CA1114121A - Apparatus and method for manufacturing thin walled articles from expanded plastics material - Google Patents
Apparatus and method for manufacturing thin walled articles from expanded plastics materialInfo
- Publication number
- CA1114121A CA1114121A CA313,567A CA313567A CA1114121A CA 1114121 A CA1114121 A CA 1114121A CA 313567 A CA313567 A CA 313567A CA 1114121 A CA1114121 A CA 1114121A
- Authority
- CA
- Canada
- Prior art keywords
- mold
- inductor
- circuit
- imprint
- circuits
- 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.)
- Expired
Links
- 239000004033 plastic Substances 0.000 title claims abstract description 21
- 229920003023 plastic Polymers 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000000463 material Substances 0.000 title claims abstract description 7
- 238000004519 manufacturing process Methods 0.000 title abstract description 13
- 239000002184 metal Substances 0.000 claims abstract description 8
- 229910052751 metal Inorganic materials 0.000 claims abstract description 8
- 239000003507 refrigerant Substances 0.000 claims description 6
- 238000000465 moulding Methods 0.000 claims description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical group [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 4
- 229920005989 resin Polymers 0.000 claims description 4
- 239000011347 resin Substances 0.000 claims description 4
- 239000011324 bead Substances 0.000 claims description 3
- 239000004604 Blowing Agent Substances 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 229910001220 stainless steel Inorganic materials 0.000 claims description 2
- 239000010935 stainless steel Substances 0.000 claims description 2
- 239000002826 coolant Substances 0.000 claims 2
- 239000012212 insulator Substances 0.000 claims 1
- 230000008961 swelling Effects 0.000 claims 1
- 235000013351 cheese Nutrition 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000005457 ice water Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- -1 polyethylene terephthalate Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- B29C33/56—Coatings, e.g. enameled or galvanised; Releasing, lubricating or separating agents
-
- 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
- B29C33/02—Moulds or cores; Details thereof or accessories therefor with incorporated heating or cooling means
- B29C33/06—Moulds or cores; Details thereof or accessories therefor with incorporated heating or cooling means using radiation, e.g. electro-magnetic waves, induction heating
-
- 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
-
- 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
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
- B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
- B29C2035/0811—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using induction
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Molding Of Porous Articles (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
DE DIVULGATION : La présente invention est relative à un dispositif et à un procédé de fabrication d'objets à parois minces en matière plastique expansée. Ce dispositif est caractérisé en ce qu'il comprend en association avec un moule à empreinte en métal présentant des pertes par courants de Foucault, au moins un circuit inducteur noyé dans la masse de la matière plastique à ramollir et relié un ou plusieurs générateurs du courant haute-fréquence (HF), ledit circuit se trouvant à une distance de 0,05 à 2 mm de l'empreinte du moule. Application à la fabrication d'objets à parois minces(tels que gobelets, barquettes, etc...) en matière plastique expansée.DISCLOSURE: The present invention relates to a device and a method for manufacturing objects with thin walls in expanded plastic. This device is characterized in that it comprises, in association with a metal impression mold having eddy current losses, at least one inductor circuit embedded in the mass of the plastic material to be softened and connected one or more current generators high frequency (HF), said circuit being at a distance of 0.05 to 2 mm from the mold cavity. Application to the manufacture of thin-walled objects (such as cups, trays, etc.) made of expanded plastic.
Description
DISPOSITIF ET PROCEDE DE FABRICATION D 'OBJETS
A PAROIS MINCES EN MATIERE PLASTIQUE EXPANSEE
_____________ ______ La présente invention est relative à des perfec-tionnements apportés aux dispositifs et aux procédés de fabrication d'objets à parois minces en mati~re plastique expansée.
La présente invention est plus particulièrement re-lative à un procédé de fabrication d'objets tels que gobele-ts, 10 récipients à fromage, barquettes, etc, à parois minces, c'est-à-dire n'excedant pas 5 mm d'epaisseur.
Les gobelets, barquettes et analogues en matière plastique et en particulier en matière plastique expansée, consti- r tuent de nos jours des récipients très largement diffusés et utili-sés. Il sont, en effet, robustes, d'un poids très faible et peuvent etre très facilement réutilisés.
La Demanderesse s'est en conséquence donné pour but d'étudier et de mettre au point un dispositif très simple, très économique et convenant parfaitement aux fabrications en série.
La présente invention a pour objet un dispositif de moulage d'objets à parois minces, en matière plastique expansée, caractérisé en ce qu'il comprend, en combinaison :- un moule en deux parties dont chacune présente un corps en matière plas-tique et une empreinte en métal d'une épaisseur comprise entre ; 0,3 et 1,5 mm présentant des pertes par courants de Foucault ;
- des circuits inducteurs disposés aussi bien sur la partie mâle que sur la partie femelle du moule et à proximité immédiate de l'empreinte susdite, de préference à une distance de 0,05 a 2 mm de cette dernière ; - au moins un générateur de courant haute-fréquence auquel sont reliés les circuits inducteurs susdits~
Suivant un autre mode de réalisation avantageux de l'objet de l'invention, le métal de l'empreinte est en acier inoxydable.
Suivant encore un autre mode de réalisation avan-tageux de l'objet de l'invention, le métal de l'empreinte est en nickel.
Suivant un mode de réalisation préféré du dispositif objet de la présente invention, le circuit inducteur est un circuit tubulaire.
Suivant une disposition avantageuse de ce mode de réalisation, l'on fait circuler un fluide réfrigérant à l'inté- -rieur des tubes du clrcuit inducteur.
Suivant un autre mode de réalisation de l'objet de l'invention, le circuit inducteur tubulaire est recouvert d'un isolant.
La présente invention a également pour objet un ;~ procédé de moulage d'objets en matière plastique à parois minces dans des moules conformes à l'invention, lequel procédé est caractérisé en ce que les perles en matière plastique contenant éventuellement un agent de gonflement et éventuellement préala-blement préexpansées sont introduites dans un moule conforme à
l'invention, constitué en deux parties - mâle et femelle - placé
dans une presse approprié~, en ce que l'on chauffe rapidement l'empreinte en y produisant des courants induits pendant une duree de lJ~ 20 secondes, et en ce que l'on refroidit la matière plastique fondue par circulation d'un liquide refrigérant à
l'intérieur du circuit inducteur.
Suivant un autre mode de réalisation avantageux du procédé objet de la présente invention, le fluide réfrigérant circule dans les tubulures du circuit inducteur de man:ière ininterrompue.
Il est en effet possible de simplifier encore la fabrication de ces gobelets, barquettes et analogues en laissant circuler le liquide réfrigerant sans interxuption pendant toute la durée de la fabrication.
Outre les dispositions qui prëcèdent, l'invention comprend encore d'autres dispositions , caractéristiques et avantages,qui ressortiront de la description qui va suivre.
La présente invention vise plus particulièrement les moules pour ~a fabrication de matières plastiques expansées, i 10 conformes aux dispositions qui précèdent, ainsi que tous instal-i lations, dispositifs, procédés d'ensemble et chaînes de fabrica-tion de corps moulés en matière plastique expansible, dans lesquels sont inclus les dispositifs conformes à la présente in-vention, et les objets moulés ~ parois minces (gobelets, réci- , pients à fromage, barquettes et analogues),obtenus a l'aide des moules et dispositifs conformes à la présente invention.
. I .
L'invention pourra ~tre mieux comprise ~ l'aide du complément de description qui va suivre, qui se réfere au dessin annexé dont la Figure unique représente une vue de détail en coupe d'un moule et de son circuit inducteur, conformes ~ la présente invention.
La Figure unique représentée au dessin annexé est une vue partielle, en coupe d'un moule 6 en résine polyester dont i l'empreinte 8 est réalisée en acier inoxydable de 0,6 mm d'épais-~ seur. A 1 mm de l'empreinte, et noyés dans la resine 9, sont - disposés (aussi bien sur la partie mâle que sur la partie femelle du moule), les circuits inducteurs tubulaires 7 reliés aux géné-rateurs HF1 et HF2. Le refroidissement du moule est assuré par la circulation du fluide réfrigérant entre l'entrée 3 et la sortie 4.
L'installation représentée sur cette Figure constitue .
.
un exemple non limitatlf d'application du dispositif conforme a l'invention a la fabrication d'objets a parois minces, tels que des gobelets. Les perles en matière plastique (par exemple polystyrène) préexpansee prealablement sont introduites par l'injecteur de matiere 10 (les évents sont représentés sur cette Figure en 5), le moule étant fermé. Le circuit inducteur 7 recouvert d'une eouche de TERPHAN (Marque de co~erce de.DU PONT DE NEMOU~S, téréphtalate de polyethylène) de 0,08 mm d'epaisseur touche pr~tique-ment l'empreinte. De l'eau glacée circule a l'intérieur du circuit. On fait passer le courant par l'intermédiaire des géné-rateurs 1 et 2 (de 400 kilohertz) pendant 2 secondes. L'empreinte s'échauffe rapidement, la résine fond et le gobelet prend forme.
Le courant coupé, la circulation ae l'eau glacée refroidit imme-diatement le moule, le gobelet peut être éjecté.
A titre d'exemple non limitatif, une installation com-prenant huit moules montés en carrousel travaillant en continu, permet de fournir plus de 92 000 gobelets par 24 heures. D'autres avantages et non des moindres, résident dans la simplicité du dispositif conforme a l'invention et, partant, dans la modicite des frais d'entretien et de remplacement. Le dispositif conforme a la présente invention permet donc la production en masse et d'une maniere tres économique d'objets a parois minces en matiere plastique expansée.
Ai~si que cela ressort de ce qui precède, l'invention ne se limite nullement a ceux de ses modes de mise en oeuvre, de réalisation et d'application qui viennent d'être décrits de fa~on plus explicite dans ce qui précede ; elle en embrasse, au contraire, toutes les variantes qui peuvent venir a l'esprit du technicien en la matiere, sans s'écarter du cadre, ni de la portée, de la présente invention.
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,. , . . . . .: : . DEVICE AND METHOD FOR MANUFACTURING OBJECTS
THIN WALLS IN EXPANDED PLASTIC MATERIAL
_____________ ______ The present invention relates to perfec-of the devices and processes manufacture of thin-walled plastic objects expanded.
The present invention is more particularly re-lative to a process for manufacturing objects such as gobele-ts, 10 thin-walled cheese containers, tubs, etc.
ie not exceeding 5 mm thick.
Cups, trays and the like plastic and in particular in expanded plastic, nowadays kills very widely used and widely used containers his. They are, in fact, robust, of a very low weight and can be very easily reused.
The Applicant has accordingly set a goal to study and develop a very simple, very economical and ideal for mass production.
The present invention relates to a device for molding of thin-walled objects, of expanded plastic, characterized in that it comprises, in combination: - a mold in two parts, each of which has a plastic body tick and a metal imprint with a thickness between ; 0.3 and 1.5 mm with eddy current losses;
- inductor circuits arranged both on the male part on the female part of the mold and in the immediate vicinity of the aforementioned imprint, preferably at a distance of 0.05 to 2 mm of the latter; - at least one high current generator -frequency to which the above-mentioned inductor circuits are connected ~
According to another advantageous embodiment of object of the invention, the metal of the imprint is steel stainless.
According to yet another embodiment before the object of the invention, the metal of the imprint is nickel.
According to a preferred embodiment of the device object of the present invention, the inductor circuit is a tubular circuit.
According to an advantageous arrangement of this mode of realization, a refrigerant is circulated inside -the tubes of the inductor circuit.
According to another embodiment of the object of the invention, the tubular inductor circuit is covered with a insulating.
The present invention also relates to a ; ~ process for molding thin-walled plastic objects in molds according to the invention, which process is characterized in that the plastic beads containing possibly a blowing agent and possibly prior-clearly pre-expanded are introduced into a mold conforming to the invention, consisting of two parts - male and female - placed in a suitable press ~, in that it heats quickly the imprint by producing induced currents therein during a lJ ~ 20 seconds, and in that the material is cooled plastic melted by circulation of a liquid refrigerant inside the inductor circuit.
According to another advantageous embodiment of the process object of the present invention, the refrigerant circulates in the pipes of the inductor circuit in a manner:
uninterrupted.
It is indeed possible to further simplify the manufacture of these cups, trays and the like leaving circulate the refrigerant without interuption during any the duration of the manufacturing.
In addition to the foregoing provisions, the invention includes other provisions, features and advantages, which will emerge from the description which follows.
The present invention relates more particularly molds for the manufacture of expanded plastics, i 10 in accordance with the above provisions, as well as all links, devices, assembly processes and production lines tion of molded bodies of expandable plastic, in which include the devices conforming to this vention, and molded objects ~ thin walls (cups, reci-, cheese sticks, trays and the like), obtained using molds and devices according to the present invention.
. I.
The invention can be better understood using the additional description which follows, which refers to the drawing attached, the single figure of which represents a detailed view in section of a mold and its inductor circuit, conform ~ la present invention.
The single figure shown in the accompanying drawing is a partial view, in section of a mold 6 in polyester resin, i the impression 8 is made of stainless steel 0.6 mm thick-~ sister. At 1 mm from the imprint, and embedded in the resin 9, are - arranged (both on the male part and on the female part of the mold), the tubular inductor circuits 7 connected to the gener HF1 and HF2 rators. The cooling of the mold is ensured by the circulation of the refrigerant between inlet 3 and the exit 4.
The installation shown in this Figure constitutes .
.
a nonlimiting example of application of the device in accordance with the invention has the manufacture of thin-walled objects, such as goblets. Plastic beads (for example polystyrene) pre-expanded beforehand are introduced by the material injector 10 (the vents are represented on this Figure 5), the mold being closed. The inductor circuit 7 covered with a layer of TERPHAN (Co ~ erce mark of. DU PONT DE NEMOU ~ S, polyethylene terephthalate) 0.08 mm thick lie the imprint. Icy water circulates inside the circuit. We pass the current through the generals rators 1 and 2 (400 kilohertz) for 2 seconds. The imprint heats up quickly, the resin melts and the cup takes shape.
With the power cut, the circulation of ice water cools immme-diat the mold, the cup can be ejected.
By way of nonlimiting example, an installation comprising taking eight molds mounted in a carousel working continuously, provides more than 92,000 cups per 24 hours. Others advantages and not least, lie in the simplicity of the device in accordance with the invention and therefore in modicity maintenance and replacement costs. The compliant device to the present invention therefore allows mass production and very thinly walled objects made of material expanded plastic.
Ai ~ if it emerges from the above, the invention is not limited to those of its modes of implementation, realization and application which have just been described from fa ~ on more explicit in the above; she embraces it, at otherwise, all the variations that can come to mind technician in the matter, without departing from the framework or the scope, of the present invention.
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Claims (10)
- un moule en deux parties dont chacune présente un corps en matière plastique et une empreinte en métal d'une épaisseur comprise entre 0,3 et 1,5 mm présentant des pertes par courants de Foucault; - des circuits inducteurs disposés aussi bien sur la partie mâle que sur la partie femelle du moule et à proximité immédiate de l'empreinte susdite, au moins un générateur de courant haute-fréquence auquel sont reliés les circuits inducteurs susdits. 1. Device for molding thin-walled objects, expanded plastic material, characterized in that it comprises in combination:
- a mold in two parts, each of which has a plastic body and a metal imprint between 0.3 and 1.5 mm thick with eddy current losses; - inductor circuits arranged on both the male and female parts of the mold and in the immediate vicinity of the aforementioned footprint, at least one generator of high-frequency current to which the above-mentioned inductor circuits are connected.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7731404 | 1977-10-19 | ||
| FR7731404A FR2406516A1 (en) | 1977-10-19 | 1977-10-19 | DEVICE AND METHOD FOR MANUFACTURING THIN-WALL OBJECTS IN EXPANDED PLASTIC MATERIAL |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1114121A true CA1114121A (en) | 1981-12-15 |
Family
ID=9196672
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA313,567A Expired CA1114121A (en) | 1977-10-19 | 1978-10-17 | Apparatus and method for manufacturing thin walled articles from expanded plastics material |
Country Status (10)
| Country | Link |
|---|---|
| JP (1) | JPS54108871A (en) |
| BE (1) | BE870720A (en) |
| CA (1) | CA1114121A (en) |
| DE (1) | DE2845193A1 (en) |
| ES (1) | ES473852A1 (en) |
| FR (1) | FR2406516A1 (en) |
| GB (1) | GB2007579B (en) |
| IT (1) | IT1098992B (en) |
| NL (1) | NL7810183A (en) |
| SE (1) | SE7810260L (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5176839A (en) * | 1991-03-28 | 1993-01-05 | General Electric Company | Multilayered mold structure for hot surface molding in a short cycle time |
| US5620636A (en) * | 1991-04-08 | 1997-04-15 | Kanegafuchi Kagaku Kogyo Kabushiki Kaisha | Process for manufacturing foam molded product |
| EP0538475A4 (en) * | 1991-04-08 | 1993-09-08 | Kanegafuchi Kagaku Kogyo Kabushiki Kaisha | Foamed synthetic resin molded product, method of molding said product, and metallic mold for internal foam molding |
| DE19719321C2 (en) * | 1997-05-08 | 2000-12-14 | Mst Automotive Gmbh | Manufacture of a light steering wheel |
| BRPI0918829A2 (en) * | 2008-09-22 | 2017-03-28 | Johnson Controls Tech Co | method of making a foam product |
| DE202009001959U1 (en) * | 2009-03-11 | 2010-07-29 | Kunststoffinstitut für die mittelständische Wirtschaft NRW GmbH | mold |
| AT518100A1 (en) | 2015-12-22 | 2017-07-15 | Fill Gmbh | Process for the production of a shaped body from a particle foam material |
| DE102022205624A1 (en) | 2022-06-01 | 2023-12-07 | Volkswagen Aktiengesellschaft | Device and method for producing a molded part |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3079630A (en) * | 1959-06-18 | 1963-03-05 | Sheffield Plastics Inc | Apparatus and procedure for making expanded resinous containers |
-
1977
- 1977-10-19 FR FR7731404A patent/FR2406516A1/en not_active Withdrawn
-
1978
- 1978-09-25 BE BE1009072A patent/BE870720A/en unknown
- 1978-09-29 SE SE7810260A patent/SE7810260L/en unknown
- 1978-10-02 ES ES473852A patent/ES473852A1/en not_active Expired
- 1978-10-04 IT IT28394/78A patent/IT1098992B/en active
- 1978-10-10 NL NL7810183A patent/NL7810183A/en not_active Application Discontinuation
- 1978-10-17 CA CA313,567A patent/CA1114121A/en not_active Expired
- 1978-10-17 DE DE19782845193 patent/DE2845193A1/en not_active Ceased
- 1978-10-18 GB GB7840945A patent/GB2007579B/en not_active Expired
- 1978-10-19 JP JP12940178A patent/JPS54108871A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| GB2007579A (en) | 1979-05-23 |
| GB2007579B (en) | 1982-03-03 |
| IT7828394A0 (en) | 1978-10-04 |
| NL7810183A (en) | 1979-04-23 |
| FR2406516A1 (en) | 1979-05-18 |
| DE2845193A1 (en) | 1979-04-26 |
| SE7810260L (en) | 1979-04-20 |
| JPS54108871A (en) | 1979-08-25 |
| BE870720A (en) | 1979-03-26 |
| ES473852A1 (en) | 1979-04-16 |
| IT1098992B (en) | 1985-09-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |