JPS60250914A - Plastic molding machine - Google Patents

Abstract

PURPOSE:To manufacture a resin molded piece of good quality by forcing purified hot air into an transfer duct of pellet material to communicate a hopper dryer with a molding machine and restraining the dryness of the pellet material from lowering. CONSTITUTION:In a plastic molding machine which communicates the pellet outlet 9 of the hopper dryer A and the hopper 8 of the resin molding machine with the transfer duct 10 of pellets, the hot air exhausted from the hopper 8 is collected in the filter box 12 and purified. Then, the purified hot air is sent by the blower 13 under pressure into the hopper 8 through the air duct 16, the distributor 17, the transfer duct to restrain the dryness of the pellet material from lowering. Accordingly, the humidity of the pellet material running in the transfer duct and hopper is released from being absorbed to enable a high quality resin molded piece to be prepared.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application of the Invention) The present invention relates to a plastic molding apparatus capable of producing highly accurate and uniform plastic products.

(Background of the Invention) Most of the plastic raw materials used for molding plastic products are pellets, but if these pellets contain moisture or humidity, they will hydrolyze and cause the resin to deteriorate. deteriorates, and the strength and toughness of the molded product decreases. In addition, as the pellet material contains more water, the fluidity of the molten resin increases, resulting in overfilling and formation of flakes in the mold, which may affect the shape, precision, or surface gloss of the molded product. This pellet material must be thoroughly dried before use to avoid adverse effects on the environment.

Therefore, conventionally, a hopper dryer has been developed to sufficiently dry the pellet material to be fed into the molding machine. The material is then transported via a transfer pipe. However,
In this conventional mechanism, the path of the transfer pipe is relatively long, and the inside of the loader on the molding machine is at room temperature and pressure, so the pellet material once dried in the hopper dryer is There was a problem in that the dryness of the pellet material was reduced because it was cooled during transfer in the transfer pipe and in the loader at normal temperature and normal pressure. In other words, even if a hopper dryer with excellent drying ability was developed, the dryness of the pellet material decreases while being supplied from the hopper dryer to the molding machine, making it difficult to obtain resin molded products of good quality. There was a problem.

(Object of the Invention) The present invention has been made to solve such problems, and includes a transfer pipe that communicates a hopper dryer with a loader installed in a molding machine, and a dry air inside the loader. An object of the present invention is to provide a plastic molding device that can produce resin molded products of good quality by press-fitting pellets and suppressing a decrease in dryness of pellet materials in the transfer pipe and loader. It is something.

(Embodiments of the Invention) The present invention will be described in detail below based on embodiments shown in the drawings.

1 is a hopper dryer, B is a molding machine, and C is a suction loader. First, the structure of hopper dryer A will be described. This hopper dryer consists of a loader 2 that sequentially supplies pellet material in a raw material tank 1, and a loader 2 that sequentially supplies pellet material in a raw material tank 1.
A dryer main body 6 that sequentially supplies the pellet material inside the dryer main body 6, a heating tower 4 that heats and dries the air to be supplied into the dryer main body, and a heating tower 4 that heats and dries the air to be supplied into the dryer main body 6; Supply blower 5 and the loader 2
and a dehumidifier 6 that dehumidifies and dries the humid air generated within the dryer body 6 and sends it to the heating tower 4, and pellets supplied from the material tank 1 into the loader 2 and the dryer body 3. The material is stirred and dried by dry heated air heated in the heating tower 4.

The molding machine B has a molding machine main body 7 and a loader 8 installed above the molding machine main body 7, and a pellet transfer pipe is connected between the loader 8 and the pellet outlet 9 of the hopper main body 6. They are connected by 10.

Note that 11 is a level meter that displays the amount of pellet material in the loader 8.

The suction loader C includes an air filter box 12,
It has a blower 16 for pressurizing the air purified in the filter box into the pellet outlet 9 and the pellet transfer pipe 10. 14 is an operation panel for operating the hopper dryer, the molding machine B, and the suction loader 0; 15 is an air guide pipe that communicates the loader 8 and the filter box 12; and 16 is the pellet outlet 9 of the blower 16 and the dryer body 6. The air conduit is shown communicating with the air distributor 17 provided.

The above is the configuration of this embodiment.Next, its operation will be described.The loader 2 is operated to supply pellet material to the dryer body 3 in the material tank 1, and the heating tower 4 and blower 5 are operated. As a result, the dry heated air dehumidified by the dehumidifier 6 and heated by the heating tower 4 is supplied into the filter of the dryer body, and the pellet material in the dryer body is effectively dried. The pellet material thus dried within the dryer main body 6 reaches the pellet outlet port 9, and the pellet material that has reached the pellet outlet port 9 is fed under pressure through the air pipe 16 by the blower 16 of the suction loader C. The pellets are sequentially fed into the pellet transfer pipe 10 by pressurized air, and are then forced into the loader 8 of the molding machine B.

That is, the inside of this pellet transfer pipe 10 and loader 8 is as follows.
Because the pressurized air sent from the blower 16 acts and is maintained higher than the external pressure, this pellet transfer pipe 1
0 and the pellet material in the loader 8 will be maintained in the initial heated and dry state. Therefore, the pellet material being supplied into the upper loader 8 of the molding machine main body 7 will be transferred to the molding machine main body without any humidity. 7, the product stability is good and high-precision plastic molded products can be produced.

(Summary of the Invention) As described above, the present invention provides a means for connecting the pellet transfer pipe 1 between the hopper dryer, the resin molding machine B, the pellet outlet 9 of the hopper dryer, and the loader 8 of the molding machine B.
In the plastic molding apparatus connected at 0, there is a filter box 12 for collecting and cleaning the hot air discharged from the loader 8, and the hot air cleaned by this filter box is passed through the pellet transfer pipe 10. This is a plastic molding device equipped with a blower 16 for pressure feeding into a loader 8.

(Effect of the invention) .

Therefore, according to this plastic molding apparatus, the internal pressure of the pellet transfer pipe 10 and the loader 8, which communicate between the pellet material hopper dryer and the plastic molding machine, is maintained higher than the external pressure. 10 and the loader 8, moisture absorption due to cooling is completely eliminated, and the pellets supplied to the plastic molding machine are in a completely dry state, resulting in stable precision. This has the effect of producing high quality plastic molded products. In addition, the air to be pumped into the pellet transfer pipe 10 and the loader 8 is the high-temperature air inside the loader 8 that is recovered and reused.
The heated state of the air and pellet material in the pellet transfer pipe 10 and the loader 8 can be effectively maintained, and there is also an effect that there is no wastage of thermal energy, and economic efficiency is also improved.

[Brief explanation of the drawing]

The drawing is an explanatory view showing an embodiment of a plastic molding apparatus according to the present invention. M...Hopper dryer B...Molding machine C...
Suction loader 1... Raw material tank 2... Loader 6.
... Dryer main body 4 ... Heating tower 5 ... Prower 6 ... Dehumidifier 7 ... Molding machine main body 8 ... Loader 9 ... Pellet outlet 10 ... Pellet transfer pipe 11 °...Level meter 12...Filter box 13...Prower 14...Operation panel 15
．． 16... Air guide pipe 17... Air distributor amendment document November 12, 1980 Manabu Shiga, Commissioner of the Patent Office, 1981 Patent Application No. 108987 2, Title of invention Plastic molding device 3, Cases of persons making amendments. Relationship Special M1: Out 1. Sponsor 4, Agent 5, Date of amendment order voluntarily) Description 1, Name of the invention Plastic molding device 2, Claims Hopper dryer, resin molding machine B, and pellet of the above-mentioned hopper dryer A In a plastic molding apparatus in which an outlet port 9 and an indicator 8 of a molding machine B are connected by a pellet transfer pipe 10, a filter box 12 for collecting and cleaning hot air discharged from the hopper 8, and this filter box are provided. A plastic molding apparatus characterized in that it is provided with a blower 13 for force-feeding hot air cleaned by the pellets into the hopper 8 through the pellet transfer pipe 10. 3. Detailed Description of the Invention (Field of Application of the Invention) The present invention relates to a plastic molding apparatus capable of producing highly accurate and uniform plastic products. (Background of the invention) Most of the plastic raw materials used for molding plastic products are pellets I.
If f contains moisture or humidity, hydrolysis will occur,
The resin deteriorates and the strength and toughness of the molded product decrease. Additionally, as the pellet material contains more water, the fluidity of the molten resin increases, resulting in overfilling and
This pellet material needs to be sufficiently dried before use, since the formation of flakes and the like may adversely affect the shape, precision, or surface gloss of the molded product. Therefore, in the past, a hopper dryer was developed to sufficiently dry the pellet material to be sent to the molding machine, and the pellet material dried by this hopper dryer was transferred to a hopper installed integrally with the molding machine. The material is transported through a transfer pipe within the interior. However, in this conventional mechanism, the transfer pipe route is relatively long, and the inside of the hopper on the molding machine is not airtight, so the atmosphere is at room temperature and pressure. There is a problem in that once dried pellet material is cooled and absorbed moisture while moving through the transfer pipe and in the loader at normal temperature and pressure, reducing the degree of dryness of the pellet material. In other words, even if a hopper dryer with excellent drying ability is developed, the dryness of the pellet material decreases while being supplied from the hopper dryer to the molding machine, making it difficult to obtain resin molded products of good quality. There was a point. (Object of the Invention) The present invention has been made to solve such problems, and includes a hopper dryer and a hopper provided in a molding machine having an airtight structure, and a transfer pipe and a pipe communicating with the hopper. To provide a plastic molding device that can produce resin molded products of good quality by isolating the inside of the hopper from outside air and suppressing a decrease in the dryness of pellet material in the transfer pipe and loader. The purpose is to (Embodiments of the Invention) The present invention will be described in detail below based on embodiments shown in the drawings. 1 is a hopper dryer, B is a molding machine, and C is a molding machine loader drive section. First, the structure of the hopper dryer A will be described. This hopper dryer includes a hopper 2 that sequentially supplies pellet materials in a raw material tank 1, a dryer body 6 that sequentially supplies pellet materials in this hopper 2, and dehumidified high-pressure air to be supplied into this dryer body. a heating tower 4 that heats the air, a blower 5 that supplies and circulates air heated and dried in the heating tower 4 into the dryer main body 6, and a dehumidifier 6 that supplies high-pressure dehumidified air within the dryer main body 6. Hopper 2 from material tank 1
The pellet material supplied into the dryer main body 6 is agitated and dried by dehumidifying, drying and heated air heated in the heating tower 4. The molding machine B has a molding machine main body 7 and an airtight structure hopper 8 installed above the molding machine main body 7.
and the pellet outlet 9 of the dryer main body B are connected by a pellet transfer pipe 10. Note that 11 is a level meter that displays the amount of pellet material in the hopper 8. The molding machine loader drive unit C includes an air filter box 12 and the air purified in the filter box to the pellet transfer pipe 1 through the pellet outlet 9.
It has a blower 13 for pumping the pellets into the container. 14 is an operation panel for operating the hopper dryer A, the molding machine B, and the molding machine loader drive unit C; 15 is the hopper 8;
Reference numeral 16 indicates an air guide pipe communicating between the blower 16 and the air distributor 17 provided at the outlet 9 of the dryer main body 6. The above is the configuration of this practical example.Next, to describe its function, the pellet material is supplied into the dryer body 6 in the material tank 1 through the hopper 2, and the heating tower 4 and blower 5 are operated. As a result, dry and heated air that has been subjected to high-pressure dehumidification and drying by the dehumidifier 6 and heated by the heating tower 4 is supplied into the dryer body 6, and the pellet material within the dryer body is effectively dried. In this way, the pellet material dried within the dryer body 6 reaches the pellet outlet 9.
The pellets U that have arrived inside the molding machine Rogue drive unit C
The pellets are sequentially fed into the pellet transfer pipe 1D by pressurized air that is forced through the air supply pipe 16 by the blower 16 of the pellets 16, and are then forced into the hopper 8 of the molding machine B. That is, the inside of the pellet transfer pipe 10 and the hopper 8 is fed under pressure by air sent from the blower 16, but this transfer loop is isolated from the outside air and is connected to a dryer unit containing a column of high-pressure dehumidified dry air. Since it is in communication with the main body 6, the pellet material in the pellet transfer pipe 10 and the loader 8 is maintained in its initial heated and dry state because the pellet material in the pellet transfer pipe 10 and the loader 8 is transferred in an atmosphere of heated drying air. . Therefore, the pellets and materials supplied into the upper hopper 8 of the molding machine main body 7 are sequentially supplied into the molding machine main body 7 without any humidity, resulting in good product stability and high precision plastic molded products. It has the effect of producing (Summary of the Invention) As described above, the present invention provides a pellet transfer pipe that connects the hopper dryer A, the resin molding machine B, the pellet outlet 9 of the hopper dryer A, and the airtight structure hopper 8 of the molding machine B. In the plastic molding apparatus connected by 10, there is a filter box 12 for collecting and cleaning the hot air discharged from the hopper 8, and the hot air cleaned by the filter box is sent to the hopper 8 through the pellet transfer pipe 10. This is a plastic molding device equipped with a blower 16 for pressure feeding. (Effect of the invention) Therefore, according to this glass molding apparatus, the internal pressure of the pellet transfer pipe 10 and the airtight structure hopper 8 that communicate between the popper dryer for pellets H and the plastic molding machine is maintained higher than the external pressure. As a result, when the pellet material transferred through the pellet transfer pipe 10 and the hopper 8 is cooled, moisture absorption by outside air is completely eliminated, and the pellet material supplied to the plastic molding machine is in a completely dry state. As a result, it is possible to produce high-quality plastic molded products with high stability and precision. In addition, the air to be pumped into the pellet transfer pipe 10 and the hopper 8 is the high temperature air in the hopper 8 which is recovered and reused. The heating state can be effectively maintained, thermal energy is not wasted, and economical efficiency is also improved. Brief Explanation of Drawing 4 The drawing is an explanatory drawing showing an embodiment of the plastic molding apparatus according to the present invention. A... Hopper dryer B... Molding machine C...
Forming loader drive unit 1... Raw material tank 2... Hopper 6... Dryer main body 4... Heating tower 5...
Blower 6... Dehumidifier 7... Molding machine main body 8... Hopper 9... Pellet outlet 10... Pellet transfer pipe 11... Level meter 12... Filter box 13... Blower -14...Operation panel 1
5.16...Air guide pipe 17-...Air distributor

Claims (1)

[Claims] In a plastic molding apparatus in which a hopper dryer, a resin molding machine B, a pellet outlet 9 of the hopper dryer A and a loader 8 of the molding machine B are connected by a pellet transfer pipe 10, A filter box 12 for collecting and cleaning the hot air discharged from the pellets, and a blower 16 for pumping the hot air cleaned by the filter box into the loader 8 through the pellet transfer pipe 10. Plastic molding equipment featuring: