JP2586001B2 - T-die - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a T-die used for forming a resin into a film or a sheet.
Easy to change the width of the film or sheet to be formed
-For the die.

[0002]

2. Description of the Related Art When a resin or a resin is formed into a film or sheet, a T-die having a manifold, a land, and a lip, each of which extends in the same direction, is generally used. In the T-die, the molten resin is fed into the manifold, and once the molten resin is filled into the manifold by the land portion having the narrowed flow path, the molten resin in the manifold passes through the land portion. It is pushed out from the lip. In such a T-die, the molten resin is reliably filled in the entire region in the longitudinal direction of the manifold, and the molten resin is extruded from the lip portion over the entire region in the longitudinal direction. Therefore, in the T-die, the width of the film or sheet to be formed is determined by the longitudinal lengths of the manifold, land, and lip. For this reason, when changing the forming width of a film or a sheet, a method of changing to a T-die having a length of a manifold or the like corresponding to the forming width is usually adopted.

However, when the width of a film or the like to be formed is changed by exchanging the T-die in this way, it takes a long time to exchange the T-die, and the production efficiency is poor. There is. For this purpose, equipment capable of automatically changing the T-die has been developed. However, T-
Even when the die is automatically exchanged, there is a problem that it takes a long time from when the T-die is exchanged and molding is restarted to when the molding is stabilized to obtain a predetermined molded product. Molded products manufactured until the molding becomes stable cannot be supplied as a product, so if the cost of the resin raw material is high, the expensive resin raw material is wasted during that time, and the economic efficiency is impaired. There is also a problem that it is.

In order to solve such a problem, an inner deckle type T-die which can easily change the forming width of a film or the like without replacing the T-die itself has been developed.

[0005] The inner deckle type T-die is shown in FIG.
As shown in FIG. 7, inside the die body 80, a manifold 84, a land 85, and a lip 86, each of which extends long in the same direction, are formed so as to be continuous in that order. The cross-sectional shape of the manifold 84 and land 85 is
Is defined by the inner peripheral surface of In the manifold 84 and the land portion 85, a pair of inner deckles 90 (only one of which is shown in FIG. 3) having a cross-sectional shape similar to their respective cross-sections is slidably disposed. Each inner deckle 90 regulates the flow of the molten resin flowing from the adapter 82 into the manifold 84 and the molten resin flowing into the land 85 in the longitudinal direction. Therefore, by sliding each inner deckle 90, the forming width of the film or the like is changed. The molten resin whose flow in the longitudinal direction is regulated by each inner deckle 90 is pushed out from a lip portion 86 formed between a pair of lip portions 87 and 87 provided on the die body 80,
Formed into a film or sheet.

[0006]

In such an inner deckle type T-die, each inner deckle 90 is
In order to easily slide inside the manifold 84 and the land 85 defined by the die body 80, each inner deckle 90, the manifold 84 and the land
It is necessary to provide an appropriate gap between it and 85. For this reason, when the molten resin is filled in the manifold 84,
The resin may leak from the gap. When the molten resin leaks from the gap between the inner deckle 90 and the manifold 84, the leaked resin stays and deteriorates the resin, and the leaked resin hardens, thereby causing sliding failure of each inner deckle 90. For this reason, the inner deckle type T-die cannot be used to form a film or sheet, and the leakage resin does not pose a problem.
It can be used only for a part of laminate molding .

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to make it possible to reliably prevent resin from leaking from a peripheral portion of an inner deckle slidably disposed in a manifold. To provide a die.

[0008]

SUMMARY OF THE INVENTION A T-die of the present invention extends in one direction, and has a manifold filled with a molten resin, a T-die extending in the same direction as the manifold, and a molten resin in the manifold. And a lip which is extruded and has a cross-sectional shape similar to that of the manifold, is slidably disposed in the manifold, and regulates the flow of the molten resin filled in the manifold in the longitudinal direction of the manifold. A pair of inner deckles, a pressing block extending in the longitudinal direction of the manifold so as to define one side edge of the manifold, and a pressing block disposed so as to be able to approach and separate from each inner deckle; And a block moving means for moving the pressing block so as to be fitted to the inner block so that both can be brought into close contact with each other. By, the above objects can be achieved.

[0009]

In the T-die of the present invention, when changing the width of a molded product such as a film, the pressing block is moved by the block moving means so that an appropriate gap is formed between each inner deckle. Is done. Then, after each inner deckle is moved and positioned in the longitudinal direction of the manifold, the pressing block is brought into close contact with the inner deckle by block moving means. In such a state, the molten resin is fed into the manifold to form a film or the like.

[0010]

Embodiments of the present invention will be described below. As shown in FIG. 1, the T-die of the present invention is used for extruding a resin into a film or a sheet, and has a die body 10 in which a manifold 21 for material distribution is provided. The die body 10 is elongated in a direction corresponding to a width direction of a film or the like to be formed. An adapter 20 is connected to the center of the die body 10 in the longitudinal direction, and a molten resin is supplied to the adapter 20 from an extruder, a gear pump, or the like. The molten resin fed to the adapter 20 is
Is supplied to the manifold 21 through a resin passage 24 provided in the air conditioner. The manifold 21 is elongated in the longitudinal direction of the die body 10, and the resin material supplied to the resin passage 24 of the die body 10 flows in the manifold 21 to flow in the longitudinal direction of the die body 10. . Below the manifold 21, a land portion 22 for increasing the pressure of the molten resin flowing into the manifold 21 is provided continuously to the manifold 21. The land portion 22 also has a manifold 21
Similarly to the above, it is provided over the entire area of the die body 10 in the longitudinal direction. These manifold 21 and land 22
Will be described later.

In the manifold 21 and the land 22,
A pair of inner deckles 50 and 50 are provided.
Each of the inner deckles 50 is slidable in the longitudinal direction of the die body 10 in the manifold 21 and the land 22, respectively. The inner deckle 50 allows the resin die body in the manifold 21 and the land 22.
The flow in the longitudinal direction of 10 is regulated. The cross section of each inner deckle 50 matches the cross sectional shape of the manifold 21 and the land portion 22. One inner deckle 50 is attached to one end of a pair of rods 52 and 52 extending in the longitudinal direction of the die body 10, and each rod 52 moves in the manifold 21 in the longitudinal direction of the die body 10. Possible
It is supported by the die body 10. One moving block 54 is attached to the other end of each rod 52,
The moving block 54 is screwed to a pair of ball screws 53 and 53. Then, each ball screw 53 is connected to the die body 10
Are rotated by a drive motor 51 attached to the motor. The other inner deckle 50 is
It has the same configuration except that it is symmetrical to one inner deckle 50.

When each drive motor 51 is driven to rotate, a pair of ball screws 53 are rotated in the same direction, and the ball screws 53 are rotated.
Is moved in parallel along each ball screw 53. Thereby, the pair of rods 52 attached to the moving block 54 are moved in the respective axial directions, and the inner deckle 50 attached to the end of each rod 52 moves inside the manifold 21 in the longitudinal direction of the die body 10. Are translated along. Each inner deckle 50 is moved around the resin passage 24 so as to approach and separate from each other.

The die body 10 has a first mold 11 and a second mold 12, as shown in FIG. 2, which is a sectional view taken along the line AA in FIG. The above-described resin passage 24 is formed in the first mold 11, and the adapter 20 is attached to the resin passage 24. The first mold 11 is abutted against the second mold 12 by a flat surface, and a pressing block 30 forming the manifold 21 and the like is housed on a side of the second mold 12 on the first mold 11 side. The accommodated chamber 14 is provided over the entire area of the die body 10 in the longitudinal direction. The pressing block 30 housed in the housing chamber 14 is movable in a direction of coming into contact with and separating from the first mold 11. In a portion of the pressing block 30 facing the first mold 11, a concave portion forming a manifold 21 and a land portion 22 provided continuously to the manifold 21 is provided over the entire area in the longitudinal direction of the die body 10. ing. The manifold 21 has an elliptical cross section together with a concave portion formed at the outlet of the resin passage 24 of the first mold 11. The land portion 22 continuing to the manifold 21 is such that the molten resin flowing into the manifold 21 flows in the longitudinal direction of the die body 10 and reaches each inner deckle 50.
The channel is narrowed.

One end of a connecting rod 32 is attached to the pressing block 30. The connecting rod 32 is inserted through a sleeve 33 that penetrates the second mold 12, and the other end of the connecting rod 32 is coaxially connected to a piston rod 34 of a pneumatic cylinder 31. . Therefore, the piston rod 34 is moved in the axial direction by the pneumatic cylinder 31, and the pressing block 30 is moved into the first mold 11 in the accommodation chamber 14.
Is moved in the direction of coming and going. Then, the pressing block 30
When the inner deckle 50 is moved so as to approach the first mold 11, each inner deckle 50 is fitted into the recess of the pressing block 30, and the outer peripheral surface of each inner deckle 50 on the second mold 12 side is moved. The entirety of the pressing block 30 is closely attached to the inner peripheral surface of the concave portion in the longitudinal direction.

The lower part of the pressing block 30 in the first mold 11 is a thin portion 42, and a fine adjustment lip 43 is provided below the thin portion 42. The fine adjustment lip 43 is located below the pressing block 30. The fine adjustment lip 43
Is adjusted by the fine adjustment screw 44 attached to the first mold 11.
With the thin portion 42 as a fulcrum, it is moved toward and away from the second mold 12.
The fine adjustment lip 43 is moved by a small amount by a fine adjustment screw 44.

A movable lip 40 is arranged opposite to the fine adjustment lip 43. The movable lip 40 is connected to the second mold 12
Is attached to the lower end of the lip so as to be able to contact and separate from the fine adjustment lip 43. The entire movable lip 40 is brought into and out of contact with a fine adjustment lip 43 by an adjustment screw 41 attached to the second mold 12. The opposing surfaces of the fine adjustment lip 43 and the movable lip 40 are flat surfaces parallel to each other, and the lip portion 23 is formed by a gap between the flat surfaces. Therefore, the gap between the lip portions 23 is adjusted by adjusting the movable lip 40 with the adjusting screw.
Coarse adjustment is performed by moving the fine adjustment lip 43 toward and away from the movable lip 40 by operating the fine adjustment screw 41.

The operation of the T-die having such a configuration will be described. Each inner deckle 50 is positioned in advance so as to have a dimension corresponding to the width dimension of the film or sheet to be formed. In this case, each inner deckle 50
Before moving the first mold 11, the pneumatic cylinder 31 attached to the second mold 12 is driven to move the pressing block 30 away from the first mold 11. This allows the pressing block
30 is separated from each inner deckle 50. In such a state, each motor 51 is driven in order to move each inner deckle 50 in the longitudinal direction of the die body 10. When the respective inner deckles 50 are at appropriate positions spaced apart from each other by a width corresponding to the width of the film or sheet to be formed, the driving of the respective motors 51 is stopped. In this state, the pneumatic cylinder 31 is driven so that the pressing block 30 approaches the first mold 11. When the pneumatic cylinder 31 is driven until the piston rod 34 of the pneumatic cylinder 31 does not move, the pressing block 30
The inner peripheral surface of the concave portion comes into close contact with each inner deckle 50, and the inner deckle 50 is pressed by the first mold 11. As a result, the outer peripheral surface of each inner deckle 50 is brought into close contact with the first mold and the pressing block 30 over the entire area in the longitudinal direction except for the lower end.

Further, the adjusting screw 41 and the fine adjusting screw 44 are operated so that the gap between the lip portions 23 is in a state corresponding to the thickness of the film or sheet to be formed.

In this state, the molten resin is
Is supplied to the resin passage 24 via the Then, the molten resin flows into the manifold 21 through the resin passage 24. The resin that has flowed into the manifold 21 is forced into the die body by the land 22 having a narrow flow path.
Flowed in 10 longitudinal directions. Then, the flow of the resin in the longitudinal direction of the die body 10 is regulated by each inner deckle 50, and the manifold 21 is filled with the resin. At this time, since each inner deckle 50 is in close contact with the first mold 11 and the pressing block 30, the molten resin enters between each inner deckle 50 and the first mold 11 and the pressing block 30. There is no danger. And then,
When the resin flows into the manifold 21 from the resin passage 24, the resin in the manifold 21 flows out through the land portion 22 and the lip portion 23 to the outside. At this time, the molten resin is regulated by the gap between the lips 23, whereby a film or sheet having a predetermined thickness is formed.

When changing the forming width of the film or sheet, the inner deckle 50 is formed as described above.
What is necessary is just to change the position of.

In the above embodiment, the pneumatic cylinder 31 is used to move the pressing block 30, but instead of the pneumatic cylinder 31, a hydraulic cylinder, a hydraulic cylinder,
A motor or the like can also be used. Further, by providing a plurality of pneumatic cylinders 31, it is possible to ensure that each inner index 50 and the pressing block 30 are in close contact with each other regardless of the position of each inner index 50.

[0022]

As described above, in the T-die of the present invention, since the pressing block defining one side edge of the manifold is brought into contact with and separated from each inner deckle, the molded article is formed. When the width is changed, the movement of each inner deckle becomes easy, and when the molten resin is formed into a film or the like, the leakage of the molten resin from the peripheral edge of the inner deckle can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an example of a T-die of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a horizontal and vertical sectional view of a conventional T-die.

[Explanation of symbols]

 10 Die body 21 Manifold 22 Land part 23 Lip part 30 Press block 31 Pneumatic cylinder 50 Inner deckle

Claims (1)

(57) [Claims] 1. A manifold extending in one direction and filled with a molten resin, a lip extending in the same direction as the manifold and extruding the molten resin in the manifold, and a cross section similar to the manifold A pair of inner deckles that are slidably disposed in the manifold with a shape, and that regulate the flow of molten resin filled in the manifold in the longitudinal direction of the manifold; and one side edge of the manifold A pressing block that extends in the longitudinal direction of the manifold to define a portion, and is disposed so as to be able to contact and separate from each inner deckle; and that the pressing block is fitted to each inner deckle to bring them into close contact with each other. And a block moving means for moving the pressing block to obtain the T-die.