Method of manufacturing plastic moulded products and device therefor

专利摘要:
A process and an apparatus obtain plastic molded objects according to a technique which consists of introducing the plastic into a silicone elastomer mold, then inserting this mold into a high frequency device comprising a turntable "carrousel", a series of high frequency heating presses and a cooling device. The process is characterized by the introduction of plastic into one end of the mold in the form of liquid plastisol under low pressure, i.e., less than 1 Magapascal. The apparatus employs a carrousel, a mold having two male inserts and resting on the carrousel, vacuum-creating means and plastisol injection means.
公开号:SU1720483A3
申请号:SU874202641
申请日:1987-05-25
公开日:1992-03-15
发明作者:Гра Эли
申请人:Анвер (Фирма)；
IPC主号:

专利说明:

The invention relates to a pattern molding technique made of silicone plastics, as well as devices for pressure molding in press equipment with high-frequency heating.
The purpose of the invention is to improve the quality of the product and the efficiency of the process.
According to the proposed method, any plastics in paste-like form (plastisols) can be used, for example, plastics based on polyvinyl chloride or its copolymer, or two-component polyurethanes. It is also possible to transform the paste into a mechanical foam by whipping or other similar methods, to obtain a microporous molded element, and this foam may contain a foaming agent.
Figures 1 and 2 show a device for creating a vacuum in a mold, a slit, in the process of two consecutive
phases of his work; on fig.Z and 4 - the device with the injection into the mold, a cut, during two successive phases of its work.
To form the proposed technology, plastic material (polyvinyl chloride, etc.) is introduced in the form of a powder or a liquid paste into the hollow parts of a silicone mold, in which there is (or is not) a metal insert. With the help of molds and high-frequency heating equipment, molded articles made from polyvinyl chloride pastes can be directly obtained by pressing, injecting polyvinyl chloride paste into the mold under low pressure, which is less than 1 MPa, preferably 0.1-0.5 MPa.
According to the proposed method, a vacuum is created in the mold, which is 0.01-0.05 MPa,
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The device according to the invention comprises a rotary table or a carousel faceplate, on which the molds are installed, subjected to successive heating and cooling with a corresponding rotation of the faceplate. In one of the faceplate positions, one of the molds is filled with plastic, this mold, the end of which is directed outward of the faceplate (front end), is indicated by 1.
The cavity 2 of the mold comes in two identical nozzles located in the same horizontal plane, one of which (3) is under vacuum and is connected to the vacuum nozzle in the mold (Figures 1 and 2), and the other (4) (Fig 3 and 4) is intended for injection of plastic into the mold and in connection with a plastic injection nozzle under pressure. Inside the nozzles there are balls 5 and 6, which are pressed by compressed springs 7 and 8, respectively, to the hole on the side of the cylinder, and the nozzles are made in one piece with the molds.
The vacuum cylinder 9 has the ability to move in the direction of the longitudinal axis of the system due to the usual sliding connection 10, and the outer conical part 11 of this cylinder, facing the nozzle 3, can be pressed against it tightly. Inside the cylinder 9 there is a position cylinder 12. of double action, in which there is a piston 13, on either side of which air can be supplied through the inlet and outlet ports 14 and 15.
The piston 13 is connected to the rod 16, which extends in the direction of the nozzle 3, the end 17 of the rod has a diameter that allows the rod to pass through the hole in the nozzle. In addition, there is a channel 18 for creating a vacuum, and this channel is not connected to the position cylinder 12 and intersects the wall of the cylinder 9 at the location of the end 17 of the stem. Channel 18 is connected to a vacuum device.
The injection nozzle 4 (FIGS. 3 and 4) can be inserted (arrow FI) into the enclosing end of cylinder 19, which is almost the same as cylinder 9 used to create a vacuum. FIGS. 3 and 4 are marked with a sliding joint 20, channels 21 and 22 of position cylinder 19, piston 23 with rod 24. However, this rod ends with a sealing plug 25, which can tightly seal channel 26, which is similar to the location of channel 18 in a cylinder 9 but he
designed for injection of plastic under pressure.
The negative pressure system works as follows.
The cylinder 9 moves in the direction of the nozzle 3 (in the direction of the arrow FI) until the end of the nozzle enters tightly into the enclosing end 11 of the cylinder 9 (Fig. 1). Then compressed air flows through the channel.
14 of the position cylinder 9 (arrow F2, FIG. 2), the piston 13 is pushed towards the nozzle 3 (arrow Pz), the end 17 of the rod 16 passes into the nozzle 3, retracting the ball 5. in contact with the spring 7. Next, a vacuum is created in the cavity 2 of the mold through the channel 18 with a suction device, for example a vacuum pump (not shown), along the arrow of the RF Compressed air flows through the channel 15 of the position cylinder 9 (arrow FS at
Fig. 1), the piston 13 moves back to the initial position, and the sherik 5 is again adjacent to the forward opening of the nozzle 3, allowing it to hold the vacuum in the cavity 2.
The injection unit is put into operation immediately after the working cycle of the cylinder 9, which creates a vacuum, ends. After the supply of compressed air through the channel 21 of the position cylinder 19 (arrow F2), which pushes the piston 23 to
the nozzle 4 is closed by the channel 26 with a sealing plug 25 attached to the stem 24 (FIG. 3), and the cylinder 19 with its surrounding end 27 fits tightly against the internal nozzle 4 (arrow FI).
In the second phase (FIG. 4), the piston 23 shifts in the opposite direction by supplying compressed air through the channel 22 of the position cylinder 19 (arrow Pz), freeing the hole 26 and allowing the plastic to be injected under pressure (arrow Fe), the plastic pressing the ball 6 in the nozzle 4 and penetrates into the cavity 2 forms. At the end of the injection process, the device is in the position shown
in FIG. 3, due to the appropriate placement of the piston 23. Thus, the operation of the nozzles placed in cylinders 9 and 19 is completed. Then, the following shape is filled after a corresponding rotation of the face plate.

权利要求:
Claims (8)
[1]
Claim 1. A method of manufacturing plastic molded products containing metal inserts by injecting plastic into a mold of silicone elastomer, some of which are made of pure resin, while others have a metal filler or are made of this metal, and if necessary,
provide a metal insert, while there are a number of high-frequency devices mounted on the turntable for heating and cooling before removing the finished product from the mold, characterized in that, in order to improve the quality of products and the efficiency of the process, plastic is fed into the mold polyvinylchloride plastisol in the form of a pressure of less than 1 MPa. but not less than 0.1 MPa.
[2]
2. A method according to claim 1, characterized in that a negative pressure of 0.01-0.05 MPa is created in the mold.
[3]
3. The method according to claims 1 and 2, from l and h and y and y, so that the plastisol is made on the basis of polyvinyl chloride or two-component polyurethane and it has the form of a so-called mechanical foam,
[4]
4. A device for the manufacture of plastic molded products containing metal inserts, including a turntable, on which forms are installed, high-frequency devices, a cylinder for injection of plastic under pressure, characterized in that it is equipped with a cylinder to create a vacuum; the mold is equipped with two nozzles, one of which is installed between the cylinder for creating / dilution and the mold, and the other between the cylinder for injection of plastic and the press-mold, the nozzles being located on the sides the mold remote from the center of the table, and the device is provided with means for axial movement of the cylinder.
[5]
5. The device according to claim 4, characterized in that the nozzles are mounted protruding beyond the limits of the mold, with the ends of the nozzles removed from the mold, which are tapered, and inside the nozzles are balls that are spring-loaded to the outlet opening facing the cylinder , with the cylinder from the side of the nozzle has a notch in the shape of the ends of the nozzles.
[6]
6. A device according to claims 4 and 5, characterized in that a two-position pneumatic cylinder is located in the cylinder for creating a vacuum, the rod of which is made with a diameter smaller than the diameter of the nozzle outlet.
[7]
7. A device according to claims 4 and 5, characterized in that a two-position pneumatic cylinder is located in the cylinder for injection of plastic, the rod of which has a cylindrical plug on the side of the nozzle outlet.
[8]
8. A device according to claims 4 to 7, characterized in that a channel is made in the case for creating a vacuum, which connects the axial zone to the source of vacuum, and in the cylinder for injection of plastic there is a channel that connects the axis to the plastic feed device under pressure.
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同族专利:

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公开号 | 公开日

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DE3716675A1|1987-12-03|

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FR2598959A1|1987-11-27|

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FR2598959B1|1988-12-02|

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GB2190873A|1987-12-02|

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IT8720639D0|1987-05-22|

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CN1017787B|1992-08-12|

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CN87103842A|1987-12-09|

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US4800049A|1989-01-24|

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IT1205021B|1989-03-10|

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GB2190873B|1989-12-13|

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GB8710700D0|1987-06-10|

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JPS62280015A|1987-12-04|

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法律状态:

优先权:

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申请号 | 申请日 | 专利标题

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FR8607446A|FR2598959B1|1986-05-26|1986-05-26|LOW PRESSURE LIQUID PASTISOL INJECTION METHOD AND DEVICE|

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