JPS5829726B2 - Addition equipment for fluidity additives for synthetic resins - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for effectively adding fluid additives to a synthetic resin material using an extrusion molding machine or an injection molding machine.

As the uses of synthetic resin products have expanded and their production volumes have increased, the use of additives, particularly fluidity additives, added to synthetic resin materials has also become popular, and there are a wide variety of types.

It started with the addition of plasticizers to vinyl chloride resin,
Today, there is increasing interest in the properties of flow additives and the processing and operational advantages associated with their use.

Conventionally, the method of adding these fluidity additives to synthetic resin materials is to mix the synthetic resin and fluidity additives in a tumbler.
The methods used include premixing by blending or mechanically forced stirring using a Hensel type mixer, and supplying the mixture to an extrusion molding machine or an injection molding machine for molding.

However, with this method, the premix tends to become block-like due to the viscosity and stickiness of the fluid additive, and the supply into the cylinder from the molding machine supply port does not go smoothly, causing problems such as feed slip phenomenon. This has the drawback that the amount of fluidity additive added is limited.

Furthermore, when a colorant is added in combination with a fluidity additive, there is also the drawback that the premixer used, the molding machine supply port, etc. must be cleaned.

Therefore, various methods of adding fluid additives have been devised, such as a method in which fluid additives are introduced directly into the bottom of a material synthetic resin hopper placed above the molding machine supply port, stirred, and then supplied to the molding machine; Another method is to drill a general purpose addition port in a part of the cylinder of the molding machine (before adding fluidity), introduce the fluidity additive directly into the cylinder from this addition port, and mix it with the material synthetic resin within the cylinder. Are known.

However, in these cases as well, in the former case, it is unavoidable that some amount of material resin remains near the supply port at the bottom of the hopper.
Therefore, there are drawbacks such as the resin material forming blocks in this area, causing a feed slip phenomenon, and the inability to supply a constant amount into the cylinder.

Furthermore, in the latter case, that is, a method of providing an addition port exclusively for the fluid additive in a part of the molding machine cylinder, it is difficult to drill holes in the cylinder because it is made of a very hard metal such as nitriding steel. Furthermore, it is very difficult to clean this added addition port.

Therefore, the present invention eliminates the drawbacks of the prior art as described above, and provides a simple structure that allows a fluid additive to be effectively added to the cylinder of a ready-made molding machine without performing any processing such as drilling. It was made for the purpose of providing equipment.

That is, the present invention provides an extrusion molding machine or an injection molding machine having a cylinder for heating and melting a synthetic resin material and having a built-in screw, and a supply port provided in the cylinder for supplying the synthetic resin material into the cylinder. The device is applied to a plate-shaped lid part that covers a part of the supply port and is placed on the peripheral edge of the supply port; extending downward from the plate-shaped lid part;
A leg portion having an arcuate circumferential surface that contacts the inner periphery of the supply port and an arcuate cutout portion corresponding to the screw shape; and a leg portion that penetrates the plate-like lid portion and the leg portion so that the fluid additive flows down into the cylinder. This is an addition device for a fluid additive for synthetic resins, characterized in that it consists of a spacer having an addition port bored in the spacer.

To explain this invention in more detail with reference to embodiments shown in the drawings, FIGS. 1 to 3 show a state in which a supply port 2 provided in a cylinder 1 of a molding machine is partially covered with a spacer 10 according to the invention, which will be described later.

Since the synthetic resin hopper (indicated by the dotted line) is placed above the supply port, or the supply port is narrowed by the spacer 10, the bottom port of the hopper must naturally be narrower than the original size of the supply port. .

The synthetic resin material supplied from the hopper falls into the cylinder 1 and is heated and melted while moving in the direction of the arrow by the rotation of the screw 3.

In this invention, the fluidity additive to be added to the synthetic resin material is directly added and supplied into the cylinder from the part of the supply port 2 near the cylinder exit, that is, the addition port 15 bored in the spacer 10. It is.

In this way, the resin fed into the cylinder is immediately mixed with the fluidity additive, and further heated and melted to be uniformly mixed.

Next, the apparatus of the present invention will be explained with reference to FIGS. 4 to 7. This apparatus consists of a spacer 10 that covers a part of the supply port 2 opening into the cylinder 1.

The plate-like lid part 11 is placed on the peripheral edge opening 4 of the supply port and partially closes the supply port.

A leg portion 12 to be inserted into the supply port extends below the lid portion 11, and the leg portion has an arcuate circumferential surface 13 that contacts the inner periphery of the supply port. An arcuate notch 14 is provided corresponding to the shape of the screw so that the tip of the leg does not come into contact with the screw.

An addition port 15 is bored in the plate-shaped lid portion, and this addition port passes through the leg portion with an arcuate cutout portion 141, so that the flowable additive supplied from the addition port flows down into the cylinder. ing.

In the illustrated embodiment, a hollow protrusion 16 is placed over the dosing port to extend the dosing port upwardly 1 to facilitate connection with a flowable additive supply device (not shown). However, such a protrusion 16 may be provided as necessary.

The interval a (see Fig. 2) over which the supply port 2 is covered by the spacer 10 should be determined according to the original size of the supply port, so that the material synthetic resin can leave the hopper through the uncovered supply port. Select a range within which the material can fall smoothly into the cylinder.

Further, although the distance between the narrowed end of the supply port and the addition port varies depending on the original size of the supply port, it is preferable to make this distance as large as possible.

This is to avoid mixing with the additive near the supply port 2, where the supplied resin is relatively likely to stagnate.

As mentioned above, the arcuate notch 14 is provided to prevent the tip of the leg 12 from coming into contact with the screw, but the fluid additive supplied from the addition port also flows along the arcuate surface of the notch to the inner periphery of the cylinder. It also has the effect of being diffused over the entire surface and achieving uniform mixing.

In order to improve this effect, it is preferable to make the gap between the notch arc surface and the screw as narrow as possible.

When using a spacer having the above structure, as shown in FIGS. 1 to 3, the arcuate circumferential surface 13 of the spacer leg 12 is brought into contact with the circumferential surface of the supply port inner wall near the cylinder outlet, so that the leg 12 into the supply port and place the plate-like lid portion 11 on the supply port peripheral edge 4, the spacer can be removably fitted into the supply port without rattling.

The additive may be supplied from the fluid additive supply device to the addition port of the spacer fitted in this manner.

As is clear from the above description, according to the present invention, it is possible to supply a constant amount of resin to a molding machine without the need to limit the amount of fluidity additive added, and without causing blocking of the material resin or feed slip phenomenon. It is possible to effectively mix the resin and the fluidity additive while maintaining the flowability.

Furthermore, the fluidity additive can be easily added by simply fitting the spacer, which has a simple structure according to the present invention, into the supply port of a ready-made molding machine without performing any processing such as drilling a part of the molding machine cylinder. By using such a spacer, the material resin supply port is not contaminated, and cleaning can be performed very simply and easily.

The present invention will be further explained below with reference to Examples.

Example I 10 parts of liquid paraffin is added to 100 parts of ABS resin (TUFREX-210: trade name manufactured by Mitsubishi Monsanto Chemical Co., Ltd.) and extrusion molded using a 4Qmiφ extruder (manufactured by Tanabe Plastics Co., Ltd.). At this time, a spacer as shown (interval a: 15 mm, interval b: 10 mm) is fitted into a part of the supply port, resin is supplied from the supply port, and liquid paraffin is added from the spacer addition port at the above addition ratio. The mixture was supplied and extrusion molded under conventional conditions.

As a result, no operational problems such as feed slips occurred.

Note that the molding machine output was approximately 1.5 times higher than in the case of additives.

On the other hand, for comparison, the same ABS resin and liquid paraffin as above were used, and after tumble blending was carried out in a conventional manner at the same addition ratio, the blended material was molded under the same conditions using the same extrusion molding machine. It was blocked inside the cylinder and was not fed into the extruder cylinder at all.

Further, even if forced feeding was performed, feed slip occurred and the work was impossible.

Example 2 A fluid additive was prepared in advance by mixing 20 parts of an anthraquinone blue oil-soluble dye with 100 parts of liquid paraffin.

Extrusion molding was carried out using the same spacer plastic molding machine as used in Example 1 so that 4 parts of this additive was added to 100 parts of the same ABS resin used in Example 1.

As a result, there is no fouling of the supply port, no resin blocks or feed slips, and there is no change in work compared to when no additives are added, and the molding machine output is approximately 1.
It has doubled.

Cleaning the spacer after work was also extremely easy.

Example 3 High density polyethylene (Hizex 2200J:
5 parts of liquid polybutene was added to 100 parts (trade name, manufactured by Mitsui Petrochemical Co., Ltd.) of 150X200X using a 3.5oz in-line screw injection molding machine (manufactured by Kawaguchi Tekko Co., Ltd.).
2.3 When injection molding the opening angle plate, use spacers as shown (interval a: 20 questions, interval b: 15 mm)
was fitted into a part of the supply port, resin was supplied from the supply port, liquid polypdenum was supplied from the spacer addition port at the above addition ratio, and injection molding was carried out under conventional conditions.

As a result, effective molding was possible without any operational problems.

Among them, the fluidity of the resin was improved compared to the case where no additive was added, and the injection pressure was lowered by about 10% than the injection pressure used in the comparative example described later, which was an appropriate condition.

For comparison, we used the same high-density polyethylene and liquid polybutene as above and performed tumble blending using the same addition ratio in a conventional manner, and then injection molded the same using the same molding machine. No waste was fed into the cylinder of the molding machine.

Further, even if forced feeding was performed, feed slip occurred and a complete molded product could not be obtained, resulting in poor workability.

Example 4 80 parts of liquid polybutene, 10 parts of fatty acid monoglyceride, 5 parts of perylene red pigment, and 10 parts of chlorinated alkyl phosphate
A fluidity additive was prepared in advance by mixing 0 parts.

The same high-density polyethylene 100 used in Example 3 above
injection molding was carried out using the same spacer and molding machine as used in Example 3 so that the additive was added at a ratio of 7 parts to 1 part.

As a result, no operational problems occurred compared to the case where no additive was added, and the spacer could be cleaned extremely easily after the work was completed.

Example 5 A spacer (distance a: 5Qmi,
Spacer b: 40 mm) is fitted, and polyvinyl chloride resin (103EP: trade name manufactured by Nippon Zeon Co., Ltd.) is supplied from the supply port, and dioctyl adipate 100 is supplied from the spacer addition port.
A mixed additive of 30 parts of calcium stearate, 30 parts of zinc stearate was supplied at a ratio of 10 parts to 100 parts of resin, and the outer diameter was 50 mm and the inner diameter was 4 mm.
A tube of Q mm was extruded by a conventional method.

As a result, no operational or quality problems occurred compared to the case of using a blended compound of polyvinyl chloride resin.

Example 6 A spacer as shown in the figure (distance a: 50 mm, distance b: 4 Q mm) was fitted to a part of the supply port of a 100 oz in-line screw injection molding machine (manufactured by Mitsubishi Natco Corporation),
ABS resin (TUFREX-410: trade name manufactured by Mitsubishi Monsanto Chemical Co., Ltd.) is supplied from the supply port, and 60 parts of liquid paraffin, 2 parts of phthalocyanine blue, 50 parts of hydroxyalkylamine, and 4 parts of titanium oxide are supplied from the spacer addition port.
A 1.6 kg television housing was injection molded by a conventional method by supplying 8 parts of the mixed additive at a ratio of 7 parts to 100 parts of the resin.

As a result, no operational problems occurred compared to the case where no additives were added.

Furthermore, no quality problems occurred compared to the case of using color compounds.

[Brief explanation of the drawing]

1 to 3 are a surface diagram including a partial cross section, a plan view 1 and a front view, and a fourth
Figures 7 to 7 show front plan, side and perspective views of the device of the invention. 1... Molding machine cylinder, 2... Supply port, 3...
Screw, 4... Supply port periphery, 10... Spacer 11... Plate lid part, 12... Leg part, 13...
Arc-shaped circumferential surface, 14... arc-shaped notch, 15... addition port,
16...Hollow protrusion.

Claims (1)

[Claims] 1. A device that is applied to an extrusion molding machine or an injection molding machine, which has a cylinder with a built-in screw that heats and melts the synthetic resin material, and a supply port provided in the cylinder to supply the synthetic resin material into the cylinder. a plate-shaped lid part that covers a part of the supply port and is placed on the peripheral edge of the supply port; an arcuate peripheral surface that extends downward from the plate-shaped lid part and comes into contact with the inner periphery of the supply port; It consists of a spacer having a leg portion with a corresponding arcuate notch portion, and an addition port drilled through the plate-like lid portion and the leg portion so that the fluid additive flows down into the cylinder. A device for adding fluidity additives for synthetic resins, characterized by: