GB2161107A - Method and apparatus for cold runner transfer molding - Google Patents
Method and apparatus for cold runner transfer molding Download PDFInfo
- Publication number
- GB2161107A GB2161107A GB08508320A GB8508320A GB2161107A GB 2161107 A GB2161107 A GB 2161107A GB 08508320 A GB08508320 A GB 08508320A GB 8508320 A GB8508320 A GB 8508320A GB 2161107 A GB2161107 A GB 2161107A
- Authority
- GB
- United Kingdom
- Prior art keywords
- block
- runner
- cavities
- mold
- mold apparatus
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000001721 transfer moulding Methods 0.000 title claims description 13
- 238000000034 method Methods 0.000 title claims description 11
- 238000010137 moulding (plastic) Methods 0.000 claims abstract description 22
- 239000012778 molding material Substances 0.000 claims abstract description 14
- 238000001816 cooling Methods 0.000 claims abstract description 7
- 239000004033 plastic Substances 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims 1
- 150000001875 compounds Chemical class 0.000 abstract description 21
- 238000000465 moulding Methods 0.000 abstract description 14
- 239000007788 liquid Substances 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 108091092889 HOTTIP Proteins 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000010924 continuous production Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000002991 molded plastic Substances 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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
- B29C45/02—Transfer moulding, i.e. transferring the required volume of moulding material by a plunger from a "shot" cavity into a mould cavity
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/2756—Cold runner channels
-
- 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
- B29C45/57—Exerting after-pressure on the moulding material
- B29C45/572—Exerting after-pressure on the moulding material using movable mould wall or runner parts
-
- 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
- B29C45/72—Heating or cooling
- B29C45/73—Heating or cooling of the mould
-
- 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
- B29K2101/00—Use of unspecified macromolecular compounds as moulding material
- B29K2101/10—Thermosetting resins
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Insulating (14) and optionally cooling means (16) are provided so that the mold runnerblock (10, 12) is kept sufficiently cool to prevent curing of the plastic molding compound therein. By the addition of a plunger (16A) near the gate of the mold, a quasi-continuous molding operation may be effected. Local preheating by element (18) of the molding material at the gate locale may be used to liquefy a feedstock which has travelled through the cold-runners in powdered form. <IMAGE>
Description
SPECIFICATION
Method and apparatus for cold runner transfer molding
Background of the Invention 1. Field of the Invention
This invention relates generally to the transfer molding of multiple plastic objects, and, more particularly, to the transfer molding of multiple plastic-encapsulated semiconductor devices.
2. Description of the Prior Art
In the transfer molding of a multiplicity of plastic devices in a multi-cavity metallic mold, the prior art practice was to provide a multicavity metallic mold comprising separable top and bottom mold portions including a plurality of cavities for the objects to be molded as well as a plurality of runners comprising a distribution system for feeding the molding compound to each of the individual cavities. The runners typically terminate in a common cull or gate area used to source the plastic molding compound to the plurality of cavities. The top and bottom mold halves are held together in a press, and the assembly is heated so that the molding material will cure.The plastic molding material, which is usually in powder form, is pressed or pelletized so that it may be pretreated in a portion of the mold assembly to put it in a liquid or semi-liquid form. A plunger is used to force the heated molding compound under very light pressure into the runner system of the mold for distribution to each of the plurality of object cavities in the multi-cavity mold.
Among the disadvantages of the type of transfer molding system described above are included the fact that molding compound must be pelletized to a size commensurate with the volume of the cavities and runners in the mold to be used. The resulting often rather large plug of plastic molding compound then may require a substantial time for preheating. Since the runners are in the mold halves along with the object cavities, the heated mold halves also set up or cure the plastic mold compound in the cavities as well as the object cavities. This may result in a substantial waste of plastic depending on the relative volumes in the runners and the object cavities Also, because the system does not admit of continuous molding compound feeding, production throughput is limited by the batch nature of the operation.Therefore a need has existed to provide a method and mold members which permit continuous molding compound feeding, preferably from a powder form, for the transfer molding of multiple small objects in a heated multi-cavity mold.
Summary of the Invention
In accordance with one embodiment of this invention, it is a object of this invention to provide an improved method and apparatus for the transfer molding of small objects.
It is another object of this invention to provide an improved mold apparatus and method for the insert molding of semiconductor electronic devices and integrated circuits.
It is a further object of this invention to provide an improved method and mold apparatus to permit the substantially continuous feeding of plastic mold compound into a multi-cavity mold.
It is still another object of this invention to provide an improved method and mold apparatus to obviate the necessity of pelletizing the plastic molding compound.
In accordance with a preferred embodiment of the present invention, the runner portions of a multi-cavity mold are thermally insulated from the metallic mold cavities to permit feeding of a stream of molding compound directly to the gate portions of the mold, without curing the plastic in the runner portion of the mold.
According to another embodiment of this invention, cooling is provided for the runner portion of a molding system to prevent curing of the plastic molding compound in the runner system.
According to yet another embodiment of this invention, plastic molding compound is distributed via runners sufficiently cold to prevent curing of the material until it reaches the cull/gate portion of the molding system, where a plunger and local heating are provided to feed liquid molding compound under pressure to the mold cavities.
The foregoing and other objects, features, and advantages of this invention will be aparent from the following, more particular, description of the preferred embodiments of the invention, as illustrated in the accompany drawing.
Brief Description of the Figures
Figure 1 is a cross-sectional view of the object cavities and cold-runner system of a stationary mold apparatus according to the present invention.
Figure 2 is a cross-sectional view of a coldrunner mold apparatus including a plunger for use in a system where mold portions are transferred in and out of a mold station in a semi-continuous process.
The Specification
Referring now to Fig. 1, there is illustrated a top half 4 (and the bottom half 2) of a mold suitable for the formation of insert-molded semiconductor electronic pakages comprising lead frames 8 partially surrounded by plastic bodies 6. The mold separates along the partline between upper mold portion 4 and low mold portion 2 to permit extraction of the finished molded plastic objects. Both mold halves are formed from a thermally conductive metallic material, such as stainless steel. Over top mold portion 4 are additional metallic members 10 and 12 forming a portion of a runner 20 for supplying the plastic molding compound to the lead frame cavities of the mold. The vertical portion of the runner 20 is formed by a block 15 having a tapered orifice. The runner blocks 10 and 12 contain numerous runners 20 to feed a plurality of cavities in the cavity block.Each of the plurality of runners 20 is supplied from a central reservoir of plastic molding material.
Each runner 20 is insulated from the top and bottom mold portions 4 and 2 by thermally insulating material 14 to maintain the temperature of the runner at no more than about 80 C while the top and bottom mold portions are heated to about 1 70 C. An insert heating element 18 provides a hot tip for maintaining the temperature in the cull/gate area at about 1 85 C to facilitate the heating of the plastic mold compound in the portions of the stream just prior to the entry to the object cavities holding the insert lead frames 8. Passages 16 allow for the passage of coolant to keep the orifice block 15 at a sufficiently low temperature to prevent liquefication and/or curing of the stream of molding compound in the runner 20.The partline between the runner block portions 10 and 12 allows them to be separated to clean out the runner if required. Either pressure or vacuum may be applied at the extremities (not shown) of the horizontal portion of the channel 20 so that the plastic molding compound may be supplied to the mold cavities at the onset of the molding cycle and the excess withdrawn after the cavities have been filled with liquefied material.
Referring now to Fig. 2, there is illustrated in cross-section a portion of a mold apparatus similar to that shown by Fig. 1. Top and bottom mold halves 4 and 2 have multiple cavities for the formation of bodies 6 about metallic insets 8. Runner block portions 10 and 12 of the mold apparatus contain a runner 20 for the provision of a stream of plastic molding compound to the mold cavities. The mold appratus in Fig. 2 differs from that in Fig. 1 in that the runner block portion 10 is maintained at a cooler temperature than top mold 4 by the provision of both insulating material 14 and passages 1.6 for the flow of coolant. In this way the runner block may be maintained at about 80 C while the cavity block is maintained at about 1 70 C for a much longer period of time than the apparatus of Fig. 1.Thus a more nearly automatic or continuous molding process may be effected by removal of only the bottom portion 2 of the cavity block together with the molded objects after each transfer cycle is completed.
The runner block stays cool, and plunder 16A in its downward position prevents passage of plastic material through the orifice. After the lower cavity block portion 2 has been replaced, plunger 1 6A is raised and then lowered again to force the desired amount of plastic material into the caivty block, where it is heated and liquefied by the hot tip element 18, which is maintained at about 185"C. The plunger 16 comprising plastic ring/tip portions 17 seats in the oridice to maintain high pressure during the curing portion of the cycle.
With the apparatus shown by either of Figs.
1 or 2, the insulating and/or cooling means keep the temperature of the runner block sufficiently low that curing does not take place in the runner block. It is also possible to keep the temperature of the runner block sufficiently low that there is substantially no melting of the plastic material, in which case the feedstock may be unpelletized plastic molding compound.
While the invention has been particularly shown and described with respect to preferred embodiments thereof, it will be understood by those skilled in the art that the foregoing and other changes in form and details may be made therein without departure from the spirit and scope of the invention.
Claims (14)
1. A mold apparatus for transfer molding a plurality of small objects, comprising in combination:
a cavity block comprising a plurality of object cavities;
a runner block comprising a plurality of runner means for supplying plastic molding material to said cavities, and
insulating means between said runner block and said cavity block for maintaining said runner block at a sufficiently low temperature to inhibit curing of said plastic molding material in said runner block.
2. The mold apparatus of Claim 1, further including cooling means for said runner block to inhibit curing of said plastic molding material in said runner block.
3. The mold apparatus of Claim 1, further including local heating means within said cavity block for heating said plastic molding material before it enters said cavities.
4. A mold apparatus for the transfer molding of a plurality of small objects, comprising, in combination;
a cavity block;
a plurality of cavities in said cavity block;
gate means for each of said cavities for admitting plastic molding material to said cavity;
a runner block insulated from said cavity block;
a plurality of runners in said runner block; and
plunger means for admitting plastic molding material from said each of said plurality of runners into said plurality of mold cavities and for maintaining said plastic material under high pressure in said cavities.
5. The mold apparatus of Claim 4, further comprising cooling means for maintaining the temperature of said runner block at a substantially lower value than said cavity block.
6. The mold apparatus of Claim 4, further including localized heating means proximate said gate means for heating said plastic molding material prior to its passage into said mold cavities.
7. The mold apparatus according to Claim 4, wherein said plunger rings comprise plastic tip sealing means.
8. The mold apparatus according to Claim 5, wherein said insulating means and said cooling means substantially prevent curing of said plastic molding material in said runner means.
9. The mold apparatus of Claim 5, where said insulating means and said cooling means substantially prevent liquefication of said plastic molding material in said runner means.
10. The mold apparatus according to
Claim 4, where said cavity block and said runner block comprise separate and detachable members.
11. A method for transfer molding a plurality of small objects in multiple cavities in a heated cavity block comprising supplying plastic molding material to said cavities through a plurality of runners in a runner block while maintaining the temperature of said runner block substantially below that of said cavity block.
12. A mold apparatus for the transfer molding of a plurality of small objects substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
13. The method for transfer molding a plurality of small objects substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
14. Objects manufactured on apparatus or in accordance with the method as claimed in any one of the preceding claims.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US62862184A | 1984-07-06 | 1984-07-06 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8508320D0 GB8508320D0 (en) | 1985-05-09 |
| GB2161107A true GB2161107A (en) | 1986-01-08 |
| GB2161107B GB2161107B (en) | 1988-03-02 |
Family
ID=24519651
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08508320A Expired GB2161107B (en) | 1984-07-06 | 1985-03-29 | Method and apparatus for cold runner transfer molding |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS6120718A (en) |
| DE (1) | DE3524161A1 (en) |
| FR (1) | FR2567064A1 (en) |
| GB (1) | GB2161107B (en) |
| NL (1) | NL8501268A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2198386A (en) * | 1986-09-29 | 1988-06-15 | Alan Harper | Injecting resin |
| WO2007025331A1 (en) * | 2005-08-29 | 2007-03-08 | Romar Engineering Pty Ltd | Injection device for a cold runner block |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3811814C2 (en) * | 1988-04-08 | 1994-08-25 | Siemens Ag | Injection molding device for quartz-filled plastic material |
| JPH0350413U (en) * | 1989-09-21 | 1991-05-16 | ||
| JP2511759Y2 (en) * | 1989-10-02 | 1996-09-25 | 三菱マテリアル株式会社 | Injection mold |
| EP2266776A1 (en) * | 2009-06-27 | 2010-12-29 | Bayer MaterialScience AG | Method and device for producing thick-walled plastic components, in particular optical components |
| WO2017170168A1 (en) * | 2016-03-31 | 2017-10-05 | テルモ株式会社 | Injection molding apparatus |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3591897A (en) * | 1968-11-01 | 1971-07-13 | Osley & Whitney Inc | Runnerless mold for automated injection-molding of thermoset materials |
| GB1397908A (en) * | 1972-08-29 | 1975-06-18 | Uniroyal Ag | Transfer moulding apparatus |
| GB1411837A (en) * | 1972-12-18 | 1975-10-29 | Gen Tire & Rubber Co | Transfer moulding |
| US4089926A (en) * | 1976-09-20 | 1978-05-16 | Taylor Don A | Injection molding method and apparatus |
| EP0013154A1 (en) * | 1978-12-21 | 1980-07-09 | Occidental Chemical Corporation | Method of and apparatus for runnerless injection-compression molding thermosetting materials |
| GB2083402A (en) * | 1980-09-11 | 1982-03-24 | Daniels Engineering Ltd | Moulding machines |
Family Cites Families (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR884925A (en) * | 1940-12-13 | 1943-08-31 | Molding process of artificial materials and metals by extrusion and injection | |
| FR927485A (en) * | 1946-05-29 | 1947-10-30 | Zbrojovka Brno Np | Method and apparatus for the production of molded rubber articles by the injection process |
| CH400553A (en) * | 1962-12-11 | 1965-10-15 | Ankerwerk Gebrueder Goller | Injection molding machine for the production of parts from crosslinking plastics or natural materials |
| FR1546977A (en) * | 1967-01-26 | 1968-11-22 | Eckert & Ziegler Gmbh | Mold for molding machines |
| DE1704014C3 (en) * | 1967-01-26 | 1978-03-16 | Eckert & Ziegler Gmbh, 8832 Weissenburg | Molding tool for processing materials that can be crosslinked when heated, in particular plastics |
| FR2141453B1 (en) * | 1971-06-03 | 1973-06-29 | Gir Pi Plast Ind Gir Sa | |
| US3892512A (en) * | 1973-09-13 | 1975-07-01 | Alan V Diehl | Transfer molding apparatus with resilient pad to distribute molding pressure |
| US3918870A (en) * | 1974-02-13 | 1975-11-11 | Norton Co | Injection molding machine |
| US4017242A (en) * | 1975-10-28 | 1977-04-12 | The Mcdowell-Wellman Engineering Company | Injection molding apparatus |
| EP0010887A1 (en) * | 1978-10-16 | 1980-05-14 | Hooker Chemicals & Plastics Corp. | Method of plunger molding and plunger molding apparatus having temperature controlled runner and sprue portions |
| JPS563145U (en) * | 1979-06-19 | 1981-01-12 | ||
| JPS5620178A (en) * | 1979-07-30 | 1981-02-25 | Asahi Glass Co Ltd | Closely sticking method for ion exchange membrane and electrode |
| JPS5644639A (en) * | 1979-09-20 | 1981-04-23 | Towa Seimitsu Kogyo Kk | Molding method and device for thermosetting synthetic resin |
| US4340353A (en) * | 1980-10-31 | 1982-07-20 | Discovision Associates | Hot sprue valve assembly for an injection molding machine |
| JPS6347952Y2 (en) * | 1981-05-06 | 1988-12-09 | ||
| DE8320638U1 (en) * | 1983-07-18 | 1983-12-01 | Purma Industrieanlagen GmbH, 7100 Heilbronn | TOOL FOR MAKING ELASTIC MOLDED PARTS |
| JPH0772276B2 (en) * | 1986-07-07 | 1995-08-02 | 電源開発株式会社 | A sleeve for preventing dust blockage used in the piping of coal gasifiers |
-
1985
- 1985-03-29 GB GB08508320A patent/GB2161107B/en not_active Expired
- 1985-05-03 NL NL8501268A patent/NL8501268A/en not_active Application Discontinuation
- 1985-05-08 JP JP9767085A patent/JPS6120718A/en active Granted
- 1985-07-04 FR FR8510685A patent/FR2567064A1/en active Pending
- 1985-07-05 DE DE19853524161 patent/DE3524161A1/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3591897A (en) * | 1968-11-01 | 1971-07-13 | Osley & Whitney Inc | Runnerless mold for automated injection-molding of thermoset materials |
| GB1397908A (en) * | 1972-08-29 | 1975-06-18 | Uniroyal Ag | Transfer moulding apparatus |
| GB1411837A (en) * | 1972-12-18 | 1975-10-29 | Gen Tire & Rubber Co | Transfer moulding |
| US4089926A (en) * | 1976-09-20 | 1978-05-16 | Taylor Don A | Injection molding method and apparatus |
| EP0013154A1 (en) * | 1978-12-21 | 1980-07-09 | Occidental Chemical Corporation | Method of and apparatus for runnerless injection-compression molding thermosetting materials |
| GB2083402A (en) * | 1980-09-11 | 1982-03-24 | Daniels Engineering Ltd | Moulding machines |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2198386A (en) * | 1986-09-29 | 1988-06-15 | Alan Harper | Injecting resin |
| WO2007025331A1 (en) * | 2005-08-29 | 2007-03-08 | Romar Engineering Pty Ltd | Injection device for a cold runner block |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2567064A1 (en) | 1986-01-10 |
| NL8501268A (en) | 1986-02-03 |
| GB2161107B (en) | 1988-03-02 |
| DE3524161A1 (en) | 1986-01-23 |
| JPS6315892B2 (en) | 1988-04-06 |
| GB8508320D0 (en) | 1985-05-09 |
| JPS6120718A (en) | 1986-01-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19960329 |