A laminar surgical drape composite hot melt adhesive spraying device and method

Abstract

The present invention discloses a layered surgical drape composite hot melt adhesive spraying device and method, which relates to the field of layered products. The spraying device includes: a workbench, a plurality of mounting brackets installed on the top of the workbench, and a glue spraying table installed on the top of the workbench; a spraying mechanism is arranged on the top of the glue spraying table, a connecting block is fixed at the bottom end of the spraying cylinder, and an air curtain assembly is installed at the bottom of the connecting block; it further includes: a control system, and a three-axis translation mechanism and a clamping mechanism installed on the mounting brackets; by dynamically adjusting the glue spraying amount according to the interlayer shear force requirement of the surgical drape, a selective gradient spraying control is formed, so as to meet the interface bonding force while reducing the use of hot melt adhesive, thereby in response to large-scale mass production, not only can the economic benefit requirement be met, but also the consistency of the bonding strength can be improved, and the overall quality and performance of the surgical drape can be significantly improved.

Description

Technical Field

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

[0002] In the medical field, surgical drapes are important auxiliary materials indispensable in surgical operations. They are mainly used to cover the surgical area and have excellent liquid barrier properties, mechanical strength, and biocompatibility to ensure a sterile surgical environment and prevent cross-infection. Traditional surgical drapes are usually composed of multiple layers of materials. Among them, the PE film (polyethylene film) is used as the bottom layer material and is widely used due to its good waterproofness and chemical stability. In the preparation of surgical drapes, a spraying device is required to spray glue on the surface of the PE film and then laminate the PE film with other functional layers (such as non-woven fabric after being laminated with a liquid-absorbing layer).

[0003] Traditional hot melt adhesive spraying devices mostly adopt a homogeneous spraying mode and are difficult to dynamically adjust the spraying amount according to the mechanical requirements of different areas of surgical drapes, which easily leads to waste of glue or insufficient local bonding strength. For example, in the edge area of the drape, due to frequent contact with instruments or medical staff operations during the operation, for high-standard surgical drapes, a higher peel strength (usually ≥2.0 N / cm) is required, while only basic adhesion is needed in the core area. Therefore, in order for traditional spraying devices to meet this requirement, they often can only spray a large amount of glue in the whole area to achieve a high-standard peel strength, or spray glue in gradients according to experience. However, the above methods have serious problems such as serious waste of adhesives and low spraying accuracy in large-scale mass production, which not only increases production costs but also may 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 deficiencies of the prior art and provides a laminated surgical drape composite hot melt adhesive spraying device and method.

[0006] To achieve the above object, the technical solution adopted by the present invention is: a laminated surgical drape composite hot melt adhesive spraying device, including: a workbench, a plurality of mounting brackets installed on the top of the workbench, and a spraying table installed on the top of the workbench for placing the PE film to be sprayed with glue;

[0007] A spraying mechanism is provided at the top of the glue spraying table. The spraying mechanism includes: a spraying cylinder, a glue spraying head installed at the bottom end of the spraying cylinder, and a glue feeding head installed at the top end of the spraying cylinder for externally connecting a glue feeding device to supply hot melt glue; a connecting block is fixed at the bottom end of the spraying cylinder, and an air curtain assembly for forming an air curtain ejection glue spraying path at the bottom of the glue spraying head is installed at the bottom of the connecting block;

[0008] It further includes: a control system, a three-axis translation mechanism and a clamping mechanism installed on the mounting frame; the control system is used to spray a quantitative amount of glue by using a programmable controller according to preset spraying parameters and a target peeling strength; the three-axis translation ends of the three-axis translation mechanism are connected to the connecting block for driving the glue spraying head to perform three-axis movement; the clamping mechanism is used to clamp and position the PE film on the top of the glue spraying table.

[0009] In a preferred embodiment of the present invention, the air curtain assembly includes: an annular tube arranged on the side of the glue spraying head, a plurality of air jet heads fixed at the bottom of the annular tube, and a fixing block fixed between the bottom of the connecting block and the top of the annular tube; an air supply head for externally connecting an air supply device to supply heated gas is fixed on the side of the annular tube.

[0010] In a preferred embodiment of the present invention, the annular tube is coaxially arranged with the glue spraying head, a plurality of the air jet heads are circumferentially and evenly distributed at the bottom of the annular tube, and the air outlet ends of the air jet heads are in the same direction as the glue outlet end of the glue spraying head.

[0011] 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 bars fixed at the output ends of the plurality of cylinders, and a pressing bar fixed at the bottom of the plurality of connecting bars; the pressing bar is located on the top of the glue spraying table.

[0012] In a preferred embodiment of the present invention, a silica gel anti-slip pattern for ensuring no displacement of the PE film in the clamped state is provided at the bottom of the pressing bar.

[0013] In a preferred embodiment of the present invention, the three-axis translation mechanism includes: an X-axis translation component installed on the mounting frame, a Y-axis translation component installed at the translation end of the X-axis translation component, and a Z-axis translation component installed at the translation end of the Y-axis translation component; the translation end of the Z-axis translation component is fixed to one side of the connecting block.

[0014] The present invention provides a spraying method for a layered surgical drape composite hot melt glue spraying device, including the following steps:

[0015] S1. Determine the spraying range on the surface of the PE film according to the size specification of the functional layer, and divide the gradient spraying area;

[0016] S2. Input the preset spraying parameters and the target peel strength of different spraying areas into the control system, and match and output the amount of adhesive sprayed in different spraying areas;

[0017] S3. Through the clamping mechanism, clamp and position the PE film to be sprayed with adhesive on the top of the glue spraying table, and through the control system, according to the division of the spraying area, the amount of adhesive sprayed in different spraying areas, and the setting of the spraying parameters, control the glue spraying head to spray hot melt adhesive, and control the three-axis translation mechanism to drive the glue spraying head to perform gradient spraying along the spraying area;

[0018] S4. While spraying the hot melt adhesive, 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, form an air curtain ejection glue spraying path at the bottom of the glue spraying head, so that when the hot melt adhesive is sprayed onto the PE film, it is restricted within the air curtain range, realizing controllable gradient spraying of the hot melt adhesive.

[0019] In a preferred embodiment of the present invention, in the step of S1, the spraying range on the surface of the PE film is the size specification of the functional layer; the spraying area sequentially includes an edge area, a transition area, and a core area from the outside to the inside according to the spraying range.

[0020] In a preferred embodiment of the present invention, in the step of S2, the spraying parameters include: spraying moving speed, spraying temperature, and spraying height;

[0021] The amount of adhesive sprayed is: ;

[0022] Wherein, is the surface energy correction factor, ; is the target peel strength; is the inherent bonding strength of the adhesive; is the speed decay coefficient, ; is the adhesive viscosity influence factor; is the spraying moving speed; is the natural base.

[0023] In a preferred embodiment of the present invention, in the step of S3, the spraying temperature of the hot melt adhesive spraying is 120 - 140 °C.

[0024] The present invention solves the defects in the background technology, and the present invention has the following beneficial effects:

[0025] (1)The present invention provides a spraying device for laminated surgical drapes with hot melt adhesive. After setting the spraying parameters and target peel strength through the control system, through the cooperation of the control system, spraying mechanism, three-axis translation mechanism, and clamping mechanism, full-automatic hot melt adhesive spraying control can be achieved, thereby ensuring the accuracy and consistency of spraying operations in large-scale mass production, improving the intelligent level of the device, and facilitating the monitoring and adjustment of the production process.

[0026] (2)In the present invention, by installing an air curtain assembly at the bottom of the connecting block, during glue spraying, through the cooperation of the control system, annular pipe, air delivery head, and air jet head, an air curtain can be formed at the bottom of the glue spraying head. Furthermore, through the Bernoulli effect, the glue liquid can be ejected, restricting its diffusion range, enabling the attachment path on the surface of the PE film to be limited, helping to control the path and range of the hot melt adhesive, and thus improving the accuracy of glue spraying and the spraying control effect.

[0027] (3)The present invention provides a method for spraying hot melt adhesive on laminated surgical drapes. By dynamically adjusting the glue spraying amount according to the interlayer shear force requirements of the surgical drapes, selective gradient spraying control is formed, thereby meeting the interface bonding force while reducing the use of hot melt adhesive. Thus, in large-scale mass production, not only can the economic benefit requirements be met, but also the consistency of the bonding strength can be improved, significantly enhancing the overall quality and performance of the surgical drapes. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings;

[0029] Figure 1 is a three-dimensional structure diagram of the spraying device of the preferred embodiment of the present invention;

[0030] Figure 2 is a top three-dimensional structure diagram of the spraying mechanism of the preferred embodiment of the present invention;

[0031] Figure 3 is a bottom three-dimensional structure diagram of the spraying mechanism of the preferred embodiment of the present invention;

[0032] Figure 4 is a three-dimensional structure diagram of the clamping mechanism of the preferred embodiment of the present invention;

[0033] In the figure: 1. Workbench; 11. Mounting frame; 12. Glue spraying table; 2. Spraying mechanism; 21. Spraying cylinder; 22. Glue spraying head; 23. Glue conveying head; 24. Connecting block; 211. Annular pipe; 212. Air jet head; 213. Fixed block; 214. Air conveying head; 3. Cylinder; 31. Connecting bar; 32. Pressing bar; 4. X-axis translation assembly; 5. Y-axis translation assembly; 6. Z-axis translation assembly. Detailed implementation manner

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0035] In the following description, many specific details are set forth in order to fully understand the present invention. However, 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 by the specific embodiments disclosed below.

[0036] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is 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 should not be construed as limiting the protection scope 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 the indicated technical features. Therefore, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0037] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood through specific situations.

[0038] Such as Figure 1 and Figure 2As shown in the figure, a layered surgical drape composite hot melt adhesive spraying device includes: a workbench 1, a plurality of mounting brackets 11 installed on the top of the workbench 1, and a spraying table 12 installed on the top of the workbench 1 for placing the PE film to be sprayed with adhesive; a spraying mechanism 2 is arranged on the top of the spraying table 12, and the spraying mechanism 2 includes: a spraying cylinder 21, a glue spraying head 22 installed at the bottom end of the spraying cylinder 21, and a glue feeding head 23 installed at the top end of the spraying cylinder 21 for externally connecting a glue conveying device to realize the supply of hot melt adhesive; a connecting block 24 is fixed at the bottom end of the spraying cylinder 21, and an air curtain assembly for forming an air curtain ejection 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 bracket 11; the control system is used to realize the spraying of a quantitative glue spraying amount according to preset spraying parameters and target peel strength by using a programmable controller; the three-axis translation end of the three-axis translation mechanism is connected to the connecting block 24 for driving the glue spraying head 22 to perform three-axis movement; the clamping mechanism is used to clamp and position the PE film on the top of the spraying table 12.

[0039] 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 externally connected glue conveying device, the control module of the externally connected air conveying device, 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 those skilled in the art, which is common knowledge in this field. Therefore, the application will not explain the control method and module in detail here and will not elaborate on it.

[0040] Specifically, the workbench 1 provides a stable support platform for the entire device. After the clamping mechanism clamps and positions the PE film to be sprayed with adhesive on the top of the spraying table 12, one end of the glue feeding head 23 is externally connected to a glue conveying device through a pipeline. After setting the spraying parameters and target peel strength through the control system, the hot melt adhesive is controlled to be conveyed into the spraying cylinder 21. After entering the spraying cylinder 21, it is ejected from the glue spraying head 22 under the action of pressure. At the same time, the air curtain assembly is controlled to form an air curtain ejection glue spraying path, and the three-axis translation mechanism is used to spray according to a gradient path, so as to realize full-automatic hot melt adhesive spraying control, thereby ensuring the accuracy and consistency of the spraying operation in the face of large-scale batch production, improving the intelligent level of the device, and facilitating the monitoring and adjustment of the production process.

[0041] As Figure 3 shown, in some embodiments, the air curtain assembly includes: an annular pipe 211 arranged on the side of the glue spraying head 22, a plurality of air jet heads 212 fixed at the bottom of the annular pipe 211, and a fixing block 213 fixed between the bottom of the connecting block 24 and the top of the annular pipe 211; an air conveying head 214 for externally connecting an air conveying device to realize the supply of heated gas is fixed on the side of the annular pipe 211.

[0042] It should be noted that the annular tube 211 is coaxially arranged with the glue spraying head 22, and a plurality of air jet heads 212 are circumferentially and evenly distributed at the bottom of the annular tube 211, and the air outlet ends of the air jet heads 212 are in the same direction as the glue outlet end of the glue spraying head 22.

[0043] Specifically, an air supply device is externally connected to the annular tube 211 through an air supply head 214 on the side of the annular tube 211. When spraying glue, the heated gas can be transported into the annular tube 211 through the air supply head 214. The heated gas can be ejected from a plurality of air jet heads 212 at the bottom of the annular tube 211. Since the air outlet ends of the air jet heads 212 are in the same direction as the glue outlet end of the glue spraying head 22, and a plurality of air jet heads 212 are circumferentially and evenly distributed at the bottom of the annular tube 211, an air curtain can be formed at the bottom of the glue spraying head 22. Then, through the Bernoulli effect, the glue liquid can be entrained to restrict its diffusion range, so that the attachment path on the surface of the PE film can be limited, which helps to control the path and range of the hot melt adhesive, and thus can improve the accuracy of glue spraying and the spraying control effect.

[0044] As Figure 4 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 bars 31 fixed on the output ends of the plurality of cylinders 3, and a pressing bar 32 fixed on the bottoms of the plurality of connecting bars 31; the pressing bar 32 is located on the top of the glue spraying table 12.

[0045] It should be noted that the bottom of the pressing bar 32 is provided with silica gel anti-slip lines for ensuring that the PE film has no displacement in the clamped state, which can increase the friction coefficient of the contact surface with the PE film and generate microscopic interlocking during clamping to prevent the PE film from displacing due to the air curtain airflow or the inertia of the spraying movement.

[0046] Specifically, after placing the PE film to be sprayed with glue on the top of the glue spraying table 12, control the output end of the cylinder 3 to feed towards the surface of the glue spraying table 12, which can drive the connecting bar 31 to move downward. The pressing bar 32 can move downward along with the movement of the connecting bar 31, and then the PE film can be clamped and positioned on the top of the glue spraying table 12. At the same time, the silica gel anti-slip lines provided at the bottom of the pressing bar 32 can increase the friction force with the PE film to ensure that the PE film has no displacement in the clamped state and guarantee the accuracy of the glue spraying operation.

[0047] As Figure 1 shown, in some embodiments, the three-axis translation mechanism includes: an X-axis translation component 4 installed on the mounting frame 11, a Y-axis translation component 5 installed at the translation end of the X-axis translation component 4, and a Z-axis translation component 6 installed at the translation end of the Y-axis translation component 5; the translation end of the Z-axis translation component 6 is fixed to one side of the connecting block 24.

[0048] It should be noted that the driving principles of the X-axis translation component 4, the Y-axis translation component 5, and the Z-axis translation component 6 are the same, and each of them at least includes: a support plate for connection and support, a power source for providing rotational power (such as a servo motor), a transmission component for converting rotational power into linear motion (such as a ball screw and a limit rod), and a translation part driven to translate (such as a translation plate or a translation rod). The specific structure is a mechanical structure in the prior art that can convert rotational motion into linear motion, which belongs to the common knowledge in this field. Therefore, the control method and structure will not be explained in detail in this application and will not be elaborated here.

[0049] Specifically, by controlling the X-axis translation component, the Y-axis translation component, and the Z-axis translation component through the control system to perform coordinated motion along the corresponding glue spraying paths, the glue spraying head can be driven to achieve three-axis movement, so as to perform all-round glue spraying operations on the PE film on the glue spraying table.

[0050] The present invention provides a spraying method for a layered surgical drape composite hot melt adhesive spraying device, including the following steps:

[0051] S1. According to the size specifications of the functional layer, determine the spraying range on the surface of the PE film, and divide the gradient spraying area;

[0052] S2. Input the preset spraying parameters and the target peel strength of different spraying areas into the control system, and match and output the glue spraying amounts of different spraying areas;

[0053] S3. Through the clamping mechanism, clamp and position the PE film to be sprayed with glue on the top of the glue spraying table 12, and through the control system, according to the division of the spraying area, the glue spraying amounts of different spraying areas, and the setting of the spraying parameters, control the glue spraying head 22 to perform hot melt adhesive spraying, and control the three-axis translation mechanism to drive the glue spraying head 22 to perform gradient spraying along the spraying area;

[0054] S4. While performing hot melt adhesive spraying, through the air curtain component, form an air curtain injection glue spraying path at the bottom of the glue spraying head 22 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 restricted within the air curtain range during the spraying onto the PE film, realizing controllable gradient spraying of the hot melt adhesive.

[0055] In some specific embodiments, in the step of S1, the spraying range on the surface of the PE film is the size specifications of the functional layer; the spraying area sequentially includes an edge area, a transition area, and a core area from the outside to the inside according to the spraying range.

[0056] In some specific embodiments, in the step of S2, the spraying parameters include: spraying moving speed, spraying temperature, and spraying height;

[0057] Glue spraying amount is: ;

[0058] Among them, is the surface energy correction factor (fitted through the PE film peeling experiment), ; is the target peeling strength; is the inherent adhesion strength of the adhesive; is the velocity decay coefficient (calibrated by tracking the dynamic diffusion of the adhesive droplet with high-speed photography), ; is the influence factor of the adhesive viscosity (test of the rheological properties of the adhesive); is the spraying moving speed; is the natural base (2.71828).

[0059] It should be noted that before the spraying parameters and the target peeling strength of different spraying areas are input into the control system, they need to be normalized to ensure that the data is on the same scale. The specific normalization process is to scale the data proportionally so that it falls into a small specific interval to eliminate the influence of the dimension on the result. The calculation formula is: ;

[0060] Among them, is the original data; is the normalized data.

[0061] In some specific embodiments, in the step of S3, the spraying temperature of the hot melt adhesive spraying is 120 - 140 °C.

[0062] To further make the purpose and effect of the present invention simple and easy to understand, the present invention will be further elaborated in combination with embodiments.

[0063] In this embodiment, the setting of the spraying parameter items is shown in Table 1.

[0064] Table 1: Spraying parameter items

[0065]

[0066] Furthermore, according to the spraying range, the edge area, the transition area and the core area are divided in sequence, and the spraying path is planned:

[0067] Edge area: Area range: From the outside to the inside of the spraying range, a 20 cm wide circular edge area is formed; Outer circle starting position: 0 cm from the edge of the spraying range, and spray inwards in a spiral for 2 circles, with a spacing of 5 cm per circle (covering a width of 20 cm);

[0068] Transition area: Area range: From the outside to the inside of the edge area range, a 30 cm wide circular transition area is formed; Outer circle starting position: 0 cm from the edge of the edge area range, and spray inwards in a spiral for 3 circles, with a spacing of 5 cm per circle (covering a width of 30 cm);

[0069] Core area: Area range: The allowance inward from the transition area range forms a rectangular core area of 20 cm × 70 cm; Outer ring starting position: 0 cm from the edge of the transition area range, spray 2 segments in a serpentine path from one side to the other side, with a spacing of 5 cm for each segment (covering a width of 20 cm).

[0070] Calculate the set glue spraying amounts for the edge area, transition area, and core area according to the target peel strength. Among them, , , , , (9 m / min = 0.15 m / s):

[0071] Edge area: ;

[0072] Transition area: ;

[0073] Core area: .

[0074] Through the spraying equipment, according to the set spraying parameter items, gradient spraying area division, and corresponding glue spraying amounts, realize the controllable gradient spraying of hot melt adhesive, and conduct data verification on the spraying range where the functional layer is adhesively bonded to the surface of the PE film:

[0075] Verification 1: Glue consumption

[0076] Calculate the areas and glue consumptions of different spraying areas:

[0077] Core area: The size specification of the core area is 20 cm × 70 cm, and the covered area is: , and the glue consumption is: ;

[0078] Covered area of the transition area: The rectangular size specification of the transition area is 50 cm × 100 cm, , and the glue consumption is: ;

[0079] Covered area of the edge area: The rectangular size specification of the edge area is 70 cm × 120 cm, , and the glue consumption is: ;

[0080] The total glue consumption is 110.9 g. Compared with traditional homogeneous spraying (spraying the whole area according to the amount used in the edge area), the traditional total glue consumption is 123.13 g. Therefore, the gradient spraying of the present invention saves about 9.93% of the glue consumption compared with traditional whole-area spraying.

[0081] Verification 2: Actual peel strength test

[0082] Referring to GB / T 2792-2014 "Test Method for Peel Strength of Adhesive Tape", the test was carried out in parallel 3 times and the average value was taken. The results are shown in Table 2.

[0083] Table 2: Test Results of Peel Strength

[0084]

[0085] As shown in Table 2, the deviation between the actual peel strength and the target value is ≤0.6%, the reliability of the algorithm meets the standard, and the peel strength standard of high-standard surgical drapes is satisfied.

[0086] In summary, according to the interlayer shear force requirements of the surgical drape, the present invention dynamically adjusts the amount of sprayed adhesive to form selective gradient spraying control, so as to meet the interfacial bonding force while reducing the use of hot-melt adhesive. Therefore, in response to large-scale mass production, it can not only meet the economic benefit requirements, but also improve the consistency of the bonding strength, and significantly improve the overall quality and performance of the surgical drape.

[0087] Based on the ideal embodiments of the present invention as an inspiration, through the above description, for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, in any regard, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0088] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A laminar surgical drape composite hot melt adhesive spraying device, characterized in that, Including: A workbench, a plurality of mounting brackets installed on the top of the workbench, and a glue spraying table installed on the top of the workbench for placing the PE film to be glue-sprayed; A spraying mechanism is provided on the top of the glue spraying table. The spraying mechanism includes: a spraying cylinder, a glue spraying head installed at the bottom end of the spraying cylinder, and a glue conveying head installed at the top end of the spraying cylinder for externally connecting a glue conveying device to realize the supply of hot melt glue; a connecting block is fixed at the bottom end of the spraying cylinder, 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 bracket; the control system is used to realize the spraying of a quantitative glue spraying amount by using a programmable controller according to preset spraying parameters and a target peel strength; the three-axis translation ends of the three-axis translation mechanism are connected to the connecting block for driving the glue spraying head to perform three-axis movement; the clamping mechanism is used to clamp and position the PE film on the top of the glue spraying table; The spraying parameters include: spraying moving speed, spraying temperature and spraying height; The amount of spray adhesive is as follows: ; Among them, is the surface energy correction factor, ; is the target peel strength; is the inherent adhesive strength of the rubber compound; is the speed attenuation coefficient, ; is the rubber compound viscosity influence factor; is the spraying moving speed.

2. The laminar surgical drape composite hot melt adhesive spraying device according to claim 1, wherein: The air curtain assembly includes: an annular tube arranged on the side of the glue spraying head, a plurality of air jet heads fixed at the bottom of the annular tube, and a fixing block fixed between the bottom of the connecting block and the top of the annular tube; an air conveying head for externally connecting an air conveying device to realize the supply of heated gas is fixed on the side of the annular tube.

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

4. A layered surgical drape composite hot melt adhesive spraying device according to claim 1, characterized in that: The clamping mechanism includes: a plurality of cylinders fixed on one side of the mounting bracket, a plurality of connecting bars fixed at the output ends of the plurality of cylinders, and a pressing bar fixed at the bottom of the plurality of connecting bars; the pressing bar is located on the top of the glue spraying table.

5. The laminar surgical drape composite hot melt adhesive spraying device according to claim 4, characterized in that: Silica gel anti-slip patterns are provided at the bottom of the pressing bar to ensure that the PE film has no displacement in the clamped state.

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

7. A spraying method of a spraying device for a laminated surgical drape composite hot melt adhesive according to any one of claims 1-6, characterized in that, Including the following steps: S1. According to the size specification of the functional layer, determine the spraying range on the surface of the PE film and divide the gradient spraying area; S2. Input the preset spraying parameters and the target peel strength of different spraying areas into the control system to match and output the glue spraying amounts of different spraying areas; S3. Through the clamping mechanism, clamp and position the PE film to be glue-sprayed on the top of the glue spraying table, and through the control system, according to the division of the spraying area, the glue spraying amounts of different spraying areas and the setting of the spraying parameters, control the glue spraying head to perform hot melt glue spraying, and control the three-axis translation mechanism to drive the glue spraying head to perform gradient spraying along the spraying area; S4. While spraying the hot melt adhesive, 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, an air curtain entrainment spraying path is formed at the bottom of the spraying nozzle, so that when the hot melt adhesive is sprayed onto the PE film, it is restricted within the air curtain range, realizing controllable gradient spraying of the hot melt adhesive.

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

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

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