CN101708645A - Injection molding machine for forming long fiber reinforced plastics - Google Patents
Injection molding machine for forming long fiber reinforced plastics Download PDFInfo
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- CN101708645A CN101708645A CN200910155054A CN200910155054A CN101708645A CN 101708645 A CN101708645 A CN 101708645A CN 200910155054 A CN200910155054 A CN 200910155054A CN 200910155054 A CN200910155054 A CN 200910155054A CN 101708645 A CN101708645 A CN 101708645A
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Abstract
The invention discloses an injection molding machine for forming long fiber reinforced plastics, which comprises a machine barrel with a nozzle, a screw with a check ring in the machine barrel, and a hopper used for supplying a raw material to the machine barrel; the screw consists of a feeding section, a compressing section and a metering section; and the length distribution of the various sections in the screw is that: the feeding section is 40 to 55 percent, the compressing section is 25 to 40 percent and the metering section is 15 to 25 percent. The injection molding machine can form the long fiber reinforced plastics of which the particle length is between 8 and 25mm through injection molding, and maintains fiber length of injection molding parts better under the condition of ensuring the condition of full plasticization compared with a common injecting molding machine, so the advantages of the long fiber reinforced plastics can be played and the performance of the products is further improved.
Description
Technical field
The present invention relates to macromolecular material former field, be specifically related to a kind of injection-moulding device that is used for forming long fiber reinforced plastics.
Background technology
In recent years, along with the enforcement of policies such as energy-saving and emission-reduction, automobile lightweight, the consumption sharp increase of long fiber reinforced plastics.Long fiber reinforced plastics possesses high rigidity, high tenacity and advantage such as fatigue durability preferably, can be used as the material of structure or half hitch member, comes traditional materials such as alternative metals, thermosetting resin.
In article of fiber reinforced plastics, the draw ratio of fiber will directly influence final performance.Gupta VB etc. points out when fibre reinforced plastics are subjected to certain load, can be pulled out less than the fiber of critical length (Lo), and the intensity of fiber self just can not be brought into play fully.Therefore in order to make fiber in plastic products, play the effect that improves intensity better, must keep fibre length as much as possible.Fiber long in the long fiber reinforced plastics can also form three-dimensional fiber network structure, when being subjected to external force, goods do the time spent, overlap joint makes part stress directly transmit in fiber reinforcement with the fiber that intersects mutually, rather than transmit between resin-fiber-resin, thereby further improve the mechanical property of goods.
U.S. Pat 5773042 discloses a kind of online compounding forming long fiber reinforced thermoplastics (LFT-D) equipment with US6159589, this equipment the is integrated moulding section of raw-material premix part such as resin, fiber with goods.Adopt one step processing, it is fast to have speed, low power consumption and other advantages, but bigger integrated level makes that specification of equipment is single, involves great expense, and when the undersized goods of moulding, can not show its advantage.Therefore, the more common at present two-step method that remains promptly makes long fibre reinforced thermoplastics pellet (LFT-G) earlier, again by method moulding such as mold pressing or injection mouldings.With respect to other forming methods, it is little that injection mo(u)lding possesses energy consumption, the production efficiency height, and advantages such as plastic the part with complicated structure, the manufacturer extensively adopts by plastic products, and the injection-moulding device of therefore studying long fibre reinforced thermoplastics pellet is of universal significance more.
In order to promote the mechanical property of long fiber reinforced plastics goods, all to keep fibre length as far as possible in the preparation and the injection phase of pellet (LFT-G).The fibre length of LGF-G particle is consistent with particle size, is generally 8-25mm.In injection moulding process, stage such as preformed, injection all is easy to cause fibre damage, reduce fibre length, this damage is mainly derived from the friction between fiber and the fiber, the collision of fiber and barrel wall, screw rod, molten resin flows process to the shearing of fiber, and non-return passage, injection nozzle are to the factors such as destruction of fibre length.Except adjusting process, as the rising temperature, reduce methods such as injection speed, the structure and the parameter that change injection-moulding device itself can more obvious minimizing glass damages.Therefore, develop and a kind ofly can guarantee long fiber reinforced plastics in injection machine fully under the condition of plasticizing, the injection moulding machine less to fibre damage can promote the mechanical property of long fiber reinforced plastics goods greatly.
Summary of the invention
The objective of the invention is to make injection machine in the process of forming long fiber reinforcing material, reach the minimizing fibre damage, keep the effect of product properties by adjusting the part-structure of injection machine.
A kind of injection-moulding device that is used for forming long fiber reinforced plastics, comprise the hopper that has the screw rod of check ring and be used for supplying raw material in the machine barrel of being with nozzle, the machine barrel to machine barrel, described screw rod is made up of for three sections feeding section, compression section and metering section, and the distribution of lengths of each section in screw rod is:
Feeding section L1 40～55%;
Compression section L2 25～40%;
Metering section L3 15～25%.
The electric control system of injection-moulding device of the present invention, Machinery Control System etc. can adopt prior art.
The feed opening cross section that described hopper is communicated with machine barrel can be the circle of diameter 80～100mm or the square of the length of side 80～100mm, can utilize from reentering the screw rod feeding zone to guarantee the long particle of 8～25mm, can not form arch formation.
Be accompanied by the rotation of screw rod, the particle that falls in the hopper is constantly pushed ahead, and the resin in the particle is subjected to high temperature action fusion gradually in machine barrel, and fiber begins directly to contact with parts such as injection moulding machine barrel, screw rods.Fibre reinforced plastics derive from the broken end of fiber to the wearing and tearing of former very major part, and with respect to short fiber reinforced plastics, the long fiber reinforced plastics of same fiber content has broken end still less, but still can not ignore the wearing and tearing of screw rod and machine barrel.For reducing the wearing and tearing of fiber, influence molding effect to screw rod and machine barrel.The machine barrel of injection-moulding device, screw rod, nozzle etc. all must adopt alloy material with the assembly that the long fiber reinforced plastics melt directly contacts.Described alloy can be 38CrMoAla, Cr12MoV, 4Cr5MoSiV1 etc.
The screw-rod structure of injection-moulding device to the time of staying, the plasticizing rate of material of long fiber reinforced plastics in heating environment, the shear strength of molten plastic all has conclusive effect, is one of principal element that influences fibre length in the goods.
As preferably, described screw rod feeding section, compression section and the distribution of lengths of metering section in screw rod are:
Feeding section L1 40～45%;
Compression section L2 35～40%;
Metering section L3 20%.
As further preferred, described screw rod feeding section, compression section and the distribution of lengths of metering section in screw rod are:
Feeding section L1 40%;
Compression section L2 40%;
Metering section L3 20%.
Select suitable feeding section, compression section and metering section distribution of lengths more to help keeping the length of fortifying fibre in the goods, improve product properties.
Described screw rod tooth pitch (pitch) s is 1D-1.5D, and D is a Major Diam.
Deepen the damage that screw channel can reduce fortifying fibre, but screw channel being crossed problems such as deeply also can causing the material variable color, is 5～9mm as the spiral groove depth h1 of preferred screw rod feeding section of the present invention; The spiral groove depth h3 of metering section is 2～5mm, can take into account problems such as avoiding fibre damage and material variable color like this.
The core diameter of thread that screw rod feeding Duan Youyi of the present invention is fixing is tapered metering section gradually by footpath at the bottom of the gradual change of compression section, and metering section has footpath at the bottom of the bigger retaining thread.
Bigger screw slenderness ratio all is beneficial to the uniformity of plasticizing effect and melt temperature, but for the reservation of fiber destruction is arranged but, as preferably, and the draw ratio L/D=of screw rod of the present invention (16～22): 1,
Compression ratio ε=the h1/h3 of described screw rod can be in (1.8～2.5): changes between 1, and as preferably, compression ratio ε=h1/h3=(2.0～2.5): 1.Bigger compression ratio is set up melt pressure and is all played a very important role the compacting fused materials.
The head of screw rod must be guaranteed smooth, and sharp-pointed turning can not be set.Near the screw head check ring adopts non-ball-valve type, and when the injection screw check ring is opened, and the spacing between the screw head guarantees that greater than 5mm melt can be unblocked at screw head.
Described machine barrel outer surface coats cast aluminium, cast copper heat block, or adopts electromagnetic heating method.Uneven for eliminating radially heating, heat block and machine barrel outer surface must fit tightly, and reduce the slit of heat block junction as far as possible.
The junction of described nozzle and machine barrel is that arc is excessive, nozzle the bore at thin place greater than 5mm.
Emphasis of the present invention is that the screw-rod structure to injection-moulding device improves, and can suitably adjust according to concrete goods about technological parameters such as pressure in the injection moulding process and speed.
Injection-moulding device of the present invention can the injection mo(u)lding particle length be the long fiber reinforced plastics of 8-25mm, compare with common injection machine and to guarantee to have kept the fibre length in the moulding preferably under the condition that plastics fully plastify, thereby can bring into play the advantage of long fiber reinforced plastics, make the performance of product obtain promoting further.
Description of drawings:
Fig. 1 is an injection-moulding device screw rod partial schematic diagram of the present invention;
Fig. 2 a is the glass staple diagram in the injection-moulding device moulding batten ash of the present invention;
Fig. 2 b is the glass staple diagram in the common injection-moulding device moulding batten ash.
The specific embodiment
Embodiment 1
Referring to Fig. 1, the hopper bore diameter of injection-moulding device is 80mm, screw slenderness ratio L/D=20, feeding section L1, compression section L2, metering section L3 account for 40%, 40%, 20% of screw rod total length respectively, compression ratio ε=2.0, spiral shell rib width e=5mm, feeding section spiral groove depth h1=7mm, screw rod tooth pitch=1D, the gap of other melt canals all is 5.5mm.Machine barrel, screw rod, nozzle, mould all adopt the 38CrMoAla alloy material to make.
Under 230 ℃-250 ℃ temperature, the long glass fiber-reinforced polypropylene of moulding 30% glass fiber content (mass percentage content) (particle length is 12mm) test bars.
Same material is under 230 ℃-250 ℃ temperature, and (Hai Tian HTF58X1) makes the contrast batten to adopt common injection machine.Test the mechanical property of two kinds of battens again, the results are shown in Table 1:
The mechanical property of table 1.30% long glass fiber-reinforced polypropylene moulding batten
| Test item | Testing standard | Unit | Injection-moulding device moulding batten performance of the present invention | Common injection machine moulding batten performance |
| Hot strength | ??GB/T1040-2006 | ??MPa | ??125.5 | ??110.7 |
| Bending strength | ??GB/T9341-2000 | ??MPa | ??161.2 | ??140.3 |
| Bending modulus | ??GB/T9341-2000 | ??MPa | ??6715.9 | ??6063.3 |
| Test item | Testing standard | Unit | Injection-moulding device moulding batten performance of the present invention | Common injection machine moulding batten performance |
| Simple beam impact strength (breach) | ??ISO179-1∶2000 | ??KJ/m 2 | ??37.1 | ??21.4 |
| Simple beam impact strength (non-notch) | ??ISO179-1∶2000 | ??KJ/m 2 | ??52.5 | ??45.2 |
Through statistical analysis, the batten performance that injection-moulding device of the present invention makes obviously is better than the batten performance (p＜0.01) of common injection machine moulding.
Embodiment 2
The hopper bore diameter of injection-moulding device is 80mm, screw slenderness ratio L/D=20, feeding section L1, compression section L2, metering section L3 account for 40%, 40%, 20% of screw rod total length respectively, compression ratio ε=2.0, spiral shell rib width e=5mm, feeding section spiral groove depth h1=7mm, screw rod tooth pitch=1D, the gap of other melt canals all is 5.5mm.Machine barrel, screw rod, nozzle, mould all adopt the 38CrMoAla alloy material to make.
Adopt 230 ℃-250 ℃ temperature conditions, respectively the long glass fiber-reinforced polypropylene of moulding 40% (mass percentage content) glass fiber content (particle length is 12mm) batten on above-mentioned transformation injection machine and common injection machine.And the mechanical property of testing two kinds of battens, the results are shown in Table 2:
The mechanical property of table 2.40% long glass fiber-reinforced polypropylene moulding batten
| Test item | Testing standard | Unit | Injection-moulding device moulding batten performance of the present invention | Common injection machine moulding batten performance |
| Hot strength | ??GB/T1040-2006 | ??MPa | ??138.4 | ??118.7 |
| Bending strength | ??GB/T9341-2000 | ??MPa | ??178.7 | ??168.3 |
| Bending modulus | ??GB/T9341-2000 | ??MPa | ??7917.7 | ??7533.4 |
| Simple beam impact strength (breach) | ??ISO179-1∶2000 | ??KJ/m 2 | ??43.3 | ??26.4 |
| Test item | Testing standard | Unit | Injection-moulding device moulding batten performance of the present invention | Common injection machine moulding batten performance |
| Simple beam impact strength (non-notch) | ??ISO179-1∶2000 | ??KJ/m 2 | ??56.2 | ??47.2 |
Through statistical analysis, the batten performance that injection-moulding device of the present invention makes obviously is better than the batten performance (p＜0.01) of common injection machine moulding.
Embodiment 3
The screw slenderness ratio L/D=20 of injection-moulding device, feeding section L1, compression section L2, metering section L3 account for 40%, 40%, 20% of screw rod total length respectively, compression ratio ε is set to 2.25, spiral shell rib width e=5mm, feeding section spiral groove depth h1=7.5mm, screw rod tooth pitch=1D, the gap of other melt canals all is 6.5mm.Machine barrel, screw rod, nozzle, mould all adopt the 38CrMoAla alloy material to make.
Under 230 ℃-250 ℃ temperature, adopt above-mentioned transformation injection machine moulding long glass fiber-reinforced polypropylene (particle length is 12mm) batten; As a comparison case, use the batten of common injection machine injection moulding with shape.After two kinds of batten burnings fully, observe the length and the distribution of glass.
Both glass distribution of lengths such as Fig. 2 a, Fig. 2 b, from figure, can find injection-moulding device of the present invention to glass length remain with positive effect at last, this also is that goods obtain high performance basic reason.
Claims (10)
1. injection-moulding device that is used for forming long fiber reinforced plastics, comprise the hopper that has the screw rod of check ring and be used for supplying raw material in the machine barrel of being with nozzle, the machine barrel to machine barrel, it is characterized in that, described screw rod is made up of for three sections feeding section, compression section and metering section, and the distribution of lengths of each section in screw rod is:
Feeding section L1 40～55%;
Compression section L2 25～40%;
Metering section L3 15～25%.
2. injection-moulding device as claimed in claim 1 is characterized in that, described screw rod feeding section, compression section and the distribution of lengths of metering section in screw rod are:
Feeding section L1 40～45%;
Compression section L2 35～40%;
Metering section L3 20%.
3. injection-moulding device as claimed in claim 2 is characterized in that, described screw rod feeding section, compression section and the distribution of lengths of metering section in screw rod are:
Feeding section L1 40%;
Compression section L2 40%;
Metering section L3 20%.
4. injection-moulding device as claimed in claim 1 is characterized in that, the feed opening cross section that described hopper is communicated with machine barrel is circle or the length of side 80～100mm square of diameter 80～100mm.
5. as each described injection-moulding device of claim 1～4, it is characterized in that the component materials that directly contacts with the long fiber reinforced plastics melt in the described injection-moulding device is 38CrMoAla, Cr12MoV or 4Cr5MoSiV1.
6. injection-moulding device as claimed in claim 1 is characterized in that, described feeding section spiral groove depth h1 is 5～9mm; The spiral groove depth h3 of metering section is 2～5mm.
7. injection-moulding device as claimed in claim 1 is characterized in that, described screw rod tooth pitch (pitch) s is 1D-1.5D, and D is a Major Diam.
8. injection-moulding device as claimed in claim 7 is characterized in that, described screw slenderness ratio L/D=(16～22): 1.
9. injection-moulding device as claimed in claim 8 is characterized in that, described screw compression is than being (1.8～2.5): 1.
10. injection-moulding device as claimed in claim 9 is characterized in that, described screw compression is than being (2.0～2.5): 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2009101550544A CN101708645B (en) | 2009-12-14 | 2009-12-14 | Injection molding machine for forming long fiber reinforced plastics |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101550544A CN101708645B (en) | 2009-12-14 | 2009-12-14 | Injection molding machine for forming long fiber reinforced plastics |
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| CN101708645A true CN101708645A (en) | 2010-05-19 |
| CN101708645B CN101708645B (en) | 2012-11-21 |
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| CN2009101550544A Expired - Fee Related CN101708645B (en) | 2009-12-14 | 2009-12-14 | Injection molding machine for forming long fiber reinforced plastics |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102975342A (en) * | 2012-11-08 | 2013-03-20 | 柳州市欧科塑胶机械成套设备有限公司 | Plastic injection molding machine |
| CN103600078A (en) * | 2013-09-12 | 2014-02-26 | 苏州米莫金属科技有限公司 | Screw injection molding device |
| CN106564174A (en) * | 2016-09-30 | 2017-04-19 | 营口康辉石化有限公司 | Extruder screw |
| CN108081561A (en) * | 2018-01-12 | 2018-05-29 | 广东泰安模塑科技股份有限公司 | A kind of injection structure of natural-fiber composite material |
| CN111497168A (en) * | 2019-01-30 | 2020-08-07 | 南亚塑胶工业股份有限公司 | Extruder and L FT extrusion piece made by using same |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5041258A (en) * | 1989-04-28 | 1991-08-20 | Polyplastics Co., Ltd. | Injection process for long fiber-containing resin |
| US5773042A (en) * | 1994-10-14 | 1998-06-30 | Kabushiki Kaisha Kobe Seiko Sho | Injection molding unit for long fiber-reinforced thermoplastic resin |
| JP2000254949A (en) * | 1999-03-05 | 2000-09-19 | Meiki Co Ltd | Injection device |
| US20070007685A1 (en) * | 2005-07-05 | 2007-01-11 | Gleich Klaus F | Methods and systems for making long fiber reinforced products and resultant products |
| CN201597148U (en) * | 2009-12-14 | 2010-10-06 | 浙江俊尔新材料有限公司 | Injection molding equipment used for molding long fiber reinforced plastics |
-
2009
- 2009-12-14 CN CN2009101550544A patent/CN101708645B/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102975342A (en) * | 2012-11-08 | 2013-03-20 | 柳州市欧科塑胶机械成套设备有限公司 | Plastic injection molding machine |
| CN103600078A (en) * | 2013-09-12 | 2014-02-26 | 苏州米莫金属科技有限公司 | Screw injection molding device |
| CN106564174A (en) * | 2016-09-30 | 2017-04-19 | 营口康辉石化有限公司 | Extruder screw |
| CN106564174B (en) * | 2016-09-30 | 2019-06-28 | 营口康辉石化有限公司 | A kind of extruder screw |
| CN108081561A (en) * | 2018-01-12 | 2018-05-29 | 广东泰安模塑科技股份有限公司 | A kind of injection structure of natural-fiber composite material |
| CN111497168A (en) * | 2019-01-30 | 2020-08-07 | 南亚塑胶工业股份有限公司 | Extruder and L FT extrusion piece made by using same |
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| CN101708645B (en) | 2012-11-21 |
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Address after: 325011 Wenzhou economic and Technological Development Zone, Zhejiang high tech Park Road, No. 60 Patentee after: CGN JUNER NEW MATERIALS Co.,Ltd. Patentee after: SHANGHAI JUNER NEW MATERIALS Co.,Ltd. Address before: 325011 Wenzhou economic and Technological Development Zone, Zhejiang high tech Park Road, No. 60 Patentee before: Zhejiang Juner New Materials Co.,Ltd. Patentee before: SHANGHAI JUNER NEW MATERIALS Co.,Ltd. Address after: 325011 Wenzhou economic and Technological Development Zone, Zhejiang high tech Park Road, No. 60 Patentee after: Zhejiang Juner New Materials Co.,Ltd. Patentee after: SHANGHAI JUNER NEW MATERIALS Co.,Ltd. Address before: 325011 Wenzhou economic and Technological Development Zone, Zhejiang high tech Park Road, No. 60 Patentee before: Zhejiang Juner New Material Co.,Ltd. Patentee before: SHANGHAI JUNER NEW MATERIALS Co.,Ltd. |
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