RS57386B1 - Non-woven gauze product and method and system for manufacturing the same - Google Patents

Description

DESCRIPTION

Technical field

This invention relates to the field of gauze production, and in particular to a non-woven product such as gauze and a method and system for its production.

State of the art

Gauze is a type of woven material with a warp and weft structure. Due to its advantages of softness, comfort, excellent breathability, lack of skin stimulation, good moisture absorption characteristics, strong stretch resistance and low shedding, gauze is widely used in the medical field. Traditional uses of gauze include medical gauze, adhesive tapes, bandages, and breathing masks.

The conventional gauze production process is based on warp and weft formation and processes including cotton opening and cleaning, drawing, cotton strip formation, roving formation, twisting yarn formation, winding, weaving, weaving, etc. Such a procedure has disadvantages due to a long production process, complex production, high labor costs, high energy consumption, poor production environment, thread termination at the edges, and the like. After the end of the thread is dropped and even left in the human body during surgery, it will lead to a worsening of the patient's condition. Therefore, there is a need for a new gauze production process.

The non-woven material made by the existing thread twisting process does not have a dense or sparse structure. Such a fabric with a dense structure has disadvantages that are reflected in the sharpness to the touch, poor creasing and low speed of absorption; while the fabric that has a rare structure has disadvantages that are reflected in greater surface tufting, easy peeling, shedding, thread loss and low strength. Both of these types of non-woven materials are not a substitute for existing woven gauze in terms of appearance, texture or characteristics, especially when it comes to application in the medical field due to their disadvantages, especially due to low absorption rate, easy peeling and shedding.

Document CN 102277692 describes a process for producing gauze using a device with a twisting drum comprising a second drum sleeve having a coating layer on the surface of the drum and comprising a second cylinder and a support web for threading.

Document EP 1688522 describes a process for the production of hydro-bonded non-woven materials comprising the steps of cleaning cotton, drawing, expanding the web, washing with water jets, bleaching, drying and rolling the finished product.

Document US 5098764 describes a nonwoven material comprising groups of parallel yarn-like fibers and densely packed fiber segments, where the groups comprise fiber segments that are circumferentially wrapped around at least a portion of the fiber groups.

Presentation of the essence of the invention

According to a first aspect of the present invention, a system for producing a non-woven product such as gauze comprises:

picker for opening, cleaning and mixing raw cotton;

a machine for carding, i.e. pulling cotton (so-called "carder") located after the picker for further opening and cleaning of raw cotton and pulling it to form a network of fibers;

a folding platform after the drawing machine for stretching and folding the fiber nets in a given way;

a conveyor for conveying the marking thread to the folding platform and placing it between the upper and lower webs of fibers fed from one or more carding machines; wherein the folding platform has a press roller for embedding the marking thread coming from the conveyor to the place between the upper and lower fiber webs when stretching and folding the fiber webs;

a device for hydro-splicing (or hydro-entanglement, so-called "spunlacing") located after the folding platform for water jet action on the folded fiber networks; wherein the hydro-joining device comprises a first hydro-joining machine and a second hydro-joining machine; wherein the first hydro-bonding machine comprises a first rotating drum and a first hydro-bonding support web surrounding the first drum; wherein the second hydro-bonding machine comprises a second rotating drum, a second hydro-bonding carrier web surrounding the second drum, wherein the second hydro-bonding carrier web has a forming layer, wherein the forming layer has thereon pointed protrusions arranged in a matrix and through holes, wherein each pointed protrusion has a conical top and bottom of rectangular cross-section, where the bottom size of each pointed protrusion is greater than the bottom distance between two adjacent pointed protrusions; and

a post-processing device located after the hydro-bonding device and intended for further processing of the product obtained after water jet treatment to obtain a non-woven product such as gauze.

According to another aspect of the present invention, the process of producing a non-woven product such as gauze using the previously described system, comprises:

the picking step to open, clean and mix the raw cotton; the step of carding, i.e. pulling the cotton to further open and clean the raw cotton and pulling it to form a network of fibers; a lapping step for stretching and lapping the fiber webs according to a given specification, wherein the lapping step further comprises:

embedding marking threads between two layers of fiber mesh; the step of acting with jets of water on the folded webs that are introduced into the hydro-joining device, where this step includes: pre-wetting the fiber network with low-pressure water during the introduction of the fiber network into the device; applying water under pressure to the wetted fiber webs to displace and entangle the forming layer fibers of the second hydro-bonding machine under the impact of the water jet, and to form a rectangular hole in the water jet washed fiber web; washing the web of fibers from the rear side with water from the nozzles using the first hydro-joining machine and washing the web of fibers from the front with water from the nozzles using the second hydro-joining machine; and

the steps of post-processing the product obtained after washing with water jets to obtain a non-woven product such as gauze.

According to a third aspect of the present invention, a gauze-like non-woven product produced using the above-described system, comprising a hydro-bonded non-woven fabric with matrix-arranged quadrangular holes and formed under the action of water jets, where the quadrangular holes arranged in a row are in a flat structure with the warp and weft, and wherein the dimension of each square hole is greater than the linear width of the warp and weft, wherein the gauze-like non-woven product further comprises a marking thread embedded between the hydro-bonded fibers non-woven fabric and where its upper and lower surfaces are covered with bonded twisted fibers.

In a nonwoven product such as gauze and the manufacturing process and system described herein, the hydro-bonding device comprises another hydro-bonding machine with a shaping layer on the surface, wherein the shaping layer has pointed protrusions arranged in a matrix, where each pointed protrusion has a conical top and bottom of a rectangular cross-section where the bottom size of each pointed protrusion is greater than the bottom distance between two adjacent pointed protrusions. A nonwoven fabric with matrix-arranged rectangular holes is formed from a web of fibers processed by water jet in another hydro-bonding machine. The rectangular matrix-arranged holes are represented in a flat warp and weft structure, where the dimension of each rectangular hole is greater than the linear width of the warp and weft. The structure and characteristics of such non-woven material are similar to the characteristics of gauze, so non-woven fabric can be a substitute for existing gauze. According to this invention, a non-woven gauze fabric is obtained by applying the described production process using hydro-bonding, while the described production process has the advantages of short production time and low costs, which reduces the cost of the thus produced non-woven product such as gauze.

Brief description of the draft images

Figure 1 is a diagram of the schematic structure of a system for the production of a non-woven product such as gauze according to an embodiment based on the description of the invention;

Figure 2 represents a diagram of the schematic structure of the hydro-joining device according to the embodiment of the invention;

Figure 3 is a diagram of the schematic structure of the first hydro-joining machine in the hydro-joining device according to the embodiment of the invention;

Figure 4 is a diagram of the schematic structure of the first hydro-joining machine in the hydro-joining device according to the embodiment of the invention;

Figure 5 is a diagram of the schematic structure of the second hydro-joining machine in the hydro-joining device according to the embodiment of the invention;

Fig. 6 is a diagram of the schematic structure of the second hydro-joining machine in the hydro-joining device according to the embodiment of the invention;

Figure 7 is a diagram of the schematic structure of the second hydro-joining support network of the second hydro-joining machine in the hydro-joining device, and according to the embodiment of the invention;

Figure 8 is a diagram of the schematic structure of the pointed protrusions on the forming layer in the second hydro-joining machine of the hydro-joining device, and according to the embodiment of the invention;

Figure 9 is a diagram of the schematic structure of the pointed protrusions on the forming layer in the second hydro-joining machine of the hydro-joining device, and according to the embodiment of the invention;

Fig. 10 schematically represents an outside, side view of a second hydro-joining machine in a hydro-joining device, and according to an embodiment of the invention;

Figure 11 schematically represents an inside, side view of a second hydro-joining machine in a hydro-joining device, and according to an embodiment of the invention; Figure 12 schematically represents an inside, side view of a second hydro-joining machine in a hydro-joining device according to another embodiment of the invention;

Figure 13 schematically represents a flow diagram of the process for producing a non-woven product such as gauze according to the embodiment of the invention;

Figure 14 is a diagram of the schematic structure of a non-woven product such as gauze according to an embodiment of the invention;

Figure 15 is a schematic diagram of the local structure of a system for producing a non-woven product such as gauze according to an embodiment of the present invention;

Fig. 16 is a diagram of the schematic structure of a nonwoven product such as gauze according to another embodiment of the present invention;

Fig. 17 is a diagram of the schematic structure of a piece joining wire according to another embodiment of the present invention.

Detailed description of the implementation of the invention

The basic idea of the present invention is to enable the production of gauze by applying a non-woven hydro-bonded fabric production process that has the characteristics of short production time, low production costs and advanced automation. Considering that the non-woven gauze produced using the process described here has the same advantages as the well-known gauze, such a production process can be a substitute for the well-known gauze production process, as a result of which the price of the obtained product such as gauze is significantly reduced.

The known process of hydro-bonding can only, due to the structural limitations of the hydro-bonding device, produce a hydro-bonded non-woven fabric having unevenly distributed holes, as a result of which the favorable characteristics possessed by gauze are not obtained.

According to an embodiment of the present invention, there is an improvement in the hydro-bonding apparatus and a non-woven fabric possessing all the advantages of gauze can be produced on a rotating drum by processing with water jets.

The present invention is further described in more detail below with reference to specific embodiments and the accompanying drawings.

Performance and invention

According to Figure 1, the system for producing a nonwoven product such as gauze described in this embodiment includes a picker 601, a weight separator 602, a cotton collector 603, a cotton opener 604, a cotton mixer 605, a cotton cleaner 606, a carding machine 607, a folding platform 608, a hydro-bonding device 609, and a post-processing device 610.

The cotton picker 601 is used to capture raw cotton fibers and send them to downstream devices in the system for processing. The picker may be a reciprocating picker and may be applied to different grades of raw cotton and/or cotton-like man-made fibers.

A weight separator 602 is located after the picker to separate and remove the heavy matter mixed in the raw cotton fibers coming from the picker. According to other embodiments, the system for the production of non-woven products such as gauze can additionally contain an iron absorption device as well as a diverter for heavy materials and metal placed between the picker and the weight separator. An iron absorption device is located after the picker to check and remove the metal mixed with the raw cotton fibers. The iron absorption device can be made in the form of a bridge in order to absorb iron and the like. A diverter for heavy materials and metal is located after the iron absorption device to check and remove metal and heavy materials and prevent fire.

The cotton picker 603 is located after the weight separator to collect the raw cotton fibers processed by the weight separator and discharge the collected raw cotton fibers.

The cotton opener 604 is located after the cotton picker to open and clean the raw cotton fibers collected by the cotton picker. According to this embodiment, the cotton opener is a single step axial cotton opener.

The 605 cotton agitator is located after the cotton opener to agitate and release the open raw cotton fibers. According to this embodiment, the cotton mixer is a multi-compartment cotton mixer.

Cotton cleaner 606 is located after the cotton mixer for fine separation and cleaning of freed and mixed raw cotton fibers.

The carding machine 607 is located after the cotton gin to draw fine and separate raw cotton fibers, remove impurities and/or short strands of cotton, and to form cotton threads. According to other embodiments, the system for the production of nonwoven products such as gauze may additionally contain a machine for sorting foreign fibers, a machine for removing dust, an iron absorption device and a pneumatic hopper for supplying cotton, all of which are located between the cotton cleaner and the carding machine. The foreign fiber sorting machine is located behind the cotton gin to remove the foreign fibers mixed with the raw cotton fibers. The dust removal machine is located after the foreign fiber sorting machine to remove the fine impurities contained in the raw cotton fibers. An iron absorption device is located after the dust removal device to check and remove metals mixed with the raw cotton fibers. By way of example, the absorption device has a bridge shape to absorb iron and similar metals. A pneumatic cotton feed hopper is located after the iron absorption device to evenly feed the raw cotton fibers into the carding machine.

A folding platform 608 is located behind the carding machine to stretch and fold fiber webs to a given specification.

It should be emphasized that in the folding platform, the number of layers of the fiber network to be stretched and folded is determined based on the real need. Typically, fiber webs are obtained from the output of multiple parallel carding machines and are stretched and folded on a folding platform. Figure 1 illustrates two carding machines. The number of carding machines is selected based on the width and weight of the fibers. According to some embodiments, if there is only one carding machine, the folding platform only acts as a transport platform without stretching and folding the fiber web. According to this embodiment, the folding platform 608 can extend the fiber network in a parallel fashion or by shearing (zigzag).

A hydro-bonding device 609 is located behind the folding platform to apply water jets to the folded fiber webs.

Referring to Figure 2, according to this embodiment, the hydro-joining device includes a first hydro-joining machine 30 and a second hydro-joining machine 40 .

The first hydro-bonding machine 30 includes a first rotating drum and a first hydro-bonding support web 312 surrounding the first drum; the second hydrobonding machine 40 includes a second rotating drum and a second hydrobonding support web 412 surrounding the second drum.

Hydro-joining heads 10 are arranged along the circumference of the first and second hydro-joining machines. Pre-moistened hydro-joining heads are located at the inlet of the rotating drum device. The rotary drum continuously rotates to move the web 20 of fibers along the direction B. The first hydro-bonding machine 30 is a rotary drum with a water-jet interlacing function, while the second hydro-bonding machine 40 is a rotary drum with a water-jet forming function. The fiber web 20 first passes through a first hydro-bonding machine 30 to water jet the fiber web from the rear, after which it passes through a second hydro-bonding machine 40 to water jet the fiber web from the front. In order to produce a hydrobonded nonwoven fabric with a gauze structure, the first hydrobonding machine 30 and the second hydrobonding machine 40 of the rotating drum device have different drum sleeves and during the action of the water jets on the fiber network 20 from the rear side, rectangular holes are formed.

According to Figures 3 and 4, the first roller of the first hydro-joining machine 30 contains the sleeve 31 of the first rotating drum, the sealing element 32 and the inner container 33. The sleeve 31 of the first rotating drum is surrounded by the surface of the rotating drum to carry the network of fibers 100 which needs to be treated with water jet. One end of the inner container 33 of the rotating drum is connected to the gas-water separator

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(not shown in pictures). Each head 10 for hydro-joining respectively has an opening 34 for the suction of the suction groove. The suction port 34 is in communication with the support frame 35. The suction port 34 and the support frame 35 form a suction system, that is, a negative pressure system used to draw water from the fiber web 100 and the sleeve 31 of the first rotating drum. The sealing element 32 is placed between the inner container 33 and the sleeve 31 of the first rotating drum and is used to seal and hold the sleeve 31 of the first rotating drum. The sleeve 31 of the first rotating drum contains the drum 311 of the sleeve of the first rotating drum. The first support web 312 for hydro-coupling is located outside the drum 311 of the sleeve of the first rotating drum. The first support web 312 is used to support the fiber web during its water jet treatment. The drum 311 of the sleeve of the first rotating drum can be made of a sheet of steel with holes drilled, or of a honeycomb mesh that is rolled to form a cylinder. The first support mesh 312 may be a wire mesh made of prochromium, or a wire mesh made of nickel. The first carrier mesh 312 may also be a two-layer mesh, for example a folded two-layer mesh with a prochrome wire mesh and a nickel wire mesh. When the rotating drum is in operation, the inner container 33 is stationary, while the sleeve 31 of the first rotating drum rotates. The hydro-coupling heads 10 inject jets of water onto the surface of the first support web 312 in the direction of the arrow as shown in Figure 4 .

According to Figures 5 to 9, the second sleeve of the second hydro-joining machine 40 (i.e., a rotating drum with a water jet forming function) contains a sleeve 41 of the second rotating drum, a sealing element 42, and an inner container 43. A suction port 44 is formed inside the sleeve 41 of the second rotating drum to collect water. The suction opening 44 is in communication with the supporting frame 45. The sleeve 41 of the second rotating drum contains the drum 411 of the sleeve of the second rotating drum. A second support web 412 for hydro-coupling is located outside the drum 411 of the sleeve of the second rotating drum.

The drum 411 of the sleeve of the second rotating drum is a net for punching holes that is shaped into a cylinder shape, for example by making the drum a prochrome sheet with holes punched in it. The drum 411 of the sleeve of the second rotating drum adheres to the inner surface of the second carrier network 412 in order to provide support to the second carrier network 412 so that during the action of the water jet it can withstand the load resulting from the negative pressure that is applied for better drainage and water pumping, and as a result, for better entanglement of the fibers on the second carrier network 412.

According to Figures 7 to 9, the second support network 412 contains a layer 413 for shaping, on which pointed protrusions 414 are formed, which are arranged in a matrix and with a through hole, where each of the pointed protrusions 414 has a rectangular cross-section, where the size (d1) of the bottom of each pointed protrusion 414 is greater than the bottom distance (d2) between two adjacent pointed protrusions. bulges. The dimensions of the bottom of each pointed protrusion 414 refers to the width and length of the rectangular cross section of the bottom of the pointed protrusion 414. The bottom distance between two adjacent pointed protrusions refers to the vertical interval between the edge of the pointed protrusion 414 and the edge of the nearest adjacent pointed protrusion. As shown in Figure 8 and Figure 9, the distance d1 is greater than the distance d2.

A forming layer 413 , which functions to form rectangular holes in the nonwoven hydrobonded fabric, is disposed on the surface layer of the second hydrobonding carrier web 412 . According to Figure 8 and Figure 9, the pointed protrusion 414 includes a cuboidal portion 4141 at its lower end and a pointed portion 4142 at its upper end. Figure 8 and Figure 9 show two different shapes of the peak portion 4142; however, according to other embodiments, the shape can also be changed to suit actual requirements. The top part 4142 is formed by a conical tip of a pointed protrusion which makes the formation of quadrangular holes in the web of fibers during the action of water jets easier.

According to this embodiment, the bottom distance between two adjacent pointed protrusions is 0.1 to 1 mm, the density of pointed protrusions on the forming layer 414 is not less than 50 per square inch, for example, where a density of 75 per square inch is selected for the production of gauze with a sparser structure.

According to Figure 10 and Figure 11, Figure 10 shows a side view of the sleeve 41 of the second rotating drum, while Figure 11 shows a side view of the sleeve 41 of the second rotating drum.

Through-holes 415 are provided around each pointed protrusion 414 on the forming layer 413 for pumping out waste water after water jet treatment.

Suction port 44 is in communication with through holes 415. The through holes are not indicated in Figure 7.

The molding layer 413 is made of a polyester polymer or a metallic material, such as a polycarbonate material. The pointed protrusions 414 on the molding layer 413 can be made by a casting process.

Figure 12 shows an inner side view of the sleeve 41 of the second rotating drum according to another embodiment. The hydro-bonding support web 412 may additionally include a buffer layer 416 that adheres to the inner surface of the shaping layer 413 . The baffle layer 416 is a metal wire mesh, for example a wire mesh made of prochrome. A baffle layer 416 is used to prevent fibers from entering the suction port 44 along with water from the water jet. Additionally, the water jet acting over the fibers is slightly deflected by the baffle layer 416, which makes the fibers better entangled with the shaping layer 413. The second support web 412 for hydro-coupling, the baffle layer 416 and the drum 411 of the sleeve of the second rotating drum are successively combined without misalignment. The dimensions of the opening of the baffle layer 416 are larger than the dimensions of the through hole 415, which gives better effects in terms of water flow rejection. The thickness of the drum 411 of the sleeve of the second rotating drum is greater than the thickness of the second support net 412 and the buffer layer 416, which plays a good role when it comes to performing a support function.

According to this embodiment, the pointed protrusions 414, each with a conical tip, which are formed on the forming layer 413 of the second hydro-joining machine 40, form rectangular holes evenly distributed in the form of a matrix on the web of fibers during the action of the water jet. Cotton fibers that are woven between adjacent rectangular holes form a criss-cross warp and weft structure. Since there is no overlap between the warp and the weft, the shaping layer 413 is flat except for the bulges and through holes. Therefore, the flat structure of the warp and weft is present on the hydrobonded nonwoven material, and the width and length of each rectangular hole are respectively greater than the width of the warp and weft, thereby improving the softness and hydroscopicity of the hydrobonded nonwoven material, as a result of which such a new hydrobonded nonwoven fabric achieves a gauze effect.

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The post-processing device 610 is located after the hydro-bonding device for additional processing of the product obtained by the action of the water jet, in order to obtain a non-woven product such as gauze. The post-processing device may include a degreasing device and a bleaching device, a dryer, a winder, a cutter, and the like.

According to Figure 13, the process of producing a non-woven product such as gauze using the previously described system which, accordingly, is covered by this embodiment implies:

Step 701, picking the cotton, that is, capturing the raw cotton fibers and passing the captured raw cotton fibers to the next device in the processing device system. Raw cotton fibers are typically a material that is composed entirely of cotton.

Step 702: weight separation, that is, the separation and removal of heavy materials mixed with the raw cotton fibers delivered by the picker. Step 704: cotton collection, i.e. collection of raw cotton fibers.

Step 705: cotton mixing, ie mixing and release of exposed cotton fibers.

Step 706: cotton cleaning, i.e. fine separation and cleaning of the initially released and mixed raw cotton fibers.

Step 707: carding or drawing, i.e. carding the finely separated and cleaned raw cotton fibers, removing impurities and/or short cotton strands and forming a web of fibers.

Step 708: folding, that is, stretching the fiber network and folding according to the given specification. It should be emphasized that in the overlapping step, the number of layers of spread fiber networks is determined according to specific needs. In a typical case, fiber webs obtained at the output of one or more parallel carding machines are folded on a folding platform. According to some embodiments, if there is only one carding machine, the folding platform acts only as a transport platform without spreading and folding the fiber webs in this step. According to this version, in the overlapping step, the expansion ie. the stretching of the fiber network can be done in a parallel or alternating (zigzag) way.

Step 709: hydro-splitting, i.e. processing the overlapped fiber webs with a water jet in the hydro-splitting device described in the above-presented Embodiment I. This step specifically involves: prewetting the fiber web during low-pressure water when introducing the fiber web into the hydro-splitting device; water-jetting the wetted fiber web in a hydro-bonding machine to dislodge and entangle the fibers on the forming layer of the second hydro-bonding machine by the action of the strong water jet and to form rectangular holes in the water-jetted fiber web; water-jetting the fiber web from its rear side with a first hydro-splitting machine and water-jetting the fiber web from its front side with a second hydro-splitting machine. According to this version, water jet treatment is adopted along the vertical direction and at a jet pressure of 40 ~ 500 bar.

Step 710: post-processing, i.e. additional processing of the product obtained after the water jet processing step to obtain a non-woven product such as gauze. Such a post-processing step may include degreasing, bleaching, softening, drying, rolling, cutting, etc...

According to Figure 14, a nonwoven product such as gauze that is produced using the previously described manufacturing process, in this embodiment, contains a nonwoven hydrobonded fabric. The hydro-bonded non-woven material has matrix-arranged rectangular holes formed by the impact of the water jet. Matrix-arranged rectangular holes are present in a flat structure with warp and weft. The dimensions of each rectangular hole are larger than the linear width of the warp and weft. The dimensions of the rectangular holes refer to the width and length of the rectangular hole. In order to achieve a better gauze effect, the line width of the warp and weft of the non-woven gauze is 0.1~1mm. Warp/weft density refers to the number of warp and weft threads per inch. Rectangular hole density refers to the number of rectangular holes per square inch. The density of rectangular holes is not less than 50 holes per square inch, for example 75 holes per square inch. In particular, the warp/weft density of a nonwoven product such as gauze can be selected as 19 x 15 per inch or 30 x 20 per inch. In the general case, the holes on the gauze sheet are made in the form of a relatively rigid rectangle. As for

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non-woven gauze described in this embodiment, the rectangular holes formed thereon are rigid rectangular holes. Therefore, non-woven gauze possesses the effect of gauze as well as the structure and characteristics of gauze. A non-woven product such as gauze, after stacking several layers of hydro-bonded non-woven material, can be used in medicine for dressing wounds.

Implementation of the second invention

According to Figure 15, this embodiment describes a system for producing a nonwoven product such as gauze, which is in accordance with the invention. The difference between this embodiment of the invention and Embodiment I according to the description is that the system according to the invention additionally includes a conveyor 807 for conveying the marking threads 804 to the folding platform 608 and placing the threads between the upper and lower webs of fibers supplied by one or more carding machines. The folding platform 608 has a press roller 801 to press the threads 804 to mark in place between the upper fiber web 805 and the lower fiber web 806 when drawing and folding the fiber webs. The transporter 807 for delivering the thread 80 for labeling can also be realized in the form of an unwinding device.

A double-roll carding machine is commonly used, which can output two layers of fiber mesh. According to some embodiments, if there is only one carding machine in the system for producing a non-woven product such as gauze, the two layers of fiber mesh obtained at the output of the carding machine are used on the folding platform as the upper fiber mesh and the lower fiber mesh. If there are two or more carding machines in the production system of a non-woven product such as gauze, the two layers of fiber mesh obtained at the output of each carding machine are firstly combined together as one layer of fiber mesh, and then as a combined fiber mesh from one or more carding machines on the folding platform is used as the lower fiber mesh, while the combined fiber mesh from other carding machines on the folding platform is used as the upper fiber mesh. According to this embodiment, there are two carding machines shown in Figure 1, where the two layers of fiber webs obtained at the output of one of them are combined together as one layer to be

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leads to the folding platform as the lower fiber network, and wherein the two layers of the fiber network obtained at the output of the second of them are combined together as one layer which is led to the folding platform as the upper fiber network.

Due to the need to ensure that the marking thread is embedded between the two layers of the fiber mesh, only a parallel mode of operation can be used on the lamination platform 608 when spreading and laminating the layers.

After the marking thread is moved under the action of the water jet during the hydro-bonding process, the marking thread will not be straight but will be bent on the nonwoven material, which will affect the performance of the subsequent cutting process. In order to make the embedded marking thread stable between the two layers of the fiber mesh and not to move, i.e. to prevent displacement of the marking thread during the hydro-bonding process, the system for producing a nonwoven product such as gauze additionally includes a coating device 802 for coating the marking thread with a layer of glue before it is installed between the upper and lower fibers of the mesh. The marking thread will adhere closely to the fiber web after being drawn by the coating device and pressed by the roller. Therefore, in the course of performing the hydro-bonding process, when the fibers are entangled and moved under the action of the water jet, the fibers that are stuck to the marking thread are moved to one side integrally due to the restriction imposed by the marking thread so that the marking thread is kept in a straight line that will not affect the appearance of the nonwoven product, as well as the subsequent cutting process. In order to apply the adhesive to the marking thread, a spraying or smearing process can be applied. Additionally, when the marking string is coated with an adhesive layer, it can only be done along predetermined segments of the thread to protect the nonwoven fabric from the action of the adhesive and thus remain soft.

When the marking thread is pressed between the top and bottom layers of the fiber web using the press roller, the marking thread may be displaced relative to the two layers of the fiber web due to mechanical equipment vibrations that may affect the straight line orientation of the marking thread. In order to ensure that the thread will remain straight after installation, a metal ring 803 is provided in front of the coating device in the system for producing a nonwoven product such as gauze. The marking thread is passed through the metal ring 803. When performing

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pressing the marking thread between the upper and lower layers of the fiber mesh with a roller, the movement of the marking thread is limited by being fixed to the metal ring 803 which ensures that the marking thread will remain straight after installation. Here there can be only one metal ring, or a series of several metal rings arranged in cascade can be performed. The metal ring can be fixed to one end of the fixed link while the other part of the fixed link can be attached to the folding platform. The end of the fixing link on the folding platform may have a rotatable structure. The position of the metal ring can be adjusted by adjusting the fixed link, thereby adjusting the path of the wire coupled to the chip (which will be described later).

After installing the marking threads on the folding platform, the combined fiber web is immediately fed to the hydro-bonding device. In order to ensure that the marking thread is represented as a straight line on the formed hydro-bonded material, the first hydro-bonding head is placed in the position that is the closest possible position to the pressure roller.

With the system for producing a nonwoven product such as gauze according to this embodiment, the marking thread can be embedded in the gauze with rectangular holes. Here, there may be only one embedded marking thread or there may be multiple embedded marking threads arranged in parallel and at a predetermined interval. When multiple marking threads are installed, a larger number of conveyors are needed to deliver the recognition threads in order to deliver a greater number of marking threads in parallel at predetermined intervals and to install them between the upper and lower fiber networks according to the predetermined interval.

By means of this embodiment and the application of the previously described system, the production process of a non-woven product such as gauze is provided in an appropriate manner. The difference between the process according to this embodiment of the invention and Embodiment 1 according to the description is that step 708 (ie, the overlapping step) additionally includes the step of embedding the marking thread between the two layers of the fiber network.

In order to make the embedded marking thread stable between the two layers of the fiber mesh and not to move, the overlapping step additionally includes a step

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coating the marking thread with glue before embedding it between the upper and lower mesh of fibers. The marking thread will bond with the fiber web after being coated with glue in the coating device and pressed by the roller. In order to apply the adhesive to the marking thread, a spraying or smearing process can be applied.

With the process for producing a nonwoven product such as gauze obtained in accordance with the invention, the marking thread can be embedded in the gauze with rectangular holes. There may be only one embedded marking thread or there may be multiple embedded marking threads arranged in parallel according to a predetermined interval. Due to the need to ensure that the marking thread is embedded in a straight line between the two layers of the fiber network, in the folding step, according to this embodiment, only a parallel method for stretching and folding the layers of the network can be applied.

According to Figure 16, this design results in a non-woven product such as gauze, which is produced using the aforementioned procedure. The difference between the product according to this embodiment of the invention and Embodiment I according to the description is that the marking thread 901 is embedded between two layers of hydro-bonded nonwoven material. The marking thread 901 is embedded between the fibers of the non-woven fabric and between its upper and lower surfaces which are covered with twisted fibers. One or more marking threads may be embedded in the material. As shown in Figure 16, label 902 represents a nonwoven layer.

The marking thread can be an X-ray detectable thread or a wire coupled to a chip that can transmit radio signals (eg radio frequency signals).

A thread that can be detected by X-rays can be a fiber coated with an X-ray absorbing material (coated, for example, with barium sulfate).

According to this embodiment, the marking thread is a wire coupled to the chip. According to Figure 17, the wire coupled to the chip contains a metal wire 903, a chip 904, a non-woven layer 905 and a thread 906 for fixing.

1

One or more chips 904 arranged according to a predetermined interval are fixed on the metal wire 903. The non-woven layer 905 is wrapped around the outside of the metal wire 903 and the chip 904. The fixing thread 906 is wrapped around the outside of the non-woven layer 905.

In order to protect a non-woven product such as gauze from the effects of the thickness of the wire coupled to the chip, the metal wire 903 is very fine and, for example, contains copper wire. Additionally, the metal wire is a continuous copper wire or is composed of a plurality of segments interconnected at their ends and made of copper wires, where each segment has at least one chip and where, when the segment has only one chip, the chip is located in the middle of the copper wire segment. The 904 chip can emit radio signals. Each chip may have a correspondingly independent serial number that can be detected by a receiver used to receive radio waves. The distance between two chips can be determined according to specific requirements, for example 29 cm. The chip is connected to a metal wire using a conductive resin so that the metal wire can act as an antenna, increasing the detection distance of the chip.

In order to ensure that the fixing thread 906 is more tightly wrapped around the outside of the nonwoven layer 905, the fixing thread 906 is combined with at least one spandex thread. The fixation thread 906 can be formed from multiple yarns, where the elastin thread is combined within the multiple yarns. The elasticity of the elastin thread is higher than the elasticity of the normal yarn, which improves the elasticity of the fixing thread and makes the wrapped thread stronger.

It was noticed that during the production process of non-woven gauze, and after installing the wire connected to the chip, that is, when cutting the hydro-bonded non-woven product such as gauze into smaller pieces, it is necessary to ensure that each piece of gauze has only one piece of wire connected to exactly one chip.

The non-woven gauze-like product described in this embodiment of the invention may be a medical gauze formed by stacking multiple layers of hydro-bonded non-woven material. If medical gauze falls into the patient's body during surgery, it can be easily found due to the built-in marking thread to avoid wrong treatment.

2

Detailed descriptions of the present invention have been given above in conjunction with specific embodiments, but it is not to be inferred that the specific implementations of the present invention are solely limited to such descriptions. Those of ordinary skill in the art may also arrive at simple conclusions or changes without departing from the concept of the present invention, which should be treated as within the scope of protection of the present invention.

Claims (12)

PATENT REQUESTS 1. The system for the production of a non-woven product such as gauze, contains: picker (601) for opening, cleaning and mixing raw cotton; a carding machine (607) located after the picker (601) for further opening and cleaning of the raw cotton and its carding to form a network (20, 100) of fibers; a folding platform (608) located after the carding machine (607) for spreading and folding the web of fibers (20, 100) according to a predetermined specification; a conveyor (807) for conveying the marking threads (804, 901) to the platform (608) for inserting the threads between the upper and lower webs (805, 806) of the fibers fed from one or more carding machines (607); where the platform (608) has a pressing roller (801) for pressing the marking threads (804, 901) delivered by the conveyor (807) to the place between the upper and lower webs (805, 806) of the fibers when stretching and overlapping the webs (20, 100) of the fibers; a hydro-bonding device (609) located after the folding platform (608) for hydro-bonding the folded webs (20, 100) of fibers; wherein the hydro-coupling device (609) comprises a first hydro-coupling machine (30) and a second hydro-coupling machine (40); wherein the first hydrobonding machine (30) comprises a first rotating drum and a first support web (312) surrounding the first drum; wherein the second hydro-joining machine (40) comprises a second rotating drum and a second support web (412) surrounding the second drum, where the second support web (412) has a shaping layer (413), where the shaping layer (413) has thereon formed pointed protrusions (414) arranged in a matrix and with a through hole (415), where each of the pointed protrusions (414) has a conical top and bottom rectangular in cross-section, wherein the size of the bottom of each of the pointed protrusions (414) is greater than the bottom distance between two adjacent pointed protrusions (414); and a post-processing device (610) located after the hydro-bonding device (609) and intended for the post-processing of the product obtained after the water jet treatment step, in order to obtain a non-woven product in the form of gauze. 2. The system of Claim 1, wherein the bottom distance between the two pointed protrusions (414) is 0.1 ~ 1 mm and wherein the density of the pointed protrusions (414) on the molding layer (413) is not less than 50 per square inch. 3. The system of claim 1, further comprising a coating device (802) for coating the marking threads (804, 901) with an adhesive layer prior to installing the marking threads (804, 901) in place between the upper and lower webs (805, 806) of the fibers. 4. A system according to Claim 3, further comprising a metal ring (803) provided before the coating device (802) to fix the marking threads (804, 901). 5. A process for the production of a non-woven product such as gauze using a system according to any of Claims 1 to 4, where the process includes: a picking step (701) to open, clean and blend the raw cotton; step (707) of carding ie. pulling to further open and clean the raw cotton and form a network (20, 100) of fibers; a folding step (708) to stretch and fold the webs (20, 100) of fibers according to the given specifications, wherein the folding step (708) further comprises: embedding a marking thread (804, 901) in place between two layers of the web (805; 806) of fibers; hydro-joining step (709) for processing the folded web (20, 100) of fibers introduced into the device (609) for hydro-joining with a water jet, where step (709) of hydro-joining specifically includes: pre-wetting the web (20, 100) of fibers with low pressure water when introducing the web (20, 100) of fibers into the inlet of the device (609); water-jetting the wetted web (20, 100) of fibers within the hydro-bonding device (609) so that the fibers on the forming layer (413) of the second hydro-bonding machine (40) are displaced and entangled by the action of the water jet, and to form a rectangular hole in the water-jetted web (20, 100) of fibers; water jetting the web (20, 100) of the fibers from the rear using a first hydro-bonding machine (30) and water jetting the web (20, 100) from the front using a second machine (40), and post-processing step (710) to further process the product obtained after performing the hydro-bonding process to obtain a non-woven product such as gauze. 6. The method according to Claim 5, where the step (708) of overlapping, before installing the threads (804, 901) in place between the two layers of the web (805, 806) of the fibers further comprises: coating the threads (804, 901) for marking with glue. 7. A nonwoven product such as gauze produced using the system according to any one of Claims 1 to 4, comprising a hydro-bonded nonwoven fabric with matrix-arranged rectangular holes formed by a water jet and where the matrix-arranged rectangular holes are performed on a flat structure with a warp and weft, and where the dimension of each rectangular hole is greater than the linear width of the warp and weft; wherein the nonwoven product such as gauze further comprises a marking thread (804, 901) embedded between the fibers of the hydrobonded nonwoven material, and wherein the upper and lower surfaces of the material are covered with braided fibers. 8. The gauze-like nonwoven product according to Claim 7, wherein the linear width of the warp and weft of the gauze-like nonwoven product is 0.1~1 mm, and wherein the density of the rectangular holes is not less than 50 per square inch. The gauze-like nonwoven product of Claim 7, wherein the marking thread (804, 901) is a thread of X-ray detectable material or a wire coupled to a chip capable of transmitting radio signals. 10. The gauze-like nonwoven product of Claim 9, wherein the wire coupled to the chip comprises: metal wire (903); one or more chips (904) arranged according to a predetermined interval and fixed to a metal wire (903); a non-woven layer (905) wrapped around a metal wire (903) and a chip (904); and a thread (906) for fixation wrapped around the nonwoven layer (905). 11. A gauze-like nonwoven product according to Claim 10, wherein the metal wire (903) is a continuous copper wire or a plurality of copper wire segments joined at their ends, and/or where the fixing thread (906) is combined with at least one elastin thread. 12. The nonwoven gauze-like product according to any one of Claims 7 to 11, wherein the nonwoven gauze-like product is medical gauze formed by stacking multiple layers of hydro-bonded nonwoven fabric. 2