Mixing part and screw extruder applying same
By designing V-shaped mixing units and shear structures on screw extruders, the problems of slow heat transfer and slow resin plasticization are solved, enabling rapid resin plasticization and improving production efficiency, thus ensuring the quality of BOPP films.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-07
- Publication Date
- 2026-04-03
AI Technical Summary
Existing twin-screw extruders suffer from slow heat transfer, slow resin plasticization, and low processing efficiency in BOPP film production. Furthermore, the mixing of compound parts is inefficient during meshing and mixing, leading to poor BOPP film production.
A mixing component is used, fixed on a screw, comprising multiple mixing units distributed along the screw axis. The mixing units form a V-shaped structure and a shear structure in the circumferential direction. The shear structure has different distances from the two side edges. The resin is subjected to high shear and high compression through the V-shaped structure and the shear structure, thereby improving the heat transfer efficiency.
Through high shear and high compression, the resin temperature rises rapidly to reach the plasticizing temperature, reducing the resin residence time in the extruder, improving production efficiency, avoiding resin aging and equipment blockage, and ensuring the quality of BOPP film.
Smart Images
Figure CN224074954U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of screw extruder technology, specifically to a compound and a screw extruder using the structure. Background Technology
[0002] Currently, twin-screw extruders used in BOPP film production employ electric heaters mounted on the outer surface of the cylinder to apply heat to the resin. This external heating system, which transfers heat to the resin through the inner wall of the cylinder, cannot effectively transfer heat to the BOPP resin due to inherent properties such as particle size, bulk density, and thermal conductivity. This results in slow resin temperature rise, low processing speed and efficiency, incomplete plasticization, and consequently, defective BOPP films.
[0003] Currently, twin-screw extruders used for BOPP film production apply compression and shear to the resin through screw rotation. At the same time, the compound further compresses and shears the resin to improve the plasticization of BOPP resin. However, some existing compounding processes still suffer from problems such as low efficiency, slow plasticization, and slow heat transfer during interlocking compounding. Utility Model Content
[0004] The purpose of this utility model is to solve the above problems by providing a compound and a screw extruder using the structure.
[0005] To achieve the above objectives, this utility model specifically adopts the following technical solution:
[0006] A compound, fixed on a screw, includes a plurality of compounding units distributed along the axial direction of the screw. Each compounding unit has at least one V-shaped structure formed in the circumferential direction, and each compounding unit has protruding and / or recessed shearing structures distributed in the circumferential direction. The shearing structures are spaced at different distances from the two side edges of the compounding unit.
[0007] As a further description of the above technical solution, the multiple mixing units have at least two diameter sizes.
[0008] As a further description of the above technical solution, the included angle of the end of the V-shaped structure ranges from 20° to 35°.
[0009] As a further description of the above technical solution, the included angle at the end of the V-shaped structure is 30°.
[0010] As a further description of the above technical solution, the ratio of the distance between the two edges of the mixing unit is in the range of 1.5-2.5.
[0011] As a further description of the above technical solution, the ratio of the distance between the two edges of the mixing unit is 2.
[0012] As a further description of the above technical solution, the width direction of the V-shaped structure is in the same direction as the axial direction of the mixing unit.
[0013] As a further description of the above technical solution, the cross-section of the shearing structure is either protruding from the surface of the mixing unit or recessed into the surface of the mixing unit.
[0014] A screw extruder includes an extruder body, a screw is disposed inside the extruder body, and a compound as described in any of the above claims is disposed on the screw;
[0015] The screw is connected to an external drive device.
[0016] As a further description of the above technical solution, one end of the extruder body is provided with an extrusion die, and one end of the extrusion die is provided with a film drive roller group.
[0017] The beneficial effects of this utility model are as follows:
[0018] 1. This invention improves the shear force and compression of the resin through a V-shaped compound, allowing the resin temperature to rise rapidly and reach the plasticizing temperature quickly. Simultaneously, it reduces the resin's residence time in the extruder, thus improving production efficiency.
[0019] To more clearly illustrate the structural features and functions of this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the compound provided by this utility model;
[0021] Figure 2 This is a schematic diagram of the compound provided by this utility model;
[0022] Figure 3 This is a schematic diagram of the screw extruder provided by this utility model.
[0023] Reference numerals: 100, mixing component; 110, mixing unit; 120, V-shaped structure; 130, shearing structure; 210, extruder body; 220, screw; 230, drive unit; 240, extrusion die; 250, film drive roller assembly. Detailed Implementation
[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.
[0025] like Figure 1-2 As shown, in one embodiment, a compound is provided, comprising a plurality of compounding units 110 distributed along the axial direction of a screw 220. Each compounding unit 110 has at least one V-shaped structure 120 formed in the circumferential direction, and each compounding unit 110 has protruding and / or recessed shearing structures 130 distributed in the circumferential direction. The shearing structures 130 are spaced at different distances from the two side edges of the compounding unit 110.
[0026] In this embodiment, a mixing unit 100 has four mixing units 110 arranged axially. Each mixing unit 110 forms a V-shaped structure 120 in the circumferential direction. Specifically, the V-shaped structure 120 protrudes from the surface of the mixing unit 110. During the rotation of the mixing unit 100, the resin can be sheared through the V-shaped structure 120. Furthermore, shearing structures 130 distributed circumferentially in each mixing unit 110 can also shear the resin during the rotation of the mixing unit 100. At the same time, each shearing structure 130 has a different distance from the two edges of the mixing unit 110, which can fully plasticize the resin and reduce resin aging.
[0027] In one embodiment, the multiple mixing units 110 have at least two diameter sizes, and the mixing component 100 is composed of multiple mixing units 110. The stepped structure caused by the diameter difference between adjacent mixing units 110 can more fully shear and mix the resin.
[0028] In one embodiment, the included angle ∠a at the end of the V-shaped structure 120 ranges from 20° to 35°, preferably 30°. If the angle is too small, melt fracture may occur during the extrusion process of the BOPP resin, leading to problems such as resin carbonization. If the angle is too large, the BOPP resin may not be fully plasticized during production, resulting in defective products and equipment problems such as clogging of the extrusion die 240.
[0029] In one embodiment, the ratio of the distance between the two edges of the mixing unit 110, i.e., m to n, ranges from 1.5 to 2.5. Preferably, the ratio of the distance between the two edges of the mixing unit 110 is 2. If the ratio is too small, it will cause BOPP resin residue during the extrusion process, leading to the resin remaining in the extruder for too long and causing resin aging. If the ratio is too large, it will cause severe edge damage to the compound 100 during production and increase the processing difficulty of the compound 100.
[0030] In one embodiment, the width direction of the V-shaped structure 120 is in the same direction as the axial direction of the mixing unit 110. Specifically, the sharp corner of the V-shaped structure 120 is in the same direction as the circumference of the mixing unit 110, so that the resin can be fully mixed and sheared through the sharp corner of the V-shaped structure 120 during the rotation of the mixing component 100.
[0031] In one embodiment, the cross-section of the shearing structure 130 is either protruding from or recessed on the surface of the mixing unit 110, and the protruding or recessed shearing structure 130 can fully mix and shear the resin.
[0032] like Figure 3 As shown, in one embodiment, a screw extruder includes an extruder body 210, a screw 220 is disposed inside the extruder body 210, and the aforementioned compound 100 is disposed on the screw 220;
[0033] The screw 220 is connected to an external drive unit 230. The drive unit 230 drives the screw 220 and the mixing component 100 to rotate, thereby shearing and mixing the resin material inside the extruder body 210.
[0034] In one embodiment, an extrusion die 240 is provided at one end of the extruder body 210, and a film drive roller assembly 250 is provided at one end of the extrusion die 240. The mixed resin material is extruded through the extrusion die 240 and then pulled into a film by the film drive roller assembly 250.
[0035] In one embodiment, a heating unit is provided at one end of the extruder body 210, which improves energy transfer efficiency through the combined action of the heating unit and the internal high-shear and high-compression compound 100.
[0036] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A compound, fixed to a screw, characterized in that, include: Multiple mixing units are distributed along the screw axis. Each mixing unit has at least one V-shaped structure in the circumferential direction, and each mixing unit has protruding and / or recessed shearing structures distributed in the circumferential direction. The shearing structures are spaced at different distances from the two sides of the mixing unit.
2. The compound according to claim 1, characterized in that, Multiple mixing units exist in at least two diameter sizes.
3. The compound according to claim 1, characterized in that, The included angle at the end of the V-shaped structure ranges from 20° to 35°.
4. The compound according to claim 3, characterized in that, The included angle at the ends of the V-shaped structure is 30°.
5. The compound according to claim 1, characterized in that, The ratio of the distance between the two edges of the mixing unit is in the range of 1.5-2.
5.
6. The compound according to claim 5, characterized in that, The ratio of the distance between the two edges of the mixing unit is 2.
7. The compound according to claim 1, characterized in that, The width direction of the V-shaped structure is in the same direction as the axial direction of the mixing unit.
8. The compound according to claim 1, characterized in that, The cross-section of the shear structure is either protruding from the surface of the mixing unit or recessed from the surface of the mixing unit.
9. A screw extruder, characterized in that, The extruder body includes a screw inside the extruder body, and the screw is provided with the compound as described in any one of claims 1-8; The screw is connected to an external drive device.
10. The screw extruder according to claim 9, characterized in that, One end of the extruder body is provided with an extrusion die, and one end of the extrusion die is provided with a film drive roller assembly.