Mixing extrusion process for developing agent production

Abstract

The invention discloses a mixing extrusion process for developing agent production, which comprises the following steps: feeding materials into an extruder, driving the materials to sequentially pass through first to sixth temperature zones through a screw rod, and extruding; the materials are sheared by the screw rod in the fourth to fifth temperature zones; the feeding speed of the materials is controlled, so that the feeding speed is matched with the shearing speed of the screw rod; the temperature zones are independently heated and water-cooled; the head and tail ends of the third temperature zone are exhausted, and the head end of the fifth temperature zone is exhausted. Materials can be uniformly mixed, and the uniformity of a finished product is improved; and screw abrasion caused by supercooling and product quality influence caused by overheating can be prevented, process stability is guaranteed, and materials are prevented from polluting the environment.

Description

Technical Field

[0001] The invention relates to a mixing and extruding process for producing a developer. Background Art

[0002] Developer, also known as toner, is primarily composed of resin, magnetic powder, pigment, charge control agent, and additives. Currently, developer production primarily utilizes a pulverization process, with the following steps: batching → premixing → kneading and extrusion → coarse pulverization → ultrafine pulverization → classification → modification → homogenization → screening → packaging. Kneading and extrusion, as a crucial step in developer formation, play a decisive role in ensuring the uniformity of the developer particle components.

[0003] Finished developer particles typically range from 6 to 20 μm, requiring high particle uniformity and a wide variety of types and components. However, existing developer compounding and extrusion processes often reference or directly adopt those from the injection molding industry, which is not well-suited to the specific characteristics of the developer industry. This results in poor particle uniformity and poor printing performance. Summary of the Invention

[0004] To address the deficiencies of the prior art, the present invention provides a mixing and extrusion process for developer production, wherein material is fed into an extruder, and driven by a screw to sequentially pass through first to sixth temperature zones before being extruded; the screw shears the material in the fourth to fifth temperature zones; and the material feed rate is controlled to match the feed rate with the shear rate of the screw; each temperature zone is independently heated and water-cooled; and exhaust is performed at both ends of the third temperature zone, and exhaust is performed at the beginning of the fifth temperature zone.

[0005] Preferably, exhaust is carried out at both ends of the third temperature zone by an induced draft fan.

[0006] Preferably, filters are provided at the exhaust passages at both ends of the third temperature zone to prevent materials from overflowing from the exhaust passages at both ends of the third temperature zone.

[0007] Preferably, the first end of the fifth temperature zone is exhausted by a vacuum pump.

[0008] Preferably, a valve is provided in the exhaust passage at the head end of the fifth temperature zone to control the exhaust vacuum degree at the head end of the fifth temperature zone; and the exhaust vacuum degree is controlled at -0.06 MPa.

[0009] Preferably, a filter is provided in the exhaust passage at the head end of the fifth temperature zone to prevent the material from overflowing from the exhaust passage at the head end of the fifth temperature zone.

[0010] Preferably, the temperatures of the first to sixth temperature zones are: 70°C, 120°C, 110°C, 110°C, 110°C, 140°C, respectively.

[0011] Preferably, the water cooling flow rate is 1 to 4 m 3 / h, cooling water with a temperature of 15 to 25°C.

[0012] Preferably, the screw speed is controlled at 250-300 r / min.

[0013] Preferably, the material includes: 50 parts by weight of styrene acrylic resin, 45 parts by weight of magnetic powder, 2 parts by weight of polypropylene wax, 1.5 parts by weight of polyethylene wax, and 1.5 parts by weight of charge regulator.

[0014] The advantages and beneficial effects of the present invention are: providing a mixing and extrusion process for developer production, which can ensure uniform mixing of materials and improve the uniformity of finished products; it can also prevent overcooling and wear of the screw and overheating that affect product quality, ensure process stability, and prevent materials from polluting the environment.

[0015] The present invention has the following characteristics: The present invention controls the feeding rate of the material so that the feeding rate matches the shearing rate of the screw, thus ensuring process stability.

[0016] In the present invention, each temperature zone is heated and water-cooled independently of each other; this ensures that the temperature of each temperature zone reaches an optimal state, preventing overcooling from wearing the screw and overheating from affecting product quality.

[0017] The temperature zones of the present invention have different exhaust requirements. The exhaust at both ends of the third temperature zone is performed by an induced draft fan, which can meet the exhaust requirements of material feeding (i.e., before material shearing). The exhaust at the head end of the fifth temperature zone is performed by a vacuum pump, and the exhaust vacuum at the head end of the fifth temperature zone is controlled at -0.06 MPa, which can meet the exhaust requirements of material shearing, ensure uniform material mixing, and improve the uniformity of the finished product.

[0018] The present invention sets filters in the exhaust passages at both ends of the third temperature zone to prevent materials from overflowing from the exhaust passages at both ends of the third temperature zone; and sets filters in the exhaust passages at the beginning of the fifth temperature zone to prevent materials from overflowing from the exhaust passages at the beginning of the fifth temperature zone; this can prevent materials from polluting the environment. DETAILED DESCRIPTION

[0019] The following examples are only used to illustrate the technical solution of the present invention more clearly, and are not intended to limit the scope of protection of the present invention.

[0020] The technical solutions specifically implemented in the present invention are as follows: The present invention provides a mixing and extrusion process for producing a developer, comprising: The material is fed into an extruder, and the material is driven by a screw to sequentially pass through the first to sixth temperature zones and then extruded; specifically, the material comprises: 50 parts by weight of styrene acrylic resin, 45 parts by weight of magnetic powder, 2 parts by weight of polypropylene wax, 1.5 parts by weight of polyethylene wax, and 1.5 parts by weight of a charge regulator; The screw shears the material in the fourth to fifth temperature zones; and the feeding rate of the material is controlled so that the feeding rate matches the shearing rate of the screw; specifically, the screw speed is controlled at 250-300 r / min; Each temperature zone is heated and water-cooled independently; specifically, the water cooling adopts a flow rate of 1 to 4 m 3 / h, cooling water with a temperature of 15-25°C; the temperatures of the first to sixth temperature zones are: 70°C, 120°C, 110°C, 110°C, 110°C, 140°C; The exhaust at both ends of the third temperature zone is exhausted by the induced draft fan; and filters are installed in the exhaust channels at both ends of the third temperature zone to prevent materials from overflowing from the exhaust channels at both ends of the third temperature zone; The head end of the fifth temperature zone is exhausted by a vacuum pump; and a valve is set in the exhaust channel at the head end of the fifth temperature zone to control the exhaust vacuum degree at the head end of the fifth temperature zone; specifically, the exhaust vacuum degree is controlled at -0.06MPa; and a filter is set in the exhaust channel at the head end of the fifth temperature zone to prevent materials from overflowing from the exhaust channel at the head end of the fifth temperature zone.

[0021] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A mixing and extrusion process for producing a developer, characterized in that: The material is fed into the extruder and driven by the screw to pass through the first to sixth temperature zones in sequence before being extruded; the screw shears the material in the fourth to fifth temperature zones; and the material feed rate is controlled to match the feed rate and the shear rate of the screw; each temperature zone is independently heated and water-cooled; and the ends of the third temperature zone are vented, and the beginning of the fifth temperature zone is vented.

2. The mixing and extrusion process for producing a developer according to claim 1, characterized in that: The exhaust is carried out at both ends of the third temperature zone through the induced draft fan.

3. The mixing and extrusion process for producing a developer according to claim 1, characterized in that: Filters are installed at the exhaust channels at both ends of the third temperature zone to prevent materials from overflowing from the exhaust channels at both ends of the third temperature zone.

4. The mixing and extrusion process for producing a developer according to claim 1, characterized in that: The first end of the fifth temperature zone is exhausted by a vacuum pump.

5. The mixing and extrusion process for producing a developer according to claim 1, characterized in that: A valve is provided in the exhaust passage at the head end of the fifth temperature zone to control the exhaust vacuum degree at the head end of the fifth temperature zone; and the exhaust vacuum degree is controlled at -0.06MPa.

6. The mixing and extrusion process for producing a developer according to claim 1, characterized in that: A filter is provided at the exhaust passage at the head end of the fifth temperature zone to prevent materials from overflowing from the exhaust passage at the head end of the fifth temperature zone.

7. The mixing and extrusion process for producing a developer according to claim 1, characterized in that: The temperatures in the first to sixth temperature zones are 70°C, 120°C, 110°C, 110°C, 110°C, and 140°C, respectively.

8. The mixing and extrusion process for producing a developer according to claim 1, characterized in that: The flow rate of water cooling is 1~4m 3 / h, cooling water with a temperature of 15 to 25°C.

9. The mixing and extrusion process for producing a developer according to claim 1, characterized in that: The screw speed is controlled at 250-300r / min.

10. The mixing and extrusion process for producing a developer according to claim 1, characterized in that: The materials include: 50 parts by weight of styrene-acrylic resin, 45 parts by weight of magnetic powder, 2 parts by weight of polypropylene wax, 1.5 parts by weight of polyethylene wax, and 1.5 parts by weight of charge regulator.