CA2036009A1 - Apparatus for molding lost foam pattern sections - Google Patents
Apparatus for molding lost foam pattern sectionsInfo
- Publication number
- CA2036009A1 CA2036009A1 CA002036009A CA2036009A CA2036009A1 CA 2036009 A1 CA2036009 A1 CA 2036009A1 CA 002036009 A CA002036009 A CA 002036009A CA 2036009 A CA2036009 A CA 2036009A CA 2036009 A1 CA2036009 A1 CA 2036009A1
- Authority
- CA
- Canada
- Prior art keywords
- set forth
- internal surface
- conduit
- mold
- internal
- 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.)
- Abandoned
Links
- 239000006260 foam Substances 0.000 title claims abstract description 15
- 238000000465 moulding Methods 0.000 title claims abstract description 11
- 238000013022 venting Methods 0.000 claims abstract description 13
- 238000010114 lost-foam casting Methods 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims abstract description 5
- 239000011324 bead Substances 0.000 claims description 7
- 230000013011 mating Effects 0.000 claims description 5
- 210000000038 chest Anatomy 0.000 description 6
- 238000010276 construction Methods 0.000 description 3
- 238000001746 injection moulding Methods 0.000 description 2
- FBOUIAKEJMZPQG-AWNIVKPZSA-N (1E)-1-(2,4-dichlorophenyl)-4,4-dimethyl-2-(1,2,4-triazol-1-yl)pent-1-en-3-ol Chemical compound C1=NC=NN1/C(C(O)C(C)(C)C)=C/C1=CC=C(Cl)C=C1Cl FBOUIAKEJMZPQG-AWNIVKPZSA-N 0.000 description 1
- 239000000463 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
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/10—Moulds or cores; Details thereof or accessories therefor with incorporated venting means
-
- 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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/36—Feeding the material to be shaped
- B29C44/38—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length
- B29C44/44—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length in solid form
- B29C44/445—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length in solid form in the form of expandable granules, particles or beads
-
- 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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/58—Moulds
- B29C44/588—Moulds with means for venting, e.g. releasing foaming gas
-
- 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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
- B29C44/3415—Heating or cooling
- B29C44/3426—Heating by introducing steam in the mould
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Molding Of Porous Articles (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
Apparatus for molding a foam pattern to be used in a lost foam casting process, the apparatus comprising first and second mold pieces defining a mold cavity, an external parting area surrounding the mold cavity, and an internal parting area surrounded by the mold cavity, and a conduit for venting the internal parting area.
Apparatus for molding a foam pattern to be used in a lost foam casting process, the apparatus comprising first and second mold pieces defining a mold cavity, an external parting area surrounding the mold cavity, and an internal parting area surrounded by the mold cavity, and a conduit for venting the internal parting area.
Description
APPARATUS FOR MOLDING 21[~36~1~)9 LOST FOAM PATTERN SECTIONS
BACKGROUND OF ~rHE INVENTION
The invention relates to injection molding apparatus, and more particularly to apparatus for molding evaporable foam patterns to be used in a lost foam casting process. Still more particularly, the invention relal:es to such apparatus including an internal parting area.
Conventional apparatus for injection molding lost foam patterns includes first and second mold pieces which mate to define therebetween a mold cavity. In the case of such mold pieces defining an annular or endless mold cavity, the mold pieces have substantially abutting or mating surface portions surrounded by the mold cavity. These surface portions define what is known as an internal parting area, i.e., a parting ar~ea that is surrounded by the mold cavity. The mold pieces also have substantially abutting or mating surface portions located exteriorly of the mold cavity. These surface portions define what is known as an external parting area.
It is known to provide ventinq in an external parting area by providing vent grooves in the mating surface portion of at least one of the mold pieces. These grooves are typically approximately .010 inches deep and .500 inches wide and extend from the mold cavity to the peripher~ of the mold piece. Such vents aid in filling the mold cavity with foam beads by allowing air transporting the beads into the mold cavity to escape from thle mold cavity.
BACKGROUND OF ~rHE INVENTION
The invention relates to injection molding apparatus, and more particularly to apparatus for molding evaporable foam patterns to be used in a lost foam casting process. Still more particularly, the invention relal:es to such apparatus including an internal parting area.
Conventional apparatus for injection molding lost foam patterns includes first and second mold pieces which mate to define therebetween a mold cavity. In the case of such mold pieces defining an annular or endless mold cavity, the mold pieces have substantially abutting or mating surface portions surrounded by the mold cavity. These surface portions define what is known as an internal parting area, i.e., a parting ar~ea that is surrounded by the mold cavity. The mold pieces also have substantially abutting or mating surface portions located exteriorly of the mold cavity. These surface portions define what is known as an external parting area.
It is known to provide ventinq in an external parting area by providing vent grooves in the mating surface portion of at least one of the mold pieces. These grooves are typically approximately .010 inches deep and .500 inches wide and extend from the mold cavity to the peripher~ of the mold piece. Such vents aid in filling the mold cavity with foam beads by allowing air transporting the beads into the mold cavity to escape from thle mold cavity.
-2- 2~3~9 Attention is directed to the following U.S. Patents:
Bucy 3,529,657 Sept. 22, 1970 Cotterell 3,941,528 Mar. 2, 1976 Holmes 4,374,636 Feb. 22, 1983 Bartley, et al. 4,447,197 Nay 8, 1984 Strausfeld 4,496,300 Jan. 29, 1985 Smith 4,573,900 Mar. 4, 1986 Amory, et al. 4,681,527 Jul. 21, 1987 SUMI!~RY OF THE INVENTION
The invention provides apparatus for molding a foam pattern to be used in a lost foam casting process, the apparatus comprising first and second mold pieces defining a mold cavity, and an internal parting area, and means for venting the internal parting area.
The invention also provides molding apparatus comprising first and second mold pieces defining an endless mold cavity, the mold pieces including mating surface portions which are surrounded by the mold cavity and which define therebetween a space, and means for venting the space.
The invention also provides molding apparatus comprising first and second mold pieces defining a mold cavi~y and including respective first and second internal surface portions defining an internal parting area, the first internal surface portion including a radially outer portion spaced a first distance from the second internal surface portion, and a radially inner portion spaced a second distance greater than the first distance from the second internal surface portion so as to define a space between the radially inner portion and the second internal surface portion, and means for venting the space.
60C:~9 A principal feature of the invention i6 the provision of means for venting an internal parting area of a molding apparatus. This arrangement has been found to improve the quality of foam fill adjacent the internal parting area.
Other features and advantages of the invention will become apparent to those skilled in the art upon review of the following detailed description, claims and drawings.
DESCRIPTION OF THE DRAWINGS
Fig. 1 is an elevational view, partially in section, of an apparatus embodying the invention.
Fig~.2 is a view taken along line 2-2 in Fig. 1.
Fig. 3 is a view taken along line 3-3 in Fig. 1.
Fig. 4 is a view taken along line 4-4 in Fig. 1.
Fig. 5 is a view taken along line 5-5 in Fig. 3.
Before one embodiment. of the invention i9 explained in de~ail, it is to be understood that the invention is not limited in its application to the details of the construction and the arrangements of components set forth in the following description or illustrated in ~he drawings. The invention is capable of other embodiments and of being practiced or being carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting.
~4~ 20360~9 DESCRIPTION OF THE PREFE~RED EMBODIMENT
An apparatus 10 embedying the invention is illustrated in the drawings. Conventional portions of the apparatus 10 are i7lustrated schematically.
~ he a~paratus 10 comprises (see Fiy. 1) first and second or upper and lower steam chests 14 and 18, respectively. Each of the steam chests 14 and 18 has extending therethrough a plurality of coolinq lines 22, as is known in the art. Supported by the first steam chest 14 is an upper or first mold piece 26 including a first mold surface 30.
Supported by the second steam chest 18 is a lower or second mold piece 34 having a second mold surface 38 engageable with the first mold surface 30 to define therebetween an annular mold cavity 42. The first mold surface 30 includes a generally circular internal portion 46 (Figs. 1 and 3) surrounded by the mold cavity 42, and an annular or endless external portion 50 (Fig. 1) surrounding the mold cavity 42. The second mold ~urface 38 includes a generally circular internal portion 54 (Figs. 1 and 4) which is surrounded by the mold cavity 42 and which mates with the internal portion 46 of the first mold surface 30. The second mold surface 38 also includes (see Fig. 1) an annular or endless external portion 58 which surrounds the mold cavity 42 and which mates with the external portion 50 of the first mold surface 30.
The internal surface portions 46 and 54 of the mold surfaces 30 and 38 define (see Fig. 1) an internal parting area 62 of the mold surfaces 30 and 38. As described in greater detail below, the internal surface portions 46 and 54 are at 20360~9 least in part very slightly spaced from each other so that air can flow between the internal surface portions 46 and 54.
Thus, a small space exists between the internal surface portions 46 and 54.
The apparatus lO also comprises (see Fig. l) means 66 for supplying foam beads or other suitable moldable material to the mold cavity 42. Such means 66 is known in the art and will not be described in greater detail.
The apparatus 10 also comprises (see Fig. 2) external means 70 for venting the mold cavity 42. While various suitable means can be employed, in the illustrated construction, such means 70 includes a plurality of shallow grooves 74 located in the external portion 50 of the first mold surface 30. Such venting grooves 74 are known in the art and will not be described in greater detail.
The apparatus lO also comprises (see Fig. 1) means for venting the internal parting area 62 of the mold pieces, i.e., for venting the space between the internal surface portions 46 and 54. Preferably, such means includes a conduit 78 having one end 8~ communicating with the internal parting area 62 and an opposite end 86 communicating with the exterior of the apparatus 10. In the illustrated constxuction, the conduit 78 is supported by the upper steam chest 14 and by the upper mold piece 26. The end 82 of the conduit 78 extends through the upper mold piece 26 to the internal parting area 62, and the end 86 of the conduit 78 extends through the upper steam chest 14 to the atmosphere. The conduit 78 allows air in the mold cavity 42 to escape into the ~pace between the internal surface ;2036009 portions 46 and 54 and then through the conduit 78 to the atmosphere.
Preferably, the internal surface portion of one of the mold pieces 26 and 34 is relievecl to assist venting. In the illustrated construction, as shown in Figs. 3 and 5, the internal surface portion 46 of the mold surface 30 includes a radially outer portion 90 which is located ad~acent and extends radially inwardly of the mold cavity 42 and which is spaced a relatively small distance (e.g., .01 inches) from the internal surface portion 54 of the mold surface 38. The internal surface portion 46 of the mold surface 30 also includes a radially inner portion 94 which is relieved, i.e., which i~
spaced a greater distance (e.g., between .125 and .250 inches) from the internal surface portion 54 of the mold surface 38.
The conduit 78 preferably extends through the center of the radially inner portion 94 and communicates directly with the space between the radially inner portion 94 and the internal surface portion 54. The space between the radially outer portion 90 and the internal surface portion 54 is wide enough to permit air to flow out of the mold cavity 4~ to the conduit 78 but is narrow enough to substantially prevent foam beads from flowing into the space between the surface portions 46 and 54. The increlased space between the radially inner portion 94 and the internal surface portion 54 provides improved air flow into the conduit 72.
Various features of the invention are set forth in the following claims.
Bucy 3,529,657 Sept. 22, 1970 Cotterell 3,941,528 Mar. 2, 1976 Holmes 4,374,636 Feb. 22, 1983 Bartley, et al. 4,447,197 Nay 8, 1984 Strausfeld 4,496,300 Jan. 29, 1985 Smith 4,573,900 Mar. 4, 1986 Amory, et al. 4,681,527 Jul. 21, 1987 SUMI!~RY OF THE INVENTION
The invention provides apparatus for molding a foam pattern to be used in a lost foam casting process, the apparatus comprising first and second mold pieces defining a mold cavity, and an internal parting area, and means for venting the internal parting area.
The invention also provides molding apparatus comprising first and second mold pieces defining an endless mold cavity, the mold pieces including mating surface portions which are surrounded by the mold cavity and which define therebetween a space, and means for venting the space.
The invention also provides molding apparatus comprising first and second mold pieces defining a mold cavi~y and including respective first and second internal surface portions defining an internal parting area, the first internal surface portion including a radially outer portion spaced a first distance from the second internal surface portion, and a radially inner portion spaced a second distance greater than the first distance from the second internal surface portion so as to define a space between the radially inner portion and the second internal surface portion, and means for venting the space.
60C:~9 A principal feature of the invention i6 the provision of means for venting an internal parting area of a molding apparatus. This arrangement has been found to improve the quality of foam fill adjacent the internal parting area.
Other features and advantages of the invention will become apparent to those skilled in the art upon review of the following detailed description, claims and drawings.
DESCRIPTION OF THE DRAWINGS
Fig. 1 is an elevational view, partially in section, of an apparatus embodying the invention.
Fig~.2 is a view taken along line 2-2 in Fig. 1.
Fig. 3 is a view taken along line 3-3 in Fig. 1.
Fig. 4 is a view taken along line 4-4 in Fig. 1.
Fig. 5 is a view taken along line 5-5 in Fig. 3.
Before one embodiment. of the invention i9 explained in de~ail, it is to be understood that the invention is not limited in its application to the details of the construction and the arrangements of components set forth in the following description or illustrated in ~he drawings. The invention is capable of other embodiments and of being practiced or being carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting.
~4~ 20360~9 DESCRIPTION OF THE PREFE~RED EMBODIMENT
An apparatus 10 embedying the invention is illustrated in the drawings. Conventional portions of the apparatus 10 are i7lustrated schematically.
~ he a~paratus 10 comprises (see Fiy. 1) first and second or upper and lower steam chests 14 and 18, respectively. Each of the steam chests 14 and 18 has extending therethrough a plurality of coolinq lines 22, as is known in the art. Supported by the first steam chest 14 is an upper or first mold piece 26 including a first mold surface 30.
Supported by the second steam chest 18 is a lower or second mold piece 34 having a second mold surface 38 engageable with the first mold surface 30 to define therebetween an annular mold cavity 42. The first mold surface 30 includes a generally circular internal portion 46 (Figs. 1 and 3) surrounded by the mold cavity 42, and an annular or endless external portion 50 (Fig. 1) surrounding the mold cavity 42. The second mold ~urface 38 includes a generally circular internal portion 54 (Figs. 1 and 4) which is surrounded by the mold cavity 42 and which mates with the internal portion 46 of the first mold surface 30. The second mold surface 38 also includes (see Fig. 1) an annular or endless external portion 58 which surrounds the mold cavity 42 and which mates with the external portion 50 of the first mold surface 30.
The internal surface portions 46 and 54 of the mold surfaces 30 and 38 define (see Fig. 1) an internal parting area 62 of the mold surfaces 30 and 38. As described in greater detail below, the internal surface portions 46 and 54 are at 20360~9 least in part very slightly spaced from each other so that air can flow between the internal surface portions 46 and 54.
Thus, a small space exists between the internal surface portions 46 and 54.
The apparatus lO also comprises (see Fig. l) means 66 for supplying foam beads or other suitable moldable material to the mold cavity 42. Such means 66 is known in the art and will not be described in greater detail.
The apparatus 10 also comprises (see Fig. 2) external means 70 for venting the mold cavity 42. While various suitable means can be employed, in the illustrated construction, such means 70 includes a plurality of shallow grooves 74 located in the external portion 50 of the first mold surface 30. Such venting grooves 74 are known in the art and will not be described in greater detail.
The apparatus lO also comprises (see Fig. 1) means for venting the internal parting area 62 of the mold pieces, i.e., for venting the space between the internal surface portions 46 and 54. Preferably, such means includes a conduit 78 having one end 8~ communicating with the internal parting area 62 and an opposite end 86 communicating with the exterior of the apparatus 10. In the illustrated constxuction, the conduit 78 is supported by the upper steam chest 14 and by the upper mold piece 26. The end 82 of the conduit 78 extends through the upper mold piece 26 to the internal parting area 62, and the end 86 of the conduit 78 extends through the upper steam chest 14 to the atmosphere. The conduit 78 allows air in the mold cavity 42 to escape into the ~pace between the internal surface ;2036009 portions 46 and 54 and then through the conduit 78 to the atmosphere.
Preferably, the internal surface portion of one of the mold pieces 26 and 34 is relievecl to assist venting. In the illustrated construction, as shown in Figs. 3 and 5, the internal surface portion 46 of the mold surface 30 includes a radially outer portion 90 which is located ad~acent and extends radially inwardly of the mold cavity 42 and which is spaced a relatively small distance (e.g., .01 inches) from the internal surface portion 54 of the mold surface 38. The internal surface portion 46 of the mold surface 30 also includes a radially inner portion 94 which is relieved, i.e., which i~
spaced a greater distance (e.g., between .125 and .250 inches) from the internal surface portion 54 of the mold surface 38.
The conduit 78 preferably extends through the center of the radially inner portion 94 and communicates directly with the space between the radially inner portion 94 and the internal surface portion 54. The space between the radially outer portion 90 and the internal surface portion 54 is wide enough to permit air to flow out of the mold cavity 4~ to the conduit 78 but is narrow enough to substantially prevent foam beads from flowing into the space between the surface portions 46 and 54. The increlased space between the radially inner portion 94 and the internal surface portion 54 provides improved air flow into the conduit 72.
Various features of the invention are set forth in the following claims.
Claims (20)
1. Apparatus for molding a foam pattern to be used in a lost foam casting process, said apparatus comprising first and second mold pieces defining a mold cavity, and an internal parting area, and means for venting said internal parting area.
2. Apparatus as set forth in Claim 1 wherein said means includes a conduit extending between said internal parting area and the exterior of said apparatus.
3. Apparatus as set forth in Claim 2 wherein said conduit includes one end extending through one of said mold pieces and communicating with said internal parting area.
4. Apparatus as set forth in Claim 3 and further comprising a steam chest supporting said one of said mold pieces, and wherein said conduit is also supported by said steam chest.
5. Apparatus as set forth in Claim 4 and further comprising means for supplying foam beads to said mold cavity.
6. Apparatus a set forth in Claim 3 wherein one of said mold pieces is relieved adjacent said one end of said conduit.
7. Apparatus as set forth in Claim 3 wherein said first and second mold pieces include respective first and second internal surface portions defining said internal parting area, wherein said first internal surface portion includes a radially outer portion spaced a first distance from said second internal surface portion, and a radially inner portion spaced a second distance greater than said first distance from said second internal surface portion so as to define a space between said radially inner portion and said second internal surface portion, and wherein said one end of said conduit communicates directly with said space.
8. Apparatus for molding an evaporable foam pattern to be used in a lost foam casting processes, said apparatus comprising first and second mold pieces defining an endless mold cavity, said mold pieces including mating surface portions which are surrounded by said mold cavity and which define therebetween a space, and means for venting said space.
9. Apparatus as set forth in Claim 8 wherein said means includes a conduit extending between said internal parting area and the exterior of said apparatus.
10. Apparatus as set forth in Claim 9 wherein said conduit includes one end extending through one of said mold pieces and communicating with said internal parting area.
11. Apparatus as set forth in Claim 10 and further comprising a steam chest supporting said one of said mold pieces, and wherein said conduit is also supported by said steam chest.
12. Apparatus as set forth in Claim 8 and further comprising means for supplying foam beads to said mold cavity.
13. Apparatus a set forth in Claim 10 wherein one of said mold pieces is relieved adjacent said one end of said conduit.
14. Apparatus as set forth in Claim 10 wherein said first and second mold pieces include respective first and second internal surface portions defining said internal parting area, wherein said first internal surface portion includes a radially outer portion spaced a first distance from said second internal surface portion, and a radially inner portion spaced a second distance greater than said first distance from said second internal surface portion so as to define a space between said radially inner portion and said second internal surface portion, and wherein said one end of said conduit communicates directly with said space.
15. Molding apparatus comprising first and second mold pieces defining a mold cavity and including respective first and second internal surface portions defining an internal parting area, said first internal surface portion including a radially outer portion spaced a first distance from said second internal surface portion, and a radially inner portion spaced a second distance greater than said first distance from said second internal surface portion so as to define a space between said radially inner portion and said second internal surface portion, and means for venting said space.
16. Apparatus as set forth in Claim 15 wherein said means includes a conduit extending between said space and the exterior of said apparatus.
17. Apparatus as set forth in Claim 16 wherein said conduit includes one end extending through one of said mold pieces and communicating with said space.
18. Apparatus as set forth in Claim 17 and further comprising a steam chest supporting said one of said mold pieces, and wherein said conduit is also supported by said steam chest.
19. Apparatus as set forth in Claim 18 and further comprising means for supplying foam beads to said mold cavity.
20. Apparatus as set forth in Claim 17 wherein said one end of said conduit communicates directly with said space.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US50412190A | 1990-04-02 | 1990-04-02 | |
| US504,121 | 1990-04-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2036009A1 true CA2036009A1 (en) | 1991-10-03 |
Family
ID=24004932
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002036009A Abandoned CA2036009A1 (en) | 1990-04-02 | 1991-02-08 | Apparatus for molding lost foam pattern sections |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPH04223122A (en) |
| BE (1) | BE1004254A5 (en) |
| CA (1) | CA2036009A1 (en) |
| DE (1) | DE4109940A1 (en) |
| GB (1) | GB2242644B (en) |
| IT (1) | ITRM910149A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4201096C2 (en) * | 1992-01-17 | 1994-02-24 | Grauf Guenter | Mold for the production of foam moldings |
| US5356580A (en) * | 1992-09-02 | 1994-10-18 | Woodbridge Foam Corp. | Method of using a vented mold |
| US5316700A (en) * | 1992-11-02 | 1994-05-31 | Wesley-Jessen Corporation | Method and apparatus for removing excess lens forming material |
| GB9414708D0 (en) * | 1994-07-21 | 1994-09-07 | Portakabin Ltd | Method of and apparatus for making a building panel |
| DE19500601C2 (en) * | 1995-01-11 | 1998-11-05 | Notar Walter | Method and device for producing molded parts from foamed plastic and their use |
| TWI614113B (en) | 2014-09-30 | 2018-02-11 | Panasonic Intellectual Property Management Co., Ltd. | Injection mold and filter molded product |
| CN104439058A (en) * | 2014-12-06 | 2015-03-25 | 沈阳工业大学 | Lost foam white type manufacturing mold for agricultural power shovel point |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB667861A (en) * | 1949-08-04 | 1952-03-12 | Wingfoot Corp | Venting of foamed latex molds |
| DE2327268A1 (en) * | 1973-05-29 | 1975-01-02 | Otto Waldmann | METHOD AND DEVICE FOR MANUFACTURING SHAPED BODIES FROM EXPANDABLE POLYSTYRENE FOAM |
| DE2544714A1 (en) * | 1975-10-07 | 1977-04-21 | Hans Erlenbach | DEVICE FOR THE PRODUCTION OF MOLDINGS FROM FOAMABLE THERMOPLASTIC PLASTIC |
| JPS63247015A (en) * | 1987-04-03 | 1988-10-13 | Inoue Mtp Co Ltd | Mold for reaction injection molding |
| JPS63309416A (en) * | 1987-06-12 | 1988-12-16 | Toyota Motor Corp | Vacuum injection molding equipment |
-
1991
- 1991-02-08 CA CA002036009A patent/CA2036009A1/en not_active Abandoned
- 1991-02-11 GB GB9102860A patent/GB2242644B/en not_active Expired - Fee Related
- 1991-03-05 IT IT000149A patent/ITRM910149A1/en not_active IP Right Cessation
- 1991-03-20 BE BE9100258A patent/BE1004254A5/en not_active IP Right Cessation
- 1991-03-26 DE DE4109940A patent/DE4109940A1/en not_active Withdrawn
- 1991-04-02 JP JP3069942A patent/JPH04223122A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| BE1004254A5 (en) | 1992-10-20 |
| DE4109940A1 (en) | 1991-10-10 |
| JPH04223122A (en) | 1992-08-13 |
| GB9102860D0 (en) | 1991-03-27 |
| ITRM910149A1 (en) | 1991-10-03 |
| GB2242644A (en) | 1991-10-09 |
| GB2242644B (en) | 1993-07-21 |
| ITRM910149A0 (en) | 1991-03-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |