There are two key points in the quality control of PET protective film products, we must avoid scratches and dirt. In order to meet these two requirements, we must first have a good production environment. The die-cutting factory is equipped with an independent dust-free purification workshop for protective film production. Dust-free purification workshop, also known as clean workshop, clean room, or clean room, refers to the removal of particulates, harmful air, bacteria and other pollutants in the air within a certain space, and the indoor temperature, cleanliness, The pressure, airflow velocity and airflow distribution, noise and vibration, lighting, and static electricity are controlled within a certain range of requirements, and are given to specially designed rooms. No matter how the external air conditions change, it is required that the previously set parameters such as cleanliness, temperature, humidity and pressure can be maintained in the clean room. According to the needs of the production products, the cleanliness of the dust-free purification workshop has different levels of 100, 1,000, 10,000, 100,000, and 300,000.

In the dust-free purification workshop, under dynamic conditions, the biggest source of bacteria and dust is the operator. Therefore, before the operator enters the dust-free purification workshop, he must wear clean clothes and shower with clean air for 15 seconds in the air shower to remove the dust particles attached to the surface of the clothes.

PET film printing process control

Most plastic films (such as polyolefin films) are non-polar polymers with low surface tension, generally 29 to 30 mN/m. In theory, if the surface tension of an object is lower than 33 mN/m, it is currently known that The ink and adhesive cannot be firmly attached to it, so the surface should be corona treated. The protective film is mostly made of polyolefin and needs to be corona treated before printing. Usually, the corona power is 4.0W and the speed is 30m/min. After corona, it is required to print on the machine within 5 minutes, and if it exceeds 10 minutes, it needs to be corona again before it can be put on the machine.

During the printing process of PET protective film, since the PET protective film material will contact with the embossing roller, friction will cause scratches on the surface of the material. Therefore, it is necessary to wrap all the embossing rollers in contact with the protective film with a layer of soft clean. As we all know, in the composition of electronic products, the protective film is an indispensable part of it. Whether it is a mobile phone, a camera or a tablet computer, it is A protective film should be attached to protect the product screen. The transparency, flatness, and cleanliness of the protective film affect consumers' impression of electronic products. A good quality protective film will also enhance the external image of electronic products. Therefore, the die-cutting factory has all kinds of protective film products produced. Strict process control.