JPH0451858Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a kneading device, and more specifically, to a two-roll mill for dispersing filler in a resin or the like.

[Conventional technology]

As shown in FIG. 4, the conventional two-roll mill 1 basically rotates two kneading rolls 2a and 2b, each of which rotates in parallel and adjacent to the other, and these rolls 2a and 2b. It consists of a drive device (not shown) and a charging section 3 into which materials to be kneaded are charged. When using this conventional two-roll mill to knead two or more types of resins, or when blending and mixing additives such as antioxidants, plasticizers, colorants, pigments, and fillers with resins, For example, the resin of the material to be kneaded is transferred from the charging section 3 to the fourth
Introduce it between two rotating rolls as shown in the figure,
Adhere to the outer peripheral surface of each roll. In this state, resin and additives are further added from the charging section 3 and blended into the adhered resin 10. Due to the rotational force of each roll,
This compound is drawn into the narrow space between the two rolls, and the compound, such as the resin, is kneaded more uniformly.

[Problem that the invention attempts to solve]

However, when a conventional two-roll mill is used to blend inorganic powder filler into a resin with poor adhesion and disperse the filler into the resin, the fourth
As shown in the figure, the filler falls between the rolls and cannot be sufficiently incorporated into the resin. Therefore, it takes a considerable amount of time to reach the desired amount of filler, and the filler falls between the rolls. When the filler falls, it scatters, making it difficult to obtain a kneaded product with an accurate filler composition.

This idea was developed based on the above-mentioned background, and its purpose is to be able to mix and knead fillers into materials to be kneaded such as resin in a short time. To provide two rolls that can accurately mix.

[Means for solving problems]

The above object is achieved by the two rolls of this invention. In other words, this two-roll mill is
Two kneading rolls whose rotating axes are parallel and adjacent to each other, a drive device that rotates these rolls, a charging section into which materials to be kneaded are charged, and a kneading roller that is attached to the outer periphery of the rolls. The invention is characterized in that it has a striking device that forms irregularities on the surface of the material to be treated.

[Effect]

This invention having the above-mentioned configuration operates as follows.

The two kneading rolls of this invention pull and roll the material to be kneaded between the rolls by rotation of the rolls, and knead each compounded component at this time. If the material to be kneaded is even slightly sticky, it will stick to the outer periphery of the roll. In this invention, since a dent device is provided to form irregularities on the surface of the kneaded material, the surface area of the kneaded material is increased, and additives such as fillers are attached to or incorporated into the recesses on the surface. Since this incorporated state is drawn between rolls and rolled, the filler and other compounds are kneaded without detachment or falling.

〔Example〕

This invention will be specifically explained by the following examples with reference to the drawings.

FIG. 1 is a schematic diagram showing an embodiment of a two-roll mill according to this invention. In this embodiment, two parallel and adjacent kneading rolls 2a and 2b that rotate as shown in the figure, and a drive device such as an electric motor (not shown) that rotates these rolls are provided.
, a charging section 3 into which the material to be kneaded is charged, and a surface 1 of the material to be kneaded attached to the outer periphery of one of the rolls.
It is equipped with a striking device 4 that forms unevenness on the surface of the paper. In this example, the dent device includes an unevenness forming part 6 having a large number of bank-like protrusions 5 on the roll side, and an arm 7 that hits the unevenness forming part 6 against the outer surface of the roll and separates it.
This impression device makes a reciprocating motion with respect to the roll surface as shown in the figure while the roll is rotating, and forms groove-shaped irregularities 8 on the surface of the material to be kneaded.

In this invention, the output of the impression device and the number of reciprocations per unit time are arbitrary, and can be appropriately selected depending on the type and application of the kneaded material.

Various materials can be used for kneading in this invention, and particularly preferred materials in this invention include polyethylene, polypropylene,
These include thermoplastic resins such as ethylene and ethyl acrylate copolymers, carbon black, and fillers such as various pigments and dyes.

FIG. 2 shows another embodiment of this invention. In this embodiment, two parallel and adjacent kneading rolls 2a and 2b that rotate as shown in the figure, a drive device such as an electric motor (not shown) that rotates these rolls, and materials to be kneaded are installed. It is equipped with a charging section 3 for loading the material, and a striking device 4 for forming irregularities on the surface of the material to be kneaded attached to the outer periphery of one of the rolls. In this example, the impression device includes an unevenness forming part 6 having a large number of cylindrical protrusions 5 on the roll side, and an arm 7 that hits the unevenness forming part 6 against the outer surface of the roll and separates it. This indentation device is used during the rotation of the roll.
As shown in the figure, it reciprocates against the roll surface to form hole-like irregularities 8 on the surface of the material to be kneaded.

FIG. 3 shows another embodiment of this invention. In this embodiment, two parallel and adjacent kneading rolls 2a and 2b that rotate as shown in the figure, a drive device such as an electric motor (not shown) that rotates these rolls, and materials to be kneaded are installed. It is equipped with a charging section 3 for loading the material, and a striking device 4 for forming irregularities on the surface of the material to be kneaded attached to the outer periphery of one of the rolls. In this example, the impression device is a gear-shaped roller 9 adjacent to the roll 2b, which forms tooth-shaped irregularities 8 in the kneaded material adhered to the outer peripheral surface of the roll 2b.

This invention is not limited to the above example, and various modifications are possible. For example, both rolls may each be provided with a striking device.

In a preferred embodiment of this invention, the impression device is removably attached and can be removed so as not to get in the way during full-scale kneading after blending.

Test example With this idea, we used two roll mills (manufactured by Yasuda Seiki) that can form groove-like irregularities on the resin attached to the outer periphery of the rolls.
A PTC composition was prepared.

Polymer (high-density polyethylene)...50Wt% (Toyo Soda, Nipolon Hard 5100) Conductive particles (carbon black)...48Wt% Phenolic antioxidant...2Wt% (Ciba Geigy, Irganox 1010) Knead this raw material In doing so, the resin was softened above its melting point, and groove-like irregularities were formed on the surface of the resin that adhered to the roll when the filler component was introduced. As a result, the time required to mix all the carbon black was 13 minutes and 30 seconds, and the amount of scattered carbon black was extremely small.

Comparative Test Example Kneading was carried out in the same manner as in the test example except that groove-like irregularities were not formed on the surface of the resin adhered to the roll. As a result, it took 20 minutes to mix all of the carbon black, and a relatively large amount of scattered carbon black was found.

[Effect of idea]

With this invention, the following effects can be obtained.

As demonstrated by the above examples, the time for blending into the materials to be kneaded can be shortened and manufacturing efficiency can be increased. In addition, the amount of filler taken into the resin etc. can be precisely matched with the input amount, so that a kneaded product with an accurate composition can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a perspective view schematically showing an example of a two-roll mill according to this invention, FIGS. 2 and 3 are perspective views schematically showing another example of a two-roll mill according to this invention, and FIG. FIG. 1 is a perspective view schematically showing an example of a conventional two-roll mill. 1...2 roll mill, 2...roll, 3...
Charging section, 4... Indentation device, 5... Protrusion, 6...
unevenness forming part, 7... arm, 8... unevenness, 9... gear-shaped roll.

Claims (1)

[Scope of utility model registration request] Two kneading rolls whose respective rotation axes are parallel and adjacent to each other, a drive device that rotates these rolls, and a charging section into which materials to be kneaded are charged;
A two-roll mill characterized in that it has a dent device that forms irregularities on the surface of the material to be kneaded attached to the outer periphery of the rolls.