There are two types of bottle caps: one is insert type and the other is round rotary type. Plug-in bottle caps generally do not need to be repeatedly installed, the shape is more complex, it mainly completes some functional actions, such as spraying. At present, it is mainly used in the packaging of some plastic bottles such as shower gel, hair care products and insecticides. Circular rotary bottle caps are more common and have a wider range of use. In addition to protecting the products inside the bottle, this type of bottle cap protects it from environmental influences, and also functions to deliver important information (such as sophisticated products), such as the unified group of tea beverages and portlet packaging products. Plastic bottle caps.
Therefore, the decoration of the bottle cap should not be overlooked. This article discusses the printing of text or trademarks on the surface of rotary caps.
Pad printing is the preferred printing method for plastic caps
When a customer receives an order for printing a bottle cap, the first thing that comes to mind is the pad printing process. The pad printing process is a unique printing method developed with the screen printing process, similar to the rubber stamp in our daily life. Pad printing adopts a relatively independent position relationship between the plate and the substrate, and no matter how strange the shape of the substrate, it can perform its task with outstanding performance. This led to the selection of the pad printing process for many tasks that were so difficult to accomplish as “universal printingâ€.
Using the printing process to print plastic caps has several advantages over other printing processes
(1) It is convenient to change the varieties and the plate making is simple.
(2) Low investment. Compared with other printing equipment, pad printing equipment has the least investment.
(3) Strong adaptability. The shape of the printing head can be changed at will, which makes the adaptability of the printing technology to the shape of the printing material greatly enhanced. It is suitable for the printing of caps with different appearances and sizes. According to our investigation, about 80% of caps will not have a diameter greater than 40mm. This means that a pad printing machine with a plate area of ​​100 mm x 100 mm can print about 80% of the caps.
Plastic bottle cap printing elements
1. Ink
In the printing of plastic caps, the choice of ink is crucial. Bottle caps are basically made of PP and PE materials, and the selected ink must match the type of printing material. When choosing an ink, you should pay attention to the following two points.
(1) Hardeners have been added to some inks to improve their adhesion, but they have increased the difficulty of operation. Therefore, unless the customer has special requirements, it is recommended not to use this method.
(2) It is best to use pad printing ink instead of screen printing ink. Screen printing inks have good leveling properties, while pad printing inks have better gel properties; screen printing inks have a relatively slow drying speed, and pad printing inks have a faster drying speed.
Although solvent-based screen printing inks can be used for pad printing, they are not as effective as special pad printing inks. If you need to use UV ink, you should not use screen printing UV ink, because screen printing UV ink transfer is poor. If you must use screen printing UV ink, you should add a certain amount of gelling agent.
2. Plastic head
At present, the selection of plastic heads is generally not considered in China. However, when printing, the selection of plastic heads should be very strict. In the cap printing, circular plastic head application is more common. When choosing a plastic head, the following two points need to be noted.
(1) In the printing process of half tone images, the hardness and shape of the rubber heads used in the yellow, magenta, and cyan colors must be exactly the same, and the hardness of the rubber heads used in black may be slightly larger.
(2) Choose a good plastic head with good film release. This type of rubber head draws on the essence of the offset rubber blanket formulation to improve the printing quality of PP and PE surfaces.
3. Printing plate
For resin cap manufacturers who value print quality, using resin gravure is a wise choice. This printing plate is made of a nylon polymer without the need for corrosion processes, which is conducive to quality management. At present, resin gravure is more commonly used in pad printing machines produced in Europe and the United States.
4. Cost
The area of ​​the bottle cap printing is small, so some people think that there is no need to worry about its cost. However, as market competition intensifies, it should still pay attention to reducing costs. This is the reason why many manufacturers use pad printing instead of flexo printing when printing caps.
At present, the cheapest single-color pad printing machine is priced at 10,000 yuan, including steel plates, clamps and plastic heads. With such a configuration, the monochrome printing cost of the bottle cap is generally not higher than 1 cent. If the automatic printing system is used, the cost is lower.
Therefore, the decoration of the bottle cap should not be overlooked. This article discusses the printing of text or trademarks on the surface of rotary caps.
Pad printing is the preferred printing method for plastic caps
When a customer receives an order for printing a bottle cap, the first thing that comes to mind is the pad printing process. The pad printing process is a unique printing method developed with the screen printing process, similar to the rubber stamp in our daily life. Pad printing adopts a relatively independent position relationship between the plate and the substrate, and no matter how strange the shape of the substrate, it can perform its task with outstanding performance. This led to the selection of the pad printing process for many tasks that were so difficult to accomplish as “universal printingâ€.
Using the printing process to print plastic caps has several advantages over other printing processes
(1) It is convenient to change the varieties and the plate making is simple.
(2) Low investment. Compared with other printing equipment, pad printing equipment has the least investment.
(3) Strong adaptability. The shape of the printing head can be changed at will, which makes the adaptability of the printing technology to the shape of the printing material greatly enhanced. It is suitable for the printing of caps with different appearances and sizes. According to our investigation, about 80% of caps will not have a diameter greater than 40mm. This means that a pad printing machine with a plate area of ​​100 mm x 100 mm can print about 80% of the caps.
Plastic bottle cap printing elements
1. Ink
In the printing of plastic caps, the choice of ink is crucial. Bottle caps are basically made of PP and PE materials, and the selected ink must match the type of printing material. When choosing an ink, you should pay attention to the following two points.
(1) Hardeners have been added to some inks to improve their adhesion, but they have increased the difficulty of operation. Therefore, unless the customer has special requirements, it is recommended not to use this method.
(2) It is best to use pad printing ink instead of screen printing ink. Screen printing inks have good leveling properties, while pad printing inks have better gel properties; screen printing inks have a relatively slow drying speed, and pad printing inks have a faster drying speed.
Although solvent-based screen printing inks can be used for pad printing, they are not as effective as special pad printing inks. If you need to use UV ink, you should not use screen printing UV ink, because screen printing UV ink transfer is poor. If you must use screen printing UV ink, you should add a certain amount of gelling agent.
2. Plastic head
At present, the selection of plastic heads is generally not considered in China. However, when printing, the selection of plastic heads should be very strict. In the cap printing, circular plastic head application is more common. When choosing a plastic head, the following two points need to be noted.
(1) In the printing process of half tone images, the hardness and shape of the rubber heads used in the yellow, magenta, and cyan colors must be exactly the same, and the hardness of the rubber heads used in black may be slightly larger.
(2) Choose a good plastic head with good film release. This type of rubber head draws on the essence of the offset rubber blanket formulation to improve the printing quality of PP and PE surfaces.
3. Printing plate
For resin cap manufacturers who value print quality, using resin gravure is a wise choice. This printing plate is made of a nylon polymer without the need for corrosion processes, which is conducive to quality management. At present, resin gravure is more commonly used in pad printing machines produced in Europe and the United States.
4. Cost
The area of ​​the bottle cap printing is small, so some people think that there is no need to worry about its cost. However, as market competition intensifies, it should still pay attention to reducing costs. This is the reason why many manufacturers use pad printing instead of flexo printing when printing caps.
At present, the cheapest single-color pad printing machine is priced at 10,000 yuan, including steel plates, clamps and plastic heads. With such a configuration, the monochrome printing cost of the bottle cap is generally not higher than 1 cent. If the automatic printing system is used, the cost is lower.
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