CN1788974A - Method for producing a thermoplastic resin foamed article - Google Patents
Method for producing a thermoplastic resin foamed article Download PDFInfo
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- CN1788974A CN1788974A CN 200510095969 CN200510095969A CN1788974A CN 1788974 A CN1788974 A CN 1788974A CN 200510095969 CN200510095969 CN 200510095969 CN 200510095969 A CN200510095969 A CN 200510095969A CN 1788974 A CN1788974 A CN 1788974A
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Abstract
Disclosed are methods for producing thermoplastic resin foamed articles having a high expansion ratio and a large thickness by vacuum forming using a pair of molds through which vacuum sucking can be conducted and holding means for holding a thermoplastic resin foamed sheet at a predetermined position between the molds or a molding apparatus comprising a first mold having a molding surface through which vacuum sucking can be conducted, a second mold having a molding surface provided with sheet fixing means on at least the peripheral portion of the molding surface, and holding means for holding a thermoplastic resin foamed sheet at a predetermined position between the molds. In the methods, a heated and softened foamed sheet is supplied between the molds and vacuum sucking is started when the molds have been closed appropriately. Thus, the foamed sheet is vacuum formed to afford a molded article.
Description
Technical field
The present invention relates to a kind of vacuum forming and produce the method for expanded product of thermoplastic resin.
Background technology
Expanded product of thermoplastic resin is excellent on lightweight performance, recycling property, heat-insulating property etc., therefore, is used in the various application, for example auto parts material, building or structural material and packaging material.
In using, these use in many situations of expanded product of thermoplastic resin, at first produce the foaming of thermoplastic resin sheet material, then by secondary forming for example vacuum forming method this sheet material is configured as the shape that needs, this foam sheet is processed into expanded product of thermoplastic resin.With regard to the vacuum forming method of foaming of thermoplastic resin sheet material, for example Japanese Patent Application Publication discloses a kind of method of producing expanded product of thermoplastic resin for 54-148863 number, when close die, with foaming of thermoplastic resin sheet material supply between the male and female mould of a pair of qualification predetermined space, close die and when making mould closed, foam sheet is configured as spatial form by the mould vacuum draw.
Preferably foam sheet has high expansion ratio and big thickness.According to said method, can obtain having than the sheet material that is used for higher expansion ratio of vacuum-formed untreated foam sheet and bigger thickness.But, use said method, the spatial volume that untreated foam sheet forms in the time of can only expanding into the mould closure.Therefore, the foaming of thermoplastic resin sheet material that obtains has the big thickness of about at the most twice of the foam sheet thickness that is untreated.The expansion ratio that this method obtains also is unsatisfied.
In order to produce the foaming of thermoplastic resin sheet material that has than more gratifying high expansion ratio of the foam sheet that is untreated accordingly and gratifying big thickness, this method must be used the mould with large space.When using such mould, even when carrying out vacuum draw, completely untreated foam sheet can not be filled in this space sometimes, is difficult to produce the foaming of thermoplastic resin sheet material that has than bigger expansion ratio of the foam sheet that is untreated and bigger thickness.
Summary of the invention
The invention provides the method for producing expanded product of thermoplastic resin with high expansion ratio and big thickness.
First aspect, the invention provides a kind of method of using the former vacuum forming to produce expanded product of thermoplastic resin, described former comprises a pair of mould and the foaming of thermoplastic resin sheet material is clamped in the clamping device in precalculated position between the mould, each mould in the described a pair of mould all has can be through its mo(u)lding surface (molding surface) that carries out vacuum draw, and described method comprises step:
(1) the heating thermoplastic resin foamed sheet makes it softening;
(2) step (1) is softening foaming of thermoplastic resin sheet material supply is between mould;
(3) with the softening foaming of thermoplastic resin sheet material of the clamping device clamping between the mould time, close die, the space between the peripheral part of the mo(u)lding surface of mould arrives the predetermined value that is not more than softening foaming of thermoplastic resin sheet material;
(4) thickness that arrives softening foaming of thermoplastic resin sheet material in the space between the peripheral part at the mo(u)lding surface of mould arrives the time point time period the predetermined value defined in the step (3) to described space, and the mo(u)lding surface by mould begins vacuum draw;
(5) when continuing vacuum draw, open mould, have than softening foaming of thermoplastic resin sheet material bigger predetermined thickness when step (3) begins up to the foaming of thermoplastic resin sheet material, thereby this sheet material that is shaped is with the production mechanograph; With
The combination of (6) stop vacuum draw, opening mould and removing mechanograph.
Second aspect, the invention provides a kind of method of using the former vacuum forming to produce expanded product of thermoplastic resin, described former comprises first mould, second mould and the foaming of thermoplastic resin sheet material is clamped in the clamping device in the precalculated position between the mould, described first mould has the mo(u)lding surface that can carry out vacuum draw through it, described second mould has the mo(u)lding surface that is equipped with the sheet material clamping device at least at the peripheral part of mo(u)lding surface, and described method comprises step:
(1) the heating thermoplastic resin foamed sheet makes it softening;
(2) with foaming of thermoplastic resin sheet material supply softening in the step (1) between first and second mould;
(3) when the foaming of thermoplastic resin sheet material that softens with the clamping device clamping between the mould, close die, space between the peripheral part of the mo(u)lding surface of mould arrives the predetermined value that is not more than softening foaming of thermoplastic resin sheet material, thereby makes the surface of entire area contact foam sheet of the mo(u)lding surface of second mould;
(4) in step (3) after the described surface of the entire area of the mo(u)lding surface of second mould contact foam sheet, the mo(u)lding surface by first mould begins vacuum draw;
(5) when continuing vacuum draw and with the sheet material clamping device sheet material is fixed on the mo(u)lding surface of second mould, open mould, have than softening foaming of thermoplastic resin sheet material bigger predetermined thickness when step (3) begins up to the foaming of thermoplastic resin sheet material, thereby be shaped this sheet production mechanograph; With
The combination of (6) stop vacuum draw, opening mould and removing mechanograph.
Method of the present invention can provide the expanded product of thermoplastic resin with high expansion ratio and big thickness.
Description of drawings
In the accompanying drawings:
Fig. 1 is the figure of an example of the expression equipment of producing the foaming of thermoplastic resin sheet material;
Fig. 2 is the figure of an example of the expression shape of cross section of producing the employed round mould of foaming of thermoplastic resin sheet material;
Fig. 3 is the schematic diagram of a scheme of expression vacuum forming foaming of thermoplastic resin sheet material method of the present invention;
Fig. 4 is the schematic diagram of another scheme of expression vacuum forming foaming of thermoplastic resin sheet material method of the present invention;
Fig. 5 is the schematic diagram of another scheme of expression vacuum forming foaming of thermoplastic resin sheet material method of the present invention;
Fig. 6 is the schematic diagram of another scheme of expression vacuum forming foaming of thermoplastic resin sheet material method of the present invention;
Fig. 7 is the schematic diagram of the conventional method of expression vacuum forming foaming of thermoplastic resin sheet material; With
Fig. 8 is the schematic diagram of a scheme of the method for expression vacuum forming foaming of thermoplastic resin sheet material of the present invention.
Symbol in the accompanying drawing has the following meaning: 1: the equipment of producing the foaming of thermoplastic resin sheet material; 2: the twin (double) screw extruder of Φ 50mm; 3: the single-screw extrusion machine of Φ 32mm; 4: the circle mould; 5: the pump of supplying carbon dioxide gas; 6: axle; 7: the head of the twin (double) screw extruder of Φ 50mm; 8: the head of the single-screw extrusion machine of Φ 32mm; 9a, 9b, 10a, 10b, 10c, 10d, 11a, 11b: passage; 12: the outlet of circle mould; 13: the foaming of thermoplastic resin sheet material; 14: clamp; 15: infrared heater; 16,17,19,20,22,23: mould; 18: airtight holder; 21: airtight holder; 24: first mould that can carry out vacuum draw by it; 25: second mould with sheet material clamping device; With 26: the sheet material clamping device.
The specific embodiment
At first explain the scheme of first aspect of the present invention.Describe typical scenario in detail below with reference to Fig. 3, but the present invention is not limited to this scheme.
In the present invention, use the former comprise a pair of relative mould, each mould all has a mo(u)lding surface that can carry out vacuum draw through it.The example of relative mould comprises a pair of monogamous mould, a pair of two female moulds and two paired flat-die tools.
Have through its example of mould that can carry out the mo(u)lding surface of vacuum draw and comprise the mould that each all has mo(u)lding surface, at least a portion of described mo(u)lding surface is made up of sintered alloy, with, each all has the mould of mo(u)lding surface, and the part that limits at it is equipped with the hole of one or more discharge air at least.Number, position and the diameter in the hole that mould is equipped with do not limit especially, and be just passable as long as the foaming of thermoplastic resin sheet material of supply between mould can be configured as the shape of mo(u)lding surface of mould.
There is no particular limitation to the material of mould, but consider that from the angle of shape stability, durability and thermal conductivity they are made of metal usually.Consider that from the angle of cost and weight mould is preferably made of aluminum.The structure of preferred mold makes can control its temperature with heater or heat medium.For the lubricity of improving foam sheet or prevent that foam sheet from cooling off before shaping is finished, the mo(u)lding surface of mould is preferably regulated in 30～80 ℃ scope, more preferably 50～60 ℃.The description that should note this section also is applicable to the scheme of second aspect of the present invention of describing later.
Preferably at least one mould is the mould with airtight holding function.Use such mould when vacuum draw, to keep vacuum in the die cavity easily, can produce and shrink low-down mechanograph.An example with mould of airtight holding function is such mould, and wherein, the peripheral part of its mo(u)lding surface can be shifted to the mould on opposite.Thereby end face and mo(u)lding surface that the structure of preferred mold makes moveable part can collapse in the mould moveable part when mould is closed are in par.Because moveable part projection when so the structure of mould makes and to open mould, so keep vacuum in the die cavity in the mould opening steps of using such mould to narrate in the back easily.The description that should be noted that this section also is applicable to the scheme of second aspect of the present invention of describing later.
Another example with mould of airtight fixed function is the mould that has cushioning material on the peripheral part of mo(u)lding surface, as shown in Figure 4.Foam sheet has small inhomogeneities on their surface usually.When use has the mould of cushioning material, because cushioning material closely contacts the fine out-of-flatness surface of foam sheet all the time in the mould closing course, so when carrying out vacuum draw, keep the vacuum in the die cavity easily.Cushioning material can be rubber, foamed material etc.
Also can use a pair of mould for example shown in Figure 5, when close die, a mould covers with the airtight holder that is configured on another mold periphery.
Mould can have the fixedly device of foam sheet on mo(u)lding surface and/or mo(u)lding surface peripheral part.The example of such device comprises adhesive, latch, hook, clamp and slit (slit).The mould that use has a device of so fixedly foam sheet is configured as foam sheet the shape of mo(u)lding surface easily.
About former, preferably use such former, when finishing, the mould closure between the mo(u)lding surface of two moulds, limits a die cavity, and it highly is 0.8～2 times of foam sheet thickness softening in the step (1).The height of the die cavity of indication is meant in supply in the distance between the mo(u)lding surface on the thickness direction of the foam sheet between the mould here.Die cavity need all not have identical height in all places of die cavity.Die cavity can have the shape corresponding to required mechanograph shape.If the height of the die cavity that is limited when the mould closure is finished is too little, when mould is closed, born of the same parents chamber (cell) fragmentation in the foam sheet.If too big, as hereinafter described,, also be difficult to the mo(u)lding surface of the surface contact mould by making foam sheet and the shaping foam sheet even carry out vacuum draw.Even make foam sheet contact mo(u)lding surface, the also easy broken born of the same parents of foam sheet chamber.The description that should be noted that this section also is applicable to the scheme of second aspect of the present invention of describing later.
Fig. 3-(1) expression heating thermoplastic resin foamed sheet is so that its softening step (1).In step (1), foam sheet generally is clamped in the clamp, with the heating of firing equipments such as for example far infra-red heater, near infrared ray heater and contact-type heating plate.Because far infra-red heater can be at short notice foamable sheet material efficiently, so preferably use far infra-red heater.When the resin of forming foam sheet was the crystal resin, preferably the foamable sheet material made the fusing point of the surface temperature of foam sheet near this resin, perhaps, when this resin is noncrystal resin, makes its glass transformation temperature near this resin.The description that should be noted that this section also is applicable to the corresponding step (shown in Fig. 8-(1)) of the scheme of second aspect of the present invention of describing later.
Softening foaming of thermoplastic resin sheet material is supplied the state between a pair of mould in Fig. 3-(2) the expression steps (1), and each mould all has the mo(u)lding surface that can carry out vacuum draw.
When Fig. 3-(3) were illustrated in the foaming of thermoplastic resin sheet material that softens with the clamping device clamping between the mould, close die arrived the step till the predetermined value that is not more than softening foaming of thermoplastic resin sheet material up to the slit between each peripheral part of the mo(u)lding surface of mould.Carry out the mould closure and make that the relative mo(u)lding surface of mould is relatively approaching mutually.For example, fix a mould, another shifts to fixing this.Alternatively, move two moulds, make mould approaching mutually with opposite direction.
The state of vacuum draw is carried out in Fig. 3-(4) expression by the mo(u)lding surface of mould.Can be at the random time point beginning vacuum draw during the thickness that arrives softening foaming of thermoplastic resin sheet material from the slit between the peripheral part at mo(u)lding surface arrives the predetermined value that is not more than described foam sheet up to described slit.For example, during the thickness of the foaming of thermoplastic resin sheet material that equals to soften when the slit between the peripheral part of mo(u)lding surface, can begin vacuum draw, when continuing vacuum draw, mould is further closed less than the predetermined thickness than foam sheet thickness.Alternatively, also can the slit become be not more than softening foaming of thermoplastic resin sheet thickness in or afterwards, the beginning vacuum draw.When after foam sheet has predetermined thickness, carrying out vacuum draw, be preferably in before the foam sheet cooling usually and foam sheet has in 3 seconds behind the predetermined thickness and begins vacuum draw.
In order to obtain having the mechanograph of even inner structure, preferably begin vacuum draw, simultaneously by another mould vacuum draw by a mould.But, unless foam sheet be cooled, otherwise can be between two vacuum draves begin life period poor.When the vacuum draw that begins after beginning vacuum draw by another mould by a mould, the time difference between two beginning vacuum draves is preferably in 3 seconds.
The vacuum draw degree does not limit especially, but preferably suction makes the vacuum in the die cavity become-0.1MPa from-0.05MPa.Vacuum is with respect to atmospheric pressure in the die cavity.That is, " vacuum is-0.05MPa " is meant that the pressure in the die cavity is lower than atmospheric pressure 0.05MPa.Vacuum is high more, and foam sheet is drawn onto on the mould more consumingly.Therefore, foam sheet can be configured as shape near the die cavity shape.The vacuum of die cavity is the value of measuring at the opening (being configured on the die cavity) that carries out the hole of vacuum draw through it.The description that should be noted that this section also is applicable to the scheme of second aspect of the present invention of describing later.
Fig. 3-(5) expressions is opened mould and is arrived predetermined value greater than the thickness of softening foam sheet when the closed step of mould begins up to the thickness of foaming of thermoplastic resin sheet material, thereby sheet material is shaped, and forms mechanograph.When continuing vacuum draw, carry out opening of mould.Vacuum when the opening speed of adjusting mould and mould are opened makes foam sheet can successfully be configured as the shape of required mechanograph.
When opening wide mould, cool off foam sheet fully with predetermined slit.Stop vacuum draw then, further open mould.At last, remove the mechanograph that obtains.The state that the mould (not shown) is removed mechanograph is opened in Fig. 3-(6) expression.
The scheme of explained later second aspect of the present invention.Describe typical scenario in detail below with reference to Fig. 8, but the present invention is not limited to this scheme.
As shown in Figure 8, use have can through its carry out vacuum draw mo(u)lding surface first mould (4) and have second mould (5) of mo(u)lding surface, be equipped with sheet material clamping device (6) on the peripheral part at least of the mo(u)lding surface of second mould, moulding is with infrared heater (3) heating and softening foaming of thermoplastic resin sheet material (1).In this operation, foam sheet (1) is fixing with clamping device clip (2).Constructing second mould makes and can carry out vacuum draw through its mo(u)lding surface.The example that is used for the mould of this method comprises a male one to one female mould, two female moulds and paired flat plate mold.If any paired mould just can be used in the surface of the entire area contact foam sheet of the mo(u)lding surface of second mould when the slit of close die between the peripheral part of the mo(u)lding surface of mould arrives the predetermined value that is not more than foam sheet thickness.
Have and to comprise mould through its example of mould that carries out the mo(u)lding surface of vacuum draw with mo(u)lding surface, wherein to the alloy composition of small part mo(u)lding surface by sintering, with mould, at least in the one or more holes of its qualifying part configuration through its discharge air with mo(u)lding surface.If the foaming of thermoplastic resin sheet material of supply between mould can be shaped as the shape of the mo(u)lding surface of mould, number, position and the diameter in the described hole (one or more) that mould is equipped with do not limit especially.
Another example with mould of airtight fixed function is the mould that has cushioning material on the peripheral part of mo(u)lding surface.Foam sheet has small concavo-convex usually on its surface.When use has the mould of cushioning material,, when carrying out vacuum draw, keep the vacuum in the die cavity easily because cushioning material closely contacts the tiny convex-concave surface of foam sheet all the time when mould is closed.Cushioning material can be rubber, expanded material etc.
Also can use a pair of such mould, wherein when close die, a mould covers with the airtight holder on the periphery that is configured in another mould.
Shown in Fig. 8-(2), second mould has sheet material clamping device (6) at least on its peripheral part of mo(u)lding surface.The sheet material fixture also can be configured on a part of mo(u)lding surface.The sheet material fixture can be following any device: when the mo(u)lding surface through first mould continues vacuum draw, foam sheet can be fixed on the mo(u)lding surface of second mould when opening mould in the step of Miao Shuing (5) in the back.The example of such device comprises adhesive, latch, hook, clip and slit.Use has so fixedly foam sheet can easily be configured as foam sheet mo(u)lding surface with the mould of device shape.First mould also can and have the sheet material fixture on its peripheral part of mo(u)lding surface if desired on other parts.
Fig. 8-(1) expression heating thermoplastic resin foamed sheet is so that its softening step (1).Because the step of the preceding method of the details of this step and first aspect of the present invention (1) is identical, ignore the description of this step here.
In Fig. 8-(2) the expressions steps (1) softening foaming of thermoplastic resin sheet material supply have can through its carry out vacuum draw mo(u)lding surface first mould and have state between second mould of the mo(u)lding surface that is equipped with the sheet material fixture on the peripheral part at least at mo(u)lding surface.
The state that Fig. 8-(3) expressions is such: at softening foaming of thermoplastic resin sheet material with the clamping device between the mould fixedly the time, the slit of close die between each peripheral part of the mo(u)lding surface of mould arrives the predetermined value that is not more than softening foaming of thermoplastic resin sheet material, therefore a surface of the whole area contact foam sheet of the mo(u)lding surface of second mould.When the slit arrival of close die between the peripheral part of the mo(u)lding surface of mould is not more than the predetermined value of foam sheet thickness, with the sheet material clamping device on the peripheral part of the mo(u)lding surface that is configured in second mould foam sheet is fixed on the peripheral part of mo(u)lding surface of second mould, the whole area of the mo(u)lding surface of second mould finally contacts a surface of foam sheet.Therefore, foam sheet is configured as the shape of the mo(u)lding surface of second mould.Carry out the mould closure and make that the opposite mo(u)lding surface of mould is relatively approaching mutually.For example, fix a mould, another mould is shifted to fixing this.Alternatively, moving two moulds in the opposite direction makes mould approaching mutually.
The state of vacuum draw is carried out in Fig. 8-(4) expression by the mo(u)lding surface of first mould.After the whole area of the mo(u)lding surface of second mould begins to contact a surface of foam sheet, the beginning vacuum draw.Here " after the whole area of the mo(u)lding surface of second mould begins to contact a surface of foam sheet " of indication comprises " when the whole surface of the mo(u)lding surface of second mould begins to contact a surface of foam sheet ".When after the whole surface at the mo(u)lding surface of second mould begins to contact a surface of foam sheet, beginning vacuum draw, be preferably in before the foam sheet cooling and the whole surface of the mo(u)lding surface of second mould begins to contact in 3 seconds behind the surface of foam sheet and begins vacuum draw.
When use has can be during as second mould through its mould of mo(u)lding surface that carries out vacuum draw, can begin vacuum draw in step (1) to any time of step (4) by second mould.In typical case, when mould closure when the slit between two moulds is equal to or less than the thickness of foam sheet in step (3), the beginning vacuum draw.Also carry out vacuum draw, can in the short period of time foam sheet be configured as the shape of the mo(u)lding surface of second mould by second mould.
Fig. 8-(5) expression is opened mould and is reached than the thickness big predetermined value of softening foam sheet when step (3) begins up to the thickness of foaming of thermoplastic resin sheet material, thereby sheet material is shaped and forms mechanograph.When continuing vacuum draw, carry out opening of mould.Vacuum when adjusting mould opening speed and mould are opened makes foam sheet keep in touch the mo(u)lding surface of mould, and foam sheet finally is configured as the shape of required mechanograph.
When staying open mould, cool off foam sheet fully with predetermined slit.Stop vacuum draw then, further open mould.Remove the mechanograph that obtains at last.Fig. 8-(6) the opened mould (not shown) of expression is to remove the state of mechanograph.
Should be appreciated that following explanation is applicable to the scheme of first aspect of the present invention and the scheme of second aspect of the present invention.
In the present invention,, skin material can be placed on the mo(u)lding surface of or each mould before between the mould in foam sheet supply that will be softening.If can foam sheet be configured as the shape of mo(u)lding surface,, do not limit especially for the material and the thickness of skin material by the skin material vacuum draw.The raw-material example of skin material comprises the natural fiber of rubber, for example hemp, tossa of resin, for example thermoplastic elastomer of for example thermoplastic resin and thermosetting resin etc. etc. etc., the mineral matter of for example calcium silicates.The example of the form of skin material comprises film, sheet material, non-textile fabric and textile fabric.Except above-mentioned material, also can use thin plate or paillon foil by the metal of the synthetic paper of making based on the resin of the resin of propylene or styrene-based and for example aluminium and iron etc.Skin material can be by one deck two-layer or more multi-layered the composition.Skin material can be equipped with decoration, for example the rough pattern of textured pattern, stamp and dyeing etc.
The foaming of thermoplastic resin sheet material that the present invention uses does not limit especially.Can use known foam sheet.
The example of the resin of composition foaming of thermoplastic resin sheet material comprises the resin based on alkene, for example, the alkene homopolymer with 6 following carbon atoms of ethene, propylene, butylene, amylene and hexene etc. for example, copolymerization be selected from the resin, acrylic resin of olefin copolymer that two or more monomers in the alkene with 2～10 carbon atoms produce, ethylene-vinyl ester copolymer, ethene-(methyl) acrylic copolymer, ethene-(methyl) acrylate copolymer, ester resin, amide resin, styrene-based, based on the resin and the ionomer resin of acrylonitrile.These resins can use individually or use with two or more the form of mixtures of resin.In these resins, consider the preferred resin that uses based on alkene from the angle of formability, oil resistivity and cost.Consider the preferred especially resin that uses based on propylene from the rigidity and the hear resistance angle of the mechanograph that obtains.
When using by the foam sheet made based on the resin of propylene, the example based on the resin of propylene of forming foaming layer comprises Noblen and contains the copolymer based on propylene of the propylene units of at least 50 moles of %.Described copolymer can be block copolymer, random copolymer and graft copolymer.The example based on the copolymer of propylene that be fit to use comprises propylene and ethene or has the copolymer of the alpha-olefin of 4～10 carbon atoms.Example with alpha-olefin of 4～10 carbon atoms comprises 1-butylene, 4-methylpentene-1,1-hexene and 1-octene.The content of the monomeric unit in based on the copolymer of propylene except that propylene preferably is up to 15 moles of % for ethene, preferably is up to 30 moles of % for the alpha-olefin with 4～10 carbon atoms.Can use the resin of unitary class based on propylene.Alternatively, also can use the resin of two or more in combination based on propylene.
When use with 50 weight % of the thermoplastic resin that forms foaming layer or higher amount long chain branching based on the resin of propylene or have 1 * 10
5Or higher weight average molecular weight based on the resin of propylene the time, can produce the resin foamed sheet that contains than Cytology Lab based on propylene.In these resins, because in the recycling process of sheet material, form less gel, so preferably use noncrosslinking resin based on propylene based on propylene.
The resin based on propylene of long chain branching used herein is meant that branch index [A] satisfies the resin based on propylene of 0.20≤[A]≤0.98.The example based on the resin of propylene that branch index [A] satisfies the long chain branching of 0.20≤[A]≤0.98 is the propylene PF-814 that Basell produces.
Branch index quantizes long chain branching degree in the polymer, with following formula definition.
Branch index [A]=[η]
Br/ [η]
Lin
In formula, [η]
BrIt is the intrinsic viscosity based on the resin of propylene of long chain branching.[η]
LinThe intrinsic viscosity of that form by the monomeric unit identical, that have the weight average molecular weight identical, linear resin based on propylene with the resin based on propylene of long chain branching with the resin based on propylene of long chain branching.
The intrinsic viscosity that is also referred to as inherent viscosity is that polymer improves measuring of its solution viscosity ability.Intrinsic viscosity depends on the degree of branching of molecular weight and polymer molecule especially.Therefore, can use ratio the measuring of the intrinsic viscosity of the intrinsic viscosity of long-chain branched polymer and the linear polymer that molecular weight equals long-chain branched polymer as the long-chain branched polymer degree of branching.Intrinsic viscosity based on the resin of propylene can determine with the method for knowing usually, and for example Elliott etc. is at journal of applied (J.Appl.Polym.Sci.), 14, and the method for describing among the 2947-2963 (1970).For example, will in tetrahydronaphthalene or o-dichlorohenzene, measure intrinsic viscosity down based on the resin dissolves of propylene at 135 ℃.
Can determine weight average molecular weight (Mw) with normally used the whole bag of tricks based on the resin of propylene.Preferred especially use be M.L.McConnel etc. at U.S. laboratory (AmericanLaboratory), reported method, i.e. low angle laser light scattering strength detection method among the May, 63-75 (1978).
Have 1 * 10 by polymerization production
5Or an example based on the method for the resin of propylene of the HMW of higher weight average molecular weight is wherein as 11-228629 number described high molecular weight component of at first producing of Japanese Patent Application Publication, the method for producing lower-molecular-weight component then.
In the resin based on the resin of propylene and HMW of long chain branching based on propylene, preferably have 5 or bigger single shaft fusion elongation viscosity compare η
5/ η
0.1The resin based on propylene, more preferably 10 or bigger, described single shaft fusion elongation viscosity is than being to measure under following condition under the high about 30 ℃ temperature of fusion point than resin.Single shaft fusion elongation viscosity compares η
5/ η
0.1Be to use single shaft elongation viscosity analyzer (for example single shaft elongation viscosity analyzer of Rheometrix production) at 1 second
-1The extension strain rate under the value measured, wherein η
0.1Expression begins to be out of shape back 0.1 second detected single shaft fusion elongation viscosity, η
5Expression begins to be out of shape back 5 seconds detected single shaft fusion elongation viscosities.Use has the resin based on propylene of such single shaft elongation viscosity performance can produce the foam sheet with how small born of the same parents chamber.
With regard to the blowing agent that the preparation foam sheet uses, can use CBA or physical blowing agent.And, can use two types blowing agent together.But the example of CBA comprises known heat-decomposing compound, but for example be decomposed to form the thermal decomposition of blowing agent (for example azodicarboamide, azodiisobutyronitrile, dinitroso five methine tetramines, unifor, P, P '-oxygen-two (benzene sulfonyl hydrazide)) of nitrogen; With thermal decomposition inorganic foaming agent but (for example sodium acid carbonate, ammonium carbonate and carbonic hydroammonium).The object lesson of physical blowing agent comprises propane, butane, water and carbon dioxide.In the blowing agent that on as an example, provides, make water and carbon dioxide suitably, this be because when foam sheet heat in vacuum forms by the less distortion of second time of foaming generation, and be inert substance under hot conditions and be inertia fire because of these reagent.Based on the kind of blowing agent and the resin of use, determine the use amount of blowing agent rightly, thereby obtain needed expansion ratio.But 100 parts by weight of thermoplastic resin are used the blowing agent of 0.5～20 weight portion usually.
The method of the production foaming of thermoplastic resin sheet material that uses among the present invention does not limit.But, preferably use extruding of flat-die (T mould) or circle mould.Preferred especially resin melt extrusion simultaneously with the foaming of circle mould, stretches extrudate and the method cooled off etc. then on axle.When extruding the production foam sheet, also can use the mould resin melt extrusion, cooling curing stretches then.Foam sheet can be single sheet or multi-layer sheet.But,, preferably have the foam sheet of the sandwich construction of non-foaming superficial layer in order to prevent the fragmentation of born of the same parents chamber when the sheet production.The resin of forming nonfoamed layer can be the resin that example provided as the resin that forms foaming layer.The resin of nonfoamed layer is the resin with the resin same type that forms foaming layer ideally.For example, when foaming layer when making based on the resin of propylene, preferably nonfoamed layer also is to be made by the resin based on propylene.
The foaming of thermoplastic resin sheet material that the present invention uses also can be the composite sheet that single or multiple lift foam sheet and the compacting of another kind of material layer are equipped with.Such composite sheet can roll lamination, hot gas lamination etc. with foam sheet and another kind of material lamination and produce with dried lamination, sandwich lamination, heat.
Can be selected from the front with the material of foam sheet lamination together is the same material that skin material proposed.When producing in the automobile part with method of the present invention, use thermoplastic resin or for example sheet material or the non-textile fabric of the natural fiber of woolen fabric, hemp and tossa etc. widely.When producing food containers, be extensive use of single or multiple lift choke film with layer that one deck made by Ethylene vinyl alcohol copolymer, CPP film etc.
The multi-layer thermoplastic resin foamed sheet can be the multilayer foamed sheet that foaming layer and nonfoamed layer are formed.It also can be the multilayer foamed sheet of the different foaming layers compositions of mutual lamination.The example of the multilayer foamed sheet of being made up of the different foaming layers of mutual lamination comprises having expansion ratio X
αBe 2～20, thickness T
αBe 2～20mm, Substance R
αBe 600～3000g/m
2Foaming layer α and expansion ratio X
βBe 4～40, thickness T
βBe 2～12mm, Substance R
βBe 100～600g/m
2Those of foaming layer β, R wherein
α/ R
βBe 2～30.When forming such multi-layer thermoplastic resin foamed sheet, because foaming layer β expands manyly than foaming layer α, so can produce the mechanograph of rigidity and damping performance excellence with vacuum forming method vacuum of the present invention.
The foaming of thermoplastic resin sheet material that the present invention uses can contain additive.The example of additive comprises filler, antioxidant, light stabilizer, ultra-violet absorber, plasticizer, antistatic agent, colouring agent, releasing agent, fluidizing reagent and lubricant.The object lesson of filler comprises for example inorfil and for example inorganic particle of mica, clay, silica, titanium oxide, calcium carbonate and magnesium sulfate etc. of glass fibre and carbon fiber etc.
Because the mechanograph of vacuum forming method production of the present invention has high expansion ratio, big thickness and in light weight and heat-insulating property is excellent, so they can be used as packaging material, for example food containers, the interior part of automobile, building or structural material and household electrical appliance.The example of part comprises architrave, ceiling and luggage case side plate in the automobile.The mechanograph that uses the present invention's production can be kept vehicle interior temperature for a long time as these parts after regulating temperature.When mechanograph is used as food containers, because they can be different shape and their excellences on heat-insulating property of for example cup, plate and bowl etc., so be preferably used as the container and the food containers that is used for the micro-wave oven boiling of the soup that is heated to high temperature.
Embodiment
The example of the scheme of first aspect of the present invention is described below.But the present invention is not limited to these
Embodiment.
Produce two kinds of three layers of foaming of thermoplastic resin sheet materials with following method, wherein nonfoamed layer is laminated to each side of foaming layer.
(forming the raw material of foaming layer)
In the polymer powder by the preparation of the method described in Japanese Patent Application Publication 11-228629 number of 100 weight portions based on propylene with following physical property, add the calcium stearate of 0.1 weight portion, phenolic antioxidant (trade name: the Irganox 1010 of 0.05 weight portion, by Ciba SpecialtyChemicals, Inc. produce) and the phenolic antioxidant (trade name: Sumilizer BHT of 0.2 weight portion, produce by Sumitomo Chemical Co), mix.At 230 ℃ of these mixtures of following melt kneading.Produce polymer beads (i) like this based on propylene.Measuring down the load of 2.16kgf and 230 ℃ according to JIS K6758, is 12g/10min based on the melt flow rate (MFR) of the polymer beads (i) of propylene.Polymer beads (i) based on propylene is used as the raw material that forms foaming layer.
Physical property based on the polymer of propylene:
The intrinsic viscosity of component (A) (that higher component of molecular weight in two kinds of components that contain in the polymer that obtains with Japanese Patent Application Publication 11-228629 disclosed method) ([η] A)=8dl/g based on propylene; The content (C2inA)=0% of ethylene-derived units in the component (A); The intrinsic viscosity of component (B) (that lower component of molecular weight in two kinds of components that contain in the polymer that obtains with Japanese Patent Application Publication 11-228629 disclosed method) ([η] B)=1.2dl/g based on propylene; The content (C2inB)=0% of ethylene-derived units in the component (B).Use uniaxial tension viscosity analyzer that Rheometrics Co. produces 180 ℃ temperature and 0.1 second
-1Extension strain speed under measure η
5=71000Pas and η
0.1=2400Pas.
(forming the raw material of nonfoamed layer)
With (ii) (homo-polypropylene FS2011DG2 of polypropylene, produce by Sumitomo Chemical Co, (230 ℃ of MFR2.5g/10min, 2.16kgf)), polypropylene is the (homo-polypropylene of long chain branching (iii), title PF814, produce by Basell, (230 ℃ of MFR 3g/10min, 2.16kgf)), polypropylene is (propylene one ethylene atactic copolymer W151 (iv), produce by Sumitomo Chemical Co, ethylene derivative construction unit content is 4.5 weight %, (230 ℃ of MFR 8g/10min, 2.16kgf)), talcum masterbatch (masterbatch) is (v) (based on the talcum masterbatch MF110 of block polypropylene, produce by Sumitomo Chemical Co, talc content is 70 weight %) and titanium masterbatch (vi) (titanium masterbatch PPM2924, produce by Tokyo Printing Ink Mfg.Co.Ltd., Ti content: 60 weight %, (230 ℃ of the MFR:30g/10min of random polypropylene base, 2.16kgf)), with (ii)/(iii)/(iv)/(v)/(do to mix weight ratio vi)=12/30/15/43/5, produces the raw material that is used to form nonfoamed layer.
(production foam sheet)
Use the raw material of above-mentioned formation foaming layer and nonfoamed layer, use the equipment (1) shown in Fig. 1 and 2 to carry out extrusion molding, wherein the Φ 50mm twin (double) screw extruder (2) of extrusion foaming layer and the Φ 32mm single-screw extrusion machine (3) of extruding nonfoamed layer are connected on the round mould (4) of Φ 90mm.Produce the foaming of thermoplastic resin sheet material in the following manner.
The nucleator of 0.1 weight portion (changing into the MB1023 that Co., Ltd. produces by three associations) is mixed in the raw material that forms foaming layer of 100 weight portions and prepares raw material, this raw material is fed to the twin (double) screw extruder (2) of Φ 50mm through hopper, in being heated to 180 ℃ cylinder, mediates.
Melt kneading is to mixing and nucleator add the carbon dioxide of 0.5 weight portion as physical blowing agent from the pump (5) that is connected to the liquefied carbon dioxide hydraulic cylinder when thermal decomposition is foamed fully in raw material that forms foaming layer and the twin (double) screw extruder (2) of nucleator at Φ 50mm.Add after the carbon dioxide, further mediate this mixture the resin-like raw material is flooded by carbon dioxide.Then the mixture that obtains is supplied to round mould (4).
With forming raw material melt kneading in the single-screw extrusion machine (3) of Φ 32mm of nonfoamed layer, be supplied to round mould (4) then.
The raw material that forms foaming layer (7) by the twin (double) screw extruder of Φ 50mm are incorporated in the round mould (4), are transported to the outlet of round mould by passage (9a).On half road of passage (9a), raw material passes through path p bifurcated, and is transported to passage (9b).
The raw material that the head (8) of the single-screw extrusion machine by Φ 32mm will form nonfoamed layer is incorporated in the mould, is divided into passage (10a) and (10b) then.Behind the bifurcated, raw material is transported to the outlet of mould when supply, to be laminated to the both sides of passage (9a).On point (11a), realize lamination.Be fed to the raw material bifurcated of passage (10a) and formation nonfoamed layer (10b), the bifurcated path (not shown) by similar path p is transported to passage (10c) and (10d).Raw material transports the outlet to mould when transportation, the feasible both sides that are laminated to passage (9b).At point (11b), reach lamination.
Squeeze out at (11a) and (11b) form the molten resin of tubulose two class three-deckers from the outlet (12) of circle mould (4).Tubular resin is discharged into atmospheric pressure and makes contain in the raw material that forms foaming layer carbon dioxide expanded, forms the born of the same parents chamber.Form foaming layer like this.
When the axle that is drawn to maximum gauge 700mm (6) goes up the formation pipe, the three layers of foam sheet of two classes that stretch and extrude, cooling from mould.The tubulose foam sheet that obtains in the cutting of two places forms two dull and stereotyped sheet materials that 1080mm is wide along the longitudinal direction.On winding drum, roll every sheet material.Produce two expansion ratios and be 3 and thickness be the foaming of thermoplastic resin sheet material of 1.5mm.
Use vacuum forming machine (VAIM0301, Sato Iron Co., Ltd. produces) to carry out vacuum forming, as shown in Figure 3 by the foaming of thermoplastic resin sheet material that said method obtains.Mould (16), (17) all are the female moulds that epoxy resin is made.Each mould all has the mo(u)lding surface of being made up of the side of the square bottom surface of 300mm * 300mm and four 300mm * 0.5mm.Each mould all has the wide die joint of 15mm at the outward flange of mo(u)lding surface.The vacuum holes of the interval 10cm that it is 1mm that each mould all has altogether 12 diameters in four angles of the bottom surface of mo(u)lding surface and four sides.When moulding with the adjustment to 60 of mould ℃.
Foam sheet (13) is fixed in the clamp (14), uses infrared heater (15) heating to make sheet surface reach 160 ℃ then.Like this, sheet material is softening.Softening sheet material has the thickness of 1.5mm.
In the time of in being fixed on clamp, with softening sheet material supply between mould (16) and (17).
Make mould (16) and (17) mutually near closed they, the slit between the die joint of mould becomes 1mm.When finishing the mould closure, begin the vacuum draw of vacuum for-0.09MPa by mould.
The beginning vacuum draw after 0.5 second, open each mould with the speed of 20mm/min.Be that distance between the basal surface of aspectant mo(u)lding surface is that the position of 5mm stops 5 seconds of mould at the die cavity height.
Stop vacuum draw then, open mould.At last, remove the mechanograph of production.The evaluation result of the mechanograph that obtains is illustrated in the table 1.
The similar vacuum forming machine that uses among identical foam sheet that uses among the use embodiment 1 and the embodiment 1 carries out vacuum forming as shown in Figure 4.The structure mould makes and forms airtight fixture (18) along the whole periphery of the die joint of the mould of embodiment 1 use.Each airtight fixture (18) all is the cushioning material that bipeltate is made, wide 10mm, thick 3mm.Under the surface pressing of 14Mpa when mould is closed, it has and is compressed to the thick performance of 0.2mm.When moulding with the adjustment to 60 of mould ℃.
Foam sheet (13) is fixed in the clamp (14), uses infrared heater (15) heating to make sheet surface reach 160 ℃ then.Like this, sheet material is softening.Softening sheet material has the thickness of 1.5mm.
In the time of in being fixed on clamp, with softening sheet material supply between mould (19) and (20).
Make mould (19) and (20) mutually near closed they, the slit between the die joint of mould becomes 1mm.When the mould closure was finished, the vacuum that begins by mould was the vacuum draw of-0.09MPa.
The beginning vacuum draw after 0.5 second, open each mould with the speed of 20mm/min.Be that distance between the basal surface of aspectant mo(u)lding surface is that the position of 5mm stops 5 seconds of mould at the die cavity height then.
Stop vacuum draw then, open mould.At last, remove the mechanograph of production.The evaluation result of the mechanograph that obtains is illustrated in the table 1.
Employed same materials of foam sheet and equipment are produced in use in embodiment 1, the amount of physical blowing agent carbon dioxide is changed into 1.3 weight portions, the production expansion ratio be 5 and thickness be the foam sheet of 1.5mm.This foam sheet uses vacuum forming machine (VAIM0301, Sato Iron Co., Ltd. produces) to carry out vacuum forming, as shown in Figure 5.A mould is the mould (17) that uses among the embodiment 1.Another mould is the mould (22) that the mould (16) that wherein uses among the embodiment 1 is equipped with airtight retained part (21).When moulding with the adjustment to 60 of mould ℃.
Foam sheet (13) is fixed in the clamp (14), uses infrared heater (15) heating to make sheet surface reach 160 ℃ then.Like this, sheet material is softening.Softening sheet material has the thickness of 1.5mm.
In the time of in being fixed on clamp, with softening sheet material supply between mould (22) and (17).
Make mould (22) and (17) mutually near closed they, the slit between the die joint of mould becomes 1mm.When the mould closure was finished, the vacuum that begins by mould was the vacuum draw of-0.09MPa.
The beginning vacuum draw after 0.5 second, open each mould with the speed of 20mm/min.Be that distance between the basal surface of aspectant mo(u)lding surface is that the position of 6mm stops 5 seconds of mould at the die cavity height then.
Stop vacuum draw then, open mould.At last, remove the mechanograph of production.The evaluation result of the mechanograph that obtains is illustrated in the table 1.
The similar vacuum forming machine that uses among identical foam sheet that uses among the use embodiment 3 and the embodiment 3 carries out vacuum forming as shown in Figure 6.A mould is the mould with airtight standing part (18) (20) that uses among the embodiment 2.Another mould is the mould (19) that wherein uses among the embodiment 2 is equipped with airtight retained part (21) along the periphery of mould (19) a mould (23).When moulding with the adjustment to 60 of mould ℃.
Foam sheet (13) is fixed in the clamp (14), uses infrared heater (15) heating to make sheet surface reach 160 ℃ then.Like this, sheet material is softening.Softening sheet material has the thickness of 1.5mm.
In the time of in being fixed on clamp, with softening sheet material supply between mould (20) and (23).
Make mould (20) and (23) mutually near closed they, the slit between the die joint of mould becomes 1mm.When finishing the mould closure, the vacuum that begins by mould is the vacuum draw of-0.09MPa.
The beginning vacuum draw after 0.5 second, open each mould with the speed of 20mm/min.Be that distance between the basal surface of aspectant mo(u)lding surface is that the position of 6mm stops 5 seconds of mould at the die cavity height then.
Stop vacuum draw then, open mould.At last, remove the mechanograph of production.The evaluation result of the mechanograph that obtains is illustrated in the table 1.
Comparative Examples 1
Use the identical foam sheet and the mould that use among the embodiment 1, carry out vacuum forming as shown in Figure 7.When moulding with the adjustment to 60 of mould ℃.
Foam sheet (13) is fixed in the clamp (14), uses infrared heater (15) heating to make sheet surface reach 160 ℃ then.Like this, sheet material is softening.Softening sheet material has the thickness of 1.5mm.
When being fixed on clamp, with softening sheet material supply between mould (16) and (17).
Make mould (16) and (17) mutually near closed they, the slit between the die joint of mould becomes 1mm.When the mould closure was finished, the vacuum that begins by mould was the vacuum draw of-0.09MPa.The vacuum draw state kept for 10 seconds.
Stop vacuum draw then, open mould.At last, remove the mechanograph of production.The evaluation result of the mechanograph that obtains is illustrated in the table 2.
Comparative Examples 2
The identical foam sheet that uses among the embodiment 1 carries out vacuum forming.Two moulds all are the female moulds that epoxy resin is made.Each mould all has the mo(u)lding surface of being made up of the side of the square bottom surface of 300mm * 300mm and four 300mm * 2mm.Each mould all has the wide die joint of 15mm at the outward flange of mo(u)lding surface.The vacuum holes of the interval 10cm that it is 1mm that each mould all has altogether 12 diameters in four angles of the bottom surface of mo(u)lding surface and four sides.When moulding with the adjustment to 60 of mould ℃.
Foam sheet (13) is fixed in the clamp (14), uses infrared heater (15) heating to make sheet surface reach 160 ℃ then.Like this, sheet material is softening.Softening sheet material has the thickness of 1.5mm.
In the time of in being fixed on clamp, with softening sheet material supply between mould.
Make mould mutually near closed they, the slit between the die joint of mould becomes 1mm.When the mould closure is finished, begin by mould, vacuum is the vacuum draw of-0.09Mpa.The vacuum draw state kept for 10 seconds.
Stop vacuum draw then, open mould.At last, remove the mechanograph of production.Shrink because the fragmentation of born of the same parents chamber produces,, therefore can not be configured as the shape of die surface so that the mechanograph that causes obtaining has from the teeth outwards is dark not concavo-convex.The evaluation result of the mechanograph that obtains is illustrated in the table 2.
Comparative Examples 3
Same way as with Comparative Examples 2 is carried out vacuum forming, the different identical foam sheets that is to use embodiment 3 to use.Shrink because the fragmentation of born of the same parents chamber produces,, therefore can not be configured as the shape of die surface so that the mechanograph that obtains has from the teeth outwards is dark concavo-convex.The evaluation result of the mechanograph that obtains is illustrated in the table 2.
(mensuration of expansion ratio)
Make the mid-proportion that changes formula densitometer (densimeter D-H100 does Co., Ltd. of institute by the smart mechanism of Japan and produces automatically) mensuration 20mm * 20mm size product sample of water.On the density basis of the raw material that forms product, calculate expansion ratio.
(evaluation of thermal conductivity factor)
The pyroconductivity determinator (AUTO-A series HC-074) that uses Eko Instruments Trading to produce is measured thermal conductivity according to JIS A-1412.Based on this mensuration, calculation of thermal conductivity.Condition determination is as follows: the low temperature plate temperature: 20 ℃, and high temperature plate temperature: 30 ℃.Thermal conductivity factor is more little, and heat-insulating property is good more.
Table 1
| | | | | |
| The thickness (mm) of sheet material is untreated | 1.5 | 1.5 | 1.5 | 1.5 |
| The expansion ratio of sheet material is untreated | 3 | 3 | 5 | 5 |
| The thickness of mechanograph (mm) | 4.5 | 5 | 5 | 6 |
| The expansion ratio of mechanograph | 9 | 10 | 17 | 20 |
| Mechanograph apparent | Good | Good | Good | Good |
| Thermal conductivity factor (W/m 2/K) | 12 | 11 | 10 | 8 |
Table 2
| Comparative Examples 1 | Comparative Examples 2 | Comparative Examples 3 | |
| The thickness (mm) of sheet material is untreated | 1.5 | 1.5 | 1.5 |
| The expansion ratio of sheet material is untreated | 3 | 3 | 5 |
| The thickness of mechanograph (mm) | 2 | 2～4 *1 | 2～4 *1 |
| The expansion ratio of | 4 | 4～8 *1 | 7～13 *1 |
| Mechanograph apparent | Good | Difference | Difference |
| Thermal conductivity factor (W/m 2/K) | 28 | 25 | 22 |
*1: about thickness and expansion ratio, the mechanograph of Comparative Examples 2,3 is big with change in location.
Claims (2)
1. method by using the former vacuum forming to produce expanded product of thermoplastic resin, described former comprises a pair of mould and is used for the foaming of thermoplastic resin sheet material is clamped in the clamping device in precalculated position between the mould, each mould all has the mo(u)lding surface that can carry out vacuum draw through it, and described method comprises step:
(1) the heating thermoplastic resin foamed sheet makes it softening;
(2) foaming of thermoplastic resin sheet material softening in the step (1) is supplied between mould;
(3) with the described softening foaming of thermoplastic resin sheet material of the clamping device clamping between the mould time, close die, the space between the peripheral part of the mo(u)lding surface of mould reaches the predetermined value that is not more than described softening foaming of thermoplastic resin sheet material;
(4) time point in during following, mo(u)lding surface via mould begins vacuum draw: from, space between the described peripheral part of the mo(u)lding surface of mould reaches the thickness of described softening foaming of thermoplastic resin sheet material, arrive, described space reaches the described predetermined value defined in the step (3);
(5) when continuing vacuum draw, open mould, begin to have than the described softening big predetermined thickness of foaming of thermoplastic resin sheet material when step (3) begins, thereby this sheet material that is shaped is to produce mechanograph up to described foaming of thermoplastic resin sheet material; With
The combination of (6) stop vacuum draw, opening mould and removing mechanograph.
2. one kind is passed through to use the former vacuum forming to produce the method for expanded product of thermoplastic resin, described former comprises first mould, second mould and is used for the foaming of thermoplastic resin sheet material is fixed on the clamping device in precalculated position between the mould, described first mould has the mo(u)lding surface that can carry out vacuum draw through it, second mould has mo(u)lding surface and be equipped with the sheet material fixture at least on the peripheral part of this mo(u)lding surface, and described method comprises step:
(1) the heating thermoplastic resin foamed sheet makes it softening;
(2) with foaming of thermoplastic resin sheet material supply softening in the step (1) between first and second mould;
(3) when the foaming of thermoplastic resin sheet material that softens with the clamping device clamping between the mould, close die, space between the peripheral part of the mo(u)lding surface of mould arrives the predetermined value that is not more than described softening foaming of thermoplastic resin sheet material, thereby makes the surface of entire area contact foam sheet of the described mo(u)lding surface of second mould;
(4) the described entire area of the described mo(u)lding surface of second mould touches after the described surface of foam sheet in step (3), begins vacuum draw via the mo(u)lding surface of first mould;
(5) when continuing vacuum draw and with described sheet material fixture sheet material being fixed on the mo(u)lding surface of second mould, open mould, begin to have the big predetermined thickness of thickness up to described foaming of thermoplastic resin sheet material, thereby this sheet material that is shaped is to produce mechanograph than described softening foaming of thermoplastic resin sheet material when step (3) begins; With
The combination of (6) stop vacuum draw, opening mould and removing mechanograph.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004251731A JP4539238B2 (en) | 2004-08-31 | 2004-08-31 | Vacuum forming method for thermoplastic resin foam sheet |
| JP2004251731 | 2004-08-31 | ||
| JP2004271232 | 2004-09-17 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1788974A true CN1788974A (en) | 2006-06-21 |
| CN100522545C CN100522545C (en) | 2009-08-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100959692A Expired - Fee Related CN100522545C (en) | 2004-08-31 | 2005-08-29 | Method for producing a thermoplastic resin foamed article |
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|---|---|
| JP (1) | JP4539238B2 (en) |
| CN (1) | CN100522545C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109397670A (en) * | 2018-11-26 | 2019-03-01 | 沈阳力登维汽车部件有限公司 | Vacuum equipment |
| CN109540620A (en) * | 2018-11-26 | 2019-03-29 | 镇江立达纤维工业有限责任公司 | A kind of preparation facilities and preparation method of sound-absorbing exemplar |
| US11780129B2 (en) | 2020-03-20 | 2023-10-10 | King Steel Machinery Co., Ltd. | Molding method for operating molding device |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5495437B2 (en) * | 2010-07-27 | 2014-05-21 | トヨタ紡織株式会社 | Multilayer foam substrate and method for producing the same |
| JP5495439B2 (en) * | 2010-07-28 | 2014-05-21 | トヨタ紡織株式会社 | Multilayer foam substrate and method for producing the same |
| JP5818208B2 (en) * | 2011-12-12 | 2015-11-18 | トヨタ紡織株式会社 | Method for producing multilayer foam substrate |
| WO2018062033A1 (en) * | 2016-09-30 | 2018-04-05 | キョーラク株式会社 | Method for manufacturing foam molded body |
| JP7060782B2 (en) | 2016-09-30 | 2022-04-27 | キョーラク株式会社 | Manufacturing method of foam molded product |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3145424B2 (en) * | 1991-04-12 | 2001-03-12 | 三井屋工業株式会社 | Foam molding method |
| JPH08229971A (en) * | 1995-02-23 | 1996-09-10 | Tamai Kasei Kk | Resin foam sheet and molding method thereof |
| JPH09254249A (en) * | 1996-03-21 | 1997-09-30 | Sumitomo Chem Co Ltd | Production of porous fiber reinforced thermoplastic resin molded object |
-
2004
- 2004-08-31 JP JP2004251731A patent/JP4539238B2/en active Active
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109397670A (en) * | 2018-11-26 | 2019-03-01 | 沈阳力登维汽车部件有限公司 | Vacuum equipment |
| CN109540620A (en) * | 2018-11-26 | 2019-03-29 | 镇江立达纤维工业有限责任公司 | A kind of preparation facilities and preparation method of sound-absorbing exemplar |
| US11780129B2 (en) | 2020-03-20 | 2023-10-10 | King Steel Machinery Co., Ltd. | Molding method for operating molding device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100522545C (en) | 2009-08-05 |
| JP4539238B2 (en) | 2010-09-08 |
| JP2006068919A (en) | 2006-03-16 |
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