KR101227845B1 - Tapered mono filament and process for tapering of mono filament - Google Patents

Abstract

The present invention relates to a method of making a thick filament and then tapering it. Specifically, a) melting the synthetic resin composition comprising a polyester-based resin, extruded to a thickness of 1 to 8mm, stretching 1.5 to 6 times to prepare a monofilament; b) manufacturing the monofilament into a bundle of 40 to 55 mm thick; c) cutting the monofilament; d) sealing one end of the bundle; And e) immersing the non-sealed opposite end of the bundle in which one end is sealed in a processing tank containing an alkali solution at a concentration of 100 to 140 ° C. and 30 to 60%; It relates to a taper processing method of the monofilament comprising a. The tapered filaments according to the present invention have a thick thickness, which is excellent in strength and maintains a constant shape, thereby enabling various products in the form of interdental toothbrushes, nails, needles, or awls. Additives can also be added to produce tapered filaments of flexibility, increased surface area or high strength.

Description

Tapered mono filament and process for tapering of mono filament

The present invention relates to a method for producing and tapering monofilaments of coarse thickness. Specifically, the present invention relates to a method of producing a functional filament by spinning a thick polyester monofilament, and then tapering.

Processing technology of micro-model monofilament using polyester has been continuously developed as a micro hair for toothbrushes, starting with Japan. The processing method of the monofilament for toothbrush is tapered using alkaline aqueous solution, such as NaOH. It is known that the thickness of the monofilament using the polyester-based resin is generally tapered in the range of 0.15 mm to 0.23 mm. In the case of manufacturing more than 0.3mm, mass production was impossible because it is difficult to manufacture a filament having a constant thickness and a constant taper length during tapering.

Therefore, the present invention is to provide a processing method for producing a polyester monofilament of a thick thickness of 0.5 mm or more of the final product, and to have a constant thickness and a constant taper length.

In another aspect, the present invention is to provide a method of adding a functional material to increase the flexibility, surface area or strength in the production of polyester monofilament.

It is another object of the present invention to provide a method for preparing tapered polyester monofilament in wave form or emboss form.

The present invention relates to a process for the production of thick polyester monofilaments of at least 0.5 mm. In particular, the present invention relates to a tapered filament at one end to be used in nails, interdental toothbrushes, awls and the like.

Specifically, one aspect of the present invention is made of a synthetic resin, the taper is formed at one end and the thickness relates to a taper processing method of thick filament of 0.5 mm or more, more specifically 0.5 mm ~ 5mm.

Another aspect of the present invention relates to a method for tapering filaments imparted with a function by adding and spinning functional additives.

Yet another aspect of the present invention relates to a tapering method of filaments having embossed waves or surfaces.

Hereinafter, the present invention will be described more specifically.

Polyester resins were difficult to produce thick monofilaments of 0.5 mm or more due to their low viscosity and easy cutting.

However, the present inventors have studied to prepare a polyester polyester filament of 0.5 mm or more and taper processing at one end thereof. As a result, the polyester resin is cooled in a cooling water of 13 ° C. or lower and primary at 150 to 220 ° C. during melt spinning. Stretching; And repeating the step of cooling at a low temperature water of 25 ° C. or less and stretching at 150 to 220 ° C. two or more times, thereby producing monofilaments having a constant thickness without cutting even when manufactured to a thickness of 0.5 mm or more. The present invention was completed by discovering that it can be produced.

After manufacturing a thick monofilament by the stretching method, the monofilament is bundled into bundles, processed into bundles to facilitate tapering, and one end is sealed so that the alkaline solution is mono The present invention has been accomplished by discovering that it is surprisingly uniform and capable of tapering to a desired length by preventing riding up between the filaments.

That is, the present invention is characterized in producing a thick monofilament of 0.5 mm or more using a polyester resin, and is characterized in a process of tapering a uniform and desired length on one surface thereof.

This manufacturing method is melt-extruded to 1.5 ~ 6 times the thickness of the final monofilament, more specifically 1 to 8 mm thickness during extrusion of the synthetic resin composition, and then the drawn raw filaments are processed into bundles, cut to a certain length After the one end is sealed, the non-closed end is immersed in the processing tank containing the alkali solution and the step of tapering.

More specifically,

a) melting a synthetic resin composition comprising a polyester-based resin, extruding to a thickness of 2 to 8 mm, and stretching 1.5 to 6 times to prepare a monofilament;

b) manufacturing the monofilament in a bundle;

c) cutting the bundle;

d) sealing one end of the bundle; And

e) tapering the non-sealed opposite end of the bundle in which one end is sealed in a processing tank containing an alkali solution;

It includes.

In the step a) of the present invention, the synthetic resin composition may include a polyester resin, and may further include any one or two or more resins selected from an elastomeric resin, a thermoplastic resin, and a silicone resin, if necessary.

In addition, the resin composition may further include an inorganic additive as needed.

The inorganic additive is used to adjust the polyester properties such as strength and elasticity of the product, and to provide surface irregularities and antimicrobial properties for imparting functionalities of the processed surface after taper, and the amount thereof is 0.3 to 100 parts by weight of the polyester resin. It is preferable to include 40 parts by weight.

The polyester resin may be used by mixing any one or two or more selected from polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT), polybutylene terephthalate (PBT). More preferably, the synthetic resin is preferably at least 1000 cN in tensile strength and 10 to 40% in tensile elongation because of excellent durability.

The elastomer-based resin is used to impart elasticity, and is propylene-α such as ethylene-α olefin elastomer, such as ethylene-hexene elastomer, ethylene-octene elastomer, propylene-hexene elastomer, propylene-octene elastomer, etc. Thermoplastic olefin elastomers including olefin elastomers, ethylene-propylene-diene elastomers, and the like, styrene-butadiene block copolymers, styrene-isoprene block copolymers, hydrogenated styrene-butadiene elastomers, styrene-butadiene-styrene elastomers, Thermoplastic styrene elastomers including styrene-ethylene-butylene-styrene-based elastomers, styrene-ethylene-propylene-styrene-based elastomers, and the like, and the like, and these may be used alone or as a mixture thereof.

The thermoplastic resin is used to improve flexibility, and polyethylene, polypropylene, or a copolymer thereof may be used.

The silicone resin may be used to increase compressive strength and wear resistance and maintain flexibility.

The inorganic additive may be calcium carbonate, silica, silver nano powder, platinum nano powder, charcoal powder, TiO ₂ , TiON, fluorine, antibacterial agents and the like.

Melting and extruding in step a) comprises extruding the synthetic resin composition using a nozzle having a plurality of holes (4 to 32) having a diameter of 2 to 8 mm in an extruder heated to 220 to 280 ° C, and then to 1.5 to Stretch it at 6 times the stretching ratio and wind it up to the take-up machine. In the drawing, the total drawing ratio is preferably drawn in a range of 1.5 to 6 times, and in the case of less than 1.5 times, there is a change in color, the strength is weak, and the elongation cannot be formed to form a constant taper. If it is more than 6 times, flexibility is very low and cutting occurs during drawing.

At this time, the stretching is the first step of cooling at 150 ~ 220 ℃ and cooling in cooling water of 13 ℃ or less; And repeating two or more steps of cooling in a low temperature water of 25 ° C. or lower and stretching at 150 to 220 ° C. two times or more, so that the strength is improved, durability is excellent, and a filament having a thickness of 0.5 mm or more can be produced. desirable. In addition, it is preferable that the stretching is dry stretching.

Specifically, in the present invention, the stretching process is preferably performed two to four times, more preferably, the fourth stretching. In the case of the fourth stretching, after cooling with 5 to 13 ° C. cooling water, the primary drawing is first performed at 30 to 50% of the total drawing ratio at 150 to 220 ° C., and then cooled again with low temperature water of 25 ° C. or less, and then 150 Secondary stretching to 15 to 30% of the total stretching ratio at ~ 220 ℃, and then cooled again with cold water below 25 ℃, third stretching to 15 to 30% of the total stretching ratio at 150 ~ 220 ℃, again After cooling with cold water of 25 ° C. or less, the fourth drawing is performed at 150 to 220 ° C. at 15 to 30% of the total drawing ratio. By repeating this cooling and shrinking surprisingly, the strength is further improved, making it possible to produce thick polyester monofilaments of 0.5 mm or more.

In general, the filament drawing method of the general thickness is drawn at a drawing ratio of 80% or more in the primary drawing, but in order to produce a thick filament, the resin discharged from the extruder before the primary drawing is rapidly cooled to 13 ° C. or less as described above. The color is kept constant, and 150 to 220 ° C. dry hot air is first drawn to 30 to 50%, more preferably 40% of the total draw ratio, and then cooled again with cold water below 25 ° C. to shrink. , 150-220 ° C. dry hot air was added, followed by secondary drawing at 15-30% of the total draw ratio, more preferably 20%, and then cooled again with cold water of 25 ° C. or lower, and then contracted with 150-220 ° C. Dry hot air was added, and the third drawing was carried out to 15 to 30% of the total draw ratio, more preferably 20%, followed by cooling with low temperature water of 25 ° C. or lower and shrinking, followed by dry hot air of 150 to 220 ° C. , 15-30% of total draw ratio Straight it will be stretched 4 to 20% tea.

The thickness of the yarn filament prepared after the stretching is preferably 0.5 ~ 5 mm. If it is less than 0.5mm, the strength is weak. If it is more than 5mm, unstretching occurs and it is difficult to maintain a certain roundness and straightness.

In the present invention, it is also possible to form a wave at the end of the filament or emboss on the surface as necessary in the stretching process. Such processing can be prepared by known processing methods. The thick filaments with wave or embossed shape may be deformed due to the large voids between the filaments and the force exerted on each other in the refraction area when the bundle is manufactured for tapering. It is preferable to wind after passing through the cooling water tank below 5 degreeC, fixing a product shape.

Next step b) is a process of manufacturing the stretched monofilament as a bundle, the thickness of the bundle is preferably 40 to 55mm because it is excellent in workability and processing surface for forming a taper.

Next, step c) is a process of cutting the bundle to a certain length, and cuts about 1 to 10 mm longer than the length of the finished product or the length of the finished product. When sealing with agar or carrageenan in the following sealing process, it can be cut to the length of the finished product.In case of melt sealing by applying heat, the length of the bundle must be removed in consideration of this because the melt sealed part must be removed after the taper treatment. Adjust

Step d) is a process of sealing one end of the bundle, the sealing is immersed one end of the bundle in a reaction vessel in which carrageenan, agar, or water-soluble resin is melted, and then solidified it to seal one side. Specifically, after carrageenan or agar is melted at 90 ° C. or more, one end of the bundle opposite to the processed surface of the bundle is immersed, and then cooled to a temperature of 40 ° C. or lower to seal one end at the same time.

The water-soluble resin may be used, such as polyvinyl alcohol. The carrageenan or agar is more preferable because it is easy to remove by washing after tapering and harmless to the human body.

Alternatively, the melt may be sealed by heating to the melting temperature of the synthetic resin. At this time, the sealed portion is preferably sealed to 1 ~ 10mm portion from one end of the bundle.

Thereafter, one end of the opposite end of the sealed bundle is immersed in a processing tank containing an alkali solution of 100 ~ 140 ℃, 30 ~ 60% concentration and tapered. At this time, the length of the tapered can be adjusted according to the length to be immersed, and the present invention can substantially form a taper as long as the length of the immersion because the alkali solution can not rise between the fibers by the capillary phenomenon.

The alkaline solution may be caustic soda at a concentration of 30 to 60%, and heating to a temperature of 100 to 140 ° C. is preferred because it reduces the tapering time and can be manufactured in a uniform tapered form. At this time, the temperature deviation of the processing tank is preferably ± 2 ℃. If the temperature deviation is out of this range, it is desirable to maintain this margin of error, because even in bundles processed in the same processing tank, there is a difference in length and taper shape.

Thereafter, the tapered portion may be formed by washing and removing the hydrolyzed portion. At this time, the washing is washed in running water. Finally, neutralize the alkali with dilute sulfuric acid and wash with water again.

When manufactured by the manufacturing method according to the invention various products in the form of interdental toothbrush, nail, needle or awl are possible. Additives can also be added to produce tapered filaments of flexibility, increased surface area or high strength.

1 is a photograph showing an example of a monofilament prepared according to the present invention.
Figure 2 is a photograph showing an example of a wave formed monofilament prepared according to the present invention.

Hereinafter, the present invention will be described in more detail with reference to Examples in order to explain the present invention. However, the present invention is not limited to the following Examples.

Example 1

Polybutylene terephthalate resin (Toraycon 1100) was melted at 250 ° C. and extruded to a thickness of 4.8 mm.

After cooling the extruded yarn with cold water at 10 ° C., the primary drawing was performed at 180 ° C. to 40% of the total draw ratio, and then cooled again with cold water at 15 ° C., and then 20% of the total draw ratio at 180 ° C. After the second stretching, and cooled again with cold water of 15 ℃, the third stretch at 20% of the total draw ratio at 180 ℃, and then cooled again with cold water at 15 ℃, total stretching at 180 ℃ Fourth stretching was performed at 20% of the magnification, and stretching was performed so that the total stretching ratio was four times. The monofilament thickness was 1.2 mm.

The monofilament was made into bundles of 40 mm in diameter and then cut into 60 mm lengths.

5 parts by weight of agar was added to 100 parts by weight of water, and then dissolved at 95 ° C. One end of the bundle was immersed in 3 mm, and then sealed at the same time as cooling.

The unsealed end of the bundle was immersed in alkaline solution 15 mm and processed for 6 hours. On the immersed portion, a white mass was produced in which the resin was hydrolyzed. The white mass was washed twice with water, neutralized with dilute sulfuric acid and washed again.

As a result, as shown in Figure 1, it was confirmed that the tapered filament is a constant surface and tapered was produced.

[Example 2]

Polybutylene terephthalate resin (Toraycon 1100) was melted at 250 ° C. and extruded to a thickness of 5 mm. The extruded yarn was repeatedly cooled and stretched four times in the same process as in Example 1, and the total draw ratio was stretched five times. The monofilament thickness was 1 mm.

After the stretching, the wave filament was formed by placing a wave gear (toothed rotary frame) at the rear end to pass the filament between the gears. At this time, the spacing of the wave gear was 0.8 mm to prepare a filament.

The wave-formed monofilament was made into a bundle of 40 mm in diameter and then cut into 60 mm lengths.

5 parts by weight of agar was added to 100 parts by weight of water, and then dissolved at 95 ° C. One end of the bundle was immersed in 3 mm, and then sealed at the same time as cooling.

The unsealed end of the bundle was immersed in alkaline solution 15 mm and processed for 6 hours. On the immersed portion, a white mass was produced in which the resin was hydrolyzed. The white mass was washed twice with water, neutralized with dilute sulfuric acid and washed again.

As a result, as shown in FIG. 2, a tapered filament in which a wave of a certain shape was formed on the surface thereof could be manufactured.

[Example 3]

To 100 parts by weight of polybutylene terephthalate resin (manufactured by Toraycon 1100), 5 parts by weight of silicone (MB50-010, Ohsung Polytech) was added, melted at 250 ° C, and extruded to a thickness of 6 mm. The extruded yarn was repeatedly cooled and stretched four times in the same process as in Example 1, and the total draw ratio was stretched three times. The monofilament thickness was 2 mm.

The monofilament was made into bundles of 40 mm in diameter and then cut into 60 mm lengths.

5 parts by weight of agar was added to 100 parts by weight of water, and then dissolved at 95 ° C. One end of the bundle was immersed in 3 mm, and then sealed at the same time as cooling.

The unsealed end of the bundle was immersed in alkaline solution 15 mm and processed for 6 hours. On the immersed portion, a white mass was produced in which the resin was hydrolyzed. The white mass was washed twice with water, neutralized with dilute sulfuric acid and washed again.

As a result, it was confirmed that the surface was constant and a tapered filament was produced. In addition, it was confirmed that a flexible filament was produced as compared with Example 1.

Claims (10)

a) melting a synthetic resin composition comprising a polyester-based resin, extruding to a thickness of 1 to 8 mm, and stretching to 1.5 to 6 times to prepare a monofilament;
b) manufacturing the monofilament in a bundle;
c) cutting the monofilament;
d) sealing one end of the bundle using carrageenan, agar, or water-soluble resin, or sealing by heating to a synthetic resin melting temperature of monofilament; And
e) tapering the non-sealed opposite end of the bundle in which one end is sealed in a processing tank containing an alkali solution;
Tapered processing method of the monofilament comprising a. delete The method of claim 1,
The tapered processing method of the monofilament is a thickness of the monofilament stretched in step a) is 0.5 ~ 5 mm. The method of claim 1,
Stretching in the step a) is the first step of cooling at 150 ~ 220 ℃ and cooling in cooling water of 13 ℃ or less; And repeating the step of cooling at a low temperature water of 25 ° C. or lower and stretching at 150 to 220 ° C. two or more times. 5. The method of claim 4,
The stretching in the step a) is the tapered processing method of the monofilament to be carried out in a temperature range of 150 ~ 220 ℃. The method of claim 1,
The synthetic resin composition in step a) taper processing method of the monofilament further comprises any one or two or more selected from an elastomeric resin, a thermoplastic resin, a silicone resin. The method according to claim 6,
The synthetic resin composition is a tapered processing method of the monofilament further comprises an inorganic filler. The method according to any one of claims 1 and 3 to 7, wherein
The monofilament is tapered processing method of the monofilament that is embossed on the wave or surface.
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