EP2836348A1 - Presse a micro injection. - Google Patents
Presse a micro injection.Info
- Publication number
- EP2836348A1 EP2836348A1 EP13720472.3A EP13720472A EP2836348A1 EP 2836348 A1 EP2836348 A1 EP 2836348A1 EP 13720472 A EP13720472 A EP 13720472A EP 2836348 A1 EP2836348 A1 EP 2836348A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- injection
- piston
- zone
- compression
- molding machine
- 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.)
- Withdrawn
Links
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
- B29C45/53—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston
- B29C45/535—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston using two or more cooperating injection rams, e.g. coaxially or alternately operating rams
-
- 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
- B29C2045/0094—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor injection moulding of small-sized articles, e.g. microarticles, ultra thin articles
-
- 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
- B29C45/53—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston
- B29C2045/536—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston rotatable injection plungers
-
- 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
- B29C45/53—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston
- B29C2045/537—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston the injection plunger cooperating with a coaxial hollow transfer plunger
Definitions
- the invention relates to the field of injection molding, in particular thermoplastics. It relates to an injection press for injecting a plastic material into a mold for making an object.
- Injection molding involves two essential elements, an injection press and a mold.
- the mold reproduces the shape of the part to be manufactured.
- the injection molding machine injects into the mold, under pressure, a material made fluid or pasty by temperature rise, so that it occupies the space formed in the mold and takes the form of the object while cooling. It is a technique suitable for the manufacture of parts in large or very large series, especially plastics.
- the raw thermoplastics are in the form of granules whose size is close to one millimeter.
- One known way to soften these granules and inject them into a mold is to use an injection press with a worm rotating in a heated cylinder. The combined action of heat and friction softens the material, and the material is driven by the screw to the mold.
- This type of injection press has several disadvantages:
- thermoplastic material in the press is relatively large, which is likely to cause degradation of the most fragile materials; this is aggravated by the high temperature, close to 250 ° C, at which the material is subjected in this type of press; -
- the lost volume of material is important, while the cost of some materials is very high, especially since it is not possible to significantly reduce the diameter of the screw .
- a second annular piston called compression coaxial with the injection piston and slidably mounted on its upper part, is intended to compress the raw material in the hopper and in the compression chamber to make it penetrate into the shear zone and plasticization , then in the injection jar once fluidized.
- This type of press operates at a lower temperature of about 20 ° C than the screw press already mentioned, however it is difficult to precisely adjust the injection volume, which is a problem for making small parts.
- the invention proposes to solve these problems.
- an injection molding machine for injecting a fluid material into a mold of the type comprising:
- a compression zone of the material to be injected comprising compression means
- a fluidification zone of the material to be injected in communication with said compression zone and comprising fluidization means
- the injection zone may comprise two distinct chambers in communication with each other, each having their injection means.
- the injection zone may comprise an injection jar and a lateral injection channel in communication with the injection jar near an injection point, a cross section of the lateral injection channel being more weaker than an inner cross section of the injection pot.
- the injection means may comprise a first injection piston, slidably mounted inside the injection pot, and a second injection piston, slidably mounted inside the lateral injection channel.
- the fluidification means may comprise the first injection piston pivoted on itself within said fluidization zone, and the compression means may comprise an annular compression piston coaxial with the first injection piston and mounted sliding around the first injection piston.
- the injection press according to the invention therefore comprises three pistons:
- a first injection piston which fulfills two functions: firstly, by turning on itself in a fluidification zone, it contributes to causing the fluidification of the material, on the other hand, by sliding in the injection jar, it exerts a pressure on the material to make it penetrate into the lateral injection channel,
- a second injection piston which, by sliding in the lateral injection channel, initially sucks the material into the lateral channel, in a second time exerts pressure on the material to push it towards the injection point; and in the mold.
- the compression piston and the first injection piston are coaxial: the compression piston is annular and slides along the first injection piston in the compression zone.
- the injection point comprises an injection valve.
- the first injection piston sliding in the injection pot, causes the filling of the lateral channel
- the second injection piston sliding in the side channel, causes the injection of material into the mold connected to the injection nozzle.
- the valve in the first sequence, the valve is closed so that the material is directed towards the lateral channel
- valve in the second sequence, the valve is open so that the material is directed towards the mold, the first injection piston remaining fixed in the injection pot.
- the invention also relates to an injection method using an injection press according to the invention, comprising the steps of:
- the fluid material is simultaneously sucked by means of said second injection piston.
- the injection can be repeated as long as there is material in the side channel.
- FIGS. 1 to 4 show schematically in section the injection press in different positions in the injection cycle.
- the injection press illustrated in FIGS. 1 to 4 comprises a main body A which comprises three coaxial zones in the extension of one another:
- a compression zone 10 at the top which receives the raw material in the form of solid granules introduced through a lateral opening 11 made in the wall of the zone, in which the material is compressed; this zone feeds the press in material;
- a fluidization zone 20 of conical shape in which fluidization or plasticization of the material takes place by shearing and friction (Couette effect) as well as by heating,
- an injection zone comprising an injection pot 30 of cylindrical inner section, in the extension of the fluidification zone; this injection jar is closed by a bottom 31 having an injection point 32 in the form of an injection nozzle provided with a valve 33, intended to be connected to a mold (not shown).
- Raw material is therefore present at least in the feed and compression zone 10, the fluidification zone 20 and the injection pot 30.
- a secondary body B is connected to the injection zone of the press near the injection point 32.
- This secondary body comprises a lateral injection channel 40 which communicates with the injection pot 30 in its lower part, close to bottom 31 and therefore near the valve 33; the internal diameter of this lateral injection channel is smaller than that of the injection pot.
- the diameter of the lateral injection channel will be about 4 mm while that of the injection pot will be about 10 mm.
- This device is completed by three pistons:
- a first cylindrical injection piston 50 which passes through the feed and compression zone 10 and plunges into the zone of fluidification 20 and in the injection pot 30; this first piston 50 can be driven by two movements: an axial rotational movement (arrow F2) which causes, by shearing and friction, the fluidification or plasticization of the material, and a sliding movement (arrow F1) which causes the injection of the fluidized material; in the described embodiment, the rotational and sliding movements are disjoint, although they may be joined in another embodiment;
- An annular compression piston 60 coaxial with the first injection piston 50, slidably mounted (arrow F3) between the inner wall of the supply and compression zone 10 and the first injection piston 50 on its upper part; this compression piston 60 exerts a pressure on the solid material at the level of the feed and compression zone 10 to make it penetrate into the fluidification zone 20 and increase the friction on the first injection piston 50;
- a second injection piston 70 slidably mounted (arrow F4) inside the lateral channel 40; of course, the diameter of this second injection piston is smaller than the diameter of the first injection piston 50.
- the tolerance between the diameter of the orifice 21 of the fluidization zone 20 and the injection pot 30 on the one hand, and that of the first piston 50 on the other hand is an important characteristic of the press, given that the first piston must be able to slide, even on a short length, into the injection pot.
- the tolerance between the diameters is about 1 micron.
- Figure 1 shows the injection press in a position where it can be fed raw material through the side opening 11, the compression piston 60 being raised.
- Figure 2 shows the injection press in a position where the raw material is compressed by the compression piston 60.
- the first injection piston 50 rotates to fluidify the material; he was relieved to prepare the injection; the valve 33 is closed.
- FIG. 3 shows the injection press in a position where the first injection piston 50 injects material into the injection channel lateral 40; advantageously, the second injection piston 70 simultaneously sucks the material; the valve 33 is closed.
- FIG. 4 shows the injection press in a position where the second injection piston 70 injects the material into the mold, the valve 33 being open.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1253380A FR2989301B1 (fr) | 2012-04-12 | 2012-04-12 | Presse a micro injection. |
PCT/FR2013/050783 WO2013153333A1 (fr) | 2012-04-12 | 2013-04-11 | Presse a micro injection. |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2836348A1 true EP2836348A1 (fr) | 2015-02-18 |
Family
ID=48289460
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP13720472.3A Withdrawn EP2836348A1 (fr) | 2012-04-12 | 2013-04-11 | Presse a micro injection. |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2836348A1 (fr) |
FR (1) | FR2989301B1 (fr) |
WO (1) | WO2013153333A1 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA2827195C (fr) * | 2011-03-12 | 2016-10-25 | Husky Injection Molding Systems Ltd | Dispositif de plastification et d'injection |
JP7375730B2 (ja) | 2020-11-16 | 2023-11-08 | トヨタ自動車株式会社 | 射出成形機、射出成形装置及び射出成形方法 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB501277A (en) * | 1937-08-21 | 1939-02-21 | Henry Grafton | Improvements in and relating to the moulding of thermoplastic materials by injection |
US3844699A (en) * | 1971-12-03 | 1974-10-29 | B Maxwell | Injection molding machine with a rotary plunger and rod mixing and working chamber |
FR2246377A1 (en) | 1973-10-08 | 1975-05-02 | Prus Henryk | Injection unit for plastics moulding machine - offering independent control of melt shear and transfer functions |
FR2680338B1 (fr) * | 1991-08-16 | 1993-10-01 | Henryk Prus | Dispositif de plastification par cisaillement, destine aux unites d'injection pour les machines a mouler les matieres plastiques. |
-
2012
- 2012-04-12 FR FR1253380A patent/FR2989301B1/fr active Active
-
2013
- 2013-04-11 WO PCT/FR2013/050783 patent/WO2013153333A1/fr active Application Filing
- 2013-04-11 EP EP13720472.3A patent/EP2836348A1/fr not_active Withdrawn
Non-Patent Citations (2)
Title |
---|
None * |
See also references of WO2013153333A1 * |
Also Published As
Publication number | Publication date |
---|---|
FR2989301A1 (fr) | 2013-10-18 |
WO2013153333A1 (fr) | 2013-10-17 |
FR2989301B1 (fr) | 2014-12-19 |
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