JPH11309063A - Primary base fabric for tufted carpet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the filming of the entire part of the surface of thermally compression bonded parts in spite of firmly thermally compression bonding and to obtain a primary base fabric having good mechanical properties by consisting the primary base fabric of composite long fibers having a surface area ratio at which low melting polymers occupy at fiber surfaces is within a prescribed range and forming the fabric of nonwoven fabric having many thermally compression bonded parts. SOLUTION: The composite long fibers consist of high melting polymers and the low melting polymers of >=20 deg.C in the difference in the m.p. from the former polymers. As a result, the low melting polymers are thermally adhered to each other and the high melting polymers maintain the fiber form without being affected by heat when the polymers are partially thermally compression bonded. The long fiber nonwoven fabric, which maintains the mechanical properties, such as form holdability and tensile strength, of the long fiber nonwoven fabric and have excellent flexibility is thus obtd. The cross-sectional form of the composite long fibers is such that both polymers are exposed on the fiber surfaces. The surface are ratio at which the low melting polymers occupy at the fiber surface is specified to 5 to 30%. Since the fabric maintains the form by having the many thermally compression bonded parts, the stress and tensile strength of the base fabric are improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a primary base fabric for tufted carpet which is thermocompression-bonded and a method for producing the same.

[0002]

2. Description of the Related Art Tufted carpets are generally subjected to a tufting process, that is, a process of driving pile yarn into a primary base fabric for tufted carpet by tufting, and then to a dyeing process, and further subjected to a backing process to form a tufted carpet. It is a target.

Conventionally, a woven fabric or a non-woven fabric has been used as a primary base fabric for tufted carpet. As the non-woven fabric, a non-woven fabric made of polyester filament, a thermoplastic polymer having a polyester as a core component and having a lower melting point than polyester is used. Non-woven fabrics composed of composite long fibers having a sheath component as a sheath component, and non-woven fabrics obtained by blending polyester fibers with synthetic fibers having a lower melting point than polyester are known.

[0004] Many of the long-fiber nonwoven fabrics used as such a primary base fabric for tufted carpet are generally obtained by a manufacturing method called a spunbond method. The continuous fiber spun from the spinning nozzle is drawn by suction using an air sucker or the like, and the continuous fiber web spread and deposited on the moving mesh is partially heated by an embossing roll or the like. It is obtained by a method of pressure bonding, a method of bonding constituent fibers with an adhesive or the like, or a method of stabilizing the form by combining these.

[0005]

However, when the nonwoven fabric whose form is stabilized by the above-mentioned partial thermocompression bonding or bonding with an adhesive is used as a primary base fabric for tufted carpet, the nonwoven fabric is used in the tufting step in the carpet processing step. However, there is a problem in that a delamination phenomenon in which the particles are separated into layers, and a problem in a process such as a widening in a drying process after the dyeing process occur.

[0006] In order to solve the above problem, it is important to improve the adhesive force between constituent fibers in the inner layer portion of the nonwoven web. It is conceivable to improve the adhesive strength by increasing the amount of the adhesive, but since the degree of freedom of the constituent fibers in the entire nonwoven fabric is lost, the long fibers are damaged by tufting needles during tufting, and as a result, the base fabric itself However, there is a problem in that the strength and the stress at the time of elongation are weakened, making it unusable for practical use.

In the case of a nonwoven fabric made of a core-sheath composite long fiber having a low-melting polymer disposed in a sheath portion, when the thermocompression bonding temperature and the linear pressure are increased in order to improve the adhesive force between constituent fibers, the entire circumference of the fiber surface is increased. The presence of the low melting point polymer causes the melted low melting point polymer to adhere to the embossing roll, significantly impairing operability, and impairing the flexibility and drapability of the obtained nonwoven fabric. In addition, the surface of the thermocompression bonding part has a tendency to be inferior in tear strength because it is in the form of a film by a molten low melting point polymer, and when a tuft needle pierces this part, not only a hole is opened in the pierced part, The peripheral portion of the needle hole is also torn, and the tufted pile yarn is likely to fall out of the base fabric, that is, so-called pile removal is apt to occur. On the other hand, in order not to fuse the constituent fibers too much,
When the thermocompression bonding temperature and the linear pressure are lowered, there is a problem that the adhesive strength between fibers is inferior. That is, since the range of conditions for obtaining a product having the desired adhesive strength between fibers is extremely narrow,
It is extremely difficult to set these conditions, and great care must be taken during thermocompression bonding.

[0008] Also in the mixed fiber nonwoven fabric, if the thermocompression bonding temperature or the linear pressure is increased for the purpose of improving the adhesive force between the constituent fibers, the same problem as the nonwoven fabric made of the core-sheath type composite filament occurs.

The present invention improves the adhesive strength between constituent fibers, enables easy thermocompression bonding without paying careful attention during thermocompression bonding, and the surface of the thermocompression bonded part is firmly thermocompression bonded. An object of the present invention is to provide a primary base fabric for tufted carpet which does not form a film, has good mechanical properties, and does not have a pile after tufting.

[0010]

Means for Solving the Problems The present inventors have made intensive studies to solve the above-mentioned problems, and as a result, have reached the present invention. That is, the present invention has a cross section in which the high melting point polymer and the low melting point polymer having a melting point difference of 20 ° C. or more are exposed on the fiber surface, and the low melting point polymer is on the fiber surface. The gist of the present invention is a primary base fabric for tufted carpet, which is made of a nonwoven fabric having a composite surface fiber occupying a surface area ratio of 5 to 30% and having a large number of thermocompression-bonded portions.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, a high melting polymer and a low melting polymer having a melting point difference of 20 ° C. or more in a cross section exposed on the surface of a fiber have a low melting polymer. Is a composite continuous fiber having a surface area ratio of 5 to 30% on the fiber surface.

[0012] The composite long fiber comprises a high melting point polymer and a low melting point polymer having a melting point difference of not less than 20 ° C. If the difference in melting point of the polymer is less than 20 ° C., not only the low-melting polymer but also the high-melting polymer is melted during the thermocompression treatment, and the thermocompression bonding part becomes a cured film, so that the tear strength is inferior. In addition, the tufted pile yarns fall off the base fabric, which is a cause of so-called pile loss, which is not preferable. By setting the difference in melting point between both polymers to 20 ° C. or more, when partially thermocompression-bonded, the low-melting polymers are thermally bonded to each other, and the high-melting polymers are not affected by heat and have a fiber form. , The mechanical properties such as shape retention and tensile strength of the long-fiber nonwoven fabric are maintained, and the long-fiber nonwoven fabric is excellent in flexibility. The thermocompression bonding part is a state in which the fibers are firmly joined together by melting or softening of the low melting point polymers, and the non-thermocompression bonding part is such that the low melting point polymer and the high melting point polymer are not affected by heat. This is a state in which a fiber structure is maintained and a space between fibers is provided.

The polymer constituting the composite long fiber may be a thermoplastic polymer having a fiber forming property.
Polyester polymers such as polyethylene terephthalate and polybutylene terephthalate; or acid components such as phthalic acid, isophthalic acid, sebacic acid and adipic acid, diethylene glycol, propylene glycol, and 2,2-bis (4-hydroxyethoxyphenyl) )
Polyolefin-based polymers such as polyethylene, polypropylene, and copolymerized polyester obtained by copolymerizing diol components such as propane, bisphenol A, and 1,4-butanediol; nylon 6, nylon 66, and nylon 61.
And polyamide polymers such as nylon 46 and polyvinyl alcohol polymers represented by vinylon.

The combination of the high-melting-point polymer / low-melting-point polymer may be any as long as it satisfies the above-mentioned melting point difference, and specifically includes polyester / polyolefin, polyester homopolymer / copolyester, polyamide / polyolefin, High melting point polyamide / Low melting point polyamide,
Polypropylene / polyethylene and the like. This combination may be appropriately selected from the above polymers, but from the viewpoint of heat stability, dimensional stability, and productivity, it is preferable that both polymers are compatible with each other, and polyethylene terephthalate / copolyester, A combination such as polypropylene / copolymerized polypropylene is preferred.

The cross section of the composite long fiber is such that both polymers are exposed on the fiber surface, and the surface area ratio of the low melting polymer to the fiber surface is 5 to 30%. When the surface area ratio of the low-melting polymer is less than 5%, the shape retention property and mechanical strength of the base fabric become poor. On the other hand, if it exceeds 30%, the contact area between the fibers becomes large, so that it is necessary to appropriately adjust the processing temperature in the thermocompression bonding step. Significantly impairs the performance. In addition, the surface of the thermocompression-bonded portion of the obtained base fabric is in the form of a film that is almost entirely covered by a low-melting polymer obtained by melting a high-melting polymer that maintains a fiber structure,
During tufting, if a tuft needle pierces such a thermocompression bonding area, the tuft needle is easily damaged, and not only a hole is pierced but also the periphery of the needle hole is torn, and the tufted pile yarn is cut. Is easy to come off from the base cloth.

FIG. 1 shows a specific example of a cross section of a composite long fiber.
To 4, but are not limited thereto, and known materials may be used. 1 and 2 show that both polymers are arranged radially. 3 and 4, one polymer is disposed at the center of the cross section, and the other polymer, which is a leaf, is disposed around the one polymer.

When the cross section is a multi-leaf cross section as shown in FIGS.
The number of leaves is preferably 2 to 4. In the case of one piece, when polymers having different viscosities are used as a combination of polymers, the uniformity of the formation of the long-fiber nonwoven fabric due to the occurrence of bending of the polymer flow immediately below the spinneret or the occurrence of crimp in the melt spinning process. Therefore, it is necessary to select a combination of polymers in consideration of the viscosity of the polymer. On the other hand, if the number of leaves is more than 4, depending on the composite ratio and viscosity of the polymer, after the thermocompression treatment, the polymer disposed in the center is substantially covered with the polymer of the leaf and pressed and substantially compressed. The shape becomes closer to the cross-sectional shape of the core-sheath composite form,
It is difficult to achieve the object of the present invention.

The weight ratio of the low-melting polymer / high-melting polymer constituting the composite filament is from 10/90 to 40/60.
When the ratio of the low-melting polymer is less than 10% by weight, the shape stability of the composite cross section is lacking. On the other hand, when the ratio exceeds 40% by weight, it becomes difficult to control the surface area ratio targeted by the present invention.

The single-filament fineness of the conjugate long fiber may be 2 denier or more, and the upper limit is not particularly limited, but may be up to about 20 denier. If the single yarn fineness is less than 2 denier, the obtained primary base fabric for tufted carpet is inferior in dimensional stability, and in the tufting process for carpeting, the rigidity of the fiber is inferior, so that the impact due to the tuft needle causes Fibers may be cut. In addition, the use of long fibers as constituent fibers is higher in mechanical strength and dimensional stability than non-woven fabrics made of short fibers,
This is because it is effective to achieve the object of the present invention.

The basis weight of the nonwoven fabric varies depending on the fineness of the single yarn fiber, but is appropriately selected within a range of 40 to 200 g / m ² depending on the use. If the basis weight is 40 g / m ² or less,
The number of long fibers constituting the long-fiber nonwoven fabric becomes thin, and the uniformity becomes poor.
If it exceeds / m ² , a sufficient amount of heat will not reach the inner layer of the long-fiber nonwoven fabric during thermocompression bonding, and thermocompression bonding will be insufficient, resulting in poor shape retention.

The primary base fabric for tufted carpet of the present invention has a large number of thermocompression-bonded portions. In this way, since the shape is maintained by having a large number of thermocompression bonding portions, the stress and tensile strength at the time of elongation of the base fabric are improved, and it can withstand the constant tension required in the continuous dyeing process, and the backing The rigidity that does not cause wrinkles in the process can be supplemented. In addition, the area other than the thermocompression-bonded portion is a material in which the constituent fibers are simply accumulated, so that when the tuft needle penetrates in the tuft process, the degree of freedom and the gap for preventing the tuft needle from piercing the fiber properly are reduced. Have.

The ratio of the total thermocompression bonding portion to the total area of the nonwoven fabric (compression bonding area ratio) is preferably in the range of 10 to 40%, particularly preferably 15 to 30%. Crimp area ratio is 10
%, The stress and the rigidity at the time of elongation that can withstand the continuous dyeing step and the backing step after the tufting step tend to be poor. On the other hand, if it exceeds 40%, the degree of freedom of the fiber in the non-thermocompression bonding portion decreases, so that many constituent fibers are damaged by the tuft needle during tufting, and the strength and stress of the base fabric tend to be weakened.

The area and arrangement density of one thermocompression bonding section may be appropriately selected, but the area of one thermocompression bonding section is 0.5 to 2 m.
m ² and the arrangement density may be about 10 to 40 pieces / cm ² . The shape of the thermocompression bonding portion may be selected as appropriate, such as a circle, a square, or a well.

Further, the nonwoven fabric may be subjected to a needle punch or a water entanglement treatment in advance to entangle the constituent fibers in the thickness direction. In the entangled nonwoven fabric, the constituent fibers are randomly entangled in each direction, and the constituent fibers are also entangled and integrated in the inner layer of the nonwoven fabric. Does not occur. Further, since the constituent fibers are physically entangled with each other, each of the constituent fibers has a degree of freedom enough to move to some extent. Therefore, in the tufting process, there is no possibility that the tufted needle directly pierces the fiber or the fiber is damaged by the penetration of the tufted needle.

Further, in order to improve the stress and tensile strength at the time of elongation of the primary base fabric for tile carpet of the present invention, the base fabric subjected to the thermocompression treatment is impregnated with a resin, and the contact points between the constituent fibers are bonded with the resin. You may. At this time, the resin impregnation amount (in terms of solid content adhesion amount) is preferably about 1 to 15% by weight. However, the amount is such that the fiber does not lose its flexibility in the tufting process. As a resin to be impregnated, as a binder resin,
A copolymer obtained by copolymerizing one or more monomers such as methyl acrylate, ethyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, acrylonitrile, and styrene at a desired molar ratio. It is preferred to employ Alternatively, a cross-linkable binder resin in which the copolymer is cross-linked by a cross-linking agent may be used. As a crosslinking agent, a melamine resin, a phenol resin, a formaldehyde resin, or the like can be used.

The nonwoven fabric composed of composite long fibers in the present invention can be efficiently produced by the following production method. The high-melting polymer and the low-melting polymer are separately melted and spun using a composite spinneret having a composite cross-sectional shape, and the yarn spun from the die is conventionally known as a side spray, an annular spray or the like. After being cooled by a cooling device, the web is taken up by a take-up means such as an air sucker or a roller, and is deposited on a screen having a mesh structure to form a composite continuous fiber web.
The take-off speed of the yarn after cooling varies depending on the polymer forming the composite continuous fiber, but is generally at least 3500 m / min, preferably at least 4000 m / min. The pick-up speed is
If it is 3500 m / min or less, the orientation of the polymer forming the single fiber yarn is insufficient, and a long-fiber nonwoven fabric having poor thermal stability is not preferred.

The composite continuous fiber web deposited on the screen is led to an apparatus in which an embossed roll having a carved convex portion and a flat surface roll form a pair, or an apparatus in which embossed rolls form a pair, The surface temperature of the roll is defined as (Tm) with respect to the melting point temperature (Tm) ° C. of the low melting point polymer.
-40) The temperature is set in the range of not lower than Tm and the temperature is lower than Tm ° C. The linear pressure between the rolls is selected in the range of 10 to 100 kg / cm. And

If a temperature equal to or higher than the melting point of the low-melting polymer is applied as the surface temperature of the roll, the melted low-melting polymer will fuse to the roll surface and hinder production. on the other hand,
If the temperature is lower than (Tm-40) ° C, the thermocompression bonding effect of the low melting point polymer cannot be exhibited.

According to the above method, both the high-melting-point polymer and the low-melting-point polymer are composed of composite long fibers having a cross-sectional shape partially exposed to the outer periphery of the fibers, and are joined by a large number of thermocompression-bonded parts, and form stability. Is obtained as a primary base fabric for tufted carpet made of a nonwoven fabric holding the following.

[0030]

The present invention will be described below in detail with reference to examples. In addition, the evaluation method of the primary base cloth for tufted carpet performed in the Example is shown below. (1) Melting point of polymer (° C.) The temperature giving the maximum value of the melting endothermic peak measured at a heating rate of 20 ° C./min using a DSC-2 type differential scanning calorimeter manufactured by Perkin Elmer Co., Ltd. ° C).

(2) Relative viscosity of polyester A mixed solvent of phenol and ethane tetrachloride in an equal weight ratio of 10
0.5 g of the sample was dissolved in 0 ml, and the measurement was carried out by a conventional method at a temperature of 20 ° C.

(3) Melt flow rate of polypropylene (g / 10 minutes) [hereinafter referred to as MFR. It was measured by the method described in ASTM D1238 (L).

(4) Basis weight (g / m ² ) A total of 10 pieces of 10 cm × 10 cm pieces were prepared from the sample in the standard condition, and after reaching equilibrium moisture, the weight (g) of each sample piece was obtained. Is weighed and the average value of the obtained values is defined as a unit area (m
² ) The weight was converted to the unit weight (g / m ² ).

(5) Tensile strength (kg / 5 cm width) and elongation (%) Ten test pieces having a width of 5 cm and a length of 20 cm were prepared, and a constant-speed elongation type tensile tester (manufactured by Toyo Baldwin Co., Ltd .:
Using Tensilon RTM-500), the grip distance is 10
cm and a tensile speed of 20 cm / min, and the average value of 10 sheets was defined as tensile strength (kg / 5 cm width). The average value of the ten elongations under the maximum load was defined as the elongation (%).

(6) Compression stiffness (g) Ten test pieces having a width (longitudinal direction) of 5 cm and a length (lateral direction) of 10 cm were prepared, and the test pieces were bent in the horizontal direction to form a cylindrical shape. The ends were joined to form a cylindrical sample. Toyo Baldwin Co., Ltd .: Using a Tensilon UTM-4-100, a cylindrical sample was compressed in the vertical direction at a compression speed of 5 cm / min, and the stress (g) at the maximum load was measured. The value was taken as the compression bristles (g). The smaller this value, the better the flexibility.

Example 1 A high melting point polymer having a melting point of 160 ° C. and an MFR of 50 g / 1
0 min polypropylene, melting point 138 as low melting polymer
A copolymerized polypropylene having a CFR of 30 g / 10 minutes and a random copolymerization of propylene with 4% by weight of ethylene was prepared. These polymers were prepared using a known melt composite spinning machine, using a die having a composite cross section as shown in FIG. 1, a spinning temperature of 230 ° C., a single hole discharge rate of 1.4 g / min, and a surface area ratio of the low melting polymer. Was 8%. After cooling the yarn spun from the spinneret, the yarn is drawn by air soccer at a speed of 4200 m / min, opened by a known method, collected and deposited on a moving collecting surface to form a long fiber web. . This long fiber web was subjected to thermocompression bonding to obtain a long fiber nonwoven fabric with a basis weight of 50 g / m ² . When applying the thermocompression bonding, an embossing roll having a compression area ratio of 15% and hexagonal points arranged at an arrangement density of 18 pieces / cm ² and a flat roll were used, and the surface temperature of both rolls was set to 135 ° C. . The single filament denier of the composite filament obtained from the filament web deposited on the collecting surface was 3 denier.

Example 2 The procedure of Example 2 was repeated except that spinning was performed at a composite ratio such that the single hole discharge rate was 1.33 g / min and the surface area ratio of the low melting point polymer was 30%, and the polymer was taken out by air football at a speed of 4000 m / min. A long-fiber nonwoven fabric was obtained in the same manner as in Example 1.

Example 3 Except for using a die having a composite cross section as shown in FIG.
In the same manner as in Example 1, a long-fiber nonwoven fabric was obtained.

Example 4 Except for using a die having a composite cross section as shown in FIG.
In the same manner as in Example 1, a long-fiber nonwoven fabric was obtained.

Example 5 As a high melting point polymer, the melting point was 260 ° C. and the relative viscosity was 1.38.
As polyethylene terephthalate, a low melting polymer,
A copolymerized polyester having a melting point of 215 ° C. and a relative viscosity of 1.35 prepared by copolymerizing ethylene terephthalate with 15% by mole of isophthalic acid was prepared.
At a speed of 4800 m / min, and then the thermocompression bonding conditions were the same as in Example 1 except that the surface temperature of the roll was 200 ° C. A long-fiber nonwoven fabric was obtained.

COMPARATIVE EXAMPLE 1 A composite ratio was set so that the surface area ratio of the low-melting-point polymer was 50%, spinning was performed at a single-hole discharge rate of 1.2 g / min, and the polymer was taken out at a speed of 3600 m / min by air sucker.
In the same manner as in Example 1, a long-fiber nonwoven fabric was obtained.

COMPARATIVE EXAMPLE 2 A core-in-sheath composite cross section was formed, and the single hole discharge amount was 1.47 g.
/ Min, spinning speed 4400 by air soccer
A long-fiber nonwoven fabric was obtained in the same manner as in Example 1 except that the fiber was taken out at m / min.

The obtained long-fiber nonwoven fabrics of Examples 1 to 5 and Comparative Examples 1 and 2 were used as a primary base fabric for tufted carpet by a tuft testing machine with a tuft width of 30 cm, 98 tuft needles, and a gauge of 8 / inch. Tufting was performed with a loop length of 6 mm using nylon tuft yarn under the condition of 8 stitches / inch. Next, the tuft yarn was removed from the tufted primary base fabric for tile carpet, and the tensile strength (kg / 5 cm width) of the base fabric after tufting was measured. Then, the strong retention rate (%) was calculated by the following equation.

Strength retention (%) = (tensile strength of base fabric after tuft / tensile strength of base fabric before tuft) × 100 In the present invention, the tensile strength of the base fabric after removing the pile yarn is:
The one that retains the tensile strength of 50% or more of the tensile strength of the base cloth before tufting can not only fix the pile yarn tufted to the base cloth efficiently but also maintain the shape as a carpet together with the pile yarn. It has good shape retention even in the dyeing step and the backing step after tufting.

Table 1 shows the physical properties and the tuft retention of the obtained primary base fabric for tile carpet.

[0046]

[Table 1]

As is clear from Table 1, the primary base fabrics for tufted carpets of Examples 1 to 5 of the present invention are excellent in tensile strength and also maintain tensile strength after removal of pile yarn after tufting. It not only efficiently fixes the pile tufted to the base fabric, but also contributes to the shape retention as a carpet together with the pile yarn, and has good shape retention in the dyeing process after tufting, backing process, etc. Was something.

On the other hand, the primary base cloth for tufted carpet of Comparative Examples 1 and 2 has a large amount of the low melting point polymer occupying the fiber surface, so that the surface of the thermocompression-bonded portion is formed into a film by the molten low melting point polymer. The adhesion by thermocompression bonding was strong and the strength before tufting was excellent. However, after the tufting, the pile yarn is easy to come off, and the base fabric from which the pile yarn has been removed is not one having a round needle hole like the base fabric of the example, and the periphery of the needle hole is also torn. It had a low strength retention and was easily torn when pulled by hand.

[0049]

According to the present invention, a high melting point polymer and a low melting point polymer having a melting point difference of 20 ° C. or more from the polymer have a cross-sectional shape exposed on the fiber surface, and the low melting point polymer occupies the fiber surface. Since it is made of a nonwoven fabric having a composite surface fiber having a surface area ratio of 5 to 30% and having a large number of thermocompression-bonded portions, constituent fibers are fused to each other by a molten low-melting-point polymer in the thermocompression-bonded portion. However, the surface of the thermocompression-bonded portion is not completely formed into a film because the high-melting polymer maintaining the fiber structure is present on the fiber surface. Therefore, when the tuft needle is pierced into the thermocompression-bonded portion, a needle hole is opened only in the pierced portion, the peripheral portion is not torn, the pile is hardly removed, and the shape retention is maintained.

Further, the low-melting-point polymer serving as an adhesive between the constituent fibers occupies a specific area on the fiber surface and has a specific cross-sectional area. Therefore, the composition can be obtained without paying careful attention during thermocompression bonding. The fibers can be easily bonded to each other.
A primary backing for tufted carpet having good mechanical properties is obtained.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an example of a cross section of a composite long fiber used in the present invention.

FIG. 2 is a schematic view showing an example of a cross section of a conjugate long fiber used in the present invention.

FIG. 3 is a schematic view showing an example of a cross section of a composite long fiber used in the present invention.

FIG. 4 is a schematic view showing an example of a cross section of a composite long fiber used in the present invention.

 ──────────────────────────────────────────────────の Continued from the front page (72) Inventor Tatsu Takahashi 4-1 Hina Kitamachi, Okazaki City, Aichi Prefecture Unitika Okazaki Plant

Claims (2)

[Claims] 1. A high-melting polymer and a low-melting polymer having a melting point difference of 20 ° C. or more between the high-melting polymer and the low-melting polymer occupy the fiber surface. A primary base fabric for tufted carpet, comprising a composite long fiber having a surface area ratio of 5 to 30% and a nonwoven fabric having a large number of thermocompression-bonded portions. 2. The primary base fabric for tufted carpet according to claim 1, wherein the nonwoven fabric is a needle punched nonwoven fabric in which constituent fibers are entangled with each other.