JPH04339613A - Device and method for simultaneous injection and decoration in mold - Google Patents

Abstract

PURPOSE:To remove the occurrence of warpage and crack, while a decorative sheet is prevented from being elongated, when a decorated sheet is fitted into a cavity. CONSTITUTION:The female mold 1 with recessed part 1a is arranged oppositely to the male mold 2 with projected part 2a. A decorated sheet 3 is provided movably between the female mold 1 and the male mold 2. The hole 2b which communicates the surface of the projected part 2a to its outside, is bored through the male mold 2. A vacuum-generating device is connected to the outside of the hole 2b. When the projected part 2a is engaged with the inside of the recessed part 1a, they are engaged with each other in the state where the decorated sheet 3 is preliminarily sucked from the hole 2b.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-mold injection simultaneous painting apparatus and method, and more particularly to an in-mold injection simultaneous painting apparatus and method for injecting resin after a decorative sheet is aligned with a mold.

0002

2. Description of the Related Art FIG. 6 is a schematic cross-sectional view of a conventional in-mold injection simultaneous painting device. Reference numeral 101 in the figure is a female mold, and this female mold 101 has a recess 101a formed therein. Further, a male mold 102 is disposed opposite to the female mold 101, and this male mold 102 is formed with a convex portion 102a that can be engaged with the recessed portion 101a. Moreover, this recess 10
A painted sheet 103 is provided between 1a and the convex portion 102a so as to be movable in the direction of the arrow in the figure. This illustrated sheet 103 is wound around a sheet roll 104, and the winding roll 1
It is wound up by 05. In addition, the sheet roll 104
Nip rolls 106 and 1 are provided between the take-up roll 105 and the take-up roll 105.
07 is provided, and these nip rolls 106, 10
7, the illustrated sheet 103 is conveyed. Furthermore, two bar grooves 101b, 101b are formed in the female mold 101. Clamp bars 108, 108 that can be engaged with the bar grooves 101b, 101b are provided.

[0003] In the in-mold injection simultaneous decoration apparatus constructed as described above, the nip rolls 106 and 107 are driven to cause the decoration sheet 103 to travel in the direction of the arrow in the figure. Then, it is positioned at a predetermined position and stopped. Thereafter, when the two clamp bars 108, 108 are simultaneously moved to the left in the figure, the illustrated sheet 103 is engaged with the bar grooves 101b, 101b (FIG. 7). In this state, by moving the female die 101 to the right in the figure, the convex portion 102a is inserted into the concave portion 101a (FIG. 8). At this time, the illustrated sheet 103 is attached to the clamp bar 108.
, 108, since both ends (upper and lower ends in the figure) are clamped, it will be stretched. After that, male type 10
Resin is injected from the resin injection port No. 2, and the decorated sheet 103 is further stretched by the pressure and heat of the injected resin, and finally follows the shape of the surface of the female mold 101.

0004

However, in the in-mold injection simultaneous decoration device configured as described above, when the male mold is inserted into the female mold and the resin is injected, the decorative sheet is stretched, which causes wrinkles. , there are problems such as tearing. The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide an in-mold injection simultaneous decoration device that can prevent wrinkles and tears from occurring on a decorative sheet.

[0005]

[Means for Solving the Problems] The present invention provides a female mold having a recess, a male mold having a convex part that cooperates with the recess to form a cavity, and a gap between the male mold and the female mold. In the in-mold injection simultaneous painting device, which is equipped with a conveying painting sheet, the male mold is provided with a hole that communicates the cavity with the outside of the male mold, and a vacuum generator is provided on the outside of the hole. connected, and the painted sheet is attracted to the convex part and engaged in the concave part by operating the vacuum generator; a female mold having a concave part cooperates with the concave part to form a cavity; In an in-mold injection simultaneous painting apparatus comprising a male mold having a convex portion to be formed, and a decorative sheet conveyed between the male mold and the female mold, the female mold and the male mold have the cavity and the decorative sheet, respectively. A hole communicating with the outside of the female mold and the male mold is bored, a vacuum generator is connected to the outside of the hole of the female mold, and a vacuum generator and a compressed air generator are connected to the outside of the hole of the male mold. The device or leak valve is connected, and the painted sheet is attracted to the convex portion and engaged in the concave portion by the operation of the vacuum generator, and then the compressed air generator or leak valve on the male side Activate the vacuum generator on the female mold side to suck the painted sheet from the male mold side to the female mold side; engage the protrusion of the male mold in the recess of the female mold. match,
In the in-mold injection simultaneous painting method in which a decorative sheet is positioned in a cavity formed by the concave portion and the convex portion, and molten resin is injected into the cavity, the cavity and the outside of the male mold are attached to the male mold. drilling a communicating hole, connecting a vacuum generator to the outside of the hole, positioning the illustrated sheet at a predetermined position, activating the vacuum generator, and adsorbing the illustrated sheet to the convex portion; Engaging the concave portion with the convex portion while pulling in both ends in the conveying direction of the illustrated sheet attracted to the convex portion; engaging the female concave portion and the male convex portion; and engaging the female concave portion and the male convex portion; The vacuum generator on the male mold side is stopped, the compressed air generator is activated or the leak valve is opened to blow compressed air from the hole on the male mold, and if necessary, the vacuum generator on the female mold side is activated to release the female mold. The illustrated sheet is attracted from the male mold side to the female mold side by suction through the holes on the mold.

[0006]

[Operation] The illustrated sheet is conveyed and positioned at a desired position. Here, the vacuum generator is activated. Then,
The painted sheet is attracted to the protrusion of the male mold. In this state, the female and male molds are brought together to form a cavity. Then, by injecting molten resin into this cavity,
Obtain a painted molded product.

[0007] Furthermore, when a compressed air generator is installed,
Activate the compressed air generator to blow compressed air from the hole in the male mold, activate the vacuum generator on the female mold side to attract the painted sheet to the female mold side, and in this state inject the molten resin into the cavity. do.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a perspective view of an in-mold injection simultaneous painting device according to the present invention. Reference numeral 1 in the figure is a female mold, and this female mold 1 has a recess 1a formed therein. Further, a male mold 2 is disposed opposite to the female mold 1. This male die 2 is formed with a convex portion 2a that can be engaged with the concave portion 1a of the female die 1. Further, a painted sheet 3 is disposed between the female mold 1 and the male mold 2 so as to be movable in the direction of the arrow in the figure. This illustrated sheet 3 is wound around a sheet roll 4 provided above the male die 2 in the figure, and is wound up by a take-up roll 5 provided below the male die 2 in the figure. Further, a nip roll 6 is provided at a position spaced apart from the sheet roll 4 in the horizontal direction. Furthermore, a nip roll 7 is provided at a position spaced apart from the take-up roll 5 in the horizontal direction. A sensor 8 is disposed near the nip roll 7 to detect the positioning mark on the illustrated sheet 3 and control the driving of the nip rolls 6 and 7. Further, the male die 2 is provided with a hole 2b. As shown in FIG. 2, this hole 2b has a plurality of suction ports provided over the entire surface of the convex portion 2a of the male mold 2, and a main flow portion that communicates the suction ports with the outside of the male mold 2. It consists of Furthermore, this hole 2
A tube (not shown) is connected to the outside of b, and a vacuum generator (not shown) is connected to the tip of this tube. Further, the male die 2 is provided with a resin injection port 2c for injecting molten resin into the cavity (FIG. 2).

The operation of the in-mold injection and simultaneous painting apparatus constructed as described above will be described in detail below. Drive the nip rolls 6 and 7 to move the illustrated sheet 3 in the direction of the arrow in FIG.
be transported. When the sensor 8 detects the positioning mark on the illustrated sheet 3, the conveyance of the illustrated sheet 3 is stopped. In this state, a vacuum generator (not shown) is activated to suck the illustrated sheet 3 from the hole 2b, thereby adhering the illustrated sheet 3 to the surface of the convex portion 2a (FIG. 2). And female type 1
is moved to the right in FIG. 2 to engage the convex portion 2a in the concave portion 1a (FIG. 3). A cavity 9 is thereby formed. At this time, since the illustrated sheet 3 is adsorbed to the convex portion 2a, the illustrated sheet 3 is covered by the height of the convex portion 2a as shown in FIG.
It will be pulled in the direction of the middle arrow. Thereafter, the operation of the vacuum generator (not shown) is stopped, and molten resin is injected into the cavity 9 from the resin injection port 2c (FIG. 4). As a result, the illustrated sheet 3 is separated from the surface of the convex portion 2a and is pressed against the inner surface of the concave portion 1a. Furthermore, a decorated molded product is obtained by injecting molten resin between the decorated sheet 3 and the convex portions 2a.

In the above embodiment, the sheet roll 4 and the take-up roll 5 are provided above and below the male mold 2 in FIG. 2, but as shown in FIG. You may also do so. Although not shown, in the above device, a leak valve or a compressed air generator is also connected to the tip of the pipe connected to the suction port of the male mold 2, and a leak valve or a compressed air generator is also connected to the male mold on the female mold 1. A similar suction port, pipe material, and vacuum generator were provided, and after the male mold 2 and female mold 1 were engaged, the vacuum generator on the female mold 1 side was activated, and the painted sheet was sucked into the female mold 1 side. Afterwards, molten resin may be injected. Note that the leak valve here refers to a valve that injects external air into the vacuum system.

[0011]

[Effects of the Invention] As described above, the illustrated sheet is vacuum-adsorbed to the convex portion of the male die, and then the convex portion is engaged in the concave portion of the female die, so that the illustrated sheet does not stretch. Therefore, wrinkles and tears can be prevented. In addition, since the painted sheet is already released from the male convex portion and preliminary stretching is added before resin injection, wrinkles and tears caused by sudden pressure during resin injection can be more reliably prevented. It has the following effects:

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view of an in-mold injection simultaneous painting device according to the present invention.

FIG. 2 is a schematic cross-sectional view of an in-mold injection simultaneous painting device according to the present invention.

FIG. 3 is a schematic cross-sectional view of an in-mold injection simultaneous painting device according to the present invention.

FIG. 4 is a schematic cross-sectional view of the in-mold injection simultaneous painting device according to the present invention.

FIG. 5 is a schematic cross-sectional view of an in-mold injection simultaneous painting device according to another embodiment of the present invention.

FIG. 6 is a schematic cross-sectional view of a conventional in-mold injection simultaneous painting device.

FIG. 7 is a schematic cross-sectional view of a conventional in-mold injection simultaneous painting device.

FIG. 8 is a schematic cross-sectional view of a conventional in-mold injection simultaneous painting device.

[Explanation of symbols]

1...Female type 1a...concavity 2...male type 2a...Protrusion 2b...hole 3...Painted sheet

Claims (4)

[Claims] 1. A female mold having a recess, a male mold having a convex part that cooperates with the recess to form a cavity, and a painted sheet conveyed between the male mold and the female mold. In the in-mold injection simultaneous painting device, the male mold is provided with a hole that communicates the cavity with the outside of the male mold, a vacuum generator is connected to the outside of this hole, and the painted sheet is By operating the vacuum generator,
An in-mold injection simultaneous painting device characterized in that it is attracted to the convex portion and engaged in the concave portion. 2. A female mold having a recess, a male mold having a convex part that cooperates with the recess to form a cavity, and a painted sheet conveyed between the male mold and the female mold. In the in-mold injection simultaneous painting device, the female mold and the male mold are provided with a hole that communicates the cavity with the outside of the female mold and the male mold, respectively, and a vacuum is generated on the outside of the hole of the female mold. A device is connected, a vacuum generator and a compressed air generator or a leak valve are connected to the outside of the male hole, and the painted sheet is attracted to the convex portion by the operation of the vacuum generator, After being engaged in the recess, the compressed air generator or leak valve on the male mold side is operated, and the vacuum generator on the female mold side is activated as necessary, and the illustrated sheet is moved from the male mold side. An in-mold injection and simultaneous painting device characterized by causing suction to the female mold side. [Claim 3] A convex part of the male mold is engaged with a concave part of the female mold,
In the in-mold injection simultaneous painting method in which a decorative sheet is positioned in a cavity formed by the concave portion and the convex portion, and molten resin is injected into the cavity, the cavity and the outside of the male mold are attached to the male mold. drilling a communicating hole, connecting a vacuum generator to the outside of the hole, positioning the illustrated sheet at a predetermined position, activating the vacuum generator, and adsorbing the illustrated sheet to the convex portion; An in-mold injection simultaneous painting method characterized in that the concave portion is engaged with the convex portion while drawing both ends in the conveying direction of the decorated sheet attracted to the convex portion. 4. The concave part of the female mold and the convex part of the male mold are engaged, the vacuum generator on the male mold side is stopped, and the hole on the male mold is closed by activating the compressed air generator or opening the leak valve. Then, if necessary, activate the vacuum generator on the female mold side to draw suction from the hole on the female mold to draw the painted sheet from the male mold side to the female mold side. Features an in-mold injection and simultaneous painting method.