CN-121973483-A - Application method of cellulose acetate film in OMD (open-close decoration) technology

Abstract

The invention discloses an application method of a cellulose acetate membrane in an OMD (open-mould decoration) process, and belongs to the technical field of an external-mould decoration process. The application method of the cellulose acetate membrane in the OMD decoration process comprises the following steps of firstly, carrying out primary coating treatment on the joint surface of the cellulose acetate membrane to form a primer layer, secondly, coating thermal-reactive PU glue on one side surface of a PC membrane, baking to form a glue layer, thirdly, carrying out hot pressing compounding on the primary coated cellulose acetate membrane and the PC membrane through the thermal-reactive PU glue to obtain a composite membrane, and fourthly, integrally transferring and attaching the composite membrane to the surface of an ABS/PC injection molding part through a vacuum pressure difference coating process to finish OMD external decoration.

Inventors

• ZHANG HONG
• Hu Zupei

Assignees

• 无锡源辉科技有限公司

Dates

Publication Date

20260505

Application Date

20260408

Claims (7)

1. 1. An application method of cellulose acetate film applied to OMD decoration technology is characterized by comprising the following steps: Firstly, carrying out primary coating treatment on the bonding surface of the cellulose acetate membrane to form a primer layer; coating heat reactive PU glue on one side surface of the PC film, and baking to form a glue layer; Step three, hot-pressing and compounding the cellulose acetate membrane and the PC membrane which are subjected to the primary coating through thermal reactive PU glue to obtain a composite membrane; and step four, integrally transferring and attaching the composite membrane to the surface of an ABS/PC injection molding piece through a vacuum pressure difference membrane covering process, and finishing OMD external mold decoration.
2. 2. The application method of the cellulose acetate film applied to the OMD decoration process according to claim 1, wherein the thickness of the cellulose acetate film is 60-100 μm, and the thickness of the PC film is 0.1-0.3 mm.
3. 3. The application method of the cellulose acetate film to OMD decoration process according to claim 1, wherein the thickness of the heat reactive PU glue coating is 20-50 μm.
4. 4. The application method of the cellulose acetate film to the OMD decoration process according to claim 1, wherein the baking condition of the heat reactive PU glue coating is 50-60 ℃ baking for 8-20 min, and curing is carried out for 12-32 h at 40-60 ℃ after compounding.
5. 5. The application method of the cellulose acetate film applied to the OMD decoration process according to claim 1, wherein the PC film is a transparent light film or a matte PC film, and the bright light or matte decoration effect is respectively realized.
6. 6. The application method of the cellulose acetate film applied to the OMD decoration process according to claim 1, wherein the composite film structure sequentially comprises a PC film, a thermal reaction PU glue layer, a primer layer, a cellulose acetate film, a primer layer, an adhesive layer and a protective film.
7. 7. The application method of the cellulose acetate film applied to the OMD decoration process according to claim 1, wherein the vacuum degree of the vacuum pressure difference film coating process is-0.06 to-0.09 MPa, the molding temperature is 125-165 ℃, and the film coating time is 5-30 s.

Description

Application method of cellulose acetate film in OMD (open-close decoration) technology Technical Field The invention relates to the technical field of external mold decoration technology, in particular to an application method of a cellulose acetate membrane in an OMD decoration technology. Background Compared with the traditional IMD in-mold decoration process, the OMD (OutMoldDecoration, out-mold decoration) process does not need to cut a jig, punch a jig and mold a jig, has the advantages of low mold opening cost, short proofing period, flexible process and the like, is rapidly popularized in the fields of consumer electronics, household appliances, automobile interior decoration and the like, and the cellulose acetate membrane is an environment-friendly high-polymer decoration material, and becomes an ideal choice for high-end appearance decoration by virtue of the unique performance advantage of the cellulose acetate membrane. The membrane can be treated by a special process, has rich high-end visual effects such as pearl, multicolor, texture and texture of fritillary bulb, can meet the demands of different products on personalized and high-end appearance, and meanwhile, compared with the traditional decorative membrane, the cellulose acetate membrane also has the outstanding advantages of difficult yellowing, low smell and good flame retardance, is difficult to age and change color in the use process, has no pungent smell, can meet the flame-retardant safety requirement of the high-end product, and is suitable for various indoor and outdoor use scenes. Based on the above, the inventor finds that the following problems are that the surface gloss of the cellulose acetate film is low, the fullness is poor, the brittleness is high, the cellulose acetate film is easy to break, the decorative film needs to be subjected to molding steps such as stretching, bending and attaching, and the like, especially, the cellulose acetate film has strong brittleness and insufficient toughness aiming at curved surfaces and special-shaped structures of decorative pieces, the cellulose acetate film is extremely easy to crack, break and break in the stretching and curved surface molding process, the molding failure is caused, the molding requirement of an OMD process cannot be met, the surface polarity is low, the bonding is difficult, the adhesive force between the glue and an injection molding piece is poor, the glue is difficult to wet and attach on the surface, the bonding strength between the film and the glue is insufficient, and the molded decorative pieces are easy to fall off and lift, and the defects can not be directly applied to the OMD external mold decoration process. Accordingly, in view of the above, the present invention provides an application method of cellulose acetate film in OMD decoration technology to achieve the purpose of more practical value. Disclosure of Invention The invention aims to provide an application method of a cellulose acetate film applied to an OMD (open-die decoration) process, so as to solve the problem that the cellulose acetate film provided in the background art cannot be directly applied to an OMD external-die decoration process due to inherent defects of the cellulose acetate film. In view of the above problems, the technical scheme provided by the invention is as follows: an application method of cellulose acetate film applied to OMD decoration technology comprises the following steps: Firstly, carrying out primary coating treatment on the bonding surface of the cellulose acetate membrane to form a primer layer; coating heat reactive PU glue on one side surface of the PC film, and baking to form a glue layer; Step three, hot-pressing and compounding the cellulose acetate membrane and the PC membrane which are subjected to the primary coating through thermal reactive PU glue to obtain a composite membrane; and step four, integrally transferring and attaching the composite membrane to the surface of an ABS/PC injection molding piece through a vacuum pressure difference membrane covering process, and finishing OMD external mold decoration. Further, the thickness of the cellulose acetate membrane is 60-100 mu m, and the thickness of the PC membrane is 0.1-0.3 mm. The adoption of the further scheme has the beneficial effects that the thickness of the cellulose acetate membrane is limited to 60-100 mu m, the thickness of the PC membrane is limited to 0.1-0.3 mm, the molding flexibility and the decoration texture of the cellulose acetate membrane are ensured, the PC membrane has enough supporting strength, the problems that the composite membrane is too thin and easy to damage and too thick and difficult to attach are avoided, the molding requirement of a vacuum pressure difference membrane coating process is adapted, and the lamination smoothness and the difficult warping of the composite membrane are ensured. Further, the coating thickness of the heat reactive PU glue is 20-50 mu m