CN1241966A - Improved cloth-like, liquid-impervious, breathable composite barrier fabric - Google Patents
Improved cloth-like, liquid-impervious, breathable composite barrier fabric Download PDFInfo
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- CN1241966A CN1241966A CN 97181055 CN97181055A CN1241966A CN 1241966 A CN1241966 A CN 1241966A CN 97181055 CN97181055 CN 97181055 CN 97181055 A CN97181055 A CN 97181055A CN 1241966 A CN1241966 A CN 1241966A
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Abstract
The present invention is directed to cloth-like, liquid-impervious, breathable composite barrier fabrics. More particularly, the present invention is directed to cloth-like, liquid-impervious, breathable film-nonwoven composite fabrics, comprising at least one nonwoven layer and a microporous film, having biological liquid barrier capabilities for use as, for example, sterilization wrap, surgical draping, surgical gowns, cover garments, such as over-suits, and the like.
Description
Invention field
The present invention relates to the composite barrier fabric of cloth-like, liquid-impervious, breathable.Specifically, The present invention be directed to the film-non-woven compound fabric of such cloth-like, liquid-impervious, breathable, they have the ability that stops biofluid, can be used as the overcoat that for example sterilizes, surgery with curtain, surgery nightwear, dustcoat, as overcoat or the like.
Background of invention
Surgery nightwear, surgery, must average out on character, characteristics and performance characteristic in order to work satisfactorily with curtain, surgery face shield and sterilization overcoat and germ-resistant separate type pocket (always being called " surgery goods " later on).Even these class surgery goods mainly are to be designed to stop also can significantly reduce biofluid and/or airborne contaminant by they propagation.In the Surgery Treatment environment, this class I liquid I source comprises that for example blood, life are supported liquid such as blood plasma and saline for this kind nightwear wearer's sweat stain, patient's body fluid.The example of airborne contaminant includes but not limited to biological pollutant, as antibacterial, virus and mycotic spore.This pollutant also can comprise granular material, such as but not limited to the spittle of Soft flocks, breeze, dust, furfur and breathing.Barrier fabric can stop the tolerance of the ability that this class gas loading material passes through to be represented with filter efficiency sometimes.
These class surgery goods also should in use promptly make us comfort in wearing.The breathability of surgery goods, promptly its moisture permeability is its important tolerance of comfortableness in use.The surgery goods in use include but not limited to its ability of dangling, the sense of cloth shape, feel, creeping chill and dry sensation to influential other features of its comfortableness.
The surgery goods also need the intensity and the ruggedness of floor level, and the safety of necessary degree particularly is provided in surgical management in order to the user who gives goods.
At last, the surgery goods preferably can cheaply be produced, and utilize light material to improve the comfort of wearer in the use, can also reduce the expense of this goods.
The multilayer barrier fabric of using the liquid-impervious, breathable of all structures has been known.By the lyophobicity fabric, for example the surgery goods that form of the fabric that is formed by supatex fabric or layer provided qualified opaque liquid, ventilative property, drapability, intensity and the ruggedness of cloth shape and low cost already.But, still need clothing and dust-robe that the barrier material of improved cloth-like, liquid-impervious, breathable forms the surgery goods and is used for other, as individual protective equipment (for example working clothing), wherein, some or all of above-mentioned performance characteristic and characteristics is desired or necessary.The application of other individual protective equipments include but not limited to test chamber purposes, clean room purposes for example in quasiconductor is made, agricultural use, mining purposes, environmental application or the like.
In addition, goods next to the shin such as adult's incontinence product and baby or child's fitting diaper or clothing can be used the parts with above-mentioned desired character as training pant.
Summary of the invention
For this reason, one object of the present invention is to provide a kind of like this barrier material of improved cloth-like, liquid-impervious, breathable, and the superior balance of its realizability energy feature and characteristics is applicable to clothing, dust-robe and individual protective equipment, comprises as the surgery goods.
More particularly, first purpose of the present invention is to provide a kind of like this barrier material of improved cloth-like, liquid-impervious, breathable, it can stop effectively biofluid by and meet the measurement result that the ASTMES21 test method requires.
Another purpose of the present invention is to provide a kind of like this barrier material of the cloth-like, liquid-impervious, breathable that has improved, and it can wear seasonal wearer as snug as a bug in a rug.Barrier material of the present invention shows high-caliber breathability, and for example according to the measurement result of test method described here, water vapour permeability (WVTR) is at least per 24 hours 1000 grams of every square meter.But this barrier material of the present invention also shows the drapability of textile-like, according to test method measuring described here, and the rigidity of dangling＜4.0 centimetre.
Another purpose of the present invention is to provide a kind of like this barrier material of the cloth-like, liquid-impervious, breathable that has improved, it has proper strength and the ruggedness that is fit to its application target, the sample tension peak energy of grabbing that has in machine direction is at least about 15 in-lb power, the crosscut machine direction then at least about 19 in-lb power; And in the peak strain of machine direction at least about 35%, the crosscut machine direction at least about 70%.
Another purpose of the present invention is to provide a kind of like this barrier material of the cloth-like, liquid-impervious, breathable that has improved, and it is a light weight, and manufacturing expense is lower, and basic weight is less than about 2.0 oz/yd
2
Above-mentioned each purpose and other purposes can realize by improved cloth-like, liquid-impervious, breathable barrier material disclosed herein and that the proposition patent right requires.
Accompanying drawing is briefly described
Fig. 1 is the cross-sectional figure of barrier material of the present invention;
Fig. 2 generally shows the process that is used for making barrier material of the present invention.
The detailed description of invention
The present invention is directed to a kind of improved cloth-like, liquid-impervious, breathable barrier material, it has well balanced performance characteristic and characteristics, and it is applicable to makes the surgery goods, and the clothing and the dust-robe that are used as other, as be used for individual protective equipment.The embodiment of barrier material of the present invention is described with reference to the accompanying drawings.Barrier material 10 is laminate, and it comprises three layers: non-woven top layer 12 is for example formed by spun-bonded fibre; Non-woven bottom 16 is for example formed by spun-bonded fibre; Ventilative intermediate layer 14 is for example formed by microporous membrane.The known method of each layer of barrier material 10 comprises heat-mechanical adhesion, ultrasonic bonds, binding agent, stitching, or the like.Lamination, bonding or be attached to together.
Here " layer " used or " fabric " can have single-piece or many s' double meaning when it occurs separately.Here used " laminate " is meant what two or multiply cloth material bonding already or that be bonded with each other were formed.Here used " supatex fabric " or " non-woven fabric " are meant such fabric, and it has the folded structure of mutual folder that each fiber or long filament are got, but are different from the discernible and mutually multiple structure of knitting or weaven goods.
Commercially available thermo-plastic polymeric material can finely be used for making fiber or the long filament by its non-woven top layer 12 that forms and bottom 16.Here used " polymer " will include but not limited to homopolymer; Copolymer is block, grafting, random and alternate copolymer for example; Terpolymer, or the like, and their mixture and modifier.In addition, unless in addition restriction especially in addition, " polymer " will comprise all possible geometric configuration of this polymeric material, comprising but be not limited to isotactic, a rule, at random and random symmetrical configurations.Here used " thermoplastic polymer " or " thermo-plastic polymeric material " are meant that when heating is softening and can return solid-state long-chain polymer when being cooled to room temperature.Typical thermoplastic material includes but not limited to polrvinyl chloride, polyester, polyimides, polyfluohydrocarbon, polyolefin, polyurethane, polystyrene, polyvinyl alcohol, caprolactam and their copolymer.
The supatex fabric that can be used in non-woven layer 12 of the present invention and 16 can be made by multiple known manufacturing process, and that these methods comprise is spunbond, air lay, melt and spray or bonded carded fabric forming method.For example in illustrated embodiments of the invention, top layer 12 and bottom 16 all are spunbonded non-wovens, and they have proved and have helped forming barrier material 10.Spunbonded non-woven fabrics is to be made by the melt-spun silk.Here used " melt-spun silk " is meant the many tiny capillary tube that is generally circle by spinneret, small diameter fibers and/or long filament that melting heat moulding material extruding filamentation is formed, the diameter of the long filament that is squeezed into stretches with for example non-sucking type or sucking type fluid then or other known spunbond mechanisms make its quick tube reducing.At last, these melt-spun silks just deposit on the carrier band or similar device in the motion in random basically mode, form to be essentially continuously and the fabric of the melt-spun silk of random arrangement.Spunbond silk generally is inadherent when it deposits on the pinching surface.U.S. Patent No. 4340563 (Appel etc.), No.3692618 (Dorschner etc.), No.3802817 (Matsuki etc.), No.3338992 and No.3341394 (Kinney), No.3502538 (Peferson) and No.3542615 (Dobo etc.) have been described in the production of this spunbonded non-woven fabrics, and all these patents all are incorporated herein by reference.The melt-spun silk that is formed by spun-bond process generally is successive, and greater than 7 microns (microns), more special situation is between about 10-100 micron according to the average diameter of at least 5 measurement results.Another be commonly used to represent the diameter of fiber or silk be danier (denier) its be defined as the gram number of per 9000 meters fibers or silk.
It is stable or solidified (adherent in advance) under certain mode after producing that nonwoven fabric is right after it, so that this fabric has the harsh environment that sufficient globality and intensity stand further to be processed into finished product.This pre-adhesion step can be by heat activated adhesive coated to silk by what adopt liquid or powder type, or more generally finishes by hold-down roller.Here used " hold-down roller " be meant one group on the supatex fabric or under be used for compressing the roller of this fabric, with dealing with particularly a kind of mode of nonwoven fabric of the melt-spun silk just produced, so that make this fabric that the globality that is enough to further process be arranged, but the aid adhesion that adopts is later handled as, heat bonding bonding by air, ultrasonic bonds, or the like produce stronger bonding.Thereby compression roll is to push described fabric slightly to improve its globality so that strengthen its self adhesion.
Typical aid adhesion processing and utilizing knurling rolls device makes nonwoven fabric carry out heat bonding, and this roller arrangement generally comprises embossing bond roll and slick anvil roller, and they limit the bonding roll gap of heat embossing together.Perhaps, above-mentioned anvil roller also can be loaded with bond pattern on its outer surface.These knurling rolls are heated to suitable tack temperature by the heater of routine and drive by the driving device of routine and rotate, and make it can form during by this gap at nonwoven fabric the decorative pattern of a series of heat.Behind the material of given linear velocity, tack temperature and this fabric of formation, the nipper pressure in the roll gap should be enough to the bondability of realizing that fabric is required.For this nonwoven fabric, the percentage bond area is generally about 10%-about 20%.
Rete 14 can be formed by any microporous membrane in the middle of the breathable, and needing only this microporous membrane can be suitably bonding or be attached on top layer 12 and the bottom 16, and formation can be primely gets final product in conjunction with the barrier material 10 of performance characteristic described here and characteristics.A suitable class coating materials comprises at least two solvents: thermoplastic elastic polyolefin polymer and filler.These components (with other components) can be admixed together, and any one in the known all film production method of the personage in the applied film treatment process is heated and is squeezed into the single or multiple lift film then.This class filming technology comprises for example casts embossing, the casting of chill casting peace and film blowing method.
Generally, on the basis of dry weight, according to the gross weight of thin film, rete 14 will comprise polymer or its mixture of the thermoplastic polyolefin of about 60% weight ratio of about 30-, and the filler of about 70% weight ratio of about 40-.As long as additive and the batching that add other can for rete 14 are the ability that they can significantly not disturb this thin layer energy to work according to principle of the present invention.This class additive and batching for example comprise antioxidant, stabilizing agent and pigment.
Rete 14 also comprises filler except that polyolefin polymer.Here used " filler " comprises granulous and other forms of material, and they can add to and do not disturb the film that is squeezed in the described membrane polymer extruding mixture and on chemical property, can be distributed to equably in the whole film simultaneously.Generally, filler is got granular form, can spherical in shape or non-sphere, and particle mean size is at about 0.1 to about 7 microns.Organic and inorganic filler all is in the scope that allows in the present invention, as long as they do not disturb the film forming process maybe can make rete play effect of the presently claimed invention.The filler that is suitable for comprises calcium carbonate (CaCO
3), various clay, Silicon stone (SiO
2), aluminium oxide, brium carbonate, sodium carbonate, magnesium carbonate, Talcum, barium sulfate, magnesium sulfate, aluminum sulfate, titanium dioxide (TiO
2), zeolite, cellulose type powder, Kaolin, Muscovitum, carbon, calcium oxide, magnesium oxide, aluminium hydroxide, wood pulp powder, wood powder, cellulose derivative, chitin and chitin derivatives.When needing, can on filler particles, be coated with suitable coating, for example stearic acid.
As mentioned above, rete 14 can with the people who is familiar with film-forming process known any traditional method formation.Polyolefin polymer and filler mix by the scope that provides previously, heat then and push film forming.For the uniform breathability that water vapour permeability reflected as rete is provided, filler should evenly spread to whole polymeric blends, thereby is distributed within the whole rete itself.For the present invention, when calculating, when its water vapour permeability is at least 300 gram/rice with test method noted earlier
2(g/m in the time of/24 hours
2During/24hr), think that promptly this rete is " breathable ".In general, rete is in case after forming, its per unit area weight will be less than about 80 gram/rice
2(gsm), and behind the stretching attenuate, its weight per unit area then is the about 25gsm of about 10-.
Below the rete used in the described example of the present invention be monofilm, but the rete of other types belongs within the scope of the present invention too as multilayer film, as long as forming technique can be complementary with the film of institute filling.This rete is general thicker and extraordinary noise takes place when its initial formation, and its tendency when shake is sent " noise made in coughing or vomiting ".In addition, this film that just forms does not possess the breathability of enough degree of calculating by its water vapour permeability.For this reason, this rete is heated to equals or with about 5 ° of temperature that are lower than the polyolefin polymer fusing point, with the device of the machine direction of orthoscopic orientation (MDO) this coating materials is stretched at least 2 times (2x) of its original length then, with this rete of attenuate and make it become porous matter.This rete 14 further is stretched to about 3 times (3x) of its original length, 4 times (4x) or more multiple, and the original length of this rete obviously is the formed rete 14 of contact the present invention.
" effectively " thickness that should have behind the rete 14 drawn attenuates or thickness are about 0.6 mil of about 0.2-(mil).This effective thickness is used for hole in the ventilative rete or air-gap reference are entered.For the hermetically sealable film of common not filling, the actual (real) thickness of this film is identical with effective thickness.But for stretched-filled already film, as previously mentioned, will comprise air-gap in the thickness of thin film,, can calculate effective thickness according to the test method that outlines later for such volume that increases is ignored.
With reference to figure 2, wherein illustrated the process of continuous preparation barrier material 10 of the present invention.Rete 14 is to use the common film-forming apparatus 20 of optional type to form as casting film or blown film equipment.Make then rete 14 with described prescription by film stretcher 22 with its stretching with make this film be thinned to effective thickness 0.6 Mill (mil) or thinner.A kind of film stretcher that is suitable for is a kind of machine direction aligning device, and model 7200 can be available from Marshall﹠amp; Williams Company has business office at Providence, Rhode Island.
In the 14 tensile whiles of rete, spunbond nonwoven layers 12 and 16 have been formed.As mentioned above, the manufacture process of traditional spunbonded non-woven can be used to form non-woven layer 12 and 16.As shown in Figure 2, nonwoven fabric the 12, the 16th, by on the progressive forming net 24,26 that deposits to motion from extruder 28A, 28B, 29A, 29B, be basically continuously and the melt-spun silk of random arrangement form.This fabric of the melt-spun silk of random arrangement can be carried out bondingly in advance then, promptly allow each fabric 12,16, give fabric 12,16 with sufficient whole shape and intensity, for further processing by a pair of hold-down roller (not showing bright).One or two of this hold-down roller can heat, to assist the bonding of fabric 12,16.Usually, this has wounded in the battle outer surface to one of hold-down roller, the discrete bond pattern with regulation bond area can be passed to fabric 12 and/or fabric 16.The then normally slick anvil roller of another hold-down roller relative with it, but when needs, this roller also can have wounded in the battle outer surface.
When rete 14 had stretched after attenuate and orientation and nonwoven fabric 12,16 formed already already fully, these three layers are put together, and with a pair of lamination or bond roll 30,32 as shown in Figure 2, or with other traditional bonders, make their mutual laminations, produce barrier material 10 of the present invention.
As shown in Figure 2, bond roll 30 is knurling rolls, and second bond roll 32 is smooth roll.These two rollers are all with for example motor (not shown) driving of actuating device.Knurling rolls 30 are right cylinders, can with any suitable durable material for example steel form, to reduce roller abrasion in use.The outermost of knurling rolls 30 has the pattern of the bonding zone of protuberance.In present technique, the common situation, for example can suitably adopt discontinuous pattern discrete, that regularly repeating bounding point constitutes.Smooth or the smooth outer surface of the bonding zone on the knurling rolls 30 and the anvil roller that is oppositely arranged 32 forms a roll gap, and this anvil roller also is a right cylinder, can form by any suitable durable material, for example by steel, increase hard rubber, resin treatment cotton or polyurethane and form.
The pattern of bonding zone of protuberance is chosen on the knurling rolls 30, at least one surface that make resulting barrier material 10 for the shared area of binding agent after by the gap that forms between the roller 30,32, about 10%-about 30% of the surface area of barrier material for this reason.The bond area of barrier material 10 can change the percentage bond area that reaches above-mentioned, and this is known in the present technique.
The temperature of the outer surface of knurling rolls 30 can change by heating or cool off with respect to smooth roll 32.Heating and/or cooling can influence the lamination degree of each layer that for example forms barrier material 10.Can carry out the heating and/or the cooling of knurling rolls 30 and/or smooth roll 32 with conventional apparatus known in the present technique (not shown).Form the specific range of temperatures that adopts in the barrier material 10 and depend on many factors, they comprise type, the nipper pressure of each layer between the time of staying between roll gap and knurling rolls 30 and anvil roller 32 of the polymeric material in each layer that is used for forming barrier material 10.When coming out the roll gap that barrier material 10 forms between bond roll 30,32, material 10 can be wound up on the roller 34 for continue after processing.
In not breaking away from spirit of the present invention and scope, expert scholar can be immediately to all remodeling of above-mentioned proposition.For example, after barrier material 10 formed, it can continue to be for further processing on line or conversion.Perhaps, the attenuate rete 14 that can stretch with different equipment.It is bonding and be laminated on the non-woven layer 12,16 rete 14 to adopt other known devices, and the barrier material 10 that needs only gained has above-mentioned required character.At last, can put in distant and form rete 14 and/or non-woven layer 12,16, each layer that makes rolling delivered in the roll gap that forms between knurling rolls 30 and the smooth roll 32 under the unwinding from the spool then.In addition, in some applications, for example can advantageously save a kind of in these two kinds of nonwoven fabrics and form a kind of bicomponent material as previously discussed.Typical nonwoven fabric weight for this class purposes is about 1.5 oz/yd of about 0.6-
2(osy), and generally be about 0.9-1.3osy.This class material can be by heating or bonding to form composite on the thin film that is laminated to the stretching attenuate.
After having described some embodiment of the present invention, string sample barrier material is carried out test further illustrated the present invention, indicate for simultaneously expert scholar and implement mode of the present invention.The measurement result of some physical property of barrier material of such formation and used method of testing have been outlined below.As a comparison, several commercially available barrier materials have been measured identical physical property.Here the result who is reported makes to measure for 5 times the average result of income values with regard to various character for each sample and barrier material usefulness relatively.
Test method
The sample that has adopted following test method to analyze to point out below and the barrier material of usefulness relatively.
Effective thickness
The effective thickness of coating materials is to be removed the basic weight of coating materials and calculated by the density of film forming polymer of shape and filler.In order to obtain with the inch is the effective thickness of the coating materials of unit, and the weight per unit area of measuring that records by every square yard of ounce (osy) be multiply by 0.001334 (metric system is to the unit conversion coefficient of English system), with this result divided by gram per centimeter
3(g/cc) be the density of the polymer composition of unit.
Tensile strength and elongation test
Fracture load and the percentage percentage elongation before the fracture, i.e. " draftability " of material are measured in the grab test of tensile strength and elongation.These measurements increase continuously under the load in isodromicing elongation lower edge single direction at material to be carried out.The process of the test strictness is according to ASTM standard D-5035-92 and D-5035-92 and INDA IST110.1-92, adopt isodromicing elongation's testing machine such as the integrated pilot system of Sintech system 2 computers, by MTS Systm Corp.'s manufacturing in Minnesota state Eden Prairie city.
For each sample material, the accurate cutting knife cutting wide with 4 inches (100 millimeters) goes out 5 samples, and each wide 4 inches (100 millimeters) and long 6 inches (150 millimeters) make long dimensional directions be parallel to test and direction reinforcing.Sample places in the anchor clamps of isodromicing elongation's testing machine.Each sample is set for and is made its length or the long size action direction of parallel force as far as possible.Sample is applied successive load, and crosshead speed (loading speed) is set at 300 mm/min until sample fracture.Note peak load, peak energy and peak strain and meansigma methods.The measurement result of difference recorder direction (MD) and crosscut machine direction (CD).
Water vapour permeability
According to ASTM standard E96-80, calculate the water vapour permeability (WVTR) of sample material, from the round specimen of each test material and contrast material cutting-out 3 inch diameters, this contrast material is a slice CELGARD
2500 films are available from Hoechst CelaneseCorporation of Sommerville, New Jersey.CELGARD
2500 films are pore type polypropylene screens, and various materials have been prepared three samples.The test dish is a No.60-1 vaporimeter dish, available from Thwing-Albert Instrument Company of Philadelphia, Pennsylvania.The distilled water of 100 milliliters (me) is injected each vaporimeter dish, simultaneously each sample of sample material and contrast material is cross-placed on the open top of each dish, the fastening screwed flange that goes up, edge along each dish forms sealing (not adopting sealing cement), the test material or the contrast material that are associated are exposed to the circle that ambiance is assigned 6.5 cm diameters, about 33.17 centimetres of the exposed area that is had
2Above-mentioned dish is weighed, place the forced air draft oven of 37 ℃ of temperature then.This stove is a constant temperature oven, has extraneous air to cycle through wherein and is gathered in its inside with steam-preventing.The forced air draft oven that is suitable for for example is Blue M Power-O-Matic 60 stoves, available from Blue M Electric Co of Blue Island, Illinois.After 24 hours, will coil from stove and take out, weigh once more.This preliminary test water vapour permeability value is calculated as follows:
Test WVTR (gram/rice
2/ 24 hours)=(the grammes per square metre losses after 24 hours) * 315.5 gram/rice
2Relative humidity in/24 hours stoves is not done special control.
100 (32 ℃) and envionmental humidity pre-conditioned down, CELGARD
The WVTR of 2500 films has been determined as 5000 gram/rice
2/ 24 hours (g/m
2/ 24hr).Control sample has been carried out each test like this, uses following formula simultaneously and imposes a condition relatively and proofread and correct the preliminary test value:
WVTR (gram/rice
2/ 24 hours)=(test WVTR/ contrast WVTR) * 500 gram/rice
2/ 24 hours
Basic weight
The basic weight of sample material is measured according to federal test method(s) No.191A/5041.The sample size of sample material is 15.24 centimetres of 15.24 cm x, and it is average in addition then that each material has been tried to achieve 5 values.
Hydrostatic test
Hydrostatic test is measured under low hydrostatic pressure non-woven material to the osmotic resistance of water.Process of the test is according to the federal test method(s) standard of method 5514-No.191A, and AATCC test method(s) 127-89 and ZNDA test method(s) 80.4-92 are through changing to the window supporting member that includes standard synthetic fibers screen window material.
A kind of Textest FX-300 hydrostatic pressure head testing machine can be available from Schmid Corp, and it has business office at Spartanburg, and South Carolina fills its test head with pure water.This pure water remains under the temperature of 65-85 (18.3 ℃-29.4 ℃), this is to carry out this test in the scope of standard ambient condition (about 73 (23 ℃) and about 50% relative humidity), the test material of 8 inches * 8 inches (20.3 centimetres of 20.3 cm x) square samples is placed to the accumulator that covers this test head fully.This sample is in standard water to be depressed, and increases hydraulic pressure with constant speed, observes on the outer surface at sample material and sews.In three zones that separate mutually of sample, measure the hydrostatic pressure resistance when sewing sign in beginning to show.5 samples to each sample material repeat this test.The hydrostatic pressure resistance of each sample gained is averaged and notes this result with millibar.Higher value surface convection cell infiltration has bigger resistance.
The cup crushing test
The cup crushing test is according to isodromicing elongation's tensile testing machine, uses pliability peak load value that peak load and energy unit measure material when low, and material is just soft.
Process of the test is to carry out in controlled environment, about 73 of temperature wherein (23 ℃), relative humidity about 50%.Sample is to carry out with 2 computer integration test systems of aforesaid Sintech system, the crushing test platform then is available from Kimberly-Clark Corp QualityAssurance Department in Neenah, Wisconsin, this testing stand comprise steel ring, the substrate of support, the model 31 of model 11, the cup assembly and the calibrating installation of model 41.
Steel ring places on the shaping drum, the fixed shaping drum top that places of the sample of 9 inches * 9 inches (22.9 centimetres of 22.9 cm x) middlely.The cup that is shaped is slipped on the shaping drum, be clipped in fully between shaping drum and the steel ring around this steel ring until this sample ring.The cup that is shaped places the load chamber still also to sit the back that is placed on substrate securely in the top of substrate.The crosshead speed setting in 400 mm/min, is reduced support in the shaping cup with mechanical means, this sample of crushing, simultaneously by isodromicing elongation's tensile testing machine measure the required peak load of this sample of crushing (with gram) and energy (with gram. millimeter).Calculate its meansigma methods and be reported in this according to the peak load and the energy of each sample material 5 samples.
Stiffness test dangles
The stiffness test that dangles is used fabric and is measured the bending length of this fabric from the crooked principle of the cantilevered that hangs down at it.Resistance when this test method measuring dangles rigidity bending fabric.Bending length be used for estimating fabric weight and by fabric in the interaction of its fabric stiffness represented when hanging down bending between the two.It has reflected that fabric is under gravity in the rigidity of a plane inner bending.
Make the sample of 1 inch * 8 inches (20.32 centimetres of 2.54 cm x) be parallel to its long dimensional directions slip in the speed lower edge of 4.75 English/minute (12.07 centimeters/minute), make its leading edge outstanding from the edge of horizontal surface.When the top end of this sample connects this top end when the line at testing stand edge becomes 41.5 ° angle with horizontal plane pressing under the sample deadweight effect, measure the length of this extension.This extension is long more, and the fabric bending must be slow more, thereby higher numerical value shows that this fabric is firmer.
This process of the test is according to ASTM code test D1388, and just the size of sample is as described above.Carry out and write down the MD measurement result and the CD measurement result of bending length respectively, the cantilevered Apparatus for Bending at low-temp of employing for example is can be available from the 79-10 type of the company of testing a machine, and there is business office in the said firm at Amityville, New York.
The Rigidity Calculation of dangling is as follows:
Dangle rigidity (centimetre)=bending length (inch) * 2.54 records the meansigma methods of the rigidity of dangling at this.
Example
Sample 1
Prepared barrier material of the present invention.This rete includes according to the total restatement of the percentage of its weight: 13%Shell 6D82 polypropylene, polyethylene copolymer wherein contains 5.5% ethylene; 18% Rexene FD-D1700 low-crystallinity polypropylene, it has the random stereoisomer of heavy polymer chain; 3% Dow5004 has 60000ppm Irgafos168 as antioxidant and stabilizing agent; The blue concentrating agents of 2% SCC12673 can be available from Stondridge ColorCorp.; And 64% English China Supercoat calcium carbonate (CaCO
3), be coated with 1.5% De behenic acid, have 1 micron particle mean size and 7 little top cuts.This calcium carbonate is available from ECCA Calcium Products, Inc, and in Sylacauga, Alabama, it is the tame branch company of ECC International.Above-mentioned coating materials is through being blow molded into monofilm.
The spunbond layer of aforementioned end face and bottom surface all is 0.6 oz/yd
2Supatex fabric form by squeezable thermoplastic resin, this thermoplastic resin comprises: propylene and contain the 97%Shell 6D43 random copolymer of the vinyl monomer of 3% ethylene; 2% titanium dioxide (white); The blue concentrating agents of 0.09% antistatic compound and 0.91 SCC11111.This spunbond silk is successive in essence substantially, and average fiber size is 2.0dpf.
The non-woven layer of above-mentioned film and top and bottom arrives together with the heat bonding roll laminating as previously mentioned.The tack temperature of knurling rolls is about 145 of the temperature of about 185 smooth anvil rollers.The nipper pressure that forms between two rollers is about 440psig.
Comparative example 2
Test 3 commercially available Baxter Vira Block surgery dust-robes.
Comparative example 3
Test 3 commercially available 3M surgery dust-robes with Prevention fabric.
Comparative example 4
Test 3 commercially available Baxter Optima Standard surgical dust-robes.
Comparative example 5
Test 3 can be available from the Evolution3 Standard surgical dust-robe of Kimberly-Clark Corp.
Below the whole measurement results shown in two tables take from the main part of various surgery dust-robes.Shown whole numerical value are the meansigma methodss according to 5 measurement results.Table 1
Table 2
| Sample | Basic weight (osy) | MD peak load (lb) | Grab sample peak energy (in-lb) | The anti-peak strain (%) of opening | CD peak load (lb) | Grab sample peak energy (in-lb) | The anti-peak strain (%) of opening |
| ?1 | ?1.844 | ?23.015 | ?15.605 | ?39.306 | ?16.676 | ?19.073 | ?71.458 |
| ?2 | ?2.681 | ?28.451 | ?14?877 | ?34.748 | ?21.507 | ?18.216 | ?54.796 |
| ?3 | ?1.822 | ?29.929 | ?30.191 | ?57.490 | ?22.995 | ?29.697 | ?70.650 |
| ?4 | ?2.239 | ?27.332 | ?12.174 | ?28.230 | ?15.763 | ?17.164 | ?77.252 |
| ?5 | ?1.579 | ?19.648 | ?13.237 | ?37.172 | ?14.844 | ?12.486 | ?51.040 |
| Sample | Fluid pressure head (mbar) | ???????WVTR ????(g/m 2/24hr) | Cup energy (g/mm) | Broken load (g) | The rigidity of dangling (MD) (cm) | The rigidity of dangling (CD) (cm) |
| ????1 | ??250.00 | ????3019.45 | ?2940.12 | ?163.99 | ????3.580 | ????2.240 |
| ????2 | ??250.00 | ????1628.82 | ?4975.54 | ?284.27 | ????3.890 | ????3.020 |
| ????3 | ??250.00 | ????4308.00 | ?3829.26 | ?189.16 | ????2.190 | ????2.230 |
| ????4 | ??26.6 | ????4846.97 | ?5514.46 | ?317.65 | ????4.100 | ????2.180 |
| ????5 | ??54.6 | ????4861.78 | ?2954.77 | ?154.94 | ????3.370 | ????2.520 |
Data in table 1 and the table 2 clearly show, barrier material 10 of the present invention combines physical features and characteristics such as the drapability of low basic weight, good intensity and ruggedness, barrier properties, breathability and textile-like and flexibility primely.
Should know according to the present invention the barrier material of the cloth-like, liquid-impervious, breathable that constitute this improved, be to revise the performance requirement that adapts to various degree in the actual use for the expert regulates.Therefore, although toply described the present invention with reference to some special form of implementation and example already, need know that the present invention can have other all configurations.Therefore, the application is used for containing any variation of the present invention under its universal principle, purposes or remodeling, though be used for simultaneously comprising and depart from the disclosed content of the application, be the present invention relates to and belong to known or common process practice content in the appended claim book scope.
Claims (23)
1. the liquid-impervious, breathable barrier material of a cloth shape, it comprises:
At least one deck non-woven layer;
Be adhered to the microporous film layers of cambium layer casting die on the above-mentioned non-woven layer, this laminate is a breathable, and the WUTR of measurement is at least 300 grammeter/rice
2/ 24 hours and have about 2.0 oz/yd of basic weight
2Or it is lower, be at least 15 inches one pound along the machine direction peak energy, along the machine direction peak strain at least about 35%, at least about 19 inches one pound, at least about 70%, hydrostatic pressure head is about 250 millibars (mbar) or bigger along the machine direction peak strain along crosscut machine direction peak energy, cup crushing peak load is less than about 180 grams, the cup compression energy is less than about 3000 gram/millimeters, along the rigidity of dangling＜4.0 of machine direction centimetre, along the rigidity of dangling＜3.0 of crosscut machine direction centimetre.
2. the liquid-impervious, breathable barrier material of the described cloth shape of claim 1, wherein, it also comprises first and second non-woven layers.
3. the liquid-impervious, breathable barrier material of the described cloth shape of claim 1, wherein, described non-woven layer comprises nonwoven fabric.
4. the liquid-impervious, breathable barrier material of the described cloth shape of claim 2, wherein, described first and second non-woven layers comprise first and second nonwoven fabrics.
5. the liquid-impervious, breathable barrier material of the described cloth shape of claim 1, wherein, described rete is a monofilm.
6. the liquid-impervious, breathable barrier material of the described cloth shape of claim 1, wherein, described rete is a multilayer film.
7. the liquid-impervious, breathable barrier material of the described cloth shape of claim 1, wherein, the water vapour permeability of described laminate is at least 1000 gram/rice
2/ 24 hours.
8. the liquid-impervious, breathable barrier material of the described cloth shape of claim 1, wherein, the water vapour permeability of described laminate is at least 3000 gram/rice
2/ 24 hours.
9. the liquid-impervious, breathable barrier material of the described cloth shape of claim 1, wherein, described non-woven layer comprises polypropylene and has the random copolymer of the polyethylene about 98% of 3% ethylene contents.
10. the liquid-impervious, breathable barrier material of the described cloth shape of claim 1, wherein, described rete comprises the filler of about 40-about 70% and the polyolefin polymer of about 30-about 60% by the percent by weight number of himself gross weight, or their mixture.
11. the liquid-impervious, breathable barrier material of the described cloth shape of claim 1, it consists essentially of one deck non-woven layer and one deck rete.
12. surgery dust-robe that comprises the liquid-impervious, breathable barrier material of the described cloth shape of claim 1.
13. surgery dust-robe that comprises the liquid-impervious, breathable barrier material of the described cloth shape of claim 11.
14. surgery curtain that comprises the liquid-impervious, breathable barrier material of the described cloth shape of claim 1.
15. surgery curtain that comprises the liquid-impervious, breathable barrier material of the described cloth shape of claim 11.
16. surgery separate type pocket that comprises the liquid-impervious, breathable barrier material of the described cloth shape of claim 1.
17. surgery separate type pocket that comprises the liquid-impervious, breathable barrier material of the described cloth shape of claim 11.
18. industrial protection clothes that comprise the liquid-impervious, breathable barrier material of the described cloth shape of claim 1.
19. industrial protection clothes that comprise the liquid-impervious, breathable barrier material of the described cloth shape of claim 11.
20. the liquid-impervious, breathable barrier material of the described cloth shape of claim 1, wherein, it comprises the thermoplastic elastic polyolefin.
21. the liquid-impervious, breathable barrier material of the described cloth shape of claim 11, wherein, it comprises the thermoplastic elastic polyolefin.
22. goods next to the shin that comprise the liquid-impervious, breathable barrier material of the described cloth shape of claim 1.
23. goods next to the shin that comprise the liquid-impervious, breathable barrier material of the described cloth shape of claim 11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97181055 CN1241966A (en) | 1996-12-27 | 1997-12-19 | Improved cloth-like, liquid-impervious, breathable composite barrier fabric |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/777,365 | 1996-12-27 | ||
| CN 97181055 CN1241966A (en) | 1996-12-27 | 1997-12-19 | Improved cloth-like, liquid-impervious, breathable composite barrier fabric |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1241966A true CN1241966A (en) | 2000-01-19 |
Family
ID=5178055
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97181055 Pending CN1241966A (en) | 1996-12-27 | 1997-12-19 | Improved cloth-like, liquid-impervious, breathable composite barrier fabric |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1241966A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102442019A (en) * | 2010-09-10 | 2012-05-09 | Bha控股公司 | Breathable sealing gasket |
| CN107468345A (en) * | 2017-08-30 | 2017-12-15 | 东莞市鸿德医用塑料制品有限公司 | Easy-tear type sterility protection cover for operating theater instruments protection |
| CN107650480A (en) * | 2017-11-13 | 2018-02-02 | 湖州泰鑫无纺布有限公司 | high strength non-woven fabric |
| CN109153248A (en) * | 2016-03-30 | 2019-01-04 | 克拉考公司 | The Direct precipitation nanofiber in textile substrate |
| WO2021174575A1 (en) * | 2020-02-23 | 2021-09-10 | 山东君泰医用防护用品科技有限公司 | Reusable protective clothing |
-
1997
- 1997-12-19 CN CN 97181055 patent/CN1241966A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102442019A (en) * | 2010-09-10 | 2012-05-09 | Bha控股公司 | Breathable sealing gasket |
| CN109153248A (en) * | 2016-03-30 | 2019-01-04 | 克拉考公司 | The Direct precipitation nanofiber in textile substrate |
| US10814586B2 (en) | 2016-03-30 | 2020-10-27 | Parker-Hannifin Corporation | Direct deposition of nanofiber on a textile substrate |
| CN109153248B (en) * | 2016-03-30 | 2021-03-26 | 帕克-汉尼芬公司 | Direct deposition of nanofibers on textile substrates |
| CN107468345A (en) * | 2017-08-30 | 2017-12-15 | 东莞市鸿德医用塑料制品有限公司 | Easy-tear type sterility protection cover for operating theater instruments protection |
| CN107650480A (en) * | 2017-11-13 | 2018-02-02 | 湖州泰鑫无纺布有限公司 | high strength non-woven fabric |
| WO2021174575A1 (en) * | 2020-02-23 | 2021-09-10 | 山东君泰医用防护用品科技有限公司 | Reusable protective clothing |
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