JP2007069985A - Glass roving package, glass roving packing element, and its packing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To avoid constraint such as an increase in processes, application of an additive and an increase in control points, and prevent a collapse in unpacking glass roving. <P>SOLUTION: A region of 10 to 90% of an area of at least one of a bottom 14 and an upper surface 13 of the approximately cylindrical glass roving 11 is covered with a shrink-wrap film 20 with a thickness of 20-40 μm, thereby forming an uncovered part 13b. In addition, two or more glass roving packages 10 are packed in an array on a base. Further, a method includes a covering step of covering a region of 10 to 90% of the area of at least one of the upper surface 13 and the bottom 14 of the glass roving 11 with the film 20 for providing the uncovered part 13b, and a placing step for putting two or more obtained packages 10 on the base. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention applies fiber reinforced resin (FRP) by various molding methods such as SMC (Sheet Molding Compound) method, spray up method, filament winding (FW) method, matched die method, and drawing method. The present invention relates to a glass roving package used for manufacturing, a package in which a plurality of the glass roving packages are packaged, and a packaging method thereof.

  Generally, a glass roving package and a package are produced as follows. First, the homogenized molten glass is called a platinum bushing, and a glass monofilament is continuously formed by being drawn out from a heat-resistant container having a plurality of nozzles provided on the bottom surface thereof. The glass monofilament formed from the bushing nozzle has a diameter of several μm to several tens of μm, and the surface of each glass monofilament is coated with a sizing agent. One or several glass monofilaments of tens to thousands It is bundled into glass strands and rolled up as a cake. The glass strand is then dried in the form of a cake. Next, a plurality of glass strands are unwound from the cake after drying, and are wound by a winding device (winder) while being twilled to produce a glass roving. After that, the glass roving is wrapped with a shrink film (or heat shrink film) to form a package, which is stacked in multiple rows, multiple rows and multiple stages on a base (pallet), and each roll is used continuously as a loading roll. As possible, it is called krill, and after the strand ends are connected by a knot that disperses and dissociates the strands after cutting, they are integrated into a base unit to form a package.

  In recent years, the glass roving package has been used in a large size as disclosed in Patent Document 1 as an easy-to-use form. A large glass roving package has a mass of 25 kg or more. Since such a large glass roving package is heavier than a normal size glass roving package, when the unpacking operation is performed with a plurality of glass roving packages stacked, The film after the use of the side roll ends, or the packaging or film that has become only the outer layer roll near the end collapses and falls to the lower stage roll while unrolling the lower stage roll, and falls from the lower stage roll. The running operation of the strands will be hindered. Also, depending on the situation, problems may occur due to the collapse phenomenon of glass roving, which is called a catch leading to the stoppage of travel, or the fallen and collapsed package is entangled with the running strand, and part of it is resolved It may cause problems that are mixed in during the process.

In order to solve such a problem, as described in Patent Document 2, the operation of adhering the strands to each other by heating the glass roving in advance at a temperature of 50 to 100 ° C. for about 1 to 8 hours, so-called rebonization It is disclosed to perform an operation for effecting. Patent Document 2 also discloses that the winding density of roving is 1.45 to 1.75 g / cm ³ . Further, as described in Patent Document 3, there are (a) a method of using an adhesive film, (b) a method of imparting adhesiveness to the shrink film itself, and (c) the use of an adhesive. A method of employing a shrink film having a range of chargeability is also disclosed.
JP 2005-145715 A Japanese Patent Laid-Open No. 07-315689 JP 2002-104497 A

  However, the technology or method disclosed so far is not sufficient as a countermeasure for dealing with the collapse phenomenon of the package that occurs when the glass roving package is unwound. For example, in the method of effecting rebonation in Patent Document 2, one heating step must be added, which leads to an increase in manufacturing cost. Although adjusting the winding density within a predetermined range is excellent, it is necessary to manage the winding density. Moreover, in the various methods described in Patent Document 3, it is necessary to prepare a material other than glass roving and shrink film, so that there is a problem that the material cost increases. Furthermore, in order to charge the shrink film within a predetermined range, it is necessary to add a specific antistatic agent and to perform measurement management with an electrostatic potential measuring device.

  Therefore, the present inventor repeated research, and there was no restriction such as the increase in the process, the addition of additives, the increase in the management items as described above, and the collapse of the glass roving work of the package could occur. It is an object of the present invention to provide a glass roving package body that has been subjected to predetermined packaging with a packaging film having an appropriate rigidity, a package body in which the package body is integrated, and a packaging method therefor.

  The glass roving package of the present invention is a package obtained by applying shrink wrapping to a glass roving having a substantially cylindrical shape by a shrink wrapping film, and the film has a thickness of 20 μm to 40 μm, and the bottom surface of the glass roving or It is characterized in that at least one area of the upper surface is covered with the film from the 10% to 90% range to form an uncoated part.

  Here, it is a package body in which a shrink wrap is applied to a glass roving having a substantially cylindrical shape by a shrink wrap film, and the film has a thickness of 20 μm to 40 μm, on at least one of a bottom surface or an upper surface of the glass roving, That the uncoated portion is formed by being covered with the film from 10 to 90% of the area is as follows. That is, the glass roving side collection of a substantially cylindrical glass roving package obtained by coating the outer surface of a glass roving having a substantially cylindrical shape with a heat-shrinkable film, that is, a shrink wrapping film. The entire surface is covered with a heat-shrinkable film, and the heat-shrinkable film is covered to 10% to 90% of the total area of any one of the bottom surfaces or top surfaces of the substantially cylinder. This means that the heat-shrinkable film has an uncoated portion at the center of the surface portion.

  When the thickness of the shrink wrapping film is thinner than 20 μm, the rigidity of the wrapping body itself may be insufficient, and the wrapping film may collapse into the lower glass roving wrapping body together with the bundle of strands, and during the unwinding operation. It is entangled with a bundle of strands and becomes in a hooked state, and so-called lifting, which causes a malfunction phenomenon that hinders unraveling. For this reason, the thickness dimension of a film needs to be 20 micrometers or more. In addition, if the thickness of the shrink wrapping film exceeds 40 μm, the wrapping film with no bundle of strands will remain in the upper part of the glass roving unwinding operation for a long time. It will be in the state which produces the supply failure | defective of a glass thread | yarn etc., for example, preventing the driving | running | working operation | movement. For this reason, the thickness dimension of the shrink wrapping film is preferably in the range of 20 μm to 40 μm, and more preferably in the range of 25 μm to 35 μm.

  When the bottom or top surface of the glass roving is covered to a range of 10 to 90% of the area of at least one of them, an uncoated portion is formed. A shrink film covers either the bottom or top surface of the glass roving. In a state where the shrink film is coated so that the area of the uncovered part is not less than 10% with respect to the area of the bottom or top surface of the glass roving and not more than 90%. is there. If the portion that is not covered with the shrink film is less than 10%, a problem may occur due to insufficient rigidity of the package itself as described above. On the other hand, if it exceeds 90%, the packaging film may interfere with the running operation of the strands during unwinding, which is not preferable. In view of the above, it is more preferable that the packaging body in which the glass roving having a substantially cylindrical shape subjected to the shrink wrapping is packaged has a heat shrinkable film of 15% to 85% of the area of at least one of the bottom surface or the top surface of the substantially cylindrical shape. More preferably, 20% to 80% of the total area is covered with a heat-shrinkable film, more preferably 30% to 70% of the total area. It is to be covered.

  The shape of the uncovered portion on either the bottom surface or the top surface of the substantially cylindrical shape may be any shape, but is a shape having an outline without an acute angle portion such as a substantially elliptical shape, for example. This is preferable because the shape is less likely to cause a problem of running operation in unraveling such as being caught on the shrink wrapping film during running of the strand. Further, the number of uncovered portions on either the bottom surface or the top surface of the substantially cylindrical shape of the package may be one or plural.

  As for the material of the shrink wrapping film, any material can be used as long as it has a predetermined heat shrinkage performance. For example, a polyolefin film, a vinyl chloride film, or the like can be used.

  In addition to the above, the uncoated portion of the shrink wrapping film has a substantially elliptical shape and the maximum opening diameter is 100 mm or more in the glass roving package of the present invention.

  The uncovered portion of the shrink wrap film on the bottom surface or top surface of the glass roving package body has a substantially elliptical shape and the maximum opening diameter is 100 mm or more. The shape of the part of the open state of a certain shrink wrapping film is an ellipse or a shape similar to an ellipse, and the size of the maximum diameter of the substantially elliptical opening is 100 mm or more. Represents.

  If the glass roving package of the present invention satisfies the relationship of 1.1 ≦ (2r / h) ≦ 4 between the winding height (h) and the outer diameter (2r) of the cylinder in addition to the above, However, it is not limited to the form. Furthermore, about the strand which comprises glass roving, the cross-sectional shape can employ | adopt various shapes, such as a perfect circle, a flat circle, a hollow circle, a rectangle.

  In addition to the above, the glass roving package of the present invention is preferably 25 kg or more, because the number of strand ends connected between the glass rovings can be reduced.

  Here, the mass being 25 kg or more means that the mass of the packaging body obtained by combining the mass of the packaging film with the glass roving is not less than 25 kg. If the mass is less than 25 kg, the above-described problems are unlikely to occur even when stacked. For this reason, it is a requirement that it is 25 kg or more. And from such a viewpoint, it is more preferably 30 kg or more, and further preferably 35 kg or more.

  In addition to the above, the glass roving package of the present invention can be selected as a larger packaging film as compared with the size of the glass roving as long as it is covered with a shrink wrap film having a shrinkage ratio exceeding 50%. Therefore, it is easy to perform the operation of putting the roving into the packaging film before shrinking.

  Covering with a shrink wrapping film with a shrinkage rate exceeding 50% represents a shrink performance that indicates how much the size of the wrapping film after heat shrinkage shrinks with respect to the packaging film before heat shrinkage, In the glass roving package of the present invention, it is preferable to employ a shrink wrap film having a large shrinkage rate in consideration of the above-described workability, and an operator unfamiliar with the wrapping work is responsible for this process. In order to facilitate the work, it is preferable to use a shrink wrap film having a shrinkage ratio of 50% or more. Incidentally, the shrinkage rate of the present invention represents the lateral shrinkage rate.

  And as shrink wrapping film to be used, markings, marks, cuts can be provided on the opening side of the bag so as to improve other workability, or a characteristic such that a predetermined crease is generated in advance can be given. It is also possible to devise such as applying a predetermined coloring. For the shrink wrapping film according to the present invention, a surface treatment agent such as an antistatic agent, an antioxidant, a lubricant, an adhesive or a film reinforcing agent is applied to a predetermined portion or the entire surface of the film by a known method, It is possible to further improve the performance of the packaging film by coating.

  The glass roving package of the present invention is characterized in that two or more of the glass roving packages described above are aligned and packaged on a base.

  Here, two or more of the glass roving packages described above are aligned and packaged on a base, which is a package packaged with a glass roving having a substantially cylindrical shape subjected to shrink wrapping with a film, The shrink wrapping film has a thickness of 20 μm to 40 μm, and the film covers at least one of the bottom surface or the top surface of the glass roving up to a range of 10 to 90% of the area, and an uncoated portion at the center portion. This means that at least two or more glass roving packaging bodies formed with the above are integrated and packed on a base.

  As for the base, it is possible to arrange and arrange a plurality of glass roving packages in any form and material, and have sufficient mechanical strength to withstand transportation. Can be used if present. As the base, for example, a material made of wood, metal, synthetic resin, FRP or the like is used alone or in combination, and even if a plurality of glass roving packages are loaded, there is no significant deformation over time. The roving package itself can be used as long as it has rigidity that does not cause breakage that causes damage. In addition, this base has a structure that can be inserted with a claw such as a forklift when being mounted or transported, and the base can also be fixed with a rope or the like when transported while being mounted on a vehicle. Therefore, it is preferable to have a shape having protrusions, openings, etc. that are easy to fix, for example, a pallet shape.

  Also, regarding the shape and method of accumulation on the base, the number of glass roving packages to be loaded on the base, the size of the glass roving package, and how many clues are provided in one glass roving package Can be selected as appropriate. If the most typical example of the preferred integrated alignment shape is illustrated, it can be laminated by adopting a 3 to 5 column structure with an arrangement of two columns in a row and one column. As for the method of aligning and accumulating, it may be stacked from the lowest level to the upper level, or may be arranged and arranged in advance at other locations, and transferred and stacked on the substrate while maintaining its shape.

  In addition, in order to prevent misalignment during the conveyance of the glass roving, the glass roving package can be fixed to each other at a predetermined position of the glass roving package accumulated on the base using a binding band. As the binding band, polypropylene, polyethylene, PET (polyethylene terephthalate), and the like are suitable, but other bands may be adopted as long as the predetermined performance is satisfied.

  In addition, as a film that covers the entire accumulation from above the accumulated glass roving package, various materials can be used as long as they have a desired function such as dust prevention. Depending on the case, shrink wrapping may be used. Specifically, it is possible to employ a stretch sheet, a shrink film, etc. made of synthetic resin such as polyethylene, polypropylene, and vinyl chloride. However, other materials may be employed as long as they have a desired function. Is possible.

  In addition to the above-mentioned base, bundling band, and covering film for the entire stack of glass roving packages, the glass roving package of the present invention can be used for the glass roving package of the present invention as necessary, such as protecting the side and bottom. There is a protective plate adopted as a purpose. The protective plate efficiently protects the glass roving or the package from mechanical damage due to dirt, impact, friction or the like when the glass roving package is loaded on the base. As such a material, for example, a lightweight corrugated board, a lightweight rubber sheet, a urethane sheet, or the like can be used to achieve the object. It is also possible to adopt a structure in which slits, concave / convex depressions and protrusions are provided at predetermined locations on the protective plate, and are arranged at predetermined locations on the substrate by matching with the same shape portions previously provided on the substrate. is there. In addition, by using a plate-like body having a desired shape and material as a plurality of protective plates, it is possible to achieve performance tailored to each arrangement position, or to compensate for the mechanical strength of the glass roving package. It is also possible to do this.

  And, regarding the arrangement of the protective plate of the glass roving package as described above, the protective plate is arranged at a predetermined position before or after coating the glass roving in an accumulated state with a coating film as necessary. By doing so, the final glass roving package may be configured.

  In addition, if necessary, the insertion holes provided at the four corners of the base have sufficient strength and can be made upright by inserting a columnar material made of the same material as the base or a different material. A plurality of glass rovings by fixing the protrusions by other appropriate methods and disposing them on a predetermined base of the base after further forming another base or another glass roving package on the columnar object It is also possible to have an integrated state in which the packing body is arranged in a plurality of stages.

  The method for packing a glass roving package according to the present invention includes a coating step of covering an area of 10% to 90% of the area of at least one of the upper surface and the bottom surface of a glass roving with a shrink wrapping film and providing an uncoated portion. And a disposing step of disposing two or more glass roving packages on the base.

  Here, a coating step of covering the range of 10% to 90% of the area of at least one of the upper surface or the bottom surface of the glass roving with a shrink wrapping film to provide an uncoated portion, and two or more obtained glass roving packages Having the disposing step to be arranged on the base is as follows. That is, after covering the shrink wrapping film so that it has at least one opening, that is, an uncoated portion, at the center of either the top surface or the bottom surface of the substantially cylindrical shape, it is heated by appropriate heating means in that state. The shrink wrapping film is heat-shrinked so as to be in close contact with the substantially cylindrical glass roving outer shape to form a glass roving wrapping body, and at least two glass roving wrapping bodies thus obtained are placed on the base. It shows that it is set as a glass roving packing body by installing.

  The shape of the shrink wrapping film to be used is not particularly limited with respect to the covering step in which the top surface or the bottom surface of the glass roving is covered with the shrink wrapping film. That is, a belt-shaped shrink wrapping film can be wound around the roving, and the shape can be adjusted by heat fusion or the like to provide an uncoated surface on the top or bottom of the glass roving. It is also possible to prepare a bag-shaped shrink wrapping film in advance and store the glass roving in the bag-shaped shrink wrapping film. When using a bag-like shrink wrap film, align the opening of the bag with a predetermined position on the top or bottom surface of the substantially cylindrical shape, or place it in a predetermined position on the top or bottom surface of the substantially cylindrical shape after completely sealing one end. Processing that provides an opening of a predetermined shape may be performed.

  Any heating means may be taken when the glass roving covered with the shrink wrapping film is heated to shrink. For example, a continuous heating furnace such as a tunnel furnace can be used for heating according to a predetermined schedule, or a batch-type heating furnace can be adopted. Furthermore, it is also possible to heat one by one using a hot air heater or a handy type industrial dryer as required.

  In the step of disposing the obtained two or more glass roving packages on the base, the glass roving package may be disposed on the base by any method. For example, it may depend on human power, or may use a transfer robot or the like.

  (1) As described above, the glass roving package of the present invention is a package in which shrink wrap is applied to a glass roving having a substantially cylindrical shape by a shrink wrap film, and the film has a thickness of 20 μm to 40 μm. Yes, at least one area of the bottom or top surface of the glass roving is covered with the film from 10% to 90% to form an uncoated portion. Even when being crushed, it is difficult for the package in the upper stage to interfere with the running operation of the glass strand during unwinding, and it is possible to suppress the occurrence of problems that temporarily stop the unwinding operation. The efficiency of the unwinding process can be improved.

  (2) Further, in the glass roving package of the present invention, if the uncovered portion of the shrink wrapping film is substantially elliptical and the maximum opening diameter is 100 mm or more, there is a probability that the running operation of the strand will be hindered. Therefore, the process management related to the unzipping operation can be saved.

  (3) If the mass of the glass roving package of the present invention is 25 kg or more, it is possible to reduce the labor of connecting the ends of the strands, and even when they are used by being laminated, Therefore, it is possible to improve the efficiency of a series of operations related to the glass roving package.

  (4) If the glass roving package of the present invention is coated with a shrink wrap film having a shrinkage rate exceeding 50%, the operation of packaging the glass roving can be easily performed, and the working efficiency is increased. It is possible to shorten the work time required for shrink roving the roving.

  (5) Further, the glass roving package of the present invention is not only convenient for conveyance, but also two or more of the glass roving packages described above are arranged and packaged on a base. The unzipping work is easy and can be easily used for various purposes.

  (6) Moreover, the glass roving packing body packing method of the present invention is a coating step in which an uncovered portion is provided by covering a range of 10% to 90% of the area of at least one of the top and bottom surfaces of the glass roving with a shrink wrapping film. And a disposing step of disposing the obtained two or more glass roving packages on the base, so that there is no need for high costs due to excessive packaging, and in the customer's process It is possible to construct a manufacturing process without any stagnation due to travel stop and the like, and it becomes easy to provide a glass fiber product with a stable quality.

  The glass roving packaging body and the glass roving packaging body in which the glass roving packaging body of the present invention is integrated and the packaging method thereof will be specifically described below based on examples.

  FIG. 1 shows a photograph of the glass roving package of the present invention, and FIG. 2 shows a perspective view for explanation.

  The glass roving package 10 is one in which 200 monofilaments of E glass are used as one, and a plurality of glass strands 30 wound together to form 4800 tex are wrapped, and the mass thereof is 54 kg. The outer shape of the glass roving packaging body 10 is a winding body having a substantially cylindrical shape, and the side peripheral surface 12 and the upper surface 13 thereof are covered with an olefin-based shrink packaging film 20 having a thickness of 25 μm. 13 includes a covering portion 13a and an uncovered portion 13b. The uncoated portion 13b has a substantially elliptical shape with a maximum diameter of 300 mm, and 40% of the area of the substantially cylindrical upper surface 13 is covered with the olefin-based shrink wrapping film 20. It is in a state. The olefin-based shrink wrapping film 20 has an appropriate rigidity, and the covering portion is in the range of 10% to 90% of the area of at least one of the upper surface 13 or the bottom surface 14 of the glass roving 11. Can be self-supported even when only the outermost layer remains by unwinding from the inner layer of the glass roving 11, and the covering portion having an appropriate area is removed from the upper shrink bag. By suppressing the above, even if the glass strand 30 is unwound in a state where a plurality of glass roving packaging bodies 10 are laminated, the packaging body 10 can easily collapse into the lower glass roving packaging body 10. Absent.

  This glass roving package 10 is produced by the following procedure. First, the raw material adjusted to become E glass is uniformly melted in a glass melting furnace to become molten glass, and then the molten glass is drawn out as a monofilament from a bushing nozzle and coated with a sizing agent and wound around a cake. Taken and dried. Further, a plurality of glass strands 30 are drawn from a plurality of cakes while being unwound and wound by a winding device (winder) while being twilled to have a roll outer diameter of 420 mm, an inner diameter of 90 mm, and a roll height. A glass roving 11 having a length of 270 mm is produced. Next, the glass roving packaging body 10 is packaged by storing the glass roving 11 in a bag made of the olefin-based shrink packaging film 20 in accordance with the size of the glass roving 11. And the glass roving 11 accommodated in the bag body of the shrink wrapping film 20 is heat-treated in a continuous heating furnace set at a maximum temperature of 170 ° C. and contracted at a shrinkage rate exceeding 50% to obtain the glass roving package 10. It will be.

  Next, the glass roving package in which the glass roving package is integrated will be described. FIG. 3 shows a glass roving package 50 in which the glass roving package 10 of FIG. 2 is stacked in four stages on a pallet-shaped wooden base 60 and a total of 16 glass roving packages 10 are integrated. The glass roving packing body 50 is packed as follows.

  First, the four glass roving packages 10 obtained by the above-described packaging procedure are arranged one by one on a wooden base 60 having an area capable of arranging and arranging the four glass roving packages 10 by using a conveyor. The glass roving packaging body 10 produced in the same manner in the upper stage with the packaging body 10 as the lowermost stage is stacked and laminated to form a laminated state of four layers. Then, the ends of the strands 30 are connected to each other with a krill, and each step is fixed with a binding band 80. After that, a polyethylene shrink bag is covered as a packing bag (pallet shrink bag) 70, and the glass roving package is heated and shrunk. You will get 50.

  The test for comparing the unwinding performance from the state which laminated | stacked the glass roving packaging body 10 of this invention was done in the following procedures.

  First, the glass roving package 10 of the test body to be packed was prepared by the following procedure. Table 1 summarizes the properties of the test specimens used in the test and the test results.

  Each test specimen was prepared in the same procedure as in Example 1 so that a 4800 tex glass roving 11 made of E glass had the same dimensions and mass as in Example 1. Sample No. 1 and Sample No. No. 2 is such that the shrink wrap film 20 is shrunk to about 62% to 66% by heating the shrink wrapping film 20 so that the film thickness and material, and the covering area ratio of the upper surface of the substantially columnar shape satisfy the conditions in Table 1, respectively. Then, a coating treatment was performed to obtain a test body of the glass roving package 10.

  The test specimens of the obtained glass roving packaging 10 are arranged and laminated in two stages on a wooden base, respectively, and the glass strands are unwound, and at that time, the outermost strands are broken due to collapse. The presence / absence of the glass roving package 10 remaining in the upper stage was checked for the occurrence of a catch due to the collapse of the shrink wrap film, and the occurrence of a catch that hinders the strand travel during unwinding due to the shrink film. Table 1 shows the properties and evaluation results of the test specimens of the produced glass roving package 10.

  As a result of the evaluation, the specimen No. Reference numeral 1 denotes an olefin-based shrink wrapping film material, which is a glass roving wrapping body 10 having the characteristics that the thickness of the film 20 is 25 μm, the area ratio of the covering portion is 40%, and the maximum dimension of the uncovered portion is 300 mm. No catching occurred in the dredging operation, the glass strand 30 could be smoothly unwound, and no collapse phenomenon occurred.

  In addition, the specimen No. No. 2 is a specimen No. 1, the film thickness is 30 μm, the area ratio of the covering portion is 50%, the maximum dimension of the substantially oval-shaped uncovered portion is 300 mm, and the shrink wrap film 20 after heat shrinkage is appropriate. The problem with the unraveling operation is that the specimen No. It did not occur as in 1.

  [Comparative Example] Next, as a comparative example of Example 2, the specimen No. 3 and specimen No. 4. Specimen No. 5 was produced and evaluated in the same manner as in the example. However, specimen No. For No. 3, the shrink wrapping film is an olefin-based material, but the thickness of the film is 15 μm, a small sized bag is prepared in advance, the area ratio of the covering portion is 40%, and the maximum diameter size of the uncovered portion is When the unwinding operation is 300mm, the outermost strands may be caught due to the collapse, and the unrolling to the end of the roll unit was not completed. It was not possible to confirm the catch of the strand.

  Specimen No. For No. 4, since the film thickness is 50 μm, the area ratio of the coated part is 9.2%, the maximum diameter of the uncoated part is 90 mm, and it is a very rigid shrink wrapping film. Although not generated, the strand caught on the shrink wrapping film during unwinding, and the efficiency of the unwinding operation was poor.

  Specimen No. For No. 5, the film thickness is 30 μm, the area ratio of the coated part is 0.9% and less than 10%, the maximum diameter of the uncoated part is 360 mm, and the catch due to the collapse of the outermost layer strand is Although it did not occur, the shrinkage of the shrink packaging film that was empty in the glass roving package remaining in the upper stage occurred, and a catch was observed. However, it was not caught by the film in which the strand remained.

  From a series of evaluation results for the above examples and comparative examples, the glass roving package of the present invention does not cause the strand catching phenomenon that occurs during the unwinding operation of the strand, the SMC method, the spray-up method, It became clear that it is preferable as a glass roving package used for forming a fiber reinforced composite material (FRP) by a forming method such as a filament winding method or a drawing method. In addition, such a glass roving package in which a plurality of the glass roving packages of the present invention are laminated is one that can be unwound easily and efficiently. Furthermore, the glass roving package of the present invention could be produced quickly and accurately by the method of packaging the glass roving package of the present invention.

  The invention relating to the glass roving package of the present invention can also be applied to other fibers such as aramid fibers, carbon fibers, polyester fibers, polyamide fibers other than glass fibers.

The photograph of the glass roving packaging body of this invention. The perspective view of the glass roving packaging body of this invention. The perspective view of the glass roving packing body of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Glass roving package 11 Glass roving 12 Side peripheral surface 13 Upper surface 13a Covering part 13b Uncovered part 14 Bottom surface 20 Shrink packaging film 30 Strand 50 Glass roving packing body 60 Base 70 Packing bag 80 Binding band

Claims (6)

A package in which shrink wrap is applied to a glass roving having a substantially cylindrical shape by a shrink wrap film,
The film has a thickness of 20 μm to 40 μm, and at least one area of the bottom or top surface of the glass roving is covered with the film from 10% to 90% to form an uncoated portion. A glass roving package characterized by.   The glass roving package according to claim 1, wherein the uncovered portion of the shrink wrapping film has a substantially oval shape, and the maximum opening diameter is 100 mm or more.   The glass roving package according to claim 1 or 2, wherein the mass is 25 kg or more.   The glass roving package according to any one of claims 1 to 3, wherein the glass roving package is coated with a shrink wrap film having a shrinkage rate exceeding 50%.   A glass roving package comprising two or more of the glass roving packages according to any one of claims 1 to 4 arranged and packed on a base.   A covering process in which at least one of the area of at least one of the top and bottom surfaces of the glass roving is covered with a shrink wrapping film to provide an uncoated portion, and the obtained two or more glass roving wrapping bodies on the base A glass roving packaging body packing method, comprising: an arrangement step of arranging the glass roving packaging body.