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Die-cutting process control of mobile phone protective film

by:SYJ     2021-07-13

As we all know, in the structure of electronic products, the die-cutting of the protective film is an indispensable part. Whether it is a mobile phone, a camera or a tablet, a protective film must be affixed to protect the screen of the product before leaving the factory.

The transparency, flatness, and cleanliness of the protective film affect consumers’ impression of electronic products. Since the high-quality protective film improves the appearance of electronic products, the die-cutting factory has strict technical control on the protective film produced .

The choice of protective film material.

When producing mobile phone protective film, the choice of materials needs attention. First of all, on the basis of meeting customer requirements, select materials suitable for printing and mold cutting, such as good scratch resistance, good ink adhesion, and not easy to moisturize.

Protection film production environment control.

There are two important points in the quality control of protective film products. Damage and dirt must be avoided. In order to meet these two requirements, a good production environment is first required, and the die-cutting plant is equipped with an independent clean and purified site for protective film production. Clean workshop, also known as clean workshop, clean workshop, and clean workshop, refers to the elimination of particulates, harmful air, bacteria and other pollutants in the air within a certain space, and the elimination of indoor temperature, cleanliness, pressure, airflow velocity, airflow distribution, and noise Vibration, lighting and static electricity are controlled within a certain range of requirements, and specially designed rooms are given. No matter how the external air conditions change, the cleanliness, temperature, humidity, pressure and other parameters must be kept unchanged in the clean purification site. According to the requirements of the production products, the cleanliness of the clean purification plant is class 100, class 1,000, class 10,000, class 100,000, and class 300,000.

In a clean and decontaminated site, under dynamic conditions, the biggest source of bacteria and dust is the operator. Therefore, workers must wear clean clothes before entering the cleaning and purification site, and shower with clean air for 15 seconds in the shower room to remove dust particles attached to the surface of the clothes.

Control of protective film printing technology.

Most plastic films (such as polyolefin films) are non-polar polymers with low surface tension, generally 29~30mN/m. In theory, if the surface tension of an object is lower than 33mN/m, Known inks and adhesives cannot adhere to it, so the surface must be corona treated. The material of the protective film is mostly polyolefin, and corona treatment is required before printing. The corona power is usually 4.0W and the speed is 30m/min. After the corona, it is required to print within 5 minutes, and then print the corona again after more than 10 minutes.

During the printing process, the protective film material is in contact with the embossing roller, and friction will damage the surface of the material. Therefore, as we all know, in the composition of electronic products, the protective film is an indispensable part, whether it is a mobile phone, a camera or a tablet computer, a protective film must be attached to protect the screen of the product before leaving the factory. The transparency, flatness, and cleanliness of the protective film affect consumers' impression of electronic products. Good quality protective film improves the appearance of electronic products. The mold cutting factory has strict technical control on the protective film products produced.

Die cutting technology of protective film.

After the protective film is printed, it is cut into shape with a round knife cutting machine. During the cutting process, attention should be paid to avoid damage and ink collapse. The specific manifestation of ink collapse is that the ink layer on the edge of the product should be laid and smooth, and as a result, there is no ink in some parts.

The main reason for the collapse in the die-cutting process is that the ink and the protective film are not firmly attached. The edge of the die-cut product separates the ink layer and the protective film, resulting in jagged edges. Therefore, the printed protective film must check the ink adhesion fastness to ensure that the ink adhesion is good. In addition, the thick ink layer can also cause the ink to collapse.

There are many reasons for easy injury in the die-cutting process, the most common is the uneven rotation of the pressure roller, and the relative sliding of the material and the pressure roller are injured. Therefore, check the rotation of the pressure roller before die cutting to ensure that the pressure roller in contact with the material rotates flexibly. In addition, foreign matter on the pressure roller will damage the protective film and damage, so before die cutting, wipe the pressure roller with a clean cloth dampened with alcohol to ensure that the surface of the pressure roller is clean and free of foreign matter.

The die-cut shape of the protective film is generally designed according to the customer's drawing requirements, mainly according to the screen shape and size of the customer's mobile phone product, usually a rectangle with rounded corners, with a handle at the bottom right corner of the rectangle. The handle is printed on the back and covered with PET film roll, which is convenient for customers to assemble, and consumers can also peel off the protective film from the screen. Various shapes of protective films use round knives when die-cutting, but the number of round knives required for complex technology has increased. For example, a protective film that needs to be attached to a handle requires two round knives, one handle and the other handle.

Control of protective film packaging technology.

After the die-cutting of the protective film is completed, it is usually in a roll shape. When packaging, it is first cut into single pieces, and every 500 pieces are packed in one group. When packaging, wrap the protective film with stretch film, and then put it in a plastic bag. The main attention is paid to cleanliness when packaging, so the operator is required to wear gloves for manual operation. For example, a protective film product needs to be manually attached to the handle later, and the operator requires the handle to be attached to the correct position of the protective film tape surface (ie, the middle) to ensure that the product is not dirty and free of foreign objects. The above technologies are required to be completed at the cleaning and purification site.

The mobile phone protective film looks simple, and the production technology is not complicated, but the requirements of each link are strict. In general, always pay attention to cleanliness, do not bend and wipe the protective film. The above little details determine the grade of the product.


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Wuxi Shengyujie Technology Co., Ltd. believes that the average profitability will be sufficient.
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