The problems encountered with
plastic woven bags in ink printing are as follows:
First, back sticky
Phenomenon: After printing the plastic woven bag, the ink layers adhere to each other. Causes: 1. There is a dry false phase after printing. 2. The angle of the drying device is incorrect or malfunctions. 3. Because the printing speed is too fast, the rewinding is too tight. 4. The storage pressure is too large. 5, the ink is too thin and transparent.
Remedy: 1. Improve ink drying speed. 2. Increase the ventilation intensity to check the angle of the drying device. 3, slow down the printing speed 4, stacking less when printing or storage stacking load should be light. 5. Adjust the viscosity of the ink or change the ink.
Second, poor printing fastness
Phenomenon: After printing the plastic woven bag, the ink layer faded. Causes: 1. The surface of the PPPE corona is not handled well. 2. The temperature and relative humidity of the printing workshop are too large. 3. The dissolved hydrogen bonding force of the ink system is too different from the dissolved hydrogen bonding force of the woven bag substrate.
Remedy: 1. The surface of the woven bag substrate reaches about 38 dynes. 2. Try to control the relative humidity of the workshop between 50-60%, but not too low. When it is lower than 40%, it is easy to generate static electricity. It is best to control the room temperature at 18 to 23 degrees, and keep the environment clean and air circulation. 3, the ink should be very careful (same nature), the use of ink should be appropriate, as small as possible, the viscosity of the ink system is high.
Third, bleed
The cause of the malfunction: 1. The edge of the printed graphic is infiltrated with color (generally due to the selection of dyes in the ink). 2, the use of pigments is not properly matched. 3. Excessive use of thinner materials, especially poor compatibility between thinner and ink.
Remedy: 1. Add gold oil or add coupling agent to the ink. 2. Change the new ink. 3, try to use less thinner, especially the solvent that can dissolve with the ink.
Fourth, the ink film is dull
The cause of the failure: 1, poor gloss. 2, the ink is rough. 3. The ink dries too fast. 4, the ink system resin components are small or wrong to add matting agent.
Remedy: 1. Add the appropriate amount of varnish in the ink. 2. Re-grind or filter the ink. 3. Replenish water or original ink. 4. Add no or less matting agents (such as wax, silica, etc.) as much as possible.
Plastics Materials
Plastics materials are a group of synthetic materials that have become essential in today's world due to their versatility, durability, and low cost. These materials are used in a wide range of applications, from packaging and consumer goods to construction and automotive industries.
There are various types of plastics, classified based on their properties and the manufacturing process. These include polyethylene, polypropylene, polystyrene, polyvinyl chloride, nylon, and polycarbonate, among others.
Polyethylene is the most commonly used plastic and is often used in packaging materials such as plastic bags and containers. Polypropylene is similar to polyethylene but is more rigid, and thus, often used in products that require a stiffer material, such as automotive parts and furniture.
Polystyrene is a rigid and transparent plastic that is often used in products such as disposable cups, cutlery, and packaging materials. Polyvinyl chloride, commonly known as PVC, is a popular plastic for construction materials such as pipes, electrical cables, and window frames.
Nylon is a strong and flexible plastic used in various applications, such as clothing, carpet fibers, and mechanical parts. Polycarbonate is a durable and transparent plastic often used in products such as safety goggles, aircraft windshields, and electronic device screens.
While plastics have revolutionized various industries, the disposal of plastic waste has become a significant environmental concern. Recycling and proper disposal of plastics materials are crucial to reducing plastic pollution and preserving the environment for future generations.
Overall, plastics materials have significantly impacted modern society, providing solutions for various industrial and consumer needs. As research and innovation continue to advance, it is expected that even more sustainable and eco-friendly plastics materials will emerge.
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