JPS63162216A - Contour extrusion resin molding and its production - Google Patents

Abstract

PURPOSE:To make it possible to give excellent weatherability and dimensional stability as well as tough rigidity, by specifying the thickness of a contour extrusion molding of a synthetic resin which is extremely softened at a temp. above the second order transition point. CONSTITUTION:A contour extrusion molding whose thickness is 0.5-3.0mm is prepared by using a synthetic resin which is extremely softened at a temp. above the second order transition point. Pellets or powder of the resin is melted and extruded from a contour extrusion mold 2 of a required shape. A sizing apparatus 3 is placed to be close to the contour extrusion mold 2, and a plurality of sizing zones 31... consisting of unit molds for sizing prepared in about the same shape as the mols 2 is set in a line in the extrusion direction and warm water or water at room temp. is circulated in each sizing zone 31... and the temperature is lowered stepwise. An extruded material extruded from the contour extrusion mold 2 is immediately introduced into this sizing apparatus 3 and sized while being slowly cooled. The extruded material taken out is immersed in a water bath 4 and thereby completely cooled to remove deformation of the extruded material, which is then received by means of a take-up machine 5. Then, marking and cutting 6 is carried out on it and it is piled up and stored on a standing vehicle 7.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of application in fIL industry) The present invention relates to polycarbonate resin, polyethylene resin
New profile extrusion molded products made of synthetic resins such as polypropylene resins, polystyrene resins, acrylic resins, and polyethylene terephthalate resins, which become extremely soft at temperatures above the secondary transition point and have a melt viscosity of 100,000 poise or less, and the like. Concerning effective manufacturing methods.

(Prior Art) Molded products made of the resin described above are excellent in weather resistance, shape retention, rigidity, etc., and are widely used as building boards and other building materials.

(Problems to be Solved by the Invention) However, at temperatures above the secondary transition point, the above synthetic resin becomes extremely soft and has a melt viscosity of 100,000 poise or less (for example, starch syrup-like); It has the property of rapidly curing when the AR is below. Therefore, when such a resin is extruded to obtain a thin-walled molded product, the desired shape cannot be maintained because the molten resin hangs down at the exit of the extrusion mold. Also, if you try to forcibly remove this in the horizontal direction, the resin is still soft and may end up stretching. Furthermore, when sizing is done by cooling and solidifying with water while taking the product, if the resin is cooled too much, it will solidify rapidly and it will not be possible to form it into a shape that matches the sizing mold. This causes the inconvenience that it sticks to the sizing mold and cannot be removed, making it extremely difficult to form a mold with a uniform shape. In particular, the above phenomenon is remarkable when the thickness of the molded product is thin or in irregularly molded products such as eaves gutters that have hollow ears on both sides. This does not apply to irregularly molded products, but various architectural boards made into flat plates after being extruded downward from an extrusion mold and then passed through polygingerol (including corrugated plates made by sizing the flat plates with rolls, etc.) and thick sheets. In reality, it was limited to pipes, etc. However, if these resins are applied to thin-walled, irregularly shaped extruded products such as eaves gutters and thin pipes, it will be possible to reduce manufacturing costs, and their properties will increase their suitability and expand the range of applications. It was clear that this would lead to the development of new technology, and its development was strongly desired.

As a result of extensive research in order to meet the above-mentioned needs, the present inventor has completed an effective method for extrusion molding using the above-mentioned resin, and hereby provides a molded resin molded product using the method, as well as a method for manufacturing the same. That is.

(Means for Solving the Problems) The structure of the present invention for achieving the above object will be explained based on the attached embodiment diagrams. Fig. 1 is a schematic process diagram showing an embodiment of the method of the present invention; FIG. 2 is an enlarged vertical cross-sectional view taken along the line ■--■ in FIG. 1, and FIG. 3 is a vertical cross-sectional view illustrating an example of an eaves gutter of a modified extrusion molded product obtained by the same method. That is, the specific invention of the present invention is a profile extrusion molded product 1 of a synthetic resin that becomes extremely soft at temperatures higher than the secondary transition point, and has a wall thickness of 0.5 to 3.5 mm.
The second invention resides in a profile extruded resin molded product characterized by zero pus, and a second invention is characterized in that the synthetic resin is extruded from a profile extrusion mold 2, and then the extruded material is subjected to a stepwise temperature gradient in the extrusion direction. Multiple sizing zones 31 arranged in a row
. . , and is slowly cooled and sized through a sizing device 3 disposed close to the extrusion mold 2, and then taken out.

In addition to the above-mentioned synthetic resins, examples of the synthetic resins used in the present invention include polybutylene terephthalate, nylon, polyphenylene sulfide, and alloys thereof. When the temperature rises above 150"C), the viscosity drops to 100,000 poise or less, causing it to become extremely soft and resemble starch syrup, and when the temperature falls, it rapidly solidifies.

The wall thickness of the molded product of the present invention is 0.5 to 3.0+ as described above.
It is essential that it be no+, but if it is less than 0.5 on, the shape retention of the molded product itself will not be maintained, and if it is more than 3°0m (for example, thick-walled pipe), the method of the present invention cannot be applied. Since it can be molded without any modification, it is outside the scope of the present invention.

Next, the molding method of the present invention will be described. First.

The resin pellets or powder are melted (mold temperature is approximately 230° C.) and extruded from a profile extrusion mold 2 having a desired shape. In this case, if short glass fibers, glass fiber powder, glass powder, carbon short fibers, carbon short fiber powder, etc. are kneaded in the resin, surface smoothness will be imparted to the extruded material, and the extrusion mold 2 and the following will be described later. It is preferably employed because it improves mold releasability from the sizing mold 32, and also allows a translucent molded product to be obtained without using other pigments. A sizing device W13 is placed close to the irregular extrusion mold 2.
A plurality of sizing zones 31... are arranged in a row in the extrusion direction, and each sizing zone 31...
Warm water to room temperature water is circulated through the chamber, and the temperature is set to drop stepwise in the extrusion direction. The extruded material extruded from the profile extrusion mold 2 is immediately introduced into this sizing device fi3, and is sized while being slowly cooled. A water tank 4 for cooling is arranged next to the sizing device 3, and the extruded material drawn out from the sizing device 3 is immersed in this water tank 4 to be completely cooled to eliminate deformation of the extruded material, and then taken out by a take-up machine 5. Further, stamping, cutting 6, etc. are performed, and the sheets are stacked and stored on a cart 7.

Note that the steps after the sizing device 3 are not limited to the above,
Appropriate modifications can be made depending on the type of molded product.

(Function) The irregularly shaped extrusion molded product 1 having the above structure has the characteristics of the resin constituting it that permeates thoroughly, is extremely tough and has excellent weather resistance and shape retention, and is suitable for irregularly shaped extruded molded products such as rain gutters. The suitability is increased, and the applications as resin molded products (especially various thin pipes) are expanded.

In addition, in the manufacturing method of the present invention, the extruded material extruded from the profile extrusion mold 2 is immediately introduced into the sizing device 3, and is passed through the sizing zone 31 having a plurality of temperature gradients.
Unit mold 3 for sizing is slowly cooled while passing through
2, and is uniformly sized to become a uniform irregularly shaped molded product, which is then continuously taken off. In this way, even if it is an irregularly molded product having ears on both sides, such as an eaves gutter, or a thin pipe, there is no concern that the above-mentioned problems will occur, and a molded product of the desired shape can be reliably manufactured.

(Example) EXAMPLES The present invention will be explained in further detail with reference to Examples below.

FIG. 1 shows an example of extrusion molding of eaves gutters using polycarbonate resin. In the same figure.

The polycarbonate resin pellets 11 filled in the hopper 21 are heated and melted in a cylinder 22 and extruded into a gutter-shaped irregular extrusion mold 2 attached to the tip of the cylinder 22. In this case, it is also possible to knead the above-mentioned short fibers or powder into the resin. Further, the cylinder 22 is made of the resin pellet 11.
... is kneaded and extruded without melting it, but there are three temperature zones along the extrusion direction (for example, 250℃, 26℃).
This can be done smoothly if the temperature is set to 0°C or 280°C.

The extruded material 12 extruded from the above-mentioned irregular extrusion mold 2 is immediately introduced into the sizing device 3 so that it does not sag there. The sizing device 3 consists of a sizing unit mold 32 divided into upper and lower halves. Furthermore, three sizing zones 31... are provided consecutively in the extrusion direction. The sizing zone 31... is 100 along the extrusion direction.
Temperature gradients are set in stages such as ~80"C150~30℃, 30~10℃, and this temperature setting is performed by circulating pipes 33 embedded in each unit mold 32 as shown in FIG.
・This is done by circulating hot water to room temperature water.

When the extruded material 12 passes through the sizing device 3 whose temperature is set in this way, each part of the extruded material 12 is shaped while being uniformly slowly cooled. That is, when the first sizing zone 31 is kept in the above temperature range, the introduced extruded material 1
2 is still soft and can be molded, and is not in an extremely softened state (like starch syrup), and is molded in close contact with the unit mold 32 while slowly cooling and moving to the second sizing zone 3 of the first stage.
1, it is shaped in close contact with the unit mold 32 and further slowly cooled, and finally, it is further slowly cooled in the third sizing zone 31 to lower the temperature to a level where it cannot be deformed, and then the sizing device 3 derived.

In particular, if the thickness of the extruded material 12 is 0.5 to 3.0 m, the first
If the temperature of the first sizing zone 31 is higher than the above range, the starch syrup-like extruded material 12 will stick to the unit mold 32 and will not move; It may solidify before coming into close contact with the mold 32 and may no longer have a fixed shape. This tendency becomes stronger as the wall thickness becomes thinner, and especially when the thickness is 1.5 m or less, it becomes necessary to control the temperature more severely. Also.

When molding the eaves gutter 1 as in this embodiment, the main body 10
However, according to the method of the present invention, such a phenomenon is unlikely to occur. After i, as described above, the finished product is cooled in the water tank 4, taken up by the take-up machine 5, cut 6, and sequentially stored in the trolley 7 as the eaves gutter 1 as a deformed molded product. Further, as mentioned above, if short fibers or powder are kneaded in the resin in advance, smooth sizing is ensured due to the lubricious effect thereof, and a molded product having a glossy appearance can be obtained.

The eaves gutter 1 thus obtained is strong and has excellent weather resistance and shape retention as described above, and is manufactured by an extremely simple method called extrusion, so it can be supplied at a low cost. .

In the above embodiment, the sizing zones 31 are closely connected, but the invention is not limited to this, and it is also possible to separate the sizing zones and provide an air-cooled portion. That is, each sizing zone is separated to provide two air-cooled sections, or the first and second sizing zones, or the second and third sizing zones are separated and one air-cooled section is provided. This allows for finer adjustment of the slow cooling rate and smoother collection. In addition, although the above-mentioned embodiment was taken as an example of manufacturing eaves gutters, it goes without saying that the present invention can also be applied to thin pipes and other construction materials.

(Effects of the Invention) As described above, the profile extrusion resin molded product of the present invention is made of the above-mentioned resin, and has excellent weather resistance and shape retention as well as strong rigidity due to the characteristics of the resin. and
This will increase the suitability of this type of molded product and greatly contribute to the expansion of other uses.

In addition, in extrusion molding the above-mentioned molded product, a sizing device is installed immediately after the irregular extrusion mold, and the sizing device has a plurality of sizing zones in which temperature gradients are set stepwise in the extrusion direction. Because the extruded material is placed in rows, the extruded material drawn out from the mold is slowly cooled as it passes through these sizing zones, and even if the wall thickness is thin, it is sized while maintaining a constant shape, resulting in a continuous uniform molded product. It is made by

As described above, the present invention solves the conventional problems at once, and its value is extremely large.

[Brief explanation of the drawing]

Fig. 1 is a schematic process diagram showing one embodiment of the method of the present invention;
The figure is an enlarged vertical cross-sectional view taken along the line ■--■ of FIG. 1, and FIG. 3 is a vertical cross-sectional view illustrating an example of an eaves gutter made of a modified extrusion molded product obtained by the same method. (Explanation of symbols) 1... Irregular extrusion resin molded product, 2... Irregular extrusion mold, 3... Sizing device, 31... Sizing zone. -And more-

Claims (1)

[Scope of Claims] 1. A profile extrusion molded product of a synthetic resin that becomes extremely soft at temperatures higher than the secondary transition point, the wall thickness of which is 0.5 to 3.
A uniquely shaped extruded resin molded product characterized by a diameter of 0mm. 2. The synthetic resin, which becomes extremely soft at temperatures higher than the secondary transition point, is extruded from a modified extrusion mold, and the extruded material is then passed through multiple sizing zones arranged in a row with a stepwise temperature gradient in the extrusion direction. A method for manufacturing a profiled extruded resin molded product, which is slowly cooled and sized by passing it through a sizing device that is disposed close to the extrusion mold, and then taken out.