JPS5943121A - Preparation of synthetic fiber for blow molding - Google Patents

Abstract

PURPOSE:To obtain the titled fiber having feeling like down, drapeability, heat retaining properties, and bulkiness, by subjecting repeatedly specific crimped tow to relaxation and stretch in the length direction, opening it in an intermeshed gear state, cutting it to a specific length, separating it by compressed air, opening it. CONSTITUTION:The crimped tow 1 having <=3 denier of single yarn and <=0.30 static coefficient of friction between yarn is subjected to heat setting by the heat setting machine 2, fed through the guide rollers 5 to a series of tow transfer rollers 6, 8, and 10, subjected repeatedly relaxation and stretch by a pair of the first opening rollers 7' and 7'' set between 6 and 8 to produce variation in tension, opened by a pair of the opening material 9 in an intermeshed gear state set between the rollers 8 and 10, cut to <=200mm. fiber length by the cutter 3, compressed air is blown from the air nozzle 12 to it, so that it is separated and opened to give the desired fiber 4.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing synthetic fibers for blow molding that have a down-like feel, drape properties, heat retention properties, and bulk properties.

Bird feathers have traditionally been used for various fillings.

However, natural feathers have problems such as quantitative limitations, complex manufacturing processes, uneven quality, and high price, making it difficult to use them for a wide range of purposes. There has been an increasing demand for filling materials with the following characteristics. The feathers used for various fillings are made up of small feathers obtained from the wing parts of waterfowl and down obtained from the breasts. Products with a higher proportion of down are softer and have better drape, and are bulkier and more expensive. It is treated as.

The present invention relates to a method for producing synthetic fibers for blow molding having downlike flexibility, bulkiness, and heat retention.
The object of the present invention is to provide a method for producing synthetic fibers that can be easily blown directly onto side fabrics using a blow molding machine used for feathers.

Various methods for producing feather-like synthetic fibers for blow molding using synthetic fibers have already been proposed.

For example, Japanese Patent Publication No. 52-28426, No. 57-50
As shown in Publication No. 308, the method of modifying ordinary fibers by attaching silicone thread oil to them can certainly improve drape properties slightly, but the bulk is insufficient, the texture is completely different from that of feathers, and the compression recovery properties are poor. You can only get what is scarce. Furthermore, as shown in Japanese Patent Publication Nos. 48-7955 and 57-39134, the method of making the fiber aggregate state spherical or radial is certainly unique in terms of morphology, but it does not satisfy the characteristics of feathers. It is not.

In addition, if fine denier staple fiber with a low coefficient of friction is used as a synthetic fiber, as shown in JP-A No. 56-141206, it is possible to create stuffed cotton with a soft texture, excellent heat retention, and excellent drape properties. known to be obtained.

Synthetic fibers with a fine denier of 3 denier or less and a low coefficient of friction provide a town-like feel, heat retention, and drape properties, but the smaller the single yarn fineness, the more difficult it is to spread in the synthetic fiber manufacturing process. becomes worse. That is, the synthetic fiber itself contains many unopened fiber portions of the scallops, resulting in a low bulk fiber. Therefore, if you try to directly blow fine denier synthetic fibers into the side fabric using a blow-molding machine (stuffing machine) for natural feathers, the synthetic fibers may wrap around the blower fan or clog the blower or duct. Unable to proceed with work smoothly. Even if you manage to proceed with the stuffing process, the synthetic fibers stuffed into the side fabric will not be fully opened and will have a low bulk, and will form lump-like fiber clumps, resulting in unevenness on the stuffing surface. The unevenness is not preferable because it impairs the quality of the textile product and also impairs its feel when worn, giving it a sense of discomfort.

Strictly considering the spreadability, there are two definitions.

(1) Uniform spreadability: When there are parts in the fiber aggregate where single fibers form a cluster and become scallop-shaped, and parts where single fibers are separated from each other, and the ratio of the latter is high. It is said that the uniform opening property is good.

(2) Bulky and spreadable properties: Uniform spreadability in fiber aggregates is poor. In other words, although there are relatively many scallop-shaped collective fibers, the scallop-shaped collective fibers and a large number of separated single fibers are randomly dispersed. When it comes to bulk, it is said that bulk and spreadability are good.

In addition, if the uniform spreadability is good, the bulky fiber spreadability also tends to be good.

In the present invention, the opening rate is defined by the following equation as a measure of uniform opening property.

Spreading rate (%) = (total fiber amount (g) - scalloped collective fiber amount (
g))/total fiber amount (g)×100 As a measure of bulkiness and spreadability, the present invention employs the unloaded bulk after unpacking, which will be described in detail below.

According to the study results of the present inventors, the workability of the blow molding machine is good and the obtained filling has good bulk when both the uniform spreadability and the bulky spreadability are high.

In the conventional manufacturing method of synthetic fibers, the spun raw yarn is generally combined into a tow of 100,000 to 3,000,000 denier, which is stretched at an appropriate stretching ratio, then an oil agent is applied and crimped. After that, the crimping heat is fixed and the fibers are immediately cut into staple fibers, which are packed in bales.

In such conventional synthetic fiber manufacturing methods, the single yarn fineness is 3.
There is a limit to obtaining synthetic fibers with a denier or less that have a high opening rate and are bulky. For example, after cutting the tow, an attempt is made to forcefully blow compressed air with an air nozzle to open the staple fibers, but no matter how high the compressed air pressure is, it has little effect.

By the way, even if staple fibers are made into staple fibers and then transported by air tact to the packaging process, they are hardly separated and opened.

(The bulkiness and spreadability do not improve.) Furthermore, in order to obtain a more down-like soft texture, increasing the amount of the oil agent that makes the tow flexible causes the single yarns to stick to each other due to the adhesive force of the agent itself and spread uniformly. make sex worse. In addition, increasing the crimp performance to an extreme degree in order to improve the bulkiness of the filler also deteriorates the uniform opening property.

As mentioned above, in conventional synthetic fiber manufacturing methods, when synthetic fibers with a single filament fineness of 3 denier or less and treated with a treatment agent are used, it is difficult to blow with a normal feather blow molding machine, or even if blowing is possible. Only low bulk fillings were obtained.

The purpose of the present invention is to improve the above-mentioned drawbacks, and to provide a synthetic fiber having a single yarn fineness of 3 denier or less and treated with a softener, it has excellent blow moldability, is extremely bulky and flexible, has excellent heat retention,
An object of the present invention is to provide a method for producing synthetic fibers for blow molding with good drape properties.

In other words, the present invention provides a process and a gear for repeatedly loosening and tensioning a heat-set crimped tow with a single yarn fineness of 3 denier or less and a coefficient of interfiber static friction of 0.3 or less in at least the length direction of the tow to cause tension fluctuations. Synthetic fibers for blow molding, characterized in that the fibers are spread through interlocking spread bodies, and then cut into fiber lengths of 200 mm or less, and then immediately blown with compressed air to separate and spread the fibers. ``Production method''.

The synthetic fibers used in the present invention may be polyester-based, acrylic-based, polyamide-based, polyolefin-based, etc., but polyester-based synthetic fibers are most preferred from the standpoint of bulkiness.

The single yarn fineness is preferably 3 denier or less, particularly 1 denier or less, in order to approximate the soft feel, drape properties, and heat retention properties of downlike fabrics.

The single yarn fineness is 0.0 to increase the bulk and heat retention of the filling.
It is a preferable embodiment to use a mixture of different denier fibers, which are a substantially uniform mixture of 0.01 to 0.5 denier fibers and 0.5 to 3 denier fibers in a ratio of 20:80 to 80:20.

From the point of view of spreadability, the cross-sectional shape of the fibers may have one or more protrusions on the side surface of the fibers, so as to easily cause misalignment between the fibers when the tow is spread. Those with a cross-sectional shape are preferable, and those with a high degree of irregularity are more preferable. Further, in order to improve both heat retention and bulkiness, hollow fibers having a non-circular cross-sectional outer periphery with a hollowness ratio of 3 to 45% are more preferable. For example, Figures 4 to 8, Figure 10,
Figure 22 etc.

When opening the tow using hollow fibers as described above, the cross-sectional shape of the fibers is greatly deformed by external force, making it easier to open the tow.

The method for measuring the coefficient of static friction between fibers (hereinafter referred to as μs) is based on JISL-1074, and the smaller the value, the better the smoothness between the fibers.

In the present invention, when μs is 0.30 or less, the opening property during tow opening is good, and the resulting fiber has a down-like and extremely soft texture. If μs exceeds 0.30, the opening performance during tow opening will deteriorate, and at the same time, the texture of the resulting fibers will also be poor, which is not preferred. In order to make μs 0.30 or less, it is preferable to treat with a surface treatment agent mainly composed of silicone resin.

Specific examples of silicone resins whose main component is silicone resin include methylhydrodiene polysiloxane, which reacts and cures on the fiber surface to form a film, epoxy group-containing polysiloxane, amino group-containing polysiloxane, oxyalkylene group-containing polysiloxane, methylvinylpolysiloxane alkoxypolysiloxane and mixtures thereof,
Reactive organopolysiloxane-based materials in which a crosslinking agent such as aminosilane is mixed with these materials are preferred. These can be applied in the form of solutions or emulsions. Since silicone resins usually have poor antistatic properties, a small amount of cationic or anionic surfactant is added to impart antistatic properties.

The amount of the treatment agent containing silicone resin as a main component is preferably 0.1 to 3% based on the dry weight of the fibers. 0.
If the amount is less than 1% by weight, downlike flexibility cannot be imparted as described above.

Further, even if it is added in an amount exceeding 3.0% by weight, the smoothness and flexibility will not improve much.

The tow treated by the method of the present invention is crimped 8
It is a crimped tow heat-set at 0°C or higher. As for the crimp performance of the crimped tow, it is desirable that the number of crimp is 5 crimp/25 mm or more and the degree of crimp is 5% or more.

It is preferable that the number of crimps is 5 crimp/25 mm or more because bulkiness and compression recovery properties are excellent, and the degree of fibers coming out from the side fabric while wearing the stuffed product is small, and the amount of ventilation in the side fabric is relatively high. It is possible and preferred to use a large, open lining, ie an inexpensive lining. The method of the present invention can be used even when the number of crimps is less than 5 crimps/25 mm, but the bulkiness and compression recovery properties are slightly reduced due to the small single yarn fineness.

If the degree of crimp is less than 5%, the bulkiness and compression recovery bulkiness of the filler will not reach a sufficiently satisfactory level. It is preferable that the degree of crimp is 5% or more because good bulkiness and compression recovery properties can be obtained.

The crimp form can be a zigzag-like flat crimp using the push-in winding method, a three-dimensional crimp that gives anisotropy to the fiber cross section and develops latent crimp through composite spinning or asymmetric cooling spinning, or a mixture of both. good.

Next, it is necessary to repeatedly relax and tension the thermally identified crimped tow to produce tension fluctuations, and this relaxation and tension may be applied in the length direction and width direction of the tow, but at least in the length direction. need to be applied.

For example, as a specific example, a pair of rollers that rotate faster than the tow feeding speed is provided between a pair of feed rollers that rotate at approximately the same speed and a pair of take-up rollers, and at least one of the rollers is cut along the axis. A method may also be used in which a cut roller is used to alternately apply tension and relaxation to the tow (Japanese Utility Model Publication No. 14169/1983).

In order to spread the crimped tow, it is possible to effectively spread the fibers by adding a method of rubbing the fibers with a fiber spreader having an edge and meshing with each other like a gear to the above method. In other words, between a pair of feed rollers that rotate at approximately constant speed and a pair of take-up rollers, a fiber opening body that has a pair of edges that rotate faster than the tow feeding speed and meshes like a gear is provided. This method involves abrasion and opening. The width of the opened tow is about three times the width of the tow before opening, and it is once gathered and cut. The method for cutting the tow may be any method such as a circle cutter or a guillotine cutter. The cut length (fiber length) is preferably 200 mm or less. Especially 20-76mm
is preferred. If it exceeds 200 mm, blow moldability deteriorates, causing troubles such as winding around the near blower fan, which is undesirable.

When using ordinary synthetic fibers with a single denier fineness of 4 to 8 denier, practical blow moldability cannot be obtained unless the fiber length is 35 mm or less, but in the present invention, despite the fine denier of 3 denier or less, Blow molding is possible even if the fiber length is increased to 200 mm. Fibers cut to a length of 200 mm or less are immediately separated and opened by compressed air sprayed from a nozzle.

As mentioned above, even if it is attempted to sufficiently open ordinary crimped short fibers having a fineness of 3 deniers or less using only this compressed air, it is impossible. At least by repeating relaxation and tension in the length direction of the tow to produce tension fluctuations and passing it through a tow opening device, a high degree of separation and separation that cannot be achieved with conventional methods can be achieved.
This makes it possible to open the fibers. Furthermore, in order to randomize the direction of the tow-opened and cut synthetic fibers and create a bulkier filling, separation by compressed air blowing immediately after cutting is performed.
Opening is required.

The method of the present invention will be explained below based on the drawings.

FIG. 1 shows a conventional cotton manufacturing method after the tow crimping step. The crimped tow 1 is heat-set by a heat treatment machine 2 and then cut into staple fibers 4 by a cutter 3. FIG. 2 is a schematic side view showing an outline of one embodiment of the manufacturing apparatus according to the present invention.

In FIG. 2, the crimped tow 1 is heat-set in a heat treatment machine 2 and then fed through a guide roller 5 to a series of tow gripping and transferring rollers 6, 8, 10. A pair of rollers 7 (this pair of rollers will be referred to as first opening rollers) is provided between the rollers 6 and 8. One is a cut roller 7 and the other is a regular roller 7''. 3 denier. Fibers with irregular cross-sections having the following finenesses, especially those with protrusions on the outer periphery, such as the cross-sections shown in Figures 3 to 22, are relatively easy to spread because the contact area between the fibers is small and shearing is likely to occur. is good, and when synthetic fibers with such a cross section are used, the first fiber opening roller 7 and the gripping and transferring roller 6 described above are
, 8 can provide good fiber opening to some extent.

In addition, hollow cross-section fibers are preferred because the cross-section easily deforms during expansion and contraction, making it easier to spread the fibers evenly. The circumferential speed of the first opening roller is the tow transport speed, that is, the rollers 6 and 8.
The peripheral speed is normally set to be 1.5 to 7 times faster than the circumferential speed.

When the crimped tow is temporarily held between the non-cut surface of the cut roller 7' and the ordinary cylindrical roller 7'', the crimped tow between the roller 6 and the first opening roller 7 becomes in tension. , the first fiber opening roller 7 and roller 8 are in a relaxed state.

Also, the cut surface of the cut roller 7' and the ordinary roller 7
'', the crimp tow is temporarily not gripped, so the entire crimp tow from roller 6 to roller 8 is in a relaxed state.As a result of this repeated tension and relaxation, the crimp tow also moves in the direction of the tow width force. The fibers are spread wider and more uniformly.

In FIG. 2, for fibers with a circular cross-section yarn having a single filament fineness of 3 deniers or less and no protrusions, it is sufficient to spread the fibers using only the first spreading roller 7 and the gripping and transferring rollers 6 and 8. Since this is not done, the gripping transfer roller 8
, 10, it is necessary to provide a pair of opening bodies 9 (this pair of opening bodies will be referred to as a second opening roller) which have a plurality of edges between them and mesh like gears.

The rotational speed of the edge tip of the second opening roller is usually 1.5 to 1.5 times higher than the tow transport speed, that is, the surface speed of the rollers 8 and 10.
It is set to be 7x faster. Therefore, the crimped tow is spread by being rubbed by the gear tip. In this way, the crimped tow 1 is further fully opened by the second opening roller 9. The shape of the edge part may be any shape, such as a trapezoid as shown in Figure 24, as long as it can rub against the tow without damaging the fiber itself, a rust shape, a trapezoid as shown in Figure 25, etc., but the corners are as shown in Figure 26. It is preferable to make the tow slightly rounded as shown in FIGS. 27 and 28 because it allows the tow to pass through smoothly and prevents fuzzing due to single yarn breakage.

As mentioned above, even if the first fiber-spreading roller generates a tension variable axis and then the second fiber-spreading roller rubs the fibers, the second fiber-spreading roller performs the fiber-spreading process and then the first fiber-spreading roller or in this order. A similar fiber-opening effect can be obtained by reversing this and applying repeated tension and relaxation.

The tow opened in this way is bundled through a roller 10, supplied to a cutter 3, cut into desired fiber lengths, and separated by an air nozzle 12 provided near the cutter.
The fibers are opened. The separation and opening by the air nozzle 12 is easy because the short fibers have been first opened by the first opening roller 7 and the second opening roller 9.

For example, a crimped tow with a crimp count of 5 or more per inch and a crimp rate of 5% or more becomes cotton with an open weave rate of 80% or more according to the method of the present invention.

Therefore, the unloaded bulk of the cotton treated by the method of the present invention after unpacking is 35 cm3/g or more, which is extremely bulky, and the permeability in the blow molding method is extremely good when a normal blowing machine is used. The filling has excellent bulk, drapability, heat retention, and texture, and has properties similar to high-quality natural feathers, which are made of 20% or less small feathers and 80% or more down.

The synthetic fiber obtained by the method of the present invention can also be used in combination with feathers. In the method of the present invention, known moisture-absorbing, water-absorbing, flame-retardant, stain-proofing treatments, etc. may be applied before heat-setting the crimped tow, or after heat-setting and opening the crimped tow.

Hereinafter, the present invention will be specifically explained with reference to Examples.

Example 1 Polyethylene terephthalate having an intrinsic viscosity (I.V) of 0.65 when dissolved in O-chlorophenol and measured at 25°C was prepared with a yarn cross-sectional shape as shown in Fig. 4, giving a hollowness ratio of 15%.
From 40 spinnerets, the spinning temperature was 280°C and the spinning speed was 10.
Spun at a speed of 00 m/mm and condensed to form a tow so that the drawn yarn denier is approximately 300,000 denier.
Stretching was performed using a hot water stretching bath at 75° C. at a stretching speed of 100 m/mm and a stretching ratio of 3.2, and a mixed solution of dimethylpolysiloxane and methylhydrodiene polysiloxane was added at a dry weight of 0.0% to the fiber. After applying 3%, crimps were applied using a push crimper, and heat setting was performed at 140° C. for 30 minutes.

The tow thus obtained was opened using a tow opening apparatus as shown in FIG. The diameter of the first opening roller 7 shown in FIG. The peripheral speed of the gripping and transferring rollers 6, 8, and 10 was set to 4 times.

The outer diameter of the second opening roller 9 is the upper and lower rollers (9'9'')
Each roller is 15 cm long and has the shape shown in Figures 24 and 27, and the length of the edge portion is 1 cm, with 15 edges on one roller. The interlocking depth was 5 mm. The circumferential speed of the second spreading roller 7 was four times the circumferential speed of the tow gripping and transferring rollers 6, 8, and 10. The width of these roller groups used for tow spreading was was set to 50 cm.

The tows opened in this way are refocused and 38
The fibers were cut into mm pieces and immediately separated and opened using compressed air. The physical properties of the obtained fibers are as shown in the column of Example 1 in Table 1. As shown in Table 1, the opening rate was extremely high. This was compressed to a specific volume of 2.5 cm3/g and packed into bales.

When I unpacked this after leaving it for about 20 days, the unloaded bulk was 4.
It was extremely high at 5 cm3/g, and when this was passed through a normal feather blow molding machine, the blowing operation could be carried out without any problems.

Comparative Examples 1, 2, 3, 4 Comparative Example 1 in Table 1 shows the results of fiber testing without tow opening on the implementation side 1. When the tow was not opened, the opening rate was low, the unloaded bulk after unpacking was low, and the blow moldability was poor, and the blow molding machine frequently clogged, making it impossible to blow.

Comparative Example 2 in Table 1 shows the results of testing in Example 1 without carrying out crimp heat fixing. In this case, the silicone resin does not react and has a high coefficient of friction, and even if the crimp is increased during the indentation crimp process, the crimp becomes stiff during the tow opening process, and the unloaded bulk after unpacking is low, resulting in poor blow moldability. Ta. The texture was rough and not good.

Comparative Example 3 in Table 1 shows the results of setting the number of crimps and the crimping rate to be slightly low when applying indentation crimps in Example 1. Since the number of crimps and the crimping rate were low, the unloaded bulk of the package was low, and although it was possible to blow into the package, it could not be said to be fully satisfactory.

Comparative Example 4 in Table 1 shows the results of Example 1 in which the fibers were not separated and opened using compressed air immediately after cutting. Although the opening rate was sufficient and there were few unopened areas, the fibers were not dispersed in a random manner, so the unloaded bulk after unpacking was insufficient and the blow moldability was poor.

Examples 2 and 3 Example 2 in Table 1 shows the results when the cross section of Example 1 was made circular and the single yarn fineness and crimp characteristics were slightly changed.

The fiber opening amount was high, the unloaded bulk after opening was high, the blow moldability was good, and the texture was soft and good.

In Example 1, the cross section was made circular, the single yarn fineness and winding characteristics were slightly changed, and the fiber length was changed to a large width. The results are shown in Example 3 in Table 1. Blow moldability was good despite the long fiber length.

Example 4 In Example 1, I. V. For 50% by weight of polyethylene terephthalate of 0.65 IV. The procedure was carried out in the same manner as in Example 1, except that 0.65% polybutylene terephthalate was spun side-by-side using a hollow spinning nozzle giving a hollowness ratio of 10%, and the stretching ratio was set to 4.5. The physical properties of the obtained fiber are shown in Example 4 in Table 1.

Although the crimp was in the form of three-dimensional curls, both the fiber opening rate and the unloaded bulk after unpacking were high, and the blow moldability was good.

Comparative Examples 5 and 6 Comparative Example 5 in Table 1 shows the results of carrying out the same procedure as in Example 6 except that octyl phosphate potash was used instead of the silicone resin in Example 4. Due to the high coefficient of friction, the unpacked bulk after unpacking was low and the texture tended to be rough, similar to Comparative Example 2.

In Example 4, the single fiber degree was set to 6 denier, which is outside the range of the present invention, and the tow was cut to 38 cm without being opened, and immediately opened using compressed air. The results are shown in Comparative Example 6 in Table 1.

Blow molding was also possible, but the texture was rough and far from feather down.

[Brief explanation of the drawing]

Figure 1 is a diagram of the conventional cotton manufacturing process in which crimped tow is heat-set and then cut, Figure 2 is a diagram of the cotton manufacturing process of the present invention, and Figures 3 to 22.
The figure shows an example of an irregular cross-section nozzle, and FIGS. 23 to 25 are examples of cross-sectional views of the second fiber opening roller. 26-28 are plan views of the edges of the second opening rollers of FIGS. 23-25, respectively. ′j? 3. So + Gaiji 1 heart, atmosphere 1! ;已 や)L口〉￥S Island 'li' 4 pieces λz 3 巳 凾凱な2PAA ☆qFig. Name of the invention: Method for advancing synthetic fibers for blow molding 3 Relationship with the case of the person making the amendment Special, ?'1゛Applicant: 1-11 Minamihonmachi, Higashi 1, Osaka-shi (300) Teijin Limited Representative Tomo Tokusue Dai Teijin Co., Ltd. 136 Contents of amendment (11 Specification, page 2, line 10, says ``bulky nature'')
"High bulk," he corrected. (21 In the same page 3, line 13, [-based oil agent-1] is corrected to ``based oil agent.'' Texture, 1 and correction -t6゜(4)
On page 4, line 13, it says "Blow molding machine" [Blow molding machine J and revised 1iE'1, (5) on page 6 f!
In line S3, "Blow molding" should be corrected to "Blow molding". (6) On page 6, line 11 of the same page, ``Fix crimp heat (-'') is corrected to ``heat fix crimp 1.'' (7) Page 7, lines 12 to 13 of the same page. (8) In the same page, page 7, line 17, K "Blow moldability" is corrected to read "Blow moldability." (9 ) In the same page 10, line 9, [G, boxy group-containing polysilicon pkizan-a] is corrected to "epoxy group-containing polysilicon pkiza/, a". '' is corrected to ``commonly,''
and NJ, i)E
I corrected myself. (L4 Same page m23 m8 line K['fLffxchini'R
t-11, V, J is "gravity)" and i, V, J
I am corrected. 04 On the 9th line of page 23 of the same page, it says "50 weights in a row" [Corrected to read "50 weights in a row". +1!9 “Example 6
'' has been corrected to ``1 Example 4''. IJ [) l? 'J No. 26B, line 4 says "of a nozzle with an irregular cross section". Correct it to "of an irregular cross section." 0η On page 26, line 8 of the same page, the word "plan view" is corrected to "cross-sectional view." Insert the following sentence next to line 8 of Ql 9” page 526. “1 is crimped tow, 2 is heat treatment machine, 3 is cutter, 4 is stable fiber after cutting, S Gi guide roller, 6 , 8.10 is a tow gripping transfer roller, 7 is the first I
Jiqrei roller, 7' is a cut roller, 7'' is a normal roller. 9 is a second opening roller, 9' is a second opening roller,
9" is the second opening, lower roller, 11 is the guide "7-
Ra, 12 are air nozzles. ”09 Figure 1 and γy 2nd
The figure is attached to the attached sheet. that's all

Claims (5)

[Claims] (1) Single yarn fineness 3 denier or less, coefficient of static friction between fibers 0.
After passing through the process of repeatedly loosening and tensioning the heat-set crimped tow of 30 or less in the length direction of the tow to cause tension fluctuations, and the process of opening the tow with a gear-like opening body, A method for producing synthetic fibers for blow molding, characterized in that the fibers are cut into fibers having a length of 200 mm or less, and then immediately sprayed with compressed air to separate and open the fibers. (2) The manufacturing method according to claim (1), wherein the fiber is a yarn with an irregular cross section having at least one protrusion. (3) The fiber has at least one protrusion and the hollowness ratio is 3 to 3.
The manufacturing method according to claim (2), wherein the fibers are 45% irregularly shaped hollow fibers. (4) Claims (1) to (3) are crimped tows in which a surface treatment agent containing silicone resin as a main component is applied in an amount of 0.1 to 3.0% by weight based on the weight of the dry fibers. The manufacturing method described in any of paragraphs. (5) The manufacturing method according to any one of claims (1) to (4), wherein the fiber is a polyethylene terephthalate fiber.