CN109454805A - The injection molding forming method of glass fibre orientation in a kind of oriented control plastic - Google Patents
The injection molding forming method of glass fibre orientation in a kind of oriented control plastic Download PDFInfo
- Publication number
- CN109454805A CN109454805A CN201811216567.7A CN201811216567A CN109454805A CN 109454805 A CN109454805 A CN 109454805A CN 201811216567 A CN201811216567 A CN 201811216567A CN 109454805 A CN109454805 A CN 109454805A
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- Prior art keywords
- glass fibre
- injection
- plastic
- fiber
- forming method
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- 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.)
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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
- B29C45/0005—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor using fibre reinforcements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
- B29K2105/12—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of short lengths, e.g. chopped filaments, staple fibres or bristles
- B29K2105/14—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of short lengths, e.g. chopped filaments, staple fibres or bristles oriented
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
- B29K2105/16—Fillers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/25—Solid
- B29K2105/251—Particles, powder or granules
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
The invention discloses the injection molding forming method that glass fibre in a kind of oriented control plastic is orientated, solves the problems, such as that existing injection molding forming method is complicated, is difficult to effectively control glass fibre orientation.Resin-base glass fibre material, reduced iron powder and adhesive are uniformly mixed with injection raw material including (1) by technical solution；(2) using the fiber orientation set as foundation, the alnico magnets of the pole N and the pole S are respectively set in the type chamber two sides corresponding position in injection mold；It (3) will be in the type chamber of injection raw material injection injection mold, fiber orientation state of the fiber in setting under magnetic fields in injection raw material, it synchronizes and the injection raw material in type chamber be heating and curing forming plastic, finally demoulding obtains the plastic that there is directional glass fiber to be orientated.The method of the present invention is extremely simple, can be effectively controlled plastic surface layer and core glass fibre orientation, does not change the main structure of existing injection mold and interior layout, do not change fiber content and molding proces s parameters.
Description
Technical field
The present invention relates to a kind of injection molding forming method of plastic, glass fibre in specifically a kind of oriented control plastic
The injection molding forming method of orientation.
Background technique
In the composite, fiber is the key that determine composite material tensile strength, modulus, elongation percentage as reinforcing material
Component, basis material mainly play a part of transmitting load.In the short fiber composite material plastic of random orientation, fiber it is strong
It spends efficiency and is significantly lower than strength efficiency of the individual event continuous fiber in basis material, therefore, the low cost of short fiber composite material
It is to reduce the structure efficiency of plastic as cost with high production rate.In addition, the performance of short fiber composite material is unstable, this is
The reason of fiber random alignment in the base.During compression molding, geometry, weld seam and the resin of mould type core pattern chamber
Ripple all can make fiber orientation disorderly and unsystematic.These defects of short fiber composite material make its loss of strength be up to 30%~
50%.If tropism control can be implemented to the staple fiber of random orientation, so that it may sufficiently improve designing for this composite material
Property, the stable anisotropy short fiber composite material plastic part of performance is produced, the mesh for not only improving efficiency but also reducing cost is reached
's.
In injection moulding process, fiber can be orientated with the flow direction of resin, therefore, as can trying to control resin stream
Direction controls fiber orientation, can also form a degree of individual event short fiber composite material.
Viscosity of the flow direction of resin by compound in mold, the finish and its geometry of injection moulding speed and type chamber
Etc. factors influence, fiber can only be influenced by resin stream and be orientated in region near wall of die cavity, in flow field center,
Fiber is still randomly oriented, and therefore, the surface fibre of gained plastic is directional orientation, and the fiber of plastic core is still random row
Column.
The method difficulty of this control fiber orientation is too big, is only applicable to simple rectangle building, and also need to examine meticulously
Consider the channel of injection compound and the geometric dimension in flow field.A large number of experiments is carried out in spite of artificial this, but there is no much realities
With value.
And fiber orientation is relatively to be difficult to control and solve the problems, such as always so far, under certain condition, passes through drop
Low fibre content, or change mold cavity structure etc. can improve fiber orientation problem, but all cannot be preferable, control consciously
Fiber orientation processed, fiber distribution, it is therefore desirable to be improved.
Summary of the invention
The purpose of the present invention is to solve above-mentioned technical problem, provide that a kind of method is extremely simple, can be effectively controlled modeling
Part surface layer and core glass fibre orientation do not change the main structure of existing injection mold and interior layout, do not change fiber content
And in molding proces s parameters, easily operated oriented control plastic glass fibre orientation injection molding forming method.
The technical scheme comprises the following steps:
(1) resin-base glass fibre material, reduced iron powder and adhesive are uniformly mixed with injection raw material；
(2) using the fiber orientation set as foundation, the type chamber two sides corresponding position in injection mold be respectively set the pole N and
The alnico magnets of the pole S；
(3) injection raw material is injected in the type chamber of injection mold, the fiber in injection raw material is under magnetic fields to be set
Fixed fiber orientation state synchronizes and be heating and curing forming plastic to the injection raw material in type chamber, and finally demoulding is had
The plastic of directional glass fiber orientation.
In the step (1), the additive amount of reduced iron powder is the 5- of glass fiber quality in resin-base glass fibre material
15%%.
In the step (1), the glass fibre in resin-base glass fibre material is staple fiber, the fiber of the staple fiber
Diameter is 9-13um, chopped length 4.5-6mm.
In the step (2), distance L of the alnico magnets apart from plastic is 0 < L≤30mm.
In the step (2), the alnico magnets of the pole N and the pole S are arranged in injection mold by magnet slot.
The alnico magnets are ndfeb magnet.
The problem of for background technique, inventor are based under magnetic fields, the principle of the orientable flowing of iron powder, will
Iron powder uniformly mixes in injection raw material, then places it under magnetic fields, iron powder while injection molding, in injection raw material
Glass fibre directed flow can be guided, further, by controlling the position and direction of magnetic field positive and negative anodes in advance, control can be oriented
The orientation of glass fibre in plastic processed.This solves the directions of past control resin stream to control existing for fiber orientation
The fiber of plastic core still random alignment the problem of, the glass fibre " thinking and acting in one and the same way " in plastic can be made in setting taking
To state, to effectively improve the critical functions index such as the tensile strength of plastic, modulus, elongation percentage, or even can flexibly manufacture
With the specific plastic for increasing function, the plastic for strengthening a certain end face function is such as required.
The resin-base glass fibre material be it is commercially available, main component be resin and glass fibre, the glass fibre
Content can be depending on the specific requirements of plastic, and the application not and changes in original technology to resin-base glass fibre material and viscous
The conventional selection of mixture.In order to guarantee that former iron powder determines guide effect to glass fibre under magnetic field, the additive amount of reduced iron powder is excellent
It is selected as the 5-15%% of glass fiber quality in resin-base glass fibre material, can excessively change resin and glass fibre material significantly
Expect original attribute, and influences plastic flow property in injection moulding process, it is excessively few then to play magnetic guiding role very well.It is described short
The fibre diameter of fiber is preferably 9-13um, and chopped length is preferably 4.5-6mm, and fibre length is too long to will affect fiber flow
Property, poor mobile performance；Fibre length is too short, then fiber position in injection moulding process is difficult to control, and not can guarantee in injection moulding process
It is along Radial Flow or longitudinal flow.
It is simple and easy to get to create alnico magnets required for magnetic field state, it is low in cost, it is easy to be transformed, the pole N and the pole S are forever
Long property magnet is divided into the two sides of plastic position in injection mold, in combination with the needs and mold specific structure of default fiber orientation
It is embedded in the components around mold cavity, not change the main structure of existing injection mold and interior layout, not influence to be molded
The movement of each component of mold is positioned as close to plastic preferably, and distance L of the preferably described alnico magnets apart from plastic is 0 < L
≤30mm.The selection of alnico magnets size dimension, which should ensure that, allows entire plastic can be among magnetic field, and does not influence to be installed
The movement and function of component, it may be necessary to be respectively arranged the alnico magnets of the muti-piece corresponding pole N and the pole S in plastic two sides.
The utility model has the advantages that
Present invention process is extremely simple, easily operated, and production cost is low, does not change original raw materials technology, does not change technique
Process, condition and mould structure can be directed to injection raw material middle short fiber orientation in control injection moulding process, enhance plastic various aspects
Energy；Alnico magnets can flexibly be assembled according to preset fiber orientation and be set, and changed magnetic field application direction and reached fixed point, determine face, fixed
The purpose that region is strengthened, can manufacture the plastic of a variety of different function, different demands even particular demands.
Detailed description of the invention
Fig. 1 is alnico magnets arrangement schematic diagram in scheme one；
Fig. 2 is alnico magnets arrangement schematic diagram in scheme two；
Fig. 3 is alnico magnets arrangement schematic diagram in scheme three.
Wherein, 1- plastic, 2- alnico magnets, 3- staple fiber.
Specific embodiment
Following resin-base glass fibre material purchases are from Chang Hong photoelectricity company, content of glass fiber 20wt%；Reduced iron
Powder purchases 10~44 μm of granularity of fine powder, and additive amount is the 5-15% of the glass fiber quality；Described adhesive is thermoplasticity
The heat-fusible adhesive of resin composition, additive amount are the 10-20% of resin-base glass fibre quality of materials.
Process example:
(1) resin-base glass fibre material, reduced iron powder and adhesive are uniformly mixed with injection raw material.Wherein, it sets
Glass fibre in aliphatic radical glass fiber material is staple fiber, and the fibre diameter of the staple fiber is 9-13um, and chopped length is
4.5-6mm。
(2) using the fiber orientation set as foundation, the type chamber two sides corresponding position in injection mold be respectively set the pole N and
The alnico magnets of the pole S, the alnico magnets are arranged in injection mold by magnet slot, permanent described in two sides to guarantee
Distance L of the magnet apart from plastic is 0 < L≤30mm；The alnico magnets are ndfeb magnet.
(3) injection raw material is injected in the type chamber of injection mold, the fiber in injection raw material is under magnetic fields to be set
Fixed fiber orientation state synchronizes and be heating and curing forming plastic to the injection raw material in type chamber, and finally demoulding is had
The plastic of directional glass fiber orientation.
As the scheme one that the present invention enumerates, by taking the plastic of production is standard tensile part as an example, therefore setting plastic need to
What is enhanced is tensioning member tensile strength, it is desirable that the orientation of staple fiber 3 is arranged in draw direction individual event, therefore alnico magnets 2 are filled
1 both ends of plastic are fitted over to provide stabilizing magnetic field, the arrangement of the alnico magnets 2 can be according to the practical structures of different injection molds
Rationally it is arranged, such as shown in Fig. 1, it is corresponding that the alnico magnets 1 of the pole S are mounted on (plastic 1 of two chamber of a mould) right end of plastic 1
Solid plate upper surface, the pole N alnico magnets 2 correspondence is mounted on the corresponding solid plate lower end surface in 1 left end of plastic, magnetic field make
It is arranged with lower staple fiber 3 in draw direction individual event.
As the scheme two that the present invention enumerates, by taking the plastic of production is die casting as an example, it is desirable that fiber is in longitudinal individual event
Arrangement, therefore alnico magnets are assembled in 1 upper and lower end face of plastic to provide stabilizing magnetic field, such as shown in Fig. 2, described, the pole N is forever
Long 2 correspondence of property magnet is mounted on the corresponding fixed mold plate in 1 upper end of plastic, and the correspondence of alnico magnets 2 of the pole S is mounted on plastic
In the corresponding dynamic model cavity plate in 1 lower end, magnetic direction is identical as injection raw material flow direction, and staple fiber 3 is under magnetic fields
Longitudinal individual event arrangement.
As the scheme three that the present invention enumerates, by taking the plastic of production requires to strengthen a certain end face as an example, as shown in figure 3,
Therefore exchange the position of the alnico magnets 2 of the pole N in scheme two and the alnico magnets 2 of the pole S, so that magnetic direction and injection molding are former
Direction of flow is on the contrary, staple fiber 3 is relatively concentrated in one end in plastic 1 close to the pole S alnico magnets 2 under magnetic fields.
Claims (6)
1. the injection molding forming method that glass fibre is orientated in a kind of oriented control plastic, it is characterised in that, the following steps are included:
(1) resin-base glass fibre material, reduced iron powder and adhesive are uniformly mixed with injection raw material；
(2) using the fiber orientation set as foundation, the pole N and the pole S is respectively set in the type chamber two sides corresponding position in injection mold
Alnico magnets；
(3) by the type chamber of injection raw material injection injection mold, the fiber in injection raw material is under magnetic fields in setting
Fiber orientation state synchronizes and be heating and curing forming plastic to the injection raw material in type chamber, and finally demoulding obtains having orientation
The plastic of glass fibre orientation.
2. the injection molding forming method that glass fibre is orientated in oriented control plastic as described in claim 1, it is characterised in that, institute
It states in step (1), the additive amount of reduced iron powder is the 5-15%% of glass fiber quality in resin-base glass fibre material.
3. the injection molding forming method that glass fibre is orientated in oriented control plastic as claimed in claim 1 or 2, feature exist
In in the step (1), the glass fibre in resin-base glass fibre material is staple fiber, the fibre diameter of the staple fiber
For 9-13um, chopped length 4.5-6mm.
4. the injection molding forming method that glass fibre is orientated in oriented control plastic as described in claim 1, it is characterised in that, institute
It states in step (2), distance L of the alnico magnets apart from plastic is 0 < L≤30mm.
5. the injection molding forming method that glass fibre is orientated in oriented control plastic as described in claim 1 or 4, feature exist
In in the step (2), the alnico magnets of the pole N and the pole S are arranged in injection mold by magnet slot.
6. the injection molding forming method that glass fibre is orientated in oriented control plastic as described in claim 1 or 4, feature exist
In the alnico magnets are ndfeb magnet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811216567.7A CN109454805A (en) | 2018-10-18 | 2018-10-18 | The injection molding forming method of glass fibre orientation in a kind of oriented control plastic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811216567.7A CN109454805A (en) | 2018-10-18 | 2018-10-18 | The injection molding forming method of glass fibre orientation in a kind of oriented control plastic |
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|---|---|
| CN109454805A true CN109454805A (en) | 2019-03-12 |
Family
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| CN201811216567.7A Pending CN109454805A (en) | 2018-10-18 | 2018-10-18 | The injection molding forming method of glass fibre orientation in a kind of oriented control plastic |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111089212A (en) * | 2019-12-31 | 2020-05-01 | 浙江大学 | Short fiber reinforced plastic electric melting pipe fitting with optimized injection position and injection mold thereof |
| CN111497103A (en) * | 2020-04-14 | 2020-08-07 | 苏州博琪海电器有限公司 | Injection molding process of micro-adjustment type dust collector shell |
| CN111546676A (en) * | 2020-05-27 | 2020-08-18 | 台州巨壹塑业有限公司 | Production process of fiber-reinforced PVC (polyvinyl chloride) hose |
| CN113211904A (en) * | 2021-04-29 | 2021-08-06 | 西安建筑科技大学 | Corrugated reinforced metal/fiber mixed structure plate and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111089212A (en) * | 2019-12-31 | 2020-05-01 | 浙江大学 | Short fiber reinforced plastic electric melting pipe fitting with optimized injection position and injection mold thereof |
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| CN111497103A (en) * | 2020-04-14 | 2020-08-07 | 苏州博琪海电器有限公司 | Injection molding process of micro-adjustment type dust collector shell |
| CN111497103B (en) * | 2020-04-14 | 2021-12-03 | 苏州博琪海电器有限公司 | Injection molding process of micro-adjustment type dust collector shell |
| CN111546676A (en) * | 2020-05-27 | 2020-08-18 | 台州巨壹塑业有限公司 | Production process of fiber-reinforced PVC (polyvinyl chloride) hose |
| CN113211904A (en) * | 2021-04-29 | 2021-08-06 | 西安建筑科技大学 | Corrugated reinforced metal/fiber mixed structure plate and preparation method thereof |
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Application publication date: 20190312 |