WO2008001455A1

WO2008001455A1 - Film insert resin molded article and process for producing the same

Info

Publication number: WO2008001455A1
Application number: PCT/JP2006/313061
Authority: WO
Inventors: Satoshi Tamura; Toshitsugu Yajima
Original assignee: Shin-Etsu Polymer Co., Ltd.
Priority date: 2006-06-30
Filing date: 2006-06-30
Publication date: 2008-01-03
Also published as: JPWO2008001455A1; TW200800555A

Abstract

A film insert resin molded article that realizes reducing of any damages on film at injection molding, smooth flowing of molten resin in a metal mold, reducing of sink after molding and easy removing of any bosses. There is provided film insert resin molded article (1) having film (4) for decoration, wherein on the reverse surface opposite to the surface of film (4) bonding side, after injection molding, there is disposed projection (10) remaining as a result of removal of boss generated at the time of feeding of molten resin, and wherein the projection (10) has a sectional area greater than that of the boss and has a bottom face of flat configuration extending in one direction or radial configuration extending in multiple directions.

Description

Specification

Film insert type resin molded body and method for producing the same

Technical field

The present invention relates to a film insert type resin molded body having a decorative film and a method for producing the same.

Background art

[0002] A film insert-type resin molded body is a resin molded body that is integrally formed with a special film by performing injection molding after mounting the decorated special film in a mold. The film insert type resin molded product has the advantages of being able to decorate along the shape of the resin molded product, and being able to obtain a decoration that is resistant to external damage. It is widely used in parts and automobile interior parts.

[0003] However, since high-temperature molten resin is injected toward the film, the film is less likely to be adversely affected. For example, the film is softened by the heat and pressure of the molten resin, and stretched by the flow of the molten resin to be injected and filled. As a result, the film covers the end portion covering the outer surface of the rising portion or the periphery thereof. There is a problem that occurs. In order to solve such a problem, for example, it is curved without contacting the mold at a corner corresponding to the corner formed by the top surface of the rising portion and the outer surface of the rising portion, and the end surface is the inner surface of the rising portion of the molded body. There is known a method of using a film that has been preformed and punched so as to come into contact with the mold at a position corresponding to the edge of the film (see Patent Document 1).

Patent Document 1: Japanese Patent Laid-Open No. 2005-104114 (Claims)

Disclosure of the invention

Problems to be solved by the invention

[0004] In addition to the above problems, there is a problem that when a molten resin in a high temperature and high pressure state is injected toward the film, the film is easily damaged. FIG. 14 is a perspective view of a film insert type resin molded body 100 in which damage is caused to the film. The Finolem 101 exists in the surface direction of FIG. Since the molten resin is injected from the back side of the paper in FIG. 14, the boss 102 remains in the portion that becomes the route of the molten resin. The end 103 of the boss 102 is the molten tree This is the part corresponding to the oil injection port. Injection roller When molten resin in a high-temperature and high-pressure state is injected, a part of the film 101 corresponding to the back side of the terminal end 103 (shaded area in the figure) is damaged, and it looks as if it was burnt when viewed from the front side. become. This situation will be described in more detail with reference to FIG.

FIG. 15 is a diagram for explaining a situation at the time of injection molding. In FIG. 15, the part circled with a dotted line is further enlarged. In the second mold 110, a molten resin path 111 is formed. The first mold 120 is provided with a decorative film 101. The molten resin in the high temperature and high pressure state is injected toward the film 101 from the injection port 112 which is the outlet through the path 111 as indicated by an arrow p. As a result, damage 115 called gate burn occurs in the Finolem 101. Due to the damage 115, when the film insert type resin molded body 100 is viewed from the front side, it becomes a burnt mark 104 shown in FIG. The Finolem 101 is mainly composed of an acrylic resin layer 131, a decorative layer 132, and a backing layer 133 in this order from the first mold 120 side. When the decorative layer 132 is damaged, it becomes a burnt mark 104 shown in FIG.

[0006] In order to prevent such damage to the film 101, a method of increasing the cross-sectional area of the path 111 to reduce the flow rate of the molten resin, and making the injection port 112 wider than the path 111 to increase the flow speed at the time of injection. It is conceivable to reduce the size. However, these methods have the following problems.

[0007] In the case of the method of increasing the cross-sectional area of the path 111, the boss becomes thick. As a result, it is difficult to cut the boss when removing the unnecessary boss. There will be sink marks on the outer surface of the boss. On the other hand, in the method of making the injection port 112 wider than the path 111, the boss formed by the transfer of the path 111 can be easily cut. By simply widening the injection port 112, the protrusion formed by the transfer becomes thick. Therefore, sink marks occur.

[0008] The present invention has been made in view of the above problems, and while reducing damage to the film during injection molding, the molten resin smoothly flows into the mold, reducing sink marks after molding, And it aims at making removal of a boss easy.

Means for solving the problem

[0009] In order to achieve the above object, the present invention provides a film insert having a decorative film. In the molded resin molded body, a protrusion that remains by removing a boss formed when molten resin is supplied after injection molding is provided on the back surface on the opposite side to the surface on which the film is pasted. This is a film insert type resin molded body having a flat bottom surface that is larger than the cross-sectional area of the boss and extends in one direction or a radial shape that extends in a plurality of directions. For this reason, the molten resin can be smoothly flowed into the mold, and the flow rate of the molten resin is reduced at the projections, so that damage to the film can be reduced. In addition, it is possible to easily remove only the boss while leaving the protrusion. Furthermore, since the volume of the protrusion can be made relatively low, sink marks are unlikely to occur.

[0010] Another invention of the present invention is a film insert-type resin molded body in which the protrusion in the previous invention is a protrusion having a shape in which the area increases from the tip to the bottom. For this reason, the projections are those in which the molten resin flows and solidifies without involving air.

[0011] Another invention of the present invention is a film insert type resin molded body in which the tip of the protrusion in each of the previous inventions has an area larger than the cross-sectional area of the boss. For this reason, since there is a clear step at the boundary between the protrusion and the boss, it is easy to cut and remove the boss.

[0012] Another aspect of the present invention is a method for producing a film insert-type resin molded body having a decorative film, wherein the decorative film is disposed on the inner side of the first mold. A second mold having an opening area larger than the cross-sectional area of the path of the molten resin and having a molten resin injection die having a flat shape extending in one direction or a radial shape extending in a plurality of directions; A mold placement step for placing the mold above the mold opening, a molten resin supply step for injecting the molten resin from the injection port, and a mold separation step for separating the first mold and the second mold. It is set as the manufacturing method of the film insert type resin molding which has. For this reason, if this method for producing a film insert-type resin molding is adopted, the molten resin can be smoothly flowed into the mold, and the flow rate of the molten resin at the projections becomes small. Damage can be reduced. Furthermore, since the volume of the protrusion can be made relatively low, sink marks are unlikely to occur.

[0013] Further, another invention of the present invention is a film insert type resin molding in which the shape of the injection port in the previous invention is such that the area increases from the connection surface with the end surface of the path toward the opening surface of the injection port. It is a manufacturing method of the body. Therefore, this film insert type resin molded body When this manufacturing method is adopted, the molten resin flows without involving air when it moves from the connection surface with the terminal end surface of the path to the opening surface of the injection port. As a result, the protrusion formed by the transfer of the injection port becomes a thing that does not involve air.

[0014] Further, another invention of the present invention is a film insert type resin molded body in which the injection port of each of the previous inventions is an injection port in which an area of a connection surface with a terminal end surface of the path is larger than a cross-sectional area of the path. The manufacturing method. For this reason, when this method for producing a film insert-type resin molding is adopted, a clear step is formed at the boundary between the protrusion and the boss after the molten resin is solidified. It becomes easy.

The invention's effect

[0015] According to the present invention, in a film insert type resin molded body having a decorative film, damage to the film in injection molding is reduced, and the molten resin is allowed to flow smoothly into the mold. Sinking after molding can be reduced and boss removal can be facilitated.

Brief Description of Drawings

FIG. 1 is a perspective view of a film insert type resin molded body according to an embodiment of the present invention.

FIG. 2 is an enlarged view of the protrusion shown in FIG.

FIG. 3 is a diagram showing a part of a process for manufacturing the film insert type resin molded body shown in FIG. 1.

[FIG. 4] FIG. 4 is a view showing a part of a film insert type resin molded body having a runner and a submarine gate solidified in a part of a molten resin supply section and a boss above a protrusion.

FIG. 5 is an enlarged view of a portion surrounded by a dotted line indicated by X in FIG.

[Fig. 6] Fig. 6 is a view showing a state in which the injection port is viewed from the convex portion side of the second mold.

FIG. 7 is a flowchart showing the main manufacturing steps of a film insert type resin molded body.

FIG. 8 is a view showing a film insert type resin molded body before the boss is removed.

FIG. 9 is an enlarged view showing the boss and the protrusion shown in FIG. FIG. 10 is a view showing a modified example other than the combination of the protrusion and the boss shown in FIG.

FIG. 11 is a view showing a modified example other than the combination of the protrusion and the boss shown in FIG. 12] FIG. 12 is a view showing a modified example other than the combination of the protrusion and the boss shown in FIG. 13] FIG. 13 is a view showing a modified example other than the combination of the protrusion and the boss shown in FIG.

FIG. 14 is a perspective view of a film insert type resin molded body in which damage is caused to the film.

15] FIG. 15 is a diagram for explaining the situation at the time of injection molding.

Explanation of symbols

-Tote type resin molding

2 opening

3 holes

4 Huinolem

10 protrusion

11 Thin plate

11a Top surface (connection surface)

l ib bottom

12

13

14

15 Boss

20 mold

21 First mold

22 Second mold

23 Recess

24 Convex

25 Clearance

30 Molten resin supply section

31 32 Injection port

40 runners

41 Submarine Gate

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, preferred embodiments of a film insert type resin molded body and a method for producing the same according to the present invention will be described in detail with reference to the drawings. In this embodiment, a vertical film insert type resin molded body having a hole on the top surface, in which a decorative film is inserted into a part of the surface from the top surface to the side surface, is taken as an example. ,explain. However, the film insert-type resin molded body according to the present invention is not limited to the film insert-type resin molded body of the above form.

FIG. 1 is a perspective view of a film insert type resin molded body 1 according to an embodiment of the present invention.

The film insert type resin molded body 1 is a bowl-shaped resin molded body having an opening 2, and a rectangular hole 3 is provided on the top surface thereof. A decorative film 4 is inserted on the top and part of the side. The film insert type resin molding 1 has a three-layer structural force with a resin molding made of PC / ABS alloy and a decorative layer sandwiched between acrylic resin (top film) and ABS resin (backing layer). Consists of film 4 and The backing layer is a layer for protecting the decorative layer from the molten resin and simultaneously welding the film and the injection molded resin at the time of injection molding. Hereinafter, the top surface is referred to as “front surface”, and the surface on the opening 2 side is referred to as “back surface”. Two protrusions 10 and 10 are formed in the vicinity of the hole 3 on the back surface of the film insert-type resin molded body 1 at positions facing the hole 3. The protrusion 10 is left after the boss is removed after the injection molding.

FIG. 2 is an enlarged view showing the protrusion 10 shown in FIG.

The protrusion 10 has a shape in which the end surface of the triangular thin plate 12 is fixed to the trapezoidal surface of the substantially trapezoidal thin plate 11. The length W1 of the upper surface 11a of the thin plate 11 is shorter than the length W2 of the lower surface l ib of the thin plate 11. The protrusion 10 is formed by diverting the molten resin flowing from the direction of the arrow L during the injection molding in the three directions of the arrow Ll, the arrow L2, and the arrow L3.

FIG. 3 shows a part of a process for manufacturing the film insert type resin molded body 1 shown in FIG. It is a figure.

[0024] The mold 20 for injection molding includes a first mold 21 having a recess 23 having an inner surface along the surface of the film insert type resin molded body 1, and a film insert type resin molded body 1. A second mold 22 having a convex portion 24 having a surface along the back surface is mainly constituted. Prior to setting the mold 20, the film 4 is laid in the recess 23 of the first mold 21. Next, the convex portion 24 of the second mold 22 is opposed to the concave portion 23 of the first mold 21 with a gap 25 therebetween. The second mold 22 has two molten resin supply sections 30 for opening the surface of the convex portion 24 through the inside of the second mold 22 and injecting the molten resin toward the gap 25. 30 is formed. Note that only a part of the molten resin supply sections 30 and 30 is shown in FIG.

[0025] FIG. 4 shows a part of a film insert type resin molded body 1 having a runner 40 and a submarine gate 41 solidified in a part of the molten resin supply parts 30, 30, and a boss 15 above the protrusion 10. FIG.

The film insert type resin molded body 1 according to this embodiment includes a runner 40 and a submarine gate 41 on the upstream side of the molten resin supply from the boss 15. The runner 40 and the submarine gate 41 are removed when the second mold 22 and the first mold 21 are separated. The boss 15 and the protrusion 10 are still left on the film insert mold resin molded body 1 side when the second mold 22 and the first mold 21 are separated. If the boss 15 is too thick, it causes sink marks. Therefore, the boss 15 is preferably formed in a columnar body having a substantially semicircular cross section. Since the boss 15 is an unnecessary portion for the film insert type resin molded body 1, it is removed by a method such as cutting after the molding. As a result, as shown in FIGS. 1 and 2, only the protrusion 10 connected to the lower side of the boss 15 remains in the film insert type resin molded body 1.

FIG. 5 is an enlarged view of a portion surrounded by a dotted line indicated by X in FIG. FIG. 5 shows a state in which the mold 20 is viewed from the direction indicated by A in FIG.

The molten resin supply unit 30 includes a molten resin path 31 and an injection port 32 that is connected to the end surface of the path 31 and opens to the convex portion 24 side. The path 31 is connected to an injection port 32 having a width W1 wider than the width D. The injection port 32 gradually increases in width from the connection surface with the end surface of the path 31 and has a shape of an endless spreading type on the opening surface having the width W2. For this reason, when the molten resin is injected from the passage 31 through the injection port 32, the flow velocity is small. At the same time, the molten resin can be injected without entraining air. Thus, since the flow rate of the molten resin injected from the injection port 32 is smaller than the flow rate when passing through the path 31, damage to the film 4 can be reduced. Also, the protrusion 10 formed by transferring the shape of the injection port 32 is a resin molded body with few bubbles, and thus has excellent strength. As a result, when the boss 15 is bent and cut away, the boss 15 can be cut off reliably without damaging the protrusion 10.

FIG. 6 is a diagram showing a situation where the injection port 32 is viewed from the convex portion 24 side of the second mold 22.

[0030] The injection port 32 opens in a substantially T-shape. The opening surface is composed of a rectangular surface having a length W2 and a rectangular surface extending vertically from the center of the rectangular surface by a length (W2) Z2. Therefore, the molten resin is injected from the path 31 so as to spread in three directions according to the opening shape of the injection port 32. As a result, the flow rate when the molten resin contacts the film 4 can be reduced, and at the same time, the flow rate of the molten resin flowing in the gap 25 in three directions can be increased to some extent. Therefore, the molten resin flows smoothly through the gap 25 in the mold 20 without damaging the film 4. As a result, a part of the film 4 does not appear to be burned from the front side, and the resin is filled throughout the gap 25. In addition, if the width of the injection port 32 (the portion corresponding to the thickness of the thin plate 11 and the thin plate 12) is in the range of 1/2 to 2/3 with respect to the height H of the gap 25, a large thick portion is formed. It is possible to suppress the occurrence of sink marks.

FIG. 7 is a flowchart showing main manufacturing steps of the film insert type resin molded body 1. FIG. 8 is a view showing the film insert type resin molded body 1 before the boss 15 is removed. FIG. 9 is an enlarged view of the boss 15 and the protrusion 10 shown in FIG.

[0032] First, the decorative film 4 is placed inside the first mold 21 (step S101: film placement step). Next, the mold 20 is set with the convex part 24 of the second mold 22 facing the concave part 23 of the first mold 21 (step S102: mold arranging step). Next, molten resin composed of 240 to 260 ° C PCZA BS alloy is injected into the gap 25 between the first mold 21 and the second mold 22 from the injection port 32 (Step S103: Supply of molten resin). Process). During the molten resin supply process, the mold 20 is kept at 40-60 ° C. Next, after the molten resin is solidified, the first mold 21 and the second mold 22 are separated (step S104: mold separation step). The film insert-type resin molded body 1 immediately after step S104 is a resin molded body having the form shown in FIG. 8, and the boss 15 is formed. Next, the boss 15 extending from the protrusion 10 is removed from the protrusion 10 (step S105). As shown in FIG. 9, the cross-sectional area S 1 of the terminal surface of the boss 15 on the upper side of the protrusion 10 (the area shown by hatching in FIG. 9) is smaller than the area S2 of the upper surface 11a of the protrusion 10, The boss 15 can be easily cut off at the upper surface 11a. Thus, the film insert type resin molded body 1 is completed.

FIG. 10, FIG. 11, FIG. 12, and FIG. 13 are diagrams showing modifications of the combination of the protrusion 10 and the boss 15. In these figures, the boss 15 is indicated by a one-dot chain line in consideration of the fact that the boss 15 is finally removed.

[0034] As shown in FIG. 10, the projection 10 may have a form in which two substantially trapezoidal thin plates 11 are crossed. When the shape of the injection port 32 of the second mold 22 is designed so that the projection 10 having such a shape is formed, the molten resin flows from the injection port 32 in four directions. Depending on the form of the film insert type resin molded body 1 and the position of the injection port 32, an injection port 32 that can form the protrusion 10 shown in FIG. 10 may be adopted.

Further, as shown in FIG. 11, the shape of the protrusion 10 may be a shape in which the end face of the rectangular parallelepiped thin plate 14 is fixed to the widest side surface of the rectangular parallelepiped thin plate 13. When the shape of the injection port 32 of the second mold 22 is designed so that the protrusion 10 having such a shape is formed, the molten resin flows from the injection port 32 in three directions. Furthermore, since the areas above and below the protrusion 10 are the same, the molten resin that has flowed out of the path 31 reduces its flow rate when it enters the injection port 32, and exits the injection port 32 at a substantially constant speed. It is also acceptable to use protrusions with a cross shape of two rectangular parallelepiped thin plates 13, 14.

In addition, as shown in FIG. 12, the shape of the protrusion 10 is the same as the shape of the protrusion 10 shown in FIG. 2, and the area S1 of the end face of the boss 15 (the area indicated by the oblique lines in FIG. 12) is The area S2 of the upper surface 11a of the protrusion 10 may be the same.

Furthermore, as shown in FIG. 13, the protrusion 10 may be composed only of the substantially trapezoidal thin plate 11.

When the shape of the injection port 32 of the second mold 22 is designed so that the projection 10 having such a shape is formed, the molten resin flows from the injection port 32 in two directions. Depending on the form of the film insert type resin molding 1 and the position of the injection port 32, the projection 10 shown in Fig. 13 can be formed. Such injection port 32 may be adopted.

[0038] In this manner, various forms of the injection port 32 can be employed according to the form of the film insert type resin molded body 1 and the position of the injection port 32. As a result, the projections 10 of various forms can be formed. . The position of the injection port 32 is preferably provided so that the molten resin joins at a place other than the film 4. This is because it is necessary to prevent the film 4 from being wrinkled.

[0039] The power described above for the preferred embodiment of the present invention The present invention is not limited to the above-described embodiment, and can be implemented in various modified forms.

[0040] For example, by changing the shape of the injection port 32, the shape of the protrusion 10 can be changed to two different straight lines corresponding to the direction in which the molten resin flows in addition to the T-shaped, cross-shaped, and linear shapes. Various shapes such as a shape in which straight lines are orthogonal to each other and a star shape can be used. Further, the angle that spreads from the upper side to the lower side of the injection port 32 can be appropriately changed according to the type of resin to be injected, the shape or size of the film insert type resin molding, and the like.

[0041] The resin molded body may be made of a resin other than PC / ABS alloy, for example, an ABS resin, a polypropylene resin, or a biodegradable resin (for example, polylactic acid). The film 4 is not limited to a structure in which a decorative layer is sandwiched between an acrylic resin and an ABS resin. The film 4 has a backing layer that is compatible with the resin used in the resin molding. As long as the film 4 has any layer structure, the film 4 may be used. In addition, a film preliminarily molded as the FINEREM 4 may be used.

[0042] In addition, gates other than the submarine gate 41, for example, other gates such as a side gate, an overlap gate, a pinpoint gate, and a direct gate may be adopted. The area S2 of the tip (upper surface 11a) of the protrusion 10 can be made smaller than the area S1 of the end face of the boss 15. The flow rate of the molten resin temporarily increases as soon as it enters the entrance of the injection port 32 from the path 31. However, if the injection port 32 spreads toward the lower opening side, the flow rate of the molten resin immediately decreases. Become. For this reason, damage to the film 4 can be sufficiently reduced. Example

Next, examples of the present invention will be described in comparison with comparative examples.

[0044] 1. Manufacturing conditions' Evaluation conditions

(Example) The shape of the injection port formed in the second mold was the same as that shown in FIG. The opening area of one morphism outlet and 46. 0 mm ^2, the second mold, is provided a total of three exit. The projecting volume was 300 cm ³ . The resin to be injected was PC / ABS alloy and injected for 3.0 seconds at a temperature in the range of 240 to 260 ° C. During injection molding, the mold temperature was kept at 40-60 ° C. The film used was a three-layer film with a silver decorative layer sandwiched between acrylic resin and ABS resin. The obtained film insert type resin molded product was evaluated for the degree of damage to the film (called gate burn) and whether or not the resin was sufficiently filled in the injection volume. The specific evaluation criteria for gate burn were “◯” when there was little damage, “△” when there was little damage, and “X” when there was heavy damage. The degree of resin filling into the injection volume was evaluated as “short” when the injection volume was not sufficient.

[0045] (Comparative Example 1)

In the second mold, the passage having a half-moon shaped cross section was extended as it was to be an injection port. The opening area of one injection port and 4. 6 mm ^2, the second mold, is provided a total of three exit. The injection volume, the resin to be injected, the temperature of the molten resin at the time of injection, the temperature of the mold during injection molding, and the film were the same as in the examples. The injection time was 2.0 seconds. Evaluation was performed on the same items as in the examples.

[Comparative Example 2]

The conditions other than the injection time of 2.8 seconds were the same as those in Comparative Example 1. Evaluation was performed on the same items as in the examples.

[0047] (Comparative Example 3)

The conditions other than the injection time of 6.1 seconds were the same as those in Comparative Example 1. Evaluation was performed on the same items as in the examples.

[0048] (Comparative Example 4)

The conditions other than the injection time of 14.0 seconds were the same as those in Comparative Example 1. Evaluation was performed on the same items as in the examples.

[0049] (Comparative Example 5)

Extend the path with a half-moon shaped cross section to the second mold as it is and the injection port did. The opening area of one injection port and 13. 4 mm ^2, the second mold, is provided a total of three exit. The injection volume, the resin to be injected, the temperature of the molten resin at the time of injection, the temperature of the mold during injection molding, and the film were the same as in the examples. The injection time was 2.8 seconds. Evaluation was performed on the same items as in the examples.

[0050] (Comparative Example 6)

The conditions other than the injection time of 8.0 seconds were the same as those in Comparative Example 5. Evaluation was performed on the same items as in the examples.

[0051] 2. Evaluation results' Discussion

Table 1 shows the evaluation results of the film insert type resin moldings obtained under the conditions of Examples and Comparative Examples:! -6.

[0052] [Table 1]

[0053] As shown in Table 1, under the conditions of Comparative Examples 1 to 6, gate burn occurred. The flow rate through the gate is reduced by adjusting the injection time longer. Did not come. In the case of Comparative Example 3, Comparative Example 4 and Comparative Example 6, since the injection time was too long, solidification of the molten resin progressed and the fluidity decreased, resulting in insufficient filling in the injection volume. “Short”.

On the other hand, in the case of the conditions of the example, the flow rate through the gate was sufficiently small, and the occurrence of gate burn was not confirmed. The molten resin was sufficiently filled into the injection volume.

[0055] From the above results, even when the path cross-sectional area capable of forming a boss with a thickness that does not hinder cutting and removal was adopted and the injection time was changed, gate burn occurred. When the injection time was lengthened, the flow velocity through the goot decreased and the gate burn tendency tended to decrease, but on the other hand, the molten resin was insufficiently filled. From this, it is considered that the adjustment of the injection time cannot achieve both prevention of gate burn and sufficient filling of the molten resin.

[0056] On the other hand, when the injection port continuing from the path is shaped as in the embodiment, the flow velocity of the gate passage can be sufficiently reduced, and the flow velocity of the molten resin can be increased at the branched point. As a result, it is considered that both gate burn prevention and sufficient filling of molten resin could be achieved.

Industrial applicability

[0057] The present invention can be used in industries that manufacture or use electronic devices, automobile interior parts, and the like that use a resin molded body in which a decorative film is inserted by injection molding.

Claims

The scope of the claims

[1] In a film insert type resin molded body having a decorative film,

On the back surface opposite to the surface on which the film is pasted, a protrusion remaining after removing the boss formed when the molten resin is supplied after injection molding,

The film insert-type resin molded body, wherein the protrusion has a flat bottom surface that is larger than a cross-sectional area of the boss and extends in one direction or a radial shape that extends in a plurality of directions.

[2] The film insert-type resin molded body according to [1], wherein the protrusion has a shape whose area increases from the tip to the bottom.

[3] The film insert-type resin molded body according to claim 1 or 2, wherein a tip of the protrusion has a larger area and a larger area than a cross-sectional area of the boss.

[4] In the method for producing a film insert type resin molded body having a decorative film, the film placement step of arranging the decorative film inside the first mold, and the cross-sectional area of the route of the molten resin A second mold having an injection port having a large opening area and having a molten resin injection rod having a flat shape extending in one direction or a radial shape extending in a plurality of directions is defined as an opening of the first mold. A mold placement step for placing the resin above, a molten resin supply step for injecting a molten resin from the injection port,

A mold separating step for separating the first mold and the second mold;

A method for producing a film insert-type resin molded product, comprising:

[5] The film insert according to claim 4, wherein the injection port has a shape in which an area increases from a connection surface with the end surface of the path toward an opening surface of the injection port. A method for producing a to-mold resin molding.

6. The film insert-type resin molded body according to claim 4 or 5, wherein a connection surface of the injection port with a terminal end surface of the path has an area larger than a cross-sectional area of the path. Method.