JPS61174412A - Nozzle pack for mixed spinning - Google Patents

Abstract

PURPOSE:To enable the spinning of a yarn free from mixing unevenness between the yarn group or between the single filaments even in the case of a mixed spinning of two kinds of polymers having extremely different mixing ratios, by attaching a particular polymer channel in the nozzle pack. CONSTITUTION:The nozzle pack for the mixed spinning is composed of the region 6 to filter and disperse the separately supplied two kinds of polymers A and B and to form the composite plane flow of the polymers, the static mixer 12 to mix the composite flow, and the nozzle plate 14 to extrude the mixed polymer. In the above device, the channel (a) of the polymer A consisting of the introducing path 1A and distribution path 4A is placed in the zone 6 for forming the composite plane flow, and the channel (b) of the polymer B consisting of the introducing path 1B, the distribution path 8, the connection groove 9 and the inlet path 10 is attached to the downstream side of the introducing part of the zone 6 directing from the bottom upward based on the composite plane flow-forming zone 6.

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention provides two types of polymers A and B having extremely different mixing ratios.
When mixing and spinning to obtain yarn.

The present invention relates to a spinneret pack for mixed spinning that enables efficient mixing and, as a result, suppresses uneven mixing between groups of yarns or between single yarns.

[Conventional technology and its problems]

Conventionally, when spinning polymers 7A and B with different properties, they are mixed and stirred to obtain yarn with excellent various functions, using chips or powder.

A method in which polymers A and B in a liquid state are mixed in advance in a mixer, etc., and then further mixed and stirred in a melting device and a supply device to obtain yarn through a 9-cap pack, or a method in which polymers A and B are mixed. Instead, they are melted and supplied separately in the same nozzle pack.

Furthermore, a method is generally known in which filtration is performed separately within the pack, polymers A and B are brought together just before the nozzle plate, and then mixed using a mixing and stirring device such as a static mixer to obtain yarn.

In the former case, since Polymers A and B are mixed in advance, fewer devices are required for melting and supplying the polymers than in the latter case; Since it takes time to process, there is a drawback that side reactions and decomposition reactions occur between the polymers used.

Furthermore, mixing in the melting and feeding apparatus often progresses too much, making it impossible to obtain the desired mixed form.

In addition, if the mixing ratio of either Polymer A or B is extremely low, or if the shapes and properties are different, uneven mixing may occur in the length direction of the yarn or between yarns with different spinner packs due to the passage of time during spinning. Occur.

In the latter method, polymer A,
Since B is separately melted, supplied, and further distributed through filtration, both polymers are brought together just before the nozzle plate, and mixed and stirred with a static mixer, the frequency of occurrence of side reactions between polymers such as the former 9 decomposition reactions is reduced. There are few.

It is also possible to control the mixing by changing the number of elements in the static mixer, and the latter method is often adopted, especially when the aim is to avoid excessive mixing and obtain a lightly mixed yarn. There is.

However, even if the latter static mixer is used, undesirable phenomena may occur depending on the conditions. In other words, if the mixing ratio of Polymer B to Polymer A is significantly different, such as 1/5 or 1/10 or less, the yarn passing through the static mixer may have different mixing ratios between single fibers or multiple fibers. When a single nozzle plate consisting of hole groups is used, a clear difference occurs in the mixing ratio between the yarn groups. In such a case, the single yarn is often wound around the roll and broken during the drawing process.

As a method to eliminate the uneven mixing between single yarns or groups of yarns, it is easy to think of a method of increasing the number of threads in a static mixer without limit, and in fact, the uneven mixing is on the way to being eliminated.

Nowadays, synthetic fibers with improved functionality such as antistatic performance or water absorption performance are in great demand, but polymers with these functions are currently extremely unstable against light, temperature, and friction. It is. Therefore, these polymers cannot be used as a single thread, but a stable polymer that inevitably becomes a pace is mixed with a necessary minimum amount of polymers having these functions to impart nine functions.

Here, if we take antistatic yarn made by mixing polymers as an example, if the polymer mixing progresses excessively and the polymer that has an antistatic effect becomes finely dispersed in three dimensions, the static electricity generated will become charged and dissipate into the atmosphere. In order to increase the antistatic effect, it is necessary for the polymer with antistatic performance to exist in streaks in the pace polymer and to be continuous in the yarn length direction. It is. That is, it is necessary to have a state in which the ingredients are mixed lightly and there is no uneven mixing.

On the other hand, many spinneret packs for mixed spinning using a static mixer have been proposed.
The publication discloses an apparatus in which a portion of a static mixer is vertically placed in a mouth pack, and a plurality of polymers are brought together and rapidly mixed just before the inlet of the static mixer to obtain yarn.

The present inventors also proposed a mixing device similar to that shown in FIG. At the same time, spinning was performed using a spinneret pack structured to be supplied to a static mixer, and the mixing degree of polymers A and B between single yarns and between yarns was evaluated for the obtained yarn, and the mixing ratio was 5. When the mixing ratio is relatively similar to 5:3 or 5:3, the desired mixing state is obtained and the performance is good, but when the mixing ratio is 5=1 or 10
: If the ratio is extremely different from 1, polymers with a low mixing ratio may be abnormally concentrated in some single yarns or thread groups, or single yarns with no evidence of being mixed at all will be found, making it difficult to use as a product. Further, in the case of a single yarn in which polymers having a low mixing ratio were mixed in a concentrated manner, the single yarn got caught in the drawing roller in drawing step 8, and a satisfactory drawn yarn could not be obtained.

In other words, the mixing method as introduced in the publication is as follows:
Polymers A and B that meet at the inlet of the static mixer are surrounded by polymers with a low mixing ratio and form a so-called core-sheath structure and flow into the element cavity in the mixer. If the polymer with a low mixing ratio located in the area becomes eccentric due to the machining precision of the parts, the flow of the polymer with a high mixing ratio, or fluctuations in pressure, and flows into the element cavity, even though it is mixed and agitated by the element. If you sample the mixed polymer at the exit of the mixer and observe its cross section, you will find that the mixed polymer is unevenly mixed.

In addition, when a polymer with a low mixing ratio associates with a polymer with a high mixing ratio, multiple orifices are provided so that the polymer with a low mixing ratio flows into the voids of the mixer element in an average manner by dispersing it in a striped manner. However, even with this method, due to the pressure of the polymer with a high mixing ratio, which is supplied in an overwhelmingly large amount, the polymer with a low mixing ratio that was dispersed in a streak-like manner reaggregates and becomes a single strand. It becomes a collective.

[Purpose of the invention]

The object of the present invention is to improve these drawbacks of the prior art and to develop a polymer A that has different properties.

To provide a spinneret pack that uses the minimum necessary number of mixer elements to mix and stir B with a static mixer, with light mixing, and to obtain yarn with less uneven mixing between yarn groups and single yarns. It's about trying.

[Structure of the invention]

The present invention has the following configuration.

A composite planar flow forming area 6 that separately supplies two types of polymers A and B to the same nozzle pack, filters and disperses them, and forms a composite flow; a static mixer 12 that mixes the composite flow; In a mixed spinning spinneret pack comprising a nozzle plate 14 for discharging.

In the composite planar flow forming area provided above the static mixer, one polymer A flow path (A), which also serves as a guide path A and a distribution path 4A, is provided, and further a guide path 1B and a distribution path 4B.

Introductory path 8. Connection groove 9. The other polymer B flow path (b) consisting of the inflow path 10 is arranged downstream of the introduction part of the composite planar flow forming area of polymer A and upward from below with respect to the composite planar flow forming area. Spinneret pack for mixed spinning.

It is.

[Action and effect of the invention]

Below, the operation of the present invention will be explained in more detail.

Polymers A and B in the present invention are not particularly limited as long as they have a fiber-forming function. Especially the pace. That is, as the polymer having a high mixing ratio, a polymer such as polyester, polyamide, or polypropylene is preferably used.

Examples of static mixers include K-EX's "Static Mixer", Sluzer's "Static Mixer", "Melt Blender", and Sakura Seisakusho's "Scare Mixer", but are not limited thereto.

In addition, the number of static mixer elements should be limited to 3 to 5 elements in order to achieve light mixing according to the present invention and to obtain yarns with less uneven mixing between single yarns and yarn groups. When the number of static mixer elements is less than 3 elements, the number of mixing repetitions is low due to the small number of mixer elements. It becomes a clause. Also.

When the number of mixer elements exceeds 5 elements.

This time, the mixing progresses excessively, and the mixture no longer exhibits the streaky, mild mixing described in the present invention, and the desired performance also deteriorates due to excessive mixing. In other words, if it is desired to obtain a yarn in which polymers with a low mixing ratio as used in the present invention are lightly mixed and are streak-like and infinitely continuous in the length direction of the yarn, a static mixer element is used. The number of elements should be limited to 3 to 5 elements.

In addition, if the clearance of the composite plane flow forming area where polymers A and B meet is less than 1 m, the pressure loss that occurs when the polymers flow increases and the pressure in the mouth puncture increases, causing damage to the polymer supply pump or This causes the members that make up the inside of the pack to curve. Also, if you exceed 3 hani.

Although the above-described pressure increase inside the puncture can be prevented, the residence time of the polymer becomes longer and decomposition of the polymer is promoted.

Particularly when a thermally unstable polymer is used, decomposition due to retention is rapidly accelerated. It is preferable that the clearance of the composite plane flow forming region is appropriately selected depending on the amount of polymer supplied.

When the polymer supply amount is 70 g per minute or less for the total amount of polymers A and B, a clearance of 1 yen is preferable;
It is preferable to use a clearance of 2fi near 15oy.

In order to lightly mix polymers A and B, which have extremely different mixing ratios, with the minimum necessary number of elements, and to obtain yarns with little unevenness between single yarns and yarn groups, the mixing ratio at the inlet of the static mixer must be adjusted. If the polymer supply part with a low mixing ratio is located in the center of the polymer with a high mixing ratio, unevenness will occur when it flows into the mixer element cavity, and even if it is mixed and stirred by the mixer element, the mixing will be uneven. It is unavoidable.

In other words, in order to uniformly flow into the mixer element cavity,
In a static mixer, the polymer with a low mixing ratio must be located on the outer periphery of the polymer with a high mixing ratio, surrounding it in multiple stripes, and furthermore, when flowing into the voids of the mixer elements, , it is necessary to flow along the inner peripheral wall surface of the static mixer.

The present invention will be explained below with reference to FIG.

Furthermore, in Japanese Patent Application Laid-Open No. 56-154208, two or more components are divided into a plurality of components, each component is introduced into the center of the cap device alternately in the circumferential direction, and a static mixing element is used to mix the components microscopically. A spinneret device with a homogeneous mixing structure is shown.

On the other hand, the puncture of the spindle of the present invention has a structure in which the other polymer is introduced downstream from the introduction part of one polymer and from below into the composite plane flow forming area. This makes it possible to obtain a polymer with a moderately mixed form without uneven mixing.

Two types of polymers A and B with different properties are separately melted and supplied to the guideway IA and the guideway IBK polymer B, respectively, and the A and B polymers are filtered at the corresponding shoulders 2A and 2B, respectively. The polymer A is directly supplied to the composite plane flow forming area 6 through the distribution passage 4A bored in the distribution plate 3. Note that (a) is the flow path for polymer A and guide path 9.
Consists of distribution channels.

On the other hand, polymer B has another distribution path 4B bored in the distribution plate 3.
The polymer A is supplied to the introduction passage 8 of the guide plate 7 provided on the outer circumferential side of the flow passage flowing into the composite planar flow forming region 6, and the inflow passage 10 provided in the same manner as the introduction passage 8 is further provided by the connecting groove 9. By.

It flows upward into the composite planar flow forming region 6 and associates with the polymer A. (B) is a flow path for polymer B; it consists of a guide path, a distribution path, a connecting groove, and an inflow path.

In contrast to the flow of polymer A, polymer B flows upward from the bottom, forming a plurality of streak-like composite flows toward the inlet 11 of the static mixer. Since polymer B flows while being positioned at the bottom of polymer A in the composite planar flow forming region 6, at the entrance of the static mixer, polymer A is surrounded by a plurality of stripes and flows through the voids of the mixer element 12, that is, the static system. The water flows along the inner peripheral wall surface of the outer cylinder 13 constituting the mixer and is mixed by the mixer element 12. The mixed polymer is spun out from the nozzles of the nozzle plate 14. Note that 5 represents Ringebackin.

That is, the polymer with a low mixing ratio surrounds the polymer with a high mixing ratio at the inlet of the static mixer, and the polymer with a low mixing ratio forms a core-sheath structure located in the center as in Japanese Patent Publication No. 52-43926. Since there is no excess flow, uneven inflow due to eccentricity etc. can be prevented.

Note that the number of introduction channels and inflow channels provided in the guide plate is not particularly limited, but at least five inflow channels should be opened. When the number of open pores is less than 5, the polymer with a high mixing ratio is surrounded by streaks at the inlet of the static mixer, but because the number of streaks is small, deviation occurs when it flows into the mixer element cavity. There are things to do. However, it is not necessary to increase the number of holes in the inflow channel without limit, and if the number of holes is increased without limit, the residence time may increase, or the polymer with a high mixing ratio may be discharged in streaks due to the flow of the polymer with a low mixing ratio. The flow of the polymer is interrupted, which has a negative effect.

In other words, the number of holes of the inflow passages opened in the guide plate is 5.
The number of holes is preferably at least 50 and less than 50. Further, as a means for connecting the introduction path and the inflow path, a gap may be provided on the entire surface between the introduction path and the inflow path, but in order to shorten the residence time of the polymer, it is preferable, and more preferably, to connect the introduction path and the inflow path by a groove. is in the inlet path 1 hole path.

On the other hand, in order to suppress discharge unevenness in the inflow path.

It is preferable that one or two grooves connect one or two inflow passages. Therefore, it is preferable that the number of holes in the introduction path be equal to or half the number of holes in the inflow path.

In addition, the diameter of each hole cannot be definitively determined depending on the supply amount of polymer with a low mixing ratio, but it should be 1 to 2 cm in order to suppress residence time. In order to suppress discharge unevenness, it is preferable to reduce the diameter to 0.5 or less.

The yarn obtained in this way can be mixed lightly using the minimum number of mixer elements necessary, and is suitable for providing yarn with very little uneven mixing between single yarns and between yarn groups. I can say that. This is particularly effective when the mixing ratio of polymers A and B is extremely different, that is, when the discharge ratio of polymer B is smaller than that of polymer A.

Next, FIG. 2 is a diagram showing an example of a conventionally used die pack for mixed spinning.

Polymers A and B, which have different properties and are melted and supplied separately to the puncture cap, pass through guide paths 1 (A) and 1 (B) to E layers 2 (G) and 2 (G) corresponding to polymers A and B, respectively. After filtration in step B), the two polymers A and B flow into the composite basin 15 through the distribution passages 4 (A) and 4 (B) drilled in the distribution plate 3, and the polymer A and the polymer B flow into the composite basin 15. It flows into the cavity of the mixer element 12 with a so-called core-sheath structure.

〔Example of use〕

Hereinafter, the effects of the present invention will be explained in more detail by showing usage examples using the cap pack of the present invention.

Note that the characteristic values in the nine examples were measured by the following method.

(1) Intrinsic viscosity of polyester [η]
It was determined from the solution viscosity measured at 0°C.

(2) Antistatic performance sample was washed for 2 hours using an electric washing machine in a weak alkaline aqueous solution of 0.2% anionic activator, then washed with water and dried, and then the length was 5 m and the fineness (D) was 1000. After adjusting the humidity at 20℃ and 40% RH for 2 days by aligning them into denier fiber bundles, the resistance of the sample was measured using an electrometer at an applied voltage of 500V, and the volume resistivity (Ω-
m) was used as a measure of antistatic performance.

here.

! Two volume resistivity (Ω-crn) R: resistance (Ω-tM) D: Fineness (denier) t: fiber sample length (σ) d: Sample density (1171td) It is.

(Usage example 1) Using the mixed spinning die pack shown in Fig. 1, the intrinsic viscosity [
A polyethylene terephthalate whose η] is 0.65
It was supplied as a component from the polymer guideway IA at a rate of 79.71 per minute. In addition, polymer guideway IB has a molecular weight of 3,000.
30 weight polyethylene glycol! In order to further evaluate the mixing degree between single yarns and between yarns, 5-
A polyester mainly composed of polyethylene terephthalate having an intrinsic viscosity [η of 10.96] obtained by copolymerizing 5 moles of sodium sulfoisophthalate was fed at a rate of 8.8 g per minute.

Both polymers undergo r-filtration through two layers 2A and 2B and pass through 9 distribution channels 4A.
, After supplying only the B polymer to 4B, an inlet passage with an inner diameter of 2fi, in which 20 holes were opened in each 8. Outlet inner diameter 0.3m
Polymers A and B were mixed in a static mixer having five mixer elements 12. Thereafter, the yarn spun from the nozzle plate 14, which has 72 orifice holes with a diameter of 0.25 m, is divided into 36 filaments each from the center of the nozzle to form two groups of yarn, and while a prescribed amount of spinning oil is applied. Spinning speed 3500
It was wound onto a bobbin at m/min.

The highly oriented undrawn yarn thus obtained was drawn by a known drawing method to obtain a drawn yarn having a fineness of 72.3 deniers and a filament count of 36 filaments.

In addition, the occurrence rate of yarn wrapped around the roller during stretching was 0.
．． The results were as good as 18%, which is almost the same as normal stretching. The drawn yarn is made into a tubular knitted fabric for each bobbin.

As a result of visually evaluating the dyeability using the cationic dye Astrazon Blue FRRJ manufactured by Bayer, 99.2% of the evaluated pieces fell within the evaluation criteria.Furthermore, Polymer B between single yarns In order to evaluate the mixing degree of 36 filaments, we dyed the yarn cross section of 36 filaments with the cationic dye and observed the mixed state of polymer B under magnification. Polymer B was found to be present in many layers in polymer A, which occupied the majority of the fibers. It is dyed as overlapping ring-shaped streaks, and when observing the morphology among the single threads, all the single threads exhibit almost the same morphology.

Polymer B is abnormally concentrated in some single yarns.

Or few single threads are not generated. In addition, as a result of dyeing the cross section of some single yarns every 100,000 m in the fiber length direction for 2 million m, and observing the mixed form of B polymer, the ring-shaped streaks of B polymer were almost the same. It was confirmed that the ring-shaped morphology of polymer B continues almost indefinitely without losing its shape.

In addition, as a result of measuring the antistatic performance of the drawn yarn according to the measurement method described above, the volume resistivity of the yarn was 4.6xlO(
Ω-l:rn), which was good.

(Comparative use example 1) As shown in Fig. 2, the same polymer as in use example 1 is used, except that the guide plate 7 in the metal nozzle is removed compared to Fig. 1. Composition, supply amount,
Spinning was performed using the number of mixer elements and spinning conditions to obtain highly oriented undrawn yarn. The results of stretching the undrawn yarn under the same conditions as in Use Example 1.

Cutting due to poor unwinding from the bobbin during stretching.

Alternatively, breakage occurs during stretching due to the single yarn being wrapped around the stretching roller, and the amount of drawn yarn collected without winding around the stretching roller is 3.3 and 4 as one pirn, and as a result, 1
It was only 3.9%. Pern that was barely cut during stretching was dyed with a cationic dye in the same manner as in Use Example 1, and visually evaluated. As a result, 87.3% of the pieces were outside the evaluation criteria.

It was not something that could be used as a product. In addition, when the yarn cross section was dyed and the mixed state of Polymer B, which has antistatic properties, was observed under magnification, it was found that although there were single yarns exhibiting ring-shaped streaks similar to those in Use Example 1, In between, the shape was irregular. Furthermore, it was confirmed that an abnormally large amount of Polymer B was mixed between the single yarns, or that there was no evidence that Polymer B was mixed at all.

Moreover, when drawing is performed using the undrawn yarn.

When the monofilament wound with a drawing roller was collected and the cross section of the monofilament was dyed and observed under a microscope, it was confirmed that more than half of the cross-sectional area of the monofilament was occupied by Polymer B.

(Comparative Example 2) Using the same die pack and polymer as in Comparative Example 1, increasing the number of mixer elements to 8.12 elements to eliminate uneven mixing, and using the same polymer, spinning, and drawing conditions as in Example 1. A drawn yarn was obtained.

By increasing the number of mixer elements by 3 to 7 elements, defects in unwinding from the bobbin during stretching and see-through on the stretching roller are drastically reduced compared to Comparative Use Example 1, and the yarn that is stretched and wound onto the pirn is greatly reduced. The results of dyeing the strips as tube fabrics and visually evaluating the dyeability.

The percentage of paan that fell within the evaluation criteria was 96.2%, which was considerably inferior to Use Example 1, but was effective in suppressing mixing unevenness. However, when evaluating the antistatic performance in the same manner as in Use Example 1, the volume resistivity value of the yarn is 9.3×10 (Ω) when the number of mixer elements is 8 elements.
-Crn), 1 for 12 elements, . 3 x 10
(Ω-ctn), and the antistatic performance was not much different from that of polyethylene terephthalate itself.

In addition, when the cross-section of the yarn is dyed and the mixed form of Polymer B, which has antistatic properties, is observed under magnification.

Polymer B was finely dispersed three-dimensionally in both mixer elements with 8 elements and 12 elements, and the ring-shaped streaks seen in Use Example 1 were not observed.

[Brief explanation of drawings]

FIG. 1 shows a sectional view of a mixed spinning die pack of the present invention, and FIG. 2 shows a sectional view of a commonly used mixed spinning die bag. In Figure 1, 1A and IB are two types of polymer guiding paths, 2A and 2B are p-layers, 3 is a distribution plate, 4A and 4B are distribution channels, 5 is a ring packing, 6 is a composite plane flow forming area, and 7 is a Guide plate, 8 is an introduction path, and 9 is a connecting groove. 10 is an inflow path, 11 is a static mixer port, 13 is a mixer element outer cylinder, 14 is a nozzle plate, and (a) is a flow path for polymer A, which is composed of a guide path and 9 distribution paths. (B) is a flow path for polymer B, including a guide path, 9 distribution paths, and a connecting groove. It consists of an inflow channel. In addition, in Fig. 2, 1 (A>, 103) is a guiding path of two types of polymers, 2 (5), 2 (B) are P layers, 4 layers, 4 (B)
) indicates a distribution channel, 15 indicates a composite region of both polymers, and other same symbols indicate the same parts as in FIG.

Claims (5)

[Claims] (1) A composite planar flow forming area 6 that separately supplies two types of polymers A and B to the same nozzle pack, filters and disperses them, and forms a composite flow; and a static mixer 12 that mixes the composite flow;
In a mixed spinning nozzle pack consisting of a nozzle plate 14 for discharging a mixed polymer, one flow path (a) for polymer A consisting of a guide path 1A and a distribution path 4A is provided in a composite planar flow forming area provided above a static mixer. In addition, a guide path 1B, a distribution path 4B, an introduction path 8, a connecting groove 9, an inflow path 10
A mixing spinneret comprising a flow path (b) for the other polymer B, which is arranged downstream of the introduction part of the composite plane flow forming area of polymer A, and upward from below with respect to the composite plane flow forming area. pack. (2) The mixed spinning nozzle pack according to claim 1, wherein the clearance of the composite plane flow forming area is 1 to 3 mm. (3) The mixed spinning die pack according to claim 1 or 2, wherein the diameter of the hole in the inflow path for polymer B into the composite planar flow forming area is 0.1 to 0.5 mm. (4) The mixed spinning spinneret pack according to claim 1, 2, or 3, wherein the number of inflow holes for polymer B into the composite planar flow forming area is 5 to 50 holes. (5) The mixed spinning spinneret pack according to claim 1, 2, 3, or 4, wherein the static mixer has 3 to 5 elements.