JPH0596607A - Manufacture of non-rigid extrusion-molded article - Google Patents

Abstract

(57) [Summary] [Objective] To provide a method for producing a soft extruded product, which can efficiently perform an anil treatment in a short time even with a small-scale apparatus, and can greatly improve the productivity. .. [Composition] The internal temperature of the continuously molded product immediately after extrusion from the extruder is primarily cooled to about 100 ° C, and then 80 ° C to 90 ° C.
Anil treatment is performed at a temperature of ℃ or more without applying tension, and then secondary cooling is performed to obtain a product.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a soft extruded product, and more particularly to an anil treatment which is a post-process of the molded product.

[0002]

2. Description of the Related Art A soft extruded product represented by a body side molding of an automobile is extruded, taken out by a take-out machine, subjected to a primer treatment as desired, and then cut into a regular length to obtain a product. At that time, the tension applied to the product by the take-up machine causes the product to warp or distort after cooling. Then, the distortion causes the post-shrinkage of the product, resulting in poor alignment accuracy with the body surface of the automobile, and causes the product to come off due to warpage after assembly.

Therefore, in order to prevent the warpage and distortion, the product is usually subjected to a post-treatment called an anil treatment. A general post-process for applying an anil treatment is shown in FIG.

In the figure, reference numeral 40 is an extruder, 41 is a primary cooling section, 42 is a cutter, 43 is an anil section, and 44 is a secondary cooling section. The extruded product P is extruded from the extruder 40 in a continuous molding shape and then passed through a primary cooling unit 41 such as a cold water tank. Then, it is taken out while being cooled to about room temperature by a take-up machine (not shown). Next, as shown in the figure, after being cut into a regular size by a cutter 42, an anil treatment is performed in an anil portion 43 and then cooled again to obtain a product.

This anil treatment releases the distortion in the product,
In order to prevent warpage after cooling, the product is reheated to 80 to 90 ° C. As an apparatus for performing the anil treatment, an anil furnace that directly heats a plurality of products with hot air or the like, an anil tank that heats the products in hot water, and the like are used.

However, since the former anil furnace is a batch type, the number of steps is increased and the workability is poor, and the products may stick to each other, so that a satisfactory anil effect may not be obtained.

On the other hand, the latter method allows continuous treatment, but sometimes the product is entangled and scratched, the warp becomes large, and sometimes the product is cut off. In addition, the entire device is large-scale.

FIG. 5 is a graph showing the relationship between the time required for this conventional post-processing step and the product temperature. The product takes about 6 minutes for the take-up, primer treatment and cutting treatment in the primary cooling step. It is cooled down to about room temperature.
However, for the anil treatment, the product is heated to 80 ° C to 90 ° C.
As described above, the heating must be performed again, which not only takes time to perform the work but also requires troublesome work, which causes a problem in productivity. In addition, since an anil treatment is performed after cutting, warpage is likely to occur, and in addition, when materials having different thermal expansion coefficients such as metal foil are laminated, it is difficult to prevent warpage of the product.

[0009]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned problems, and it is possible to efficiently perform an anil treatment in a short time even with a small-scale apparatus, and to improve productivity. It is an object of the present invention to provide a method for producing a soft extruded product, which can significantly improve

[0010]

That is, the present invention is
Immediately after extrusion from the extruder, the internal temperature of the continuous molded product is set to about 10
The present invention relates to a method for producing a soft extruded product, which is characterized in that primary cooling is performed around 0 ° C., then an anil treatment is performed at a temperature of 80 to 90 ° C. or higher without applying tension, and then secondary cooling is performed to obtain a product. .

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a schematic side view showing an example of the manufacturing method of the present invention, FIG. 2 is an enlarged side view of the main part thereof, and FIG. 3 is a graph showing the relationship between the time required for the post-process and the product temperature by the manufacturing method of the present invention. is there.

As shown in FIG. 1, the method for manufacturing a soft extruded product according to the present invention relates to a post-process of the molded product. In the figure, reference numeral 10 is an extrusion molding machine, 11 is a primary cooling unit, 12 is a take-up machine. 13 is an anil tank, 14 is a secondary cooling unit, 16 is a cutter, and 20 is a slack control unit.

The soft extruded product P continuously extruded from the known extruding machine 10 is taken by the take-up machine 12, passed through the primary cooling section 11 as it is, and cooled.
The product take-off speed in this embodiment is set to 5 m / min. This primary cooling unit 11 is a water tank filled with cold water of 17 ° C to 18 ° C, and does not completely remove the internal temperature of the molded product P having a temperature of 170 ° C inside and outside immediately after extrusion,
In order to keep the temperature at about 100 ° C., it is preferable that the length thereof is formed as short as possible. In this embodiment, it is formed to have a length of 3.5 m, and the molded product P passes through the inside of the primary cooling unit 11 in about 40 seconds.

Next, if desired, the surface of the molded product P is subjected to a primer treatment and the like, and then continuously transferred to the anil tank 13 by the take-up machine 12. 85 in this anil tank 13
Molded product P as well as being filled with warm water of 90 ° C to 90 ° C
There is provided a roller conveyor 19 for carrying the.

The roller conveyor 19 is composed of a plurality of well-known roller members 19a arranged side by side, and can convey the molded product P without applying tension or distortion.

It is preferable that the anil tank 13 has such a length that the tension applied to the product by the take-up machine 12 can be completely removed while passing through the anil tank 13.
It can be appropriately set depending on the thickness of the product and the product temperature before the anil treatment. In this embodiment, the length is 5 m.

The molded product P is heated to 80 ° C. to 90 ° C. while passing through the anil bath 13 to remove the tension inside the product, and the buoyancy of water and the roller conveyor 19 affect the molded product P. The new tension is sent to the secondary cooling unit 14 while being minimized.

FIG. 3 shows the relationship between the time required for the post-process and the product temperature according to the manufacturing method of the present invention. The molded product P sent to the anil tank 13 has an internal temperature of 100.degree.
Since it is only cooled to a certain degree, the target anil temperature can be reached in about 1 minute, and the production cycle can be greatly shortened.

The molded product P passing through the anil tank 13 passes through the secondary cooling section 14. The secondary cooling unit 14 is the primary cooling unit 1.
Similarly to 1, the molded product P is cooled to 50 ° C. or lower in a water tank filled with cold water of 17 ° C. to 18 ° C. This secondary cooling unit 1
The length of 4 varies depending on the product temperature during the cutting process, and is formed to be approximately 3 m to 8 m. When the molded product P is required to have high dimensional stability, it is preferable that the secondary cooling portion 14 is formed long and the molded product is cooled to around room temperature to prevent distortion.

The molded product P is always taken in a state of slack so that no excessive tension is applied to the molded product P in the entire subsequent steps. This slack state is controlled by the slack control unit 20 provided between the secondary cooling unit 14 and the cutter 16.

As will be better understood from FIG. 2, the slack control unit 20 is composed of an upper limit sensor 21 and a lower limit sensor 22 and is connected to a speed adjusting unit 25 for adjusting the take-up speed of the take-up machine 12. . Known photoelectric sensors and the like are used for the upper limit sensor 21 and the lower limit sensor 22,
The position of the molded product P when it is inserted between the upper limit sensor 21 and the lower limit sensor 22 is measured. The change in the position of the molded product P is transmitted to the speed controller 25, and the molded product P
Is always maintained at a constant position, that is, the take-up speed of the take-up machine 12 is controlled so that the amount of slack is always substantially constant. This prevents new tension from being applied to the molded product P.

The sufficiently cooled molded product P is cut by the cutter 16
The product is cut into pieces and packed into boxes to make products.
Reference numeral 27 is a conveyor for conveyance.

[0023]

As shown and described above, according to the method for manufacturing a soft extruded product of the present invention, the heat of the product itself generated by the molding is utilized, so that the product is reheated for the anil treatment. Even if the scale of the device is small, the effect can be sufficiently enhanced. Further, since the anil treatment can be effectively performed in a short time, the manufacturing cycle of the product is significantly shortened and the manufacturing cost is shortened. In addition, since it is possible to perform continuous processing in-line without applying extra tension, it is possible to provide a product with high dimensional stability without causing warpage.

[Brief description of drawings]

FIG. 1 is a schematic side view showing an example of a manufacturing method of the present invention.

FIG. 2 is an enlarged side view of the main part.

FIG. 3 is a graph showing a relationship between a time required for a post-process and a product temperature according to the manufacturing method of the present invention.

FIG. 4 is a schematic cross-sectional view showing an example of a conventional manufacturing method.

FIG. 5 is a graph showing the relationship between the time required for the post-process and the product temperature according to the conventional manufacturing method.

[Explanation of symbols]

 10 Extrusion Molding Machine 11 Primary Cooling Section 12 Take-up Machine 13 Anil Tank 14 Secondary Cooling Tank 16 Cutter 19 Roller Conveyor 20 Slack Control Section P Molded Product

Claims (3)

[Claims] 1. A continuous molded product immediately after being extruded from an extruder is primarily cooled to an internal temperature of about 100 ° C. and then 80 to 9
A method for producing a soft extruded product, which comprises performing an anil treatment at a temperature of 0 ° C. or higher without applying tension, and then performing secondary cooling to obtain a product. 2. The method for producing a soft extruded molded article according to claim 1, wherein the continuously molded article is conveyed by an anodizing treatment in a hot water anil tank by a roller conveyor. 3. The method for producing a soft extruded product according to claim 1, wherein the annealed continuous product is taken up in a slackened state.