JPH06344377A - Decorative molded product and in-molding method thereof - Google Patents

Abstract

PURPOSE:To integrate even a decorative sheet hard to extend with the surface of a molded product without generating wrinkles or breakage by fixing the decorative sheet to the parting surface of a female mold by the stripper plate provided to a male mold and clamping the male and female molds while stretching the decorative sheet by the molded product forming surface of the male mold to perform injection molding. CONSTITUTION:A stripper plate 31 is arranged to a male mold 3 by a support rod 32 and energized toward a female mold 2 by a spring 33. A spot facing 26 is provided to the part of the female mold 2 corresponding to the support rod 32. A decorative sheet 4 is preparatorily fixed to the parting surface 23 of the female mold by the suction force from the vacuum hole 22 of the female mold 2. In a clamping process, the strip plate 31 comes into contact with the decorative sheet 4 prior to the molded product forming surface 34 of the male mold 3 to fix the decorative sheet 4 to the parting surface 23 of the female mold 2. Subsequently, the molded product forming surface 24 of the male mold comes into contact with the decorative sheet 4 to stretch the sheet 4 and, after the completion of mold clamping, a molten resin is injected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a molded product in which the surface of the molded product is covered with a decorative sheet, and an in-mold molding method in which the molded product and the decorative sheet are integrated together with the molding of the molded product. Regarding In particular, for plastic molded products, an in-mold molding method suitable for integrating a stretchable decorative sheet such as synthetic leather on the surface of the molded product at the same time as the injection molding of the molded product, and the decorative molded product obtained thereby. Regarding

[0002]

2. Description of the Related Art In recent years, in response to a demand for higher design of plastic molded products, products in which molded products are painted by various methods are used in many fields. Home appliances,
By increasing the design expression of various items such as furniture, kitchen products, cosmetics containers, sundries, toys, etc., the product value of products is being enhanced. As a method of decorating these plastic molded products, after molding the plastic, it is of course not only a flat surface when printing, but also a curved surface such as a tampo printing method or an underwater transfer method. The decoration technology by printing is used. Further, in a method of decorating at the same time as molding of plastic, a decorating technique called a simultaneous molding painting method, that is, an in-mold molding method is used as one of them. With the in-mold molding method, for example, a transfer sheet having a pattern printed on a polyethylene terephthalate film or the like is previously arranged as a decorative sheet inside a plastic injection mold, and the male mold and the female mold are clamped. After that, the resin is injected into the mold, and the pattern on the transfer sheet is transferred to the surface of the molded product at the same time as molding by utilizing the heat and pressure of the resin. In place of the transfer specification sheet, there is also a specification of a decorative sheet in which the sheet is left on the surface of the molded product at the same time as the design. In any case, when a sheet of thermoplastic synthetic resin is used as the material of the decorative sheet, if a thermoplastic synthetic resin having appropriate elongation aptitude and moldability is appropriately selected, it is possible to obtain a curved surface to some extent. Correspondence is possible. However, as a material for the decorative sheet, a material such as a woven cloth which has almost no elongation suitability or moldability, the application of the in-mold molding method is extremely limited in shape. A method of pasting after molding has been performed.

[0003]

A method for decorating a molded product at the same time as molding is to attach a decorative sheet or a pattern on the sheet to the surface of the molded product by some means. If injection molding is used, a decorative sheet is interposed between the injection molding die surface and the injection resin, and the decorative sheet is welded to the surface of the molded product by the heat pressure of the molten injection resin when it is injected. And the like. However, the surface shape of the molded product to which the decorative sheet can be attached is usually a flat surface or a quadric surface, and even in that case, when the decorative sheet slightly expands due to the heat pressure of the resin during molding of the molded product, By using the heat pressure, it was possible to limit the decoration to a loose three-dimensional curved surface. In addition, the point that even a loose three-dimensional curved surface can be obtained is an advantage that cannot be obtained by the post-processing method in which a sheet is attached after the above-mentioned molding. For attaching a decorative sheet to a more complicated three-dimensional curved surface, pre-form the decorative sheet into a pasting surface shape by vacuum forming, etc., and place the preformed decorative sheet in the mold. Although there is a method that can be dealt with by molding afterwards, it was not a method with good productivity because the number of preforming steps was increased.

As described above, there is no problem in adapting to a flat surface or a quadric surface because it hardly depends on the stretchability of the decorative sheet. It is impossible to adapt to the lack. In the case of a decorative sheet using a biaxially stretched polyethylene terephthalate film as a base material, it has elongation suitability for a certain degree of three-dimensional curved surface, so it is not possible to decorate the surface of the molded product at the same time as molding of the molded product. Possible, but
When the woven fabric itself is a decorative sheet, the fibers constituting the woven fabric usually do not have elongation aptitude, so if the fiber is a slight three-dimensional curved surface, the fibers are forcibly elongated, It was possible to adapt, but the reality was that adaptation to more than that was extremely limited. Synthetic leather is also a material that is difficult to stretch like woven cloth. This is because the synthetic leather has a structure in which a synthetic resin on which a leather pattern is formed is laminated using a woven cloth as a base material, and even if the synthetic resin layer has stretchability, it is a woven cloth that is a base material. This is because the stretchability is poor as a whole. On the other hand, as compared with synthetic leather, artificial leather or natural leather itself, which has a more realistic natural leather feel, does not contain woven cloth but contains dense fiber material and is poor in stretchability.

However, in recent years, there is a tendency for decorative products to be satisfied with simple decoration such as printing, and there is a demand for products with a higher quality and textures. A certain molded product was also longed for. However, in the case of in-mold molding using a decorative sheet made of a material with a leathery feel, since the stretchability is poor, the decorative sheet will be torn when stretched forcibly, so there is a significant limit to the shape of the molded product that can be applied. , Its use was extremely limited. In particular, when the decorative sheet comes into contact with a portion where the corners are convex in the mold shape of the molded product, breakage of the decorative sheet is likely to occur, and this also imposes a restriction on the shape of the molded product. Furthermore, in the case of forcibly stretching such a decorative sheet having poor elongation aptitude by in-mold molding, it is essential to firmly fix the decorative sheet as a prerequisite, otherwise the decorative sheet However, there is a problem in that the sheet moves in the mold and becomes unstable, the decorative sheet shifts and approaches, or wrinkles that bite into the resin along the weld line occur. Further, since the decorative sheet is finally stretched by using the heat pressure of the injected molten resin, the molten resin is injected into the mold by increasing the heat pressure of the molten resin so that the decorative sheet can be easily stretched. There is also a problem in that the decorative sheet is deformed by the heat and pressure around the part to impair the appearance of the molded product. For this reason, setting the gate in consideration of the deviation of the decorative sheet due to the flow of the molten resin in the mold of the decorative sheet and the condition of the weld line requires a higher level of skill than the simple injection molding to set the conditions. there were.

[0006]

In order to achieve the above object, in the in-mold molding method of the present invention, a decorative sheet is sandwiched between a female mold and a male mold, and molten resin is injected from the male mold side. Then, in the in-mold molding method for obtaining a decorative molded product in which a decorative sheet is attached to the surface of the molded product, the male mold is provided with a stripper plate, and the male mold product is in a state where the mold is opened. The stripper plate is arranged at a position closer to the female mold than the portion closest to the female mold on the forming surface, and in the mold clamping process, the stripper plate becomes a decorative sheet before the male molded product forming surface. The female parting surface and the stripper plate contact each other to fix the decorative sheet by sandwiching the periphery of the molded product, and then the male molded product forming surface stretches the decorative sheet to complete the mold clamping. By injecting molten resin It is characterized in that.

Further, regarding the outer shape of the decorative molded product, in the intermediate stage of the manufacturing process, the portion corresponding to the outer peripheral portion of the molded product, which is the boundary line between the female parting surface and the female molded product forming surface, is concerned. The outer periphery of the molded product obtained by forming a recess on the parting surface along the boundary line between the female parting surface corresponding to the decorative sheet side and the female molded product forming surface in the mold for molding the molded product. It is characterized by being a decorative molded product having a structure having a flange-shaped convex portion on its part. When the tsuba is not needed, trim it after molding to make the final decorated molded product.

The present invention will be described in detail below with reference to the drawings. FIG. 1 is a vertical sectional view of an in-mold molding die used in the present invention. The in-mold molding die 1 used in the present invention is
The decorative sheet 4 is disposed on the female die 2, and the molten resin 5 is injected from the male die 3 into the space inside the die. The female die 2 is provided with a vent hole 21 communicating with a vacuum exhaust source, and the vent hole 21 is opened as a vacuum hole 22 of a parting surface 23 of the female die 2. The decorative sheet 4 is arranged at a predetermined position on the female parting surface 23. The decorative sheet 4 is preliminarily fixed to the female mold 2 by the suction force of the vacuum holes 22.
Prevents falling down due to its own weight. Figure 2
It is the figure which looked at the state where the decoration sheet 4 was preliminarily fixed to the female mold 2 from the direction of the male mold. A plurality of vacuum holes 22 are usually provided in order to generate an appropriate holding force. The position of the vacuum hole 22 is
It is provided at a position where it is covered by the decorative sheet 4. The shape of the vacuum hole 22 is circular in FIG. 2, but may be slit-like or the like. The number, position, and shape of the vacuum holes 22 are the decorative sheet 4
May be appropriately selected in consideration of the weight, thickness, surface roughness, air permeability, suppleness, etc. of the decorative sheet so that the sheet does not drop due to its own weight. On the other hand, a stripper plate 31 is arranged on the male die 3 by a support rod 32 so as to be movable in the left-right direction in the drawing. The stripper plate 31 has a structure in which a repulsive force of the spring 33 exerts a force in the female mold direction. The support rod 32 is usually called a stripper bolt or the like, and has a structure in which the stripper plate 31 is prevented from falling off from the support rod 32 by the repulsive force of the spring 33 at its head. Also, the support rod 3
Since the stripper plate 31 comes into contact with the decorative sheet 4 before the male molded product forming surface 24, the tip end of 2 hits the parting surface 23 of the female mold 2 when the mold is clamped. . Therefore, a counterbore 26 is formed on the parting surface 23 of the female die 2 facing the support rod.
Is provided to prevent the support rod 32 from contacting the female die when the die is clamped.

Next, the procedure of the in-mold molding method according to the present invention using the in-mold molding die described above will be described. First, the mold 1 is open and the female mold 2 and the male mold 3 are
In a state in which is separated from each other, the decorative sheet 4 is attached to the parting surface 23 of the female die 2 and pre-fixed. Next, the mold clamping process is started. What is important at this time is that the stripper plate 31 comes into contact with the decorative sheet 4 before the male molded product forming surface 34. Therefore, the stripper plate 31 is located closer to the female mold 2 than the male molded product forming surface 34 (more precisely, the surface of the molded product forming surface of the male mold 3 that is closest to the female mold 2 when the mold is opened). Is close to the spring 33
The female die sticks out in two directions. In the in-mold molding die used in the present invention, the stripper plate 31 of the male die 3 has a function of originally releasing the molded product from the die after the injection molding which is the intended function thereof, and the decorative sheet 4 It also has a function of permanently fixing. Needless to say, it is not essential that the stripper plate projects beyond the male molded product forming surface 34 because it has the function of an ordinary stripper plate to release the molded product after injection molding. As the female mold 2 and the male mold 3 come closer to each other in the mold clamping process, the stripper plate 31 that comes into contact with the decorative sheet 4 firmly presses the decorative sheet 4 by the repulsive force of the spring 33 at the back, and the parting of the female mold 2 is performed. Secure to surface 23. After fixing the periphery of the decorative sheet 4,
The male molded product forming surface 34 comes into contact with the decorative sheet 4 to start stretching the decorative sheet 4. Since the periphery of the decorative sheet 4 is firmly fixed by the stripper plate 31, the decorative sheet 4 does not shift during stretching, so that sufficient stretching can be obtained. FIG. 3 shows the time when the mold clamping is completed. When the mold clamping is completed, since the stripper plate 31 is in direct contact with the male mold in addition to the repulsive force of the spring 33, the decorative sheet 4 is firmly pressed by the mold clamping force itself of the molding machine. .

Next, FIG. 4 shows a state after the mold is closed and the molten resin is injected therein. As the decorative sheet 4 is filled with the injection resin, the decorative sheet 4 is pressed and moved from the male molded product forming surface 34 to the female molded product forming surface 24 side by the thermal pressure, and the decorative sheet 4 and the male molded product are formed. Between the surface 34 (Fig. 4)
The right side) is filled with injection resin. The decorative sheet 4 eventually has a shape conforming to the female molded product forming surface 24. Figure 5
(A) is a perspective view which illustrates the decorative molded product obtained in this way and which has the surface shape of the three-dimensional curved surface to which the decorative sheet was stuck. FIG. 5B is a vertical cross-sectional view of the decorative molded product shown in FIG. 5A viewed from the side along the cutting line AA ′, and the decorative sheet 4 and the base resin. 7 shows the configuration of No. 7.

Next, the important point in the present invention is the shape of the outer peripheral portion of the decorative molded product. That is, it is the shape of the portion shown by the outer peripheral portion 61 of the molded product in the vertical cross-sectional view of the decorative molded product illustrated in FIG. The decorative molded product according to the present invention is characterized in that the outer peripheral portion 61 of the molded product is provided with a collar. Even if a decorative sheet that is difficult to stretch is provided with a brim, it is difficult to tear and is sufficiently stretched. As a result, it becomes possible to perform in-mold molding even for a molded product with a shape that was impossible in the past. Is obtained.

FIG. 6 is an enlarged cross-sectional view for explaining the collar portion of the decorative molded product according to the present invention. FIG. 6 (a) shows the inside of the mold after the mold is closed and before the resin is injected. The state of the decorative sheet 4 is shown, FIG.6 (b) shows the state of the decorative sheet 4 in a metal mold after resin is injected, and FIG.6 (c) is the collar of the obtained decorative molded product. 8 shows the state of the decorative sheet 4 and the base resin 7 in the portion 8 and FIG. 6 (d) shows the outer peripheral portion of the final decorative molded product after the unnecessary collar portion is cut. On the other hand, FIG.
Is for explaining the outer peripheral portion of the decorative molded product according to the conventional method, and FIG. 7A shows the state of the decorative sheet 4 in the mold after the mold is closed and before the injection of the resin, FIG. 7B shows the state of the decorative sheet 4 in the mold after the resin has been injected, and FIG. 7C shows the decorative sheet 4 in the peripheral portion of the obtained decorative molded product.
And the state of the base resin 7.

The collar will be described in more detail below. In the conventional in-mold molding method, a mold as shown in FIG. 7A was used to obtain a molded article having an outer peripheral shape as shown in FIG. 7C. Note that FIG. 7A shows the positional relationship between the female mold 2 on the upper side and the male mold 3 on the lower side, and the positional relationships between the female mold and the male mold in FIGS. 6 and 7 are all the same. Figure 7
As shown in (a), the decorative sheet 4 after the mold clamping has a female parting surface 23 and a stripper plate 31 on the periphery.
It is sandwiched and fixed by and is extended toward the upper female mold by the male molded product forming surface 34 of the lower male mold 3. Furthermore, the decorative sheet 4 contacts the edge 93. The edge 93 is a boundary line between the parting surface 23 of the female mold and the surface 24 of the molded female product. However, since the decorative sheet 4 is stretched and stretched, the decorative sheet 4 is in firm contact with the edge 93. In FIG. 7 (a), the mold clamping is completed, that is, the drawing of the decorative sheet 4 is almost completed before the resin injection, and for the time being, the decorative sheet 4 is drawn without being broken. However, the edge 93 that contacts the decorative sheet 4 acts like a blade during the process of mold clamping, and the decorative sheet 4 is often cut at the portion that contacts the edge 93. To do. Even if the decorative sheet 4 does not break until the mold clamping is completed, the decorative sheet 4 is melted when the final stretching of the decorative sheet 4 is performed by the heat pressure of the molten resin in the subsequent injection step. This is also because the decorative sheet 4 is broken by the heat of 1. Therefore, the decorative sheet 4 may be broken.

Therefore, as a result of intensive studies by the present inventors,
It has been found that if the outer peripheral portion of the molded product is molded to have a collar 8 as shown in FIG. 6 (c), the cutting of the decorative sheet by the edge is effectively reduced. Moreover, the brim 8 can be easily cut and removed after molding, and a decorative molded product having the same outer shape as the conventional one shown in FIG. 6D can be obtained. FIG. 6B shows a state where the molten resin is injected after the mold is clamped, the resin is also filled in the flange 8 and the decorative sheet 4 is moved to the female molded product forming surface 24. As a result, FIG. 6C shows a portion of the collar 8 of the obtained decorative molded product after in-mold molding, and FIG. 6D shows a state after trimming the collar 8. The trimming of the collar 8 is easily completed by preparing a mold blade having the same outer shape as that of the molded product without the collar 8 and cutting with the mold blade. The cutting can be easily performed by press cutting or the like.

By providing the collar 8, the decorative sheet 4
It is not clear why the fracture of the can be effectively prevented, but it is assumed as follows. That is, the collar 8 according to the present invention is
Although the mold is formed as shown in FIG. 6, the difference between FIG. 6A and the conventional FIG. 7A is that the edge is composed of two edges 91 and 92. In FIG. 6A, the decorative sheet 4 contacts both the edge 91 and the edge 92. Regarding the edge 92, on the right and left sides of the edge 92 of the decorative sheet 4, the right side portion in the drawing is completely fixed by being sandwiched between the female parting surface 23 and the stripper plate 31, but the left side portion in the drawing is It is pulled to the upper left, but free. On the other hand, with respect to the edge 91, both the left and right portions of the edge 91 of the decorative sheet 4 are pulled, but both are in a free state. The free state is a state in which the position of the decorative sheet is not completely fixed during the mold clamping process and the injection process.

First, in the mold clamping process, the decorative sheet 4 is forcibly stretched in the upper left direction by the force from the lower side to the upper side in the central portion of the molded product which is the left side in FIG. 6 (a). This elongation spreads over the entire free portion of the decorative sheet 4 which is not completely fixed, and the decorative sheet 4 behaves so as to make the local elongation uniform (however, the elongation of the central portion and the elongation of the peripheral portion). Will not be at the same level). As a result, it is considered that the decorative sheets 4 on the left and right of the edge 91 are stretched and moved while being stretched leftward in FIG. Therefore, the surface of the decorative sheet 4 that contacts the edge 91 (actually, the edge 91 is linear and is not a surface but a line contact line) is not always in contact with the edge 91. I understand. On the other hand, since the right side of the edge 92 is completely fixed, the surface of the decorative sheet that contacts the edge 92 is always the same. For this reason, even if the surface in contact with the edge 91 is about to break, it is assumed that new surfaces come into contact with each other one after another and are unlikely to break. Further, in the edge 91 portion, the decorative sheets 4 on the left and right portions are in a free state, but are in a state of being stretched by the force to be stretched, so that the decorative sheet 4 is in contact with the edge 91 with a force toward the edge 91. So not totally free,
It is presumed to be a semi-fixed state. Therefore, the edge 91 has a cushioning effect on the edge 92 that is completely fixed, and the force for fixing the decorative sheet 4 with the edge 92 is applied to the edge 9.
It is assumed that the decorative sheet can be prevented from breaking at the edge 92 as well. It is considered that the above mechanism can effectively prevent breakage of the decorative sheet 4 during the mold clamping process.

Next, in the injection process, the molten resin begins to enter the gap between the decorative sheet 4 and the male molded product forming surface 34 from the center of the molded product, and gradually flows to the peripheral part to the flange part. Filling and injection are completed. In this process, the behavior of the decorative sheet 4 is the same as in the previous mold clamping process because the center part of the molded product is pushed up from the bottom in FIG. 6 (a) at the initial stage of injecting the molten resin. You can infer something. At the next stage, the molten resin flows to the peripheral portion, so that the decorative sheet 4 moves toward the peripheral portion, that is, in the lower right direction in FIG. 6A, along the flow of the resin. Try to move. In addition, since the central portion of the decorative sheet 4 is first contacted with the molten resin to be heated (even if the decorative sheet 4 itself has poor elongation suitability), if it is stretched to some extent, a new amount of elongation is obtained. The decorative sheet 4 tries to move toward the peripheral portion up to the equilibrium point. Therefore, at this stage, the decorative sheet 4 will move in the direction opposite to the previous mold clamping process. Further, at the stage where the molten resin reaches the vicinity of the flange of the peripheral portion, the molten resin pushes up the decorative sheet 4 from the bottom to the top and presses it against the female molded product forming surface 24.
Since the force to move to the upper left also works, it is considered that the final moving direction and the amount of movement are determined by the balance with the force in the lower right direction of the previous stage. Lastly, at the stage where the collar portion is filled with the molten resin, the decorative sheet 4 is pushed upward from below along the flange shape, so that the decorative sheet 4 tends to move to the right. Thus, in the injection process,
It is presumed that the decorative sheet 4 behaves in a complicated manner unlike the mold clamping process, but in any case, since it is in a free state around the edge 91, the decorative sheet 4 is broken in the same manner as the mold clamping process. Can be effectively prevented.

Although the collar structure according to the present invention is taken into consideration, the thinner the collar 8 is, the better, considering the ease of trimming the collar 8.
Further, since the collar 8 is a waste after trimming, the volume of the collar 8 is preferably as small as possible in consideration of economical efficiency. However, in order to effectively expect the breakage of the decorative sheet 4, the collar 8
The size of the resin wall thickness is about 0.3 ~ 1.0 mm,
It is preferably about 0.5 mm and the length is about 2 to 7 mm, preferably about 3 mm.

As described above, if one of the causes of breakage of the decorative sheet is the edge of the mold, the edge may be formed into a shape having a gentle R instead of an acute angle and a sharp shape. It is supposed to be. However, the shape with R is not practically convenient, which is the significance of the collar of the present invention. FIG. 8A shows a state of the decorative sheet 4 when resin is filled after the mold is clamped in a mold having an edge 94 having an R. FIG. 8 (b) shows the shape of the outer peripheral portion of the molded product thus obtained. Distance x around the molded product
The outer peripheral convex portion 10 protruding only is generated. Needless to say, it is aesthetically unfavorable if the outer peripheral portion of the molded product is not sharply raised. However, the molded product is butt-mounted with another molded product in the vertical direction and used in combination like a lid and a container. In the case of a plastics container such as a compact case, a cosmetics case, a seal case, and an eyeglass case, the outer peripheral protrusion 10 is an unexpected design defect. If it is a tsuba, trimming the tsuba will not cause any problems, and if the cut surface after trimming is unsightly, by adding a frame-like cover along the outer periphery of the molded product, the cover will also be visually attractive. It becomes an accent of and you can get a preferable product. However, since the outer peripheral convex portion 10 as described above has an elusive shape that comes from the R shape, unlike the brim with a sharp edge, there is a problem that the trimming is not stable even when trimming is performed later. In addition, there is a problem that the outer peripheral convex portion 10 becomes an obstacle and a certain limitation occurs in the shape of the frame-shaped cover, which makes mounting difficult.

When a synthetic leather is used as the decorative sheet 4, a known one can be used, and the synthetic resin as the surface layer is a polyamide resin, a polyurethane resin,
Examples thereof include those using polyamino acid resin, vinyl chloride resin and the like. A woven cloth or the like is used on the back surface of these synthetic leathers, but an adhesive may be formed on the back surface of the woven cloth in order to improve the adhesion between the decorative sheet and the injection resin. As the adhesive, a known adhesive suitable for woven cloth can be used, but when a solvent-drying adhesive is applied to the back surface, the synthetic resin layer on the surface of the synthetic leather should not be deformed or deteriorated by the attack of the solvent. In addition, the solvent type and blending amount are appropriately selected and used. On the other hand, the emulsion type adhesive is advantageous in that it is not attacked by a solvent. Further, a solvent-free heat-sensitive adhesive can be melt-coated, but if the melt viscosity is too high, the adhesive resin does not easily get into the texture of the woven fabric, so that a suitable coating viscosity can be appropriately selected. To use. Since the adhesive melts and softens due to the heat and pressure of the molten resin during the subsequent injection molding, the adhesive does not have to completely penetrate into the texture. Examples of solvent-drying adhesives include rubber adhesives such as chloroprene rubber, and examples of emulsion adhesives include acrylic emulsions and polyvinyl acetate emulsions.
Examples of the heat-sensitive adhesive include those using ethylene / vinyl acetate copolymer resin, polyethylene resin, polyamide resin, polyester resin, petroleum resin and the like.

The material of the injection resin used in the in-mold molding of the present invention is not particularly limited, but known polystyrene resins, ABS (acrylonitrile butadiene copolymerization) resins, polypropylene resins, polyethylene resins, polycarbonate resins, Nylon resin, polyacetal resin, etc. may be appropriately selected and used depending on the decorative sheet of the decorative molded product and the application.

As described above, according to the present invention, for example, a molded product such as a cosmetic case or a spectacle case is an intermediate molded product having a decorative sheet attached to the surface and having a collar on the outer peripheral portion. After making and trimming the brim, the trimmed part is covered with another frame-shaped molded product or a metal frame, etc., and finally, a decorative sheet covers the surface to obtain a molded product of the desired shape without a brim. I can.

[0023]

In the in-mold molding method according to the present invention, the decorative sheet 4 temporarily fixed to the parting surface 23 of the female mold 2 by the vacuum force of the vacuum hole 22 is used to form the male molded product in the mold clamping step. Before the surface 34 comes into contact with the decorative sheet 4, the stripper plate 31 provided on the male mold 3 clamps the periphery of the decorative sheet 4 by the repulsive force of the spring 32 behind the stripper plate 31, and firmly fixes it. Since the male molded product forming surface 34 comes into contact with the decorative sheet 4 and stretches the decorative sheet, the decorative sheet 4 can be stably stretched, and can be stretched to a state in which it is extended more than before.
Further, in order to provide the brim 8 which can be trimmed after molding on the boundary line between the parting surface 23 of the female die 2 and the female molded product forming surface 24, that is, the outer peripheral portion of the molded product, the edge of the boundary line is formed. This makes it possible to very effectively prevent the decorative sheet 4 from breaking during stretching.

[0024]

As described above, the in-mold molding method according to the present invention is remarkable in that it is possible to stretch a decorative sheet such as synthetic leather which is difficult to stretch without causing breaks or wrinkles during stretching. In this way, it becomes possible to perform in-mold molding of a deeper shaped molded product, which has been impossible in the past, and a remarkable effect is exhibited particularly in a decorative sheet which is difficult to stretch. In addition, because synthetic leather can also be used as a decorative sheet for three-dimensional curved surfaces, the surface design feeling such as texture can be obtained on the molded product, which cannot be obtained by the in-mold molding method that simply decorates the surface of the molded product with a printed pattern. It becomes possible to provide it, and it exerts a remarkable effect as a means for dramatically increasing the commercial value of the molded product.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an in-mold molding die.

FIG. 2 is an elevational view of the female mold before mold clamping seen from the male mold side.

FIG. 3 is a vertical cross-sectional view showing the state of the mold after mold clamping and before injection.

FIG. 4 is a vertical cross-sectional view showing the state of the mold after injection.

FIG. 5 is a perspective view and a vertical sectional view showing an example of the shape of the obtained decorative molded product.

FIG. 6 is an explanatory view of a collar shape and a mold of a decorative molded product according to the present invention.

FIG. 7 is an explanatory view of a shape of an outer peripheral portion of a conventional molded product and a mold.

FIG. 8 is an explanatory view of an example in which the outer peripheral portion of the decorative molded product has a bad shape.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 In-mold molding die 2 Female mold 21 Vent hole 22 Vacuum hole 23 Parting surface 24 Female molded product forming surface 25 Molded product outer shape 26 Counterbore 3 Male 31 Stripper plate 32 Support rod 33 Spring 34 Male molded product Forming surface 4 Decorative sheet 5 Molten resin 6 Decorative molded product 61 Peripheral part of molded product 7 Base resin 8 Tsuba 91, 92, 93 Edges with R 94 Edge 10 Peripheral convex part

Claims (4)

[Claims] 1. A decorative molded product in which a decorative sheet is sandwiched between a female mold and a male mold, and a molten resin is injected from the male mold side to attach the decorative sheet to the surface of the molded product. In the in-mold molding method, the male mold is provided with a stripper plate, and when the mold is open, the stripper is located closer to the female mold than the portion closest to the female mold on the male molded product forming surface. The plate is arranged and during the mold clamping process,
The stripper plate comes into contact with the decorative sheet prior to the male molded product forming surface, and the female parting surface and the stripper plate sandwich and fix the decorative sheet molded product, and then the male An in-mold molding method for a decorative molded product, which comprises molding the molded product by injecting a molten resin after the mold is clamped while the surface of the molded product is stretched. 2. A portion corresponding to a peripheral portion of a molded product which is a boundary line between a parting surface of the female mold and a female molded product forming surface corresponds to a decorative sheet side in a mold for molding the molded product. A decorative molded product having a structure with a flange-shaped convex portion on the outer peripheral portion of the molded product, which is obtained by forming a recess in the parting surface along the boundary line between the female parting surface and the female molded product forming surface. . 3. The decorative molded product having a structure having a flange-shaped convex portion on the outer peripheral portion of the molded product according to claim 2, is used as an intermediate product, and the flange-shaped convex portion of the decorative molded product is cut and removed. A method for producing a decorative molded product, which is a final decorative molded product having no flange-shaped convex portion. 4. A decorative molded product manufactured by the manufacturing method according to claim 3, from which a flange-shaped convex portion on the outer peripheral portion is removed.