Multi-color cross color mixer for EVA (Ethylene Vinyl Acetate) injection molding

Abstract

The utility model discloses a multicolor cross color mixer for EVA (Ethylene Vinyl Acetate) injection molding, which relates to the technical field of injection molding and comprises a multi-channel feeding unit which at least comprises two independent feeding ports and is used for respectively conveying molten raw materials with different colors, and a melting runner is communicated with the multi-channel feeding unit and is communicated with the multi-channel feeding unit. And the at least one material outlet is used for guiding the melts with different colors to form a cross flow path, and the at least one material outlet is communicated with the melting runner and used for outputting the melts with different colors into a mold cavity. According to the color mixing effect, multi-channel feeding is matched with a unique flow dividing structure, melt with different colors is guided to form a cross flowing path, the problems of color layering and fuzzy boundary of a traditional process are solved, complex patterns such as gradual change and cross textures can be generated, the product attractiveness and design diversity are improved, and the production cost is reduced. In the aspects of production efficiency and cost control, the color mixer avoids repeated injection molding and frequent mold adjustment, the production period is shortened, and raw material waste and equipment maintenance cost are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to injection molding technical field, concretely is a kind of multicolor cross color mixer for EVA injection molding. BACKGROUND

[0002] Current EVA injection molding equipment mainly relies on single color gun tube structure, only single color melt injection can be realized, specifically, single color EVA particles are heated and melted by screw equipment, then directly injected into mold to form, wherein gun tube structure includes heating zone, compression zone and metering zone, ensure that melt is uniformly plasticized, but only support continuous conveying of single color raw material.

[0003] To meet the needs of multicolor products, the industry generally uses partition plate process or mold cavity filling method, the former fills different color raw materials by setting physical partition plate in mold, and the latter relies on prepositioning multicolor raw material block in mold cavity, and realizes simple color block splicing by multiple injection molding, however, such method essentially belongs to passive mixing, melt lacks active regulation in flow process, resulting in that mixing effect is limited by mold structure.

[0004] The above process has the following significant deficiencies: first, melt mixing is insufficient in partition plate or mold cavity process, which easily leads to product color stratification, blurred boundary, and cannot generate gradient, cross texture or high-precision biomimetic pattern, second, traditional equipment lacks dynamic mixing control, single-channel temperature control and pressure regulation precision are insufficient, and the flowability difference of different color melts further aggravates uneven color mixing, in addition, multiple injection molding or mold adjustment not only prolongs production cycle, but also causes raw material waste and equipment maintenance cost escalation, which seriously restricts efficiency. UTILITY MODEL CONTENT

[0005] Therefore, the utility model aims at providing a kind of multicolor cross color mixer for EVA injection molding to solve the technical problems in the above background art.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a kind of multicolor cross color mixer for injection molding, comprising:

[0007] Multi-channel feeding unit: at least two independent feeding ports are included, for conveying different color molten raw materials respectively;

[0008] Melt flow channel: it is interconnected with the multi-channel feeding unit, the melt flow channel is equipped with shunt structure, for guiding different color melts to form cross flow path, and guide different color multiple groups of melt flow channel to be arranged in interlaced state, and the axis of multiple groups of melt flow channel is 45 °-90 ° intersection;

[0009] At least one discharge port: intercommunicate with the melt runner, for outputting different color melt into the mold cavity, each feeding port corresponds to at least one group of independent melt runner and discharge port intercommunication;

[0010] The multi-channel feeding unit includes a two-color feeding port, and the two-color feeding port is a first feeding channel and a second feeding channel, the melt runner is a first flow cavity and a second flow cavity, and a plurality of groups of melt runners are distributed in parallel and cross, and the discharge port is a single outlet.

[0011] The multi-channel feeding unit includes a three-color feeding port, and the three-color feeding port is a first feeding channel, a second feeding channel and a third feeding channel, the melt runner includes a first flow cavity, a second flow cavity and a third flow cavity, and a plurality of groups of melt runners are distributed in parallel and cross, and the discharge port is a single outlet.

[0012] The discharge port is two independent outlets, and the two independent outlets are a first independent outlet and a second independent outlet, the first independent outlet is a flat outlet, and the second independent outlet is a circular outlet.

[0013] The flow distribution structure is a spiral guide plate and a multi-stage staggered guide groove, which is used for increasing the turbulent mixing effect of the melt.

[0014] By adopting the above technical scheme, through the multi-channel feeding and the unique flow distribution structure, the cross-flow path of different color melts is guided, the problems of color stratification and blurred boundary in the traditional process are solved, complex patterns such as gradient and cross texture can be generated, the product appearance and design diversity are improved, in terms of production efficiency and cost control, the color mixer avoids multiple injection molding and frequent mold adjustment, shortens the production cycle, reduces raw material waste and equipment maintenance cost.

[0015] Further, the adjusting module is used for independently controlling the melt flow rate, temperature and pressure of each feeding channel, the adjusting module adopts a controller and a pressure sensor, and the flow rate and temperature are adjusted in real time.

[0016] By adopting the above technical scheme, through the precise control of the melt flow rate, temperature and pressure of each feeding channel by the adjusting module, the difference in flowability of different color melts is effectively dealt with, the color mixing is uniform and stable, the product quality is improved, the market competitiveness of the product is enhanced, and the development of the injection molding industry is promoted.

[0017] In summary, this utility model has the following beneficial effects: By employing a multi-channel feeding system combined with a unique flow-dividing structure to guide different colored molten materials to form intersecting flow paths, this utility model solves the problems of color layering and blurred boundaries in traditional processes. It can generate complex patterns such as gradients and cross-textures, enhancing product aesthetics and design diversity. In terms of production efficiency and cost control, this color mixer avoids multiple injection molding processes and frequent mold adjustments, shortening the production cycle and reducing raw material waste and equipment maintenance costs. Through precise control of the molten material flow rate, temperature, and pressure in each feeding channel via the adjustment module, it effectively addresses the differences in the fluidity of different colored molten materials, ensuring uniform and stable color mixing, improving product quality, enhancing product market competitiveness, and promoting the development of the EVA injection molding industry. Attached Figure Description

[0018] Figure 1 This is a first-view structural schematic diagram of Embodiment 1 of the present utility model;

[0019] Figure 2 This is a second-view structural schematic diagram of Embodiment 1 of the present invention;

[0020] Figure 3 This is a front perspective view of Embodiment 1 of the present utility model;

[0021] Figure 4 This is a rear view of Embodiment 1 of the present utility model;

[0022] Figure 5 This is a first-view structural schematic diagram of Embodiment 2 of the present invention;

[0023] Figure 6 This is a front perspective view of Embodiment 2 of the present invention;

[0024] Figure 7 This is a second-view structural schematic diagram of Embodiment 2 of the present invention;

[0025] Figure 8 This is a third-view structural diagram of Embodiment 2 of the present invention;

[0026] Figure 9 This is a schematic diagram of the fourth perspective structure of Embodiment 2 of this utility model;

[0027] Figure 10 This is a first-view structural schematic diagram of Embodiment 3 of the present invention;

[0028] Figure 11 This is a second-view structural schematic diagram of Embodiment 3 of the present invention;

[0029] Figure 12 This is a third-view structural diagram of Embodiment 3 of the present invention;

[0030] Figure 13 This is a front perspective view of Embodiment 3 of this utility model;

[0031] Figure 14 This is a front perspective view of Embodiment 4 of this utility model;

[0032] Figure 15 This is a side perspective view of Embodiment 4 of the present invention;

[0033] Figure 16 This is a first-view structural schematic diagram of Embodiment 4 of the present invention;

[0034] Figure 17 This is a second-view structural schematic diagram of Embodiment 4 of the present invention;

[0035] Figure 18 This is a third-view structural diagram of Embodiment 4 of the present invention.

[0036] In the diagram: 10, feed inlet; 10a, first feed channel; 10b, second feed channel; 10c, third feed channel; 20, melt flow channel; 20a, first flow chamber; 20b, second flow chamber; 20c, third flow chamber; 30, discharge outlet; 30a, first independent outlet; 30b, second independent outlet; 31, flat outlet; 32, circular outlet; 40, flow splitting structure; 41, spiral guide plate; 42, multi-stage staggered guide channel. Detailed Implementation

[0037] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0038] The embodiments of this utility model will be described below based on its overall structure.

[0039] Example 1

[0040] A multi-color cross-mixer for EVA injection molding, such as Figures 1-4 As shown, it mainly consists of a multi-channel feeding unit, a melt flow channel 20, and a discharge port 30. The multi-channel feeding unit includes a first feeding channel 10a and a second feeding channel 10b, which are used to transport two different colors of EVA molten raw materials. The melt flow channel consists of a first flow chamber 20a and a second flow chamber 20b, which are arranged in parallel and cross-distributed with an axial angle of 60°. The flow splitting structure adopts a spiral guide plate 41, which is installed inside the melt flow channel 20. The discharge port is a single outlet 30, which is used to output the mixed melt to the mold cavity.

[0041] In the EVA injection molding process, two different colored EVA particles are added to the corresponding first feed channel 10a and second feed channel 10b respectively. After the raw materials are heated and melted by external equipment, they enter their respective first flow chambers 20a and second flow chambers 20b. Under the action of the spiral guide plate 41, the different colored melts form cross flow paths during the flow process. The melts are output from a single outlet 30 and injected into the mold cavity, finally forming an EVA product with a two-color mixing effect.

[0042] During the color mixing process, the adjustment module plays an important role. The adjustment module uses a PID controller and a pressure sensor to monitor and adjust the melt flow rate, temperature and pressure of each feed channel in real time. For example, when it is detected that the melt flow rate in the first feed channel 10a is too fast, resulting in uneven mixing of the two colors, the PID controller will automatically adjust the temperature and pressure of the feed channel according to the data fed back by the pressure sensor, reduce the melt flow rate, and ensure that the melts of the two colors can be mixed evenly.

[0043] Example 2

[0044] like Figures 5-9 As shown, the multi-channel feeding unit includes a first feeding channel 10a, a second feeding channel 10b, and a third feeding channel 10c, which are used to transport three different colors of EVA molten raw materials. The molten flow channel is composed of a first flow chamber 20a, a second flow chamber 20b, and a third flow chamber 20c, which are arranged in parallel and cross-shaped. The included angle between the axes of adjacent flow chambers is 45°. The flow splitting structure adopts a multi-stage staggered guide channel 42, which is set inside each molten flow channel. The discharge port 30 is also a single outlet.

[0045] Three different colored EVA particles enter the color mixer from their respective feed channels. After being heated and melted, the molten material flows into their respective flow chambers. The multi-stage staggered flow channels 42 guide the molten material of different colors to form a complex cross flow path. Since the flow chambers are at a 45° angle, the molten material is output from a single outlet 30 for mixing and enters the mold cavity to form an EVA product with a three-color mixing effect.

[0046] The adjustment module continuously monitors the molten state of each feed channel. Since it involves the mixing of three colors of molten material, the control requirements for flow rate, temperature and pressure are higher. Based on the data fed back by the pressure sensor, the adjustment module uses a PID controller to precisely adjust the parameters of each feed channel. For example, if it is found that the molten temperature of the third feed channel 10c is too high, resulting in a large difference in its fluidity compared to the other two colors of molten material, the adjustment module will reduce the temperature of that channel to keep the three colors of molten material in similar fluidity during the mixing process, thereby achieving uniform mixing.

[0047] Example 3

[0048] like Figures 10-18 As shown, the multi-channel feeding unit consists of a first feeding channel 10a and a second feeding channel 10b. The molten flow channel is a first flow chamber 20a and a second flow chamber 20b, which are arranged in parallel and cross-shaped with an axial angle of 90°. The flow splitting structure adopts a combination of a spiral guide plate 41 and a multi-stage staggered guide groove 42. The discharge port 30 has two independent outlets, namely a flat outlet 31 and a circular outlet 32.

[0049] Two colors of EVA molten raw materials enter the color mixer from the first feed channel 10a and the second feed channel 10b, respectively. In the molten flow channel, the spiral guide plate 41 and the multi-stage staggered guide groove 42 work together to make the molten material flow more smoothly. The molten material is output from the flat outlet 31 and the round outlet 32, respectively. The flat outlet 31 is suitable for molding flat or special textured parts of the product, while the round outlet 32 ​​is suitable for round or cylindrical parts of the product. For example, when producing shoe soles with a two-color mixing effect, the flat part of the shoe sole can be supplied with molten material by the flat outlet 31, while the round parts such as the heel are supplied with molten material by the round outlet 32.

[0050] The adjustment module performs differentiated control of the parameters of the feeding channel according to the needs of different outlets. Since the flat outlet 31 and the round outlet 32 ​​have different shapes, the requirements for the flow rate and pressure of the molten material are also different. The adjustment module uses a PID controller and a pressure sensor to precisely adjust the feeding channels corresponding to the two outlets respectively. For example, in order to ensure that the flat outlet 31 can uniformly fill the flat mold cavity, the adjustment module will appropriately increase the pressure of the corresponding feeding channel and adjust the flow rate of the molten material to ensure that the molten material can be smoothly extruded from the flat outlet and achieve good fusion with the molten material extruded from the round outlet 32.

[0051] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, and variations are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. A multi-color cross-mixer for EVA injection molding, characterized by, The application relates to a multi-channel feeding unit for a plastic injection molding machine. The multi-channel feeding unit comprises at least two independent feeding ports (10) for respectively feeding different colors of molten raw materials; a molten flow channel (20) in communication with the multi-channel feeding unit, wherein a flow distribution structure (40) is arranged in the molten flow channel (20) for guiding the molten materials of different colors to form a cross-flow path, and a plurality of groups of molten flow channels (20) are arranged in a cross state, and the axes of the plurality of groups of molten flow channels (20) are crossed at an angle of 45-90 degrees; and at least one discharge port (30) in communication with the molten flow channel (20) for outputting the molten materials of different colors into a mold cavity, wherein each feeding port (10) is connected with at least one group of independent molten flow channels (20) and discharge ports (30). The multi-channel feeding unit comprises two-color feeding ports, namely a first feeding channel (10a) and a second feeding channel (10b), the molten flow channel (20) comprises a first flow cavity (20a) and a second flow cavity (20b), and a plurality of groups of molten flow channels (20) are arranged in a parallel cross state, and the discharge port (30) is a single outlet. The multi-channel feeding unit comprises three-color feeding ports, namely a first feeding channel (10a), a second feeding channel (10b) and a third feeding channel (10c), the molten flow channel (20) comprises a first flow cavity (20a), a second flow cavity (20b) and a third flow cavity (20c), and a plurality of groups of molten flow channels (20) are arranged in a parallel cross state, and the discharge port (30) is a single outlet.

2. The multi-color cross-mixer for EVA injection molding according to claim 1, wherein: The discharge port (30) is two independent outlets, namely a first independent outlet (30a) and a second independent outlet (30b).

3. The multi-color cross-mixer for EVA injection molding according to claim 1, wherein: The first independent outlet (30a) is a flat outlet (31), and the second independent outlet (30b) is a circular outlet (32).

4. The multi-color cross-mixer for EVA injection molding according to claim 1, wherein: The application further comprises an adjusting module for independently controlling the flow rate, temperature and pressure of the molten materials of each feeding channel, wherein a PID controller and a pressure sensor are adopted to realize real-time feedback and adjustment of the flow rate and temperature.

5. The multi-color cross-mixer for EVA injection molding according to claim 4, wherein: The flow distribution structure (40) is a spiral flow guide plate (41) and a multi-stage staggered flow guide groove (42) for increasing the turbulent mixing effect of the molten materials.

6. The multi-color cross-mixer for EVA injection molding of claim 1, wherein: ​ 7. The multi-color cross-mixer for EVA injection molding of claim 1, wherein: ​

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