CN109108470B

CN109108470B - Laser ablation dust removal method and device for metal tank and metal tank

Info

Publication number: CN109108470B
Application number: CN201810617752.0A
Authority: CN
Inventors: 丁加斌; 李亚勇; 杨湘玲
Original assignee: Shenzhen Everwin Precision Technology Co Ltd
Current assignee: Shenzhen Everwin Precision Technology Co Ltd
Priority date: 2018-06-14
Filing date: 2018-06-14
Publication date: 2021-08-24
Anticipated expiration: 2038-06-14
Also published as: CN109108470A

Abstract

The utility model provides a metal can laser ablation dust collector, is including being located the laser head of metal can top, arranging in the metal can fill in the body, the metal can include the tank bottoms, certainly tank bottoms upwards extend the can body, the jar mouth that forms, will the jar body top claps seals and is used for holding the jar body of article, the external diameter of filling in the body equals the internal diameter of the jar body is in order to seal jar internal space, the laser head ablation seal the dust that produces by fill in the body and prevent and can not pollute the internal portion of jar. The application also includes a metal can laser ablation method and a metal can.

Description

Laser ablation dust removal method and device for metal tank and metal tank

Technical Field

The application relates to the field of metal processing, in particular to a metal tank laser ablation dust removal method and device and a metal tank.

Background

The development of social economy greatly enriches the substances of people, and the pursuit of human beings on life and the pursuit of substance taste are continuously improved. Generally, people adopt plastic bottles, metal bottles and other modes to contain food and the like, and then realize sealing through internal sealing bags or bottle caps and other modes.

In the market, tea leaves are respectively contained in small packages in a metal can and then sealed on a seal of a can opening through a food-grade aluminum film for sealing. Therefore, people can take small doses conveniently, and the storage time is longer. In the technology, the combination of the metal and the aluminum film has certain problems, and the tank opening sealing can be loosened and air leakage can be caused. In order to solve the binding force problem, a laser ablation process needs to be carried out on the seal, but in the ablation process, dust is easily generated and falls into the metal can, the quality of food is affected, and the quality problem of the food is caused.

Disclosure of Invention

In view of the above, it is desirable to provide a method and an apparatus for removing dust from a metal can by laser ablation, and a metal can with the method and apparatus, wherein the dust does not contaminate the internal space of the metal can during the laser ablation process of the metal can.

For solving above-mentioned technical problem, the application provides a metal can laser ablation dust collector, including being located the laser head of metal can top, arranging in the metal can fill in the body, the metal can include the tank bottoms, certainly tank bottoms upwards extend the can body, jar mouth that form, will the jar body top claps seals and is used for holding the jar body of article, the external diameter of filling in the body equals the internal diameter of the jar body is in order to seal the internal space of jar, the laser head ablation seal the dust that produces by fill in the body and prevent and can not pollute the internal portion of jar.

Preferably, the laser ablation dust removal device for the metal can further comprises an air suction device arranged above the seal and an air blowing device used for blowing air to the ablation position of the seal.

Preferably, the metal can is arranged on the workbench, the laser head emits laser to irradiate on the sealing surface of the metal can, and the laser head and the sealing surface move relatively.

Preferably, the laser irradiates the sealing surface 1 to 2 times.

Preferably, the laser power is between 80 and 120W, the speed is 8000-9000mm/min, and the frequency is 15 to 25 Khz.

Preferably, the power of the laser is 98W, the speed is 8500mm/min, and the frequency is 20 Khz.

Preferably, the metal can is static on the workbench, the laser head moves along the surface of the seal in a circular motion mode, and the air blowing device moves along the position of the seal and the laser ablation position.

Preferably, the laser head emits laser light statically, and the metal can is driven by the workbench to do circular motion.

Preferably, the laser head and the metal can are relatively moved in a circumferential direction of the closure.

Preferably, the periphery of the top end of the plugging body is sleeved with a sealing ring, and the sealing ring is sealed with the inner side surface of the tank body.

In order to solve the technical problem, the application also provides a metal can laser ablation dust removal method, and the metal can laser ablation device is adopted to process the metal can.

In order to solve the technical problem, the application also provides a metal can which is obtained by processing the metal can laser ablation device.

This application seals at the metallic tank and when carrying out radium carving ablation, sets up one and fills in the internal body of filling in of jar, fill in the body seal the jar body prevents the dust pollution jar body.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application.

Fig. 1 to 4 are schematic views of a metal surface treatment method, a metal can, and a metal can aluminum film combination according to the present application:

FIG. 1 is a perspective view of a metal can of the present application;

FIG. 2 is a cross-sectional view of a metal can of the present application;

FIG. 3 is a 100-fold scanning electron microscope image of the sealed surface of the metal can before laser irradiation;

fig. 4 is a 100-fold scanning electron microscope image of the sealing surface of the metal can before laser irradiation.

Fig. 1, 2 to 12 are schematic diagrams of the laser ablation dust removal method or device for metal can sealing of the present application:

FIG. 5 is a schematic view of a first embodiment of a laser ablation dust removal method for a metal can closure according to the present application;

FIGS. 6 to 8 are schematic views of a second embodiment of the laser ablation dust removal method for metal can sealing according to the present application;

FIGS. 9 to 12 are schematic views of a third embodiment of the laser ablation dust removal method for metal can sealing according to the present application;

fig. 13 and 14 are side-view graphs of the aluminum film drawing force of the metal can closure of the present application under laser ablation and without laser ablation, respectively.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the field of food packaging, an aluminum can is commonly used as a food storage carrier, an opening of the aluminum can is generally required to be sealed, an aluminum film with an adhesive is generally adopted for sealing, and the bonding force between the sealing surface of the aluminum can and the aluminum film is not strong enough and needs to be improved.

Referring to fig. 1 and 2, a metal can 10 of the present application includes a can bottom 11, a can body 12 extending upward from the can bottom 11, a can opening 13, a closure 14 for closing the top of the can body 12, and a can body 16 for containing an article. The top surface of the closure 14 has a certain width for bonding with an aluminum film (not shown), and an inner concave portion 15 is formed at the lower portion of the closure 14 such that the outer edge of the closure 14 is flush with the side surface of the can body 12.

The metal surface treatment method of the present application is to treat the surface of the seal 14 of the metal can 10 to enhance the bonding force between the seal 14 and the aluminum film. The metal can 10 is made of aluminum or aluminum alloy.

The metal surface treatment method comprises the following steps:

s01, processing CD lines on the metal surface;

the metal is preferably aluminum or aluminum alloy metal, and the interval of the CD grains is between 200 and 300 mu m. Preferably, the CD stripes are spaced between 240-260 um.

In particular, when applied to the metal can 10, the step is to machine CD lines on the surface of the closure 14.

S02, carrying out anodic oxidation treatment on the metal surface;

in the first embodiment, the step is to form a plurality of irregular micropore structures on the metal surface by corrosion when the metal surface is anodized, and the pore diameter of the micropores is between 20-100 um;

in the second embodiment, the step is to perform chemical etching treatment before or after the anodic oxidation treatment to enlarge the micropore structure, wherein the pore diameter of the micropore is between 20 and 100 um;

the concave parts and the convex parts of the CD grains are both provided with the micropores.

The anodization and etching processes in this step can be found in several prior arts, such as the disclosures of application numbers 201210043634.6, 201410213862.2, 201410213855.2, etc., and are not described herein again.

In this step, after the metal surface is anodized, a pore sealing film may be generated on the surface, and the pore sealing film may cause the microporous structure to be closed or become small, as shown in fig. 3, at this time, under the scanning of an electron microscope, the metal surface is relatively flat, and all micropores are covered.

S03, carrying out ablation treatment on the metal surface by using laser;

in the step, the hole sealing film is removed by laser ablation, so that the micropores are exposed on the metal surface. The metal surface treated in this step is shown in fig. 4, and the microporous structure and the CD lines are clearly visible.

In this step, the metal surface to be ablated is irradiated with laser for 1 to 2 times, the laser power is between 80 and 120W, the speed is 8000-9000mm/min, the frequency is 15 to 25Khz, and preferably, the laser power is 98W, the speed is 8500mm/min, and the frequency is 20 Khz.

Comparing fig. 3 and fig. 4, after the laser ablation is completed in this step, the CD lines and the micro-porous structures on the metal surface are clearly visible, and the hole sealing film on the metal surface is removed.

S04, welding an aluminum film on the metal surface ablated by the laser so that the aluminum film is stably combined on the metal surface;

in the step, the adhesive side of the aluminum film with the adhesive is melted at high temperature, the melted adhesive permeates into the concave parts of the CD grains and the plurality of micropores, and the aluminum film is firmly fixed on the metal surface after the adhesive is cooled.

Specifically, it means that the aluminum film is firmly adhered to the closure 14 of the metal can 10.

The utility model provides a metal surface treatment mainly used handles 14 surfaces of sealing of metal can 10, handles the back of accomplishing, the inside food of depositing of metal can, like tealeaves etc. then contain the aluminium membrane fusion welding of bond line in one side on 14 surfaces of sealing, the adhesive of bond line infiltrates after melting between the CD line and in the micropore after the adhesive cools off, make the aluminium membrane with 14 surface cohesion greatly increased seal.

As shown in table 1 below (in N): after the five groups of products with the serial number 1 are subjected to laser ablation treatment, the aluminum film is welded on the seal 14 in a fusion mode; five groups of products with the serial number 2 are not subjected to laser ablation treatment, and an aluminum film is directly welded on the seal 14 in a fusion mode; the same group of products with the

serial numbers

1 and 2 is the same batch of products, namely the two products in the first group are the same batch of products (except for laser ablation, the other processing technologies are consistent), the two products in the second group are the same batch of products, and so on, the two products in the third group, the fourth group and the fifth group are the same batch of products respectively.

Fig. 13 is a drawing force side view graph of five groups of products numbered 1, and fig. 14 is a drawing force side view graph of five groups of products numbered 2:

as can be seen from fig. 13, fig. 14 and table 1: the maximum drawing force and the minimum drawing force of the product subjected to laser ablation treatment are obviously greater than those of the product not subjected to laser ablation treatment, the stability in the drawing process is better, the middle part of the drawing force curve shown in FIG. 13 is more stable, the drawing forces are balanced, and no fluctuation occurs; the middle part of the drawing force curve shown in fig. 14 has obvious sawtooth fluctuation, which shows that the drawing force fluctuates during the drawing process, and the hand feeling is not good.

Serial number	Specification of	First group	Second group	Third group	Fourth group	Fifth group
							1	Processed by S03	18.82-4.90	19.01-3.14	17.44-4.7	20.38-5.29	18.23-5.0
2	Not treated with S03	16.86-3.72	18.03-2.74	16.66-4.51	17.64-0.98	16.46-4.70

TABLE 1

According to experimental data, after the step S03, the bonding force between the aluminum film and the surface of the seal 14 is significantly improved.

According to the metal surface treatment method, the metal can and the metal can aluminum film combination, CD grains are formed on the metal surface through machining, the specific surface area of the metal surface is increased, micropores are formed on the metal surface through processes such as anodic oxidation, finally, the CD grains and the micropores are exposed out of the metal surface through a hole sealing film generated by laser ablation anodic oxidation, and then the aluminum film is welded on the metal surface in a high-temperature mode, so that the binding force between the aluminum film and the metal surface is greatly improved.

The treatment method can be applied to other metal products needing to be welded with the aluminum film besides the metal can.

In step S03, when the method is applied to food cans, dust is generated at the position where the seal 14 is ablated, and the dust enters the metal can 10 without being processed, and the interior of the metal can 10 is used for storing food, which may cause harm to human body. Several methods and devices for performing dust removal in step S03 are described below:

example 1

Referring to fig. 5, the laser ablation dust removing apparatus for metal cans of the present embodiment includes a metal can 10, a laser head 20 located above the metal can 10, an air suction device 30, and an air blowing device 40.

The air suction device 30 is a large horn-shaped structure and is arranged on one side of the seal 10 of the metal can 10 for high-power air suction.

The metal can 10 is placed on a worktable, and the laser head 20 emits laser light to irradiate the surface of the seal 14 of the metal can 10 and move relative to the seal 14.

In the laser irradiation process, the surface of the seal 14 is ablated by laser to generate dust, at this time, the air blowing device 40 starts air blowing, and the air blowing device 40 is specifically an air pipe to blow air at the laser irradiation position of the seal to blow away the dust.

Specifically, the laser irradiates the surface of the seal 14 for 1 to 2 times, the laser power is between 80 and 120W, the speed is 8000-9000mm/min, the frequency is 15 to 25Khz, and preferably, the laser power is 98W, the speed is 8500mm/min, and the frequency is 20 Khz.

The air blowing device 40 extends into the tank 16, air is blown from the radial direction of the metal tank 10 away from the central axis direction to keep away dust so as to prevent the dust from falling into the tank 16, and the dust away from the tank 16 is sucked by the air suction device 30 so as to improve the workshop environment and prevent the secondary pollution to the tank 16.

The relative movement between the laser and the closure 14 may be as follows:

firstly, the metal can 10 is static on a workbench, the laser head 20 makes circular motion along the sealing surface, and the blowing device 40 moves along with the sealing 14 and the laser ablation position;

secondly, the laser head 20 emits laser statically, the metal can 10 is driven by the workbench to do circular motion, and the moving speed is the same as that of the laser head;

third, the laser head 20 and the metal can 10 are moved relatively in the circumferential direction of the seal 14 at the above-mentioned moving speed.

Example 2

Referring to fig. 6 to 8, the laser ablation dust removing device for metal cans of the present embodiment includes a metal can 10, a laser head 20 located above the metal can 10, a plug 50 disposed in the metal can 10, an air blowing device 40, and an air suction device 30.

The air suction device 30 is a large horn-shaped structure and is arranged on one side of the seal 10 of the metal can 10 for high-power air suction. In this embodiment, the suction device 30 may not be provided, and the suction device 30 is an unnecessary feature in this embodiment, but the installation of the suction device 30 to suck dust out of the plant may improve the environment of the plant and improve the production safety. The blowing device 30 is also an unnecessary feature in this embodiment, but in order to achieve better technical effects, the blowing device 30 can promote the dust to be blown away and sucked and collected by the suction device 30.

The plug body 50 is a cylindrical structure to adapt to the shape of the can body 16, and the plug body 50 includes a main body 51, an air inlet 52 vertically penetrating the main body 51, and an operating handle (not shown) disposed on the top surface of the main body 51.

The outer diameter of the plugging body 50 is smaller than the inner diameter of the minimum position of the tank body 16, so that a uniform gap h is left between the plugging body 50 and the inner side surface of the minimum position of the tank body 16 in the circumferential direction.

When the metal can is in use, the plug-in body 50 is arranged in the can body 16, the plug-in body 50 is coaxial with the metal can 10, a gap h is kept between the edge of the plug-in body 50 and the inner side of the can body 12, and the plug-in body 50 is not contacted with the can bottom 11 by depending on the operating handle, so that a space m is left between the bottom of the plug-in body 50 and the can bottom 11. The relative position of the inserted body 50 and the metal can 10 is fixed after the insertion.

As shown in fig. 7, laser head 20 is used for emitting laser to irradiate the surface of the seal 14 and move with each other, the surface of the seal 14 is ablated to generate dust, at this time, high-pressure gas is pressed into the air inlet 52 of the plug body 50, passes through the space m between the plug body 50 and the tank bottom 11 along the air inlet 52, finally comes out through the gap h between the plug body 50 and the metal tank 10, and forms high-pressure air flow at the outlet of the gap h, so that the dust generated by ablation of the laser at the seal 14 is prevented from entering the tank body 16, and the generated dust is blown away by matching with the blowing device 40. In specific implementation, a plurality of support feet (not shown) can be arranged at the bottom of the plug body 50, so that the plug body 50 directly contacts the can bottom 11 to better realize the positioning between the plug body 50 and the metal can 10.

As shown in fig. 8, in practical implementation, the bottom of the plug body 50 can directly contact with the can bottom 11, and a plurality of vent holes 53 communicating with the gas inlet holes 52 are opened in the radial direction of the plug body 50, so that high-pressure gas enters the gap h between the plug body 50 and the metal can 10 from the gas inlet holes 52 through the vent holes 53.

The recess 15 at a location below the seal 14 forms an inclined surface 17 (as shown in fig. 2) on the inside wall of the can body 12, which inclined surface 17 helps to enhance the flow rate and guiding of the high pressure gas stream, which blows out at the narrowest point of the gap h and creates a stream of gas radially outward along the surface of the seal 14.

Example 3

Referring to fig. 9 to 12, the laser ablation dust removing apparatus for metal cans of the present embodiment includes a metal can 10, a laser head 20 located above the metal can 10, a plug 50 disposed in the metal can 10, an air blowing device 40, and an air suction device 30.

The plug 50 is a cylindrical structure to accommodate the shape of the can body 16. The outer diameter of the plug-in body 50 is equal to the inner diameter of the concave part 15 of the metal can 10, so that the plug-in body 50 just closes the can opening 13;

in one embodiment, a sealing ring 55 is sleeved on the plug body 50 at a position corresponding to the concave part 15, and the top surface of the plug body 50 is flush with the surface of the seal 14 so as not to affect the air suction of the air suction device 30;

in an embodiment, a sealing ring 55 is sleeved on the plug body 50 corresponding to the concave portion 15, the top surface of the plug body 50 is higher than the surface of the seal 14, and the outer diameter of the plug body 50 may be smaller than the outer diameter of the concave portion 15.

The plug body 50 in this embodiment is not provided with an air inlet, and the rest is the same as embodiment 2, and the description thereof is omitted.

In summary, the plug body 50 of

embodiments

2 and 3 is preferably made of metal, and the seal ring 55 of embodiment 3 needs to be made of high temperature resistant material.

It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to 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 scope of the claims of the present application.

Claims

1. The laser ablation dust removal device for the metal can is characterized by comprising a laser head positioned above the metal can and a plug body arranged in the metal can, wherein the metal can comprises a can bottom, a can body formed by upwards extending from the can bottom, a can opening, a seal for flatly beating the top end of the can body and a can body for containing articles, the outer diameter of the plug body is equal to the inner diameter of the can body so as to seal the inner space of the can body, and dust generated by ablation of the laser head on the seal is prevented by the plug body and cannot pollute the inner part of the can body;

the periphery of the top end of the plug body is sleeved with a sealing ring, and the sealing ring is sealed with the inner side surface of the tank body;

processing and forming CD grains on the sealed metal surface, forming micropores on the metal surface through an anodic oxidation process, and then ablating a hole sealing film generated by anodic oxidation through laser to expose the CD grains and the micropores on the metal surface so as to improve the bonding force between the aluminum film and the metal surface.

2. The laser ablation dust collector for metal cans according to claim 1, further comprising a suction device disposed above the seal and a blowing device for blowing air to the ablation position of the seal.

3. The laser ablation dust collector for metal cans of claim 1, wherein the metal cans are placed on a workbench, the laser head emits laser light to irradiate the sealing surface of the metal cans, and the laser head and the sealing surface move relatively.

4. The laser ablation dust collector for metal cans according to claim 3, wherein the laser irradiates the surface of the seal for 1 to 2 times.

5. The laser ablation dust removal device for metal cans as claimed in claim 4, wherein the laser power is 80-120W, the speed is 8000-9000mm/min, and the frequency is 15-25 Khz.

6. The laser ablation dust collector for metal cans according to claim 5, wherein the power of the laser is 98W, the speed is 8500mm/min, and the frequency is 20 Khz.

7. The laser ablation dust collector for metal cans of claim 3, wherein the metal cans are stationary on a worktable, the laser head moves circularly along the surface of the seal, and the blowing device moves along the seal and the laser ablation position.

8. The laser ablation dust collector for metal cans according to claim 3, wherein the laser head emits laser light statically, and the metal cans are driven by the workbench to do circular motion.

9. The laser ablation dust collector for metal cans of claim 3, wherein said laser head and said metal cans are relatively moved in the circumferential direction of said seal.

10. A method for removing dust from metal cans by laser ablation, which is characterized in that the metal cans are processed by the laser ablation dust removing device for the metal cans as claimed in any one of claims 1 to 9.

11. A metal can, characterized in that it is obtained by processing with a laser ablation dust removal device according to any of claims 1 to 9.