CN104369329B - Injection screw and application have the method for the injection machine molding copolymeric material of this screw rod - Google Patents
Injection screw and application have the method for the injection machine molding copolymeric material of this screw rod Download PDFInfo
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- CN104369329B CN104369329B CN201410604249.3A CN201410604249A CN104369329B CN 104369329 B CN104369329 B CN 104369329B CN 201410604249 A CN201410604249 A CN 201410604249A CN 104369329 B CN104369329 B CN 104369329B
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- screw rod
- melten gel
- melting cylinder
- injection
- rubber melting
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- 238000002347 injection Methods 0.000 title claims abstract description 52
- 239000007924 injection Substances 0.000 title claims abstract description 52
- 239000000463 material Substances 0.000 title claims abstract description 51
- 238000000465 moulding Methods 0.000 title claims abstract description 12
- 238000000034 method Methods 0.000 title claims description 13
- 229920001577 copolymer Polymers 0.000 title claims description 6
- 238000002844 melting Methods 0.000 claims abstract description 51
- 230000008018 melting Effects 0.000 claims abstract description 51
- 239000004926 polymethyl methacrylate Substances 0.000 claims abstract description 41
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims abstract description 40
- 239000003292 glue Substances 0.000 claims abstract description 23
- 239000002243 precursor Substances 0.000 claims abstract description 17
- 230000006835 compression Effects 0.000 claims description 13
- 238000007906 compression Methods 0.000 claims description 13
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- 239000000523 sample Substances 0.000 claims description 11
- 239000007787 solid Substances 0.000 claims description 10
- 238000010079 rubber tapping Methods 0.000 claims description 7
- 239000003999 initiator Substances 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 5
- 125000003003 spiro group Chemical group 0.000 claims description 4
- 101150030817 HPT1 gene Proteins 0.000 claims description 3
- 101100462124 Oryza sativa subsp. japonica AHP1 gene Proteins 0.000 claims description 3
- 238000012856 packing Methods 0.000 claims description 3
- 238000001746 injection moulding Methods 0.000 abstract description 20
- 239000012778 molding material Substances 0.000 abstract description 10
- 239000000843 powder Substances 0.000 abstract description 8
- 238000006116 polymerization reaction Methods 0.000 abstract description 7
- 238000002834 transmittance Methods 0.000 abstract description 3
- 229920003023 plastic Polymers 0.000 description 7
- 239000004033 plastic Substances 0.000 description 7
- 239000002994 raw material Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- UICXTANXZJJIBC-UHFFFAOYSA-N 1-(1-hydroperoxycyclohexyl)peroxycyclohexan-1-ol Chemical compound C1CCCCC1(O)OOC1(OO)CCCCC1 UICXTANXZJJIBC-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
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- 229920005989 resin Polymers 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
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- 229920005479 Lucite® Polymers 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 206010039251 Rubber sensitivity Diseases 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 229920006125 amorphous polymer Polymers 0.000 description 1
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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
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/58—Details
- B29C45/60—Screws
-
- 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
- B29C45/20—Injection nozzles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/78—Measuring, controlling or regulating of temperature
-
- 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
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/58—Details
- B29C45/60—Screws
- B29C2045/605—Screws comprising a zone or shape enhancing the degassing of the plastic 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
- B29C2945/76003—Measured parameter
- B29C2945/7604—Temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76494—Controlled parameter
- B29C2945/76531—Temperature
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The present invention relates to a kind of injection screw, including rubber melting cylinder, melten gel screw rod, rubber melting cylinder precursor, cross glue head and nozzle, rubber melting cylinder has cavity through before and after, melten gel screw rod is movably set in the cavity of rubber melting cylinder, the rear portion of melten gel screw rod has the semi-enclosed air discharge duct of hoop, is positioned on the melten gel screw rod of described air discharge duct rear end the bubble expellant gas discharge portion formed in air discharge duct；The fineness of melten gel screw surface is 0.1～0.12.Bubble in injection molding material can be discharged by semi-enclosed air discharge duct, but the powder that simultaneously will not produce with bubble again is discharged, it is to avoid screw rod presses down the friction between the screw rod caused and injection molding material, it is ensured that the stability of product quality；Higher fineness can effectively reduce screw rod to the friction on moulding surface and scuffing.The PC MBS PMMA ternary polymerization height light transmissive material transmittance that the injection moulding process of the present invention obtains can reach 90%.
Description
Technical field
The present invention relates to the injection molding technology field in injection molding technology field, especially ternary polymerization height light transmissive material,
Refer specifically to a kind of injection screw and application has the method for injection machine molding copolymeric material of this screw rod.
Background technology
In modernization industry and daily product, more and more plastics replace glass, are especially applicable to optical instrument and bag
Dress industrial aspect, it is desirable to the transparency of material is high, wearability is good, toughness is strong.Conventional transparent material master in plastics
PMMA, PC and PET to be included, wherein, PMMA is amorphous polymer, is commonly called as lucite, its transparency
High, thermostability is preferable, compared with PS, is difficult to embrittlement, but PMMA surface hardness is low, easily scratched by hard thing and stay
Lower vestige, and the molding mobility of PMMA is poor, and melt viscosity is more sensitive to the change of temperature, causes PMMA
Molding difficulty is big, conforming product rate is low.
Authorization Notice No. is Chinese utility model patent " a kind of universal injection of high-efficiency injection molding machine of CN200939686Y
Screw rod " (application number: 200520133840.1) disclose a kind of structure, and it is designed to by melting in the melt zone of screw rod
The separation barrier type structure that section main thread and melt zone deputy thread and melt zone solid groove and melt zone melt tank are constituted, and
Groove depth in this section is designed to positive and negative knockdown geometrical compression ratio, and to ginsengs such as the draw ratio of screw rod and three segment length ratios
Number is optimized, so that screw rod can adapt to the processing of multiple plastics, and reaches the high and low energy consumption of transfer rate, plasticizing energy
Power waits by force requirement.But, for high viscosity, high light transmissive material PMMA, due to it in screw rod internal mobility relatively
Difference, uses the screw rod of said structure, and raw material is easily rubbed in screw rod and scratches, it is impossible to meet injection requirement.Authorize public affairs
Accuse number Chinese utility model patent being CN202491386U " a kind of high viscosity injection molding bolt special head " (Shen
Please number: 201220051851.5) disclose a kind of injection structure being specifically designed to PMMA, it includes that screw rod head enters
Glue part, reverse stopping ball, installation thread and screw rod head plastic emitting part, screw rod head enters glue part with screw rod head plastic emitting part by installing thread
Connect into a screw rod head with inverse-stopping functions, owing to non-return piece does not results in shear effect, open and close rapid flexible, tool
Have that boosting is fast, injection volume accurately, the feature of length in service life, it is contour that the most above-mentioned screw rod head is particularly well-suited to PMMA
The precision injection molding of viscosity material.But, owing to PMMA melt viscosity is very sensitive to the perception of variations in temperature,
Need to strictly control the temperature of nozzle, and the screw rod head of said structure cannot realize this function, be easily caused the note of PMMA
Mould quality unstable.
General classic screw uses 38CRMOAL material to make, and its fineness is up to 0.8, easily moulds PMMA
Materials and parts cause friction and scratch, and have a strong impact on the transparency of PMMA working of plastics.Further, in order to discharge in PMMA material
Bubble, typically offer air discharge duct at spiro rod rear end, air discharge duct of the prior art be generally from spiro rod rear end to external spiral
The all-pass formula air discharge duct formed, its groove footpath is about 2.5mm, uses such air discharge duct, while discharging bubble,
The powder that simultaneously can produce with bubble is discharged, and after a period of time, easily causes and presses under screw rod, in turn results in screw rod and injection
Friction between material, has a strong impact on the quality of product.
Summary of the invention
First to be solved by this invention technical problem is that the present situation for prior art, it is provided that one can effectively reduce note
The friction of plastics and scuffing, it is specifically designed to the injection screw of high viscosity injection molding.
Second solved by the invention technical problem is that the present situation for prior art, it is provided that a kind of application has above-mentioned injection
The method of the injection machine molding copolymeric material of screw rod, utilizes the PC-MBS-PMMA ternary polymerization material of the method molding
Material transmittance is up to 90%.
The present invention solves the technical scheme that above-mentioned first technical problem used: a kind of injection screw, including rubber melting cylinder,
Melten gel screw rod, rubber melting cylinder precursor, excessively glue head and nozzle, described rubber melting cylinder has cavity the most through before and after, described melten gel
Screw rod is movably set in the cavity of rubber melting cylinder, and the described rear end of rubber melting cylinder precursor is connected with the front end of rubber melting cylinder, described
The front end of the rear end and melten gel screw rod of crossing glue head is connected, and the rear end of described rubber melting cylinder precursor is formed and crosses glue head front end phase
The groove of coupling, described nozzle is connected to the front end of rubber melting cylinder precursor, it is characterised in that: the rear portion of described melten gel screw rod is opened
Have the semi-enclosed air discharge duct of hoop, the cross section of this air discharge duct be shaped to from the outside to the core semicircle arcuation and with melten gel screw rod table
The thread groove in face is connected, and is positioned on the melten gel screw rod of described air discharge duct rear end and forms for the bubble discharge in air discharge duct
Gas discharge section；The fineness of described melten gel screw surface is 0.1～0.12.
As a further improvement on the present invention, described gas discharge section is the inclination being connected with air discharge duct on melten gel screw rod
Face, the distance of the front end of this inclined plane to rubber melting cylinder inwall is 0.25～0.35mm, preferably 0.3mm, this inclined plane
Rear end be 0.45～0.55mm to the distance of rubber melting cylinder inwall, preferably 0.5mm.Select above-mentioned parameter scope, with
Make bubble to discharge smoothly, and be avoided that the powder simultaneously produced with bubble is discharged, in order to avoid powder accumulation causes under screw rod
Pressure in turn results in the friction between screw rod and injection molding material, it is ensured that the stability of product quality.
Further, the outer end width of described air discharge duct is 3.5～4.5mm, preferably 4mm.
In above-mentioned each scheme, described melten gel screw rod uses HPT1 material to make, and its fineness reaches 0.1～0.12,
Avoid the friction to PMMA moulding and scuffing, it is ensured that the quality of injecting products.
Described melten gel screw rod includes interconnective metering section, compression section and solid conveying section from front to back, and described molten
The spiral shell rib width of glue screw rod is gradually reduced from front to back.Due to the poor fluidity of the high-viscosity materials such as PMMA, impact
Bad, use said structure, to meet the injection requirement of high-viscosity material.
Improve further, 0.08～0.12 times that spiral shell rib width is melten gel screw diameter of described melten gel spiro rod rear end, excellent
Elect 0.1 times as；0.13～0.19 times that spiral shell rib width is melten gel screw diameter of described melten gel screw front end, preferably 0.16
Times；The draw ratio of described rubber melting cylinder is (20～21.5): 1.The length of described metering section, compression section and solid conveying section it
Ratio is 3:(8～9): (9～10), preferably 3:8:9.Metering section is mainly the molecule homogenizing to melt and temperature homogenisation,
And melt resistance is stoped backflow, steady pressure, based on shear flow；If metering section is too short, it is easily caused melt homogenization
Bad, if metering section is long, shear time can be increased, cause melt overheat.The fusion range of PMMA material is wider,
Use long compression section that plasticizing energy can be made to convert gentleness, make PMMA material be completely in molten condition；If compression section
Too short, solid material fails to melt completely, may cause blocking to metering section；If compression section is long extends material thermal history,
Easily affect transfer efficiency, be likely to result in melt overheat or even decomposition simultaneously.Above-mentioned preferred parameter avoids going out of the problems referred to above
Existing, can ensure that screw rod has certain conveying capacity simultaneously, meet plasticizing requirement.
As preferably, it is provided with one between described outer surface and the inner surface of rubber melting cylinder crossing glue head and crosses cushion rubber, and, should
The rear portion crossing cushion rubber is formed with the ring surface of an inclination, and the internal diameter of this ring surface is gradually increased from front to back.This ring surface can
To increase cushion rubber sensitivity in plasticizing and injecting phase, it is ensured that the precision of injection.
Preferably, crossing on rear side of described cushion rubber excessively is provided with one and crosses rubber gasket between glue head outer surface and rubber melting cylinder inner surface.
Improving further, what the described nozzle groove that offer with rubber melting cylinder precursor corresponding with on rubber melting cylinder precursor was connected goes out
Material passage, described nozzle is provided with, near tapping channel, the probe that can detect drop temperature.Have at least on described nozzle
Two temperature controlling groove, two temperature controlling groove are respectively symmetrically the both sides being distributed in nozzle, and described probe is arranged in above-mentioned temperature controlling groove.
Owing to PMMA melt viscosity is more sensitive to variations in temperature, variations in temperature is very big to the qualitative effects of injecting products, because of
This, the present invention uses the open type nozzle of a diameter of 3.5mm, and arranges probe on nozzle, by probe to discharging
The temperature moment of passage is detected, and maintains the temperature of tapping channel to keep stable within the specific limits, to guarantee injection
The stability of product quality.
The present invention solves the technical scheme that above-mentioned second technical problem used: a kind of application has above-mentioned injection screw
The method of injection machine molding copolymeric material, it is characterised in that comprise the following steps:
(1) the mixing material of PMMA, PC and MBS is dried at 80～100 DEG C 3～5h, in mixing material,
PC accounts for the 20～25% of total material weight, and MBS accounts for the 10～15% of total material weight, and remainder is PMMA；
Dried mixing material and radical initiator are placed in injection machine；
(2) parameter of setting injection machine:
Injection time 3～5s, the dwell time 20～40s, dwell pressure 40～55MPa, cool time 25～35s,
Mold temperature 45～65 DEG C；
Control the metering section of rubber melting cylinder simultaneously and solid conveying section temperature be 250～270 DEG C, compression section temperature be 260～
270 DEG C, the speed setting of screw rod is 15～30r/min；
Utilize probe to detect the temperature of nozzle at any time, and make the temperature of nozzle control between 245～265 DEG C.
The weight of described radical initiator is the 0.3%～1.5% of mixing material gross weight, described radical initiator
For cyclohexanone peroxide.
Compared with prior art, it is an advantage of the current invention that:
(1) for PMMA material, it has preferable hydrophilic, easily absorb the steam in air and
Causing resin portion to hydrolyze, hydrolytic process can produce bubble, and the existence of bubble has a strong impact on the transparency of injecting products,
In order to improve the transparency of product, it is generally required to the bubble in injection raw material is got rid of, in prior art, typically adopt
With the air discharge duct of all-pass formula, such structure can be while discharging bubble, the powder discharge that simultaneously will produce with bubble,
After a period of time, easily cause the friction that screw rod is pressed down, in turn resulted between screw rod and injection molding material, affect the quality of product；
And the present invention has offered the semi-enclosed air discharge duct of hoop at the rear portion of melten gel screw rod, the melten gel screw rod at air discharge duct rear portion has
The overall structure having the gradual change inclined plane discharged for bubble, air discharge duct and inclined plane makes the gap width of screw rod and air contact
It is only 0.3mm, such structure, the bubble in injection molding material can be discharged, but will not will produce with bubble again simultaneously
Raw powder discharges, it is to avoid screw rod presses down the friction between the screw rod caused and injection molding material, it is ensured that product quality steady
Qualitative；
(2) the melten gel screw rod in the present invention use high-wearing feature material, the fineness of melten gel screw surface reach 0.1～
0.12, can effectively reduce screw rod to the friction on moulding surface and scuffing, it is ensured that the quality of injecting products.
(3) injection moulding process of the present invention is without carrying out copolyreaction by PMMA, PC and MBS before injection, but
Add in injection machine after directly the raw material of PMMA, PC and MBS being mixed, realize in injection moulding process PMMA,
Copolymerization between PC and MBS, obtains PC-MBS-PMMA ternary polymerization height light transmissive material, the letter of the method step
Single, it is simple to industrialized production, the transmittance of resulting materials can reach 90%.
Accompanying drawing explanation
Fig. 1 is the structural representation of melten gel screw rod in the embodiment of the present invention；
Fig. 2 is the sectional view of the embodiment of the present invention；
Fig. 3 is the structure for amplifying schematic diagram of part A in Fig. 1；
Fig. 4 is the structure for amplifying schematic diagram of part B in Fig. 2；
Fig. 5 is the structure for amplifying schematic diagram of C portion in Fig. 2；
Fig. 6 is the structural representation of nozzle in Fig. 2.
Detailed description of the invention
Below in conjunction with accompanying drawing embodiment, the present invention is described in further detail.
As shown in figs. 1 to 6, the injection screw of the present embodiment include rubber melting cylinder 1, melten gel screw rod 2, rubber melting cylinder precursor 3,
Crossing glue head 4 and nozzle 5, rubber melting cylinder 1 has cavity through before and after, and melten gel screw rod 2 is movably set in rubber melting cylinder 1
Cavity in, the rear end of rubber melting cylinder precursor 3 by trip bolt 100 locking be connected on rubber melting cylinder 1 front end face, melten gel
It is logical that the front end connection of cylinder precursor 3 has correspondence on nozzle 5, rubber melting cylinder precursor 3 and nozzle 5 to offer the discharging being interconnected
Road 200.Cross glue head 4 to be arranged in rubber melting cylinder 1, cross glue head 4 rear end and be connected with the front end of melten gel screw rod 2, cross glue
4 front ends are shaped to cone, and the rear end of rubber melting cylinder precursor 3 is formed with and crosses the groove 31 that glue head 4 front end matches,
The rear end of tapping channel 200 is connected with groove 31；Cross and set between the outer surface of glue head 4 and the inner surface of rubber melting cylinder 1
Be equipped with one cross cushion rubber 6, and, this rear portion crossing cushion rubber 6 is formed with the ring surface of an inclination, this ring surface interior without leave
Being gradually increased after forward direction, this ring surface can increase the cushion rubber 6 sensitivity in plasticizing and injecting phase, it is ensured that injection
Precision.In order to increase the sealing between glue head 4 and mistake cushion rubber 6, cross glue head 4 outer surface excessively on rear side of cushion rubber 6
And it is provided with one between rubber melting cylinder 1 inner surface and crosses rubber gasket 7.
In the present embodiment, the rear portion of melten gel screw rod 2 has the semi-enclosed air discharge duct 21 of two hoops being connected,
The cross section of this air discharge duct 21 is shaped to semicircle arcuation from the outside to the core, and the outer end width of air discharge duct 21 is 4mm, melten gel
The air discharge duct 21 of screw rod 2 upper left side is connected with the end of melten gel screw rod 2 thread surface groove 20, is positioned at air discharge duct 21
Form on the melten gel screw rod 2 of rear end for the bubble expellant gas discharge portion 10 in air discharge duct 21；In the present embodiment
Gas discharge section 10 is the inclined plane being connected with air discharge duct 21 rear end on melten gel screw rod 2, and the front end of this inclined plane is to molten
The distance of packing element 1 inwall is 0.3mm, and the distance of the rear end of this inclined plane to rubber melting cylinder 1 inwall is 0.5mm.For
For PMMA material, it has preferable hydrophilic, easily absorbs the steam in air and causes resin portion water
Solving, hydrolytic process can produce bubble, and the existence of bubble has a strong impact on the transparency of injecting products, in order to improve product
Transparency, it is generally required to the bubble in injection raw material is got rid of, in prior art, the general aerofluxus using all-pass formula
Groove, such structure can be while getting rid of bubble, the powder discharge that simultaneously will produce with bubble, after a period of time, easily
The friction causing screw rod to press down, in turn result between screw rod and injection molding material, affects the quality of product；And the present embodiment is adopted
With the semi-enclosed air discharge duct 21 of above-mentioned parameter, air discharge duct 21 makes screw rod and air contact with the overall structure of inclined plane
Gap width is only 0.3mm, can be discharged by the bubble in injection molding material, but the powder that will not simultaneously will produce with bubble
End is discharged, it is to avoid screw rod presses down the friction between the screw rod caused and injection molding material, it is ensured that the stability of product quality.
Melten gel screw rod 2 uses HPT1 material to make, and the fineness on melten gel screw rod 2 surface is 0.1, can effectively reduce screw rod
Friction and scuffing to moulding surface, it is ensured that the quality of injecting products.
As it is shown in figure 1, rubber melting cylinder 1 includes interconnective metering section 12, compression section 13 and Solid Conveying and Melting from front to back
Section 14, and the spiral shell rib width of melten gel screw rod 2 is gradually reduced from front to back.The spiral shell rib width of melten gel screw rod 2 rear end is melten gel
0.1 times of screw diameter D；0.16 times that spiral shell rib width is melten gel screw diameter D of melten gel screw rod 2 front end；Melten gel
The draw ratio of cylinder 1 is 21.5:1；The length ratio of metering section 12, compression section 13 and solid conveying section 14 is 3:8:9.
Due to the poor fluidity of the high-viscosity materials such as PMMA, impact is bad, uses said structure, to meet high viscosity thing
The injection requirement of matter.
In the present embodiment, nozzle 5 is provided with, near tapping channel 200, the probe that can detect drop temperature.Concrete,
Having two temperature controlling groove 51 on nozzle 5, two temperature controlling groove 51 are respectively symmetrically the both sides being distributed in nozzle 5, and probe is arranged
In temperature controlling groove 51.Owing to PMMA melt viscosity is more sensitive to variations in temperature, the variations in temperature product to injecting products
Greatly, therefore, the present embodiment uses the open type nozzle of a diameter of 3.5mm, and arranges spy on nozzle 5 in matter impact
Pin, is detected the temperature moment of tapping channel 200 by probe, and maintains the temperature of tapping channel 200 necessarily
In the range of keep stable, to guarantee the stability of injecting products quality.
Application has the injection machine of the injection screw of the present embodiment to note PC-MBS-PMMA ternary polymerization height light transmissive material
Molded method comprises the following steps:
(1) the mixing material of PMMA, PC and MBS being dried at 85 DEG C 3h, in mixing material, PC accounts for
The 20～25% of total material weight, MBS accounts for the 10～15% of total material weight, and remainder is PMMA；To be dried
After mixing material and radical initiator be placed in injection machine；
(2) set injection machine parameter: injection time 3s, dwell time 30s, dwell pressure 50MPa, cooling time
Between 26s, mold temperature 65 DEG C；The metering section and the solid conveying section temperature that control rubber melting cylinder are 255 DEG C, compression section simultaneously
Temperature is 265 DEG C, and the speed setting of screw rod is 22r/min；Utilize probe to detect the temperature of nozzle at any time, and make nozzle
Temperature control between 245～265 DEG C.
Radical initiator in step (1) is cyclohexanone peroxide, its weight be mixing material gross weight 0.3%～
1.5%.
The injection moulding process of the present embodiment without carrying out copolyreaction before injection by PMMA, PC and MBS, but directly
Connect and add in injection machine after the raw material of PMMA, PC and MBS is mixed, realize in injection moulding process PMMA,
Copolymerization between PC and MBS, obtains PC-MBS-PMMA ternary polymerization height light transmissive material, the letter of the method step
Single, it is simple to industrialized production.After testing, said method is used to be molded the PC-MBS-PMMA ternary polymerization obtained
High light transmissive material, its light transmission is maintained at more than 90%.
Claims (10)
1. an injection screw, including rubber melting cylinder, melten gel screw rod, rubber melting cylinder precursor, crosses glue head and nozzle, described molten
Packing element has cavity through before and after, and described melten gel screw rod is movably set in the cavity of rubber melting cylinder, before described rubber melting cylinder
The rear end of body is connected with the front end of rubber melting cylinder, and the described rear end crossing glue head is connected with the front end of melten gel screw rod, described molten
The rear end of packing element precursor is formed and crosses the groove that glue head front end matches, before described nozzle is connected to rubber melting cylinder precursor
End, it is characterised in that: the rear portion of described melten gel screw rod has the semi-enclosed air discharge duct of hoop, the cross section of this air discharge duct
It is shaped to semicircle arcuation from the outside to the core and the thread groove with melten gel screw surface is connected, be positioned at the molten of described air discharge duct rear end
Form on glue screw rod for the bubble expellant gas discharge portion in air discharge duct；The fineness of described melten gel screw surface is
0.1～0.12.
Injection screw the most according to claim 1, it is characterised in that: described gas discharge section is melten gel screw rod
The upper inclined plane being connected with air discharge duct, the distance of the front end of this inclined plane to rubber melting cylinder inwall is 0.25～0.35mm,
The rear end of this inclined plane is 0.45～0.55mm to the distance of rubber melting cylinder inwall.
Injection screw the most according to claim 2, it is characterised in that: the outer end width of described air discharge duct be 3.5～
4.5mm。
Injection screw the most according to claim 2, it is characterised in that: described melten gel screw rod uses HPT1 material
Make.
Injection screw the most according to claim 3, it is characterised in that: described rubber melting cylinder includes phase from front to back
Metering section, compression section and the solid conveying section connected, and the spiral shell rib width of described melten gel screw rod is gradually reduced from front to back；
0.08～0.12 times that spiral shell rib width is melten gel screw diameter of described melten gel spiro rod rear end, the spiral shell of described melten gel screw front end
Rib width is 0.13～0.19 times of melten gel screw diameter.
Injection screw the most according to claim 5, it is characterised in that: the draw ratio of described rubber melting cylinder is (20～21.5):
1；The length ratio of described metering section, compression section and solid conveying section is 3:(8～9): (9～10).
7. according to the injection screw described in any claim in claim 1～6, it is characterised in that: described glue head excessively
Outer surface and the inner surface of rubber melting cylinder between be provided with one cross cushion rubber, and, this rear portion crossing cushion rubber is formed with an inclination
Ring surface, the internal diameter of this ring surface is gradually increased from front to back.
Injection screw the most according to claim 7, it is characterised in that: the glue head appearance excessively on rear side of described cushion rubber excessively
It is provided with one between face and rubber melting cylinder inner surface and crosses rubber gasket.
9. according to the injection screw described in any claim in claim 1～6, it is characterised in that: described nozzle with
On rubber melting cylinder precursor, correspondence offers the tapping channel that the groove with rubber melting cylinder precursor is connected, near discharging on described nozzle
Passage is provided with the probe that can detect drop temperature.
10. an application is had the right the method for injection machine molding copolymeric material of injection screw of requirement 9, it is characterised in that
Comprise the following steps:
(1) the mixing material of PMMA, PC and MBS is dried at 80～100 DEG C 3～5h, in mixing material,
PC accounts for the 20～25% of total material weight, and MBS accounts for the 10～15% of total material weight, and remainder is PMMA；
Dried mixing material and radical initiator are placed in injection machine；
(2) parameter of setting injection machine:
Injection time 3～5s, the dwell time 20～40s, dwell pressure 40～55MPa, cool time 25～35s,
Mold temperature 45～65 DEG C；
Control the metering section of rubber melting cylinder simultaneously and solid conveying section temperature be 250～270 DEG C, compression section temperature be 260～
270 DEG C, the speed setting of screw rod is 15～30r/min；
Utilize probe to detect the temperature of nozzle at any time, and make the temperature of nozzle control between 245～265 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410604249.3A CN104369329B (en) | 2014-10-31 | 2014-10-31 | Injection screw and application have the method for the injection machine molding copolymeric material of this screw rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410604249.3A CN104369329B (en) | 2014-10-31 | 2014-10-31 | Injection screw and application have the method for the injection machine molding copolymeric material of this screw rod |
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| CN104369329A CN104369329A (en) | 2015-02-25 |
| CN104369329B true CN104369329B (en) | 2016-09-28 |
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| CN105196502B (en) * | 2015-10-28 | 2018-05-01 | 武汉理工大学 | A kind of cellular plastic is injection moulded screw rod |
| CN109605698A (en) * | 2018-12-13 | 2019-04-12 | 苏州金研光电科技股份有限公司 | A kind of production technology of VCM motor parts carrier |
| CN113231216B (en) * | 2021-06-06 | 2024-07-26 | 际华三五一四制革制鞋有限公司 | Multicomponent polymer mixed spiral jet device |
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| JP4676479B2 (en) * | 2007-12-05 | 2011-04-27 | 株式会社名機製作所 | Exhaust device for heating cylinder in injection molding machine |
| CN202114885U (en) * | 2011-06-09 | 2012-01-18 | 广东伊之密精密机械股份有限公司 | Injection device of injection molding machine |
| CN203210638U (en) * | 2012-11-13 | 2013-09-25 | 泽郎格西 | Injection molding machine provided with air exhausting function |
| CN203236679U (en) * | 2013-05-07 | 2013-10-16 | 谭文玉 | Vacuum charging barrel system for injection molding machine |
| CN203863961U (en) * | 2014-05-15 | 2014-10-08 | 阮祺 | Melt glue injection device for injection molding machine |
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Address after: 315400 Simen Town Industrial Park, Yuyao City, Zhejiang Province Patentee after: Ningbo Chuangji Machinery Co.,Ltd. Address before: 315400 Simen Town Industrial Park, Yuyao City, Zhejiang Province Patentee before: NINGBO LOG MACHINERY Co.,Ltd. |