A kind of polyester hollow textured yarn and production method thereof

Abstract

The present invention relates to a polyester hollow deformed yarn and a production method thereof, and the production method comprises the following steps: first, preparing polyester hollow filaments by melt spinning; second, subjecting the polyester hollow filaments to secondary processing on a BCF spinning device, specifically: subjecting the polyester hollow filaments to oil treatment, first pre-network treatment, first hot drawing, deformation treatment, cooling and shaping, filament separation treatment, first main network treatment, winding and forming, and obtaining polyester hollow deformed yarns. The present application adopts a BCF spinning device to perform secondary processing on polyester hollow filaments, causing the filaments to be instantly puffed and deformed under a preset high temperature and high pressure environment, and adopts a negative pressure process to cool and shape the filaments, and this process produces natural curling, which enhances the resilience of the fiber while maintaining the high hollow characteristics, thereby improving the overall performance and application value of the product.

Description

Technical Field

[0001] The invention relates to the technical field of spinning, and in particular to a polyester hollow textured yarn and a production method thereof. Background Art

[0002] With the rapid development of social economy, the living standards of residents have been significantly improved, and higher requirements have been put forward for clothing quality. High-medium hollow polyester filaments are widely used in thermal underwear, vests, sweaters and winter sportswear due to their light, warm and soft characteristics. However, this material has the problem of insufficient resilience, and the clothes are prone to bulging and wrinkling during wearing, which affects the comfort and aesthetics of wearing, and has become a technical problem that needs to be solved urgently.

[0003] At present, the industry is trying to improve the resilience of high-medium hollow polyester filaments through various methods. Among them, POY-DTY texturing process and secondary processing of polyester high-medium hollow FDY directly on texturing equipment are two common methods. Unfortunately, these methods often fail to retain the hollowness of polyester filaments during the processing, resulting in a significant reduction in the thermal insulation performance of the final product.

[0004] Another attempt is to use air texturing technology to prepare polyester filaments. Although this method can retain high hollowness, the resulting filament curl structure is not stable enough, mainly showing increased fluffiness rather than real elasticity. Therefore, this method cannot meet the requirements of high hollowness and high curl rate at the same time.

[0005] In summary, although the existing technology has tried to solve the problem of insufficient resilience of high-medium hollow polyester filaments to a certain extent, an effective method has not yet been found to simultaneously retain its high-medium hollowness and give it sufficient resilience. This not only limits the application of high-medium hollow polyester filaments in the field of high-end clothing, but also affects the wearing experience of consumers. Therefore, the development of a new preparation process for high-medium hollow polyester filaments to achieve high hollowness and high curvature at the same time has become a technical problem that needs to be solved urgently. Through this study, we hope to find an effective solution to meet the market's urgent demand for high-quality clothing materials. Summary of the invention

[0006] In order to solve the above technical problems, the present application provides a polyester hollow textured yarn and a production method thereof.

[0007] To achieve the above objectives, this application is implemented through the following technical solutions:

[0008] The present application provides a method for producing polyester hollow textured yarn, comprising the following steps:

[0009] S1. preparing polyester hollow filaments by melt spinning;

[0010] S2. The polyester hollow filaments are subjected to secondary processing on a BCF spinning device, specifically: the polyester hollow filaments are subjected to oil treatment, a first pre-network treatment, a first hot stretching, a deformation treatment, cooling and shaping, a filament separation treatment, a first main network treatment, and winding and forming to obtain polyester hollow deformation filaments.

[0011] As a further improvement of the present application, in step S1, the polyester hollow filament has the following characteristics: a total line density of 55 to 110 dtex, a single filament line density of 1.5 to 3.1 dtex, and a hollowness of 30% to 40%.

[0012] As a further improvement of the present application, the polyester hollow filament is prepared by the following steps: the slices are sequentially conveyed, dried, extruded and melted, filtered, metered, spun, cooled and solidified, oiled, pre-networked, second hot stretching, third hot stretching, main networked, and wound to obtain polyester hollow filaments.

[0013] As a further improvement of the present application, the temperature of the extrusion melting is 280-300°C, the temperature of the spinning is 265-290°C, the temperature of the cooling and solidification is 20-25°C, the wind speed of the cooling and solidification is 1.8-2.6 m / sec, the temperature of the second hot stretching is 80-92°C, the temperature of the third hot stretching is 125-137°C, the pressure of the main network treatment is 0.2-0.35 MPa, and the winding speed of the winding molding is 3600-4200m / min.

[0014] As a further improvement of the present application, in step S2, the pressure of the deformation treatment is 0.6-0.8 MPa, and the temperature of the deformation treatment is 135-155°C.

[0015] As a further improvement of the present application, in step S2, the oiling rate of the oil treatment is 0.8-1.2%.

[0016] As a further improvement of the present application, in step S2, the cooling and shaping pressure is 0.02-0.05 MPa.

[0017] As a further improvement of the present application, in step S2, the wire separation treatment includes a first step of wire separation treatment and a second step of wire separation treatment, wherein: the rotation speed of the first wire separation roller used for the first step of wire separation treatment is 2000-2600 m / min, and the rotation speed of the second wire separation roller used for the second step of wire separation treatment is 2020-2620 m / min.

[0018] As a further improvement of the present application, in step S2, the pressure of the main network treatment is 0.3-0.45 MPa, and the winding speed of the winding forming is 2000-2500 m / min.

[0019] To achieve the above objectives, the present application also provides a polyester hollow textured yarn prepared by the above-mentioned production method, wherein the hollowness of the polyester hollow textured yarn is 25% to 35%, and the curling rate is 20% to 40%.

[0020] The beneficial effect of the present application is that the present application adopts a BCF spinning device to perform secondary processing on polyester hollow filaments. The device uses a deformation puffing chamber to deform the filaments, which can provide a preset high temperature and high pressure environment for the filaments, and can make the filaments instantly puff and deform. The cooling and shaping adopts a negative pressure process. Under the negative pressure environment, the cooling medium can flow through the surface of the filaments faster, taking away the heat generated by the deformation of the filaments, thereby accelerating the cooling process, helping the filaments to quickly reach a stable state, and preventing excessive deformation or heat damage, thereby obtaining filaments with excellent high hollowness and curl.

[0021] In addition, negative pressure helps the filaments maintain a stable shape in the cooling drum groove and reduces fiber disorder caused by air flow disturbance. In this way, the fiber's curl, fluffiness and other physical properties can be better maintained, thus producing filaments with excellent performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of the BCF spinning device provided in this application.

[0023] In the figure: 1. raw yarn rack; 2. oiling roller; 3. first pre-network device; 4. feeding roller; 5. first pair of drafting rollers; 6. second pair of drafting rollers; 7. third pair of drafting rollers; 8. deformation and puffing chamber; 9. cooling drum; 10. first wire separation roller; 11. second wire separation roller; 12. first main network device; 13. winding machine. DETAILED DESCRIPTION

[0024] The following will be combined with the embodiments of the present application to clearly and completely describe the technical solution of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0025] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below in conjunction with specific implementation methods.

[0026] In order to make the polyester filament have both high hollowness and high crimp rate, the present application proposes the following technical solution:

[0027] The present application provides a method for producing polyester hollow textured yarn, comprising the following steps:

[0028] S1. preparing polyester hollow filaments by melt spinning;

[0029] S2. The polyester hollow filaments are subjected to secondary processing on a BCF spinning device (bulked filament spinning device), specifically: the polyester hollow filaments are sequentially subjected to oil treatment, a first pre-network treatment, a first hot stretching, a deformation treatment, cooling and shaping, a filament separation treatment, a first main network treatment, and winding and forming to obtain polyester hollow deformed filaments.

[0030] In an optional embodiment, in step S1, the polyester hollow filament has the following characteristics: a total line density of 55 to 110 dtex, a single filament line density of 1.5 to 3.1 dtex, and a hollowness of 30% to 40%.

[0031] In an optional embodiment, the polyester hollow filaments are prepared by the following steps: the slices are sequentially conveyed, dried, extruded and melted, filtered, metered, spun, cooled and solidified, oiled, pre-networked, second hot stretching, third hot stretching, main networked, and wound to obtain polyester hollow filaments.

[0032] In an optional embodiment, the temperature of the extrusion melting is 280-300°C, and the temperature of the spinning is 265-290°C. The temperature of the cooling solidification is 20-25°C, the wind speed of the cooling solidification is 1.8-2.6 m / sec, the temperature of the second hot stretching is 80-92°C, the temperature of the third hot stretching is 125-137°C, the pressure of the main network treatment is 0.2-0.35 MPa, and the winding speed of the winding forming is 3600-4200 m / min. Preferably, the speed of the drawing roller used in the second hot stretching is 1800-2500 m / min, and the speed of the drawing roller used in the third hot stretching is 3700-4300 m / min.

[0033] In an optional embodiment, in step S2, the pressure of the deformation treatment is 0.6-0.8 MPa, and the temperature of the deformation treatment is 135-155°C.

[0034] In an optional embodiment, in step S2, the oil treatment has an oiling rate of 0.8-1.2%.

[0035] In an optional embodiment, in step S2, the cooling and shaping pressure is 0.02-0.05 MPa.

[0036] In an optional embodiment, in step S2, the wire separation treatment includes a first step of wire separation treatment and a second step of wire separation treatment, wherein: the rotation speed of the first wire separation roller used in the first step of wire separation treatment is 2000-2600 m / min, and the rotation speed of the second wire separation roller used in the second step of wire separation treatment is 2020-2620 m / min.

[0037] In an optional embodiment, in step S2, the pressure of the main network treatment is 0.3-0.45 MPa, and the winding speed of the winding forming is 2000-2500 m / min.

[0038] In an optional embodiment, the present application also provides a BCF spinning device, such as Figure 1 As shown, it includes a raw silk frame 1, an oiling roller 2, a first pre-network device 3, a feeding roller 4, a first pair of stretching rollers 5, a second pair of stretching rollers 6, a third pair of stretching rollers 7, a deformation and puffing chamber 8, a cooling drum 9, a first wire separation roller 10, a second wire separation roller 11, a first main network device 12, and a winding machine 13. The polyester hollow filaments are subjected to secondary processing on the BCF spinning device, specifically, after the polyester hollow filaments are put on the raw yarn rack 1, they are successively subjected to oil treatment by the oiling roller 2, the first pre-network device 3 is subjected to the first pre-network treatment, and they successively enter the first pair of drafting rollers 5, the second pair of drafting rollers 6, and the third pair of drafting rollers 7 through the feeding roller 4 for the first hot drafting, enter the deformation puffing chamber 8 for deformation treatment, and then undergo cooling and shaping treatment by the cooling drum 9, and then undergo filament separation treatment by the first filament separation roller 10 and the second filament separation roller 11, undergo filament separation treatment by the first main network device 12, and then undergo winding and forming by the winding machine 13 to obtain the polyester hollow deformed filaments.

[0039] In an optional embodiment, the temperature of the first pair of drafting rollers 5, the second pair of drafting rollers 6, and the third pair of drafting rollers 7 are all set to 0°, and the rotation speeds of the first pair of drafting rollers 5, the second pair of drafting rollers 6, and the third pair of drafting rollers 7 are all set to 2000-2500 m / min. The rotation speed of the cooling drum 9 is set to 20-23 r / min.

[0040] This application uses a BCF spinning device to perform secondary processing on polyester hollow filaments. The device uses a deformation and expansion chamber to deform the filaments, which can provide a preset high temperature and high pressure environment for the filaments, and can make the filaments expand and deform instantly. The cooling and shaping process adopts a negative pressure process. Under the negative pressure environment, the cooling medium can flow through the surface of the filaments faster, taking away the heat generated by the deformation of the filaments, thereby accelerating the cooling process, helping the filaments to quickly reach a stable state, and preventing excessive deformation or heat damage, thereby obtaining filaments with excellent high hollowness and curl.

[0041] In addition, negative pressure helps the filaments maintain a stable shape in the cooling drum groove and reduces fiber disorder caused by air flow disturbance. In this way, the fiber's curl, fluffiness and other physical properties can be better maintained, thus producing filaments with excellent performance.

[0042] In order to verify that the technical solution of the present application has excellent effects, the following examples are provided for verification.

[0043] Example 1

[0044] This embodiment provides a method for producing polyester hollow textured yarn, comprising the following steps:

[0045] First, a polyester hollow filament is prepared by melt spinning, and the polyester hollow filament has the following characteristics: a total density of 110 dtex, a single filament density of 3.1 dtex, and a hollowness of 40%. The specific preparation process of the polyester hollow filament is as follows: the slices are sequentially conveyed, dried, extruded and melted, filtered, metered, spun, cooled and solidified, oiled, pre-networked, second hot stretching, third hot stretching, main network treatment, and wound to obtain polyester hollow filaments. Among them: the extrusion melting temperature is 300 ° C, the spinning temperature is 290 ° C, the cooling and solidification temperature is 25 ° C, the cooling and solidification wind speed is 2.6 m / sec, the second hot stretching temperature is 92 ° C, the third hot stretching temperature is 137 ° C, the main network treatment pressure is 0.35 MPa, and the winding speed of the winding is 4200 m / min.

[0046] Secondly, the polyester hollow filaments are subjected to secondary processing on a BCF spinning device, specifically: the polyester hollow filaments are sequentially subjected to oil treatment, a first pre-network treatment, a first hot stretching, a deformation treatment, cooling and shaping, a filament separation treatment, and a first main network treatment to obtain polyester hollow deformation yarns. The product rule is 110dtex / 36f. The obtained polyester hollow deformation yarns have excellent high hollowness and resilience, with a single yarn fineness of 3.1dtex, a hollowness of 31%, and a curling rate of 34%.

[0047] Wherein: the oiling rate of the oil treatment is 1.2%, three pairs of drafting rollers are provided in the first hot drafting process to perform hot drafting treatment on the fibers, the temperatures of the three pairs of drafting rollers are all set to 0°, the speed of the first pair of drafting rollers is 2475m / min, the speed of the second pair of drafting rollers is 2511m / min, and the speed of the third pair of drafting rollers is 2525m / min, the pressure of the deformation treatment is 0.8MPa, the temperature of the deformation treatment is 155°C, the pressure of the cooling and shaping is 0.05MPa, and the speed of the cooling drum used for the cooling and shaping is 23r / min. The filament separation treatment includes the first filament separation treatment and the second filament separation treatment, wherein: the speed of the first filament separation roller used for the first filament separation treatment is 2600 m / min, and the speed of the second filament separation roller used for the second filament separation treatment is 2620 m / min. The pressure of the main network treatment is 0.45 MPa, and the winding speed of the winding forming is 2500m / min.

[0048] Example 2

[0049] This embodiment provides a method for producing polyester hollow textured yarn, comprising the following steps:

[0050] First, a polyester hollow filament is prepared by melt spinning, and the polyester hollow filament has the following characteristics: a total density of 55 dtex, a single filament density of 1.5 dtex, and a hollowness of 30%. The specific preparation process of the polyester hollow filament is as follows: the slices are sequentially conveyed, dried, extruded and melted, filtered, metered, spun, cooled and solidified, oiled, pre-networked, second hot stretching, third hot stretching, main network treatment, and wound to form a polyester hollow filament. Among them: the extrusion melting temperature is 280°C, the spinning temperature is 265°C, the cooling and solidification temperature is 20°C, the cooling and solidification wind speed is 1.8 m / sec, the second hot stretching temperature is 80°C, the third hot stretching temperature is 125°C, the main network treatment pressure is 0.2MPa, and the winding speed of the winding is 3600 m / min.

[0051] Secondly, the polyester hollow filaments are subjected to secondary processing on a BCF spinning device, specifically: the polyester hollow filaments are sequentially subjected to oil treatment, a first pre-network treatment, a first hot stretching, a deformation treatment, cooling and shaping, a filament separation treatment, and a first main network treatment to obtain polyester hollow deformation yarns with a product specification of 55dtex / 36f. The obtained polyester hollow deformation yarns have excellent high hollowness and resilience, with a single yarn fineness of 1.5dtex, a hollowness of 27%, and a curling rate of 40%.

[0052] Wherein: the oiling rate of the oil treatment is 0.8%, three pairs of drafting rollers are provided in the first hot drafting process to perform hot drafting treatment on the fibers, the temperatures of the three pairs of drafting rollers are all set to 0°, the speed of the first pair of drafting rollers is 2133m / min, the speed of the second pair of drafting rollers is 2155m / min, and the speed of the third pair of drafting rollers is 2170m / min, the pressure of the deformation treatment is 0.6MPa, the temperature of the deformation treatment is 135°C, the pressure of the cooling and shaping is 0.02MPa, and the speed of the cooling drum used for the cooling and shaping is 20r / min. The filament separation treatment includes the first filament separation treatment and the second filament separation treatment, wherein: the speed of the first filament separation roller used for the first filament separation treatment is 2000 m / min, and the speed of the second filament separation roller used for the second filament separation treatment is 2020 m / min. The pressure of the main network treatment is 0.3 MPa, and the winding speed of the winding forming is 2000 m / min.

[0053] Example 3

[0054] This embodiment provides a method for producing polyester hollow textured yarn, comprising the following steps:

[0055] First, a polyester hollow filament is prepared by melt spinning, and the polyester hollow filament has the following characteristics: a total density of 80 dtex, a single filament density of 2.2 dtex, and a hollowness of 35%. The specific preparation process of the polyester hollow filament is as follows: the slices are sequentially conveyed, dried, extruded and melted, filtered, metered, spun, cooled and solidified, oiled, pre-networked, second hot stretching, third hot stretching, main network treatment, and wound to obtain polyester hollow filaments. Among them: the extrusion melting temperature is 290°C, the spinning temperature is 280°C, the cooling and solidification temperature is 23°C, the cooling and solidification wind speed is 2.1 m / sec, the second hot stretching temperature is 85°C, the third hot stretching temperature is 130°C, the main network treatment pressure is 0.3MPa, and the winding speed of the winding is 3900 m / min.

[0056] Secondly, the polyester hollow filaments are subjected to secondary processing on a BCF spinning device, specifically: the polyester hollow filaments are sequentially subjected to oil treatment, a first pre-network treatment, a first hot stretching, a deformation treatment, cooling and shaping, a filament separation treatment, and a first main network treatment to obtain polyester hollow deformation yarns. The product specification is 80dtex / 36f. The obtained polyester hollow deformation yarns have excellent high hollowness and resilience, with a single yarn fineness of 2.3dtex, a hollowness of 30%, and a curling rate of 35%.

[0057] Wherein: the oiling rate of the oil treatment is 1.0%, three pairs of drafting rollers are provided in the first hot drafting process to perform hot drafting treatment on the fibers, the temperatures of the three pairs of drafting rollers are all set to 0°, the speed of the first pair of drafting rollers is 2233m / min, the speed of the second pair of drafting rollers is 2255m / min, and the speed of the third pair of drafting rollers is 2270m / min, the pressure of the deformation treatment is 0.7MPa, the temperature of the deformation treatment is 145°C, the pressure of the cooling and shaping is 0.04MPa, and the speed of the cooling drum used for the cooling and shaping is 22r / min. The filament separation treatment includes the first filament separation treatment and the second filament separation treatment, wherein: the speed of the first filament separation roller used for the first filament separation treatment is 2300 m / min, and the speed of the second filament separation roller used for the second filament separation treatment is 2320 m / min. The pressure of the main network treatment is 0.35MPa, and the winding speed of the winding forming is 2300 m / min.

[0058] It can be seen from Examples 1-3 that the polyester hollow textured yarn prepared by the technical solution of the present application has excellent hollowness and curl. The hollowness of the polyester hollow textured yarn is 25% to 35%, and the curl is 20% to 40%.

[0059] Although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation mode may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0060] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present application. They are not intended to limit the scope of protection of the present application. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present application should be included in the scope of protection of the present application.

Claims

1. A method for producing polyester hollow textured yarn, characterized in that: The following steps are involved: S1. preparing polyester hollow filaments by melt spinning, wherein the polyester hollow filaments have the following characteristics: a total line density of 55 to 110 dtex, a single filament line density of 1.5 to 3.1 dtex, and a hollowness of 30% to 40%; S2, subjecting the polyester hollow filaments to secondary processing on a BCF spinning device, specifically: subjecting the polyester hollow filaments to oil treatment, first pre-network treatment, first hot drawing, deformation treatment, cooling and shaping, filament separation treatment, first main network treatment, and winding and forming to obtain polyester hollow deformation filaments; The pressure of the deformation treatment is 0.6-0.8 MPa, the temperature of the deformation treatment is 135-155°C, and the pressure of the cooling and shaping is 0.02-0.05 MPa; The BCF spinning device includes a raw yarn rack, an oiling roller, a first pre-network device, a feeding roller, a first pair of drafting rollers, a second pair of drafting rollers, a third pair of drafting rollers, a deformation and puffing chamber, a cooling drum, a first wire separation roller, a second wire separation roller, a first main network device, and a winding machine. The temperatures of the first pair of drafting rollers, the second pair of drafting rollers, and the third pair of drafting rollers are all set to 0°, and the rotation speeds of the first pair of drafting rollers, the second pair of drafting rollers, and the third pair of drafting rollers are all set to 2000-2500 m / min; the first pair of drafting rollers, the second pair of drafting rollers, and the third pair of drafting rollers are used to achieve the first hot stretching.

2. The method for producing polyester hollow textured yarn according to claim 1, characterized in that: In step S1, the polyester hollow filaments are prepared by the following process: the slices are sequentially conveyed, dried, extruded and melted, filtered, metered, spun, cooled and solidified, oiled, pre-networked, second hot stretching, third hot stretching, main networked, and wound to obtain polyester hollow filaments.

3. The method for producing polyester hollow textured yarn according to claim 2, characterized in that: The extrusion melting temperature is 280-300°C, the spinning temperature is 265-290°C, the cooling and solidification temperature is 20-25°C, the cooling and solidification wind speed is 1.8-2.6 m / sec, the second hot stretching temperature is 80-92°C, the third hot stretching temperature is 125-137°C, the main network processing pressure is 0.2-0.35 MPa, and the winding speed of the winding molding is 3600-4200 m / min.

4. The method for producing polyester hollow textured yarn according to claim 1, characterized in that: In step S2, the oil treatment has an oiling rate of 0.8-1.2%.

5. The method for producing polyester hollow textured yarn according to claim 1, characterized in that: In step S2, the wire separation process includes a first wire separation process and a second wire separation process, wherein: the rotation speed of the first wire separation roller used in the first wire separation process is 2000-2600 m / min, and the rotation speed of the second wire separation roller used in the second wire separation process is 2020-2620 m / min.

6. The method for producing polyester hollow textured yarn according to claim 1, characterized in that: In step S2, the pressure of the main network treatment is 0.3-0.45 MPa, and the winding speed of the winding forming is 2000-2500 m / min.

7. A polyester hollow textured yarn prepared by the production method according to any one of claims 1 to 6, characterized in that: The hollowness of the polyester hollow textured yarn is 25% to 35%, and the curling rate is 20% to 40%.

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