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
  • B29C33/12—Moulds or cores; Details thereof or accessories therefor with incorporated means for positioning inserts, e.g. labels
  • B29C33/123—Moulds or cores; Details thereof or accessories therefor with incorporated means for positioning inserts, e.g. labels for centering the inserts
• • 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
  • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
  • B29C44/12—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
  • B29C44/1266—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements the preformed part being completely encapsulated, e.g. for packaging purposes or as reinforcement
• • 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
  • B29K2303/00—Use of resin-bonded materials as reinforcement
  • B29K2303/04—Inorganic materials
• • 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
  • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
  • B29K2995/0012—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular thermal properties
  • B29K2995/0016—Non-flammable or resistant to heat

Definitions

• the invention relates to a mold for producing a molded part with a core, in particular a foam molding with a core of mineral wool, and a foam of a foamed, optionally intumescent material which substantially completely surrounds the core, with two mold halves, which can be moved against each other and together define a cavity that images the molding.
• the invention further relates to a method for producing such a molded part and such a molded part.
• Moldings made of a foamed, intumescent material are used in the construction sector for the production of fire barriers.
• the foamed, intumescent material expands under the action of heat, for example in a fire, and can thus close openings tightly and prevent the spread of fire and / or smoke.
• foamed moldings are used, which do not contain fire protection additives.
• such moldings are often made with a core of another, more favorable material, for example mineral wool.
• This mineral wool core is usually overmoulded in a mold with a material which foams during manufacture.
• injection molding or reaction injection molding also RSG process
• the core often can not be foamed evenly with the material of the foam. If the core has a higher density than the liquid or unfoamed foam material, the core in the mold sinks to the bottom.
• the core in the mold floats on foam material and is pressed against the lid of the mold. In both cases, the core lies against the inside of the mold and can no longer be foamed evenly with the material for the foam coating.
• the object of the invention is to provide a mold for the production of such a molded part, which allows a uniform foaming of the core with an optionally intumescent material.
• the object of the invention is also to provide a method for producing such a molded article, which allows a uniform foam around the core and to provide a molded article produced by such a method or such a form.
• a mold for producing a molded part with a core, in particular mineral wool, and a substantially completely surrounding the core foaming of a foamed, material provided with two mold halves, which can be moved against each other and together define a cavity , which images the molding, wherein at least one spacer is provided on one of the mold halves, on which the core can be fixed and which predetermines the position of the core in the cavity.
• the spacer is used to fix the core in the desired position, so that it can be foamed in the mold with the material for the foam.
• the core is held spaced from all walls of the mold by the spacer so that the foam material can completely foam the core.
• the spacer may for example have at least a thorn-like extension which can be inserted into the core, as well as a stop against which the core can rest. Since the core is usually made of a light, porous material, the thorn-like extension can be easily inserted into this, whereby a secure fixing of the core position can be achieved. The core is pushed onto the extension until it touches the core, so that the position of the core is clearly defined.
• the spacer is arranged, for example, on the upper mold half, so that the core, if it drifts due to its low weight, is pressed against the stop.
• the spike-like extensions and the stop can be directed in this embodiment to the bottom of the mold, so that the core is pressed against the stop.
• injection openings for the material for the foam are provided on the lower mold half and / or the upper mold half, so that a uniform injection of the material is possible.
• a method for producing a molded part with a core, in particular made of mineral wool, and a foaming of a foamed material is further provided, wherein a mold according to the invention is used and the following steps are provided:
• the core Since the core is fixed by the spacer positionally fixed in the mold, it can be completely encapsulated by the material for the foam without this can float or sink due to the different density. Even a lateral displacement, if the material for the foam is not evenly filled in the mold, is certainly excluded.
• the material for the foam can be filled, for example before closing the mold in this and the core then, for example, when closing the mold, at least partially pressed into the material.
• the core displaces the material, which flows around the core and this almost completely encloses.
• the amount of material that is filled into the mold is so dimensioned that it completely fills the remaining space in the mold when the mold is closed.
• the material can also be filled into the mold after the mold has been closed, wherein injection openings can also be provided on the lid, so that a uniform encapsulation of the core is possible.
• the material for the foam can be, for example, a foam, in particular a polyurethane foam, which expands after filling into the mold and fills the cavities in the mold.
• the precursor components of the material may also be filled into the mold so that they react with each other in the mold to foam and thus fill the cavities in the mold. Since the material expands after injection into the mold or, as in the RSG process, the material formed in the mold, the mold does not have to be completely filled with the material or the precursor mixture at the beginning of the injection process.
• a molded part with a core in particular made of mineral wool or a similar material, and a foam of a foamed material, in particular an intumescent material is provided, which substantially completely surrounds the core, wherein holes are provided in the foam, the up to to the core. Through these holes, air can escape from the interior of the molded part when the molded part is installed, for example, into a component opening. As a result, the molded part can be more easily deformed or compressed and thus used more easily in a breakthrough or a cutout or adapted to it.
• the material of the foam has a density of 80 to 400 kg / m 3 and the mineral wool core has a density of 60 to 100 kg / m 3 .
• the material has intumescent properties, for which in the material an ash-forming and optionally intumescent substance mixture, which is distributed in the material, in particular homogeneously.
• the material for the foam coating preferably consists of a foamable binder which serves as a composite-forming carrier for the fire protection additives.
• the composite-forming carrier is preferably selected from the group consisting of polyurethanes, phenolic resins, polystyrenes, polyolefins such as polyethylene and / or polybutylene, melamine resins, melamine resin foams, synthetic or natural rubber, cellulose, elastomers, and mixtures thereof, with polyurethanes being preferred.
• the ash-forming and optionally intumescent mixture comprises the usual fire protection additives known to the person skilled in the art, which foam in the event of fire, ie under the action of heat and thereby form a foam which prevents flame propagation, such as an intumescent material based on an acid generator, a carbon-providing compound and a gas generator.
• fire protection additives known to the person skilled in the art, which foam in the event of fire, ie under the action of heat and thereby form a foam which prevents flame propagation, such as an intumescent material based on an acid generator, a carbon-providing compound and a gas generator.
• the intumescent material comprises as acid generator, a salt or an ester of an inorganic, non-volatile acid selected from sulfuric acid, phosphoric acid and boric acid, as the carbon-providing compound, a polyhydroxy compound and / or a thermoplastic or thermosetting polymeric resin binder and as a gas-forming agent a chlorinated paraffin, melamine, a Melamine compound, in particular melamine cyanurate, melamine phosphate, melamine polyphosphate, tris (hydroxyethyl) cyanurate, cyanamide, dicyanamide, dicyandiamide, biguanidine and / or a guanidine salt, in particular guanidine phosphate or guanidine sulfate.
• an inorganic, non-volatile acid selected from sulfuric acid, phosphoric acid and boric acid
• the carbon-providing compound a polyhydroxy compound and / or a thermoplastic or thermosetting polymeric resin binder and as a gas-forming
• foaming can also be achieved physically in the event of fire (physical intumescence).
• expanded graphite is generally used. This can be incorporated into the carrier material like (or in addition to) the additives mentioned above.
• expandable graphite for example, known intercalation compounds of SOx, NOx, halogen and / or strong acids are used Graphite in question. These are also referred to as graphite salts. Preference is given to expandable graphites which release S0 2 , S0 3 , NO and / or N0 2 at temperatures of, for example, 120 to 350 ° C. while being swelled.
• the expandable graphite may for example be in the form of platelets with a maximum diameter in the range of 0, 1 to 5 mm. Preferably, this diameter is in the range 0.5 to 3 mm.
• Expandable graphites suitable for the present invention are commercially available. In general, the expandable graphite particles are evenly distributed in the foam. However, the concentration of expandable graphite particles can also be varied selectively, pattern-like, areally and / or sandwich-like.
• the composite-forming carrier may further be used as an ablative additive, an inorganic compound containing water, e.g. as crystal water, has stored firmly and at temperatures up to 100 ° C does not dry out, but this releases in case of fire from 120 ° C and thereby cool temperature-bearing parts, preferably, at the fire temperature or flaming water-emitting inorganic hydroxide or hydrate, in particular Aluminum hydroxide, alumina hydrates or partially hydrated aluminum hydroxides.
• inorganic hydroxides or hydrates which emit water during the flame treatment are also suitable, as described in EP 0 274 068 A2.
• the production of the foam is carried out by foam molding, such as reaction injection molding, according to DE 3917518, eg with Fomox® fire protection foam or the insulating layer-forming building material HILTI CP 65GN.
• foam molding such as reaction injection molding, according to DE 3917518, eg with Fomox® fire protection foam or the insulating layer-forming building material HILTI CP 65GN.
• Materials which can be used for purposes of the invention are known from EP 0061024 A1, EP 0051 106 A1, EP 0043952 A1, EP 0158165 A1, EP 01 16846 A1 and US 3,396,129 A and EP 1347549 A1.
• the molded body consists of an intumescent polyurethane foam, as it is known from EP 0061024 A1, DE 3025309 A1, DE 3041731 A1, DE 3302416 A and DE 341 1 327 A1.
• Fig. 2 shows a mold according to the invention for the production of the molding of Figure 1 and
• FIG. 1 shows a molded part 10 which has a core 12 made of mineral wool, as well as a foam casing 14 made of an intumescent material.
• a foam casing 14 made of an intumescent material.
• the foam 14 expands under the action of heat, so that the molded part 10 can close openings in walls or ceilings tight and thus can prevent the passage of fire and / or smoke.
• the intumescent material is for example a PUR foam, which expands after filling in the mold and can close voids in the mold.
• This foam has a density of 80 to 400 kg / m 3 after curing.
• the core 12 usually has a much lower density of 60 to a maximum of 100 kg / m 3 .
• Such a molded part 10 could also be made entirely of intumescent material.
• the core 12 is made of a cheaper material, such as mineral wool, so that the manufacturing cost of such a molded part 10 can be reduced.
• FIG. 1 A mold 16 for producing such a molded part 10 is shown in FIG.
• the mold 16 has a first mold half 18, which defines the lid 20 of the mold 16 here, and a second mold half 22 with side walls 24 and a bottom 26.
• the first mold half 18 and the second mold half 22 can be moved against each other.
• the two mold halves 18, 22 define a cavity 28, which images the molded part 10 to be produced.
• two spacers 30 are provided, each having a pin-like extension 32 and a stop 34.
• the spike-like projection 32 and the stop 34 are here to the bottom 26 of the mold 16, that is directed vertically downwards.
• injectors 36 are provided, through which a liquid, intumescent material for the foam 14 can be injected into the mold 16.
• FIGS. 3a and 3b The method for producing the molded part 10 with the mold 16 is shown in FIGS. 3a and 3b.
• a first method step the core 12 is fixed in the open mold 16 on the spacer 30 by the core 12 is pushed onto the mandrel-like extensions 32 until the core 12 abuts against the stops 34 ( Figure 3a). Since the core is made of a porous material, the extensions can be easily inserted into the core.
• the intumescent material for the foam 14 is filled in the second mold half 22 and the mold 16 is closed by the first and the second mold half 18, 22 are moved against each other ( Figure 3b).
• the core 12 is pressed into the foam 14, wherein the foam 14 is displaced by the core 12.
• the amount of material of the intumescent material that would be filled into the mold is such that the intumescent material fills the space within the mold when the mold is closed, thus completely enclosing the core 12.
• the core 12 is fixed by the spacers 30 in the closed mold 16 so that it can be completely encapsulated by the intumescent material.
• the core 12 is held reliably by the spike-like extensions 32, so that it can not fall down. If the core 12 had a greater density than the intumescent material 14, the core would be held securely by the extensions 32, so that the core 12 can not sink to the bottom of the mold.
• the core 12 floats on the intumescent material and is urged against the stops 34 of the spacers 30 and thus spaced from the lid 20 held. With the exception of the contact surfaces on the stops 34 so the entire core 12 can be overmolded.
• the holes 38 formed by the spacers 30 and the stops 34 can be closed by additional material, for example, after removal of the molding 10 from the mold 16.
• the filling of the intumescent material 14 into the mold 16 can, as in the embodiment shown here, take place before the mold 16 is closed. But it is also conceivable that the mold 16 is first closed and then the intumescent material via injectors 36, which may also be provided in the lid 20 or on the side walls 24, is filled.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Fireproofing Substances (AREA)

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Cited By (1)

Citations (16)

• 2013
  • 2013-06-25 WO PCT/EP2013/063206 patent/WO2014005880A1/fr not_active Ceased

Patent Citations (25)

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