bag in box packaging distributors.Introduction to the process of aluminum plating bags and aluminum washing bags

There is a clear difference between aluminum washing bags and aluminum plating bags. Aluminum plating bags are generally composed of the entire bag or the front (or back, referred to as the yin yang bag) of the entire bag and the aluminum plating film. On the other hand, washing aluminum bags is different. As long as any part of the bag needs to have the luster effect of aluminum and which part is transparent and visible, it can be designed and produced without being limited to a specific position or a certain regular pattern.

Next, professional flexible packaging manufacturers will discuss the characteristics of washing aluminum bags for packaging. Aluminum washing bags have the characteristics of clear graphics and text, high accuracy, strong three-dimensional sense, rich layers, bright colors, smooth surface, and high wear resistance. From the perspective of commercial safety, aluminum washing bags are also a strong anti-counterfeiting packaging form, which helps to improve product grade and added value, and has stronger product market competitiveness.

1. Introduction to Washing Aluminum Bags

Aluminum washing bag, also known as partial hollow aluminum plating bag, is a composite packaging bag that uses plastic film to composite partial hollow aluminum plating film (or partial aluminum plating layer to remove aluminum) and partially transparent. Washing aluminum is the process of removing or washing off the localized aluminum coating on a thin film. The aluminum plating film washing process, also known as the aluminum removal process, and some are also known as the partial hollow aluminum removal process. There are many different names, but essentially it means that the local aluminum plating layer of the film is washed off to form a beautiful and anti-counterfeiting packaging bag.

At present, the material structure of aluminum washing bags is generally PET+aluminum plating layer CPP, OPP+VMPET+CPP (PE), etc., which can be designed according to different customer needs.

2. Characteristics of Aluminum Bag Washing Process

1. Traditional alkaline aluminum washing method

The traditional alkaline aluminum washing method is a process of using semi-automatic equipment to remove aluminum from the aluminum plating layer through alkaline liquid. The main component of alkaline liquid is sodium hydroxide solution, commonly known as caustic water. The aluminum coating is chemically reacted and the corresponding aluminum coating of the aluminum coating film is washed off through an aluminum washing tank device.

The traditional aluminum washing method is very convenient to remove the aluminum film, but it releases hydrogen gas during operation, which cannot be close to the flame when operating in a ventilated area and poses certain risks. And because of this traditional local aluminum plating process, usually after printing and aluminum plating, a layer of protective agent is applied to the area where the aluminum plating needs to be retained, and then cleaned with alkaline water. Due to the inability of protective agents to overprint, the yield is not high. At the same time, alkaline water will corrode the edges of the aluminum layer, making it difficult to fully retain fine lines or words.

2. Post press aluminum plating method

This method involves plating aluminum on a layer of PET color printing film that has already been printed with patterns, and then laminating this layer of PET color printing aluminum film with another layer of film through a hot melt adhesive to form a composite layer of color printing film aluminum coating packaging bags. Compared with the traditional aluminum washing process, it has the following advantages:

The processing process is simple, simplifies the aluminum washing process, saves two layers of film, and reduces production and product costs.

Adopting a hot soluble adhesive cold rolling composite processing process, the color printing film aluminum plated packaging bag is sturdy and durable, without any cracking phenomenon.

3. Clean water aluminum washing method

This process method can remove the aluminum coating from the transparent area, improve the stability of aluminum washing, and prevent pollution. The aluminum washing device comprises at least one water tank, a cleaning roller arranged inside the water tank, and a guide roller arranged above the water tank to form an aluminum washing line. During cleaning, the packaging film constantly moves in the sink, and under the action of clean water in the sink and the cleaning roller, the aluminum coating on the hydrophilic ink is washed away. This cleaning method overcomes the shortcomings of existing alkaline aluminum washing devices that use chemical reactions, such as instability, long time consumption, high energy consumption, and environmental pollution. Using clean water from the sink to clean can also achieve excellent aluminum washing effect, uniform and stable product quality, and complete and clear graphics and text; Capable of large-scale mechanized production, very suitable for the production of washed aluminum packaging bags.

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