What is the material of the inner lining?

　　 In-membrane lamination It is a new type of label‑packaging format that differs from traditional direct screen printing, heat‑shrink labels, and non‑adhesive labels, and has been popular in Europe and North America for many years. After a two‑to‑three‑year wait in the domestic market, it has finally begun to see large‑scale adoption. In‑mold labeling is primarily used for blow‑molded and injection‑molded products made from materials such as PP, PE, and PET.

In other words, prior to blow molding or injection molding, a pre‑printed internal insert is placed inside the mold cavity. During the blow‑molding or casting process, the high temperature and pressure of the mold cause the special insert to dissolve into the mold’s interior, seamlessly fusing with the surface of the resulting bottle body or molded part. Once the mold is opened, the precisely printed bottle or molded component is completed in a single step. Around 2005–2007, mainland China began using small adhesive labels as an anti‑counterfeiting measure; at the time, printing technology could not yet meet the standards required for such tiny labels, necessitating specialized injection‑molding equipment. By 2009, most EU member states had banned the import of tableware featuring inner‑side decals. These small adhesive labels have since become integrated into everyday life.

　　 In-membrane lamination What is the material?

　　Label materials commonly used for in‑mold labeling fall into three categories: PP, PE, and a PP/PE copolymer. In‑mold labels consist of three layers: the first is an adhesion layer, the second is the core layer, and the third is a hot‑melt release layer. In‑mold labels must provide effective venting; the quality of this venting directly affects the appearance of the finished part. Additionally, after printing, in‑mold labels should undergo an antistatic treatment; otherwise, the yield rate of the labeled parts will be adversely impacted.

　　1. Chemical Removal Method: The chemical removal method typically involves applying an antistatic agent to the surface of the approved material to render it conductive. However, this approach has certain limitations. Adding chemical additives during papermaking can adversely affect paper quality—reducing tensile strength, adhesion, and overall structural integrity—so the chemical removal method is generally not employed.

　　2. Physical Elimination Method: The physical elimination method removes static electricity by leveraging its intrinsic properties without altering the material’s characteristics; it is a widely employed technique in industrial production.

　　3. Humidity‑Controlled Dissipation Method: The surface resistivity of printed materials decreases as relative air humidity increases; therefore, raising the relative humidity can enhance the electrical conductivity of the paper surface and accelerate charge dissipation. Optimal environmental conditions for printing facilities are a temperature around 20°C and a relative humidity of 70% or higher.

　　 In-membrane lamination It is primarily used for blow‑molded and injection‑molded products made from materials such as PP, PE, and PET. In other words, prior to blow molding or injection molding, a pre‑printed in‑mold label is placed inside the mold. During the blow‑molding or injection‑molding process, the high temperature and pressure of the mold cause a special adhesive on the label to bond with the molded part, seamlessly integrating the label into the surface of the bottle or molded component. Once the mold is opened, the precisely printed bottle body or molded part is completed in a single step.

1. Beauty and cosmetic product packaging containers

　　2. Packaging containers for pharmaceuticals and health supplements

　　3 Food and beverage packaging containers

　　4 Packaging containers for powdered and liquid chemical products such as oil

　　5 Packaging containers for edible oil, soy sauce, vinegar, and other seasonings