JP2010214261A - Masking method and masking device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a masking method which omits cleaning work of a masking jig to cut down costs required for the cleaning work by coating a coating area divided by the masking jig with a paint and also by preventing the masking jig itself from being coated with the paint, and additionally can prevent a decrease in working efficiency of a forming operation of a resin molded object, and a masking device. <P>SOLUTION: The masking device 70 includes a masking jig 71 which is formed on a molded surface 21 of a resin mold 11, and also arranged at a distance from a convex part 22 forming a concave shape on the resin molded object, and partitions a coating area in which the molded surface is coated with the paint and a mask area in which the molded surface is not coated, and a gas spouting part 74 forming a curtain m for mask comprising a gas g by spouting the gas from the gap. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a masking method and a masking apparatus.

  As interior parts used in automobiles and homes, molded members with a skin having a three-layer structure of skin layer-foam layer-core material layer are frequently used. For the skin molding, an in-mold coating technique is used in which coating is performed in the mold. There are various types of in-mold coating technology. For example, paint is applied in a resin mold and a coating film is formed in advance (so-called mold coating). After the mold is clamped, a resin material is injected into the cavity. A method of molding a resin molded product integrated with a coating film in a resin mold is known.

  In general, the coating material is applied to the resin mold by placing a masking jig on the molding surface and determining an application region. The area where the masking jig is arranged is covered with the masking jig and prevents the paint from being applied. At this time, since the paint is applied to the outer surface of the masking jig, a coating film is formed (see Patent Document 1).

JP2007-245082

  If the masking jig coated with the coating material is used repeatedly, the coating film formed on the outer surface of the masking jig and the coating film formed on the molding surface may be continuously formed. When the coating film is continuously formed, when the masking jig is removed from the molding surface, the coating film formed on the molding surface is pulled together with the coating film formed on the outer surface of the masking jig. Peeling occurs and the appearance quality of the resin molded product is deteriorated.

  In order to prevent the coating film from being continuously formed on the masking jig and the molding surface, it is necessary to clean the masking jig and remove the adhering paint every time the coating operation is performed. For this reason, it is necessary to incorporate a work process for cleaning the masking jig into the molding work process of the resin molded product, resulting in an increase in cost required for the cleaning work and a reduction in work efficiency of the molding work.

  Therefore, an object of the present invention is to apply the paint to the application area divided by the masking jig, and to prevent the masking jig itself from being applied, thereby eliminating the masking jig cleaning operation. An object of the present invention is to provide a masking method and a masking apparatus capable of reducing the cost required for the cleaning operation and preventing a decrease in the work efficiency of the molding operation of the resin molded product.

  The present invention is a masking method in a resin mold, and a coating film forming a surface layer in a resin molded product is provided on a resin mold having a molding surface on which a convex portion for molding a concave shape in a resin molded product is formed. The method includes a step of disposing a masking jig for separating a coating area to be formed on the molding surface and a mask area not to be applied on the molding surface with a gap between the convex portion. Furthermore, it has the process of apply | coating a coating material on the molding surface of an application | coating area | region, blowing off gas from a clearance gap and forming the curtain for masks which consists of gas.

  In addition, the present invention is used when applying a paint for forming a coating film that forms a surface layer of a resin molded product on a molding surface of a resin mold on which a convex portion for forming a concave shape in the resin molded product is formed. A masking device, which is arranged on a resin mold with a gap between a convex portion and a masking jig for separating a coating area where paint is applied to a molding surface and a mask area where coating is not applied to the molding surface Have. Furthermore, it has a gas blowing part that blows out gas from the gap to form a mask curtain made of gas.

  By forming a mask curtain in the gap between the convex part and the masking jig that are provided on the molding surface of the resin mold and for molding the concave shape in the resin molded product, to the side of the segmented mask region It is possible to prevent the paint from being applied and to prevent the paint from adhering to the masking jig. For this reason, the work process which wash | cleans a masking jig | tool can be skipped, and while reducing the cost which a cleaning work requires, it can prevent that the working efficiency of a shaping | molding operation falls.

It is a flowchart which shows the process of the molding method of the resin molded product which concerns on embodiment. 2A is a cross-sectional view of a molding apparatus for a resin molded product showing a state in which a masking device is disposed and paint is applied to the molding surface, and FIG. 2B is a diagram showing a resin in the cavity with the resin molding die closed. It is sectional drawing of the shaping | molding apparatus of the resin molded product which shows the state which is inject | pouring material. It is sectional drawing for demonstrating the molding method of the resin molded product which concerns on embodiment. It is sectional drawing for demonstrating the molding method of the resin molded product which concerns on embodiment. It is sectional drawing for demonstrating the molding method of the resin molded product which concerns on embodiment. It is sectional drawing for demonstrating the molding method of the resin molded product which concerns on embodiment. It is sectional drawing for demonstrating the molding method of the resin molded product which concerns on embodiment. It is sectional drawing for demonstrating the molding method of the resin molded product which concerns on embodiment. It is sectional drawing for demonstrating the molding method of the resin molded product which concerns on embodiment. It is sectional drawing for demonstrating the molding method of the resin molded product which concerns on embodiment. It is sectional drawing for demonstrating the molding method of the resin molded product which concerns on embodiment. It is a figure which shows the comparative masking method which divides an application | coating area | region and a mask area | region only with a masking jig, and applies a coating material. It is a figure which shows the film formed by the masking method of proportionality. It is a figure which shows the other masking method of contrast.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted. In addition, the dimensional ratios in the drawings are exaggerated for convenience of explanation, and may be different from the actual ratios.

  2A and 2B show a reaction injection (RIM) molding apparatus of this embodiment. In the present embodiment, the masking method and the masking apparatus according to the present invention are applied to the RIM molding method and the RIM molding apparatus. The masking device 70 is used to distinguish between an application area where the paint 160 is applied and a mask area where the paint 160 is not applied when the paint 160 is applied to the resin mold 11 provided in the RIM molding apparatus 10. Examples of the resin molded product 100 molded by the RIM molding apparatus 10 include a skin layer used for an interior door trim of an automobile part having a three-layer structure of a skin layer, a foam layer, and a core material layer.

  Referring to FIG. 2 to FIG. 11, the masking device 70 is a resin molded product on the molding surface 21 of the resin mold 11 in which the convex portions 22 for molding the concave shape in the resin molded product 100 are formed. 100 is a masking device 70 used for applying a dark paint 160 (corresponding to a paint) that forms a dark paint film 161 (corresponding to a paint film) forming a surface layer in 100, A masking jig 71 disposed between the portion 22 and the gap 22, for separating a coating area where the dark paint 160 is applied to the molding surface 21 and a mask area where the dark paint 160 is not applied to the molding surface 21; A gas blowing part 74 for blowing a gas g from the gas to form a mask curtain m made of the gas g.

  The convex portion 22 included in the resin mold 11 includes a first vertical wall portion 23 and a second vertical wall portion 24 that form a pair rising in a direction protruding from the molding surface 21, and the first and second vertical wall portions 23. , 24 having a surface-shaped top portion 25 positioned between the tips of the first and second vertical wall portions 23 in the convex portion 22. And the masking jig 71, the second vertical wall portion 24 and the top portion 25 are included in the application region. The masking jig 71 is arranged with an end face 72 (hereinafter referred to as a jig end face) forming the gap 105 facing the first vertical wall portion 23 (see FIG. 5).

  A space 110 (hereinafter referred to as a gas holding space) for holding the gas g blown from the gap 105 is formed between the resin mold 11 and the masking jig 71, and the held gas g is used as the heat of the resin mold 11. It is heated by. The masking device 70 includes a suction unit 83 that sucks the paint that is blown off by the blown-out gas g and floats in the atmosphere. Hereinafter, this embodiment will be described in detail.

  Referring to FIGS. 2A and 2B, a resin molded product molding apparatus 10 includes a resin molding die 11 that forms a cavity 12 having a shape matching the resin molded product 100 by mold clamping, and a cavity 12. Injection means 40 for injecting molten resin material 155, coating means 50 for applying paints 160 and 170, and applying means 60 for mold release agent for applying release agent 180 to resin mold 11 (FIG. 3) and a masking device 70 for determining a region to which the paint is applied.

  The resin mold 11 has a mold surface 31 for forming the cavity 12 between the mold mold 20 having the mold surface 21 for forming the cavity 12 and the mold surface 21 of the mold 20 by clamping. And a core mold 30 formed.

  The molding surface 21 of the mold 20 has a substantially concave cross section that is recessed with respect to the core mold 30, and also positions the projection 22 for forming the recess in the resin molded product 100 and the masking jig 71. The positioning recess 26 is provided.

  The first vertical wall portion 23 serving as an end surface on the side where the masking device 70 is arranged in the convex portion 22 forms a gap 105 for blowing out the gas g with the masking jig 71 (see FIG. 5).

  The positioning recess 26 is provided so as to be freely engageable with a positioning projection 73 provided on the masking jig 71. By positioning the masking jig 71 while fitting them together, the masking jig 71 can be positioned on the mold 20.

  The molding surface 31 of the core mold 30 has a substantially convex cross section that protrudes with respect to the mold 20, and has a recess 32 that is recessed in correspondence with the convex 22 of the mold 20. The core mold 30 is provided so as to be movable toward and away from the mold mold 20. The resin mold 11 is clamped by moving the core mold 30 toward the cavity mold 20 (indicated by an arrow a in the figure). The cavity 12 is formed between the molding surface 21 of the cavity mold 20 and the molding surface 31 of the core mold 30 by clamping the resin molding die 11. The resin mold 11 is opened by moving the core mold 30 away from the mold 20 (indicated by an arrow a ′ in the figure).

  The mold temperatures of the mold 20 and the core mold 30 are kept higher than the ambient temperature around the resin mold 11. This is to prevent the resin material 155 injected into the cavity 12 from being rapidly cooled and to obtain the resin molded product 100 having a shape matching the inner surface shape of the cavity 12. The mold temperature of the cavity mold 20 and the core mold 30 is maintained within a temperature range in which the resin material 155 can be prevented from being rapidly cooled by a heater (not shown) or the like.

  As the injection means 40, a general mixing head is used. A molten resin material 155 is injected into the cavity 12 through a gate (not shown) by a mixing head. As the resin material 150, a urethane-based material generally used for polyurethane RIM molding is used.

  As the coating means 50 for paint, a commonly used paint spray gun is used.

  As the paint, a dark paint 160 for forming a relatively dark paint film on the outer surface of the resin molded product 100 and a light paint 170 (corresponding to another paint) having a lighter color than the dark paint 160 are used. (See FIG. 7).

  Two types of paints with different shades are applied on the molding surfaces 21 and 31 of the mold 20 so as to form two types of portions with different shades on the surface layer of the resin molded product 100. As will be described later, in the molded resin product 100, a portion corresponding to the coating region is formed with a surface layer composed of a dark color coating film 161 in the design appearance, and a portion corresponding to the mask region is formed with a light color coating film. A surface layer composed of 171 is formed (see FIG. 8).

  Application of the dark paint 160 is performed in a state where the masking jig 71 is disposed on the molding surface 21 and the application area where the dark paint 160 is applied and the mask area where the dark paint 160 is not applied are separated.

  For the release agent application means 60, a release agent spray gun generally used is used (see FIG. 3). As the mold release agent 180, for example, wax used for mold release of the resin molded product 100, metal soap, other silicone mold release agents, or the like can be used.

  The masking device 70 includes a masking jig 71, a gas blowing part 74, a support part 78 that supports the masking jig 71 between the mold 20, a suction part 83 that sucks paint that floats during application work, have.

  The masking jig 71 includes a jig end surface 72 disposed facing the first vertical wall portion 23 of the convex portion 22 included in the mold 20 and a positioning convex portion 73 for positioning the masking jig 71. And have.

  The jig end surface 72 preferably has a surface shape that is parallel to the first vertical wall portion 23 when the jig end surface 72 is disposed to face the first vertical wall portion 23. This is because the flow of the gas g blown out from the gap 105 is made smooth and the wind pressure of the gas g is increased.

  The masking jig 71 can be manufactured by molding a metal material such as iron. The material is not particularly limited and can be appropriately selected.

  The support part 78 has a cavity 79 for forming a jig fixing space 120 between the cavity mold 20, an air intake path 81 that communicates the cavity 79 with the outside, and air in the jig fixing space 120. And an intake hose 82 for conveying to the outside.

  The masking jig 71 is disposed on the mold 20 while being supported by the support portion 78, and the gas holding space 110 and the jig fixing space 120 are formed between the molding surface 21 of the mold 20 and the masking jig 71. Is formed.

  The inside of the jig fixing space 120 is evacuated by an air intake means (not shown), thereby preventing the masking device 70 arranged in the mold 20 from being displaced.

  Since the support portion 78 is disposed between the masking jig 71 and the mold 20, it is possible to prevent heat from being directly transferred from the warmed mold 20 to the masking jig 71 and to be generated by the heat. The deformation of 71 is prevented.

  The gas blowing section 74 includes a gas supply path 75 that communicates the gas holding space 110 with the outside thereof, and a gas hose 76 that sends the gas g stored in a chamber (not shown) into the gas supply path 75. Yes.

  The gas g fed from the chamber passes through the gas hose 76 and the gas supply path 75 and flows into the gas holding space 110. The gas g that has flowed into the gas holding space 110 is blown out toward the gap 105 (see FIG. 5). Here, the inside of the gas holding space 110 is in a heated state by heat transmitted from the mold 20. By allowing the gas g to pass through the gas holding space 110, it is possible to blow out the gas g in a warmed state as compared to before passing the gas g. For this reason, it is possible to form the mask curtain m by blowing out the gas g while preventing the mold temperature of the resin mold 11 from being lowered.

  The suction unit 83 uses a general intake device that sucks gas or the like. The paint sucked from the suction part 83 can be sent out to the outside of the resin mold 11 via the suction hose 84. By sucking the paint suspended in the atmosphere, it is possible to prevent the paint from adhering to the molding surface 31 of the core mold 30 and the paint from scattering to the outside of the resin mold 11.

  When applying the dark paint 160, a masking jig 71 is disposed on the mold 20. At this time, the jig end surface 72 is disposed to face the first vertical wall portion 23, and a gap 105 for forming the mask curtain m is formed between the first vertical wall portion 23 and the jig end surface 72. (See FIG. 5).

  Since the masking jig 71 can be positioned by a simple operation of making the jig end surface 72 face the first vertical wall portion 23 and move it close to and away from it, the work efficiency of the arrangement work can be improved. Can do. Similarly, the width dimension of the gap 105 can be adjusted by moving the jig end surface 72 closer to and away from the first vertical wall portion 23.

  The dimension of the end face of the jig facing the first vertical wall portion 23 is not particularly limited, but it is desirable to provide a dimension of about 1 to 5 mm in order to sufficiently exhibit the mask function.

  A masking jig 71 is arranged, and the application region and the mask region are separated from each other with the top portion 25 and the first vertical wall portion 23 in the convex portion 22 as a boundary. The application region is set to a range including the top portion 25 and the second vertical wall portion 24 in the convex portion 22, and the mask region is set to a range covered by the first vertical wall portion 23 and the masking jig 71 ( (See FIG. 5).

  The dark paint 160 is applied in a state in which a gas g is blown into the gap 105 to form a mask curtain m. The mask curtain m is formed along the first vertical wall portion 23 of the convex portion 22.

  By forming the mask curtain m in the gap 105 between the convex portion 22 for forming the concave shape in the resin molded product 100 and the masking jig 71, the dark paint 160 is applied to the side of the divided mask region. It is possible to prevent the dark paint 160 from adhering to the masking jig 71. For this reason, the work process which wash | cleans the masking jig | tool 71 can be abbreviate | omitted, and while reducing the cost which cleaning work requires, it can prevent that the working efficiency of a shaping | molding operation falls.

  The mask curtain m further prevents the dark paint 160 from entering the gap 105, and prevents the dark paint 160 from adhering to the first vertical wall portion 23 and the jig end surface 72.

  The masking jig 71 prevents the dark color paint 160 from being applied to the portion covered by the masking jig 71 even when the dark color paint 160 is scattered during the paint application operation.

  After application, the dark paint 160 forms a dark paint film 161 in the application area (see FIG. 6). An end portion 162 of the dark color coating film 161 is formed on the top portion 25 of the convex portion 22. Thus, by forming the gap 105 between the first vertical wall portion 23 of the convex portion 22 and the masking jig 71 and further forming the mask curtain m in the gap 105, the top portion of the convex portion 22 is formed. 25 and the second vertical wall portion 24 formed on the side where the masking jig 71 is not disposed, the dark paint 160 can be applied to form the dark paint film 161.

  When applying paints with different shades on the surface of the resin molded product and forming different parts with different shades continuously, there is a gap at the boundary between the edge of the dark paint film and the edge of the light paint film. There is a need to prevent. This is because the resin material portion is exposed to the outside due to a gap between the two, resulting in a decrease in appearance quality. In general, by forming the other coating film so as to overlap the end of one coating film, it is possible to prevent a gap from occurring between the two.

  As described above, when the dark color paint and the light color paint are applied in layers, the light color paint is applied to the molding surface after the dark color paint is applied. This is to prevent the dark paint film from being seen through under the light paint film when the resin molded product is used as a product.

  Even in this embodiment, after the dark paint 160 is applied to the molding surface 21 of the mold 20, the light paint 170 is applied over the portion where the dark paint 160 is applied, and the gap 105 is formed between the two. It is prevented from occurring.

  After the dark paint 160 is applied to the application region with the masking jig 71 disposed, the masking jig 71 is removed and the light paint 170 is applied to the entire molding surface 21 of the mold 20 (see FIG. 7). ). On the application area where the dark paint 160 is applied, a dark paint film 161 and a light paint film 171 are formed to overlap each other. When the resin molded product 100 is used as a product, the dark color coating film 161 prevents the light color coating film 171 from being seen through. For this reason, the site | part applicable to an application | coating area | region comprises the surface layer which consists of the dark color coating film 161 on the design external appearance.

  In the mask region where the dark paint 160 is prevented from being applied by the mask curtain m and the masking jig 71, only the light color coating film 171 is formed. For this reason, the site | part applicable to a mask area | region comprises the surface layer which consists of the light color coating film 171 on the design external appearance.

  Since the end portion 162 of the dark color coating film 161 is covered with the light color coating film 171, it is possible to form the resin molded product 100 in which the gap 105 is prevented from being generated at the boundary between them (see FIG. 11).

  Next, a method for molding a resin molded product will be described.

  Referring to FIG. 1, the molding method of a resin molded product can be summarized as follows: a step of applying a release agent 180 (S11), a step of placing a masking jig 71 (S12), and a molding surface 21. A step of applying the color paint 160 (S13), a step of removing the masking jig 71 (S14), a step of applying the light color paint 170 to the molding surface 21 (S15), a step of fastening the mold (S16), and a resin It includes a step of injecting the material 155 (S17), a step of opening the mold (S18), and a step of taking out the resin molded product 100 (S19). Hereinafter, the molding method of the resin molded product will be described in detail.

  With reference to FIG. 3, the process of apply | coating the mold release agent 180 is performed (S11). The mold 20 and the core mold 30 are opened, and the release agent 180 is applied to the molding surfaces 21 and 31. The release agent 180 is applied by the release agent spray gun 60.

  With reference to FIG. 4, the process of arrange | positioning the masking jig | tool 71 is performed (S12). The positioning of the masking treatment 71 is performed by moving the jig end surface 72 toward and away from the first vertical wall portion 23. The jig end surface 72 is disposed facing the first vertical wall portion 23, and a gap 105 is formed between the first vertical wall portion 23 and the jig end surface 72. The positioning of the masking jig 71 can be performed by using the positioning convex portion 73 provided on the masking jig 71 and the positioning concave portion 26 provided on the cavity mold 20 together. The positioning of the masking jig 71 can be performed with higher accuracy.

  A masking jig 71 is arranged, and the application region and the mask region are separated from each other with the top portion 25 and the first vertical wall portion 23 in the convex portion 22 as a boundary. The application region is set to a range including the top portion 25 and the second vertical wall portion 24 in the convex portion 22, and the mask region is set to a range covered by the first vertical wall portion 23 and the masking jig 71.

  Referring to FIG. 5, a step of applying dark paint 160 to molding surface 21 is performed (S13). The gas blowing part 74 blows out the gas g from the gap 105 to form the mask curtain m. A dark paint 160 is applied to the molding surface 21 of the mold 20 with the mask curtain m formed. The dark paint 160 is applied by the paint spray gun 50.

  The gas g passes through the gas holding space 110 that is heated by the heat transmitted from the mold 20 and blows out from the gap 105. This is for forming the mask curtain m by blowing out the gas g while preventing the mold temperature of the resin mold 11 from being lowered.

  The suction unit 83 sucks the paint floating in the atmosphere, and prevents the paint from adhering to the molding surface 31 of the core mold 30 and the paint from scattering to the outside of the resin mold 11.

  A dark color paint 160 is applied to the application region including the top portion 25 and the second vertical wall portion 24 of the convex portion 22 to form the dark color paint 161.

  The mask curtain m prevents the dark color paint 160 from being applied to the side of the divided mask region, and prevents the dark color paint 160 from adhering to the masking jig 71. Further, the dark paint 160 is prevented from entering the gap 105, and the dark paint 160 is prevented from adhering to the first vertical wall portion 23 and the jig end surface 72.

  Here, FIG. 12 shows a comparative masking method in which the coating region and the mask region are divided by only the masking jig 71 to apply the paint, and FIG. 13 is formed by the comparative masking method. The membranes 161 and 171 are shown.

  Referring to FIG. 12, for comparison, a range including the second vertical wall portion 220 and the top portion 230 of the convex portion 200 of the molding surface 250 is set as an application region and covered by the masking jig 240. A range including the broken portion and the first vertical wall portion 210 is set as a mask region. An L-shaped jig end surface is formed on the masking jig 71.

  The space between the L-shaped jig end face, the first vertical wall portion 210 and the top portion 230 is adjusted to divide the coating region and the mask region. Since the vertical wall portion 241 and the horizontal wall portion 242 of the L-shaped jig end face are positioned with respect to the top portion 230 and the first vertical wall portion 210 of the convex portion 200, the arrangement work of the masking jig 240 is complicated. Will occur.

  If the coating material 160 is applied in a state where the masking jig 240 is disposed, the coating material can be applied to the application region, but the coating material 160 also adheres to the vertical wall portion 241 on the end surface of the jig. Further, when the paint 160 enters between the first vertical wall portion 210 and the vertical wall portion 241 of the jig end surface, the paint 160 adheres to the mask region, or the coating amount of the paint 160 on the top portion 230 is sparse. There is a risk of becoming.

  Referring to FIG. 13, when the coating amount of the coating 160 on the top portion 230 is sparse, a portion where the dark color coating 161 and the light color coating 171 are mixed on the surface layer formed by applying different color coatings in layers. Will occur and the appearance quality will be degraded.

  In order to prevent the paint 160 from entering the mask region, it is necessary to reduce the distance between the first vertical wall portion 210 and the vertical wall portion 241 of the jig end surface. However, if this distance is narrowed, the coating material applied to the top 230 and the coating material 160 attached to the vertical wall portion 241 of the jig end surface are continuously formed, and the coating film 161 is removed when the masking jig 240 is removed. There is a risk of causing elongation or peeling (see FIG. 12B).

  FIG. 14 shows another comparative masking method that takes measures against problems that may occur in the above-described comparison.

  Referring to FIG. 14, in another comparison, the width 230 of the top portion 230 is increased, and the distance between the top portion 230 and the lateral wall portion 242 of the jig end surface is reduced, whereby the top portion 230 is It is set in a mask area where the paint 160 is not applied. Further, by reducing the distance between the first vertical wall portion 210 and the vertical wall portion 241 of the jig end surface, the paint 160 is prevented from entering between the two.

  In this contrast, the paint 160 can be prevented from entering the mask region, but the width dimension w of the top 230 must be set to a certain size or more, and the design of the appearance design of the resin molded product There is a problem that is limited. Further, in order to prevent the coating material 160 from entering the masking region, if the distance between the top portion 230 and the lateral wall portion 242 of the jig end surface is narrowed, the coating film 161 is continuously formed so as to fill the gap 105 between them. Will be formed. When removing the masking jig 240, the coating film 161 may be stretched or cut (see FIG. 14B).

  On the other hand, in this embodiment, a gap 105 is formed between the first vertical wall portion 23 of the convex portion 22 and the masking jig 71, and a mask curtain m is formed in the gap 105. By doing so, the dark paint 160 can be applied to the top portion 25 of the convex portion 22 and the second vertical wall portion 24 formed on the side where the masking jig 71 is not disposed. Further, the dark paint 160 is prevented from entering the gap 105, and the dark paint 160 is prevented from adhering to the first vertical wall portion 23 and the jig end surface 72. For this reason, it is possible to prevent the dark color paint 160 from being applied to the top 25 mottled or the paint from adhering to the masking region. When the masking jig 71 is removed, the resin molded product 100 may be stretched or cut, or the shade layer may be irregularly formed on the surface layer formed by applying coatings with different shades, resulting in a decrease in appearance quality. This can be prevented (see FIG. 11).

  Referring to FIG. 6, a step of removing masking jig 71 is performed (S14). After applying the dark paint 160, the masking jig 71 is removed from the mold 20.

  Referring to FIG. 7, a step of applying light color paint 170 to molding surface 21 is performed (S15). On the application area where the dark paint 160 is applied, a dark paint film 161 and a light paint film 171 are overlaid. The dark color coating film 161 prevents the light color coating film 171 from being seen through.

  Only the light color coating film 171 is formed in the mask region where the dark paint 160 is not applied. A portion corresponding to the mask region constitutes a surface layer composed of the light-colored coating film 171.

  By covering the end portion 162 of the dark color coating film 161 formed at the top portion 25 of the convex portion 22 with the light color coating film 171, the surface layer of the resin molded product 100 in which the gap 105 is prevented from being formed at the boundary between the two is formed. To do.

  Referring to FIG. 8, a mold clamping step is performed (S16). The resin mold 11 is clamped by moving the core mold 30 closer to the mold 20. A cavity 12 having an inner surface shape that matches the outer shape of the resin molded product 100 is formed between the molding surface 21 of the mold 20 and the molding surface 31 of the core die 30.

  Referring to FIG. 9, a step of injecting resin material 155 is performed (S17). A molten resin material 155 is injected into the cavity 12 by the mixing head 40.

  Referring to FIG. 10, a step of opening the mold is performed (S18). After the resin material 150 is cured and the resin molded product 100 integrated with the dark color film 161 and the light color film 162 is formed, the resin mold 11 is opened.

  Referring to FIG. 11, a step of taking out resin molded product 100 is performed (S19). A dark-colored coating film 161 formed from a dark-colored paint 160 applied by separating the coating area and the mask area by the masking device 70, and a light-colored coating film formed from a light-colored paint 170 applied to the entire molding surface 21. The resin molded product 100 in which the surface layer composed of 171 and the resin material 150 are integrated can be obtained.

  As described above, according to this embodiment, the mask curtain m is formed in the gap 105 between the convex portion 22 that forms the concave shape in the resin molded product 100 and the masking jig 71. The dark paint 160 can be prevented from being applied to the mask region side, and the dark paint 160 can be prevented from adhering to the masking jig 71. For this reason, the work process which wash | cleans the masking jig | tool 71 can be abbreviate | omitted, and while reducing the cost which cleaning work requires, it can prevent that the working efficiency of a shaping | molding operation falls.

  By covering the end portion 162 of the dark color coating film 161 with the light color coating film 171, it is possible to form the surface layer of the resin molded product 100 in which the gap 105 is prevented from being generated at the boundary between them.

  The dark paint 160 can be applied to the second vertical wall portion 24 formed on the side where the top portion 25 and the masking jig 71 are not arranged in the convex portion 22. The dark paint 160 is prevented from entering the gap 105, and the dark paint 160 is prevented from adhering to the first vertical wall portion 23 and the jig end surface 72. For this reason, it is possible to prevent the dark color paint 160 from being applied to the top 25 mottled or the paint from adhering to the masking region. When the masking jig 71 is removed, the resin molded product 100 may be stretched or cut, or the surface layer formed by applying coatings with different shades may be irregularly formed and the appearance quality may be deteriorated. It can be prevented from occurring.

  Since the jig end surface 72 is disposed to face the first vertical wall portion 23, the masking treatment is performed by a simple operation of simply moving the jig end surface 72 facing the first vertical wall portion 23 so as to approach and separate. The tool 71 can be positioned. For this reason, the work efficiency of the placement work can be improved.

  By allowing the gas g to pass through the gas holding space 110, it is possible to blow out the gas g in a warmed state as compared to before passing the gas g. For this reason, the mask curtain m can be formed by blowing out the gas g while preventing the mold temperature of the resin mold 11 from being lowered.

  The suction unit 83 sends the paint sucked from the suction unit 83 to the outside of the resin mold 11. For this reason, it is possible to prevent adhesion of the paint to the molding surface 31 of the core mold 30 and scattering of the paint to the outside of the resin mold 11 by sucking the paint floating in the atmosphere.

  This embodiment can be modified as appropriate.

  In order to further prevent the paint from being scattered in the resin mold 11 when applied with the paint, for example, the resin mold 11 is arranged in the booth, and the paint suspended in the atmosphere is sucked to the outside of the booth. It is also possible to adopt a configuration that discharges to

  The dimension of the gap 105 formed between the first vertical wall portion 23 and the jig end surface 72 is not particularly limited. It is possible to appropriately change within a range in which the masking effect by the mask curtain m can be obtained. Further, the type of gas for forming the mask curtain is not particularly limited, but it is desirable to use air in order to reduce costs.

  The colors of the dark paint 160 and the light paint 170 are not particularly limited, and can be selected as appropriate. The darkness of the dark paint 160 and the light paint 170 is not particularly limited as long as the color of the other paint is lighter than the other paint.

  The paint and the resin material 150 are not limited to urethane materials, and for example, materials made of thermoplastic and thermosetting resins can also be used.

  In the embodiment, the gap g is formed between the first vertical wall portion 23 and the masking jig 71. For example, the gap g is formed between the second vertical wall portion 24 and the second vertical wall portion 24. It is also possible to form a mask curtain m in the gap g. In this case, the jig end surface 72 is disposed facing the second vertical wall portion 24.

  A masking method and a masking apparatus according to the present invention provide a method for applying a coating material for forming a coating film forming a surface layer to a resin mold having a molding surface on which a convex portion for forming a concave shape is formed on a resin molded product. The present invention can be widely applied for the purpose of defining the coating region of the paint by a mask curtain formed by a gas blown between the portion and the masking jig. For this reason, application is not limited only to reaction injection molding, but it is possible to apply to other molding methods and molding apparatuses aimed at obtaining resin molded products. It is also possible to apply the present invention to a masking method and a masking device for applying at least one kind of paint having a coating area defined on the resin mold to the resin mold.

10 Mold (mold),
20 Upper mold,
21 Molding surface of the upper mold,
23 Mold matching surface of upper mold,
30 Lower mold (application object),
31 Lower mold surface (application surface),
32 The peripheral edge of the molding surface of the lower mold,
33 Mold matching surface (mask area) of the lower mold,
34 End (mask area) of the mold matching surface of the lower mold,
40 steps,
41 1st vertical wall part,
42 second vertical wall,
43 flat part,
50 Recess for mask,
60 positioning pins (engagement members),
61 pin body,
62 protrusions,
70 positioning rod (engaging member),
81 gun for application,
82 Release agent gun,
85 cavities,
90 resin molded products,
91 resin material,
92 Coating material,
93 paint film,
94 release agent,
96 film residue,
100 masking jig,
110 body,
111 convex part for mask,
112 bends,
115 fixing flange part (engagement part),
116 grooves,
117 insertion guide,
118 engagement hole (engagement part),
120 overhang part,
125 flange part,
g1 The gap between the coated surface and the overhang,
θ Tilt angle.

Claims (10)

An application region for applying a coating material for forming a coating film forming a surface layer in the resin molded product to a resin mold having a molding surface on which a convex portion for forming a concave shape in the resin molded product is formed, A step of disposing a masking jig for separating a mask region not applied to the molding surface with a gap between the convex portion;
Applying a paint to the molding surface of the application region while blowing a gas from the gap to form a mask curtain made of the gas.   After the step of applying the paint, the gas blowing from the gap is stopped, the masking jig is removed from the resin mold, and another paint lighter in color than the paint is applied to the paint in the application area. The masking method in the resin molding die according to claim 1, further comprising a step of applying to the molding surface of the mask region so as to overlap with an end of the mask. The convex portion includes a pair of first and second vertical wall portions that rise in a direction protruding from the molding surface, and a surface-shaped top portion positioned between the tips of the first and second vertical wall portions. Have
By forming the gap between one of the first and second vertical wall portions in the convex portion and the masking jig, the other of the first and second vertical wall portions and the top portion are formed. As the application area,
The masking method in the resin mold according to claim 1 or 2, wherein in the step of applying the paint, the paint is applied to the second vertical wall portion and the top portion.   The gas blown out from the gap is a masking method in a resin mold according to any one of claims 1 to 3, wherein the gas is heated by heat of the resin mold.   The masking method in the resin mold according to any one of claims 1 to 4, wherein in the step of applying the paint, the paint that has been blown by the blown-out gas and floated in the atmosphere is sucked. A masking device used when applying a paint for forming a coating film forming a surface layer of the resin molded product on a molding surface of a resin mold on which a convex portion for forming a concave shape in the resin molded product is formed ,
A masking jig for separating the application area where the paint is applied to the molding surface and the mask area where it is not applied to the molding surface;
A gas blowing unit for blowing a gas from the gap to form a mask curtain made of the gas, and a masking device for a resin mold. The convex portion includes a pair of first and second vertical wall portions that rise in a direction protruding from the molding surface, and a surface-shaped top portion positioned between the tips of the first and second vertical wall portions. Have
By forming the gap between one of the first and second vertical wall portions in the convex portion and the masking jig, the other of the first and second vertical wall portions and the top portion are formed. The masking device for a resin mold according to claim 6, which is used as the application region.   8. The masking device for a resin mold according to claim 7, wherein the masking jig is arranged so that an end surface forming the gap faces one of the first and second vertical wall portions.   A space for holding a gas blown from the gap is provided between the resin mold and the masking jig, and the held gas is heated by heat of the resin mold. The masking apparatus for resin molds as described in any one of these.   The masking device in the resin mold according to any one of claims 6 to 9, further comprising a suction unit that sucks the paint that is blown off by the blown-out gas and floats in the atmosphere.

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