JP2852642B2 - Bonding method of polyurethane elastic yarn - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for securely joining a terminal yarn at the beginning of a polyurethane elastic yarn wound body and a terminal yarn at the end of a wound body to be joined next, and continuously forming one wound body. The present invention relates to a method for joining polyurethane elastic yarns, which is suitable for continuous supply even after the end of the yarn amount.

[0002]

2. Description of the Related Art Polyurethane elastic yarns are used in a wide range of fields such as clothing, medical products, industrial materials, etc. because of their excellent elastic properties. Usually, a polyurethane elastic yarn is supplied to a user as a wound body wound up by a predetermined amount on a paper tube. The single wound body is wound at a maximum of 1.1 kg / cheese. Recently, in the medical field,
As disclosed in Japanese Patent Publication No. 9-1.5, 1.5-6 kg /
Mekuito body of the cheese have been proposed.

[0003] Generally, the machine in operation is stopped just before the amount of yarn in one wound body is exhausted during the supply of the polyurethane elastic yarn, and the end yarn of the next wound body and the hand-wound end yarn are hand-operated. It is the fact that they are connected and operated continuously. This is a problem that can occur even if the amount of the polyurethane elastic yarn is increased. In general, polyurethane elastic yarn is stretched and used.Therefore, when tied by hand, there is a problem that the knot may be loosened or unraveled due to a work error.
If there is a guide or the like at the time of supply to the machine, there is a drawback that the hand-knot portion is caught on the guide and cuts the polyurethane elastic yarn. The present inventors have proposed a device and a method for thermally bonding polyurethane elastic yarns in Japanese Patent Application No. Hei 7-186557 in order to solve these problems. It is necessary to cut and remove the unnecessary thread at the non-joined part with a knife, and the minute length end thread may jump out and remain, which may be caught by a guide or the like and cut the polyurethane elastic thread at the joint part. It was not completely eliminated.

[0004]

SUMMARY OF THE INVENTION The present invention relates to two poly
Upon bonding the urethane elastic yarn, the small length with eliminating work of removing non joint portion of the joint portion in the prior art
An object of the present invention is to provide an improved polyurethane elastic yarn joining method in which a joining portion is made more reliable without the terminal yarn jumping out and remaining , and yarn breakage is prevented.

[0005]

According to the present invention, there is provided a polyurethane elastic yarn wound body, wherein the end of the yarn at the beginning of winding and the winding to be joined next are wound.
Strange previously heating and pressurizing treatment to the terminal portion of the yarn end wound yarn body
To form a shaped part, then two to be joined comprising the modified form part
The problem is solved by a method for joining polyurethane elastic yarns in which the end portions of the polyurethane elastic yarns are overlapped and heated and pressed. In this specification, the deformed part
Is a flattened shape, even a flat shape
Also refers to any of the tapered shapes.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The polyurethane elastic yarn of the present invention comprises:
Any of elastic yarns made of polyether, polyester, polyether / polyester, etc. may be used, and the fineness of the elastic yarn is not limited, and other ultraviolet protective agents such as titanium oxide as a matting agent are added. The amount of mineral oil, silicone oil, modified polysiloxane, etc. that is usually applied to the polyurethane elastic yarn at the time of winding up may or may not adhere to the polyurethane elastic yarn. It is not something to be done.

In the joining method of the present invention, the end portion of the yarn at the beginning of the winding of the polyurethane elastic yarn wound body is preliminarily wound with the winding to be joined next.
Heating the adhesive temperature T ₀ ° C. polyurethane elastic yarn about 2~5mm length as the terminal manager a using an apparatus comprising a terminal portion of the yarn end wound yarn body from an upper heating section and a lower heating unit shown in FIG. 1 Temperature T ₁ ° C, the upper heating unit and the lower heating unit are heated in a temperature range of T ₀ -80 <T ₁ <T ₀ -20,
The upper heating section is pressed against the lower heating section and processed for about 5 seconds to deform the terminal section. The pressing method at this time may be any method, and the apparatus to be used is not limited to the one having the shape and structure shown in FIG. The deformed portion of the terminal portion, then carried the
Ends of two polyurethane elastic yarns to be joined including deformed part
When the ends are overlapped and heated and pressed, the deformed part
The polyurethane elastic yarn containing
Anything can be used. The deformed portion may be either a flattened flat shape, a gentle flat shape, or a tapered shape.
Any shape is acceptable. By adopting such a shape,
The thickness of the urethane elastic yarn is reduced, and the heating and pressing
This causes thermal deformation in the deformed part, and secures fusion bonding.
It is done. Also, deformed terminal manager a becomes difficult operation as being 2mm or less, so is not desirable longer length to be joined of the polyurethane elastic yarn of two during when longer followed bonding that takes place 5 mm, terminal manager a is 2-5 mm is preferred.

Next, two polyurethane elastic yarns Y ₁ and Y ₂ whose terminal portions are previously deformed by 2 to 5 mm in length are connected to each of the two terminal portions to be joined including both terminal portions deformed as shown in FIG. L ₁ length overlay, as shown in FIG. 3, consisting of a lower heating section provided with a rectangular longitudinal groove to fit when the protrusion of the upper heating portion provided with a rectangular protrusion is pressed It is inserted into the vertical groove of the lower heating part of the device in the state of FIG.
In this case, the length L ₂ of the rectangular projections of the upper heating section for length and fit of the rectangular longitudinal groove of the lower heating portion, the polyurethane elastic yarn of two Y _1, overlapping length of Y ₂ L ₁ More preferably, it is twice as long. In other words, the overlapping length _{L 1} is 15
20mm are preferred, overlay relationship between the length L ₂ of the rectangular projection of the length L ₁ and the upper heating unit, twice outside the above-mentioned range
If it is smaller, the deformed end portion will not be fusion bonded to the undeformed yarn portion. If it is larger than twice, the fusion bonded portion of the two polyurethane elastic yarns to be bonded will be long. Too undesirable. As shown in FIG. 3, the rectangular projections of the heated upper heating section are pressed into the rectangular vertical grooves of the heated lower heating section into which two polyurethane elastic yarns to be joined are inserted in a superposed manner. And mated,
The groove width L ₄ length D ₂ -D ₁ length and the lower heating unit is a difference between the protrusion length D ₁ of the groove depth D ₂ and the upper heating portion of the lower heating unit, two of the polyurethane elastic yarn to be joined If the cross section of one polyurethane elastic yarn is assumed to be a perfect circle, it must be equal to or slightly smaller than the diameter calculated, or complete joining cannot be achieved. Of course, the protrusion width L ₃ of the upper heating portion is smaller than the groove width L ₄ of the lower heating portion, the gap is large, dissipation occurs in the heated air, reduced with mateable range as possible at invite a trouble in joining Need to be kept.

[0009] The temperature T ₂ ° C for heating the upper heating section and the lower heating section is ₅ ° C. lower than the processing temperature when the terminal section is deformed in advance.
℃ or higher, the adhesion temperature T ₀ ℃ of polyurethane elastic yarn
And the heating temperature T ₂ ° C are selected in the temperature range of T ₀ -80 <T ₂ <T ₀ -20, and the processing time is selected in relation to the processing temperature and is 3 to 60 seconds. The method of pressing the upper heating section against the lower heating section with the apparatus shown in FIG. 3 is not particularly limited as long as the method of the present invention can be achieved.

[0010]

EXAMPLES The present invention will be described in the following examples, but the present invention is not limited to these ranges. The density, the oil agent adhesion rate, and the adhesion temperature of the polyurethane elastic fiber in the examples were measured by the following methods, and the joining results were determined by the following methods. (1) The density is JISL1015-1981 7.1
According to the density gradient tube method of 4.2, carbon tetrachloride was used as a heavy liquid and toluene was used as a light liquid. (2) The oil agent adhesion rate was determined by a petroleum ether extraction method using a polyurethane filament yarn test method 6.10 established in October 1978, the Japan Chemical Fiber Association Technical Committee. (3) Measurement method of adhesion temperature Micro Melt manufactured by Yanagimoto Seisakusho shown in FIG.
ing PointApparatus, 60
Both ends of a polyurethane elastic yarn Y having a length of 0 ± 5 mm are hung on a pulley 12 which rotates freely. 2. A load W of (7/1000) g × denier is applied to both terminals. 3. Aluminum hot stage 5 is 2-3 ° C / mi
Heat with n. 4. A copper weight 6 having a diameter of 300 mm, a height of 27 mm, and a weight of 200.0 g was placed at the center of the hot stage 5 for 5 seconds, and the temperature of the hot stage 5 was lowered from about 30 ° C. lower than the adhesive temperature expected in a preliminary test in advance. The temperature was raised at a rate of 2 ° C./min, and a temperature close to the adhesive temperature of the polyurethane elastic yarn was measured. When the temperature of the hot stage 5 became close to the adhesive temperature, the polyurethane elastic yarn was weighted. Place under the weight so that it passes through the center of. In addition, hot stage 5
50mmφ outside diameter, 1.5mm thick, 24m high
m is provided. In addition, 8 is a thermometer. 5. The sticking temperature is determined by a finger of a thermometer mounted on the hot stage 5 when the polyurethane elastic yarn shows the sticking state between the weight and the hot stage 5 for a short time. 6. The result is obtained as an average of the measured temperatures of the five samples. (4) Judgment of joining 10c including the joining portion of the joined polyurethane elastic yarn
The m-length yarn was repeatedly stretched and relaxed four times by hand five times, and the yarn which was broken at the non-joined portion or before and after the joined portion was judged to be defective, and when the joint was sufficient and there was no abnormality, it was judged as good.

[0011] with respect to polytetramethylene ether glycol 5000 parts of Example 1 average molecular weight of 2,000, 4, 4 'diphenylmethane diisocyanate 1125 parts placed in a reaction vessel and 60 min the reaction was stirred under _{N 2} atmosphere at 80-90 ° C. After the prepolymer was prepared, it was diluted with 6215 parts of dimethylformamide to obtain a solvent-diluted prepolymer. 12628 parts of separately prepared dimethylformamide, ethylenediamine 1
A solution of 12 parts of diethanolamine and 14 parts of diethanolamine was added to the solvent-diluted prepolymer, and the mixture was stirred with stirring to obtain a viscous 25% polyurethane polymer solution.

The polymer solution was passed through a spinneret having 60 holes having a diameter of 0.12 mm by a wet spinning method.
Spun in hot water at 245 ° C, treated with a heat treatment machine at 245 ° C,
A 40 denier polyurethane elastic yarn could be wound up.
At this time, a polyurethane elastic yarn to which a finishing oil was attached by 5% before winding was designated as Sample 1, and a polyurethane elastic yarn to which no finishing oil was applied was designated as Sample 2.

The fineness of sample 1 was 844 denier, the density was 1.12, the adhesion temperature was 250 ° C., and the fineness of sample 2 was 83
The denier was 5 denier, the density was 1.12, and the sticking temperature was 250 ° C.

For each of the two polyurethane elastic yarns 10 cm long of the sample 1, the terminal portion 2 mm was placed on the lower heating section heated to 180 ° C. shown in FIG.
The upper heating unit was pressed against the lower heating unit heated to 0 ° C., and processed and deformed for 5 seconds. The heating temperatures of the upper and lower heating sections were measured with a Yamatake product name, K-thermocouple. Then, as shown in FIG. 2, 2 so long overlapping aligned polyurethane elastic yarn obtained by modifying each of the terminal portions of the present L ₁ is stacked so that the 15 mm. Length L ₂ is 30mm rectangular projections in this embodiment the upper heating unit of FIG. 3, D ₂ -D is the difference in projection height D ₁ of the groove depth D ₂ and the upper heating portion of the lower heating unit _One length is 0.32 mm, groove width L _{4 of} lower heating part
Using an apparatus having a length of 0.32 mm, the heating temperature of the upper and lower heating units was set to 180 ° C., and the above-mentioned sample was inserted into the rectangular vertical groove of the lower heating unit, and the upper heating unit was pressed. After treating for 30 seconds, the upper heating part was removed to obtain a bonded polyurethane elastic yarn. Similarly, a polyurethane elastic yarn bonded to Sample 2 under the same conditions as above was obtained. The judgment results of these joinings were pre-heated and pressurized .
The deformed portion was completely fusion-bonded, and was good without thread breakage.

Example 2 Using the polyurethane elastic yarn sample 1 obtained in Example 1, the end portion was deformed under the same conditions as in Example 1, and then the process was performed.
Both ends to be joined including the deformed portion of the book are aligned and overlapped by a length of 15 mm, and the heating temperature of the upper and lower heating sections is set to 170 ° C., 180 ° C., 20
0 ° C, 230 ° C, 240 ° C.
Judgment of bonding was performed by changing the time to 2, 3, 10, 30, 60, and 90 seconds, and the results are shown in Table 1-1.

[0016]

[Table 1-1]

In the same manner, the same procedure is performed for sample 2,
Table 1-2 shows the results of the joining judgment.

[0018]

[Table 1-2]

As is clear from the tables, when the heating temperature of the upper and lower heating sections was 170 ° C., the adhesion temperature of the polyurethane elastic yarn was 250 ° C., so the processing temperature was lower than the lower limit. If the temperature is lower, the thermal melting of the polyurethane elastic yarn is insufficient, and the bonding is incomplete and defective. or,
Even when the heating temperature of the upper and lower heating sections was 240 ° C. or more, the polyurethane elastic yarn partially melted, making it impossible to maintain the shape of the yarn, and the result was poor. The processing time at the processing temperature is 185 ° C. to 230 ° C.
However, at 1 second and 90 seconds, the joining portion of the yarn was defective. 1
In the range of 85 ° C. to 230 ° C. for 3 seconds to 60 seconds, the joint was good.

[0020]

According to the method for joining polyurethane elastic yarns of the present invention, when one wound body of polyurethane elastic yarn is joined to the next wound body, thermal joining is assured, and the yarn can be used at the joining portion of the yarn. It is possible to continuously supply yarn without any trouble that cutting will occur.If each end yarn of the wound body of polyurethane elastic yarn is joined in advance before use, it can also exert a great effect on labor saving. it can.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of an apparatus for deforming a terminal unit in advance according to one embodiment of the present invention.

FIG. 2 is a schematic view showing a state in which two elastic yarns are aligned according to one embodiment of the present invention.

FIG. 3 is a perspective view of a heating unit of the bonding apparatus according to one embodiment of the present invention.

FIG. 4 is a schematic view of an apparatus for measuring an adhesion temperature used in one embodiment of the present invention.

[Explanation of symbols]

1 upper heating unit 2 lower heating section 3 the upper heating section 4 lower heating unit 5 hot stage 6 weight 7 the outer peripheral cover 8 thermometer Y _1, Y _2, Y polyurethane elastic yarn

Claims (1)

(57) [Claims] 1. A yarn at the beginning of winding of a polyurethane elastic yarn wound body
End of the wound body of the wound body to be joined next to the end of
Parts previously heating and pressing treatment to form a deformed portion, then the
Ends of two polyurethane elastic yarns to be joined including deformed part
A method for joining polyurethane elastic yarns, wherein the ends are overlapped and heated and pressed.