Talking about the verification of the label raw materials in the mold

In recent years, in-mold labels have been increasingly used widely and are favored by many leading brands such as automotive lubricants, personalization, food and beverage, and pharmaceuticals. At the same time, the topic of the supply and quality of in-mold label raw materials has gradually attracted the attention of the industry.

YUPO Corporation, as the leading manufacturer of in-mold label materials in the world, attaches great importance to the Chinese market, and has always spared no effort in developing and providing technical services for blow mold materials, and has continued to conduct in-depth communication and exchanges with customers. Developed white or transparent label materials for different needs. After using the in-mold labels, the container products can reflect: 1) beautiful decorative, 2) strong anti-counterfeiting, 3) excellent environmental protection, 4) comprehensive cost saving, and other factors, which can solve the problems that plagued end customers. This is also the main reason why in-mold labeling has continued to grow in recent years.

In addition to the inherent characteristics of polypropylene synthetic paper, the YUPO in-mold label also makes good use of the three-layer structure of the material itself. The surface of the printing surface has a good printing performance after special treatment. It is very suitable for the commonly used offset, soft Traditional printing methods such as edition, letterpress, gravure, silk screen, etc., can also achieve excellent results in the processing of cold stamping and hot stamping. The low-melting resin used in the adhesive layer of the bottom layer can not only make the label and the container more tightly combined in the in-mold molding, but also the unique gel pattern design greatly enhances the exhausting property and better prevents bubbles. , folds and other undesirable phenomena.

However, an end-product that uses in-mold labels and can eventually be successfully introduced to the market, from initial printing, coating, static elimination, die-cutting, label packaging, to the final robot arm labeling and even the entire process of blowing the bottle It is inseparable from the excellent and stable quality of the label raw materials. If the difference in the characteristics of the label material is insufficient, problems such as white spots, low ink adhesion, and bubbles during in-mold molding tend to occur during printing. Therefore, how to do a good job in the verification of the label material in the mold has also aroused the attention of a large number of users.

The following uses YUPO's in-mold label blanks as an example to briefly introduce the basic verification content of the label material after slitting to shipping:

1) The appearance of the material

A: thickness, size

Method: Thickness Gauge, Ruler

Description: Good dimensional stability can ensure the accuracy of overprinting and die-cutting positioning of printed graphics and improve the yield.

B: surface indentation, folds, dirt, etc.

Method: Visual inspection

Note: The material with surface indentation and wrinkles is easy to produce white spots, printing is not true and so on, to ensure the flatness and smoothness of the printing surface to ensure its printability.

C: Flatness of the end surface (reel)

Method: ruler, visual inspection, etc.

Note: If the reel end flatness is not the same, it is likely to cause misprints and increase the loss during the printing of the rotary machine.

D: hardness (reel)

Method: Hardness Tester

Note: Because the web material used for rotary printing is relatively common, the tension during the slitting and rewinding is too loose or too tight, it may cause the tension on the rotary printing equipment to not match, resulting in downtime and other failures. Therefore, the slitting and rewinding are guaranteed. The tension of tension must not be ignored.

2) Printability of materials

A: Printing properties of ink

Method: Color Display

Explanation: The use of the customer's commonly used ink to test the material to confirm whether the material in the transport, storage process due to climate, environmental, temperature and humidity changes caused by the possibility of printing performance, to confirm the shipment before the inspection sample White spots, light transmission and other phenomena.

B: Adhesion of ink:

Method: tape, varnish, etc.

Description: After testing the material with the ink commonly used by the customer, the tape is used for stripping test to test the fastness between the ink and the material, effectively preventing and reducing the easy-to-drop out of the ink easily produced by the customer after using the material. Points and other phenomena.

C: surface tension of the material

Method: Corona, Dyne Pen

Explanation: It is required to pass the tested material to 38 dyne or more. If the surface tension of the synthetic paper material is lower than 38 dyne, the ink will shrink when printing, and the firmness of the printed text will also be affected after deformation and drying. Therefore, the synthetic paper material can only guarantee the printing quality when it is more than 38 dyne.

Through the introduction of the above verification content, I believe that you have a further understanding of the characteristics of the label material in the mold. With the diversification of the printing and processing technologies on the in-mold labels of market users, it is bound to put forward higher requirements on the suitability of materials. For this reason, YUPO will, as always, be committed to the needs of the market and continue to win the market's reputation with excellent and stable quality.