CN106378908A - Overlapped injection mold structure for mobile phone shell - Google Patents
Overlapped injection mold structure for mobile phone shell Download PDFInfo
- Publication number
- CN106378908A CN106378908A CN201611129170.5A CN201611129170A CN106378908A CN 106378908 A CN106378908 A CN 106378908A CN 201611129170 A CN201611129170 A CN 201611129170A CN 106378908 A CN106378908 A CN 106378908A
- Authority
- CN
- China
- Prior art keywords
- mould
- mold
- mold cavity
- die
- phone housing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000002347 injection Methods 0.000 title claims abstract description 44
- 239000007924 injection Substances 0.000 title claims abstract description 44
- 238000001746 injection moulding Methods 0.000 claims abstract description 10
- 229920003023 plastic Polymers 0.000 claims abstract description 10
- 239000004033 plastic Substances 0.000 claims abstract description 10
- 230000005484 gravity Effects 0.000 claims abstract description 5
- 238000003475 lamination Methods 0.000 claims description 15
- 238000000465 moulding Methods 0.000 claims description 10
- 230000004907 flux Effects 0.000 claims description 6
- 239000003292 glue Substances 0.000 claims description 6
- 239000004615 ingredient Substances 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 27
- 239000010410 layer Substances 0.000 description 23
- 238000005516 engineering process Methods 0.000 description 5
- 239000002356 single layer Substances 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000009412 basement excavation Methods 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 208000002925 dental caries Diseases 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000004781 supercooling Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- 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
- B29C45/32—Moulds having several axially spaced mould cavities, i.e. for making several separated articles
-
- 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
- B29C45/32—Moulds having several axially spaced mould cavities, i.e. for making several separated articles
- B29C45/322—Runner systems for distributing the moulding material to the stacked mould cavities
-
- 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
- B29C45/40—Removing or ejecting moulded articles
- B29C45/4005—Ejector constructions; Ejector operating mechanisms
-
- 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
- B29C45/64—Mould opening, closing or clamping devices
- B29C45/66—Mould opening, closing or clamping devices mechanical
-
- 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
- B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
- B29L2031/3431—Telephones, Earphones
- B29L2031/3437—Cellular phones
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses an overlapped injection mold structure for a mobile phone shell. A complete set of mold is internally at least provided with two layers of mold cavities which are overlapped in a mold closing direction, and a plastic product can be molded by simultaneously utilizing the two layers of mold cavities; and a runner system of the mold adopts a hot runner, and rubber enters the two layers of mold cavities through a hot sprue and a middle hot runner plate after entering from a main nozzle. The mold is provided with two groups of guide posts and ball guide sleeves which are respectively used for guiding and locating templates at the outer sides of the two layers of mold cavities; the mold is provided with a mold opening and closing linkage system composed of a gear and two racks; and a bearing system composed of two bearing blocks is arranged at the middle part of the mold, is hung above the guide posts of an injection molding machine and is used for assisting in bearing the gravity of a middle suspended part of the mold. The utilization ratio and production efficiency of equipment are increased greatly, and the aim of reducing the production cost is achieved.
Description
Technical field
The present invention relates to a kind of injection mold, in more particularly, to a kind of one set of die, there are multiple die cavities overlapping in matched moulds direction
The lamination injection mold structure of the phone housing of arrangement.
Background technology
On injection machine during molding production, the shot of injection machine and opening stroke generally all only use ordinary injection die
The 20%～40% of rated value, does not give full play to the performance of injection machine, wastes the production capacity of injection machine.If abundant excavate
The performance of injection machine, can also reduce production cost further.Therefore, it is necessary to develop a kind of laminated mould technology, by several
Monolayer common die is superimposed together, and carries out molding production on an injection machine, to give full play to the potential of injection machine, carries
High efficiency, and reduce production cost further.
Under normal circumstances, common die only has a stratotype chamber, i.e. one layer of die joint on matched moulds direction.
As shown in figure 1, common die is generally by form frame system 1-1, flow passage system 1-2, die cavity, guidance system 1-4, ejection
The part such as system 1-6 forms.The type of mould during matched moulds, is constituted by die cavity (front mould part) 1-3 and die cavity (rear mold part) 1-5
Chamber, that is, the die space for fill plastic cement consistent with needing shape of product, common die only has one layer of such type
Chamber.The plane that die cavity (front mould part) 1-3 contacts with die cavity (rear mold part) 1-5 is die joint, common die only one of which
Such die joint.When mould matched moulds on injection machine carries out molding production, melt plastic cement is filled in type through flow passage system 1-2
Chamber, filling completes after supercooling, and mould molds into front mould and two parts of rear mold along die joint, and the product after cooling stays mould
The rear mold part of tool, and the ejection system 1-6 ejection by mould, complete a molding cycle.
The shortcoming of above-mentioned prior art is：
On injection machine during molding production, the shot of injection machine and opening stroke generally all only employ volume to common die
The 20%～40% of definite value, does not give full play to the performance of injection machine, wastes the production capacity of injection machine, improves production cost.
Particularly in today that mobile communication industry develops rapidly at this stage, quickly, life cycle is very short for mobile phone update speed, and
Especially big to the production capacity demand of phone housing, especially fast to the supply of material rate request of phone housing, even if increasing common injection mould
The backed stamper quantity of tool is it is also difficult to reach the requirement to supply of material speed for the client.
Content of the invention
It is an object of the invention to provide a kind of production efficiency height, the lamination injection mould of the phone housing of low production cost are signed an undertaking
Structure.
The purpose of the present invention is achieved through the following technical solutions：
The lamination injection mold structure of the phone housing of the present invention, at least two-layer mold cavity in whole set of die, they
In mould matched moulds direction overlapping arrangement, two-layer mold cavity moulding plastic product can be utilized simultaneously；
The flow passage system of mould uses hot flow path, through hot mouth and middle heat flux plates to two-layer mould after major ingredient nozzle enters glue
Die cavity enters glue.
As seen from the above technical solution provided by the invention, technical scheme provided in an embodiment of the present invention overcome general
Logical mould cannot make full use of equipment performance, the relatively low problem of production efficiency, through checking repeatedly and improvement, has invented one
Cover the laminated mould technology of brand-new phone housing, to reach abundant excavation injection moulding machine production capacity, equipment utilization is greatly improved
Rate and production efficiency, and reduce the purpose of production cost.
Brief description
Fig. 1 is the structural representation of ordinary injection die structure in prior art.
Fig. 2 is the matched moulds view of the lamination injection mold structure of phone housing provided in an embodiment of the present invention.
Fig. 3 is the die opening state schematic diagram of the lamination injection mold structure of phone housing provided in an embodiment of the present invention.
Fig. 4 is the structural representation of bearing system in the embodiment of the present invention.
In figure：
1-1. form frame system, 1-2. flow passage system, 1-3. die cavity (front mould part), 1-4. guidance system, 1-5. die cavity (after
Mould part), 1-6. ejection system；
11. front cavitys one, 12. rear cavities one, 21. front cavitys two, 22. rear cavities two, 3. form frame system, 4. hot flow path system
System, 5. guidance system, 6. folding mould linked system, 7. two-way ejection system；
8. bearing system, 9. injection machine guide pillar.
Specific embodiment
With reference to the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Ground description is it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Based on this
Inventive embodiment, the every other enforcement that those of ordinary skill in the art are obtained under the premise of not making creative work
Example, broadly falls into protection scope of the present invention.
The lamination injection mold structure of the phone housing of the present invention, its preferably specific embodiment is：
At least two-layer mold cavity in whole set of die, they can utilize two in mould matched moulds direction overlapping arrangement simultaneously
Layer mold cavity moulding plastic product；
The flow passage system of mould uses hot flow path, through hot mouth and middle heat flux plates to two-layer mould after major ingredient nozzle enters glue
Die cavity enters glue.
Mould is provided with the template direction positioning outside two groups of guide pillars and ball bearing guide bushing respectively two-layer mold cavity, two-layer mould
Two pieces of templates in the middle of tool die cavity rely on positioning finger setting.
Mould is provided with the folding mould linked system being made up of a gear and two toothed rack, and two toothed rack are respectively to two-layer mould
Template movement outside tool die cavity, drives same pinion rotation, to ensure the template die opening state outside two-layer mold cavity
It is identical.
Mould arranges the two-way ejection system being made up of T-shaped arm-tie and the middle fixed block of both sides, to ensure two-layer mould
Template outside tool die cavity smoothly realizes ejection action.
The mid portion of mould is provided with the bearing system being made up of two carrier blocks, is fixed on the upper of mould mid portion
Side, and stretch out to mould both sides, hang over above the guide pillar of injection moulding machine, auxiliary bears the gravity of overhanging portion in the middle of mould.
Below in conjunction with accompanying drawing, the embodiment of the present invention is described in further detail.
Laminated mould is a kind of mould cutting edge technology being different from ordinary injection die, and common die only has in matched moulds direction
One layer of mold cavity, because laminated mould is disposed with two or more mold cavities on matched moulds direction, and in mould molding
The time of the filling in cycle, pressurize and cooling stage and common single-face mold tool are essentially identical, and therefore production efficiency is common
The twice of monolayer mold or many times, can be greatly improved the efficiency that injection produces, and reduce the cost that injection produces.
The lamination injection mold structure of the phone housing of the present invention, overcomes common die and cannot make full use of equipment
Can, the relatively low problem of production efficiency, through checking repeatedly and improvement, invent the palletizing die of a set of brand-new phone housing
Tool technology, to reach abundant excavation injection moulding machine production capacity, is greatly improved utilization rate of equipment and installations and production efficiency, and reduces life
Produce the purpose of cost.
Specific embodiment：
As shown in Figure 2 and Figure 3, phone housing laminated mould of the present invention mainly include die cavity one and die cavity two, form frame system 3,
TOP-TIP 4, guidance system 5, folding mould linked system 6, two-way ejection system 7 and bearing system 8 form, bearing system
8 is as shown in Figure 4.
As shown in Figure 2 and Figure 3, form frame system 3 is the main body of phone housing laminated mould of the present invention, is used to install each
Function system and the pedestal realizing mould open/close mould action.
Die cavity one is made up of front cavity 1 and rear cavity 1, and die cavity two is by front cavity 2 21 and 2 22 groups of rear cavity
Become, they, in mould matched moulds direction overlapping arrangement, constitute the mold cavity for shaped article shape for the two-layer, be different from general
Logical mould only has the maximum feature of one layer of mold cavity.
The flow passage system of phone housing laminated mould of the present invention using diagram TOP-TIP 4 it is illustrated that hot flow path system
The internal dashed area of system 4 is flow path within TOP-TIP for the molten plastic, that is, from the major ingredient nozzle mouth on diagram the right
After portion flows into, through flowing to the heat flux plates of centre inside hot mouth, then flow in the two-layer die cavity of the left and right sides through middle heat flux plates,
Complete the filling of plastics.
The guidance system 5 of phone housing laminated mould of the present invention mainly exists with the difference of the guidance system of common die
In this phone housing laminated mould component shows that the two groups of guide pillar guide pin bushings in left and right are individually directed positioning, and it is fixed that middle two pieces of templates rely on
Position finger setting.The template at rear cavity one and rear cavity two place fixes one group of ball bearing guide bushing, front cavity one and front cavity two respectively
The template being located fixes one group of guide pillar respectively, is fixed on one after front cavity one and the positioning finger setting of front cavity two corresponding template
Rise, the guide pillar of the whole utilization left and right sides of 2 layers of front cavity composition carries out guiding respectively with the rear cavity guide pin bushing of the left and right sides to be determined
Position, the guide pillar guide pin bushing state in the case of die sinking is as shown in Figure 3.
Folding mould linked system 6 as best seen in figure 2, is mainly made up of a gear and two toothed rack, when this phone housing
During laminated mould die sinking, the rear mold of two side portions and the front mould of mid portion separate, because two toothed rack are divided at 2 layers of die joint
It is not fixed on the rear mold part of the left and right sides, both sides move horizontally tooth bar to the left and right, drive and be fixed on the same of middle front mould part
One pinion rotation, idler gear is the same with the speed of the relative motion of left and right two toothed rack, simply in opposite direction.This is just
Ensure that the rear mold part of the left and right sides and the front mould part die opening state of mid portion are identicals, when having reached folding mould
The linkage of both sides rear mold requires, and the mould state after die sinking is as shown in Figure 3.
Due to this phone housing laminated mould more than common die a stratotype chamber, wherein one layer of rear mold part is in mould
Main feed nozzle side, injection moulding machine does not push up the ejecting mechanisms such as rod to execute ejection action, therefore, outside this mobile phone
Two-way ejection system 7 is provided with shell laminated mould.Two-way ejection system 7 as shown in Figure 2 main by being arranged on the left and right sides
T-shaped arm-tie and the fixed block composition being arranged on centre, T-shaped arm-tie is separately fixed at the ejector retainner plate of left and right sides rear mold part
On, middle fixed block is fixed on the front mould part of centre.After mould molds certain distance, the head of T-shaped arm-tie and centre are solid
Determine block contact, then mould continues die sinking, T-shaped arm-tie drives ejector retainner plate to move, realize the purpose of ejecting product after mould die sinking.
After mould die sinking, the state of two-way ejection system 7 is as shown in Figure 3.
This phone housing laminated mould due to there being a more than stratotype chamber, after the die sinking of more than one die joint, therefore mould,
As shown in Figure 3 situation occurs, the centre of mould some completely hanging it is impossible to be fixed on the panel of injection machine, and only
Only rely only on the mould support with both sides for the guide pillar, the gravity of mould mid portion easily causes the deformation of guide pillar, the therefore present invention
The mid portion of phone housing laminated mould is provided with bearing system 8, as shown in figure 4, bear hanging in the middle of mould as auxiliary
Partial gravity.Bearing system 8 is made up of left and right two carrier block, is fixed on the top of mould mid portion, and to mould two
While stretching out, hang over above the guide pillar of injection moulding machine, to avoid the deformation of mould.
When phone housing laminated mould of the present invention carries out molding production on injection machine, after mould matched moulds, molten plastic
From the injection of hot flow path right-hand member major ingredient nozzle, injection left and right sides die cavity after hot mouth and heat flux plates, mould die sinking, is opening after cooling
In the presence of matched moulds linked system, two-layer die joint is synchronously opened, and is then completed the ejection of plastic product by two-way ejection system,
Last matched moulds synchronous in the presence of folding mould linked system, carries out the production of next injection molding cycle.
Beneficial effects of the present invention：
This phone housing lamination injection mold due to there being two-layer mold cavity, and the filling of mould, pressurize and cooling when
Between essentially identical with monolayer ordinary injection die, therefore, production efficiency doubles than monolayer ordinary injection die, if using many
Layer mold cavity, production efficiency even can reach many times of monolayer ordinary injection die.
This phone housing lamination injection mold takes into full account the working condition of common injection molding machine, may be mounted at general
Produced on logical injection molding machine, be not required to additionally purchase production machine and equipment, can save machine, equipment, Factory Building and
The cost of incoming labor force.
The above, the only present invention preferably specific embodiment, but protection scope of the present invention is not limited thereto,
Any those familiar with the art in the technical scope of present disclosure, the change or replacement that can readily occur in,
All should be included within the scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of claims
Enclose and be defined.
Claims (5)
1. a kind of lamination injection mold structure of phone housing is it is characterised in that at least two-layer mold cavity in whole set of die,
They can utilize two-layer mold cavity moulding plastic product in mould matched moulds direction overlapping arrangement simultaneously；
The flow passage system of mould uses hot flow path, through hot mouth and middle heat flux plates to two-layer mold cavity after major ingredient nozzle enters glue
Enter glue.
2. the lamination injection mold structure of phone housing according to claim 1 is it is characterised in that mould is provided with two groups leads
Post and ball bearing guide bushing are respectively the template direction positioning outside two-layer mold cavity, two pieces of templates in the middle of two-layer mold cavity according to
By positioning finger setting.
3. the lamination injection mold structure of phone housing according to claim 2 is it is characterised in that mould is provided with by one
Gear and two toothed rack composition folding mould linked system, two toothed rack respectively to the template movement outside two-layer mold cavity,
Drive same pinion rotation, to ensure that the template die opening state outside two-layer mold cavity is identical.
4. the lamination injection mold structure of phone housing according to claim 3 is it is characterised in that mould is arranged by both sides
T-shaped arm-tie and middle fixed block composition two-way ejection system, smoothly real to ensure the template outside two-layer mold cavity
Now ejection action.
5. the lamination injection mold structure of phone housing according to claim 4 is it is characterised in that the mid portion of mould
It is provided with the bearing system being made up of two carrier blocks, is fixed on the top of mould mid portion, and stretch out to mould both sides, hang
Above the guide pillar of injection moulding machine, auxiliary bears the gravity of overhanging portion in the middle of mould.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611129170.5A CN106378908B (en) | 2016-12-09 | 2016-12-09 | A kind of lamination injection mold structure of phone housing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611129170.5A CN106378908B (en) | 2016-12-09 | 2016-12-09 | A kind of lamination injection mold structure of phone housing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106378908A true CN106378908A (en) | 2017-02-08 |
| CN106378908B CN106378908B (en) | 2018-11-30 |
Family
ID=57959644
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611129170.5A Active CN106378908B (en) | 2016-12-09 | 2016-12-09 | A kind of lamination injection mold structure of phone housing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106378908B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107584727A (en) * | 2017-10-27 | 2018-01-16 | 浙江力松机械有限公司 | Three-plate type composite die injection machine |
| TWI667086B (en) * | 2018-10-26 | 2019-08-01 | 財團法人金屬工業研究發展中心 | Forming apparatus with back pressure |
| CN110605834A (en) * | 2019-09-18 | 2019-12-24 | 深圳市杰美晟模具有限公司 | Die sinking guiding mechanism of large-scale mould |
| CN113085097A (en) * | 2021-04-12 | 2021-07-09 | 广州卓尔博科技有限公司 | Laminated injection mold |
-
2016
- 2016-12-09 CN CN201611129170.5A patent/CN106378908B/en active Active
Non-Patent Citations (3)
| Title |
|---|
| 彼得.恩格: "《注射模具130例 第二版》", 31 May 2008 * |
| 朱海旭、王金莲: "《基于CAE技术的餐盒盖叠层热流道注射模具设计》", 《装备制造技术》 * |
| 田宝善等: "《塑料注射模具设计技巧与实例 第二版》", 31 August 2009 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107584727A (en) * | 2017-10-27 | 2018-01-16 | 浙江力松机械有限公司 | Three-plate type composite die injection machine |
| TWI667086B (en) * | 2018-10-26 | 2019-08-01 | 財團法人金屬工業研究發展中心 | Forming apparatus with back pressure |
| CN110605834A (en) * | 2019-09-18 | 2019-12-24 | 深圳市杰美晟模具有限公司 | Die sinking guiding mechanism of large-scale mould |
| CN113085097A (en) * | 2021-04-12 | 2021-07-09 | 广州卓尔博科技有限公司 | Laminated injection mold |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106378908B (en) | 2018-11-30 |
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