CN106113428A - A kind of Shooting Technique of PP LGF30 material fronts module - Google Patents
A kind of Shooting Technique of PP LGF30 material fronts module Download PDFInfo
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- CN106113428A CN106113428A CN201610464884.5A CN201610464884A CN106113428A CN 106113428 A CN106113428 A CN 106113428A CN 201610464884 A CN201610464884 A CN 201610464884A CN 106113428 A CN106113428 A CN 106113428A
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- Prior art keywords
- injection
- lgf30
- module
- shooting technique
- heated
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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
- 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
- B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material
-
- 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
-
- 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
- B29C2945/76498—Pressure
-
- 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
- B29C2945/76595—Velocity
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The Shooting Technique of a kind of PP LGF30 material fronts module of the present invention, belongs to injection molding art, and its step is as follows: step one, pretreatment of raw material;Step 2, equipment pretreatment;Step 3, plasticizing;Step 4, injection;Step 5, pressurize;Step 6, cooling molding;Step 7, the demoulding, the Shooting Technique step of front-end module is simple, the cycle is short to use technical scheme to make, and front-end module Forming Quality is excellent.
Description
Technical field
The present invention relates to injection molding art, more particularly, it relates to the Shooting Technique of a kind of PP-LGF30 material fronts module.
Background technology
Injection is a kind of method that industrial products produce moulding, and product generally uses rubber injection mold and plastic injection.Injection
Also can dispensing molding die platen press and casting die.Injection (mo(u)lding) machine (be called for short injector or injection machine) be by thermoplastic or
Thermosetting material utilizes mould for plastics to make the main former of variously-shaped plastic, and injection moulding is by note
Molding machine and mould realize.
Front-end bracket, as a part for vehicle body, typically uses welded-steel plate construction.Along with plastic material and processing work thereof
The continuous progress of skill, MULTILAYER COMPOSITE plate technique, glass mat technology, long fibre mould pressing technology and long fiber injection technology etc. are all
Successively it is widely used in manufacturing front-end bracket.At present, increasing front-end bracket have employed all-plastic structure, this structure
Take full advantage of the performance advantage of plastics, it is possible to used to make the best and ingenious integrated, it is achieved the optimization of function and cost and weight
Minimumization of amount.Up to now, existing diversified plastic construction front-end bracket is developed.
But existing front-end bracket Shooting Technique there is also certain defect in implementation process, as processing step is multiple
Miscellaneous, cycle length and high in cost of production defect, the end product quality of the most existing technique is the highest, it is difficult to meet the making requirement of people.
Through retrieval, China Patent No.: 2010102912441 applyings date: on JIUYUE 25th, 2010, invention and created name is:
Planting PPO plastics air-conditioner housing Shooting Technique, this application case relates to a kind of PPO plastics air-conditioner housing Shooting Technique, this technique
Comprise the steps: (1) pretreatment of raw material;(2) adapted to injection system and injection mold pretreatment;(3) plasticizing;(4) injection;(5) protect
Pressure;(6) cooling molding;(7) demoulding.This process implementing step is simple, effectively reduces molding cycle and production cost, simultaneously
By corresponding process conditions, be effectively improved the end product quality of this technique, but this application case cannot be suitable for front-end bracket
Injection mo(u)lding.
Summary of the invention
1. invention to solve the technical problem that
It is an object of the invention to overcome front-end bracket Shooting Technique step complexity, cycle length and high in cost of production in prior art
Defect, the deficiency of the problem such as the end product quality of the most existing technique is the highest, it is provided that the note of a kind of PP-LGF30 material fronts module
Moulding technique, the Shooting Technique step of front-end module is simple, the cycle is short to use technical scheme to make, and front-end module becomes
Type is superior in quality.
2. technical scheme
For reaching above-mentioned purpose, the technical scheme that the present invention provides is:
A kind of Shooting Technique of the PP-LGF30 material fronts module of the present invention, its step is as follows:
Step one, pretreatment of raw material: utilize baking oven that PP-LGF30 material uses the temperature of 75 ~ 85 DEG C carry out 4 hours being dried place
Reason;
Step 2, equipment pretreatment: the barrel of injection machine is heated to 220 ~ 270 DEG C, and injector screw rod is heated;Will
In injection mold, hot flow path is heated to 265 ~ 275 DEG C, and dynamic model temperature in injection mold is heated to 45 ~ 50 DEG C, and cover half temperature adds
Heat is to 50 ~ 55 DEG C;
Step 3, plasticizing: the PP-LGF30 material after drying in step one is put in the injecting machine material tube in step 2 and profit
PP-LGF30 material after drying with the screw in injection molding machine in step 2 is heated to molten condition;
Step 4, injection: the PP-LGF30 material of molten condition in step 3 is molded into by screw in injection molding machine and nozzle and adds
In the die cavity formed after the dynamic model of heat and cover half matched moulds;
Step 5, pressurize: carry out pressurize by uniformly injection;
Step 6, cooling molding: the time of cooling molding is 80s;
Step 7, the demoulding: after product cooling, ejected by mould machine and carry out front-end module product stripping.
As the present invention further, in step 2, the heating-up temperature of injector screw rod is 260 ~ 280 DEG C.
As the present invention further, in step 2, in injection mold, hot flow path is divided into 15 groups, and 15 groups are both heated to 265
~275℃。
As the present invention further, in step 4, injection was divided into for three stages:
The injection pressure of first stage is 120 ~ 130bar, and injection moulding speed is 50 ~ 60% maximal raties;The injection pressure of second stage
Power is 100 ~ 110bar, and injection moulding speed is 35 ~ 45% maximal raties;The injection pressure of phase III is 50 ~ 60bar, injection moulding speed
It is 15 ~ 25% maximal raties.
As the present invention further, in step 4, injection time is 15 ~ 17s, and injection terminal is 38 ~ 40 mm.
As the present invention further, in step 5, the dwell time is 9 ~ 11s.
As the present invention further, the metering stroke producing front-end module is 400mm.
3. beneficial effect
Use the technical scheme that the present invention provides, compared with prior art, there is following remarkable result:
(1) Shooting Technique of a kind of PP-LGF30 material fronts module of the present invention, is wherein molded and was divided into for three stages: the first stage
Injection pressure be 120 ~ 130bar, injection moulding speed is 50 ~ 60% maximal raties, screw rod when described maximal rate is pointed injection (or
Plunger) maximal rate of movement;The injection pressure of second stage is 100 ~ 110bar, and injection moulding speed is 35 ~ 45% maximal raties,
The maximal rate of screw rod (or plunger) movement when described maximal rate is pointed injection;The injection pressure of phase III is 50 ~
60bar, injection moulding speed is 15 ~ 25% maximal raties, the maximum speed of screw rod (or plunger) movement when described maximal rate is pointed injection
Degree;The present invention by the injection pressure of first stage, the reasonable setting of injection moulding speed, can efficiently control product internal stress,
Cold burden head, the most also fully can discharge the gas in mould, it is to avoid injecting products is caused the phenomenon of shrinkage cavity, pore by gas;
The injection pressure of second stage, the reasonable setting of injection moulding speed so that melted PP-LGF30 material be sufficiently packed into dynamic model with
In the die cavity formed after cover half matched moulds, reach the demand of the size of front-end module product, thickness so that front-end module product is good
Good molding;The injection pressure of phase III, the reasonable setting of injection moulding speed so that front-end module product is in final forming process
The burr of middle control product, improve the surface smoothness of product.
(2) Shooting Technique of a kind of PP-LGF30 material fronts module of the present invention, wherein, in pressurize the dwell time be 9 ~
11s, the present invention uses the rational dwell time, on the one hand avoids the dwell time longer, causes melt in die cavity to solidify,
And inflow entrance not yet freezes the phenomenon of envelope;On the other hand avoid the dwell time not enough, cause the density of product and size not to meet
The phenomenon required.
Detailed description of the invention
For further appreciating that present disclosure, below in conjunction with embodiment, the present invention is described in detail.
Embodiment 1
A kind of Shooting Technique of the PP-LGF30 material fronts module of the present embodiment, its step is as follows:
Step one, pretreatment of raw material: utilize baking oven that PP-LGF30 material uses the temperature of 75 ~ 85 DEG C carry out 4 hours being dried place
Reason.
Step 2, equipment pretreatment: the barrel of injection machine is heated to 220 ~ 270 DEG C, and injector screw rod is added
Heat, the heating-up temperature of injector screw rod is 260 ~ 280 DEG C;Hot flow path in injection mold is heated to 265 ~ 275 DEG C, by injection mould
In tool, dynamic model temperature is heated to 45 ~ 50 DEG C, and cover half temperature is heated to 50 ~ 55 DEG C, and in injection moulding process, cover half temperature is higher than dynamic model temperature
The temperature of degree.
Specifically in the present embodiment, the barrel of injection machine is heated to 220 DEG C, and dynamic model temperature in injection mold is heated to 50
DEG C, cover half temperature is heated to 55 DEG C, and in the present embodiment, in injection moulding process, cover half temperature is higher than the temperature of dynamic model temperature, Ke Yiyou
Make to effect injecting products depart from the die cavity of cover half smoothly, and then effectively reduce the demoulding time of injecting products;By in injection mold
In hot runner plastic injection mould, hot flow path is divided into 15 groups, and 15 groups of hot flow paths all heat.
15 groups of hot flow paths are heated separately to corresponding temperature (temperature difference ± 5 DEG C) as follows:
1、270℃;2、270℃;3、270℃;4、270℃;5、270℃;6、270℃;7、270℃;8、270℃;9、270℃;
10、270℃;11、270℃;12、270℃;13、270℃;14、270℃;15、270℃.
By 15 groups of hot flow paths, the present embodiment ensures that the melted PP-LGF30 material injecting in mould is in melted all the time
State, the die cavity that melted PP-LGF30 material can be made to be formed after being sufficiently packed into dynamic model and cover half matched moulds is interior to meet step
The demand of injection in four, improves the quality of injecting products.
Step 3, plasticizing: the PP-LGF30 material after drying in step one is put in the injecting machine material tube in step 2
And the PP-LGF30 material after utilizing the screw in injection molding machine in step 2 to dry is heated to molten condition.
Step 4, injection: the PP-LGF30 material of molten condition in step 3 is molded by screw in injection molding machine and nozzle
In the die cavity formed after the dynamic model and cover half matched moulds of heating;In step 4, injection time is 15 ~ 17s, and injection terminal is 38 ~ 40
Mm, the metering stroke of the front-end module producing the PP-LGF30 material of the present embodiment is 400mm.
Wherein, in step 4, injection was divided into for three stages:
The injection pressure of first stage is 120 ~ 130bar, and injection moulding speed is 50 ~ 60% maximal raties, and described maximal rate refers to
The maximal rate of screw rod (or plunger) movement during injection;
The injection pressure of second stage is 100 ~ 110bar, and injection moulding speed is 35 ~ 45% maximal raties, and described maximal rate refers to
The maximal rate of screw rod (or plunger) movement during injection;
The injection pressure of phase III is 50 ~ 60bar, and injection moulding speed is 15 ~ 25% maximal raties, and described maximal rate refers to note
The maximal rate of screw rod (or plunger) movement when penetrating;
Specifically the first stage injection pressure of the present embodiment is 130bar, and injection moulding speed is 60% maximal rate;Second stage
Injection pressure is 110bar, and injection moulding speed is 45% maximal rate, and the injection pressure of phase III is 60bar, and injection moulding speed is
25% maximal rate.
The present embodiment, by the injection pressure of first stage, the reasonable setting of injection moulding speed, can efficiently control product
Internal stress, cold burden head, the most also fully can discharge the gas in mould, it is to avoid injecting products is caused shrinkage cavity, pore by gas
Phenomenon.
The injection pressure of second stage, the reasonable setting of injection moulding speed so that melted PP-LGF30 material is sufficiently filled
In the die cavity formed after entering dynamic model and cover half matched moulds, reach the demand of the size of front-end module product, thickness so that front end mould
The good molding of block product.
The injection pressure of phase III, the reasonable setting of injection moulding speed so that front-end module product is in final molding
Journey controls the burr of product, improves the surface smoothness of product.
Step 5, pressurize: carry out pressurize by uniformly injection;
Wherein, in step 5, the dwell time is 9 ~ 11s.
Pressurize i.e. keeps the setting of pressure to be for making PP-LGF30 material will not produce backflow, and energy during cooling
Continue to supplement because of PP-LGF30 material cooling meat the space of deficiency, and then available optimal moulding.
In the present embodiment, the dwell time is 9 ~ 11s, uses the rational dwell time, on the one hand avoids the dwell time relatively
Long, cause melt in die cavity to solidify, and inflow entrance not yet freezes the phenomenon of envelope;On the other hand the dwell time is avoided not enough,
Cause density and the undesirable phenomenon of size of product.
Step 6, cooling molding: the time of cooling molding is 80s.
Step 7, the demoulding: after product cooling, ejected by mould machine and carry out product stripping.
Embodiment 2
The Shooting Technique of a kind of PP-LGF30 material fronts module of the present embodiment, its technique is the most same as in Example 1, different
Part is: specifically the barrel of injection machine is heated to 270 DEG C by the present embodiment, and dynamic model temperature in injection mold is heated to 45
DEG C, cover half temperature is heated to 50 DEG C;The injection pressure of first stage is 120bar, and injection moulding speed is 50% maximal rate, second-order
The injection pressure of section is 100bar, and injection moulding speed is 35% maximal rate, and the injection pressure of phase III is 50bar, injection moulding speed
It it is 15% maximal rate.
Embodiment 3
The Shooting Technique of a kind of PP-LGF30 material fronts module of the present embodiment, its technique is the most same as in Example 1, different
Part is: specifically the barrel of injection machine is heated to 270 DEG C by the present embodiment, and dynamic model temperature in injection mold is heated to 45
DEG C, cover half temperature is heated to 50 DEG C;The injection pressure of first stage is 125bar, and injection moulding speed is 55% maximal rate, second-order
The injection pressure of section is 105bar, and injection moulding speed is 40% maximal rate, and the injection pressure of phase III is 55bar, injection moulding speed
It it is 20% maximal rate.
Claims (7)
1. the Shooting Technique of a PP-LGF30 material fronts module, it is characterised in that its step is as follows:
Step one, pretreatment of raw material: utilize baking oven that PP-LGF30 material uses the temperature of 75 ~ 85 DEG C carry out 4 hours being dried place
Reason;
Step 2, equipment pretreatment: the barrel of injection machine is heated to 220 ~ 270 DEG C, and injector screw rod is heated;Will
In injection mold, hot flow path is heated to 265 ~ 275 DEG C, and dynamic model temperature in injection mold is heated to 45 ~ 50 DEG C, and cover half temperature adds
Heat is to 50 ~ 55 DEG C;
Step 3, plasticizing: the PP-LGF30 material after drying in step one is put in the injecting machine material tube in step 2 and profit
PP-LGF30 material after drying with the screw in injection molding machine in step 2 is heated to molten condition;
Step 4, injection: the PP-LGF30 material of molten condition in step 3 is molded into by screw in injection molding machine and nozzle and adds
In the die cavity formed after the dynamic model of heat and cover half matched moulds;
Step 5, pressurize: carry out pressurize by uniformly injection;
Step 6, cooling molding: the time of cooling molding is 80s;
Step 7, the demoulding: after product cooling, ejected by mould machine and carry out front-end module product stripping.
The Shooting Technique of a kind of PP-LGF30 material fronts module the most according to claim 1, it is characterised in that: step 2
The heating-up temperature of middle injector screw rod is 260 ~ 280 DEG C.
The Shooting Technique of a kind of PP-LGF30 material fronts module the most according to claim 2, it is characterised in that: step 2
In middle injection mold, hot flow path is divided into 15 groups, and 15 groups are both heated to 265 ~ 275 DEG C.
The Shooting Technique of a kind of PP-LGF30 material fronts module the most according to claim 3, it is characterised in that: step 4
Middle injection was divided into for three stages: the injection pressure of first stage is 120 ~ 130bar, and injection moulding speed is 50 ~ 60% maximal raties;Second
The injection pressure in stage is 100 ~ 110bar, and injection moulding speed is 35 ~ 45% maximal raties;The injection pressure of phase III is 50 ~
60bar, injection moulding speed is 15 ~ 25% maximal raties.
The Shooting Technique of a kind of PP-LGF30 material fronts module the most according to claim 4, it is characterised in that: step 4
Middle injection time is 15 ~ 17s, and injection terminal is 38 ~ 40 mm.
6. according to the Shooting Technique of a kind of PP-LGF30 material fronts module described in claim 1 or 4, it is characterised in that: step
In rapid five, the dwell time is 9 ~ 11s.
The Shooting Technique of a kind of PP-LGF30 material fronts module the most according to claim 6, it is characterised in that: before production
The metering stroke of end module is 400mm.
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Cited By (14)
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CN108890954A (en) * | 2018-06-28 | 2018-11-27 | 昆山弘正电子科技有限公司 | The injection molding process of router inserted sheet |
CN109093964A (en) * | 2018-08-03 | 2018-12-28 | 昆山弘正电子科技有限公司 | Plastics tapered end injection mold and plastics tapered end Shooting Technique |
CN109093938A (en) * | 2018-08-03 | 2018-12-28 | 昆山弘正电子科技有限公司 | Glass light guide plate injection mold and light guide plate Shooting Technique |
CN109093939A (en) * | 2018-08-03 | 2018-12-28 | 昆山弘正电子科技有限公司 | Register face injection forming mold and the Shooting Technique for manufacturing register face |
CN109093940A (en) * | 2018-08-03 | 2018-12-28 | 昆山弘正电子科技有限公司 | Plastic lock catch injection forming mold and the Shooting Technique for manufacturing plastic lock catch |
CN109093948A (en) * | 2018-08-03 | 2018-12-28 | 昆山弘正电子科技有限公司 | LED panel injection forming mold and the Shooting Technique for manufacturing LED panel |
CN109228173A (en) * | 2018-09-20 | 2019-01-18 | 昆山弘正电子科技有限公司 | The injection mold of handle and the Shooting Technique of handle |
CN109228209A (en) * | 2018-09-20 | 2019-01-18 | 昆山弘正电子科技有限公司 | The injection mold of router lower cover and the Shooting Technique of router lower cover |
CN109228174A (en) * | 2018-09-20 | 2019-01-18 | 昆山弘正电子科技有限公司 | The injection mold of display rear cover and the Shooting Technique of display rear cover |
CN109228207A (en) * | 2018-09-20 | 2019-01-18 | 昆山弘正电子科技有限公司 | The injection mold of router upper cover and the Shooting Technique of router upper cover |
CN109228208A (en) * | 2018-09-20 | 2019-01-18 | 昆山弘正电子科技有限公司 | The injection mold of router base and the Shooting Technique of router base |
CN109732842A (en) * | 2018-12-20 | 2019-05-10 | 合肥旭弘塑胶制品有限公司 | A kind of Shooting Technique |
CN112277236A (en) * | 2020-10-08 | 2021-01-29 | 叶英伟 | Automobile wading throat injection molding process |
CN112829181A (en) * | 2020-12-31 | 2021-05-25 | 昆山东卓精密电子科技有限公司 | Voltage-stabilizing injection molding process for lens barrel of mobile phone camera |
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Cited By (14)
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CN108890954A (en) * | 2018-06-28 | 2018-11-27 | 昆山弘正电子科技有限公司 | The injection molding process of router inserted sheet |
CN109093964A (en) * | 2018-08-03 | 2018-12-28 | 昆山弘正电子科技有限公司 | Plastics tapered end injection mold and plastics tapered end Shooting Technique |
CN109093938A (en) * | 2018-08-03 | 2018-12-28 | 昆山弘正电子科技有限公司 | Glass light guide plate injection mold and light guide plate Shooting Technique |
CN109093939A (en) * | 2018-08-03 | 2018-12-28 | 昆山弘正电子科技有限公司 | Register face injection forming mold and the Shooting Technique for manufacturing register face |
CN109093940A (en) * | 2018-08-03 | 2018-12-28 | 昆山弘正电子科技有限公司 | Plastic lock catch injection forming mold and the Shooting Technique for manufacturing plastic lock catch |
CN109093948A (en) * | 2018-08-03 | 2018-12-28 | 昆山弘正电子科技有限公司 | LED panel injection forming mold and the Shooting Technique for manufacturing LED panel |
CN109228173A (en) * | 2018-09-20 | 2019-01-18 | 昆山弘正电子科技有限公司 | The injection mold of handle and the Shooting Technique of handle |
CN109228209A (en) * | 2018-09-20 | 2019-01-18 | 昆山弘正电子科技有限公司 | The injection mold of router lower cover and the Shooting Technique of router lower cover |
CN109228174A (en) * | 2018-09-20 | 2019-01-18 | 昆山弘正电子科技有限公司 | The injection mold of display rear cover and the Shooting Technique of display rear cover |
CN109228207A (en) * | 2018-09-20 | 2019-01-18 | 昆山弘正电子科技有限公司 | The injection mold of router upper cover and the Shooting Technique of router upper cover |
CN109228208A (en) * | 2018-09-20 | 2019-01-18 | 昆山弘正电子科技有限公司 | The injection mold of router base and the Shooting Technique of router base |
CN109732842A (en) * | 2018-12-20 | 2019-05-10 | 合肥旭弘塑胶制品有限公司 | A kind of Shooting Technique |
CN112277236A (en) * | 2020-10-08 | 2021-01-29 | 叶英伟 | Automobile wading throat injection molding process |
CN112829181A (en) * | 2020-12-31 | 2021-05-25 | 昆山东卓精密电子科技有限公司 | Voltage-stabilizing injection molding process for lens barrel of mobile phone camera |
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