CN112140461A

CN112140461A - High-efficiency energy-saving plastic part injection molding process

Info

Publication number: CN112140461A
Application number: CN202011000107.8A
Authority: CN
Inventors: 不公告发明人
Original assignee: Zhongshan Zeyi Lighting Technology Co ltd
Current assignee: Zhongshan Zeyi Lighting Technology Co ltd
Priority date: 2020-09-22
Filing date: 2020-09-22
Publication date: 2020-12-29

Abstract

The invention discloses an efficient energy-saving plastic part injection molding process, which belongs to the technical field of injection molding, can realize that an embedded coloring rod is vertically embedded into a cavity of an injection mold in advance before injection molding, then the injection molding is carried out on a raw material in a molten state, the release action of a coloring agent of the embedded coloring rod is triggered, a coloring filler in a coloring flower ball starts to melt under the influence of high temperature, an isolation flap is unfolded under the action of elasticity after losing the fixing action, the coloring agent is highly dispersed on the upper surface and the lower surface of the raw material under the action of a coloring ball, and a local stirring action is formed by a dispersion-assisting fiber rod to force the coloring agent to be uniformly distributed on the surface so as to improve the coloring effect, meanwhile, a folded light guide embedded net between the isolation flaps can be unfolded to guide light in a light leakage area, so that the color difference is avoided, and the overlapped isolation flaps can prevent the coloring agent from penetrating into, the use amount of the colorant is greatly reduced, and the molding strength of the plastic part is improved.

Description

High-efficiency energy-saving plastic part injection molding process

Technical Field

The invention relates to the technical field of injection molding, in particular to an efficient energy-saving plastic part injection molding process.

Background

In the manufacturing process of plastic products, the formation of plastic parts is one of the important aspects. The plastic part molding is a process of making various forms (powder, granule, melt and dispersion) of plastics into products or blanks with required shapes. The plastic part is mainly formed by three molding processes of injection molding, extrusion molding and calendaring, and the plastic product is manufactured by the most common injection molding process.

Injection molding is a method in which a material melted by heating is injected into a mold by injection, cooled and solidified to obtain a molded product. The process is carried out by feeding granular or powder plastic into heated charging barrel from hopper of injection machine, heating and plasticizing to molten state, injecting into low-temperature closed mould cavity by nozzle at end of charging barrel, cooling and hardening to keep shape of mould cavity, opening mould and taking out colloid to complete one working period. The molding cycle of injection molding is short (several seconds to several minutes), the mass of a molded product can be several grams to dozens of kilograms, and a molded product with a complex appearance, accurate dimension and metal or nonmetal inserts can be molded at one time. Therefore, the method has strong adaptability and high production efficiency.

The existing plastic part has low strength, and on the other hand, a colorant needs to be mixed in advance during coloring, so that the consumption is high, and the interference on the properties of raw materials is easy to cause, thereby causing the strength reduction of the plastic part.

Disclosure of Invention

1. Technical problem to be solved

Aiming at the problems in the prior art, the invention aims to provide an efficient energy-saving plastic part injection molding process, which can realize that an embedded coloring rod is vertically embedded into a cavity of an injection mold in advance before injection molding, then the injection molding is carried out on a raw material in a molten state, the release action of a coloring agent of the embedded coloring rod is triggered, a coloring filler in a coloring flower ball starts to melt under the influence of high temperature, an isolation flap is unfolded under the action of elasticity after losing the fixing action, the coloring agent is highly dispersed on the upper surface and the lower surface of the raw material under the action of a color assisting ball, a local stirring action is formed by a dispersion assisting fiber rod, the coloring agent is forced to be uniformly distributed on the surface to improve the coloring effect, meanwhile, a folded light guide embedded net between the isolation flaps can be unfolded to guide light in a light leakage area, the occurrence of chromatic aberration is avoided, and the overlapped isolation flaps can prevent the coloring agent from penetrating into the raw material, the use amount of the colorant is greatly reduced, and the molding strength of the plastic part is improved.

2. Technical scheme

In order to solve the above problems, the present invention adopts the following technical solutions.

An efficient energy-saving plastic part injection molding process comprises the following steps:

s1, putting the high-density polyethylene plastic and the polyvinyl chloride plastic into a crusher according to the ratio of 2:1, stirring and crushing to obtain plastic particles;

s2, transferring the obtained plastic particles into a mixer to be continuously heated and mixed for 30-50min to obtain plastic raw materials for subsequent production, and then drying the raw materials;

s3, preparing a corresponding injection mold, prefabricating a matched pre-buried coloring rod according to the thickness of a plastic part, and vertically pre-burying the pre-buried coloring rod in a cavity of the injection mold before injection molding;

s4, putting the raw materials into a charging barrel of a screw extruder, heating and melting the raw materials, injecting the raw materials into a heated injection mold cavity through a hot runner nozzle subjected to heat treatment, and maintaining pressure;

and S5, cooling the injection mold, wherein the molding time is 80-100S, opening the mold, taking out, and trimming to obtain a finished product.

Further, the heating temperature of the mixer in the step S2 is 200-220 ℃, the drying temperature is 160-180 ℃, and the water content of the raw material is kept below 0.3%.

Furthermore, the pre-buried coloring rod comprises a heat insulation fiber rod and coloring flower balls at two ends of the heat insulation fiber rod, each coloring flower ball comprises a plurality of uniformly distributed isolation petals and coloring filling bodies filled in the isolation petals, one end, far away from the heat insulation fiber rod, of each isolation petal is wrapped with a magnetic absorption layer, a pair of adjacent isolation petals is connected with an inwardly folded light guide embedded net, the heat insulation fiber rod can support the coloring flower balls at the two ends and can improve the folding strength of the plastic part, the coloring flower balls can trigger coloring action, the unfolded coloring flower balls can distribute a coloring agent on one hand and can prevent the surface coloring effect from being reduced due to the fact that the coloring agent penetrates into the raw material on the other hand, the tensile strength of the plastic part can be improved, the light guide embedded net can fix and seal the isolation petals by means of the coloring filling bodies and can assist the diffusion of the coloring agent on the surface of the raw material after being unfolded, the magnetic absorption layer provides magnetism, so that the magnetic absorption layer is conveniently vertically embedded in the cavity, and is also conveniently connected with the adjacent isolation flaps after being unfolded, so that the overall leakage-proof effect is improved.

Furthermore, the coloring filling body is a mixture of polyethylene plastic and a coloring agent, the mixing ratio is 10:1, the polyethylene plastic and the raw materials are homologous, and the raw materials cannot be polluted, so that the quality and the strength of the plastic part are reduced.

Furthermore, the isolation lobes are made of magnetic shielding materials, the light guide embedded net is made of light guide materials, the isolation lobes can shield magnetic fields at the upper end and the lower end to avoid mutual interference, and the light guide embedded net can guide light rays to the isolation lobes, so that the colored display effect is improved.

Furthermore, the node of the light guide embedded net is connected with a coloring assisting ball, the coloring assisting ball comprises a hollow reinforced node ball, a scattering assisting fiber rod embedded and connected to the reinforced node ball and a decomposition air release ball connected to the inner end of the scattering assisting fiber rod, the coloring assisting ball can assist in improving the strength of the light guide embedded net, and can trigger a shaking phenomenon to assist in stirring the coloring agent, so that the coloring agent is more uniformly distributed on the surface of the raw material, and the coloring effect of the plastic part is improved.

Furthermore, the reinforced node ball and the dispersion assisting fiber rod are both made of hard heat conducting materials, the decomposition gas release ball is made of materials which decompose into gas when being heated, the reinforced node ball and the dispersion assisting fiber rod can conduct heat to the decomposition gas release ball to trigger the shaking phenomenon, and meanwhile, the heat can be conducted to the coloring filling body to accelerate the melting, so that the process time is shortened, the decomposition gas release ball releases gas after being decomposed when being heated, the dispersion assisting fiber rod is forced to shake at high frequency on the surface of the raw material by the impact force of the gas, and the colorant is assisted to be diffused and distributed.

Furthermore, the injection mold comprises a fixed mold plate and a movable mold plate which are matched, magnetic nodes are embedded and connected to the inner walls of the cavities of the fixed mold plate and the movable mold plate, the magnetic nodes are made of high-temperature-resistant magnetic materials and used for temporarily positioning the embedded coloring rods, the embedded coloring rods are conveniently vertically embedded into the cavities, the coloring agents can be smoothly released to the surfaces of the raw materials, and meanwhile the mechanical strength of the plastic parts is improved.

Further, the length ratio of the heat insulation fiber rods to the coloring flower balls is 3-5:1, the distance between the adjacent heat insulation fiber rods and the diameter of the coloring flower balls are 1-2:1, the heat insulation fiber rods and the coloring flower balls keep a proper length ratio, the strength of a plastic part can be guaranteed, meanwhile, the quality of the plastic part cannot be interfered, the distance of the heat insulation fiber rods can be reasonably controlled to enable the adjacent isolation flaps to form an overlapping area after being unfolded, and the generation of a complete void area is avoided, so that a surface coloring agent leaks into the raw material or the direct irradiation of light causes poor color development effect, color difference and light spots and other phenomena.

Further, the injection pressure in the step S4 is 50 to 110MPa, and the pressure maintaining time is 45 to 60 seconds.

3. Advantageous effects

Compared with the prior art, the invention has the advantages that:

(1) the scheme can realize that the pre-embedded coloring rod is vertically pre-embedded into the cavity of the injection mold in advance before injection molding, then the raw material in a molten state is injected and triggered to release the colorant of the pre-embedded coloring rod, the coloring filler in the coloring flower ball begins to melt under the influence of high temperature, the isolating flap is unfolded under the action of elasticity after losing the fixing function, the colorant is highly dispersed on the upper surface and the lower surface of the raw material under the action of the coloring ball, and the local stirring function is formed by the aid of the dispersion-assisting fiber rods, so that the coloring agent is forced to be uniformly distributed on the surface to improve the coloring effect, meanwhile, the light guide embedded net folded among the isolation lobes can be unfolded to guide light in the light leakage area, so that chromatic aberration is avoided, the overlapped isolating petals can prevent the coloring agent from penetrating into the raw material to prevent dispersion, greatly reduce the using amount of the coloring agent and improve the molding strength of the plastic part.

(2) The pre-buried coloring rod comprises a heat insulation fiber rod and coloring flower balls at two ends of the heat insulation fiber rod, each coloring flower ball comprises a plurality of uniformly distributed isolation petals and coloring filling bodies filled in the isolation petals, one end, far away from the heat insulation fiber rod, of each isolation petal is wrapped with a magnetic absorption layer, a light guide embedded net folded inwards is connected between each two adjacent isolation petals, the heat insulation fiber rod can support the coloring flower balls at the two ends and improve the breaking strength of the plastic part, the coloring flower balls can trigger coloring action, the unfolded coloring flower balls can distribute coloring agents on one hand, on the other hand, the coloring effect can be prevented from being reduced due to the fact that the coloring agents penetrate into the interior of the raw materials, the tensile strength of the plastic part can be improved, the light guide embedded net can fix and seal the isolation petals by means of the coloring filling bodies and can assist the diffusion of the coloring agents on the surface of the raw materials after being unfolded, the magnetic absorption layer provides magnetism, so that the magnetic absorption layer is conveniently vertically embedded in the cavity, and is also conveniently connected with the adjacent isolation flaps after being unfolded, so that the overall leakage-proof effect is improved.

(3) The isolation lobe is made of magnetic shielding materials, the light guide embedded net is made of light guide materials, the isolation lobe can shield magnetic fields at the upper end and the lower end to avoid mutual interference, and the light guide embedded net can guide light rays to the isolation lobe, so that the coloring display effect is improved.

(4) The node of the light guide embedded net is connected with a coloring assisting ball, the coloring assisting ball comprises a hollow reinforced node ball, a scattering assisting fiber rod embedded and connected to the reinforced node ball and a decomposition air release ball connected to the inner end of the scattering assisting fiber rod, the coloring assisting ball not only can assist in improving the strength of the light guide embedded net, but also can trigger the shaking phenomenon to assist in stirring the coloring agent, so that the coloring agent is more uniformly distributed on the surface of the raw material, and the coloring effect of the plastic part is improved.

(5) The reinforced node ball and the dispersion assisting fiber rod are both made of hard heat conducting materials, the decomposition gas release ball is made of materials which decompose gas when being heated, the reinforced node ball and the dispersion assisting fiber rod can conduct heat to the decomposition gas release ball to trigger the shaking phenomenon, meanwhile, the heat can be conducted to the coloring filling body to accelerate the melting, so that the process time is shortened, the decomposition gas release ball releases gas after being decomposed when being heated, the impact force of the gas is utilized to force the dispersion assisting fiber rod to shake at high frequency on the surface of the raw material, and the colorant is assisted to be dispersed and distributed.

(6) Injection mold includes assorted fixed die plate and movable mould board, inlays on fixed die plate and the movable mould board die cavity inner wall and is connected with the magnetism node, and the magnetism node adopts high temperature resistant magnetic material to make, and the magnetism node is used for the temporary to pre-buried coloring rod fix a position, makes things convenient for its vertical pre-buried intracavity of going into, not only can release colorant to the surface of raw materials smoothly, improves the mechanical strength who moulds the piece simultaneously.

(7) The length ratio of the heat insulation fiber rods to the coloring flower balls is 3-5:1, the distance between the adjacent heat insulation fiber rods and the diameter of the coloring flower balls are 1-2:1, the heat insulation fiber rods and the coloring flower balls keep a proper length ratio, the strength of a plastic part can be ensured, the quality of the plastic part cannot be interfered, the distance of the heat insulation fiber rods can be reasonably controlled, the adjacent isolation flaps can form an overlapping area after being unfolded, and the generation of a complete gap area is avoided, so that a surface coloring agent leaks into the raw material or the direct irradiation of light rays causes poor color development effect, color difference and light spots and other phenomena.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the appearance of the pre-buried coloring bar according to the present invention;

FIG. 3 is a schematic structural view of the colored ball of the present invention in a normal state;

FIG. 4 is a schematic structural view of the colored ball of the present invention in an expanded state;

FIG. 5 is a schematic structural diagram of a color-assisted ball according to the present invention.

The reference numbers in the figures illustrate:

the device comprises a fixed template 1, a movable template 2, a pre-embedded coloring rod 3, a heat insulation fiber rod 31, a coloring flower ball 32, a separating lobe 321, a coloring filling body 322, a light guide embedded net 323, a magnetic absorption layer 324, a coloring assisting ball 4, a reinforcing node ball 41, a scattering assisting fiber rod 42 and a explaining balloon 43.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1:

referring to fig. 1, an energy-efficient plastic injection molding process includes the following steps:

s2, placing the obtained plastic particles into a mixer to be continuously heated and mixed for 30min, wherein the heating temperature of the mixer is 200 ℃, mixing the plastic particles into a plastic raw material for subsequent production, drying the raw material at 160 ℃, and keeping the water content of the raw material to be lower than 0.3%;

s3, preparing a corresponding injection mold, prefabricating a matched pre-embedded coloring rod 3 according to the thickness of a plastic part, and vertically pre-embedding the pre-embedded coloring rod 3 in a cavity of the injection mold before injection molding;

s4, putting the raw materials into a charging barrel of a screw extruder, heating and melting the raw materials, injecting the raw materials into a heated injection mold cavity through a hot runner nozzle subjected to heat treatment, and maintaining the pressure, wherein the injection pressure is 50MPa, and the pressure maintaining time is 45S;

and S5, cooling the injection mold, wherein the molding time is 80S, opening the mold, taking out the mold, and then trimming and finishing to obtain a finished product.

Injection mold includes assorted fixed die plate 1 and movable mould board 2, inlays on the 2 die cavity inner walls of fixed die plate 1 and movable mould board and is connected with the magnetism node, and the magnetism node adopts high temperature resistant magnetic material to make, and the magnetism node is used for the temporary to fix a position pre-buried coloring rod 3, makes things convenient for its vertical pre-buried income die cavity, not only can release the surface of colorant to raw materials smoothly, improves the mechanical strength who moulds the piece simultaneously.

Referring to fig. 2-3, the pre-buried coloring rod 3 includes a heat insulation fiber rod 31 and coloring flower balls 32 at two ends of the heat insulation fiber rod 31, the coloring flower balls 32 include a plurality of uniformly distributed isolation flaps 321 and coloring fillers 322 filled in the isolation flaps 321, one end of each isolation flap 321, which is far from the heat insulation fiber rod 31, is wrapped with a magnetic absorption layer 324, and an inwardly folded light guide screen insert 323 is connected between a pair of adjacent isolation flaps 321, the heat insulation fiber rod 31 can not only support the coloring flower balls 32 at two ends, but also can improve the bending strength of the plastic part, the coloring flower balls 32 can trigger coloring action, the unfolded coloring flower balls 32 can distribute the coloring agent, on the one hand, the coloring agent can be prevented from penetrating into the interior of the raw material to cause the reduction of the surface coloring effect, and the tensile strength of the plastic part can be improved, the light guide screen insert not only can fix and seal the isolation flaps 321 by means of the coloring fillers 322, meanwhile, the magnetic attraction layer 324 can assist in the diffusion of the colorant on the surface of the raw material after being unfolded, provides magnetism, facilitates the vertical embedding in the cavity, and meanwhile is convenient to establish connection with the adjacent isolation valve 321 after being unfolded, so that the overall leakage-proof effect is improved.

The coloring filling body 322 adopts a mixture of polyethylene plastic and a coloring agent, the mixing ratio is 10:1, the polyethylene plastic and the raw materials are homologous, the raw materials cannot be polluted, and the quality and the strength of the plastic part are reduced.

The isolation lobes 321 are made of magnetic shielding material, the color is the same as the colorant, the light guide screen 323 is made of light guide material, such as quartz light guide fiber, the isolation lobes 321 can shield the magnetic fields at the upper and lower ends to avoid interference, and the light guide screen 323 can guide the light to the isolation lobes 321, thereby improving the colored display effect.

Referring to fig. 4-5, the coloring assisting ball 4 is connected to a node of the light guide screen 323, the coloring assisting ball 4 includes a hollow reinforced node ball 41, a scattering assisting fiber rod 42 connected to the reinforced node ball 41 in an embedded manner, and a decomposition air release ball 43 connected to an inner end of the scattering assisting fiber rod 42, and the coloring assisting ball 4 not only can assist in improving the strength of the light guide screen 323, but also can trigger a shaking phenomenon to assist in stirring the colorant, so that the colorant is more uniformly distributed on the surface of the raw material, thereby improving the coloring effect of the plastic part.

The reinforced node ball 41 and the dispersion assisting fiber rod 42 are both made of hard heat conducting materials, such as aluminum alloy, the decomposition gas release ball 43 is made of materials which decompose into gas when exposed to heat, such as sodium bicarbonate, the reinforced node ball 41 and the dispersion assisting fiber rod 42 can not only conduct heat to the decomposition gas release ball 43 to trigger the shaking phenomenon, but also conduct heat to the coloring filler 322 to accelerate melting, so that the process time is shortened, the decomposition gas release ball 43 releases gas after being decomposed when exposed to heat, and the dispersion assisting fiber rod 42 is forced to shake on the surface of the raw material at high frequency by the impact force of the gas to assist in diffusing and distributing the coloring agent.

The length ratio of the heat insulation fiber rods 31 to the coloring flower balls 32 is 3-5:1, the distance between the adjacent heat insulation fiber rods 31 and the diameter of the coloring flower balls 32 are 1-2:1, the heat insulation fiber rods 31 and the coloring flower balls 32 keep a proper length ratio, the strength of a plastic part can be ensured, meanwhile, the quality of the plastic part cannot be interfered, the distance of the heat insulation fiber rods 31 can be reasonably controlled to enable the adjacent isolation flaps 321 to form an overlapping area after being unfolded, the generation of a complete gap area is avoided, and therefore surface coloring agents leak into the raw materials or poor color development effect and color difference and light spots and other phenomena are caused by direct irradiation of light.

Example 2:

s2, placing the obtained plastic particles into a mixer to be continuously heated and mixed for 40min, wherein the heating temperature of the mixer is 210 ℃, mixing the plastic particles into a plastic raw material for subsequent production, drying the raw material at 170 ℃, and keeping the water content of the raw material to be lower than 0.3%;

s4, putting the raw materials into a charging barrel of a screw extruder, heating and melting the raw materials, injecting the raw materials into a heated injection mold cavity through a hot runner nozzle subjected to heat treatment, and maintaining the pressure, wherein the injection pressure is 80MPa, and the pressure maintaining time is 50S;

and S5, cooling the injection mold, wherein the molding time is 90S, opening the mold, taking out, and then trimming and finishing to obtain a finished product.

The remainder was in accordance with example 1.

Example 3:

s2, placing the obtained plastic particles into a mixer to be continuously heated and mixed for 50min, wherein the heating temperature of the mixer is 220 ℃, mixing the plastic particles into a plastic raw material for subsequent production, drying the raw material at 180 ℃, and keeping the water content of the raw material to be lower than 0.3%;

s4, putting the raw materials into a charging barrel of a screw extruder, heating and melting the raw materials, injecting the raw materials into a heated injection mold cavity through a hot runner nozzle subjected to heat treatment, and maintaining the pressure, wherein the injection pressure is 110MPa, and the pressure maintaining time is 60S;

and S5, cooling the injection mold, wherein the molding time is 100S, opening the mold, taking out, and then trimming and finishing to obtain a finished product.

The remainder was in accordance with example 1.

The invention can realize that the embedded coloring rod 3 is vertically embedded in the cavity of the injection mold in advance before injection molding, then the raw material in a molten state is injected, the release action of the coloring agent of the embedded coloring rod 3 is triggered, the coloring filler 322 in the coloring flower ball 32 starts to melt under the influence of high temperature, the isolation flaps 321 are unfolded under the action of elasticity after losing the fixing action, the coloring agent is highly dispersed on the upper and lower surfaces of the raw material under the action of the coloring assisting ball 4, and the local stirring action is formed by the dispersing assisting fiber rod 42 to force the coloring agent to be uniformly distributed on the surface so as to improve the coloring effect, meanwhile, the light guide embedded net 323 folded between the isolation flaps 321 is unfolded to guide light in a light leakage area, so that the color difference is avoided, the overlapped isolation flaps 321 can prevent the coloring agent from penetrating into the raw material to prevent dispersion, and greatly reduces the using amount of the coloring agent, the molding strength of the plastic part is improved.

The foregoing is only a preferred embodiment of the present invention; the scope of the invention is not limited thereto. Any person skilled in the art should be able to cover the technical scope of the present invention by equivalent or modified solutions and modifications within the technical scope of the present invention.

Claims

1. An efficient energy-saving plastic part injection molding process is characterized in that: the method comprises the following steps:

s3, preparing a corresponding injection mold, prefabricating a matched pre-buried coloring rod (3) according to the thickness of a plastic part, and vertically pre-burying the pre-buried coloring rod (3) in a cavity of the injection mold before injection molding;

2. The high-efficiency energy-saving plastic part injection molding process according to claim 1, characterized in that: the heating temperature of the mixer in the step S2 is 200-220 ℃, the drying temperature is 160-180 ℃, and the water content of the raw material is kept to be lower than 0.3%.

3. The high-efficiency energy-saving plastic part injection molding process according to claim 1, characterized in that: the embedded coloring rod (3) comprises a heat insulation fiber rod (31) and coloring flower balls (32) at two ends of the heat insulation fiber rod (31), each coloring flower ball (32) comprises a plurality of uniformly distributed isolation lobes (321) and coloring filling bodies (322) filled in the isolation lobes (321), one end, far away from the heat insulation fiber rod (31), of each isolation lobe (321) is wrapped with a magnetic absorption layer (324), and a pair of adjacent isolation lobes (321) are connected with a light guide embedded net (323) folded inwards.

4. The high-efficiency energy-saving plastic part injection molding process according to claim 3, characterized in that: the coloring filling body (322) adopts a mixture of polyethylene plastics and a coloring agent, and the mixing ratio is 10: 1.

5. The high-efficiency energy-saving plastic part injection molding process according to claim 2, characterized in that: the isolation lobes (321) are made of magnetic shielding materials, and the light guide embedded net (323) is made of light guide materials.

6. The high-efficiency energy-saving plastic part injection molding process according to claim 3, characterized in that: and the node of the light guide embedded net (323) is connected with a coloring assisting ball (4), and the coloring assisting ball (4) comprises a hollow reinforced node ball (41), a scattering assisting fiber rod (42) embedded and connected to the reinforced node ball (41), and a sub-explaining balloon (43) connected to the inner end of the scattering assisting fiber rod (42).

7. The high-efficiency energy-saving plastic part injection molding process according to claim 6, characterized in that: the reinforced node ball (41) and the dispersion-assisting fiber rod (42) are both made of hard heat conducting materials, and the explaining balloon (43) is made of substances which decompose to generate gas when being heated.

8. The high-efficiency energy-saving plastic part injection molding process according to claim 1, characterized in that: the injection mold comprises a fixed mold plate (1) and a movable mold plate (2) which are matched, magnetic nodes are embedded and connected on the inner walls of cavities of the fixed mold plate (1) and the movable mold plate (2), and the magnetic nodes are made of high-temperature-resistant magnetic materials.

9. The high-efficiency energy-saving plastic part injection molding process according to claim 3, characterized in that: the length ratio of the heat insulation fiber rods (31) to the coloring flower balls (32) is 3-5:1, and the distance between the adjacent heat insulation fiber rods (31) and the diameter of the coloring flower balls (32) are 1-2: 1.

10. The high-efficiency energy-saving plastic part injection molding process according to claim 1, characterized in that: the injection pressure in the step S4 is 50-110MPa, and the pressure maintaining time is 45-60S.