Screw rod for producing composite plastic material
By optimizing the convex configuration and pitch ratio of the screw, combined with low-density and high-density mixing elements, the problem of poor mixing effect of existing screws in composite material production is solved, and better material dispersion and avoiding material, meeting the production requirements of composite materials.
Patent Information
- Application Number
- CN202422089288.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-28
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-08-28
AI Technical Summary
Existing screws are difficult to meet the mixing needs of composite plastic materials, especially when the polymer has not yet been completely melted, the mixing effect is poor and problems such as caulking are prone to occur.
A screw for the production of composite plastic materials was designed, including the convex and pitch ratio of a specific configuration, which was divided into a molten plasticized section, a mixing section and a third section. It adopts low-density and high-density mixing elements, combining chip grooves and different convex structures to optimize the material mixing process.
It improves the mixing effect of the polymer when it is not completely melted, avoids the phenomenon of material cutting, enhances the dispersion and mixing uniformity of the material, and meets the production needs of composite materials.
Smart Images
Figure CN223058331U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of screw extruders, and specifically to a screw for the production of composite plastic materials. Background Art
[0002] As a new type of material (such as polypropylene / nano-silica composite material), the application fields of nano-plastics are constantly expanding. In order to achieve plastic nanoization, a blending method is often adopted. As the most widely used blending equipment at present, the twin-screw extruder is suitable for nano-material blending.
[0003] Nano-composite technology refers to the use of inorganic powders as additives to improve the thermal deformation temperature, hardness, toughness, stiffness, injection molding shrinkage and other properties of plastics. The mechanical and other properties of the composite materials obtained after the polymer is filled and modified mainly depend on the shape, particle size, aggregate size, surface characteristics and dispersion degree of the filled particles, etc. With the application of nano-technology in plastic modification technology, the properties of the composite materials filled with nano-particles are superior to those filled with conventional fine particles, and filling nano-particles can also obtain improvements in properties such as surface smoothness and improved barrier properties that cannot be obtained by filling conventional fine particles. The screw of the co-rotating twin-screw extruder is mainly divided into: feeding section, solid conveying section, melting and plasticizing section, and mixing section in the axial direction. In order to achieve specific purposes such as exhaust, an exhaust section can also be added. In the above configuration, the mixing section is a very important part, so the screw configuration design of the mixing section has very important significance, and the conventional mixing section is difficult to meet the use requirements. Summary of the Utility Model
[0004] In order to overcome the deficiencies of the background art, the utility model provides a screw for the production of composite plastic materials, mainly solving the problem that the existing screw cannot meet the mixing requirements.
[0005] The technical solution of the utility model is that the screw for the production of composite plastic materials includes spiral ridges provided on the rod body, and the ridges include
[0006] A melting and plasticizing section, on the front end face of which with the material advancing direction as the reference, there are chip grooves
[0007] A mixing section, arranged behind the melting and plasticizing section, and it includes
[0008] The first section, which is composed of the first ridges divided in the middle;
[0009] The second section, which is composed of the second ridges and the third ridges, the second ridges are of a structure divided in the middle, and the third ridges are of a semi-circular complete spiral structure;
[0010] The third section is composed of the fourth convex ridges that are interrupted in the middle, and the distribution density of the fourth convex ridges is greater than that of the first convex ridges.
[0011] The length ratio of the first section, the second section, and the third section is 1:1:0.8.
[0012] The rod body further includes a feeding section and a check ring, and the feeding section is arranged in front of the check ring.
[0013] The outer diameters of the first section and the third section are equal.
[0014] The inclination angle of the convex ridges of the melting and plasticizing section is 44°.
[0015] The pitch ratio of the third section to the first section is 1:2 to 1:3.
[0016] The beneficial effects of the present utility model are as follows: The present utility model provides a screw rod for the production of composite plastic materials. When the polymer has not been completely melted and has a high viscosity, low-density mixing elements should be mainly used; when the polymer is completely melted and has a very low viscosity, high-density mixing elements should be mainly used to increase the mixing effect. Description of the Drawings
[0017] Figure 1 It is a schematic structural diagram of an embodiment of the present utility model.
[0018] Figure 2 It is Figure 1 An enlarged schematic diagram of part A in
[0019] Figure 3 It is Figure 1 An enlarged schematic diagram of part B in Detailed Embodiment
[0020] The present utility model will be further described below in conjunction with the accompanying drawings: As shown in the figure, a screw for producing composite plastic materials includes a helical convex rib 2 provided on a rod body 1. The convex rib includes a melting and plasticizing section 3. A chip groove 31 is provided on the front end face of the melting and plasticizing section based on the advancing direction of the material. A mixing section 4 is provided behind the melting and plasticizing section. It includes a first section 41 composed of a first convex rib 411 that is interrupted in the middle; a second section 42 composed of a second convex rib 421 and a third convex rib 422. The second convex rib is a structure interrupted in the middle, and the third convex rib is a semi-circular complete helical structure; a third section 43 composed of a fourth convex rib 431 that is interrupted in the middle, and the distribution density of the fourth convex rib is greater than that of the first convex rib. Larger particles of the dispersed phase are further reduced in size under the action of shear and tension, while the size of the dispersed phase particles changes little when the polymer is completely melted. Therefore, when the material enters the first section, the material is not completely melted well at this time, and it cannot be extruded by overly dense screw ribs, otherwise situations such as material jamming may occur. When it reaches the second section, the second convex rib and the third convex rib cooperate to further extrude and mix the material, and then in the third section, the relatively dense fourth convex rib is used for extrusion, and the interrupted convex rib structure is more conducive to feeding.
[0021] In this embodiment, as shown in the figure, the length ratio of the first section, the second section, and the third section is 1:1:0.8. In this size ratio, it can be used better.
[0022] In this embodiment, as shown in the figure, the rod body further includes a feeding section 5 and a check ring 51. The feeding section is provided in front of the check ring. It can play a role in preventing the material from retreating, and it is a multi-section circular ring.
[0023] In this embodiment, as shown in the figure, the outer diameters of the first section and the third section are equal.
[0024] In this embodiment, as shown in the figure, the inclination angle of the convex rib of the melting and plasticizing section is 44°.
[0025] In this embodiment, as shown in the figure, the pitch ratio of the third section to the first section is 1:2 to 1:3. In this size ratio, it can be used better.
[0026] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.
[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality of" means two or more unless otherwise specifically defined.
[0028] The embodiments described with reference to the accompanying drawings are exemplary and are intended to explain the present utility model and should not be construed as limiting the present utility model. The embodiments should not be regarded as limiting the present utility model, but any improvements made based on the spirit of the present utility model should be within the protection scope of the present utility model.
Claims
1. A screw for producing composite plastic materials, comprising spiral ridges (2) provided on a rod body (1), characterized in that: The convex ridges include a melting and plasticizing section (3), on the front end face of which with the material advancing direction as the reference, there is a chip groove (31) a mixing section (4), arranged behind the melting and plasticizing section, which includes a first section (41), composed of a first convex ridge (411) that is divided in the middle; a second section (42), composed of a second convex ridge (421) and a third convex ridge (422), the second convex ridge is a structure divided in the middle, and the third convex ridge is a semi-circular complete spiral structure; a third section (43), composed of a fourth convex ridge (431) that is divided in the middle, and the distribution density of the fourth convex ridge is greater than that of the first convex ridge.
2. The screw for producing the composite plastic material according to claim 1, wherein: The length ratio of the first section, the second section and the third section is 1:1:0.
8.
3. The screw for producing the composite plastic material according to claim 2, characterized in that: The rod body further includes a feeding section (5) and a check ring (51), and the feeding section is arranged in front of the check ring.
4. The screw for producing the composite plastic material according to claim 3, characterized in that: The outer diameters of the first section and the third section are equal.
5. The screw for producing the composite plastic material according to claim 4, characterized in that: The inclination angle of the convex ridge of the melting and plasticizing section is 44°.
6. The screw for producing the composite plastic material according to claim 5, characterized in that: The pitch ratio of the third section to the first section is 1:2 to 1:3.