JPS5855220A - Extrusion molding equipment - Google Patents

Abstract

PURPOSE:To provide a molding equipment which is capable of molding either film or sheet without complicating the construction by arranging rolls so as to move to any required place by a switching operation. CONSTITUTION:A polishing mechanism 8 is equipped with a cooling roll 10, a pinch roll 11, a double acting coil 14 adapted to selectively perform separation and rolling actions and a transfer roll 20 at the lower end of an oscillatory lever. In the molding of a film, film die 1 is mounted to clean the cooling roll 10 with the transfer action. In the molding of a sheet, sheet die 2 is mounted to perform a polishing with the cooling roll 10 and the double acting roll 14.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an extrusion molding apparatus for extrusion molding a long body of constant width using a thermoplastic resin material such as polyvinyl chloride or polyethylene.

Conventionally, a long film of constant width (
Normally, the board thickness is 0. ．． 02-1. Otm) and when extruding a long sheet of constant width (usually 0.8 to 3.0 inches thick) of the same material, each side is different. A special molding device is used for the structure, and it can be used for pages with different thicknesses.
This is because not only the type of die used is different, but also the cooling process of the molded molten plate material is significantly different.Here, we will specifically discuss the differences between the two cases.

First of all, the remote causes of the difference include (a) those directly related to the plate thickness, and Q)) those indirectly affected by the plate thickness, and the difference in die type belongs to the previous item (a). And the difference in the cooling process belongs to the latter section (b).

a) Regarding die type: In the case of film dies, since the thickness is thin, molding can be performed with precision in thickness at the exit of the die.

On the other hand, in the case of sheet dies, since the sheet is thick, it is necessary to extrude the molten sheet between a cooling roll and a pinch roll to prevent sheet thickness asymmetry due to drooping or the like.

For this reason, film dies have their extrusion discharge slits opened downward, while sheet dies have discharge slits opened horizontally forward.

(b) Regarding the cooling process A long body such as a molten film or sheet comes into contact with the circumferential surface of a cooling roll that has a competitive surface finish, absorbs heat, and solidifies. During the cooling process, precipitates from the resin material are cooled. A characteristic phenomenon of separation on the roll surface is observed.

This is a phenomenon in which additives such as stabilizers and lubricants contained in resin materials and volatile components in the resin precipitate due to rapid cooling. Adhesion of deposits is unavoidable.

However, if this accumulation is left alone, the accumulation will increase and cause significant unevenness on the molding surface of the long body, or uneven adhesion to the cooling roll due to the accumulation.
This has negative effects such as unevenness in the transparency of the long body, resulting in problems that reduce the marketability of the molded product.

For this reason, in the cooling process for film forming, a separate transfer process is provided as a subsequent process, and cooling roll gluing is performed in this process. Specifically, the solidified film is cooled by a separation roll. After being separated from the roll, the solidified film is again pressed against the cooling roll by the transfer roll, so that the accumulated material on the cooling roll is returned to the film and uniformly adhered thereto.

However, as the thickness of the board increases, the resin has a large amount of heat and cannot be cooled completely with the cooling roll.
During the transition from the cooling roll to the separation roll, sagging occurs and the product loses its marketability. For this reason, in the case of a thick sheet, a method is used in which the sheet is cooled by being placed on a roll.

In this way, in the configuration of the conventional processing device for film forming, a separation roll and a transfer roll are formed, but a vinyl roller is not attached, and in contrast to this,
In the configuration of a conventional sheet forming processing device, a pinch roll is formed, but a separate structure is employed in which a separation roll and a transfer roll are not attached.

However, with such conventional extrusion molding equipment, the difference in plate thickness of the molded products requires double investment in equipment and space, resulting in a significant cost reduction in the molded products. There was a problem that it became an obstacle.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to make it possible to mold both films and sheets without complicating the structure. The purpose of the present invention is to provide an extrusion molding device.

The present invention will be described below based on an illustrated embodiment.

Figure 1 shows the molding apparatus of the embodiment with a film die l.
FIG. 2 shows the configuration when the sheet die 2 is assembled to the same device. As shown in the figure, the device of the embodiment has two types. dice 1,2
is attached, so that it can be easily changed to any configuration with a simple operation. First, the configuration for film formation will be described.

The molding apparatus of the embodiment (Fig. 1) consists of a normal extruder 3 installed on the floor, a lifting platform 5 folded in a recess 4 in the floor in front of the extruder 3, that is, on the right side of the drawing, and a It is formed by a sliding table 7 that slides in the front-rear direction on the upper plate 6 of 5, and a boring mechanism 8 installed on the rotation 7.

Therefore, the heating (approximately 20
0 to 220°C, PVC) A film die 1 having a T-shaped planar shape and an L-shaped side surface is attached to the molten resin material delivery mouthpiece 9. )1m is open downward.

Next, a cooling roll 10 and a pinch roll 11 are disposed in the rear half of the polishing mechanism 8, and are vertically opposed to each other. The roll 10 is driven at a constant speed of 80 to 90 degrees by an oil cooling means (not shown) and has a mirror-finished peripheral surface.
Forced cooling to 0°C.

Thus, the cooling roll 10 has its rear end surface facing directly below the discharge sulin (la) of the die 1.

Further, the pinch roll 11 is supported by a moving shaft supported by a bracket 12, and the same shaft is connected to a hydraulic cylinder 1.
6 is moved up and down to either the illustrated position Q (referred to as the first position) or the second position R2, which will be described later.
It is configured to be selectively set.

Next, a double-acting roll 14 that selectively performs a separating operation and a rolling operation is disposed in the upper front half of the polishing mechanism 8, and in this case, the cooling roll 101 touches and solidifies. An operation is performed to separate the film F from the surface of the cooling roll 10.

However, the double-acting roll 14 as a lever is supported by a moving shaft supported by a sliding bracket 15.
5 is moved to the illustrated position R by driving the hydraulic cylinder 16 back and forth.
1 (referred to as a first position) and a second position R2, which will be described later.

In addition, this roll 14 is cooled to 70-80 degreeC similarly to the case of the cooling roll 10.

In addition, a pair of guide rollers 17 and 18 are disposed at the front and rear of the upper stage of the boring mechanism 8, and the base of a swing lever 19 is pivotally supported at the rear end of the upper stage.
A transfer roll 20 is pivotally attached to the lower end of the lever 19'.

This transfer roll 20 is a pressure roll having a rubber surface, that is, the swing lever 19 driven by a swing drive means (not shown) is in the shown position S (referred to as the first position), and the roll rotates 20 times. A pressing position where the surface is pressed onto the cooling roll 10, and a second position S2 of the roll 20, which will be described later.
It is formed so that it can be set at either one of the oscillating positions and the separated position corresponding to the position.

Here, the operation of the molding apparatus of the embodiment assembled as described above will be explained.

The molten film F hanging down from the discharge slit 1a of the die 1 touches the rear lower half of the circumferential surface of the cooling roll 10 to absorb heat and solidify, and then is separated from the cooling roll 10, and further It is transported rearward by the roll 14 and passes through the clamping peripheral surfaces of the cooling roll 10 and the transfer roll 20.

During this passage, the above-mentioned accumulated substances adhering to the circumferential surface of the cooling roll 10 are uniformly transferred to the two surfaces of the film by the pressing force, and the cooling roll 10 is cleaned by this transfer operation.

Finally, the formed film F that has passed through the two guide rollers 17 and 18 is pulled forward via a movable guide roller 21, but this guide roller 21 is moved upward integrally with the support mechanism except during the film forming operation. It is formed in such a way that it escapes.

Through such a forming operation, a film molded product with good marketability can be obtained, but during this operation, the pinch roll 1
Needless to say, 1 is in a non-operational state.

Next, the formation mode and operation of the molding apparatus (FIG. 2) of the embodiment in which the sheathing die 2 is assembled will be described.

In the case of sheet forming operation, the following operations are performed in advance.

(a) The upper plate 6 of the lifting platform 5 is raised by a rising operation drive.

(b) The sliding table 7 sliding on the trolley 22 is moved to the front end of the upper plate 6 by the forward operation drive.

Furthermore, based on the above-mentioned movements (a) and (b), the cooling roll 10 that was in the second position R2 (denoted in FIG. 1) has its bottom surface in front of the discharge slit 2a of the die 2 The camera moves to the second position R2 where it faces the camera.

(c) The pinch roll 11 is driven by the upward operation of the hydraulic cylinder 13 to move from the first position Q to the second position R2 where it is in contact with the cooling roll 10 at a predetermined circumferential interval corresponding to the molding thickness. Rise.

(d)? The hydraulic roll 14 is moved from the first position R1 to the second position R2 where it is in contact with the cooling roll 10 by rearward operation driving of the hydraulic cylinder 16.

(e) The transfer roll 2o is rotated from the first position s1 to a second position separated from the cooling roll 10 by the upward operation movement of the swing lever 19.

After such operation movement, each roll -10°11.1
4. With the arrangement of 20 in the state shown in the figure, the sheet molding process is started.

That is, the molten sheet SH extruded forward through the discharge slit 2a of the die 2 is heated to a predetermined thickness in three stages when passing through the contact point between the cooling roll 10 and the vinyl roll 11. The press is molded, and after being cooled by contact with the cooling roll 1o, it is further polished as it passes through the circumferential gap between the cooling roll 1o and the double-acting roll 14, and is placed in place of the guide roller 21. After passing through the external conveyance guide rollers 23, it is pulled out to the front.

Through such a forming operation, a sheet molded product similar to that produced by conventional processing equipment can be obtained, but during this operation,
It goes without saying that the transfer roll 2o is not in operation.
do not have.

In this manner, the molding apparatus of the embodiment can mold both films and sheets based on simple and easy switching operations.

As described above, according to the extrusion molding apparatus according to the present invention, the borising mechanism constituting the apparatus includes a double-acting roll that also serves as a cooling roll, a pinch roll, a separation roll, and a guide roll, and a transfer roll. In addition to being equipped with each roll, the configuration is such that the arrangement of each roll can be moved to the required location by simple individual or linked switching operations, depending on the thickness of the long body to be formed. This makes it possible to mold and process films or sheets with a single model without complicating the equipment configuration, which is an economical solution that can reduce the cost of resin film products and resin sheet products. There is an effect.

[Brief explanation of drawings]

1 and 2 are schematic diagrams of an extrusion molding apparatus showing an embodiment of the present invention, in which FIG. 1 shows the configuration during film molding, and FIG. 2 shows the configuration during sheet molding. It is a figure of each of a configuration aspect. F...Film, SR--C), P, + Q+
+ sI+T, ... 1st position, R2+ Q2 +
R2+ s2''' second position, 1.2... Each die for film and sheet, 3... Extruder, 9... Mouthpiece, 1o... Cooling roll, 11... Vinci roll,
14...double acting roll, 2°...-transfer roll. Patent applicant CI Kasei Co., Ltd. Agent Patent attorney Norimitsu Nishimura

Claims (1)

[Claims] In a molding device for extrusion molding a long body of constant width using a thermoplastic resin material, an extruder that extrudes and delivers the heated and molten resin material, and an extruder on the delivery side of the extruder are selectively installed. Possible installations are compatible film dies and single-sheet ties, the first position where the side circumferential surface of the roll faces below the discharge slit of the film die in the installed state, and and a second position in which the bottom layer of the roll faces in front of the discharge slit of the sheet die, and a cooling roll that is selectively fixed to one of the positions. , can be moved between two positions with respect to the cooling roll, a first position spaced apart from below and a second position adjacent to and circumferentially from below;
A pinch roll that is selectively fixed to one of the above locations, and a first position that is spaced apart from the front and a second position that is close to and circumferentially contact the intercooling/cooling roll. a double-acting roll that can be moved between the positions and selectively fixed to one of the above locations; a first position that is in pressure contact with the vicinity of the top of the cooling roll; and a second position that is spaced apart from the cooling roll.
An extrusion molding apparatus characterized by comprising a transfer roll that can be moved between two positions and is selectively fixed to one of the positions.