Vehicular upholstery polypropyleneterephthalate fiber fabric and method for producing of fabric

1. A vehicular upholstery polypropyleneterephthalate fiber fabric,

comprising:

a raw tricot fabric which is knitted by using polypropyleneterephthalate-multifilament yarn, for the ground yarn and the pile yarn;

wherein the raw tricot fabric is transformed into a napped tricot pile fabric by raising the sinker loop of the pile yarn of the raw tricot fabric to form fluffs which are then sheared to form cut piles;

a polypropyleneterephthalate-textured multifilament yarn is used for the ground yarn; and

a polypropyleneterephthalate-non-textured multifilament yarn or a polypropyleneterephthalate-bulky textured multifilament yarn is used for the pile.

2. A vehicular upholstery polypropyleneterephthalate fiber fabric,

comprising:

a vehicular upholstery fabric is made from a raw tricot fabric which is knitted by using polypropyleneterephthalate-multifilament yarn for the ground yarn and the pile yarn;

wherein the raw tricot fabric is transformed into a napped tricot pile fabric by raising the sinker loop of the pile yarn of the raw tricot fabric to form fluffs which are then sheared to form cut piles; and

a polypropyleneterephthalate-core-in-sheath core conjugate fiber multifilament yarn composed of a core component-polyethyleneterephthalate and a sheath component-polypropyleneterephthalate whose conjugate fiber is from 65 to 75 (weight percent) is used for at least the ground yarn or the pile yarn.

3. A vehicular upholstery polypropyleneterephthalate fiber fabric,

comprising:

a raw tricot fabric which is knitted by using polypropyleneterephthalate-multifilament yarn, for the ground yarn and the pile yarn;

wherein the raw tricot fabric is transformed into a napped tricot pile fabric by raising the sinker loop of the pile yarn of the raw tricot fabric to form fluffs which are then sheared to form cut piles;

a polypropyleneterephthalate-non-textured multifilament yarn is used for the ground yarn; and

a polypropyleneterephthalate-textured multifilament twist yarn is used for the pile yarn.

4. A vehicular upholstery polypropyleneterephthalate fiber fabric according to claim 1 , wherein:

the single fiber fineness of the polypropylenetherephthalate-multifilament yarn is 0.5˜6.0 dtex;

the total finess of polypropyleneterephthalate-multifilament yarn is 30˜180 dtex;

the density of the wale of the vehicular upholstery polypropyleneterephthalate-fiber fabric is more than 30 W/25.4 mm;

the density of the course of the vehicular upholstery polypropyleneterephthalate-fiber fabric is more than 50 C/25.4 mm;

the density of the knit loop, which is defined by the product of the density of the wale and the density of the course, is 1800 to 2300 C×W/(25.4 mm) 2 ;

the basis weight of the vehicular upholstery polypropyleneterephthalate-fiber fabric has been set at more than 450 g/m 2 ; and

the degree of curling in the knitting width direction and in the knitting length direction are respectively less than 20.

5. A method for the production of vehicular upholstery fabric comprising the following steps:

knitting a raw tricot fabric by using a polypropyleneterephthalate-multifilament yarn, whose single fiber fineness is 0.5˜6.0 dtex and whose total fineness is 30˜180 dtex for the ground yarn and the pile yarn;

napping the sinker loop of the pile yarn of the raw tricot fabric to form fluffs;

transforming the raw tricot fabric into a napped tricot pile fabric by shearing the napped fluffs to form cut piles;

neatly spreading the napped tricot pile fabric;

heating the spreaded napped tricot pile fabric by straining in the knitting width direction but without straining in the knitting length direction, thus relieving a potential stress of the needle loop of the ground yarn stored during the knitting process;

heating the napped tricot pile fabric by the same straining process such that the density of the wale of the cut pile is more than 30 W/25.4 mm, the density of the course of the cut pile is more than 50 C/25.4 mm, and the density of the knit loop, which is defined by the product of the density of the wale of the cut pile and the density of the course of the cut pile, is from 1800 to 2300 C×W/(25.4 mm) 2 .

6. A vehicular upholstery polypropyleneterephthalate fiber fabric according to claim 2 , wherein:

the single fiber fineness of the polypropylenetherephthalate-multifilament yarn is 0.5˜6.0 dtex;

the total finess of polypropyleneterephthalate-multifilament yarn is 30˜180 dtex;

the density of the wale of the vehicular upholstery polypropyleneterephthalate-fiber fabric is more than 30 W/25.4 mm;

the density of the course of the vehicular upholstery polypropyleneterephthalate-fiber fabric is more than 50 C/25.4 mm;

the density of the knit loop, which is defined by the product of the density of the wale and the density of the course, is 1800 to 2300 C×W/(25.4 mm) 2 ;

the basis weight of the vehicular upholstery polypropyleneterephthalate-fiber fabric has been set at more than 450 g/m 2 ; and

the degree of curling in the knitting width direction and in the knitting length direction are respectively less than 20.

7. A vehicular upholstery polypropyleneterephthalate fiber fabric according to claim 3 , wherein:

the single fiber fineness of the polypropylenetherephthalate-multifilament yarn is 0.5˜6.0 dtex;

the total finess of polypropyleneterephthalate-multifilament yarn is 30˜180 dtex;

the density of the wale of the vehicular upholstery polypropyleneterephthalate-fiber fabric is more than 30 W/25.4 mm;

the density of the course of the vehicular upholstery polypropyleneterephthalate-fiber fabric is more than 50 C/25.4 mm;

the density of the knit loop, which is defined by the product of the density of the wale and the density of the course, is 1800 to 2300 C×W/(25.4 mm) 2 ;

the basis weight of the vehicular upholstery polypropyleneterephthalate-fiber fabric has been set at more than 450 g/m 2 ; and

the degree of curling in the knitting width direction and in the knitting length direction are respectively less than 20.