JPH0716421Y2 - Twin screw extruder for molding glass fiber - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is a glass fiber in which two screws mesh with each other and rotate in the same direction or in different directions in a barrel to extrude while kneading the resin and the like inside. The present invention relates to a twin-screw extruder for resin molding.

(Prior Art) As an extruder having a high kneading function, the above-described extruder, in particular, a rotary mesh type twin-screw extruder in which a screw rotates in the same direction has been widely put into practical use.

The screw and barrel of the extruder generally have the structure shown in FIG. 2, and the barrel 1 and the screw 2 can change the kneading state and other functions (deaeration, etc.) depending on the resin or the application. The segment method is adopted like
Both the barrel and screw have a structure that can be appropriately rearranged as needed.

As a technique for further improving the kneading function of such an extruder, as shown in FIGS. 3 and 4, a technique in which a barrel inner cross section perpendicular to the axial direction is polygonal (Japanese Patent Application Laid-Open No. 51-39763). No. 112803) is known.

(Problems to be Solved by the Invention) In a conventional co-rotating intermeshing twin-screw extruder, an additive is supplied to the plasticized resin from the outside 4 of the barrel, and then the additive is kneaded and dispersed in the resin. For this reason, a kneading section 3 as shown in FIG. 2 is provided, a long screw portion is provided after that, and a resin and an additive are allowed to pass through the screw portion and finally reach a molding die.

As described above, since it takes a long process to knead and disperse the additive in the resin by using the conventional rotary mesh type twin-screw extruder, the machine length is inevitably long. There wasn't.

The present invention has been made to solve the above-mentioned problems of the prior art. By increasing the kneading and dispersing action of a glass fiber-containing resin-molding twin-screw extruder, a high-quality product can be obtained and the machine can be used as much as possible. It is intended to be compact and save space.

(Means for Solving the Problem) For this reason, the present invention provides a rotary meshing mechanism in which two ordinary screws mesh with each other and rotate in the same direction or in different directions in the barrel to extrude while kneading the resin and the like inside. In the twin-screw extruder
A barrel having at least a part in the longitudinal direction perpendicular to the axial direction, each having a polygonal shape, and having two lumens whose side portions along the longitudinal direction communicate with each other, is provided immediately before the polygonal barrel part. In order to solve the problem, it consists of a feed hole for feeding the glass fiber additive into the barrel and a molding die installed immediately after the exit of the polygonal barrel and having a squeezing structure at the tip. Is the means of.

(Operation) In the polygonal barrel portion, a mechanical kneading action is applied between the screw and the barrel, so that the kneading dispersion is extremely high as compared with the barrel portion having a circular cross section. Therefore, according to the present invention, by adopting the above means, it is possible to sufficiently knead and disperse the additive of the glass fiber supplied into the resin only in the polygonal barrel portion, and it is possible to manufacture a molded product of high quality. To do.

(Embodiment) Hereinafter, the present invention will be described in detail based on an illustrated embodiment.

FIG. 1 shows the positional relationship between the barrel and the screw of the rotary mesh type twin-screw extruder which is the device of this embodiment.

In the figure, 11 is an ordinary ordinary barrel whose inner-lumen cross section perpendicular to the axial direction is a spectacle shape in which two circles partially communicate with each other, and 12 is continuously provided at the downstream end of the barrel in the resin flow direction. It is a polygonal barrel. The inside of the polygonal barrel 12 has a cross section perpendicular to the axial direction in which two polygons are connected at the side (see FIG. 4). The mold 13 is directly connected. The tip of the molding die 13 has a narrowed structure as shown in FIG.

Further, an additive supply hole 14 for supplying an additive of glass fiber into the barrel is provided in the barrel 11 which is continuously provided on the base end surface of the polygonal barrel 12 and has the inner cavity of the above-mentioned cross section.

In the barrel configured as described above, two screws that mesh with each other and rotate are inserted as usual. In this embodiment, the two screws are normal screws without any particular shape.

Next, its operation will be described. The molten resin moves while being kneaded in the barrel by two ordinary screws which mesh with each other and rotate in the same direction, and are extruded from the molding die 13 to form a molded product having a desired cross section. obtain. At this time, when glass fibers are dispersed and added into the resin, glass fibers are supplied into the barrel 11 through an additive supply hole 14 of the barrel 11 that is continuously provided immediately before the polygonal barrel 12 from a supply device (not shown). . Barrel 11
The glass fibers supplied therein move with the molten resin and immediately enter the polygonal barrel 12. Here, the glass fiber and the molten resin have a mechanical kneading action between the barrel and the screw in addition to the kneading action of the screw, so that the resin and the fiber are sufficiently kneaded and dispersed. Move in.

(Effect of the Invention) As described in detail above, according to the present invention, two ordinary screws mesh with each other and rotate in the same direction or different directions in the barrel, and have a polygonal shape provided at least in part in the longitudinal direction. A supply hole for supplying the glass fiber additive into the barrel was provided immediately before the barrel, and a molding die was installed immediately after the exit of the polygonal barrel, and the tip of the die had a squeezing structure. As a result, the resistance of the outlet flow path is generated to fill the resin in the screw barrel, and the kneading action of the polygonal barrel can be increased, thus eliminating the need for a special screw. In addition, the length between the additive supply port and the tip of the barrel can be shortened, the power consumption can be reduced and the heat generation temperature can be reduced, the kneading dispersion of the glass fiber additive can be improved, and the quality of the molded product can be improved. Can be increased. Further, since the two screws are ordinary screws, there are advantages that the machine can be downsized and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a plan sectional view showing a barrel and a screw structure of a co-rotating mesh type twin-screw extruder which is a typical embodiment of the present invention,
FIG. 2 is a plan sectional view showing a barrel and a screw structure of a conventional general same-direction rotary meshing twin-screw extruder, FIG. 3 is a side sectional view of a conventional polygonal barrel, and FIG. 4 is FIG. FIG. 7 is a sectional view taken along line AA of FIG. Description of main parts of the figure 11 …… Conventional barrel with a circular bore 12 …… Highly kneading polygonal barrel 13 …… Molding mold 14 …… Additive supply hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A 51-39763 (JP, A) JP-A 49-52261 (JP, A) JP-A 58-56818 (JP, A) JP-A 59- 184635 (JP, A) Actual development Sho 57-193519 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A rotary mesh type twin-screw extruder in which two ordinary screws mesh with each other and rotate in the same direction or in different directions in a barrel to extrude while kneading the resin and the like inside, in a longitudinal direction. A barrel having at least a part thereof having a polygonal shape in a cross section perpendicular to the axial direction, and having two lumens whose side portions along the longitudinal direction communicate with each other, and a glass fiber provided immediately before the polygonal barrel portion. 2 axis for resin molding containing glass fiber, comprising a supply hole for supplying the additive of 1) into the barrel, and a molding die installed immediately after the exit of the polygonal barrel and having a squeezing structure at the tip. Extruder.