CN1050317C - Screen for producing a perforated film - Google Patents

Abstract

The present invention relates to a cylindrical screen mesh (14) for penetrating thermoplastic films or sheets (17). The screen mesh (14) is formed by thin plates (31) which are fixed together to form a cylindrical shape. A plurality of openings (41) are arranged in the thin plates (31); the openings (41) of the thin plates (31) are formed into a channel (45) passing through the screen mesh (14). The channel arranged in a degree from 5 DEGC to 60 DEGC is relative to a plane (47); the plane (47) is approximately vertical to the surface of the screen mesh (14).

Description

Be used to produce the screen cloth of perforated film

General range of the present invention more more specifically, then relates to the punching of plastic sheeting for the plastic sheeting of punching.The plastic sheeting that The present invention be more particularly directed to punch, be used for the metallic sieve or the module of the vacuum perforation of plastic sheeting and the method for making this screen cloth.

The plastic sheeting of punching has multiple useful purposes.It is used in gardening and the agricultural, preventing the growth of green grass and weeds, but allows moisture to enter in the following soil by film.Perforated film has very many isolated regularly apertures, and they allow liquid and air or other fluid to infiltrate.This film can be as the element of the disposable garment of health dress ornament aspect such as napkin, diaper, or is used for hospital's mat, bed or sleeping bag lining etc.In this class composite construction, be provided with an outer film layer with desired performance, it is adjacent with skin in the combined type clothing, and this clothing also comprises a filter course or the multilayer of making of absorbent fibrous material.In U.S. Patent No. 3,814, an example of making disposable diaper with perforated film is disclosed in 101.

In the U.S. Patent No. 3,929,135 that authorize the 30 days December in 1975 of Thompson the special perforated film of a class has been described.The patent of Thompson has been introduced a kind of absorbent structure with perforated film top layer, it is characterized by to have a series ofly with certain rule aperture spaced apart from each other, and it is shaped as the taper pore of certain size scope.In final article, they are inside, closely contact with the absorbent fibrous material layer.Like this, the smooth side of perforated film in use contacts with skin.In the clothes structure of general description, even because the relative length of taper pore and the result of surface property, fluid is delivered to absorbed layer by the comprehensive effect that absorbs and opposing refluxes, and is also kept dry and comfortable situation by the described film of the patent of Thompson.

In U.S. Patent No. 3,054, a kind of of the previous method that is used for the perforation of plastic sheeting vacuum disclosed in 148.This patent has been described a kind of stationary cylinder with a molded element or screen cloth, and described element or screen cloth are installed and can be rotated freely thereon around the outer surface of cylinder.Below screen cloth, adopted a vacuum chamber, be used between perforated thermoplastic plastic sheet's respective surfaces, producing pressure differential, so that the plasticising sheet material flows in the opening be located on the screen cloth, thereby make a series of opening, hole or apertures that will on plastic sheet or film, form.

In the U.S. Patent No. of authorizing Zimmerli 3,054,148 of authorizing on September 18th, 1962, a kind of method that the one side has the film of taper pore that is manufactured on has been shown.In this patent, the film of heating is by screen cloth supporting with holes, and effect has vacuum below screen cloth with holes.Vacuum direction below the screen cloth of film upper edge is pulled out aperture, thereby forms the taper pore in film.

Develop the various method that is used for special punch operation in recent years and comprised the perforated screens of specific type or the equipment of rotary molded element.Their example has U.S. Patent No. 4,155, and 693,4,252,516,3,709,647,4,151,240,4,319,868 and 4,388,056.In U.S. Patent No. 4,155, in 693, screen cloth comprises the bonding jumper of a series of punchings, and they are preferably welded together, form a cylinder.U.S. Patent No. 4,252,516 provide a kind of screen cloth, and it has a series of hexagon dimples, and the heart has oval-shaped hole therein.U.S. Patent No. 3,709,647 provide a kind of vacuum of rotation to form roller, and it has the cooling medium of a circulation therein.

U.S. Patent No. 4,151,240 provide a kind of has been perforated and has removed after the projection device with its cooling at film.U.S. Patent No. 4,319,868 have proposed a kind of equipment that is used to make the thermoplastic film, and this film has the boss of the most advanced and sophisticated protuberance of band punching.A kind of special mold pressing roll of structure that is used to finish desired Thinfilm pattern is also disclosed.U.S. Patent No. 4,388,056 discloses a kind of fibroreticulate equipment of an air-flow method that is used for forming continuously, this fleece have phase place opposite, make corrugated lateral margin along cylinder, and have predetermined basis weight profile.Air-flow method cylinder has a honeycomb fashion annular frame, and this framework comprises rib and the transverse slat that extends along circumferentially.Circumferentially be adjacent to be provided with a fixing adjustable air flow adjusting device in the border that radially inwardly is provided with of the arch section of the annular pressure ventilating system of segmentation with the edge, this forced air-ventilating system is established a plurality of forced air-ventilating system sections along circumferentially striding, and the special area that is used to cross the surface of air-flow method cylinder is regulated pressure differential.

The vacuum punching of thin plastic sheeting comprises and will push a mould such as the melt polymer material of polyethylene and other thermoplastic polymer etc.The fusion tablet that leaves the heat of the film of mould or plastic sheet impinge upon rotation, be installed in fixing vacuum drum or the cylindrical screen on the roller online.The vacuum roller has axial slit and one group of sealing gasket along its whole inner surface longitudinal extension, and they all are positioned at the below that the plastics tablet impinges upon the area on screen cloth or the molded element.Guide vacuum from the inside of screen cloth by the slit on the vacuum furnace.The vacuum that exists in the slit is bored a hole it to screen cloth and by the hole on the screen cloth plastic sheeting is formed or molded.Meanwhile, produce the air stream that is used to cool off film.

A critical elements of vacuum treatment device is a cylindrical screen.This molded element has been stipulated aesthetics, sense of touch and the mechanical property of film and the geometrical pattern of perforated film.In a kind of preferred screen cloth manufacturing technology, desired screen patterns is to be plated on the cylindrical drum of special preparation with nickel.Can make and have any seamless circular tubular nickel screen cloth predetermined or desired pattern.Also can adopt other metal such as copper.

But the aperture of the film that the screen cloth of prior art is produced is to pass film to extend to film surface with meeting at right angles basically.This aperture provides direct sight line and the directapath by film.When film was used for the purposes of menstruation or incontinence, this feature of prior art film was out of favour, because still can see the liquid that is collected.Therefore, need a kind of perforated film with masking characteristics, it reduces the observability that is collected liquid.

There is also a desire for a kind of film, it does not provide the directapath of liquid by film.This film can be used as the protective clothing, because the liquid on the contact membrane surface directapath by film not.This feature has improved the protective quality of clothing widely.

The present invention aims to provide a kind of cylindrical screen that is used for thermoplastic film or sheet material perforation.This screen cloth is made with thin sheet material, and they are fixed together, and form a cylindrical shape.On thin plate, be provided with a plurality of apertures, and the aperture on the thin plate forms the passage that passes screen cloth.This passage becomes about 5 ° to 60 ° angle with the vertically disposed plane of screen surface basically with respect to one.

Fig. 1 is the elevation of signal, shows the correlation of the critical piece of the equipment that is used to implement this method.

Fig. 2 is the cutaway view that amplifies, a section of the profiled surface that shows in the method for the invention to be adopted.

Fig. 3 is the schematic sectional view of amplification of the perforated film with broad wool pore of prior art.

Fig. 4 is the schematic sectional view of amplification of the perforated film with taper pore of prior art.

Fig. 5 is the cutaway view of film shaped screen cloth of the present invention.

Fig. 6 is the cutaway view that adopts the perforated film that the screen cloth of Fig. 5 makes.

Fig. 7 is the cutaway view that adopts the perforated film that the screen cloth of Figure 11 makes.

Fig. 8 is the cutaway view that adopts the perforated film that the screen cloth of Figure 12 makes.

Fig. 9 is the cutaway view that adopts the perforated film that the screen cloth of Figure 10 makes.

Figure 10 is the cutaway view of film shaped screen cloth.

Figure 11 is the cutaway view of film shaped screen cloth.

Figure 12 is the cutaway view of film shaped screen cloth.

Figure 13 is the cutaway view that contains the fabric of perforated film of the present invention.

Figure 14 is the protection robe that adopts the fabric of Figure 13.

Figure 15 is the face shield that adopts the fabric of Figure 13.

Figure 16 is the cutaway view of absorption pad or curtain.

Figure 17 is the cutaway view of absorption pad or curtain.

Figure 18 is the cutaway view of greening fabric.

Figure 19 shows the structure of the menopad that adopts film of the present invention.

Figure 20 is the cutaway view along the 20-20 line of Figure 19.

Figure 21 shows the structure of the diaper that adopts film of the present invention.

Figure 22 is the cutaway view along the 21-21 line of Figure 21.

Referring to Fig. 1, the equipment that is used to implement method of the present invention comprises a rotor 10, and the two ends of this cylinder are with axle 11 supportings that are positioned at the center, and axle 11 is by fixed axle supporting 12 supportings.Done a lot of apertures on the cylindrical surface 13 of cylinder 10, passed through from it to allow air.Molded element or screen cloth 14 are installed around the surface 13 of cylinder 10 and can be with cylinder 10 rotations.

Element 14 can be made one and be suitable for being slipped to integrated member on the cylinder 10 from an end of cylinder 10, maybe can twine around cylinder 10, is fixed on the cylinder with any one suitable manner then.For rotating cylinder 10, can adopt a gear drive, it is suitable for and is located at originally on one's body gears engaged of rotating cylinder element, perhaps by means of the lid that is located on the cylinder two ends one pulley transmission mechanism is connected on the cylinder.As shown in Figure 1, utilize a vacuum chamber 15 between each surface of thermoplastic plastic sheet, to produce pressure differential, the plasticising sheet material flowed into be located in the aperture on the molded element 14, thus on sheet material eyeletting.

Referring to Fig. 1 and 2, vacuum chamber 15 is positioned at cylinder 10 along the axis of cylinder 10, and on the circumferential finite part of cylinder at the surface of cylinder opening, contact with the inside on the surface 13 of cylinder 10.Two boards 15A limits this vacuum chamber.For leading edge and trailing edge to chamber 15 provide effective seal, sealing gasket 16 is set, on plate 15A so that surface 13 is formed sealing.Sealing gasket can be used metal, high density polyethylene (HDPE) (HDPE), rubber or other suitable material manufacturing.Plate 15A is static with respect to the direction of rotation of cylinder, and is rigidly fixed on axle 11 or other suitable device, so that chamber 15 remains in cylinder 10 on the fixing or motionless position.Like this, remove the circumferential openings on the cylinder 10, chamber 15 all seals at all each points, and can be pumped into vacuum or decompression by the air-extractor that links to each other with the chamber in any suitable manner.

As can be seen from Figure 1, be positioned at cylinder 10 tops and adjacent with it be a extruding machine 21 with a bite mould 8, it is used for the thermoplastic plastic sheet 17 of heat is extruded onto cylinder 10.In fact have been found that what work well especially is polyolefin as the thermoplastic that is extruded onto on the cylinder 10.When sheet material 17 during from mouth mould 8 operation downwards, this sheet material contacts with the screen cloth 14 that turns clockwise with cylinder 10 in Fig. 1 and 2.The screen cloth 14 of rotation carries sheet material 17 through vacuum tanks 15, and this groove is drawn in the opening of screen cloth 14 and thus by eyeletting thermoplastic.Sheet material is cooled off, so that the thermoplastic of heat is changed over solid state and aperture is solidificated on the film from its molten condition.Sheet material 17 continues detouring on the cylinder 10 and continuing on roller 19 in clockwise manner as shown in Figure 1.

Solid-state sheet material 18 continues upwards operation from roller 19, arrives sided corona treatment roller 22 through roller 21.Common on the sided corona treatment roller 22 coated with suitable dielectric material such as epoxy resin, fluorinated polyethylene (Tai Folong), haloflex (chlorosulfonated polyethylene) or polyester (Mai La).But, also can adopt with the naked roller that carries out of electrode of lining dielectric material and handle film.Electrode or corona rod 23 are suspended on about 1/16 inch place, roller top, and are parallel to treatment tube.Corona rod 23 usefulness transformers and sided corona treatment power source 24 energizes.Sheet material continues to arrive one second idler roller 26 and arrive wind-up roll 27 by an idler roller 25.Should be understood that not all film application all needs the sided corona treatment operation, can remove this part in the described method.In addition, if the final application of film is to be used in a kind of method of series connection, just always do not need film is wrapped on the wind-up roll 27.

Should be pointed out that and also can adopt other forming technology to form perforated plastic films of the present invention.In U.S. Patent No. 4,878, the technology shown in 825 is worked well especially when forming perforated film of the present invention, and it has adopted a supporting that is used to be shaped screen cloth in the vacuum tank district.In U.S. Patent No. 4,839, the technology shown in 216 also can be used together with the present invention, and it utilizes highly pressurised liquid stream that plastic sheeting is bored a hole.Herein, specially with United States Patent (USP) N0.4,878,825 and 4,839,216 technology contents is combined in the present patent application as a reference, with as other method that forms aperture of the present invention.

Fig. 3 and 4 shows the type of the punching plastic foil of prior art, and they were once produced on equipment shown in Figure 1.This film have as shown in Figure 3 straight capillary 3 or taper capillary 4 as shown in Figure 4.In these two kinds of films, aperture is provided with and provides straight sight line and the directapath by film with the angle that roughly becomes 90 ° with respect to film surface.

A kind of configuration that is used to form the screen cloth of the present invention 14 of perforated film is illustrated in greater detail among Fig. 5.The layer structure that screen cloth 14 is made up of a folded single thin plate 31,32,33,34,35,36 and 37.Screen cloth 14 has one to be configured to the outer surface 39 and the inner surface 40 towards vacuum chamber 15 that contact with thermoplastic plastic sheet 17.Described thin plate contains a plurality of openings 41 that pass each gauge of sheet extension.All openings 41 preferably have substantially the same geometry, but, should be appreciated that the shape of opening can be different.The normally stainless photetching metal material of these thin plates, forms opening 41 with photo etching herein on each thin plate.Thin plate has about about 1 to 5mil (translators: thickness 1mil=25.4 μ m) usually.It is good especially to have been found that in the practice that the thin plate work with about 2mil thickness gets.Usually form screen cloth 14 with about about 2 to 20 thin plate.Preferable range in order to the number of the thin plate that forms screen cloth 14 is about 4 to 10.The effective diameter of thin plate upper shed 41 is about 2 to 100mil.Have found that in practice the effective diameter of opening 41 is worked well especially in 7 to 60mil scopes the time.The thin plate of lamination combines togather at contact point when lamination is subjected to heat and pressure.After this, just be rolled into the layer structure that obtains tubular and its free edge is combined, form a continuous tubular-shaped structures.As shown in Figure 5, not alignment with one heart of the opening in the layer structure 41.In contrast, opening 41 is offset circumferentially along same direction, passes the passage 45 of layer structure to form one, and it is with an angle setting.At the opening shown in Fig. 5 41 substantially the same diameter is arranged all, simultaneously, each opening is offset about opening diameter of 1% to 50% from the opening on the adjacent sheet, and the preferable range of skew is 5% to 25% of an opening diameter.Find in practice, work well especially when being offset 10% left and right sides for opening diameter.So just obtain a passage 45 with respect to the angle of about 47 one-tenth 5 ° to 60 ° in plane or straight line, this plane or straight line 47 extend perpendicular to the outer surface 39 of screen cloth 14.This angle usually illustrates as angle A in Fig. 5.

Opening 41 in the thin plate is normally circular, and it is normally columniform to pass the passage 45 that lamination screen cloth 14 forms.But, should be appreciated that the shape of opening can be different, can adopt oval, oval and other shape, and the polygon as rectangle, square, hexagon or octagonal etc. all can be used as opening.

As shown in figure 10, the opening 41 that on each adjacent sheet of lamination, diminishes gradually of screen cloth 14 ' have '.In this mesh structure, formed passage 45 ' pass 14 ' time of screen cloth at passage to reduce gradually.In this special construction, the opening of each opening 41 ' on the adjacent sheet is offset a selected percentage of its diameter.So just obtain a passage 45 ', it passes 14 ' time of screen cloth at passage and restrains continuously and equably.

Screen cloth 14 shown in Figure 11 " has the opening 41 that becomes more and more littler as opening shown in Figure 10 ".But in Figure 11, when passage 45 " passed screen cloth 14 ", the skew in the opening 41 " at screen cloth 14 " was with passage 45 " the same during along the convergence of direction.

As shown in figure 12, screen cloth 14 define passage 45 with compound channel plot.In this embodiment, the thin plate that a part forms screen cloth 14 is offset along a direction, and to form the first 51 of passage 45 , many thin plates form the second portion 53 of passage 45 then along opposite direction skew.Usually, all opening 41 have same diameter and the equal distance of skew in each layer of screen cloth 14 .But, should be pointed out that opening 41 can be varying sized, side-play amount also can change, to form diminishing passage 45 .First's 51 residing angle A of passage 45 are with respect to the straight line that extends perpendicular to outer surface 39 of screen cloth 14 or plane 47 ' be approximately about 5 ° to 60 °.Second portion 53 residing angle B are approximately about 5 ° to 60 ° with respect to plane or straight line 47.

Fig. 6 shows once the cross section of the film 54 that forms with screen cloth shown in Figure 5.Film 54 has a first surface 59 and a second surface 64.First and second surfaces of film are in substantially parallel relation usually.This film has a plurality of apertures 52, and they form the capillary 55 in this film.Capillary 55 has substantially the same diameter and with respect to the angle A perpendicular to about one 5 ° to 60 ° of plane 47 skews of the first surface 59 of film.The shape of capillary 55 is essentially cylindrical, it has a sidewall 62, form a passage 65, have on the surface 59 of film 54 first perforate 58 and in second perforate 60 at 57 places, end of capillary 55, the first surface 59 of end 57 and film 54 is from a distance.57 surfaces 59 common and film 54, end of capillary 55 separate one and are approximately 0.005 to 0.05 inch distance, and this is preferably about 0.007 to 0.025 inch at interval.Perforate 58 and perforate 60 all have a mid point or geometric center, and the mid point of the mid point of perforate 58 and perforate 60 staggers.Stagger about 5% to 200% distance of the diameter that is about perforate 60 of the mid point of the mid point of perforate 60 and perforate 58, its preferred range be perforate 60 diameter about 75% to 125%.As seen from Figure 6, capillary 55 has a plurality of steps or ridge 56, and they are that thin plate by the biasing of screen cloth 14 causes.Ridge 56 in the film 54 be basically fillet rather than by the formed wedge angle of biasing thin plate that forms screen cloth 14.

Fig. 9 show the film 54 that utilizes screen cloth shown in Figure 10 to form ' cross section.Film 54 ' basic identical with film shown in Figure 6, just sidewall 62 ', each capillary 55 ' and passage 65 ' when its first surface 59 ' extension, diminish gradually from film.

Fig. 7 shows the film of producing with the screen cloth of Figure 11 54 " cross section.In this film, capillary 55 " sidewall 62 " and passage 65 " hasten forward on its surface from film and diminish gradually when leaving, particularly restrain in a side along a direction.

Fig. 8 shows the film of producing with screen cloth shown in Figure 12 54 " one section cross section.In this figure, capillary 55 and passage 65 have a first 61 and a second portion 63, described first is provided with in the mode with respect to plane 47 angled A that arrange perpendicular to first surface 59 of film, second portion is provided with in the mode with respect to plane 47 angled B, simultaneously, two angles with respect to plane 47 all are about about 5 ° to 60 °.In Fig. 8, capillary 55 diminish when its first surface 59 from film 54 advance usually gradually.But, should be appreciated that capillary 55 also can have the wall of not restraining.

Above-mentioned film all has such capillary, and they are with such angle setting, and promptly it act as and blocks the straight sight line of passing opening, and this opening is perpendicular to the surface of film.Therefore, film has masking characteristics, so that at capillary during perpendicular to the first surface 59 of film, passes the liquid that can not that film arrives absorbing structure and is seen by the user.This is a particular importance to the purposes that is applied to menstruation or incontinence aspect.The coverage degree that is produced by film will be directly proportional with the degree of convergence of angle capillaceous, length and capillary form in the film.This film is useful to preventing that undesirable liquid from passing directly flowing of film also.Because capillary is provided with at an angle, the liquid that can not that drops on the film surface has the directapath of passing film.In contrast, liquid has to change direction, to pass capillary.When liquid may directly contact with the surface of protective clothing, this film can be used for the protective clothing.Film of the present invention can reduce liquid and pass the trend that capillary directly splashes, and has strengthened the protective ability of clothing widely.

Figure 13 shows the layered fabric material that adopts film of the present invention.Layered fabric material 70 has one lightweight ventilative outer 73.Outer 73 normally a kind of paperys cover bases, and its weight is very light and can breathe freely to heavens.Then be a non-woven material layer 75, it is ventilative, but to passing liquid generation the passing through resistance of this one deck.Particularly, the good resistance of mobile generation of the non-woven material pair liquid that contacts with non-woven material.Inflation polypropylene, polyethylene or the polyester of fusion all can be used as non-woven material, because these materials have gratifying fluid resistance level.Following one deck in the fabric 70 is a thermoplastic film 79, and it has many apertures 81, and these apertures form capillaries 83, and they are with respect to the angle setting of a plane vertical with film surface 85 into about 5 ° to 60 °.Thermoplastic film 79 will be placed to capillary 83 is extended and contact with it towards non-woven material.The capillary 83 that is formed by aperture 81 allows film 79 ventilative, but can pass directly flowing of film by barrier liquid again.Though shown film 79 is similar substantially to the film 54 shown in Fig. 6, should be appreciated that in layered fabric material 70, also can with Fig. 7,8 films similar with film shown in 9 are used for film 79.The one deck that descends again in the layered fabric 70 is a second layer non-woven material 87, and the surface 85 of its position and film 79 is adjacent.Second layer non-woven material 87 is intended to one deck that conduct contacts with the user's of textile material 70 skin.If do not desire to make textile material to contact, then can remove second layer non-woven material 87 with user's skin.

The purpose of textile material 70 provides a kind of breathable structure, and it has the particularly ability of liquid infiltration of good opposing fluid.Plan is used in such place with fabric 70, even liquid splash or be sprayed on the material, material provides stopping that convection cell directly passes simultaneously.This fabric can be used for waste liquid field or people other interesting field of liquid to preventing to splash or spray of medical field, danger.

Figure 14 shows protective robe 89, and Figure 15 shows protective face shield 91, and they can be made with layered fabric 70.For protective robe 89,,, then can save second layer non-woven material 89 so that the inner surface of robe does not contact with user's skin if plan robe is through the clothes outside.For protective robe 89 and face shield 91, splash or the liquid that sprays will contact with the skin 73 of fabric.Liquid will pass provides the non-woven material 75 that stops to liquid infiltration, and then, liquid contacts with the thermoplastic film 79 with angled capillary 83.When liquid junctions thermoplastic film 79, do not pass the directapath of film, and the speed of liquid is greatly reduced.The structure of layered fabric 70 be intended to prevent liquid directly by and a ratio used much higher protection level of gas permeable material at present is provided.

Figure 16 shows the application of thermoplastic film of the present invention in absorbent pad or curtain 88.In this structure, film 79 is placed on one deck absorbent material 93.Film 79 so is provided with so that the capillary 83 that is formed by aperture 81 contacts with absorbent material 93.Adopt this structure, acting as of capillary 83 will be drawn in the absorbent material 93 at the liquid on thermoplastic film 79 the surface 85.The angle of capillary 83 can prevent that the edge from entering in the absorbent material 83 perpendicular to the straight sight line of the straight line of film surface, thereby makes the liquid that is included in the absorbent material 83 be not easy to be seen when the surface 85 of viewing film 79.

Figure 17 shows can be with the mat of thin film fabrication of the present invention or another embodiment of curtain 90.Be arranged to make surface 85 to contact film 79 with one deck absorbent material 93.Film 79 to be placed to the capillary 83 that is formed by aperture 81 is extended along the direction of leaving absorbent material 93.When capillary 83 leaves absorbent material 93 extensions, as the liquid that splashes or spray the bigger resistance that sees through is arranged for the liquid that pressure is arranged.

Figure 18 shows with thermoplastic film 79 as greening fabric 94.In this uses, with film be placed to make capillary 83 towards its go up ground 95 extensions of placing film.Aperture 81 allows moisture such as rainwater to pass film with capillary 83 and arrives ground 95.But the capillary 83 of band angle is eliminated effectively or has been reduced the light amount that can pass film to greatest extent.So just in the zone of placing film, prevent weed growth or other bad growth.But,, therefore be not difficult to handle rainwater or concentrated rainwater because rain can pass film.In the application that requires extra intensity, can be on the surface 85 of film 79 laminating layer non-woven material 97, so that added strength to be provided.It is also understood that also can lamination non-woven material 97 in the reverse side of film 79, to provide added strength to greening fabric 94.

Figure 19 and 20 shows the menopad or the feminien hygiene pad that can constitute with film of the present invention.Pad 105 has the thermoplastic film 79 of one deck punching, and it is positioned on the absorbent cores 107.Film 79 to be placed to the end of the capillary 83 that extends from film is contacted with absorbent cores 107.Absorbent cores can comprise that one or more layers non-woven material 109 and one has the wadding or the gel rubber material 111 of high absorption ability.Be sidelong in relative with film 79 one of absorbent cores 107 and be equipped with a fluid-tight thermoplastic film 113.

Figure 21 and 22 shows a kind of diaper goods 115 that can utilize film of the present invention to make.Diaper 115 has the thermoplastic film 79 of one deck punching, it be placed on an absorbent cores 117 above.Film 79 will so be placed, so that the end of the capillary 83 that stretches out from film contacts with absorbent cores 117.Absorbent cores can comprise that one or more layers non-woven material 119 and one has the wadding or the gel rubber material 121 of high absorption ability.Be sidelong in relative with film 79 one of absorbent cores 117 and be equipped with fluid-tight thermoplastic film 123.

Should be pointed out that the thin layer 79 shown in Figure 19～22 can foregoingly equally provide being retained in the coverage of the liquid in the absorbent core material.

Should be understood that to Fig. 7,8 films similar and also can be used as film 79 in using shown in Figure 16-22 with the film shown in 9.

Foregoing description of the present invention can be made and remove in addition various improvement and the replacement of being mentioned just for explanation is provided.

Claims (24)

1. lamination cylindrical screen that is used for thermoplastic film perforation comprises: two or more thin thin plate, and they are fixed together, and form a cylindrical shape; A plurality of openings that are positioned on each of above-mentioned thin plate, above-mentioned opening has identical geometry and diameter identical or that diminish gradually, setover along same direction circumferentially with respect to the center of the opening of adjacent sheet in the center of the above-mentioned opening on a thin plate, pass the ramp way of above-mentioned screen cloth with formation, above-mentioned passage is provided with an acute angle (A) that limits between one first straight line and one second straight line, the center of the opening of the wherein said first straight-line pass adjacent sheet, described second straight line is provided with perpendicular to a surface of above-mentioned screen cloth, described passage has stoped the straight sight line along the second line, is 1% to 50% distance of the above-mentioned diameter of above-mentioned opening from the skew of the above-mentioned opening on adjacent sheet one at the above-mentioned opening on the adjacent sheet.

2. screen cloth as claimed in claim 1 is characterized by, and the above-mentioned opening on a thin plate is 5% to 25% distance of the above-mentioned diameter of above-mentioned opening from the skew of the above-mentioned opening on the adjacent sheet one.

3. screen cloth as claimed in claim 1 is characterized by, and above-mentioned acute angle (A) is 5 ° to 60 °.

4. screen cloth as claimed in claim 1 is characterized by, and above-mentioned opening is circular, and above-mentioned passage is cylindrical.

5. screen cloth as claimed in claim 4 is characterized by, and all above-mentioned openings all have same shape.

6. screen cloth as claimed in claim 1 is characterized by, and the size of the above-mentioned opening in the above-mentioned thin plate can change, and above-mentioned thus passage is assembled when above-mentioned passage extends through above-mentioned screen cloth.

7. screen cloth as claimed in claim 1, it is characterized by, above-mentioned passage has first and second portion, in first, above-mentioned opening is provided with angle (A), second portion is that 5 ° to 60 ° acute angle (B) is provided with one, wherein, angle (B) forms between one the 3rd straight line and described second straight line, the center of the above-mentioned opening of described the 3rd straight-line pass on above-mentioned second portion, second straight line is provided with perpendicular to the above-mentioned surface of above-mentioned screen cloth, and above-mentioned second portion extends along the direction opposite with above-mentioned first.

8. screen cloth as claimed in claim 1 is characterized by, and above-mentioned thin plate has 1 to 5mil thickness.

9. screen cloth as claimed in claim 8 is characterized by, and above-mentioned thin plate has the thickness of 2mil.

10. screen cloth as claimed in claim 1 is characterized by, and forms above-mentioned screen cloth with 2 to 20 thin plates.

11. screen cloth as claimed in claim 1 is characterized by, and forms above-mentioned screen cloth with 4 to 10 thin plates.

12. screen cloth as claimed in claim 1 is characterized by, the diameter of above-mentioned opening is 2 to 100mil.

13. screen cloth as claimed in claim 1 is characterized by, the diameter of above-mentioned opening is 7 to 60mil.

14. a cylindrical screen that is used for thermoplastic film's perforation comprises: the plate that at least one is relatively thinner, they are fixed together, to form a cylindrical shape; A plurality of openings that are positioned on the above-mentioned thin plate, each above-mentioned opening defines the passage of an inclination, it has the center of passing above-mentioned screen cloth, it is characterized by, above-mentioned passage is 5 ° to 60 ° acute angle setting with one, and above-mentioned acute angle limits between one first straight line and one second straight line, the center of the above-mentioned passage of described first straight-line pass, described second straight line is provided with perpendicular to a surface of thin plate, and above-mentioned passage stops the direct sight line along second straight line.

15. screen cloth as claimed in claim 14 is characterized by, above-mentioned opening is circular, and above-mentioned passage is cylindrical.

16. screen cloth as claimed in claim 15 is characterized by, all above-mentioned openings all have same shape.

17. screen cloth as claimed in claim 14 is characterized by, the size of the above-mentioned opening in the above-mentioned thin plate can change, and above-mentioned thus passage is assembled when above-mentioned passage extends through above-mentioned screen cloth.

18. screen cloth as claimed in claim 14, it is characterized by, above-mentioned passage has a first and a second portion, in first, above-mentioned opening thinks that 5 ° to 60 ° angle (A) is provided with, second portion thinks that 5 ° to 60 ° angle (B) is provided with, wherein, acute angle (B) limits between one the 3rd straight line and described second straight line, the center of the above-mentioned opening of described the 3rd straight-line pass in above-mentioned second portion, and second straight line is provided with perpendicular to the above-mentioned surface of above-mentioned screen cloth, and above-mentioned second portion extends along the direction opposite with above-mentioned first.

19. screen cloth as claimed in claim 14 is characterized by, above-mentioned gauge of sheet is 1 to 5mil.

20. screen cloth as claimed in claim 19 is characterized by, above-mentioned gauge of sheet is 2mil.

21. screen cloth as claimed in claim 19 is characterized by, and forms above-mentioned screen cloth with 2 to 20 thin plates.

22. screen cloth as claimed in claim 19 is characterized by, and forms above-mentioned thin net with 4 to 10 thin plates.

23. screen cloth as claimed in claim 14 is characterized by, the diameter of above-mentioned opening is 2 to 100mil.

24. screen cloth as claimed in claim 14 is characterized by, the diameter of above-mentioned opening is 7 to 60mil.

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