CN109228010B - Injection molding method of liquid crystal display television shell and product thereof - Google Patents
Injection molding method of liquid crystal display television shell and product thereof Download PDFInfo
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- CN109228010B CN109228010B CN201811192620.4A CN201811192620A CN109228010B CN 109228010 B CN109228010 B CN 109228010B CN 201811192620 A CN201811192620 A CN 201811192620A CN 109228010 B CN109228010 B CN 109228010B
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 52
- 238000001746 injection moulding Methods 0.000 title claims abstract description 47
- 239000000463 material Substances 0.000 claims abstract description 107
- 230000017525 heat dissipation Effects 0.000 claims abstract description 76
- 238000004140 cleaning Methods 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- 238000012545 processing Methods 0.000 claims abstract description 4
- 238000002347 injection Methods 0.000 claims description 42
- 239000007924 injection Substances 0.000 claims description 42
- 239000002245 particle Substances 0.000 claims description 28
- 239000000428 dust Substances 0.000 claims description 23
- 230000003014 reinforcing effect Effects 0.000 claims description 10
- 238000002844 melting Methods 0.000 claims description 7
- 230000008018 melting Effects 0.000 claims description 7
- 238000005452 bending Methods 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 238000007731 hot pressing Methods 0.000 claims description 6
- 238000002791 soaking Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000000243 solution Substances 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 4
- 239000012670 alkaline solution Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 238000011049 filling Methods 0.000 claims description 3
- 239000003292 glue Substances 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 239000002736 nonionic surfactant Substances 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 claims description 2
- 239000002699 waste material Substances 0.000 abstract description 17
- 238000004064 recycling Methods 0.000 abstract description 7
- 230000015556 catabolic process Effects 0.000 abstract description 6
- 238000006731 degradation reaction Methods 0.000 abstract description 6
- 230000008092 positive effect Effects 0.000 abstract description 4
- 238000003912 environmental pollution Methods 0.000 abstract description 3
- 238000000465 moulding Methods 0.000 abstract description 3
- 238000011084 recovery Methods 0.000 abstract description 2
- 238000005457 optimization Methods 0.000 abstract 1
- 239000004743 Polypropylene Substances 0.000 description 59
- 229920005669 high impact polystyrene Polymers 0.000 description 11
- 239000004797 high-impact polystyrene Substances 0.000 description 11
- 239000004793 Polystyrene Substances 0.000 description 9
- 238000013461 design Methods 0.000 description 9
- 230000007547 defect Effects 0.000 description 8
- 230000005855 radiation Effects 0.000 description 7
- 239000000126 substance Substances 0.000 description 5
- 230000006378 damage Effects 0.000 description 4
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical class N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 239000003365 glass fiber Substances 0.000 description 3
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 3
- 229910052753 mercury Inorganic materials 0.000 description 3
- -1 polypropylene Polymers 0.000 description 3
- 229920001155 polypropylene Polymers 0.000 description 3
- 230000002708 enhancing effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 2
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
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- 238000004880 explosion Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
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- 229920000642 polymer Polymers 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B13/00—Conditioning or physical treatment of the material to be shaped
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B13/00—Conditioning or physical treatment of the material to be shaped
- B29B13/06—Conditioning or physical treatment of the material to be shaped by drying
- B29B13/065—Conditioning or physical treatment of the material to be shaped by drying of powder or pellets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/2737—Heating or cooling means therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/78—Measuring, controlling or regulating of temperature
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/64—Constructional details of receivers, e.g. cabinets or dust covers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76494—Controlled parameter
- B29C2945/76531—Temperature
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Liquid Crystal (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses an injection molding method of a liquid crystal display television shell, which is prepared from a PP regenerated material and comprises the following steps of (1) preparing the PP regenerated material, (2) cleaning the PP regenerated material, (3) injecting the PP regenerated material and (4) molding the PP regenerated material. The invention carries out injection molding processing on the waste PP regenerated material, has high working efficiency and low manufacturing cost, and has positive effects and important significance on establishing a resource-saving and environment-friendly society and developing recycling economy; the liquid crystal television shell prepared by the method solves the problem of difficult recovery of the waste backboard and the waste face frame in the waste television through structural optimization and material replacement, reduces the environmental pollution while reducing the consumption of original resources through the rapid degradation performance, and strengthens the strength of the backboard while realizing high heat dissipation through improving the heat dissipation structure of the backboard, thereby having strong practicability.
Description
Technical Field
The invention relates to the technical field of injection molding of television shells, in particular to an injection molding method of a liquid crystal television shell and a product thereof.
Background
With the rapid development of the economy and the improvement of the income level of residents in China, the liquid crystal television has come into thousands of households, and the liquid crystal television also makes China a color television large country in the true sense. The color TV industry is currently also the pillar industry of the electronic industry in China, and the market prospect is good. With the development of the market, televisions of various large-size (40 inches or more), oversized (65 to 75 inches) and oversized (100 inches or more) models are becoming popular with consumers.
At present, the development of the liquid crystal television is mature, and regarding the structural aspect of the liquid crystal television, the main supporting structure of the liquid crystal television in the industry is basically that a back plate made of HIPS material is used as a light-emitting source and a screen is mainly supported, and a face frame made of PS+glass fiber material is used as a support and an aesthetic design of the screen. However, the back plate and the face frame made of HIPS material and PS+glass fiber material have significant defects, and HIP material and PS material contain many harmful substances such as lead, mercury, brominated flame retardant and the like, so that the HIP material and the PS material must be properly treated after scrapping, otherwise, the HIP material and the PS material cause great harm to the environment; meanwhile, the waste backboard and the waste face frame in the waste television which are made of HIPS material and PS+glass fiber material are difficult to recycle, so that the waste backboard and the waste face frame are difficult to degrade rapidly, and the environmental burden and the resource waste are increased. The polypropylene material, namely the PP regenerated material, has good heat resistance, mechanical property and chemical property, low price and excellent degradation property, and is very suitable for manufacturing and producing large-size liquid crystal television shells.
The PP regenerated particle propylene is a non-toxic, odorless and tasteless milky crystalline polymer with high crystallinity and regular structure, so that the PP regenerated particle propylene has excellent mechanical properties, and has higher yield, tensile strength, compressive strength, hardness, elasticity and the like than HDPE. The melting point is 164-170 ℃, the product can be sterilized at the temperature of more than 100 ℃, the chemical stability of polypropylene is good, and the polypropylene can be corroded by concentrated nitric acid and is relatively stable to other various chemical reagents. The common processing method comprises the following steps: injection molding, extrusion molding, hollow molding and rotary molding. However, when injection molding of large-size, complex-structure and thin-wall products is performed, the material has a plurality of problems, and quality problems such as surface defects, internal bubbles and cracks of the products are easily caused.
Meanwhile, the conventional liquid crystal television has the defects in the aspect of heat dissipation, and the conventional liquid crystal television is known by a person skilled in the art to be generally composed of a back plate, a face frame, a display module, an audio module and a main plate, and the display module, the audio module and the main plate can generate heat when in operation, so that if the heat cannot be timely dissipated, the damage of television parts is easily caused, the service life of the liquid crystal television is influenced, and the serious potential safety hazard easily occurs, so that the heat dissipation of the liquid crystal television is particularly important, the heat dissipation of the liquid crystal television is generally carried out in two modes of heat dissipation of the back plate and the addition of heat dissipation components of the parts, the thickness and the manufacturing cost of the liquid crystal television are easily influenced, and therefore, the heat dissipation of the back plate is applied to be less compared with the heat dissipation mode of the back plate, and becomes the main stream of the market.
The prior patent literature discloses a TV louvre structure, patent number: 201520330532.1 the television heat dissipation hole structure specifically comprises: the dustproof baffle rib is arranged on a gap of the radiating hole. The television heat dissipation hole structure disclosed in the patent document has the following defects: firstly, the heat generated by the operation of the liquid crystal television is generally diffused to the periphery, and most of the heat is accumulated at the upper end of the inner cavity of the back plate, so that the heat cannot be efficiently and rapidly dissipated by the heat dissipation holes, and the heat is accumulated in the inner cavity of the television; secondly, the strength of the backboard is reduced by opening the heat dissipation holes, so that the structure of the television backboard is unstable and is easy to damage; thirdly, although the dustproof rib can play a certain dustproof role, a gap exists between the heat dissipation hole and the dustproof rib, and dust still enters into the gap, so that the service life of internal components is endangered.
Therefore, research on the use of PP recycled materials instead of HIPS and PS materials to manufacture large and oversized television housings, avoid product defects, and improve the heat dissipation effect and extend the life of televisions has become urgent.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide an injection molding method of a liquid crystal television shell, which adopts a unique mold and an injection molding process, so that a PP regenerated material can replace HIPS and PS materials to be used for manufacturing television shell products with large size, complex structure and thin wall products, the prior art is simplified, and various product defects in the prior art when the products are manufactured are mainly overcome.
The invention also provides a liquid crystal television shell prepared by implementing the method, and the liquid crystal television shell has the advantages of realizing high heat dissipation, enhancing the strength of the back plate and having strong practicability through the optimized structural design and by improving the heat dissipation structure of the back plate.
By the scheme, the problem that the waste backboard, the waste face frame and the like in the waste television shell product are difficult to recycle is solved, and the environment pollution is reduced while the consumption of the original resources is reduced due to the rapid degradation performance.
The technical scheme provided by the invention for realizing the purposes is as follows:
an injection molding method of a liquid crystal television shell, wherein the liquid crystal television shell is made of PP regenerated material, and comprises the following steps:
(1) Preparing PP regenerated material which is in a granular structure, cleaning the PP regenerated material particles after the preparation, soaking the PP regenerated material particles in a nonionic surfactant solution for 8-15 minutes, then putting the PP regenerated material particles in clean water for cleaning for 8-15 minutes, putting the PP regenerated material particles in an alkaline solution with the pH value of 11-12 for soaking for 8-15 minutes, and finally putting the PP regenerated material particles in the clean water for cleaning for 8-15 minutes to finish the cleaning procedure of the PP regenerated material particles;
(2) Putting the cleaned PP regenerated material particles into a dryer, and drying at 75-85 ℃ to constant weight for 0.5-1 hour;
(3) Preparing a PP regenerated material injection molding machine and a television shell injection mold, and processing the dried PP regenerated material particles by using the PP regenerated material injection molding machine and the television shell injection mold, wherein the television shell injection mold comprises a hot runner system, a cold runner system and a hot pressing system, the hot runner system comprises a plurality of hot runners, the cold runner system comprises a plurality of cold runners, and the hot runner and the cold runner comprise runners and nozzles arranged in the runners:
(4) Filling the dried PP regenerated material into a hopper of a PP regenerated material injection molding machine; setting the temperature of each area of a screw of the PP regenerated material injection molding machine to 220-275 ℃, and connecting a sprue of an injection mold of the television shell with a nozzle of the PP regenerated material injection molding machine;
(5) Preheating a television shell injection mold, wherein the preheating temperature is set to be 40-80 ℃, then introducing high-temperature hot air flow into a hot runner of the television shell injection mold, and operating a hot runner system when the hot runner temperature of the television shell injection mold reaches 220-275 ℃;
(6) Setting a glue melting and injecting process of a PP regenerated material injection molding machine, and injecting PP regenerated material in a hopper of the PP regenerated material injection molding machine into a cavity of an injection mold of a television shell after melting and plasticizing the PP regenerated material in each area of a screw, wherein the injection is carried out according to time section sequences, and the injection pressure is 1500-1800bar;
(7) Introducing high-temperature high-pressure hot air flow into a hot runner of the injection mold of the television shell, regulating a hot pressing system, and introducing cold air flow into a cold runner of the injection mold of the PP regenerated material by using a pressure pump to carry out instantaneous cooling treatment on the mold;
(8) And opening the television shell injection mold to take out the television shell product, and cleaning impurities and drying the hot runner and the cold runner of the television shell injection mold by warm air flow after opening the mold to obtain the television shell product.
Preferably, the preheating temperature is set to 50 ℃.
Preferably, the temperature of each zone of the screw is set at 240 ℃.
The liquid crystal television shell prepared by the method comprises a face frame and a back plate, wherein the face frame and the back plate are made of PP regenerated materials.
The back plate is of a step-shaped structure, the back plate is divided into two parts of the upper part of the back plate and the lower part of the back plate through the bending part, the first radiating part is arranged at the lower end of the upper part of the back plate and positioned at the bending part, the second radiating parts are arranged at the left end and the right end of the middle part of the lower part of the back plate, the third radiating part is arranged at the bottom of the lower part of the back plate, a plurality of reinforcing ribs are arranged in an inner cavity of the back plate, a radiating channel is formed between every two reinforcing ribs, one end opening of the radiating channel is connected with the first radiating part, and the other end opening of the radiating channel is connected with the third radiating part.
The first radiating part and the third radiating part are composed of a radiating through groove and a dustproof rib, the radiating through groove is of a shutter type structure, the dustproof rib is arranged on a gap of the radiating through groove, and the second radiating part is composed of a plurality of radiating through holes.
The first radiating part, the second radiating part and the third radiating part are all provided with dust covers, the dust covers of the first radiating part and the third radiating part are located between the radiating through groove and the dustproof rib, and the dust covers of the second radiating part are located at the inner sides of the radiating through holes.
The first heat dissipation part is of an arc-shaped structure, and the second heat dissipation part is of a circular structure.
The back plate is provided with a plurality of fixing holes, the back plate is fixed with a face frame of the television through the fixing holes, and the back plate is also provided with a plurality of limiting holes.
Compared with the prior art, the method has the following advantages:
1. the method provided by the invention realizes that the PP regenerated material is used for replacing the HIPS material commonly used in the prior art to be used as the material of the television backboard through the improvement of the injection molding process and the mold, and solves the problems that the backboard made of HIPS contains a plurality of harmful substances such as lead, mercury, brominated flame retardant and the like, causes great harm to the environment, and the recycling of the waste backboard is extremely difficult. The PP regenerated material can solve the problem of difficult recovery of the television backboard and the face frame, and the unique rapid degradation performance can greatly reduce the consumption of the original resources, can reduce the environmental pollution, and has positive effects and important significance on establishing a resource-saving and environment-friendly society and developing recycling economy.
2. According to the television shell product, through the improved structure design, particularly through the unique structure design of the first heat dissipation part, the second heat dissipation part and the third heat dissipation part, heat of the inner cavity of the liquid crystal television is diffused from multiple directions, the heat dissipation problem of the liquid crystal television is solved, the heat of the inner cavity of the liquid crystal television is fully dispersed, and the heat dissipation performance is outstanding.
3. The invention not only simplifies the mould and the manufacturing process by adopting the structural design of the product reinforcing ribs, is beneficial to avoiding the injection molding defect of the product, but also strengthens the mechanical strength of products such as the back plate of the television, and the like, and ensures the stability of the back plate while enhancing the heat dissipation performance of the liquid crystal television; meanwhile, a heat dissipation channel is formed between every two reinforcing ribs, the injection molding process can be optimized, and the product pulls heat to the heat dissipation through groove of the heat dissipation part through the heat dissipation channel, so that the heat dissipation speed is increased, and the overall heat dissipation performance of the liquid crystal display television is further improved.
4. According to the invention, by adopting the unique structural design of the dust cover, after the dust is blocked primarily by the dust blocking ribs, the dust cover further prevents dust from entering the liquid crystal television, so that dust can be effectively prevented from accumulating on electronic components in the liquid crystal television, heat of the components cannot be emitted, the original performance of the electronic components is affected, the burning and explosion of the components are effectively avoided, and the safety is improved.
5. The invention can be widely applied to the manufacture of televisions with various large-size (more than 40 inches), oversized (65 to 75 inches) and oversized (100 inches and more) models, improves the performance and quality of products, and simultaneously improves the yield and reduces the manufacturing cost of materials, energy consumption and the like.
In order to more clearly illustrate the structural features and efficacy of the present invention, a detailed description thereof will be given below with reference to the accompanying drawings and examples.
Drawings
FIG. 1 is a schematic illustration of an injection molding process flow of the present invention;
FIG. 2 is a schematic view of the back structure of the back plate main body of the present invention;
FIG. 3 is a schematic view of the inner cavity structure of the back plate body according to the present invention;
FIG. 4 is an exploded view of the bottom structure of the back plate body of the present invention;
fig. 5 is a schematic partial structure of the first heat dissipation portion and the third heat dissipation portion of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1: referring to fig. 1, the injection molding method of the liquid crystal television shell provided by the invention is characterized in that the liquid crystal television shell is made of a PP regenerated material, and comprises the following steps:
(1) Preparing PP regenerated material which is in a granular structure, cleaning the PP regenerated material particles after the preparation, soaking the PP regenerated material particles in a nonionic surfactant solution for 8-15 minutes, then putting the PP regenerated material particles in clean water for cleaning for 8-15 minutes, putting the PP regenerated material particles in an alkaline solution with the pH value of 11-12 for soaking for 8-15 minutes, and finally putting the PP regenerated material particles in the clean water for cleaning for 8-15 minutes to finish the cleaning procedure of the PP regenerated material particles;
(2) Putting the cleaned PP regenerated material particles into a dryer, and drying at 75-85 ℃ to constant weight for 0.5-1 hour;
(3) Preparing a PP regenerated material injection molding machine and a television shell injection mold, and processing the dried PP regenerated material particles by using the PP regenerated material injection molding machine and the television shell injection mold, wherein the television shell injection mold comprises a hot runner system, a cold runner system and a hot pressing system, the hot runner system comprises a plurality of hot runners, the cold runner system comprises a plurality of cold runners, and the hot runner and the cold runner comprise runners and nozzles arranged in the runners:
(4) Filling the dried PP regenerated material into a hopper of a PP regenerated material injection molding machine; setting the temperature of each area of a screw of the PP regenerated material injection molding machine to 220-275 ℃, and connecting a sprue of an injection mold of the television shell with a nozzle of the PP regenerated material injection molding machine;
(5) Preheating a television shell injection mold, wherein the preheating temperature is set to be 40-80 ℃, then introducing high-temperature hot air flow into a hot runner of the television shell injection mold, and operating a hot runner system when the hot runner temperature of the television shell injection mold reaches 220-275 ℃;
(6) Setting a glue melting and injecting process of a PP regenerated material injection molding machine, and injecting PP regenerated material in a hopper of the PP regenerated material injection molding machine into a cavity of an injection mold of a television shell after melting and plasticizing the PP regenerated material in each area of a screw, wherein the injection is carried out according to time section sequences, and the injection pressure is 1500-1800bar;
(7) Introducing high-temperature high-pressure hot air flow into a hot runner of the injection mold of the television shell, regulating a hot pressing system, and introducing cold air flow into a cold runner of the injection mold of the PP regenerated material by using a pressure pump to carry out instantaneous cooling treatment on the mold;
(8) And opening the television shell injection mold to take out the television shell product, and cleaning impurities and drying the hot runner and the cold runner of the television shell injection mold by warm air flow after opening the mold to obtain the television shell product.
As a further improvement of the present invention, it is preferable that the preheating temperature is set to 50 ℃.
As a further improvement of the present invention, it is preferable that the temperature of each zone of the screw is set at 240 ℃.
Referring to fig. 2, 3, 4 and 5, the present invention further provides a liquid crystal television housing manufactured by the above method, where the liquid crystal television housing includes a face frame and a back plate, and the face frame and the back plate are both made of PP regenerated materials; the back plate 1 is of a step-shaped structure, the back plate 1 is divided into two parts of a back plate upper part 3 and a back plate lower part 4 through a bending part 2, a first radiating part 5 is arranged at the lower end of the back plate 3 and is positioned at the bending part 2, second radiating parts 6 are arranged at the left and right ends of the middle part of the back plate lower part 4, a third radiating part 7 is arranged at the bottom of the back plate lower part 4, a plurality of reinforcing ribs 8 are arranged in an inner cavity of the back plate 1, a radiating channel 9 is formed between every two reinforcing ribs 8, one end opening of the radiating channel 9 is connected with the first radiating part 5, and the other end opening of the radiating channel 9 is connected with the third radiating part 7.
In the embodiment, by adopting the structural design of the first heat dissipation part 5, the second heat dissipation part 6 and the third heat dissipation part 7, the heat of the inner cavity of the liquid crystal television is diffused from multiple directions, so that the heat dissipation problem of the liquid crystal television is solved, the heat of the inner cavity of the liquid crystal television is fully dispersed, and the heat dissipation performance is outstanding; meanwhile, through adopting the structural design of the reinforcing ribs 8, the strength of the backboard is enhanced, the heat radiation performance of the liquid crystal display television is enhanced, meanwhile, the stability of the backboard is guaranteed, the heat radiation channel 9 is formed between every two reinforcing ribs 8, and heat is pulled to the heat radiation through groove of the heat radiation part through the heat radiation channel 9, so that the heat radiation speed is accelerated, and the overall heat radiation performance of the liquid crystal display television is further improved.
As a further improvement of the present invention, the first heat dissipation portion 5 and the third heat dissipation portion 7 are both composed of two parts, namely a heat dissipation through groove 10 and a dustproof rib 11, the heat dissipation through groove 10 is in a shutter structure, the dustproof rib 11 is disposed on a gap of the heat dissipation through groove 10, and the second heat dissipation portion 6 is composed of a plurality of heat dissipation through holes.
As a further improvement of the present invention, the first heat dissipation part 5, the second heat dissipation part 6 and the third heat dissipation part 7 are all provided with dust covers, the dust covers of the first heat dissipation part 5 and the third heat dissipation part 7 are located between the heat dissipation through groove 10 and the dust shielding rib 11, and the dust cover of the second heat dissipation part 6 is located at the inner side of the heat dissipation through hole.
In this embodiment, through adopting the structural design of dust cover, after dustproof fender muscle 11 preliminary dust, the dust cover further prevents that the dust from getting into the inside of LCD TV, can accumulate the dust on the inside electronic components of LCD TV effectively to lead to the heat dissipation of components and parts itself not to go out, influence the original performance of electronic components, effectively avoided components to burn out and explode, the security improves.
As a further improvement of the present invention, the first heat dissipation portion 5 has a circular arc structure, and the second heat dissipation portion 6 has a circular structure.
As a further improvement of the invention, the back plate 1 is provided with a plurality of fixing holes, the back plate main body 1 is fixed with the television face frame through the fixing holes, and the back plate 1 is also provided with a plurality of limiting holes.
As a further improvement of the invention, the back plate 1 is made of PP regenerated material.
In the embodiment, the HIPS material is adopted to replace HIPS material commonly used in the prior art as the material of the backboard, because the backboard made of HIPS contains a plurality of harmful substances such as lead, mercury, brominated flame retardant and the like, the environment is greatly harmed, the recycling of the abandoned backboard is extremely difficult, the problem of difficult recycling of the backboard and the face frame can be solved by adopting the PP recycled material, the unique rapid degradation performance can greatly reduce the consumption of primary resources, and simultaneously can also reduce the environmental pollution, and the method has positive effects and important significance on establishing a resource-saving and environment-friendly society and developing recycling economy.
The key points of the invention are as follows: the injection molding method for the liquid crystal television shell is simple in preparation process, HIPS and PS materials are replaced by PP regenerated materials, the recycled PP regenerated materials are recycled, and then the recycled PP regenerated material particles are cleaned and subjected to injection molding, so that the working efficiency is high, the manufacturing cost is low, and the method has positive effects and important significance in establishing a resource-saving and environment-friendly society and developing recycling economy; the liquid crystal television shell prepared by the injection molding method of the liquid crystal television shell solves the problem that the waste backboard and the waste face frame in the waste television are difficult to recycle, reduces the environment pollution while reducing the consumption of original resources by the rapid degradation performance, and strengthens the strength of the backboard while realizing high heat dissipation by improving the heat dissipation structure of the backboard, so that the liquid crystal television shell is high in practicability.
The above description is only of the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any person skilled in the art can make many possible variations and modifications to the technical solution of the present invention or modifications to equivalent embodiments using the methods and technical contents disclosed above, without departing from the scope of the technical solution of the present invention. Therefore, all equivalent changes according to the shape, structure and principle of the present invention are covered in the protection scope of the present invention.
Claims (6)
1. The injection molding method of the liquid crystal television shell is characterized in that the liquid crystal television shell is made of PP regenerated material and comprises the following steps:
(1) Preparing PP regenerated material which is in a granular structure, cleaning the PP regenerated material particles after the preparation, soaking the PP regenerated material particles in a nonionic surfactant solution for 8-15 minutes, then putting the PP regenerated material particles in clean water for cleaning for 8-15 minutes, putting the PP regenerated material particles in an alkaline solution with the pH value of 11-12 for soaking for 8-15 minutes, and finally putting the PP regenerated material particles in the clean water for cleaning for 8-15 minutes to finish the cleaning procedure of the PP regenerated material particles;
(2) Putting the cleaned PP regenerated material particles into a dryer, and drying at 75-85 ℃ to constant weight for 0.5-1 hour;
(3) Preparing a PP regenerated material injection molding machine and a television shell injection mold, and processing the dried PP regenerated material particles by using the PP regenerated material injection molding machine and the television shell injection mold, wherein the television shell injection mold comprises a hot runner system, a cold runner system and a hot pressing system, the hot runner system comprises a plurality of hot runners, the cold runner system comprises a plurality of cold runners, and the hot runners and the cold runners are respectively formed by runners and nozzles arranged in the runners;
(4) Filling the dried PP regenerated material into a hopper of a PP regenerated material injection molding machine; setting the temperature of each area of a screw of the PP regenerated material injection molding machine to 220-275 ℃, and connecting a sprue of an injection mold of the television shell with a nozzle of the PP regenerated material injection molding machine;
(5) Preheating a television shell injection mold, wherein the preheating temperature is set to be 40-80 ℃, then introducing high-temperature hot air flow into a hot runner of the television shell injection mold, and operating a hot runner system when the hot runner temperature of the television shell injection mold reaches 220-275 ℃;
(6) Setting a glue melting and injecting process of a PP regenerated material injection molding machine, and injecting PP regenerated material in a hopper of the PP regenerated material injection molding machine into a cavity of an injection mold of a television shell after melting and plasticizing the PP regenerated material in each area of a screw, wherein the injection is carried out according to time section sequences, and the injection pressure is 1500-1800bar;
(7) Introducing high-temperature high-pressure hot air flow into a hot runner of the injection mold of the television shell, regulating a hot pressing system, and introducing cold air flow into a cold runner of the injection mold of the PP regenerated material by using a pressure pump to carry out instantaneous cooling treatment on the mold;
(8) After the television shell injection mold is opened to take out the television shell product, cleaning impurities and drying the hot runner and the cold runner of the television shell injection mold by warm air flow, so as to finish the whole injection molding process, and the television shell product with the model of extremely large size of 100 inches and above is prepared, so that the product performance and quality are improved, the yield is improved, and the manufacturing cost of materials and energy consumption is reduced;
the liquid crystal television shell comprises a face frame and a back plate, wherein the face frame and the back plate are made of PP regenerated particle materials; the back plate is of a step-shaped structure, the back plate is divided into two parts of the upper part and the lower part of the back plate through a bending part, a first heat dissipation part is arranged at the lower end of the upper part of the back plate and positioned at the bending part, second heat dissipation parts are arranged at the left end and the right end of the middle part of the lower part of the back plate, a third heat dissipation part is arranged at the bottom of the lower part of the back plate, a plurality of reinforcing ribs are arranged in an inner cavity of the back plate, a heat dissipation channel is formed between every two reinforcing ribs, an opening at one end of the heat dissipation channel is connected with the first heat dissipation part, and an opening at the other end of the heat dissipation channel is connected with the third heat dissipation part;
the first radiating part and the third radiating part are composed of a radiating through groove and a dustproof rib, the radiating through groove is of a shutter type structure, the dustproof rib is arranged on a gap of the radiating through groove, and the second radiating part is composed of a plurality of radiating through holes.
2. The injection molding method of a liquid crystal television housing according to claim 1, wherein the preheating temperature is set to 50 ℃.
3. The method of injection molding a liquid crystal television housing according to claim 1, wherein the temperature of each zone of the screw is set to 240 ℃.
4. The injection molding method of the liquid crystal display television shell according to claim 1, wherein the first heat dissipation part, the second heat dissipation part and the third heat dissipation part are respectively provided with a dust cover, the dust covers of the first heat dissipation part and the third heat dissipation part are positioned between the heat dissipation through groove and the dust shielding rib, and the dust cover of the second heat dissipation part is positioned at the inner side of the heat dissipation through hole.
5. The injection molding method of a liquid crystal display television housing according to claim 1, wherein the first heat dissipation portion has a circular arc structure, and the second heat dissipation portion has a circular structure.
6. The injection molding method of the liquid crystal display television shell according to claim 1, wherein the back plate is provided with a plurality of fixing holes, the back plate is fixed with a face frame of the television through the fixing holes, and the back plate is further provided with a plurality of limiting holes.
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| CN201811192620.4A CN109228010B (en) | 2018-10-13 | 2018-10-13 | Injection molding method of liquid crystal display television shell and product thereof |
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| CN201811192620.4A CN109228010B (en) | 2018-10-13 | 2018-10-13 | Injection molding method of liquid crystal display television shell and product thereof |
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