Layered operation sheet composite hot melt adhesive spraying equipment and method

Abstract

The invention discloses layered surgical drape composite hot melt adhesive spraying equipment and method, and relates to the field of layered products, the spraying equipment comprises a workbench, a plurality of mounting racks mounted at the top of the workbench, and an adhesive spraying table mounted at the top of the workbench; a spraying mechanism is arranged on the top of the glue spraying table, a connecting block is fixed to the bottom end of a spraying cylinder, and an air curtain assembly is installed at the bottom of the connecting block. The device further comprises a control system, a three-axis translation mechanism and a clamping mechanism, wherein the three-axis translation mechanism and the clamping mechanism are installed on the installation frame. According to the requirement for interlayer shearing force of the surgical drape, the glue spraying amount is dynamically adjusted, selective gradient spraying control is formed, the interface bonding force is met, meanwhile, use of hot melt glue is reduced, and therefore in large-scale batch production, the requirement for economic benefits can be met, the consistency of bonding strength is improved, and the service life of the surgical drape is prolonged. And the overall quality and performance of the surgical drape are obviously improved.

Description

Technical Field

[0001] The invention relates to the technical field of layered products, in particular to medical care, and specifically to a layered surgical drape composite hot melt adhesive spraying device and method. Background Art

[0002] In the medical field, surgical drapes are an indispensable auxiliary material in surgical operations. They are mainly used to cover the surgical area and have excellent liquid barrier properties, mechanical strength and biocompatibility to ensure the sterility of the surgical environment and prevent cross infection. Traditional surgical drapes are usually made of multiple layers of materials. Among them, PE film (polyethylene film) is used as the bottom material. It is widely used due to its good waterproofness and chemical stability. In the preparation of surgical drapes, it is necessary to use spraying equipment to spray glue on the surface of the PE film, and to compound the PE film with other functional layers (such as non-woven fabrics after the liquid absorption layer is compounded).

[0003] Traditional hot melt adhesive spraying equipment mostly adopts a homogeneous spraying mode, which makes it difficult to dynamically adjust the spraying amount according to the mechanical requirements of different areas of the surgical drape, which can easily lead to adhesive waste or insufficient local bonding strength. For example, the edge area of ​​the drape is frequently in contact with instruments or medical staff during surgery. For high-standard surgical drapes, a higher peel strength (usually ≥2.0N / cm) is required, while the core area only requires basic bonding strength. Therefore, traditional spraying equipment often can only achieve high-standard peel strength by spraying a large amount of adhesive over the entire area, or perform gradient spraying based on experience, in order to meet this requirement. However, the above method has problems such as serious adhesive waste and low spraying accuracy in large-scale batch production, which not only increases production costs, but may also lead to inconsistent bonding strength, affecting the overall quality and performance of surgical drapes.

[0004] Therefore, it is necessary to improve the deficiencies in the prior art to solve the above problems. Summary of the invention

[0005] The present invention overcomes the shortcomings of the prior art and provides a composite hot melt adhesive spraying device and method for a layered surgical drape.

[0006] To achieve the above object, the technical solution adopted by the present invention is: a composite hot melt adhesive spraying device for layered surgical drapes, comprising: a workbench, a plurality of mounting frames installed on the top of the workbench, and a glue spraying table installed on the top of the workbench for placing a PE film to be sprayed with glue; A spraying mechanism is arranged on the top of the spraying station, and the spraying mechanism comprises: a spraying barrel, a spraying head installed at the bottom of the spraying barrel, and a glue feeding head installed at the top of the spraying barrel for connecting an external glue feeding device to realize hot melt glue supply; a connecting block is fixed at the bottom of the spraying barrel, and an air curtain assembly for forming an air curtain injection glue spraying path at the bottom of the glue spraying head is installed at the bottom of the connecting block; It also includes: a control system, and a three-axis translation mechanism and a clamping mechanism installed on the mounting frame; the control system is used to use a programmable controller to achieve quantitative glue spraying according to preset spraying parameters and target peeling strength; the three-axis translation end of the three-axis translation mechanism is connected to the connecting block, which is used to drive the glue spraying head to achieve three-axis movement; the clamping mechanism is used to clamp and position the PE film on the top of the glue spraying table.

[0007] In a preferred embodiment of the present invention, the air curtain assembly includes: an annular tube arranged on the side of the glue spray head, a plurality of nozzles fixed at the bottom of the annular tube, and a fixed block fixed between the bottom of the connecting block and the top of the annular tube; a gas delivery head for connecting an external gas delivery device to realize the supply of heated gas is fixed on the side of the annular tube.

[0008] In a preferred embodiment of the present invention, the annular tube is coaxially arranged with the glue spraying head, a plurality of the jet heads are evenly distributed circumferentially at the bottom of the annular tube, and the air outlet end of the jet head is in the same direction as the glue outlet end of the glue spraying head.

[0009] In a preferred embodiment of the present invention, the clamping mechanism includes: a plurality of cylinders fixed on one side of the mounting frame, a plurality of connecting strips fixed on output ends of the plurality of cylinders, and a pressure strip fixed on the bottom of the plurality of connecting strips; the pressure strip is located on the top of the glue spraying station.

[0010] In a preferred embodiment of the present invention, the bottom of the pressure strip is provided with a silicone anti-slip pattern for ensuring that the PE film does not move in a clamped state.

[0011] In a preferred embodiment of the present invention, the three-axis translation mechanism includes: an X-axis translation assembly mounted on the mounting frame, a Y-axis translation assembly mounted at the translation end of the X-axis translation assembly, and a Z-axis translation assembly mounted at the translation end of the Y-axis translation assembly; the translation end of the Z-axis translation assembly is fixed to one side of the connecting block.

[0012] The present invention provides a spraying method of a layered surgical drape composite hot melt adhesive spraying device, comprising the following steps: S1. Determine the spraying range of the PE film surface according to the size specifications of the functional layer, and divide the spraying area into gradients; S2, inputting the preset spraying parameters and the target peeling strength of different spraying areas into the control system, and matching and outputting the spraying amount of different spraying areas; S3, clamp the PE film to be sprayed on the top of the spraying table through the clamping mechanism, and control the spray head to spray hot melt adhesive according to the division of the spraying area, the amount of glue sprayed in different spraying areas and the setting of spraying parameters through the control system, and control the three-axis translation mechanism to drive the spray head to spray gradiently along the spraying area; S4. While the hot melt adhesive is sprayed, an air curtain is formed at the bottom of the glue spray head through the air curtain assembly with an air flow pressure of 0.2-0.4 MPa and an air flow temperature of 60-80 °C, so that the hot melt adhesive is sprayed onto the PE film and confined within the range of the air curtain, thereby realizing controllable gradient spraying of the hot melt adhesive.

[0013] In a preferred embodiment of the present invention, in step S1, the spraying range of the PE film surface is the size specification of the functional layer; the spraying area includes an edge area, a transition area and a core area from the outside to the inside according to the spraying range.

[0014] In a preferred embodiment of the present invention, in the step S2, the spraying parameters include: spraying moving speed, spraying temperature and spraying height; The glue spraying amount for: ; in, is the surface energy correction factor, ; is the target peel strength; It is the inherent bonding strength of the rubber; is the velocity attenuation coefficient, ; It is the factor affecting the viscosity of the rubber compound; is the spraying moving speed; It is the natural base.

[0015] In a preferred embodiment of the present invention, in the step S3, the spraying temperature of the hot melt adhesive is 120-140°C.

[0016] The present invention solves the defects existing in the background technology and has the following beneficial effects: (1) The present invention provides a composite hot melt adhesive spraying device for layered surgical drapes. After setting the spraying parameters and target peeling strength through the control system, the control system, the spraying mechanism, the three-axis translation mechanism and the clamping mechanism can realize full-automatic hot melt adhesive spraying control, thereby ensuring the accuracy and consistency of the spraying operation in large-scale batch production, improving the intelligence level of the equipment, and facilitating the monitoring and adjustment of the production process.

[0017] (2) In the present invention, an air curtain assembly is installed at the bottom of the connecting block. When spraying glue, an air curtain can be formed at the bottom of the glue spraying head through the cooperation of the control system, the annular tube, the air supply head and the nozzle head. Then, the glue liquid can be ejected through the Bernoulli effect to restrict its diffusion range, so that it can limit the attachment path of the PE film surface, which helps to control the path and range of the hot melt adhesive, thereby improving the accuracy of glue spraying and the spraying control effect.

[0018] (3) The present invention provides a method for spraying composite hot melt adhesive on layered surgical drapes. The method dynamically adjusts the amount of adhesive sprayed according to the interlayer shear force requirements of the surgical drapes to form a selective gradient spraying control, thereby achieving the goal of satisfying the interface bonding force while reducing the use of hot melt adhesive. In response to large-scale batch production, it can not only meet the economic benefit requirements, but also improve the consistency of bonding strength, thereby significantly improving the overall quality and performance of surgical drapes. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work. Figure 1 is a three-dimensional structural diagram of a spraying device according to a preferred embodiment of the present invention; Figure 2 This is a top view of a three-dimensional structure diagram of a spraying mechanism of a preferred embodiment of the present invention; Figure 3 This is a bottom-up stereoscopic structural diagram of a spraying mechanism of a preferred embodiment of the present invention; Figure 4 is a three-dimensional structural diagram of a clamping mechanism of a preferred embodiment of the present invention; In the figure: 1. workbench; 11. mounting frame; 12. glue spraying station; 2. spraying mechanism; 21. spraying barrel; 22. glue spraying head; 23. glue delivery head; 24. connecting block; 211. annular tube; 212. jet head; 213. fixing block; 214. air delivery head; 3. cylinder; 31. connecting strip; 32. pressure strip; 4. X-axis translation assembly; 5. Y-axis translation assembly; 6. Z-axis translation assembly. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0022] In the description of the present application, it should be understood that the terms "upper", "lower", "top", "bottom", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the invention, unless otherwise specified, "multiple" means two or more.

[0023] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood by specific circumstances.

[0024] like Figure 1 and Figure 2As shown, a composite hot melt adhesive spraying device for layered surgical drapes comprises: a workbench 1, a plurality of mounting frames 11 mounted on the top of the workbench 1, and a glue spraying table 12 mounted on the top of the workbench 1 for placing a PE film to be sprayed with glue; a spraying mechanism 2 is arranged on the top of the glue spraying table 12, and the spraying mechanism 2 comprises: a spraying barrel 21, a glue spraying head 22 mounted on the bottom end of the spraying barrel 21, and a glue delivery head 23 mounted on the top end of the spraying barrel 21 for connecting an external glue delivery device to realize hot melt adhesive supply; a connecting block 2 is fixed at the bottom end of the spraying barrel 21 4. An air curtain assembly for forming an air curtain injection glue spraying path at the bottom of the glue spraying head 22 is installed at the bottom of the connecting block 24; it also includes: a control system, and a three-axis translation mechanism and a clamping mechanism installed on the mounting frame 11; the control system is used to use a programmable controller to achieve a quantitative glue spraying amount according to preset spraying parameters and target peeling strength; the three-axis translation end of the three-axis translation mechanism is connected to the connecting block 24, and is used to drive the glue spraying head 22 to achieve three-axis movement; the clamping mechanism is used to clamp and position the PE film on the top of the glue spraying table 12.

[0025] It should be noted that the control system is electrically connected to the control module of the three-axis translation mechanism, the control module of the external glue delivery equipment, the control module of the external gas delivery equipment and the control module of the cylinder 3 respectively; the control method of the control system and the control circuit for realizing full-automatic spraying belong to the prior art and can be realized by programming by technical personnel in this field. It is common knowledge in this field. Therefore, this application no longer explains the control method and module in detail, and no detailed description is made here.

[0026] Specifically, the workbench 1 provides a stable support platform for the entire equipment. After the PE film to be sprayed is clamped and positioned on the top of the spray table 12 by the clamping mechanism, one end of the glue delivery head 23 is connected to the external glue delivery equipment through a pipeline. After the spraying parameters and the target peeling strength are set by the control system, the hot melt adhesive is controlled to be transported into the spray barrel 21. After entering the spray barrel 21, it is sprayed out from the glue spray head 22 under the action of pressure. At the same time, the air curtain assembly is controlled to form an air curtain injection spraying path, and the three-axis translation mechanism is used to spray according to the gradient path, thereby realizing fully automatic hot melt adhesive spraying control, thereby ensuring the accuracy and consistency of the spraying operation in large-scale batch production, improving the intelligence level of the equipment, and facilitating the monitoring and adjustment of the production process.

[0027] like Figure 3 As shown, in some embodiments, the air curtain assembly includes: an annular tube 211 arranged on the side of the glue spray head 22, a plurality of nozzles 212 fixed at the bottom of the annular tube 211, and a fixed block 213 fixed between the bottom of the connecting block 24 and the top of the annular tube 211; a gas supply head 214 for connecting an external gas supply device to realize the supply of heated gas is fixed on the side of the annular tube 211.

[0028] It should be noted that the annular tube 211 is coaxially arranged with the glue spraying head 22 , and a plurality of air jets 212 are evenly distributed circumferentially at the bottom of the annular tube 211 , and the air outlet end of the air jets 212 is in the same direction as the glue outlet end of the glue spraying head 22 .

[0029] Specifically, an external gas delivery device is connected through the gas delivery head 214 on the side of the annular tube 211. When spraying glue, the heated gas can be delivered to the annular tube 211 through the gas delivery head 214, and the heated gas can be sprayed out from the multiple nozzles 212 at the bottom of the annular tube 211. Since the gas outlet end of the nozzle 212 is in the same direction as the glue outlet end of the glue spraying head 22, and the multiple nozzles 212 are evenly distributed circumferentially at the bottom of the annular tube 211, an air curtain can be formed at the bottom of the glue spraying head 22, and then the glue liquid can be ejected through the Bernoulli effect to restrict its diffusion range, so that it can limit the attachment path of the PE film surface, which helps to control the path and range of the hot melt adhesive, thereby improving the accuracy of glue spraying and the spraying control effect.

[0030] like Figure 4 As shown, in some embodiments, the clamping mechanism includes: a plurality of cylinders 3 fixed on one side of the mounting frame 11, a plurality of connecting strips 31 fixed on the output ends of the plurality of cylinders 3, and a pressure strip 32 fixed on the bottom of the plurality of connecting strips 31; the pressure strip 32 is located on the top of the glue spraying station 12.

[0031] It should be noted that the bottom of the pressure strip 32 is provided with silicone anti-slip patterns for ensuring that the PE film is not displaced in the clamping state, which can increase the friction coefficient of the contact surface with the PE film and produce microscopic bite during clamping to prevent the PE film from being displaced due to the air curtain airflow or the inertia of the spray movement.

[0032] Specifically, after the PE film to be sprayed with glue is placed on the top of the glue spraying station 12, the output end of the control cylinder 3 is fed toward the surface of the glue spraying station 12, which can drive the connecting strip 31 to move downward, and the pressure strip 32 can move downward with the movement of the connecting strip 31, so that the PE film can be clamped and positioned on the top of the glue spraying station 12. At the same time, the silicone anti-slip pattern arranged on the bottom of the pressure strip 32 can increase the friction between the pressure strip 32 and the PE film, ensuring that the PE film is not displaced in the clamped state, thereby ensuring the accuracy of the glue spraying operation.

[0033] like Figure 1 As shown, in some embodiments, the three-axis translation mechanism includes: an X-axis translation assembly 4 mounted on a mounting frame 11, a Y-axis translation assembly 5 mounted at the translation end of the X-axis translation assembly 4, and a Z-axis translation assembly 6 mounted at the translation end of the Y-axis translation assembly 5; the translation end of the Z-axis translation assembly 6 is fixed to one side of the connecting block 24.

[0034] It should be noted that the driving principles of the X-axis translation assembly 4, the Y-axis translation assembly 5 and the Z-axis translation assembly 6 are the same, and all include at least: a support plate for connecting and supporting, a power source (such as a servo motor) for providing rotational power, a transmission assembly (such as a ball screw and a limit rod) for converting the rotational power into linear motion, and a translation member (such as a translation plate or a translation rod) driven for translation. The specific structure is a mechanical structure in the prior art that can convert rotational motion into linear motion, which is common knowledge in the field. Therefore, this application will no longer explain the control method and structure in detail, and will not be elaborated on here.

[0035] Specifically, the control system controls the X-axis translation assembly, the Y-axis translation assembly and the Z-axis translation assembly to perform coordinated movement of the corresponding glue spraying paths, and can drive the glue spraying head to achieve three-axis movement, thereby performing a full range of glue spraying operations on the PE film on the glue spraying table.

[0036] The present invention provides a spraying method of a layered surgical drape composite hot melt adhesive spraying device, comprising the following steps: S1. Determine the spraying range of the PE film surface according to the size specifications of the functional layer, and divide the spraying area into gradients; S2, inputting the preset spraying parameters and the target peeling strength of different spraying areas into the control system, and matching and outputting the spraying amount of different spraying areas; S3, clamping and positioning the PE film to be sprayed on the top of the spraying station 12 through the clamping mechanism, and controlling the spraying head 22 to spray the hot melt adhesive according to the division of the spraying area, the amount of spraying in different spraying areas and the setting of spraying parameters through the control system, and controlling the three-axis translation mechanism to drive the spraying head 22 to perform gradient spraying along the spraying area; S4. While the hot melt adhesive is sprayed, an air curtain is formed at the bottom of the glue spraying head 22 through the air curtain assembly with an air flow pressure of 0.2-0.4 MPa and an air flow temperature of 60-80°C, so that the hot melt adhesive is sprayed onto the PE film and is confined within the range of the air curtain, thereby realizing controllable gradient spraying of the hot melt adhesive.

[0037] In some specific embodiments, in step S1, the spraying range of the PE film surface is the size specification of the functional layer; the spraying area includes an edge area, a transition area and a core area from the outside to the inside according to the spraying range.

[0038] In some specific embodiments, in step S2, the spraying parameters include: spraying movement speed, spraying temperature and spraying height; Glue spraying amount for: ; in, is the surface energy correction factor (fitted by PE film peeling experiment), ; is the target peel strength; It is the inherent bonding strength of the rubber; is the velocity attenuation coefficient (dynamic calibration of glue droplet diffusion by high-speed camera tracking), ; It is the factor affecting the viscosity of the rubber compound (test of the rheological properties of the rubber compound); is the spraying moving speed; is the natural base (2.71828).

[0039] It should be noted that the spraying parameters and the target peeling strength of different spraying areas need to be normalized before being input into the control system to ensure that the data are on the same scale. The normalization process is to scale the data so that it falls into a small specific interval to eliminate the influence of the dimension on the result. The calculation formula is: ; in, It is the original data; is the normalized data.

[0040] In some specific implementations, in step S3, the spraying temperature of the hot melt adhesive is 120-140°C.

[0041] In order to further make the purpose and effect of the present invention simple and easy to understand, the present invention is further described in conjunction with embodiments.

[0042] The spraying parameter settings in this embodiment are shown in Table 1.

[0043] Table 1: Spraying parameters

[0044] Furthermore, the edge area, transition area and core area are divided in turn according to the spraying range, and the spraying path is planned: Edge area: Area range: The spraying range is from outside to inside, forming a 20 cm wide circular edge area; the starting position of the outer circle: 0 cm from the edge of the spraying range, and 2 circles of spiral spraying inward, with a spacing of 5 cm between each circle (covering a width of 20 cm); Transition zone: Area range: From the outside to the inside of the edge area, a 30 cm wide round transition zone is formed; the starting position of the outer circle: 0 cm from the edge of the edge area, 3 circles of spiral spraying inward, with a spacing of 5 cm between each circle (covering a width of 30 cm); Core area: Area range: The transition area range extends inward to form a rectangular core area of ​​20cm×70cm; The starting position of the outer circle: 0cm from the edge of the transition area range, spray in 2 sections in a serpentine path from one side to the other, with a spacing of 5cm between each section (covering a 20cm width).

[0045] The glue spraying amount set in the edge area, transition area and core area is calculated in turn by the target peel strength, where: , , , , (9m / min=0.15m / s): Fringe Area: ; Transition Zone: ; Core area: .

[0046] Through the spraying equipment, according to the set spraying parameters, gradient spraying area division and corresponding spraying amount, the hot melt adhesive can be sprayed in a controlled gradient, and the functional layer is bonded to the spraying range on the surface of the PE film to perform data verification: Verification 1: Rubber consumption Calculate the area and glue consumption of different spraying areas: Core area: The size of the core area is 20cm×70cm, and the coverage area is: , the rubber consumption is: ; Transition zone coverage area: The transition zone has a circular size of 50cm×100cm. , the rubber consumption is: ; Edge area coverage: The circular size of the edge area is 70cm×120cm. , the rubber consumption is: ; The total glue consumption is 110.9g, compared with the traditional homogeneous spraying (full-area spraying according to the edge area dosage), the traditional total glue consumption is 123.13g, and thus the gradient spraying of the present invention saves about 9.93% of the glue consumption compared with the traditional full-area spraying.

[0047] Verification 2: Actual peel strength test Referring to GB / T 2792-2014 “Test method for peel strength of adhesive tape”, the test was performed three times in parallel and the average value was taken. The results are shown in Table 2.

[0048] Table 2: Peel strength test results

[0049] As shown in Table 2, the deviation between the actual peel strength and the target value is ≤0.6%, the algorithm reliability is up to standard, and it meets the peel strength standard of high-standard surgical drapes.

[0050] In summary, the present invention dynamically adjusts the amount of glue sprayed according to the interlayer shear force requirements of the surgical drape to form a selective gradient spray control, thereby achieving the goal of satisfying the interface bonding force while reducing the use of hot melt adhesive. Therefore, in response to large-scale batch production, it can not only meet the economic benefit requirements, but also improve the consistency of bonding strength, and significantly improve the overall quality and performance of the surgical drape.

[0051] The above is based on the ideal embodiment of the present invention. Through the above description, it is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0052] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A composite hot melt adhesive spraying device for layered surgical drapes, characterized in that: include: A workbench, a plurality of mounting frames mounted on the top of the workbench, and a glue spraying table mounted on the top of the workbench for placing a PE film to be sprayed with glue; A spraying mechanism is arranged on the top of the spraying station, and the spraying mechanism comprises: a spraying barrel, a spraying head installed at the bottom of the spraying barrel, and a glue feeding head installed at the top of the spraying barrel for connecting an external glue feeding device to realize hot melt glue supply; a connecting block is fixed at the bottom of the spraying barrel, and an air curtain assembly for forming an air curtain injection glue spraying path at the bottom of the glue spraying head is installed at the bottom of the connecting block; It also includes: a control system, and a three-axis translation mechanism and a clamping mechanism installed on the mounting frame; the control system is used to use a programmable controller to achieve quantitative glue spraying according to preset spraying parameters and target peeling strength; the three-axis translation end of the three-axis translation mechanism is connected to the connecting block, which is used to drive the glue spraying head to achieve three-axis movement; the clamping mechanism is used to clamp and position the PE film on the top of the glue spraying table.

2. The composite hot melt adhesive spraying device for layered surgical drapes according to claim 1, characterized in that: The air curtain assembly includes: an annular tube arranged on the side of the glue spray head, a plurality of nozzles fixed at the bottom of the annular tube, and a fixed block fixed between the bottom of the connecting block and the top of the annular tube; a gas delivery head for connecting an external gas delivery device to realize the supply of heated gas is fixed on the side of the annular tube.

3. The composite hot melt adhesive spraying device for layered surgical drapes according to claim 2, characterized in that: The annular tube is coaxially arranged with the glue spraying head, a plurality of the jet heads are evenly distributed circumferentially at the bottom of the annular tube, and the air outlet end of the jet head is in the same direction as the glue outlet end of the glue spraying head.

4. The composite hot melt adhesive spraying device for layered surgical drapes according to claim 1, characterized in that: The clamping mechanism comprises: a plurality of cylinders fixed on one side of the mounting frame, a plurality of connecting strips fixed on the output ends of the cylinders, and a pressure strip fixed on the bottom of the connecting strips; the pressure strip is located on the top of the glue spraying station.

5. The composite hot melt adhesive spraying device for layered surgical drapes according to claim 4, characterized in that: The bottom of the pressure strip is provided with a silicone anti-slip pattern for ensuring that the PE film does not move in a clamped state.

6. The composite hot melt adhesive spraying device for layered surgical drapes according to claim 1, characterized in that: The three-axis translation mechanism includes: an X-axis translation assembly installed on the mounting frame, a Y-axis translation assembly installed at the translation end of the X-axis translation assembly, and a Z-axis translation assembly installed at the translation end of the Y-axis translation assembly; the translation end of the Z-axis translation assembly is fixed to one side of the connecting block.

7. A spraying method for a layered surgical drape composite hot melt adhesive spraying device based on any one of claims 1-6, characterized in that: The following steps are involved: S1. Determine the spraying range of the PE film surface according to the size specifications of the functional layer, and divide the spraying area into gradients; S2, inputting the preset spraying parameters and the target peeling strength of different spraying areas into the control system, and matching and outputting the spraying amount of different spraying areas; S3, clamp the PE film to be sprayed on the top of the spraying table through the clamping mechanism, and control the spray head to spray hot melt adhesive according to the division of the spraying area, the amount of glue sprayed in different spraying areas and the setting of spraying parameters through the control system, and control the three-axis translation mechanism to drive the spray head to spray gradiently along the spraying area; S4. While the hot melt adhesive is sprayed, an air curtain is formed at the bottom of the glue spray head through the air curtain assembly with an air flow pressure of 0.2-0.4 MPa and an air flow temperature of 60-80 °C, so that the hot melt adhesive is sprayed onto the PE film and confined within the range of the air curtain, thereby realizing controllable gradient spraying of the hot melt adhesive.

8. The method for spraying a layered surgical drape composite hot melt adhesive spraying device according to claim 7, characterized in that: In the step S1, the spraying range of the PE film surface is the size specification of the functional layer; the spraying area includes an edge area, a transition area and a core area from the outside to the inside according to the spraying range.

9. The method for spraying a layered surgical drape composite hot melt adhesive spraying device according to claim 7, characterized in that: In the step S2, the spraying parameters include: spraying moving speed, spraying temperature and spraying height; The glue spraying amount for: ; in, is the surface energy correction factor, ; is the target peel strength; It is the inherent bonding strength of the rubber; is the velocity attenuation coefficient, ; It is the factor affecting the viscosity of the rubber compound; is the spraying moving speed; It is the natural base.

10. The method for spraying a layered surgical drape composite hot melt adhesive spraying device according to claim 7, characterized in that: In the step S3, the spraying temperature of the hot melt adhesive is 120-140°C.

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