JPH0477216A - Removing process of deposited powder in slush molding - Google Patents

Abstract

PURPOSE:To remove almost perfectly the powder which is deposited on the surface of the resin layer in the mold wherein slush molding is finished and which is not melted or is semi melted by a method in which the bottom corner of the mold which has been turned over is hitted with hammers and vibration is applied thereto. CONSTITUTION:A heated mold 1 is filled with thermoplastic synthetic resin- powder and a resin layer is molded, and then in the state where the mold 1 is turned over, the thermoplastic synthetic resin powder which is deposited on the resin layer and is not melted or is semi-melted, is removed. Then, the corner part of the bottom of the turned over mold is hitted with hammers 8, 9, and vibration is applied thereto, thereby removing said powder.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for removing adhering powder in lash molding.

BACKGROUND OF THE INVENTION Conventionally, so-called powder slush molding methods, in which slush molding is performed using thermoplastic synthetic resin powder, have been widely practiced for the production of automobile interior materials and the like.

[Problems to be Solved by the Invention] However, such a molding method is disclosed in, for example, JP-A-62-37.
As disclosed in Japanese Patent No. 112, thermoplastic synthetic resin powder such as PVC powder is filled into a heated mold and melted on the surface of the heated mold to form a resin layer. Unmelted or semi-molten powder was deposited on the surface of the resin layer (the surface not in contact with the mold), resulting in an uneven surface, which was unfavorable in terms of quality.

Therefore, after molding the resin layer, pressurized air is blown onto the surface of the resin layer in the inverted mold, or the inverted mold is rotated forward and backward (swinging) at a predetermined angle around the inversion axis. ), or was forced to remove the adhering powder by a method such as
It was not possible to remove it sufficiently.

The present invention has focused on such a problem, and as a result of intensive studies from various aspects in order to solve this problem, by hitting the bottom corner of the inverted mold that was able to mold the resin layer with a hammer. They found that it can be removed satisfactorily.

Means for Solving Problem E] That is, the method for removing adhered powder in slush molding according to the present invention involves filling a heated mold with thermoplastic synthetic resin powder, molding the resin layer, and then removing the mold. In a method for removing unmelted or semi-molten thermoplastic synthetic resin powder attached to the resin layer in an inverted state, the bottom corner of the inverted mold is
It is characterized by being removed by hitting it with a hammer and applying vibration.

[Example] An example of the present invention will be described below. In FIG. 1, 1 is a mold, 2 is a powder box, 3 is a mold carrier, and 4 is a lifter. A pair of ceiling rails that are not installed (rails located at a certain height from the floor)
It is installed so that it can be guided by the front process and transferred in a tact from the previous process to the subsequent process via the illustrated processes A to E.

That is, the pair of support shafts 5 shown in FIG.
A roller rotatably mounted at each predetermined position or a device (not shown) that is supported by the rail and that grips both support shafts 6 with a U-shaped hook and transfers them in a tact manner is used to move them to the predetermined position. It is attached so that it can be transferred to. Note that one end of the support shaft 5 is fixed to the carrier body 6.

Then, when the mold carrier 3 or the carrier main body 6 is tact-transferred from the previous process while being held horizontally, in process A, the mold carrier 3 on which the preheated mold 1 is attached is Powder box 2 is attached. This box 2 contains a predetermined amount of thermoplastic synthetic resin paratha such as PVC powder, which is moved upward by a lifter 4 and attached to the carrier body 6.

The mold 1 and the powder box 2 are each attached to the carrier body 6 via an appropriate lamp mechanism or the like so that they can be attached to and detached from the carrier body 6. In this state, the powder box 2 is opened upward. At the same time, the mold 1 is opened downward, and both openings are communicated with each other through an opening (not shown) penetrating the carrier body 6.

Subsequently, in the next step B, one of the support shafts 5 is driven and rotated, so that the carrier book #6 is also rotated together, the mold 1 is opened upward, and the powder box 2 is opened downward. It will be opened. For this purpose, a thermoplastic synthetic resin paratha is supplied from the inverted powder box 2 to the mold 1, which is melted on the heated mold surface to form a resin layer of a predetermined thickness in the mold 1 by slush molding. This resin layer molding is completed after a certain period of time has elapsed, or thereafter, in the next step C, the support shaft 5 is again driven and rotated, and the mold 1 together with the powder box 2 is rotated clockwise and reversed.

As a result, the excess thermoplastic synthetic resin powder remaining in the mold 1 is discharged to the powder box 2, and the bottom corner 1a of the mold 1 passes through the center of the support shaft 5 (the axis When it is positioned on the vertical line Y, the swinging hammer 8 attached to the ceiling frame 7 (a frame placed at a constant height from the floor) is driven to move the bottom frame 7. Tap part 1a.

Therefore, the mold 1 is vibrated, and unmelted or semi-molten thermoplastic synthetic resin powder adhering to the lower surface of the resin layer in the mold 1 is forcibly shaken off and falls into the powder box 2. do. Note that the reason why the bottom corner 1a of the mold 1 is hammered is because this part is more robust than other parts, so the hammer is hit even harder to prevent deformation of the mold 1. Therefore, the mold 1 can be strongly vibrated and shaken off well.

Also, place the bottom corner 1a of the mold 1 at the center of the support shaft (
The reason why the swinging hammer 8 is placed on a vertical line Y passing through the center of the mold 1 is that the swinging hammer 8 is quickly retracted from the striking point and the mold 1 is struck. This is to enable left rotation.

This completes the beating during the clockwise rotation of the mold carrier 3, or the mold 1 is then rotated counterclockwise in the next step so that the other bottom corner portion 1b is aligned with the center (axis center) of the support shaft 5.
When positioned on the vertical line Y passing through the ceiling frame 7
Similarly, other swinging hammers 9 attached to the frame (frame disposed at a constant height from the floor) are struck.

By hitting twice in this manner, the unmelted or semi-molten thermoplastic synthetic resin paratha attached to the lower surface of the resin layer can be almost completely removed, thereby increasing the paratha recovery rate. It is possible to obtain a molded product with a smooth skin.

Thereafter, the carrier body 6 on which the mold 1 and the powder box 2 are attached, which has been beaten twice, is brought into a horizontal state in the next step E, and then the powder box 2 is separated from the carrier body 6. Lower I with lifter 4
\Moved. In addition, when molding a foam layer on the resin layer therein, the mold 1 is transferred to the next step, a foam layer molding step.

The above has described one embodiment of the present invention, that is, an example of so-called continuous molding in which the mold 1 is sequentially tact-transferred to the subsequent process via the mold carrier 3 for molding. , may be adopted in other general discontinuous cases.

Regarding the hammer hitting the bottom corner portions of the mold 1, instead of hitting the pair of bottom corner portions 1a, lb facing each other, the other pair of bottom corner portions 1c, ld facing each other (the second (see figure), or one bottom corner portion selected from these bottom corner portions 1a to 1d may be struck.

Regarding the timing of tapping, it is not stipulated by the government that the tapping should be performed only when the bottom corner of the mold 1 is positioned on the vertical line Y passing through the center (axis center) of the support shaft 5; As long as the mold 1 is kept inverted (the mold 1 is opened downward), even if the bottom corner is not located on the vertical line Y, it will not work. good.

Regarding hammers, other than rocking hammers, for example,
As shown in FIG. 3, a vertically movable hammer 10 that can be vertically moved up and down via an actuator may be installed, and a swinging hammer 10 that can be mounted also swings in the opposite direction to the rotational direction of the mold. The mold is not limited to being mounted so that it can be rotated, but it may be mounted so that it can swing in the same direction as the rotation direction of the mold. Furthermore, the thermoplastic synthetic resin powder used may be either foamed or non-foamed.

[Effects of the Invention] As described above, according to the present invention, unmelted or semi-molten paratar adhering to the surface of the resin layer (the surface not in contact with the mold) in the mold after slush molding is removed. It can be almost completely removed to obtain a high-quality slush molded product with a smooth surface, and the recovery rate of excess powder can be increased. Note that this effect is especially noticeable when obtaining a molded product with a relatively complex shape, since vibrations can be propagated throughout the mold.

In addition, if the surface of the molded product is smooth, when a foamed resin layer or the like is integrally molded to be laminated thereon, it is possible to obtain the effect that both can be more strongly integrated.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing how adhering balata is removed in continuous slush molding, FIG. 2 is a perspective view of the main part of the mold carrier, and FIG. 3 is a diagram showing how to strike with a vertical hammer.

Claims (1)

[Claims] 1. After filling a heated mold with thermoplastic synthetic resin powder and forming a resin layer, unmolten or semi-molten thermoplastic synthetic resin is attached to the resin layer when the mold is inverted. A method for removing adhering powder in slush molding, characterized in that the powder is removed by hitting the bottom corner of the inverted mold with a hammer and applying vibration.