Summary of the invention
Therefore, an object of the present invention is to provide a kind of improved moldable fibrous composite, it can be used for preparing the pressing of different-thickness and density.
Another object of the present invention provides a kind of improved moldable composite of being made up of the layer of amalgamation successively.
Another purpose of the present invention provides a kind of improved moldable fibrous composite of being made by the compatible material that can easily recycle.
A further object of the present invention provides a kind of non-woven fibre composite that mold pressing has the goods of high thickness weight ratio that can be used in.
Also purpose of the present invention provides a kind of improved fibrous composite, and when mold pressing under heating and pressurization, it becomes the shape of mould easily and can not rupture or tear.
Of the present inventionly advance a purpose and provide and a kind ofly can be used in articles thermoformed therefrom and do not need the improved moldable fibrous composite of injecting resin.
For realizing aforementioned and other purpose and the shortcoming that overcomes above-mentioned prior art, from specifically and in a broad aspect the invention provides a kind of moldable non-woven fibre composite and preparation method thereof.Non-woven fibre composite according to the present invention has at least two functional layers, and this is two-layer all to be to be made by the non-woven polymer chemical substance or the material of identical thermoformable.The suitable polymers material comprises polypropylene, polyvinyl chloride, polyvinyl acetate, polyamide, polyvinyl alcohol, polyethylene, polyurethane and polyester.In a preferred embodiment, this two-layer be to make by polyester.These composites can be used for usually but are not limited to prepare automotive headliners, lining of car body, main cabin goods, luggage, furniture, motion goods and filtration article.
Selected polymer chemistry material is to make two kinds of different cloth with difference and/or other physical property.At least a cloth is shapable cloth, and it is in heating and/or add the die forming of depressing by final, has the intensity and the hardness of higher degree.Another kind of cloth is a kind of transformable compression cloth (also being referred to as the cloth of variable thickness), and when mold pressing under heating and/or pressurization, it can have variable thickness and density.Require end article to have in the purposes of uniform thickness and density at some, also can use this variable compression cloth.The variable compression cloth of this kind is U.S. Patent number 5,532,050 theme, and it is hereby incorporated by.In another embodiment, another layer that constitutes surperficial layer of cloth can be applied to be used to improve by the outward appearance of the goods of described composite the outer surface of one deck.Functional layer becomes with surperficial layer of cloth capable assembling can be as the composite of the shapable finished product of preparation.Terminology used here " composite " comprises the pantostrat of any accumulation, no matter bonding whether the raising by chemistry and/or physics mode between these layers.The composite adjacent layer bonding can by bonding such as the spraying powder, use liquid dispersion/solution, pressing, flame laminating, between functional layer, use the technology intermediate adhesion cloth and the mechanical acupuncture to be enhanced, all these all are that the one skilled in the art knows.
In this notion, what also comprise is another embodiment, the blend that wherein has the selected fiber of predetermined melt temperature scope be included in the hardness that influences the bonding and final pressing between each layer of composite one deck or two-layer in.This mechanism of bonding generation is to be referred to as " thermoplastic bonded " and is to be described in United States Patent (USP) 5,456,976 more fully that 3, the 36-50 are capable on the hurdle, and its reference content is hereby incorporated by.Sheet material with composite is placed in the mould then, and heating and/or press molding to be obtaining the shape of die cavity, and forms the resultant articles shape thus.
Detailed description of the present invention
Now describe the present invention in detail with reference to specific embodiment and accompanying drawing.
According to the present invention, goods are to be made by each coiled material or the sheet material of variable compressive and the layer of cloth mold pressing that can be shaped respectively.As shown in Figure 2, the cloth that can be shaped (25 and 26) is to be folded down from deflector roll (being respectively 29 and 32), and variable compression cloth (28) is to be folded down from deflector roll (31), and optionally, surperficial layer of cloth is from deflector roll (30).These layer of cloths are from their deflector rolls separately are fed through the have top die device of (33) and bottom (34), as shown in Figure 2.
Car roof is by each layer of the variable compressive cloth and the cloth (they contain binder fiber) that can be shaped is suppressed film (shape of its die cavity is exactly the shape of inside roof lining) by one, because the coiled material of composite does not batch.In order to implement mold pressing, composite is to stand the high temperature of scheduled time length and cool off in mould then.Adhesive fiber in each layer is softening and/or fusion and mixing mutually under heat and/or pressure, and by the demoulding, binder fiber will cool off and harden and each layer is bonded together.
According to another embodiment, can be shaped and variable compressive layer of cloth and optionally surperficial layer of cloth before making goods, be to form a composite.
With reference to Fig. 1, it has shown each layer, and it comprises composite article of the present invention.For easy explanation, the thickness of each layer does not draw according to scale.
In Fig. 1, the composite article (1) that comprises variable compressive cloth is to be clipped in the be shaped layer of cloth (5) of have upper surface (6) and lower surface (7), and have between the be shaped layer of cloth (8) of upper surface (9) and lower surface (10), last adhesive layer (14) and following adhesive layer (11) are to be embedded in variable compressive layer of cloth (2) respectively and can be shaped between layer of cloth (5) and (8), so that the upper surface of variable compressive layer (2) is near the lower surface of adhesive layer (14), and the upper surface (15) of adhesive layer (14) is close to the lower surface (7) of layer of cloth (5) that can be shaped, and the lower surface (4) of the upper surface (12) of adhesive layer (11) next-door neighbour's variable compressive layer (2), and can the be shaped upper surface (9) of layer of cloth (8) of the lower surface (13) of adhesive layer (11) next-door neighbour has improved bonding between layer of cloth (5) and the variable compressive layer (2) of can being shaped thus.
Aforesaid embodiment can be applied to the upper surface (6) of layer of cloth (5) that can be shaped and modification with the lower surface (19) of surperficial layer of cloth (17) by utilizing adhesive layer (20), so that the upper surface (21) of the lower surface (19) of surperficial layer of cloth (17) next-door neighbour's adhesive layer (20), and the lower surface (22) of adhesive layer (20) is close to the upper surface (6) of layer of cloth (5) that can be shaped, and has improved the outward appearance of the outer surface of composite and pressing thereof thus.Automobile liner or lining of car body can be shaped by this composite is passed die arrangement then, and make this composite stand high temperature and/or high pressure, and its time is to be enough to make this composite to form the shape of described die cavity.
In order to be used for the present invention, found that the basic weight of the cloth that can be shaped or harden should be the 4-18 ounce per square yard.Preferred range is the 6-12 ounce per square yard.The best of breed of the economy of the controlled hardness performance of feel, mold pressing finished product and preparation finished product when these scopes obtain preparing.
In another embodiment of the invention, the sheet material of polyester variable compressive cloth is between two sheet materials that are mixed in to the be shaped polyester of needle punched felt shape, makes with composite product thus.Described needle punched felt is the Knowlton Nonwovens Inc's manufacturing by the New York Utica.Cohesive between the adjacent sheet is to improve by mechanical acupuncture.Then composite is rolled into the storage coiled material.Can be with one deck bunting, such as the loop bonding polyester or the Foss needle-punching polyester of HOF AHMV8 printing, be applied to one deck and can be shaped on the outer surface of mylar.
A kind of goods, for example body of a motor car liner or inside roof lining are in heating and/or add to depress in mould and form.Then pressing is cooled to environment temperature.Above-mentioned US5,298,319 teachings be used to prepare the basic mould pressing method and the equipment of the goods of the alleged type of the present invention, and draw at this and to be reference.
It should be understood that improving fusible distinct methods can use having between the different layer of cloths of same compound material.For example, surperficial layer of cloth and high bonding can the enforcement between the layer of cloth of can being shaped by the embedding between the adhesive layer, high bonding can enforcement by needle point method between layer of cloth and the variable thickness layer of cloth can be shaped simultaneously.
In addition, the composite that is suitable for mold pressing can be made from can be shaped cloth and one deck variable compressive cloth of one deck.The surface layer of cloth can be applied on the outer surface of can be shaped one of layer of cloth or variable compressive layer of cloth.Between the function layer of cloth bonding can by the mechanical device such as acupuncture and/or by bonding such as the spraying powder, use the liquid dispersion and/or the embedding of solution, flame laminating and/or adhesive layer and their adhesive bonding methods such as combination to be enhanced.
The following example has shown various structure embodiment of the present invention and how to have controlled the physical property of structure of the present invention by changing some technological parameter.In the following example, the first and second stiffening agent layers are to make by needle-punching method: at first with the blending on standard weaving mixing apparatus of selected fiber, subsequently described fiber is carded to nonwoven, its then with its overlapping lapping to make the multilayer felt of highly-flexible, subsequently this felt layers is carried out acupuncture with the puncture of about 1000 pins.
Embodiment
Wherein one deck variable compressive cloth is to be clipped in two-layer or two a kind of moldable composite structures that can be shaped between (stiffening agent) cloth are by making by following technology.
Three kinds of material layers are as follows:
The first stiffening agent layer 50%Fiber Inovation Technologies 3.5 dawn *
2 inches crystalline polyester bicomponent binder fibers
50%Kosa 15 dawn * 3 in2s 95 type polyester
Basic weight-6 ounce per square yard
Needle point method is weaved (stiffening agent cloth)
Fiber, the mixed yarn that the second stiffening agent layer is same as described above and weaving
Basic weight-9 ounce per square yard
Variable compressive layer 50%Fiber Innovation 3.5 dawn of Technologies
* 2 inches crystalline polyester bicomponent binder fibers
25%6.7 dtex polyester
25%17.0 dtex polyester
Basic weight-20 ounce per square yard
Thickness-20 millimeter
(variable compressive cloth) is weaved in longitudinal lap joint
Between each of these materials, there is not adhesive layer.Longitudinal lap joint product variable compressive cloth is to make on Strudo machine, and the manufacturer of this machine is:
I.N.T.,s.r.o
460?05?liberec,Karla?Capka?302/22
Czech Republic
In order to prepare described variable compressive layer, with described three polyester fibers (comprising an adhesive fiber) blending and be carded to nonwoven on the textile fabric blending equipment of standard.The cloth of combing is sent into longitudinal lap joint Strudo machine so that it is folding or pleating, thereby obtain the longitudinal folding product of given thickness.Should thick product by a baking oven with this product by heating at least about 150 ℃, its softening or bond vitrified agent fiber is so that they are thermally bonded on other fiber in the blend, makes a softness, thick three-dimensional objects thus.
In order to make above-mentioned pressing, described technology comprises, described cloth is laminated into a composite, this composite is preheated to about 400 °F reaches about 8 minutes, this composite is put into to mould, closing molding becomes 16 millimeters slit to reach about 4 minutes, and die sinking with take out pressing, for warm mould sample, this mould (warm instrument) is to be preheated to about 300 °F.
The composite three-layer sample is: the variable compressive layer be clipped in longitudinally and the first and second stiffening agent layers that horizontal direction is made between.Other sample with same composition is to use without heated mold (cold instrument) at room temperature longitudinally to be made with horizontal direction.Four kinds of samples making according to said method are to use ASTM design D790-92, method of testing I-A three point load systems (center is on a simple crossbeam that supports), test according to the standard method of test with flexural property plastics that strengthen and electrically insulating material that be used for not strengthening.
Test result is to be listed in the table below in 1.
Table 1 deflection test result
Sample
*Describe
| Thickness (millimeter) | Compensation yield load (ox) | Yield load under 1 inch (newton) (%) | Slope (Newton/millimeter) |
Cold instrument SSL VCL FSL (vertically) | ??16.50 | ????20.9 | ????21.2 | ????101 | ????5.72 |
Warm instrument SSL VCL FSL (vertically) | ??17.50 | ????21.5 | ????22.5 | ????105 | ????5.65 |
Cold instrument SSL VCL FSL (laterally) | ??17.50 | ????24.5 | ????29 | ????118 | ????6.46 |
Warm instrument SSL VCL FSL (laterally) | ??17.75 | ????22.4 | ????28.5 | ????127 | ????5.90 |
*The SSL=second stiffening agent layer
VCL=variable compressive layer
The FSL=first stiffening agent layer
To molded composite material of the present invention provide the opereating specification of suitable stiffness be to the compensation yield load be about 13-26 newton.1 inch yield load of the present invention is about 90-140%, and slope hardness is the scope in about 2.5-7.0 Newton/millimeter.
Product of the present invention in a preferred embodiment, demanding stiffness is being suitable for automotive headliners, term " high stiffness " is by introducing and deflection result discussed above and definition in table 1.The demanding stiffness of mold pressing inside roof lining is with in order to support its weight in its span (it can be up to 8 feet in miniature circus caravan), additional weight with indoor lamp and sunglasses, and when assess by the standard environment tolerance test institute that is used for inside roof lining when exposing up to 3 days, can bending in-40 ℃ to 185 wide temperature range and rupture.Product must or be bent to breakdown point not by deflection, will break at this breakdown point inside roof lining, make it can not bear add the weight of roof liner component.And the destruction fracture in the inside roof lining will show by the ornamental layer of cloth in this inside roof lining, makes outward appearance attractive in appearance inadequately, should not be installed in the automobile.When stress surpassed its limit, product of the present invention was with bending and destroy fracture then, because above-mentioned reason makes it be not suitable for use in automotive headliners." low modulus " product can not destroy fracture, and does not show to bear and add the required stiffness of element weight in use, particularly in above-mentioned environment tolerance test.Therefore, the low modulus product was not to be suitable for automotive headliners originally.
Though described each embodiment of the present invention at this, these are only used for explaining and purpose of the present invention being described, and should not be construed as and limit the scope of the invention.To those skilled in the art will be that fairly obvious of the present invention various improvement are to be within the scope of the present invention, and be to be included in the appending claims.
Though with reference to preference pattern as shown in the drawing, show particularly and describe the present invention, but it will be understood by those skilled in the art that under situation about not departing within defined spiritual essence of the present invention of claims and the scope, can at length implement various changes.