Glass-fiber-yarn connected body

Abstract

The glass-fiber-yarn joined body 1 is provided with glass fiber yarns 2, 3, and a connection 5 in which a resin yarn 4 is wound around ends of both of the glass fiber yarns 2, 3, the ends being superimposed with each other. The connection 5 has a width W.sub.1 of 20 to 40 mm. When a connection diameter R as a total of diameters of the respective glass fiber yarns 2, 3 and the thickness of the resin yarn 4 wound around the connection 5 is 500 to 5000 m and a mass of each of the glass fiber yarns 2, 3 is 200 to 6000 tex, a value of a ratio of mass of each of the glass fiber yarns 2, 3 relative to the connection diameter R is in the range of 0.32 to 2.00.

Claims

1. A glass-fiber-yarn joined body, comprising: a first glass fiber yarn; a second glass fiber yarn; and a connection in which a resin yarn is wound around ends of both of the glass fiber yarns, the ends being superimposed with each other, wherein the connection has a width in a range from 20 to 40 mm, and a connection diameter as a total of diameters of the respective glass fiber yarns and a thickness of the resin yarn wound around the connection is in a range of 500 to 5000 m and a mass of each of the glass fiber yarns is in a range of 200 to 6000 tex, and a value of a ratio of mass of the glass fiber yarn relative to the connection diameter (mass of glass fiber yarn/connection diameter) is in a range of 0.32 to 2.00.

2. The glass-fiber-yarn joined body according to claim 1, wherein a width of a wound part where the resin yarn is wound is in a range of 60 to 110% of a width of the connection.

3. The glass-fiber-yarn joined body according to claim 1, wherein the value of the ratio of mass of the glass fiber yarn relative to the connection diameter in the glass-fiber-yarn joined body of claim 1 is in a range of 0.64 to 1.55.

4. A glass-fiber-reinforced resin molded product, comprising: a glass-fiber-yarn joined body that includes a first glass fiber yarn, a second glass fiber yarn, and a connection in which a resin yarn is wound around ends of both of the glass fiber yarns, the ends being superimposed with each other, and in which the connection has a width in a range from 20 to 40 mm, and a connection diameter as a total of diameters of the respective glass fiber yarns and a thickness of the resin yarn wound around the connection is in a range of 500 to 5000 m and a mass of each of the glass fiber yarns is in a range of 200 to 6000 tex, and a value of a ratio of mass of the glass fiber yarn relative to the connection diameter (mass of glass fiber yarn/connection diameter) is in a range of 0.32 to 2.00.

5. The glass-fiber-reinforced resin molded product according to claim 4, wherein a width of a wound part where the resin yarn is wound is in a range of 60 to 110% of a width of the connection.

6. The glass-fiber-reinforced resin molded product according to claim 4, wherein the value of the ratio of mass of the glass fiber yarn relative to the connection diameter is in a range of 0.64 to 1.55.

Description

BRIEF DESCRIPTION OF DRAWINGS

(1) FIG. 1 is a perspective view schematically illustrating a configuration of a glass-fiber-yarn joined body of the present invention.

(2) FIG. 2 is a sectional view along a line 11-11 of FIG. 1.

DESCRIPTION OF EMBODIMENTS

(3) Next, an embodiment of the present invention will be described in more detail with reference to the attached drawings.

(4) A glass fiber joined body 1 of the present embodiment illustrated in FIG. 1 is used for the manufacturing of long-fiber-reinforced plastic (glass-fiber-reinforced resin molded product) such as long fiber reinforced thermoplastics (LFT) or a filament winding molded product. The glass fiber joined body 1 includes a first glass fiber yarn 2, a second glass fiber yarn 3, and a connection 5 formed by winding a resin yarn 4 around a portion where the terminal end of the first glass fiber yarn 2 and the starting end of the second glass fiber yarn 3 are superimposed, and the glass fiber yarns 2, 3 are joined by the connection 5.

(5) The glass fiber yarns 2, 3 are obtained by applying a binder onto a glass filament and then bundling a plurality of glass filaments, the glass filaments having been formed by melting a glass batch prepared so as to have a predetermined glass composition when melted (a raw material of glass) and drawing the glass melt from a bushing having a large number of nozzles. The predetermined glass composition includes 50 to 70% by mass of SiO.sub.2, 5 to 30% by mass of Al.sub.2O.sub.3, 0 to 30% by mass of B.sub.2O.sub.3, 0 to 15% by mass of MgO, 0 to 30% by mass of CaO, and 0 to 5% by mass of the other components (e.g., Li.sub.2O, Na.sub.2O, K.sub.2O, Fe.sub.2O.sub.3, TiO.sub.2, F.sub.2) with respect to a total amount of glass fibers.

(6) Here, a glass composition of each of the glass fiber yarns 2, 3 is preferably a composition of E-glass (a glass composition which includes 52 to 56% by mass of SiO.sub.2, 12 to 16% by mass of Al.sub.2O.sub.3, 20 to 25% by mass of CaO and MgO in total, 5 to 10% by mass of B.sub.2O.sub.3, and 0 to 1% by mass of Li.sub.2O, Na.sub.2O, and K.sub.2O in total with respect to a total amount of the glass fibers), because the glass with this composition is easy to manufacture and excellent in versatility.

(7) The glass filament has a diameter in the range of 5.0 to 25.0 m, and each of the glass fiber yarns 2, 3 is formed by bundling the glass filaments in the number in the range of 400 to 6000 and has a mass in the range of 200 to 6000 tex (200 to 6000 g per 1000 m). Note that each of the glass fiber yarns 2, 3 is wound around a roll to form a roving, not illustrated.

(8) Here, in view of the magnitude of contribution to the strength of the long-fiber-reinforced plastic and the height of efficiency in the manufacturing of the glass fiber yarn, the diameter of the glass filament is preferably 10.0 to 25.0 m, more preferably 15.0 to 25.0 m, still more preferably 16.5 to 24.5 m, particularly preferably 16.5 to 24.0 m, and most preferably 16.6 to 23.5 m.

(9) Further, in the glass fiber yarns 2, 3, in view of the magnitude of contribution to the strength of the long-fiber-reinforced plastic and the height of efficiency in the manufacturing of the glass fiber yarn, 1000 to 5000 glass filaments are preferably bundled, and 1500 to 4500 glass filaments are preferably bundled.

(10) Moreover, in view of the magnitude of contribution to the strength of the long-fiber-reinforced plastic and the height of efficiency in the manufacturing of the glass fiber yarn, the mass of each of glass fiber yarns 2, 3 is preferably 1000 to 5000 tex, and more preferably 1100 to 4500 tex.

(11) For the resin yarn 4, it is preferable to use a yarn made of a thermoplastic resin or a thermosetting resin, such as polyamide, polypropylene, polyethylene, or polyester, is preferably used and when the matrix resin of the long-fiber-reinforced plastic is the thermoplastic resin, a yarn made of polyamide is preferably used.

(12) The connection 5 is a portion where the terminal end of the first glass fiber yarn 2 and the starting end of the second glass fiber yarn 3 are superimposed, and in more detail, the connection 5 is a portion from the terminal edge of the first glass fiber yarn 2 to the starting edge of the second glass fiber yarn 3. The connection 5 has a width W.sub.1 which is 20 to 40 mm, preferably 23 to 37 mm, more preferably 25 to 35 mm, and further preferably 27 to 33 mm.

(13) The resin yarn 4 is wound around the connection 5 by using, for example, a splicer (manufactured by Mesdan S.p.A) or the like, and a portion where the resin yarn 4 is wound has a width W.sub.2 being 60 to 110% of the width W.sub.1 of the connection 5. Here, from the viewpoint of using a smaller amount of resin yarns while more reliably preventing the resin yarns from being disjoined upon application of tension, the portion where the resin yarn 4 is wound has a width W.sub.2 preferably in the range of 65 to 100%, more preferably has a width W.sub.2 in the range of 70 to 90%, and further preferably has a width W.sub.2 in the range of 70 to 80%, with respect to the width W.sub.1 of the connection.

(14) The glass fiber joined body 1 has a connection diameter R in the range of 500 to 5000 m. The connection diameter R is the total of the diameters of the glass fiber yarns 2, 3 and the thickness of the resin yarn 4 in the laminating direction of the glass fiber yarns 2, 3 when the resin yarn 4 is wound around the connection 5. Note that FIG. 2 schematically illustrates the connection diameter R as the total of the diameters of the glass fiber yarns 2, 3 and the thickness of the resin yarn 4 wound around the connection 5.

(15) Here, the connection diameter R is preferably in the range of 1000 to 3700 m, more preferably in the range of 1200 to 3500 m, and further preferably in the range of 1300 to 3200 m.

(16) The glass fiber joined body 1 has a mass in the range of 200 to 6000 tex and the connection diameter R in the range of 500 to 5000 m, and as a result, the value of the ratio of mass of the glass fiber yarn 2 or the glass fiber yarn 3 relative to the connection diameter R (mass of glass fiber yarn/connection diameter R) is in the range of 0.32 to 2.00, preferably in the range of 0.43 to 1.92, more preferably in the range of 0.65 to 1.55, and further preferably in the range of 0.68 to 1.52.

(17) Note that FIGS. 1 and 2 illustrate a state where the resin yarn 4 is wound around the connection 5 once, but the resin yarn 4 may be wound around the connection 5 twice or more.

(18) In the present embodiment, the case has been described where the terminal end of the first glass fiber yarn 2 and the starting end of the second glass fiber yarn 3 are joined. However, in the glass fiber joined body 1, the starting end of the first glass fiber yarn 2 or the terminal end of the second glass fiber yarn 3 may be joined to another glass fiber yarn or another glass fiber joined body.

(19) Next, examples and comparative examples of the present invention will be illustrated.

EXAMPLES

Example 1

(20) In the present example, first, a glass batch (a raw material of glass), prepared so as to have a composition of E-glass when melted, was melted and pulled out from a bushing provided with a large number of nozzles to form fibers as glass filaments, a binder was applied onto each of the glass filaments, a plurality of glass filaments were then bundled to form the glass fiber yarns 2, 3, and the glass fiber yarns 2, 3 were each wound around a roll to form a roving.

(21) Each of the glass fiber yarns 2, 3 in cross section has 4000 glass filaments bundled, each with a diameter of 17.1 m, and has a mass of 2400 tex.

(22) Next, the terminal end of the glass fiber yarn 2 and the starting end of the glass fiber yarn 3 were taken out of the rovings and superimposed to form the connection 5 having a width W.sub.1 of 30 mm. Next, the resin yarn 4 made of polyamide was wound around the connection 5 by using the splicer (manufactured by Mesdan S.p.A) or the like so that the wound part had a width W.sub.2 being 75% of the width W.sub.1 of the connection 5 and the connection diameter R was 2000 m, to form the glass-fiber-yarn joined body 1 where the glass fiber yarns 2, 3 were joined by the connection 5.

(23) As a result, in the glass-fiber-yarn joined body 1 of the present example, the value of the ratio of mass of the glass fiber yarn 2 or the glass fiber yarn 3 relative to the connection diameter R (mass of glass fiber yarn/connection diameter R) is 1.20 (=2400/2000).

(24) Next, while tension was applied to the glass-fiber-yarn joined body 1 of the present example so that its traveling speed was 15 m/min, a thermoplastic resin as a matrix resin was fused and impregnated into the glass-fiber-yarn joined body 1, which was allowed to pass through the dice for removal of excess resin, whereafter the resin was cured by cooling and the obtained glass-fiber-yarn joined body 1 was cut off to manufacture an intermediate molded body (pellet) of long-fiber-reinforced plastic. Then, injection molding was performed using this pellet to manufacture a molded body of the long-fiber-reinforced plastic. For the manufacturing, 48 glass fiber rovings having 47 connections 5 were used, and evaluations were made as to whether or not the disjoining has occurred, the dice traveling ability, and the opening degree of the connection 5.

(25) Concerning whether or not the disjoining has occurred, for the 47 connections 5, the evaluation was made as when no disjoining had occurred during traveling, and the evaluation was made as X when the disjoining has occurred.

(26) Concerning the dice traveling ability, for the 47 connections 5, the evaluation was made as when the connections 5 had been able to travel while not stuck in the dice, and the evaluation was made as X when the connections 5 had been unable to travel due to being stuck in the dice.

(27) Concerning the opening degree of the connection 5, for 47 pellets including the connections 5, at the time of infiltrating ink from the end of the pellet, the evaluation was made as when no connection 5 had been filtrated with the ink, the evaluation was made as when one or two connections 5 had been filtrated with the ink, and the evaluation was made as X when three or more connections 5 had been filtrated with the ink.

(28) Table 1 shows the results.

Example 2

(29) In the present example, first, in completely the same manner as in Example 1, each of the glass fiber yarns 2, 3 having 4000 glass filaments bundled, each with a diameter of 23.3 m, and having a mass of 4440 tex was wound around a roll to form a roving.

(30) Next, in the same manner as in Example 1, the connection 5 having a width W.sub.1 of 30 mm was formed. Subsequently, the resin yarn 4 made of polypropylene was wound around the connection 5 by using the splicer (manufactured by Mesdan S.p.A) or the like so that the wound part had a width W.sub.2 being 75% of the width W.sub.1 of the connection 5 and the connection diameter R was 3000 m, to form the glass-fiber-yarn joined body 1 in which the glass fiber yarns 2, 3 were joined by the connection 5.

(31) As a result, in the glass-fiber-yarn joined body 1 of the present example, the value of the ratio of mass of the glass fiber yarn 2 or the glass fiber yarn 3 relative to the connection diameter R (mass of glass fiber yarn/connection diameter R) is 1.48 (=4440/3000).

(32) Next, while tension was applied to the glass-fiber-yarn joined body 1 of the present example so that a traveling speed was 10 m/min, a thermosetting resin as a matrix resin was impregnated into the glass-fiber-yarn joined body 1, which was allowed to pass through the dice for removal of excess resin, the obtained glass-fiber-yarn joined body 1 was then wound around a plate, and the resin was cured by hot pressing at 80 C., to manufacture a molded body of the long-fiber-reinforced plastic. For the manufacturing, 48 glass fiber rovings having 47 connections 5 were used, and evaluations were made as to whether or not the disjoining has occurred and the dice traveling ability in completely the same manner as in Example 1, and the opening degree of the connection was evaluated as follows.

(33) Concerning the opening degree of the connection 5, for a molded product including 47 connections 5, the evaluation was made as when no whitening had occurred due to non-impregnation in a portion including the connection 5 after molding, the evaluation was made as when the whitening had occurred in one or two places, and the evaluation was made as X when the whitening had occurred in three or more places.

(34) Table 1 shows the results.

Example 3

(35) In the present example, first, in completely the same manner as in Example 1, each of the glass fiber yarns 2, 3 having 2000 glass filaments bundled, each with a diameter of 23.3 m, and having a mass of 2220 tex was wound around a roll to form a roving.

(36) Next, in the same manner as in Example 2, the glass-fiber-yarn joined body 1 was formed in which the connection 5 had a width W.sub.1 of 30 mm, the wound part had a width W.sub.2 being 75% of the width W.sub.1 of the connection 5, and the connection diameter R was 2000 m.

(37) As a result, in the glass-fiber-yarn joined body 1 of the present example, the value of the ratio of mass of the glass fiber yarn 2 or the glass fiber yarn 3 relative to the connection diameter R (mass of glass fiber yarn/connection diameter R) is 1.11 (=2220/2000).

(38) Next, for the glass-fiber-yarn joined body 1 of the present example, evaluations were made as to whether or not the disjoining has occurred, the dice traveling ability, and the opening degree of the connection 5, in completely the same manner as in Example 2. Table 1 shows the results.

Example 4

(39) In the present example, first, in completely the same manner as in Example 1, each of the glass fiber yarns 2, 3 having 2000 glass filaments bundled, each with a diameter of 16.7 m, and having a mass of 1150 tex was wound around a roll to form a roving.

(40) Next, in the same manner as in Example 2, the glass-fiber-yarn joined body 1 was formed in which the connection 5 had a width W.sub.1 of 30 mm, the wound part had a width W.sub.2 being 75% of the width W.sub.1 of the connection 5, and the connection diameter R was 1500 m.

(41) As a result, in the glass-fiber-yarn joined body 1 of the present example, the value of the ratio of mass of the glass fiber yarn 2 or the glass fiber yarn 3 relative to the connection diameter R (mass of glass fiber yarn/connection diameter R) is 0.77 (=1150/1500)

(42) Next, for the glass-fiber-yarn joined body 1 of the present example, evaluations were made as to whether or not the disjoining has occurred, the dice traveling ability, and the opening degree of the connection 5, in completely the same manner as in Example 2. Table 1 shows the results.

Example 5

(43) In the present example, first, in completely the same manner as in Example 1, each of the glass fiber yarns 2, 3 having 2000 glass filaments bundled, each with a diameter of 16.7 m, and having a mass of 1150 tex was wound around a roll to form a roving.

(44) Next, in the same manner as in Example 1, the glass-fiber-yarn joined body 1 was formed in which the connection 5 had a width W.sub.1 of 30 mm, the wound part had a width W.sub.2 being 75% of the width W.sub.1 of the connection 5, and the connection diameter R was 700 m.

(45) As a result, in the glass-fiber-yarn joined body 1 of the present example, the value of the ratio of mass of the glass fiber yarn 2 or the glass fiber yarn 3 relative to the connection diameter R (mass of glass fiber yarn/connection diameter R) is 1.64 (=1150/700).

(46) Next, for the glass-fiber-yarn joined body 1 of the present example, evaluations were made as to whether or not the disjoining has occurred, the dice traveling ability, and the opening degree of the connection 5, in completely the same manner as in Example 1. Table 1 shows the results.

Example 6

(47) In the present example, first, in completely the same manner as in Example 1, each of the glass fiber yarns 2, 3 having 2000 glass filaments bundled, each with a diameter of 16.7 m, and having a mass of 1150 tex was wound around a roll to form a roving.

(48) Next, in the same manner as in Example 1, the glass-fiber-yarn joined body 1 was formed in which the connection 5 had a width W.sub.1 of 30 mm, the wound part had a width W.sub.2 being 75% of the width W.sub.1 of the connection 5, and the connection diameter R was 2000 m.

(49) As a result, in the glass-fiber-yarn joined body 1 of the present example, the value of the ratio of mass of the glass fiber yarn 2 or the glass fiber yarn 3 relative to the connection diameter R (mass of glass fiber yarn/connection diameter R) is 0.58 (=1150/2000).

(50) Next, for the glass-fiber-yarn joined body 1 of the present example, evaluations were made as to whether or not the disjoining has occurred, the dice traveling ability, and the opening degree of the connection 5, in completely the same manner as in Example 1. Table 1 shows the results.

Comparative Example 1

(51) In the present comparative example, first, in the same manner as in Example 1, each of the glass fiber yarns 2, 3 having 4000 glass filaments bundled, each with a diameter of 17.1 m, and having a mass of 2400 tex was wound around a roll to form a roving.

(52) Next, in completely the same manner as in Example 1, the glass-fiber-yarn joined body 1 was formed in which the connection 5 had a width W.sub.1 of 15 mm, the wound part had a width W.sub.2 being 75% of the width W.sub.1 of the connection 5, and the connection diameter R was 2000 m.

(53) As a result, in the glass-fiber-yarn joined body 1 of the present comparative example, the value of the ratio of mass of the glass fiber yarn 2 or the glass fiber yarn 3 relative to the connection diameter R (mass of glass fiber yarn/connection diameter R) is 1.20 (=2400/2000).

(54) Next, for the glass-fiber-yarn joined body 1 of the present comparative example, evaluations were made as to whether or not the disjoining has occurred, the dice traveling ability, and the opening degree of the connection 5, in completely the same manner as in Example 1. Table 2 shows the results.

Comparative Example 2

(55) In the present comparative example, first, in completely the same manner as in Example 1, each of the glass fiber yarns 2, 3 having 4000 glass filaments bundled, each with a diameter of 17.1 m, and having a mass of 2400 tex was wound around a roll to form a roving.

(56) Next, in completely the same manner as in Example 1, the glass-fiber-yarn joined body 1 was formed in which the connection 5 had a width W.sub.1 of 45 mm, the wound part had a width W.sub.2 being 75% of the width W.sub.1 of the connection 5, and the connection diameter R was 2000 m.

(57) As a result, in the glass-fiber-yarn joined body 1 of the present comparative example, the value of the ratio of mass of the glass fiber yarn 2 or the glass fiber yarn 3 relative to the connection diameter R (mass of glass fiber yarn/connection diameter R) is 1.20 (=2400/2000).

(58) Next, for the glass-fiber-yarn joined body 1 of the present comparative example, evaluations were made as to whether or not the disjoining has occurred, the dice traveling ability, and the opening degree of the connection 5, in completely the same manner as in Example 1. Table 2 shows the results.

Comparative Example 3

(59) In the present comparative example, first, in completely the same manner as in Example 1, each of the glass fiber yarns 2, 3 having 2000 glass filaments bundled, each with a diameter of 23.3 m, and having a mass of 2220 tex was wound around a roll to form a roving.

(60) Next, in completely the same manner as in Example 1, the glass-fiber-yarn joined body 1 was formed in which the connection 5 had a width W.sub.1 of 30 mm, the wound part had a width W.sub.2 being 75% of the width W.sub.1 of the connection 5, and the connection diameter R was 1000 m.

(61) As a result, in the glass-fiber-yarn joined body 1 of the present comparative example, the value of the ratio of mass of the glass fiber yarn 2 or the glass fiber yarn 3 relative to the connection diameter R (mass of glass fiber yarn/connection diameter R) is 2.20 (=2220/1000).

(62) Next, for the glass-fiber-yarn joined body 1 of the present comparative example, evaluations were made as to whether or not the disjoining has occurred, the dice traveling ability, and the opening degree of the connection 5, in completely the same manner as in Example 1. Table 2 shows the results.

Comparative Example 4

(63) In the present comparative example, first, in completely the same manner as in Example 1, each of the glass fiber yarns 2, 3 having 2000 glass filaments bundled, each with a diameter of 16.7 m, and having a mass of 1150 tex was wound around a roll to form a roving.

(64) Next, in completely the same manner as in Example 1, the glass-fiber-yarn joined body 1 was formed in which the connection 5 had a width W.sub.1 of 30 mm, the wound part had a width W.sub.2 being 75% of the width W.sub.1 of the connection 5, and the connection diameter R was 4500 m.

(65) As a result, in the glass-fiber-yarn joined body 1 of the present comparative example, the value of the ratio of mass of the glass fiber yarn 2 or the glass fiber yarn 3 relative to the connection diameter R (mass of glass fiber yarn/connection diameter R) is 0.26 (=1150/4500).

(66) Next, for the glass-fiber-yarn joined body 1 of the present comparative example, evaluations were made as to whether or not the disjoining has occurred, the dice traveling ability, and the opening degree of the connection 5, in completely the same manner as in Example 1. Table 2 shows the results.

Comparative Example 5

(67) In the present comparative example, first, in completely the same manner as in Example 1, each of the glass fiber yarns 2, 3 having 4000 glass filaments bundled, each with a diameter of 17.1 m, and having a mass of 2400 tex was wound around a roll to form a roving.

(68) Next, the terminal end of the glass fiber yarn 2 and the starting end of the glass fiber yarn 3 were taken out of the rovings and joined by a creel to form a glass-fiber-yarn joined body.

(69) Next, for the glass-fiber-yarn joined body of the present comparative example in which the glass fiber yarns 2, 3 were joined by the creel, evaluations were made as to whether or not the disjoining has occurred, the dice traveling ability, and the opening degree of the connection 5, in completely the same manner as in Example 1. Table 2 shows the result.

Comparative Example 6

(70) In the present comparative example, first, in completely the same manner as in Example 1, each of the glass fiber yarns 2, 3 having 4000 glass filaments bundled, each with a diameter of 17.1 m, and having a mass of 2400 tex was wound around a roll to form a roving.

(71) Next, the terminal end of the glass fiber yarn 2 and the starting end of the glass fiber yarn 3 were taken out of the rovings and joined by air-splicing to form a glass-fiber-yarn joined body.

(72) Next, for the glass-fiber-yarn joined body of the present comparative example in which the glass fiber yarns 2, 3 were joined by air-splicing, evaluations were made as to whether or not the disjoining has occurred, the dice traveling ability, and the opening degree of the connection 5, in completely the same manner as in Example 1. Table 2 shows the results.

(73) TABLE-US-00001 TABLE 1 Example 1 2 3 4 5 6 Glass filament diameter 17.1 23.3 23.3 16.7 16.7 16.7 (m) Number of glass filaments 4000 4000 2000 2000 2000 2000 bundled (filaments) Mass of glass fiber yarn 2400 4440 2220 1150 1150 1150 (tex) Type of matrix resin thermoplastic thermosetting thermosetting thermosetting thermoplastic thermoplastic Type of resin yarn PA PP PP PP PA PA Connection width W.sub.1 (mm) 30 30 30 30 30 30 Connection diameter (m) 2000 3000 2000 1500 700 2000 (Mass of glass fiber yarn/ 1.20 1.48 1.11 0.77 1.64 0.58 Connection diameter R) Disjoining Dice traveling ability Opening degree of connection

(74) TABLE-US-00002 TABLE 2 Comparative Example 1 2 3 4 5 6 Glass filament diameter (m) 17.1 17.1 23.3 16.7 17.1 17.1 Number of glass filaments 4000 4000 2000 2000 4000 4000 bundled (filaments) Mass of glass fiber yarn (tex) 2400 2400 2220 1150 2400 2400 Type of matrix resin thermoplastic thermoplastic thermoplastic thermoplastic thermoplastic thermoplastic Type of resin yarn PA PA PA PA Connection width W.sub.1 (mm) 15 45 30 30 Connection diameter (m) 2000 2000 1000 4500 (Mass of glass fiber yarn/ 1.20 1.20 2.22 0.26 Connection diameter R) Disjoining X X Dice traveling ability X X X Opening degree of connection X X X

(75) It is apparent from Table 1 that, according to the glass-fiber-yarn joined bodies 1 of Examples 1 to 6 of the present invention, no disjoining occurs upon application of tension, the dice traveling ability is favorable, the passage through the dice is possible without trouble after the impregnation of the resin, the connection 5 has a favorable opening degree, and excellent appearance quality can be obtained in a molded product. Particularly in each of the glass fiber joined bodies 1 of Examples 1 to 4 where the value of the ratio of mass of the glass fiber yarn 2 or the glass fiber yarn 3 relative to the connection diameter R (mass of glass fiber yarn/connection diameter) is in the range of 0.64 to 1.55, the opening degree of the connection 5 is particularly favorable and the resin impregnability in the connection 5 is particularly high, so that it is possible to obtain a glass-fiber-reinforced resin molded product particularly excellent in appearance quality.

(76) On the other hand, from Table 2, according to the glass-fiber-yarn joined body 1 of Comparative Example 1 where the width W.sub.1 of the connection 5 is 15 mm which is smaller than 20 mm, the disjoining occurs upon application of tension, and according to the glass-fiber-yarn joined body 1 of Comparative Example 2 where the width W.sub.1 of the connection 5 is 45 mm which is larger than 40 mm, trouble occurs at the time of the passage through the dice after the impregnation of the resin.

(77) Further, according to the glass-fiber-yarn joined body 1 of Comparative Example 3 where the value of the ratio of mass of the glass fiber yarn 2 or the glass fiber yarn 3 relative to the connection diameter R (mass of glass fiber yarn/connection diameter R) is 2.22 which is more than 2.00, the opening degree of the connection 5 is low, and according to the glass-fiber-yarn joined body 1 of Comparative Example 4 where the value of the ratio is 0.26 which is less than 0.32, trouble occurs at the time of the passage through the dice after the impregnation of the resin, and the opening degree of the connection 5 is low, in addition to that trouble occurs at the time of the passage through the dice after the impregnation of the resin.

(78) Moreover, with the glass-fiber-yarn joined body of Comparative Example 5 where the glass fiber yarns 2, 3 are joined by the creel, the opening degree of the connection 5 is low in addition to that trouble occurs at the time of the passage through the dice after the impregnation of the resin, and with the glass fiber joined body of Comparative Example 6 where the glass fiber yarns 2, 3 are joined by air-splicing, the disjoining occurs upon application of tension.