A hot rolling process for nonwoven fabric

Abstract

The present application relates to the technical field of non-woven fabric processing, in particular to a hot rolling process for non-woven fabric processing, comprising the following specific steps: S1, screening raw materials; S2, cleaning raw materials; S3, metering and feeding; S4, mixing hot melting; S5, extruding into filaments; S6, air cooling; S7, air flow stretching; S8, carding; S9, overlapping and webbing; S10, hot rolling and bonding. In the present application, the hot rolling roller is divided into multiple hot oil cavities, and the lengths of the multiple oil inlet pipes are set to be the same, so that the time for hot oil to enter the multiple hot oil cavities is approximately the same, thereby achieving uniform heating of each position of the hot pressing roller, and the hot pressing roller drives the rotating shaft to rotate during rotation, i.e. drives the stirring blades to rotate, thereby mixing and stirring the hot oil in the hot oil cavities, ensuring that the temperatures at each position on the hot pressing roller are consistent, and improving the hot rolling effect.

Description

Technical Field

[0001] This invention relates to the field of nonwoven fabric processing technology, and in particular to a hot rolling process for nonwoven fabric processing. Background Technology

[0002] Non-woven fabric, also known as non-woven cloth, is made of oriented or random fibers. It is a new generation of environmentally friendly material with the characteristics of moisture resistance, breathability, flexibility, light weight, non-combustibility, easy decomposition, non-toxicity and non-irritation, rich colors, low price, and recyclability. Most non-woven fabrics are made of polypropylene, while plastic bags are made of polyethylene.

[0003] When processing nonwoven fabrics, they need to be hot-pressed. The hot pressing roller is heated by heated oil. If the hot pressing roller is too long, the hot pressing oil will flow from one end of the roller to the other end. As the roller continuously absorbs heat, the temperature of different positions on the hot pressing roller may vary, which may easily lead to uneven heating. Summary of the Invention

[0004] The purpose of this invention is to address the technical problems existing in the background art, and this invention proposes a hot rolling process for nonwoven fabric processing.

[0005] The technical solution of the present invention: a hot rolling process for processing nonwoven fabrics, comprising the following specific steps;

[0006] S1. Screen raw materials, remove unqualified raw materials, and screen out impurities mixed in the raw materials;

[0007] S2. Raw material cleaning: Put the raw materials into the cleaning tank and stir them. At the same time, pour clean water into the cleaning tank. After the raw materials are cleaned, dry them.

[0008] S3. Metered feeding: Weighing various raw materials according to proportions;

[0009] S4. Mixing and melting: The raw materials are put into the heating box and melted in the heating box. During the melting process, the raw materials are mixed and stirred.

[0010] S5. Extrusion into filaments: The melted raw material is extruded into filaments.

[0011] S6. Air cooling: The extruded fibers are air-cooled.

[0012] S7. Airflow stretching: The obtained fibers are stretched by airflow to form fiber filaments;

[0013] S8. Combing: The fiber filaments are folded horizontally and vertically to form a single web;

[0014] S9. Overlapping to form a web: Stack multiple single webs to form a multi-layered fiber web with 2-6 layers of interlaced fibers;

[0015] S10, Hot rolling bonding, placing the multi-layer fiber web between two hot press rollers at the upper and lower ends, so that the multi-layer fiber web is sandwiched between the two hot press rollers. During this process, the temperature and pressure required by the process are adjusted. The heat source of the hot press rollers is supplied by the input hot oil.

[0016] Preferably, the hot press roller has a hollow structure, and a rotating tube extending through both ends of the hot press roller is provided on the hot press roller. Multiple dividing rings are equidistantly arranged between the inner wall of the hot press roller and the outer wall of the rotating tube, dividing the inner side of the hot press roller into multiple hot oil chambers. Buffer housings A and B are respectively provided on both sides of the rotating tube. The outer ends of buffer housings A and B are connected to outer end pipes A and B, respectively. Rotary joints A and B are respectively installed on outer end pipes A and B. Multiple oil inlet pipes are connected to buffer housing A. Multiple oil inlet pipes are connected to the interior of multiple hot oil chambers. Multiple return pipes are connected to the buffer housing B and are located inside the multiple hot oil chambers. Multiple rotating shafts are mounted on the rotating pipe in a radial direction. Stirring blades are fixed on the rotating shafts and are located in the hot oil chambers. A bevel gear B is fixed at the end of the rotating shaft. A fixed shaft is set at the center of the rotating pipe. Multiple bevel gears A are set on the fixed shaft and mesh with multiple bevel gears B. One end of the fixed shaft is located outside the rotating pipe and is connected to a fixed bracket.

[0017] Preferably, all the oil inlet pipes are of the same length.

[0018] Preferably, a ball bearing is installed on the end of the fixed shaft away from the fixed frame, and the ball bearing is fixedly installed on the inner wall of the rotating tube.

[0019] Preferably, the drying temperature is 100–180℃.

[0020] Preferably, the pressure of the hot rolling roll is 1500-3500 kPa, and the temperature of the hot rolling roll is 120-200°C.

[0021] Preferably, the raw material for processing is one or a mixture of polyethylene, polypropylene, and polyester fiber.

[0022] Compared with the prior art, the above-mentioned technical solution of the present invention has the following beneficial technical effects: the heated oil enters the buffer housing A through the rotary joint A, and finally enters the multiple hot oil chambers through multiple oil inlet pipes. Since the length of the multiple oil inlet pipes is the same, the time for the hot oil to enter the multiple hot oil chambers is approximately the same, thereby achieving uniform heating of each position of the hot pressing roller. In addition, the hot pressing roller drives the rotating shaft to rotate during rotation. Since the bevel gear B on the rotating shaft meshes with the bevel gear A, the rotating shaft rotates, which drives the stirring blades to rotate, thereby mixing and stirring the hot oil in the hot oil chamber, ensuring that the temperature of each position on the hot pressing roller is consistent and improving its hot rolling effect. Attached Figure Description

[0023] Figure 1 This is a flowchart of the process of the present invention.

[0024] Figure 2 This is a schematic diagram of the structure of the hot press roller in this invention.

[0025] Figure 3 and Figure 4 All of these are cross-sectional structural diagrams of the hot pressing roller and rotating tube in this invention.

[0026] Figure 5 for Figure 4 A magnified schematic diagram of the structure at point A.

[0027] Reference numerals: 1. Hot press roller; 101. Hot oil chamber; 2. Rotating pipe; 3. Separating ring; 4. Oil inlet pipe; 5. Return pipe; 61. Buffer housing A; 62. Buffer housing B; 71. Outer end pipe A; 72. Outer end pipe B; 81. Rotary joint A; 82. Rotary joint B; 9. Fixed shaft; 10. Rotating shaft; 11. Stirring blade; 121. Bevel gear A; 122. Bevel gear B; 13. Ball bearing; 14. Fixed frame. Detailed Implementation

[0028] like Figure 1-5 As shown, the hot rolling process for nonwoven fabric processing proposed in this invention includes the following specific steps;

[0029] S1. Screening raw materials: Remove unqualified raw materials and screen out impurities mixed in the raw materials. The raw materials are one or more of polyethylene, polypropylene, and polyester fiber.

[0030] S2. Raw material cleaning: Put the raw materials into the cleaning tank and stir them. At the same time, pour clean water into the cleaning tank. After the raw materials are cleaned, dry them at a temperature of 100-180℃.

[0031] S3. Metered feeding: Weighing various raw materials according to proportions;

[0032] S4. Mixing and melting: The raw materials are put into the heating box and melted in the heating box. During the melting process, the raw materials are mixed and stirred.

[0033] S5. Extrusion spinning: The melted raw material is extruded into filaments;

[0034] S6. Air cooling: The extruded fibers are air-cooled.

[0035] S7. Airflow stretching: The obtained fibers are stretched by airflow to form fiber filaments;

[0036] S8. Combing: The fiber filaments are folded horizontally and vertically to form a single web;

[0037] S9. Overlapping to form a web: Stack multiple single webs to form a multi-layered fiber web with 2-6 layers of interlaced fibers;

[0038] S10. Hot rolling bonding: The multi-layer fiber web is placed between two hot press rollers 1 at the upper and lower ends, so that the multi-layer fiber web is sandwiched between the two hot press rollers 1. During this process, the temperature and pressure required by the process are adjusted. The heat source of the hot press roller 1 is supplied by the input hot oil. The pressure of the hot press roller is 1500~3500KPa, and the temperature of the hot press roller is 120~200℃.

[0039] The hot press roller 1 has a hollow structure. A rotating tube 2 extends through both ends of the hot press roller 1. Multiple dividing rings 3 are equidistantly arranged between the inner wall of the hot press roller 1 and the outer wall of the rotating tube 2, dividing the inner side of the hot press roller 1 into multiple hot oil chambers 101. Buffer housings A61 and B62 are respectively arranged on both sides of the rotating tube 2. The outer ends of buffer housings A61 and B62 are connected to outer end pipes A71 and B72, respectively. Rotary joints A81 and B82 are respectively installed on outer end pipes A71 and B72. Multiple oil inlet pipes 4 are connected to the buffer housing A61. All oil inlet pipes 4 are of the same length and are connected to the interior of the multiple hot oil chambers 101. The buffer housing B62 is connected to multiple return pipes 5, which are respectively located inside multiple hot oil chambers 101. Multiple rotating shafts 10 are rotatably mounted on the rotating pipe 2 along its radial direction. Stirring blades 11 are fixed on the rotating shafts 10 and are located in the hot oil chambers 101. A bevel gear B122 is fixed at the end of the rotating shaft 10. A fixed shaft 9 is set at the center of the rotating pipe 2. Multiple bevel gears A121 are set on the fixed shaft 9 and mesh with multiple bevel gears B122 respectively. One end of the fixed shaft 9 is located on the outside of the rotating pipe 2 and is connected to a fixing frame 14. A ball bearing 13 is installed on the end of the fixed shaft 9 away from the fixing frame 14 and is fixedly installed on the inner wall of the rotating pipe 2.

[0040] The working principle of this invention is as follows: heated oil enters the buffer housing A61 through the rotary joint A81, and finally enters the multiple hot oil chambers 101 through multiple oil inlet pipes 4. Since the lengths of the multiple oil inlet pipes 4 are the same, the time for the hot oil to enter the multiple hot oil chambers 101 is approximately the same, thereby achieving uniform heating of each position of the hot pressing roller 1. During the rotation of the hot pressing roller 1, the rotating shaft 10 is driven to rotate. Since the bevel gear B122 on the rotating shaft 10 meshes with the bevel gear A121, the rotating shaft 10 rotates, which drives the stirring blades 11 to rotate, thereby mixing and stirring the hot oil in the hot oil chambers 101, ensuring that the temperature of each position on the hot pressing roller 1 is consistent and improving its hot rolling effect.

[0041] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A pressure roller for nonwoven fabric processing, characterized in that, The device includes a hot press roller (1), which has a hollow structure. A rotating tube (2) is provided on the hot press roller (1) and extends through both ends of it. Multiple dividing rings (3) are provided at equal intervals between the inner wall of the hot press roller (1) and the outer wall of the rotating tube (2). The multiple dividing rings (3) divide the inner side of the hot press roller (1) into multiple hot oil chambers (101). Buffer housings A (61) and B (62) are provided on both sides of the rotating tube (2). The outer ends of buffer housings A (61) and B (62) are connected to outer end pipes A (71) and B (72). Rotary joints A (81) and B (82) are installed on outer end pipes A (71) and B (72) respectively. Multiple oil inlet pipes (4) are connected to buffer housing A (61). The lengths of the multiple oil inlet pipes (4) are all the same. The multiple oil inlet pipes (4) are connected to the multiple hot oil chambers (101) respectively. The internal connection is such that multiple return pipes (5) are connected to the buffer shell B (62), and the multiple return pipes (5) are respectively located inside the multiple hot oil chambers (101). Multiple rotating shafts (10) are installed on the rotating tube (2) along its radial direction. Stirring blades (11) are fixed on the rotating shafts (10). The stirring blades (11) are located in the hot oil chambers (101). A bevel gear B (122) is fixed at the end of the rotating shaft (10). A fixed shaft (9) is set at the center of the rotating tube (2). Multiple bevel gears A (121) are set on the fixed shaft (9). The multiple bevel gears A (121) mesh with the multiple bevel gears B (122) respectively. One end of the fixed shaft (9) is located outside the rotating tube (2) and is connected to a fixed frame (14). A ball bearing (13) is installed on the end of the fixed shaft (9) away from the fixed frame (14). The ball bearing (13) is fixedly installed on the inner wall of the rotating tube (2).

2. A hot rolling process for nonwoven fabric processing, employing the pressure roller for nonwoven fabric processing as described in claim 1, characterized in that, The specific steps include the following: S1. Screen raw materials, remove unqualified raw materials, and screen out impurities mixed in the raw materials; S2. Raw material cleaning: Put the raw materials into the cleaning tank and stir them. At the same time, pour clean water into the cleaning tank. After the raw materials are cleaned, dry them. S3. Metered feeding: Weighing various raw materials according to proportions; S4. Mixing and melting: The raw materials are put into the heating box and melted in the heating box. During the melting process, the raw materials are mixed and stirred. S5. Extrusion spinning: The melted raw material is extruded into filaments; S6. Air cooling: The extruded fibers are air-cooled. S7. Airflow stretching: The obtained fibers are stretched by airflow to form fiber filaments; S8. Combing: The fiber filaments are folded horizontally and vertically to form a single web; S9. Overlapping to form a web: Stack multiple single webs to form a multi-layered fiber web with 2-6 layers of interlaced fibers; S10, hot rolling bonding, placing the multi-layer fiber web between two hot press rollers (1) at the upper and lower ends, and making the multi-layer fiber web sandwiched between the two hot press rollers (1). During this process, the temperature and pressure required for the process are adjusted, wherein the heat source of the hot press rollers (1) is supplied by the input hot oil.

3. The hot rolling process for nonwoven fabric processing according to claim 2, characterized in that, The drying temperature is 100–180°C.

4. The hot rolling process for nonwoven fabric processing according to claim 2, characterized in that, The pressure of the hot rolling roll is 1500-3500 kPa, and the temperature of the hot rolling roll is 120-200°C.

5. The hot rolling process for nonwoven fabric processing according to claim 2, characterized in that, The raw materials for processing are one or more of polyethylene, polypropylene, and polyester fiber.

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