KR100909017B1 - Method for manufacturing interior materials of vehicle - Google Patents

Abstract

A method for manufacturing interior materials of a vehicle is provided to prevent droop or crumple of film by coming off film by vacuum pressure between an upper and lower space in advance. A method for manufacturing interior materials of a vehicle comprises a step of mounting an injection molded product(10) to a jig(130) arranged on the lower space of a molding device(100) and placing film(20) on which adhesive is sprayed between an upper and lower space; a step of raising the inside of film more high than the edge by forming a lower space with more high pressure than the upper space for film not to droop; a step of temporarily attaching the top of an injection molded product on the lower surface by raising a jig; a step of adhering film on the injection molded product by forming an upper space with high pressure more than the lower space; and a step of finishing interior materials by trimming exterior part of film along the edge of an injection molded product and ejecting an injection molded product with film from a jig.

Description

Method for manufacturing interior materials of vehicle

The present invention relates to a vehicle interior material molding method, and more particularly, to a method for molding a vehicle interior material by attaching a film to the injection molded article.

In general, the vehicle interior material is composed of an injection molding inside and a film adhered to the injection molding. The film may be formed of various materials and patterns as a part of completing the appearance of the interior material.

Interior molding method according to the prior art is as follows. First, using a mold for film molding, separately forming a film of a shape corresponding to the outside of the injection molded product, and then taken out. Subsequently, the taken-out film is inserted into one inner surface of the mold for molding the interior material, and the injection molding material is injected into the other surface, and the interior material having a shape in which the film and the molded product adhere to each other is molded in the mold. Next, the finished interior materials are taken out from the mold for molding interior materials and mounted on a vehicle for use. By the way, in the conventional case, a mold for forming a film is required separately, and the process is cumbersome.

An object of the present invention is to provide a method for forming a vehicle interior material, which does not require a mold for film molding and whose process is simple.

The present invention, (a) the injection molded product is seated on the jig disposed in the lower space of the upper space and the lower space of the molding apparatus, and a film having a pressure-sensitive adhesive is applied between the upper space and the lower space, but the Fixing the edge portion of the film to install; (b) heating the film through a heating means in the molding apparatus to make the film flexible, and to form a vacuum in the upper space and the lower space, but to increase the lower space compared to the upper space so that the film does not fall down. Formulating at a pressure such that the inside of the film is lifted upward relative to the edge; (c) raising the jig to weld the upper surface of the injection molded product to the lower surface of the film; (d) changing the upper space to a higher pressure than the lower space to form a composition, and pressing the film to the injection-molded side to adhere the film; And (e) detaching the film-adhered injection product from the jig together with the film, and trimming an unnecessary outer portion of the film along the outer line of the injection product to complete the vehicle interior material. Provided is a method for molding a vehicle interior.

In addition, in the step (d), while the film is adhered to the injection-molded product, the outer portion of the film is adhered to surround the outside of the jig together. Here, before the step (a), further comprising the step of coating the outer portion of the jig with a material selected from silicon, Teflon, PP or PE, the outer portion of the film at the step (e) It is possible to easily detach from the outer side of the jig.

And, in the step (b), the lower space is formed at a higher pressure than the upper space, but the upper space can be in the range of -91 to -111 ㎪, the lower space is -90 to -110 ㎪. And, the temperature of the heating may have a range of 70 to 80 ℃.

According to the vehicle interior molding method according to the present invention, there is no need for a film forming mold, the process is simple and there is an advantage that the film adhesion of the undercut portion is possible. In addition, the vehicle interior material molding method, by pre-lifting the film through the vacuum pressure difference between the upper space and the lower space to prevent sagging or wrinkle of the film prior to the adhesive operation of the film, thereby improving the molding quality of the interior material Can be. Furthermore, when the outer part of the jig is coated with silicon, Teflon, etc., there is an advantage that the outer portion of the film adhered to the jig can be easily detached from the jig.

1 is a flowchart of a method for forming a vehicle interior according to an embodiment of the present invention. 2 to 5 are front sectional views showing steps S110 to S140 of FIG. 1, and FIG. 6 is a front sectional view showing steps S150 to S160 of FIG. 1. 7 is a front sectional view showing a step S170 of Figure 1, Figure 9 is a front sectional view showing a coating state of the jig.

Prior to the detailed description of the molding method, referring to FIG. 2, the molding apparatus 100 for molding the vehicle interior material includes a lower cover 110, an upper cover 120, a cover transfer part 121, and a jig 130. ), Jig transfer unit 131, the heating means 140, the pressure tank 150, the first vacuum tank 160, the second vacuum tank 170 and the valve unit 180.

The lower cover 110 is disposed to face each other up and down with the upper cover 120, it is possible to open and close each other. For example, the opening and closing is possible through the cover transfer part 121 for moving the upper cover 120 up and down. The interior of the molding apparatus 100 can be divided into a lower space and an upper space according to the lower cover 110 and the upper cover 120, respectively. Of course, by installing the film 20 between the lower cover 110 and the upper cover 120, the lower space and the upper space can be distinguished more clearly.

In addition, the jig 130 is installed in the lower space in the lower cover 110, the injection molded part 10 forming the body of the interior material is placed. Of course, the trademark surface of the jig 130 is manufactured to have a shape corresponding to the lower surface of the injection molded product 10. The jig 130 may be made of an epoxy resin, an aluminum material, or the like. On the other hand, the jig 130 is movable up and down by the jig transfer unit 131. The cover transfer part 121 and the jig transfer part 131 may be applied in various ways such as pneumatic or hydraulic cylinders.

On the other hand, the heating means 140 is installed inside the upper cover 120, the element for heating the film 20. The heating means 140 is available in a variety of known heating configurations.

The pressure tank 150 is a tank for pressurizing air to increase the upper space in the upper cover 120 to a specific pressure. In addition, the first vacuum tank 160 and the second vacuum tank 170 is a vacuum suction tank for forming a vacuum in the upper space in the upper cover 120 and the lower space in the lower cover 110, respectively. In addition, the valve unit 180 is a valve for selectively forming the vacuum of the first vacuum tank 160 or the pressure of the pressure tank 150 to the upper space in the upper cover 120, the first vacuum tank ( 160 is installed between the pressurized tank 150. The valve unit 180 may be a manual operation form by an operator or a form automatically controlled by receiving a signal from an external control means programmed separately.

Hereinafter, with reference to FIGS. 1 to 9 will be described in more detail with respect to the vehicle interior molding method according to an embodiment of the present invention.

First, referring to FIG. 2, the injection molded product 10 is seated on an upper portion of the jig 130 disposed in the lower space among the upper space and the lower space of the molding apparatus 100. In addition, the film 20 is installed between the upper space and the lower space, but the edge portion of the film 20 is fixed and installed between the upper space and the lower space (S110).

Such fixing may be possible by moving the upper cover 120 to the lower space side through the cover transfer part 121 to close the molding apparatus 100, in addition to the upper cover 120 and the lower cover. Of course, the fixing means (not shown) for fixing the film 20 between the 110 is available separately installed. When the film 20 is fixed as described above, as shown in FIGS. 2 and 3, the inner portion of the film 20 except for the edge portion of the film 20 exists in a floating state in the air. On the other hand, an adhesive for sticking to the upper surface of the injection molded product 10 is applied to the lower surface of the film 20.

The film 20 is selectively used among ABS (acrylonitrile butadiene styrene), PP (polypropylene), PE (polyethylene), PU (polyurethane), acrylic, wood film, black carbon film, silver carbon film material It is possible. The upper surface of the film 20 may be formed of a separate pattern, pattern, etc. to beautifully appearance.

Next, after the injection and film installation step (S110), referring to Figures 3 and 4, while heating the film 20 through the heating means 140, at the same time the upper space and the lower space The composition of the vacuum but the film 20 is lowered to a lower pressure than the upper space to prevent the film 20 from falling down, so that the inside of the film 20 to be lifted upward compared to the edge portion (S120 ~) S130).

That is, after the injection molding product 10 and the film 20 installation step (S110), the adhesive is sufficiently softened by heating the film 20 to flexibly (flexibly) the surface of the film 20. Be prepared to be good. Here, when the film 20 is sufficiently flexible, the adhesion efficiency to each part may be increased even for the injection-molded product 10 having complex grooves and protrusions such as ribs formed on the surface thereof. There is an advantage.

Here, the heating temperature of the film 20 is applicable to the 70 to 80 ℃ range. When the film 20 is heated to a temperature of 70 ° C. or less, there is a problem that the film 20 may not be properly adhered because the flexibility of the film 20 may be inferior and the adhesive may not be softened sufficiently. In addition, when the film 20 is heated to a temperature of 80 ° C. or more, the film 20 may be carbonized by heat to increase the defective rate. Here, the heating time of the film 20 may be applied to 50 to 60 seconds, of course, if less than 50 seconds, the flexibility of the film 20 is inferior, if more than 60 seconds, the film 20 may be torn or carbonized.

An example of the vacuum pressure difference composition S130 that proceeds simultaneously with this heating process is as follows. This vacuum pressure difference composition is made by adjusting the vacuum pressure of the first vacuum tank 160 and the second vacuum tank 170, respectively. That is, the lower space is formed at a higher pressure than the upper space, and the upper space is formed at -91 to -111 kPa through the first vacuum tank 160, and the lower space is formed in the second vacuum tank ( 170) to have a range of -90 to -110 kPa.

For example, when the upper space is -99 kPa, the lower space is -98 kPa, and each of the upper spaces is adjusted to have a pressure difference of 1 kPa, the upper space is formed in a vacuum more than that of the lower space. The film 20 can be raised upward. When the film 20 is lifted upward in this way, the film 20 can be prepared by unfolding without wrinkling or sagging. On the other hand, when a pressure lower than -111 kPa, that is, more vacuum, is applied to the upper space, there is a disadvantage in that power is wasted due to excessive operation of the vacuum. Of course, the pressure difference between the upper space and the lower space should be adjusted to the extent that the film 20 is not torn or damaged.

Thus, by preparing a vacuum pressure difference between the upper space and the lower space in advance so that the film 20 is lifted upward, it is possible to prevent the film 20 from sagging or wrinkling before sticking to the film 20. It can thereby improve the quality of the interior material to be molded.

On the other hand, after the film unfolding (S130) through the heating and vacuum pressure difference composition, referring to Figure 5, by raising the jig 130, the upper surface of the injection-molded product 10 is in contact with the lower surface of the film 20 Prepare (S140). Of course, even at this time, the heating operation of the film 20 of the heating means 140 is continuously maintained. This temporary welding step (S140) is to increase the efficiency of the overall adhesion to the surface of the injection-molded product 10 as a step of preparing a later adhesion step (S150).

Next, referring to FIG. 6, the upper space is changed to a higher pressure than the lower space, and the composition is pressed by pressing the film 20 toward the injection-molded product 10 (S150). At this time, the vacuum operation of the first vacuum tank 160 is interrupted according to the control of the valve unit 180, the pressurization of the pressure tank 150 is performed or the external atmospheric pressure is acted on the upper space side. In order for the atmospheric pressure to act, the pressure tank 150 is not connected to the valve unit 180, and the port is directly opened to the outside air. That is, the valve unit 180, while there is no portion of the pressure tank 150, while opening the corresponding port directly to the outside air while blocking the first vacuum tank 160, toward the upper space side An external atmospheric pressure may be introduced to press the film 20 downward.

For example, by the second vacuum tank 170, the lower space is maintained at a vacuum of the pressure (ex, -98 kPa) of -90 to -110 kPa, and the upper space is 1 atm (101.325 kPa). Atmospheric pressure) or higher. Here, the pressure greater than the atmospheric pressure, it is possible through the pressure tank 150. Thus, by adhering the film 20 through atmospheric pressure or higher pressure, the film 20 can be easily adhered to the undercut portion of the injection molded product 10.

In this process, while maintaining the pressure state (ex, upper space: 1 atm, lower space: -98 kPa) of the upper space and the lower space performed during the film adhesion of the step S150 in a predetermined time as the injection molded product 10 The film 20 is cooled (S160). That is, the injection molded product 10 is naturally cooled by the pressurization of the air coming from the upper space. Here, the predetermined time for which the cooling is maintained, the time is 60 to 90 seconds is applicable. If less than 60 seconds, there is a disadvantage in that the film 20 is not sufficiently cooled, and thus the surface of the film 20 may be damaged when the film 20 is later detached from the jig 130. In addition, when 90 seconds or more, the injection molded product 10 and the film 20 are hardened or shrunk and the injection molded product 10 is caught in the jig 130 when the injection molded product 10 is detached from the jig 130. There is a disadvantage that it is not good demoulding. Of course, the heating operation of the heating means 140 is not performed during the cooling.

On the other hand, after the cooling step (S160), referring to Figure 7, the film 20 is adhered to the injection molded product 10, from the jig 130 together with the film 20, and also Referring to Figure 8, along the outer line of the injection molded product 10 by trimming the unnecessary outer portion of the film 20 to complete the vehicle interior (S170). The trimming may be performed manually by an operator or automatically by a separate machine.

By the way, referring to Figure 6, during the film adhesion step (S150), while the film 20 is adhered to the injection molded product 10, the outer portion of the film 20 is the outer portion of the jig 130 Stick to wrap together. In this state, when the desorption process of FIG. 7 is performed, the outer part of the film 20 may not be detached well on the outer side of the jig 130, and thus desorption may be difficult. In addition, in such a detachment process, not only the outer portion of the film 20 but also the film portion surrounding the injection molded product 10 may be torn or damaged together.

Therefore, referring to FIG. 9, before the injection molded product installing step S110, the outer portion of the jig 130 is coated with a coating material 30 made of one selected from silicon, teflon, PP, or PE. . The coating material 30 is a viscous liquid form can be applied by brushing, printing, spraying or the like. In addition, the thickness of the coating material 30 may have a range of 0.1 to 1 mm. When the thickness is 0.1 mm or less, the thickness thereof is minute, so that the coating work is difficult, and it cannot be effectively applied to detach the outer portion of the film 20. In addition, when the thickness is 1 mm or more, the material is wasted, and the film 20 has a disadvantage of being lifted by the thickness of the coating material 30. On the other hand, according to the coating material 30, during the injection part detachment step (S160) of Figure 7, the outer portion of the film 20 can be more easily detached from the outer portion of the jig 130, thereby forming It can improve the quality of the interior material.

Although the present invention has been described with reference to the embodiments shown in the drawings, these are merely exemplary and will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

1 is a flowchart of a method for forming a vehicle interior according to an embodiment of the present invention;

Figure 2 is a front sectional view showing the injection molding product and the film installation step of Figure 1,

3 is a front sectional view of the heating and vacuum composition step of FIG.

Figure 4 is a front sectional view of the film unfolding step using the vacuum pressure difference of Figure 1,

5 is a front sectional view showing a film welding step of the injection molded product of FIG. 1;

6 is a front sectional view showing a film adhesion step to the injection molding step cooling step of Figure 1,

7 and 8 are front cross-sectional view showing the step of desorption and film trimming the injection product of Figure 1,

9 is a front sectional view showing the coating state of the jig.

<Description of Symbols for Main Parts of Drawings>

10: injection molded product 20: film

30: coating material 100: molding apparatus

110: lower cover 120: upper cover

121: cover transfer unit 130: jig

131: jig transfer unit 140: heating means

150: pressurized tank 160: first vacuum tank

170: second vacuum tank 180: valve portion

Claims (5)

(a) coating the outer side of the jig with a material selected from silicon, teflon, PP or PE; (b) the injection molded product is seated on the jig disposed in the lower space of the upper space and the lower space of the molding apparatus, and a film having an adhesive applied on a lower surface is installed between the upper space and the lower space, and the edge of the film Fixing and installing the part; (c) heating the film to a range of 70 to 80 ° C. through a heating means in the molding apparatus to make the film flexible, and vacuum the upper space and the lower space, but the film is lowered prior to the sticking operation of the film. The upper space is -91 to -111 kPa, and the lower space is -90 to -110 kPa so that the lower space has a higher pressure than the upper space to prevent sagging or wrinkling. Allowing the inside to be lifted upward relative to the edge; (d) raising the jig to weld the upper surface of the injection molded product to the lower surface of the film; (e) changing the upper space to a higher pressure than the lower space, while maintaining the lower space at a pressure of -90 to -110 kPa and changing the upper space to 1 atm or more; Pressing the film toward the injection-molded product and adhering the film to the injection-molded product so that an outer portion of the film wraps together with an outer part of the jig; (f) cooling the injection-molded product and the film while maintaining each pressure state of the upper space and the lower space performed during the film adhesion for 60 seconds to 90 seconds; And (g) detaching the film-adhered injection product from the jig together with the film, by coating the outer side of the jig in the step (a), so that the film does not tear or damage during the detachment And an outer portion of the jig easily detached from the outer portion of the jig, and trimming the outer portion, which is an unnecessary portion of the film, along the outer line of the injection molded product, to complete the vehicle interior. delete delete delete delete

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