JPS5957734A - Cord fabric for reinforcing tire - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tire reinforcing fabric (hereinafter referred to as "nylon tire cord") whose warp yarns are all made of polyamide synthetic fibers and are treated with an adhesive. This nylon tire cord has excellent flatness.

Conventional nylon tire cord is superior to other tire cord materials such as rayon and polyester in terms of strength, heat resistance, adhesion, and fatigue resistance.

Normally, when nylon tire cord is treated with adhesive,
Tension heat set to reduce elongation and heat shrinkage. However, even nylon tire cords that have been set to such tension generally are not completely set and have inherent distortion.

Nylon tire cord with inherent distortion or
Rubberized items using this material are often stored in rolls. 2t nylon tire cords that are stored in rolls or rubberized are exposed to the air, The internal distortion due to moisture in the air gradually becomes apparent and contracts.This contraction occurs at both ends of the coil,
That is, since the warp yarns at the selvage are thicker than those at the center, a so-called selvage-hanging phenomenon occurs when the yarn is pulled out from the roll winding in the next step. Such ear-hanging phenomenon often occurs in rubberized tires, and when this occurs, it causes inconveniences such as congestion in the tire manufacturing process and loss due to disposal.

Conventionally, in order to prevent the above-mentioned selvedge-hanging phenomenon, a method has been adopted in which pre-shrinked warp threads are woven into the selvedges. As a method, for example, (1) a method of using low-shrinkage yarn in the selvage part and inserting a hollow thread (Li Agency Kosho 401
3362).

(2) A method in which only the yarn to be woven into the selvedge is supplied with a lower tension than the other parts.

(3) A method of using threads that are woven into the selvedges with more twists.

(4) A method in which only the threads to be woven into the selvedges are wound under low tension and freely contracted.

Method of using freely contracted material
555) etc. However, all of these methods have the following drawbacks.

In other words, methods (1) and (3) above not only fail to eliminate the selvedge hanging phenomenon, but also deteriorate the physical properties such as the strength, elongation at break, and fatigue resistance of the warp yarns in the center and selvedge portions of the nylon tire cord. make it uneven. In addition, it is difficult to obtain yarns with various shrinkage rates, and because only the number of twists of the yarns in the selvedge portions are changed, complicated measures such as separately operating a thread binding machine are required.

The force f removal in (2), (4), and (5) above is a means to promote free contraction of the yarn, but the contraction fat
It's around 05chi, so you can't expect much. Furthermore, if excessive moisture is attached to a yarn that has contracted sufficiently freely, the yarn will elongate by about 0.3%, which is the opposite of the purpose of shrinkage. Historically, 1) Even if a yarn with a small amount of shrinkage as described in u is used for the selvage part, the selvedge hanging phenomenon cannot be completely prevented. Specifically, the ear hanging phenomenon occurs after 6 months with rolled nylon tire cords, and after 1 week with rubberized tire cords.

In summary, in the conventional techniques for dealing with the ear hanging phenomenon, it is recognized that the cause of the ear hanging phenomenon is in the ear, and countermeasures are taken only for the ear. Moreover, it was not a fundamental solution to eliminate the ear hanging phenomenon.

The inventors investigated the basic cause and mechanism of the selvage phenomenon while considering the above-mentioned circumstances, and found that the selvage phenomenon is a manifestation of the inherent distortion between the central warp and the selvedge warp. This is caused by a loss of balance in the warp yarns, and as in the past, the movement of the warp threads in the center is completely ignored and countermeasures are taken only at the ears. It has been found that even if the situation is ignored, it cannot be substantially resolved. As a result of studies based on this knowledge, we found that by imparting specific physical properties not only to the ears but also to all the warp threads that make up the nylon tire cord, we have created a nylon tire that has extremely excellent flatness and does not cause the ear hanging phenomenon. It was discovered that the tire cord can be 14)

That is, the present invention provides a nylon tire cord (a) in which the nylon tire cord is made of polyamide synthetic fiber and the warp satisfies the following conditions (a) to (c):
i(=il (b) ri, δ() yoyo myo to/ 4
;;#; 1. (J 0 (cl 2.7 U =
i6/S However, ER, EO, S are 1 after adhesive treatment.
Characteristic values measured from warp yarns collected within hours, E and 'FJo&J- are both 2.68! It shows the elongation rate under load of i'/denier, E□, 24°C x 55mm RH.

Leave it under the white neck for 72 hours, measure after fc, size, EO
24°C x 55% RH, the elongation rate that can be measured after being left under 1F for 30 minutes, S is 24°C x 55% R
H represents the dimensional change rate after being left under its own weight for 6 days.

The present invention will be explained in detail below.

In the present invention, "nylon tire cord" refers to a tire-reinforcing fabric made of polyamide synthetic fibers, which is coated with an adhesive (generally, An aqueous dispersion ((
Hereinafter, it will be referred to as rRFLJ. ■ is used. ) and subjected to RFL O heat curing and tension heat cent. Furthermore, the nylon tire cord according to the present invention also has other F& properties generally required as a tire reinforcing material, such as strength, elongation at break, and dry heat shrinkage within normal ranges. . That is, the strength is 7.0 Fz4 or more, preferably 7.59/d or more; the elongation at break is 17.0% or more, preferably r, x 18. It is O1 or more.

Polyamide-based synthetic tsRJh refers to polyamide synthetic fibers represented by 6-nylon and 6-row nylon.

The feature of 24S1 of the present invention is the nylon tire cord ([
- The constituting warp threads are 7≦ER≦11. Preferably 8≦E
□≦10. If ER < 7, the tires are too tight, and when the tire force swells, the tire's edges become loose, resulting in uneven tire sizes. For the 'E 7cXER> 11, when running tests are performed using swollen tires, phenomena such as the tires growing and becoming harsher are observed.

The second feature is that A;
ER≦1. (10, preferably 0.83≦EO/E
It is to titrate that R≦1.00. Eo/ E, (
0.80, the manifested state of the ears and the center of the nylon tire cord is different, causing flatness defects such as ear hanging phenomenon, which causes troubles such as process congestion and loss due to disposal. .

The third feature is that such warp threads satisfy the formula 2,70≦EQ/S,
Preferably, 3.00≦EO/S is added by 1;1. If Eo/S > 2.70,
Even on the same nylon tire cord surface, the manifested state of the ear part and the center part are different, resulting in poor flatness such as ear hanging phenomenon, and loss due to process reluctance 7'r'6, I>5 rejection, etc. may cause trouble.

Furthermore, the fourth feature of the present invention is that all such warps have the first to third features described above.

For example, if only the warp threads of the selvedge have the first to third characteristics described above, the object hl of the present invention is read and used for the determined Ao, A, (1), (1)', as in the prior art. tO+4 is calculated from the formula, and S is calculated from the formula (2) using 'O+tI.

to −2X (Ao2+ L2) 2 ・
... (1) Yot, = 2 X (Le, +L) (υ′S
”” (to-4J/1oXIU(J ・-・・
(1) Next, we will use a method to cut the flatness by 14J.
After RFI, treatment, or heat treatment, it was wound up into a roll, rubberized using nylon tacoat, left indoors for one week, then pulled out and qualitatively evaluated.

Example 1 6-Nylon raw yarn (1260D/210f) 2 unspecified separate downward combustions (39 times/σ in the Z direction) were applied, the two were pulled together, and one person above (39 times/crn in the S direction) ) to create a 1260D/20 yarn. Next, this thread was used as a warp to weave a sudare fabric τ.

After immersing in this RIi'L, the first zone temperature is 150C, the tension is 1.3 kf/cord, and the time is 120.
seconds.

Second zone temperature 210C, tension 3.2 kf/cord,
Time 40 seconds, 3rd zone temperature 210℃, tension 2.0kf
/ code, R, FL under tension heat set condition for 40 seconds
Processed. Next, heat treatment was performed using heated air at a low tension of 50 Li/cord for a heat treatment time of 1 second, and at a temperature of 50°C to 2°C.
The entire heat treatment was carried out at 00°C, and then the tension was 10 (I
It was rolled up into a roll using Z/cord. Table 1 shows the physical properties of the warp obtained.

Furthermore, flatness was determined using this nylon tire cord.

Example 2 A sudare fabric ia: was woven in the same manner as in Example 1 using 6-low nylon yarn (1260D/210f).

After soaking this loose fabric in RFLK, the first zone temperature is 16
0C, tension 1.2 kg/cord, time 120 seconds, second
Zone temperature 250C, length force 2.8 ki/cord,
Time 40 seconds, 3rd zone Onsho 225 C, tension 1.9
k, iy/cord, time 40 seconds, and then treated under heat setting conditions, using a hot roll at low tension of 100 knots/cord, heat treatment temperature 150°C, heat treatment time 0.1~2 , 0 seconds, and the following measurements were made in the same manner as in Example.

Example 3 After weaving the same sudare fabric as in Example 1, all yarns were heated with infrared heat Q [4, 5
The heat treatment was performed under the conditions of a low tension of 0 g/cord, a temperature of 120° C., and a heat treatment time of 2 seconds. Below, Example 1
RFL treatment was performed in the same manner as above, and the flatness and uniformity of the buds were measured.

Comparative Example 1 A nylon tire cord was obtained in the same manner as in Example 1 except that the low mud tension treatment was not performed. Next, the cord physical properties of the warp yarns were measured and the flatness was determined. The results are shown in Table-1.

Comparative Example 2 A nylon tire cord was obtained in the same manner as in Example 2 except that the heat treatment under low tension was not performed. Next, the cord physical properties of the warp yarns were measured and the flatness was determined.

Result 'ff: Shown in Table-1.

Comparative Example 3 A sudare fabric similar to that in Example 1 was woven. However, only the 20 threads to be woven into the selvedge were woven using threads that had been wound twice at a low tension of 100 g/cord and freely contracted. Using this woven fabric, RFL treatment was carried out under the same conditions as in Example 1 to obtain a roll-shaped nylon tire cord. The physical properties of the warp yarns at the ears and center of this nylon tire cord were measured to determine the flatness. The results are shown in Table-1. The rest below.

[Brief explanation of drawings]

The drawing is an explanatory diagram of the method for measuring S. A1: Sample when fixed under initial load (length t.), B: Sample after being left for 6 days (after 71C, under initial load (response 1.), a, b2: Fixed point, ho: sample Naomo A, 17L business school after 25 days of hard work. Patent applicant: Asahi Kasei Industries, Ltd. Patent application agent: Akira Aoki, patent attorney, Kazuyuki Nishidate, patent attorney: 1) Yuki Male Patent Attorney Akira Yamaguchi Procedural Amendment (Spontaneous) IIs February 2, 1995 Commissioner of the Japan Patent Office Kazuo Wakasugi1, Indication of the case Showa 1.157 Patent Application No. 1674742, Name of the invention Tire reinforcement Relation to the case of the person making the amendment for use of sudare textiles 6 Patent applicant name (003) Asahi Kasei Kogyo Co., Ltd. 4, agent address ・TE 105 Tokyo, Minatoro Toranomon-chome 8-10-5
, Subject of amendment (1) Section 11 of “Scope of Claims” of Shimen 1 Ei 1.
4) (2) 1:8d6 of [Detailed 1:1 Explanation of Original Suli] of 4 Groups 1 City, Contents of Amendment (1) As per attached sheet (2) (a) Re J e'lll 4. F 8th
r-i 'n 1 2 row r Eo / 8
>2.7 DJ li' go/S <2.70
J and ↑ Sanno. (I:0 Statement week page 311 line 16 r1260
Correct D/2DJ to "lm1260I)/2". C → Akashi 1 Ka゛Page 12 Line 16 “250℃” is changed to “2
25℃”. Z Supplementary List of Attached Items Requested Scope 1 copy 2 Claims 7n All the warps constituting the agent-treated sudare fabric for tire reinforcement are made of polyamide-based synthetic fibers, and the warp threads However, a tire reinforcing tire and electric power that satisfy the following conditions (a) to (C). (a) 7'= El(, 411 (b) 0.804Eo/EI(word 1.00(C)2
．． 705E. /S However, DR + L o + S are the characteristic values measured from the warp taken within 1 hour after the adhesive treatment. also shows the elongation rate under a load of 2.68r/denier, and ERh
i Measured after being left for 72 hours under 24℃ x 55% RH1, and Eo is 24℃ x 55% RH1.
It represents the elongation rate measured after standing for 30 minutes under its own weight, and S represents the dimensional change rate when left under its own weight for 6 days at 24°C x 55% B.

Claims (1)

[Scope of Claims] All of the warp yarns constituting the adhesive-treated tire reinforcing fabric are made of polyamide synthetic fibers, and the warp yarns satisfy the following conditions (a) to (c). Sudare fabric for reinforcing tires. (a) 7≦ER≦11 (b) 0.80≦Eo / ER/ 1.00 (c
) 2.70≦EO/S However, ER, EO, and S are all characteristic values measured from warp yarns taken within 1 hour after adhesive treatment,
E.R. and E. Both indicate the elongation rate under a load of 2.6Fl/denier, and were measured after being left under their own weight for 72 hours at ERH 24°C x 55mm RH, 'IR:, Eo ij
24°C x 55% RH, represents the elongation rate measured after 30 minutes of release +tT under its own weight, S is 24°C x 55% RH
, represents the dimensional change rate when left under its own weight for 6 days.