GB2040214A - Method of producing moulded articles - Google Patents

Method of producing moulded articles Download PDF

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Publication number
GB2040214A
GB2040214A GB8000132A GB8000132A GB2040214A GB 2040214 A GB2040214 A GB 2040214A GB 8000132 A GB8000132 A GB 8000132A GB 8000132 A GB8000132 A GB 8000132A GB 2040214 A GB2040214 A GB 2040214A
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GB
United Kingdom
Prior art keywords
moulds
mould
web
articles
plastics material
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
Application number
GB8000132A
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GB2040214B (en
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SELLARS D
Original Assignee
SELLARS D
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by SELLARS D filed Critical SELLARS D
Priority to GB8000132A priority Critical patent/GB2040214B/en
Publication of GB2040214A publication Critical patent/GB2040214A/en
Application granted granted Critical
Publication of GB2040214B publication Critical patent/GB2040214B/en
Expired legal-status Critical Current

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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
    • B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
    • B29C67/24—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 characterised by the choice of material
    • B29C67/242—Moulding mineral aggregates bonded with resin, e.g. resin concrete
    • B29C67/243—Moulding mineral aggregates bonded with resin, e.g. resin concrete for making articles of definite length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B5/00—Producing shaped articles from the material in moulds or on moulding surfaces, carried or formed by, in or on conveyors irrespective of the manner of shaping
    • B28B5/04—Producing shaped articles from the material in moulds or on moulding surfaces, carried or formed by, in or on conveyors irrespective of the manner of shaping in moulds moved in succession past one or more shaping stations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/34—Moulds, cores, or mandrels of special material, e.g. destructible materials
    • B28B7/342—Moulds, cores, or mandrels of special material, e.g. destructible materials which are at least partially destroyed, e.g. broken, molten, before demoulding; Moulding surfaces or spaces shaped by, or in, the ground, or sand or soil, whether bound or not; Cores consisting at least mainly of sand or soil, whether bound or not
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/34—Moulds, cores, or mandrels of special material, e.g. destructible materials
    • B28B7/348—Moulds, cores, or mandrels of special material, e.g. destructible materials of plastic material or rubber
    • 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
    • B29C33/0011—Moulds or cores; Details thereof or accessories therefor thin-walled moulds
    • B29C33/0016—Lost moulds, e.g. staying on the moulded object
    • 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
    • B29C33/34—Moulds or cores; Details thereof or accessories therefor movable, e.g. to or from the moulding station
    • B29C33/36—Moulds or cores; Details thereof or accessories therefor movable, e.g. to or from the moulding station continuously movable in one direction, e.g. in a closed circuit
    • 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
    • B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
    • B29C33/40—Plastics, e.g. foam or rubber
    • 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
    • B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
    • B29C37/0003—Discharging moulded articles from 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
    • B29K2825/00—Use of polymers of vinyl-aromatic compounds or derivatives thereof as mould material
    • 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
    • B29K2827/00—Use of polyvinylhalogenides or derivatives thereof as mould material
    • B29K2827/06—PVC, i.e. polyvinylchloride
    • 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
    • B29K2831/00—Use of polyvinylesters or derivatives thereof as mould material
    • 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
    • B29K2833/00—Use of polymers of unsaturated acids or derivatives thereof as mould material
    • B29K2833/04—Polymers of esters
    • B29K2833/12—Polymers of methacrylic acid esters, e.g. PMMA, i.e. polymethylmethacrylate
    • 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
    • B29K2855/00—Use of specific polymers obtained by polymerisation reactions only involving carbon-to-carbon unsaturated bonds, not provided for in a single one of main groups B29K2823/00 - B29K2849/00, e.g. having a vinyl group, as mould material
    • B29K2855/02—ABS polymers, i.e. acrylonitrile-butadiene-styrene polymers

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Ceramic Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Structural Engineering (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)

Abstract

A process for producing moulded articles comprises forming longitudinally spaced moulds for the articles in a web of plastics material, e.g. a thermoplastic material, which is progressively advanced. Hardenable material, for example concrete, may then be introduced into the moulds and hardened to produce the moulded article. The moulds in the web may be produced by feeding the web stepwise to a vacuum forming or pressure forming machine.

Description

SPECIFICATION Method of producing moulded articles The present invention relates to a process and apparatus for the production of moulded articles, particularly, but not exclusively, moulded cementitious articles.
Articles made of cementitious material, e.g. concrete, mortar and like materials, are known for a variety of functional and/or decorative uses. Examples of cementitious articles used in the building and construction industries are decorative wall blocks for screen walling, and reinforcement bar spacers as used for positioning the metal reinforcing bars within shuttering into which concrete is to be poured to produce reinforced concrete.
Cementitious articles such as those examplified above have been produced by a variety of techniques. The cementitious spacers have traditionally been made manually on site by casting in wooden moulds. This is clearly a slow and relatively labour intensive method. An alternative method for the commercial production of spacers, which is also used for producing other cementitious articles, is to use a suitable steel mould which is filled with the cementitious material. The mould may of course be part of a mould tray in which a plurality of such moulds are provided. A disadvantage of this method is that production is limited by the number of the steel moulds, which number is usually kept to a minimum due to expense.With limited availability of moulds it is necessary to use a cementitious composition which allows relatively rapid demoulding in an uncured state so as to free the mould for a further moulding operation. It is however difficult to obtain articles of adequate strength using the relatively dry mixes required for rapid demoulding.
Certain cementitious articles can be produced by extrusion techniques and such techniques favour mass production. However, in the case of cementitious spacers, this technique has a number of disadvantages. Firstly, the use of an extrusion process results in a product having a constant cross-section which means that design freedom for achieving the most favourable weight strength ratio is limited. As a result, a strong, stable spacer is inevitably heavy. Secondly, the choice of cementitious formulations is dictated by the need for the extruded article to be free from slump (loss of shape) as it emerges from the extrusion die and also by the fact that the article is unsupported during its green, partly cured condition. The cementitious composition must therefore be formulated with 5 - 15% asbestos fibres to ensure satisfactory post-extrusion characteristics.
It is an object of the present invention to provide a process and apparatus for producing moulded articles.
According to the present invention there is provided a process for producing moulded articles comprising forming longitudinally spaced moulds for the articles in a web of plastics material which is progressively advanced, introducing hardenable material into said moulds, and hardening said hardenable material to produce said articles.
The invention also provides apparatus for producing moulded articles comprising a mould forming station, means for progressively advancing a web of plastics material to the mould forming station, and means for introducing hardenable material into moulds formed atsaid station.
The materials which may be moulded by the method of the invention are preferably cementitious materials such as concrete, hydraulic concrete, resin bonded concrete and mortar or the like and the invention is particularly applicable to the production of cementitious reinforcement bar spacers and other cementitious moulded articles, e.g. screen blocks.
The invention may also be used for moulding synthetic resins.
Preferably the web is of thermoplastics material and the moulds are produced by vacuum forming or by pressure forming using a suitable mould pattern.
Suitable thermoplastics materials are for example, polystyrene, polyvinyl chloride, acrylonitrile butadiene styrene, polymethyl methacrylate, and polyvinyl acetate. An expanded plastics material may be used as the web. Such material enhances regidity and gives increased protection for the moulded article.
The vacuum or pressure forming technique will generally be effected on a stationary section of the web, and consequently the web will be fed stepwise to the forming machine to allow a semi-continuous production of the moulds. It is of course possible to form a plurality of transversely and/or longitudinally spaced moulds in the web during a single forming operation by providing a plurality of mould patterns in the forming machine and a like plurality of moulds will be produced during each subsequent forming operation.
Once the web leaves the mould formation station, e.g. the above-mentioned vacuum or pressure forming machine, it may if desired be severed at suitable intervals so that a plurality of mould trays are produced which may then be filled with hardenable material in a batchwise number. It is however greatly preferred simply to advance the moulded web to means for introducing hardenable material into the moulds. Preferably such means are capable of introducing hardenable materials simultaneously into a a plurality of moulds. The introduction may be by injection, as will generally be the case when the hardenable material is a cementitious slurry.
During the introduction of the hardenable material, the mould or moulds may be located on a support having a shape complementary to that of the mould base so as to prevent deformation thereof. This is particularly advantageous for the injection of cementitious slurries as it allows the use of higher injection pressures which permit improved compaction and definition of the moulded article.
Once the moulds have been filled, the hardenable material may be hardened in a number of ways. For example, the advancing web may be used as a conveyor belt which travels for a sufficient time to allow curing of the material. In this respect, the advancing web may be passed through an environment promoting rapid curing of the material, e.g. a heated enclosure. Alternatively, or additionally, a fast curing formulation could be used. During the travel of the advancing web it is of course possible to use vibration contacting to improve the properties of the moulded article.
The use of means for promoting curing and/orfast curing compositions allows a faster belt speed to be used and thereby provides an increase in production capacity.
If it is not desired to accelerate curing then it is possible either to have a sufficient length of travel for the web to ensure that curing is complete or, alternatively, to cut the belt into sections containing the uncured products, and to store the sections to allow complete curing to take place.
After the compositions have been cured, it is possible to supply the moulded article in its supporting mould case which will only be stripped away when the article is required for use. This ensures that the moulded article is protected until it is required, and also facilitates handling of the article.
Alternatively, the article may be stripped from the moulding casing by suitable means after it has been cured but before it is supplied to an end user. If this method is to be adopted, a number of possibilities are available for maintaining high production rates and several of these possibilities will be given below by way of example.
Firstly, the plastics material constituting the mould may be subjected to a temperature such that it softens and distorts thus allowing the moulded article to fall free.
Secondly, the moulded article may be ejected from the mould by means of a suitable pusher member. The pusher member may, for example, be a heated ejector pin that melts the base of the mould and pushes out the moulded article. Alternatively, the pusher member may be a device which cuts through the base of the mould before directly pushing the moulded articles.
If polyvinyl acetate is used as the plastic web material, the moulded articles can be removed from the moulds by the action of the water or steam on the polyvinyl acetate.
Once the articles have been stripped from the moulds they may, if they are of suitable composition, be fired as ceramics.
The plastics web material may of course be supplied from a roll. However, it is also possible to provide means for producing plastics web material in situ, e.g. from plastics material removed from the moulds as described above.
It will be appreciated from the foregoing disclosure that the method of the invention is eminently suitable for the mass-production of moulded articles and this is of course primarily achieved by virtue of the continual production, on the web of plastics material, of moulds for producing the moulded articles. For a given speed of the advancing web of plastics material, it is of course possible to increase production by increasing the width of the web and by producing an increased number of moulds across the width of the web, whilst providing, of course, sufficient means to fill the moulds in the same time.
The continual production of coulds in the method of the invention is an advantage because the mould is only required for a single moulding operation and there is no demand for the mould to be used again so that the curing time may be as long as desired.
The process of the invention is versatile since there is no restriction on the hardenable formulations which may be moulded, and the formulation may be chosen to suit any desired end use. For example, in the case of cementitious formulations, it is possible to incorporate reinforcement fillers should these be desired. Alternatively, the hardenable material maybe foamed so as to achieve a reduced density for the moulded article.

Claims (34)

1. A process for producing moulded articles comprising forming longitudinally spaced moulds for the articles in a web of plastics material which is progressively advanced, introducing hardenable material into said moulds, and hardening said hardenable material to produce said articles.
2. A process as claimed in claim 1 wherein the web advances without severing to a downstream of the position at which the hardenable material is introduced into the moulds.
3. A process as claimed in claim 1 or 2 wherein the plastics material is a thermoplastics material.
4. A process as claimed in claim 3 wherein the thermoplastics material is selected from polystyrene, polyvinyl chloride, acrylonitrile butadiene styrene, polymethyl methacrylate, and polyvinyl acetate.
5. A process as claimed in claim 1 wherein the plastics material is an expanded plastics material.
6. A process as claimed in any one of claims 1 to 5 wherein a plurality of transversely spaced moulds are formed simultaneously.
7. A process as claimed in any one of claims 1 to 6 wherein a plurality of longitudinally spaced moulds are formed simultaneously.
8. A process as claimed in any one of claims 1 to 7 wherein the moulds are produced by vacuum forming.
9. A process as claimed in any one of claims 1 to 7 wherein the moulds are produced by pressure forming.
10. A process as claimed in any one of claims 1 to 9 wherein the web of plastics material is advanced stepwise.
11. A process as claimed in any one of claims I to 10 wherein the hardenable material is introduced simultaneously into a plurality of moulds.
12. A process as claimed in any one of claims 1 to 11 wherein, during the introduction of the hardenable material into a mould, the mould is supported by means having a shape complementary to that of the base of the mould.
13. A process as claimed in any one of claims 1 to 12 wherein the plastics material is supplied from a roll.
14. A process as claimed in any one of claims 1 to 12 wherein the plastic web is produced in situ.
15. A process as claimed in claim 14 wherein the plastics web is produced with plastics material remaining after the moulded articles have been removed from the moulds.
16. A process as claimed in any one of claims 1 to 15 wherein the articles are removed from the moulds by heat softening or deforming the moulds.
17. A process as claimed in any one of claims 1 to 15 wherein the articles are removed from the mould by a heated ejection pin which acts through the base of the mould.
18. A process as claimed in claim 1 wherein the plastics material is polyvinyl acetate and the articles ar removed from the mould by the action of water or steam on the polyvinyl acetate.
19. A process as claimed in any one of claims 1 to 18 wherein the hardenable material is a cementitious material.
20. A process as claimed in claim 19 wherein the cementitious material is concrete, hydraulic concrete, resin bonded concrete or mortar.
21. A process as claimed in claim 19 or 20 wherein the moulded article is a reinforcement bar spacer.
22. A process as claimed in claim 19 or 20 wherein the moulded article is a screen walling block.
23.A process as claimed in any one of claims 1 to 18 wherein the hardenable material is a synthetic resin.
24. A process for producing moulded articles substantially as hereinbefore described.
25. Moulded articles when produced by the process of any one of claims 1 to 24.
26. Apparatus for producing moulded articles comprising a mould forming station, means for progressively advancing a web of plastics material to the mould forming station, and means for introducing hardenable material into moulds formed at said station.
27. Apparatus as claimed in claim 26 wherein the mould forming station is capable of simultaneously producing a plurality of transversely spaced moulds in a web of plastics material.
28. Apparatus as claimed in claim 26 or 27 wherein the mould forming station is capable of simultaneously producing a plurality of longitudinally spaced moulds in a web of plastics material.
29. Apparatus as claimed in any one of claims 26 to 28 wherein the mould forming station is a vacuum forming station.
30.Apparatus as claimed in any one of claims 26 to 28 wherein the mould forming station is a pressure forming station.
31. Apparatus as claimed in any one of claims 26 to 30 having means for introducing the hardenable material simultaneously into a plurality of moulds.
32. Apparatus as claimed in any one of claims 26 to 31 having means for removing moulded articles from the moulds.
33. Apparatus as claimed in any one of claims 26 to 32 having means for forming plastics web material in situ.
34. Apparatus for producing moulded articles substantially as hereinbefore described.
GB8000132A 1979-01-10 1980-01-03 Method of producing moulded articles Expired GB2040214B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8000132A GB2040214B (en) 1979-01-10 1980-01-03 Method of producing moulded articles

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB7900927 1979-01-10
GB8000132A GB2040214B (en) 1979-01-10 1980-01-03 Method of producing moulded articles

Publications (2)

Publication Number Publication Date
GB2040214A true GB2040214A (en) 1980-08-28
GB2040214B GB2040214B (en) 1983-01-06

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2555496A1 (en) * 1983-11-30 1985-05-31 Gruet Michel Moulding process using a lost mould
US4702877A (en) * 1985-12-31 1987-10-27 Davis Jr Lindsey B Method for molding concrete blocks or bricks
US4836762A (en) * 1985-12-31 1989-06-06 Davis Jr Lindsey B Apparatus for molding concrete blocks or bricks
US4944907A (en) * 1985-12-31 1990-07-31 Davis Jr Lindsey B Method for molding concrete blocks or bricks
US5057258A (en) * 1989-09-22 1991-10-15 Scuri Vicki B Method for manufacturing elastomeric form liners using segments of tire tread
WO1996023651A2 (en) * 1995-02-02 1996-08-08 Bausch & Lomb Incorporated Method and apparatus for molding contact lenses and making their container
WO2002064349A1 (en) * 2001-02-09 2002-08-22 Grass Concrete Limited Former and method of making the same
EP1237631A1 (en) * 1999-12-17 2002-09-11 Robert B. Evans Non-mold method of forming objects and articles formed thereby
GB2410920B (en) * 2004-01-24 2008-09-03 Full Bar Composite Ltd A method of producing a mould for a product, a method of producing a moulded product and a method of producing a reusable mould
EP2006061A1 (en) * 2007-06-18 2008-12-24 Jose Cantos Torro Case-mould to manufacture rail posts, banisters, bases, pillars, crests and or any other pre-formed concrete, synthetic or similar and the machine for the elaboration of such case-mould after its moulding

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2555496A1 (en) * 1983-11-30 1985-05-31 Gruet Michel Moulding process using a lost mould
US4702877A (en) * 1985-12-31 1987-10-27 Davis Jr Lindsey B Method for molding concrete blocks or bricks
US4836762A (en) * 1985-12-31 1989-06-06 Davis Jr Lindsey B Apparatus for molding concrete blocks or bricks
US4944907A (en) * 1985-12-31 1990-07-31 Davis Jr Lindsey B Method for molding concrete blocks or bricks
US5057258A (en) * 1989-09-22 1991-10-15 Scuri Vicki B Method for manufacturing elastomeric form liners using segments of tire tread
WO1996023651A2 (en) * 1995-02-02 1996-08-08 Bausch & Lomb Incorporated Method and apparatus for molding contact lenses and making their container
WO1996023651A3 (en) * 1995-02-02 1996-10-24 Bausch & Lomb Method and apparatus for molding contact lenses and making their container
EP1237631A1 (en) * 1999-12-17 2002-09-11 Robert B. Evans Non-mold method of forming objects and articles formed thereby
EP1237631A4 (en) * 1999-12-17 2008-01-23 Robert B Evans Non-mold method of forming objects and articles formed thereby
WO2002064349A1 (en) * 2001-02-09 2002-08-22 Grass Concrete Limited Former and method of making the same
GB2410920B (en) * 2004-01-24 2008-09-03 Full Bar Composite Ltd A method of producing a mould for a product, a method of producing a moulded product and a method of producing a reusable mould
EP2006061A1 (en) * 2007-06-18 2008-12-24 Jose Cantos Torro Case-mould to manufacture rail posts, banisters, bases, pillars, crests and or any other pre-formed concrete, synthetic or similar and the machine for the elaboration of such case-mould after its moulding

Also Published As

Publication number Publication date
GB2040214B (en) 1983-01-06

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Date Code Title Description
PE20 Patent expired after termination of 20 years

Effective date: 20000102