CN107297856A - A kind of flexible glue arch product injection moulding process - Google Patents

A kind of flexible glue arch product injection moulding process Download PDF

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Publication number
CN107297856A
CN107297856A CN201710598018.XA CN201710598018A CN107297856A CN 107297856 A CN107297856 A CN 107297856A CN 201710598018 A CN201710598018 A CN 201710598018A CN 107297856 A CN107297856 A CN 107297856A
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CN
China
Prior art keywords
flexible glue
arch
injection moulding
moulding process
mould
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
Application number
CN201710598018.XA
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Chinese (zh)
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CN107297856B (en
Inventor
张智杰
马立平
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Goertek Techology Co Ltd
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Goertek Inc
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Filing date
Publication date
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Priority to CN201710598018.XA priority Critical patent/CN107297856B/en
Publication of CN107297856A publication Critical patent/CN107297856A/en
Application granted granted Critical
Publication of CN107297856B publication Critical patent/CN107297856B/en
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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
    • B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
    • 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
    • B29C45/34—Moulds having venting means
    • 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
    • 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
    • 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
    • B29C2945/76655—Location of control
    • B29C2945/76658—Injection unit
    • 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
    • B29C2945/76822—Phase or stage of control
    • B29C2945/76859—Injection

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  • 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 a kind of flexible glue arch product injection moulding process.The flexible glue arch product injection moulding process includes：Mould is provided, the mould includes the die cavity and arch die joint for being used to be molded flexible glue arch product, cast gate and two exhaust passages are provided with the mould, two exhaust passages are connected positioned at the both sides of the arch die joint length direction and with the die cavity respectively；Melting flexible glue material stage injection is entered in the mold cavity, when latter end is injected, the issuing velocity control of melting flexible glue material is in 10mm/s 15mm/s；When the end positions of the arch die joint length direction finally fill up melt plastic cement material, melting flexible glue material is full of the mold cavity；Pressurize is carried out to the mould.The invention solves the problems that a technical problem be that the gas produced in existing flexible glue arch product injection moulding process can not be discharged.

Description

A kind of flexible glue arch product injection moulding process
Technical field
The present invention relates to injection molding technology field, more particularly it relates to a kind of flexible glue arch product injection moulding process.
Background technology
In the injection molding process of plasthetics, the soft rubber mobility such as TPU preferably, is easily produced in heating or injection The gases such as raw gas.Especially, it is special due to arch article construction shape when plasthetics is the product of flexible glue arch shape The gas produced in property, injection moulding process timely and effective can not be discharged.
The gases such as the gas produced in forming process can not be discharged effectively, and meeting generation exhaust in mold cavity is bad, The defect of burning on plasthetics surface is not only caused, the pollution to mould is also add.Meanwhile, the gas of laying dust can also be produced instead Reduce to pressure and fill film speed, make board operating unstable, and debugging cycle length, difficulty are big, not only increase the guarantor of mould Maintenance frequency is supported, the mold use life-span is also shortened.
At present, exhaust is increased by the whole die joint to mould, discharge methane gas is had certain effect.But, Due to determining that whole die joint increases the size of exhaust, it is more difficult to realize, and it can cause that flexible glue product flash is serious, product size It is unstable.
Therefore, it is necessary to be improved to flexible glue arch product injection moulding process.
The content of the invention
It is an object of the present invention to provide a kind of new solution of flexible glue arch product injection moulding process.
According to an aspect of the invention, there is provided a kind of flexible glue arch product injection moulding process.The flexible glue arch product is noted Molding process includes：Mould is provided, the mould includes the die cavity and arch die joint for being used to be molded flexible glue arch product, in institute Mould is stated provided with cast gate and two exhaust passages, two exhaust passages are located at the arch die joint length direction respectively Both sides and also connected with the die cavity；Melting flexible glue material stage injection is entered in the mold cavity, when latter end is injected, melted Melt the control of flexible glue material issuing velocity in 10mm/s-15mm/s；When the end positions of the arch die joint length direction are finally filled out During full melt plastic cement material, melting flexible glue material is full of the mold cavity；Pressurize is carried out to the mould.
Alternatively, when carrying out pressurize to the mould, pressurize speed control is in 4mm/s-10mm/s.
Alternatively, the one end of the exhaust passage away from the die cavity is connected with air processing unit.
Alternatively, the exhaust passage includes the air discharge duct that one end is connected with the die cavity, and the air discharge duct is located at described One end of arch die joint length direction.
Alternatively, the mould includes fixed half and moving half, and the die cavity is arranged on the cover half, and the air discharge duct is set In on the cover half.
Alternatively, the exhaust passage also includes gas port, and the air discharge duct is in communication with the outside by the gas port.
Alternatively, the aperture of the gas port is 5 millimeters.
Alternatively, the cast gate includes two side gates.
Alternatively, two side gates are located on the arch die joint, and two side gates divide the arch The length in type face is divided into three sections.
Alternatively, injector is also provided with, the injector includes expects pipe, melting flexible glue material is being injected into the mould When in die cavity, the temperature control of the barrel is at 210 DEG C -230 DEG C.
It was found by the inventors of the present invention that in flexible glue arch product injection moulding process, due to the spy of arch article construction shape The methane gas produced in different property, injection moulding process timely and effective can not be discharged.This can cause the interior exhaust of mold cavity bad, cause The defect of burning on plasthetics surface, adds the pollution to mould.Meanwhile, the gas of accumulation, which can also produce buffer brake, to be caused The reduction of film speed is filled, makes board operating unstable, and debugging cycle length, difficulty are big, not only increase the maintenance time of mould Number, also shortens the mold use life-span.Therefore, the present invention to be realized technical assignment or technical problem to be solved Be it is that those skilled in the art never expect or it is not expected that, therefore the present invention is a kind of new technical scheme.
In the flexible glue arch product injection moulding process that the present invention is provided, structure, profile feature for flexible glue arch product are right Its injection moulding process is specifically designed.Mould includes die cavity and arch die joint, and two exhaust passages are respectively positioned at arch point Two side positions in type face and connected with die cavity.During continuing melting flexible glue material being injected into mold cavity, arch Melt plastic cement material is finally just filled up at the two ends of die joint, is now melted flexible glue material and is full of mold cavity.In injection process, exhaust Passage will not be melted flexible glue material and block, and gas can in time be discharged by two exhaust passages, will not be remained in die cavity.
Melting flexible glue material, which is segmented, to be injected into mold cavity, when latter end is injected, the issuing velocity control of melting flexible glue material In 10mm/s-15mm/s.Latter end injection speed will not be too fast, ensure that the gas of generation is arranged by two exhaust passages in time Go out, will not remain in arch die cavity.
By referring to the drawings to the detailed description of the exemplary embodiment of the present invention, further feature of the invention and its Advantage will be made apparent from.
Brief description of the drawings
The accompanying drawing for being combined in the description and constituting a part for specification shows embodiments of the invention, and even It is used for the principle for explaining the present invention together with its explanation.
Fig. 1 is the schematic diagram of the flexible glue arch product injection moulding process provided in an embodiment of the present invention；
Fig. 2 is the structural representation of the mould provided in an embodiment of the present invention.
Wherein, 10：Die cavity；11：Arch die joint；12：Cast gate；13：Air discharge duct；14：Gas port.
Embodiment
The various exemplary embodiments of the present invention are described in detail now with reference to accompanying drawing.It should be noted that：Unless had in addition Body illustrates that the part and the positioned opposite of step, numerical expression and numerical value otherwise illustrated in these embodiments does not limit this The scope of invention.
The description only actually at least one exemplary embodiment is illustrative below, never as to the present invention And its any limitation applied or used.
It may be not discussed in detail for technology, method and apparatus known to person of ordinary skill in the relevant, but suitable In the case of, the technology, method and apparatus should be considered as a part for specification.
In shown here and discussion all examples, any occurrence should be construed as merely exemplary, without It is as limitation.Therefore, other examples of exemplary embodiment can have different values.
It should be noted that：Similar label and letter represents similar terms in following accompanying drawing, therefore, once a certain Xiang Yi It is defined, then it need not be further discussed in subsequent accompanying drawing in individual accompanying drawing.
The invention provides a kind of injection moulding process of flexible glue arch product, the injection moulding process is used to be molded flexible glue arch system Product.The gases such as the gas that flexible glue material is produced in heating, process of injection molding can be discharged in time, will not remain in mould type Intracavitary.For example, flexible glue material can be TPU (Thermoplastic polyurethanes, TPUE rubber) Or other materials flexible glue material.Flexible glue arch product includes arcuate shape in its longitudinal direction.For example, flexible glue arch product can It is in or approximately in arch-shaped structure, banana-shaped structure or other domes.
With reference to Fig. 1, the injection moulding process comprises the following steps：
Mould for being molded flexible glue arch product is provided.With reference to Fig. 2, the mould includes being used to be molded flexible glue arch system The die cavity 10 and arch die joint 11 of product.The die cavity 10 is designed according to the concrete shape of required flexible glue arch product.Institute State arch die joint 11 be used for take out the flexible glue arch product that is molded in the die cavity 10.For example, the arch die joint 11 Can be planar structure, wherein two relative sides are in parallel camber line in parallel camber line or approximately on the arch die joint 11.
Cast gate 12 and two exhaust passages are provided with the mould.Melting flexible glue material is injected into by the cast gate 12 In the die cavity 10 of the mould.Two exhaust passages are located at the both sides of the length direction of arch die joint 11 respectively.And And, one end of each exhaust passage is connected with the die cavity 10, and flexible glue material is produced in heating, process of injection molding Gas can discharge the die cavity 10 in time.For example shown in Fig. 1, two exhaust passages are located at the arch parting respectively Two side positions in the arc length direction of face 11 and connected with the die cavity 10.
The other end of the exhaust passage is in communication with the outside, and the gas in the mold cavity 10 is discharged.Preferably, Air processing unit can be provided with the external world, the one end of the exhaust passage away from the die cavity 10 can connect with air processing unit It is logical.For example, the one end of the exhaust passage away from the die cavity 10 can be connected with getter device, to produce suction.In another example, institute Stating the one end of exhaust passage away from the die cavity 10 can connect with emission-control equipment, to handle waste gas such as gas.
Afterwards, the melting flexible glue material stage injection such as TPU is entered in the die cavity 10 of the mould.In diverse location, melt soft Sizing material has different injection speed and injection pressure.When latter end is injected, the issuing velocity of melting flexible glue material is controlled in 10mm/s- 15mm/s。
After latter end injection certain time, melting is finally filled up in the end positions of the length direction of arch die joint 11 During plastic rubber material, in die cavity 10 of the melting flexible glue material full of the mould.Continuing melting flexible glue material being injected into the mould type During in chamber 10, the end positions of the arch die joint 11 finally just fill up melt plastic cement material.In such manner, it is possible to arrange in time Go out the gas of generation.
After die cavity 10 of the melting flexible glue material full of the mould, pressurize is carried out to mould.In such manner, it is possible to control product The size of deflection and size.It can prevent from melting backflow phenomenon caused by the reduction of flexible glue material temperature degree and its internal internal stress.
In this way, during continuing melting flexible glue material being injected into the mold cavity 10, the arch die joint 11 end positions finally just fill up melt plastic cement material.The exhaust passage will not be melted flexible glue material and block, the gas of generation It can in time be discharged, will not be remained in arch die cavity 10 by two exhaust passages.
Latter end injection speed is controlled in 10mm/s-15mm/s.Latter end injection speed will not be too fast, it is ensured that the gas energy of generation It is enough to be discharged in time by two exhaust passages, it will not remain in the die cavity 10 of the mould.
The gas produced in injection process can be discharged by two exhaust passages in time, will not remain in the mould In the die cavity 10 of tool, the forming defect of flexible glue arch product can be avoided.Meanwhile, it is capable to avoid the corrosion to mould, drop significantly Low mould maintenance and the maintenance frequency, add the actual life of mould.This kind of injection moulding process is simple to operate, easily add Work, additionally it is possible to reduce production cost.
In view of the raw material physical property and the particularity of arch product molding under molten condition, to pressurize rate request more Strictly.Alternatively, when carrying out pressurize to the mould, pressurize speed can be controlled in 4mm/s-10mm/s.In this way, pressurize is fast Degree will not be too fast, and product surface is not in the defect that flash is serious, size is unstable.Pressurize speed also will not be excessively slow, product Be not in be difficult to beat defect that is full, shrinking.
Because flexible glue arch article shape structure is complex, open defect is more, melting flexible glue material can at least divide four sections It is injected into the die cavity 10.For example, melting flexible glue material can divide five sections to be injected into the die cavity 10.
In the present invention, two exhaust passages respectively positioned at the length direction of arch die joint 11 two ends and also with The die cavity 10 is connected.The concrete structure and generation type of two exhaust passages can have a variety of.
In one example, with reference to Fig. 2, each exhaust passage may each comprise the row that one end is connected with the die cavity 10 Air drain 13.Each air discharge duct 13 is located at a side position of the arch die joint 11.When closing film, the air discharge duct 13 Opposite side is sealed, and only two ends are turned on.Wherein one end connects the die cavity 10.So, the gas produced in the die cavity 10 The air discharge duct 13 can be entered, to be discharged in time.
In this embodiment, with reference to Fig. 2, the exhaust passage can also include gas port 14.The one of the gas port 14 End is communicated in the air discharge duct 13, and the other end of the gas port 14 is communicated in the external world.The air discharge duct 13 passes through the air guide Hole 14 is in communication with the outside.For example, the gas port 14 can since the air discharge duct 13 mould described in break-through up to the external world Connection.
The aperture of the gas port 14 can be arranged to 5 millimeters.In such manner, it is possible to ensure that the exhaust passage can continue institute State the gas produced in die cavity 10 to discharge in time, gas residue is not had in the die cavity 10 of the mould.
In this embodiment, the mould may include fixed half and moving half.With reference to Fig. 2, the die cavity 10 may be disposed at described On cover half.The air discharge duct 13 may be disposed on the surface of the cover half.For example, the gas port 14 can run through the cover half Or dynamic model is to be in communication with the outside.
Certainly, a part of of the die cavity 10 can be arranged on cover half, and another part can be arranged on the dynamic model. In matched moulds, complete molding cavities 10 are formed.
Melting flexible glue material is injected into the die cavity 10 by the cast gate 12.The position of the cast gate 12 can have many Kind, as long as it can realize that melt plastic cement material finally fills up the end positions of the length direction of arch die joint 11.It is excellent Selection of land, with reference to Fig. 2, the cast gate 12 can include two side gates.Two side gates are arranged at the side of the die cavity 10 On surface.For example, the cross section of the side gate can rounded, rectangle or other shapes.In this way, being easily removed material handle, pour Mouth vestige is small, influences smaller to presentation quality.
When melting flexible glue material is injected into the die cavity 10, to enable melting flexible glue material more synchronously equably last It is filled in the two ends of the length direction of arch die joint 11.Further, with reference to Fig. 2, two side gates are located at described On arch die joint 11.Two side gates are uniformly distributed along the length direction of arch die joint 11.Pour two sides The length of the arch die joint 11 is divided into three sections by mouth.For example shown in Fig. 2, two side gates can be by the arch point The equal arc length in type face is three sections.So, melting flexible glue material more synchronously equably can finally be filled in the arch parting The two ends of the length direction of face 11.
Melting flexible glue material needs to be injected into the die cavity 10.Preferably, the injection moulding process is also provided with injector, So that melting flexible glue material is injected into the mold cavity 10.The concrete structure of the injector can use prior art.Institute Expects pipe can be included by stating injector.According to raw material physical property table, when melting flexible glue material is injected into the mold cavity 10, The temperature control of the barrel is at 210 DEG C -230 DEG C.For example, flexible glue material can be TPU flexible glue material.In order to avoid shaping flexible glue arch The surface of product occurs in serious flash, specific implementation process, and on the lower side limit that can try one's best in the temperature of the barrel is interval herein sets Put.
Although some specific embodiments of the present invention are described in detail by example, the skill of this area Art personnel are it should be understood that example above is merely to illustrate, the scope being not intended to be limiting of the invention.The skill of this area Art personnel to above example it should be understood that can modify without departing from the scope and spirit of the present invention.This hair Bright scope is defined by the following claims.

Claims (10)

1. a kind of flexible glue arch product injection moulding process, it is characterised in that including：
Mould is provided, the mould includes the die cavity (10) and arch die joint (11) for being used to be molded flexible glue arch product, The mould is provided with cast gate (12) and two exhaust passages, and two exhaust passages are located at the arch die joint respectively (11) both sides of length direction and connected with the die cavity (10)；
Melting flexible glue material stage injection is entered in the mold cavity (10), when latter end is injected, flexible glue material issuing velocity is melted Control is in 10mm/s-15mm/s；
When the end positions of arch die joint (11) length direction finally fill up melt plastic cement material, melting flexible glue material is full of The mold cavity (10)；
Pressurize is carried out to the mould.
2. flexible glue arch product injection moulding process according to claim 1, it is characterised in that pressurize is being carried out to the mould When, pressurize speed control is in 4mm/s-10mm/s.
3. flexible glue arch product injection moulding process according to claim 1, it is characterised in that the exhaust passage is away from described One end of die cavity (10) is connected with air processing unit.
4. flexible glue arch product injection moulding process according to claim 1, it is characterised in that the exhaust passage includes one end The air discharge duct (13) connected with the die cavity (10), the air discharge duct (13) is located at arch die joint (11) length direction One end.
5. flexible glue arch product injection moulding process according to claim 4, it is characterised in that the mould includes cover half and dynamic Mould, the die cavity (10) is arranged on the cover half, and the air discharge duct (13) is arranged on the cover half.
6. flexible glue arch product injection moulding process according to claim 4, it is characterised in that the exhaust passage also includes leading Stomata (14), the air discharge duct (13) is in communication with the outside by the gas port (14).
7. flexible glue arch product injection moulding process according to claim 6, it is characterised in that the aperture of the gas port (14) For 5 millimeters.
8. flexible glue arch product injection moulding process according to claim 1, it is characterised in that the cast gate (12) includes two Side gate.
9. flexible glue arch product injection moulding process according to claim 8, it is characterised in that two side gates are located at institute State on arch die joint (11), the length of the arch die joint (11) is divided into three sections by two side gates.
10. flexible glue arch product injection moulding process according to claim 1, it is characterised in that be also provided with injector, described Injector include expects pipe, will melting flexible glue material be injected into the mold cavity (10) it is interior when, the temperature control of the barrel exists 210℃-230℃。
CN201710598018.XA 2017-07-20 2017-07-20 Injection molding method of soft rubber arch product Active CN107297856B (en)

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Application Number Priority Date Filing Date Title
CN201710598018.XA CN107297856B (en) 2017-07-20 2017-07-20 Injection molding method of soft rubber arch product

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Application Number Priority Date Filing Date Title
CN201710598018.XA CN107297856B (en) 2017-07-20 2017-07-20 Injection molding method of soft rubber arch product

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CN107297856A true CN107297856A (en) 2017-10-27
CN107297856B CN107297856B (en) 2020-05-29

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019140825A1 (en) * 2018-01-19 2019-07-25 苏州汉扬精密电子有限公司 Soft rubber exhaust structure
CN111941724A (en) * 2020-07-24 2020-11-17 上海亚虹模具股份有限公司 Injection molding process for optimized flash of toilet cover of intelligent toilet

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05342644A (en) * 1992-06-05 1993-12-24 Fujitsu Ltd Apparatus and method for producing substrate for optical disk medium
JP2012081713A (en) * 2010-10-14 2012-04-26 Suzuki Motor Corp Foam molding die

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05342644A (en) * 1992-06-05 1993-12-24 Fujitsu Ltd Apparatus and method for producing substrate for optical disk medium
JP2012081713A (en) * 2010-10-14 2012-04-26 Suzuki Motor Corp Foam molding die

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019140825A1 (en) * 2018-01-19 2019-07-25 苏州汉扬精密电子有限公司 Soft rubber exhaust structure
CN111941724A (en) * 2020-07-24 2020-11-17 上海亚虹模具股份有限公司 Injection molding process for optimized flash of toilet cover of intelligent toilet

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Effective date of registration: 20201014

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