JPH0286681A - Production of friction base material - Google Patents

Abstract

PURPOSE:To obtain the title material improved in the uniformity of a composition and the yield by doubling single yarns each obtained by twisting a sliver formed by subjecting a plurality of organic fibers to a specified treatment together with a long inorganic fiber and/or a metal wire into a cord. CONSTITUTION:A cotton cluster is obtained by simultaneously opening and blending a plurality of organic fibers (e.g., rayon and aromatic polyamide fiber) in a cotton blending step. A short inorganic fiber and/or an inorganic filler powder (e.g., short glass fiber) is fed to the cotton cluster in a carding step and carded to obtain a sliver. A single yarn is formed by twisting this sliver together with a long inorganic fiber and/or a metal wire (e.g., long glass fiber) in a twisting step. Such single yarns are twisted in a doubling step to obtain a cord-like friction base material.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method for manufacturing a string-like friction base material.

A friction material formed using a friction base material manufactured by the manufacturing method of the present invention has a uniform material composition and has improved friction performance, burst strength, and the like.

[Conventional technology] Conventionally, 11 fibers, inorganic fibers, J! ? ! 1 is formed by impregnating and soaking a thermosetting resin into a string-like II friction base material formed from a thermosetting agent, an inorganic filler, etc., and rolling it into a disk shape and thermoforming it.
1m +4 is often used. The string-like 111 used here! Spinning technology has conventionally been applied as a method for producing rubbing base materials. In other words, for example,
As disclosed in Publication No. 9526, chopped strands of glass fiber, short carbon fibers, short staple fibers, etc. were mixed, and this was supplied to a card for carding. The final sliver is then twisted to form a single yarn. Then, if necessary, twist it with metal wire, glass fiber, etc. to make a string-like material.
! ! This is a method of forming a base.

By the way, in the cotton blending process, a large shearing force acts on the fibers. Therefore, if highly rigid fibers such as glass AM 49 and rock wool are mixed, the fibers may break or be damaged. In addition, when inorganic filler powder such as barium sulfate or calcium carbonate is mixed with fiber in I1.1, the powder material falls or scatters due to the difference in specific gravity, reducing the yield and being discharged from I1.1. The composition of the cotton tassels is uneven and the size is small. Due to these causes, there is a problem in that the performance of the friction material, which is the final product, varies in terms of JF friction performance, burst strength, etc.

[Problems to be solved by the invention] The present invention has been made in view of the above circumstances, and aims to improve the yield by making the composition of the polishing 1!2 base material uniform by adjusting the supply timing of each material. This is a technical issue.

[Means for Solving the Problems] The present inventors reexamined each spinning process from the viewpoint of manufacturing a special friction base material. As a result, they discovered that while a cotton blending process is required when mixing organic fibers, short fibers such as Chop Toss 1 to Rand can be mixed almost uniformly just by carding with a carding machine, and the present invention was completed. This is what I did.

That is, the method for producing a friction base material of the present invention mainly includes a cotton blending step in which a plurality of organic fibers are opened and mixed, and at least a cotton tuft surface after the cotton tuft is coated with at least densified dark blue short fibers and an inorganic filler powder. A carding process in which one side is supplied and then carded to form a sliver, a twisting process in which a long fiber of inorganic fiber, 13 and a metal wire are twisted together and the sliver is twisted together to form a single yarn; It is characterized by sequentially performing a thread-plying step of forming a string-like friction base material from single threads.

The cotton blending process is a process in which cotton is opened and mixed into cotton tassels, such as young number IA polyamide cardstock, rayon, cotton wool, and Kotsu 1hen. Ij synthetic fibers are highly flexible, so they do not break even when shearing force is applied during the cotton blending process, and are uniformly mixed in the form of long fibers.

Incidentally, even inorganic fibers can be blended with organic fibers at the same time as long as they are highly flexible and do not break during the blending process, such as steel wool.

The Δ carding step, which is a feature of the present invention, is a step in which at least one of yJj fibers of inorganic fibers and inorganic filler powder is supplied to the surface of the cotton tassel after the cotton mixing step, and then carding is performed to form a sliver. As inorganic fibers, glass J)I
Iff, rock wool, carbon IBIEII, pyramid 411IIt, etc. can be used.

In addition, as fillers, barium sulfate, calcium carbonate, magnesium carbonate, diatomaceous earth, dolomite 1~,
Calcium hydroxide etc. can be used. Then, at least one of the short fibers of these fibers and the inorganic filler powder is supplied to the cotton tassel for cadding. This supply is carried out, for example, by shaking the cotton tassel on the surface. By carding, a small amount of short fibers and powder (one of which is combed into the cotton tassel and mixed with the other). No large shearing force is applied to this short fiber, and there is no air. Since there is almost no convection, breakage and scattering of short fibers is prevented.In addition, reduction in yield due to powder material falling and scattering is prevented, and it can be combed uniformly into the cotton tassel.

It is then strung together to form a sliver.

When supplying both short fibers and powder material, the powder material may be supplied at the same time as the short fibers, but if these materials are stored together in a hopper or the like before being supplied, the difference in specific gravity may cause There may be variations in the composition supplied to the cotton tassel surface. Therefore, it is desirable to supply the powder material separately from the short fibers.

The twisting step is a step of twisting at least one of the inorganic fibers, the inorganic fibers, and the metal wire, and the sliver to form the medium thread, and can be performed in the same manner as in the past. Nothing is
As the nut, glass mmE, rock wool, etc. can be used, and as the metal wire, brass wire, copper wire, aluminum wire, button wire, 114 wire, stainless steel wire, etc. can be used. The combination of the sliver and these &4) & miscellaneous and metal wires can be selected depending on the purpose.

The yarn-plying process is a process in which a plurality of these single yarns are twisted together to form a string-like abrasive material, and can be performed in the same manner as in the past.

The obtained Iγ friction base (Δ is)] is impregnated with a thermosetting resin such as a norlic resin or a melamine resin, and after being wound into a predetermined disc shape, it is placed in a mold and thermoformed. ! It is considered to be a rubbing material.

[Operations and Effects of the Invention] In the manufacturing method of the friction base material of the present invention, in the cotton blending process, the cotton strands (IJ, silk IJ, and navy blue are mainly blended. Therefore, the cotton tassels output from the cotton blending machine are uniform. The composition is as follows. Then, in the carding process, short fibers of unmono fibers and at least one of inorganic powder are supplied, and then carded. When the short fibers are supplied in the carding process, the force acting on the short fibers is smaller than the force acting on the cotton during blending, thereby preventing the short fibers from breaking and scattering the short fibers. In addition, if the non-woven filler powder is supplied in the carding process, variations in specific gravity can be prevented, resulting in uniform mixing, and a decrease in yield due to falling, flying, etc. can be prevented.

Therefore, according to the method for producing a friction base material of the present invention, breakage of short fibers is prevented, yield is improved, and the composition of the I?
Rubbing 3J material can be '1lIIA'. Furthermore, materials that could not be added in the past due to their tendency to break can be used, increasing the degree of freedom in design. And 1;1 got 1? (The friction material formed from Ryo Motogetsu has a uniform composition, so it has excellent friction properties, and since it has no cracks in the short sanding, it has a strength of Perth 1~1.

[Example 1] Hereinafter, an example will be specifically described with reference to the drawings.

(Example 1) (1) Rayon blending process (Fuji I/I Sou) 30 hands F? i part and 'A f
i B polyamide fiber (“Kevlar” DuPont Company ￥J
) A 10-width hanging part is put into the mixer MI machine 1, and the cotton rA100 obtained is fed into the mixer MI machine 1 for 5 to 10 minutes, and the obtained cotton rA100 is discharged into a hopper 12J: in the form of a rice cake.

(2) Carding process A hopper 3 is arranged above the sheet-like cotton tuft 100,
Into the hopper 3 is placed a glass short tJJi navy blue 101 made of chopped strands of glass fiber (manufactured by Nippon Sheet Glass) with a length of 14 x 10 to 3 Qcm.

This short glass fiber 101G has a cotton tuft of ゛100Φ on the surface of a sheet-like cotton tuft 100 that is being conveyed in one direction.
The short glass fibers 101 are fed to the hanging part in such a way that the short glass fibers 101 are stretched 11 times per fork so that the length of the glass fibers 101 becomes the hanging part. The cotton tassel 100 having the glass knowledge Iff 101 is transported to the carding machine 4 and carded, after which cashew das 1 is sprinkled with 1 as a chafing agent, l, not shown,
The sliver is cut into a constant width using a 7Il17i machine. In this sliver, glass 4J is used during carding.
liff101 fell slightly, yield rate < it c
The ratio of actual booths to one hanger on i) was 97%.

(3) Twisting process (51 twisted slivers and long glass fibers (Japanese sheet glass)
! A) is twisted together to make raw silk. In J3, the mixing ratio of sliver and long glass fibers is 3:1 in terms of weight pressure.

(4) Tie thread eIl Arrange the three fi threads made in (!1) above and twist them together.
A string-shaped 12-segment base shrine.

(5) The material subjected to the test was impregnated with 201 a% of melamine-modified phenol resin, rolled into a predetermined disc shape, and thermoformed in a mold to form a friction material. did.

This 1γ drifting stone was installed on a full size Kuisamo test machine, and the inertia +, 0.2kgm52.11 combined rotation a180Or
pm, operating at 300°C with 2000 joints, and measuring the initial friction relationship, stable thickness and thickness coefficient, double-sided volumetric wear' = $d3, and burst strength, and the results are shown in Table 1. Shown in J.

(Example 2) 100 ir of cotton tassels in the carding process! , 25 parts of heavy oil and 25,000 parts of barium sulfate powder are glass short fibers and 25,000 parts of barium sulfate powder based on En part J: Example 1 except that sea urchins were fed at the same time.
Similarly to I? A rubbing base material was manufactured. Note that the yield rate of the sliver was 95%. And as in Example 1, IrP
A test material was formed and tested in the same manner, and the results are shown in Table 1.

(Example 3) Same as Example 1, except that in the carding process, short glass fibers were fed at the same time so that 25 parts by weight and 25 parts by weight of diatomaceous powder were fed to 100 parts by weight of cotton. A 1f rubbing base material was produced. Note that the yield rate of the sliver was 93%. A friction material was then formed in the same manner as in Example 1, and tested in the same manner as in Example 1, with the results shown in Table 1.

(Examples 4 to 6) Friction bases were manufactured by supplying barium sulfate and/or diatomaceous earth with Iu shown in Table 1 to the cotton tassel during the carding process without using short glass fibers. As in Example 1, each IIt! A rubbing material was formed and tested in the same manner, and the results are shown in Table 1.

(Comparative Example 1) 30 parts by weight of rayon and aromatic polyamide fiber N were used in the cotton blending process.
10 parts by weight and 20 parts by weight of short glass fibers were mixed, and nothing was supplied in the carding process and only carding was performed.
? A rubbing base material was manufactured. In this case, the yield rate of the sliver was 84%, and the loss of glass y and 0 fibers was large.

A friction material was formed in the same manner as in Example 1 and tested in the same manner, and the results are shown in Table 1.

(Comparative Example 2) Hz E4 material was mixed with T in the same manner as in Comparative Example 1, except that barium sulfate was mixed with lJ fiber in the hanging shown in Table 1 in the cotton blending process without using the glass short shoulder T. ! lJ
Built. And 1 like implementation 1ri 11? A rubbing material was formed and tested in the same manner, and the results are shown in Table 1.

(Evaluation) From Table 1, it can be seen that the sliver with 1!1 in the comparative example has a low rate of 9 (84% and 75%), while the sliver in the example has a low rate of 9
It shows a high level of over 2%. Further, when comparing Example 1 and Comparative Example 1, the friction material formed in Example 1 has a smaller wear rate. This is probably due to the small loss of short glass fibers and the small number of breaks. Further, when comparing Example 4 and Comparative Example 2, the friction material formed in Example 1 has less wear particles and a larger Perth 1 to Strong Iσ. This is probably due to the fact that the loss of barium sulfate is small and the composition of the friction material is uniform.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an 8i cotton culm and an apparatus for carrying out a carding process in a manufacturing method according to an embodiment of the present invention. 1... Blend cotton tilt 2... Hopper machine 3.
... Hopper 4... Karji) Number 100... Cotton 1 sword 101... Glasson, υ fiber zero city special i:'l
Applicant Aisin Kako Co., Ltd. Agent Patent Attorney
Hiroshi Okawa

Claims (1)

[Claims] (1) A cotton blending process in which a plurality of organic fibers are mainly opened and mixed, and at least one of short inorganic fibers and inorganic filler powder is supplied to the surface of the cotton tassel after the cotton blending process, and then carding is performed. a carding process to form a sliver, a twisting process to form a single yarn by twisting the sliver with at least one of long fibers of inorganic fibers and metal wire, and forming a string-like friction base material from a plurality of the single yarns. A method for manufacturing a friction base material, characterized by sequentially performing a yarn doubling process.