JPS6228221B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for industrially producing a thin and homogeneous extended fiber sheet suitable as a material for nonwoven fabric. Conventionally, non-woven sheets composed of long fibers have been made into webs by randomly randomizing spun long fiber bundles at once using an air flow or static electricity, or by directly indexing fibers near a spinning nozzle using an air flow. Randomized versions are also known. These methods are called spunbond methods,
Not only does this method require very large equipment, but it is not easy to stop and start the equipment. In addition, the nonwoven fabric obtained by this method does not necessarily have good uniformity of single fiber physical properties and uniformity of basis weight distribution, and the type of polymer constituting the fibers is limited, and the physical properties of the nonwoven fabric are also limited. There were some drawbacks, such as the fact that it was Moreover, such nonwoven fabrics do not have satisfactory drapability or uniformity, and their use is particularly limited to civil engineering applications where thick fabrics are desired. On the other hand, various attempts have been made to improve these drawbacks and to develop nonwoven fabrics that are particularly thin, uniform, and have excellent drapability, but they have not yet been commercially successful. The present inventors first opened the crimped tow so that the fibers were substantially aligned in one direction, and then stacked one or more long fiber parallel sheets bonded with an adhesive to create a wide proposed a method to make a reticular fiber sheet by stretching it in the direction of
No., Japanese Patent Publication No. 48-61772). According to this method, it is possible to manufacture a new reticulated fiber sheet, but it is difficult to spread it uniformly and obtain a thin and homogeneous fiber sheet, which is one of the problems in industrialization. was. SUMMARY OF THE INVENTION An object of the present invention is to provide a method for producing a stretched long fiber sheet that can be used as a material for a thin and uniform long fiber nonwoven fabric. Such an object of the present invention is that long fibers having 10 to 30 crimps per inch are substantially arranged in the vertical direction and are partially intertwined, and the average distance between the intertwining points of the fibers is equal to the fiber diameter. A long fiber parallel sheet in which the intertwining points are at least partially joined by an adhesive, and
Moreover, the strength of the sheet in the horizontal direction is 1 to 40.
(g/m)/(g/m ² ), and the partial elongation of any part of the sheet when a load of the same value as the strength of the sheet is applied in the horizontal direction of the sheet. After laminating two or more long fiber parallel sheets having an elongation value within the range of 70 to 130% of the sheet so that the fiber arrangement is substantially parallel,
0.5 to 1.1 of the elongation value of the sheet in the horizontal direction
This is achieved by the method for producing a stretched filament sheet of the present invention, which is characterized in that the filament is stretched twice and then, if necessary, the filaments are at least partially bonded to each other with an adhesive. The present inventors first developed a long fiber parallel sheet, which is a raw material for producing a long fiber stretched sheet, which is substantially arranged in the vertical direction and partially entwined or joined, and then stretched it in the horizontal direction to make it homogeneous. We have conducted repeated research on the properties suitable for obtaining long-fiber stretched sheets. Generally, the stress when a long fiber parallel sheet is stretched in the horizontal direction is the result of the mutual influence of the bonding force of the long fibers at the intertwining point of the long fibers, the frictional resistance due to sliding between the long fibers, the bending stress of the fibers, etc. During spreading, a uniform spreading behavior may be exhibited even if a portion of the joint at the intertwined point is separated and the fibers are shifted. Therefore, the average intertwining point distance of the long fiber parallel sheet is the same or smaller than that of the long fiber extended sheet. Thus, according to the research conducted by the present inventors, a long fiber parallel sheet suitable for producing a homogeneous and thin long fiber extended sheet has the following properties: (1) Long fibers having 10 to 30 crimps per inch are substantially The fibers are arranged in the vertical direction and are partially intertwined so that the average distance between the intertwined points is within the range of 3 to 300 times, preferably 5 to 100 times the fiber diameter, and the intertwined points (2) The strength of the sheet when pulled in the horizontal direction is 1.
~40 (g/m)/(g/m ² ), preferably the elongation at that time is in the range of 400 to 2000%, and (3) the sheet has the same load as the above-mentioned strength. It is necessary that the partial elongation when applied to the sheet in the horizontal direction is in the range of 70 to 130% of the elongation value of the sheet at any part. It was found that The "strength", "elongation" and "partial elongation" which define the properties of the long fiber parallel sheet in the present invention are values measured by the following method. (a) Measurement of strength: "Strength" in a long fiber parallel sheet means the maximum strength when both ends in the horizontal direction are gripped and pulled. (The width can be left as long as it actually is.) Fold it in quarters to make a width of 2.5 cm. This is the maximum strength when grasping both ends and pulling. By folding it in quarters and measuring it, you can prevent stress from occurring in the tearing direction when you pull the 10cm wide cut piece as it is. Specifically, the area weight A (g/m ² )
If the maximum strength when the long fiber parallel sheet is stretched as described above is Bg, the strength is expressed by the following formula. Strength [(g/m)/(g/m ² )] = B/0.1A (b) Measurement of elongation; Elongation means the elongation at the time of maximum strength in item (a) above. For example, if the length in the horizontal direction of the long fiber parallel sheet whose elongation is to be measured is Cm, and the length when gripping both ends and pulling to give maximum strength is Dm, then the elongation is is expressed by the following formula. Elongation (%) = D-C/C x 100 (c) Measurement of partial elongation; It means the elongation in the parts where the width direction of the long fiber parallel sheet is subdivided, and actually the above ( b) Measure the elongation of item Cut an arbitrary part of the near tassel to a width of 10 cm in the direction perpendicular to the fibers, fold it in four in the length direction to make 2.5 cm,
The elongation is the elongation at which the same strength as the maximum strength in item (a) above is obtained when this is gripped at both ends and pulled in the horizontal direction so that the width in the horizontal direction of any part is 2 cm. In this case, if the length in the horizontal direction is wider than 2 cm, it will not be possible to accurately capture the uniformity, while if the length is shorter than 2 cm, more stress will occur in the tearing direction. This makes it difficult to accurately measure elongation. In addition, in the measurement methods of sections (a), (b), and (c) above,
The pulling speed is 1000% of the length of both ends gripped per minute.
Let the length be . Furthermore, when cutting the sample for these measurements, it is desirable to do so carefully so as not to disturb the arrangement of the long fibers of the parallel sheet and the form of the sheet. In the present invention, a combination of crimp and adhesive application is used as a means for partially intertwining or joining long fiber parallel sheets arranged substantially in the vertical direction. The tensile strength (a) in the horizontal direction of the long fiber parallel sheet of the present invention is 1 to 40 (g/m)/(g/m ² )
range, preferably 4 to 30 (g/m)/(g/m)
m ² ). If this strength is less than 1, the partial entanglement or bonding is insufficient.
The tensile force in the horizontal direction is not transmitted to the whole, resulting in an uneven state, and partial breakage is likely to occur. On the other hand, even when the bonding strength is greater than 40, it is practically impossible to make the bonding forces completely equal, so slight differences in bonding force due to entanglement or bonding may cause
The fibers tend to form large bundles and spread out into blocks, and are not uniform. On the other hand, even if the strength is within the above range, the elongation (b) at that time is
Even if a parallel sheet with a width smaller than 400% is stretched, it is difficult to obtain a homogeneous stretched sheet. In addition, if the elongation (a) exceeds 2000%, the distance between the bonding points is extremely long, or a large number of bonding points are separated and the strength is maintained by the frictional resistance of the fibers and the bending stress of the fibers. There is also a lack of uniformity. The preferred elongation range is 600-1800%. Strength (a) and elongation (b) in long fiber parallel sheets
is within the range specified in the present invention, the partial elongation (c) of the sheet is preferably 70 to 130% of the elongation value of the sheet in any part of the sheet. If it is not in the range of 80 to 120%, more preferably 85 to 115%, it will not be uniformly spread and the desired spread sheet will not be obtained. In order to satisfy the conditions (a), (b) and (c), the long fibers of the long fiber parallel sheet must have a cross-sectional diameter of 3
It is necessary to have an average interlacing point spacing of ~300 times, preferably 5-100 times. The long fibers constituting the long fiber parallel sheet of the present invention have a single filament of 0.1 to 30 de, preferably 0.2 to 20 de.
It is desirable that it be within the range of . By using long fibers in such a range, it is possible to easily obtain a stretched long fiber sheet that has uniform drapability and is applicable to clothing applications. In the present invention, the number of crimps of the crimped long fibers constituting the long fiber parallel sheet is 10 per inch.
The number is advantageously 30, preferably 12 to 25, and it is desirable to heat-set the crimp beforehand, especially if heat is applied, for example during drying of the adhesive. If the number of crimps is less than 10, the degree of entanglement or bonding of the long fibers will be reduced, making it difficult to obtain a material with a desired spacing between bonding points. On the other hand, if the number of crimps is greater than 30, the long fibers will become entangled or have too many bonding points, making it difficult to maintain an appropriate spacing between the bonding points. When the long fiber parallel sheet of the present invention is bonded with an adhesive, the proportion of the adhesive used affects the uniformity, strength, drapability, etc. when it is spread. The preferable proportion of the adhesive used is in the range of 0.1 to 10% by weight based on the long fibers, especially in the range of 0.5 to 10%.
It is in the range of 5%. Adhesives that can be used in this case may be those that are normally used for bonding fibers, and preferred examples include the following. These may be used alone or in combination of two or more types. (i) Thermoplastic resins; For example, polyvinyl resins such as polyacrylic acid ester, polyvinyl alcohol, polyvinyl acetate, and polyvinyl chloride; polyolefin resins such as polyethylene and polypropylene; polyurethane resins, polyester resins, polyamide resins, rubber, etc.; ( ii) Thermosetting resins; for example, urea resins, melamine resins, phenolic resins, etc.; (iii) Natural or semi-synthetic glues; for example, starch, natural rubber, celluloses such as carboxymethyl cellulose, etc. These adhesives are, for example, water-soluble, It is used in various forms such as emulsion or latex, powder, and fiber. When selecting an adhesive, it is also necessary to pay attention to the initial tensile modulus of the adhesive.
This is because the initial tensile modulus, along with the amount of adhesive used, not only affects the spreading strength, but also changes the drape properties of the final product. The long fibers constituting the long fiber parallel sheet of the present invention may be formed from various polymers, but preferably polyesters such as polyethylene terephthalate and polyethylene terephthalate; polycapramide, polyhexamethylene adipamide, polyamides such as poly-m-phenylene isophthalamide; polyolefins such as polyethylene and polypropylene; polyvinyl alcohol,
Polyvinyl polymers such as polyvinyl chloride and polyacrylonitrile; other polyurethane, acetate, rayon, or polymers of two or more of these. In particular, among these polymers, polymers formed from polyethylene terephthalate, polybutylene terephthalate, polycapramide, poly-m-phenylene isophthalamide, polypropylene, polyacrylonitrile, or polymers (including copolymers) of two or more of these Preferably. The above-mentioned long fiber parallel sheet of the present invention can be stretched as it is or by laminating two or more sheets to form a long fiber stretched sheet, as described later, and furthermore, at least two or more long fiber stretched sheets obtained in this way can be stretched. By laminating them, a highly homogeneous nonwoven sheet suitable for clothing can be obtained. The long fiber parallel sheet suitable for such uses has a basis weight of 2 to 200 g/
m ² , particularly preferably from 5 to 150 g/m ² . The long fiber parallel sheet described above can be provided with a suitable activating substance to improve or impart coloring, electrical properties, chemical properties, physical properties, and other properties. The long fiber parallel sheet of the present invention is extended approximately perpendicularly to the arrangement direction of the long fibers (width direction) to form a long fiber extended sheet. The stretching ratio at that time is the elongation of the long fiber parallel sheet to be stretched.
In order to obtain a homogeneous sheet, it is necessary to increase the amount by 0.5 to 1.1 times, preferably about 0.7 to 1 times. If the spreading ratio is smaller than the above range, unspreaded parts will occur,
Therefore, it becomes difficult to obtain a homogeneous sheet, and on the other hand, if the upper limit of the above range is exceeded, the elongation considerably exceeds the elongation.
Entanglements and joints between the long fibers are greatly distorted, and cracks occur in the parallel sheets, making it impossible to obtain a homogeneous spread sheet. The long fiber parallel sheet may be stretched in the above range by any means that can be stretched uniformly in the width direction, such as a method using an arc-shaped roller or bar, a method of spreading while conveyed by a plurality of belts, a method using a pin tenter, etc. There are ways to use
The most preferred method is to spread the sheet while gripping both ends of the sheet by some means, since it is simple and allows a uniformly spread sheet to be obtained. When stretching a long fiber parallel sheet in the width direction, the parallel sheet generates a shrinking force in the longitudinal direction, so it is preferable that the speed at which the parallel sheet is fed is higher than the speed in the vertical direction of the part to be stretched. . If the physical properties of the spread sheet you are trying to obtain require strength only in the vertical direction, the feeding speed may be approximately the same as the speed in the vertical direction of the part to be spread, but in general, it is necessary to balance the vertical and horizontal directions. Since moderate strength is required, in this case, the feeding speed is preferably 1.2 to 3.0 times, preferably 1.3 to 2.5 times, the speed of the spreading portion. When this magnification is low, it is preferable to lower the spreading magnification. It is industrially advantageous to spread the long fiber parallel sheets by laminating two or more sheets, for example 2 to 30 sheets, especially 3 to 20 sheets, so that the fiber arrangement direction is substantially parallel, and it is also uniform. A product with good properties can also be obtained. The number of sheets to be laminated is appropriately selected depending on the properties of the long fiber parallel sheet, the desired physical properties of the long fiber extended sheet, and the like. Furthermore, when two or more sheets are laminated and spread, it is not necessarily necessary to use the same long fiber sheets. For example, as long as the long fiber sheet satisfies the above-mentioned requirements of the present invention, sheets formed from different polymers and sheets with different basis weights can be suitably laminated to form a long fiber sheet with extremely high quality. One of the features of the present invention is that a long fiber stretched sheet of desired quality can be easily obtained. When a spread sheet is obtained by laminating two or more sheets in this way, this is heated and/or pressure is applied.
Alternatively, it is also possible to at least partially join by using an adhesive. At that time, it may be laminated with a sheet material such as a fiber web or film made of a polymer having a melting point lower than that of the polymer forming the extended filament sheet. The long fiber stretched sheet obtained by the present invention is extremely homogeneous and has a highly strong network structure, so it can be used as such for various purposes. If they are laminated and optionally at least partially bonded to each other, a thick stretched laminate is obtained. In this case, commonly known hot press methods and adhesive methods can be employed. The long fiber stretched sheet of the present invention is characterized in that the structural fibers are composed of continuous long fibers, that the fibers are already entangled or bonded at the stage of parallel sheet formation, and that each fiber is formed into a network by stretching. It has a shape structure, has excellent strength, and also has excellent uniformity and drapability, so it can be used for clothing. Furthermore, by appropriately selecting the method of joining the spread sheet, it can be used as an industrial material, civil engineering material, and agricultural material. ,
It can be used for a wide range of purposes such as sanitary materials and household materials. As the long fibers used in the present invention, if there are filaments or tows that are already generally produced for textile products, they can be used, so there is no need to create new equipment. Therefore, compared to the spunpond method, etc., in which the spinning process is directly connected, this method requires much smaller equipment, and also has the advantage of being able to easily switch and manufacture a wide variety of products. The following examples are for illustrating the present invention, and are not intended to limit the present invention. Example 1 Single 6de long polyethylene terephthalate fibers were drawn approximately parallel to each other to give a total of 1.3 million De, stretched 4 times and crimped at 18 ke/inch.
After heat setting at a temperature of 180°C for 2 minutes, the fibers were opened continuously and expanded to a width of 1.5 m using an arc bar, and then ethyl acrylate/butyl acrylate =
An emulsion-type adhesive made by adding a small amount of emulsifier to a 50wt%/50wt% copolymer is impregnated over the entire surface so that the adhesion amount is 5wt%, and the temperature is 100%.
It was dried at ℃ to obtain a long fiber parallel sheet with a basis weight of 30 g/m ² . When this sheet was observed under a microscope, the diameter of the fibers was 7 microns, and the average entanglement point distance was about 70 microns, which was about 10 times the diameter. When the strength and elongation of this parallel sheet in the horizontal direction was measured by the method described in the text, a curve as shown in FIG. 1 was obtained. The maximum strength was 12.7 g/m/g/m ² and the elongation was 920%. When a similar test was carried out on adjacent parts divided into 30 locations in the width direction, the results were 12.7g/m/
All partial elongations when showing strength of g/ ^m2 are 800~
It was in the range of 1050%. This partial elongation was in the range of 87 to 114% with respect to the overall elongation of 920%, and met the characteristics aimed at by the present invention. Next, three of these parallel sheets were laminated and stretched in the width direction by a pin tenter to 950%, that is, 1.03 times the elongation of the parallel sheets, while being fed at an overfeed of 1.4 times. Heat press with a roller and add 15wt% of the above adhesive.
A long fiber extended sheet was obtained. Fabric weight 14g/m ²
This sheet was extremely uniform and had good drapability. Its characteristics are shown in Table-1. Example 2 Polypropylene was melted in an extruder, mixed with N ₂ gas, extruded through a slit die, cooled and taken off under a draft to obtain a fiber structure having numerous discontinuous cracks in the longitudinal direction. Ta. This sheet with a basis weight of 13.6 g/m ² and the long fiber parallel sheet obtained in Example 1 were combined into +++++
The layers were laminated so as to be positive, spread under the same conditions as in Example 1, and hot pressed at a surface temperature of 150°C. The obtained long-fiber stretched sheet with a basis weight of 19 g/ ^m2 has extremely uniform drape properties, has little difference in strength between vertical and horizontal directions, has almost no fluff, and can be heat-sealed at temperatures exceeding 160°C, the melting point of polypropylene. This made the connection extremely strong. Example 3 A composite fiber with polycaproamide as the core component and polystyrene as the sheath component, with a weight ratio of core/sheath = 70/30, was spun into a single yarn of 10 de, totaling 500,000 yen.
Arrange them approximately parallel to each other so that they are De, stretch them 3 times, and then add toluene and butyl acetate in a weight ratio of 1:1.
The polystyrene component is immersed in a solvent mixed with
After eluting 90 wt%, it was dried to obtain a parallel sheet with a basis weight of 27 g/m ² and an average interlace point distance of about 60 times the fiber diameter. Next, stack six of these parallel sheets,
While feeding at twice the overfeed, it was spread by 700% with a pin tenter, and then polyurethane/polyacrylonitrile butadiene copolymer = 80/
20wt% butyl acetate/dimethylformamide =
4/1wt% solution (concentration 20%), effective deposition amount 50wt
%, and then dried, with a basis weight of 61g/m ²
The fabric was bulky and had excellent drape properties, making it useful as a base fabric for clothing. Example 4 Using long fibers of poly-m-phenylene isophthalamide with a single yarn of 2 de, the fibers were drawn approximately parallel to each other to a total of 200,000 De, crimped at 12 strands/inch, and further Example 1 After the same process as above, the basis weight is 94.
A parallel sheet of g/m ² was obtained. Then this sheet 20
Laminated sheets, overfeed 1.8 times, spreading magnification 600
%, pressed with a roller with a surface temperature of 210°C, and then needle punched to obtain a bulky spread sheet with a basis weight of 490 g/m ² . This sheet was suitable as a filter used under high temperature conditions. Example 5 Single yarn 5de total 1,080,000De crimps 15 pieces/inch,
A brown parallel sheet with a basis weight of 22 g/m ² was obtained in the same manner as in Example 1 except that a brown pigment was mixed in the adhesive so that the solid content was 10 wt%.
Fifteen of these sheets were stacked and subjected to the same conditions as in Example 1 to obtain a brown spread sheet. This sheet with a basis weight of 51 g/m ² was uniform and strong, and was useful as an interior sheet or a reinforcing sheet for interior materials. Example 6 A stretched sheet with a basis weight of 23 g/m ² was obtained in the same manner as in Example 1 except that the stretching rate was 550%, that is, 0.6 times the elongation of 920%. The basis weight was uniform. Example 7 Single drawn filaments of polyacrylonitrile with a diameter of 1.7 de are drawn approximately parallel to each other to a total of 150,000 De, crimped at 20 strands/inch, and opened continuously to form an arc. It was expanded to a width of 1.5 m using a bar, applied with 5 wt % of the adhesive used in Example 1, and dried to obtain a parallel sheet with a basis weight of 18 g/m ² . Next, 10 of these sheets were stacked and spread at an overfeed of 1.8 times and a spreading rate of 1000%, and the surface temperature was 170.
Press the adhesive with a roller at ℃
It was applied with 15 wt%, dried, and then molded using a textured embossing roller with a surface temperature of 150°C. This sheet was flexible and could be used for clothing. Comparative Example 1 In Example 1, the stretching rate was 350%, that is, 0.38 times the elongation of 920%. A portion that had not yet been spread remained, resulting in uneven area weight. Comparative Example 2 In Example 1, the stretching rate was 1100%, that is, 1.20 times the elongation of 920%. Partial cracks occurred and it could not be spread uniformly. Comparative Example 3 Example 1 except that the crimp was 5 crimps/inch.
A parallel sheet was obtained in the same manner. When the strength and elongation in the transverse direction was measured, the variation in partial elongation was large, and it was found to be unsuitable as a parallel sheet of the present invention. Overfeed this sheet 2.0 times, spreading rate 770%
A spread sheet was obtained in the same manner as in Example 1 except for the following. This was so uneven that it could not be put to practical use. Comparative Example 4 A parallel sheet with a basis weight of 51 g/m ² was obtained in the same manner as in Example 1, except that the crimp was 40 crimps/inch and the adhesive was applied at 8 wt%. The average interlace point distance is approximately the fiber diameter
1.5 times, maximum strength 54.1g/m/g/m ² , elongation 330%
Therefore, it was unsuitable as a parallel sheet. A spread sheet was obtained in the same manner as in Example 1 except that the spreading rate was 330%. This sheet with a basis weight of 57 g/m ² lacked uniformity and was hard. Comparative Example 5 A parallel sheet with a basis weight of 43 g/m ² was obtained in the same manner as in Example 1, except that the crimp was 40 crimps/inch, and no adhesive was applied or dried. Although the interlacing point distance was extremely short, the bonding force between the fibers was extremely weak, so the elongation at the time of maximum strength was extremely large and varied widely, making it unsuitable for use as a parallel sheet. Two of these sheets were spread at a spreading rate of 2400% and an overfeed of 1.4 times, but they lacked uniformity. Comparative Example 6 The fabric weight was determined in the same manner as in Example 1 except that the crimp fixing temperature was 80°C and the adhesive drying temperature was 200°C.
A parallel sheet of 16 g/m ² was obtained. When observed under a microscope, the crimps were elongated during drying, and the average interlace point distance was about 450 times the fiber diameter. All examples are Example 1 except that the spreading rate is 1000%.
In the same manner as above, a spread sheet with a basis weight of g/m ² was prepared.
The fibers were separated into blocks and lacked uniformity. Comparative Example 7 A parallel sheet with a basis weight of 10 g/m ² was obtained in the same manner as in Example 1, except that 8 crimps/inch were applied and no adhesive was applied or dried. 20 sheets of this were laminated and stretched 3300% in the width direction with an overfeed of 1.4 times, but it was uneven. Comparative Example 8 When the parallel sheet of Example 1 was pressed through a pair of press rollers at 190°C, the elongation at the time of maximum strength decreased to 230%. The procedure was the same as in Example 1 except that the spreading rate was 230%, but it separated into blocks and was extremely lacking in uniformity. Comparative Example 9 The adhesive of Example 1 was emulsified by adding a small amount of emulsifier to a copolymer of ethyl acrylate/methyl methacrylate = 40wt%/60wt%, and the spreading rate was Everything was the same as in Example 1 except that 1300% was used. The spread sheet lacked uniformity. Comparative Example 10 Tows of drawn polyethylene terephthalate fibers with a single yarn of 1.5 de and a total weight of 40,000 De were aligned approximately parallel to each other, passed through a compressed air injection tube with a pressure of 50 kg/cm ² , and placed on a 300 mesh stainless steel wire mesh. A random web with a basis weight of 29 g/m ² was obtained by spraying. This was passed through a pair of press rollers at 200°C, and then 1.5 wt% of the adhesive of Example 1 was applied and dried to obtain a spunbond long fiber random sheet. The fibers were poorly dispersed and aggregated in blocks, lacking drape and uniformity. 【table】

[Brief explanation of the drawing]

The attached drawings show the relationship between the strength and elongation when the long fiber parallel sheet of the present invention is stretched in the horizontal direction, particularly in the case of the parallel sheet described in Example 1.

Claims (1)

[Claims] 1. Long fibers having 10 to 30 crimps per inch are substantially arranged in the vertical direction and are partially intertwined, and the average distance between the intertwined points of the fibers is equal to the fiber diameter. is within the range of 3 to 300 times, and the intertwined points are at least partially joined with an adhesive, and the strength in the horizontal direction of the sheet is 1 to 40 (g). /m)/(g/ ^m2 )
and the partial elongation of any part of the sheet when a load of the same value as the strength of the sheet is applied in the horizontal direction of the sheet is 70 to 130% of the elongation value of the sheet. After laminating two or more long-fiber parallel sheets within the range such that the fiber arrangement is substantially parallel, stretching in the horizontal direction to 0.5 to 1.1 times the elongation value of the sheet, After that,
1. A method for producing a long fiber extended sheet, which comprises joining long fibers at least partially to each other with an adhesive, if necessary. 2. The method for producing a long fiber extended sheet according to claim 1, wherein the long fibers are fibers of 0.1 to 30 de. 3. The extended filament according to claim 1, wherein the amount of the adhesive that at least partially joins the intertwined points of the parallel filament sheet is within the range of 0.1 to 10% by weight based on the parallel filament sheet. Method of manufacturing sheets.