CN108004634B - Polylactic acid colored long slub yarn, drawing device for processing same and processing method - Google Patents
Polylactic acid colored long slub yarn, drawing device for processing same and processing method Download PDFInfo
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- CN108004634B CN108004634B CN201810033537.6A CN201810033537A CN108004634B CN 108004634 B CN108004634 B CN 108004634B CN 201810033537 A CN201810033537 A CN 201810033537A CN 108004634 B CN108004634 B CN 108004634B
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- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
- D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
- D02G3/34—Yarns or threads having slubs, knops, spirals, loops, tufts, or other irregular or decorative effects, i.e. effect yarns
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01H—SPINNING OR TWISTING
- D01H5/00—Drafting machines or arrangements ; Threading of roving into drafting machine
- D01H5/18—Drafting machines or arrangements without fallers or like pinned bars
- D01H5/32—Regulating or varying draft
- D01H5/36—Regulating or varying draft according to a pre-arranged pattern, e.g. to produce slubs
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01H—SPINNING OR TWISTING
- D01H5/00—Drafting machines or arrangements ; Threading of roving into drafting machine
- D01H5/18—Drafting machines or arrangements without fallers or like pinned bars
- D01H5/70—Constructional features of drafting elements
- D01H5/74—Rollers or roller bearings
- D01H5/78—Rollers or roller bearings with flutes or other integral surface characteristics
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- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
- D02G3/02—Yarns or threads characterised by the material or by the materials from which they are made
- D02G3/04—Blended or other yarns or threads containing components made from different materials
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- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
- D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
- D02G3/34—Yarns or threads having slubs, knops, spirals, loops, tufts, or other irregular or decorative effects, i.e. effect yarns
- D02G3/346—Yarns or threads having slubs, knops, spirals, loops, tufts, or other irregular or decorative effects, i.e. effect yarns with coloured effects, i.e. by differential dyeing process
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
- D10B2331/04—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyesters, e.g. polyethylene terephthalate [PET]
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Abstract
The invention provides a polylactic acid colored long slub yarn, which can solve the problems that the conventional polylactic acid colored long slub yarn needs to be dyed later on polylactic acid fibers or yarns, so that the yarns are easy to harden and the color fastness is low when the yarns are dyed in deep colors, and can also solve the problem that the conventional polylactic acid colored long slub yarn is high in production cost. The composite fiber is prepared by combining at least two fibers with different colors into bamboo joint strips at last and spinning through a spinning process, wherein the fibers are all polylactic acid fibers or polylactic acid fibers and other textile fibers, and the polylactic acid fibers are polylactic acid colored short fibers prepared by stock solution coloring. Therefore, the invention also provides a drawing device for processing the polylactic acid colorful long slub yarn and a long slub yarn processing method.
Description
Technical Field
The invention relates to the field of textile materials and processing thereof, in particular to a polylactic acid colorful long slub yarn, a drawing device for processing the same and a processing method thereof.
Background
The polylactic acid is polymerized by lactic acid obtained by fermenting crop products (such as corn, potato, sugarcane, cassava and the like) rich in starch, the fabric woven by spinning the polylactic acid has the characteristics of skin friendliness, air permeability, natural bacteriostasis, good biocompatibility and the like, has low combustion heat value and no harmful substances, can be completely degraded into carbon dioxide and water under the composting effect for 6-12 months, and is a new environment-friendly new textile material of a new era.
However, the existing polylactic acid color long slub yarns on the market are still less, on one hand, because the polylactic acid fiber needs to be dyed by using disperse dyes firstly and then spun into the color long slub yarns by a slub yarn spinning process when the polylactic acid color long slub yarns are produced, or the polylactic acid fiber with primary color is firstly spun into the long slub yarns and then the long slub yarns are dyed. Due to the limitation of the molecular structure of polylactic acid, the glass transition temperature of the polylactic acid is low, and the polylactic acid must be carried out under the conditions of high temperature and high pressure when the polylactic acid is used for dyeing fibers or yarns, particularly for dyeing deep colors, so that the strength of the polylactic acid fibers is greatly damaged, the hardening phenomenon is easy to occur, and the color fastness for dyeing deep colors cannot break through three levels.
On the other hand, the existing method for spinning long slub yarns can only be used for manufacturing long slub yarns by additionally arranging equipment for producing the slub yarns on a spinning frame, reforming a roller transmission part of the spinning frame and changing the rotating speed of a rear roller of the spinning frame on the spinning frame by using a slub yarn device, so that the method not only increases the equipment cost, but also has high equipment reforming cost.
Disclosure of Invention
In view of the above problems, the present invention provides a polylactic acid color long slub yarn, which can solve the problems that the existing polylactic acid color long slub yarn can be produced by post dyeing of polylactic acid fiber or yarn, so that the yarn is easy to harden and the color fastness is low when the yarn is dyed with deep color, and can also solve the problem that the existing polylactic acid color long slub yarn is high in production cost, and therefore, the present invention also provides a drawing device for processing the polylactic acid color long slub yarn and a long slub yarn processing method.
The technical scheme is as follows:
a polylactic acid colorful long slub yarn is characterized in that: the composite fiber is prepared by spinning at least two kinds of fibers with different colors, wherein the fibers are all polylactic acid fibers or polylactic acid fibers and other textile fibers, and the polylactic acid fibers are polylactic acid colored staple fibers prepared by stock solution coloring.
It is further characterized in that:
the other textile fiber is more than one of cotton, viscose, modal, tencel, terylene, chinlon, acrylic fiber, polypropylene fiber and soybean.
The utility model provides a drawing device is used in processing of colored long slub yarn of polylactic acid, its includes by back to preceding feeding part and the draft part that sets up, the draft part includes by preceding first roller pair, second roller pair and the third roller pair that sets gradually after to, the third roller pair is including roller and third lower roller, its characterized in that on the third: the middle part of the outer surface of the third upper roller is provided with a long groove, the length direction of the long groove is parallel to the length direction of the third upper roller, and the long groove is used for accommodating all pre-drawing strips; the arc length of the third upper roller corresponding to the long groove is 1/10-2/5 of the perimeter of the third upper roller, and the depth of the long groove is larger than the diameter of the pre-drawing.
It is further characterized in that:
the long groove is a rectangular groove.
A main drafting area is arranged between the first roller pair and the second roller pair, and the drafting multiple of the main drafting area is 5.8-6.5; and a back drafting area is arranged between the second roller pair and the third roller pair, and the drafting multiple of the back drafting area is 1.35.
The sliver feeding part comprises two cotton feeding rollers which are arranged up and down and a plurality of sliver dividers which are arranged at the rear sides of the cotton feeding rollers side by side, the sliver dividers are arranged along the length direction of the cotton feeding rollers at uniform intervals, and the sliver dividers are used for separating pre-drawing strips with different colors.
A processing method of polylactic acid colorful long slub yarn comprises the following processing steps of raw material preparation → blowing → cotton combing → head and end → end and → roving → spun yarn → spooling, and is characterized in that: in the raw material preparation procedure, the prepared raw materials comprise fibers with at least two different colors, all the fibers are polylactic acid fibers or polylactic acid fibers and other textile fibers, and the polylactic acid fibers are polylactic acid colored staple fibers prepared by coloring stock solution; and respectively carrying out the blowing, the carding and the drawing processes on the fibers of different colors to prepare corresponding pre-drawing strips, simultaneously feeding the pre-drawing strips of different colors into the drawing device in parallel, carrying out concentrated parallel feeding on the pre-drawing strips of the same color, carrying out end-mixing to prepare slub strips, spinning the slub strips into slub roving by a roving frame, spinning long slub yarns by a spinning frame, and finally pouring the long slub yarns into finished cone yarns by an automatic winder.
It is further characterized in that:
the dry basis weight of the pre-drawing is 17.5 g/5 m-19 g/5m, and the bamboo joint strips are formed by combining 6 or 8 pre-drawing strips.
The bamboo joint strip comprises a thick section and a thin section, wherein the dry basis weight of the thick section is 21.21 g/5 m-25.33 g/5m, and the dry basis weight of the thin section is 15.71 g/5 m-18.77 g/5 m.
The total draft multiple of the roving frame is 5.8-7.
The total draft multiple of the spinning frame is 28-35.
The invention has the beneficial effects that:
1. according to the polylactic acid colored long slub yarn, colored fibers are directly used for spinning colored yarns, the yarns do not need to be dyed in the later stage, the used polylactic acid fibers are polylactic acid colored short fibers prepared by a stock solution coloring method, so that the polylactic acid fibers do not need to be dyed in the later stage, the prepared yarns can show more colorful color systems on the basis of keeping the original performance of polylactic acid raw materials, particularly on the deep color which cannot be realized by dyeing, and the color fastness of the deep color can be stabilized at about four levels; meanwhile, the polylactic acid color long slub yarn is spun by combining fibers with different colors into bamboo joint strips at the end and then spinning, and the slub strips are directly obtained at the end, so that the long slub yarn can be spun by using a conventional roving frame and a conventional spinning frame subsequently without additionally arranging equipment for producing the slub yarn and modifying a roller transmission part of the spinning frame, and the bamboo joint strips are subjected to total drafting of the roving frame and the spinning frame to ensure that the bamboo sections and the base yarn sections are very long, so that the long slub yarn is obtained, and compared with the existing polylactic acid color long slub yarn, the yarn has more stable performance, higher color fastness, lower processing cost and more diversified styles;
2. the drawing device provided by the invention is characterized in that a third upper roller of a traditional final drawing frame is reformed, and a long groove is formed in the middle of the outer surface of the third upper roller, so that when the third upper roller rotates to a position without the long groove during final drawing, the pre-drawing frame can be subjected to normal back zone drafting; the device only needs to modify the third upper rollers of the traditional final drawing frame, the number of the third upper rollers of the traditional final drawing frame is usually two, so the modification work amount is very small, and one final drawing frame can supply 4-6 spinning frames, compared with the existing modified spinning frame for spinning long slub yarns, the device can greatly save the equipment cost and the equipment modification cost, and improve the processing efficiency;
3. according to the processing method of the polylactic acid colorful long slub yarn, the used raw material fiber is the colored fiber, and the polylactic acid fiber is the polylactic acid colored short fiber prepared by stock solution coloring, so that the polylactic acid fiber does not need to be dyed in the later period, and the prepared yarn can show more colorful color system on the basis of keeping the original performance of the polylactic acid raw material, particularly reflects on the deep color which cannot be realized by dyeing, and the color fastness of the deep color can be stabilized at about four levels; the polylactic acid color long slub yarn can be prepared by preparing the slub sliver firstly and then spinning the slub sliver, and can prepare the slub yarn with long segments under the conditions of not using an external slub yarn production device and not reforming a spinning machine.
Drawings
FIG. 1 is a schematic view of the drawing apparatus according to the present invention;
FIG. 2 is a left side view of the third top roller of FIG. 1;
FIG. 3 is a bottom view of FIG. 2;
FIG. 4 is a cross-sectional view taken along line C-C of FIG. 2;
FIG. 5 is a top view of the sliver feeding section of the drawing frame of the present invention.
Detailed Description
The invention relates to a polylactic acid colorful long slub yarn, which is formed by combining at least two kinds of fibers with different colors into bamboo joint strips at last and spinning through a spinning process, wherein the fibers are all polylactic acid fibers or polylactic acid fibers and other textile fibers, and the polylactic acid fibers are polylactic acid colored short fibers prepared by stock solution coloring; the other textile fiber is more than one of cotton, viscose, modal, tencel, terylene, chinlon, acrylic fiber, polypropylene fiber and soybean.
Referring to fig. 1 to 5, the drawing device for processing the polylactic acid color long slub yarn of the present invention comprises a feeding part 1 and a drafting part 2 arranged from back to front, wherein the drafting part 2 comprises a first roller pair, a second roller pair and a third roller pair arranged from front to back in sequence, the first roller pair comprises a first upper roller 211 and a first lower roller 212, the second roller pair comprises a second upper roller 221 and a second lower roller 222, the third roller pair comprises a third upper roller 231 and a third lower roller 232, a long groove 3 is formed in the middle of the outer surface of the third upper roller 231, the long groove 3 is preferably a rectangular groove or a long arc groove, etc., the length direction of the long groove 3 is parallel to the length direction of the third upper roller 231, and the long groove 3 is used for accommodating all pre-drawn yarns 4; the arc length (i.e., the length of the arc which is thickened in fig. 4) of the third top roller 231 corresponding to the long groove 3 is 1/10-2/5 of the circumference of the third top roller 231, and the depth of the long groove 3 is larger than the diameter of the pre-drawing 4. A main drafting area A is arranged between the first roller pair and the second roller pair, and the drafting multiple of the main drafting area A is 5.8-6.5; a back drafting zone B is arranged between the second roller pair and the third roller pair, and the drafting multiple of the back drafting zone B is 1.35. The sliver feeding part 1 comprises two cotton feeding rollers 11 arranged up and down and a plurality of sliver dividers 12 which are positioned at the rear sides of the cotton feeding rollers 11 and arranged side by side, the sliver dividers 12 are uniformly arranged at intervals along the length direction of the cotton feeding rollers 11, the sliver dividers 12 are used for separating different colors of pre-drawing slivers 4, and 41, 42, 43 and 44 in the drawing represent the pre-drawing slivers with different colors respectively.
The ratio of the arc length of the third top roller 231 corresponding to the long groove 3 to the circumference of the third top roller 231 determines the ratio of the thick section to the thin section of the slub bar, for example, when the ratio of the arc length of the third top roller 231 corresponding to the long groove 3 to the circumference of the third top roller 231 is 1:10, the ratio of the thick section to the thin section of the slub bar is 1 (9 × 1.35) =1:12.15 because the draft multiple of the back draft zone B is 1.35. The invention relates to a processing method of polylactic acid colorful long slub yarn, which comprises the following process steps of raw material preparation → blowing → cotton carding → head and → tail and → roving → spun yarn → spooling, wherein in the raw material preparation process, the prepared raw materials comprise fibers of at least two different colors, all the fibers are polylactic acid fibers or polylactic acid fibers and other textile fibers, the polylactic acid fibers are polylactic acid colored staple fibers prepared by a conventional stock solution coloring process, and the other textile fibers are more than one of cotton, viscose, modal, tencel, terylene, chinlon, acrylic fibers, polypropylene fibers and soybeans; respectively carrying out conventional blowing, carding and drawing processes on fibers of various colors to prepare corresponding pre-drawn slivers 4, wherein the dry basis weight of the pre-drawn slivers 4 is 17.5 g/5 m-19 g/5m, then simultaneously feeding 6 or 8 pre-drawn slivers 4 of various colors into a cotton feeding roller 11 of a drawing machine device of the polylactic acid color long slub yarn in parallel, intensively feeding the pre-drawn slivers 4 of the same color in parallel, separating the pre-drawn slivers 4 of different colors by a sliver separator 12, carrying out end spinning to prepare slub strips, wherein the slub strips comprise thick sections and thin sections, the dry basis weight of the thick sections is 21.21 g/5 m-25.33 g/5m, the dry basis weight of the thin sections is 15.71 g/5 m-18.77 g/5m, then carrying out slub strip spinning by a roving frame, the total draft multiple of the slub strips is 5.8-7, carrying out long slub yarn spinning by the spinning frame, and the total draft multiple of the slub yarn is 28-35, and finally, pouring the long slub yarn into finished cone yarn by an automatic winder.
The processing method of the polylactic acid colored long slub yarn is described in detail by the following specific examples:
the first embodiment is as follows:
step 1, preparing raw materials, namely preparing colored short fibers of polylactic acid with 4 colors, namely white, red, yellow and black, by using a conventional stock solution coloring process method;
step 5, feeding 2 red, 2 white, 2 black and 2 yellow pre-drawing slivers into a cotton feeding roller 11 simultaneously in parallel according to the drawing of fig. 4, separating the slivers with different colors by a sliver separator 12, feeding the slivers into a final drawing region B in parallel, feeding the slivers into a main drawing region A in parallel, and finally forming four-color bamboo joint slivers; the long groove 3 on the third upper roller 231 is a rectangular groove, the arc length corresponding to the long groove 3 on the third upper roller 231 is 7.85 mm, the length is 150 mm, and the depth is 3mm, the ratio of the arc length corresponding to the long groove 3 on the third upper roller 231 to the perimeter of the third upper roller is 1:10, the drafting multiple of the main drafting area of the drawing frame is 6.086 times, the drafting multiple of the rear drafting area is 1.35 times, the finally formed bamboo joint strip has the thick section dry basis weight of 24.98 g/5m, the section length of 47.78 mm, the thin section dry basis weight of 18.5 g/5m, the section length of 580.47 mm, and the ratio of the section length of the thick section to the section length of the thin section of the bamboo joint strip is 1: 12.15;
step 6, roving, namely spinning regular slub roving from slub bars by a roving machine according to a conventional spinning process, wherein the total draft multiple of the roving machine is 6.59, the dry basis weight of a thick section of the obtained slub roving is 7.58 g/10m, the length of the section is 314.87 mm, the dry basis weight of a thin section is 5.6 g/10m, and the length of the section is 3825.30 mm;
step 7, spinning, namely spinning the slub roving into slub yarns with regular long segments by a spinning machine according to a conventional spinning process, wherein the total draft multiple of the spinning machine is 30.35, the draft multiple of a rear zone is 1.46, the dry basis weight of slub segments (formed by the thick segments of the slub roving through a spinning process) of the obtained slub yarns is 2.50 g/100m, the segment length is 9556.30 mm, the dry basis weight of base yarn segments (formed by the thin segments of the slub roving through the spinning process) is 1.845 g/100m, and the segment length is 116097.86 mm;
and 8, spooling, namely pouring the four-color gray slub yarn into finished cone yarn by an automatic winder, and thus finishing the preparation of the polylactic acid color long slub yarn.
The invention patent with application number 2017102497525 also discloses a bunchy yarn production device and a production method, the device adopts a structure with a certain arc-shaped concave surface on the surface of a rear roller or a rear leather roller of a spinning machine, so that the rough yarn fed into the spinning machine is discontinuously drafted when passing through the middle roller and the rear roller, namely, part of the rough yarn passes through a rear region and is drafted, the part which does not pass through the rear region and is drafted is a bamboo section through a front region, and the part which passes through the rear region and is drafted is a base yarn section through the front region, thereby producing the yarn with the bunchy effect. However, the slub yarn produced by the slub yarn production device has a short section (determined by the size of the arc-shaped depression) which is not subjected to back zone drafting, the finally formed bamboo section is short even if subjected to front zone drafting, and the length of the section subjected to back zone drafting is limited because the diameter of the back roller or the back leather roller is fixed, namely the length of the finally formed base yarn section is limited, so that the slub yarn produced by the device can only be a short-section slub yarn, namely the bamboo section and the base yarn section are short. If the slub yarn production device disclosed by the invention patent with the application number of 2017102497525 is used, 5.6 g/10m of roving is selected, the total draft multiple of a spinning frame is 30.35, the draft multiple of a rear zone is 1.46, and the arc length corresponding to the arc-shaped recess on the rear leather roller accounts for 1/10 of the circumference of the rear leather roller, the slub yarn produced by the device has the dry basis weight of 2.69 g/100m of the slub section, the section length of 163.18mm, the dry basis weight of the base yarn section of 1.85 g/100m and the section length of 2144.23mm, and as a result of comparison, the slub yarn prepared by the method has the advantages of being longer in bamboo section and base yarn section.
Example two:
step 1, preparing raw materials, preparing 3 colors of polylactic acid colored short fibers respectively of red, blue and powder by using a conventional stock solution coloring process method, and preparing white tencel fibers;
step 5, feeding 2 red, 2 blue, 2 pink and 2 white pre-drawn strips into a cotton feeding roller in parallel at the same time as shown in figure 4, separating the strips with different colors by a strip separator, feeding the strips into a final and rear drafting zone in parallel, feeding the strips into a main drafting zone in parallel, and finally forming four-color bamboo joint strips; the long groove on the third upper roller is a rectangular groove, the arc length corresponding to the long groove 3 on the third upper roller 231 is 31.4 mm, 150 mm in length and 3mm in depth, the ratio of the arc length corresponding to the long groove 3 on the third upper roller 231 to the circumference length of the third upper roller is 2:5, the drafting multiple of a main drafting zone of the drawing frame is 5.8 times, the drafting multiple of a rear drafting zone is 1.35 times, the finally formed bamboo joint strip has the thick section dry basis weight of 24.14 g/5m, the section length of 182.12 mm, the thin section dry basis weight of 17.88 g/5m and the section length of 368.79 mm, and the ratio of the section length of the thick section of the bamboo joint strip to the section length of the thin section of 2: 4.05;
step 6, roving, namely spinning regular slub roving from the slub bars through a roving machine according to a conventional spinning process, wherein the total draft multiple of the roving machine is 5.8, the dry basis weight of a thick section of the obtained slub roving is 8.32 g/10m, the length of the section is 1056.30 mm, the dry basis weight of a thin section is 6.17 g/10m, and the length of the section is 2138.98 mm;
step 7, spinning, namely spinning the slub roving into slub yarns with regular long segments by a spinning machine according to a conventional spinning process, wherein the total draft multiple of the spinning machine is 28, the draft multiple of a rear zone is 1.46, the dry basis weight of the slub segment of the obtained slub yarn is 2.97 g/100m, the segment length is 29576.4 mm, the dry basis weight of the base yarn segment is 2.20 g/100m, and the segment length is 59891.44 mm;
and 8, spooling, namely pouring the four-color gray slub yarn into finished cone yarn by an automatic winder, and thus finishing the preparation of the polylactic acid color long slub yarn.
If the slub yarn production device disclosed by the invention patent with the application number of 2017102497525 is used, roving with the thickness of 6.17 g/10m is selected, the total draft multiple of a spinning frame is 28, the draft multiple of a rear zone is 1.46, and the arc length of the rear leather roller corresponding to the arc-shaped recess accounts for 2/5 of the circumference of the rear leather roller, the slub yarn produced by the device has the slub section dry weight of 3.22 g/100m, the section length of 602.19 mm, the base yarn section dry weight of 2.20 g/100m and the section length of 1318.8 mm, and the comparison shows that the slub yarn prepared by the method has a longer bamboo section and a longer base yarn section.
Example three:
step 1, preparing raw materials, preparing 2 colors of polylactic acid colored staple fibers by using a conventional stock solution coloring process method, wherein the polylactic acid colored staple fibers are respectively red and black, and then preparing white polyester fibers;
step 5, feeding 2 red, 2 black and 2 white pre-drawing slivers into a cotton feeding roller simultaneously in parallel, separating the slivers with different colors by a sliver separator, feeding the slivers into a final drawing area and a rear drawing area in parallel, feeding the slivers into a main drawing area in parallel, and finally forming three-color bamboo joint slivers; the long groove on the third upper roller is a rectangular groove, the arc length corresponding to the long groove 3 on the third upper roller 231 is 15.7 mm, the length is 150 mm, and the depth is 3mm, the ratio of the arc length corresponding to the long groove 3 on the third upper roller 231 to the circumference length of the third upper roller is 1:5, the drafting multiple of the main drafting zone of the drawing frame is 6.5 times, the drafting multiple of the rear drafting zone is 1.35 times, the finally formed bamboo joint strip has the dry weight of a thick section of 22.52 g/5m, the length of a section of 102.05 mm, the dry weight of a thin section of 16.68 g/5m, the length of a section of 551.07 mm, and the ratio of the length of the thick section of the bamboo joint strip to the length of the thin section of 1: 5.4;
step 6, roving, namely spinning regular slub roving from the slub bars through a roving machine according to a conventional spinning process, wherein the total draft multiple of the roving machine is 7.0, the dry basis weight of the thick section of the obtained slub roving is 6.43 g/10 mm, the section length is 714.35 mm, the dry basis weight of the thin section is 4.77 g/10m, and the section length is 3857.49 mm;
step 7, spinning, namely spinning the slub roving into slub yarns with regular long segments by a spinning machine according to a conventional spinning process, wherein the total draft multiple of the spinning machine is 35, the draft multiple of a rear zone is 1.46, the dry basis weight of the slub segment of the obtained slub yarns is 1.84 g/100m, the segment length is 25002.25 mm, the dry basis weight of the base yarn segment is 1.36 g/100m, and the segment length is 135012.15 mm;
and 8, spooling, namely pouring the three-color gray slub yarn into finished cone yarn by an automatic spooling machine, so that the preparation of the polylactic acid color long slub yarn is finished.
If the slub yarn production device disclosed by the invention patent with the application number of 2017102497525 is used, 4.77 g/10m of roving is also selected, the total draft multiple of a spinning frame is 35, the draft multiple of a rear zone is 1.46, and the arc length of the rear leather roller corresponding to the arc-shaped recess accounts for 1/5 of the circumference of the rear leather roller, the slub yarn produced by the device has the slub section dry weight of 1.99 g/100m, the section length of 376.33 mm, the base yarn section dry weight of 1.36 g/100m and the section length of 2198 mm, and the comparison shows that the slub yarn prepared by the method has longer bamboo sections and longer base yarn sections.
Example four:
step 1, preparing raw materials, namely preparing 2-color polylactic acid colored staple fibers which are respectively red and yellow by using a conventional stock solution coloring process method;
step 5, feeding 4 red and 4 yellow pre-drawing strips into a cotton feeding roller simultaneously in parallel, separating the strips with different colors by a strip separator, feeding the strips into a final and rear drafting zone in parallel, feeding the strips into a main drafting zone in parallel, and finally forming two-color bamboo joint strips; the long groove 3 on the third upper roller 231 is a rectangular groove, the arc length corresponding to the long groove 3 on the third upper roller 231 is 7.85 mm, the length is 150 mm, and the depth is 3mm, the ratio of the arc length corresponding to the long groove 3 on the third upper roller 231 to the perimeter of the third upper roller is 1:10, the drafting multiple of the main drafting area of the drawing frame is 6.086 times, the drafting multiple of the rear drafting area is 1.35 times, the finally formed bamboo joint strip has the thick section dry basis weight of 24.98 g/5m, the section length of 47.78 mm, the thin section dry basis weight of 18.5 g/5m, the section length of 580.47 mm, and the ratio of the section length of the thick section to the section length of the thin section of the bamboo joint strip is 1: 12.15;
step 6, roving, namely spinning regular slub roving from slub bars by a roving machine according to a conventional spinning process, wherein the total draft multiple of the roving machine is 6.59, the dry basis weight of a thick section of the obtained slub roving is 7.58 g/10m, the length of the section is 314.87 mm, the dry basis weight of a thin section is 5.6 g/10m, and the length of the section is 3825.30 mm;
step 7, spinning, namely spinning the slub roving into slub yarns with regular long segments by a spinning machine according to a conventional spinning process, wherein the total draft multiple of the spinning machine is 30.35, the draft multiple of a rear zone is 1.46, the dry basis weight of slub segments of the obtained slub yarns is 2.50 g/100m, the segment length is 9556.30 mm, the dry basis weight of base yarn segments is 1.845 g/100m, and the segment length is 116097.86 mm;
and 8, spooling, namely pouring the two-color gray slub yarn into finished cone yarn by an automatic spooling machine, so that the preparation of the polylactic acid color long slub yarn is finished.
Claims (9)
1. A processing method of polylactic acid colorful long slub yarn is provided, the polylactic acid colorful long slub yarn is formed by at least two kinds of fibers with different colors through end-merging into bamboo joint strips, and then spinning is carried out through a spinning process, all the fibers are polylactic acid fibers or polylactic acid fibers and other textile fibers, and the polylactic acid fibers are polylactic acid colorful short fibers prepared through stock solution coloring; the method comprises the following process steps of raw material preparation → blowing → cotton carding → head and → end and → roving → spun yarn → winding, and the fibers with different colors are respectively processed by the blowing, the cotton carding and the head combining processes to prepare corresponding pre-drawing strips, and is characterized in that: will again all kinds the drawing device is used in the processing of parallel feeding polylactic acid chromatic long slub yarn of drawing in advance simultaneously, the drawing device includes by back to preceding feeding part and the draft part that sets up, the draft part includes by preceding to the first roller that sets gradually after to, second roller to and third roller to, roller, its characterized in that under roller, third roller to including the third: the middle part of the outer surface of the third upper roller is provided with a long groove, the length direction of the long groove is parallel to the length direction of the third upper roller, and the long groove is used for accommodating all pre-drawing strips; the arc length of the third upper roller corresponding to the long groove is 1/10-2/5 of the perimeter of the third upper roller, and the depth of the long groove is larger than the diameter of the pre-drawing; and pre-drawn yarns with the same color are fed in a centralized and parallel mode to be subjected to end spinning to obtain slub strips, the slub strips are spun into slub rough yarns through a roving frame, the slub rough yarns are spun into long slub yarns through a spinning frame, and finally the long slub yarns are poured into finished cone yarns through an automatic winder.
2. The processing method of the polylactic acid colorful long slub yarn according to claim 1, characterized in that: the dry basis weight of the pre-drawing is 17.5 g/5 m-19 g/5m, and the bamboo joint strips are formed by combining 6 or 8 pre-drawing strips.
3. The processing method of the polylactic acid colorful long slub yarn according to claim 1, characterized in that: the bamboo joint strip comprises a thick section and a thin section, wherein the dry basis weight of the thick section is 21.21 g/5 m-25.33 g/5m, and the dry basis weight of the thin section is 15.71 g/5 m-18.77 g/5 m.
4. The processing method of the polylactic acid colorful long slub yarn according to claim 1, characterized in that: the total draft multiple of the roving frame is 5.8-7; the total draft multiple of the spinning frame is 28-35.
5. The processing method of the polylactic acid colorful long slub yarn according to claim 1, characterized in that: the other textile fibers are more than one of cotton, viscose, modal, tencel, terylene, chinlon, acrylic fiber, polypropylene fiber and soybean fiber.
6. The processing method of the polylactic acid colorful long slub yarn according to claim 1, characterized in that: the long groove is a rectangular groove.
7. The processing method of the polylactic acid colorful long slub yarn according to claim 1, characterized in that: a main drafting area is arranged between the first roller pair and the second roller pair, and the drafting multiple of the main drafting area is 5.8-6.5; and a back drafting area is arranged between the second roller pair and the third roller pair, and the drafting multiple of the back drafting area is 1.35.
8. The processing method of the polylactic acid colorful long slub yarn according to claim 1, characterized in that: the sliver feeding part comprises two cotton feeding rollers which are arranged up and down and a plurality of sliver dividers which are arranged at the rear sides of the cotton feeding rollers side by side, the sliver dividers are arranged along the length direction of the cotton feeding rollers at uniform intervals, and the sliver dividers are used for separating pre-drawing strips with different colors.
9. A polylactic acid colored long slub yarn produced by the process of any one of claims 1 to 8.
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