JPH01226669A - Elastic thread bobbin body - Google Patents

Abstract

PURPOSE:To efficiently manufacture elastic products without deteriorating quality by setting the apparent elongation rate of an elastic thread in an elastic thread bobbin body and the adhesion quantity of the treating agent for the elastic thread so that a prescribed relation is obtained. CONSTITUTION:In an elastic thread bobbin body 3 which possesses the taking-up quantity of an elastic thread 2 made of polyurethane of at least 1.5kg and the ratio between the winding width A and winding thickness B, i.e., B/A of at least 0.4, the relation between the apparent elongation rate C% of the elastic thread 2 and the wt.% of the adhesion quantity D of treating agent such as oily agent shall be represented by the following equatilns:D-5<=C<=D+5, D<=2. The elastic thread 2 is pulled out from the elastic thread bobbin body (cheese) 3 and supplied into the necessary place on a cloth 1 such as the tigtening band, etc., for diaper cover, etc. Therefore, even in case of the high speed production of 100m/min or more, the generation of tension variation and thread cut is prevented, and the deterioration of the product quality is prevented, and the elastic products can be manufactured efficiently.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides good unwinding properties from the thread body, excellent shape retention of the thread body during processing steps, and adhesive bonding. This invention relates to an elastic thread body with good elasticity and a large amount of winding.

(Prior Art) Products using elastic systems have been widely used in many product fields that require stretchability, such as industrial materials, medical materials, and clothing materials.

Many of these products use elastic threads in the form of threads or in the form of fabrics such as woven or knitted fabrics, but when manufacturing these products, it is necessary to use spools wrapped with elastic threads. A necessary number of elastic threads are prepared, and the elastic threads are sequentially or in parallel supplied to the thread forming area or fabric forming area from the wound thread body.

[Problem to be solved by the invention]

However, in the conventional technology, the amount of yarn wound on the spool is small, and therefore the spool must be replaced frequently in the process of manufacturing necessary products, resulting in poor productivity and Every time the body was replaced, the quality of the product would become uneven, leading to an increase in production costs.

One of the possible reasons for this is that the elastic thread itself has elasticity, and it is difficult to manage the tension when wound onto the thread body.If the tension becomes too high, the inner layer is tightened, causing the thread to slip away from the thread body. There are drawbacks such as poor unwinding properties, easy thread breakage due to adhesion between threads, and lower tension causing thread layers to collapse due to slipping between threads. It has been difficult to increase the number of products, that is, to create large packages. In recent years, the production speed of products using elastic systems has been greatly improved, and the need for large packages of thread bodies is increasing.

On the other hand, in order to solve this problem, when the elastic system is set to a high tension and wound into a thread body, a large amount of treatment agent such as oil is applied to the elastic thread to reduce stickiness. However, with this method, when the elastic yarn is treated with an adhesive or other treatment agent in the processing step, there are problems in that the adhesiveness decreases or the treatment agent does not adhere to the yarn. Furthermore, in the conventional technology, the winding body of elastic thread had a small amount of winding and could not be made into a large package, so it was necessary to frequently replace the winding body during the production process.

That is, to explain an example of the process of simultaneously supplying a large number of elastic threads in line in the manufacturing of disposable diapers based on FIG. 2, the plurality of elastic threads 2 are A corresponding number of winding threads, for example cheese 3, are wound in a slightly stretched state. The cheese 3 is rotatably placed on a drive roller (not shown), and as the drive roller rotates, the elastic threads 2 are pulled out from the cheese 3 and supplied to required locations on the fabric 1. In the above manufacturing process, each time the elastic thread 2 of each cheese 3 is consumed, it is necessary to stop the process and replace the cheese. 1. The amount of rolls is small (1.3), which means that the process must be stopped frequently and the cheese must be replaced frequently, causing a significant loss in production efficiency.

In order to solve this problem, we investigated cheeses with a large amount of rolling. However, when the amount of rolling is 1.5NrJ or more and the ratio of the width of the roll to the thickness of the roll is 0.4 or more, especially the inner layer It has been found that as the elastic yarn progresses, the unwinding property of the elastic yarn from the cheese deteriorates, and yarn breakage becomes more likely to occur due to adhesion of the yarns to each other.

In this case, in order to improve the unwinding property, the elongation rate when winding the elastic thread around the cheese is lowered to make the cheese soft, and the cheese is placed on the drive roller described above. It has been found that during high-speed unwinding and thread removal, the cheese deforms and collapses, causing the threads to become tangled, which causes thread breakage as described above.

This drawback has become a common problem when speeding up the manufacturing process of other products.

The object of the present invention is to improve the above-mentioned drawbacks of the prior art, and to provide an elastic yarn wound body with a large amount of windings, which has good unwinding property of elastic yarn from the wound body and excellent shape retention of the wound body. In addition, we have created an elastic bobbin thread body that is easy to handle during the production process, does not cause tension fluctuations or thread breakage even during high-speed production, and can efficiently manufacture elastic products without degrading product quality. This is what we provide.

[Means to solve the problem]

The elastic yarn wound body according to the present invention is configured as follows in order to achieve the above-mentioned object. That is, the amount of thread winding is 1.
Ratio B/A of winding width A and winding thickness B for 5Kg or more
is 0.4 or more, and the apparent elongation rate C (%) of the elastic system in the thread is 0.4 or more.
The elastic thread body is characterized in that the amount D (weight %) of the treatment agent applied to the elastic thread is in the following relationship: D-5≦C≦D+5 D≦2.

The structure of the elastic thread-wound body of the present invention will be explained in detail below.

The elastic threads used in the present invention are polyester-based, polyether-based, polyurethane elastic threads, polyester elastic threads, polyamide elastic threads, or composites or mixtures of these with other organic synthetic resin bodies. Elastic thread, etc.

In addition, the fields of application of the thread body in the present invention are partly as described above, but in more detail, covering yarns, core spun yarns, plied and twisted yarns, stretch fabrics in general, base fabrics for pile fabrics, tricots, raschels, etc. Warp knitted fabrics, socks, tights, etc., braided fabrics, or supporter 1
Bandages, tightening belts such as diaper covers, etc. can be considered.

As mentioned above, the present invention is suitable for increasing the production speed of elastic products, prevents yarn loss, and makes it possible to form a large spool package without significantly changing the width of the package compared to the conventional one. This makes it possible to improve the unwinding properties of elastic yarns, prevent yarn breakage and uneven unwinding tension, and improve product quality.

Moreover, this also makes it possible to significantly reduce the production cost of elastic products.

The inventors of the present invention conducted various experiments on the characteristics of the elastic yarn wound body in accordance with the above-mentioned purpose, and as a result, as mentioned above, the apparent elongation rate C (%) of the elastic yarn wound body and the attached It has been confirmed that by regulating the amount of oil deposited in a specific relationship, it is possible to obtain a large-packaged elastic thread body that meets the above-mentioned purpose.

In the present invention, the apparent elongation rate of the elastic yarn in the wound yarn body is measured by the following procedure and method.

1) A line R is marked on the surface of the outer layer of the elastic thread body 3 to be measured in a direction parallel to the central axis of the winding core body E using an appropriate marking material.

2) Next, place the wound body horizontally on a table 5 having a flat surface, and after taking out the yarn tip 6, unwind the elastic yarn 2 while gently rolling the wound body on the table 5. Then, at the point where the first marked portion P appears, a suitable portion of the elastic yarn on the yarn opening 6 side from that portion is fixed onto the table 5 with an adhesive tape 7.

3) Unwind the elastic thread by gently rolling the thread body again, and when the marked part Q of the thread comes out, roll the appropriate part of the elastic thread closer to the thread body than that part. is fixed on the stand 5 with an adhesive tape 8, and the elastic thread between the fixed part and the wound body is cut.

4) Next, measure the length gl between marks P and Q of the thread fixed on the table.
Measure.

5) Next, remove the elastic thread from the stand 5, fix its - end to the clip 9 of the suspension device as shown in Figure 4, and apply a load W equivalent to 0.0002 (J/denier) to the other end. Attach, hang, and leave at room temperature for 1 minute.

6) Next, mark P attached to the elastic thread in that state
, Q opening length, l! Measure 2.

7) The apparent elongation rate C is calculated using the following formula.

Furthermore, in the measurement of the apparent elongation rate C in the present invention, the system to be measured is the yarn in the outer layer of the spool, but the term "outer layer" here naturally includes the outermost layer of the spool. However, if the elastic yarn is unwound to the outermost layer until the weight of the yarn is reduced by half compared to the yarn amount of the unused yarn body, from which layer is the elastic yarn sampled? Good too.

Next, the adhesion rate of the processing agent in the present invention is measured by the following method.

1) After leaving the thread in a room at 20° C. and 65% RH for 24 hours, 3 g of elastic material is taken from the thread in the room and its weight ff1W1 is accurately measured.

2) Next, this yarn is left in a dryer at 105° C. for 1 hour, cooled in a desiccator, and then the weight W2 of the yarn is accurately measured.

3) Next, calculate the moisture content R of the yarn using the following formula. 4) Separately, accurately measure the weight W2 of 2 g of the elastic yarn wetted above.

5) Next, put this thread into a 200 d Erlenmeyer flask with a stopper, add 100 d of petroleum ether, and let it soak at room temperature for 10 minutes while stirring vigorously.

6) Next, the thread is taken out and the same operation is repeated at the same room temperature using fresh petroleum ether.The hind limb thread is air-dried to remove the petroleum ether.

7) Process the hindlimb threads in a 1 ooi boiling water bath for 5 minutes.

8) The treated hindlimb yarn was left in a dryer at 105° C. for 1 hour and cooled in a desiccator, and the weight W4 of the hindlimb yarn was measured.

9) Next, calculate the treatment agent adhesion amount D@ using the following formula.

Note that the position of the elastic system sampled for measurement is the same as the sampling method used in the measurement of the elongation rate described above.

Note that the treatment agent in the present invention includes a yarn treatment agent that is compatible with the purpose of the oil agent soaking invention.

Furthermore, the winding width A in the present invention is measured at the maximum width of the thread body as shown in Fig. 1, and the winding thickness B is measured at the height from the lowest layer to the outermost layer of the yarn layer. It is something to do.

The wound body in the present invention includes those in the form of a cheese, a drum, and a bobbin.

An example of the elastic thread-wound body according to the present invention is shown in FIG. In FIG. 1, the winding body 3 has elastic yarn wound on a paper tube E, with a winding weight of 1.5 kg, and the diameter F of the paper tube is 8.
31flh The winding width A is 104 m, and the winding thickness B is 60 shoes. Therefore, B/A is 0.58.

In a conventional wound body of elastic yarn, the amount of yarn wound is 1.
Normally, B/A is 0.5 or less for 1Kg or less, and it was technically impossible to wind it for more than 1Kg, but in the present invention, 1.5
υ or more preferably 3. Since it is possible to make the B/A ratio 0.4 or more, preferably 0.5J, or above 4, with a spool body with a spool volume of OK9 or more, the spool volume can be increased without increasing the winding width that much. It is possible.

Next, the relationship between the elongation rate (C) and the oil adhesion rate (D>) required for the above-mentioned large packaging in the present invention will be explained. Because the elastic thread is wound around the spool in this state, the elastic thread contracts on the spool, hardening the spool itself, and the elastic threads also stick to each other or fit together and unravel. It's making sex worse.

For this purpose, it may be possible to use a large amount of oil or the like to reduce the stickiness between the threads and improve the unwinding property, but in that case, there are drawbacks such as poor adhesion and other problems in post-processing. Ta.

On the other hand, it is conceivable to wind the elastic thread with less elongation when manufacturing the thread body, but in that case, the thread layers are likely to collapse.

In view of these problems, the present invention has achieved large packaging by reducing the amount of processing agents such as oil as much as possible and by winding the yarn in a soft manner.As mentioned above, the conditions for this are as follows: The relationship between the apparent elongation rate C (%) of the yarn and the amount D (weight %) of the treatment agent applied to the elastic system is as follows: D-5≦C≦D+5 D≦2.

If the apparent elongation rate C (%) of the elastic system in the cheese is larger than the adhesion amount D+5 of the oil agent attached to the surface of the elastic thread, the adhesion between the elastic threads in the cheese becomes large and the elastic product During the manufacturing process, thread tension becomes poor and thread breakage occurs frequently.

On the other hand, if C is smaller than D-5, the cheese will be wound softly, and the shape of the cheese will tend to collapse when spinning at high speed on the drive roller during the same manufacturing process. This will still cause thread breakage. Therefore, it is necessary to control the value of C within the range of the above formula, and a preferable range of C is D-3≦C≦D+3.

On the other hand, the oil adhesion amount D (weight%) is 2 or more, and C is 71
When it is set above X, it is possible to form a cheese that has good unwinding properties and whose cheese shape does not easily collapse even if it is rotated at high speed on the drive roller. However, in this case, there are too many oil valves on the thread surface, which can become an obstacle when aligning with other threads, performing post-processing such as dyeing, or even when adhering the elastic thread to other materials. However, there is a problem in that the elastic system tends to peel off, especially when adhesively bonded. Therefore, the oil adhesion 10 <wt%) needs to be 2 or less.

Adhesion is possible if the value of D is 2 or less, but a more preferable range of D is D≦1.

The oil agent in this case is not particularly limited, but for example, it may be applied to polyurethane elastic systems for the purpose of preventing adhesion and improving high-order processability, such as dimethylpolysiloxane. , a modified polysiloxane in which a part of the methyl group is substituted with other alkyl groups, phenyl groups, amino groups, etc., oil agents mainly composed of mineral oil, etc. can be used.

Further, the elastic thread applicable to the present invention preferably has a denier of 280 to 1120. The length of the cheese paper tube is 11-1
2CI11 is suitable.

(Function) The elastic thread-wound body according to the present invention is a multi-wound elastic thread-wound body that has good unwinding property of the elastic thread from the winding body and excellent shape retention of the winding body, and includes: Moreover, it is easy to handle during the production process, and is more than 50 m/min, preferably 100 Trt/min.
Even if high-speed production is performed over a minute or more, there will be no tension fluctuation or thread breakage, and elastic products can be efficiently manufactured without deteriorating product quality.

Furthermore, the thread body according to the present invention can be applied to all fields,
Not only is it possible to cope with higher speeds, but there are fewer troubles during the production process, and the number of replacements of thread bodies can be reduced, resulting in a significant reduction in production costs.

Furthermore, when the wound body according to the present invention is used particularly in the process of manufacturing disposable diapers, the large amount of winding prevents frequent cheese replacement work, and reduces the amount of oil adhering to the surface of the elastic yarn.
Since the relationship with the apparent elongation rate C of the elastic system in the cheese is controlled within a specified range, the threads stand up well in the disposable diaper manufacturing process, and the cheese retains its shape well, so thread breakage is avoided. In addition, since the oil content is as low as 2% or less, the adhesiveness between the elastic yarn and the paper diaper sheet material is good, and problems such as peeling are unlikely to occur.

〔Example〕

Specific examples of the present invention are shown below as examples, but the present invention is not limited to these examples.

Example 1 10 parts of 4,4'-diphenylmethane diincyanate was added to 40 parts of polytetramethylene ether glycol with a molecular weight of 2000 having hydroxyl groups at both ends to perform a prepolymer reaction, and then dissolved in dimethylformamide. After that, 1 part of hydrazine hydrogen chloride and 0.05 part of diethylamine were added to carry out chain extension and end-terminating reactions, thereby obtaining a polyurethane solution having a viscosity of 1800 voices at a polymer concentration of 30%.

This polyurethane solution was extruded from a spinneret into a spinning tube in which heated air at 220°C was flowed, and was dry-spun to a length of 1.
15am+, a paper tube with an outer diameter of 83#I and a winding width of 101mm. Winded with 840 denier polyurethane elastic thread cheese 1.5
To! I made cheese of j. In this case, no oil was applied (D=O%).

At this time, by adjusting the spinning speed, winding speed, and winding angle on the cheese, seven types of cheese were obtained in which the apparent elongation rate of the elastic threads within the cheese was varied from -7 to +7.

Next, these cheeses were applied to the production of disposable diapers in which elastic threads were arranged and glued in a stretched state on both side leg parts to prevent leakage, as shown in Fig. We supplied multiple Mizuhiki. The yarn speed of the yarn feeding device for the elastic yarn was 100 TrL/min.

In this elastic yarn feeding device, a cheese is placed on two drive rollers placed horizontally and in parallel, and the cheese is forcibly rotated while the elastic yarn is fed out at a constant speed. The test results are shown in Table 1.

However, *1: Number of thread breakages caused by thread adhesion *2: Number of thread breakages caused by cheese shape collapse Example 2 Dry spinning was performed in the same manner using the polyurethane solution of Example 1, and the same length was obtained. 11511111. A cheese of 1.5 kg of 560 denier polyurethane elastic yarn was produced by winding it around a paper tube having an outer diameter of 83#I with a winding width of 104 M. The oil agent used had components of 98% liquid paraffin and 2% calcium stearate, and had an average adhesion of 1%. At this time,
Seven types of cheese were obtained by adjusting the spinning and winding conditions to change the apparent elongation rate within the cheese from -6 to +8.

These cheeses were then subjected to the same test as in Example 1.

The results of the test are shown in Table 2.

However, *1: Number of thread breakages caused by thread adhesion *2: Number of thread breakages caused by cheese shape collapse Example 3 840 denier polyurethane elasticity was obtained using the same method as in Example 1 without attaching any oil. A total of 3.0 kg of cheese was prepared.

The shape of the cheese in this case is a roll width of 102jw+ and a roll thickness of 9
9M, and the apparent elongation rate of the elastic system within the cheese is the average of the values measured from the outer layer of the cheese and the layers until the yarn weight reaches 1/2 of the initial weight (n = 10> is +
It was 2.5%.

A total of 10 cheeses, 5 each, were attached to a paper diaper manufacturing machine, and paper diapers were manufactured at a rate of 300 sheets per minute. In this case, the thread pulling speed from the cheese is 60771.
/minute.

Continuous operation for about 9 hours was possible until the cheese was completely consumed down to the inner layer, but during this time not a single thread broke, and even in the manufactured disposable diapers, the polyurethane elastic threads were evenly bonded. No quality problems were observed.

Example 4 Using the polyurethane solution of Example 1, dry spinning was carried out in the same manner as in Example 1, and a paper tube having a length of 230 m and an outer diameter of 83 shoes was wound with a winding width of 215 ag.
560 denier polyurethane elastic thread 6N
g cheese was made. In this case, the oil did not adhere. At this time, seven types of cheese were obtained by adjusting the spinning and winding conditions to change the apparent elongation rate within the cheese from -7 to +7.

These cheeses were then tested using the same equipment as in Example 1.

The test results are shown in Table 3.

However, *1: Number of thread breakages caused by thread adhesion *2: Number of thread breakages caused by cheese shape collapse [Effect] An elastic yarn wound body with a large amount of winding, which has good unwinding properties and excellent shape retention of the wound body, and is easy to handle during the production process, and is preferably 50 TrL/min or more, preferably 100 m
Even if high-speed production is performed at speeds of 1/min or more, elastic products can be efficiently manufactured without tension fluctuation or thread breakage, and without deteriorating product quality.

In addition, the spool according to the present invention can be applied to all fields and can not only handle high speeds, but also has fewer troubles during the production process and fewer replacements of the spool, resulting in a significant reduction in production costs. sell.

Furthermore, when the wound body according to the present invention is used particularly in the process of manufacturing disposable diapers, the large amount of winding prevents frequent cheese replacement work, and reduces the amount of oil adhering to the surface of the elastic yarn.
Since the relationship with the apparent elongation C of the elastic threads in the cheese is controlled within a specified range, the threads stand up well in the disposable diaper manufacturing process, and the cheese retains its shape well, so thread breakage is avoided. (Also, since the oil content is low at 2% or less, the adhesive between the elastic thread and the paper diaper sheet material is good, causing problems such as peeling.)

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an elastic thread-wound body according to the present invention. FIG. 2 shows an embodiment in which elastic yarn is supplied to a fabric manufacturing process. FIGS. 3 and 4 are diagrams illustrating a method of measuring the apparent elongation rate of elastic yarn in the present invention. FIG. 5 is a schematic plan view of a conventionally known disposable disposable diaper in which a plurality of elastic threads are arranged and bonded to both side leg portions in an aligned manner. Patent applicant: Azuma DuPont Co., Ltd.
Person AfL Rerito Hisatari Procedural Amendments Showa No. 697.1-2, Title of invention Elastic thread-wound thread body 3, Relationship to the case of the person making the amendment Patent applicant address 1-5 Nihonbashi Honmachi, Chuo-ku, Tokyo number 6 name
Name: Yoshi Nakayo, Representative Director and President of DuPont Co., Ltd. 4, Agent 6, Number of claims increased due to amendment: 063.7°
;,; \4 is also i. ＼-1・Attachment 8 Claims (1) An elastic thread body having a thread winding amount of 1.5 kg or more and a ratio B/A of winding width A to winding thickness B of 0.4 or more. Therefore, the apparent elongation rate C (%) of the elastic yarn in the yarn body and the amount D (weight %) of the treatment agent attached to the elastic yarn have a relationship of D-5≦C≦Dando5 D≦2. An elastic thread-wound body characterized by: (2) The elastic thread-wound body according to claim 1, wherein the ratio A/B of the winding width A to the winding thickness B is 0.5 or more. (3) The elastic thread-wound body according to claim 1, characterized in that the amount of thread wound on the thread is 3 kg or more. (4) The elastic thread body according to claim 1, wherein the elastic system is a polyurethane elastic thread.

Claims (4)

[Claims] (1) An elastic thread body having a winding amount of 1.5 kg or more and a ratio B/A of winding width A to winding thickness B of 0.4 or more, wherein the elastic yarn in the winding body is An elastic thread-wound body characterized in that the apparent elongation rate C (%) of the elastic thread and the amount D (weight %) of the treatment agent attached to the elastic thread have a relationship of D-5≦C≦+5 D≦2. (2) The elastic thread-wound body according to claim 1, wherein the ratio A/B of the winding width A to the winding thickness B is 0.5 or more. (3) The elastic thread body according to claim 1, characterized in that the amount of the thread wound is 3 kg or more. (4) The elastic thread-wound body according to claim 1, wherein the elastic thread is a polyurethane elastic thread.