CN118028811A

CN118028811A - Etching process and trawling for products without connection points

Info

Publication number: CN118028811A
Application number: CN202410333460.XA
Authority: CN
Inventors: 于谨双; 简群飞; 石圣波
Original assignee: Dalian Bonded Area Jinbaozhi Electronics Co ltd
Current assignee: Dalian Bonded Area Jinbaozhi Electronics Co ltd
Priority date: 2024-03-22
Filing date: 2024-03-22
Publication date: 2024-05-14

Abstract

The application relates to the technical field of etching processing, and particularly discloses an etching process and trawl for a product without a connecting point, comprising the following steps: etching a product by adopting a trawl, wherein the trawl comprises an upper net sheet, a lower net sheet and a guide frame, and the upper net sheet and the lower net sheet are oppositely arranged and fixed on the guide frame; the etching process includes: placing the cured developed sheet product between the upper mesh and the lower mesh; drawing the sheet-shaped product through the guide frame to etch to form a plurality of small bodies; and drawing the small individual through the guide frame to remove the film so as to remove the film on the surface. The application solves the problems of complex whole working procedure, high labor cost and high material cost, and the problem of low yield caused by easy deformation of thinner products due to the need of carrying out multiple operations on the products when etching the product without connecting points in the related technology.

Description

Etching process for product without connecting point and trawl

Technical Field

The application relates to the technical field of etching processing, in particular to an etching process and trawl for a product without a connecting point.

Background

In the small individual etching process for the product without the connection point, in order to avoid that the small individual product falls into the gap of the conveying roller when conveyed by the conveying roller after etching, the PE protective film needs to be attached to the surface of the product between etching, so that the small individual product still adheres to the PE protective film after etching and does not fall into the gap.

The conventional etching process using the PE protective film at least includes:

And (3) sticking a PE protective film once: the PE protective film is stuck on one side of the product;

etching: etching the product with the single-sided protective film by using etching solution;

primary film stripping: the bare film leakage surface is removed by film removing liquid

Sticking a secondary PE protective film; applying the PE protective film to the product after film removal for the second time, applying the bare metal leakage surface, and manually tearing off the PE protective film applied for the first time after the application;

And (3) secondary film stripping: removing the membrane surface of the bare drain by using membrane removing liquid;

Removing the PE protective film: tearing off the secondary protective film to form individual small units (finished products).

Therefore, the whole process is complex, more personnel need to participate in, the labor cost is increased, the PE protective film is a disposable product, the material use cost is increased, and the thinner product is easy to deform due to the fact that the process needs to carry out operations of coating and tearing the film for multiple times, so that the yield is lower.

Disclosure of Invention

The application mainly aims to provide an etching process for a product without connection points, which aims to solve the problems that the whole process is complex, the labor cost and the material cost are high when the product without connection points is etched in the related art, and the thinner product is easy to deform due to the fact that the product is required to be operated for many times, so that the yield is low.

In order to achieve the above object, the present application provides an etching process for a connectionless product, comprising:

Etching a product by adopting a trawl, wherein the trawl comprises an upper net sheet, a lower net sheet and a guide frame, and the upper net sheet and the lower net sheet are oppositely arranged and fixed on the guide frame;

The etching process includes:

Placing the cured developed sheet product between the upper mesh and the lower mesh;

drawing the sheet-shaped product through the guide frame to etch to form a plurality of small bodies;

and drawing the small individual through the guide frame to remove the film so as to remove the wet film on the surface.

Further, the preparation process of the trawl comprises the following steps:

selecting an upper net sheet and a lower net sheet with proper thickness and mesh diameter;

The upper net piece and the lower net piece are oppositely arranged, the periphery of the lower net piece is fixedly connected with four sides of the guide frame, and at least one opposite side of the upper net piece is fixedly connected with the guide frame;

During the etching, the sheet-like product is placed through the side of the upper mesh sheet that is not connected to the guide frame.

Further, the preparation process of the trawl further comprises the following steps: a plurality of connecting holes are formed in the inner side edge of the guide frame along the length direction of the guide frame;

The periphery of the lower net piece is connected with the connecting holes through connecting lines in a sewing mode, and at least one opposite side of the upper net piece is connected with the connecting holes through connecting lines in a sewing mode.

Further, a screen of suitable thickness and mesh size is selected, specifically:

determining the thickness of the silk screen according to the allowable passing capacity of the etching equipment and the film removing equipment and the thickness of a product to be etched, so that the trawl can normally pass through the etching equipment and the film removing equipment;

The mesh size of the silk screen is determined according to the etching capability of the etching device and the film stripping capability of the film stripping device so that the film on the surface of the small body can be removed normally.

Further, the silk screen is made of nylon.

Further, a sheet-like product is placed in the middle of the lower web.

Further, the etching process for the product without connecting points further comprises the following steps:

Drying the small individual after the film is pulled and removed through the guide frame, and taking the small individual after drying;

the next sheet-like product to be etched is placed between the upper and lower mesh sheets for product etching.

Further, the sheet-like product is produced by the steps of:

surface treatment is carried out on the raw materials;

coating the ink on the surface of the material by using a coating machine and drying tunnel equipment;

Exposing the coated material, and printing a pattern on the surface of the material;

developing the material, and displaying the non-light-receiving part and reserving the light-receiving graph part;

and drying the developed sheet material to solidify the graph to obtain the sheet product.

Further, the surface treatment is carried out on the raw materials, specifically:

carrying out oil removal, acid washing and drying surface treatment on the raw materials of the stainless steel;

exposing the coated material, and printing a pattern on the surface of the material, wherein the method comprises the following steps of:

printing a pattern on the surface of the coated material by using a resin film through irradiation of an ultraviolet lamp;

developing the material, and displaying the non-light-receiving part, and reserving the light-receiving graph part, wherein the method specifically comprises the following steps:

using sodium carbonate solution to display the non-light-receiving part and reserving the pattern part after light receiving;

before placing the cured developed sheet product on the trawl, the method further comprises selecting developed materials, and selecting defective repairing materials.

According to another aspect of the present application, there is provided a trawl for etching a connectionless product, applied to the above etching process for a connectionless product, comprising: an upper mesh, a lower mesh, and a guide frame;

The periphery of the lower net sheet is fixedly connected with four sides of the guide frame, and at least one opposite side of the upper net sheet is fixedly connected with the guide frame;

And the upper net sheet and the lower net sheet are used for placing a sheet-shaped product to be etched. In the embodiment of the application, the product is etched by adopting a trawl, wherein the trawl comprises an upper net sheet, a lower net sheet and a guide frame, and the upper net sheet and the lower net sheet are oppositely arranged and fixed on the guide frame; the etching process includes: placing the cured developed sheet product between the upper mesh and the lower mesh; drawing the sheet-shaped product through the guide frame to etch to form a plurality of small bodies; the film removing is carried out by pulling the small individual through the guide frame so as to remove the film on the surface, the conventional process steps are greatly reduced, the processing process is simplified, the production efficiency is improved, the personnel cost is reduced, meanwhile, the material use cost is reduced because a PE protective film is not required to be used in the etching process, the film pasting and tearing operations are not required in the processing process, the deformation of a product caused by multiple operations is avoided, the product yield is improved, the problems that the whole process is complex, the labor cost and the material cost are high when the product without a connecting point is etched in the related technology are solved, the thinner product is easy to deform because the product is required to be subjected to multiple operations, and the yield is low are solved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application, are incorporated in and constitute a part of this specification. The drawings and their description are illustrative of the application and are not to be construed as unduly limiting the application. In the drawings:

FIG. 1 is a schematic flow diagram according to an embodiment of the application;

FIG. 2 is a schematic illustration of a sheet product placed between an upper and lower web in accordance with an embodiment of the present application;

FIG. 3 is a schematic diagram of an embodiment of the application after etching into small entities;

FIG. 4 is a schematic side cross-sectional view of a trawl according to an embodiment of the present application;

FIG. 5 is a schematic side cross-sectional view of another installation of a trawl according to an embodiment of the application;

The device comprises a guide frame 1, a connecting groove 101, a second magnet 102, an upper net sheet 2, a lower net sheet 3, a trawl 4, a sheet-shaped product 5, a small unit 6, a connecting belt 7 and a first magnet 8.

Detailed Description

In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the application herein.

In the present application, the azimuth or positional relationship indicated by the terms "upper", "lower", "inner", and the like are based on the azimuth or positional relationship shown in the drawings. These terms are only used to better describe the present application and its embodiments and are not intended to limit the scope of the indicated devices, elements or components to the particular orientations or to configure and operate in the particular orientations.

Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in the present application will be understood by those of ordinary skill in the art according to the specific circumstances.

Furthermore, the terms "disposed," "configured," "connected," "secured," and the like are to be construed broadly. For example, "connected" may be in a fixed connection, a removable connection, or a unitary construction; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements, or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In addition, the term "plurality" shall mean two as well as more than two.

It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.

primary film stripping: the dry film surface of the bare leak is removed cleanly by the film removing liquid

and (3) secondary film stripping: removing the bare dry film surface by using film removing liquid;

Therefore, the whole process is complex, more personnel need to participate in, labor cost is increased, the PE protective film is a disposable product, material use cost is increased, and the thinner product is easy to deform due to the fact that the process needs to carry out operations of film pasting and film tearing for multiple times on the product, so that the yield is lower.

In order to solve the above technical problems, as shown in fig. 1 to 3, an embodiment of the present application provides an etching process for a product without connection points, including:

the product is etched by adopting a trawl 4, wherein the trawl 4 comprises an upper net piece 2, a lower net piece 3 and a guide frame 1, and the upper net piece 2 and the lower net piece 3 are oppositely arranged and fixed on the guide frame 1;

The etching process includes:

S10, placing the sheet-shaped product 5 after curing and developing between the upper net sheet 2 and the lower net sheet 3;

s20, dragging the sheet-shaped product 5 through the guide frame 1 to etch to form a plurality of small units 6;

s30, pulling the small individual 6 through the guide frame 1 to remove the film on the surface.

In this embodiment, the trawl 4 is used to etch the product so that the entire etching process adjusts the original at least six steps to include only three steps. Specifically, the trawl 4 mainly comprises an upper net piece 2 and a lower net piece 3 which are distributed up and down, the upper net piece 2 and the lower net piece 3 have the same structure, are silk screens and have a plurality of meshes which are uniformly distributed. In the process of being convenient for pull trawl 4 and sheet product 5 to remove in the etching, the front end of upper net piece 2 and lower net piece 3 is fixed to guide frame 1, and guide frame 1 is stereoplasm framework structure, can pull trawl 4 and sheet product 5 to remove through pulling guide frame 1. After the sheet product 5 has undergone the curing and developing process, the sheet product 5 may be placed between the upper and lower mesh sheets 2 and 3 (as shown in fig. 2). Next, the upper and lower sheets 2, 3 and the sheet 5 may be pulled by the guide frame 1 to move on the conveyor rollers, and after passing through the etching zone, the etching liquid will contact the sheet material through the mesh openings on the upper and lower sheets 2, 3, thereby etching the sheet 5 into a number of small units 6 (as shown in fig. 3). The small individual 6 formed by etching is still positioned between the upper net sheet 2 and the lower net sheet 3, so that the small individual 6 still cannot fall into the gap of the conveying roller under the wrapping and supporting effects of the upper net sheet and the lower net sheet. The film stripping operation can be directly performed after the etching is finished, and the film stripping liquid can also contact with the surfaces of the products of the small individuals 6 through the meshes of the upper net sheet 2 and the lower net sheet 3, so that the film stripping is performed on the upper surface and the lower surface of the small individuals 6 simultaneously.

Compared with the conventional PE film etching method, the PE film etching method by the trawl 4 has the advantages that firstly, film pasting and film tearing operations of the PE film are not needed in the etching process, and film stripping can be performed on the upper surface and the lower surface of the product at one time, so that the etching process is greatly shortened, the labor cost is reduced, and the production efficiency is improved; secondly, as the PE film is not needed, the material use cost is saved, and the production cost is further reduced; in addition, the number of the working procedures is reduced, so that excessive operations (such as film pasting, film tearing, film returning twice and the like) are not needed in the etching process, the probability of deformation of the product due to the action of external force is greatly reduced, and the yield of the product is improved. Finally, the problems that the whole process is complex, the labor cost and the material cost are high when the product without the connecting point is etched in the related technology are solved through the embodiment, and the thinner product is easy to deform due to the fact that the product is required to be operated for many times, so that the yield is low are solved.

Based on the actual production flow, the processing procedure is reduced by at least three steps, the number of production participants is reduced from 26 to 19, 7 persons are saved, the yield is improved from 400 tablets per day to 1000 tablets per day, the yield is improved by 2.5 times, and the yield is improved from 70% to 92%.

It should be noted that the specific shape of the small individual 6 is determined according to the unnecessary product requirement, and in one embodiment, as shown in fig. 2 and 3, the sheet-like product 5 has a square structure, and the small individual 6 also has a square structure with a small area.

In one embodiment, the trawl 4 is prepared by the process comprising:

selecting an upper net sheet 2 and a lower net sheet 3 with proper thickness and mesh diameter;

The upper net sheet 2 and the lower net sheet 3 are oppositely arranged, the periphery of the lower net sheet 3 is fixedly connected with four sides of the guide frame 1, and at least one opposite side of the upper net sheet 2 is fixedly connected with the guide frame 1;

during the etching process, the sheet-like product 5 is placed through the side of the upper web 2 that is not connected to the guide frame 1.

In this embodiment, the upper mesh sheet 2 and the lower mesh sheet 3 may be an upper portion and a lower portion of a large-area wire mesh after being folded in half, respectively. Of course, it will be appreciated that the upper mesh 2 and the lower mesh 3 may also be separate screens. When the upper mesh sheet 2 and the lower mesh sheet 3 are folded into a part for one wire mesh, when being connected with the guide frame 1, the folded edge of the wire mesh is fixedly connected with one side of the guide frame 1, and the opposite side of the folded edge can be only fixedly connected with the lower mesh sheet 3 and the guide frame 1, so that the side forms an opening structure, and the other two sides are all fixedly connected with the guide frame 1, and the sheet-shaped product 5 can be placed between the upper mesh sheet 2 and the lower mesh sheet 3 through the opening structure and taken out from the opening structure.

When the upper net sheet 2 and the lower net sheet 3 are separate silk screens, four sides of the lower net sheet 3 can be fixedly connected with the guide frame 1, three sides of the upper net sheet 2 are fixedly connected with the guide frame 1, and one side of the upper net sheet 2 which is not connected with the guide frame 1 is used as an opening structure for putting in and taking out the sheet-shaped products 5.

In this embodiment, compared with another embodiment, the embodiment of doubling up the large-area silk screen to form the upper mesh 2 and the lower mesh 3 is simpler, the processing is more convenient, and when the doubling edge of the self belt is located in the traction direction of the guide frame 1, the device can play a good limiting role on the sheet-shaped product 5, and can avoid the sheet-shaped product 5 falling out from the side in the traction process when the upper mesh 2 and the lower mesh 3 are disconnected from the guide frame 1.

In one embodiment, the process of preparing trawl 4 further comprises: a plurality of connecting holes are formed on the inner side edge of the guide frame 1 along the length direction;

the periphery of the lower net sheet 3 is connected with the connecting holes through connecting lines in a sewing way, and at least one opposite side of the upper net sheet 2 is connected with the connecting holes through connecting lines in a sewing way.

In addition, in addition to the connection of the upper and lower meshes 2,3 to the guide frame 1 by sewing, this embodiment provides another connection method for facilitating the attachment and detachment of the upper and lower meshes 2, 3.

Specifically, as shown in fig. 5, in the present embodiment, annular connecting grooves 101 are formed in the upper and lower surfaces of the guide frame 1, and the depth of the connecting grooves 101 is equal to or greater than the thickness of the upper mesh sheet 2 or the lower mesh sheet 3. A plurality of first magnets 8 are embedded in the connecting groove 101 along the length direction, an annular connecting belt 7 is fixedly connected around the upper net sheet 2 and the lower net sheet 3, the connecting belt 7 can be fixedly connected with the upper net sheet 2 and the lower net sheet 3 in an adhering or sewing mode, a plurality of second magnets 102 are arranged in the connecting belt 7 along the length direction, and the positions of the first magnets 8 and the second magnets 102 correspond to each other.

During installation, the upper net sheet 2 can be placed into the connecting groove 101 positioned on the upper surface of the guide frame 1 from the upper side of the guide frame 1, and the connecting bands 7 around the upper net sheet 2 are directly matched and adsorbed and fixed with the first magnet 8 through the second magnet 102. The mesh 3 can be installed in the connecting groove 101 on the lower surface of the guiding frame 1 from the lower side of the guiding frame 1, and the connecting belt 7 around the lower mesh 3 is directly matched and adsorbed and fixed with the first magnet 8 through the second magnet 102. When the sheet-like product 5 and the small individual 6 are taken and placed, the upper net sheet 2 can be lifted for operation.

In this embodiment, the upper mesh 2, the lower mesh 3 and the guiding frame 1 are connected by magnetic attraction, so that the upper mesh 2 and the lower mesh 3 are more convenient to mount and dismount, and the upper mesh 2 and the lower mesh 3 are easy to replace. In this embodiment, since the connecting grooves 101 are formed on the upper and lower surfaces of the guide frame 1, a protruding annular plate structure is formed around the guide frame 1, and the first magnet 8 can be embedded in the annular plate structure, so that the magnetic force generated by the first magnet can act in the connecting grooves 101 on the upper and lower surfaces at the same time. That is, in the present embodiment, the first magnet 8 generates a magnetic force of N pole in the upper connecting groove 101, and generates a magnetic force of S pole in the lower connecting groove 101. The lower end of the second magnet 102 in the connecting band 7 connected with the upper net sheet 2 is an S pole, and the upper end of the second magnet 102 in the connecting band 7 connected with the lower net sheet 3 is an N pole.

In addition, it should be noted that the depth of the connecting groove 101 is greater than the thickness of the upper mesh sheet 2 or the lower mesh sheet 3 and is greater than the thickness of the connecting belt 7 provided with the second magnet 102, so that the surface of the connecting belt 7, the upper mesh sheet 2 and the surface of the lower mesh sheet 3 do not protrude from the surface of the guide frame 1, and thus the connecting belt 7, the upper mesh sheet 2 and the lower mesh sheet 3 are not subjected to a large resistance in the traction process, and the connecting belt 7 can be prevented from being separated from the guide frame 1 in the environment convenient for installation and disassembly. In order to prevent etching liquid from adhering to the first magnet 8 and the second magnet 102, the connecting band 7 is made of a waterproof material, and after the first magnet 8 is completely embedded into the connecting groove 101, a waterproof film is attached to the surface of the connecting groove 101 and covers the surface of the first magnet 8 so as to prevent the etching liquid from contacting with the first magnet 8.

Since the sheet-like product 5 is placed between the upper and lower net sheets 2 and 3 for etching, the overall thickness thereof is thicker than that of the PE protective film attached to the sheet-like product 5, and since the liquid needs to pass through the mesh holes to be in contact with the sheet-like product 5 during etching, the thickness of the upper and lower net sheets 2 and 3 and the size of the mesh holes affect the etching process. Specifically, the thickness of the upper and lower mesh sheets 2, 3 affects the trafficability during etching and film stripping. The size of the mesh hole affects the etching effect and the stripping effect, and thus a screen with a proper thickness and mesh size needs to be selected according to product parameters and equipment parameters.

Specifically, in this embodiment, a screen of a suitable thickness and mesh size is selected, specifically:

determining the thickness of the screen according to the allowable passing capacity of the etching equipment and the film removing equipment and the thickness of the sheet-like product 5 to be etched, so that the trawl 4 can normally pass through the etching equipment and the film removing equipment; in other words, it is necessary that the combined thickness of the upper mesh 2, the sheet-like product 5 and the lower mesh 3 after the sheet-like product 5 is placed between the upper mesh 2 and the lower mesh 3 is such that the passing requirements can be satisfied;

Determining the mesh size of the silk screen according to the etching capability of the etching device and the film removing capability of the film removing device so that the film on the surface of the small body 6 can be removed normally; in other words, the mesh size needs to be such that the etching liquid and the stripping liquid can smoothly pass through the mesh and come into full contact with the sheet-like product 5. In one embodiment, the mesh is made of nylon.

Since the sheet-like product 5 is etched to form a plurality of small units 6 in a split state, the small units 6 are displaced to some extent when being conveyed by the conveying roller because the upper net sheet 2 and the lower net sheet 3 have no fixing effect on the small units 6. In this environment, in order to avoid that small individuals 6, after being displaced, fall out of the mesh, causing them to fall into the gap of the transfer roller, it is necessary to provide sufficient coverage for the upper and lower meshes 2, 3. Thus, in this embodiment, the length and width dimensions of the upper mesh sheet 2 and the lower mesh sheet 3 are both larger than the length and width dimensions of the sheet-like product 5, and the sheet-like product 5 can be placed in the middle of the lower mesh sheet 3.

After the sheet-like product 5 is etched and film removed, it is required to dry, so the etching process for the product without connection point in this embodiment further includes:

The small individual 6 after film withdrawal is pulled by the guide frame 1 for drying, and the small individual 6 is taken away after drying.

Since the trawl 4 is adopted to carry out etching processing of the product in the embodiment, the trawl 4 has reusability compared with the PE protective film, and therefore after the etching processing of the sheet-like product 5 is completed once, the trawl 4 can be reused for the next etching processing. Specifically, the next sheet-like product 5 to be etched is placed between the upper mesh sheet 2 and the lower mesh sheet 3 for product etching. The embodiment further reduces the etching processing cost of the product through the means.

In one way of preparing the sheet product 5, the sheet product 5 is prepared by:

surface treatment is carried out on the raw materials;

Applying the photosensitive ink to the surface of the material by using a coater and a drying tunnel device, wherein films are formed on the upper surface and the lower surface of the material;

the developed material is dried to solidify the pattern to obtain the sheet-like product 5.

Before placing the cured developed sheet product 5 on the trawl 4, the method further comprises selecting developed material to select defective repair.

According to another aspect of the present application, as shown in fig. 2 to 4, there is provided a trawl 4 for etching a connectionless product, which is applied to the above-mentioned etching process for a connectionless product, comprising: an upper net sheet 2, a lower net sheet 3 and a guiding frame 1; the periphery of the lower net sheet 3 is fixedly connected with four sides of the guide frame 1, and at least one opposite side of the upper net sheet 2 is fixedly connected with the guide frame 1; between the upper mesh 2 and the lower mesh 3 is placed a sheet-like product 5 to be etched.

The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An etching process for a connectionless product, comprising:

The etching process includes:

and drawing the small individual through the guide frame to remove the film so as to remove the film on the surface.

2. The etching process for a connectionless product according to claim 1, wherein the process of preparing the trawl comprises:

3. The etching process for a connectionless product according to claim 2, wherein the process of preparing the trawl further comprises: a plurality of connecting holes are formed in the inner side edge of the guide frame along the length direction of the guide frame;

4. A process according to claim 2 or 3, characterized in that a screen of suitable thickness and mesh size is chosen, in particular:

5. The etching process for a connectionless product according to claim 4, wherein the screen is made of nylon.

6. The etching process for a connectionless product according to claim 4, wherein the sheet-like product is placed in the middle of the lower web.

7. The process for etching a connectionless product according to claim 4, further comprising:

8. The etching process for a connectionless product according to claim 1, wherein the sheet-like product is made by:

surface treatment is carried out on the raw materials;

And drying the developed material to solidify the graph to obtain the sheet product.

9. The etching process for the connectionless product according to claim 8, wherein the raw material is surface treated, in particular:

10. Trawl for etching of connectionless products, applied to a process for etching connectionless products according to any one of claims 1 to 9, comprising: an upper mesh, a lower mesh, and a guide frame;

and the upper net sheet and the lower net sheet are used for placing a sheet-shaped product to be etched.