JP2007314313A - Cylindrical body and acrylic fiber package - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cylindrical body which prevents winding tightening of fiber even when the fiber is wound around the cylindrical body and stored for a long period, is not broken even when vibration occurs during transportation and is suitable for winding up large amount of thin fiber, and an acrylic fiber package preventing winding collapse and winding tightness and having excellent storage stability and transportation resistance. <P>SOLUTION: In this cylindrical body for winding up fiber, when acrylic fiber is wound around the cylindrical body by 4×10<SP>-5</SP>kg/dtex so as to form a package shape and is left to stand for three days in this state, the maximum deformation ratio of inner diameter of a cylindrical body central part is set to be 0.1 to 1%. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a cylinder for winding a large amount of acrylic fiber and stabilizing it to the next process, and to a package of acrylic fiber wound around the cylinder.

Fibers are widely used in various applications such as medical, sports and general industrial applications. In order to respond quickly to a wide variety of demands for a wide range of applications, it is necessary to provide a large amount of inexpensive fibers, such as by reducing manufacturing costs, producing multiple types of products, and performing integrated production up to the final product. . Until now, many technologies for improving performance have been proposed, but there have been few proposals for reducing manufacturing costs and transporting overseas (long-term storage).

  Various fibers are intermediate products, and it is important to transport them in large quantities to the next process in order to reduce manufacturing costs. However, in the case of a conventional cylinder, when a large amount of wound fiber is transported, the cylinder may be distorted due to vibration during transportation and the weight of the fiber, and the roll may be collapsed.

  In this regard, it has been proposed that a tubular body made of fiber reinforced plastic can be used without deformation of the tubular body even when the package weight is 100 kg or more (see, for example, Patent Document 1). However, even if the cylindrical body can be prevented from being deformed immediately after winding, when a fine fiber with a total fineness of 5000 dtex is wound up, the cylindrical body is caused to become radial due to the tensile residual stress as time passes after production. It may shrink. When such shrinkage occurs, there is a problem in that, when a cylinder wound with fibers is placed on the carriage of the next process, a part of the cylinder is contracted, resulting in a defective device. If the winding tension is weakened to avoid such shrinkage, the winding density of the package itself will be reduced, and the winding will change due to the thread weight. A problem occurs.

In addition, a cylinder having high shock absorption and mechanical properties has been proposed by laminating and curing a high-strength, high-modulus film layer and a fiber-reinforced thermosetting resin layer (see, for example, Patent Document 2). However, the diameter of the cylinder is very thin, about 10mm. To that end, the spindle shaft of the winder or the cylinder installation device in the next process becomes thin. It is necessary to increase the strength and the like, and this has a huge cost in equipment cost.
JP-A-11-263534 Japanese Patent Laid-Open No. 03-161321

  An object of the present invention is to provide a cylindrical body that is small in deformation due to tightening after winding a fine fiber, and an acrylic fiber package that uses the cylindrical body and that does not collapse.

The cylinder of the present invention has the following configuration in order to solve the above problems. That is, the cylindrical body of the present invention is a cylindrical body for winding a fiber, on which acrylic fiber is wound in a package shape at 4 × 10 ⁻⁵ kg / dtex or more and left in that state for 3 days. In this case, the maximum deformation rate of the inner diameter of the minimum cylindrical portion is 0.1% to 1%. The cylindrical body of the present invention preferably has a Charpy impact value of 0.8 × 10 ⁴ kJ / m ² or more. Moreover, it is preferable that the cylinder of the present invention has a bending strength of 150 MPa or more. The cylinder of the present invention preferably has an inner diameter of 100 mm or more and a cylinder length of 500 mm or more. The cylinder of the present invention is preferably made of fiber reinforced plastic.

  Moreover, it is preferable that the package of this invention is an acrylic fiber package formed by winding up the acrylic fiber whose total fineness is 5000 dtex or less to the cylinder of this invention.

  Since the cylindrical body of the present invention is difficult to be deformed even when a thin fiber is wound up, it is suitably used even when it receives vibration when transporting the package or when it takes time to transport it far away. It is a cylinder that can. Moreover, since it is hard to deform | transform, it is a reusable cylinder. Furthermore, even after transportation or after long-term storage, it is possible to provide an acrylic fiber package having a good winding shape that is unlikely to cause winding collapse or roller wrapping when the acrylic fiber is pulled out.

The present invention is an invention of a cylindrical body, in which an acrylic fiber is wound around the cylindrical body in a package shape at 4 × 10 ⁻⁵ kg / dtex or more and left in that state for 3 days. A cylindrical body having a maximum deformation ratio of the inner diameter of the central portion of 0.1 to 1.0%.

More preferably, it is 5 × 10 ⁻⁵ to 1 × 10 ⁻⁴ kg / dtex, and more preferably 6 × 10 ^{−5 to} 9 × 10 ⁻⁵ kg / dtex, and the acrylic fiber is wound into a package, In this state, the cylindrical body has a maximum deformation ratio of 0.1 to 1% at the inner diameter of the central portion of the cylindrical body.

  Here, the maximum deformation rate of the inner diameter of the central part of the cylinder is the maximum deformation rate in the central part of the cylinder, that is, (inner diameter of the cylinder before winding-inner diameter of the center of the cylinder after 3 days of winding) / cylinder before winding. Body inner diameter x 100 (%). If the maximum deformation rate inside the central part of the cylinder exceeds 1%, for example, when the fiber is pulled out from the package in the next process, the clearance between the cylinder inner diameter of the package and the spindle shaft becomes too small. It takes time to insert and remove from the shaft, and work efficiency becomes extremely poor. On the other hand, the smaller the maximum deformation rate, the better. However, if it is less than 0.1%, there is almost no problem in work efficiency.

The cylinder of the present invention preferably has a Charpy impact value of the cylinder of 0.8 × 10 ⁴ kJ / m ² or more. When the fiber bundle is less than 0.8 × 10 ⁴ kJ / m ² , the fiber bundle is unwound from the packaged state and then vibrated when a large number of cylinders are returned in piles at a time to the yarn making process for use in making the package again. Or the cylinder itself may be deformed or damaged. Alternatively, in a yarn winding winder, when winding a fiber bundle around a cylinder, the fiber is first wound around the center of the cylinder and then traversed and wound up. Accordingly, since the fibers are concentrated in the central part at the initial stage of winding, troubles may occur in which the cylinder contracts. Therefore, the impact value is preferably 0.8 × 10 ⁴ kJ / m ² or more, more preferably 1.3 × 10 ⁴ kJ / m ² or more, and further preferably 1.8 × 10 ⁴ kJ / m ² or more. A higher impact value is preferable from the viewpoint of preventing deformation, but 2 × 10 ⁴ kJ / m ² is often sufficient for the purpose of a cylinder.

  The cylindrical body of the present invention preferably has a bending strength of 150 MPa or more. In the case of less than 150 MPa, for example, after winding a fiber of 150 kg or 250 kg or more with a yarn-winding winder, the cylinder is bent from one side by using an assisting device or the like when being transferred from the winder to the transport carriage. In some cases, the package rolled up may collapse or the cylinder may break. Therefore, the bending strength is preferably 150 MPa or more, more preferably 180 MPa, and further preferably 200 MPa. As described above, the higher the bending strength, the better. However, 220 MPa is often sufficient for the purpose of use as a cylinder.

  There are various means for transporting packages (including large packages with a large amount of winding) far away, but for airplanes, excessive gravity is applied during take-off and landing, and for ships, the impact of loading on the bottom of the ship, etc. In addition, for railroads, it is preferable that at least one of the Charpy impact value and the bending strength is within the above range since both external impacts such as impacts when the vehicle is connected are applied. preferable.

    The cylinder of the present invention preferably has an inner diameter of 100 to 160 mm. From the viewpoint of reducing the load applied to the end of the cylindrical body when being pulled out from the winder and the load applied to the winder spindle shaft, the inner diameter is preferably 100 mm or more, more preferably 110 mm or more, and still more preferably 120 mm or more. From the viewpoint of cylindrical handleability, the inner diameter is preferably 160 mm or less, more preferably 140 mm or less, and even more preferably 120 mm or less.

  Moreover, it is preferable that cylinder length is 500-1000 mm. When the winding weight on one cylinder is large, if the cylinder length is short, the winding width is narrow because the winding width is narrow, so that the thread is dropped or collapsed when the fiber is drawn out in the next process. The possibility of generating trouble increases. Therefore, it is preferably 500 mm or more, more preferably 600 mm or more, and still more preferably 700 mm or more. If the length of the cylinder is too long, the weight of the cylinder itself may increase and handling may be difficult. Therefore, the length is preferably 1000 mm or less, more preferably 900 mm or less, and still more preferably 800 mm or less.

  Although the material of the cylinder of the present invention is not particularly limited, it is preferably made of fiber reinforced plastic from the viewpoint of strength improvement and weight reduction. Although it may be paper, fiber-reinforced plastic is preferred from the standpoint of preventing deformation due to weather during transportation because the number of continuous use can be increased. Further, by using fiber reinforced plastic, the breakage rate can be lowered and the amount of deformation of the cylindrical body can be reduced even when compared with that of bakelite, and problems such as winding tightening can be prevented. Here, glass fiber or carbon fiber is preferably used as the reinforcing fiber of the fiber-reinforced plastic. Such reinforcing fibers may be in the form of bundles, and may be woven or non-woven. The form of the reinforcing fiber is preferably a woven fabric in that it is easy to repair and reuse a portion damaged by dropping during handling or vibration during long-distance transportation.

  There are a filament winding method, a sheet winding method, and the like as a method for producing a fiber reinforced plastic cylinder. The filament winding method is a method in which a mandrel is not impregnated with resin, or a reinforcing fiber bundle impregnated with resin is wound around and molded, and it has the advantage of being inexpensive and suitable for mass production. Since the fiber axis of the fiber layer cannot be arranged, it is difficult to increase the elastic modulus in the cylinder axis direction, and it is somewhat difficult in terms of improving bending strength and rigidity in the cylinder longitudinal direction. From the viewpoint of improving the strength and rigidity in the axial direction, a sheet winding method in which a reinforcing fiber sheet (prepreg) not impregnated with resin or impregnated with resin is wound around a mandrel is preferable. The prepreg used in the sheet winding method may be a so-called UD prepreg in which reinforcing fibers are aligned in one direction, or a woven prepreg using woven fabric as the reinforcing fibers. The fiber axis direction of the UD prepreg can be bonded at an appropriate angle in order to increase the strength and rigidity in the cylinder axis direction and the circumferential direction, but the fabric prepreg is superior in that the labor of lamination can be omitted. Yes. Of course, a woven prepreg and a UD prepreg may be laminated. As the reinforcing fiber, glass fiber, carbon fiber, and other fibers are used, but low-priced glass fiber is preferably used. Further, a carbon fiber that can maintain the bending strength and Charpy impact value of the cylindrical body and can be lightweight is more preferable. As the resin used for the fiber reinforced plastic, an epoxy resin, a polyester resin, an unsaturated polyester resin, or the like is preferable. The fiber content is preferably 20 to 50% by weight. From the viewpoint of weight reduction, the fiber content is preferably as high as possible, preferably 20% by weight or more, more preferably 25% by weight or more, and still more preferably 30% by weight or more. On the other hand, from the viewpoint of cost and ease of processing, the fiber content is preferably low, preferably 50% by weight or less, more preferably 45% by weight or less, and still more preferably 40% by weight or less.

Here, an example of the manufacturing method by the sheet | seat winding method of the cylinder of this invention is demonstrated.
(1) Formation of innermost peripheral fiber reinforced resin layer First, a mold release agent is applied to a mandrel that becomes an inner core during the production of a cylindrical body. At this time, when the mandrel is rotated, it can be efficiently applied. Next, a cured resin is applied to the mandrel, and the woven fabric is wound around the mandrel a predetermined number of times (for example, three times). The winding may be performed manually or by rotating the mandrel at a predetermined rotation speed (for example, 3 m / min) and winding it around. By this step, the innermost peripheral fiber reinforced resin layer is formed.
(2) Reinforced fiber-containing resin layer inside the cured resin layer Next, the reinforcing fiber sheet is wound around the innermost fiber reinforced resin layer a predetermined number of times (for example, 7 times) while applying the cured resin together with the polyester nonwoven fabric. Put on. By this step, the reinforcing fiber-containing resin layer inside the cured resin layer is formed.
(3) Cured resin layer on the outer side of the fiber-reinforced resin layer Next, the reinforcing fiber sheet is wound around the reinforced fiber-containing resin layer a predetermined number of times (for example, 10 times) while applying a polyester non-woven fabric to the resin. . By this step, the cured resin layer of the outer portion of the fiber-reinforced resin layer is formed.
(4) Surface smoothing Next, the surface is lightly pressed and smoothed with a hand roller or the like. When the operation is performed while rotating the mandrel in (1) to (3), the rotation number of the mandrel may be increased (for example, 30 m / min), and the surface smoothing step may be continuously performed. .
(5) Drying Next, it is dried at room temperature for a predetermined time.
(6) Finishing After that, the fiber reinforced cylindrical body that has been dried and hardened is pulled out from the mandrel using a drawing machine, and is ground so that the outer diameter dimension is a predetermined dimension, and the total length dimension is a predetermined dimension. Cutting process.
The cylindrical body is completed through the above steps.

  Next, the acrylic fiber package of the present invention will be described.

  The acrylic fiber package of the present invention is characterized in that an acrylic fiber is wound around the cylindrical body of the present invention.

  Here, the acrylic fiber preferably has a total fineness of 1000 to 5000 dtex.

  As the acrylic polymer constituting the acrylic fiber of the present invention, an acrylic polymer having 90% by weight or more of acrylonitrile and 10% by weight or less of a monomer copolymerizable with acrylonitrile is preferably used.

  Examples of the copolymerizable monomer include acrylic acid, methacrylic acid, itaconic acid or methyl ester, propyl ester, butyl ester, alkali metal salt, ammonium salt, allyl sulfonic acid, methallyl sulfonic acid, styrene sulfonic acid, And at least one selected from the group consisting of these alkali metal salts can be used.

  Such an acrylic polymer is obtained by a polymerization method such as emulsion polymerization, bulk polymerization, solution polymerization and the like. As a measure of the degree of polymerization at this time, the intrinsic viscosity is preferably 1 or more, more preferably 1.25 or more, particularly preferably. Is preferably 1.5 or more. If the intrinsic viscosity is less than 1, spinning may be impossible. The intrinsic viscosity is preferably 5 or less from the viewpoint of spinning stability. From the obtained polymer, dimethylacetamide, dimethylsulfoxide (hereinafter referred to as DMSO), dimethylformamide, nitric acid, rhodium soda washing solution, etc. are used as a solvent to prepare the polymer solution, which is then spun by a wet spinning method, a dry-wet spinning method, or the like. And the acrylic fiber as an acrylic fiber can be obtained by passing through another process. In such an acrylic fiber, a dry and wet spinning method is preferably used to produce a raw yarn having a smooth single fiber surface with high productivity.

  In the present invention, the dry and wet spinneret used for the acrylic fiber is preferably a perforated plate having hundreds to tens of thousands of pores of 0.5 mm or less, and the shape thereof is circular or rectangular. Further, a combination of these is preferable, and in any case, the base surface is preferably a flat surface.

  In the case of a spinning method using a solvent and a plasticizer, the spun yarn may be stretched directly in a bath, or may be stretched in a bath after removing the solvent and the plasticizer by washing with water. The stretching in the bath is preferably stretched about 2 to 6 times in a bath at 50 to 98 ° C. Further, it is preferable to apply such a silicone oil after stretching in the bath. Silicone oils are often used as emulsions, and at this time, it is preferable to use an emulsifier together.

  Such an emulsifier is a compound having a surface activity that promotes and stabilizes the formation of an emulsion. As a specific example thereof, polyethylene glycol alkyl ether is preferably used. The application method may be appropriately selected and used. Specifically, means such as an immersion method, a kiss roller method, and a guide oiling method are employed. The amount of silicone oil to be applied is preferably 0.01 to 8% by weight, more preferably 0.02 to 5% by weight, and particularly preferably 0.1 to 3% by weight. If it is less than 0.01% by weight, the quality of the carbon fibers that can be fused with each other may deteriorate. Moreover, when it exceeds 8 weight%, stability as an oil agent may worsen.

  In the present invention, the fiber bundle to which the oil agent is applied can be quickly dried with at least one hot drum or the like, thereby achieving dry densification of the fibers. A higher drying temperature is preferable because the crosslinking reaction of the silicone oil agent is promoted. Specifically, the drying temperature is preferably 150 ° C. or higher, and more preferably 180 ° C. or higher. Here, the drying temperature, the drying time, and the like can be appropriately changed. Moreover, the fiber bundle after drying densification can also be heat-treated while further stretching in a high-temperature environment such as in pressurized steam, if necessary. By such heat treatment, the oil agent spreads uniformly and the effect of preventing the occurrence of surface defects resulting from the adhesion between single fibers is increased, and a precursor having more preferable fineness and crystal orientation can be obtained. The steam pressure, temperature, and post-drawing ratio during post-drawing may be appropriately selected and used within a range that does not cause yarn breakage or fluff generation. Then, it is wound up by a cylinder and an acrylic fiber package is completed. When winding on a cylinder, a plurality of fiber bundles may be wound simultaneously.

When winding up to a cylinder, if the winding tension is less than 4 × 10 ⁻⁵ kg / dtex, a large package of 150 kg or 250 kg may be rolled up even if it is rolled up by a winder or transported even if it can be rolled up There may be a problem that the package is changed due to the vibration inside. Therefore, the winding tension is preferably 4 × 10 ⁻⁵ kg / dtex or more, more preferably 5 × 10 ⁻⁵ kg / dtex or more, and further preferably 6 × 10 ⁻⁵ kg / dtex or more. Further, if the winding tension is too high, the package shape at the time of winding is poor, and problems such as collapse during transportation may occur. Therefore, the winding tension is preferably 2 × 10 ⁻⁴ kg / dtex or less. ⁻⁴ kg / dtex or less is more preferable, and 0.8 × 10 ⁻⁴ kg / dtex or less is still more preferable.

Hereinafter, the present invention will be described more specifically with reference to examples.

  The characteristics of the cylinders and the like obtained in each example and comparative example were measured based on the following method. The results measured in Examples and Comparative Examples are shown in Table 1.

(Bending strength)
The glass fiber cylinder was measured according to JISK7017 (1999), and the carbon fiber cylinder was measured according to JISK7074 (1988). The n number was 5, and the average value was defined as the bending strength. Instron 1125 was used as a measuring device.

(Charpy impact value)
The glass fiber cylinder was measured according to JIS K7061 (1992), and the carbon fiber cylinder was measured according to JIS K 7077 (1991). The n number was 5, and the average value was the Charpy impact value. A Yonekura 300SC instrumented Charpy impact tester was used as the measuring device.

(Maximum deformation rate of inner diameter of cylinder)
The maximum deformation rate of the cylinder inner diameter is defined by the following equation.
Maximum deformation ratio of the inner diameter of the cylinder = (inner diameter of the cylinder before winding-inner diameter of the smallest part of the cylinder three days after winding) / inner diameter of the cylinder before winding × 100 (%)
Prepare an acrylic plate hollowed out in a small circle every 2 mm from the inner diameter of the cylinder. The acrylic plate is inserted into the cylinder from one side, and the maximum diameter passing from the other side is defined as the cylinder minimum diameter. For each of the examples and comparative examples, the deformation rate was measured as n number 10.

(Unsolving trouble)
After running on a general road for 10 km at a speed of 20 km / h, the yarn package was pulled out with a tension of 40 × 10 ⁻⁵ N / dtex, and the yarn pathage of a roller or the like was evaluated for 2 days, and the number of occurrences was counted.

Example 1
-Manufacture of cylindrical body (1) Formation of innermost peripheral fiber reinforced resin layer First, a mold release agent was applied to a mandrel serving as an inner core when manufacturing a cylindrical body. Next, the cured resin was applied to the mandrel, and the woven fabric was wound around the mandrel three times. For winding, the mandrel was rotated at 3 m / min and wound around it. By this step, the innermost peripheral fiber reinforced resin layer is formed.
(2) Reinforced fiber-containing resin layer inside the cured resin layer Next, the glass fiber sheet was wrapped around the innermost fiber-reinforced resin layer 7 times while applying the cured resin together with the polyester nonwoven fabric. By this step, a reinforcing fiber-containing resin layer inside the cured resin layer was formed.
(3) Cured resin layer on the outer side of the fiber reinforced resin layer Next, a glass fiber sheet was wound around the reinforced fiber resin layer 10 times while a polyester non-woven fabric was applied with a cured resin. The cured resin layer of the outer part of the fiber reinforced resin layer was formed by this process.
(4) Surface smoothing Next, the surface was lightly pressed and smoothed with a hand roller or the like. Since the operation has been carried out while rotating the mandrel in (1) to (3), the mandrel rotation speed was increased to 30 m / min, and this surface smoothing step was continuously performed.
(5) Drying Next, it was dried at room temperature for a predetermined time.
(6) Finishing After that, the fiber reinforced cylindrical body that has been dried and hardened is pulled out from the mandrel using a drawing machine, and is ground so that the outer diameter dimension is a predetermined dimension, and the total length dimension is a predetermined dimension. Cut and processed.
-Manufacture of acrylic fiber package By a solution polymerization method using dimethyl sulfoxide as a solvent, a spinning stock solution having a copolymer concentration of 99% by weight of acrylonitrile and 1% by mole of itaconic acid was obtained. After polymerization, ammonia gas was blown to pH 8.5 to neutralize itaconic acid, and ammonium groups were introduced into the polymer component to improve the hydrophilicity of the spinning dope. The obtained stock solution for spinning was set to 40 ° C., and was discharged into the air once using a spinneret having a diameter of 0.15 mm and a hole number of 4000 holes, passed through a space of about 3 mm, and then controlled to 5 ° C. 35% Coagulation was performed by dry and wet spinning introduced into a coagulation bath composed of an aqueous dimethyl sulfoxide solution. The obtained coagulated yarn was washed with water and then stretched three times in warm water at 70 ° C., and further passed through an oil agent bath to give a silicone oil. The silicone oil component is a water emulsion system containing amino-modified silicone, epoxy-modified silicone and alkylene oxide-modified silicone. The concentration in the oil bath was adjusted by diluting with water so that the pure content was 2.0%. Furthermore, the drying process for 40 second of contact time was performed using the 180 degreeC heating roller. The resulting dried yarn is stretched in pressurized steam of 0.4 MPa-G to make the total spinning ratio 14 times, and the single fiber fineness 1.1 dtex, single fiber number 4000, total fineness 4400 dtex acrylic A fiber reinforced plastic cylinder having an outer diameter of 150 mm, a thickness of 5 mm, a length of 800 mm, and an inner diameter of 140 mm measured by an acrylic plate was manufactured by the above method under a winding start tension of 500 g / st using a winder. 150 kg was wound up. In addition, the silicone oil agent adhesion amount of the obtained acrylic fiber was 1.0% in a pure part. The cylinder shrinkage after 3 days was 0.5%, and it was good without any unraveling trouble.
(Example 2)
An acrylic fiber package was produced in the same manner as in Example 1 except that the fiber winding tension was 3 × 10 ⁻⁵ kg / dtex. The results are shown in Table 1.
(Example 3)
An acrylic fiber package was produced in the same manner as in Example 1 except that a cylinder having a Charpy impact value as low as 1.0 × 10 ⁴ kJ / m ² was used. The results are shown in Table 1. In addition, the manufacturing method of the cylinder used in Example 3 is the same as the method described in Example 1 except that the number of windings in the cylinder manufacturing step (3) is set to 5.

Example 4
An acrylic fiber package was produced in the same manner as in Example 1 except that a cylinder having a low bending strength of 150 MPa was used. The results are shown in Table 1. The cylinder manufacturing method used in Example 4 is the same as the method described in Example 1 except that the number of windings in the cylinder manufacturing step (3) is three.

(Example 5)
An acrylic fiber package was produced in the same manner as in Example 1 except that the cylinder was changed. The results are shown in Table 1. The cylinder manufacturing method used in Example 5 is the same as the method described in Example 1 except that the reinforcing fiber is changed to carbon fiber.

(Comparative Example 1)
A fiber similar to that of Example 1 was wound up except that the material of the cylinder was bakelite. The results are shown in Table 1.

(Comparative Example 2)
A fiber similar to that of Example 1 was wound up except that the material of the cylinder was water-resistant base paper. The results are shown in Table 1.

  The cylindrical body of the present invention can be suitably used as a winding core for winding various fiber packages, and is particularly suitable for winding and storing a large amount of fibers. Moreover, since the acrylic fiber package of the present invention is excellent in winding amount and storage stability, it is effective as a means for supplying raw material fibers.

Claims (6)

A cylindrical body for winding a fiber, and when the acrylic fiber is wound in a package shape at 4 × 10 ⁻⁵ kg / dtex or more and left in that state for 3 days, the maximum deformation rate of the minimum inner diameter of the cylindrical body Is a cylinder having a content of 0.1 to 1%. The cylindrical body according to claim 1, wherein the Charpy impact value is 0.8 × 10 ⁴ kJ / m ² or more. The cylinder according to claim 1 or 2, wherein the bending strength is 150 MPa or more. The cylinder according to any one of claims 1 to 3, wherein the cylinder has an inner diameter of 100 mm or more and a cylinder length of 500 mm or more. The cylindrical body according to any one of claims 1 to 4, which is made of fiber reinforced plastic. An acrylic fiber package obtained by winding an acrylic fiber having a total fineness of 5000 dtex or less and a total winding weight of 50 to 150 kg on a cylindrical body according to any one of claims 1 to 5.