CN117001937A

CN117001937A - Nozzle, color mixing injection molding machine and gradual texture injection molding method

Info

Publication number: CN117001937A
Application number: CN202310963918.5A
Authority: CN
Inventors: 罗贤国; 胡佳伟; 李燕华; 常丽君; 周家福
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2023-08-02
Filing date: 2023-08-02
Publication date: 2023-11-07

Abstract

The application relates to the technical field of injection molding and color mixing, in particular to a nozzle, a color mixing injection molding machine and a gradual texture injection molding method. The injection nozzle comprises an injection nozzle body, the injection nozzle body comprises an injection runner, the injection runner is used for being connected with an injection molding assembly, the injection molding assembly can convey injection molding materials to the injection runner, the length of the injection runner is shortened to reduce the residence time of the injection molding materials in the injection runner, the residence time of the injection molding materials in the runner channel can be effectively reduced, the problem of mutual mixing among various injection molding materials is effectively avoided, and the effect of mixed injection molding is improved.

Description

Nozzle, color mixing injection molding machine and gradual texture injection molding method

Technical Field

The application relates to the technical field of injection molding and color mixing, in particular to a nozzle, a color mixing injection molding machine and a gradual texture injection molding method.

Background

The plastic products with more than two colors are widely used, so that the requirements on injection molding equipment and process for molding the color-mixed plastic products are increased. The mixed color plastic products produced by the mixed color injection molding machine also gradually trend. The color-mixed plastic product is formed by mixing all colors of the plastic product, the color at the boundary of the color is transitionally and gradually changed, and the shape of the pattern is not particularly regular and randomly changed. However, the existing color mixing injection molding mode often has the problems that two materials are mixed too early or the materials interfere with each other due to too long residence time in a public runner, a backflow phenomenon is generated, the plastic color mixing effect is affected, the product quality is not easy to control, and the rejection rate is high. Since more colors are easier to blend colors, it is difficult to make various color graded textured injection molded articles by a color blending injection molding machine.

Aiming at the problem, the prior art carries out shading printing on the basis of gradient color printing, thereby enhancing the visual effect of appearance. However, the scheme has the advantages of increased material consumption, complex operation and higher cost. Moreover, the machine equipment is relatively expensive, is not suitable for printing on irregularly shaped and rugged surfaces or on products with asymmetric 3D surfaces, otherwise causes insufficient brightness of the ink, and cannot achieve the color saturation of the set effect.

Disclosure of Invention

One of the purposes of the present application is to avoid the defects in the prior art and provide a nozzle, which can effectively reduce the residence time of the injection molding material in the runner channel, effectively avoid the problem of mixing various injection molding materials, and improve the effect of mixed injection molding.

The second object of the present application is to provide a color mixing injection molding machine.

The third objective of the present application is to provide a gradual texture injection molding method.

In order to achieve one of the above objects, the present application provides the following technical solutions:

there is provided a nozzle comprising: the injection nozzle comprises an injection nozzle body, wherein the injection nozzle body comprises an injection runner, the injection runner is used for being connected with an injection molding assembly, the injection molding assembly can convey injection molding materials to the injection runner, and the length of the injection runner is shortened so that the injection molding materials are not mixed in the injection runner.

Because the length of the injection runner is shortened, the residence time of the injection molding material in the injection runner is shortened, and the problem of mixed material and color of the injection molding material in the injection runner can be avoided.

In some embodiments, the length of the jet flow channel is no greater than 5cm.

The length of the runner which is not more than 5cm can be effectively shortened, and the molten rubber can be injected into the mould, so that the injection force is ensured.

The nozzle has the beneficial effects that:

according to the injection nozzle, the length of the runner in the injection nozzle is shortened, so that the residence time of injection molding materials in the runner is reduced, the blending of various colors of injection molding materials in the injection nozzle is avoided, the texture and quality of products are well controlled, and the plastic products with clear boundaries and good color mixing effect are obtained.

In order to achieve the second object, the present application provides the following technical solutions:

there is provided a color mixing injection molding machine comprising at least two cartridges, the output ends of at least two of the cartridges being connected to the nozzle of claim 1 or 2.

The nozzle with shortened runner length is used, after the melt adhesive of the charging barrel is injected into the nozzle, the residence time of the melt adhesive with color in the nozzle is reduced, the melt adhesive can not be mixed in advance in the nozzle, the texture and the quality of plastic products can be effectively ensured, and the visual effect of the plastic products is improved.

In some embodiments, one end of each charging barrel is connected with a corresponding melting part, the other end is connected with the injection nozzle through the same color mixer, and an injection outlet of the injection nozzle is connected with a forming die.

One end of each charging barrel is connected with the corresponding melting part, so that the injection molding materials in each charging barrel can be independently arranged, more production requirements are met, and the required gradual change texture is formed; the other end of the charging barrel is connected with the nozzle through the same color mixer. Therefore, injection molding materials in the charging barrels are injected into the injection nozzle through the color mixer, and the grooves in the color mixer enable the injection molding materials in the charging barrels to flow and be primarily mixed in the grooves, so that the primary gradual change texture effect arrangement is realized.

In some embodiments, the color mixer is a core-spun color mixer.

A plurality of pore canals are arranged in the core-spun head color mixer, and the pore canals can effectively prevent the melt adhesive from being mixed in an interference manner, so that the gradual change effect is better.

In some embodiments, the mold comprises a cavity, a fan gate and an S-shaped runner, wherein one end of the fan gate is connected with the cavity in a penetrating way, and the other end of the fan gate is connected with the S-shaped runner.

The fan-shaped pouring gate is convenient for dispersing the melt adhesive, and the S-shaped flow channel delays the entering speed of the melt adhesive, so that the melt adhesive can be filled better, the injection molding effect is improved, and bubbles are avoided.

In some embodiments, the melt portion includes a base and a hopper, the hopper is disposed on the base, a screw is disposed in the base, and the base is connected to the barrel.

The melting part is used for preliminarily melting and injecting plastic. The hopper is used for loading materials, and the screw rod in the seat is used for introducing injection molding materials in the hopper into the charging barrel through a material storage action.

The color mixing injection molding machine has the beneficial effects that:

according to the color mixing injection molding machine, the injection nozzle with the shortened runner length is used, after the melt adhesive of the charging barrel is injected into the injection nozzle, the residence time of the melt adhesive with color in the injection nozzle is reduced, the melt adhesive cannot be mixed in advance in the injection nozzle, the texture and the quality of plastic products can be effectively ensured, and the visual effect of the plastic products is improved; and the nozzle can reduce residual melt adhesive after being shortened, thereby reducing the influence of the residual melt adhesive.

In order to achieve the third object, the present application provides the following technical solutions:

the gradual texture injection molding method is provided, and the color mixing injection molding machine comprises the following steps:

preparing injection molding materials according to texture requirements, so that the injection molding materials contain raw materials and pigments, adding corresponding injection molding materials into each charging barrel, heating and melting the injection molding materials to obtain melt adhesive for injection molding;

and injecting the melt adhesive into the injection nozzle according to a set sequence by each charging barrel, wherein the injection nozzle injects the melt adhesive into a mould, and the mould forms the melt adhesive into an injection molding piece with gradual change textures.

The short injection nozzle is adopted, the residence time of the injection molding material in the injection nozzle is short, the problem of color mixing of the injection molding material in the injection nozzle is effectively avoided, the color extension of the injection molding material in the mold is ensured, and the plastic product with clear boundary and good color mixing effect can be prepared. In addition, the injection molding method can avoid the problem of advanced color mixing of the colored injection molding materials, so that the color mixing can not easily occur even if the injection molding materials have multiple colors, and the injection molding parts with clear boundaries and multiple gradual change textures with good color mixing effect can be obtained.

In some embodiments, some cartridges are also fed with colorant from other cartridges.

The pigments in other charging barrels are added into part of charging barrels, so that the whole gradual change texture effect of the injection molding part is more fused and natural.

In some embodiments, the injecting the molten rubber into the nozzle by each cartridge according to a set sequence is performed according to the following steps: setting the number of injection molding sections of each charging barrel, and injecting the melt adhesive of each injection molding section into the nozzle by each charging barrel according to a set program.

In some embodiments, the process causes each cartridge to simultaneously inject the melt adhesive into the nozzle or alternately inject the melt adhesive into the nozzle.

In some embodiments, after the nozzle has finished injecting the melt adhesive into the mold, the cartridge that was initially injected with the melt adhesive is also caused to inject a quantity of melt adhesive into the nozzle.

And after injection molding is finished, a certain amount of molten rubber of a charging barrel for injecting the molten rubber initially is fed, so that the tail section molten rubber of the previous molded product is prevented from being glued at the head end of the next molded product, the consistency of gradual change textures of the products is ensured, the consistency of gradual change texture effects of each molded product can be ensured, and standardized production is facilitated.

Different texture schemes have different injection molding parameters, and a plurality of charging barrels can be simultaneously in an injection molding mode or alternately in the injection molding mode through the injection molding parameters of the injection molding section number. The number of injection molding sections can be increased from 1 section to 10 sections at most, and can be adjusted according to actual needs.

In some embodiments, the injection pressure of the molten rubber injected into the charging barrel is 50-160bar, and the injection speed is 10-90%.

In some embodiments, when the injection molding material is melted at an elevated temperature, the melting temperature is controlled in accordance with the melting point of the colorant so that the melting rates of the colorants of different colors are different.

The melting temperature is controlled according to the melting point of the pigment, so that the pigment is melted to generate sequence, and then the pigment melted first and the pigment melted later are generated without generating color mixing problem in the same charging barrel, thereby ensuring that only texture effect is generated between the pigments in the mould and improving the texture effect of the injection molding part.

The gradient texture injection molding method has the beneficial effects that:

(1) The gradual-change texture injection molding method adopts the short injection nozzle, so that the residence time of the injection molding material in the injection nozzle is short, the problem of color mixing of the injection molding material in the injection nozzle is effectively avoided, the color extension of the injection molding material in the mold is ensured, and the plastic product with clear boundary and good color mixing effect can be prepared. In addition, the injection molding method can avoid the problem of advanced color mixing of the colored injection molding materials, so that the color mixing can not easily occur even if the injection molding materials have multiple colors, and the injection molding parts with clear boundaries and multiple gradual change textures with good color mixing effect can be obtained.

(2) The gradual change texture injection molding method adopts the injection molding method of the injection molding machine to prepare the gradual change texture, the injection molding process can mold surfaces with various shapes and form the gradual change texture on the surfaces with various shapes, the gradual change texture injection molding method is not limited by the surface shape of an injection molding piece, and the gradual change texture injection molding method is suitable for mass production and application. In addition, the injection molding method can prepare corresponding injection molding products through the original injection molding machine, has low cost and is suitable for large-scale production and application.

The injection molding part is manufactured by the injection molding method.

In some embodiments, the injection molded part has an uneven surface.

The gradual change texture injection molding method can adjust the mixing proportion or the raw material proportion in the charging barrel according to the self requirement, so that more diversified products are obtained, and the problems that the gradual change texture manufacturing cost is relatively high, the machine equipment is relatively expensive, the gradual change texture injection molding method is not suitable for printing products with irregular shapes and uneven shapes, the 3D curved surface is asymmetric, the brightness of the printing ink is insufficient, and the setting effect cannot be achieved are solved.

The application of the gradual change texture injection molding piece in the household appliance shell is also provided.

The texture gradual change plastic part is arranged in the shell of the household electrical appliance, so that the variety and visual effect of the household electrical appliance are improved.

Drawings

Fig. 1 is a schematic structural view of a double color mixing injection molding machine according to an embodiment.

Fig. 2 is a schematic structural view of a mold of the embodiment.

Fig. 3 is a schematic illustration of a product where a cavity, gate and runner of an embodiment are formed.

Fig. 4 is a texture effect diagram of an injection molded part having an embodiment.

Reference numerals:

1. a nozzle; 2. a charging barrel; 3. a melting section; 31. a seat stand; 32. a hopper; 4. a color mixer; 5. a plastic member; 6. a fan gate; 7. an S-shaped runner; 8. a positioning ring; 9. a fixed die fixing plate; 10. a stationary mold plate; 11. a movable template; 12. square iron; 13. a movable mold fixing plate; 14. a mold; 15. and (5) a material extractor.

Detailed Description

Preferred embodiments of the present application will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present application are shown in the drawings, it should be understood that the present application may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the application to those skilled in the art.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.

It should be understood that although the terms "first," "second," "third," etc. may be used herein to describe various information, these information should not be limited by these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the application. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

Example 1

The nozzle 1 disclosed in this embodiment, as shown in fig. 1, includes a nozzle body, the nozzle body includes a jet runner, the jet runner is used for being connected with an injection molding assembly, the injection molding assembly can carry injection molding material to the jet runner, the length of the jet runner is shortened so that the injection molding material does not mix in the jet runner. Because the length of the injection runner is shortened, the residence time of the injection molding material in the injection runner is reduced, so that the injection molding material is not mixed in the injection nozzle.

The nozzle 1 has the functions and advantages that: by shortening the length of the runner in the nozzle 1, the residence time of the injection molding material in the runner is reduced, the blending of various colors of the injection molding material in the nozzle 1 is avoided, the texture and quality of the product are well controlled, and the plastic product with clear boundary and good color mixing effect is obtained.

In this embodiment, the length of the injection flow channel is not greater than 5cm. The runner length of not more than 5cm can be shortened effectively and the injection of the melt adhesive into the mold 14 can be achieved, ensuring the injection force. In specific application, the length of the injection flow passage of the injection nozzle 1 can be adjusted according to actual conditions, and only the color of the injection molding material is ensured not to be mixed in the injection flow passage.

Example 2

The color mixing injection molding machine disclosed in this embodiment, as shown in fig. 1 to 3, includes at least two barrels 2, at least two output ends of the barrels 2 are connected to a nozzle 1, the nozzle includes a nozzle body, a nozzle body injection runner for connecting with the barrels 2, the barrels 2 deliver injection molding material to the injection runner, the length of the injection runner is shortened to reduce the residence time of the injection molding material in the injection runner, and the length of the injection runner is 5CM, and the length of the barrel 2 is 120CM. Since the length of the injection runner is shortened, the residence time of the injection molding material in the injection runner is reduced.

Wherein, feed cylinder 2 divide into unloading district, plasticization district and prevent three district of curtain coating district, and the feed end of feed cylinder 2 is unloading district: the temperature setting in the blanking area is lower in general, the temperature in the three areas is the lowest, the section is mainly used for preheating materials around the melting point of plastics, the plastics with too high temperature can be melted, the screw is easy to slip and influence the material conveying, and the screw torque is large if the screw is too low. The middle part is a plasticizing zone: the plasticizing zone is in the middle of the barrel 2, the temperature is gradually increased to be higher than the melting point, and the section mainly melts and plasticizes the materials. Casting prevention area near output end: the casting-preventing zone is arranged at the forefront end of the machine barrel and is close to the nozzle 1, and the temperature of the casting-preventing zone is slightly lower than that of the plasticizing zone, so that molten materials are mainly prevented from flowing out of the nozzle under the action of internal pressure. The barrel 2 is divided into a plurality of temperature sections, so that the problem of color mixing caused by overhigh temperature of color components in the injection molding material can be effectively prevented.

According to the color mixing injection molding machine, the nozzle 1 with the shortened runner length is used, after the melt adhesive of the charging barrel 2 is injected into the nozzle 1, the residence time of the melt adhesive with color in the nozzle 1 is reduced, the melt adhesive cannot be mixed in advance in the nozzle 1, the texture and the quality of plastic products can be effectively ensured, and the visual effect of the plastic products is improved.

In this embodiment, one end of each of the cartridges 2 is connected to the corresponding melting portion 3, so that the injection molding materials in each of the cartridges 2 can be set independently, and the injection molding materials are suitable for more production requirements, and form the required gradual change textures; the other end of the charging barrel 2 is connected with the nozzle 1 through the same color mixer 4. Therefore, the injection molding materials in the charging barrels 2 are injected into the injection nozzle 1 through the color mixer 4, and the grooves in the color mixer 4 enable the injection molding materials in the charging barrels 2 to flow and be primarily mixed in the grooves, so that the primary gradual change texture effect arrangement is realized.

Preferably, the color mixer 4 is a core-spun head color mixer 4, and a plurality of pore canals are arranged in the core-spun head color mixer 4, so that the interference mixing of the melt adhesive can be effectively avoided, and the gradual change effect is better.

In this embodiment, the injection outlet of the nozzle 1 is connected with the forming mold 14, and the nozzle 1 is then introduced into the gate and the cavity of the mold 14, and finally the product with gradual texture effect is obtained under the cooling and shaping of the mold 14.

As shown in fig. 3, the injection mold 14 of the present embodiment is illustratively a color plate injection mold 14, and the injection mold 14 includes a positioning ring 8, a fixed mold plate 9, a fixed mold plate 10, a movable mold plate 11, a square iron 12, and a movable mold fixing plate 13. The middle part of the fixed die fixing plate 9 is provided with a positioning ring 8 for positioning the position of the nozzle 1, a cavity is arranged between the fixed die plate 10 and the movable die plate 11, and the nozzle 1 feeds melt adhesive into the cavity through a sprue bush. Square iron 12 is arranged between the movable die plate 11 and the movable die fixing plate 13, and demoulding is carried out through a top rod hole at the bottom of the movable die fixing plate 13.

Specifically, a colored plate product is arranged in the cavity, one end of the fan-shaped gate 6 is connected with the cavity in a penetrating way, and the other end of the fan-shaped gate is connected with the S-shaped runner 7. The fan-shaped pouring gate 6 is convenient for dispersing the melt adhesive, and the S-shaped flow channel 7 delays the entering speed of the melt adhesive, so that the melt adhesive can be filled better, the injection molding effect is improved, and bubbles are avoided.

In this embodiment, the melting part 3 includes a base 31 and a hopper 32, the hopper 32 is provided on the base 31, a screw is provided in the base 31, and the base 31 is connected to the barrel 2. The melting part 3 is used for preliminary melting of the injection molding material. The hopper 32 is used for loading materials, and the screw in the seat 31 introduces injection molding materials in the hopper 32 into the barrel 2 through a material storage action. In actual operation, an operation panel is arranged, a storage button is selected on the operation panel, a screw rod in the seat table 31 rotates backward, injection molding materials are melted under the shearing and heating actions of the screw rod, the screw rod rotates backward, the injection molding materials are extruded forward to a glue storage position, and during production, the next injection molding action can be performed only by pressing the storage button every time, so that production according to the number of sections is realized.

In this embodiment, the hopper 32 is a conical hopper 32, the narrowing end of the conical hopper 32 is connected to the seat 31, and the top of the conical hopper 32 is connected with a extractor, which is convenient for sucking injection molding materials into the hopper 32.

Example 3

The gradual change texture injection molding method disclosed by the embodiment adopts a color mixing injection molding machine, the color mixing injection molding machine comprises at least two charging barrels 2, the output ends of at least two charging barrels 2 are connected to an injection nozzle 1, the injection nozzle comprises an injection nozzle body, an injection runner of the injection nozzle body is used for being connected with the charging barrels 2, the charging barrels 2 convey injection molding materials to the injection runner, and the length of the injection runner is shortened to reduce the residence time of the injection molding materials in the injection runner.

The injection molding method comprises the following steps:

the injection molding material is prepared according to the texture requirements so that the injection molding material contains the raw material and the coloring material, and therefore, the injection molding material injected into one of the cartridges 2 will contain the raw material and the coloring material. Different textures have different requirements on color types, injection molding glue amount and injection molding glue. Then, a corresponding injection molding material is charged into each cylinder 2, and then the injection molding material is melted by heating, so as to obtain a melt adhesive for injection molding, and the raw materials and the pigment are melted in the heating process.

Subsequently, the respective cartridges 2 are filled with the melt adhesive to the nozzle 1 in a set order, and the order in which the injection materials are ejected from the cartridges 2 affects the texture layout, so that the corresponding texture layout can be adjusted by setting the order in which the melt adhesive is filled into the nozzle 1 from the cartridges 2. After the melt adhesive enters the nozzle 1, the nozzle 1 injects the melt adhesive into the mold 14, and the mold 14 forms the melt adhesive into an injection molded article having a gradual texture.

The short injection nozzle 1 is adopted, the residence time of injection molding materials in the injection nozzle 1 is short, the problem of color mixing of the injection molding materials in the injection nozzle 1 is effectively avoided, the color extension of the injection molding materials in the mold 14 is ensured, and the plastic product with clear boundary and good color mixing effect can be prepared. In addition, the injection molding method can avoid the problem of advanced color mixing of the colored injection molding materials, so that the color mixing can not easily occur even if the injection molding materials have multiple colors, and the injection molding parts with clear boundaries and multiple gradual change textures with good color mixing effect can be obtained. Compared with the modes of printing, spraying and the like, the method has the advantages of cost reduction, environmental protection, simplicity and convenience in operation and the like due to the adoption of mixed double injection molding, the gradual change texture presentation effect of the decorative panel can be effectively realized through the key process and method for controlling the gradual change texture, and the gradual change texture is good in texture and strong in layering sense, so that the high-end presentation effect of the whole household appliance and the effect of attracting the attention of customers are improved.

The function and the benefits of the gradual texture injection molding method are as follows: the gradual change texture is prepared by adopting an injection molding method of an injection molding machine, the surface of various shapes can be molded in the injection molding process, the gradual change texture is formed on the surface of various shapes, the gradual change texture is not limited by the surface shape of an injection molding piece, and the gradual change texture is suitable for mass production and application. In addition, the injection molding method can prepare corresponding injection molding products through the original injection molding machine, has low cost and is suitable for large-scale production and application.

In this embodiment, some of the cartridges are also filled with colorant from other cartridges. Illustratively, if there are a cylinder a and a cylinder B, a small portion of the colorant in the cylinder B is poured into the cylinder a, and illustratively, 10% of the colorant in the cylinder B is poured into the cylinder a, so that the overall progressive texture effect of the injection molded part is more natural.

In this embodiment, the injecting the molten rubber into the nozzle 1 from the cartridges 2 according to the set sequence is performed according to the following steps: the number of injection molding sections of each charging barrel 2 is set, and each charging barrel 2 injects the melt adhesive of each injection molding section into the nozzle 1 according to a set program.

Different texture schemes have different injection molding parameters, and a plurality of charging barrels 2 can be simultaneously in an injection molding mode or alternately in the injection molding mode through the injection molding parameters of the injection molding section number. The number of injection molding sections can be increased from 1 section to 10 sections at most, and can be adjusted according to actual needs.

The injection texture is changed by simultaneously injecting the melt adhesive into the nozzle 1 or alternately injecting the melt adhesive into the nozzle 1, so that the operation is easy; further, the texture can be controlled by adjusting the injection amount, for example, the more the glue amount is, the larger the texture is.

When the nozzle 1 finishes injecting the molten rubber into the mold, the cylinder initially injected with the molten rubber is also made to inject a certain amount of molten rubber into the nozzle. Illustratively, the quantity of melt adhesive is the fill quantity of the nozzle.

After the injection of the melt adhesive into the nozzle 1 is completed, the first-stage melt adhesive is injected into the nozzle 1. That is, after the injection of the melt adhesive is completed, the first-stage melt adhesive to be injected into the next molded article is additionally supplied.

Because the end melt adhesive of a mould product can not be remained inside the injection nozzle 1, the melt adhesive of each product close to the gate end is not the first section melt adhesive of the current production, but the end residual melt adhesive of the last mould product, the color of each mould product close to the gate end is different, so that the consistency of gradual change textures of the products can not be ensured, after the melt adhesive is injected into the injection nozzle 1, the first section melt adhesive is injected into the injection nozzle 1, the consistency of gradual change texture effects of each mould product can be ensured, and standardized production is facilitated. The nozzle 1 of the embodiment is shortened, and the residual melt adhesive in the nozzle 1 of the previous mold product can be better, thereby being beneficial to reducing the influence of the residual melt adhesive on the product.

In this embodiment, the injection pressure of the molten rubber injected into the charging barrel 2 is 50-160bar, and the injection speed is 10% -90%. The injection pressure for most experiments is generally set at 50-160bar, the speed is 10% -90%, and the injection molding glue amount is set according to the size of the product.

In this embodiment, the injection molding material in each cartridge 2 contains at least two coloring materials, and the colors of the respective coloring materials are different. By shortening the length of the common flow channel in the nozzle 1, the problem of mixed color change of various pigments in the same charging barrel 2 in the nozzle can be reduced, so that even a plurality of pigments are not mixed in the same charging barrel 2, and the texture of gradual change textures is better and the layering sense is stronger.

In this example, when the temperature is raised to melt the injection molding material, the melting temperature is controlled according to the melting point of the coloring material, and the melting speeds of the coloring materials of different colors are made different.

The melting temperature is controlled according to the melting point of the pigments, so that the pigments are melted to generate sequence, and then the pigments melted first and the pigments melted later are generated without generating color mixing problem in the same charging barrel 2, thereby ensuring that only texture effects are generated among the pigments in the die 14 and improving the texture effects of injection molding parts.

Specifically, when the blue PP color masterbatch and the yellow PE color masterbatch are used in the same charging barrel 2, the melting point of PP is 164-170 ℃ and the melting point of PE is 120-125 ℃, so that the temperature can be raised to 120-125 ℃ and then to 164-170 ℃, the mixing time difference between yellow and blue is prolonged, and the problem of color mixing is avoided. In practical application, the temperature of the raw materials needs to be considered.

The parameters of the injection molding are shown in table 1, and can be adjusted according to practical situations.

TABLE 1

Example 4

The embodiment discloses a magic gradient texture injection molding method. Experimental data of the injection molding method are shown in table 1, using a core-spun head color mixer 4, using a barrel a 2 and a barrel B2, adopting an injection molding mode of alternating the barrel a 2 and the barrel B2, injecting the barrel a 2 into a first section to form a texture of a lower end, and injecting the barrel B2 into the first section to form an upper end texture. Finally, the second section of the feed cylinder 2A ensures that the residual melt adhesive in the common flow passage of the nozzle 1 is the material of the feed cylinder 2A, so that the melt adhesive from the next die product is still the material of the feed cylinder 2A, the texture consistency is ensured, and the gradual change texture is finally obtained.

The nozzle 1 in the prior art is longer, so that the common runner of the nozzle 1 is longer, the glue storage amount is more, the texture of the pouring gate end of the injection molding part is uncontrollable, and the color mixing texture of the pouring gate end of the injection molding part can be greatly reduced by matching with the adjustment of injection molding parameters after the nozzle 1 is shortened. A. Not only is barrel 2 used with one color, but a large number of color schemes can be obtained through a large number of color experiments, wherein one color scheme is shown in table 2 above, resulting in an injection molded part with finer, more elegant and natural texture as shown in fig. 4, and having an uneven surface, such as 1 curved surface. In addition, through adjusting parameters such as injection molding pressure, injection molding speed, injection molding amount and the like of the A, B charging barrel 2, gradual change texture distribution is more uniform, lower end textures of an injection molding piece shown in fig. 4 are more blue, a middle area is a transition area of blue-violet mixing, upper end textures are purple textures, and overall feel is higher.

TABLE 2

According to the embodiment, the gradual change texture injection molding method can adjust the mixing proportion or the raw material proportion in the charging barrel 2 according to the self requirements, so that more diversified products are obtained, the advantages of cost reduction, environmental protection, simplicity and convenience in operation and the like are achieved, the gradual change texture is good in texture and strong in layering sense, the high-end presentation effect of the whole household appliance and the effect of attracting the attention of customers are improved, and the problems that the gradual change texture cost is relatively high, the machine equipment is relatively expensive, the gradual change texture injection molding method is not suitable for printing products with irregular shapes and uneven 3D curved surfaces, the brightness of ink is insufficient, and the setting effect cannot be achieved are overcome.

The embodiment can achieve the purpose of consistent effect of other injection textures by changing the raw material color ratio, the color mixer 4, the injection molding parameters and the like, and can be applied to injection molding methods of other textures such as marble patterns and the like.

Example 5

Texture presentation of existing home appliances or exterior panels of electronic products generally adopts a single-color pattern obtained by color master batches or a single effect obtained by film pasting or UV sensitization; although the requirements of different colors in the market can be met to a certain extent, the technical effect of the stereoscopic depth of field can not be realized, particularly some high-end household appliances are series, the appearance of textures and effects of the decorative panel is particularly important, the sensory experience of consumers is directly influenced, and the graded textures can effectively improve the acceptance of the consumers to the products, so that the research significance of how to provide a graded texture injection molding process is higher.

In view of this problem, the embodiment discloses that the injection molding piece with the gradual change texture manufactured by the embodiment can be an injection molding piece of a small-size household appliance, such as a refrigerator, a washing machine and the like, and the quality of the household appliance is effectively improved when the high-quality gradual change texture injection molding piece is applied to the household appliance.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

In the description of the present application, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present application; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present application.

The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A nozzle, comprising: the injection nozzle comprises an injection nozzle body, wherein the injection nozzle body comprises an injection runner, the injection runner is used for being connected with an injection molding assembly, the injection molding assembly can convey injection molding materials to the injection runner, and the length of the injection runner is shortened so that the injection molding materials are not mixed in the injection runner.

2. The nozzle of claim 1, wherein the length of the injection flow channel is no greater than 5cm.

3. A color mixing injection molding machine, characterized in that it comprises at least two cartridges (2), the output ends of at least two of said cartridges (2) being connected to the nozzle (1) according to claim 1 or 2.

4. A color mixing injection molding machine according to claim 3, characterized in that one end of each of the cartridges (2) is connected to a respective melting section (3) and the other end is connected to the nozzle (1) via the same color mixer (4), the injection outlet of the nozzle (1) being connected to a molding die (14).

5. The color mixing injection molding machine according to claim 4, characterized in that the color mixer (4) is a core-spun color mixer (4).

6. The color mixing injection molding machine according to claim 4, characterized in that the mold (14) comprises a cavity, a fan gate (6) and an S-shaped runner (7), wherein one end of the fan gate (6) is connected with the cavity in a penetrating way, and the other end is connected with the S-shaped runner (7).

7. The color mixing injection molding machine according to claim 4, characterized in that the melt portion (3) comprises a seat (31) and a hopper (32), the hopper (32) is arranged on the seat (31), a screw is arranged in the seat (31), and the seat (31) is connected with the charging barrel (2).

8. A progressive texture injection molding method, characterized in that the color mixing injection molding machine according to any one of claims 3 to 7 is used, comprising the steps of:

preparing injection molding materials according to texture requirements, so that the injection molding materials contain raw materials and pigments, adding corresponding injection molding materials into each charging barrel (2), and heating and melting the injection molding materials to obtain melt adhesive for injection molding;

the method comprises the steps of enabling all charging barrels (2) to inject the melt adhesive into a nozzle (1) according to a set sequence, enabling the nozzle (1) to inject the melt adhesive into a die (14), and enabling the die (14) to form an injection molding piece with gradual change textures.

9. The progressive texture injection molding method of claim 8, wherein a portion of the cartridges are also fed with color from other cartridges.

10. The gradual texture injection method according to claim 8, wherein the injection of the melt adhesive into the nozzle (1) from each cartridge (2) in a set sequence is performed according to the following steps: setting the number of injection molding sections of each charging barrel (2), and injecting the melt adhesive of each injection molding section into the nozzle (1) by each charging barrel (2) according to a set program.

11. A progressive texture injection molding method as claimed in claim 10, characterized in that the program comprises causing each cartridge (2) to simultaneously inject the melt adhesive into the nozzle (1) or alternately to inject the melt adhesive into the nozzle (1).

12. A progressive texture injection molding method as claimed in claim 8, characterized in that, after the nozzle (1) has finished injecting the melt adhesive into the mold, the cartridge initially injected with the melt adhesive is made to inject a certain amount of melt adhesive into the nozzle (1).

13. The gradual texture injection molding method according to claim 8, wherein the injection pressure of the molten rubber injected into the charging barrel (2) is 50-160bar, and the injection speed is 10% -90%.

14. A progressive texture injection molding method as claimed in claim 8, wherein the injection molding material in each barrel (2) contains at least two colorants, each of which is different in color.

15. The progressive texture injection molding method of claim 8, wherein the melting temperature is controlled according to the melting point of the coloring material when the injection molding material is melted at a raised temperature, so that the melting speeds of the coloring materials of different colors are different.

16. A progressive texture injection molded part produced by the injection molding method of any one of claims 8 to 15.

17. The progressive texture injection molding of claim 16, wherein the injection molding has an uneven surface.

18. Use of a graded texture injection molding according to claim 16 or 17 in a household appliance housing.