Production system of polyester fully drawn yarn

Abstract

The utility model discloses a polyester fully-drawn yarn production system which comprises a spinneret plate used for spraying out polyester melt, a windless heat preservation area, a circular blowing cooling area, an oiling nozzle, a yarn guide hook, a pre-interlacer, a yarn guide, a first hot roller, a second hot roller, a main interlacer and a winding machine which are sequentially arranged. Furthermore, the production system further comprises a brittle damage part, the brittle damage part is located between the yarn guide hook and the pre-interlacing device, the brittle damage part is provided with a rough surface layer capable of being in friction contact with a yarn strip, and the cross section of the spinneret hole is in a flat shape. The polyester fully drawn yarn produced by the production system can have lower strength without being treated by a high-temperature environment, strong alkali, alcohols and the like for multiple times, is suitable for preparing easy-to-tear base cloth, is beneficial to environmental protection, and reduces the sewage treatment cost of enterprises.

Description

TECHNICAL FIELD

[0001] The utility model relates to functional yarn field especially low strength cationic dyeing polyester full draw textured yarn, specifically relates to a production system of polyester full draw textured yarn. BACKGROUND

[0002] The base cloth of medical adhesive tape, wiring harness adhesive tape, trademark cloth and the like generally needs lower tear strength so that consumers can easily tear in use. However, the tear strength of the base cloth made of conventional synthetic fibers basically cannot meet the requirements, therefore, the commonly used material at present is cloth woven from acetate fibers, however, the source of acetate fibers is limited, the cost is relatively high, and dyeing is not easy. Based on the above problems, patent CN110846779B discloses a manufacturing method of polyester tearable cloth, which adopts strong alkali for treatment, the strong alkali contains sodium hydroxide and amine, the amount of amine is 5-50g / L, the amount of sodium hydroxide is 5-50g / L, and 6 times of treatment are carried out at 130℃; patent CN110846778A discloses a production method of polyester easy-tear cloth, which adopts strong alkali and alcohol for alternate treatment, the alkali is sodium hydroxide or sodium carbonate, the alcohol is ethylene glycol, benzyl alcohol and the like, the amount of alkali is 5-50g / L, the amount of alcohol is 5-50g / L, and 6 times of treatment are carried out at 130℃; however, the treatment methods of the two patents both claim to realize the reduction of tear strength and the easy-tear cloth can be prepared, on the one hand, they use a large amount of strong alkali, amine and alcohol, which will inevitably produce a large amount of alkaline wastewater, and the post-treatment is difficult, a large amount of resources are needed for wastewater treatment, the cost is high, and it is not conducive to environmental protection, on the other hand, they need to be treated 6 times at a temperature as high as 130℃, the energy consumption is high, and high-temperature treatment is not conducive to safety production, in addition, more processes are added, and the process is complicated. UTILITARIAN CONTENT

[0003] The utility model aims at overcoming one or more defects in the prior art, and provides an improved production system of polyester full draw textured yarn, which can have low strength without using high-temperature environment, strong alkali, alcohol and the like for multiple treatments, and is suitable for preparing easy-tear base cloth.

[0004] To achieve the above-mentioned purpose, the utility model adopts the technical scheme of:

[0005] A production system of polyester fully drawn yarn, the production system comprises, which are sequentially arranged: a spinneret for spraying polyester melt, a windless heat preservation zone, a ring blowing air cooling zone, an oiling nozzle, a guide hook, a pre-networker, a guide, a first hot roller, a second hot roller, a main networker and a winding machine, the spinneret is formed with a spinneret hole, in particular, the production system further comprises a fragile damage piece, the fragile damage piece is located between the guide hook and the pre-networker, the fragile damage piece has a rough surface layer capable of rubbing contact with the yarn, and the spinneret hole is flat in cross section.

[0006] According to some preferred aspects of the utility model, the fragile damage piece comprises a mounting part, a fragile damage part formed on the mounting part, the rough surface layer is formed on the surface of the fragile damage part, the fragile damage part comprises a yarn hole allowing the yarn to pass through and a gap allowing the yarn to freely enter and exit, and the yarn hole and the gap are communicated.

[0007] In some embodiments of the utility model, the mounting part and the fragile damage part are integrally formed to constitute the fragile damage piece.

[0008] According to some preferred aspects of the utility model, the fragile damage piece can make the yarn leaving the yarn hole extend along a first direction, the vertical normal line of the end face of the pre-networker for the yarn to enter extends along a second direction, and the first direction intersects with the second direction.

[0009] Further, the first direction intersects with the second direction and forms an included angle of 10°-30°, and further an included angle of 15°-25°.

[0010] In some embodiments of the utility model, the material of the fragile damage piece is ceramic.

[0011] According to some preferred aspects of the utility model, the surface roughness Ra of the rough surface layer is 0.5-1.5; further, 0.7-1.1.

[0012] According to some preferred aspects of the utility model, the length-width ratio of the spinneret hole flat in cross section is greater than or equal to 5; further, the length-width ratio of the spinneret hole flat in cross section is 5-8.

[0013] According to some preferred aspects of the utility model, the guide is a U-shaped ceramic piece.

[0014] In some embodiments of the utility model, the height of the windless heat preservation zone is 50-75mm.

[0015] In some embodiments of the present application, the polyester melt is a cationic dyeable polyester melt having an intrinsic viscosity of 0.52-0.57 dL / g. According to one aspect of the present application, the polyester melt is a cationic dyeable polyester melt obtained by introducing dimethyl isophthalate having a polar group sodium sulfonate into polyester chips, which is commercially available or prepared according to conventional methods in the art, and will not be described in detail here.

[0016] In some embodiments of the present application, the production system further comprises a melt booster pump, a melt cooler and a spinning beam arranged in sequence, and the spinneret is arranged in the spinning beam.

[0017] Thanks to the above technical solution, the present application has the following advantages compared with the prior art:

[0018] Based on the defects of limited raw material sources, high cost, or the need for multiple treatments in high temperature environment, strong alkali, alcohol, etc. in the existing preparation of medical adhesive tape, wire harness adhesive tape and easy-to-tear cloth for trademark cloth, the present application innovatively provides an improved production system, which is based on FDY production equipment and uses a spinneret with a flat cross-section to spray polyester melt, so that the as-spun fiber has a large heteromorphism. The special fiber cross-section can promote stress concentration and breakage of the yarn when subjected to external force. When the oiled yarn is further treated by a brittle damage member with a rough surface layer, the rough surface not only causes friction brittle damage to the oiled yarn, but also does not cause excessive damage to the yarn due to the presence of oil, resulting in obvious burr and hair phenomenon. Moreover, the rough surface can also cause slight vibration of the yarn during friction, which can promote the transfer, penetration and dispersion of oil in the yarn, and make the spinning oil evenly distributed on the surface of each filament, so that the filament has better bundling property and the yarn runs more stably during spinning.

[0019] Further, when the brittle damage member and the pre-networker are arranged in a specific arrangement, the yarn located between the brittle damage member and the pre-networker can enter the pre-networker at an included angle alpha, so that the brittle damage effect of the rough surface on the yarn can be fully utilized and adjusted.

[0020] The above production system of the present application not only can achieve the ideal brittle damage effect of polyester yarn without multiple treatments in high temperature environment, strong alkali, alcohol, etc., and the resulting cloth has a low tear strength, but also only needs to be embedded in a conventional FDY production system, greatly shortening the process, reducing the cost, saving energy, and not producing additional strong alkali, alcohol wastewater, etc., which is conducive to environmental protection and the implementation of industrialized mass production. BRIEF DESCRIPTION OF DRAWINGS

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the production system for fully drawn polyester yarn in an embodiment of this utility model;

[0023] Figure 2 This is a schematic diagram showing the angle of the guide yarn when the brittle components and the pre-networker are arranged in a specific manner in the production system of fully drawn polyester yarn in this embodiment of the present invention.

[0024] Figure 3 This is a schematic diagram of the structure of the brittle component in an embodiment of this utility model;

[0025] Figure 4 This is one of the structural schematic diagrams of the spinneret orifice with a flat cross-section according to this utility model;

[0026] Figure 5 for Figure 4 A schematic diagram of the cross-section of polyester fibers ejected from the spinneret shown.

[0027] Figure 6 This is the second schematic diagram of the structure of the spinneret orifice with a flat cross-section of this utility model;

[0028] Figure 7 for Figure 6 A schematic diagram of the cross-section of polyester fibers ejected from the spinneret shown.

[0029] In the attached diagram, the following are the reference numerals: 1. Melt booster pump; 2. Melt cooler; 3. Spinning box; 4. Circular air cooling zone; 5. Oil nozzle; 6. Guide hook; 7. Fragile part; 71. Mounting part; 72. Fragile part; 721. Wire hole; 722. Clearance gap; 73. Rough surface layer; 8. Pre-networker; 9. U-shaped ceramic part; 10. First hot roller; 11. Second hot roller; 12. Main networker; 13. Winding machine; 14. Spinneret; 15. Fiber; 16. Polyester fiber. Detailed Implementation

[0030] For the above purposes, features and advantages of the present application to be more apparent and understandable, the present application will be described in detail below with reference to the accompanying drawings and specific embodiments. In the following description, a number of specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different ways beyond the specific embodiments described and claimed in this disclosure and as such should not be limited to the embodiments set forth in the following description. Instead, they should be understood to cover all alternatives, modifications and equivalents falling within the scope of the application.

[0031] In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0032] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and other terms should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0034] It should be noted that when an element is referred to as "fixed to" or "provided on" another element, it can be directly on the other element or there can be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element.

[0035] The preferred embodiments of the present application will be described in detail below. Figures 1 to 7 The preferred embodiments of the present application will be described in detail below.

[0036] Reference is made to Figures 1 to 4 and Figure 6The utility model provides a kind of production system of dacron full draw texturing yarn, the production system includes the spinneret for being used to spray out polyester melt, no wind insulation area, ring blowing cooling area 4, oil nozzle 5, guide hook 6, fragile loss 7, pre-networker 8, guide, first hot roller 10, second hot roller 11, main networker 12 and winding machine 13 in turn, spinneret is formed with spinneret hole 14, fragile loss 7 has the rough surface layer 73 capable of rubbing contact with sliver 15, the cross section of spinneret hole 14 is flat.

[0037] Further, the production system further includes melt booster pump 1, melt cooler 2, spinning beam 3 in turn, spinneret is arranged in spinning beam 3.

[0038] Further, fragile loss 7 includes mounting portion 71, fragile loss portion 72 formed on mounting portion 71, rough surface layer 73 is formed on the surface of fragile loss portion 72, mounting portion 71 is used to install and fix entire fragile loss 7 on certain support component, fragile loss portion 72 includes silk hole 721 allowing sliver 15 to pass through and give way gap 722 allowing sliver to go in and out freely, silk hole 721 is communicated with give way gap 722;Mounting portion 71, fragile loss portion 72 can be integrally formed to constitute fragile loss 7, the material of fragile loss 7 can be ceramic, fragile loss 7 can make sliver 15 away from silk hole 721 extend along the first direction, the vertical normal line of the end surface of pre-networker 8 for sliver 15 to enter extends along the second direction, the first direction intersects with the second direction, the intersection of two directions forms the included angle of 10 °-30 °, further can be 15 °-25 °, for example, can be 15 °, 16 °, 17 °, 18 °, 19 °, 20 °, 21 °, 22 °, 23 °, 24 ° and so on, that is, the sliver between fragile loss 7 and pre-networker 8 enters pre-networker 8 with included angle α, the acute angle included angle between the sliver entering pre-networker 8 and the vertical normal line of the end surface of pre-networker 8 for sliver to enter is the above-mentioned included angle α.

[0039] Further, the surface roughness Ra of rough surface layer 73 is 0.5-1.5, preferably can be 0.7-1.1, for example, can be 0.7, 0.72, 0.75, 0.78, 0.80, 0.83, 0.85, 0.88, 0.9, 0.92, 0.95, 0.96, 0.98, 1.0, 1.05, 1.08, 1.1 and so on, suitable roughness is more conducive to damaging sliver while not causing excessive fragile loss, and sliver enters from the lower part of the rear part of silk hole and extends out from the upper part of the front part of silk hole, so that rough surface layer can have at least two parts contact with sliver;The length-width ratio of spinneret hole 14 with flat cross section is greater than or equal to 5 (length is recorded as L, width is recorded as W, that is L / W≥5), preferably, the length-width ratio is 5-8, for example, can be 5, 5.5, 6, 6.5, 7, 7.5, 8 and so on.

[0040] Furthermore, the guide wire is a U-shaped ceramic part 9, and the polyester melt is a cationic dyeable polyester melt with an intrinsic viscosity of 0.52-0.57 dL / g, such as 0.52 dL / g, 0.53 dL / g, 0.54 dL / g, 0.55 dL / g, 0.56 dL / g, 0.57 dL / g, etc.

[0041] See Figure 4 As shown, an exemplary schematic diagram of a spinneret 14 with a flat cross-section is provided. This cross-section is generally wavy, and the cross-section of the extruded polyester fiber 16 is also generally wavy and flat. See, for example, [reference needed]. Figure 5 As shown, since the polyester melt is not completely uniform after being sprayed, the cross-section of the obtained fiber filament exhibits some slight differences at various wavy points. This type of polyester fiber 16 has a large number of grooves and a large fiber specific surface area, which will give it better moisture absorption, perspiration wicking and breathability.

[0042] See Figure 6 As shown, an exemplary schematic diagram of a spinneret 14 with a flat cross-section is provided. The cross-section of this spinneret is generally elongated and flat, and the extruded polyester fiber 16 also has a generally elongated and flat cross-section. See, for example, [reference needed]. Figure 7 As shown, since the polyester melt is not completely regular after being sprayed out, the cross-sectional profile of the obtained fiber filaments exhibits some slight differences and does not show a completely linear extension, but rather has some slight convexity and undulation.

[0043] This polyester fiber 16 has a large degree of anisotropy. The special fiber cross section can cause the yarn to easily generate stress concentration and break when subjected to external force, reducing the fiber's breaking strength and making it beneficial for producing fabrics with low tear strength.

[0044] During operation, the polyester melt is transported through the melt pipeline, passes through the melt booster pump 1, melt cooler 2, and spinning box 3, and is then ejected from the spinneret 14 with a flat cross-section. It is kept warm in the windless heat preservation zone (not shown), cooled in the ring blowing cooling zone 4, oiled by the oil nozzle 5, and the brittle filaments with the rough surface layer 73 are damaged by the brittle part 7. The pre-networker 8 evens the oil, the first hot roller 10 and the second hot roller 11 stretch and shape it, the main networker 12 forms the network and interweaves it, and the winding machine 13 winds it into shape. Among them, the post-pump pressure of melt booster pump 1 is 16-20MPa, the outlet temperature of melt cooler 2 is 274-277℃, the temperature of spinning box 3 is 280-285℃, the height of windless heat preservation zone is 50-75mm, the speed of first hot roller 10 is 1800-3500m / min, the temperature of first hot roller 10 is 60-90℃, the speed of second hot roller 11 is 4000-5100m / min, the temperature of second hot roller 11 is 80-130℃, and the winding speed of winding machine 13 is 4000-5000m / min.

[0045] According to this invention, the tensile strength of the prepared fully drawn polyester yarn is less than or equal to 2.2 cN / dtex, and can be further 1.8-2.2 cN / dtex; the elongation at break is 20%-30%, and the single filament fineness is 0.5-3.7 dtex. It can be used in the preparation of medical tapes, wire harness tapes, or label fabrics.

[0046] This production system will be used in specific preparation processes:

[0047] Case 1:

[0048] Using the above Figures 1 to 4 The production system with the structure shown includes the following specific preparation process:

[0049] A cationic dyeable polyester melt with an intrinsic viscosity of 0.53 dL / g is transported through a melt pipeline, passing through a melt booster pump, a melt cooler, and a spinning box, before finally exiting... Figure 4 The yarn is ejected from a spinneret with a roughly wavy and flat cross-section (the length-to-width ratio of the spinneret is 5.5), kept warm in a windless heat preservation zone, cooled in a ring-blown cooling zone, oiled by an oil nozzle, damaged brittle parts, oiled by a pre-networker, stretched and shaped by the first and second hot rollers, webbed by the main networker, and wound by a winding machine to obtain 83dtex / 36f wavy and flat low-strength fully drawn polyester yarn.

[0050] The preparation process parameters of the low-strength polyester fully drawn yarn are as follows: the post-pump pressure of the melt booster pump is 18 MPa, the outlet temperature of the melt cooler is 275 ℃, the temperature of the spinning beam is 282 ℃, the height of the windless heat preservation zone is 75 mm, the cooling temperature of the circular air blowing cooling zone is 20 ℃, the oiling rate is 0.95%, the included angle a is 18°, the surface roughness Ra of the rough surface layer is 0.88, the speed of the first heat roller is 3025 m / min, the temperature of the first heat roller is 68 ℃, the speed of the second heat roller is 4457 m / min, the temperature of the second heat roller is 115 ℃, and the winding speed is 4400 m / min.

[0051] The physical properties of the prepared 83 dtex / 36 f low-strength polyester fully drawn yarn are as follows: fineness (test standard: GB / T 8960-2015, the same below) 83.2 dtex, breaking strength (test standard: GB / T 8960-2015, the same below) 1.95 cN / dtex, elongation at break (test standard: GB / T 8960-2015, the same below) 23.4%, boiling water shrinkage (test standard: GB / T 8960-2015, the same below) 7.4%, and network degree (test standard: GB / T 8960-2015, the same below) 9 / m.

[0052] Case 2:

[0053] The production system shown in the above Figures 1 to 3 、 Figure 6 structure, and the specific preparation process includes:

[0054] The cationic dyeable polyester melt with an intrinsic viscosity of 0.53 dL / g is conveyed through the melt pipeline, passes through a melt booster pump, a melt cooler, a spinning beam, and is sprayed out of the cross-sectionally flat-shaped spinneret (the length-width ratio of the spinneret is 6.0) shown in Figure 6 , is heat preserved in a windless heat preservation zone, is cooled in a circular air blowing cooling zone, is oiled by an oiling nozzle, is brittle damaged by a brittle damage piece, is oil-uniformed by a pre-networking device, is stretched and shaped by a first heat roller and a second heat roller, is interlaced by a main networking device, is wound and formed by a winding machine, and 83 dtex / 36 f low-strength polyester fully drawn yarn is prepared.

[0055] The preparation process parameters of the low-strength polyester fully drawn yarn are as follows: the pump post pressure of the melt booster pump is 18 MPa, the outlet temperature of the melt cooler is 275 DEG C, the temperature of the spinning beam is 282 DEG C, the height of the no-wind heat preservation zone is 75 mm, the cooling temperature of the ring blowing air cooling zone is 20 DEG C, the oiling rate is 0.95%, the included angle a is 18 DEG, the surface roughness Ra of the rough surface layer is 0.88, the speed of the first heat roller is 3025 m / min, the temperature of the first heat roller is 68 DEG C, the speed of the second heat roller is 4457 m / min, the temperature of the second heat roller is 115 DEG C, and the winding speed is 4400 m / min.

[0056] The physical properties of the prepared 83 dtex / 36 f flat type low-strength polyester fully drawn yarn are as follows: the fineness is 82.7 dtex, the breaking strength is 1.91 cN / dtex, the breaking elongation is 22.1%, the boiling water shrinkage is 7.6%, and the network degree is 10.5 / m.

[0057] Case 3 (comparative case):

[0058] The basic difference between the case 1 and the case 3 is that the cross section of the spinning hole is a circular hole, and the brittle damage part is not arranged in the production system. The physical properties of the prepared polyester fully drawn yarn are as follows: the fineness is 83 dtex, the breaking strength is 3.15 cN / dtex, the breaking elongation is 28%, the boiling water shrinkage is 7.2%, and the network degree is 10 / m.

[0059] It can be seen that the polyester fully drawn yarn produced by the production system has lower strength, and is more beneficial to the preparation of the easy-tear base cloth.

[0060] The above examples are only for illustrating the technical concept and characteristics of the utility model, and the purpose is to enable the person skilled in the art to understand the content of the utility model and implement it, and cannot limit the protection scope of the utility model. Any equivalent change or modification according to the spirit and essence of the utility model shall be covered in the protection scope of the utility model.

Claims

1. A production system of polyester fully drawn yarn, the production system comprising, in order, a spinneret for discharging a polyester melt, a draftless heat retaining zone, a ring blow air cooling zone, an oiling nozzle, a guide hook, a pre-networker, a guide, a first heat roller, a second heat roller, a main networker, and a winding machine, the spinneret having a spinneret hole formed thereon, characterized in that, The production system further comprises a fragile member between the guide hook and the pre-networker, the fragile member having a rough surface layer capable of rubbing contact with the yarn, and the spinneret has a flattened cross section.

2. The production system of polyester fully drawn yarn according to claim 1, characterized in that, The fragile member comprises a mounting portion, a fragile portion formed on the mounting portion, and a rough surface layer formed on the surface of the fragile portion, the fragile portion comprising a yarn hole allowing the yarn to pass through and a clearance allowing the yarn to freely enter and exit, and the yarn hole and the clearance are in communication.

3. The production system of polyester fully drawn yarn according to claim 2, characterized in that, The mounting portion and the fragile portion are integrally formed to constitute the fragile member.

4. The production system of polyester fully drawn yarn according to claim 2, characterized in that, The fragile member allows the yarn leaving the yarn hole to extend in a first direction, and a vertical normal line of an end surface of the pre-networker for the yarn to enter extends in a second direction, and the first direction intersects the second direction.

5. The production system of polyester fully drawn yarn according to claim 4, characterized in that, The first direction intersects the second direction and forms an included angle of 10°-30°.

6. The production system of polyester fully drawn yarn according to claim 1, characterized in that, The fragile member is made of ceramic.

7. The production system of polyester fully drawn yarn according to claim 1, characterized in that, The rough surface layer has a surface roughness Ra of 0.5-1.5; and / or, the spinneret with the flattened cross section has an aspect ratio of greater than or equal to 5.

8. The production system of polyester fully drawn yarn according to claim 1, characterized in that, The rough surface layer has a surface roughness Ra of 0.7-1.1; and / or, the spinneret with the flattened cross section has an aspect ratio of 5-8.

9. The production system of polyester fully drawn yarn according to claim 1, characterized in that, The guide hook is a U-shaped ceramic member; and / or, the height of the windless heat preservation zone is 50-75 mm.

10. The production system of polyester fully drawn yarn according to claim 1, characterized in that, The polyester melt uses a cationic dyeable polyester melt with an intrinsic viscosity of 0.52-0.57 dL / g; and / or, the production system further comprises a melt booster pump, a melt cooler, and a spinning box arranged in sequence, and the spinneret is arranged in the spinning box. The polyester melt uses a cationic dyeable polyester melt with an intrinsic viscosity of 0.52-0.57 dL / g; and / or, the production system further comprises a melt booster pump, a melt cooler, and a spinning box arranged in sequence, and the spinneret is arranged in the spinning box.

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