JPS6039247Y2 - Temperature control device for resin foam production - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a temperature control device for producing resin foam.

Various methods are used to make resin foams, and among them, a method using an extruder is widely used.

According to that method, it can be carried out continuously,
This is because it is advantageous.

In the method using an extruder, thermoplastic resin is heated and melted in the extruder, a blowing agent is press-fitted into the extruder, and the resin and blowing agent are mixed uniformly under pressure. It is extruded as a shaped laminate.

The extruded laminate foams in the atmosphere and becomes a foam.

In the above-mentioned method, in order to pressurize the blowing agent into the resin and create a composition containing the blowing agent uniformly, the resin needs to be at a sufficiently high temperature and in a sufficiently molten state.

However, when a resin containing a foaming agent is extruded through a die, the resin must not be very hot; it must be softened enough to foam, but cool enough to hold its shape. Must be.

Therefore, in a foam manufacturing method using an extruder, it is necessary to cool the resin composition containing a foaming agent on the way to the die.

The above-mentioned cooling needs to be performed uniformly.

This is because a resin composition containing a foaming agent will not foam uniformly unless the temperature is uniform.

Therefore, various devices have been proposed for uniformly cooling this resin composition.

Most of them have a rotating body that can be heated and cooled inside a barrel that can be heated and cooled, and a large number of protrusions that stand up toward the inner surface of the barrel on the outer circumferential surface of the rotating body, so that the rotating body substantially rotates in the direction in which the protrusions extend. It has a structure in which a large number of protrusions are arranged alternately in a staggered manner in the axial direction of the body.

Japanese Patent Publication No. 48-544 uses a rectangular plate as the above-mentioned projection.

It is proposed that this be mounted tangentially on the outer peripheral surface of the rotating body.

This publication describes that the right-angled rectangular plate attached in the tangential direction is called a floating blade, and that a through hole may be provided in the floating blade.

Furthermore, Japanese Patent Publication No. 54-42026 proposes using a right-angled rectangular plate as a protrusion and standing it upright on the outer circumferential surface of a rotating body. It is recommended that the perforations in each plate be slanted alternately inwardly and outwardly.

Since all of the devices described in these publications originally use right-angled rectangular plates as protrusions, they provide a large resistance to the rotation of the rotating body, and therefore, although a large force is required for rotation, stirring is difficult. The drawback was that the effects were not very good.

In addition, although the resin is cooled on the surface of the rotating body in the method described there, there is a part where the resin accumulates behind the protrusions near the rotating body, so cooling is not uniform. I couldn't do it.

This invention was made in an attempt to improve these drawbacks.

The gist of this invention is that the protrusion is not originally constructed as a right-angled rectangular plate, but instead is constructed as a T-shaped body, and the tip of the protrusion is enlarged.

This prevents the T-shaped body from providing a large amount of resistance to rotation, and allows the horizontal bar located at the head of the T-shaped body to scrape off the resin adhering to the inner surface of the barrel. The main idea is to send the resin toward the legs of the T, and to flow the resin from the inside of the barrel toward the surface of the rotating body.

This flow is an inward diagonal flow that passes directly over the surface of the rotating body, and this flow uniformly mixes the entire resin.

This invention is a resin temperature regulating device in which a rotating body capable of heating and cooling is provided in a barrel capable of heating and cooling, and a large number of protrusions are provided on the outer peripheral surface of the rotating body that stand up toward the inner surface of the barrel. The protrusion is constructed as a T-shaped body, the horizontal bar located at the head of the T is placed close to the inner surface of the barrel, and the longitudinal direction of the horizontal bar is fixed substantially in the axial direction of the rotating body, facing the inner surface of the barrel. The upper end surface of the horizontal bar and the front face of the horizontal bar facing the rotation direction are both sloped backwards toward the rotation direction,
This invention relates to a temperature control device for manufacturing resin foam, characterized in that the front end of the horizontal bar is sharpened.

The temperature control device according to this invention will be explained as follows based on the drawings.

FIG. 1 is a partially cutaway sectional view of the temperature control device according to this invention.

FIG. 2 is an enlarged perspective view of the protrusion shown in FIG. 1.

FIG. 3 is an enlarged cross-sectional view of the protrusion shown in FIG. 2.

FIG. 4 is an enlarged sectional view of another protrusion used in the device of this invention.

In Fig. 1, 1 is a rotating body, 2 is a barrel, 3 is a protrusion,
4 is a resin inlet, 5 is a resin outlet, 6 is a pipe for feeding and discharging a medium inside the rotating body 1, and 7 is a cover for the barrel 2.

The rotating body 1 is heated or cooled by a medium, and the medium enters the rotating body 1 through the outside of the vibro, and is discharged outside the rotating body through the inside of the vibro.

The barrel 2 is also heated or cooled by a medium, which enters through an inlet 8 and exits through an outlet 9.

The rotating body 1 rotates in the direction of the arrow 10.

During this time, the resin enters the barrel 2 from the inlet 4 and is thoroughly mixed by the rotation of the rotating body 1 while traveling inside the barrel 2.

At the same time, the resin is cooled to a desired temperature by heating or cooling from the rotating body 1 or the barrel 2.

The resin temperature is efficiently uniformized by the projections 3 attached to the rotating body 1.

As shown in FIG. 1, the protrusions 3 are distributed over the entire surface of the rotating body 1 from the resin population 4 to the resin outlet 5.

Its position is appropriately selected, paying particular attention to the distribution in the axial direction of the rotor 1, so that the tip of the protrusion 3 thoroughly scrapes the inner surface of the barrel 2 as the rotor 1 rotates.

In the example shown in FIG. 1, annular rows of protrusions 3 that are evenly distributed in the circumferential direction of the rotating body 1 are arranged in an axially intertwined manner.

That is, between one ring row and the next ring row, the projections belonging to the latter ring row are as follows when viewed from the circumferential direction:
It is located between the protrusions belonging to the former ring row, and when viewed from the axial direction, the front end and the rear end are placed in such a relationship that they are exactly facing each other.

The protrusion 3 is a T-shaped body, as shown in FIG.

There, a crossbar 32 is supported by a single post 31, which is attached to the center of the crossbar 32.

The support column 31 is made of a column with a circular cross section, and its lower end is fixed to the surface of the rotating body 1.

A gap 33 is formed between the horizontal bar 32 and the surface of the rotating body 1.

Regarding the relationship between the length of the strut and the length of the horizontal bar, it is desirable that the length of the horizontal bar is at least twice the length of the strut and no more than five times the length of the strut.

In FIG. 3, it is assumed that the rotating body 1 is rotated in the direction of an arrow 10.

The upper surface 321 of the horizontal bar 32 is provided close to the inner surface of the barrel 2, and among these, the front end is particularly close to the barrel 2, and the rear end is a downward slope.

Further, a front surface 322 facing the rotational direction of the horizontal bar 32 intersects with the upper surface 321 at an acute angle, forming a downwardly sloping surface.

Further, the lower surface 323 of the horizontal bar 32 also has a downwardly sloping surface.

The lower surface 323 is a surface on the horizontal bar 32 facing the rotating body 1, but it may be an extension of the front surface 322 and may be the same surface as the front surface 322.

Even at the smallest height H of the gap 33, the height H of the rotating body 1
It occupies more than half of the width W of the resin passage between the resin passage and the barrel 2.

In FIG. 3, since the lower surface 323 of the horizontal bar forms a downward slope, the distance H between the rear end of the lower surface 323 and the surface of the rotating body 1 is the minimum height of the gap 33. , the distance H occupies more than half of the resin passage width W.

Describing this using the horizontal bar 32 as a reference, since the horizontal bar 32 is provided close to the inner surface of the barrel 2, the difference between the resin passage width W and the distance H is approximately the thickness T of the horizontal bar, and therefore, , the thickness T of the horizontal bar is less than half the width W of the resin passage.

Here, the resin passage width W is 20 to 10100.
Although it can be within the range of r, it is preferably within the range of 30 to 5-.

The length L of the horizontal bar 32 in the rotational direction is set to be at least one-third and at most twice the width W of the resin passage.

As shown in FIG. 3, when the downward facing surface of the horizontal bar is divided into a front surface 322 and a lower surface 323, the length L2 of the portion corresponding to the lower surface 323 and the length of the portion corresponding to the front surface 322 are It is preferable that the ratio of 1:2 to 2:1 be within the range of 1:2 to 2:1.

Although FIG. 3 shows the horizontal bar 32 having a rectangular cross section, the cross-sectional shape of the horizontal bar is not limited to this.

For example, the cross-sectional shape of the horizontal bar 32 may be a polygon of pentagon or more, or may be triangular as shown in FIG. 4.

In the projection 3 in FIG. 4, the front surface 322 and the bottom surface 323 in FIG.
It can also be seen that these together constitute the lower surface 324.

The relationship between the length and height T of the projection 3 and the width W of the resin passage is the same as in the case of FIG.

In addition, in FIG. 1, a cantilevered body is illustrated as the rotating body 1, but the rotating body 1 may be a roll.

When the rotating body 1 is made into a roll, the resin outlet 5 is connected to the barrel 2.
It is necessary to install it on the side of the

The device of this invention may be like this.

To use the device of this invention, the rotating body 1 is rotated in the direction of the arrow 10, and while a heating or cooling medium is introduced into the interior of the rotating body 1 and the outside of the barrel 2, heated blowing agent-containing heat is heated. Plastic resin is press-fitted from resin population 4.

Then, the resin passes between the rotating body 1 and the barrel 2, and is heated or cooled by the rotating body 1 and the barrel 2, and is kneaded by the rotating body 1, before being discharged from the resin outlet 5. The resin is discharged from the resin outlet 5 as uniformly heated or cooled resin.

At this time, in the device of this invention, the protrusion 3 is placed on the rotating body 1.
is attached.

Moreover, the protrusion 3 is composed of a T-shaped body, and the upper surface 321 of the horizontal bar therein is close to the inner surface of the barrel 2 and has a downwardly downward surface, so that it adheres to the inner surface of the barrel 2 and exchanges heat. Scrape off the resin thoroughly.

Further, since the horizontal bar 32 has both the front surface 322 and the lower surface 323 facing backward, the resin thus scraped off is pushed downward along the front surface 322 and the lower surface 323.

Since there is a gap 33 below the front surface 322 and the lower surface 323, the resin is guided to the front surface 322 and the lower surface 323 and is pushed toward the surface of the rotating body 1.

This flow of resin mixes well with the resin heated or cooled on the surface of the rotating body 1, making the whole uniform.

In addition, since the protrusion is made up of a T-shaped body and the support column is made up of a single cylinder, the protrusion itself does not provide any extra resistance to the rotation of the rotating body 1, and the protrusion can be attached to the outer peripheral surface of the rotating body. It is easy to install on top.

Furthermore, since there is no part where the resin accumulates behind the protrusion 3 due to the rotation of the rotating body 1, decomposition of the resin is prevented.

Thus, according to the device of this invention, a resin having a uniform temperature and composition can be easily obtained.

In this respect, the device of this invention has brought about remarkable effects.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway sectional view of the device according to this invention. 2 is an enlarged perspective view of the protruding portion of the device shown in FIG. 1; FIG. FIG. 3 is an enlarged cross-sectional view of the protrusion shown in FIG. 2. FIG. 4 is an enlarged sectional view of another protrusion used in the device of this invention. In the figure, 1 is a rotating body, 2 is a barrel, 3 is a protrusion, 4 is a resin inlet, 5 is a resin outlet, 6 is a medium feeding/discharging pipe, 7
is a cover, 8 is a medium inlet, and 9 is a medium outlet. Further, 31 is a column, 32 is a horizontal bar, 321 is an upper surface of the horizontal bar, 322 is a front surface of the horizontal bar, 23 is a lower surface of the horizontal bar, and 33 is a gap.

Claims (1)

[Scope of utility model registration request] In a resin temperature control device, a rotating body capable of heating and cooling is provided inside a barrel capable of heating and cooling, and a large number of protrusions are provided on the outer peripheral surface of the rotating body that stand up toward the inner surface of the barrel. The horizontal bar located at the head of the T is placed close to the inner surface of the barrel, the longitudinal direction of the horizontal bar is fixed substantially toward the axial direction of the rotating body, and the upper end surface of the horizontal bar facing the inner surface of the barrel is fixed. and the front face of the horizontal bar facing in the rotational direction, both of which are sloped slopes extending back toward the rotational direction, and the front end of the horizontal bar is sharpened.