WO2022047946A1

WO2022047946A1 - Coating process

Info

Publication number: WO2022047946A1
Application number: PCT/CN2020/123848
Authority: WO
Inventors: 贾孟
Original assignee: 昆山鑫美源电子科技有限公司
Priority date: 2020-09-05
Filing date: 2020-10-27
Publication date: 2022-03-10
Also published as: CN112048700A

Abstract

A coating process, comprising the following steps: step I, pre-treating an original film; step II, subjecting same to priming evaporation, installing the film material treated in step I in a vacuum evaporation equipment, feeding a metal wire to an evaporation boat in the vacuum evaporation equipment, and subjecting the film material to at least one vacuum evaporation process; step III, subjecting same to evaporation, increasing the speed at which the metal wire is fed to the evaporation boat, and subjecting the film material treated in step II to vacuum evaporation again; and step IV, rolling same. Step I comprises the following operations: S1, metal oxide coating, involving: installing the original film on a vacuum evaporation equipment, feeding a metal wire to the vacuum evaporation equipment and introducing oxygen thereto, and adjusting the wire feeding speed followed by subjecting the original film to vacuum evaporation; and S2, film drying, involving: drying the film material treated in S1 to remove the moisture on the surface of the film. According to the coating process, damage to the surface of a plastic thin film due to an excessively high temperature during the vacuum evaporation process can be avoided, which is beneficial for improving the pass rate of the coating.

Description

a coating process

technical field

The invention relates to the technical field of coating, in particular to a coating process.

Background technique

Aluminized film is a composite flexible packaging material formed by coating a very thin layer of metal aluminum on the surface of a plastic film by a special process. The metal aluminum is melted and evaporated, so that the vapor of aluminum is deposited on the surface of the plastic film, so that the surface of the plastic film has a metallic luster. Because it has both the characteristics of plastic film and metal, it is a cheap and beautiful film material with excellent performance and strong practicability.

However, when using the existing vacuum coating process to coat the metal film on the surface of the plastic film, due to the poor heat resistance of the plastic film, the plastic film is easily heated during the vacuum coating process. Makes the material scrapped, the pass rate is low and so on.

SUMMARY OF THE INVENTION

In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present invention is to provide a coating process, which can avoid damage to the surface of the plastic film due to excessive temperature during the vacuum evaporation process, and is conducive to improving the coating qualification rate.

The object of the present invention is achieved through the following technical solutions:

A coating process, comprising the steps of:

Step 1: Pretreatment of the original film;

Step 2, primer evaporation, install the film material processed in step 1 into the vacuum evaporation equipment, send metal wires to the evaporation boat in the vacuum evaporation equipment, and perform vacuum evaporation on the film material at least once;

Step 3: Evaporating, increasing the speed of feeding the metal wire to the evaporation boat, and performing vacuum evaporation on the film material processed in Step 2 again;

Step 4: Roll up.

Due to the thin film material and poor heat resistance, excessive metal particles deposited on the surface of the film material at one time will cause the film surface to be seriously heated, which is likely to cause deformation of the film surface or film breakage, resulting in product scrapping. Therefore, the present invention By first evaporating the film at a lower wire feeding speed, less metal particles are deposited on the surface of the film at a time, thereby reducing heat radiation. After the film surface has enough reflective layers and heat-resistant layers , and then increase the wire feeding speed to increase the single deposition amount of metal particles on the surface of the film material. Because the heat resistance of the film material after primer evaporation becomes better, and the film material is still less prone to thermal deformation after increasing the single deposition amount Case. Increasing the single deposition amount can not only improve the coating efficiency, but on the other hand, if you always use a low deposition amount for evaporation, it will cause the problems of increased oxide layer and increased resistivity, resulting in the product unable to meet the needs of customers.

Specifically, during winding, with the thickening of the coating and the change of the physical properties of the film, it is necessary to properly adjust the tension and the angle of the bending roll to flatten the film surface, so as to avoid wrinkles on the film surface and the failure of the film material.

Wherein, the step 1 includes the following operations:

S1. Coating aluminum oxide film, installing the original film into the vacuum evaporation equipment, feeding metal wire to the vacuum evaporation equipment and filling with oxygen, adjusting the wire feeding speed and performing vacuum evaporation on the original film;

S2, drying the film, drying the film material treated by S1 to remove the moisture on the surface of the film material.

In the present invention, the production of aluminum oxide film is beneficial to improve the adhesion between the subsequent coating layer and the film material, and the water on the surface of the film material is removed by baking the film to ensure that no excess water reacts with the evaporated aluminum layer to cause the subsequent coating layer. The adhesion between the coating and the film becomes poor, which is beneficial to improve the bonding firmness between the coating and the film.

Among them, the wire feeding speed in S1 is 150-850mm/min.

Among them, when the aluminum oxide film is deposited in S1, the vacuum degree in the vacuum evaporation equipment is 0.001-0.002mbar, and the power of the evaporation boat is 6000-7000W to start the vacuum evaporation of the original film.

Among them, when baking the film in S2, the vacuum degree of the film baking equipment is 0.001-0.003 mbar, and the film drying starts when the current of the evaporation boat reaches 80%-90%.

Wherein, the wire feeding speed during the primer evaporation is 300-450mm/min. By adopting the wire feeding speed of 300-450mm/min, the coating can be improved while ensuring that the film material will not be deformed due to severe heating. effectiveness.

Wherein, the vacuum degree of the vacuum evaporation equipment is 0.001-0.002mbar during the primer evaporation, and the vacuum evaporation starts when the voltage of the evaporation boat is 9.3-9.5V.

Wherein, the speed of feeding the metal wire during the vapor deposition in the third step is 450-550mm/min. By increasing the wire feeding speed to 450-550mm/min, the coating efficiency is high, and it is beneficial to reduce the oxide layer, reduce the resistivity, and also It can ensure that the membrane material will not be deformed by heat.

Wherein, during the evaporation in the third step, the vacuum degree of the vacuum evaporation equipment is 0.001-0.002 mbar, and the voltage of the evaporation boat is 9.3-9.5V to start the vacuum evaporation.

Wherein, the metal wire is aluminum wire.

Wherein, the original film is a PET film or a CPP film.

Wherein, the vacuum evaporation times in the second step are 1-5 times.

Wherein, the vacuum evaporation times in the third step are 1-20 times.

Wherein, the temperature during vacuum evaporation in the first step, the second step and the third step is 1200-1600°C.

Among them, the film material obtained in step 4 is also included in slitting, scraper detection and packaging and storage.

Since the metal material by vapor deposition and sputtering may cause protrusions on the surface of the film, by rolling and testing the cut film with a scraper, the protrusions can be flattened or scraped off to avoid the protrusions when the product arrives at the customer. The problem caused the film to fail.

Among them, when the vacuum evaporation equipment uses a new evaporation boat, it needs to be treated with boat running, and the main processes are hot boat, boat burning and boat grinding. When using a new evaporation boat, it should be moistened to ensure that the evaporation boat is evenly infiltrated and the surface of the boat is heated evenly, so as to improve the service life and improve the problem of sputtering failure.

Among them, when the evaporation boat is used with an evaporation length of 150,000 meters, the evaporation boat needs to be replaced. After the evaporation boat is worn out, the pits on the boat surface are prone to liquid accumulation and uneven heating, resulting in the failure of splashing aluminum.

The beneficial effects of the present invention are:

By designing each step in the preparation process, the production process avoids damage to the film surface due to excessively high temperature during the vacuum evaporation process, improves the coating qualification rate and reduces the production cost. By making an aluminum oxide film coating on the original film, the adhesion between the coating and the original film is improved. During evaporation, the single deposition amount of metal material on the surface of the film is first reduced to reduce thermal radiation. After the film surface has enough reflective layer and heat-resistant layer, the single deposition amount of metal material on the surface of the film is increased. Coating efficiency, low deposition volume evaporation has been used to increase the oxide layer and increase the resistivity. At the same time, it avoids film surface deformation or film breakage caused by severe heating of the film surface, which is conducive to improving the product qualification rate.

detailed description

In order to facilitate the understanding of those skilled in the art, the present invention will be further described below with reference to the examples, and the contents mentioned in the embodiments are not intended to limit the present invention.

Example 1

A coating process, comprising the steps of:

The first step is to pretreat the original PET film, which specifically includes the following operations.

S11. Material and equipment testing, check whether the length, width, appearance, thickness, elongation, dyne value, quality and transmittance of the original film material are up to standard, check the wire diameter and purity of the aluminum wire material, and check the size of the evaporation boat. , Check the appearance, and finally carry out the equipment inspection and start-up inspection.

Among them, when the vacuum evaporation equipment uses a new evaporation boat, it needs to be wetted. The main processes are hot boat, boat burning and boat grinding to ensure uniform infiltration of the evaporation boat and uniform heating of the boat surface, improve service life and improve splashing. Aluminum failure problem.

When the evaporation boat is used with an evaporation length of 150,000 meters, the evaporation boat needs to be replaced. After the evaporation boat is worn out, the pits on the boat surface are prone to liquid accumulation and uneven heating, resulting in the failure of splashing aluminum.

S12. Coat aluminum oxide film, clean the vacuum evaporation equipment, then install the original film to the vacuum evaporation equipment, and adjust the wire feeding speed to 780mm/min, the film travel speed to 5m/s, the evaporation temperature to 1400℃, and the vacuum The temperature is 0.001mbar, and then the equipment is started. When the power of the evaporation boat reaches 6500W, the aluminum wire is fed into the evaporation boat to start the film running process. When the evaporation is over, the equipment is turned off, and the film material is taken out and sent to the next process. Through the production of the aluminum oxide film coating layer, the adhesion between the coating layer and the original film is improved.

S13. Bake the film, clean the vacuum evaporation equipment, install the film material treated by S12 into the equipment, and adjust the vacuum degree of the equipment to 0.002mbar and the film running speed to 150m/min, then start the equipment, when the evaporation boat When the current reaches 80% - 90%, the film running process starts, and the water on the surface of the film is dried by heating by the evaporation boat to ensure that there is no excess water on the surface of the film and the aluminum layer after evaporation will cause poor adhesion. Causes the failure of the bonding firmness between the aluminized layer and the film.

Step 2: Prime the evaporation, clean the vacuum evaporation equipment, install the film material processed in step 1 into the vacuum evaporation equipment, and when the voltage of the evaporation boat reaches 9.4V, apply it to the evaporation boat in the vacuum evaporation equipment. The aluminum wire is fed, and the film is subjected to three vacuum evaporations. The film speed of the three vacuum evaporations is 300 m/min, the evaporation temperature is 1400 °C, and the vacuum degree is 0.001 mbar. The wire feeding speed of the three vacuum evaporations is in turn: 350mm/min, 400mm/min and 400mm/min, when the evaporation is over, turn off the equipment, take out the film and send it to the next step. Because the film material is very thin after the previous work, the heat resistance is poor, and the single deposition amount is too large, and the film surface is seriously heated, which is easy to cause deformation of the film surface or film breakage. By performing at least one primer evaporation on the film material, less deposition amount is used to reduce heat radiation. After the film surface has enough reflective layer and heat-resistant layer, the single deposition amount is increased to avoid film surface deformation or film breakage. result in product scrap.

Step 3: Evaporation. After the primer is completed, the single deposition amount needs to be increased. Always use a low deposition amount for evaporation, which will cause the oxide layer to increase and the resistivity to increase. This step increases the speed of feeding the aluminum wire to the evaporation boat. The treated film is then subjected to four vacuum evaporations. When the voltage of the evaporation boat is 9.4V, the film running process starts. The wire feeding speed of the four vacuum evaporations is 500mm/min and the film running speed is 300m/min. , The vacuum degree is 0.001mbar, and the evaporation temperature is 1400℃.

Step 4: Rewinding, when the evaporation is over, turn off the equipment, collect the film material that has been evaporated into a roll, and when winding, as the coating thickens and the physical properties of the film change, it is necessary to adjust the tension and bending angle appropriately Flatten the mask surface to avoid wrinkles on the mask surface.

Step 5: Slitting and molding, according to the needs of use, the film material obtained in the step 4 is slitted, and the slitted roll material is pasted with a label.

Step 6: Scraper detection, because the aluminum sputtering by evaporation is likely to cause bulges on the surface of the product, in this step, the film obtained in step 4 is subjected to scraper detection, and the bulges are flattened or scraped off by scraper rolling and detection to avoid The product to the client causes the film to break and fail.

Step 7: Packing and storing, packing and sealing the film material detected in step 5, and storing the packaged aluminized film in the warehouse.

Example 2

A coating process, Example 2 has the following differences compared to Example 1.

The wire feeding speed during aluminum oxide film coating is 850mm/min.

The wire feeding speed of the first vacuum evaporation during primer evaporation was 400 mm/min, and the wire feeding speed of the second and third vacuum evaporation was 450 mm/min.

The wire feeding speed during the vapor deposition in step 3 was 550 mm/min.

Other process steps of Example 2 are the same as those of Example 1.

Example 3

A coating process, Example 3 has the following differences compared to Example 1.

The wire feeding speed during aluminum oxide film coating is 150mm/min.

The wire feeding speed of the first vacuum evaporation during primer evaporation is 300mm/min, and the wire feeding speed of the second and third vacuum evaporation is 350mm/min.

The wire feeding speed during the vapor deposition in step 3 was 450 mm/min.

The other process steps of Example 3 are the same as those of Example 1.

The above-mentioned embodiment is a preferred implementation scheme of the present invention. In addition, the present invention can also be implemented in other ways, and any obvious replacements are within the protection scope of the present invention without departing from the concept of the present invention.

Claims

A coating process is characterized in that: comprises the following steps:

Step 1: Pretreatment of the original film;

Step 2, primer evaporation, install the film material processed in step 1 into the vacuum evaporation equipment, send metal wires to the evaporation boat in the vacuum evaporation equipment, and perform vacuum evaporation on the film material at least once;

Step 3: Evaporating, increasing the speed of feeding the metal wire to the evaporation boat, and performing vacuum evaporation on the film material processed in Step 2 again;

Step 4: Roll up.
A coating process according to claim 1, wherein the step 1 comprises the following operations:

S1, metal oxide film is coated, the original film is installed in the vacuum evaporation equipment, the metal wire is fed into the vacuum evaporation equipment and oxygen is introduced, and the original film is vacuum evaporated after adjusting the wire feeding speed;

S2, drying the film, drying the film material treated by S1 to remove the moisture on the surface of the film material.
A coating process according to claim 1, characterized in that: the speed of feeding the metal wire during the primer evaporation is 300-450 mm/min.
A coating process according to claim 1, wherein the speed of feeding the metal wire is 450-550 mm/min during the vapor deposition in the third step.
A coating process according to claim 1, wherein the metal wire is an aluminum wire.
A coating process according to claim 1, wherein the original film is a PET film or a CPP film.
A coating process according to claim 1, wherein the number of times of vacuum evaporation in the second step is 1-5 times.
A coating process according to claim 1, wherein the number of times of vacuum evaporation in the step 3 is 1-20 times.
A coating process according to claim 2, wherein the temperature during vacuum evaporation in the first step, the second step and the third step is 1200-1600°C.
A coating process according to any one of claims 1-9, characterized in that: it further comprises the steps of slitting, scraper detection, and packing and storing the film obtained in step 4.