JP3725366B2 - How to join mixed fiber mats - Google Patents

Description

The present invention relates to a splicing method for a mixed fiber mat in which the ends of at least two mixed fiber mats composed of reinforcing fibers and thermoplastic resin fabric are joined to each other.
[0001]
[Prior art]
Conventionally, as a method for producing a continuous fiber reinforced thermoplastic sheet, a thermoplastic resin in the mat is obtained by continuously heating and pressurizing what is wound by connecting a plurality of mixed fiber mats composed of reinforcing fibers and thermoplastic resin fibers. It is known that a resin is melted to form a continuous molded product such as a fiber-reinforced thermoplastic sheet (see Japanese Patent Publication No. 61-130345).
[0002]
When a continuous long fiber-reinforced thermoplastic sheet is formed from this mixed fiber mat, it is necessary to join a large number of mixed fiber mats. This is because the mixed fiber mat has a large thickness, and when wound around a paper core or the like, a long one cannot be wound. Therefore, a large number of mixed fiber mats are required to obtain a continuous molded product of a fiber reinforced thermoplastic sheet. This is because it is necessary to succeed.
[0003]
Conventionally, as a method of connecting the ends of two mixed fiber mats, as shown in FIG. 7, the ends 1a and 1a of the two mixed fiber mats 1 and 1 are abutted to each other, and the ends 1a and 1a. Sewing them together with a thread 2 such as organic fiber or glass using a sewing machine or the like.
[0004]
[Problems to be solved by the present invention]
When the mixed fiber mats 1 and 1 are joined in such a conventional method, the tensile strength of the joining portion A (loose portion) is based on the strength of the yarn 2 joined by a sewing machine or the like. For this reason, when a continuous long fiber-reinforced thermoplastic sheet is formed from a large number of mixed fiber mats 1, if a tensile force is applied to the joint A, the joint A will be broken by this tension. There are problems.
[0005]
In addition, when the mixed fiber mat is continuously formed into a sheet by the joined shrinkage method, there is a problem that a portion with little overlap is thin or scraped (perforated). In contrast, if the overlap is large, the thickness of the joining portion A (joint portion) increases, and the quality as a fiber-reinforced thermoplastic sheet may not be satisfied.
[0006]
Accordingly, an object of the present invention is to provide a splicing method for a mixed fiber mat that does not cause breakage of the bonded portion and does not deteriorate the quality of the bonded portion when the mixed fiber mat is formed into a sheet. It is.
[0007]
[Means for Solving the Invention]
In order to achieve this object, the invention of claim 1 is directed to a splicing method of a mixed fiber mat in which ends of at least two mixed fiber mats made of reinforcing fibers and thermoplastic resin fabric are joined to each other. After applying the process of releasing the fiber entanglement to the end where the mat is joined, and overlapping the two ends that have been processed, When the thickness of the overlapped portion between the ends is measured by the thickness measuring means, and the measured value is a predetermined thickness, The splicing method of the mixed fiber mat is characterized in that the overlapping portion between the end portions is punched with a needle punch and integrated.
[0008]
[Shape Bear]
Next, an embodiment of the present invention will be described with reference to FIGS.
[Constitution]
FIG. 1 is an explanatory view showing a method of joining (joining) the mixed fiber mats manufactured by the mat manufacturing apparatus of FIG. 2, and FIG. 2 is a mixture of reinforcing fibers and thermoplastic resin fibers cut to an appropriate length. FIG. 3 shows a mixed fiber mat roll manufacturing apparatus that manufactures a mixed fiber mat from the fiber 10 to make a roll, and FIG. 3 manufactures a fiber reinforced thermoplastic sheet from the mixed fiber mat roll manufactured by the mixed fiber mat roll manufacturing apparatus of FIG. 1 shows an apparatus for manufacturing a fiber-reinforced thermoplastic sheet.
First, the material of the mixed fiber 10 will be described, and then the mixed fiber mat roll manufacturing apparatus and the fiber reinforced thermoplastic sheet manufacturing apparatus will be described.
<Material of synthetic fiber 10>
The mixed fiber 10 has a reinforcing fiber and a thermoplastic resin material cut to an appropriate length.
(Reinforced fiber)
Here, the reinforcing fibers are those which are thermally stable at the melting temperature of the thermoplastic resin used, for example, inorganic fibers such as glass fibers, carbon fibers and ceramic fibers, organic fibers such as polyamide fibers and polyester fibers, and metal fibers. Can be used as long as the fiber has a tensile elastic modulus of 10 GPa or more.
[0009]
The diameter of the monofilament of the reinforcing fiber is preferably 1 to 50 μm, and desirably 2 to 30 μm. If the diameter is less than 1 μm, the strength of the resulting fiber-reinforced thermoplastic sheet is not sufficient. Conversely, if it exceeds 50 μm, it is difficult to spread the resin between the fibers and connect the fibers with the resin. Strength cannot be expressed.
[0010]
Here, the reinforcing fiber is, for example, carbon fiber (CF) having a diameter of 10 μm and an average length of about 50 mm.
(Thermoplastic fiber)
Any thermoplastic resin fiber can be used as long as it is obtained as a fiber.
Examples thereof include olefin resins such as polyethylene and polypropylene, nylon, acrylonitrile, and polyethylene terephthalate (PET). The thermoplastic resin material is in the form of powder, for example, olefin resin such as polyethylene and polypropylene, polyvinyl chloride, polystyrene, polyamide, polycarbonate, polyphenylene sulfide, polysulfone, polyether ether ketone, and the like. A plastic elastomer is mentioned.
[0011]
This thermoplastic resin may be used alone or in combination with other materials, such as heat stabilizers, plasticizers, lubricants, antioxidants, ultraviolet absorbers, pigments, inorganic fillers, reinforcing monofilaments, etc. Additives, fillers, processing aids, modifiers and the like may be added.
[0012]
Here, the thermoplastic resin fiber is, for example, a PET fiber having a diameter of 20 μm and an average length of 50 mm.
<Mixed fiber mat roll manufacturing equipment>
The mixed fiber mat roll manufacturing apparatus of FIG. 2 includes fiber receiving tanks (material receiving portions) 11 and 11, fiber take-out devices (fiber take-out means) 12 and 12 that take out the mixed fibers 10 supplied to the fiber tanks 11 and 11, and , Defibrating device (defibrating means) 13 and 13 for defibrating the mixed fiber 10 taken out by the fiber take-out devices 12 and 12, and defibrated mixed fibers 10a and 10b defibrated by the defibrating devices 13 and 13 The fiber conveyors 14 and 14 for feeding the fiber, the laminating conveyor 15 for receiving and laminating the defibrated mixed fibers 10a and 10b conveyed by the fiber conveyors 14 and 14, and the laminated defibrated mixed fibers 10a and 10b are compressed. And a compression roller 16 serving as a mixed fiber mat.
[0013]
Further, the mixed fiber mat roll manufacturing apparatus includes a cutting device 31 that cuts the mixed fiber mat 1 compressed by the compression roller 16 into an appropriate length set in advance.
The cutting device 31 is disposed above the moving path of the mixed fiber mat 1 and is moved below the moving path of the mixed fiber mat 1 by a movable cutting blade 31a that is driven up and down by a driving means (not shown). A fixed blade 31b is provided.
[0014]
Furthermore, the mixed fiber mat roll manufacturing apparatus is provided with driving rolls 32 and 32 for feeding the cut mixed fiber mat 1, and tearing treatment for tearing the ends of the mixed fiber mat 1 in cooperation with the driving rolls 32 and 32. A tool (end fiber entanglement releasing means, that is, an end fiber entanglement releasing jig) 33 and a feed side end of the mixed fiber mat 1 supplied later on the rear end of the mixed fiber mat 1 sent earlier. The driving rolls 34 and 34 to be overlapped, the feeler 35a of the height measuring sensor (thickness measuring means) 35, and the overlapping portion B of the ends of the mixed fiber mats 1 and 1 sequentially supplied are joined (joined (connected). )) A needle punch 17 and a mat winder 18 for winding the mixed fiber mat joined by the needle punch 17 are provided. Reference numeral 18 a denotes a mixed fiber mat roll wound around the mat winder 18. Reference numeral 17 b denotes a plate that is a receiving member for the needle punch 17.
[0015]
In FIG. 2, the needle punch 17 and the height measuring sensor 37 are shown side by side in the feed direction of the mixed fiber mat 1 for the convenience of illustration, but in practice, the mixed fiber mats 1, 1 as shown in FIG. Arranged on both sides of the overlapping portion B. In addition, the needle punch 17 and the height measuring sensor 37 are provided so as to be movable on the overlapping portion B by a driving means (not shown) and can be driven up and down by a driving means (lifting driving means) (not shown).
[0016]
In FIG. 1B, the tear jig 33 is shown in the vicinity of the needle punch 17 for convenience of explanation. As shown in FIG. 1B, the tearing jigs 33 and 34 have a plate 33a and a large number of blades 33b protruding on the plate 33a and arranged at equal pitches in the width direction.
[0017]
The fiber take-out device (fiber take-out means) 12 is fed by a conveyor 19 that takes out the mixed fiber 10 supplied to the fiber receiving tank 11 to the outside of the tank, a conveyor 20 that moves the taken out mixed fiber 10 downward, and a conveyor 20. It has the conveyor 21 which moves the mixed fiber 10 to the defibrating apparatus 13 to a horizontal direction.
[0018]
The defibrating apparatus 13 includes a large-diameter defibrating roller 22 and a large number of small-diameter and medium-diameter defibrating rollers 23 to 27 disposed around the upper side of the defibrating roller 22.
The fiber conveying device 14 includes an upper conveyor 29 oriented in the horizontal direction and an inclined conveyor 30 that is inclined downward.
<Fiber-reinforced thermoplastic sheet manufacturing equipment>
The fiber reinforced thermoplastic sheet manufacturing apparatus of FIG. 3 includes a mat feeding machine 40, a mixed fiber mat roll 18a of the mat feeding machine 40, a heating furnace 41 disposed adjacent to the mat feeding machine 40, and a heating furnace 41. And far-infrared heaters 42 and 42 for heating the mixed fiber mat 1.
[0020]
Further, the resin manufacturing apparatus sandwiches the heated mixed fiber mat 1 from above and sends it out, so that the heated mixed fiber mat 1 is formed into a thin sheet S by heating pinch rolls 43 and 43, and the thinned resin sheet S. Is provided with cooling pinch rolls 44 and 44 for cooling the resin sheet S which has been rolled thin.
[0021]
Furthermore, the fiber reinforced thermoplastic sheet manufacturing apparatus includes take-up rolls 45 and 45 that take up the cooled resin sheet S, and a sheet winder 46 that takes up the resin sheet S taken up by the take-up rolls 45 and 45. 47 is a sheet roll wound up by the sheet winder 46.
[Action]
・ Manufacturing method of mixed fiber mat roll
Next, a method for manufacturing a mixed fiber mat roll using the above-described mixed fiber mat roll manufacturing apparatus will be described.
[0022]
First, mixed fibers 10 and 10 of reinforcing fibers and thermoplastic resin fibers cut to an appropriate length are supplied to fiber receiving tanks (material receiving portions) 11 and 11 by air or the like. The mixed fibers 10 supplied to the fiber receiving tanks 11, 11 are taken out from the fiber receiving tank 11 by the conveyor 19, then moved downward by the conveyor 20, and each defibrating device 13 is horizontally moved by the conveyor 21. , 13. The defibrating apparatus 13, 13 defibrates the supplied mixed fiber with a large-diameter defibrating roller 22 and a large number of small-diameter and medium-diameter defibrating rollers 23 to 27, and defibrated mixed fibers. 10a and 10b are supplied onto the conveyors 29 and 29 of the fiber conveying devices 14 and 14, respectively. The defibrated mixed fibers 10a and 10b are transported in opposite directions by the conveyors 29 and 29 and then moved onto the laminated conveyor 15 by the inclined conveyors 30 and 30 that are inclined downward. The laminating conveyor 15 moves the supplied defibrated mixed fibers 10a and 10a to the compression roller 16 side, thereby laminating the defibrated mixed fibers 10b on the defibrated mixed fibers 10a.
[0023]
The laminated defibrated mixed fibers 10a and 10a are compressed by the compression roller 16 and formed into a mixed fiber mat. The mixed fiber mat 1 is cut to an appropriate length set in advance by the cutting device 31, and then the feed side end is moved onto the tear jig 33 by the drive rolls 32 and 32.
[0024]
Then, in a state where the moving side end portion of the mixed fiber mat 1 is prevented from moving upward by a pressing means (not shown), the tear jig 33 is raised upward by a driving means (not shown) to move the mixed fiber mat 1. The side end is placed on the plate 33 a of the tearing jig 33. Thereby, many blades 33a of the plate 33a of the tearing jig 33 pierce the moving side end portion of the mixed fiber mat 1, and the tip portion protrudes upward. Next, the mixed fiber mat 1 is moved to the left in FIG. 1 (d) and FIG. 2 by the drive rolls 32, 32, and the tearing portion 1b as shown in FIG. To form. Thereby, a part of the fiber of the tearing portion 1b is released (see the mixed fiber mat 1 on the upper side of (a1) and (b1) in FIG. 1A).
[0025]
Thereafter, the tearing jig 33 is lowered downward by a driving means (not shown), the plate 33a of the tearing jig 33 is separated downward from the moving side end of the mixed fiber mat 1, and mixed by the driving rolls 32 and 32. The fiber mat 1 is fed to the right in FIG. 2, and the feed end is moved up to the tear jig 33 with respect to the feed side of the mixed fiber mat 1.
[0026]
Then, in a state where the rear end portion of the mixed fiber mat 1 is prevented from moving upward by a pressing means (not shown), the tear jig 33 is raised upward by a driving means (not shown) to move the mixed fiber mat 1. The side end is placed on the plate 33 a of the tearing jig 33. Thereby, many blades 33a of the plate 33a of the tearing jig 33 are pierced into the rear end portion of the mixed fiber mat 1, and the front end portion protrudes upward.
[0027]
Next, the mixed fiber mat 1 is moved rightward in FIG. 2 by the drive rolls 34 and 34, and a tearing portion 1 b as shown in FIG. 1A is formed at the rear end portion of the mixed fiber mat 1. Thereby, a part of fiber of the tearing part 1b is released (see (a2) in FIG. 1A). FIG. 1 (a2) is shown to show the shape of the mixed fiber mat 1 below (a1) in FIG. 1 (a).
[0028]
Thereafter, the tearing jig 33 is lowered downward by a driving means (not shown), the plate 33a of the tearing jig 33 is separated downward from the moving side end of the mixed fiber mat 1, and mixed by the driving rolls 34, 34. The fiber mat 1 is fed to the right in FIG. 2 and the feeding fiber end of the mixed fiber mat 1 is overlapped on the rear end of the mixed fiber mat 1 that has been fed first, so that the ends of the mixed fiber mats 1 and 1 are connected to each other. The overlapping portion B is provided.
[0029]
Next, the height measuring sensor 35 is moved onto the overlapping portion B by a driving means (not shown) and lowered to bring the feeler 35a of the height measuring sensor 35 into contact with the overlapping portion B, so that the overlapping portion The thickness a of B is measured.
[0030]
If the thickness a is a predetermined value as a result of this measurement, the height measuring sensor 35 is moved upward by a driving means (not shown), and then retreated from the overlapping portion B by a driving means (not shown) to drive the driving means (not shown). After the needle punch 17 is moved onto the overlapping portion B by the above-described operation, the needle punch 17 is lowered by a driving means (not shown), and the overlapping portion B is needled (needle punching) with the needle 17a of the needle punch 17. ), The fibers of the overlapping portion B of the mixed fiber mats 1 and 1 are entangled, and the ends of the mixed fiber mats 1 and 1 are integrated. The mixed fiber mats 1 and 1 integrated by this joining are wound up by a winding roller 18 to form a mixed fiber mat roll 18a.
-Resin sheet manufacturing method using fiber reinforced thermoplastic sheet manufacturing equipment
Further, the mixed fiber mat roll 18a manufactured in this way is held by the mat feeding machine 40 of the fiber reinforced thermoplastic sheet manufacturing apparatus of FIG. 3, and the mixed fiber mat 1a is fed from the mixed fiber mat roll 18a of the mat feeding machine 40. And the fed mixed fiber mat 1 is passed through the heating furnace 41. At this time, the mixed fiber mat 1 is heated by the upper and lower far infrared heaters 42 and 42 in the heating furnace 41.
[0031]
Then, the heated mixed fiber mat 1 is sandwiched from above and below by the heated pinch rolls 43 and 43 and fed out, and the heated mixed fiber mat 1 is rolled and thinned by the heated pinch rolls 43 and 43 to form the sheet S. The thinned sheet S is cooled by the cooling pinch rolls 44 and 44. Next, the cooled sheet S is taken up by the take-up rolls 45, 45 and then taken up by the sheet take-up machine 46, whereby the sheet roll 47 is formed.
[Description of Examples]
[0032]
[Example 1]
1. A mat-like mixture of mixed fibers composed of thermoplastic resin and reinforcing fibers
As the material of the mixed fiber 10, carbon fiber (CF) having a diameter of about 10 μm and an average length of about 50 mm and polyethylene terephthalate (PET) fiber having a diameter of about 20 μm and an average length of about 50 mm were used. Then, using the mixed fiber mat roll manufacturing apparatus of FIG. 2, the mixed fibers 10 are averagely mixed while being defibrated by the defibrating device 13, and the averaged defibrated mixed fibers 10 a and 10 b are laminated conveyors. 15 is laminated. The defibrated mixed fibers 10a and 10b laminated on the laminated conveyor 15 are compressed by a compression roller 16 to form a mixed fiber mat, and the mixed fiber mat is cut into an appropriate length.
2. How to splice mixed fiber mats
As described above, the tear portions 1b and 1b are formed at the joint ends corresponding to each other of the mixed fiber mats 1 and 1, and the joint ends corresponding to each other of the mixed fiber mats 1 and 1 are overlapped with each other. Edges Overlapping part B is measured by the feeler 35a of the height measuring sensor 35. When the thickness of the overlapping portion B is a predetermined thickness, the overlapping portion B is punched by the needle punch 17, and the fibers of the overlapping portion B are bonded to each other. The entangled portion B was integrated by entanglement.
3. Other
The molding speed of the mixed fiber mat in this example was 3 m / min.
The obtained mixed fiber mat had a basis weight of about 450 g / m 2 and CF: PET: 40: 60 (wt%). Moreover, the thickness of the mixed fiber mat was 7 mm on average.
[0033]
Furthermore, 100 m of the obtained mixed fiber mat was wound around a paper core using a winding roller 18 to obtain a mixed fiber mat roll 18a as shown in FIG.
[0034]
The melting temperature of PET is 255 ° C.
[0035]
And the fiber reinforced thermoplastic sheet | seat was shape | molded from the mixed fiber mat roll 18a obtained using the fiber reinforced thermoplastic sheet manufacturing apparatus shown in FIG.
In addition, the specification of the fiber reinforced thermoplastic sheet manufacturing apparatus shown in FIG. 3 was set as follows.
(1) Specifications of fiber reinforced thermoplastic sheet manufacturing equipment
Heating furnace 41
・ Install 6 far-infrared heaters 42 above and below
-Set the ambient temperature of the mat passage in the heating furnace 41 to 285 ° C
Heating pinch rolls 43, 43
・ The heating pinch roll 43 sets the roll surface temperature to 100 ° C.
・ The diameter of the heated pinch roll 43 is 250 mm.
-The pinching pressure (pressing force) by the heating pinch rolls 43, 43 was 50 kgf / cm as linear pressure.
Cooling binch rolls 44, 44
・ Cooling pinch roll 44 has a surface temperature of 30 ° C.
・ The diameter of the cooling pinch roll 44 is 250 mm.
The clamping pressure (pressing force) by the cooling pinch rolls 44, 44 was 50 kgf / cm in linear pressure.
(2) Fiber reinforced thermoplastic sheet obtained by this apparatus
In the case of producing a fiber reinforced thermoplastic sheet from a mixed fiber mat using the fiber reinforced thermoplastic sheet production apparatus shown in FIG. 3, the line speed was 1.5 m / min.
And the fiber reinforced thermoplastic sheet of width 500mm was obtained with this apparatus.
[0036]
[Example 2]
<End splicing method of mixed fiber mat>
FIG. 4 shows Embodiment 2 of the present invention.
In this embodiment, in addition to the configuration of the first embodiment, the mixed fiber mats 1 and 1 subjected to the tearing process on the end portions 1a and 1a are overlapped as shown in FIG. When punching the overlapping portion B of the portions 1a and 1a with the needle punch 17, the periphery of the many needles 17a of the needle punch 17 is pressed with a pressing plate (pressing member) 50 as shown in FIG. An example in which the overlapping portion B is punched by the needle 17a of the needle punch 17 through a large number of insertion holes 50a provided in FIG.
[0037]
Since it is the same as Example 1 except the point which used this pressing member 50, the description is abbreviate | omitted.
[0038]
[Example 3]
FIG. 5 shows Embodiment 3 of the present invention.
In this embodiment, instead of the tear jig 33 used in the first and second embodiments, a jig with a needle (brush) 51 provided with a plurality of (many) needles 51a shown in FIG. After the entanglement of the fibers at the end of the mixed fiber mat 1 is once released and the ends 1a, 1a of the mixed fiber mats 1, 1 whose entanglements are released are overlapped at the position of FIG. 5 (b). The overlapping portion B between the end portions 1a and 1a is punched by the needle punch 17, and the fibers of the overlapping portion B are entangled so that the overlapping portion B is integrated.
1 c is a fiber entanglement release portion provided at the end 1 a of the mixed fiber mat 1.
[0039]
Since this jig with a needle (brush) 51 is the same as that of the first embodiment except that it is used as an end fiber entanglement releasing means (end fiber entanglement release jig), description thereof is omitted.
[0040]
[Example 4]
FIG. 6 shows Embodiment 4 of the present invention.
In this embodiment, the end portions 1a and 1a of the mixed fiber mats 1 and 1 shown in FIG. 6A are overlapped with each other, and the overlapping portion B of the end portions 1a and 1a is as shown in FIG. 6B. By simultaneously pressing against the plate 33a of the tearing jig 33, piercing with a large number of blades 33b of the tearing jig 33, and pulling the mixed fiber mats 1 and 1 in opposite directions as indicated by arrows in FIG. The tearing portions 1b and 1b are simultaneously formed on the end portions 1a and 1a of the mixed fiber mats 1 and 1, respectively. Then, as shown in FIG. 6C, by punching the overlapping portion B of the end portions 1a, 1a of the mixed fiber mat 1, 1 in which the tear portions 1b, 1b are formed at the same time with the needle punch 17. The fibers of the overlapping portion B are entangled with each other so that the overlapping portion B is integrated.
[0041]
Other than this point, the second embodiment is the same as the first embodiment, and a description thereof is omitted.
[Description of comparative example]
[0042]
[Comparative Example 1]
The end portions of the mixed fiber mats 1, 1 are butted together as shown in FIG. 7 and stitched together with the glass thread 2 to obtain a fiber-reinforced thermoplastic sheet using the fiber-reinforced thermoplastic sheet manufacturing apparatus shown in FIG. The specifications of this fiber-reinforced thermoplastic sheet manufacturing apparatus are the same as those in Example 1.
[0043]
[Comparative Example 2]
Tear processing is performed separately on the ends of the two mixed fiber mats to be joined, the two processed ends are overlapped, and the overlapping portion of the two ends is punched with a needle punch. Thus, the fibers in the overlapping portion were entangled to integrate the two ends. The mixed fiber mat joined in this manner was used as a fiber reinforced thermoplastic sheet by the fiber reinforced thermoplastic sheet manufacturing apparatus of FIG. The specifications of this fiber-reinforced thermoplastic sheet manufacturing apparatus are the same as those in Example 1.
[Comparison between Examples and Comparative Examples]
(1) Comparison between Examples 1 to 3 and Comparative Example 1
The mixed fiber mats obtained in Examples 1 to 3 and Comparative Example 1 described above are connected every 100 m to create 500 m of mixed fiber mats 1 and 1, and fiber reinforced with the fiber reinforced thermoplastic sheet manufacturing apparatus shown in FIG. The results of molding the thermoplastic sheet are shown in Table 1 below.
[0044]
[Table 1]
Breaking during forming Tensile strength of sheet
Example 1 (0/5) times 8.5 kgf / mm @ 2
Example 2 (0/5) times 8.0 kgf / mm @ 2
Example 3 (0/5) times 8.0 kgf / mm @ 2
Comparative Example 1 (2/5) times 3.2 kgf / mm @ 2
As can be seen from the comparison results, the samples of Examples 1 to 3 had a sheet tensile strength far greater than the conventional splicing method of the mixed fiber mat shown in Comparative Example 1.
(2) Comparison between Example 4 and Comparative Examples 1 and 2
The mixed fiber mats obtained in Example 4 and Comparative Examples 1 and 2 described above are connected every 100 m to create 500 m of mixed fiber mats 1 and 1, and fiber reinforced with the fiber reinforced thermoplastic sheet manufacturing apparatus shown in FIG. The results of molding of the thermoplastic sheet are shown in Table 2 below.
[0045]
[Table 2]
Breaking during forming Sheet tensile strength Edge processing time
Example 4 (0/5) times 7.5 kgf / mm @ 2 80 seconds
Comparative Example 1 (2/5) times 3.2 kgf / mm @ 2 180 seconds
Comparative Example 2 (2/5) times 7.0 kgf / mm @ 2 200 seconds
As can be seen from the comparison result, the strength of Example 4 was much higher than that of the conventional splicing method of the mixed fiber mat shown in Comparative Example 1. Moreover, the thing of Example 4 can obtain the tensile strength of a sheet | seat larger than the thing of the comparative example 2 which connected what gave the tearing process to the edge part of two mixed fiber mats with the needle punch. It was.
[0046]
In addition, the method shown by embodiment of the invention demonstrated above and the method of each Examples 1-4 can also be performed independently, and can be performed combining these.
[0047]
【The invention's effect】
As described above, the invention according to claim 1 is a method for joining mixed fiber mats in which the ends of at least two mixed fiber mats made of reinforcing fibers and thermoplastic resin fibers are joined to each other. After processing the fiber entanglement release at the end to be joined and overlapping the two ends subjected to this processing, the thickness of the overlapped portion between the ends is measured by the thickness measuring means, and the measurement is performed. When the value is a predetermined thickness, the overlapping portion of the end portions of the two mixed fiber mats is integrated by punching the overlapping portion of the end portions with a needle punch and integrating them. During the integration by the needle punch, the end portions can be stably connected. Moreover, when the mixed fiber mat is formed into a sheet, it is possible to prevent the joined portion from being broken and the quality of the joined portion from being deteriorated. That is, the shape of the joint portion is the same as the portion other than the joint, and the problem that the joint portion (joint portion) is broken by tension is solved. Further, the thickness of the overlapping portion was almost the same as the portion other than the joint.
[Brief description of the drawings]
1A is an explanatory diagram of a splicing method of a mixed fiber mat according to the present invention, FIG. 1B is an explanatory diagram of a height measurement sensor, a needle punch, etc. of FIG. 2, and FIG. It is explanatory drawing of the tear jig | tool of b).
FIG. 2 is an explanatory view showing an example of a mixed fiber mat roll manufacturing apparatus.
FIG. 3 is an explanatory view showing an example of a fiber-reinforced thermoplastic sheet manufacturing apparatus.
FIG. 4 is an explanatory view showing another example of the splicing method of the mixed fiber mat according to the present invention.
FIG. 5 is an explanatory view showing still another example of the splicing method of the mixed fiber mat according to the present invention.
FIGS. 6A and 6B are explanatory views of a method for tearing the end portion of the mixed fiber mat, and FIG. 6C is a method for joining the mixed fiber mat whose end portion is torn by FIGS. It is explanatory drawing shown.
FIG. 7 is an explanatory view of a conventional method for splicing a mixed fiber mat.
[Explanation of symbols]
1 Mixed fiber mat
1a end
1b tearing part
17 Needle punch
33 Tearing jig
33a plate
33b blade
35 Height measuring sensor
50 Holding plate (holding member)
51 Jig with needle (brush)
51a needle
B Superposition part

Claims (1)

In the splicing method of the mixed fiber mat in which the ends of at least two mixed fiber mats made of reinforcing fiber and thermoplastic resin fabric are joined together,
The end portion where the two mixed fiber mats are joined is subjected to fiber entanglement release processing, the two end portions subjected to this processing are overlapped, and then the thickness of the overlapping portion between the end portions is measured by thickness measuring means. A method for splicing a mixed fiber mat, characterized in that when the measured value is a predetermined thickness, the overlapping portion of the end portions is punched and integrated with a needle punch.

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