Method to improve film property

A method improves the property of films including a release film and a protective film. After separating from the release film, the protective film is bonded with a TAC (Triacetyl Cellulose) film and then processed by coating, such as with an anti-reflecting coating, an anti-glaring coating and a surface hardening treatment, and by drying in an oven. The protective film is separated from the TAC film. The waste of material, which resulted from cracks, snaps and bends of the film, is avoided in the process. Furthermore, practice costs are low, and additional expensive apparatus or treatment are not necessary for a simplified procedure of the method.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a method to improve properties of a film including a release film and a protective film. The protective film is bonded with a TAC (Triacetyl Cellulose) film after separating from the release film. The bonded TAG film is processed by coating, such as with an anti-reflecting coating, an anti-glaring coating or a surface hardening treatment, and by driving in an oven. Thereafter, the protective film is separated from the TAC film.

2. Description of the Prior Art

As science develops day-by-day and advances greatly, the products for high technologies are focused on the principles of having small volume and being lightweight for marketing. Thus, the procedures for manufacturing may be considered more than before. For example, a film is very fragile and tends to be cracked or bent due to the thin thickness thereof. Hence, the cost of raw materials is greater than required. In the field, there is no solution to the above issue, and prior art for another field is provided hereinafter for discussion.

A Taiwan patent, numbered 524748, teaches a film sticking method. Firstly, the surface film is removed by a roller. The base film is cut at spacings, and strips thereof are removed from the bottom film. Then, after directing by rollers, the bottom film is on substrates.

Another Taiwan patent, numbered 546728, is related to an adhesive film for protecting a wafer surface of a semiconductor. At least one middle layer and an agglutinant layer are provided on one surface of a base film. The minimum value (G′min) range of a storing flexibility rate (G′) of the agglutinant layer (B) in the temperature range of 50 to 100° C. is between 0.07 to 5 Mpa. The storing flexibility rate for the middle layer (C) at 50° C. is above 0.001 Mpa, but not approaching to 0.07 Mpa. A total thickness (μm) of the agglutinant layer's thickness (tb) and the middle layer's thickness (tc) meets the following equation: tc≧3 tb.

The third Taiwan Patent No. 498318 discloses a method for manufacturing a protecting film of a recording information disk. A magnetic film for recording information is manufactured on a surface of a substrate, and continuously, a protecting film is made on the magnetic film. The manufacturing temperature for the protecting film is higher than the manufacturing temperature for the magnetic film. After the magnetic film is made, the substrate is heated so as to approach the temperature for making the protecting film.

The fourth Taiwan patent, numbered 553828, is a method for sticking a film. A pressing roller rolls over a film on a substrate so as to that the film sticks on the substrate. The pressing roller is capable of maintaining the film in a certain status, that is, an outer circumference surface of the pressing roller maintains a front, sticky portion of the film. The pressing roller is continuously rotated to deliver the film to the substrate so as to that the front portion is exactly positioned for adherence on the substrate. A rear, sticky portion of the film may be kept by the outer circumference surface as well. Therefore, the pressing roller completely sticks the front portion to the rear portion of the film on the substrate.

Above prior art may cooperate with expensive equipment or require pre-processing. Thus, it is obvious that the cost cannot be low and that complicated procedures certainly increase the difficulty and the possibility of fault.

SUMMARY OF THE INVENTION

The present invention relates to a method to improve properties of film. The first objective of the present invention is to prevent waste of the material, which resulted from cracks, snaps and bends of the film in the process.

The present invention relates to a method to improve properties of film. The second objective of the present invention is to offer a method having low practice costs and not requiring additional expensive apparatus or treatment for a simplified procedure of the method.

The present invention relates to a method to improve properties of a film including a release film and a protective film. The protective film is bonded with a TAC (Triacetyl Cellulose) film after separating from the release film. The bonded TAC film is processed by coating, such as with an anti-reflecting coating, an anti-glaring coating or a surface hardening treatment, and by drying in an oven. Then, the protective film is separated from the TAC film.

Other and further features, advantages and benefits of the invention will become apparent in the following description taken in conjunction with the following drawings. It is to be understood that the foregoing general description and following detailed description are exemplary and explanatory but are not to be restrictive of the invention. The accompanying drawings are incorporated in and constitute a part of this application and, together with the description, serve to explain the principles of the invention in general terms. Like numerals refer to like parts throughout the disclosure.

DETAILED DESCRIPTION OF THE PREFFERED EMBODIMENT

FIG. 1relates to a process diagram of the present invention. The process broadly comprises three stages: film bonding (steps111˜116), coating (steps117˜122) and film separating (steps123˜126).

FIG. 2, presents a bonding stage of the process (steps111˜116inFIG. 1) for a TAC (Triacetyl Cellulose) film and a protective film of the present invention. A film201is used including a release film and a protective film having a gluey face (step111inFIG. 1). In practice, film could be formed from PE (polyethylene). However, PET (polyenthylene Terephthalate) can also be used instead of PE. The film201rolled on a roller (step112inFIG. 1) is rolled out (step113inFIG. 1) to an oven205by assistance of rollers202,203and204. The oven205is not operated at this time.

The film201coming from the oven205is assisted by rollers206,207and208to separate a release film from the protective film. At the roller209, the release film having no gluey face is separated from the protective film (step114inFIG. 1) and gathered in a release film roller210. Parameters including an appropriate tension and rolling rates of the roller209for separating the release film from the protective film must be considered.

After separating from the release film, the protective film is bonded with a TAC film213by rollers211and212(step115inFIG. 1). A variety of parameters have to be considered in this step, including the tension, the rolling rates, bonding speeds and viscosity of glues on the protective film. Then, the bonded film214is rolled-in (step116inFIG. 1), and the bonding process is finished (steps111˜116).

FIG. 3presents a coating stage of the process (steps117˜422inFIG. 1) for providing anti-reflecting, anti-glaring and surface hardening. The bonded film301(bonded film214ofFIG. 2) including the protective film and the TAC film213is rolled-out (step117inFIG. 1) by a roller302and processed by coating, such as with an anti-reflecting coating, an anti-glaring coating or a surface hardening treatment (step118inFIG. 1). Parameters including the tension, coating speeds and drying temperatures have to be considered in the coating process. A variety of coating types and TAC film thickness are adopted in the present invention. An oven305is switched on (step119inFIG. 1) after coating of the film. The TAC film301is dried in the oven305by functioning of rollers303and304(step120inFIG. 1). The dried TAC film309is rolled-in after directing by rollers306,307and308(step121inFIG. 1). The oven305is switched off after rolling-in (step122inFIG. 1), and the coating stage of the process is finished (steps117˜122).

FIG. 4presents a separating stage of the process (steps123˜126inFIG. 1). The TAC film401(TAC film309ofFIG. 3) is rolled-out (step123inFIG. 1) and directed into a oven405by functioning of rollers402,403and404. The oven405is switched off at this moment. By functioning of rollers406,407and408, the TAC film401is directed for the separating process.

While the TAC film401passes between a roller409and a roller410, the protective film is separated from the TAC film (step124inFIG. 1) and gathered in a protective film roller411. Parameters including an appropriate tension and rolling rates of the roller for separating the protective film from the TAC film401must be considered. The separated TAC film is gathered in a TAC film roller412(step125inFIG. 1), and the separating process is finished (steps123˜126).

The present invention prevents waste of material, which resulted from cracks, snaps and bends in the film in the process. Furthermore, practice costs are low, and additional expensive apparatus or treatments are not necessary for a simplified procedure of the method.