JPH045311Y2 - - Google Patents

Description

[Detailed description of the invention] Technical field of the invention This invention relates to water-permeable pine.
The present invention relates to a water-permeable mat that is particularly preferably used when separating water from pellets obtained from an underwater cut type pellet production device.

Technical background of the invention and its problems Thermoplastic plastic materials are generally molded into a desired shape by extrusion molding or injection molding. Prior to these moldings, thermoplastic materials are generally supplied in the form of spheres, cylinders, disks, dice, etc., and these are commonly called pellets. Such pellets have been produced by extruding thermoplastic material into strands using an extruder and shredding them, or by directly forming pellets using pellet manufacturing equipment.

There are two ways to extrude and shred thermoplastic plastic materials into strands using an extruder: one method is in air and the other method is underwater. The underwater cutting method allows for smaller equipment and is said to generate less noise. It has the advantage that it is suitable for shredding rubbery plastic materials such as urethane resins and the like.

However, after forming a thermoplastic material into pellets using the underwater cutting method, it is necessary to separate the pellets from water and dry the pellets.
Conventionally, separation of pellets and water has been carried out using centrifugal dehydrators, which are said to have excellent dewatering performance, but centrifugal dehydrators require a high-mass rotating body to rotate at high speed, so they require advanced production. It required skill and balance, a large amount of power was required to rotate the rotating body, and there were other problems, such as the need to be extremely careful when cleaning.

Therefore, it is required to dry pellets without using a centrifugal dehydrator. When drying pellets using a device other than a centrifugal dehydrator, it is necessary to achieve a considerable degree of separation between pellets and water using a simple device.

Purpose of the invention The present invention is an attempt to solve the problems associated with the prior art as described above. The purpose of the present invention is to provide a water-permeable mat that can be used when attempting to achieve this with a device that is simpler than a centrifugal dehydrator.

By using the water-permeable mat according to the present invention, it is possible to achieve a considerable degree of separation between pellets and water, and drying of pellets can be achieved with a simpler device than a centrifugal dehydrator.

Summary of the invention The water-permeable pine according to the invention covers a sheet-like water-absorbing material with a first screen of 10 to 20 meshes.
Furthermore, on at least one side of the screen, 30 to 50
It is characterized by the provision of a second mesh screen.

Embodiments of the invention The present invention will be described below with reference to embodiments shown in the drawings.

The water-permeable mat 1 according to the present invention includes a sheet-like water-permeable material 2 and 10 to 10 provided so as to cover the water-permeable material 2, as shown in the cross-sectional view.
It consists of a first screen 3 of 20 meshes and a second screen 4 of 30 to 50 meshes provided on at least one side of the first screen 3.

As the water-permeable material 2 used in the present invention, water-permeable materials are widely used, and spongy materials having continuous cells are particularly preferred. When using the water-permeable material 2, unlike the case of water-absorbing materials such as sponges, the water-absorbing capacity does not become saturated, and therefore water can be continuously separated from the pellets. .

The reason why the first screen 3 of 10 to 20 meshes is provided to cover the sheet-like water-permeable material 2 is as follows.
This is mainly to give shape to the water-permeable material 2 and make it easier to handle. This first screen 3
It is preferable that the first screen 3 is provided so as to cover both the front and back sides of the water-permeable material, but it is not necessarily necessary to cover both the front and back sides, and in some cases, it may be provided only on the front surface. It is sufficient to give the water-permeable material 2 a certain shape.

On at least one surface of this first screen 3,
A second screen 4 of 30 to 50 meshes is provided, and this second screen 4 plays the following roles. In other words, when a pellet with moisture attached to it due to surface tension rolls onto the water-permeable mat 1, the surface tension of the water attached to the pellet is broken by the action of the second screen. The pellets are no longer attached to the pellets and are separated from the pellets.

If the mesh number of the second screen 4 is less than 30, it is not preferable because the surface tension of the water adhering to the pellets cannot be sufficiently broken, and if the mesh number exceeds 50, the mechanical This is not preferable because the strength decreases.

The first screen 3 and the second screen 4 are
Preferably, the screen is made of metal, such as stainless steel or galvanized iron.

The water-permeable mat 1 according to the present invention is attached to an underwater cut type pellet manufacturing apparatus, and the function of this water-permeable mat 1 will be explained.

The pellets shredded by the underwater cut type pellet manufacturing device are first separated from the circulating water by an inclined screen attached to the side of the device. Next, the pellets roll onto the water-permeable mat 1 attached to the pellet production equipment at almost the same slope as this inclined screen, but on this water-permeable mat 1, as mentioned above, the pellets adhere to the pellets due to surface tension. The water contained in the pellets is destroyed by the second screen 4 and separated from the pellets. This separated water reaches the sheet-shaped water-permeable material 2 provided at the bottom of the second screen 4, is guided to the lower surface of this water-permeable material 2, and is continuously discharged to the outside. At this time, the water-permeable material 2 does not exhibit a saturation phenomenon of water-absorbing capacity, which is observed in the case of water-absorbing materials such as sponges.

In this way separation of pellets and water is achieved to a considerable extent, so that drying of the pellets can be easily accomplished by equipment other than expensive equipment such as centrifugal dehydrators, such as blow dryers.

Effects of the invention In the water-permeable mat according to the invention, since the sheet-like water-permeable material is covered with the first and second screens of a specific mesh, pellets with moisture attached to the surface obtained from the underwater cut pellet manufacturing device are It becomes possible to efficiently and continuously remove moisture from the water. Therefore, the pellets can be dried using a simpler device without using an expensive and delicate device such as a centrifugal dehydrator.

[Brief explanation of the drawing]

The figure is a sectional view of a water-permeable pine according to the present invention. 1...Water-permeable matte, 2...Water-permeable material, 3...
1st screen, 4...2nd screen.

Claims (1)

[Scope of utility model registration request] A sheet-like water-permeable material, a first screen of 10 to 20 meshes provided to cover the sheet-like water-permeable material, and a first screen of 30-50 meshes provided on at least one side of the first screen. Water permeable pine consisting of 2 screens.