JPH02289101A - Interlining - Google Patents

Abstract

PURPOSE:To provide an inexpensive interlining having excellent bulkiness, flexibility, uniform weave and elasticity and high productivity by mixing eccentric sheath-core type or side-by-side type polyester conjugate fibers having spiral crimps with thermally melt-adhering binder fibers in a specific ratio. CONSTITUTION:The aqueous dispersion of a fiber mixture is made up into wet paper and subjected to a heat treatment at 130-180 deg.C to provide the objective interlining having a bulk density of <=0.06g/cm<3> on the load of 2.5g/cm<2>, the fiber mixture comprising, for example, (A) >=30wt.% of eccentric sheath core type or side-by-side type polyester fiber having a free contraction rate of <=40 crimps/25mm on the dry heat treatment of 170 deg.C and having spiral crimps of >=40 turns/25mm after the dry heat treatment, (B) >=5wt.% of binder fibers capable of thermally melt-adhering at <=200 deg.C and (C), if necessary, one kind or more of natural fibers and synthetic fibers.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is directed to an interlining material having excellent bulkiness, flexibility, uniformity of formation, and elasticity, and a method for manufacturing paper using this interlining material at low cost and with high productivity. Relating to a method of manufacturing according to the method.

<Prior Art> Generally, interlining materials include fabrics, mainly knitted fabrics, and nonwoven fabrics such as nylon, polyester, or blends of these and other fibers.

Although interlining made from 1IAta material has high strength even if it is thin and is widely used, in order to make something thick or bulky, special structures such as 2 ′
It is similar to M-woven fabric, but since 2 to 3 pieces are used in layers, the weight increases, making it a heavy interlining material. In addition, making interlining from knitted fabrics involves weaving and weaving the yarn.
Furthermore, since it is dyed and processed, it is extremely difficult to produce products with different thicknesses and weights, and it becomes an expensive interlining material.

To solve this problem, the use of nonwoven fabrics as interlining materials has recently been rapidly increasing.

Generally used non-woven fabrics have a fiber length of about 20 to 60 m5, and are made from crimped short fibers such as recycled fibers or synthetic fibers. After forming a sheet-like web using a carding machine, the fibers are mixed with a needle punch or Entwined by water flow,
Bond with adhesive or heat-fusible binder**
Non-woven fabrics are produced by a so-called dry process, in which non-woven fabrics are mixed together and bonded together using heat. The nonwoven fabric sheet is highly flexible, bulky, and has high tear strength, so it has very good properties when used. However, productivity is extremely low compared to wet papermaking because it involves creating a web from cards, which poses economical problems.Furthermore, the resulting sheet generally has fibers arranged in the machine direction, so it is not strong in the width direction. In addition, since the sheet is made from a card to a non-woven fabric, the sheet texture is highly non-uniform, resulting in problems such as neps and unopened fiber defects.

In contrast to dry-processed non-woven fabrics, wet-processed non-woven fabrics are a paper-making method for producing so-called paper, and mainly produce Western paper and Japanese paper using cellulose pulp or bast fibers as the main raw materials. The manufacturing method is to produce fourdrinier from a mixed slurry of natural fibers such as pulp, recycled fibers, synthetic fibers, etc. and binder m fibers.
The fibers are drawn onto felt using a circular mesh, a minor scale, etc.
It is produced by drying this wet paper in a Yankee type or multi-tube dryer. The main properties of the paper obtained by this method are high tightness (bulk density), high tensile strength, excellent printability, and no fuzz.

Conversely, flexible tissue paper and toilet paper with low tension are also produced by reducing the thickness of the paper. However, in the papermaking method, the w&fibers must be two-dimensionally oriented in order to form sheets, making it impossible to obtain bulkiness (bulk density of 0.22 g/am' or less) that essentially has three-dimensionality. Not yet. The only method currently used to impart apparent bulkiness is to mechanically crepe or emboss the material to make it three-dimensional.
Although this method provides bulkiness and flexibility, this method lacks three-dimensionality inside the sheet and does not improve the original bulkiness and elasticity. However, the wet papermaking method uses inexpensive cellulose pulp, bast fibers, waste paper, etc.
It has high productivity and can produce paper of approximately 10 to 50 g/m' at a speed of several hundred to several thousand meters per minute, and in this respect it can be said to be an extremely advanced method.

The present inventors used a special polyester composite fiber and took advantage of the ability to mix it with all natural, recycled, and synthetic fibers, which is a major feature of the wet papermaking method, to originally create paper using water as a medium. When using the ntformation, the degree of freedom between the fibers becomes one member, eliminating the fatal drawback of highly tight sorting, which can only be achieved with paper-like sorting, and achieving high productivity and economy. The present invention was developed by paying attention to the possibility of obtaining a bulky and highly flexible interlining.

(Problems to be Solved by the Invention) As mentioned above, the wet paper making method, which has the feature of being able to mix all types of fibers, is a manufacturing method that is highly economical and productive. and a flexible interlining was not obtained. In this manufacturing method, it is possible to use crimped synthetic fibers to obtain bulkiness, but if fibers with a high number of crimps are used to obtain high bulkiness, entanglement of single fibers will occur. This results in balls of yarn, and uniform dispersion cannot be obtained. Even if dispersion were possible, the fibers would be arranged in a plane during papermaking, and the bulk would be crushed by hot pressure using a Yankee dryer or a multi-barrel dryer, so that sufficient bulkiness could not be obtained. Furthermore, if the fibers to be mixed are cellulose pulp, there is a problem that even more bulkiness cannot be obtained.

Furthermore, when forming a sheet, there are restrictions on the binder to be used, and it is necessary to select a binder that does not impair flexibility or bulk, does not cause the adhesive to peel off during washing, etc., and has good processability. Polyvinyl alcohol-based powder or fibrous binders are used in wet papermaking, but the binder resin is hard after drying, which poses problems in providing bulk and flexibility, and the adhesion deteriorates when washed. There's a problem.

(Means for Solving the Problems) That is, the present invention comprises 30% by weight or more of eccentric core-sheath type or side-by-side type polyester composite fibers whose crimping form is spiral crimping, and 5% by weight of heat-fusible binder fibers.
% by weight or more, the bulk density under load of 2.5 g/affl' is 0.06 g/cm' or less, and the free shrinkage rate in dry heat treatment at 170°C is 20. % or less, and the crimp form after the dry heat treatment is spiral crimp and has a latent crimp ability of 40/25 crimps or more Paper is made from an aqueous dispersion of a fiber mixture containing 30% by weight or more of fibers and 5% by weight or more of binder fibers that are heat-fused at 200°C or less, and 1.
This is a method for manufacturing an interlining, characterized by performing heat treatment at 30 to 180°C.

The polyester composite fiber used in the present invention is not particularly limited as long as it has a crimp ability that allows the bulk density of the final interlining to be 0.06 g/cry3. Preferably, the free shrinkage rate in dry heat treatment at 170°C is 20%, and the 40 care 25 m
It is a composite fiber that exhibits a crimp number of m or more. Such polyester composite fibers can be obtained, for example, by appropriately combining a copolymerized polyester and a homopolyester such as polyethylene terephthalate or polybutylene terephthalate and spinning them. Examples of copolymerized polyesters include aromatic dicarboxylic acids such as isophthalic acid and 5-metal sulfoisophthalic acid, aliphatic dicarboxylic acids such as adipic acid and sepacic acid, diethylene glycol, propylene glycol, l,4-butanol, pentaerythritol, etc. aliphatic polyhydric alcohol, 2.2°-bis(
A copolymerized polyester such as polyethylene terephthalate modified with an aromatic polyhydric alcohol such as 4-hydroxyethoquinophenyl)propane can be used. The copolymerization ratio varies depending on the type of compound to be copolymerized, so it cannot be generalized, or the modification amount must be such that the difference in melt viscosity between the polymer and the other polymer to be combined as a composite fiber is about 100 types and 500 voids. It is good if it is.

Furthermore, both the copolyester and the homopolyester may be modified with various monomers to the extent that the effects of the present invention are not impaired.

However, in order to obtain an interlining with particularly excellent performance, including crimp ability, in the present invention, it is preferably composed of two types of polyester polymers, of which polyester on the high heat shrinkage side is used. As the polymer component (A), a modified polyester whose main component consists of ethylene terephthalate units and which is copolymerized with isophthalic acid having a metal sulfonate group as a copolymer component and isophthalic acid as necessary, is used. As the polyester polymer component (B) on the low shrinkage side, a polyester consisting essentially of polyethylene terephthalate is used, and fibers obtained by spinning these two types of polyester polymers in an eccentric core-sheath type or side-by-side type are used. It is desirable that the free shrinkage rate in dry heat treatment at 170°C is 20% or less,
It is desired that the crimped form after the dry heat treatment has a potential crimping ability of 40 crimps/25 IIn or more in spiral crimping. Further, the composite fiber preferably has a fineness of 1 to 30 deniers and a fiber length of 3 to 2 hu+ before heat treatment. In the present invention, 30% by weight or more of the polyester synthetic fibers and 5% by weight or more of binder fibers that are heat-fused at 200°C or less are mixed to form an aqueous dispersion, and then wet-processed using fourdrinier, short-tone, or circular netting. Paper is made using the papermaking method, and after drying, it is heat-treated in the air at 130 to 180℃, and the paper is 2.5g/a.
The object is to obtain a facing material having a bulk density of 0.06 g/am' or less when loaded with m''.

Here, for the binder fiber, the heat fusion temperature is 200
Fibers made of a thermoplastic polymer alone at temperatures below ), there is no particular limitation, and it is preferable to use heat-fusible binder fibers having a fineness of 1 to 30 deniers and a fiber length of 3 to 20+aa+.

In the interlining of the present invention, if the bulk density at the time of a load of 2.5 g/cm' exceeds 0.06 g/cm', the interlining material has excellent softness and does not have a paper-like feel, which is the objective of the present invention. is not obtained.

In the polyester composite fiber having latent crimp ability used in the present invention, the polymer component (A) on the high heat shrinkage side preferably has a repeating main constituent unit consisting of ethylene terephthalate, and a metal sulfonate as a copolymer component. It is a modified polyester containing 1 to 6 mol % of isophthalic acid having groups and 0 to 10 mol % of isophthalic acid, preferably 4 to 8 mol %. Even without copolymerizing isophthalic acid, the polymerization reaction of polyester proceeds appropriately and it is possible to produce a polyester composite fiber having a latent crimp ability within the scope of the present invention, but in order to further increase the bulkiness of the interlining. It is preferable to copolymerize isophthalic acid. If the content of isophthalic acid exceeds 10 mol %, it becomes difficult to stably obtain an appropriate degree of polymerization, and crimp fastness may decrease.

Further, isophthalic acid having a metal sulfonate group to be copolymerized is used to maintain an appropriate melt viscosity and to realize the ability to develop latent crimp within the scope of the present invention. Examples of the isophthalic acid having a metal sulfonate group in the present invention include 5-sodium sulfoisophthalic acid, 5-potassium sulfoisophthalic acid, and 5-lithium sulfoisophthalic acid. An ester-forming compound having a metal sulfonate group such as these ester-forming derivatives is added in a range of 1 to 6 mol% when polyethylene terephthalate is polymerized, and the above-mentioned isophthalic acid is added as necessary and copolymerized to form a polymer. (^) is obtained. In addition to this, a polyethylene terephthalate polymer copolymerized with a high proportion of isophthalic acid containing a metal sulfonate group is prepared in advance, and if necessary, a polyethylene terephthalate polymer copolymerized with a high proportion of isophthalic acid is also prepared. It can be obtained by a masterbatch method, etc., in which these are mixed with polyethylene terephthalate in a copolymerization ratio of 1 to 6 mol % and 0 to 10 mol %, respectively.

If the copolymerization ratio of isophthalic acid having a metal sulfonate group is less than 1 mol %, the development of shrinkage stress during heat treatment is weak and crimp development is poor. If it exceeds 6 mol%, the melt viscosity of the polymer becomes too high, making it difficult to stably obtain a polymer with an appropriate degree of polymerization in the crimping reaction, and increasing crystallinity during spinning, causing changes over time. This results in a decrease in drawability, making it impossible to obtain composite fibers with sufficient latent crimpability. Preferably 1 to 5 mol%, more preferably 2
~4 mol%. Furthermore, copolymer components other than those mentioned above may be introduced into the polymer (A) as long as the high heat shrinkability is not significantly impaired. Also, the intrinsic viscosity of the polymer (A) is 0
．． 45-0.66 is preferable, especially 0.45-0.50
is preferred.

Polyester consisting essentially of polyethylene terephthalate can be used as the polymer component (B) on the low heat shrinkage side. Of course, the polymer (B) may be copolymerized as long as the crimping effect of the polymer (A) is not significantly reduced. Further, the intrinsic viscosity of the polymer (B) is 0.60 to
A degree of polymerization of 0.70 is preferred.

If necessary, inorganic substances such as metal oxides such as titanium oxide, zirconium oxide, silicon oxide, and alumina, flame retardants, antibacterial agents, deodorants, fragrances, and hydrophilic agents such as sodium dodesolbenzenesulfonate may be mixed. Furthermore, a polymer may be added to the polymers (A) and (B) to the extent that the crimpability of the fibers is not significantly impaired.

The spinnerets used are round, triangular, medium, figure 8, and T.
Composite type caps having flower shapes such as molds are considered, but are of course not limited to these, and are not particularly limited to composite shapes, but in general, side-by-side type caps have more crimp-producing force than eccentric core-sheath types. It is preferable because it is excellent.

The latent crimpable conjugate fibers used in the present invention are as described above (^), (B
) in the range of 270 to 290°C using the above-mentioned die, and the composite ratio (^): (B) = 40
It is particularly preferable to use eccentric core-sheath type or side-by-side type conjugate fiber in the range of 6060-40, preferably side-by-side type as described above. The melt viscosity of the 2N polymer component during spinning is preferably (A)>(B), and the melt viscosity difference at 285°C is in the range of 100 to 1,500 voids, preferably 300 to 1,000 voids. It is preferable to obtain a composite spun fiber having excellent latent crimp ability. As the composite ratio deviates from 50:50, the two-ing phenomenon becomes more likely to occur at the nozzle discharge part (^
): (B)=45-55: The range of 55-45 is most preferable.

Next, in order to impart bulkiness, flexibility, stretchability, and elongation recovery to the interlining, it is important to heat-treat the latent crimpable composite fibers to develop spiral crimp. Furthermore, it is important that the number of spiral crimps and the shape (curvature) of the crimps at that time are sharp. Specifically, by dry heat treatment at I 70 °C, the number of crimps is 40/25 nm or more. It is preferable to express. If the number of crimps is 40≠, the softness and elasticity will be significantly reduced, resulting in a highly dense interlining. In addition, the shrinkage rate during heat treatment depends on the texture of the interlining,
Considering the important relationship between bulkiness and elasticity, 170°C is selected as a representative temperature that satisfies the preset temperature of 160 to 180°C, which is the in-shell processing condition, and the final dry heat treatment temperature of 130 to 180°C for interlining. If the shrinkage rate when the fiber is subjected to free shrink heat treatment at 170° C. is 20% or less, these items are fully satisfied. If the shrinkage rate exceeds 20%, the interlining will have a hard feel, have low crimp properties, especially low crimp fastness, and have low durability.

A crimpable composite fiber having such latent crimpability and heat shrinkability is characterized by a difference in melt viscosity between polymer (A) on the high heat shrinkage side and polymer CB) on the low shrinkage side, and It can be obtained by appropriately selecting the copolymerization ratio in A), the composite ratio of (^) and (B), and the stretching conditions and tension heat treatment conditions in the post-spinning stretching step. The stretching conditions are such that the latent crimp ability can be maximized by stretching at 60 to 75% of the maximum stretching ratio of the fiber thrust after spinning, and in this state, tension heat treatment is performed in the range of 130 to 180°C. By doing so, it is possible to maintain high crystallinity and develop a high potential crimp force.

In addition, latent crimpable composite fibers are uncrimped fibers e (
Although it is normal to use t, in order to further improve crimpability, mechanical crimping is performed using a push-type crimper, which is a common method, to the extent that no undispersion occurs during water dispersion, and the number of crimps is 3 or more.
It is also possible to use raw cotton to which 20/251 has been added. If the number of wires exceeds 20/251, it is not preferable because the heater or pulper will not sufficiently disintegrate the material. The fiber density of the latent crimpable polyester composite fiber is preferably 1 to 30 deniers, more preferably 2 to 6 deniers. If it is less than 1 denier, the ability to develop spiral crimp is good, but the ability to develop crimp is weak, and it is difficult to obtain bulkiness. Further, in a region exceeding 30 denier, the interlining becomes stiff and lacks flexibility, and furthermore, the interlining becomes weak, which is not preferable. The fiber length is preferably 3 to 20 as, particularly preferably 4 to 10 mm, because it is effective for uniform dispersion in water and crimping for wet paper making.

If the water dispersibility is less than 3 m, the fibers of the rays become short, which is not preferable because fluff and paper dust are generated. If it exceeds 20 mm, the fibers have poor dispersibility and become block-like, making it difficult to obtain a uniform interlining.

In addition, if the content of the latent crimpable polyester composite fiber used in the present invention in the interlining is less than 30% by weight, each fiber may be crimped, but it will not be mixed with the heat-fusible binder fiber or other fibers. Even if crimp development is achieved through heat treatment, stress development that overcomes the constraints of other added fibers cannot be achieved. For this purpose, the content is required to be 30% by weight or more, preferably 50% by weight or more.

Additionally, a surface treatment oil may be added during the manufacturing process to improve dispersibility in water.

In order to effectively develop latent crimpability, a heat treatment method that does not apply force in the papermaking direction or thickness direction of the interlining is preferred. For example, 140 to 180 on a sheet on endless wire mesh.
Is there a way to blow hot air at ℃ or pass it through a through dryer?
, not captured by the device.

The heat-fusible binder fibers include latent crimpable polyester fibers, natural fibers, recycled fibers,
When mixed with synthetic fibers, the dryer part and latent crimpable polyester composite fibers are heat-treated to effectively bond each fiber in the step of causing crimp development.

That is, they may be heat-sealed in a dryer part at 90 to 130°C, or they may be joined in a pseudo manner. Another 130
It is preferable that the fibers are bonded together by heat fusion at the same time as crimping occurs during heat treatment at ~180°C. From these points, we have further developed the heat-fusibility and latent crimp polyester properties.
It is a necessary condition that the heat fusion temperature is 200°C or less based on the heat treatment temperature of the fiber.

Temperatures exceeding 200° C. are not preferable because the performance of the latent crimpable polyester fiber will deteriorate if heat fused.

The heat-fusible binder is IJk made of thermoplastic polymer.
If it is not Q (i), it is not preferable because flexibility cannot be obtained. Preferred examples of B include polyolefin fibers such as polyethylene and polypropylene, or fibers made of polyester or polyamide whose melting point or softening point has been lowered by copolymerization. Naturally, a core-sheath type composite fiber covered with the polymer can also be used. In this case, as the core component, an unmodified polyester, polypropylene, polyamide, or other polymer is used.

The heat-fusible binder fiber used preferably has a denier of 1 to 30. If it is less than 1 denier, the dispersibility in water will be poor, and if it exceeds 30 denier, the binder effect will decrease and the texture of the interlining will deteriorate. It is not desirable because it will worsen the condition. Regarding the winding 11ff, it is preferable to use an uncrimped one in order to obtain water dispersibility, but in order to improve the bulk during heat treatment, crimping of 20/251 or less is within the range that does not impair water dispersibility. may be given. 20 pieces/2511
If the crimp exceeds 1111, the yarn will become tangled during water dispersion, which is not preferable.

The content of the heat-fusible binder fiber is required to be 5% by weight or more, preferably 10 to 40% by weight.

If it is less than 5% by weight, the latent I will improve the paper strength and elasticity recovery properties when mixed with shrinkable polyester composite fibers and natural fibers, recycled fibers, and synthetic fibers as necessary, as well as the prevention of fuzz appearing on the interlining surface. It has no effect on

Other fibers that can be used in the present invention include, for example, recycled fibers. Recycled fibers are typified by rayon obtained from viscose, but recycled fibers have superior bulk to conventionally produced rayon paper, and are softer due to rayon's hydrophilicity and papermaking properties. A stretchable interlining with good elasticity and texture can be obtained.

Synthetic fibers are used as added fibers. Synthetic fibers such as polyester, polyolefin, polyamide, polyacrylonitrile, and polyvinyl chloride provide flexibility and bulk, and improve the feel. In addition, polyvinyl alcohol-based synthetic IA fibers can be used to strengthen the stiffness of the interlining, to have antifouling properties, and to improve hydrophilicity.

Furthermore, various types of cellulose can be considered as natural fibers, but at present they are not often used as interlining materials.

Regenerated fibers and synthetic fibers preferably have a fineness of 082 to 30 deniers. If it is less than 0.02 denier, dispersibility in water is poor and pilling is likely to occur. On the other hand, if it exceeds 30 denier, the resulting interlining will be stiff and hard, resulting in insufficient flexibility. Considering the dispersibility in water, it is preferable that the number of crimps of the fiber is less than 1, but in order to provide bulkiness, flexibility, and stretchability within a range that does not impair dispersibility,
A crimp of 20/25 or less may be provided. Roll! If the number of fibers exceeds 20/25, the dispersibility of the fibers in water becomes poor and the fibers become beaded, which is not preferable. The fiber length is preferably 2 to 20 mm, more preferably 3 to 10 mm. If it is less than 2, the dispersibility in water is good, but the fibers are short and fluff or paper dust is generated. On the other hand, if the length exceeds 20 m, the dispersibility in water becomes poor, and it becomes fluffy or string-like, making it difficult to obtain a uniform texture and texture. The cross-sectional shape of such recycled fibers and synthetic fibers is not limited to circular shapes, but may include flat shapes,
It may have a different shape such as a U-shape, a Y-shape, a T-shape, a star shape, or a triangular shape, and may further have a hollow portion in its cross section. Further, the fiber form may be fibrillar.

In the present invention, the above-mentioned natural fibers, regenerated fibers and synthetic #! One or more types of fibers selected from the group consisting of fibers can be used depending on the purpose.

As described above, the fiber raw materials used for the interlining of the present invention include polyester composite fibers having latent crimp ability as defined in the present invention, heat-fusible binder fibers, and other natural fibers added as necessary. The essential condition is that it be composed of fibers selected from the group consisting of recycled fibers and synthetic fibers.

The method for manufacturing the interlining of the present invention includes 30% by weight or more of polyester composite fibers having latent crimp ability, 5% by weight or more of heat-fusible binder fibers, and, if necessary, natural fibers, recycled fibers such as rayon, etc. A fiber mixture consisting of one or two or more types of fibers selected from the group consisting of synthetic fibers and synthetic fibers from the same pond is added with water to make a slurry of 1 to 10% by weight, and is disintegrated with a beater or pulper to create a homogeneous slurry. Create a dispersion in water.

Further, the mixture is diluted to a 0.5 to 5% aqueous dispersion using a CHEST, and stirred to obtain a uniformly dispersed slurry of fibers in water, which is used as a stock solution for papermaking. The slurry is transferred to a round screen or inclined wire long screen or short screen via a vibrating screen or a dust removal device as necessary, and while being divided with circulating white water, the slurry concentration (pulp concentration in the slurry) is adjusted to 0.02 to 1% by weight using a wire wire. Raise it to the top. The papermaking process may be performed using a circular mesh tank or multiple tanks. Furthermore, paper may be made using a combination of a circular screen and a fourdrinier or a short screen. The wet paper that has been papered onto the felt is vacuum dehydrated to remove excess water before it is transferred to a dryer. The type of dryer may be a Yankee type or a multi-tube type. Preferably, the wet paper on a rotating wire gauze is dried with hot air and heated to perform drying and heat treatment all at once to develop crimp. In addition, a Yankee method or a multi-tube method may be used, such as drying the wet paper at a drying temperature of 90 to 130°C, winding it up, and developing crimp in a heat treatment process, or in the case of a continuous process. Alternatively, after the drying process, a heat treatment process may be used to develop crimp. The heat treatment process is 130
A hot air method in which a temperature of 180 DEG C. is required and the hot air penetrates the paper layer is preferable, but a heat radiation method or a hot roll or hot plate contact method may also be used.

In order to obtain desirable bulkiness and flexibility, it is preferable to avoid applying tension in the paper making direction, width direction, and thickness direction as much as possible, and usually the paper is subjected to tension sufficient to move the paper. The interlining that has been crimped through the heat treatment process is usually spaced at regular intervals in order to improve its surface smoothness and reduce fluff.
It is passed through a heated roll at 0 to 200°C. It may also be patterned or embossed to improve strength. The interlining is cooled and wound under sufficient tension to allow it to be wound.

Specific examples of these will be explained below using Examples and Comparative Examples. In Examples and Comparative Examples, % is a value based on weight.

Example 1 (Manufacturing example of latent crimpable polyester composite fiber) Copolymerization of terephthalic acid as the main nocarboxylic acid component as the polymer component (A), 5 mol% of isophthalic acid, and 2.5 mol% of 5-sodium sulfoisophthalic acid. Intrinsic viscosity 0.45.
A modified polyester with a melt viscosity of 1.900 voids at 285°C was used, and the polymer component (B) had an intrinsic viscosity of 0.6 consisting essentially of ethylene terephthalate units.
Using polyester with a melt viscosity of 1.100 voids at 0.285°C, it was made into a side-by-side type with a composite ratio of 50:50 at 285°C from a round cross-section spinneret hole by a composite melt spinning device, with a discharge rate of 345 g/sin and 1150 a/s.
The undrawn yarn was wound at a speed of 2,700 mm to obtain an undrawn yarn with a cable denier of 2,700. After converging these undrawn yarns, the drawing ratio is 2.
, 5 times, stretched at a stretching temperature of 70°C, and stretched at a tension heat treatment temperature of 14°C.
Heat treatment was performed at 5° C. to obtain a straight latent crimp l&cone with a single fiber fineness of 2.5 denier.

The free shrinkage rate of this fiber after dry heat treatment at 170°C is 7.
5%, and the number of crimps was 60/25. The latent crimpable fibers were cut into fiber lengths of 5 mm and used as raw materials for papermaking.

Examples 2 to 7 and Comparative Examples 1 to 4 After weighing the latent crimpable polyester fibers obtained in Example 1, heat-fusible binder fibers, various polyester fibers, and rayon in the formulation shown in Table 1, they were simultaneously subjected to TAPPI bleaching. The mixture was put into a semi-female disintegrator at a concentration of 2 g IQ, and disintegrated for 300 counts to obtain a water-dispersed slurry. Furthermore, TAPP
Paper was made using a standard square paper machine to a target weight of 40 g/11". After drying the wet paper at 70°C for 1 minute,
A heat treatment was performed for 4 minutes on a wire mesh in an air dryer at 0° C. to obtain a bulky paper for interlining that developed crimp.

The heat-fusion binder fiber used is a composite fiber whose sheath part is a modified polyester that fuses at 130°C and whose core part is a normal polyester fiber [Kuraray Products Soffit@
N-720, fiber 2 denier, fiber length 5 mm]. The polyester fibers used are as follows.

EPO43x5 0.4 5 circular 0EP13
3x5 1.3 5 〃
0EPC133x5 1.3 5
〃18EPTC203x5 2. Q5
T type 18 rayon is made by Yamatobo (II), SD
(Semidull) 1.5 denier, fiber length 5cm, and non-crimped material was used.

In the obtained bulky paper for interlining, the latent crimpable polyester composite fiber had spiral crimp.

The following margin examples 2 to 7 have the characteristics of bulkiness and flexibility of the present invention. Comparative Examples 1, 2, and 4 have a small amount of heat-fusion binder fibers, and the base paper strength is low, making it difficult to handle.Although the paper after dry heat treatment at 170°C does develop crimp, the paper strength is low, making it unusable. There wasn't.

Next, the various bulky papers obtained here were cut and used as interlining material for ready-made clothes.The interlining material of the present invention has good elasticity and can form a natural silhouette. Unlike the interlining made of unlined fabric, it had a bulky and fluffy feel even without crepe processing.

Example 8 Potential P obtained in Example 1! Paper was made in the same manner as in Example 2 using a blend of 40% shrinkable polyester fiber, 20% heat-fusible binder fiber, and 43x54G% EPO manufactured by Kuraray Co., Ltd., a polyester fiber. However, the heat-fusible binder fiber is manufactured by Chisso Corporation (EA-Chop).

A composite fiber having a sheath component of polyethylene and a core component of polypropylene with a fiber length of 3 deniers (5 m) was used. As a result, the basis weight was 41. Og/2 servings, thickness 0.224a
m (according to JIS P 811B), bulk density 0
．． HIOg/cr+3 (J I S P 8118
), 2.5g/m” thickness at load 0.821■
A paper with a bulk density of 0.050 g/cs+' was obtained.

The dry and wet tensile strength is 0.04 and 0.0 respectively for a 15mm width.
4 kg, and the elongation was 25.3.235%, respectively.

It had a bending resistance of 32 mm and was extremely flexible. Next, we tried using the paper obtained here as an interlining for sportswear, and found that it was comfortable to wear due to its excellent elasticity, and it also had a very flexible texture. It was in good condition.

The method for measuring each characteristic value in the present invention is as follows.

(1) Intrinsic viscosity: Measured at 30°C in a mixed solution of equal weight of phenol and tetrachloroethane.

(2) Fineness: JIS L type 015-7-5-
Measured by IA method.

(3) Number of crimp, measured by JISL-InI3-7 type 2 method.

(4) Free shrinkage rate: JIS L type 015-7
Measured according to Method 5, treated in an atmosphere of 170°C for 30 minutes and applied a load of 300a+g per denier.

(5) Measurement of interlining physical properties Tsubo scratch ・JrSP8124 Bulk density 4 sheets of two papers (interlining) stacked, 2.5 g/cII
A plastic plate was placed against the plate, the thickness was measured with a micrometer, and the thickness was determined from the average thickness per plate. In addition, as a method other than this, JIS P811g
Measurements were also made by the method of measuring thickness and bulk density.

Strength and breaking length: JIS P8113 bending strength -
Cantilever method (JISL 1079 (6) texture: sensory evaluation as an interlining material was performed as follows.

◎Feel like rabbit fur (slimy and soft) O (soft feel) ΔFeel like cloth (rough) X Feel like paper (crunchy) (Effects of the invention) In the present invention, a specific latent crimpable polyester composite fiber, a heat-fusible binder w&fiber, and other natural fibers, recycled fibers, and synthetic fibers as necessary are mixed and heat-treated, thereby replacing conventional wet papermaking equipment. By using this method, a bulky, flexible interlining with uniform quality can be obtained.

Patent applicant RiRashi Co., Ltd.

Claims (1)

[Scope of Claims] 1) Contains 30% by weight or more of eccentric core-sheath type or side-by-side type polyester composite fibers whose crimping form is spiral crimping, and 5% by weight or more of heat-fusible binder fibers, And bulk density at 2.5g/cm^2 load is 0.
An interlining material characterized by having a weight of 0.6 g/cm^3 or less. 2) Contains one or more types of fibers selected from the group consisting of natural fibers, recycled fibers, polyester-based, polyamide-based, polyacrylonitrile-based, polyolefin-based, polyvinyl alcohol-based, polyvinyl chloride-based, and other synthetic fibers. 2. The interlining material according to claim 1. 3) Free shrinkage rate in dry heat treatment at 170°C is 20% or less, and the crimp form after the dry heat treatment is spiral crimp, with potential crimp ability to express crimps with a number of crimp of 40 crimps/25 mm or more. A wet paper is made from an aqueous dispersion of a fiber mixture containing 30% by weight or more of an eccentric core-sheath type or side-by-side type polyester composite fiber having a temperature of 130~ A method for manufacturing an interlining, characterized by performing heat treatment at 180°C.