Mouth mold for double-screw extruder
By designing a specific area layout and structure on the twin-screw extruder die, the problem of uneven melt pressure was solved, and the stability of the melt strip and the improvement of product quality were achieved.
Patent Information
- Application Number
- CN202422082316.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-26
- Publication Date
- 2025-10-21
- Estimated Expiration
- 2034-08-26
AI Technical Summary
In existing twin-screw extruders, the melt pressure is uneven when the polymer melt is extruded from each discharge hole of the die, resulting in unstable strips and affecting production quality.
A die for a twin-screw extruder is designed. The first, second and third regions are provided in the length direction of the die body. The discharge holes are arranged at equal intervals in the length direction of the die body. The diameter of the discharge holes in the second region gradually increases and the depth gradually decreases. The diameters and depths of the discharge holes in the first and third regions are large on both sides and small in the middle. Through reasonable layout and structural design, the melt pressure is made uniform.
This ensures that the melt pressure is relatively uniform when the polymer melt is extruded from each discharge hole, ensures the stability of the melt strips, and improves product quality.
Smart Images
Figure CN223456443U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to double screw extruder die technology field especially is a kind of die for double screw extruder. BACKGROUND
[0002] Double screw extruder is widely used production equipment, it mainly includes extruder host, screw, die head, die etc. Constituent component, in practical application, reach die head position by the rotation of screw and push, polymer melt generates suitable pressure, then extrudes through the discharge hole on die, again through the drawing, over water, cooling granulation, i.e. obtain plastic granule product. In the related art, the discharge hole on die is uniformly arranged, the depth of each discharge hole is the same, and the discharge hole in the middle position of the die corresponds to the position between the two screws, and when the double screws extrude polymer melt, the amount of polymer melt extruded between the two screws is greater than the amount of polymer melt on the side of the screw, which causes the polymer melt to be extruded from each discharge hole of the die to be subjected to melt pressure that is not very uniform, which can make the polymer melt unstable, affecting the production quality. SUMMARY
[0003] The utility model discloses the purpose is: make the melt pressure that polymer melt is subjected to when extruding from each discharge hole of die be more uniform, to ensure that polymer melt is stable.
[0004] In order to achieve the above purpose, the utility model provides a kind of die for double screw extruder, including die body, in the length direction of the die body, the die body has first area, second area and third area, the second area is located in the two sides of the first area, the third area is located in the side of the second area away from the first area, the first area, the second area and the third area are equipped with discharge hole, the axis direction of the discharge hole is parallel to the thickness direction of the die body, all the discharge holes are equidistantly arranged along the length direction of the die body;
[0005] Wherein, in the second area, the discharge hole is equipped with multiple, in the direction of the first area to the third area, the diameter of multiple discharge holes gradually increases, and the depth gradually reduces;The diameter of the discharge hole in the first area is not greater than the minimum diameter of the discharge hole in the second area, the depth of the discharge hole in the first area is greater than the maximum depth of the discharge hole in the second area, the diameter of the discharge hole in the third area is not less than the maximum diameter of the discharge hole in the second area, and the depth of the discharge hole in the third area is less than the minimum depth of the discharge hole in the second area.
[0006] In one specific embodiment of the utility model, 2-3 of the discharge holes are arranged in the first area, 3-5 of the discharge holes are arranged in the second area, and 1-5 of the discharge holes are arranged in the third area.
[0007] In one specific embodiment of the utility model, the absolute value of the difference between the diameter of the first discharge hole in the second area and the diameter of the discharge hole in the first area is D1 mm, the absolute value of the difference between the diameter of the last discharge hole and the diameter of the first discharge hole in the third area is D2 mm, 0≤D1≤0.07, and 0≤D2≤0.07.
[0008] In one specific embodiment of the utility model, the absolute value of the difference between the diameters of two adjacent discharge holes in the second area is D3 mm, 0.03≤D3≤0.17.
[0009] In one specific embodiment of the utility model, the absolute value of the difference between the depth of the first discharge hole and the depth of the next adjacent discharge hole in the second area is H1 mm, the absolute value of the difference between the depth of the discharge hole in the first area and the depth of the first discharge hole in the second area is H2 mm, the absolute value of the difference between the depth of the last discharge hole and the depth of the last adjacent discharge hole is H3 mm, and the absolute value of the difference between the depth of the last discharge hole and the depth of the first discharge hole in the third area is H4 mm, 1.9≤H1≤2.1, 0.9≤H2≤1.1, 2.9≤H3≤3.1, and 3.9≤H4≤4.1.
[0010] In one specific embodiment of the utility model, a groove is arranged at the bottom of the mold body in the thickness direction of the mold body, and each discharge hole is in communication with the groove.
[0011] In one specific embodiment of the utility model, the groove bottom surface is provided with a plurality of conical holes, and the plurality of discharge holes and the smaller ends of the plurality of conical holes are in one-to-one communication.
[0012] In one specific embodiment of the utility model, the conical angle α of the conical hole is 28°-32°.
[0013] In one specific embodiment of the utility model, the surface of the mold body away from the groove is an arc surface in the thickness direction of the mold body.
[0014] In a specific embodiment of the utility model, the die body is further provided with mounting holes, the axis direction of the mounting holes is the thickness direction of the die body, the mounting holes are provided with multiple mounting holes, the multiple mounting holes are arranged in a column along the length direction of the die body, and at least one column of mounting holes is arranged on both sides of the discharge hole in the width direction of the die body.
[0015] Compared with the prior art, the utility model discloses a die head for a double screw extruder, which has the beneficial effects that:
[0016] The die head for a double screw extruder has the characteristics that the diameter of the discharge hole is large on both sides and small in the middle in the length direction of the die body, and the depth is small on both sides and large in the middle, and the diameter of the discharge hole is small and the depth is large to increase the pressure loss, and the diameter of the discharge hole is large and the depth is small to reduce the pressure loss, so that the die head is applied to the double screw extruder, the polymer melt is uniformly subjected to the melt pressure when being extruded from the discharge holes of the die head, the polymer melt is stably discharged, and the product quality is good. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 It is the sectional view of the die head for a double screw extruder of the utility model embodiment.
[0018] Figure 2 It is the structural diagram of the die head for a double screw extruder of the utility model embodiment.
[0019] In the drawing, 1, die body;100, first area;200, second area;300, third area;11, discharge hole;12, groove;13, conical hole;14, arc surface;15, mounting hole. DETAILED DESCRIPTION
[0020] The specific embodiments of the utility model will be further described in detail in combination with the drawings and embodiments. The following embodiments are used to illustrate the utility model, but not to limit the scope of the utility model.
[0021] As Figures 1-2The utility model discloses a die body 1 is provided with first area 100, second area 200 and third area 300 in the length direction, and the second area 200 is located the both sides of first area 100, and the third area 300 is located the side of second area 200 away from first area 100, and first area 100, second area 200 and third area 300 are all equipped with discharge hole 11, and the axis direction of discharge hole 11 is parallel to the thickness direction of die body 1, and all discharge hole 11 is equidistantly arranged along the length direction of die body 1, wherein, in second area 200, discharge hole 11 is equipped with multiple, and along the direction of first area 100 to third area 300, the diameter of multiple discharge hole 11 gradually increases, and the depth gradually reduces, and the diameter of discharge hole 11 in first area 100 is not more than the minimum diameter of discharge hole 11 in second area 200, and the depth of discharge hole 11 in first area 100 is greater than the maximum depth of discharge hole 11 in second area 200, and the diameter of discharge hole 11 in third area 300 is not less than the maximum diameter of discharge hole 11 in second area 200, and the depth of discharge hole 11 in third area 300 is less than the minimum depth of discharge hole 11 in second area 200.
[0022] In practical application, one side of die body 1 provided with the following recess 12 is attached with double screw extruder, and is fixed on double screw extruder through bolt passing through the following mounting hole 15, at this time, first area 100 corresponds the position between two screws, two second areas 200 correspond two screws respectively, and third area 300 corresponds the side of screw away from another screw, specifically, based on the above structure of die, in the length direction of die body 1, the diameter of discharge hole 11 presents the characteristics of big on both sides and small in the middle, and the depth presents the characteristics of small on both sides and big in the middle, and since the diameter of discharge hole 11 is small and the depth is big, the pressure loss is increased, and the diameter of discharge hole 11 is big and the depth is small, the pressure loss is reduced, therefore, based on the above characteristics, the die is applied in double screw extruder, can make the melt pressure of polymer melt more uniform when extruding from each discharge hole 11 of die, guarantees the stability of polymer melt out strip, and the product quality is good.
[0023] Further, discharge hole 11 in first area 100 is equipped with 2-3, preferably two, discharge hole 11 in second area 200 is equipped with 3-5, preferably three, and discharge hole 11 in third area 300 is equipped with 1-5, preferably one, and in first area 100, the diameter and depth of discharge hole 11 are same, under this structure, can make the melt pressure of polymer melt more uniform when extruding from die.
[0024] The absolute value of the difference between the diameter of the first discharge hole 11 in the second region 200 and the diameter of the discharge hole 11 in the first region 100 is D1 mm, and the absolute value of the difference between the diameter of the last discharge hole 11 in the second region 200 and the diameter of the first discharge hole 11 in the third region 300 is D2 mm, 0≤D1≤0.07, 0≤D2≤0.07, both D1 and D2 meet the above range, which can ensure that the melt pressure of the polymer melt extruded between the second region 200 and the first region 100 and between the second region 200 and the third region 300 is relatively uniform; preferably, D1=0, D2=0.
[0025] Further, in the second region 200, the absolute value of the diameter difference between two adjacent discharge holes 11 is D3 mm, 0.03≤D3≤0.17, the diameter difference between the two will not be too large, and the melt pressure of the polymer melt when extruded through the two adjacent discharge holes 11 is relatively uniform; preferably, D3=0.1.
[0026] Further, in the direction from the first region 100 to the third region 300, the absolute value of the depth difference between the first discharge hole 11 and the next adjacent discharge hole 11 in the second region 200 is H1 mm, the absolute value of the depth difference between the discharge hole 11 in the first region 100 is H2 mm, the absolute value of the depth difference between the last discharge hole 11 and the last adjacent discharge hole 11 is H3 mm, and the absolute value of the depth difference between the first discharge hole 11 in the third region 300 is H4 mm, 1.9≤H1≤2.1, 0.9≤H2≤1.1, 2.9≤H3≤3.1, 3.9≤H4≤4.1, under this depth gradient, the melt pressure of the polymer melt extruded between the second region 200 and the first region 100, between the second region 200 and the third region 300, and in the second region 200 is relatively uniform; preferably, H1=2, H2=1, H3=3, H4=4.
[0027] The diameter of the discharge hole 11 in the first region 100 is D4 mm, and the depth is H5 mm, 5.93≤D4≤6.07, 14.8≤H5≤15.0, preferably, the diameter of the discharge hole 11 in the first region 100 is 6 mm, and the depth is 14.9 mm, as shown in Figure 1 The diameter distribution of the discharge hole 11 at different positions is shown in Table 1, and the depth of the discharge hole 11 at different positions is shown in Table 2.
[0028] Table 1: Diameter distribution of discharge holes at different positions
[0029]
[0030] Table 2: Depth distribution of discharge holes at different positions
[0031]
[0032] Based on the above size, the die structure is reasonable and simple, and when the polymer melt is extruded from each discharge hole 11 of the die, the melt pressure is more uniform, and the polymer melt is stably extruded.
[0033] Further, in the thickness direction of the die body 1, the bottom of the die body 1 is provided with a groove 12, each discharge hole 11 is communicated with the groove 12, and the setting of the groove 12 prolongs the distance between the input end of the discharge hole 11 and the screw, which plays a transition buffering role and is beneficial to the stable extrusion of the polymer melt.
[0034] Further, the groove 12 is provided with a plurality of conical holes 13, and the smaller ends of the plurality of discharge holes 11 and the plurality of conical holes 13 are communicated one by one, and the setting of the conical hole 13 can smoothly convey the polymer melt from the groove 12 to the discharge hole 11, which can further ensure the stable extrusion of the polymer melt.
[0035] Specifically, the conical angle α of the conical hole 13 is 28°-32°, and in this angle range, the stable extrusion effect of the polymer melt is better. Preferably, α=30°.
[0036] Further, in the thickness direction of the die body 1, the side of the die body 1 away from the groove 12 is an arc surface 14, and the output end of the discharge hole 11 is located on the arc surface 14. Specifically, the setting of the arc surface 14 can make the side of the die body 1 provided with the output end of the discharge hole 11 more smooth, and the die has the characteristics of simple structure.
[0037] Further, the die body 1 is also provided with mounting holes 15, the axis direction of the mounting hole 15 is the thickness direction of the die body 1, the mounting hole 15 is provided with a plurality of mounting holes 15, the plurality of mounting holes 15 are arranged in a row along the length direction of the die body 1, and in the width direction of the die body 1, at least one row of mounting holes 15 is arranged on both sides of the discharge hole 11. In actual application, the die is fixedly connected to the double-screw extruder through the mounting hole 15, and the setting of the plurality of mounting holes 15 can ensure that the die is stably connected to the double-screw extruder, and the polymer melt is stably extruded.
[0038] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and substitutions can be made, which should also be considered as the protection scope of the present application.
Claims
1. A die for a twin-screw extruder, characterized by, The mould body (1) has a first region (100), a second region (200) and a third region (300) in the length direction of the mould body (1), the second region (200) is located on both sides of the first region (100), the third region (300) is located on the side of the second region (200) away from the first region (100), the first region (100), the second region (200) and the third region (300) are all provided with discharge holes (11), the axis direction of the discharge hole (11) is parallel to the thickness direction of the mould body (1), and all the discharge holes (11) are arranged at equal intervals in the length direction of the mould body (1). Wherein, in the second region (200), the discharge hole (11) is provided with a plurality of, in the direction from the first region (100) to the third region (300), the diameter of the plurality of discharge holes (11) gradually increases, and the depth gradually decreases; the diameter of the discharge hole (11) in the first region (100) is not greater than the minimum diameter of the discharge hole (11) in the second region (200), the depth of the discharge hole (11) in the first region (100) is greater than the maximum depth of the discharge hole (11) in the second region (200), the diameter of the discharge hole (11) in the third region (300) is not less than the maximum diameter of the discharge hole (11) in the second region (200), and the depth of the discharge hole (11) in the third region (300) is less than the minimum depth of the discharge hole (11) in the second region (200).
2. The die for a twin-screw extruder according to claim 1, characterized by The discharge hole (11) in the first region (100) is provided with 2-3, the discharge hole (11) in the second region (200) is provided with 3-5, the discharge hole (11) in the third region (300) is provided with 1-5, and the diameter and depth of the discharge hole (11) in the first region (100) are the same.
3. The die for a twin-screw extruder according to claim 2, characterized by In the direction from the first region (100) to the third region (300), the absolute value of the difference between the diameter of the first discharge hole (11) in the second region (200) and the diameter of the discharge hole (11) in the first region (100) is D1 mm, the absolute value of the difference between the diameter of the last discharge hole (11) and the diameter of the first discharge hole (11) in the third region (300) is D2 mm, 0≤D1≤0.07, 0≤D2≤0.
07.
4. The die for a twin-screw extruder according to claim 3, characterized by In the second region (200), the absolute value of the diameter difference between the two adjacent discharge holes (11) is D3 mm, 0.03≤D3≤0.
17.
5. The die for a twin-screw extruder according to claim 4, characterized by The absolute value of the depth difference between the first discharge hole (11) and the adjacent next discharge hole (11) in the second area (200) is H1 mm, the absolute value of the depth difference between the discharge holes (11) in the first area (100) is H2 mm, the absolute value of the depth difference between the last discharge hole (11) and the adjacent previous discharge hole (11) is H3 mm, and the absolute value of the depth difference between the first discharge hole (11) and the third area (300) is H4 mm, 1.9≤H1≤2.1, 0.9≤H2≤1.1, 2.9≤H3≤3.1, 3.9≤H4≤4.
1.
6. The die for a twin-screw extruder according to claim 1, characterized by In the thickness direction of the mold body (1), the bottom of the mold body (1) is provided with a groove (12), and each discharge hole (11) is in communication with the groove (12).
7. The die for a twin-screw extruder according to claim 6, characterized by The groove (12) is provided with a plurality of conical holes (13), and the smaller end of each discharge hole (11) is in communication with the conical hole (13).
8. The die for a twin-screw extruder according to claim 7, characterized by The conical angle α of the conical hole (13) is 28°-32°.
9. The die for a twin-screw extruder according to claim 6, characterized by In the thickness direction of the mold body (1), the side of the mold body (1) away from the groove (12) is an arc surface (14).
10. The die for a twin screw extruder according to claim 1, wherein The mold body (1) is also provided with mounting holes (15), the axis direction of the mounting hole (15) is the thickness direction of the mold body (1), the mounting hole (15) is provided with a plurality of mounting holes (15), and the mounting holes (15) are arranged in a row along the length direction of the mold body (1), and at least one row of mounting holes (15) is arranged on both sides of the discharge hole (11) in the width direction of the mold body (1).