JP2010215338A - Tubular body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve tensile strength in the direction crossing the orientation of reinforcing fiber, which has been aligned in one direction, of a prepreg sheet. <P>SOLUTION: Glass fiber 15 orthogonally crossing the orientation of carbon fiber 13a is provided on a reinforced fiber sheet 13 comprised of the carbon fiber 13a, as reinforcing fiber, which has been aligned in one direction to form a sheet. The prepreg sheet 11 is wound on a core material 23 while having the direction of the glass fiber 15 crossing the axial direction of the core material 23. Since this prepreg sheet 11 has been provided with the glass fiber 15, the prepreg sheet 11 has an improved tensile strength in the same direction as the orientation of the glass fiber 15. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a tubular body formed by winding a prepreg sheet impregnated with a matrix resin on a reinforcing fiber sheet around a surface of a core material to be released.

  Conventionally, tubular bodies used as industrial rolls such as transport rolls and take-up rolls for papermaking, paper for printing machines, films, etc. are usually rotated at a high speed with the transport and take-up of films, etc. It is preferable to have a bending strength that can withstand high-speed rotation and to be lightweight so as to reduce rotational inertia.

  In recent years, with the increase in size of films and the like, the length of industrial rolls has increased, and a long tubular body has been demanded. The long tubular body has a problem that it is bent due to its own weight or the weight of the wound film or the like, and the wound film or the like is wrinkled.

  In order to eliminate such problems, a tubular body made of fiber reinforced plastic (FRP) having characteristics such as light weight, high rigidity, and high strength is used as compared with a metallic pipe body. The tubular body made of FRP is formed by winding a prepreg sheet impregnated with a reinforcing resin and a matrix resin around the surface of a core material to be released.

  When an FPR tubular body is used as the industrial roll, it is necessary to smooth the surface, and therefore, a surface that has been subjected to grinding and then subjected to metal plating has been proposed. (For example, refer to Patent Document 1).

JP 2003-321163 A

  The prepreg sheet described in Patent Document 1 is a sheet in which reinforcing fibers are aligned in one direction to form a sheet, and the reinforcing fiber sheet is impregnated with a matrix resin and cured to the B stage. By winding the prepreg sheet around the core material in a state where the orientation of the reinforcing fibers is aligned in the axial direction of the core material, the axial direction of the tubular body and the orientation of the reinforcing fibers become the same direction.

  When the reinforcing fibers are oriented in this way, when the load perpendicular to the axial direction is received by the weight of the film or the like wound around the tubular body, the load can be received by the reinforcing fibers. The occurrence of bending can be suppressed.

  Furthermore, the prepreg sheet is wound around the core material at an angle that intersects so that the orientation of the reinforcing fiber is inclined with respect to the axial direction of the core material, and is laminated to increase the strength against twisting as well as bending of the tubular body. The rigidity of the tubular body can be improved.

  By the way, when forming the tubular body, the prepreg sheet described in Patent Document 1 is wound in a state in which tension is applied in a direction orthogonal to the axial direction of the core material in order to closely contact the surface of the core material. There is. At this time, when the prepreg sheet is wound in a state in which the orientation of the reinforcing fibers is aligned with the axial direction of the core material, the tension direction applied to the prepreg sheet is a direction orthogonal to the orientation of the reinforcing fibers.

  Therefore, the prepreg sheet does not sufficiently exhibit the mechanical strength due to the reinforcing fibers in the tension direction, and the mechanical strength (particularly, tensile strength) is insufficient. For this reason, a part of the prepreg sheet to which tension is applied may be torn or torn, making it difficult to wind around the core material, making it difficult to make the prepreg sheet adhere to the surface of the core material .

  Then, the subject of this invention is improving the tensile strength of the direction which cross | intersects with the orientation of the reinforced fiber aligned in one direction of the prepreg sheet.

In order to solve the above problems, the present invention provides a tubular body formed by winding a prepreg sheet impregnated with a matrix resin into a reinforcing fiber sheet made of reinforcing fibers around a core material to be released. The reinforcing fiber sheet is made of carbon fibers that are aligned in one direction to form a sheet, and the prepreg sheet includes glass fibers that are aligned in one direction and intersect the orientation of the carbon fibers, and the glass fibers. A configuration is adopted in which the core is wound around the core material in a state where the orientation is crossed with respect to the axial direction of the core material.
Here, the fibers such as carbon fiber and glass fiber are structural units such as yarns and woven fabrics defined in JIS, which are thin and flexible with sufficient length compared to the thickness.

  According to this structure, since the glass fiber which cross | intersects with respect to the orientation of a carbon fiber is provided in the prepreg sheet | seat, the tensile strength with respect to the orientation of a glass fiber improves. The prepreg sheet with improved tensile strength can be wound around the core while applying tension in a direction intersecting the axial direction of the core, that is, in the same direction as the orientation of the glass fibers. Therefore, like the above-described conventional tubular prepreg sheet, when wound around the core material, it is possible to make it adhere to the surface of the core metal without being partially broken.

  When adopting a configuration in which the reinforcing fiber sheet is provided with glass fibers, means for providing the glass fibers on the reinforcing fiber sheet include various types such as those in which the glass fibers are woven into the reinforcing fiber sheet or those in which the glass fibers are knitted. Though conceivable, for example, a configuration in which the glass fiber is sewn with respect to the reinforcing fiber sheet can be employed. Further, in the case of using a knitting yarn made of polyester fiber to keep the carbon fiber in a sheet shape, the glass fiber is integrally knitted together with the carbon fiber so that the glass fiber is provided in the reinforcing fiber sheet. can do.

  In the prepreg sheet provided with glass fibers, a configuration provided on the prepreg sheet in a state where the glass fibers are impregnated with the matrix resin can be adopted. If it does in this way, since a prepreg sheet can be formed by impregnating a reinforcing fiber sheet made of carbon fiber in advance with a matrix resin, a conventional prepreg sheet can be utilized.

  In these configurations, it is possible to employ a configuration in which the glass fibers are provided at a plurality of locations at intervals in the same direction with respect to the orientation of the carbon fibers. If it does in this way, when the same direction is made into the width direction with respect to the orientation of carbon fiber, a glass fiber will be provided in multiple places at intervals in the width direction. For this reason, the tensile strength in the same direction as the orientation of the glass fiber is increased in a wider width, the width that can be wound around the core material can be increased, and a longer tubular body can be obtained. .

  In the case of a thermosetting resin, an unsaturated polyester resin or a vinyl ester resin is preferable as the matrix resin impregnated into the reinforcing fibers of the prepreg sheet. These resins, compared with epoxy resins commonly used as matrix resins, have poor adhesive strength between the reinforcing fibers and the resin, but have a fast curing speed and can form a tubular body in a short time. This is because.

  As described above, according to the present invention, since the prepreg sheet is provided with glass fibers aligned in one direction, the tensile strength in the same direction as the direction of the glass fibers is improved, and the direction of the glass fibers is changed to the prepreg sheet. The core material can be wound while tension is applied in a state intersecting the axial direction of the core material, and the surface can be finished smoothly.

The perspective view which shows the tubular body of 1st Embodiment. (A) Front view showing prepreg sheet same as above, (b) Cross section taken along line A-A in FIG. The front view which shows the prepreg sheet | seat of the other aspect same as the above (A) The front view which shows the modification of a prepreg sheet | seat same as the above, (b) Sectional drawing in BB in Fig.4 (a) The front view which shows the prepreg sheet | seat of the other aspect same as the above Schematic showing the prepreg sheet winding device same as above The front view which shows the state which shape | molded the flat wound layer of the tubular body same as the above Front view showing the forming process of the spirally wound layer of the tubular body same as above (A) Front view showing prepreg sheet of second embodiment, (b) Cross-sectional view taken along line AA in FIG. The front view which shows the prepreg sheet | seat of the other aspect same as the above

A first embodiment of the present invention will be described below with reference to FIGS.
In the tubular body 10 of this embodiment, the prepreg sheet 11 is wound in a plurality of layers in a cylindrical shape while applying tension to the surface of the core material, heated and pressurized to cure the prepreg sheet 11, and the core material is extracted (demolded). ) (See FIG. 1).

  As the prepreg sheet 11, as shown in FIGS. 2A and 2B, a reinforced fiber sheet 13 impregnated and dried with a matrix resin 14 and cured to the B stage can be used.

  As shown in FIG. 2 (a), the reinforced fiber sheet 13 serving as the base material of the prepreg sheet 11 has carbon fibers 13a as reinforcing fibers that are aligned in one direction and are orthogonal to the orientation. It is knitted with polyester fiber 13b in the direction.

  The knitting yarn made of the polyester fiber 13b is provided over the entire length of the reinforcing fiber sheet 13 when the length direction is perpendicular to the orientation of the carbon fiber 13a. Moreover, when the orientation of the carbon fibers 13a is the width direction, the carbon fibers 13a are provided at a plurality of locations at intervals in the width direction.

  As shown in FIG. 2B, glass fibers 15 are provided on the surface of the reinforcing fiber sheet 13 in one direction and perpendicular to the orientation of the carbon fibers 13a. The glass fibers 15 are arranged at a plurality of locations on the surface of the reinforcing fiber sheet 13 at intervals in the width direction. The glass fiber 15 is integrally knitted by a knitting yarn made of polyester fiber 13b together with the carbon fiber 13a, and is integrated with the carbon fiber 13a.

  Although this glass fiber 15 should just be orientated in the direction which cross | intersects with the orientation of the carbon fiber 13a, the said orthogonal direction where tensile strength becomes the lowest among the prepreg sheets 11 by orienting in an orthogonal direction. The tensile strength at can be improved.

  Moreover, when the glass fiber 15 is provided in several places, the tensile strength in the same direction as the orientation of the glass fiber 15 will be raised for the prepreg sheet 11 in the wider range of the said width direction. For this reason, the width | variety which can be wound around a core material can be made wide, and it becomes possible to obtain the elongate tubular body 10. FIG.

  Here, the carbon fibers 13a, the polyester fibers 13b, and the fibers of the glass fibers 15 of the reinforcing fiber sheet 13 are structural units such as yarns and woven fabrics defined in JIS, and have a sufficient length compared to the thickness. It means thin and flexible.

  Further, as the carbon fiber 13a of the reinforcing fiber sheet 13, one having a small specific gravity and excellent in specific strength and specific elastic modulus is suitable, and the fineness, the number of filaments and the total fineness of the single fiber are the standards of the tubular body, It is set based on the use or mechanical strength required for the tubular body.

  Furthermore, the glass fiber 15 is not particularly limited as long as it has a tensile strength that can withstand the tension applied to the prepreg sheet 11 when the prepreg sheet 11 is wound around the core material, but it is more than the average thickness of the carbon fibers 13a. Small ones are preferred. In this case, the unevenness on the surface of the reinforcing fiber sheet 13 provided with the glass fibers 15 can be reduced.

  The reinforced fiber sheet 13 provided with the glass fibers 15 is impregnated and dried with the matrix resin 14 and cured to the B stage, whereby the prepreg sheet 11 is manufactured.

  As the matrix resin 14 impregnated in the reinforcing fiber sheet 13, a thermosetting resin can be applied, but an unsaturated polyester resin or a vinyl ester resin is preferable. Although these resins have a lower adhesive strength between the reinforcing fiber and the resin than epoxy resins that are generally applied as matrix resins, they have a high curing rate and can form a tubular body in a short time. This is because it is possible.

  In the reinforcing fiber sheet 13, as shown in FIG. 3, the sheet-like carbon fibers 13 a can be knitted with polyester fibers 13 b inclined in a direction intersecting with the orientation. In this case, the glass fiber 15 is provided in parallel with the knitting yarn composed of the polyester fiber 13b.

  When the orientation of the polyester fiber 13b is the same direction as the length direction of the reinforcing fiber sheet 13, the prepreg sheet 11 made of the reinforcing fiber sheet 13 is carbonized when being wound spirally around a mandrel 23 described later. The orientation of the fibers 13a is made parallel along the axial direction of the mandrel 23 (see FIG. 8).

  When the prepreg sheet 11 is wound in this state, the orientation of the carbon fibers 13a of the tubular body 10 to be formed becomes parallel along the axial direction of the mandrel 23, so that the tensile strength in the tube axial direction can be ensured. .

  The reinforcing fiber sheet 13 can be appropriately changed as long as it can receive a tension applied when the prepreg sheet 11 based on the reinforcing fiber sheet 13 is wound around the core material. As an example, a prepreg sheet 11 having a deformed reinforcing fiber sheet 13 as a base material is shown in FIGS. In the following, differences from the above-described configuration of the reinforcing fiber sheet 13 will be mainly described, and the same reference numerals will be used for the same configuration.

  The reinforcing fiber sheet 13 in this modification is provided by sewing the glass fibers 15. That is, the glass fiber 15 is sewn in a direction orthogonal to the orientation of the carbon fiber 13a (parallel to the orientation of the polyester fiber 13b).

  The sewn glass fibers 15 are provided at a plurality of locations at intervals in the width direction of the reinforcing fiber sheet 13 (see FIG. 4A). The length of the seam of the glass fiber 15 and the interval between the seams are appropriately set according to the standard and use of the tubular body 10.

  Also in this modified example, as shown in FIG. 5, the reinforcing fiber sheet 13 is a sheet-like carbon fiber 13a knitted by polyester fibers 13b inclined in a direction intersecting with the orientation. It can be. Also in this case, like the reinforcing fiber sheet 13 shown in FIG. 3, the orientation of the glass fiber 15 is provided in parallel with the knitting yarn made of the polyester fiber 13b. When the prepreg sheet 11 made of the reinforcing fiber sheet 13 is spirally wound around a mandrel 23 described later, the orientation of the carbon fibers 13a is parallel to the axial direction of the mandrel 23 (see FIG. 8). ).

The tubular body 10 of this embodiment is generally formed by winding a prepreg sheet 11 around a core material by a sheet winding method, and extracting the core material after heating.
FIG. 6 shows an example of an apparatus used in the sheet winding method. That is, as shown in FIG. 6, the sheet winding apparatus 20 includes two support rollers 21 and 22 that are rotationally driven, and a mandrel 23 as a core material is placed on the two support rollers 21 and 22. Rotate.

  The rotating mandrel 23 is supplied with the prepreg sheet 11 made of the reinforcing fiber sheet 13 shown in FIG. 2A that has been wound around the supply roller 24 in advance, and the prepreg sheet 11 is pressed by the pressing roller 25 to the outer periphery of the mandrel 23. Press against the surface. The prepreg sheet 11 is supplied in a state where the orientation of the carbon fibers 13 a is parallel to the axial direction of the mandrel 23 (a state where the orientation of the glass fibers 15 is perpendicular to the axial direction of the mandrel 23).

  Since the prepreg sheet 11 in this state is brought into close contact with the surface of the mandrel 23, tension is applied in that direction by pulling the supply roller 24 in the same direction as the orientation of the glass fibers 15. At this time, since the prepreg sheet 11 is provided with the glass fibers 15 in the tension direction, the tensile strength is improved, and the prepreg sheet 11 can be wound around the mandrel 23 while being in close contact with the surface of the mandrel 23. It becomes.

  The laminated flat wound layer 31 is formed by the prepreg sheet 11 wound around the mandrel 23 by the winding method (see FIG. 7). Thereafter, as shown in FIG. 8, the prepreg sheet 11 made of the reinforcing fiber sheet 13 shown in FIG. 3 is spiral (also called helical), and the axial direction of the mandrel 23 and the carbon fibers 13a of the prepreg sheet 11 are parallel to each other. The second spiral wound layer 32 is formed outside the flat wound layer 31.

  Also in the formation of the spirally wound layer 32, the prepreg sheet 11 can be tensioned in that direction by pulling in the same direction as the orientation of the glass fiber. Thereafter, the flat wound layer 31 and the spirally wound layer 32 are alternately formed until the required thickness is obtained.

  Further, the mandrel 23 on which the flat wound layer 31 and the spirally wound layer 32 are formed by the prepreg sheet 11 is subjected to heat treatment, and then the mandrel 23 is removed, whereby the tubular body 10 shown in FIG. 1 is formed. In the tubular body 10, the flat wound layer 31 and the spiral wound layer 32 are formed. However, for example, the spiral wound layer 32 may be formed on the inner side and the flat wound layer 31 may be formed on the outer side. Moreover, you may form in the structure of 3 or more layers which laminated | stacked the flat winding layer 31 and the spiral winding layer 32 alternately.

  When the flat wound layer 31 is formed, the prepreg sheet 11 made of the reinforcing fiber sheet 13 in the modified example shown in FIG. 4A is shown in FIG. The prepreg sheet 11 made of the reinforcing fiber sheet 13 in the modified example can also be used.

A second embodiment of the present invention is shown in FIGS. 9 (a), 9 (b), and 10. FIG.
In the tubular body according to the second embodiment, the glass fiber 15 provided in the prepreg sheet 11 is provided in the prepreg sheet 11 in which the reinforcing fiber sheet 13 is impregnated with the matrix resin 14 instead of being provided in the reinforcing fiber sheet 13. Yes. The configuration other than the position where the glass fiber 15 is provided with respect to the prepreg sheet 11 is the same as that of the first embodiment, and the same configurations as those of the first embodiment are denoted by the same reference numerals. The description is omitted.

  The reinforcing fiber sheet 13 in this embodiment is a sheet-like carbon fiber 13a that is aligned in one direction and is knitted with polyester fibers 13b in a direction orthogonal to the orientation of the carbon fiber 13a. The reinforced fiber sheet 13 is impregnated with the matrix resin 14 to form the prepreg sheet 11.

  As shown in FIG. 9B, glass fibers 15 impregnated with a matrix resin, for example, an unsaturated polyester resin or a vinyl ester resin, are provided on the surface of the prepreg sheet 11.

  The glass fibers 15 are aligned in one direction and provided in a direction orthogonal to the orientation of the carbon fibers 13a of the reinforcing fiber sheet 13, and are arranged at a plurality of locations in the same direction (width direction) as the orientation of the carbon fibers 13a. ing.

  Since the glass fiber 15 is provided on the prepreg sheet 11, the prepreg sheet 11 can be formed by impregnating the reinforcing fiber sheet 13 made of the carbon fiber 13 a with the matrix resin 14 in advance. Can be used.

  Further, in this embodiment, the reinforcing fiber sheet 13 is knitted by polyester fibers 13b inclined in a direction in which the sheet-like carbon fibers 13a intersect the orientation as shown in FIG. can do. In this case, the glass fiber 15 is provided in parallel with the knitting yarn composed of the polyester fiber 13b.

  When the orientation of the polyester fiber 13b is the same direction as the length direction of the reinforcing fiber sheet 13, as in the case of the first embodiment, when the prepreg sheet 11 is spirally wound around the mandrel 23, The orientation of the carbon fibers 13 a is parallel along the axial direction of the mandrel 23.

  By winding in this way, the orientation of the carbon fibers 13a becomes parallel along the width direction of the mandrel 23, and the tensile strength in the tube axis direction of the tubular body 10 can be ensured.

DESCRIPTION OF SYMBOLS 10 Tubular body 11 Prepreg sheet 13 Reinforcement fiber sheet 13a Carbon fiber 13b Polyester fiber 14 Matrix resin 15 Glass fiber 20 Sheet winding device 21, 22 Support roller 23 Mandrill 24 Supply roller 25 Press roller 31 Flat wound layer 32 Spiral wound layer

Claims (6)

In a tubular body formed by winding a prepreg sheet impregnated with a matrix resin into a reinforcing fiber sheet and wound around a core material to be released,
The reinforcing fiber sheet is composed of carbon fibers that are aligned in one direction to form a sheet, and the prepreg sheet includes glass fibers that are aligned in one direction and intersect the orientation of the carbon fibers, and the glass. A tubular body which is wound around the core material in a state in which the orientation of fibers intersects the axial direction of the core material.   2. The tubular body according to claim 1, wherein the glass fiber is provided on the reinforcing fiber sheet.   The tubular body according to claim 2, wherein the glass fiber is provided by knitting the reinforcing fiber sheet.   The tubular body according to claim 1, wherein the glass fiber is provided on the prepreg sheet in a state of being impregnated with the matrix resin.   The tubular body according to any one of claims 1 to 4, wherein the glass fibers are provided at a plurality of locations at intervals in the same direction with respect to the orientation of the carbon fibers.   The tubular body according to any one of claims 1 to 5, wherein the matrix resin is an unsaturated polyester resin or a vinyl ester resin.

Images