KR101268679B1 - Transcription film for in-mold and method of manufacturing the transcription film for in-mold by silk screen process - Google Patents

Abstract

Disclosed is a method for manufacturing an in-mold transfer film capable of realizing a three-dimensional texture of various patterns without changing a design of a vacuum mold by forming a release layer using a silk screen method.
In-mold transfer film manufacturing method that can realize a three-dimensional texture of a variety of patterns through the silk screen method according to the present invention comprises the steps of forming a release layer on top of the base layer using a silk screen; Forming a hard coating layer on top of the release layer; Forming a printing layer on top of the hard coating layer; Forming a primer layer on the printed layer; And forming an adhesive layer on the primer layer.

Description

TRANSCRIPTION FILM FOR IN-MOLD AND METHOD OF MANUFACTURING THE TRANSCRIPTION FILM FOR IN-MOLD BY SILK SCREEN PROCESS}

The present invention relates to a method for manufacturing an in-mold transfer film, and more specifically, to forming a release coating layer by a silk screen method, an in-mold transfer film capable of realizing a three-dimensional texture of various patterns without changing the design of a vacuum mold, and its manufacture It is about a method.

Recently, with the development of technology, various electric and electronic products are continuously appearing, and representatively, mobile communication terminals such as mobile phones have become one of the necessities of life as the number of users increases exponentially. In addition, notebooks, electronic notebooks, MP3, PDA, navigation, etc. are becoming smaller and more portable as the user is increasingly increasing.

On the other hand, in order to satisfy the taste of the young generation, which is the main consumer, electric and electronic products, various attempts have been made not only for its functionality but also for the aesthetics that are seen from the outside, that is, the colors and designs. As one of these attempts, recently, injection moldings, which are final products, have been manufactured through simultaneous injection using an in-mold transfer film.

However, the conventional in-mold transfer film can only implement a flat pattern, and in order to realize a three-dimensional pattern, the vacuum mold must be changed in design. In this case, the vacuum mold must be changed in design or additional vacuum mold must be manufactured. There is a problem of rising costs.

One object of the present invention is to provide a transfer film manufacturing method for an insert mold that can implement a variety of three-dimensional texture without changing the design of the vacuum mold.

Another object of the present invention to provide a transfer film for in-mold produced by the manufacturing method.

In-mold transfer film manufacturing method that can realize a three-dimensional texture of a variety of patterns through the silk screen method according to an embodiment of the present invention for achieving the above object to form a release layer on the base layer using a silk screen Making; Forming a hard coating layer on top of the release layer; Forming a printing layer on top of the hard coating layer; Forming a primer layer on the printed layer; And forming an adhesive layer on the primer layer.

In-mold transfer film that can realize a three-dimensional texture of various patterns through the silk screen method according to an embodiment of the present invention for achieving the above another object is a base layer, release layer, hard coating layer, printing layer, primer layer and Including an adhesive layer, the release layer is characterized in that formed by a thickness of 2 ~ 7㎛ by the silk screen method.

Since the release layer is formed by the silk screen method of the in-mold transfer film according to the present invention, it is easy to implement various three-dimensional pattern on the surface of the release layer formed on the base layer, which is formed on the surface of the release layer. By the three-dimensional pattern, the printing pattern of the printed layer formed on the upper side of the release layer can be three-dimensionally survived without changing the design of the vacuum mold.

1 is a cross-sectional view showing an in-mold transfer film according to an embodiment of the present invention.
2 is a process flowchart showing a method for manufacturing an in-mold transfer film according to an embodiment of the present invention.
Figure 3 is a schematic process diagram showing the release layer forming step according to an embodiment of the present invention.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. It should be understood, however, that the invention is not limited to the disclosed embodiments, but is capable of many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

Hereinafter, an in-mold transfer film and a method of manufacturing the same may be described with reference to the accompanying drawings that can realize a three-dimensional texture of various patterns through a silk screen method according to an embodiment of the present invention.

1 is a cross-sectional view showing an in-mold transfer film according to an embodiment of the present invention.

Referring to Figure 1, the in-mold transfer film 100 according to an embodiment of the present invention is a base layer 110, a release layer 120, a hard coating layer 130, a printing layer 140, a primer layer 150 And an adhesive layer 160.

The base layer 110 may be formed of at least one material selected from polyethylene terephthalate (PET), polycarbonate (PC), polypropylene (PP), and acrylic.

The release layer 120 is formed on the base layer 110, and manufactured an injection molding (not shown) manufactured by injection molding molten resin in a state where the in-mold transfer film 100 is inserted into an injection mold. After that, it is formed for the purpose of removing the base layer 110 from the injection molding, in particular, the release layer 120 according to an embodiment of the present invention is the base layer 110 through a silk screen process (silk screen process) Characterized in that formed on top of.

The release layer 120 may be formed of one or more materials selected from epoxy, epoxy-melamine, aminoalkyd, acrylic, melamine, silicone, fluorine, cellulose, urea resin, polyolefin, and paraffin.

At this time, the thickness of the release layer 120 is preferably formed to 2 ~ 7㎛. If the thickness of the release layer 120 is less than 2 μm, it may be difficult to realize a three-dimensional texture in the printing layer 140 to be formed on the upper side of the release layer 120 because the thickness is too thin. When the thickness of the release layer 120 exceeds 7 μm, there is a problem of causing unpeeling during injection due to the time-dependent change due to the uncured release agent.

As such, when the release layer 120 is formed by using the silk screen method, not only the amount of release agent composition can be easily adjusted, but also the three-dimensional pattern of various patterns can be realized by changing the size and design of the silk screen net. This will be described later.

The hard coating layer 130 is formed for the purpose of preventing scratches in the print layer 150 to be described later during injection molding.

The hard coating layer 130 may use at least one of acrylic, urethane, epoxy, and siloxane polymer materials, and may also use an ultraviolet curable resin such as an oligomer. In addition, the hard coating layer 130 may further include a silica-based filler to improve the strength.

At this time, the hard coating layer 130 may be formed to a thickness of 4 ~ 8㎛. If the thickness of the hard coating layer 130 is less than 4㎛ the scratch prevention effect may be insignificant, on the contrary, if the thickness of the hard coating layer 130 exceeds 8㎛ cracks during injection due to the elongation of the film decreases And a powder generation due to brittle may cause a problem of injection failure.

The print layer 140 may be formed by using either gravure printing or flexographic printing. The print layer 140 may have the same or different patterns, and may freely implement a portrait photograph, a pattern, various colors, various patterns, and the like in a desired form.

The primer layer 150 is interposed between the print layer 140 and the adhesive layer 160 to be described later to reinforce the adhesive force of the adhesive layer 160.

The primer layer 150 may include a urethane resin or a modified acrylic resin as a main component or a polyisocyanate and a polyol as a main component, and more specifically, a polyester polyol, polyisocyanate, modified acrylic, metal oxide fine particles and a curing catalyst. It is preferable to form at least 1 sort (s) selected from these.

The adhesive layer 160 is one selected from gravure printing, flexographic printing, micro gravure coating, comma coating, and roll coating adhesive such as polyester, polyurethane, acrylic, ethylene co-vinyl acetate (EVA) and polyvinyl acetate (PVAc). It can be formed by applying to a suitable thickness using the above method, and then curing at a constant temperature.

As described above, when the release layer is formed by the silk screen method, such as an in-mold transfer film, the amount of the release agent composition can be easily adjusted to enable precise coating, thereby controlling the thickness of the release layer formed on the base layer. It may be easy to implement a three-dimensional pattern. As a result, when the printed layer is formed on the upper side of the three-dimensional pattern formed on the surface of the release layer, the three-dimensional pattern is transferred to the printed layer as it is, it is possible to implement a differentiated three-dimensional texture of various patterns without changing the design of the vacuum mold Become.

This will be described in more detail based on the method of manufacturing an in-mold transfer film for realizing a three-dimensional texture of various patterns through the silk screen method according to an embodiment of the present invention with reference to the accompanying drawings.

FIG. 2 is a process flowchart showing a method for manufacturing an in-mold transfer film according to an embodiment of the present invention, and FIG. 3 is a schematic view showing a process of forming a release layer according to an embodiment of the present invention.

2 and 3, in-mold transfer film manufacturing method according to an embodiment of the present invention release layer forming step (S110), hard coating layer forming step (S120), printing layer forming step (S130), primer layer formation A step S140 and an adhesive layer forming step S150 are included.

In the release layer forming step (S110), after the silk screen 125 is mounted on an upper portion of the stage 105 spaced apart from the base layer 110, the release agent composition is spaced apart from the silk screen 125. A predetermined amount of the release agent composition 122 is dripped on the surface of the silk screen 125 using the nozzle 142 of the storage tank 145 in the state which arrange | positioned the storage tank 145 to which 122 is supplied.

At this time, the silk screen 125 is aligned with the base layer 110 by the holder 155 for controlling its vertical and horizontal movements.

Here, the release agent composition 122 is formed of at least one selected from epoxy, epoxy-melamine, amino alkyd, acrylic, melamine, silicone, fluorine, cellulose, urea resin, polyolefin and paraffin. desirable.

At this time, the release agent composition 122 is preferably adjusted to have a viscosity of 100 ~ 6000cP. If the viscosity of the release agent composition 122 is less than 100 cP, it may be difficult to coat the surface due to the problem that the viscosity is too low to flow down. On the contrary, if the viscosity of the release agent composition 122 exceeds 6000 cP, the viscosity may be high. It may be too high to easily solidify and have difficulty passing through the silk screen 125 and may cause defects such as nozzle clogs.

Next, the release agent composition 122 dropped on the surface of the silk screen 125 is pushed into the net of the silk screen 125 using the squeeze 135 so that the release agent composition is applied on the upper portion of the base layer 110. To form a release agent coating layer (not shown).

At this time, when the mold release agent composition 122 is pushed into the web of the silk screen 125, it is preferable to perform squeeze pressurization at a pressure of 1 to 5 kg / cm² and to move the squeeze at a speed of 2 to 7 cm / sec. .

If the squeeze pressurization is performed at less than 1 kg / cm², it may be difficult to push the release agent composition 122 into the web of the silk screen 125. On the contrary, if the squeeze pressurization exceeds 5 kg / cm². There is a problem that the pressure of the squeeze is too high may cause damage to the silk screen (125).

In addition, if the squeeze movement speed is less than 2cm / sec, the process yield may be reduced because the movement speed is too slow, on the contrary, if the squeeze movement speed exceeds 7cm / sec, the movement speed is too fast Difficulties in uniformly dispersing the release agent composition 122 on the surface of the silk screen 125 may be followed.

Next, after removing the silk screen mounted on the upper portion of the base layer 110, by releasing the release agent coating layer applied to the entire upper surface of the base layer 110 at 60 ~ 120 ℃ for 15-30 seconds release layer ( 120 of FIG. 1 may be formed. Here, the release agent coating layer may be cured using one or more of heat, UV and IR.

At this time, the thickness of the release layer is preferably formed to 2 ~ 7㎛. If the thickness of the release layer is less than 2 μm, it may be difficult to implement a three-dimensional texture in the printing layer (140 of FIG. 1) formed on the upper side of the release layer because the thickness is too thin. If it exceeds 7㎛ there is a problem causing un-peeled during injection due to the change over time due to the uncured release agent.

Meanwhile, referring to FIGS. 1 and 2, in the hard coating layer forming step (S120), a hard coating material layer is coated on the release layer 120 to a thickness of 4 μm to 8 μm to form a hard coating material layer (not shown). Then, the hard coating material layer is cured at a temperature of 140 ~ 170 ℃ in a drying furnace to form a hard coating layer (130).

The hard coating layer 130 may use at least one of acrylic, urethane, epoxy, and siloxane polymer materials, and may also use an ultraviolet curable resin such as an oligomer. In addition, the hard coating layer 130 may further include a silica-based filler to improve the strength.

At this time, the hard coating layer 130 may be formed to a thickness of 4 ~ 8㎛. If the thickness of the hard coating layer 130 is less than 4㎛ the scratch prevention effect may be insignificant, on the contrary, if the thickness of the hard coating layer 130 exceeds the thickness of 8㎛ cracks during injection due to elongation of the film ( Powder generation due to cracks and brittles may cause problems of injection failure.

In the printing layer forming step (S130), the printed layer 140 is formed on the hard coating layer 130 using either gravure printing or flexographic printing. Since the print layer 140 has the same or different patterns, it is possible to freely implement portraits, patterns, various colors, various patterns, and the like in a desired form.

In the primer layer forming step (S140), the primer layer 150 is formed on the hard coating layer 130 and the printing layer 140 by deposition or coating. The primer layer 150 may include a urethane resin or a modified acrylic resin as a main component or a polyisocyanate and a polyol as a main component, and more specifically, a polyester polyol, polyisocyanate, modified acrylic, metal oxide fine particles and a curing catalyst. It is preferable to form by 1 or more types selected from among.

In the adhesive layer forming step (S150), the adhesive layer 160 is formed to a thickness of 1 μm to 3 μm on the primer layer 150 using at least one selected from gravure printing, flexo printing, micro gravure coating, and roll coating. . The adhesive layer 160 may be an adhesive such as polyester, polyurethane, acrylic, EVA (ethylene co-vinyl acetate), PVAc (polyvinyl acetate), or the like.

As described above, it is possible to manufacture a transfer film for in-mold, which can realize a three-dimensional texture of various patterns through silk screen printing according to an embodiment of the present invention.

As described above, since the release layer is formed by the silk screen method of the in-mold transfer film manufactured by the manufacturing method as described above, the surface of the release layer is formed on the base layer. It is easy to implement a variety of three-dimensional pattern, the three-dimensional pattern formed on the surface of the release layer has the effect that the printed pattern of the printing layer formed on the upper side of the release layer can be three-dimensional survive without changing the design of the vacuum mold. .

Example

Hereinafter, the configuration and operation of the present invention through the preferred embodiment of the present invention will be described in more detail. It is to be understood, however, that the same is by way of illustration and example only and is not to be construed in a limiting sense.

Details that are not described herein will be omitted since those skilled in the art can sufficiently infer technically.

1. Insert Mold  Transcription Film Manufacturing

Example 1

After the silk screen was mounted on the 50 μm thick PET film seated on the top of the stage, the release agent composition was added dropwise to the silk screen surface by using a nozzle of a storage tank in which an acrylic release agent composition having a viscosity of 1000 cps was stored. The loaded release agent composition was squeezed into a web of silk screen at a speed of 4 cm / sec and a pressure of 25 kg / cm² to apply a release agent composition to a thickness of 4 μm on top of the PET film to form a release agent coating layer. .

Then, after removing the silk screen mounted on top of the PET film, the release agent coating layer applied to the upper front of the PET film was cured at 100 ℃ for 45 seconds to form a release layer and then aged at 50 ℃ for 24 hours or more.

Thereafter, a hard coating layer was formed to a thickness of 6 μm by a gravure coating method on the upper part of the release layer, and then an in-mold transfer film was manufactured by sequentially forming a printing layer, a primer layer, and an adhesive layer on the hard coating layer.

Comparative Example 1

An in-mold transfer film was manufactured in the same manner as in Example 1 except that the release layer was formed to a thickness of 0.5 μm.

Comparative Example 2

A transfer film for insert mold was prepared in the same manner as in Example 1 except that the release layer was formed to a thickness of 9 μm.

2. Property evaluation

Table 1 shows the results of the physical property evaluation for the transfer film for insert mold according to Example 1 and Comparative Examples 1, 2.

[Table 1]

Referring to Table 1, in the case of Example 1, the release force is good, it can be seen that the three-dimensional texture shows excellent characteristics.

On the other hand, in the case of Comparative Example 1, the release force was good, the three-dimensional texture was normal, and in Comparative Example 2 it can be seen that the release force is heavy and the PET is unpeeled as it bursts.

Based on the above experimental results, when the release layer was formed by the silk screen method, it was confirmed that the three-dimensional texture effect aesthetically maintained while the release force was maintained at a level higher than normal.

Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. These changes and modifications may be made without departing from the scope of the present invention. Accordingly, the scope of the present invention should be determined by the following claims.

100: in-mold transfer film 110: base material layer
120: release layer 130: hard coating layer
140: printed layer 150: primer layer
160: adhesive layer

Claims (13)

Forming a release layer on top of the substrate layer using a silk screen;
Forming a hard coating layer on top of the release layer;
Forming a printing layer on top of the hard coating layer;
Forming a primer layer on the printed layer; And
Forming an adhesive layer on the primer layer;
The release layer forming step
Mounting a silk screen on top of the substrate layer spaced apart;
Applying a release agent composition to the surface of the silk screen;
Manufacturing the transfer film for in-mold comprising the step of performing a squeeze pressurized at a pressure of 1 ~ 5kg / cm ² so that the applied release agent composition passes through the net of the silk screen, the coating on top of the base layer Way.
delete delete The method of claim 1,
The squeeze movement speed
In-mold transfer film manufacturing method characterized in that carried out at 2 ~ 7cm / sec.
The method of claim 1,
After the coating step,
Removing the silk screen mounted on top of the base layer;
In-mold transfer film manufacturing method characterized in that it further comprises the step of curing the coated release agent composition.
The method of claim 5,
The curing step
A method of manufacturing an in-mold transfer film, characterized in that it uses at least one of heat, UV and IR.
The method of claim 5,
In the curing step,
Curing temperature: 60 to 120 ℃ curing time: in-mold transfer film production method characterized in that carried out for 15 to 30 seconds.
The method of claim 1,
The primer layer
A method for producing an in-mold transfer film, characterized in that it is formed of at least one selected from polyester polyols, polyisocyanates, modified acrylics, fine metal oxide particles and a curing catalyst.
The method of claim 1,
The release agent composition is
Method for producing an in-mold transfer film, characterized in that formed by at least one selected from epoxy, epoxy-melamine, amino alkyd, acrylic, melamine, silicone, fluorine, cellulose, urea resin, polyolefin-based and paraffin-based .
10. The method of claim 9,
The viscosity of the release agent composition is
In-mold transfer film manufacturing method characterized in that 100 ~ 6000cP.
It includes a base layer, a release layer, a hard coating layer, a printing layer, a primer layer and an adhesive layer from above,
The release layer is an in-mold transfer film, characterized in that formed by a thickness of 2 ~ 7㎛ by the silk screen method.
The method of claim 11,
The thickness of the hard coating layer is
In-mold transfer film, characterized in that 4 ~ 8㎛.
The method of claim 11,
The primer layer
In-mold transfer film, characterized in that formed of at least one selected from polyester polyol, polyisocyanate, modified acrylic, metal oxide fine particles and a curing catalyst.

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