A color master batch feeder screw

Abstract

The utility model discloses a color master batch feeding machine screw rod, including screw rod body, the screw rod body is sequentially equipped with feed section, compression section and metering section along the axial direction. The utility model discloses the feed section screw thread groove is wide shallow groove, and the screw thread outer diameter is slightly increased or adopts the gradually changed type to increase the pitch in the feed port area, is favorable to the smooth conveying and dispersion of material. The screw thread groove in -side wall of compression section is periodically provided with staggered convex structure, these structures are discontinuous, inclined or wavy arrangement in the screw pitch direction, can effectively break the material agglomeration, promotes uniform mixing. The screw thread diameter of metering section gradually reduces, and the screw rod body is conical, and the diameter gradually reduces to the discharging place, can realize accurate measurement and extrusion. The utility model can improve the efficiency and uniformity of color master batch feeding, reduce the energy consumption, prolong the service life of equipment.

Description

Technical Field

[0001] This utility model relates to the technical field of auxiliary equipment for plastic extrusion processing, and in particular to a screw for a masterbatch feeder, aiming to solve problems such as material blockage, screw adhesion, and uneven dispersion that easily occur during the conveying process of masterbatch. Background Technology

[0002] Color masterbatches, due to their high concentration of pigments, fillers, or additives, as well as their high-viscosity carrier resins, often exhibit poor flowability and easy adhesion during plastic extrusion. This leads to the following drawbacks in the operation of the feeder screw: Material accumulation and blockage: Pigment particles or high-viscosity resins tend to accumulate in specific areas of the screw (such as the inlet and compression zone), forming clumps that hinder material flow, leading to poor feeding or complete blockage.

[0003] Screw surface adhesion: Under high temperature and shearing, viscous masterbatch can easily form a difficult-to-remove adhesion layer on the screw surface, reducing conveying efficiency, increasing wear between the screw and the barrel, and prolonging the color change and cleaning time.

[0004] Existing screw improvements often focus on a single function (such as adding a shearing section or surface hardening), failing to effectively integrate and solve the aforementioned multiple problems.

[0005] Therefore, a new type of improved screw for masterbatch feeders is needed to solve the problems existing in the background art. Utility Model Content

[0006] Purpose of the utility model: To provide an improved screw for a color masterbatch feeder, which, through a combination of structural optimization and surface treatment, achieves efficient conveying of color masterbatch, effective anti-clogging, and complete anti-adhesion, and endows it with preliminary enhanced dispersion ability, thereby improving feeding efficiency, reducing energy consumption, simplifying maintenance, and improving the quality of the final product.

[0007] To achieve the above objectives, this utility model provides the following technical solution: A screw for a masterbatch feeder includes a screw body, wherein the screw body is provided with a feeding section, a compression section and a metering section sequentially along the axial direction. The feed section has a wide and shallow thread groove, and the outer diameter of the thread is slightly increased in the feed port area or the pitch is gradually increased. The inner wall of the threaded groove of the compression section is periodically provided with staggered protrusions, which are arranged discontinuously, inclined or wavy in the pitch direction. The thread diameter of the metering section gradually decreases, and the screw body of the metering section is tapered, with the diameter gradually decreasing towards the discharge point.

[0008] As a further improvement to the above technical solution: The bottom of the feed section threaded groove is provided with a radially outward vent hole, the diameter of which is 0.1mm to 1mm.

[0009] The threaded sidewalls and / or threaded tops of the metering section employ a microporous structure with embedded self-lubricating material.

[0010] The tilt angle of the protrusion structure ranges from 15° to 60°.

[0011] The ratio of the minimum thread diameter to the maximum thread diameter in the metering section is 1:1.5.

[0012] Compared with the prior art, the beneficial effects of this utility model are: Smooth feeding: The feeding section adopts a wide shallow groove and a slightly increased thread outer diameter or a gradually increased thread pitch design, which increases the feeding space, reduces the feeding resistance, and effectively solves the problem of poor feeding of color masterbatch.

[0013] Uniform compression: The inner wall of the threaded groove of the compression section is provided with an interlaced protrusion structure, which can disperse and mix the masterbatch, prevent agglomeration, and achieve uniform compression.

[0014] High metering accuracy: The metering section adopts a conical structure with a gradually decreasing thread diameter, which can accurately control the amount of masterbatch being conveyed and improve metering accuracy.

[0015] Good venting effect: Venting holes are set at the bottom of the threaded groove of the feed section, which can effectively remove gas from the masterbatch and improve the stability of feeding. Attached Figure Description

[0016] Figure 1 This is a front view structural diagram of the present invention.

[0017] Figure 2 This is a three-dimensional structural diagram of the present invention.

[0018] In the diagram: 1. Feeding section; 2. Compression section; 3. Metering section; 4. Exhaust port; 5. Protruding structure; 6. Microporous structure; 7. Screw body. Detailed Implementation

[0019] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid confusion with the present invention.

[0020] like Figure 1-2As shown, the screw of the masterbatch feeder in this embodiment includes a screw body 7, which is provided with a feeding section 1, a compression section 2, and a metering section 3 along the axial direction, as detailed below: 1. Optimized design of feeding section 1: Increased feed throughput and pretreatment: The threaded groove of feed section 1 is designed as a relatively wide and shallow helical groove, and the outer diameter of the screw is slightly increased in the feed port area (or the pitch is gradually increased) to provide a larger feed space and improve the initial filling rate of the material.

[0021] Venting and Anti-Adhesion Auxiliary: At the bottom of the threaded groove in the feed section 1, tiny, radially outward vent holes 4 are evenly distributed to release trace amounts of gas or volatiles in the material, reducing cavitation formation. Simultaneously, a low-friction coefficient nano-coating can be applied to the bottom of the groove to initially reduce contact friction between the material and the screw.

[0022] 2. Enhanced dispersion and anti-clogging design of compression section 2: Multi-stage progressive shearing and mixing: The depth of the threaded groove in compression section 2 gradually decreases along the axial direction, but the cross-sectional shape of the groove is optimized. Specifically, in the middle and rear part of compression section 2, the inner wall (axial side) of the threaded groove is periodically provided with staggered protrusions 5. These protrusions 5 are arranged discontinuously, inclined or wavy in the pitch direction. When the material is compressed and conveyed, these structures can generate multi-directional local shearing, kneading and mixing effects when the material passes through, effectively breaking up pigment agglomerates inside the masterbatch and promoting the initial dispersion of pigments and carrier resin.

[0023] 3. Anti-clogging groove cleaning: The top of the thread (thread edge) of the compression section 2 is rounded or chamfered, and a high-hardness, high-wear-resistant ceramic coating or diamond-like carbon (DLC) coating is applied to this top area to prevent pigment particles from accumulating and wearing in the high-pressure area.

[0024] Metering section 3 optimization: The thread diameter of the metering section 3 gradually decreases, and the screw body 7 of the metering section 3 is tapered, with the diameter gradually decreasing towards the discharge point.

[0025] Conical Design: Metering section 3 adopts a conical design, meaning the thread diameter gradually decreases. This compresses the volume of material as it flows through metering section 3, thereby increasing the material's density and uniformity. This design allows for more precise control of the material extrusion rate and improves metering stability.

[0026] Self-lubricating and anti-adhesion surfaces: The threaded sidewalls (radial side) and thread tops of metering section 3 can employ a microporous structure 6 with embedded self-lubricating material. These micropores are filled with self-lubricating substances with low coefficient of friction, such as PTFE, graphite, or MoS2. During screw operation, these substances slowly precipitate, forming an ultra-thin sliding layer on the screw surface, significantly reducing material adhesion and facilitating cleaning. Specific Implementation Example

[0027] A screw for a masterbatch feeder includes a screw body 7, which is provided with a feeding section 1, a compression section 2 and a metering section 3 in sequence along the axial direction.

[0028] The threaded groove of feed section 1 is a wide and shallow groove, and the outer diameter of the thread is slightly increased in the feed port area. The bottom of the threaded groove of feed section 1 is provided with a radially outward vent hole 4, and the diameter of the vent hole 4 is 0.5mm.

[0029] The inner wall of the threaded groove of the compression section 2 is periodically provided with staggered protrusions 5. These structures are discontinuous and inclined in the pitch direction, with an inclination angle of 30°.

[0030] The thread diameter of the metering section 3 gradually decreases, and the screw body 7 of the metering section 3 is tapered, with the diameter gradually decreasing towards the discharge point. The thread sidewall of the metering section 3 adopts a microporous structure 6 with embedded self-lubricating material. The ratio of the minimum thread diameter to the maximum thread diameter of the metering section 3 is 1:1.5. Example

[0031] It is basically the same as Example 1, except that: The feed section 1 adopts a gradually increasing screw pitch.

[0032] The protruding structure 5 of the compression section 2 is arranged in a wave-like pattern.

[0033] The thread top of metering section 3 adopts a microporous structure 6 with embedded self-lubricating material.

[0034] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A screw for a masterbatch feeder, comprising a screw body, wherein the screw body is provided with a feeding section, a compression section and a metering section sequentially along the axial direction, characterized in that: The feed section has a wide and shallow thread groove, and the outer diameter of the thread is slightly increased in the feed port area or the pitch is gradually increased. The inner wall of the threaded groove of the compression section is periodically provided with staggered protrusions, which are arranged discontinuously, inclined or wavy in the pitch direction. The thread diameter of the metering section gradually decreases, and the screw body of the metering section is tapered, with the diameter gradually decreasing towards the discharge point.

2. The screw of the masterbatch feeder according to claim 1, characterized in that, The bottom of the feed section threaded groove is provided with a radially outward vent hole, the diameter of which is 0.1mm to 1mm.

3. The screw of the masterbatch feeder according to claim 1, characterized in that, The threaded sidewalls and / or threaded tops of the metering section employ a microporous structure with embedded self-lubricating material.

4. The screw of the masterbatch feeder according to claim 1, characterized in that, The tilt angle of the protrusion structure ranges from 15° to 60°.

5. The screw of the masterbatch feeder according to claim 1, characterized in that, The ratio of the minimum thread diameter to the maximum thread diameter in the metering section is 1:1.5.

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