CN101746021A - Injection molding method for front frame shell of television or display screen - Google Patents
Injection molding method for front frame shell of television or display screen Download PDFInfo
- Publication number
- CN101746021A CN101746021A CN200810136444A CN200810136444A CN101746021A CN 101746021 A CN101746021 A CN 101746021A CN 200810136444 A CN200810136444 A CN 200810136444A CN 200810136444 A CN200810136444 A CN 200810136444A CN 101746021 A CN101746021 A CN 101746021A
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- front frame
- injection molding
- frame shell
- display screen
- melt
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- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses an injection molding method for a front frame shell of a television or a display screen. In the method, a single gate is adopted to pour, and the method combines the gas-aid injection molding technology to eliminate the defects that multi-point pouring possibly produces plastic welding traces among the flow passages and the like; and the formed product has excellent appearance quality, has no sink mark and buckling deformation, and improves the mechanical property of workpieces. Simultaneously, the method reduces waste loss in the flow passages caused by setting a plurality of gates, reduces the cost, and improves the comprehensive benefit.
Description
Technical field
The present invention relates to a kind of injection molding forming method, this method is the front baffle that is used for producing television set or display screen.
Background technology
Television set or display screen, the particularly front frame shell of CRT TV, display screen mostly are complicated cambered shell greatly, and post position and muscle position are all many.This front frame shell adopts the method for injection mo(u)lding to make usually, can be filled with whole die cavity smoothly in order to make plastic melt, and the cast gate more than three all can be set in conventional method commonly used.But when adopting this multiple spot glue-feeding system, between per two runners, can produce more serious plastically welding trace defective, and the shrink mark and the buckling deformation problem that also are difficult to solve in cooling procedure and are produced.Therefore the outward appearance of final products can be affected, and mechanical performance also descends relatively.
Summary of the invention
The object of the present invention is to provide a kind of gas assistant injection molding method, the injecting products quality that adopts this method to produce is better.
The technical solution used in the present invention is:
The injection molding forming method of a kind of television set or display screen front frame shell comprises melt injection, pressurize, cooling, demoulding step.In described melt injecting step, only adopt a cast gate, and the plastic melt quality of injecting is 93～97% of a described front frame shell quality.After described melt injecting step, go back the air inclusion injecting step, in this step, inject gases at high pressure in the plastic melt in die cavity.Described pressurize step is the gas pressurize.
Described cast gate is positioned at the middle and upper part, the back side of described front frame shell.Described cast gate is a rectangle, and length is 18～20 millimeters, and width is 1.2～1.5 millimeters.
On the mould of Shi Yonging, offer an air discharge duct for 40～50 millimeters along the every spacing of flowing to of described plastic melt in the method, described air discharge duct is positioned on the die joint of described mould.
Described gas is nitrogen.
Have following advantage according to gas assistant injection molding method of the invention process:
1, adopt the single-point running gate system, eliminated the plastics that the multiple spot cast may produce and weld defectives such as trace between each runner, formed product appearance good quality, no shrink mark, no buckling deformation has improved the mechanical performance of product.Reduced also simultaneously that the interior waste loss of runner that a plurality of cast gate brings being set, reduced cost, improved comprehensive benefit.
2, in conjunction with the gas-assisted injection molding forming technique, plastic melt can be injected in the die cavity smoothly, glibly from single cast gate, finish whole stowing operation, guaranteed the quality of injection moulding.
The specific embodiment
Below in conjunction with embodiment the specific embodiment of the present invention is described:
Embodiment 1:
The preceding frame shell product of colour TV is made of the basic panel that vertically extends and the base plate of level.When being running gate system on its designing mould, unique cast gate is opened center line top at back side of panel, gate size is 20 * 1.5 millimeters.At the die joint of mould, an air discharge duct is offered for 50 millimeters in every interval.
At first plastic melt is injected die cavity in cast gate, melt need be filled to the rear side end of base plate from the middle and upper part of shell always, and its flow process is about 1000 millimeters.The injection rate of strict control melt is 95% of a shell end product quality, and the size of cast gate can guarantee that melt can be filled with whole cavity in the shortest time.
In plastic melt, inject high pressure nitrogen then, successfully finish whole stowing operation to promote plastic melt.Between the step of melt injection and gas injection, also must be through an of short duration switching delay time.
After gas is injected and finished, keep the constant or slightly rising of gas pressure in the melt, make that gas can continue to penetrate in plastic melt inside, to compensate the contraction that plastic cool causes.Treat plastic cool after have certain rigidity and intensity, make air pressure reduce to zero, die sinking can be taken out finished product.
As mentioned above, we are illustrated according to aim of the present invention fully, but the present invention is not limited to the foregoing description and implementation method.The practitioner of correlative technology field can carry out different variations and enforcement in the scope of technological thought permission of the present invention.
Claims (5)
1. the injection molding forming method of television set or display screen front frame shell comprises melt injection, pressurize, cooling, demoulding step, it is characterized in that:
In described melt injecting step, only adopt a cast gate, and the plastic melt quality of injecting is 93～97% of described front frame shell quality,
After described melt injecting step, go back the air inclusion injecting step, in this step, inject gases at high pressure in the plastic melt in die cavity,
Described pressurize step is the gas pressurize.
2. the injection molding forming method of a kind of television set according to claim 1 or display screen front frame shell is characterized in that: described cast gate is positioned at the middle and upper part, the back side of described front frame shell.
3. the injection molding forming method of a kind of television set according to claim 2 or display screen front frame shell is characterized in that: described cast gate is a rectangle, and length is 18～20 millimeters, and width is 1.2～1.5 millimeters.
4. the injection molding forming method of a kind of television set according to claim 1 or display screen front frame shell, it is characterized in that: in the method on the mould of Shi Yonging, offer an air discharge duct for 40～50 millimeters along the every spacing of flowing to of described plastic melt, described air discharge duct is positioned on the die joint of described mould.
5. the injection molding forming method of a kind of television set according to claim 1 or display screen front frame shell is characterized in that: described gas is nitrogen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810136444A CN101746021A (en) | 2008-12-04 | 2008-12-04 | Injection molding method for front frame shell of television or display screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810136444A CN101746021A (en) | 2008-12-04 | 2008-12-04 | Injection molding method for front frame shell of television or display screen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101746021A true CN101746021A (en) | 2010-06-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810136444A Pending CN101746021A (en) | 2008-12-04 | 2008-12-04 | Injection molding method for front frame shell of television or display screen |
Country Status (1)
| Country | Link |
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| CN (1) | CN101746021A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102814931A (en) * | 2012-09-03 | 2012-12-12 | 晟扬精密模具（昆山）有限公司 | Production mould for front frame of notebook display |
| CN102896753A (en) * | 2012-11-06 | 2013-01-30 | 四川长虹模塑科技有限公司 | Deformation degree control method of flat-screen television panel injection molding process |
| CN102922709A (en) * | 2012-11-12 | 2013-02-13 | 四川长虹模塑科技有限公司 | Method for inward concave deformation adjustment of frame type plastic injection product |
| CN103546784A (en) * | 2013-10-09 | 2014-01-29 | 深圳市九洲电器有限公司 | Set-top box |
| CN106182661A (en) * | 2016-07-11 | 2016-12-07 | 合肥通泰光电科技有限公司 | A kind of production technology of TV set LCD glue frame |
| CN106313459A (en) * | 2016-08-18 | 2017-01-11 | 上海未来伙伴机器人有限公司 | Robot product shell manufacturing method adopting nitrogen forming |
-
2008
- 2008-12-04 CN CN200810136444A patent/CN101746021A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102814931A (en) * | 2012-09-03 | 2012-12-12 | 晟扬精密模具（昆山）有限公司 | Production mould for front frame of notebook display |
| CN102896753A (en) * | 2012-11-06 | 2013-01-30 | 四川长虹模塑科技有限公司 | Deformation degree control method of flat-screen television panel injection molding process |
| CN102896753B (en) * | 2012-11-06 | 2015-02-11 | 四川长虹模塑科技有限公司 | Deformation degree control method of flat-screen television panel injection molding process |
| CN102922709A (en) * | 2012-11-12 | 2013-02-13 | 四川长虹模塑科技有限公司 | Method for inward concave deformation adjustment of frame type plastic injection product |
| CN103546784A (en) * | 2013-10-09 | 2014-01-29 | 深圳市九洲电器有限公司 | Set-top box |
| CN106182661A (en) * | 2016-07-11 | 2016-12-07 | 合肥通泰光电科技有限公司 | A kind of production technology of TV set LCD glue frame |
| CN106313459A (en) * | 2016-08-18 | 2017-01-11 | 上海未来伙伴机器人有限公司 | Robot product shell manufacturing method adopting nitrogen forming |
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Open date: 20100623 |