JPH0731326U - Powder slush mold - Google Patents

Abstract

(57) [Summary] [Purpose] No mold release agent is required in the powder slush mold made of powdered plastic material that is molded by rotating the mold in the mold closed state with the seal plate of the powder box in contact with the mold. To do. [Structure] The middle portion of the lever 10 is pivotally supported by the peripheral portion 22a of the die 22, and a notch 23 is formed inward of the contact position of the seal plate 53 in the peripheral portion 22a. Closure block 1 for closing the notch 23
2 is provided, and a driven piece 13 is provided toward the powder box side at the rear end of the lever 10 occupying a position closer to the outside than the contact position. The lever 10 has a tip portion around the peripheral portion 2
A spring 15 is attached which biases the 2a in the direction away from it.
On the seal plate 53, a driving piece 17 for driving the driven piece 13 against the spring 15 is provided so as to project so that the notch 23 is closed by the closing block 12 in the mold closed state.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a powder slush mold made of a powdered plastic material which is rotated and molded in a mold closed state in which a seal plate of a powder box is brought into contact with a mold.

[0002]

[Prior art]

 The resin material such as powdered vinyl chloride used for powder slush molding contains a release agent in order to facilitate demolding after melt-molding with a mold. Therefore, in order to prevent the gloss from being caused by the release agent component being laminated on the mold and being thickly transferred to the surface of the molded product, the mold surface is cleaned after every mold release or after several moldings. is doing.

[0003]

[Problems to be solved by the device]

 For this reason, not only a cleaning device was required, but also a preliminary mold was required for continuous molding.

It is therefore an object of the present invention to provide a powder slush mold of the kind mentioned at the beginning which may dispense with a release agent.

[0005]

[Means for Solving the Problems]

 In order to achieve this object, the present invention is housed in a powder box by rotating in a mold closed state in which a seal plate of the powder box is brought into contact with a horizontal peripheral portion of the mold from an orthogonal direction. In a powder slush molding die that adheres and melts powdered plastic material to a heated mold, the middle part of the lever is pivotally supported on the peripheral part and the seal plate abuts on the peripheral part. A notch is formed closer to the inside than the position, and a closing block that closes the notch is provided at the tip of the lever, and the rear end of the lever that is located outside the contact position faces the powder box side. The driven piece is installed on the lever, and the lever is attached with a spring that biases the tip of the lever in the direction away from the periphery.The sealing plate is placed in the notch closed position when the mold is closed. As with location, characterized in that projecting from the drive piece for driving the driven member against the spring force.

[0006]

[Action]

 When the mold box is closed by bringing the seal plate of the powder box into contact with the horizontal periphery of the mold, the driving piece comes into contact with the driven piece to drive the lever, which rotates against the spring force. The closing block at the tip closes the notch. When the mold is opened after the molding process is completed, the seal plate separates from the mold and the driving piece releases the restraint of the driven piece. As a result, the lever rotates by the spring force to open the notch in the closing block, and the driven piece returns to the drive start position.

[0007]

【Example】

 1 to 3 show a schematic structure of a powder slush mold according to an embodiment of the present invention. In FIG. 3, a plate 21 around a mold assembly 2 is provided on one surface of a rotary frame 1 having a V-shape with a rotary shaft 1a on both sides and a plurality of toggle clamp tools (not shown) using cylinders. ) Is clamped from above, and the peripheral frame 55 of the powder box 5 is clamped to the other surface from below by a plurality of toggle clamps.

Inside the disassembleable mold assembly 2, as shown in FIG. 2, a cavity-shaped mold 22 is attached to a plate 21 having a notched central portion corresponding to its shape. The powder box 5 is provided with a storage section 51 for storing the powdery plastic material 51a at the bottom thereof, and a peripheral frame 55 at the upper part thereof is provided with a mesh 52 for dropping the powdery plastic material at the time of rotation, and around the mesh. Molding of the mold 22 A four-sided seal plate 53 is provided upright in the vertical direction toward a position corresponding to the terminal. As a result, when the rotary frame 1 is continuously rotated, the powdery plastic material 51a adheres to the heated mold 22 and melts, whereby the skin-like molded product 8 is formed.

Although such a configuration itself is well known, according to the present invention, a rectangular shape of a size that allows a finger to be inserted inside the horizontal peripheral portion 22a of the die 22 inward of the contact position of the seal plate 53. A notch 23 is formed, and a demolding tool 9 utilizing a lever 10 for the molded product 8 is provided outside the peripheral portion 22a.

That is, as shown in FIG. 1, when the intermediate portion of the lever 10 is pivotally supported by the pin 11a at the tip portion of the pole 11 projecting at a position closer to the outside than the abutting position described above. A closing block 12 for closing the notch 23 through an L-shaped hanging part 10a is provided at the tip of the lever, while the upper end of a rod-shaped driven piece 13 is pivotally connected to the rear end of the lever 10 with a pin 13a. I support you. Further, the lever 10 is equipped with a spring 15 for urging its tip in a direction away from the peripheral portion 22a. The sealing plate 53 is driven upward by restraining the rotation of the lower end of the driven piece 13 against the spring force so that the closing block 12 is positioned at the closing position in the mold closing state shown in the figure. A plate-shaped drive piece 17 is provided so as to project. The closing block 12 is formed in an arc shape centering on the pin 11a, exhibits mold releasability from the molded product 8, and is made of, for example, Teflon (trade name) having a higher thermal expansion coefficient than the die 22. Has been formed. The notch 23 is also formed in a corresponding shape. Such demolding tools 9 are provided on four sides of the rectangular peripheral portion 22a, but it is also possible to dispose a plurality of demolding tools 9 on each side depending on the shape of the mold.

In the molding process, the plate 21 of the mold assembly 2 is fixed to the rotary frame 1, and the powder box 5 filled with the powdery plastic material 51a and conveyed is also fixed from the opposite side. In this state, as shown in FIG. 2, the seal plate 53 abuts on the inner surface of the peripheral portion 22a of the mold 22, and at the same time, the driving piece 17 drives the driven piece 13 upward to see the lever 10 in the figure. And the counterclockwise rotation is performed to close the notch 23 in the closing block 12. In the heated state of the mold 22, the rotation of the rotating frame 1 causes the powdery plastic material 51a to pass through the mesh 52 and adhere to the mold 22 to be melted, so that the molded product 8 having a desired thickness is applied to its end. It is formed by being regulated by the seal plate 53.

At this time, the notch 23 is reliably sealed by the thermal expansion of the closing block 12 and the leakage of the powdery plastic material is prevented. When the powder box 5 is removed and the mold 22 is water-cooled after the molding process is completed, the closing block 12 contracts to the normal shape, and the driving piece 17 releases the restraint of the driven piece 13, so that the lever 10 moves by the spring 15. As shown in the drawing, the notch 23 is opened by rotating clockwise to the position indicated by the chain double-dashed line, and by rotating the closing block 12 in conjunction therewith. As a result, the mold assembly 2 is moved to the demolding place, and the end portion of the molded product 8 which is partially exposed through the notch 23 is pushed by a finger or a stick to easily demold it.

FIG. 4 shows another embodiment of the demolding tool. The tip of the lever 30 pivotally supported by the pin 31 a of the pole 31 hinges the closing block 32 with the pin 32 a, and the rear end has The driven piece 33 is formed in an L shape. A tension spring 35 is attached to the lever 30. The seal plate 53 is provided with a drive piece 37 that slides the tip end of the driven piece 33 and drives it upward. The closing block 32 and the notch 24 are formed in a truncated cone shape, and the inclination angle thereof is formed to be wider than the circular arc when the closing block 32 rotates. As a result, the driving piece 37 drives the driven piece 33 at the two-dot chain line position, and the closing block 32 rotates from the two-dot chain line position to the closed state shown by the solid line of the notch 24.

[0014]

[Effect of device]

 As described above, according to the present invention, since the end portion of the molded product is automatically partially exposed to the outside of the mold when the mold is opened, the mold can be easily mechanically separated without using a mold release agent. It becomes moldable. Therefore, the raw material cost can be reduced, the mold release agent cleaning device can be eliminated, and the molding processing time can be shortened.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view of a main part of a powder slush mold with a demolding tool according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part of the apparatus in a mold closed state.

FIG. 3 is a schematic perspective view of the device.

FIG. 4 is a cross-sectional view of a demolding tool according to another embodiment.

[Explanation of symbols]

 1 Rotating Frame 5 Powder Box 8 Molded Product 10, 30 Lever 12, 32 Closing Block 13, 33 Driven Piece 17, 37 Drive Piece 22 Mold 22a Peripheral Area 23, 24 Cutout 53 Seal Plate

Claims (1)

[Scope of utility model registration request] 1. A powdery plastic material housed in a powder box is heated by rotating the mold in a mold closed state in which a seal plate of the powder box is brought into contact with a horizontal peripheral portion of the mold from an orthogonal direction. In a powder slush molding die adapted to be melted and adhered to a die, the intermediate portion of the lever is pivotally supported on the peripheral portion, and the inner peripheral portion of the peripheral portion is closer to the inner side than the contact position of the seal plate. A notch is formed, a closing block for closing the notch is provided at the tip of the lever, a driven piece is provided at the rear end of the lever toward the powder box side, and the tip of the lever is further provided. A spring for urging the seal block against the peripheral portion in the separating direction, and at the sealing plate, positions the closing block in the closed position of the notch in the mold closed state. As described above, the powder slush molding die is characterized in that the drive piece for driving the driven piece against the spring force is provided in a protruding manner.