JPH0732031Y2 - T-die - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a synthetic resin molding apparatus such as a T-die for extruding a molten synthetic resin into a sheet shape or a film shape.

(Prior Art and Its Problems) FIGS. 3 and 4 are cross-sectional views showing a conventional synthetic resin molding apparatus, and a molten synthetic resin extending in one direction inside a die body 1 connected to a molten resin pressure-feeding apparatus (not shown). Manifold 2
And a planar passage 3 extending downward from the manifold 2. A pair of lips 4, 5 are fixed and supported on the lower surface of the die body 1 by bolts 6 and differential bolts 7 in order to adjust the distance between the lip lands 8. Reference numeral 10 is a cooling roll provided below the die body 1, and 11 is a silicone rubber roll.

As shown in FIG. 4, a pair of forming plates (inner deckles) 12 are provided at both ends of the planar passage 3 so as to adjust the width of the film or sheet to be formed. An operating rod 13 made of an iron rod having a diameter of about 4 mm is connected to the outer surface of the rod 12, the operating rod 13 is extended to the outside of the die body 1, and the protruding end is operated to form the forming plate.
12 is moved left and right to adjust the width of the planar passage 3 through which the molten resin passes. The sealing rod (inner deckle bar) 14 of the lip land portion 8 is made of, for example, a piano wire, and moves left and right together with the forming plate 12 to seal the lip land portion 8.

In this apparatus, the molten resin flows around the forming plate 12 as shown by the thick arrow in FIG. 4, and the width of the flow is regulated. Operating rods 13, 13
It stays in the space between them, which oxidizes and burns. Since this portion is difficult to clean, the oxidized resin flows out from the portion when the forming plate 12 is operated and is mixed with the mainstream molten resin to be molded. Since the quality of the molded product containing the oxidized resin is poor, the yield is reduced.

Further, generally, there is only one supply pipe 15 which is connected to a molten resin pressure-feeding device (not shown) and pressure-feeds the molten resin. There is a problem that it is difficult to obtain uniformity.

An object of the present invention is to solve the above problems and to provide a T-die that does not stagnate and oxidize the molten resin and that has good uniformity.

(Means for Achieving the Object) The present invention has been made to achieve the above object,
In a T-die provided with a manifold extending in one direction at a tip side of a supply pipe 22 provided at a central portion of a die main body 21 for receiving a molten resin pressure-fed from a molten resin pressure-feeding device in a synthetic resin molding device, The manifold is provided in two stages in the direction perpendicular to the resin flow, and the first manifold 23, the first planar passage 24 continuously connected to the entire width of the lower side of the first manifold 23, A second manifold 25 provided below the first planar passage 24, a second planar passage 26 continuously connected to the entire lower width of the second manifold 25, and a second manifold 25 And a lip land portion 29 provided at the lower end of the planar passage 26 of the second manifold 25.
Seal plate at the end to avoid contact with its inner surface
A first seal rod 31 which slidably penetrates 30 and a forming plate 33 is provided in the second planar passage 26 at the tip thereof.
And a second seal rod 32 provided at the upper end of the lip land portion 29 by slidingly penetrating the seal plate 30 at a position where they respectively contact the lips 27, 28 on both sides and the lower end of the forming plate 33. A drive device for sliding the first seal rod 31 provided with the forming plate 33 and the second seal rod 32 in the direction parallel to the first manifold 23 and the lip land portion 29 by the same distance from the outside. Is provided.

(Operation) As described above, since the first seal rod 31 is inserted into both ends of the second manifold 25, it is difficult for molten resin to flow between the forming plate 33 and the seal plate 30, For this reason, the resin scorching phenomenon is unlikely to occur.

Further, since the manifolds are provided in two stages, by the time the molten resin flows into the second planar passage 26, it is completely kneaded and made uniform.

(Embodiment) FIG. 1 is a vertical sectional view of an end portion of a T-die of the present invention, and FIG. 2 is a sectional view taken along the line AA of FIG. The die body 21 has a molten resin supply pipe 22 formed in the center thereof, the molten resin supply pipe 22 being press-fitted by a molten resin pressure feeding device (not shown). A first manifold 23 is bored in the lower end of the supply pipe 22 in a continuous manner so as to fill the lateral width of the die body 21. A first planar passage 24 having a full width is provided continuously to the lower side of the first manifold 23. At the lower end of the first planar passage 24, a second manifold 25 having a cylindrical vertical cross section is bored over the entire width. A second planar passage 26 having a full width is formed continuously with the lower side of the second manifold 25. This second planar passage
Although the lower end of 26 is open as it is, a lip land that regulates the thickness of the sheet or film formed by the lips 27, 28 whose structure is adjusted and fixed on the inclined front and rear side surfaces of the die body 21. The part 29 is formed.

Both side surfaces of the die main body 21 are closed by seal plates 30 and 30 at both ends of the first and second manifolds 23 and 25 and the first and second planar passages 24 and 26, and the second manifold. A first seal rod 31 is inserted through the seal plate 30 by sliding through the seal plate 30, and a seal plate is provided at the lower end of the second planar passageway 26 at a position in contact with the upper end of the lip land portion 29.
A second seal rod 32 is inserted by slidingly penetrating 30.

These first and second seal rods 31, 32 are provided by a position adjusting device provided outside the seal plate 30,
It has a structure in which the length of insertion is adjusted. This is the first
By rotating the handle 34 on the right side of the drawing, the holder assembly member 36 (the right slanted hatched portion on the right side of the figure) screwed with the screw shaft 35 whose axial position is fixed to the seal plate 30. ) Slides in the screw axis direction. The first and second seal rods 31 and 32 are the holder assembly members.
Since it is fixed to 36, position adjustment in the screw axis direction is possible.

The second seal rod 32 is fixed by a magnet catch method using a magnet 37 so that it can be easily inserted and fixed again after being pulled out and cleaned.

The first seal rod 31 has a thickness that does not inscribe the cylindrical second manifold 25, and has a thickness substantially equal to the gap of the second planar passage 26 on the tip side. Now
A forming plate 33 having a size such that the lower stage contacts the second seal rod 32 is provided.

The forming plate 33 has a curved surface where the joining point between the inner vertical end face and the lower end face is greatly curved so that the molten resin can be easily widened.

Next, the operation of the above-mentioned T die will be described. The molten resin is fed from a molten resin pumping device (not shown) to the first manifold 23.
It is supplied to the first manifold 23 through the supply pipe 22 in the central part of the. The molten resin spreads laterally in the first manifold 23, and the first planar passage below the first manifold 23.
Inflow to 24. During this time, the molten resin is widened in the lateral direction,
It is kneaded and flows into the second manifold 25 below the first planar passage 24. Here, the molten resin is kneaded again, the homogeneity is increased, the molten resin flows into the second planar passage 26, passes through the lip land portion 29, and is formed into a sheet or film having a predetermined thickness.

In this case, the first seal rods 31 are inserted into both ends of the second manifold 25 so as to fill the cross section of the second manifold 25 almost completely, so that the molten resin does not easily enter this portion. Further, a forming plate 33, which hangs from the first seal rod 31, is provided in the second planar passage 26 on the lower side of this portion with a thickness substantially equal to the gap of the second planar passage 26. So it is completely width regulated.

Furthermore, since the lower end of the forming plate 33 is a curved line and is in contact with the second seal rod 32, the molten resin is partially widened along this curved line to form a sheet or film. , It is possible to prevent the edge of the sheet or film from contracting due to surface tension after passing through the lip land portion 29 to become thick, and since the forming plate 33 and the second seal rod 32 are in contact, The width is restricted.

(Effect of the Invention) As described above, the T die of the present invention is provided with the double manifold and the planar passage, so that the molten resin is completely kneaded and the product quality is high.

Also, the forming plate 33 and the second seal rod 32
Since it is in contact with, the width regulation is perfect.

In addition, the forming plate 33 and the second seal rod
Since it is held by the same holder assembly member 36 as 32, there is no sliding between them in the case of width adjustment, and width adjustment is easy.

Since the second seal rod 32 is fixed by the magnetic catch method, the second seal rod 32 can be easily fixed after disassembly and cleaning.

[Brief description of drawings]

1 is a vertical sectional view of an end portion of a T-die of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, FIG. 3 is a transverse sectional view of a conventional T-die, and FIG. It is a BB sectional view of a figure. 21: die body, 22: supply pipe, 23: first manifold, 24:
1st planar passage, 25: 2nd manifold, 26: 2nd planar passage, 27: lip, 28: lip, 29: lip land part, 3
0: seal plate, 31: first seal rod, 32: second seal rod, 33: forming plate.

Claims (1)

[Scope of utility model registration request] 1. A T-die provided with a manifold extending in one direction at the tip side of a supply pipe provided at the center of a die body for receiving the molten resin pumped from a molten resin pumping device in a synthetic resin molding device. The manifold is provided in two stages in the direction perpendicular to the resin flow, and the first manifold, the first planar passage continuously connected to the entire width of the lower side of the first manifold, and the first manifold A second manifold provided below the first planar passage, a second planar passage continuously provided over the entire width of the lower side of the second manifold, and a second manifold It is composed of a lip land portion provided at the lower end, and slidably penetrates through the seal plate at the end so as not to come into contact with the inner surface of the second manifold. The first with a forming plate And a second seal rod provided by slidingly penetrating the seal plate at a position where it contacts the lips on both sides and the lower end of the forming plate at the upper end of the lip land portion, respectively. A T-die provided with a drive device for sliding the provided first seal rod and the second seal rod from the outside by the same distance in a direction parallel to the first manifold and the lip land portion. .