Process for preparing composite filament spiral ring and prepared composite filament spiral ring

Abstract

The invention discloses a process for preparing a composite filament spiral ring and the prepared composite filament spiral ring, the process comprises the following steps: a composite monofilament with a skin-core composite structure is sequentially subjected to unwinding, preheating, constant tension control, ring winding, heat setting and cooling, and the heat setting is that the spiral ring is subjected to heating and repeated interval heat setting treatment without heating or cooling; cooling: sequentially carrying out low-temperature cooling and normal-temperature cooling on the spiral ring subjected to heat setting, and carrying out pitch adjustment during normal-temperature cooling, so as to obtain the composite wire spiral ring after the pitch adjustment is completed; the prepared composite filament spiral ring has the following characteristics: at the initial time of 0h, the torsion angle per 2m is lower than 180 degrees; and after standing for 24 hours, the torsion angle is stabilized at 0-90 degrees every 2 meters. The composite filament spiral ring provided by the invention is prepared from the composite monofilament with the skin-core structure, and the production of the double-component composite material spiral ring and spiral net becomes possible through the optimization of the preparation process.

Description

Technical Field

[0001] The invention belongs to the technical field of spiral ring processing, in particular to a process for preparing a composite wire spiral ring and the prepared composite wire spiral ring. Background Art

[0002] Spiral mesh is widely used in papermaking, municipal sewage, food, coal washing and desulfurization industries. Spiral mesh is made by spinning a single wire at high speed through a ring winding device to form spiral rings of different rotation directions (left-handed and right-handed). The structure is similar to a spring. The spiral mesh is spliced ​​by overlapping and meshing two spiral rings of different rotation directions (i.e. networking).

[0003] The spiral ring is the main component of the spiral mesh, and the quality of the monofilament guarantees the performance of the spiral mesh. In the technical field of this industry, PET polyester monofilament is conventionally used as the raw material for the spiral mesh production. However, under the humid and hot and alkaline conditions of the downstream industry, the ester polymer material will be affected by the hydroxyl group and undergo hydrolysis reaction, and the life of the traditional polyester spiral mesh will be greatly reduced. For example, in the municipal sewage treatment industry, quicklime will be added to the sludge as a conditioning agent to reduce the water content of the sewage to meet the sludge factory standards and downstream resource utilization requirements. Therefore, the spiral mesh used for filter pressing will be exposed to alkaline environment for a long time; while the polyester spiral dry mesh of papermaking and food factories is used under humid and hot conditions, and the service life is reduced; in order to make the spiral mesh adapt to the use scenarios with harsh conditions, PA material is applied to the production of monofilaments, which has the advantages of strong wear resistance, alkali resistance and not easy to hydrolyze, but it is easy to deform in a high-temperature environment, resulting in the manufactured spiral mesh failing to achieve the intended use effect. In summary, a spiral mesh made of composite wire that is both strong and alkali-resistant is needed.

[0004] Since the composite wire is a combination of different materials, the dry heat shrinkage properties of their respective materials are inconsistent and difficult to process. Therefore, the spiral ring, which is the most important intermediate transition product in the production process of the spiral mesh, cannot completely eliminate the residual internal stress caused by the difference in dry heat shrinkage and heat penetration efficiency during the processing, making it impossible to form a structurally stable spiral ring state, and the formed ring cannot be formed or is severely distorted.

[0005] In this industry, the standard for qualification is usually to calculate the twisting angle of a 2-meter-long spiral ring in its natural state after folding it in half, and observe its structural stability and internal stress release by rotating it after standing for 24 hours or longer. At present, the domestic composite wire spiral mesh winding process cannot produce stable spiral rings. The rotation angle of the spiral rings produced after being placed for 24 hours is greater than 2000° or even no longer in a spiral state, which cannot meet the production requirements of the subsequent processes. Summary of the invention

[0006] The purpose of the present invention is to provide a process for preparing a composite wire spiral ring and a prepared composite wire spiral ring in view of the problems existing in the prior art. The prepared composite wire spiral ring has strong alkali resistance and good structural stability.

[0007] The purpose of the present invention is to be solved by the following technical solutions:

[0008] A process for preparing a composite wire spiral ring, characterized in that the process steps are unwinding → preheating → constant tension control → ring winding → heat setting → cooling, and the specific steps are:

[0009] A. Unwinding: Unwind the composite monofilament with a core-skin composite structure from the reel and send it to the preheater to enter step B;

[0010] B. Preheating: After the composite monofilament is preheated by the preheater, the surface temperature is not less than 80°C, and the process proceeds to step C;

[0011] C. Constant tension control: Perform constant tension control on the preheated composite monofilament and proceed to step D;

[0012] D. Ring winding: The composite monofilament controlled by constant tension is wound into a spiral ring on the mandrel by a ring winding rotating head, and then proceeds to step E;

[0013] E. Heat setting: The spiral ring is subjected to repeated interval heat setting treatments of heating, not heating or cooling, and then enters step F;

[0014] F. Cooling: The heat-set spiral ring is sequentially cooled at low temperature and room temperature, and the pitch is adjusted during room temperature cooling. After completion, a composite wire spiral ring is obtained.

[0015] The composite monofilament in step A is composed of an inner core made of PET polyester material and an outer skin made of PA nylon material. The thickness of the outer skin is 20% to 30% of the diameter of the composite monofilament, and the inner core is wrapped with the outer skin. The dry heat shrinkage rate of the composite monofilament is 14% to 16%, and the thermal conductivity coefficient is 0.2 to 0.23.

[0016] The composite monofilament in step A is unwound from the wire drum by using a wire unwinder and sent to a preheater capable of providing contact preheating for the composite monofilament, and the surface temperature of the preheater is configured to be 100°C to 120°C.

[0017] The constant tension control in step C can control the processing tension of the composite monofilament to a specific value between 25N and 38N; the rotation speed of the ring-wrapping rotating head in step D is 800r / min to 1000r / min.

[0018] The heat setting area in step E is composed of at least two groups of heating zones and spacing zones, the temperature of the heating zones is 220° C. to 250° C., the spacing zones are non-heating environments or cooling environments, and the heat setting process is not less than 20 seconds.

[0019] During the heat setting process in step E, the surface temperature of the spiral ring passing through the heating zone is not lower than 120° C., and the surface temperature of the spiral ring when leaving the heat setting zone is not higher than 160° C.

[0020] The low temperature cooling in step F provides a low temperature rapid cooling environment not higher than 10° C., and the normal temperature cooling in step F provides a room temperature blowing cooling environment.

[0021] The ring pitch of the composite wire spiral ring in step F is adjusted by two clamping wheels, and the ring pitch is adjusted to 80% to 90% of the diameter of the composite monofilament.

[0022] A composite wire spiral ring is prepared by the above-mentioned process for preparing a composite wire spiral ring. The composite wire spiral ring has the following characteristics: at the initial 0h, the torsion angle per 2 meters is less than 180°; after standing for 24h, the torsion angle per 2 meters is stabilized at 0° to 90°.

[0023] The composite wire spiral ring has the following characteristics: at the initial 0h, the torsion angle per 2 meters is less than 90°; after standing for 24h, the torsion angle per 2 meters changes between 20° and 40°; after standing for 48h, the torsion angle per 2 meters changes between 20° and 60°.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] The composite wire spiral ring provided by the present invention is made of a composite monofilament with a skin-core structure. Through the optimization of the preparation process, the production of a two-component composite material spiral ring and a spiral net of PET polyester material and PA nylon material becomes possible, which greatly improves the stability and alkali resistance of the produced composite wire spiral ring.

[0026] The composite wire spiral ring provided by the present invention is a composite monofilament with a skin-core structure made of PET polyester material and PA nylon material. The PA outer skin can cope with the external alkaline environment, and the PET material as the inner core material provides strong support, so that it maintains a stable structure under tension conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Attached Figure 1 A schematic diagram of the structure of a composite monofilament according to an embodiment of the present invention;

[0028] Attached Figure 2 A process flow chart of preparing a composite wire spiral ring according to an embodiment of the present invention;

[0029] Attached Figure 3 A schematic structural diagram of a left-handed spiral ring and a right-handed spiral ring included in an embodiment of the composite wire spiral ring provided by the present invention.

[0030] Among them: 1—composite monofilament; 11—inner core; 12—outer skin; 2—composite filament spiral ring; 21—left-handed spiral ring; 22—right-handed spiral ring; 23—ring pitch. DETAILED DESCRIPTION

[0031] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0032] like Figure 1 A composite monofilament 1 is shown, and the composite monofilament 1 is a core-skin composite structure. The composite monofilament 1 is composed of an inner core 11 made of PET polyester material and an outer skin 12 made of PA nylon material. The inner core 11 is wrapped with the outer skin 12, and the thickness of the outer skin 12 is 20% to 30% of the diameter of the composite monofilament 1; the dry heat shrinkage rate of the composite monofilament 1 is 14% to 16%, and the thermal conductivity coefficient is 0.2 to 0.23.

[0033] like Figure 2 A process for preparing a composite wire spiral ring is provided, the process using Figure 1 The composite monofilament 1 shown in the figure has the following process steps: unwinding → preheating → constant tension control → ring winding → heat setting → cooling. The specific steps are:

[0034] A. Unwinding: unwinding the composite monofilament 1 of the core-skin composite structure from the reel using a wire unwinder and sending it to a preheater capable of providing contact preheating for the composite monofilament 3, and then proceeding to step B;

[0035] B. Preheating: The surface temperature of the preheater is set at 100°C to 120°C. The surface temperature of the composite monofilament 1 after preheating by the preheater is not less than 80°C, and then the process proceeds to step C.

[0036] C. Constant tension control: Perform constant tension control on the preheated composite monofilament 1. The constant tension control can control the processing tension of the composite monofilament 1 to a specific value between 25N and 38N, and then proceed to step D.

[0037] D. Ring winding: winding the composite monofilament 1 with the set processing tension on the mandrel into a spiral ring by ring winding, the speed of the ring winding rotating head is 800r / min to 1000r / min, and then proceeding to step E;

[0038] E. Heat setting: The spiral ring passes through the first heating zone, the second spacing zone, ... the nth heating zone, and the nth spacing zone in sequence for segmented heat setting for not less than 20 seconds. The temperature of each heating zone is 220° C. to 250° C. Each spacing zone is not heated or is cooled. The surface temperature of the spiral ring passing through the first heating zone is not less than 120° C. In order to reduce the damage to the outer skin 12 material caused by long-term heating, an interval cooling treatment is performed during the heat setting process until the inner core 11 of the composite monofilament 1 is completely heat-set, and then enters step F.

[0039] F. Cooling: The heat-set spiral ring is sent to a segmented cooling zone. The first cooling zone uses compressed air cooling with a temperature not higher than 10° C. for low-temperature rapid cooling. The second cooling zone uses room temperature air cooling to cool down. In the second cooling zone environment, the ring pitch 23 is adjusted. The ring pitch 23 of the composite wire spiral ring 2 is adjusted to 80% to 90% of the diameter of the composite monofilament 1. After completion, the composite wire spiral ring 2 (such as Figure 3 shown).

[0040] like Figure 3 A composite wire spiral ring 2 is shown, and the composite wire spiral ring 2 is made by the above-mentioned process for making a composite wire spiral ring. The prepared composite wire spiral ring 2 has the following characteristics: at the initial 0h, the torsion angle per 2 meters is less than 180°; after standing for 24h, the torsion angle per 2 meters is stabilized at 0° to 90°. Further, the composite wire spiral ring 2 provided by the present application has the following characteristics: at the initial 0h, the torsion angle per 2 meters is less than 90°; after standing for 24h, the torsion angle per 2 meters changes to 20° to 40°; after standing for 48h, the torsion angle per 2 meters changes to 20° to 60°.

[0041] like Figure 3 The composite wire spiral ring 2 shown has a spiral structure similar to a spring, including a left spiral ring 21 rotating to the left and a right spiral ring 22 rotating to the right. The ring pitch 23 between adjacent rings is 0.8 to 0.9 times the diameter of the composite monofilament 1.

[0042] Example

[0043] Based on a process for preparing a composite wire spiral ring and the prepared composite wire spiral ring provided in the present application, the following is an example description.

[0044] In this embodiment, the material is Figure 1 The composite monofilament 1 with a core-sheath structure shown has an inner core 11 made of PET polyester material and an outer sheath 12 made of PA nylon material. The thickness of the PA nylon material wrapped around the inner core 11 is 20% of the total diameter of the composite monofilament 1 .

[0045] In this embodiment, the wire diameter of the composite monofilament 1 is set to 0.7 mm, the thickness of the outer skin 6 made of PA nylon material is 0.14 mm, and the dry heat shrinkage filter of the composite monofilament 1 is 15.2%. Figure 3 The ring pitch 23 of the composite yarn spiral ring 2 is configured to be 0.8 times the diameter of the composite monofilament 3, that is, 0.56 mm. The outer dimensions of the composite yarn spiral ring 2 are a width of 6.8±0.05 mm and a thickness of 3.9±0.05 mm.

[0046] To further illustrate the process of the composite wire spiral ring 2, Figure 2 As shown, the processing technology of the composite wire spiral ring 2 includes: unwinding→preheating→constant tension control→ring winding→heat setting→cooling including pitch adjustment.

[0047] The composite monofilament 1 is processed by a ring winding machine, and the composite monofilament 1 is unwound from the wire drum by a wire unwinder. A preheater is provided downstream of the wire unwinder to provide contact preheating for the composite monofilament 1. The preheater is a copper disk. After the composite monofilament 1 is preheated, a constant tension is pre-applied and the composite monofilament 1 is sent to the ring winding rotating head for ring winding to obtain a spiral ring. When the spiral ring is heat-set, it needs to be repeatedly heat-set for not less than 20 seconds in the first heating zone, the first spacing zone, the second heating zone, and the second spacing zone. The temperature of each heating zone is 220 ℃~250℃, the interval zone is not heated, the surface temperature of the spiral ring after passing through the first heating zone is 153℃, and the surface temperature of the spiral ring 2 after leaving the first interval zone drops to 110℃, and after a group of recirculation, the inner core 11 is completely heat-set, and the heat-set spiral ring is sent to the segmented cooling zone. The first cooling zone uses compressed air with a temperature not higher than 10℃ for low-temperature rapid cooling, and the second cooling zone uses room temperature air cooling to cool down, and the pitch is adjusted in the room temperature air cooling environment of the second cooling zone, and finally the following is obtained Figure 3 The composite wire spiral ring 2 is shown.

[0048] In this embodiment, the processing parameters of the prepared 1#~4# composite wire spiral rings 2 are as follows: the preheating temperature is set at 120°C, the preheating method is contact preheating, and the surface temperature of the composite monofilament 1 after preheating is controlled to be not less than 80°C; after passing through the preheater, the tension of the composite monofilament 1 is constantly set at 35N and then fed to the winding rotating head for winding, the composite monofilament 1 is wound into a spiral ring with a spring-like structure, and the winding speed of the winding rotating head is 800rpm / min; the temperature of the heating zone for heat setting is 220°C~250°C, and the interval zone is not heated. The total residence time of the spiral ring in the heat setting area is not less than 20s, the surface temperature of the spiral ring is controlled at 153°C in the heating zone and 110°C in the interval zone, the compressed air temperature in the first cooling zone is configured to be <10°C, and the air cooling temperature in the second cooling zone is configured to be room temperature.

[0049] In this embodiment, the standard requirements for the prepared 1#~4# composite wire spiral rings 2 are: the torsion angle is controlled to be lower than 90° every 2 meters at the initial 0h; compared with 0h, after the composite wire spiral ring 2 has been stationary for 24h, the torsion angle changes between 20° and 40° every 2 meters; after the composite wire spiral ring 2 has been stationary for 48h, the torsion angle changes between 20° and 60° every 2 meters.

[0050]

[0051] Table 1 Test data

[0052] In this embodiment, the test data of the prepared 1#~4# composite wire spiral rings 2 are shown in Table 1. The torsion angle test data of the composite wire spiral ring 2 based on PA / PET is maintained at 0°~60° within 48 hours. The standard width of the composite wire spiral ring 2 prepared based on the composite monofilament 3 with a wire diameter of 0.7mm is 6.8±0.05mm and the standard thickness is 3.9±0.05mm, indicating that the prepared 1#~4# composite wire spiral rings 2 have strong stability and excellent performance.

[0053] The composite wire spiral ring 2 provided by the present invention is made of a composite monofilament 3 with a skin-core structure. Through the optimization of the preparation process, the production of two-component composite material spiral rings and spiral nets of PET polyester material and PA nylon material becomes possible, which greatly improves the stability and alkali resistance of the produced composite wire spiral ring 2.

[0054] The above embodiments are only for illustrating the technical idea of ​​the present invention, and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the present invention; any technology not involved in the present invention can be realized by existing technologies.

Claims

1. A process for preparing a composite wire spiral ring, characterized in that: The process steps are unwinding → preheating → constant tension control → ring winding → heat setting → cooling. The specific steps are: A. Unwinding: unwinding the composite monofilament (1) of the core-skin composite structure from the wire drum and sending it to the preheater to enter step B; B. Preheating: After the composite monofilament (1) is preheated by the preheater, the surface temperature is not less than 80° C., and the process proceeds to step C; C. Constant tension control: performing constant tension control on the preheated composite monofilament (1), and proceeding to step D; D. Ring winding: The composite monofilament (1) with constant tension control is wound into a spiral ring on the mandrel by a ring winding rotating head, and then the process proceeds to step E; E. Heat setting: The spiral ring is subjected to repeated interval heat setting treatments of heating, not heating or cooling, and then enters step F; F. Cooling: After heat setting, the spiral ring is sequentially cooled at low temperature and room temperature and the pitch is adjusted during room temperature cooling. After completion, a composite wire spiral ring (2) is obtained.

2. The process for preparing a composite wire spiral ring according to claim 1, characterized in that: The composite monofilament (1) in step A is composed of an inner core (11) made of a PET polyester material and an outer sheath (12) made of a PA nylon material, the thickness of the outer sheath (12) being 20% ​​to 30% of the diameter of the composite monofilament (1), and the inner core (11) is wrapped with the outer sheath (12); the composite monofilament (1) has a dry heat shrinkage rate of 14% to 16% and a thermal conductivity of 0.2 to 0.

23.

3. The process for preparing a composite wire spiral ring according to claim 1, characterized in that: The composite monofilament (1) in step A is unwound from the wire drum using a wire unwinder and sent to a preheater capable of providing contact preheating for the composite monofilament (1), wherein the surface temperature of the preheater is configured to be between 100° C. and 120° C.

4. The process for preparing a composite wire spiral ring according to claim 1, characterized in that: The constant tension control in step C can control the processing tension of the composite monofilament (1) to a specific value between 25N and 38N; the rotation speed of the ring-winding rotating head in step D is between 800r / min and 1000r / min.

5. The process for preparing a composite wire spiral ring according to claim 1, characterized in that: The heat setting area in step E is composed of at least two groups of heating zones and spacing zones, the temperature of the heating zones is 220° C. to 250° C., the spacing zones are non-heating environments or cooling environments, and the heat setting process is not less than 20 seconds.

6. The process for preparing a composite wire spiral ring according to claim 5, characterized in that: During the heat setting process in step E, the surface temperature of the spiral ring passing through the heating zone is not lower than 120° C., and the surface temperature of the spiral ring when leaving the heat setting zone is not higher than 160° C.

7. The process for preparing a composite wire spiral ring according to claim 1, characterized in that: The low temperature cooling in step F provides a low temperature cooling environment not higher than 10° C., and the normal temperature cooling in step F provides a room temperature air blowing cooling environment.

8. The process for preparing a composite wire spiral ring according to claim 1, characterized in that: The ring pitch (23) of the composite filament spiral ring in step F is adjusted to 80% to 90% of the composite monofilament diameter.

9. A composite wire spiral ring, the composite wire spiral ring (2) being prepared by the process for preparing a composite wire spiral ring as claimed in any one of claims 1 to 8, the composite wire spiral ring (2) having the following characteristics: at the initial 0h, the torsion angle per 2 meters is less than 180°; after standing for 24h, the torsion angle per 2 meters is stabilized at 0°~90°.

10. The composite wire spiral ring according to claim 9, characterized in that: The composite wire spiral ring (2) has the following characteristics: at the initial 0h, the torsion angle per 2 meters is less than 90°; after standing for 24h, the torsion angle per 2 meters changes between 20° and 40°; after standing for 48h, the torsion angle per 2 meters changes between 20° and 60°.

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