JPS62199881A - Method for coating monofilament - 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 (Field of Industrial Application) The present invention relates to a method for stably and efficiently applying a resin coating film of uniform thickness to the surface of synthetic resin monofilaments 1 to 1. It is.

(Prior art) It has been widely used in the past to provide properties such as wash resistance, antistatic properties, stain removal properties, dyeability, weather resistance, and convergence properties by applying various resin coatings to synthetic fiber threads. This is also the case for synthetic resin monofilaments.
For example, a method has been proposed to improve the performance of fishing lines and brushes by coating them with vinylidene chloride resin (Japanese Patent Application Laid-Open No. 58-51828 and Japanese Patent Application Laid-Open No. 58-21'1582@). .

However, compared to ordinary fibers, monofilament has
Even with the same denier, the surface area is small, so when attempting to improve the material defects of the monofilament by applying a resin coating, the uniformity of the resin coating film is strictly required.

In other words, since a multifilament is an aggregate of single fibers, even if the resin coating film is not uniformly attached to each short fiber, it can be expected that the performance will be averaged by the aggregate. Since the performance of the resin coating itself is a problem, if the resin coating film is not adhered uniformly, stable improved performance will not be exhibited. Therefore, when applying resin coating to monofilament, it is necessary to soak the fiber in a resin coating solution and dry it, as is often done with multifilament.
Even if the simple method of curing is adopted, it is not possible to obtain uniform adhesion of the resin coating film, and furthermore, excellent improved performance cannot be obtained, and it is necessary to specially consider means for uniform adhesion.

Conventionally, methods for achieving uniform adhesion of resin coating films to monofilaments include passing the monofilament through a coating bath and then using a grooved roll, a gravure roll, a wiper, a bat made of two felts, etc. A method of passing the monofilament through a hot water bath and a method of passing the monofilament through a coating bath and a method of heating the coating liquid have also been attempted.

(Problems to be Solved by the Invention) However, even with the conventional methods described above, the uniform adhesion of the resin coating film to the monofilament is still insufficient, and the desired improved performance cannot be achieved sufficiently. It was difficult to achieve.

Therefore, the present inventors conducted intensive studies with the aim of establishing a method for stably and efficiently applying a uniform resin coating film to synthetic resin monofilaments. The inventors have discovered that the above object can be effectively achieved by passing it through a specific die while it is being held, and have arrived at the present invention.

(Means for Solving the Problems) That is, in the present invention, when applying a resin coating to the surface of a monofilament, the monofilament coated with a resin coating liquid is coated with a resin coating solution in a diameter of 1.
The present invention provides a method for coating a monofilament, characterized in that the resin coating liquid is passed through a die having a pore diameter of 0.01 to 1.50 times, and then solidified.

The monofilament used in the present invention is obtained by melt-spinning thermoplastic resins such as polyamide, polyester, polyolefin, and polyhalogenated hydrocarbon by a conventional method, and drawing and heat-setting as necessary. ．．
It is a fibrous material with a length of 0.05 to 4.00 m.

The resin coating liquid used in the present invention is a paint, adhesive, coating agent, resin treatment agent, etc. that is normally used to improve material defects of monofilament, and when applied to monofilament, it is in liquid or liquid form. pace 1
It means a material having the shape of ~, which has the ability to harden and solidify to form a resin-like thin film by not performing treatments such as drying, heat treatment, chemical reaction, and radiation reaction.

In more detail, acrylic, styrene, vinyl such as vinyl chloride, urethane, epoxy, phenol,
Examples include solutions, emulsions, and dispersions of polymeric substances capable of forming thin films, such as polyester, alkyd, melamine/urea, and rubber.

These resin coating liquids have a viscosity of 5,000 voices or less, preferably 3.0 mm, while still retaining fluidity after being applied to the monofilament.
It is preferable that it be in the range of 000 poise to 5 centipoise. If the viscosity is too high, rubbing marks will remain when passing through the die, making it impossible to obtain a smooth coating film, and if the viscosity is too low, the coating liquid will flow even after passing through the die, resulting in a uniform coating. This is not preferred because a film may not be obtained.

Methods for applying these resin coating liquids to monofilaments include dipping, spraying, and painting.
Although other conventional coating methods can be employed, the dipping method, which consists of passing the monofilament through a coating bath, is most advantageous.

In the present invention, it is important to uniformize the coating film by passing the resin coating liquid applied to the monofilament 1 through the die while it still retains its fluidity. .

The die used in the present invention has a pore diameter of 1.01 to 1.50 times, particularly 1.02 to 1.50 times, the diameter of the monofilament.
It is preferable to use a method that satisfies the conditions within the range of 1.45 times and also has a format in which the coating liquid removed by adjusting the film thickness at the inlet of the die does not come into contact with the adjusted monofilament again.

Here, the pore diameter of the die is 1.01 of the monofilament diameter.
If the diameter is less than 1.5 times, the monofilament 1~ itself has diameter irregularities, which not only causes non-uniformity of the coating film depending on this diameter irregularity, but also makes it difficult to pass through the die continuously in severe cases. Therefore, it is undesirable. Although slight non-uniformity in the coating film due to unevenness in the diameter of the monofilament itself cannot be avoided even with the method of the present invention, the coating can be improved by making the pore diameter of the die at least 1.01 times the diameter of the monofilament. The diameter unevenness of the applied monofilament is reduced and the stability of usage is excellent.

If the pore diameter of the die exceeds 1.50 times the monofilament diameter, the uniformity of the coating film passing through the die will be achieved, but the coating liquid will flow before it solidifies, causing deformation and distortion. This is not preferable because good uniformity cannot be obtained as a result.

The size of the hole in the die is not particularly limited, but it is usually preferably about 100 times the hole diameter or less, or about 2[alpha]m or less in length.

Materials for the dice include porcelain, glass, ceramics, and plastic.

In order to prevent the coating liquid from coming into contact with the monofilament after passing through it and to increase the compatibility between the monofilament and the coating liquid, the die may be provided with notches, tapers, protrusions, etc. at the entrance and/or exit of the hole. I can do it.

The running direction of the monofilaments 1 to 1 may be any direction parallel to or perpendicular to the earth's gravity, but in the case of coating by the dipping method, it is desirable to run the monofilaments in a vertical direction.

In the present invention, the monofilament is coated with a coating liquid and passed through the die, and then subjected to treatments such as drying, heat treatment, chemical reaction, and radiation reaction, thereby producing a uniform resin-like material that has hardened and solidified on the surface. A monofilament with a thin film formed thereon can be obtained efficiently and stably.

EXAMPLES Below, the effects of the present invention will be briefly explained with reference to Examples.

(Example 1) Nylon 6 was melt-spun using a conventional method, stretched and heat-set to a rough total stretching ratio of 4.5 times, and wound onto a drum with a body diameter of 300 ant at a speed of 150 m/min. A nylon 6 monofilament with a diameter of 0.20 m was produced.

On the other hand, between two pairs of constant speed rollers, a coating liquid application bath with a thickness of 5 cm and a hole diameter of 0.5 cm were placed at a distance of 5 cm. An apparatus was prepared in which a stainless steel die measuring 24 m in length and 3 m in length was installed, and a hot air drying furnace and a cooling tank roughly 6 m in length were arranged.

The coating liquid application bath of the above apparatus was filled with a solution type polyester resin paint having a viscosity of 1,000 voices as the coating liquid, and the hot air drying oven was maintained at 180°C. The nylon 6 monofilament obtained above was coated by passing through this device continuously at a speed of 8 m/min. and short axis are respectively 0.208#, J, and 0.215
It had a substantially circular cross section of m, and the state of adhesion of the coating film was extremely uniform and rare.

(Comparative Example 1) Example 1 except that a pair of felts carrying a 500Q weight were installed instead of the stainless steel die, and the monofilament coated with the coating liquid was passed between the felts. As a result of producing nylon 6 monofilament whose surface was coated with polyester resin in the same manner as in 1, the jqed monofilament had an average of 3 or more knob-like protrusions with a width of 0.3 m or more in 5 m of the sample, and the coating film was Not only was the uniformity poor, but the dimensional stability was also poor.

(Examples 2 to 4 and Comparative Examples 2 to 3) Polyethylene terephthalate was melt-spun by a conventional method, roughly stretched so that the total stretching ratio was 5.0 times, and heat-set to obtain a diameter of 0. A .40 IWn polyester monofilament was produced.

In the apparatus of Example 1, coating was carried out under the same conditions as in Example 1, except that the pore diameter of the die was changed as shown in Table 1, and an acrylic resin emulsion with a viscosity of 5 poise was used as the coating liquid. .

For the obtained acrylic resin-coated polyester monofilament, the average value of the major axis and minor axis in the same cross section was determined, and the results are also shown in Table 1. From the results in Table 1, stable operation is impossible if the die pore diameter is less than 1.01 times the monofilament l-diameter, and if it exceeds 1.5 times, the uniformity of the coating film is significantly impaired. is clear.

Table-1 *1... Multiplier of die hole diameter to monofilament diameter *2... Monofilament clogs the die, making operation impossible (effects of the invention) According to the method of the present invention, synthetic resin A uniform resin coating film can be stably and efficiently applied to a monofilament, and it can be effectively applied in a method for improving monofilament defects using a resin coating film.

Claims (1)

[Claims] When applying a resin coating to the surface of a monofilament, the monofilament coated with a resin coating liquid is passed through a die having a hole diameter of 1.01 to 1.50 times the diameter of the monofilament, and then the resin coating liquid is solidified. A monofilament coating method characterized by: