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WO2008011862A1 - Procédé de fabrication d'un article en matériau plastique pourvu d'un espace creux - Google Patents

Procédé de fabrication d'un article en matériau plastique pourvu d'un espace creux Download PDF

Info

Publication number
WO2008011862A1
WO2008011862A1 PCT/DE2007/001233 DE2007001233W WO2008011862A1 WO 2008011862 A1 WO2008011862 A1 WO 2008011862A1 DE 2007001233 W DE2007001233 W DE 2007001233W WO 2008011862 A1 WO2008011862 A1 WO 2008011862A1
Authority
WO
WIPO (PCT)
Prior art keywords
cavity
fluid
intermediate product
article
plastic
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.)
Ceased
Application number
PCT/DE2007/001233
Other languages
German (de)
English (en)
Inventor
Friedhelm Beckmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MoellerTech GmbH
MollerTech GmbH
Original Assignee
MoellerTech GmbH
MollerTech GmbH
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
Priority claimed from DE102006034953A external-priority patent/DE102006034953A1/de
Application filed by MoellerTech GmbH, MollerTech GmbH filed Critical MoellerTech GmbH
Priority to AT0933607A priority Critical patent/AT508511B1/de
Priority to EP07801140A priority patent/EP2046552A1/fr
Publication of WO2008011862A1 publication Critical patent/WO2008011862A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • 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
    • B29C44/583—Moulds for making articles with cavities

Definitions

  • the invention relates to a method for producing an article with a cavity made of a plastic material, in particular plastic hollow profile.
  • the introduction of the pressurized fluid after a partial filling of the mold cavity with the plastic melt which feels that in the core melt volume volume is displaced and by the displacement of the meltdown the rest cavity of the tool, which was still free after the partial filling, also filled and thus the article to be produced is formed.
  • a disadvantage of the method is that the connection of the pressurized fluid leads to a visible disturbance of the surface of the manufactured article, as the
  • Front of the introduced plastic melt briefly comes to a halt during the connection of the fluid in the mold cavity and is then moved by the fluid further in the flow direction.
  • the document EP 0 714 745 B1 describes a method in which a foam-forming liquid is injected into the thick-walled area of a molded part in order to avoid sink marks.
  • the injection of a foam-forming liquid, which is usually used as propellant is denoted in a mass flow leads to an uneven distribution in the Runststoffschmelze, especially at a degree of filling of the mold cavity of> 90%, especially if the lying behind the injection sites areas are no longer available.
  • the foam formation leads at best to a volume compensation during shrinkage, so that in the manufactured article no continuous
  • Cavity arises, but only a few small self-contained cavities, which are commonly referred to as voids.
  • the object of the invention is to provide a method for producing an article with a cavity made of a plastic material, in which in the course of production on the article surface resulting surface defects, such as switching marks, better avoided.
  • a method for producing an article with a cavity made of a plastic material, in particular a plastic hollow profile, in which: in a tool cavity forming the article, after introducing a foaming plastic melt containing a blowing agent, an intermediate product with wall sections and one of formed by the foamable plastic melt is at least partially foamed in the mold cavity, at a further processing of the intermediate product is generated by a wall at least partially surrounded cavity by a pressurized fluid in is introduced into the interior, and after the further processing of the intermediate product, which further comprises a cooling process, the article is removed from the cavity with the tool cavity.
  • a method for producing an article with a cavity made of a plastic material is provided, in particular
  • Plastic film profile in which: an intermediate product having wall sections and an inner region at least partially surrounded by the wall sections is formed in a tool cavity forming the article, a cavity at least partially surrounded by a wall is produced during further processing of the intermediate product by having a with
  • Pressurized and heated over room temperature fluid is introduced in the inner region, and after the further processing of the intermediate product, which further comprises a cooling process, the article is removed from the cavity with the mold cavity
  • the quality of the wall of the article is optimized.
  • the result is a uniform article surface on which disturbances, such as occur in the prior art, for example in the form of switching marks, are avoided, in particular even with thin wall thicknesses.
  • the wall of the article is formed by pressed by the introduction of the fluid, the wall portions of the antipro- product against the inner wall of the horrkavtician and are compressed, at least to the extent that any surface defects in the outer surface of the wall sections of the intermediate product be eliminated.
  • a compression or compression optionally generated by the introduced fluid may also the wall thickness of the wall can be minimized.
  • Room temperature is usually defined as a temperature of 23 0 C.
  • Contour regions of the article which are of the intermediate product only in a preform or not included is executed.
  • An advantageous development of the invention provides that the Irmen Scheme of the intermediate product is at least partially generated as an intermediate product cavity by a part of the introduced plastic melt is displaced from the horrkavtician again when forming the intermediate product by means of an injection fluid introduced in the mold cavity.
  • the extent to which plastic melt is subsequently displaced again is in particular controllable at which point in time the introduction of the injection fluid is started.
  • the cavity of the article to be produced can thus be preformed in an optimized manner.
  • it is preferably provided that a liquid, a gas or steam is used as the injection fluid. In this way, the known technologies according to the internal gas pressure method and the water injection method can be used.
  • the inner region of the intermediate product is formed integrally foamed internal structures. Furthermore, it can be provided that the wall sections of the intermediate product are formed externally foamed structures. In one embodiment of the invention, the inner foamed structures having a coarser pore structure are preferably formed as the outer foamed structures. Alternatively or optionally combined, these process designs enable the formation of an intermediate product and ultimately an article with application-related properties in terms of shape and structure.
  • the inner foamed structures at least partially in the
  • rising it is meant here that the pores of the foamed structures are broken up and thus together with other hollow space structures form a common larger cavity.
  • This is further optimized in an expedient development of the invention in that in the article, the cavity is formed as a substantially free of the foamed structures cavity, which contributes to further Gewichstminderung.
  • blowing agent added amount of blowing agent is provided in a preferred development of the invention that as a foamable plastic melt containing a carrier material plastic melt is introduced, wherein the carrier material is mixed into the plastic melt and loaded with the propellant.
  • a carrier material a material selected from among The following group of materials are used: woody constituents of annual plants (cockroaches), a superabsorbent polymer material and a mixture thereof. These support materials are particularly suitable when using water as a blowing agent.
  • Cockroaches have the advantage that they can absorb a liquid, in particular water, in an amount up to five times their own weight and still remain free-flowing.
  • the cockroaches can be adjusted in their degree of fineness by upstream pretreatment steps, the degree of fineness of the particles advantageously being between pulverulent and a maximum length of about 15 mm to about
  • the fine-grained components of the cockroaches serve as crystallization accelerators (nucleating agents for crystals in crystalline materials) and thus improve the material properties.
  • the annual plants are, for example, hemp, jute, sisal or kenaf, but also oil or miscanthus.
  • a superabsorbent polymer material may be admixed, in particular a crosslinked polyacrylic acid.
  • Particles of natural and / or synthetic superabsorbent materials may be used.
  • Synthetic superabsorbent materials have the advantage that they are resistant even at higher temperatures compared to natural superabsorbent materials, so that higher foaming temperatures are made possible.
  • Superabsorbent polymer materials can absorb large quantities of liquids, especially water, thereby swelling.
  • Superabsorbent polymer materials are cross-linked, insoluble polymers which due to their structure
  • hydrogels Many of their own weight can absorb water or aqueous solutions. Due to the swelling process, a hydrogel is formed. For the formation of hydrogels, all crosslinked polymers are capable of obtaining enough polar groups. Superabsorbent polymer materials are available. tion, which can absorb up to a thousand times their own weight of liquid. In this way it is possible to keep the amount of the carrier material which is admixed low.
  • blowing agent used is a blowing agent selected from the following group of blowing agents: chemical blowing agent, physical blowing agent and a mixture thereof.
  • chemical blowing agents have the advantage that they lead to a wide range of variation of the reaction temperature by mixing different propellant substances, so that the processing is relatively simple on appropriately designed production machines.
  • a disadvantage of such blowing agents is that after the reaction during foaming residual substances remain in the foamed material and influence its properties.
  • Physical propellants typically result in finer foamed structures in the manufactured component or article, but homogeneous incorporation of physical blowing agents into a plasticized plastic is much more difficult than is the case with chemical blowing agents.
  • An advantageous embodiment of the invention provides that with the fluid from the intermediate product enclosed plastic part is displaced from the horrkavtician. As a result, the amount of plastic covered by the article can be further reduced, thereby making the article lighter.
  • the displacement of plastic by means of the heated fluid is achieved, for example, that the
  • Fluid is introduced before the plastic melt is cooled in the interior of the intermediate product.
  • a still plastic soul of the inner area partially surrounded by the wall sections can be displaced.
  • this is achieved alternatively or in reinforced form, by introducing the fluid at a temperature corresponding to at least one melting temperature of the plastic material.
  • the fluid is also the possibility to keep areas of the intermediate product in the molten state or bring it back into this state, thereby displacing a larger proportion of the introduced plastic melt subsequently, resulting in lower
  • Wall thicknesses of the manufactured article leads.
  • an expedient development of the invention may provide that fluid is introduced at a temperature which is lower than the melting temperature of the plastic material. In this way, the pressurized fluid simultaneously fulfills a cooling function.
  • An expedient embodiment of the invention provides that a heated liquid, a heated gas or a heated steam is used as the fluid.
  • a heated steam is used.
  • steam it is possible to vary this up to the critical point at 374 0 C and 271.2bar in the range of the boiling point curve of water in terms of pressure and temperature, so in the so-called subcritical range, the parameters of the manufactured article and to adapt the plastic material used.
  • An expedient development of the invention provides that the wall at least partially surrounding the cavity of the article is formed with a predetermined wall thickness by pressure and / or temperature values of the fluid can be adjusted. By adjusting certain pressure and / or temperature values of the introduced fluid, the way in which the fluid is influenced in the course of -the
  • the wall is formed with wall sections having a different wall thickness. In this way it is possible to produce articles with different wall thicknesses.
  • the wall thickness can be determined in particular by the structural design of the horrkavtician.
  • a further weight reduction of the article is achieved in an expedient development of the invention in that the wall is formed with foamed wall structures.
  • the cavity of the article may be formed in a preferred embodiment of the invention as a substantially continuous cavity.
  • a substantially contiguous cavity is formed in particular when substantially no intermediate walls are formed in the cavity, which possibly partially interrupt the cavity. This supports a material-saving production. In addition, a further weight reduction of the produced
  • the fluid is introduced with a pulsating pressurization.
  • the formation of a wall with a particularly low wall thickness is supported.
  • the fluid is conducted via a line system to different sections of the inner region of the intermediate product. It is thus allowing the fluid in the mold cavity Allow specific flow through one or more lines. This allows in particular the production of articles with a more complicated contour design, such as wall thickness thickening.
  • the pressurized fluid is introduced into the tool cavity at different times via the line system.
  • the method is suitably used in conjunction with thermoplastic materials.
  • the fluid is introduced correspondingly to a timing control with respect to the completion of the formation of the intermediate product.
  • the introduction of the fluid is begun at the earliest at the completion of the formation of the intermediate product.
  • a cooling fluid is introduced before the removal of the article from the mold cavity in the cavity for cooling. This reduces the cycle time during production.
  • the cooling fluid both water and cold gases can be used. But other liquids can be used. As gases, for example, CO 2 or nitrogen are used.
  • the temperature of the introduced cooling fluid is adjusted according to a desired cooling process, in particular taking into account the specific conditions of the plastic material used. Description of preferred embodiments of the invention
  • a preferably foamable melt of a plastic material for example a thermoplastic
  • a plastic material for example a thermoplastic
  • the propellant causes an independent spreading within the cavity of the tool, namely by means of at least partial foaming of the melt, so that foam structures are formed.
  • a non-foamable plastic melt is introduced.
  • An intermediate product made of plastic which has wall sections and an inner region at least partially surrounded by the wall sections, is formed in the tool cavity, wherein the inner region is formed as an intermediate product cavity or as a region with internal foamed structures or as a combination thereof, depending on the configuration of the process.
  • the article To form the article with a cavity, it is provided to introduce steam, preferably steam, into the interior in a time-delayed manner.
  • steam preferably steam
  • ordered at a steam temperature that is below the melting point of the plastic mass used to avoid excessive cooling of the melt, which is then formed into the intermediate product, and to achieve a uniform wall thickness in the article.
  • the structure of foamed wall sections in the wall of the article within the wall thickness can be influenced.
  • the water vapor can also be introduced pulsating.
  • the steam can also be guided to the respective thick places by separate line systems and can be introduced by varying the time at different times during the filling of the mold cavity.
  • the addition of CO 2 or nitrogen is carried out, and particularly preferably the use of water, which is mixed with a carrier material, for example cockroaches and introduced into a plastic or in a Kunststoffschrnelze.
  • a carrier material for example cockroaches and introduced into a plastic or in a Kunststoffschrnelze.
  • the addition of the water can also be effected by a superabsorbent polymer material, which also comes into consideration as a water carrier. Also, blends of both substrates are possible.
  • a cycle time reduction is achieved in the production, if after the introduction of the steam, the flow of water or cold gases through the cavity then formed, resulting in an internal cooling of the article.
  • Plastic are adjusted. Internal cooling is not only possible with water; All liquids or gases can be used which lead to intensive internal cooling, for example CO 2 or nitrogen.

Landscapes

  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

L'invention concerne un procédé de fabrication d'un article en matériau plastique pourvu d'un espace creux, procédé selon lequel des défauts de surface apparaissant à la surface de l'article au cours de la fabrication sont mieux évités. Selon l'invention, un demi-produit, présentant des sections de paroi et une zone intérieure, au moins partiellement entourée par les sections de paroi, ainsi que des structures expansées, est formé dans une cavité d'outil de moulage correspondant à l'article, après l'introduction d'un matériau plastique fondu expansible contenant un agent moussant, par expansion au moins partielle du matériau plastique fondu expansible contenu dans la cavité de l'outil. Lors d'un traitement ultérieur du demi-produit, un espace creux au moins partiellement entouré par une paroi est produit par introduction d'un fluide sous pression dans la zone intérieure puis, après le traitement ultérieur du demi-produit qui comprend également un processus de refroidissement, l'article pourvu de l'espace creux est démoulé de la cavité de l'outil.
PCT/DE2007/001233 2006-07-28 2007-07-12 Procédé de fabrication d'un article en matériau plastique pourvu d'un espace creux Ceased WO2008011862A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AT0933607A AT508511B1 (de) 2006-07-28 2007-07-12 Verfahren zum herstellen eines artikels mit einem hohlraum aus einem kunststoffmaterial
EP07801140A EP2046552A1 (fr) 2006-07-28 2007-07-12 Procédé de fabrication d'un article en matériau plastique pourvu d'un espace creux

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006034953.9 2006-07-28
DE102006034953A DE102006034953A1 (de) 2006-03-31 2006-07-28 Verfahren zum Herstellen eines Artikels mit einem Hohlraum aus einem Kunststoffmaterial

Publications (1)

Publication Number Publication Date
WO2008011862A1 true WO2008011862A1 (fr) 2008-01-31

Family

ID=38556396

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2007/001233 Ceased WO2008011862A1 (fr) 2006-07-28 2007-07-12 Procédé de fabrication d'un article en matériau plastique pourvu d'un espace creux

Country Status (3)

Country Link
EP (1) EP2046552A1 (fr)
AT (1) AT508511B1 (fr)
WO (1) WO2008011862A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4129635A (en) * 1973-12-28 1978-12-12 Asahi-Dow Limited Method for producing foamed moldings from synthetic resin materials
EP0445592A2 (fr) * 1990-03-03 1991-09-11 Ht Troplast Ag Procédé pour la fabrication d'un corps-creux en matiÀ¨re cellulaire
DE10018905A1 (de) * 2000-04-15 2001-10-18 Oberland Engineering Gmbh Verfahren zum Herstellen eines Kunststoffteils
DE10114418A1 (de) * 2001-03-23 2002-10-10 Battenfeld Gmbh Verfahren zum Spritzgießen von mindestens einen Hohlraum aufweisenden Formteilen aus wärmehärtendem Kunststoff

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4129635A (en) * 1973-12-28 1978-12-12 Asahi-Dow Limited Method for producing foamed moldings from synthetic resin materials
EP0445592A2 (fr) * 1990-03-03 1991-09-11 Ht Troplast Ag Procédé pour la fabrication d'un corps-creux en matiÀ¨re cellulaire
DE10018905A1 (de) * 2000-04-15 2001-10-18 Oberland Engineering Gmbh Verfahren zum Herstellen eines Kunststoffteils
DE10114418A1 (de) * 2001-03-23 2002-10-10 Battenfeld Gmbh Verfahren zum Spritzgießen von mindestens einen Hohlraum aufweisenden Formteilen aus wärmehärtendem Kunststoff

Also Published As

Publication number Publication date
AT508511A5 (de) 2011-02-15
EP2046552A1 (fr) 2009-04-15
AT508511B1 (de) 2011-03-15

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