WO2024048250A1

WO2024048250A1 - Pile fabric and manufacturing method therefor

Info

Publication number: WO2024048250A1
Application number: PCT/JP2023/029296
Authority: WO
Inventors: 大関達郎; 徳本裕幸; 平井悠佑
Original assignee: 株式会社カネカ
Priority date: 2022-08-29
Filing date: 2023-08-10
Publication date: 2024-03-07

Abstract

One or more embodiments of the present invention pertain to a pile fabric comprising: a base structure; and pile fibers that tangle with base threads constituting the base structure and that stand up on the surface of the base structure. The pile fibers include poly(3-hydroxyalkanoate)-based fibers, and the base thread includes fibers having a higher softening point than the poly(3-hydroxyalkanoate)-based fibers. Of the pile fibers tangling with the base thread, at least some of the poly(3-hydroxyalkanoate)-based fibers that are present on the back side of the base thread are fused. The dry heat shrinkage rate of the pile fabric at 140°C is 15.0% to 40.0%. The bending stiffness of the base structure is 1.00 × 10^-4 N·m²/m or less.

Description

Pile fabric and its manufacturing method

The present invention relates to a biodegradable pile fabric and a method for producing the same.

Synthetic fibers made of synthetic resins such as polyethylene terephthalate have been widely used as pile fibers. In recent years, from the viewpoint of environmental protection, biodegradable resins that decompose in the natural environment have been used. For example, Patent Document 1 describes a biodegradable carpet in which piles are made of biodegradable fibers made of a biodegradable polymer whose main component is an aliphatic polyester such as polylactic acid. Further, Patent Document 2 describes a pile fabric in which the pile yarns are made of filament yarns containing aliphatic polyester fibers containing L-lactic acid and/or R-lactic acid as a main component.
On the other hand, in the case of pile fabrics, backing treatment is usually used to prevent shedding. Further, Patent Document 3 describes that in a pile fabric using acrylic fibers, hair loss is prevented by thermocompression bonding the pile fabric from the back side.

Japanese Patent Application Publication No. 2002-248047 JP2002-004151A International Publication No. 2011-055455

However, the polylactic acid used in the pile fabrics described in

Patent Documents

1 and 2 does not have marine degradability, and further improvements are required from the viewpoint of environmental protection.
Furthermore, when backing treatment is used to prevent shedding, the pile fibers in the pile portion may shrink or fuse, resulting in a hard and rough texture. Further, when a pile fabric is thermocompression bonded from the back side as in Patent Document 3, the base structure of the pile fabric becomes hard, and the pile fabric may become hard.

In order to solve the above-mentioned conventional problems, the present invention provides a pile fabric that is ocean-degradable, has a good feel in the pile portion, has excellent flexibility, and suppresses shedding, and a method for producing the same.

One or more embodiments of the present invention are pile fabrics that include a ground weave and pile fibers that are entwined with ground yarns constituting the ground weave and are raised on the surface of the ground weave, the pile fibers comprising poly( 3-hydroxyalkanoate)-based fibers, the ground yarn includes fibers having a higher softening point than the poly(3-hydroxyalkanoate)-based fibers, and among the pile fibers entwined with the ground yarn, the ground yarn At least a portion of the poly(3-hydroxyalkanoate) fibers present on the back side of the threads are fused, and when the pile fabric is heat-treated for 15 minutes in a dry heat atmosphere at 140°C with no load, the difference between before and after heat treatment. The rate of change in the length of the pile fibers is 15.0 to 40.0%, and the bending stiffness of the base structure of the pile fabric is 1.00 × 10 ^-4 N m ² /m or less. Regarding the characteristic pile fabric.

One or more embodiments of the present invention include a step of manufacturing a pile fabric including a ground texture and pile fibers that are entwined with ground yarns constituting the ground texture and are raised on the surface of the ground texture, and The pile fibers include a step of thermocompression bonding from the side, the pile fibers include poly(3-hydroxyalkanoate)-based fibers, and the ground yarn has a higher softening point than the poly(3-hydroxyalkanoate)-based fibers. containing fibers, and the temperature conditions during the thermocompression bonding treatment are (1) above the softening point of the poly(3-hydroxyalkanoate)-based fibers and below the melting point of the poly(3-hydroxyalkanoate)-based fibers +10°C; and (2) if the softening point is lower than the softening point of the fiber, which is higher than the poly(3-hydroxyalkanoate) fiber in the base yarn, and the polishing step is not included, or if the polishing step is included, the polishing is , relates to a method for producing a pile fabric carried out at a temperature higher than the glass transition temperature of the poly(3-hydroxyalkanoate) fiber and lower than the softening point of the poly(3-hydroxyalkanoate) fiber -40°C.

INDUSTRIAL APPLICABILITY The present invention can provide a pile fabric that is marine degradable, has a good texture in the pile portion, has excellent flexibility, and has suppressed shedding.
According to the manufacturing method of the present invention, it is possible to suitably obtain a pile fabric that is marine degradable, has a good texture in the pile portion, has excellent flexibility, and has suppressed shedding.

It is a schematic explanatory view of one example of pile fabric. FIG. 2 is a manufacturing process diagram schematically showing a process of thermocompression bonding a pile fabric from the back side at a predetermined temperature. FIG. 2 is a schematic cross-sectional view illustrating a method for evaluating the flexibility of pile fabric. FIG. 2 is a schematic cross-sectional view illustrating a method for evaluating the flexibility of pile fabric. This is a photograph showing the surface of the pile portion of an example of pile fabric in which the ends of the hair are not fused. This is a photograph showing the surface of the pile portion of an example of a pile fabric in which the ends of the hair are fused. This is a schematic explanation of a method for measuring the length of pile fibers.

The present inventors have made extensive studies in order to solve the above problems. As a result, in pile fabrics that include a ground weave and pile fibers that are entwined with the ground yarns constituting the ground weave and are raised on the surface of the ground weave, (1) the pile fibers are poly(3-hydroxyalkanoate) fibers (hereinafter referred to as (2) using ground yarn containing fibers with a higher softening point than poly(3-hydroxyalkanoate)-based fibers, and creating piles entwined with the ground yarn; Among the fibers, at least a part of the poly(3-hydroxyalkanoate) fibers present on the back side of the base yarn is fused, and (3) the pile fibers in the pile fabric are made to have a predetermined dry heat shrinkage rate of 140°C. (4) By setting the bending rigidity of the ground structure in the pile fabric within a predetermined range, the pile fabric is made to have ocean degradability, and the texture of the pile part and the flexibility of the ground structure are improved. We have found that it can increase hair loss and suppress hair loss.

Although poly(3-hydroxyalkanoate) (hereinafter also simply referred to as "P3HA") has marine degradability, it has low heat resistance and shrinks significantly at a temperature of about 100°C. On the other hand, in the case of pile fabric, in order to prevent the pile fibers from falling out (shedding), backing treatment is performed, that is, adhesive is applied to the back side of the pile fabric and heated to a temperature of 100°C or higher (for example, 130°C) using a tenter. , the adhesive is dried and solidified, but when P3HA fibers are used as pile fibers, the P3HA fibers shrink greatly due to heat during the tenter process, resulting in pile fabrics that are hard to the touch and have a rough texture. . The present inventors examined the pile fabric from the back side of the ground structure without performing backing treatment. (2) The melting point of the base yarn is +10°C or lower, and (2) the base yarn is lower than the softening point of the fiber whose softening point is higher than that of the poly(3-hydroxyalkanoate) fiber. Among the pile fibers entangled in the fabric, at least a portion of the P3HA fibers present on the back side of the ground yarn are fused, and the P3HA fibers that stand on the surface of the ground texture are not fused, thereby suppressing hair loss. It has been found that the soft feel of the pile part can be maintained and the flexibility of the ground structure can also be maintained well. Further, when producing a pile fabric, polishing may not be included, but if a polishing step is included, the soft texture of the pile portion can be maintained by performing the polishing under specific temperature conditions.

In this specification, when a numerical range is indicated by "~", the numerical range includes both end values (upper limit and lower limit). For example, the numerical range "X to Y" includes both extreme values of X and Y. Moreover, in this specification, when multiple numerical ranges are described, numerical ranges that are appropriately combined with the upper and lower limits of different numerical ranges are included.

In this specification, biodegradability refers to properties that can be differentiated to the molecular level through the action of microorganisms and eventually become water and carbon dioxide, and marine degradability refers to properties that can be differentiated to the molecular level by the action of microorganisms in the ocean, It means the property of being differentiated down to the molecular level and eventually becoming water and carbon dioxide. Poly(3-hydroxyalkanoate) is widely used as a biodegradable bioplastic with marine degradability. By using P3HA-based fibers as the pile fibers, excellent ocean degradability can be imparted to the pile fabric.

In this specification, the biodegradability of pile fabrics varies depending on aerobic or anaerobic conditions, aqueous or solid phase systems, microbial groups, temperature, etc. 2, ISO14853, ISO15985, etc. Furthermore, biodegradability by microorganisms in seawater may be evaluated using the BOD (Biochemical Oxygen Demand) test method, which evaluates the amount of oxygen consumed.

(pile fiber)
In one or more embodiments of the invention, the pile fibers include P3HA-based fibers. From the viewpoint of marine degradability, when the total amount of pile fibers is 100% by weight, it is preferable to contain P3HA fibers in an amount of 80% by weight or more, more preferably 90% by weight or more, and even more preferably 95% by weight or more. Preferably, it is particularly preferably composed of 100% by weight. The pile fibers can contain other fibers, if necessary, within a range that does not impede the effects of the present invention. As other fibers, biodegradable fibers are preferred, and synthetic fibers containing aliphatic polyesters other than P3HA, natural fibers, regenerated fibers, and the like can be used. Examples of aliphatic polyesters other than P3HA include polylactic acid, polycaprolactone, polybutylene adipate terephthalate, polybutylene succinate adipate, and polybutylene succinate. Examples of natural fibers include natural cellulose fibers and natural animal fibers. Examples of natural cellulose fibers include cotton fibers, kapok fibers, flax fibers, hemp fibers, ramie fibers, jute fibers, Manila hemp fibers, and kenaf fibers. Examples of natural animal fibers include wool fibers, mohair fibers, cashmere fibers, camel fibers, alpaca fibers, and angora fibers. Examples of regenerated fibers include regenerated cellulose fibers such as rayon, regenerated protein fibers such as regenerated collagen fibers, and the like.

In one or more embodiments of the present invention, "P3HA-based fiber" means a fiber containing 80% by weight or more of P3HA, preferably 85% by weight or more, more preferably 90% by weight or more, 95% by weight or more. It is more preferable that the content is at least % by weight. In one or more embodiments of the invention, the P3HA-based fibers may optionally be comprised of 100% by weight P3HA.

For P3HA, a resin having a 3-hydroxyalkanoate repeating unit can be used, and specifically, a resin having a 3-hydroxyalkanoate repeating unit represented by the following general formula (1) can be used.

However, in the general formula (1), R ¹ represents an alkyl group having 1 to 15 carbon atoms, preferably an alkyl group having 1 to 10 carbon atoms, and more preferably an alkyl group having 1 to 8 carbon atoms. The alkyl group may be linear or branched. Examples of R ¹ include linear or branched alkyl groups such as methyl group, ethyl group, propyl group, methylpropyl group, butyl group, isobutyl group, t-butyl group, pentyl group, and hexyl group. can be mentioned.

P3HA preferably contains 50 mol% or more, more preferably 70 mol% or more of the 3-hydroxyalkanoate repeating unit represented by the general formula (1) based on the total monomer repeating units (100 mol%). , more preferably 80 mol% or more, even more preferably 90 mol% or more, even more preferably 95 mol% or more, and may be 100 mol%. In addition to the 3-hydroxyalkanoate repeating unit represented by general formula (1), P3HA may contain other repeating units such as 4-hydroxyalkanoate repeating units.

From the viewpoint of excellent marine degradability, P3HA is a 3-hydroxyalkanoate repeating unit represented by the general formula (1) in which R ¹ is a methyl group, that is, 3-hydroxybutyric acid (also called 3-hydroxybutyrate). (hereinafter also simply referred to as "3HB") repeating units preferably contain 50 mol% or more based on the total monomer repeating units (100 mol%), more preferably 70 mol% or more, and still more preferably 80 mol%. % or more, even more preferably 90 mol% or more, even more preferably 95 mol% or more, and may be 100 mol%. Specifically, for example, poly(3-hydroxybutyrate) (also referred to as "P3HB"), poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (also referred to as "P3HB3HV") ), poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (also referred to as "P3HB3HH"), poly(3-hydroxybutyrate-co-3-hydroxyvalerate-co-3) -hydroxyhexanoate) (also referred to as “P3HB3HV3HH”), poly(3-hydroxybutyrate-co-4-hydroxybutyrate) (also referred to as “P3HB4HB”), poly(3-hydroxybutyrate-co-4-hydroxybutyrate) (also referred to as “P3HB4HB”), poly(3-hydroxybutyrate-co-3-hydroxydecanoate), and poly(3-hydroxybutyrate-co-3-hydroxydecanoate). From the viewpoint of ocean degradability, it is preferable that all 3HB constituting P3HA be in the R form (D form). From the viewpoint of mechanical properties, P3HB3HH and/or P3HB4HB are preferable, and P3HB3HH is more preferable.

The composition ratio of repeating units (monomer structural units) of P3HB3HH is not particularly limited, but from the viewpoint of balance between flexibility and strength, the molar ratio of 3-hydroxybutyrate/3-hydroxyhexanoate is 99/1 to 3-hydroxybutyrate/3-hydroxyhexanoate. The ratio is preferably 80/20, and more preferably 97/3 to 85/15. One type of P3HB3HH may be used alone, or a mixture of two or more types having different composition percentages of 3HB may be used.

In this specification, the composition ratio of monomers in P3HA can be measured as follows. Add 2 mL of sulfuric acid-methanol mixture (volume ratio, sulfuric acid: methanol = 15:85) and 2 mL of chloroform to approximately 20 mg of the sample, seal it tightly, and heat it at 100°C for 140 minutes to convert the methyl ester of the polyester decomposition product. obtain. After cooling, 1.5 g of sodium hydrogen carbonate is added little by little to neutralize it, and the mixture is left to stand until the generation of carbon dioxide gas stops. After adding 4 mL of diisopropyl ether and mixing well, centrifugation was performed, and the composition of hydroxyalkanoic acid methyl ester of the polyester decomposition product in the supernatant was analyzed by capillary gas chromatography. ).

P3HA is not particularly limited and can be produced by a known method, but from the viewpoint of easily obtaining P3HA with high marine degradability, it is preferable to produce it by a production method using microorganisms. As the production method using microorganisms, known methods can be used. The microorganism is not particularly limited as long as it has the ability to produce P3HA. Examples of microorganisms capable of producing P3HA include Aeromonas caviae, Cupriavidus necator, Ralstonia eutropha, and Alcaligenes ratus. s latus), etc. In addition, in order to increase the productivity of P3HA, the Alcaligenes eutrophus AC32 strain (FERM BP-6038) into which genes for poly(3-hydroxyalkanoate) synthase group were introduced (J. Bateriol., 179 , p4821-4830 (1997)), etc. may be used. Furthermore, as P3HA, a commercially available product such as biodegradable polymer GP (Green Planet (registered trademark)) manufactured by Kaneka Corporation may be used.

The weight average molecular weight of P3HA is not particularly limited, but from the viewpoint of moldability and strength, it is preferably 50,000 to 3,000,000, more preferably 100,000 to 1,500,000. In this specification, the weight average molecular weight refers to that measured from polystyrene equivalent molecular weight distribution using gel permeation chromatography (GPC) using a chloroform eluent. As a column in the GPC, a column suitable for measuring the molecular weight may be used.

The melt flow rate (MFR) of P3HA is not particularly limited, but according to JIS K 7210-1:2014, the melt flow rate (MFR) measured under the conditions of a temperature of 165°C and a load of 5 kg (49 N) is 0.1. It is preferably 100 g/10 minutes, more preferably 1 to 50 g/10 minutes, even more preferably 10 to 40 g/10 minutes. When the melt flow rate is within the above-mentioned range, the fluidity of the molten resin will be within an appropriate range, and fiberization will be good.

In addition to P3HA, the P3HA-based fiber may contain a crystal nucleating agent and/or a lubricant. Furthermore, in one or more embodiments of the present invention, the P3HA-based fiber may contain other resin components and other additive components in addition to P3HA within a range that does not impede the effects of the present invention. For example, from the viewpoint of productivity and fiber properties, the P3HA-based fiber preferably contains 0.05 to 12 parts by weight, more preferably 0.1 to 10 parts by weight, of a crystal nucleating agent based on 100 parts by weight of P3HA. , more preferably 0.5 to 8 parts by weight, particularly preferably 1 to 5 parts by weight. In addition, from the viewpoint of productivity, the P3HA-based fiber preferably contains 0.05 to 12 parts by weight, more preferably 0.1 to 10 parts by weight, and more preferably 0.1 to 10 parts by weight of a lubricant per 100 parts by weight of P3HA. It is more preferable to contain 5 to 8 parts by weight, particularly preferably 1 to 5 parts by weight. Further, the P3HA-based fiber may contain other additive components, based on 100 parts by weight of P3HA, at most 5 parts by weight, at most 3 parts by weight, or at most 1 part by weight. Further, the P3HA-based fiber may contain other resin components in an amount of 20% by weight or less, 10% by weight or less, or 5% by weight or less based on the total amount (100% by weight) of P3HA and other resin components.

The P3HA-based fiber can be composed of a resin composition containing P3HA, for example. That is, P3HA-based fibers can be obtained by fiberizing a resin composition containing P3HA. The resin composition is not particularly limited, but preferably contains P3HA in an amount of 80% by weight or more, more preferably 85% by weight or more, and even more preferably 90% by weight or more. On the other hand, the upper limit may be 100% by weight, but may be, for example, 98% by weight or less or 95% by weight or less. By setting the content of P3HA to 80% by weight or more, the biodegradability and marine degradability of the pile fabric tend to be further improved.

Although the resin composition is not particularly limited, from the viewpoint of productivity and fiber properties, it is preferable that the resin composition further contains a crystal nucleating agent. The crystal nucleating agent is not particularly limited as long as it is a compound that has the effect of promoting crystallization of P3HA. For example, from the viewpoint of improving crystallization rate and inclusion in fibers, sugar alcohol compounds, polyvinyl alcohol, chitin, chitosan, etc. are preferred, sugar alcohol compounds are more preferred, and pentaerythritol is even more preferred. One type of crystal nucleating agent may be used alone, or two or more types may be used in combination.

The content of the crystal nucleating agent in the resin composition is not particularly limited, but for example, it is preferably 0.05 to 12 parts by weight, and preferably 0.1 to 10 parts by weight, based on 100 parts by weight of P3HA. The amount is more preferably 0.5 to 8 parts by weight, and particularly preferably 1 to 5 parts by weight. By setting the content of the crystal nucleating agent to 0.05 part by weight or more, the crystallization promoting effect tends to be improved and the productivity of fibers tends to be improved. Further, by controlling the content of the crystal nucleating agent to 12 parts by weight or less, it is easy to suppress a decrease in viscosity and a decrease in fiber physical properties during processing while maintaining a sufficient effect of accelerating the crystallization rate.

Although the resin composition is not particularly limited, from the viewpoint of productivity, it is preferable that the resin composition further contains a lubricant. The lubricant is not particularly limited as long as it is a compound that has the effect of imparting lubricity to P3HA. Examples include fatty acid amide, alkylene fatty acid amide, glycerin monofatty acid ester, organic acid monoglyceride, sorbitan fatty acid ester, polyglycerin fatty acid ester, and higher alcohol fatty acid ester.

Among the lubricants, compounds having the effect of imparting external lubricity, specifically fatty acid amides, glycerin fatty acid esters, and the like are preferred. Examples of fatty acid amides include monoamides and bisamides of fatty acids. The fatty acid (fatty acid moiety) constituting the fatty acid amide preferably has 12 to 30 carbon atoms, more preferably from the viewpoint of giving the resin composition a suitably high melting point and suppressing deterioration of processability during melt processing. has 18 to 22 carbon atoms. Specifically, fatty acid amides include behenic acid amide, erucic acid amide, palmitic acid amide, oleic acid amide, stearic acid amide, methylene bis stearic acid amide, ethylene bis stearic acid amide, ethylene bis oleic acid amide, and ethylene bis oleic acid amide. Examples include biserucic acid amide. Examples of glycerin fatty acid esters include glycerin monoesters, glycerin diesters, and glycerin triesters. Examples of glycerin triesters include glycerin diacetomonoesters such as glycerin diacetomonolaurate, glycerin diacetomonooleate, glycerin diacetomonostearate, glycerin diacetomonocaprylate, and glycerin diacetomonodecanoate. One type of lubricant may be used alone, or two or more types may be used in combination.

The content of the lubricant in the resin composition is not particularly limited, but for example, it is preferably 0.05 to 12 parts by weight, more preferably 0.1 to 10 parts by weight, based on 100 parts by weight of P3HA. The amount is preferably 0.5 to 8 parts by weight, more preferably 0.5 to 8 parts by weight, and particularly preferably 1 to 5 parts by weight. By setting the content of the lubricant to 0.05 parts by weight or more, the friction between the resin composition and the metal surface in the extruder or spinning machine is suppressed, the decomposition of P3HA due to shear heat generation is suppressed, and the P3HA is extruded from the nozzle. It is also easy to prevent fibers from adhering to each other. In addition, by setting the lubricant content to 12 parts by weight or less, P3HA melts more efficiently in the extruder, and as a result, fiber breakage is suppressed without making the fiber too hard, further improving productivity. It's easy to do.

The resin composition may contain plasticizers, inorganic fillers, organic fillers (cellulose, etc.), antioxidants, ultraviolet absorbers, dyes, pigments, etc., as necessary, within a range that does not impede the effects of the present invention. Other additive components such as colorants and antistatic agents may also be included. One type of other additive components may be used alone, or two or more types may be used in combination. The amount of other additive components added may be 5 parts by weight or less, or 1 part by weight or less with respect to 100 parts by weight of P3HA.

The resin composition may contain resin components other than P3HA (other resin components), if necessary, within a range that does not impede the effects of the present invention. As other resin components, biodegradable resins are preferred. Examples of other biodegradable resins include petroleum-derived resins such as polylactic acid, polycaprolactone, polybutylene adipate terephthalate, polybutylene succinate adipate, and polybutylene succinate, and natural polymers such as starch and cellulose. can be mentioned. As for the other resin components, one kind can be used alone, or two or more kinds can be used in combination. The content of other resin components is preferably 20% by weight or less, more preferably 10% by weight or less, still more preferably 5% by weight or less, based on the total amount (100% by weight) of the resin components.

P3HA-based fibers can be obtained, for example, by melt-spinning the resin composition.

First, a pellet-shaped resin composition obtained by melt-kneading the resin composition is melted using a melt extruder, and the molten resin composition is continuously extruded from a nozzle to form fibers. Spun filaments (undrawn filaments) can be produced. The melt spinning temperature is not particularly limited as long as it is higher than the melting point of the resin composition and lower than the thermal decomposition temperature, but for example, when the melting point of the resin composition is Tm, it is [Tm+5°C] to [Tm+40°C]. It may be [Tm+10°C] to [Tm+30°C]. More specifically, the temperature may be 145 to 180°C, 150 to 180°C, or 150 to 170°C. By setting the melt spinning temperature to 145° C. or higher, the resin composition can be sufficiently dissolved, so that spinning can be easily stabilized. Furthermore, by setting the spinning temperature to 180° C. or lower, thermal decomposition of P3HA is suppressed, the spinning is easily stabilized, and the physical properties of the resulting fiber tend to be further improved. Note that the melt spinning temperature refers to a temperature in the highest temperature range among the temperatures applied while the resin composition is fiberized.

In this specification, the glass transition temperature, crystallization temperature, melting point, and thermal decomposition temperature of the resin or resin composition are measured using a differential scanning calorimeter (for example, manufactured by TA Instruments, model number "DSC25"). It can be measured by differential scanning calorimetry under the conditions of a temperature range of 0 to 180°C, a temperature increase rate of 10°C/min, and a cooling rate of 10°C/min. Specifically, it can be measured as described in Examples.
In this specification, the glass transition temperature and melting point of the fibers are measured using a differential scanning calorimeter (for example, manufactured by TA Instruments, model number "DSC25") at a temperature range of 0 to 180°C and a heating rate of 10°C. It can be measured by differential scanning calorimetry under the conditions of a cooling rate of 10° C./min and a cooling rate of 10° C./min. Specifically, it can be measured as described in Examples. Note that the glass transition temperature and melting point of the fiber are equivalent to the melting point of the resin or resin composition constituting the fiber.

The resin composition is not particularly limited, but for example, from the viewpoint of moldability and fiber strength, the weight average molecular weight is preferably 50,000 to 3,000,000, and preferably 100,000 to 1,500,000. It is more preferable that

The environmental temperature when extruding the molten resin composition from the spinneret is not particularly limited, and when the glass transition temperature of the resin composition is Tg, it may be [Tg + 5 ° C] to [Tg + 50 ° C], [ [Tg+10°C] to [Tg+40°C]. More specifically, the temperature can be adjusted as appropriate within the range of, for example, 5 to 40°C. It is preferable to apply rectified air to the fibers (spun filaments) extruded from the spinneret. The rectified air is also called quench air, and has the function of stabilizing the flow of yarn. It is also possible to cool the spun filaments by using cooled gas as quench air. The temperature of the quench air is preferably 5 to 40°C, more preferably 10 to 30°C. When the temperature is 5° C. or higher, it is easy to suppress generation of residual stress in the fibers. When the temperature is 40° C. or lower, the resin is sufficiently solidified, and it is easy to prevent the fibers from sticking. The wind speed of the quench air is not particularly limited, but is preferably 0.1 to 3.0 m/sec, for example. If it is 0.1 m/sec or more, the rectification effect will be easily exhibited, and if it is 3.0 m/sec or less, the quenching wind will not be too strong, the yarn will not be disturbed, and fibers will stick to each other or yarn breakage will occur. It is suppressed from doing so.

Next, the spun filaments can be drawn to obtain drawn filaments (multifilaments). By drawing, fibers with a desired fineness can be obtained and the strength of the fibers can be increased. Stretching is not particularly limited, and may be carried out by a two-step spinning/drawing method or by a direct spinning/drawing method. In the two-stage spinning and drawing method, drawing is performed after the spun filament is wound up. In the direct spinning/drawing method, spinning and drawing are performed continuously without winding the spun filaments. Further, the stretching step may be performed in multiple stages by combining a plurality of roll pairs. The surface temperatures and speeds of the multiple rolls may be the same or different. The stretching temperature, specifically the surface temperature of the roll, is not particularly limited, but may be, for example, 30 to 100°C, or 40 to 90°C. The stretching ratio may be, for example, 1.5 to 20 times. When the stretching ratio is 1.5 times or more, the strength of the fiber can be further increased. Before stretching, an oil agent may be applied to the spun filaments as necessary.

The tensile strength of the drawn filament is preferably 0.5 to 10 cN/dtex, more preferably 0.7 to 10 cN/dtex, and even more preferably 1.0 to 10 cN/dtex. When the tensile strength of the drawn filament is within the above range, crimping is easy to be imparted, and the texture and tensile strength of the pile fabric using short fibers obtained by cutting after crimping are further improved. can be increased. In this specification, the tensile strength of the drawn filament can be measured based on JIS L 1013:2021.

Next, the drawn filament can be crimped to give it bulk. The crimping process is not particularly limited, and can be performed by, for example, a known crimping method such as a gear crimp method or a stuffing box method. As a result, the obtained P3HA-based fibers have crimps, specifically mechanical crimps. If desired, the drawn filaments may be preheated before crimping. The crimped drawn filament (crimped yarn) may be used as is as pile fiber, but from the viewpoint of productivity of pile fabric, it is desirable to use it as short fiber cut to a predetermined fiber length. That is, the P3HA-based fibers may be long fibers (drawn filaments) or short fibers. By using crimped P3HA short fibers as pile fibers, it is possible to suitably obtain a pile fabric that is excellent in feel and heat retention, and is lightweight and has a fleece-like or poodle-like appearance.

The fiber length of the P3HA short fibers is not particularly limited, but from the viewpoint of easily obtaining a pile fabric with a large pile height, for example, a pile height of 8 mm or more, it may be 20 to 176 mm, or 25 to 138 mm. The length may be 28 to 110 mm.

The number of crimps of the P3HA fiber is preferably 5 to 25 crimps/25 mm, more preferably 6 to 20 crimps/25 mm, from the viewpoint of achieving both short fiber card passability and soft texture of the pile fabric. Preferably, the number is 7 to 18 pieces/25 mm, more preferably 8 to 17 pieces/25 mm. The number of crimp of P3HA fiber can be measured as follows. Using crimped yarn or short fibers, the sample length is 30 mm, the number of crimp peaks in a length of 25 mm is counted under microscope observation, n = 15, and the averaged value is the number of crimp per 25 mm. do. In addition, when the fiber length of the short fiber is less than 25 mm, the number of crimps in the entire length may be counted under microscope observation to obtain the number of crimps, and then the number may be converted into the number of crimps per 25 mm.

In the crimping process, it is preferable to preheat the drawn filament at 60 to 120° C. and then apply crimps using a stuffing box at a stuffing box pressure of 0.001 to 0.1 MPa. The drawn filament may be preheated by, for example, wet heat treatment or dry heat treatment. The moist heat treatment can be performed using, for example, steam. The dry heat treatment may be performed using, for example, a hot air oven or an electric heater. The preheating temperature of the drawn filament is more preferably 60 to 110°C, even more preferably 70 to 100°C, even more preferably 80 to 90°C. The stuffing box pressure is more preferably 0.001 to 0.08 MPa, even more preferably 0.001 to 0.06 MPa, even more preferably 0.001 to 0.04 MPa.

From the viewpoint of texture, the P3HA-based fiber preferably has a single fiber fineness of 0.1 to 100 dtex, more preferably 0.5 to 50 dtex, even more preferably 1.0 to 25 dtex, and 1. Even more preferably it is .0 to 15 dtex. In this specification, the single fiber fineness of P3HA-based fibers can be measured by an autobibroscopy method.

From the viewpoint of mechanical strength, the P3HA short fibers preferably have a tensile strength of 0.3 to 6.0 cN/dtex, more preferably 0.5 to 6.0 cN/dtex, and even more preferably It is 1.0 to 6.0 cN/dtex. In this specification, the tensile strength of P3HA-based short fibers can be measured based on JIS L 1015:2021.

The weight average molecular weight of the P3HA fiber is not particularly limited, but is preferably 50,000 to 3,000,000, more preferably 100,000 to 3,000,000, and even more preferably 100,000 to 3,000,000. ,000 to 1,500,000, more preferably 100,000 to 500,000.

The P3HA-based fibers preferably have a softening point of 100°C or higher, more preferably 110°C or higher, and 120°C or higher, from the viewpoint of easily increasing the temperature conditions in the pile fabric manufacturing process such as polishing. is even more preferable. Further, the upper limit of the softening point is not particularly limited, but may be, for example, 150° C. or lower, or 140° C. or lower from the viewpoint of imparting good hair loss prevention properties. In this specification, the softening point of the fiber can be specifically measured as described in the Examples.

The P3HA-based fiber preferably has a dry heat shrinkage rate of 10.0 to 30.0% at 100°C from the viewpoint of not causing fusion between the fibers and obtaining a soft and good texture. More preferably, it is between 20% and 20%. In this specification, the 100°C dry heat shrinkage rate of the P3HA-based fiber is defined as the fiber length of the P3HA-based fiber before and after the heat treatment of 100 mg when the P3HA-based fiber is heat-treated for 15 minutes in a dry heat atmosphere at 100°C with no load. /dtex load, and can be calculated based on the following formula (1). In the following formula (1), L0 is the fiber length of the fiber before heat treatment, and L1 is the fiber length of the fiber after heat treatment. In this specification, the 100° C. dry heat shrinkage rate of the P3HA-based fiber can be specifically measured as described in Examples.
100℃ dry heat shrinkage rate (%) = [(L0-L1)/L0] x 100 (1)

(ground thread)
The ground yarn contains fibers having a higher softening point than P3HA-based fibers. This makes it possible to easily fuse at least a portion of the P3HA fibers present on the back side of the ground yarn while not fusing the P3HA fibers that are raised on the surface of the ground fabric in the thermocompression bonding process described below. Can be done. In addition, this prevents the ground structure from becoming hard during the thermocompression bonding process described below, making it easy to maintain good flexibility. From the viewpoint of biodegradability, it is preferable to use fibers that are biodegradable, particularly marine degradable, as the fibers that have a higher softening point than the P3HA fibers. As biodegradable fibers, synthetic fibers containing aliphatic polyesters other than P3HA, natural fibers, regenerated fibers, and the like can be used. Examples of aliphatic polyesters other than P3HA include polylactic acid. Examples of natural fibers include natural cellulose fibers and natural animal fibers. Examples of natural cellulose fibers include cotton fibers, kapok fibers, flax fibers, hemp fibers, ramie fibers, jute fibers, Manila hemp fibers, and kenaf fibers. Examples of natural animal fibers include wool fibers, mohair fibers, cashmere fibers, camel fibers, alpaca fibers, and angora fibers. Examples of regenerated fibers include regenerated cellulose fibers such as rayon, and regenerated protein fibers such as regenerated collagen fibers (for example, regenerated collagen fibers "Luxaire (registered trademark)" manufactured by Kaneka Corporation). As the ground yarn, for example, a spun yarn containing one or more of these biodegradable fibers can be used, and rayon, wool, cotton fiber, and regenerated collagen fiber, which do not have a softening point, or these fibers can be used. Spun yarns containing one or more types can be suitably used.

From the viewpoint of more effectively suppressing hair loss, it is preferable that the base yarn contains heat-fusible fibers in addition to fibers with a higher softening point than P3HA-based fibers, and the total of the fibers constituting the base yarn is 100%. In terms of weight%, the content of the heat-fusible fibers may be 5% by weight or more or 10% by weight or more. As the heat-fusible fiber, a fiber whose softening point is equal to or lower than the softening point of the poly(3-hydroxyalkanoate) fiber can be suitably used. For example, preferable examples include heat-fused polyester fibers, heat-fused nylon fibers, and the like. As the heat-fusible fibers, P3HA fibers used for pile fibers may be used. When a fiber yarn containing cotton fiber and P3HA-based fiber is used as the ground thread, the P3HA-based fibers derived from pile fibers existing on the back side of the ground thread and the P3HA-based fibers constituting the ground thread are fused in the thermocompression bonding process. It can prevent hair loss more effectively. The heat-fusible fibers may be used alone or in combination of two or more. From the viewpoint of increasing the flexibility of the pile fabric, the content of heat-fusible fibers is desirably 50% by weight or less, and 30% by weight or less, when the total amount of fibers constituting the ground yarn is 100% by weight. It is more preferable.

(pile fabric)
From the viewpoint of flexibility, the bending stiffness of the ground structure of the pile fabric should be 1.00×10 ^-4 N・m ² /m or less, and 3.00×10 ⁻⁵ N・m ² /m or less. is preferable, more preferably 1.0×10 ⁻⁵ N·m ² /m or less, and still more preferably 9.00×10 ⁻⁶ N·m ² /m or less. In addition, from the viewpoint of flexibility, the lower the bending rigidity of the base structure of the pile fabric, the better, and the lower limit is not particularly limited, but for example, from the viewpoint of workability during product sewing, it is 5.00 × 10 ^-6 N. It may be m ² /m or more. In this specification, the bending rigidity of the ground structure of a pile fabric is measured using the ground structure as a sample, and specifically, it can be measured as described in the Examples.

Pile fabric has pile fibers in the pile part that are not fused and has an excellent texture. The rate of change (hereinafter also referred to as 140°C dry heat shrinkage rate) is preferably 15.0 to 40.0%, more preferably 18.0 to 38.0%, and 20.0 to 40.0%. More preferably, it is 35.0%. In this specification, the 140° C. dry heat shrinkage rate of the pile fabric can be specifically measured as described in Examples.

From the viewpoint of effectively suppressing hair loss, the amount of hair loss of the pile fabric is preferably 0.60 g/m ² or less, more preferably 0.50 g/m ² or less, and 0.40 g/m 2 or less. It is more preferably less than m ² , and even more preferably less than 0.30 g/m ² . The lower limit of the shedding amount of the pile fabric is preferably as close to 0 g/m ² as possible, but it may be 0.01 g/m ² or more. In this specification, the amount of hair loss can be specifically measured as described in Examples.

The pile fabric is not particularly limited, but from the viewpoint of lightness and heat retention, the weight per unit length (fabric weight) is preferably 300 to 3500 g/m, more preferably 300 to 2000 g/m. , more preferably 300 to 1200 g/m. In this specification, the weight per unit length of the pile fabric can be measured as described in the Examples.

The pile height of the pile fabric is not particularly limited and can be set as appropriate depending on the intended use, and may be, for example, 2 to 120 mm. From the viewpoint of suitable use as clothing fabric, the thickness is preferably 2 to 70 mm, more preferably 5 to 60 mm.

Pile fabric is suitably used as eco-fur, and specifically can be used for clothing fabrics such as jackets and coats, fabrics for toys such as stuffed animals, and bedding products such as blankets and sheets.

The pile fabric may be a pile fabric or a pile knit fabric. When used as a clothing fabric, it is preferably a pile knitted fabric from the viewpoints of flexibility, bulk, heat retention, breathability, drapability, and the like. The pile knitted fabric may have a fleece-like texture or a poodle-like texture from the viewpoints of flexibility, bulkiness, heat retention, and the like. The pile knitted fabric may be a high pile knitted fabric with a pile height of 15 to 100 mm.

In pile knitting, the ground texture may be a stockinette ground texture. More specifically, the pile knitted fabric includes a stockinette ground structure and pile fibers that are raised on the surface of the ground structure while being entwined with the ground yarns constituting the ground structure. In the case of pile knitted fabrics, since the ground texture is stockinette, it is possible to construct a texture with excellent elasticity. Stockinette is generally a fabric made by creating a loop with one or more threads, hooking it to that loop, and continuing to create the next new loop, making the loops continuous in a plane. be. Weft-knitted knitting is a process in which the yarn progresses in the horizontal direction, such as by making loops and reciprocating from side to side to form a flat fabric, or by progressing in a spiral to form a cylindrical fabric. Warp-knitted knitting is a fabric in which a large number of warp threads arranged in an orderly manner create loops and are connected to adjacent left and right warp threads through the loops to form a fabric. Further, flat knitted stockinette includes knitting methods such as flat knitting, rubber knitting, and purl knitting, and warp knitted stockinette has knitting methods such as Denby knitting, cord knitting, atlas knitting, and chain knitting. As the method of knitting the ground structure of the pile knit, flat knit stockinette is preferable from the viewpoints of marketability and productivity.

In pile knitted fabrics, the arrangement of the pile fibers with respect to the stockinette may be arranged so that the pile fibers are entwined with all loops of the ground yarn that constitutes the stockinette of the ground structure, or The loops may be arranged so as to have portions in which pile fibers are not entangled in the wale direction and/or the course direction.

Hereinafter, pile fabrics according to one or more embodiments of the present invention will be described using the drawings. FIG. 1 is a schematic explanatory diagram of an example of pile fabric. The pile fabric 1 is composed of a ground yarn 2 and pile fibers 4 that are spread around the ground yarn 2 (loop of the ground yarn) on the surface of the fabric structure to form a pile portion 3. In addition, on the back surface of the pile fabric 1, at least a portion of the pile fibers 4 are fused to the outside of the ground yarn 2 to form a fused portion 5, which is crimped to the ground yarn 2.

(Method for manufacturing pile fabric)
In one or more embodiments of the present invention, a method for manufacturing a pile fabric can include, for example, a process of producing a pile fabric, and a process of subjecting the pile fabric to thermocompression bonding from the back side of the ground structure. The pile fabric can be produced by a general known method except for using the ground yarn and pile fibers described above.

The thermocompression bonding process is carried out at a temperature of (1) above the softening point of the poly(3-hydroxyalkanoate)-based fiber and below the melting point of the poly(3-hydroxyalkanoate)-based fiber +10°C, and (2) on the poly(3-hydroxyalkanoate) fiber in the ground yarn. -Hydroxyalkanoate)-based fibers) is carried out under temperature conditions that satisfy the requirement that the softening point is lower than the softening point of the fiber, which is higher than that of the fiber. This makes it possible to fuse at least a portion of the P3HA fibers that are present on the back side of the ground yarn among the pile fibers entwined with the ground yarn, while not fusing the P3HA fibers that are raised on the surface of the ground texture. Therefore, hair loss can be prevented and the texture of the pile portion and the flexibility of the ground structure can be improved. When the temperature during the thermocompression bonding treatment is equal to or higher than the softening point of the poly(3-hydroxyalkanoate) fibers, at least a portion of the P3HA fibers present on the back side of the ground yarn can be fused. If the temperature during the thermocompression bonding treatment is below the melting point of poly(3-hydroxyalkanoate) fibers by 10°C or less, the pile fibers entangled with the ground yarns in addition to the pile fibers on the back side of the pile fabric are inhibited from fusing. However, it is possible to suppress the ground tissue from becoming hard. If the temperature during the thermocompression bonding treatment is below the softening point of the fiber, which has a higher softening point than the poly(3-hydroxyalkanoate) fiber in the ground yarn, the P3HA fibers raised on the surface of the ground texture will not fuse.

The temperature conditions in the thermocompression bonding treatment are preferably at least the softening point of poly(3-hydroxyalkanoate) fibers +5°C and below the melting point of poly(3-hydroxyalkanoate) fibers, more preferably at The softening point of the poly(3-hydroxyalkanoate) fiber is +5°C or higher, and the melting point of the poly(3-hydroxyalkanoate) fiber is -10°C or lower.

The thermocompression bonding treatment can be carried out, for example, by placing the pile fabric so that its back side is in contact with a heating roll or hot plate, and applying pressure with a rubber roll or the like. When using a heating roll or hot plate, a short-time thermocompression bonding process can be performed, and the pile fibers (poly(3-hydroxyalkanoate) fibers) arranged outside the ground threads on the back side of the ground texture. At least a portion of the material can be thermocompression bonded. Since the pile fibers (poly(3-hydroxyalkanoate) fibers) on the surface of the pile fabric are not heated to the extent that they are melted, the pile fibers raised on the surface of the base structure are not melted. As the heating roll, a metal roll whose surface is coated with a fluororesin such as polytetrafluoroethylene can be used.

When and/or after thermocompression bonding the pile fabric from the back side, it is preferable to cool the pile fiber side that is raised on the surface of the pile fabric. Further, after the pile fabric is subjected to thermocompression bonding from the back side, it is preferable that the back side of the pile fabric is cooled. As the cooling means, it is preferable to cool the front and/or back surfaces of the pile fabric with a cooling roll through which water having a temperature of 50° C. or lower is passed. The temperature of the water passed through the cooling roll is preferably 10 to 40°C, more preferably 10 to 35°C, and still more preferably 15 to 30°C, from the viewpoint of cooling efficiency and productivity. By performing such cooling, the dimensional stability of the pile fabric is high, and thermal damage to the pile fibers can also be reduced.

Hereinafter, an example of the thermocompression bonding process will be explained in more detail using the drawings.

FIG. 2 is a manufacturing process diagram schematically showing the process of thermocompression bonding a pile fabric from the back side at a predetermined temperature. The processing device 10 used for the thermocompression bonding process includes a heating roll 11, a cooling rubber roll 12 that pressurizes the heating roll 11, and through which water at a temperature of 50°C or lower passes through the cooling rubber roll 12, and a cooling rubber roll 12 that pressurizes the cooling rubber roll 12 and allows water at 50°C or less to flow inside. It includes a metal cooling roll 13 through which water passes, a metal cooling roll 14 through which water at a temperature of 50° C. or below passes, and a guide roll 15. The pile fabric raw material 18 is led out from the container 16 and supplied so that the back surface 18b is in contact with the heating roll 11 and the front surface (pile portion side) 18a is in contact with the cooling rubber roll 12. Further, after being subjected to the thermocompression bonding process, the back surface 18b is cooled by the metal cooling roll 14. The pile fabric 19 that has been processed is stored in the container 17.

The thermocompression bonding process is not limited to the processing apparatus shown in FIG. 2, and may be performed using a device with a partially modified configuration of the processing apparatus shown in FIG. 2, a hot plate, and other devices. For example, a rubber roll that does not have a cooling effect can be used instead of the cooling rubber roll 12, and the metal cooling roll 13 may be omitted.

In the thermocompression bonding process, the nip pressure is 0.01 to 100 Kgf/cm ² (0.98 KPa to 9.8 MPa), the supply speed of the pile fabric is 0.1 to 20 m/min, and the heater (heating roll, etc.) is used. ) The contact time is preferably 1 to 60 seconds. In addition, from the perspective of reducing damage to the surface of the pile fabric, the nip pressure should be 2.0 to 80 Kgf/cm ² (0.20 to 7.84 MPa), and the heater contact time should be 1 to 10 seconds. is more preferable.

In the case of a pile knitted fabric such as a high pile knitted fabric, since the high pile knitted fabric contracts in the wale direction during the thermocompression bonding process, stretching treatment may be performed in the wale direction after the thermocompression bonding process. Such stretching treatment can be performed using a known device such as a tenter. A tenter is generally used to widen and heat set the fabric to a predetermined width by holding both edges of the fabric while heating it at a predetermined temperature. It may or may not be heated, as in In addition, there are two methods for holding tenters: a clip tenter method and a pin tenter method. Either method may be used, but from the viewpoint of process stability and/or productivity, the pin tenter method is used. It is preferable to do so.

If the stretching treatment after the thermocompression bonding treatment is performed while heating the high pile knitted fabric, it is preferable to perform it at the minimum necessary temperature and minimum necessary air volume so as not to damage the surface of the high pile knitted fabric. For example, during the stretching process, the temperature is preferably 0°C or higher and below the softening point of the poly(3-hydroxyalkanoate) fiber, or 10°C or higher and the softening point of the poly(3-hydroxyalkanoate) fiber. The softening point of the poly(3-hydroxyalkanoate) fiber is more preferably -10°C or lower, more preferably 20°C or higher and the softening point of the poly(3-hydroxyalkanoate) fiber -20°C or lower.

The stretching treatment may also be performed before the thermocompression bonding treatment. The stretching treatment before the thermocompression bonding treatment may be performed at room temperature (5 to 35°C).

In order to make the pile fabric uniform, the pile fibers raised on the surface of the fabric may be polished before and/or after the thermocompression bonding process. Note that polishing before the thermocompression bonding process is also referred to as pre-polishing. Polishing is not always necessary, but when polishing is performed, polishing is performed at a temperature equal to or higher than the glass transition temperature of the poly(3-hydroxyalkanoate) fiber, and at a softening point of -40 It is necessary to carry out at a temperature below ℃. As a result, the P3HA fibers standing on the surface of the ground structure are not fused and the soft feel of the pile portion can be maintained. Polishing is preferably carried out at a temperature that is higher than the glass transition temperature of the poly(3-hydroxyalkanoate) fiber by +30°C and lower than the softening point of the poly(3-hydroxyalkanoate) fiber by -40°C. It is more preferable to conduct the reaction at a temperature that is higher than the glass transition temperature of the poly(3-hydroxyalkanoate) fiber by +35°C and lower than the softening point of the poly(3-hydroxyalkanoate) fiber by -45°C. It is more preferable to carry out the heating at a temperature that is higher than the glass transition temperature of the poly(3-hydroxyalkanoate) fiber by +40°C and lower than the softening point of the poly(3-hydroxyalkanoate) fiber by -50°C.

After the polishing treatment after the thermocompression bonding treatment, tumble treatment may be performed within a range that does not impede the object of the present invention. By performing the tumble treatment, the fibers are converged and curled, making it possible to obtain a product with a so-called sheep-like or poodle-boa look. The tumble treatment may be performed, for example, at a temperature above the glass transition temperature and below the softening point of the poly(3-hydroxyalkanoate) fiber. Further, it is preferable to carry out at a temperature of 30°C or higher, the softening point of poly(3-hydroxyalkanoate) fibers -10°C or lower, and a temperature of 60°C or higher and a softening point of poly(3-hydroxyalkanoate) fibers of -20°C or lower. It is more preferable.

After use, pile fabrics and products such as clothing made using them biodegrade if left in an environment where microorganisms exist, so they do not require special disposal and are environmentally friendly.

Hereinafter, one or more embodiments of the present invention will be described in more detail based on Examples. Note that the present invention is not limited to these examples.

The measurement methods and evaluation methods used in the Examples and Comparative Examples are as follows.

(Fiber physical properties)
(1) Single fiber fineness Measured by autobibroscopic method. Specifically, 20 fibers were arbitrarily selected from drawn filaments or short fibers, and the fineness of each fiber was measured using an autobibro-type fineness measuring device "DENIER COMPUTER Type DC-11" (manufactured by Saatchi Corporation). The results were averaged to obtain the single fiber fineness.
(2) Tensile strength The tensile strength of short fibers was measured based on JIS L 1015:2021. Specifically, 20 fibers were arbitrarily selected from the short fibers, and each fiber was measured using a tensile measuring device Autograph AG-I (manufactured by Shimadzu Corporation) at a tensile speed of 20 mm/min and a grip interval of 20 mm. The load at the time of cutting was measured under the conditions of a load cell with a rated capacity of 5N, and the results were averaged to determine the tensile strength.
(3) 100°C dry heat shrinkage rate The fibers were heat-treated for 15 minutes in a dry heat atmosphere at 100°C with no load using a thermomechanical analyzer (TMA, manufactured by Hitachi High-Tech Science, model number "TMA/SS6100"). The fiber length before and after the heat treatment was measured under a load of 100 mg/dtex, and the dry heat shrinkage rate at 100° C. was calculated based on the following formula (1). In the following formula (1), L0 is the fiber length of the fiber before heat treatment, and L1 is the fiber length of the fiber after heat treatment.
100℃ dry heat shrinkage rate (%) = [(L0-L1)/L0] x 100 (1)
(4) Softening point When 1g of fiber is opened, placed on a hot plate heated to an arbitrary temperature, and pressed for 3 seconds at a pressure of 0.07 Kgf/ ^cm2 , each single fiber on the surface in contact with the hot plate The temperature at which the fibers softened and bonded to form a plate shape was defined as the softening point of the fibers.
(5) Glass transition temperature and melting point Using a differential scanning calorimeter (manufactured by TA Instruments, model number “DSC25”), the measurement temperature range is 0 to 180°C, the heating rate is 10°C/min, and the cooling rate is 10°C/min. The glass transition temperature and melting point of the fibers were measured by differential scanning calorimetry under conditions of 10 minutes.

(Physical properties of pile fabric)
(1) Weight: Collect samples cut into 30cm x 30cm squares from the pile fabric, set n = 5, measure the weight of each sample, take the averaged value as w (g), and calculate the pile size using the following formula. The fabric weight W (g/m) was calculated.
W (g/m)=w×16.67
(2) Pile height The pile fabric was placed on a horizontal table and the pile fibers were adjusted by hand. As shown in FIG. 1, the distance 8 from the top 6 of the ground texture to the top 7 of the pile fibers was measured with a ruler. The average value measured at five arbitrary locations was defined as the pile height of the pile fabric.
(3) Bending rigidity After cutting the pile fabric into a 5 cm x 5 cm square, the pile fiber portion was cut from the root with scissors to prepare a sample consisting only of the ground texture portion. The sample was set in a KBS-FB2 pure bending tester (manufactured by Kato Tech Co., Ltd.), and the B value (bending hardness) was measured under the condition of a bending curvature of 2.5 cm ^-1 . Measurements were made with N=2, and the average value was taken as the bending rigidity (N·m ² /m) of the ground structure of the pile fabric.
(4) Flexibility (a) The pile fabric was cut lengthwise into 20 mm width pieces to obtain fabric pieces with a length of 200 mm and a width of 20 mm.
(b) As shown in FIG. 3, a pile fabric piece 21 was placed on a horizontal table 22 (width 600 mm, length 600 mm) made of melamine resin. Next, the fabric piece 21 of the pile fabric was slid little by little from the horizontal table 22 to the outside of the horizontal table 22 along the direction of the pile fabric.
(c) As shown in Figure 4, until the angle a between the tangent 31 drawn to the tip of the pile fabric piece 21 that has come out from the horizontal table 22 and the horizontal table 22 becomes 90°. A fabric piece 21 of pile fabric was slid.
(d) The distance L (90° distance) that the fabric piece 21 of the pile fabric slid from the horizontal table 22 was measured, and the flexibility was evaluated according to the following criteria.
A: 90° distance is less than 50mm (pile fabric is quite soft)
B: 90° distance is 50 mm or more and 55 mm or less (pile fabric is soft)
C: 90° distance exceeds 55 mm (pile fabric is hard; fail)
(5) Amount of hair loss The surface of the pile fabric was brushed with a rubber brush (product name "Prescale Mat" 5 mm (particle diameter), length 4 cm, width 10.5 cm, manufactured by Fuji Film Co., Ltd.), and a 600 g load ( While applying a constant load of 14.3 kg/cm ² ), rub the hair 10 times in the forward direction and 10 times in the opposite direction with a stroke width of 30 cm, collect the loose hair with adhesive tape, and convert the weight to 1 m ² . The amount of hair loss was determined.
(6) Evaluation of hair loss Based on the amount of hair loss, evaluation of hair loss was performed in the following four ranks.
A: 0.3g/ ^m2 or less (very good level)
B: More than 0.3g/ ^m2 and less than 0.6g/ ^m2 (good level)
C: More than 0.6g/ ^m2 and less than 1.0g/ ^m2 (slightly poor level)
D: Exceeding 1.0g/ ^m2 (defective level)
(7) Fusion of the ends of the hair The pile fabric was placed on a horizontal table, and the fusion of the ends of the hair in the pile was confirmed visually and by touch.
No fusion: No fusion was visually confirmed, and the tips of each pile fiber in the pile part were independent. When you touch the surface of the fabric with your hand, it feels smooth to the touch, with no visible fusion of the tips of the hair. FIG. 5 is a photograph of the surface of the pile portion of an example of pile fabric in which the ends of the hair are not fused.
Fusion: Fusion is visually confirmed, and the tips of multiple pile fibers in the pile part are fused. When you touch the surface of the fabric with your hand, you can see that the ends of the hair are fused together, and the fused areas give a rough and hard feel. FIG. 6 is a photograph of the surface of the pile portion of an example of a pile fabric in which the ends of the hair are fused.
(8) Dry heat shrinkage rate at 140°C A sample piece cut into a 5 cm x 5 cm square was taken from the pile fabric, and a mark was marked on the back side of the sample piece with a magic pen. Place the marked sample piece on a horizontal table, and as shown in FIG. , the distance 51 from the top 6 of the ground texture to the leading edge 9 of the pile fibers was measured. This distance was defined as the length L2 of the pile fiber before heat treatment. Subsequently, this sample piece was heat-treated for 15 minutes under a dry heat atmosphere at 140° C. without any load. The length L3 of the pile fibers at the marked locations after the heat treatment was measured in the same manner, and the dry heat shrinkage rate at 140° C. was calculated based on the following formula (2). n=5, and the averaged value was taken as the 140°C dry heat shrinkage rate (%) of the pile fabric.
140℃ dry heat shrinkage rate (%) = [(L2-L3)/L2] x 100 (2)
(9) Texture Texture was evaluated in four ranks as shown below.
A: There is no fusion in the pile fibers that are raised on the surface of the ground texture, and the level is equivalent to pile fabric that is not heat treated.B: Slightly inferior to rank A, but there is no fusion in the pile fibers that are raised on the surface of the ground texture. Level C: Slightly rough and hard, causing a practical problem (fail)
D: Extremely rough and hard and cannot be put to practical use (fail)

The following fibers were used in the Examples and Comparative Examples.
(pile fiber)
Pile fiber 1: P3HB3HH staple fibers from Production Example 1, which will be described later, were used.
(ground thread)
Ground yarn 1: Two cotton spun yarns with a cotton count of 40 were aligned and used. Spun cotton yarn has no softening point.
Ground yarn 2: Two spun yarns of cotton count 30 made by blending cotton fibers with a fiber length of 28.6 to 34.1 mm and P3HB3HH fibers of Production Example 1 described later in a ratio of 50 parts by weight: 50 parts by weight are aligned. I used it. Cotton fibers do not have a softening point.

(Manufacturing example 1)
As P3HB3HH, 100 parts by weight of a copolymer resin (manufactured by Kaneka Co., Ltd.) with a molar composition ratio of 3HB units / 3HH units of 94/6, Mw of 350,000, and MFR (165 ° C., 5 kg) of 12 g / 10 minutes. , 1.0 parts by weight of pentaerythritol (manufactured by Nippon Gosei Kagaku Co., Ltd., "Neurizer P") as a crystal nucleating agent, and 0.5 parts by weight of erucic acid amide and 0.5 parts by weight of behenic acid amide as lubricants. Dry blending was performed, and the mixture was melt-kneaded using an extruder at 150° C. to pelletize, thereby obtaining a pellet-shaped resin composition. The resulting pellet-shaped resin composition had a glass transition temperature of 2°C, a crystallization temperature of 100°C, a melting point of 146°C, a thermal decomposition temperature of 180°C, and a weight average molecular weight of 350,000. The glass transition temperature, crystallization temperature, melting point, and thermal decomposition temperature of the pelletized resin composition were measured using a differential scanning calorimeter (manufactured by TA Instruments, model number "DSC25") within the measurement temperature range of 0 to 0. The weight average molecular weight of the pellet-shaped resin composition was determined by differential scanning calorimetry at 180°C, a temperature increase rate of 10°C/min, and a cooling rate of 10°C/min. It was measured from polystyrene equivalent molecular weight distribution using permeation chromatography (GPC).
The obtained resin composition (pellets) was melted using a kneading extruder (single-screw extruder, screw diameter 25 mm). The obtained melt was discharged from a spinning nozzle (temperature: 175° C., shape of discharge hole: circular, diameter of discharge hole: 0.3 mm, number of discharge holes: 368) to obtain a spun filament. The flow rate of the melt was adjusted to 12.2 kg/h using a gear pump. Next, in the spinning cylinder, air at 20° C. was blown onto the spun filaments discharged from the circumferential direction at a speed of 0.7 m/s.
The cooled spun filament is taken up by the first take-up roll section (speed: 448 m/min), transported in order by the first to fourth transport roll sections (speed: 471 m/min), and then the first winding is carried out. It was taken up by a take-up roll section (speed: 461 m/min) and stored at room temperature (5 to 35°C) for 18 hours.
Next, the spun filament (undrawn filament) is taken up from the first take-up roll part by a second take-up roll part (speed: 50 m/min, roll temperature: 30°C), and the drawn roll part (110 m/min, roll The film is stretched at a temperature of 90°C), transported by a take-off roll section (heat treatment roll section) (speed: 110 m/min, roll temperature: 100°C), and wound at a second winding roll section (speed: 100 m/min). By taking the sample, a drawn filament was obtained. The stretching ratio was 2.0 times. In addition, as the take-up roll part and the conveyance roll part, a roll part comprised of two rolls each having the same speed and the same temperature was used.
After the obtained drawn filaments were doubled to a suitable fineness and preheated to 100°C with steam, they were fed to a stuffing box at a conveyance speed of 8.7 m/min, and a nip pressure of 2.0 Kg/cm ² was applied. P3HB3HH staple fibers were obtained by crimping the yarn under a stuffing pressure of 0.04 MPa and cutting the resulting crimped yarn using a tow cutter to have a fiber length of 51 mm. The obtained P3HB3HH short fibers had a single fiber fineness of 6.0 dtex, a tensile strength of 1.51 cN/dtex, a 100°C dry heat shrinkage rate of 15.3%, a glass transition temperature of 2°C, a melting point of 146°C, and a softening point. The temperature was 125° C. and the weight average molecular weight was 250,000.

(Example 1)
A sliver knitting machine (circular knitting machine) was used to produce eco-fur. Ground yarn 1 and pile fiber sliver (10 to 14 g/m) consisting of the P3HB3HH short fibers of Production Example 1 were fed to the circular knitting machine to knit a high pile knitted fabric. The number of loops in the wale of the ground texture was 16 to 17/inch, and the number of loops in the course was 22 to 33/inch. Next, the pile fibers on the raised side of the high pile knit were adjusted by pre-polishing and pressing. Specifically, first, pre-polishing was performed twice at 80° C., and then pressuring was performed twice. Thereafter, the width of the high pile knitted fabric was stretched from 140 cm to 160 cm using a pin tenter dryer while keeping the temperature inside the dryer at room temperature (5 to 35° C.).
The high pile knitted fabric (width 160 cm) obtained above was bonded using the thermocompression bonding device shown in Fig. 2, with the temperature of the heating roll being 130°C, the contact time between the heating roll and the high pile knitting fabric being 5 seconds, and the heating roll and cooling. A thermocompression bonding process was performed from the back side under the condition that the nip pressure between the rubber rolls was 50 Kgf/cm ² (4.9 MPa). At that time, the width of the high pile knitted fabric shrank to 135 cm. Thereafter, the high pile knitted fabric was dried for 3 minutes using a pin tenter dryer at a dryer internal temperature of 70° C. while being stretched to a width of 160 cm, and cooled to 50° C. or lower while maintaining the width at 160 cm.
In the obtained high pile knitted fabric, the pile fibers on the surface of the pile fabric were adjusted by polishing, brushing and shirring. Specifically, first, brushing was performed twice, then polishing was performed twice at 80°C, then shearing was performed twice, and finally polishing was performed once at 80°C. Finally, a fleece-like high pile knitted fabric with a basis weight of 800 g/m and a pile height of 18 mm was obtained.

(Example 2)
A fleece-like high pile knitted fabric having a basis weight of 800 g/m and a pile height of 18 mm was obtained in the same manner as in Example 1, except that the temperature of the heating roll was 140° C. during the thermocompression bonding process.

(Example 3)
A fleece-like high pile knitted fabric having a basis weight of 800 g/m and a pile height of 18 mm was obtained in the same manner as in Example 1 except that the temperature of the heating roll was 150° C. during the thermocompression bonding process.

(Example 4)
The high pile knitted fabric obtained in the same manner as in Example 1 was further tumbled for 15 minutes in a tumble dryer heated to 110°C to obtain a poodle-like high pile knitted fabric with a basis weight of 800 g/m and a pile height of 15 mm. Ta.

(Example 5)
A fleece-like high pile knitted fabric having a basis weight of 800 g/m and a pile height of 18 mm was obtained in the same manner as in Example 1 except that polishing was not performed.

(Example 6)
A fleece-like high pile knitted fabric having a basis weight of 800 g/m and a pile height of 18 mm was obtained in the same manner as in Example 1 except that the above-mentioned ground yarn 2 (cotton-P3HB3HH blended yarn) was used as the ground yarn.

(Comparative example 1)
A fleece-like high pile knitted fabric having a basis weight of 800 g/m and a pile height of 18 mm was obtained in the same manner as in Example 1, except that the temperature of the heating roll was 120° C. during the thermocompression bonding process.

(Comparative example 2)
A fleece-like high pile knitted fabric having a basis weight of 800 g/m and a pile height of 18 mm was obtained in the same manner as in Example 1 except that the temperature of the heating roll was 160° C. during the thermocompression bonding process.

(Comparative example 3)
When preparing the pile fibers on the surface of the pile fabric by polishing, brushing and shirring after thermocompression bonding, first brushing is done twice, then polishing is done 3 times at 90℃, then shirring is done twice, and finally A fleece-like high pile knitted fabric having a basis weight of 800 g/m and a pile height of 18 mm was obtained in the same manner as in Example 3, except that polishing was performed twice at 90°C.

(Comparative example 4)
When preparing the pile fibers on the surface of the pile fabric by polishing, brushing and shirring after thermocompression bonding, first brushing is performed twice, then polishing is performed 3 times at 110°C, then shirring is performed twice, and finally A fleece-like high pile knitted fabric having a basis weight of 800 g/m and a pile height of 18 mm was obtained in the same manner as in Example 3, except that polishing was performed twice at 110°C.

(Comparative example 5)
A fleece-like high pile knitted fabric having a basis weight of 800 g/m and a pile height of 18 mm was obtained in the same manner as in Example 1, except that backing treatment was performed instead of thermocompression bonding treatment to prevent shedding of the pile fabric. The method of backing processing is as shown below. After finishing the pressing and pre-polishing, the back surface of the obtained pile fabric was impregnated with a backing resin. As the backing resin, an emulsion copolymer latex containing acrylic acid ester as a main component was used, and an aqueous solution (emulsion) with a latex concentration of 40 wt % was used, and the resin was impregnated with a solid content of 50 g/m ² . Thereafter, the high pile knitted fabric was dried for 3 minutes using a pin tenter dryer at a dryer internal temperature of 130° C. while being stretched to a width of 160 cm, and then cooled to 80° C. or lower while maintaining the width at 160 cm.

The manufacturing conditions for the pile fabrics of Examples and Comparative Examples are shown in Table 1 below. The flexibility, hair loss amount, hair loss evaluation, hair tip fusion, 140 ° C. dry heat shrinkage rate and texture of the pile fabrics of Examples and Comparative Examples, and the bending rigidity of the ground structure of the pile fabrics were measured and evaluated as described above, The results are shown in Table 2 below.

The pile fabrics of Examples 1 to 6 were evaluated as A to B in terms of softness, shedding, and texture, and satisfied each characteristic required of pile fabrics. Among them, Example 6, in which cotton-P3HB3HH blended yarn was used as the ground yarn, had a shedding evaluation of A, and had particularly excellent shedding characteristics.

On the other hand, in Comparative Example 1 in which the temperature of the heating roll during the thermocompression bonding process was set at 120° C., the pile fibers on the back side of the pile fabric were not fused, and the shedding was evaluated as D. In addition, in Comparative Example 2 in which the temperature of the heating roll during the thermocompression bonding process was set at 160°C, the bending rigidity of the ground structure exceeded 1.00 × 10 ^-4 , and in addition to the pile fibers on the back side of the pile fabric, The pile fibers entwined with the ground yarns were also fused, making the ground structure stiff and the flexibility of the pile fabric was rated C. Furthermore, the pile fabrics of Comparative Example 3, which was polished at 90° C., and Comparative Example 4, which was polished at 110° C., had fused hair tips and was rated D in feel. In the pile fabric of Comparative Example 5, which was subjected to backing treatment at a tenter temperature of 130° C. instead of thermocompression bonding treatment, the fibers in the pile portion were shrunk and fused, and the texture was rated D.

The present invention is not particularly limited, but may include the following embodiments.
[1] A pile fabric comprising a ground weave and pile fibers that are entwined with the ground threads constituting the ground weave and are raised on the surface of the ground weave,
The pile fibers include poly(3-hydroxyalkanoate) fibers,
The ground yarn includes fibers having a higher softening point than the poly(3-hydroxyalkanoate)-based fibers,
Among the pile fibers entwined with the ground yarn, at least a portion of the poly(3-hydroxyalkanoate) fibers present on the back side of the ground yarn are fused,
When the pile fabric is heat treated in a dry heat atmosphere at 140° C. for 15 minutes without any load, the change rate of the length of the pile fibers before and after the heat treatment is 15.0 to 40.0%,
The pile fabric is characterized in that the bending rigidity of the base structure of the pile fabric is 1.00×10 ⁻⁴ N·m ² /m or less.
[2] The pile fabric according to [1], wherein the fibers that have a higher softening point than the poly(3-hydroxyalkanoate) fibers contained in the ground yarn include biodegradable fibers.
[3] The pile fabric according to [2], wherein the biodegradable fibers include one or more fibers selected from the group consisting of natural cellulose fibers, natural animal fibers, and regenerated cellulose fibers.
[4] The ground yarn further includes a heat-fusible fiber, and the softening point of the heat-fusible fiber is equal to or lower than the softening point of the poly(3-hydroxyalkanoate)-based fiber, [1] to [3] ] The pile fabric according to any one of the above.
[5] The pile fabric according to [2] or [3], wherein the ground yarn contains one or more fibers selected from the group consisting of cotton fibers, rayon, wool, and regenerated collagen fibers as biodegradable fibers.
[6] The pile fabric according to [5], wherein the ground yarn further contains poly(3-hydroxyalkanoate) fibers as heat-fusible fibers.
[7] The pile fabric according to any one of [1] to [6], which is a pile knitted fabric.
[8] The pile fabric according to any one of [1] to [7], which has a pile height of 8 mm or more.
[9] The pile fabric according to [4], wherein the heat-fusible fibers include poly(3-hydroxyalkanoate) fibers.
[10] A step of manufacturing a pile fabric including a ground texture and pile fibers that are entwined with the ground threads constituting the ground texture and raised on the surface of the ground texture, and a step of subjecting the pile fabric to thermocompression bonding from the back side. including;
The pile fibers include poly(3-hydroxyalkanoate) fibers,
The ground yarn includes fibers having a higher softening point than the poly(3-hydroxyalkanoate)-based fibers,
The temperature conditions in the thermocompression bonding treatment are (1) above the softening point of the poly(3-hydroxyalkanoate)-based fiber and below the melting point of the poly(3-hydroxyalkanoate)-based fiber +10°C; and (2) The softening point is lower than the softening point of the fiber having a higher softening point than the poly(3-hydroxyalkanoate) fiber in the ground yarn,
If the polishing does not include the step of polishing the pile fibers that are raised on the surface of the ground structure, or if it includes the step of polishing the pile fibers that are raised on the surface of the ground structure, the polishing A method for producing a pile fabric, which is carried out at a temperature higher than the glass transition temperature of the poly(3-hydroxyalkanoate) fiber and lower than the softening point of the poly(3-hydroxyalkanoate) fiber by -40°C.
[11] The method for producing a pile fabric according to [10], which includes a step of polishing pile fibers raised on the surface of the ground texture.
[12] The method for producing a pile fabric according to [10] or [11], wherein the polishing is performed before the thermocompression bonding treatment and/or after the heat treatment compression bonding treatment.
[13] The pile fabric according to any one of [10] to [12], wherein the fibers having a higher softening point than the poly(3-hydroxyalkanoate) fibers contained in the ground yarn include biodegradable fibers. manufacturing method.
[14] The ground yarn further includes a heat-fusible fiber, and the softening point of the heat-fusible fiber is equal to or lower than the softening point of the poly(3-hydroxyalkanoate)-based fiber, [10] to [13] ] The method for producing a pile fabric according to any one of the above.
[15] The method for producing a pile fabric according to [13], wherein the ground yarn contains one or more fibers selected from the group consisting of cotton fibers, rayon, wool, and regenerated collagen fibers as biodegradable fibers.
[16] The method for producing a pile fabric according to [15], wherein the ground yarn further contains poly(3-hydroxyalkanoate) fibers as heat-fusible fibers.
[17] The method for producing a pile fabric according to [14], wherein the heat-fusible fibers include poly(3-hydroxyalkanoate) fibers.
[18] The method for producing a pile fabric according to any one of [10] to [17], which is a pile knitted fabric.

1, 19 Pile fabric 2 Ground thread 3 Pile part 4 Pile fiber 5 Fused part 6 Top of ground structure 7 Top of pile fiber 8 Distance (pile height)
9 Cutting edge of pile fiber 10 Processing device 11 Heating roll 12 Cooling rubber rolls 13, 14 Metal cooling roll 15 Guide rolls 16, 17 Container 18 Pile fabric raw fabric 18a Pile fabric raw fabric surface 18b Pile fabric raw fabric reverse side 21 Fabric of pile fabric Piece 22 Horizontal stand 31 Tangent line drawn to the tip of the fabric piece of pile fabric 41 Top of pile fiber 51 Distance (length of pile fiber)

Claims

A pile fabric comprising a ground weave and pile fibers that are entwined with ground yarns constituting the ground weave and are raised on the surface of the ground weave,
The pile fibers include poly(3-hydroxyalkanoate) fibers,
The ground yarn includes fibers having a higher softening point than the poly(3-hydroxyalkanoate)-based fibers,
Among the pile fibers entwined with the ground yarn, at least a portion of the poly(3-hydroxyalkanoate) fibers present on the back side of the ground yarn are fused,
When the pile fabric is heat treated in a dry heat atmosphere at 140° C. for 15 minutes without any load, the change rate of the length of the pile fibers before and after the heat treatment is 15.0 to 40.0%,
The pile fabric is characterized in that the bending rigidity of the base structure of the pile fabric is 1.00×10 −4 N·m 2 /m or less.
The pile fabric according to claim 1, wherein the fibers that have a higher softening point than the poly(3-hydroxyalkanoate) fibers contained in the ground yarn include biodegradable fibers.
The pile fabric according to claim 2, wherein the biodegradable fibers include one or more fibers selected from the group consisting of natural cellulose fibers, natural animal fibers, and regenerated cellulose fibers.
The pile according to claim 1 or 2, wherein the ground yarn further includes a heat-fusible fiber, and the softening point of the heat-fusible fiber is equal to or lower than the softening point of the poly(3-hydroxyalkanoate)-based fiber. fabric.
The pile fabric according to claim 2, wherein the ground yarn contains one or more fibers selected from the group consisting of cotton fibers, rayon, wool, and regenerated collagen fibers as biodegradable fibers.
The pile fabric according to claim 5, wherein the ground yarn further contains poly(3-hydroxyalkanoate) fibers as heat-fusible fibers.
The pile fabric according to claim 1 or 2, which is a pile knitted fabric.
The pile fabric according to claim 1 or 2, having a pile height of 8 mm or more.
A step of manufacturing a pile fabric including a ground weave and pile fibers entwined with the ground threads constituting the ground weave and raised on the surface of the ground weave, and a step of subjecting the pile fabric to thermocompression bonding from the back side,
The pile fibers include poly(3-hydroxyalkanoate) fibers,
The ground yarn includes fibers having a higher softening point than the poly(3-hydroxyalkanoate)-based fibers,
The temperature conditions in the thermocompression bonding treatment are (1) above the softening point of the poly(3-hydroxyalkanoate)-based fiber and below the melting point of the poly(3-hydroxyalkanoate)-based fiber +10°C; and (2) The softening point is lower than the softening point of the fiber having a higher softening point than the poly(3-hydroxyalkanoate) fiber in the ground yarn,
If the polishing does not include the step of polishing the pile fibers that are raised on the surface of the ground structure, or if it includes the step of polishing the pile fibers that are raised on the surface of the ground structure, the polishing A method for producing a pile fabric, which is carried out at a temperature higher than the glass transition temperature of the poly(3-hydroxyalkanoate) fiber and lower than the softening point of the poly(3-hydroxyalkanoate) fiber by -40°C.
The method for manufacturing a pile fabric according to claim 9, comprising a step of polishing pile fibers raised on the surface of the ground texture.
The method for manufacturing a pile fabric according to claim 9 or 10, wherein the polishing is performed before the thermocompression bonding treatment and/or after the heat treatment compression bonding treatment.
The method for producing a pile fabric according to claim 9 or 10, wherein the fibers having a higher softening point than the poly(3-hydroxyalkanoate)-based fibers contained in the ground yarn include biodegradable fibers.
The pile according to claim 9 or 10, wherein the ground yarn further includes a heat-fusible fiber, and the softening point of the heat-fusible fiber is equal to or lower than the softening point of the poly(3-hydroxyalkanoate)-based fiber. Fabric manufacturing method.
13. The method for manufacturing a pile fabric according to claim 12, wherein the ground yarn contains one or more fibers selected from the group consisting of cotton fibers, rayon, wool, and regenerated collagen fibers as biodegradable fibers.
15. The method for producing a pile fabric according to claim 14, wherein the ground yarn further contains poly(3-hydroxyalkanoate) fibers as heat-fusible fibers.
The method for producing a pile fabric according to claim 9 or 10, which is a pile knitted fabric.