JPH0473691B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an extrusion molding method for edge covers of glass, flat plates, etc., ie, elongated articles having a U-shaped or C-shaped cross section.

(Prior art) When extruding a long object with a U-shaped or C-shaped cross section, it is extremely difficult to extrude the same shape, and with normal extrusion techniques, the opening direction of the U-shaped or C-shaped Extruded products with a curved shape are not suitable for uses such as edge covers.

Due to the above-mentioned circumstances, in order to obtain a long extrusion molded product with a U-shaped or C-shaped cross section, it is necessary to first extrude it into a rectangular or elliptical tubular shape, and then cut a part of the tubular shape in the length direction to obtain a U-shaped or C-shaped elongated product. The method was to obtain a long product of type or C shape. Therefore, a tool, a device, or a heat source is required for the cutting, which is difficult in terms of workability and economy, and other better methods have been sought.

(Problems to be Solved by the Invention) The present invention has been made in view of the above points, and an object of the present invention is to provide a method for easily extrusion molding a long article having a U-shaped or C-shaped cross section. shall be.

(Means for Solving the Problems) In order to achieve the above object, the present invention introduces the kneaded and extracted mixture into the mixture passage between the die and the nipple, and the guided mixture from the die land. It is characterized by making incisions in most of the thickness at two places on the circumference of the tube while passing through the front of the die, extruding it into a tubular shape, and tearing it at the part where the incisions were made after passing through a cooling water tank. be.

(Function) By configuring the present invention as described above,
Since the pipe is extruded into a tubular shape by making cuts in two places along the circumference of the pipe through most of its thickness, the extruded pipe does not curve, and after passing through the cooling water tank, that is, after the tubular molded product has solidified, the cuts are The object is obtained by tearing the object in both directions.

(Example) Next, an example of the present invention will be described with reference to the drawings.

The mixture 2 kneaded and extracted from the extruder 1 is led to a mixture passage 4 via a crosshead 3. An admixture channel 4 is formed between the nipple 5 and the die 7. Note that 6 is a dice holder. Mixture 2
passes through the mixture passage 4 between the die land 8 and the nipple land 9. At this time, the mixture 2 is incised by the incision ridges 10,
After exiting the die land 8 and being extruded into a tubular shape 11, the knife 13 is held in a knife holder 12.
The cut is made by leaving a very small part of the thickness.

After that, the cut extruded tube 14
passes through the cooling water tank 15 to solidify its shape.
The tubular molded body 16 whose shape has been solidified passes through a capstan 17 and a guide roller 18, and the part that will become a product goes straight as it is and is wound up by a winder 19, and the part that is torn and will not become a product is taken up by a winder 20. It is wound up.

In the above embodiment, the knife holder 12 is made up of a flagin 21 and a knife holder 12, and the flagin 21 is attached to the front surface of the die 7 with a bolt 22, and the protrusion length of the knife 13 can be adjusted with the bolt 23 of the knife holder 12. I have to.

In this embodiment, explanation has been given regarding extrusion molding of a long object having a U-shaped cross section, but long objects of other shapes, for example, a C-shaped cross section, can also be molded by the same method. Moreover, it goes without saying that if a cut is made in the central part of the tubular shape, both the left and right parts can be made into products.

(Effects) As explained above, according to the present invention, the cross section is U-shaped,
When extrusion molding C-shaped long products, the product can be molded without curving in the direction of the longitudinal opening, eliminating the need for special equipment and heat sources for tearing as in the past, greatly improving workability and economic efficiency. be able to.

[Brief explanation of the drawing]

Fig. 1 is an overall layout of extrusion molding for carrying out the present invention, Fig. 2 is a vertical sectional view of a die, nipple, die holder section, knife, and knife holder section for carrying out the present invention, and Fig. 3 is the same as above. It is a front view. The main symbols in the drawings are as follows. 1... Extruder, 2... Mixture, 3... Crosshead, 4... Mixture passage, 5... Nipple, 7...
... Dice, 8 ... Dice land, 9 ... Nipple land, 10 ... Cut ridge, 12 ... Knife holder, 13 ... Knife, 15 ... Cooling water tank, 1
7... Capstan, 18... Guide roller, 1
9...Rewinder, 21...Fragine.

Claims (1)

[Claims] 1. Guide the kneaded and extruded mixture to the mixture passage between the die and the nipple, and while the guided mixture passes from the die land to the front of the die, incisions are made at two places on the tube circumference through most of the thickness. A method for extrusion molding a long product with a U-shaped or C-shaped cross section, characterized in that the product is extruded into a tubular shape, passed through a cooling water tank, and then torn at the cut portion.