LLDPE special screw for blowing film
By designing a screw specifically for LLDPE blown film production with alternating mixing and shearing sections, the problem of uneven material mixing was solved, resulting in higher product yield.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 宁波金亿精密机械有限公司
- Filing Date
- 2025-09-01
- Publication Date
- 2026-06-30
AI Technical Summary
Existing blown film machines are prone to generating air bubbles when mixing materials, resulting in uneven and insufficient mixing of materials and increasing the product defect rate.
The LLDPE blown film-specific screw, which includes a mixing section and a shearing section, is used. The mixing section consists of four mixing units, each containing a conical screw and mixing blades. The shearing section consists of three shearing units, each containing a straight column screw and pins. The material is fully mixed through the alternating mixing and shearing units.
It improves the uniformity and thoroughness of material mixing, thereby increasing product yield.
Smart Images
Figure CN224426430U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of screws, and in particular to a screw specifically for LLDPE blown film. Background Technology
[0002] A blown film machine heats and melts plastic particles, then blows them into a thin film. The screw is one of the core components of the blown film machine. It has spiral grooves cut on its outer surface and is installed inside the extruder of the blown film machine. The pressure and shearing force generated by the rotation of the screw can fully plasticize and uniformly mix the material, which is then shaped through a mold.
[0003] In existing technologies, the screw used in blown film machines generates a large number of air bubbles inside the material after mixing, resulting in uneven and insufficient mixing of the material and an increased product defect rate. Utility Model Content
[0004] This utility model embodiment provides a special screw for LLDPE blown film, which improves the uniformity and thoroughness of material mixing during the screw's operation, and further improves the product yield.
[0005] To achieve the aforementioned objectives, this application adopts the following technical solution:
[0006] A screw for LLDPE blown film production, characterized in that it includes:
[0007] The mixing section includes at least four mixing parts, each mixing part including a conical screw and mixing blades disposed on the conical screw;
[0008] A shearing section connected to the mixing section, the shearing section including at least three sets of shearing parts, the shearing parts and the mixing section being arranged alternately, the shearing parts including a straight column screw and a plurality of pins disposed on the straight column screw.
[0009] In some alternative embodiments, the first discharge end of one of the mixing sections is connected to the second feed end of one of the shearing sections, and the second discharge end of the shearing section is connected to the first feed end of another of the mixing sections.
[0010] In some alternative embodiments, a screw mounting head is provided on the first feed end of the mixing section.
[0011] In some alternative embodiments, the length of the tapered screw is L1, and the length of the straight screw is L2, where L2 = L1.
[0012] In some alternative embodiments, the diameter of the conical screw gradually increases from the first feed end to the first discharge end.
[0013] In some alternative embodiments, the mixed screw blades are evenly distributed on the tapered screw.
[0014] In some alternative embodiments, the tilt angle of the hybrid spiral blades is α, where 12° < α < 40°.
[0015] In some alternative embodiments, the distance H between the hybrid screw blade and the conical screw is 2 cm. <H<5cm。
[0016] In some alternative embodiments, as the diameter of the conical screw increases, the distance H between the mixing blades and the conical screw gradually decreases.
[0017] In some alternative embodiments, the pins extend outwards, and straight grooves are formed between adjacent pins in the circumferential direction and between adjacent pins in the axial direction.
[0018] The LLDPE blown film screw provided in this application has the following beneficial effects:
[0019] The technical solution adopted in this application uses an LLDPE blown film special screw, which includes a mixing section and a shearing section connected to the mixing section. The mixing section includes at least four mixing parts, each including a conical screw and mixing blades disposed on the conical screw. Through the rotation of the conical screw, the mixing blades stir and mix the material and push the material to move along the axial direction of the conical screw. The shearing section includes at least three shearing parts, which are alternately arranged with the mixing section. The shearing part includes a straight column screw and several pins disposed on the straight column screw. The pins and the straight grooves formed between the pins cut and disperse the material into multiple strands before mixing when the straight column screw rotates. This thorough mixing of the material ensures that the plasticized material is fully mixed. By passing through at least four mixing parts and at least three shearing parts, the material mixing uniformity and thoroughness are improved during the operation of the screw, further improving the product yield. Attached Figure Description
[0020] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:
[0021] Figure 1 This is an overall structural diagram of a screw specifically designed for LLDPE blown film production according to this application;
[0022] Figure 2 This is a partial structural diagram of a screw specifically designed for LLDPE blown film production according to this application;
[0023] Figure 3 This is a structural diagram of the shearing section in a screw specifically designed for LLDPE blown film production according to this application;
[0024] Figure 4 This is a structural diagram of the shearing section in a screw for LLDPE blown film production, as described in this application, from another perspective.
[0025] Figure label:
[0026] 10. Mixing section; 11. Mixing part; 111. First feed end; 112. First discharge end; 113. Screw mounting head; 12. Conical screw; 13. Mixing screw blade;
[0027] 20. Shearing section; 21. Shearing part; 211. Second feed end; 212. Second discharge end; 22. Straight column screw; 23. Pin; 231. Straight groove. Detailed Implementation
[0028] The specific embodiments of this application are described below with reference to the accompanying drawings and examples. Through the content described in this specification, those skilled in the art can clearly and completely understand the technical solution, the technical problem solved, and the resulting technical effects of this application. It is understood that the specific embodiments described herein are only for explaining this application and not for limiting it. Furthermore, for ease of description, only the parts related to this application are shown in the accompanying drawings.
[0029] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings are only for the purpose of assisting those skilled in the art in understanding and reading the contents described in the specification, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size should fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.
[0030] The use of terms such as "first," "second," and "the" does not imply quantity limitation and may indicate singular or plural. The terms "comprising," "including," "having," and any variations thereof used in this application are intended to cover non-exclusive inclusion; for example, processes, methods, systems that include a series of steps or modules.
[0031] The product or equipment is not limited to the listed steps or units, but may also include steps or units not listed, or other steps or units inherent to these processes, methods, products, or equipment. Terms such as “connection,” “linking,” and “coupled” used in this application are not limited to physical or mechanical connections, but may also include direct or indirect electrical connections.
[0032] It should also be noted that the longitudinal section corresponding to the embodiment of this application can be the section corresponding to the front view direction, the transverse section can be the section corresponding to the right view direction, and the horizontal section can be the section corresponding to the top view direction.
[0033] In addition, without conflict, the embodiments in this application and the features in the embodiments may be combined with each other. This application will be described in detail below by referring to the accompanying drawings and in combination with the embodiments.
[0034] Referring to Figure 1 and Figure 2 , Figure 1 is the overall structure diagram of a special screw for LLDPE blown film in this application, Figure 2 is the partial structure diagram of a special screw for LLDPE blown film in this application. As shown in Figure 1 and Figure 2 , a special screw for LLDPE blown film includes a mixing section 10 and a shearing section 20 connected to the mixing section 10. The mixing section 10 includes at least four groups of mixing parts 11, and the shearing section 20 includes at least three groups of shearing parts 21. The mixing parts 11 and the shearing parts 21 are arranged alternately at intervals. Specifically, the first discharge end 112 of one mixing part 11 is connected to the second feed end 211 of one shearing part 21, and the second discharge end 212 of this shearing part 21 is connected to the first feed end 111 of another mixing part 11. In addition, a screw mounting head 113 is provided on the first feed end 111 of the mixing part 11.
[0035] Continuing to refer to Figure 2 , the mixing part 11 includes a conical screw 12 and mixing blades 13 arranged on the conical screw 12. The length of the conical screw 12 is L1, and the diameter of the conical screw 12 gradually increases from the first feed end 111 to the first discharge end 112. The mixing blades 13 are evenly distributed on the conical screw 12. Further, the inclination angle of the mixing blades 13 is α, 12° < α < 40°, and the distance H that the mixing blades 13 protrude from the conical screw 12 is 2 cm < H < 5 cm, and as the diameter of the conical screw 12 increases, the distance H that the mixing blades 13 protrude from the conical screw 12 gradually decreases. Specifically, through the rotation of the conical screw 12, the mixing blades 13 stir and mix the material and push the material to move along the axial direction of the conical screw 12.
[0036] Continuing to refer to Figure 2 , and referring to Figure 3 and Figure 4 , Figure 3 is the structure diagram of the shearing part 21 in a special screw for LLDPE blown film in this application, Figure 4 is the structure diagram of the shearing part 21 in a special screw for LLDPE blown film in this application from another perspective. As shown in Figure 2 , Figure 3 and Figure 4As shown, the shearing section 21 includes a straight column screw 22 and a plurality of pins 23 disposed on the straight column screw 22. The length of the straight column screw 22 is L2, L2=L1. The pins 23 extend outward, and straight grooves 231 are formed between adjacent pins 23 in the circumferential direction and between adjacent pins 23 in the axial direction. Specifically, when the straight column screw 22 rotates, the plurality of pins 23 and the straight grooves 231 formed between the pins 23 cut and disperse the material into multiple strands and then mix them, so as to fully mix the plasticized material.
[0037] Here, the LLDPE blown film screw includes a mixing section 10 and a shearing section 20 connected to the mixing section 10. The mixing section 10 includes at least four mixing units 11, each including a conical screw 12 and mixing blades 13 disposed on the conical screw 12. Through the rotation of the conical screw 12, the mixing blades 13 stir and mix the material and push the material to move along the axial direction of the conical screw 12. The shearing section 20 includes at least three shearing units 21, and the shearing units 21 and the mixing units 11 are arranged alternately. The shearing section 21 includes a straight column screw 22 and a plurality of pins 23 disposed on the straight column screw 22. When the straight column screw 22 rotates, the pins 23 and the straight grooves 231 formed between the pins 23 cut and disperse the material into multiple strands and mix them. The material is fully stirred so that the plasticized material is fully mixed. The material passes through at least four sets of mixing sections 11 and at least three sets of shearing sections 21, which realizes that the uniformity and fullness of material mixing are improved during the operation of the screw, and further improves the yield of the product.
[0038] Although this application has been described and illustrated with reference to specific embodiments thereof, such description and illustration are not limiting of this application. It will be readily understood by those skilled in the art that various changes can be made and equivalent elements can be substituted within embodiments without departing from the true spirit and scope of this application as defined by the appended claims. Illustrations may not be drawn to scale. Differences may exist between the technical representation in this application and actual implementation due to variables in the manufacturing process, etc. Other embodiments of this application may exist that are not specifically described. The description and illustrations should be considered illustrative rather than restrictive. Modifications can be made to adapt particular circumstances, materials, composition, methods, or processes to the objectives, spirit, and scope of this application. All such modifications fall within the scope of the appended claims. While the methods disclosed herein have been described with reference to specific operations performed in a particular order, it should be understood that these operations can be combined, subdivided, or reordered to form equivalent methods without departing from the teachings of this application. Therefore, unless specifically indicated herein, the order and grouping of operations do not limit this application.
Claims
1. A special screw for LLDPE blown film production, characterized in that, include The mixing section (10) includes at least four mixing parts (11), each mixing part (11) including a conical screw (12) and mixing blades (13) disposed on the conical screw (12); A shearing section (20) is connected to the mixing section (10). The shearing section (20) includes at least three sets of shearing parts (21). The shearing parts (21) and the mixing section (11) are arranged alternately. The shearing part (21) includes a straight column screw (22) and a plurality of pins (23) disposed on the straight column screw (22).
2. The LLDPE blown film screw according to claim 1, characterized in that, A first discharge end (112) of one of the mixing sections (11) is connected to a second feed end (211) of one of the shearing sections (21), and the second discharge end (212) of the shearing section (21) is connected to a first feed end (111) of another mixing section (11).
3. The LLDPE blown film screw according to claim 2, characterized in that, A screw mounting head (113) is provided on the first feed end (111) of the mixing section (11).
4. The LLDPE blown film screw according to claim 3, characterized in that, The length of the tapered screw (12) is L1, and the length of the straight screw (22) is L2, where L2 = L1.
5. The LLDPE blown film screw according to claim 4, characterized in that, The diameter of the conical screw (12) gradually increases from the first feed end (111) to the first discharge end (112).
6. The LLDPE blown film screw according to claim 5, characterized in that, The mixed screw blades (13) are evenly distributed on the conical screw (12).
7. The LLDPE blown film screw according to claim 6, characterized in that, The tilt angle of the hybrid spiral blade (13) is α, where 12° < α < 40°.
8. The LLDPE blown film screw according to claim 7, characterized in that, The distance H, 2cm, between the hybrid screw blade (13) and the conical screw (12) is 2cm. <H<5cm。 9. The LLDPE blown film screw according to claim 8, characterized in that, As the diameter of the conical screw (12) increases, the distance H between the hybrid screw blade (13) and the conical screw (12) gradually decreases.
10. The LLDPE blown film screw according to claim 9, characterized in that, The pin (23) extends outward, and a straight groove is formed between adjacent pins (23) in the circumferential direction, and a straight groove (231) is also formed between adjacent pins (23) in the axial direction.