JPS6038256B2 - Extrusion molding equipment - Google Patents

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, when extruding a long film of a constant width (usually 0.02-1.0cm thick) using thermoplastic resin, and when extruding a long sheet of constant width using thermoplastic resin, (Normally, the thickness of the plate is between 0.8 and 3 mm).Special molding equipment with different structures is used for extrusion molding. This is because, in addition to the difference in the type of die used, the cooling process of the molded molten plate material is also significantly different.Here, the differences between the two cases will be specifically described.

First of all, the remote causes of the difference include [a] those directly related to the plate thickness, and {b) those indirectly affected by the plate thickness, and the difference in die model belongs to the previous item ta}, And the difference in the cooling process belongs to the latter term 'b}.

a Regarding the die model, in the case of film dies,
Because it is thin, it can be molded with precise 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 facing downward.
On the other hand, the sheet die has a configuration in which the discharge slit is opened horizontally in the front direction. b Regarding the cooling process: A long object such as a molten film or sheet comes into contact with the mirror-finished peripheral surface of the cooling roll and is heated and solidified, but during cooling, precipitates from the resin material are deposited on the surface of the cooling roll. Characteristic phenomena that are separated can be seen.

This is a phenomenon in which additives such as stabilizers and lubricants contained in the resin material and volatile components in the resin precipitate due to rapid cooling of the temperature. It is inevitable that the accumulated material will be confronted.

However, if this accumulation is left alone, the accumulation will increase and cause significant unevenness on the final molding surface, or uneven adhesion to the cooling roll due to the accumulation.
This has an adverse effect 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 post-process, and the cooling roll is cleaned in this process. Specifically, the solidified film is transferred to the cooling roll by a separating roll. After separating from
By pressing the solidified film against the cooling roll again with the transfer roll, the accumulated material is returned to the film and uniformly deposited on the cooling roll.

However, as the thickness of the board increases, the resin has a large amount of heat, so it is no longer cooled by 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 conventional film forming processing equipment, a separation roll and a transfer roll are formed, but pinch rolls are not attached. The processing device had a different structure in which a pinch roll was formed, but a separation roll and a transfer roll were not attached.

However, with such conventional extrusion molding equipment, just because the plate thickness of the molded product differs, double investment is required in terms of equipment and space, and as a result, there is a significant cost reduction in the molded product. 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.

FIG. 1 shows the configuration when a film die is attached to the molding apparatus of the embodiment, and FIG. 2 shows the configuration when a sheet die 2 is attached to the same apparatus. As shown in the figure, the apparatus of the embodiment is equipped with two types of dies 1 and 2, and can be easily changed to either configuration with a simple operation. We will describe the configuration of

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 trench 4 in the floor in front of the extruder 3, that is, on the right side of the drawing, and the same platform. It is formed by a sliding table 7 that slides in the front-rear direction on the upper plate 6 of 5, and a polishing mechanism 8 installed on the sliding table 7.

Therefore, the heating (approximately 20
0 to 22,000, 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, and the extrusion discharge slit la of the die 1 faces downward. It is open to □.

Next, in the rear half of the polishing mechanism 8, a cooling roll 10 and a pinter roll 11 are disposed which are vertically opposed to each other. The circumferential surface of each roll is finished with a mirror finish, and oil cooling means (not shown) allows the roll to be driven at a constant speed of 80 to 90 degrees.
Forced cooling to 000.

In this way, the peripheral surface of the rear end of the cooling roll is opposed directly below the discharge slit la of the die 1.

Further, the pinter 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 the illustrated position Q, (referred to as the first position)
and a second position Q2 which will be described later.

Next, in the upper front half of the polishing mechanism 8, a double-acting roll IJ4 that selectively performs a separating operation and a rolling operation is installed. The film F is separated from the circumferential surface of the cooling roll 10.

However, the double-acting roll 14 as a lever is bearinged on a moving shaft supported by a sliding bracket 15, and the Z-bracket 15 is moved to the illustrated position R (referred to as the first position) by driving the hydraulic cylinder 16 back and forth. , and a second position R2 to be described later. Note that this roll 14 is similar to the cooling roll 10.
As in case 2, it is cooled to 70 to 80q0.
In addition, a pair of guide rollers 17 and 18 are arranged at the front and rear of the upper stage of the polishing 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 roller 19 . The transfer roll 20 is a pressure roll having a rubber peripheral surface. That is, the swing lever 19 driven by a swing drive means (not shown) is at the illustrated position S, (referred to as a first position), and the roll 20 is It is formed so that it can be set in either one of a swiveling position: a pressing position in which the peripheral surface is pressed against the cooling roll 10, and a separating position corresponding to a second position S2 of the row 20, which will be described later.

Here, the operation of the molding device of the embodiment in which silk is attached as described above will be explained.

The molten film F' hanging down from the discharge slit la of the die 1 is melted in the rear and lower half of the circumference of the cooling roll 10, absorbing heat and solidifying, and then separated from the cooling roll 10, and further It is transported rearward by the double-acting roll 14 and passes through the fall pressure 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 surface of the film F 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 sheena 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 elevating table 5 is raised by the rising acid operation drive.

The gripping table 7 sliding on the 'b' cart 22 is moved to the front end of the upper plate 6 by forward operation driving.

Furthermore, based on both movements by {a} and (b} mentioned above, the first
The cooling roll river located at position P (indicated in Figure 1)
The bottom circumferential surface thereof is moved to a second position P2 where the bottom peripheral surface faces the front of the discharge slit 2a of the die 2.

{C} The pinch roll 11 moves from the first position Q to the cooling roll 1 and the second cooling roll at a predetermined interval corresponding to the molding thickness by the upward operation drive of the hydraulic cylinder 13. It rises to position Q2. -td- The double-acting roll 14 is moved from the first position R to the second position R2 supporting the cooling roll 10 by the backward operation drive of the hydraulic cylinder 16.

'e} The transfer roll 20 is rotated from the first position S to a second position separated from the cooling roll 10 by the upward subsequent movement of the swing lever 19.

After such bush movement, each roll 10, 11, 14
, 20 are arranged as shown in the figure, the sheet forming process is started. That is, the discharge slit 2 of the die 2
The molten sheet SH extruded forward from a is press-formed to a predetermined thickness in three stages as it passes through the indirect gap between the cooling roll 10 and the pinch roll 11, and then continues to touch the cooling roll 10. After being cooled, it is further polished and shaped as it passes through the circumferential gap between the cooling roll 10 and the double-acting roll 14. Through,
pulled forward.

Through such a forming operation, a sheet molded product similar to that produced by conventional processing equipment can be obtained, but during this operation,
Needless to say, the transfer roll 20 is not in operation.

In this way, 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 polishing mechanism constituting the apparatus includes a cooling roll, a pinch roll, a double-acting roll that also serves as a separation row and a guide Z roll, and a transfer roll. In addition to being equipped with rolls, the arrangement of each of these rolls was configured to correspond to the thickness of the long body to be formed, and to be moved to the required location by simple individual or linked switching operations. Therefore, it is possible to mold and process films or sheets with a single model without complicating the equipment configuration, and this has the economic effect of reducing the cost of resin film products and resin sheet products. There is.

[Brief explanation of drawings]

1 and 2 are schematic diagrams of an extruder molding apparatus showing an embodiment of the present invention, in which FIG. 1 shows the configuration during film molding processing, and FIG. 2 shows the configuration during sheet molding processing. FIG. F.・・・． ...Film, SH.・・・．・Sheet, P
,,Q,,S,,T. ...First position, P2, Q2,
R2, S2... Second position, 1, 2... Die for film and sheet, 3... Extruder, 9...
・・・Base, 10...Cooling roll, 11...
...Pinch roll, 14...Double acting roll,
20...Transfer roll. Figure 1 Figure 2

Claims (1)

[Claims] 1. In a molding device for extrusion molding a long body of constant width using a thermoplastic resin material, an extruder for extruding and delivering a heated and molten resin material, and a selectively attached to the delivery side mouthpiece of the extruder are used. A film die and a sheet die having mounting compatibility that can be mounted, a first position where the side peripheral surface of the roll faces below the discharge slit of the film die in the mounted state, and a first position in which the side peripheral surface of the roll faces below the discharge slit of the film die in the mounted state a cooling roll that can be moved between two positions, and a second position where the bottom peripheral surface of the roll faces in front of the discharge slit of the sheet die, and 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 surrounding the cooling roll from below, and selectively fixed to one of the above positions. The pinch roll can be moved between two positions with respect to the cooling roll, a first position spaced apart from the front and a second position adjacent to and circumferentially from the front, and which one of the above positions a double-acting roll that is selectively fixed to the cooling roll, a first position that presses against 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.