposing between the inner walls of retaining groove  57 H and wound around winding spool  52 H while it is tensioned from this fixed part as reel member  50 H rotates.  
      In the present invention, retaining grooves  57 G,  57 H in these reel members  50 G,  50 H as well as retaining grooves  57 F,  57 K in the previous reel members  50 F,  50 K can be used not only to automatically retain the film to flange  51  when it is wound at multiple stages but also these retaining grooves  57  can be used to retain the film to flange  51  when the film is manually passed though only the step of winding that the film is automatically performed.  
      When the film is manually passed, however, retaining groove  57  alone suffices without guide groove  53  because guide groove  53  in flange  51  is not required to perform the original function of automatically passing the film but merely required as a working hole for affixing the head of a film to winding spool  52  or inserting the film into retaining groove  57 .  
      In the present invention, therefore, retaining groove  57  is included in the concept of guide groove  53  so far as they are broadly common in passing the film over flange  51 . For example, reel members  50 F,  50 G,  50 H may not be provided with guide groove  53  but retaining groove  57  alone as “guide groove” and reel member  50 K may be provided with retaining groove  57  including the shape of guide groove  53  as “guide groove”.  
      According to the embodiment described above, a long film can be wound at multiple stages within such a diameter that adhesive cannot be squeezed out of the film because the adhesive film is wound around winding spool  52  of reel member  50  and then the rotation of reel member  50  is stopped (or slowed), after which reel member  50  is axially moved, whereby winding of the film around the next winding spool  52  can be smoothly started, after as described above.  
      A long film can be more effectively wound at multiple stages by using reel members  50  shown in the first to tenth embodiments when the present embodiment of film winding method is carried out.  
      According to the first to third and fifth to tenth embodiments wherein each flange  51  has guide groove  53 , a film is passed through guide groove  53  at the stage when the film has been wound up around a one of winding spool  52  so that the film can be smoothly moved to the next winding spool  52 .  
      Especially, a film can be wound around the next winding spool  52  without slack by catching the film at the edge (guide edge) of guide groove  53  according to the first to third and fifth embodiments or by catching the film while it is retained in retaining groove  57  according to the sixth to ninth embodiments.  
      Guide groove  53  in flange  51  also has the advantage that a film can be wound without running off the outer periphery of each flange  51  or the length of film (release film) to be passed from one winding spool  52  to the next winding spool  52  can be reduced by extending guide groove  53  to the vicinity of winding spool  52  as in the second, third, fifth and ninth embodiments or extending the retaining groove to the vicinity of the winding spool as in the seventh and eighth embodiments.  
      The fourth embodiment having projection  56  on each flange  51  has the advantage that not only a film can be smoothly moved from one winding spool  52  to the next winding spool or caught at projection  56  but also the range of the timing of performing this can be wider.  
      According to the second to ninth embodiments wherein reel members  50  are axially connectable to each other, a long film can be handled as appropriate by adjusting the number of reel members  50  depending on the length of the film.  
      According to the first to ninth embodiments wherein each guide groove  53  or each projection  56  is provided at the same position on the periphery of flange  51 , the film can be axially moved or caught at the same timing between flanges  51 .  
      According to the sixth embodiment wherein flange  51  has a certain thickness and guide groove  53  has a curved inner surface along which the film is passed, the film can be prevented from folding when it is passed.  
      Especially when a film winding method called skipping method is applied to such a reel member  50 , the film can be more effectively prevented from folding.  
      According to the sixth to ninth embodiments wherein retaining groove  57  is formed on guide edge  54  of guide groove  53  to automatically retain the film at flange  51 , the film can be prevented from slacking when it is passed.  
      Especially according to the ninth embodiment wherein not only the film to be wound around winding spool  52  but also the outer part of the already wound film can be retained, the film can be more effectively prevented from slacking.  
      The sixth to ninth embodiments are advantageously suitable for winding a thin film because a minimum necessary tension can be applied to the film once the film is retained in retaining groove  57  though even the first to fifth embodiments can prevent slacking of a film by winding the film around winding spool  52  while it is caught at a corner or the bottom of guide groove  53  provided that a certain amount of tension must be continuously applied to the film so that the film cannot be moved from the part of guide groove  53  at which it is caught.  
      According to the eighth and ninth embodiments wherein the center of gravity of flange  51  itself is located on winding spool  52 , the film can be evenly wound under a necessary minimum tension because reel member  50  having such a flange  51  in its structure can be rotated at a constant moment of rotations.  
      The film package  70  comprising such a reel member  50  around which a film has been wound can be delivered in various forms because it is stable with the center of gravity as a whole being located on winding spool  52 .  
      According to the tenth embodiment, a long film can be wound always at a constant moment of rotations by evenly balancing the weight of reel member  50 L and the long film can be wound without folding by spirally guiding and smoothly passing it, with the result that a film package  70 C containing a film without creases (without waste) can be provided to clients.  
      Especially in this embodiment, the length of the film that can be wound at multiple stages can be further increased while maintaining an even weight balance by increasing the number of winding spools  52 L and flanges  51 L per a unit number n determined in terms of the weight balance.  
      When a film of  50 m is wound around a winding spool  52 L, for example, the length of the film that can be wound with reel member  50 L is a unit number n (=4) multiplied by an integer N, i.e. 200×N meters (“x” means multiplication).  
      It is apparent from the foregoing description that the present invention is adaptable for winding a long adhesive film at multiple stages in such a diameter that adhesive cannot be squeezed out and a reel member that can be applied to this method can be obtained.