JPH02286210A - Method of supplying plastic material - Google Patents

Abstract

PURPOSE:To enable supply or small distribution to a container to be carried out by suspending and supporting a bag-shaped container within the wide-opened part in the upper part of a supplier, and moving a contained material into the supplier through its self-weight in releasing the closure of the container port. CONSTITUTION:A bag-shaped container 20 contained with a material 40 is suspended in putting the closed mouth part 21 down, and then the mouth part 21 of the container 20 is released from closure. As the material within the container 20 comes down through its self-weight, the mouth part 21 of the container is brought into press contact with the inner surface of the wide-opened part of the supplier in its end periphery in close contact therewith. Therefore, the material 40 within the container 20 may not overflow from the wide-opened part 11 of the supplier 10, and comes down and moves into the supplier 10. The material 40 coming down thereinto is supplied in a container such as a hopper 31 or the like by a supplying part 12 through a valve 13 from the wide-opened part 11. At this time, the lower end of the supplying part 12 is placed at a position lower than the mouth part of the hopper 31, so that the material 40 coming out of the supplying part 12 is heaped such that the hopper 31 is filled thereby.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for supplying powdered or granular plastic raw materials, and more particularly to a method for supplying these raw materials from a bag-like container to a receiver.

(Prior art) Most plastic raw materials such as vinyl chloride and polyethylene are powdered raw materials or granular raw materials obtained by pelletizing the powdered raw materials, and most of them are sent from raw material manufacturers to molding manufacturers in 25 kg packs. paper bag or 500~1
Supplied in bag-like containers packed with 1,000 kg. These raw materials are then supplied to a hopper or the like of various molding machines such as an extrusion molding machine, and are molded into a predetermined product.

By the way, when supplying raw materials to a hopper etc., if the raw materials are packed in paper bags, they are not very heavy and can be supplied manually, but when packed in bag-like containers containing a large amount of raw materials as mentioned above, manual labor is not enough. Possible, and pneumatic transport supply devices using pressurized air or vacuum suction are often used.

(Problem to be solved by the invention) However, such a supply method using pressurized air or vacuum suction requires a pressure pump or a vacuum pump, which tends to make the supply device large and expensive. It has the disadvantage of being bulky.

(Means for Solving the Problem) Therefore, the present invention aims to provide a method for supplying raw materials from such a heavy container using a simple device, and the gist thereof is to using a feeding device having an expanded portion at the top and a pipe-like feeding portion at the bottom;
While the lower supply end of the supply device is located in the receiver, the bag-like container is suspended and held so that the mouth of the container is located within the widened part of the upper part of the supply device, and the mouth of the container is closed. By unraveling, the raw material contained in the container is moved into the feeding device while the edge of the mouth portion is pressed against the inner surface of the widening portion of the feeding device due to the weight of the raw material contained in the container, and is supplied to the receiver through the feeding portion, and the lower end of the feeding device is moved. A method for supplying powdery or granular plastic raw materials, characterized in that the raw materials are supplied to a receiver while the discharge pressure of the raw materials is lower than the force required to move the deposited raw materials.

(Function) When the container mouth is unclosed, the mouth is pressed by the weight of the raw material so that the edge of the mouth comes into close contact with the inner surface of the widening part of the supply device, so that the raw material inside the container is pushed into the widening part by the weight of the raw material. The container is moved so that it falls into the supply device without overflowing.

The transferred raw material is then fed to a receiver through a pipe-like feed. At this time, if the receiver is empty, the lower end of the supply section is open, and the water will fall and flow into the receiver due to its own weight. The raw material that flows out is deposited in the receiver and its surface gradually rises. Then, when the surface reaches the lower end of the supply section, the raw material attempting to flow out from the supply section is blocked by the accumulated raw material, and the outflow is stopped.

This is because the outlet (area) of the supply section is small, and the distance from the lower end of the outlet to the surface of the raw material inside the container, in other words, the gravity of the raw material per unit area inside the container and supply device is small. When the outflow pressure is transmitted to the deposited raw materials, since the raw materials are in powder or granular form, the direction is distributed in random directions, and the frictional force between the raw materials is large, and the drag force combined with the gravity of the deposited raw materials This is because this overcomes the outflow pressure of the raw material. That is, this is because it is smaller than the force required to move the deposited raw material (so-called force to spread it). Therefore, the raw material flowing out and depositing stops flowing out at a position slightly covering the lower end of the supply.

(Example) The present invention will be explained below based on examples.

The figure is a partially cutaway elevational view showing a method of supplying powdered raw material to the popper of an extrusion molding machine.

The supply device 10 is a funnel-shaped device, and has an enlarged part 11 in the upper part for receiving the raw material, and a vibrator-shaped supply part 12 in the lower part for supplying the raw material. A valve 13 is provided in the middle of the vibrator-shaped supply section 12, and the supply path within the supply section 12 can be opened and closed. Note that it is desirable that the supply section (vibrator) below the valve 13 be bendable. This feeding device 10 is installed on a desired receiver, for example, a hopper 31 which is a raw material input port of an extrusion molding machine 30. At this time, the lower end of the supply section 12 is held within the hopper 31. The powder or granular raw material 40 contained in the container 20 is supplied by the supply device 10 in the following manner.

First, the bag-shaped container 2o containing the raw material 40 is suspended from a ceiling (not shown) or the like with its closed mouth 21 facing down. At this time, the mouth part 21 is connected to the supply device 10.
It is located in the enlarged part ll of. The relationship between the opening 21 of the container 20 and the widened part 11 of the supply device 10 is such that when the size of the container opening 21 is made smaller than that of the widened part 11 and the container opening 21 is unclosed, It is preferable that the edge of the mouth part hangs down in a cylindrical shape. In this state, the opening 21 of the container 200 is unclosed.

The state when the mouth portion 21 is open is shown by a dashed dotted line. Then, the raw material in the container 2o falls down due to its own weight, so that the edge of the mouth 21 of the container is pressed into close contact with the inner surface of the expanded portion 11 of the supply device. As a result, the raw material 40 in the container 2° flows down and moves into the supply device 1O without overflowing from the widened portion 11 of the supply device 10. The raw material 40 that has flowed down passes through the valve 13 from the widening part 11 and enters the supply part 1.
2 to a receiver such as a hopper 31. At this time, since the lower end of the supply section 12 is located below the mouth of the hopper 31, the raw material 40 discharged from the supply section 12 is transferred to the hopper 31.
1. When the upper surface rises and reaches the lower end of the supply section 12, the supply of the raw material 40 that is about to flow out from the supply device is automatically stopped due to drag caused by friction of the accumulated raw materials. Thereafter, as the surface of the raw material in the hopper 31 decreases as the raw material is consumed by the forming process 30, the surface of the raw material in the hopper 31 decreases, and the surface of the raw material is gradually supplied from the supply device IO in accordance with the decrease. Note that if it is desired to stop the supply of raw materials to the hopper 31 midway through, the valve 13 may be closed.

When the raw material 40 is made of powder, it is preferable to cover the opening of the receiver such as the hopper 31 with a lid such as a cover. Of course, if the opening of the receptor is small and there is no need for a cover, it can be omitted.

Below are the specifications of one embodiment.

Bag-shaped container (height = approx. 1.2m): ! Contains 500 kg of powdered vinyl chloride resin (raw material bulk density = approx. 0.7) Feeding device: Height (from upper end of expansion part to lower end of feeding part) Approximately 80 cm Diameter of feeding part Approximately 8 cm With this specification, When raw material was supplied to the receiver, the flow of raw material stopped at a position where the deposited raw material covered the lower end of the feed by several millimeters.

In the above, an example has been described in which the raw material 40 is directly supplied to the hopper 31 of the molding machine 30, but the present invention is not limited to this. For example, the raw material 40 in the container 20 may be subdivided into a plurality of receivers (not shown). It will be easily understood that the same method can be implemented in any case. At this time, the lower end of the feeder is positioned inside the mouth of the receiver, and after the supply is stopped, the valve 13 is closed and the receiver is moved and replaced. Preferably, overflowing the receptacle due to falling is prevented.

In the figure, reference numeral 14 denotes a support plate of the supply device 10, which is supported by a column (not shown) or the like.

(Effects) As described above, the present invention utilizes the discharge pressure due to the weight of the raw material and the drag force due to the frictional force of the accumulated raw material to supply or subdivide the raw material from a heavy container to a receiver such as a hopper. Because of this, it can be supplied or aliquoted using a simple device, which is economically advantageous. Moreover, the operation can be performed semi-automatically and has the advantage that there is no risk of raw materials overflowing.

[Brief explanation of the drawing]

The figure is a partially cutaway elevational view of the feeding device, showing the feeding method of the present invention. DESCRIPTION OF SYMBOLS 10... Supply device, 11. Picture part, 13... Valve, 20. Container mouth, 30Φ par (receptor), 40... Supply... Expansion part, 12... Container , 21 - Molding machine, 31... Hola/raw material

Claims (1)

[Claims] A method for supplying plastic raw materials from a bag-like container to a receiver, in which a funnel-shaped supply device having an enlarged portion at the top and a pipe-like supply section at the bottom is used, and the lower end of the supply device is The bag-shaped container is placed in the container, and the bag-shaped container is suspended and held so that the mouth of the container is located in the widened part of the upper part.By unclosing the container mouth, the container is opened by the weight of the raw material inside the container. The raw material in the container is moved into the widened part of the feeding device while pressing the mouth edge of the container against the inner surface of the widened part, and is supplied to the receiver through the feeding part. 1. A method for supplying granular or powdered materials, characterized by supplying raw materials to a receiver with a force smaller than that required for .