CN114427136A - Fiber hot-drawing setting device and drawing method thereof - Google Patents

Abstract

The invention belongs to the technical field of filament production, and particularly relates to a fiber hot-drawing setting device. The fiber hot-drawing setting device comprises: a heater; the oil tank is placed on the heater, the top of the oil tank is provided with an oil filling port, and the central position in the top surface of the oil tank is downwards sunken to form a heating groove. The device has simple structure and convenient operation.

Description

Fiber hot-drawing setting device and drawing method thereof

Technical Field

The invention belongs to the technical field of filament production, and particularly relates to a fiber hot-stretching and setting device and a stretching method thereof.

Background

The polyvinyl alcohol fiber (PVA fiber for short) is a synthetic fiber which is made by using polyvinyl alcohol as a raw material and adopting a specific technology.

The initial application of polyvinyl alcohol fibers was in their properties similar to cotton, but their strength, abrasion resistance, light resistance, corrosion resistance were superior, and their specific gravity was lighter ("application and research progress of polyvinyl alcohol fibers", johao et al, tianjin textile technology, vol 45, No. 1, page 9, left column, No. 2, lines 1-3, publication No. 2007, 4/23). In addition, the polyvinyl alcohol fiber has the advantages of large modulus, low extensibility, high impact strength, good weather resistance, good water absorption, acid resistance and alkali resistance ("research progress of high-strength and high-modulus polyvinyl alcohol (PVA) fiber", limeming et al, synthetic fiber, phase 1 of 2003, page 21, left column, phase 3, lines 1-3, published day 2003, 12 months and 31 days).

Currently, polyvinyl alcohol fibers are widely used in the fields of environmental protection, metallurgy, pharmacy, industrial catalysts, reinforcement, fishery, packaging, ion exchange, textile, etc., fire protection, military industry, metallurgy, etc. (modification and application of polyvinyl alcohol fibers, von longgen, etc., chemical development, vol.23, No. 1, No. 5-8, No. 1 of the left column on page 80, published japanese 12/31; "application and research development of polyvinyl alcohol fibers", zhaxing, etc., tianjin textile technology, vol.45, No. 1, No. 5-7, No. 2, No. 1-2, No. 1-3, No. 2007, No. 4/23).

During the preparation process of the polyvinyl alcohol fiber, dry hot stretching is needed so as to realize the performance of high strength and high modulus. In general, in the dry heat stretching process, the orientation degree and crystallinity degree of the polyvinyl alcohol fiber are improved along with the increase of the stretching ratio, and simultaneously, the dry breaking strength and Young modulus of the polyvinyl alcohol fiber are also increased. Specifically, the dry heat stretching of the polyvinyl alcohol fiber is carried out at a high temperature of 220 to 230 ℃ at which the fiber is nearly in a molten state, and generally, the dry heat stretching ratio is 3 to 3.5 times. After the polyvinyl alcohol fiber is subjected to dry heat stretching, macromolecules of the polyvinyl alcohol fiber are changed into a straightened state from a curled state, and the state is very unstable due to the existence of internal stress of the fiber. Therefore, in order to eliminate internal stress and consolidate the stretching effect, the fibers also need to be heat-set.

At present, the stretching and heat setting equipment for polyvinyl alcohol fiber has the following defects: the temperature fluctuation is large in the initial stage of operation, the energy consumption is high, and the operation is complicated and even the realization can not be realized if a certain section of fiber sample needs to be subjected to a stretching and heat setting test independently.

Disclosure of Invention

In view of the above, the present invention is directed to a fiber hot-drawing setting device.

In order to achieve the purpose, the technical scheme of the invention is as follows:

fibre hot stretch setting device includes:

a heater;

the oil tank is placed on the heater, the top of the oil tank is provided with an oil filling port, and the central position of the top surface of the oil tank is downwards sunken to form a heating groove.

Further, the heating groove is a V-shaped groove.

Further, the bottom of the heating groove is arc-shaped.

Further, the surface roughness Ra of the bottom of the heating groove is less than or equal to 0.2.

Furthermore, a length scale mark is arranged at a position, close to the bottom of the groove, on the groove wall on one side of the heating groove, and the length scale mark is arranged along the extending direction of the heating groove.

Further, a thermometer is arranged in the oil tank.

Further, a sealing valve is arranged at the oil filling port.

The invention also relates to a method for hot-drawing and setting protective fibres, in which the fibres are drawn using a device according to any one of claims 1 to 7.

Further, the fiber hot-drawing setting method comprises the following steps:

injecting heat conducting oil into the oil tank;

heating the heat conducting oil to 80-230 ℃ by a heater;

uniformly contacting the fibers with a heating groove until the fibers are softened;

slowly stretching the fiber to a preset stretching end point,

keeping the tension unchanged until the fiber is shaped, and taking out the fiber. .

The invention has the beneficial effects that:

the device has the advantages of accurate temperature control, good stability and no problem of large temperature fluctuation.

The device has simple structure and low manufacturing cost; the operation is convenient, and can be easily finished by one person.

The device can independently carry out the stretching and heat setting test on a certain section of fiber sample

The device has wide application range and can be used for hot drawing and shaping of various fibers.

Drawings

Fig. 1 is a schematic view of the apparatus of example 1, wherein,

1 is an oil tank, 2 is an oil filling port, 3 is a heating tank, 4 is a heater, and 5 is a thermometer;

fig. 2 is a schematic structural view of a heating bath according to embodiment 1, in which,

3 is a heating groove, 31 is an arc part.

Detailed Description

The examples are provided for better illustration of the present invention, but the present invention is not limited to the examples. Therefore, those skilled in the art should make insubstantial modifications and adaptations to the embodiments of the present invention in light of the above teachings and remain within the scope of the invention.

Example 1

A fiber hot-drawing setting apparatus as shown in fig. 1, comprising:

a heater 4;

the oil tank 1 is placed on the heater 4, the top of the oil tank is provided with an oil filling port 2, and the center of the top surface of the oil tank 1 is downwards sunken to form a heating groove 3;

the heating groove 3 is a V-shaped groove;

the bottom of the heating groove 3 is arc-shaped 31 (as shown in fig. 2);

the surface roughness Ra of the bottom of the heating groove 3 is less than or equal to 0.2;

a length scale mark is arranged at a position, close to the bottom of the heating groove 3, on the groove wall at one side of the heating groove, and the length scale mark is arranged along the extending direction of the heating groove 3;

a thermometer 5 is arranged in the oil tank, and the measuring range of the thermometer 5 is more than 230 ℃;

a sealing valve is arranged at the oil filling port 2;

in this embodiment, specifically, the oil tank 1 is cylindrical, and the heater 4 is an electric furnace.

When the device of the embodiment is used for stretching fibers, the sealing valve is opened, 320# mineral heat conduction oil (the temperature is lower than 300 ℃ and can be stably used) is injected into the oil tank 1, then the sealing valve is closed, the fibers are heated to 80-230 ℃ through an electric furnace, the two ends of the fibers are pulled by hands, the fibers are uniformly contacted with the heating groove 3 for 3-5 seconds, the heat of the heat conduction oil is transferred to the fibers through the heating groove 3, so that the fibers are softened, the fibers are slowly stretched, and when a preset stretching end point is reached, the fibers are heat-set in the heating groove for 2-3 seconds by keeping the tension unchanged.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (9)

1. Fibre hot drawing setting device which characterized in that includes:

a heater;

the oil tank is placed on the heater, the top of the oil tank is provided with an oil filling port, and the central position of the top surface of the oil tank is downwards sunken to form a heating groove.

2. The apparatus of claim 1, wherein the heating channel is a V-shaped channel.

3. The apparatus of claim 1 or 2, wherein the bottom of the heating tank is curved.

4. The apparatus according to any one of claims 1 to 4, wherein the bottom of the heating bath has a surface roughness Ra of 0.2 or less.

5. The apparatus as claimed in any one of claims 1 to 4, wherein a length scale mark is provided on a side wall of the heating bath at a position close to a bottom of the bath, the length scale mark being provided along an extending direction of the heating bath.

6. A device according to any one of claims 1 to 5, wherein a thermometer is provided in the reservoir.

7. The apparatus according to any one of claims 1 to 6, wherein a sealing valve is provided at the fueling port.

8. A method for hot-drawing and setting fibers, characterized in that the fibers are drawn by using the apparatus according to any one of claims 1 to 7.

9. The method of claim 8, comprising the steps of:

injecting heat conducting oil into the oil tank;

heating the heat conducting oil to 80-230 ℃ by a heater;

uniformly contacting the fibers with a heating groove until the fibers are softened;

the fiber is stretched to a preset stretching end point,

keeping the tension unchanged until the fiber is shaped, and taking out the fiber.

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