JPH0545086U - Impregnated adhesive non-woven fabric - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an impregnated adhesive non-woven fabric having flame retardancy and being used in a friction part and having a large effect of preventing abnormal noise. [Structure] 80% by weight of flame-retardant polyclar fiber 2
As described above, the polypropylene fiber 3 is composed of 20% by weight,
And a random layered body (F) is formed from a fiber web (F) having an average fineness of less than 5d by an air flow type web former,
The random layered body (F) is bonded with an acrylic adhesive (B) at an F / B blending ratio of 65 to 80/20 to 35% by weight.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an impregnated adhesive non-woven fabric, and more particularly to an impregnated adhesive non-woven fabric having an excellent effect of preventing abnormal noise caused by friction between a seat frame and a cushion body in a vehicle seat or the like.

[0002]

[Prior Art]

 BACKGROUND ART Conventionally, a seat cushion of a vehicle seat, for example, in a spring seat in which an S-shaped spring is omitted, includes a metal seat frame formed in a box shape and a polyurethane foam layer placed on the top of the seat frame. The cushion body and the trim cover that covers the seat surface are integrally formed.

In recent years, such seat cushions are required to have flame retardant performance, and the back surface shape of the side support portions has become very complicated due to the spread of bucket type seats.

[0004]

[Problems to be solved by the device]

 In the vehicle seat having such a conventional structure, the back surface side of the cushion body is integrally impregnated with a reinforcing non-woven fabric to reinforce the contact portion with the seat frame. However, during the above impregnation molding, the foaming undiluted solution oozes out on the surface of the reinforced nonwoven fabric and hardens, and due to the movement of body pressure during sitting, the hardened reinforced nonwoven fabric such as the side support part rubs against the seat frame, causing an unpleasant friction noise (abnormal noise). There was a problem that occurs.

Therefore, for example, as proposed in Japanese Patent Laid-Open No. 62-277917, a soft non-woven fabric portion is formed at a contact portion between a cushion body and a seat frame by preventing exudation of a foaming undiluted solution into a reinforced non-woven fabric. And the frame are brought into contact with each other, or as proposed in Japanese Utility Model Application Laid-Open No. 1-150040, a noise canceling member made of a flexible material is sandwiched between the cushion body and the seat frame to generate abnormal noise. Measures such as prevention were taken.

However, in recent years, with the pursuit of improvement in the living environment of automobiles and the like, indoor noise is being further reduced, and there is a demand for further improvement in the above-mentioned noise generation prevention effect. It was

The inventors of the present invention have paid attention to the fact that the volume and timbre of the abnormal noise differ depending on the type (material composition) of the non-woven fabric used in the contact portion with the frame, and as a result of earnest study, the effect of preventing the abnormal noise is generated. I found an excellent non-woven fabric.

Therefore, an object of the present invention is to provide an impregnated adhesive non-woven fabric which is flame-retardant and has a large effect of preventing abnormal noise when it is used in a friction part.

[0009]

[Means for Solving the Problems]

 This invention was made in order to achieve the above-mentioned object. A fiber web (80% by weight or more of flame-retardant polychlorinated fiber, 20% by weight of polypropylene fiber) having an average fineness of less than 5d ( F) is formed into a random layered body (F) by an air flow type web former, and the random layered body (F) is mixed with an acrylic adhesive (B) in an F / B mixing ratio of 65 to 80/20 to 35% by weight. The impregnated adhesive non-woven fabric is characterized by being bonded at a ratio of.

[0010]

[Action]

 The present invention is configured as described above, and blends flame-retardant polyclar fiber and polypropylene fiber. Both fibers are non-aligned by an air flow type web former to form a random layered body, which is bonded with an acrylic adhesive with low film rigidity, and the friction resistance of the nonwoven fabric surface is made small by selecting a relatively fineness. Is forming.

As a result, it is sandwiched between two members that rub against each other, and the generation of abnormal noise that occurs during rubbing is prevented.

[0012]

[Description of configuration]

 The configuration of the present invention will be described below with reference to the drawings. In addition, in the following description, “%” indicating a mixing ratio means “% by weight” unless otherwise specified.

This impregnated adhesive non-woven fabric 1 (hereinafter abbreviated as non-woven fabric 1) comprises 80% or more of flame-retardant polypropylene fibers 2 and less than 20% of polypropylene fibers 3, and A fibrous web having an average fineness of less than 5d is formed into a random layered body F by an air flow type web former 14, and this random layered body F is mixed with an acrylic adhesive B in a F / B mixture ratio of 65 to 80/20 to 35%. It is formed by impregnating and adhering at a ratio of.

In the present invention, as the flame-retardant fiber, the residual crimp of the fiber after opening is lower than that of other flame-retardant fibers, and as a result, a fiber web having a smooth surface can be obtained. Is used. If the content of this polyclar fiber 2 is less than 80%, the flame retardancy will be reduced.

Further, as a result of various experiments on the combination with the above in order to promote the adhesion, adjust the texture, etc., polypropylene having a flame retardant tendency similar to that of Polyclar fiber 2 and exhibiting stable flame retardancy when combined Fiber is used. When the polypropylene fiber 3 is 20% or more, it becomes difficult to control the thickness, the sheet strength is lowered, and the flame retardant performance is deteriorated.

The average fineness of both fibers 2 and 3 is preferably less than 5d. When this is 5d or more, the fineness separation in the airflow type web warmer 14 is likely to be remarkable, a density gradient is generated in the thickness direction, and the nonwoven fabric 1 can have the front and back sides. By keeping this average fineness to be less than 5d, a nonwoven fabric 1 having low frictional resistance on both the front and back surfaces can be obtained. It is preferable that the difference in fineness between the fibers 2 and 3 is small.

In experiments with adhesives, acrylic adhesives are recommended because the adhesive film has low rigidity and good drapability can be obtained. If the F / B compounding ratio of this acrylic adhesive B is 20% or less, the adhesive performance will be reduced, and the friction resistance of the nonwoven fabric 1 will be large, and if it is 35% or more, the flame retardant performance and texture will be reduced. To do.

FIG. 2 shows an example of a production line for the nonwoven fabric 1. This manufacturing line is mainly equipped with a blender 11, a carding machine 12, a web forming machine 13, an air flow type web former 14, an impregnating device 15 and a dryer 16, and is installed in the order described above.

In the compounding machine 11, the polyclar fiber 2 and the polypropylene fiber 3 are mixed at a predetermined ratio. In the card machine 12, both fibers 2 and 3 are opened, and in the web forming machine 13, a fiber web is formed.

The air flow type web former 14 includes a cylinder for feeding the fiber web, an injection port for injecting an air jet to the fiber web on the cylinder, and a suction drum provided below the injection port. ing. In the air flow type web former 14, when the fiber web is separated from the cylinder by the action of the air jet, the individual short fibers are blown off and randomly blown onto the suction drum. At this time, the short fibers that fall down are promoted to be separated due to the difference in fineness and the difference in specific gravity, and the directionality of the fibers is negated to be non-aligned to form a random layered body F.

In the impregnation device 15, the random layered body F is dipped in an acrylic adhesive B so as to have a predetermined F / B blending ratio and impregnated and bonded. The dryer 16 heats and dries the random layered body impregnated with the adhesive and sucks it to adjust the thickness of the product. Thereby, the nonwoven fabric 1 is formed.

[0022]

【Example】

 Hereinafter, examples performed to confirm the effects of the present invention will be described.

Example 1 A compounding machine was prepared by mixing 90% of polyclar fiber having a fineness of 3d and a cut length of 51 mm with 10% of polypropylene fiber having a fineness of 6d and a cut length of 64 mm (this average fineness is 3.0d). A random layered body F having a basis weight of 70 g / m ² was formed through the carding machine 11, the card machine 12, the web forming machine 13, and the air flow type web former 14. Then, in the impregnation device 15, the acrylic adhesive B was impregnated and bonded to the random layered body F by the dipping method so that the F / B composition ratio was 70/30%. Then, it was dried with a dryer 16 at 130 ° C. for 15 minutes to obtain a nonwoven fabric.

Example 2 A mixture of 90% of polyclar fiber having a fineness of 3d and a cut length of 51 mm and 10% of polyclar fiber having a fineness of 6d and a cut length of 64 mm (average fineness of 3.0d) was used. A random layered body F having a basis weight of 80 g / m ² was formed in the same process as in 1. This random layered body F was impregnated with the acrylic adhesive B at a F / B compounding ratio of 75/25% in the same process as in Example 1, adhered and then dried to obtain a nonwoven fabric.

The following comparative examples were prepared in order to compare the properties of the non-woven fabrics of the above examples.

Comparative Example 1 A polyclar fiber having a fineness of 3d and a cut length of 51 mm was 70%, and a rayon fiber having a fineness of 3d and a cut length of 29 mm was 30% (average fineness of 3.0d). A nonwoven fabric was obtained in the same manner as in Example 1.

Comparative Example 2 A nonwoven fabric was obtained in the same manner as in Example 1, except that SBR type was used as the adhesive.

Comparative Example 3 Example in which 60% of modacrylic fiber having a fineness of 7 d and a cut length of 51 mm and having flame retardancy and 40% of polyester fiber having a fineness of 3 d and a cut length of 38 mm were mixed (average fineness 5.4 d). A random layered body F having a basis weight of 120 g / m ² was formed in the same process as in 1. A non-woven fabric was obtained by impregnating and adhering an SBR adhesive at a F / B compounding ratio of 80/20% in the same process as in Example 1.

Comparative Example 4 80% of flame-retardant acrylic fiber having a fineness of 5 d and a cut length of 51 mm and 20% of polyester fiber were blended (average fineness of 6.8 d), and the weight per unit area was the same as in Example 1. 80 g / m ² of a random layered body F was formed. A vinyl chloride / vinyl acetate copolymer-based adhesive was used for this, and a non-woven fabric was obtained by immersing and adhering it in a spray method at an F / B compounding ratio of 50/50%.

The nonwoven fabric produced in this manner was evaluated for the following items.

(1) Flame-retardant performance Tested based on the flame-retardant test of FMVSS No. 302, American automobile safety standard. Those that met the above criteria were rated as ◯.

(2) Average Friction Coefficient A test piece was prepared from each non-woven fabric, and the average friction coefficient of each side of the test piece was measured by a surface tester for textiles [KES-FB system manufactured by Kato Tech Co., Ltd.].

(3) Effect of Preventing Abnormal Noise The device was mounted on a vehicle seat 20 as shown in FIG. 3 and the volume and tone of abnormal noise generated by body pressure movement of a seated person (body weight of about 70 kg) was observed. The case where no abnormal noise was generated was rated as ◯, and the case where slight noise was generated was rated as Δ.

In FIG. 3, the vehicle seat 20 mainly includes a seat cushion 21 and a metal frame 25. The seat cushion 21 includes a trim cover 22 and a cushion body 23, and a back surface of the cushion body 23. The reinforcing non-woven fabric 24 is impregnated and molded. The seat cushion 21 is placed on the upper part of a frame 25 with the evaluation non-woven fabric 10 (each embodiment and comparative example) sandwiched therebetween.

The results are shown in Table 1. The smaller the average friction coefficient with respect to the generation of abnormal noise, the more effective is the prevention effect. As shown in the table, the effectiveness of about 0.30 or less manifests the effectiveness. I understand.

[0036]

[Table 1]

It was confirmed that the difference in the average friction coefficient between the front and back sides was smaller when the difference in the fineness of the blended fibers was smaller.

[0038]

[Effect of the device]

 As described above, the impregnated adhesive non-woven fabric of the present invention comprises a fiber web (F) having a flame-retardant polyclar fiber of 80% by weight or more and polypropylene fiber of 20% by weight, and an average fineness of less than 5d. ) Is formed into a random layered body (F) by an air stream type web former, and the random layered body (F) is mixed with an acrylic adhesive (B) in a F / B compounding ratio of 65 to 80/20 to 35% by weight. Since the structure is adhered by, it has flame retardancy and can exert a great effect in preventing abnormal noise.

Further, since it is possible to reduce the difference between the front surface and the back surface of the non-woven fabric, it is possible to use it without paying attention to the front surface and the back surface, and it is also effective for being used in a part where both surfaces rub against each other.

[Brief description of drawings]

FIG. 1 is a partially enlarged sectional view of an impregnated adhesive non-woven fabric according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing an example of a manufacturing line of the same.

FIG. 3 is a cross-sectional view illustrating a vehicle seat for evaluating the effect of preventing abnormal noise.

[Explanation of symbols]

 1 Impregnated adhesive non-woven fabric 2 Polyclar fiber 3 Polypropylene fiber B Acrylic adhesive

Claims (1)

[Scope of utility model registration request] 1. A flame-retardant polyclar fiber is composed of 80% by weight or more, and a polypropylene fiber is composed of 20% by weight,
And a fiber web (F) having an average fineness of less than 5 d is formed into a random layered body (F) by an air flow type web former, and the random layered body (F) is mixed with an acrylic adhesive (B) in an F / B mixing ratio. An impregnated adhesive non-woven fabric characterized by being bonded at a ratio of 65 to 80/20 to 35% by weight.