CN112976480A

CN112976480A - Method for manufacturing color-gradient material, injection molding machine and color-gradient material

Info

Publication number: CN112976480A
Application number: CN202110192699.6A
Authority: CN
Inventors: 陈炽辉; 张莹; 杨均才; 陈锋; 蔡佳俊
Original assignee: Guangdong Yizumi Precision Machinery Co Ltd
Current assignee: Guangdong Yizumi Precision Machinery Co Ltd
Priority date: 2021-01-28
Filing date: 2021-02-20
Publication date: 2021-06-18

Abstract

The invention provides a method for manufacturing a color gradient material, an injection molding machine and the color gradient material, wherein the method comprises the steps that the injection molding machine is matched to form a mold cavity; injecting raw materials and color paste into the die cavity; wherein the input amount of the color paste is gradually increased or gradually decreased based on the time gradient, and/or the color paste has a metal flake pigment; and opening the mold and ejecting the material by the injection molding machine. The material with gradually changed color manufactured by the method and the injection molding machine has gradually changed effect from inside to outside, and the condition that the color of the surface is inconsistent with the color of the inside after the surface is abraded can not occur. The method for manufacturing the color-gradient material can mold the color-gradient material at one time, greatly simplifies the production flow and improves the production efficiency.

Description

Method for manufacturing color-gradient material, injection molding machine and color-gradient material

Technical Field

The invention relates to the technical field of injection molding equipment, in particular to a method for manufacturing a material with gradually changed color, an injection molding machine and the material with gradually changed color.

Background

Polyurethane is used as an intelligent material, has the characteristics of softness, hardness, wear resistance, scratch resistance, self-repair and the like, has the advantages of free color matching, adjustable transparency, bright color and the like, is friendly to an intelligent insert, and is applied to the preparation of interior parts of automobiles, accessories of intelligent household appliances and accessories of mobile phones, and the use amount of the polyurethane tends to increase year by year.

With the increasing appearance requirements of people on polyurethane products, some polyurethane products with gradually changed surface colors appear in the market, and at present, the surface of the polyurethane product has the gradually changed color effect mainly by spraying a coloring agent on the polyurethane product. In addition, the color-changing fabric and the manufacturing method of the color-changing fabric disclosed in chinese patent application CN201711484577.4 can be manufactured by spraying a colorant on a mold in advance, in which a release film is coated on the inner surface of the mold and a colorant with a changing effect is sprayed, then the mold is closed to perform polyurethane injection, and after the polyurethane is molded, the colorant sprayed in advance is attached to the surface of the polyurethane product to form the changing effect. The existing method for manufacturing the gradient polyurethane product has the disadvantages of complicated steps and low production efficiency.

Disclosure of Invention

The invention aims to provide a method for manufacturing a material with a gradually-changed color, an injection molding machine and the material with the gradually-changed color.

The technical scheme of the invention is realized as follows:

a method of making a color gradient material comprising the steps of:

step S1: closing the mold by an injection molding machine to form a mold cavity;

step S2: injecting raw materials and color paste into the die cavity; wherein the input amount of the color paste is gradually increased or gradually decreased based on the time gradient, or the input amount of the color paste is kept constant based on the time gradient when the color paste has the metal flake pigment;

step S3: and opening the mold and ejecting the material by the injection molding machine.

The method for manufacturing the material with the color gradient obtains the material with the color gradient effect by adding the color paste in a decreasing or increasing way in the material forming process or adding the metal flake pigment into the color paste. The material with gradually changed color manufactured by the method has gradually changed effect from inside to outside, and the condition that the color of the surface is inconsistent with that of the inside after the surface is abraded is avoided. The method for manufacturing the color-gradient material can mold the color-gradient material at one time, greatly simplifies the production flow and improves the production efficiency.

Further, in the step S2, the input amount of the color paste ranges from 1g/S to 15 g/S.

Further, in step S2, the injection time of injecting the raw material and the color paste into the mold cavity is 1S-10S, and the time gradient is 0.1-0.5S.

Further, the color paste also comprises spherical particle pigment.

The invention also provides an injection molding machine for manufacturing the material with gradually changed color, which comprises: the device comprises a fixed plate, a movable plate, a first fixed die, a movable die and a first glue injection machine communicated with the first fixed die;

the first glue injection machine comprises a mixing component, a feeding pipe and a color injection pipe, wherein the feeding pipe is communicated with the mixing component, and the color injection pipe is used for injecting color paste into the mixing part;

the flow valve is arranged in the color injection pipe and used for moving along the color injection pipe based on time gradient in the injection process or staying in the color injection pipe in the injection process.

Optionally, the flow valve has a first working position and a second working position, and the input amounts of color paste corresponding to the two positions are different;

when the flow valve gradually moves from the first working position to the second working position, the input amount of the color paste injected into the mixing part by the color injection pipe is gradually reduced, and when the flow valve gradually moves from the second working position to the first working position, the input amount of the color paste injected into the mixing part by the color injection pipe is gradually increased.

Optionally, the flow valve has a third operating position, and when the color paste has the metal flake pigment, the flow valve stays at the third operating position, so that the input amount of the color paste is constant.

Further, the color injection tube is provided with a sleeve, a cavity is formed in the sleeve, a nozzle is arranged at the end part of the cavity, and a color paste injection port is formed in the side surface of the cavity;

the flow valve sets up in the cavity, the front end of flow valve is the toper and just right the nozzle, the rear end and the piston rod of flow valve are connected.

Preferably, the injection molding machine comprises two movable dies, and further comprises a second fixed die, a second glue injector communicated with the second fixed die and a turntable, wherein the turntable is arranged on the movable plate and moves along with the movable plate;

the two movable moulds are arranged on the turntable, and the two movable moulds rotate along with the turntable to exchange positions.

The invention also provides a material with gradually changed color, which is manufactured by the method for manufacturing the material with gradually changed color.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

FIG. 1 is a perspective view of an injection molding machine for making a material with a gradually changing color according to the present invention;

FIG. 2 is a cross-sectional view of the color fill tube of the present invention;

FIG. 3 is a schematic view of a first mold closing of the injection molding machine for making color-changing material according to the present invention;

FIG. 4 is a schematic diagram of a second mold closing of the injection molding machine for manufacturing color-gradient materials according to the present invention.

The automatic color paste injection device comprises a fixed plate 1, a fixed plate 2, a movable plate 3, a first fixed die 4, a first movable die 5, a first glue injector 6, a second fixed die 7, a second movable die 8, a second glue injector 21, a rotary table 51, a mixing component 52a, feed pipes A and 52B, feed pipes B and 53, color injection pipes 531, flow valves, 532, sleeves 533, a cavity 534, nozzles 535, a color paste injection port 536 and a piston rod.

Detailed Description

The technical solution provided by the present invention is explained in more detail with reference to fig. 1 to 4.

Example 1

The invention relates to a method for manufacturing a color-gradient material, which comprises the following steps:

step S2: injecting raw materials and color paste into the die cavity; wherein the input amount of the color paste is gradually increased or gradually decreased based on the time gradient;

The invention adopts the method to prepare the material with the color gradient, and the material with the color gradient effect is obtained by adding the color paste in a decreasing or increasing way in the injection process. By adopting the integrated molding mode, the production flow is greatly simplified, and the production efficiency is improved. Because the color paste is added to the material in the material forming process, the color-gradually-changed material has a gradually-changed effect from inside to outside, and the condition that the surface is inconsistent with the color inside after the surface is worn can not occur.

Preferably, the flow range of the color paste is 1g/s-15 g/s.

The injection time for injecting the raw materials and the color paste into the mold cavity is 1s-10s, and the time gradient is 0.1s-0.5 s.

Example 2

step S2: injecting raw materials and color paste into the die cavity; wherein the color paste has a metallic flake pigment;

Preferably, the mill base comprises spherical particle pigments. Because the spherical particle pigment and the metal flake pigment are added to the material in the material forming process, the positions and the angles of the spherical particle pigment and the metal flake pigment distributed on the material are different, and the spherical particle pigment and the metal flake pigment at different angles have different refractive indexes and absorption coefficients, the flash effect and the gradient color effect of light and shade change can be realized at different visual angles.

Specifically, the color paste in the embodiment is formed by adding a solvent dispersant and the like into the spherical particle pigment and the metal flake pigment according to a certain proportion and uniformly mixing.

In the process of manufacturing the color-graded material, a color paste containing spherical particle pigments and metal flake pigments may be mixed with the raw materials in step S0.

Or different feeding pipes can be used to inject the raw materials and the color paste containing the spherical particle pigment and the metal flake pigment at the same time in the step S1, and the raw materials and the color paste are uniformly mixed in a mixing part of an injection molding machine and then injected into a mold cavity, wherein the input amount of the color paste in the embodiment can be changed along with time and can also be kept at a constant speed.

Example 3

This example provides an injection molding machine suitable for use in the methods of making color-graded materials of examples 1 and 2. As shown in fig. 1, the injection molding machine includes: the device comprises a fixed plate 1, a movable plate 2, a first fixed die 3, a movable die and a first glue injection machine 5 communicated with the first fixed die 3;

the first glue injector 5 comprises a mixing component 51, a feeding pipe communicated with the mixing component 51 and a color injection pipe 53, wherein the color injection pipe 53 is used for injecting color paste into the mixing part;

the flow valve 531 is arranged in the color injection pipe 53, when the first working position of the flow valve 531 gradually moves to the second working position, the input amount of the color paste injected into the mixing part by the color injection pipe 53 gradually decreases, and when the flow valve 531 gradually moves to the first working position at the second working position, the input amount of the color paste injected into the mixing part by the color injection pipe 53 gradually increases.

According to the injection molding machine, the mixing component 51 and the color injection pipe 53 with the flow valve 531 are arranged, the flow valve 531 moves back and forth between the first working position and the second working position in the working process of the injection molding machine, so that the flow of color paste injected into the mixing part by the color injection pipe 53 is gradually increased or gradually reduced, the color paste and raw materials injected from the feeding pipe are mixed and then enter a mold cavity formed by the first fixed mold 3 and the movable mold, and materials with gradual change effects are formed. The injection molding machine disclosed by the invention can be used for molding materials with a gradual change effect at one time, so that the production flow is greatly simplified, and the production efficiency is improved.

Specifically, as shown in fig. 2, the color injection tube 53 has a sleeve 532, a cavity 533 is provided in the sleeve 532, a nozzle 534 is opened at an end of the cavity 533, and a color paste injection port 535 is opened at a side surface of the cavity 533; the flow valve 531 is disposed in the cavity 533, a front end of the flow valve 531 is tapered and faces the nozzle 534, and a rear end of the flow valve 531 is connected to the piston rod 536.

In the injection process, the position of the flow valve 531 closest to the nozzle 534 is a second working position, and the input amount of the color paste is the minimum at the moment; the position of the flow valve 531 farthest from the nozzle 534 is a first working position, and the input amount of the color paste is the largest at this time. The operator can set the stroke of the piston rod 536, i.e., the specific positions of the first and second working positions, according to the input amount of the color paste.

It should be noted that, the user can adjust the moving speed of the piston rod 536 according to the need, and the larger the moving speed of the piston rod is, the faster the flow rate of the color paste changes.

The piston rod 536 is preferably a rotary piston rod, one end of the piston rod 536 remote from the flow valve 531 is connected to a motor, and the piston rod 536 is driven by the motor to move axially along the sleeve 532 to move the flow valve 531 away from or close to the nozzle 534. The front end of the flow valve 531 is conical, when the flow valve 531 gradually moves from the second working position to the first working position, the gap between the flow valve 531 and the nozzle 534 is increased, and the flow rate of the color paste ejected from the nozzle 534 is increased; when the flow valve 531 is gradually moved from the first operating position to the second operating position, the gap between the flow valve 531 and the nozzle 534 is decreased, and the flow rate of the color paste discharged from the nozzle 534 is decreased, so that the flow rate of the color paste discharged from the nozzle 534 is increased or decreased with time.

Wherein the piston rod 536 is in sealing fit with the inner wall of the sleeve 532, and the end of the piston rod 536 and the nozzle 534 define the cavity 533 in the inner space of the sleeve 532.

As a preferable scheme, the injection molding machine comprises two movable dies, and further comprises a second fixed die 6, a second glue injector 8 communicated with the second fixed die 6 and a turntable 21, wherein the turntable 21 is arranged on the movable plate 2 and moves along with the movable plate 2; the two movable dies are arranged on the turntable 21, and the two movable dies rotate along with the turntable 21 to perform position exchange.

For the sake of distinction, the two movable dies in the present embodiment are the first movable die 4 and the second movable die 7, respectively.

In this embodiment, the first glue injection machine is used for injecting a polyurethane raw material, and the second glue injection machine is used for injecting an injection molding raw material. The first glue injection machine comprises two feeding pipes, namely a feeding pipe A and a feeding pipe B, and the two feeding pipes are used for injecting two-component raw materials into the mixing component 51.

As shown in fig. 3, the injection molding machine is closed for the first time, and the second injection molding machine 8 injects the injection molding material into the cavity formed by the second fixed mold 6 and the second movable mold 7 to form an injection molding semi-finished product a. Then the mold is opened and the turntable 21 is rotated, as shown in fig. 4, so that the second movable mold 7 faces the first fixed mold 3, the first movable mold 4 faces the second fixed mold 6, and the mold closing is performed for the second time. The second glue injection machine 8 injects the injection molding material into a mold cavity formed by the second fixed mold 6 and the first movable mold 4 to form a semi-finished product b; the first rubber injection machine 5 injects polyurethane into a mold cavity formed by the first fixed mold 3 and the second movable mold 7, and forms a PU layer forming finished product on the injection molding semi-finished product a. The mold is then opened and the finished product is removed by automated equipment and the steps described above are repeated.

By adopting the structure, the first movable die 4 and the second movable die 7 are converted by the movable plate 2 of the turntable 21, so that the processes of firstly injecting a semi-finished product and then coating a PU layer on the same equipment are realized, the production process is simplified, and the production efficiency is improved.

Example 4

This example provides an injection molding machine suitable for use in the method of making a color-graded material of example 2. The technical solution of this embodiment is substantially the same as that of embodiment 3, and the main difference is that the flow valve of the injection molding machine of this embodiment has a third operating position, and when the color paste has the metal flake pigment, the flow valve stays at the third operating position, so that the input amount of the color paste is constant.

The operator can set the pushed amount of the piston rod 536, i.e. the specific position of the third working position according to the input amount of color paste, and the piston rod 536 does not move during the injection process, and the input amount of the color paste is kept constant.

Example 5

This example provides a color gradient material, which is manufactured by the method for manufacturing a color gradient material according to example 1 or example 2. The shape of the material is not limited, the shape of the material is determined by the shape of a mold cavity of the injection molding machine, the injection molding machine can be used for manufacturing flat plate materials, and different products can be manufactured by matching with processes such as later cutting and the like; the final product, such as mobile phone shells and the like, household appliance accessories, automobile interior accessories and the like can also be directly formed by designing the shape of the cavity.

In the description of the present invention, it is to be understood that the terms "vertical", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the scope of the present invention.

If the terms "first," "second," etc. are used herein to define parts, those skilled in the art will recognize that: the use of "first" and "second" is merely for convenience in describing the invention and to simplify the description, and the words are not intended to have a special meaning unless otherwise stated.

The present invention is not limited to the embodiments, and various modifications and variations of the present invention are intended to be included within the scope of the claims and the equivalent technical scope of the present invention if they do not depart from the spirit and scope of the present invention.

Claims

1. A method of making a color gradient material comprising the steps of:

2. The method of making a color gradient material of claim 1, wherein:

in the step S2, the input amount of the color paste ranges from 1g/S to 15 g/S.

3. The method of making a color gradient material of claim 2, wherein:

in step S2, the injection time of injecting the raw materials and the color paste into the mold cavity is 1S-10S, and the time gradient is 0.1S-0.5S.

4. The method of making a color gradient material of claim 1, wherein:

the color paste also comprises spherical particle pigment.

5. An injection molding machine for carrying out the method of making a color gradient material of claim 1, comprising: the device comprises a fixed plate, a movable plate, a first fixed die, a movable die and a first glue injection machine communicated with the first fixed die;

6. An injection molding machine according to claim 5, wherein:

the flow valve is provided with a first working position and a second working position, and the input amount of color paste corresponding to the two positions is different;

7. An injection molding machine according to claim 5, wherein:

the flow valve is provided with a third working position, and when the color paste contains the metal flake pigment, the flow valve is kept at the third working position so as to ensure that the input quantity of the color paste is constant.

8. An injection molding machine according to claim 5, wherein:

the color injection tube is provided with a sleeve, a cavity is arranged in the sleeve, the end part of the cavity is provided with a nozzle, and the side surface of the cavity is provided with a color paste injection port;

9. An injection molding machine according to any one of claims 5-8, wherein:

the injection molding machine comprises two movable dies, a second fixed die, a second glue jetting machine communicated with the second fixed die and a turntable, wherein the turntable is arranged on the movable plate and moves along with the movable plate;

10. A color gradient material characterized by: the color-gradient material is manufactured by the method for manufacturing the color-gradient material according to any one of claims 1 to 4.