JP4610952B2 - Method for forming skin on core material and automobile interior parts - Google Patents

Description

  The present invention relates to a method of coating the skin of an automobile interior product, and particularly to a method of coating a soft skin.

  The instrument panel is manufactured by forming a skin on the core, and the skin is painted in two colors or more. As a method for coating the skin, a first method and a second method described below can be considered.

  First, in the first method, a core material is set in one molding die, a skin is set in the other molding die, these molding dies are closed, and a foamed resin is formed between the core material and the skin. It is a method of painting on a resin molding. In such a coating method, a coating method is disclosed in which the coated part of the skin is exposed and a mask jig is attached to a part where the skin is not painted, and then the skin is painted, whereby the parting appearance is improved (for example, patents) Reference 1).

  However, in such a method, in order to easily remove unnecessary foamed resin, a mold release agent is often applied to the mold or the core material, and the mold release agent is likely to adhere to the skin. In addition, the sweat of the operator's hand is likely to adhere to the epidermis. Therefore, it is necessary to remove the release agent and sweat adhering to the epidermis before coating the epidermis. This not only takes time, but also causes complaints if the release agent cannot be completely removed. Therefore, the second method of forming a pre-painted skin on the core is often employed.

JP 11-197590 A

  However, in the second method, since the skin is soft, it is difficult to attach a mask jig to a portion where the skin is not painted. Therefore, this is dealt with by applying a masking tape to the non-painted portion of the skin, but there is a problem that a great number of man-hours are required.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a method for coating a skin that can easily attach a flexible skin to a mask jig in a short time.

Means and effects for solving the problems

In the present invention, the following features are provided alone or in combination as appropriate. A method of coating a skin according to the present invention for solving the above-described problem is a method of coating the skin in an instrument panel having a skin having a coating portion, and a step of forming a flexible skin by slush molding or vacuum molding And a step of bringing the skin into close contact with the shape-retaining member, a step of covering an unpainted portion of the skin in the close contact state with a mask jig, and a step of coating in a state of being covered with the mask jig. And, the shape of the outer surface of the shape holding member is formed to be substantially the same as the shape of the inner surface of the epidermis, and in the contacting step, the epidermis is over the almost entire area of the inner surface. In the step of covering and covering the outer surface of the shape holding member, the mask jig is set against the skin whose shape is held by the shape holding member. And wherein the Tosuru.

  Here, “a part that is not painted” does not mean only a part that is not painted out of the epidermis having a part that is painted and a part that is not painted, but also includes a part that is not painted in the series of steps described above. For example, in the case where two or more colors are painted by performing the above-described example process a plurality of times, a portion that is painted in the second and subsequent steps corresponds to a portion that is not painted in the first step.

According to this, since the flexible skin is in close contact with the shape holding member, the shape of the skin along the instrument panel is maintained. Therefore, the mask jig can be easily and quickly attached to the skin. Moreover, since the unpainted portion is covered with a mask jig, a parting line for painting can be secured and the finish of painting is excellent. Further, according to this, since the slush-molded or vacuum-formed skin is difficult to maintain the shape, the present coating method is suitably applied.

  In the skin coating method according to the present invention, it is preferable that the shape holding member is a mold substantially the same as the skin shape, and is a mold in which suction holes for sucking air and closely contacting the skin are opened on the surface.

  According to this, since the epidermis is brought into close contact along the same mold as the epidermal shape, the epidermal shape can be accurately maintained.

  Hereafter, each process (step) is demonstrated in order, referring FIG. 1 about the example of suitable embodiment of the coating method of the outer skin in the instrument panel which concerns on this invention. In addition, the coating to the coating part of an outer skin is performed after covering and fixing a flexible outer skin on a holding | maintenance model.

  FIG. 1 is a view showing an aspect in which the skin 1 is held by the holding model 2. The skin 1 has a coating portion 3 having a parting line 9 as a boundary portion and a portion 4 that is not painted. In the present embodiment, first, the skin 1 of the instrument panel shown in FIG. 1 is formed.

(Skin formation process)
The formation of the instrument panel skin 1 shown in FIG. 1 is generally performed by slush molding or vacuum molding. Below, the process of forming the skin 1 by slush molding will be described, and subsequently, the process of forming the skin 1 by vacuum forming will be described.

  Slush molding is performed using a powder of an elastomer composition. The skin 1 is a laminate in which an outer layer and an inner layer are laminated (both the outer layer and the inner layer are not shown). The skin 1 is formed by forming an outer layer on a mold (not shown) and then forming an inner layer.

  The outer layer is formed by dropping the powder of the composition used for the outer layer into a mold heated to a temperature higher than the melting point of the composition used for the outer layer, for example, 250 ° C. Then, the mold charged with the powder is heated at 300 ° C., for example. Then, the dropped powder becomes a layer and adheres to the mold and melts with time to form an outer layer having a thickness of 0.3 to 1.0 mm. For powder that did not melt and adhere to the mold, the mold is inverted and collected. In addition, in order to give a design to an instrument panel, patterns, such as a skin-texture pattern, are formed in the type | mold.

  The inner layer is formed by dropping the powder of the composition used for the inner layer onto the outer layer formed in the mold. Then, the mold in which the powder is put on the outer layer is heated again at 230 ° C., for example. Then, the dropped powder becomes a layer and adheres to the surface of the outer layer, and melts with the passage of time to form an inner layer having a thickness of 0.7 to 1.2 mm. The powder that did not melt and adhere to the outer layer is recovered by inverting the mold. Then, for example, the mold is cooled by water cooling to remove the composite skin 1.

  In addition, the skin 1 is not restricted to the laminated body of an outer layer and an inner layer, For example, it may consist of only one layer. Moreover, it may consist of three layers.

  Here, as a mold heating method, oil circulation or a method of putting in a hot stove is common. Oil circulation is easy to adjust the mold temperature by pipe arrangement, but it is heated only from the mold surface. On the other hand, when a hot air furnace is used, heating from both sides of the mold surface and the back of the molded product is possible. However, in consideration of productivity, the hot air is often set to 300 ° C. or higher. It is necessary to consider the prescription and conditions so as not to cause oxidative deterioration.

  The hot air method is effective when powder slush molding is performed in multiple layers (2 to 3). That is, the first powder, which is the outermost layer, is slush-molded on a heated mold, the second powder is adhered in a semi-molten state, and if necessary, the third powder is slush-molded, and then heated and melted. In this case, the heating from only the mold surface side is insufficient in heat transfer, so a hot stove system that can also be heated from the back of the molded product is often used.

  The process of forming the skin 1 by slush molding has been described above, but the process by slush molding in the present embodiment is an example and is not limited to this.

  Next, the process of forming the skin 1 by vacuum forming will be briefly described. For vacuum forming, a male mold or a female mold is used, and a vacuum hole is formed in these molds. The skin material is set to either a male mold or a female mold, and the mold (that is, the skin material) is heated with a heater or the like. Then, when vacuuming is performed within 90 cmHg from the vacuum hole, the skin material adheres to the mold. While maintaining this close state, the surface of the skin material is cooled by blowing air or the like, and the skin material is demolded.

  As mentioned above, although the process of forming the skin 1 by vacuum forming was demonstrated easily, the process by vacuum forming in this embodiment is an example, Comprising: It is not restricted to this.

(Skin adhesion process)
This step is a step of bringing the skin 1 into close contact with the holding model 2. First, the shape of the holding model 2 shown in FIG. 1 will be described with reference to FIG. Then, the process of sticking the skin 1 to the holding model 2 will be described. 2 is a cross-sectional view of the holding model 2 shown in FIG.

  As shown in FIG. 2, the holding model 2 is a mold formed of a hard resin having an outer surface 2a whose shape is substantially the same as the shape of the inner surface 1a of the skin 1 of the instrument panel. The holding model 2 has a hollow portion 10 formed therein, and a large number of holes 8 communicating with the hollow portion 10 over the entire outer surface 2a. Further, a suction tube 11 made of hard resin is attached to the lower wall 2A of the holding model 2. One end 11a of the suction pipe 11 penetrates the lower wall 2A of the holding model 2 and is integrally attached to the holding model 2 by press-fitting. Further, the other end 11b of the suction tube 11 is connected to a vacuum pump (not shown).

  As shown in FIG. 1, the close contact of the skin 1 to the holding model 2 is performed by first covering the holding model 2 with the skin 1 so that the outer surface 2a of the holding model 2 and the inner surface 1a of the skin 1 are in contact with each other. The inside of the hollow portion 10 is sucked with a vacuum pump connected to the suction pipe 11. When the inside of the hollow portion 10 is made negative by suction, air existing between the skin 1 and the holding model 2 is discharged from between the skin 1 and the holding model 2 through the holes 8. Thus, when air is discharged from between the skin 1 and the holding model 2, the inner surface of the skin 1 and the outer surface 2a of the holding model 2 are brought into close contact with each other.

  Thus, when the hollow part 10 is formed inside the holding model 2 in which a large number of holes 8 are formed over the entire outer surface 2a, and the inside of the hollow part 10 is sucked, the hollow part 10 functions as a buffer. Will be fulfilled. That is, it is not sucked from the specific holes 8 but sucked from all the holes 8 without deviation. Accordingly, the inner surface 1a of the skin 1 and the outer surface 2a of the holding model 2 can be brought into close contact over almost the entire region.

  Note that the material of the holding model (shape holding member) 2 and the suction tube 11 is not limited to hard resin, and is specified if the shape of the skin 1 can be held without damaging the skin 1. is not.

  Further, when the skin 1 is covered with the holding model 2, a hole 8 is formed in a portion of the outer surface 2 a of the holding model 2 where the outer surface 2 a of the holding model 2 and the inner surface 1 a of the skin 1 do not contact each other. It does not have to be.

(Process to cover with mask jig)
This step is a step of covering the uncoated portions 4 and 5 of the skin 1 with the mask jigs 6 and 7. In the present embodiment, as shown in FIG. 1, the non-painted portions 4 and 5 of the skin 1 are separated into two portions of one non-painted portion 4 and the other non-painted portion 5. In order to mask these two separated locations, two mask jigs 6 and 7 are used.

  The first mask jig 6 has an L-shape and is set on one unpainted portion 4. The second mask jig 7 has an anti-L shape symmetrical to the first mask jig 6 and is set on the other unpainted portion 5. The mask jigs 6 and 7 have shapes in which the back surfaces 6b and 7b of the mask jigs 6 and 7 and the outer surfaces of the unpainted portions 4 and 5 of the skin 1 are in close contact with each other. In particular, at the boundary line (parting line) 9 between the coated portion 2a of the skin and the unpainted portion 2b, the back surfaces 6b and 7b of the mask jigs 6 and 7 and the surfaces of the unpainted portions 4 and 5 of the skin 1 are in close contact. It is formed to do. Furthermore, the angles of the corners 6A and 7A of the mask jigs 6 and 7 are slightly smaller than the angles of the corners 4A and 5A of the uncoated portions 4 and 5 of the skin 1, respectively. This is because when the mask jigs 6 and 7 are brought into contact with the unpainted portions 4 and 5 of the skin 1, the mask jigs 6 and 7 are set without dropping from the skin 1.

  The shape of the skin 1 that is in close contact with the holding model 2 is held by the holding model 2. Then, the first mask jig 6 is set on one non-painted portion 4 of the skin 1 and the second mask jig 7 is set on the other non-painted portion 5. At this time, since the shape of the skin 1 is held by the holding model 2, the mask jigs 6 and 7 can be easily set in the unpainted portions 4 and 5 of the skin 1, respectively. Further, since the angles of the corners 6A and 7A of the mask jigs 6 and 7 are smaller than the angles of the corners 4A and 5A of the uncoated portions 4 and 5 of the skin 1, respectively, the mask treatment set on the skin 1 is performed. The tools 6 and 7 do not fall off the epidermis 1.

(Painting process)
This step is a step of painting the surface of the skin 1 where the unpainted portions 4 and 5 are covered with the mask jigs 6 and 7.

  The skin 1 is painted using a spray can. As the spray can, one filled with a paint of a color to be applied to the coating portion 3 of the skin 1 is used. Then, the parts 4 and 5 that are in close contact with the holding model 2 and are not painted are sprayed and painted on the entire surface of the skin 1 covered with the mask jigs 6 and 7. Then, as shown in FIG. 3, the part 3 of the skin 1 that is not covered with the mask jigs 6 and 7 is painted, and the part 4 that is covered with the mask jigs 6 and 7 is not painted. The epidermis 1 is formed. FIG. 3 is a view showing the skin of the instrument panel after painting.

  In addition, since the surface of the skin 1 and the back surfaces 6b and 7b of the mask jigs 6 and 7 are in close contact with each other at the parting line 9, the parting line 9 can be secured even after painting. Therefore, the skin 1 of the instrument panel excellent in the finish of painting can be provided.

  After painting on the surface of the epidermis 1, the painted part 3 is naturally dried. In this manner, by drying the painted portion 3 of the skin 1, a coating film is formed on the painted portion 3 of the skin 1. In addition, drying is not restricted to natural drying, The aspect will not be limited if a coating film can be formed in the coating part 3 of the skin 1.

  After confirming that the coating portion 3 of the skin 1 has dried, the mask jigs 6 and 7 are removed from the skin 1 that is in close contact with the holding model 2. After removing the mask jigs 6 and 7 from the skin 1, the skin 1 is subsequently removed from the holding model 2. It can be easily removed by removing the end of the skin 1 and introducing air, or by stopping the vacuum pump. This is because air enters between the skin 1 and the holding model 2 through the hole 8 formed in the holding model 2.

  As described above, in the above-described embodiment, the step of forming the flexible skin 1, the step of bringing the skin 1 into close contact with the holding model 2, and the unpainted portions 4 and 5 of the skin 1 in close contact with the holding model 2. And the step of coating the entire surface of the skin 1 covered with the mask jigs 6 and 7 in the uncoated portions 4 and 5 of the skin 1. Therefore, the shape of the skin 1 along the instrument panel is maintained, and the mask jigs 6 and 7 can be attached to the skin 1 easily and in a short time. In particular, since the instrument panel is larger than other automobile interior parts, the effect is great when applied to an instrument panel having a flexible skin. Furthermore, since the unpainted portions 4 and 5 are covered with the mask jigs 6 and 7, the parting line 9 for painting can be secured, and it becomes possible to provide the flexible skin 1 with excellent coating finish. .

  Further, in the above-described embodiment, the holding model 2 is substantially the same type as the flexible skin 1, and the hole 8 that sucks air and closely contacts the skin 1 is opened on the surface. Therefore, the shape of the skin 1 can be accurately maintained.

  Moreover, in the above-mentioned embodiment, the skin 1 of the instrument panel is formed by slush molding or vacuum molding. Since the skin 1 formed by slush molding or vacuum molding is flexible, it is difficult to maintain the shape of the skin 1. Since it is difficult to mask the uncoated portions 4 and 5 of the flexible skin 1, a large amount of labor is required. Therefore, the present invention exerts a great effect when the slush-molded or vacuum-formed skin 1 is partially coated by applying the present invention.

  In addition, although this invention is described in said preferable embodiment, this invention is not restrict | limited only to it. Various embodiments are possible without departing from the spirit and scope of the invention. For example, in the present embodiment, a method of coating the skin 1 of the instrument panel is described, but a method of coating the skin of an automobile interior such as a door rim or a console box may be used. Although these automobile interior parts are smaller than the instrument panel, the effects of the present invention can be enjoyed.

  Further, in the present embodiment, the mask jigs 6 and 7 are set and applied to the unpainted portions 4 and 5 of the skin 1, but the present invention can also be applied to the case where two colors are applied to the skin 1. When two colors are to be applied to the flexible skin 1, a mask jig is set on the first part where one color is to be applied, and the other color is applied to the second part where the other color is to be applied and dried. . Thereafter, a mask jig is set on the second portion, and one color is painted and dried. By doing so, two colors can be applied to the flexible skin 1. In this case, when one color is lighter than the other color, it is not always necessary to set a mask jig in the first portion. That is, one color is applied to the entire soft skin 1, and after the painted portion (that is, the entire surface) is dried, a mask jig is set on the second portion, and the other color is set on the first portion. May be painted. Furthermore, the present invention can also be applied when three or more colors are coated on the skin 1.

  In the present embodiment, a large number of holes 8 are formed over the entire outer surface 2a of the holding model 2 having the hollow portion 10, and the inside of the hollow portion 10 is sucked from the suction pipe 11 attached to the lower wall 2A. Thus, the inner surface 1a of the skin 1 and the outer surface 2a of the holding model 2 are brought into close contact with each other. However, this is merely an example, and the present invention is not limited to this method as long as the inner surface 1a of the skin 1 and the outer surface 2a of the holding model 2 can be brought into close contact with each other without breaking the shape of the skin 1.

  In the present embodiment, the suction tube 11 is attached to the lower wall 2A of the holding model 2. However, if the inside of the hollow portion 10 can be sucked and the skin 1 is not damaged, suction is included. The part to which 11 is attached is not limited to the lower wall 2A.

  In the present embodiment, the first mask jig 6 is L-shaped and the second mask jig 7 is anti-L-shaped. However, the shape is not limited to this, and the skin is not limited to this. 1 is determined by the shape of the unpainted portion.

  In the present embodiment, the angle of the corners 6A and 7A of the mask jigs 6 and 7 is made smaller than the angle of the corners 4A and 5A of the non-painted parts 4 and 5 of the skin 1 so that the mask jig 6 -Although 7 is made not to fall out of the skin 1, it is not restricted to this. As long as the mask jigs 6 and 7 can be set on the skin without damaging the surface of the skin 1, the mode is not limited.

  Moreover, in this embodiment, although the coating to the skin 1 is performed using a spray can, it is not restricted to this. Of the flexible skin with the mask jig set, if only the part where the mask jig is not set can be painted and the parting line 9 can be secured, the surface can be painted by other methods. Also good. Even in this case, it is possible to provide the flexible skin 1 with excellent paint finish.

It is the figure which showed the aspect by which an epidermis is hold | maintained at a holding | maintenance model. FIG. 2 is a sectional view of the holding model shown in FIG. It is the figure which showed the skin of the instrument panel after painting.

Explanation of symbols

1 Instrument panel skin 1a Inner surface of instrument panel skin 2 Retention model (shape retention member)
2A The lower wall 2a of the holding model The outer surface 3 of the holding model 3 Painted portion 4 One unpainted portion 4A Corner portion 5 The other unpainted portion 5A Corner portion 6 First mask jig 6A Corner portion 6a Mask jig surface 6b Back surface 7 of mask jig Second mask jig 7A Corner portion 7a Front surface 7b of mask jig Back surface 8 of mask jig (suction hole)
9 Parting line 10 Hollow part 11 Suction tube 11a One end 11b of the suction tube The other end of the suction tube

Claims (2)

A method of painting the skin in an instrument panel comprising a skin having a paint part,
Forming a flexible skin by slush molding or vacuum molding ;
Adhering the skin to the shape-retaining member;
A step of covering an unpainted portion of the close-up skin with a mask jig;
Have a, and performing a coating in a state covered by the mask jig,
The shape of the outer surface of the shape holding member is formed in substantially the same shape as the shape of the inner surface of the skin,
In the step of closely contacting, the outer skin is brought into close contact with the outer surface of the shape maintaining member over almost the entire area of the inner surface thereof,
The skin coating method , wherein, in the covering step, the mask jig is set on the skin whose shape is held by the shape holding member . The skin coating method according to claim 1, wherein the shape holding member is a mold that is substantially the same as the skin shape, and is a mold having suction holes on the surface for sucking air and adhering the skin.

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