JPH07189045A - Metallic wire for doffer - Google Patents

Abstract

PURPOSE:To provide a metallic wire for a doffer capable of spinning a web of high quality even in a high speed, high productive spinning especially of a manufacturing process for producing nonwoven cloth and free from winding of a web around the roller even in a roller doffing since a back angle surface is formed in a circular arc-shape and accordingly the length of the time in which the metallic wire works on the scraping roller is long. CONSTITUTION:This is a metallic wire for a doffer used in combination with a metallic wire for a cylinder in which an operating angle X is 75-85 deg. and the depth B of a tooth is 0.5-2.0mm. In that metallic wire, an operating angle X is 45-70 deg., the depth B of a tooth is 1.5-3.0mm, the upper part of the operating angle of the tooth is connected to a straight line via a mildly upward-protruding curve and the upper part of the back angle is connected to a straight line whose inclination angle is smaller than that of the operating angle via a mildly upward-protruding curve. The tooth of the metallic wire is strong and hardly getting damage and accordingly the metallic wire enables to keep excellent spinning for a long time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metallic wire used for a roller card in a nonwoven fabric manufacturing process.

[0002]

2. Description of the Related Art In recent years, roller cards have been used mainly in the process of manufacturing nonwoven fabrics to perform a fiber-spreading operation, aiming at high speed and high productivity. Conventionally, in this high-speed, high-production roller card, a cylinder metallic wire as shown in FIG. 9 and a doffer metallic wire as shown in FIG. 10 have been used to increase the production amount.

[0003]

However, the production amount is 50%.
In the high production area of more than kg / hr (card width of 2000 mm), there is a problem that the fiber density per unit area on the cylinder surface increases, the fibers are not sufficiently opened, and the nep in the web increases. .

Further, at the time of roller doffing from the doffer, the doffing was not sufficient at high speed spinning, and the web was rolled up. Furthermore, there is also a method of reducing the working angle of the doffer for the purpose of increasing the transition from the cylinder to the doffer and increasing the production, but in this case the tooth strength of the wire is weak, so the doffer wire is damaged quickly,
There is a problem that the life is shortened.

[0005]

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned problems. The working angle X is 75 ° to 85 ° and the tooth depth B is 0.
A metallic wire for a doffer used in combination with a metallic wire for a cylinder of 5 to 2.0 mm, wherein the working angle X is 45 ° to 70 °, the tooth depth B is 1.5 to 3.0 mm, and the working angle of the tooth portion is The surface shifts to the straight part with a gentle curved surface that is upward from the top, and the dorsal surface is a gentle curved surface that is upward from the top.
It is a metallic wire for a doffer formed by shifting to a straight line portion having a smaller inclination angle than the working angle surface, and the curved surface position of the working angle surface and the curved surface position of the dorsal corner surface have a tooth depth B from the tooth tip. The radius R ₁ of the curved surface of the working surface is 0.1 ^{R to} 4.2 ^R , and the radius R ₂ of the curved surface of the back surface is R ₁ to 8 ^R. .4 ^R formed.

If the working angle of the metallic wire for the cylinder is less than 75 °, the winding of the fiber occurs in the cylinder,
If it exceeds 85 °, the spreadability will be deteriorated. Also, the tooth depth B is
If it is less than 0.5 mm, the opening action is reduced and the production amount is reduced, and if it exceeds 2.0 mm, the fibers are wound around the cylinder wire. The working angle X of the metallic wire for doffer is suitably 45 ° to 70 °. If it is less than 45 °, the tooth strength decreases, and if it exceeds 70 °, the transfer rate from the cylinder to the doffer decreases and the sliver quality deteriorates. To do. A tooth depth B of 1.5 to 3.0 mm is suitable. If it is less than 1.5 mm, the transfer rate is lowered and the sliver quality is deteriorated. Becomes worse.

Further, when the positions of the curved surfaces of the working angle surface and the back angle surface exceed 60%, the transfer rate becomes large, cloudy occurs, and the cotton spread becomes worse. Also, the radius R ₁ of the arc of the working angle surface is suitably 0.1 ^{R to} 4.2 ^R ,
Punching to less than ^R is difficult, and if it exceeds 4.2 ^R , the transition does not become large. Furthermore, the radius R ₂ of the arc of the dorsal surface is
0.1 ^{R to} 8.4 ^R is suitable, and it is difficult to punch to less than 0.1 ^R, and if it exceeds 8.4 ^R , the cotton spread becomes poor.

[0008]

Since the metallic wire of the present invention has the above-mentioned constitution, the fiber-spreading action in the roller card is improved, and good web quality can be obtained even in the high speed high production spinning of 50 kg / h or more in the non-woven fabric manufacturing process. it can. Also, in roller doffing, the dorsal surface is formed by an arc, so the action time with the stripping roller is long, the web does not wind up, and the metallic wire for doffer has high tooth strength and no damage However, good spinning can be maintained for a long time.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 and 2 show a metallic wire for doffer of the present invention, which has a tooth height of A4.0 mm, a tooth depth of B2.1 mm and a thickness of C.
0.95 mm, addendum thickness E 0.15 mm, addendum thickness F 0.5 mm, addendum length G 0.10 mm, working angle X 60 °, working angle surface arc radius R
₁ 2.2mm, back angle Y 38 °, back surface radius of arc R ₂ 4.4m
m, number of threads M12, 25.4 mm, number of needles P321 / 25.4 m
It is formed by forming m ² . It is also possible to form a short straight line portion on the uppermost part of the working angle surface and the back angle surface of the doffer metallic wire. The cylinder metallic wire used in combination with the doffer metallic wire of the present invention, as shown in FIG. 3, has A = 3.0 and B = 0.
8, C = 0.8, E = 0.08, F = 0.35, G = 0.05,
It is formed at X = 80 °, Y = 37 °, M = 14, and P = 445.

The metallic wire for the doffer and the metallic wire for the cylinder shown in FIG. 4 have a width of 2000 mm.
It was wound on a roller card of No. 1 and subjected to a comparative test with a conventional metallic wire under the following spinning conditions.

(Spinning conditions) Raw material: Nylon 0.8d × 51mm / Polyester 0.8d × 38mm (60/40) Cylinder speed: 350r.pm Doffer speed: 30r.pm Spinning rate: 15g / m ² Production rate: 100kg / h

The results of the spinning test are shown in FIGS.
When the metallic wire of the present invention is used, since the arc is provided at the tip and the arc is provided continuously to the straight portion having the inclination angle X of the root portion, the inclination angle X of the tip can be made small and the transition rate from the cylinder to the doffer can be improved. It is possible to improve and obtain a good sliver with a small number of sliver naps.

Further, the comparison result by the tip bending comparison tester according to FIG. 8 is shown in FIG. 7, and it can be seen that the product of the present invention has nearly double the strength.

[0014]

EFFECTS OF THE INVENTION Since the present invention has the above-mentioned constitution, it is possible to perform spinning with good web quality, especially in high-speed and high-production spinning in the non-woven fabric manufacturing process. Further, also in the roller doffing, since the back surface is formed by an arc, the action time with the peeling roller is long and the web is not rolled up. Further, the metallic wire for doffer has a high tooth strength, is not damaged, and can maintain good spinning for a long time.

[Brief description of drawings]

FIG. 1A is a side view of a metallic wire for doffer of the present invention, and B is a front view.

FIG. 2 is a partially enlarged view of the doffer metallic wire.

3A is a side view and B is a front view of a cylinder metallic wire combined with the doffer metallic wire of the present invention. FIG.

FIG. 4 is a configuration diagram of a roller card wound with a wire of the present invention.

FIG. 5 is a curve diagram of the number of neps showing a comparison between the present invention and the related art.

FIG. 6 is a curve diagram of a transfer rate showing a comparison between the present invention and a conventional one.

FIG. 7 is a curve diagram of bending strength showing a comparison between the present invention and a conventional one.

FIG. 8 is a schematic configuration diagram showing a bending strength measuring method.

FIG. 9 is a side view and B is a front view of a conventional metallic wire for a cylinder.

FIG. 10 is a side view and B is a front view of a conventional metallic wire for doffer.

[Explanation of symbols]

 A tooth height B tooth depth C thickness X working angle Y back angle

Claims (3)

[Claims] 1. The working angle X is 75 ° to 85 ° and the tooth depth B is
A metallic wire for a doffer used in combination with a metallic wire for a cylinder of 0.5 to 2.0 mm, having a working angle X of 45 ° to 70 °, a tooth depth B of 1.5 to 3.0 mm, and Characteristic that the working angle surface is a gentle curved surface that is upward from the upper part and shifts to the straight part, and the back angle surface is a gentle curved surface that is upward from the upper part and is shifted to a straight part with a smaller inclination angle than the working angle surface. Metallic wire for doffer. 2. The metallic for doffer according to claim 1, wherein the position of the curved surface of the working angle surface and the position of the curved surface of the back angle surface are 0 to 60% of the tooth depth B from the tooth tip. Wire. 3. The radius R ₁ of the arc of the curved surface of the working angle surface is 0.1 ^R
~ 4.2 ^R , radius R ₂ of the arc of the curved back surface is 0.1 ^R ~ 8.
The metallic wire for doffer according to claim 1, wherein the metallic wire is 4 ^R.