JPH04307220A - T-die with deckel - Google Patents

Abstract

PURPOSE:To remove a non-resin space, in which a creeping resin stays, and to improve sealing properties on the sealing surface of a slit while facilitating purge work. CONSTITUTION:A pair of die lips 53, 54, at front ends of which a slit 5 is formed, and both ends of a die body 51 are closed by side plates 62, and a pair of deckels 57 disposed in a forward and retreat--free manner in a manifold 4 and slid in an airtight manner are installed. The deckels 57 are penetrated through the side plates 62 while having the same cross section as the manifold 4 and extended backward, thus completely removing a creeping resin at a time when the inside of the manifold 4 is supplied with the resin. Since the deckels 57 are composed of main deckels 58, sub-deckels 59 relatively disposed to said main deckels 58 slidably through a tapered surface 61 and sealing means, the sub-deckels 59 are moved relatively to the main deckels 58 and clearances in the height direction of the deckels 57 can be varied, thus fast sticking the deckels sections forcibly in a whole surface manner, then sealing the deckel sections.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a T-die with a deckle connected to the tip of an extruder for extrusion molding.

0002

[Prior Art] Conventionally, an extruder for extrusion molding films and sheets has a T-die connected to its tip, and a molten resin is extruded through the T-die to extrude films and sheets.
Molded products having the same cross section in a plate shape such as sheets are molded, and extruded molten resin is molded into laminate films and laminate sheets as extrusion laminate molded products. Further, in order to change the width dimension of the molded product in the same T-die, a width regulating deckle is provided.

[0003] In the case of plate-shaped molded products such as films and sheets, the extrusion port has a slit shape. Figure 2
is a front view of a conventional T-die with a deckle. In the figure, 2 is a T-die main body, and the resin melted in the extruder is supplied to a manifold 4 via a resin injection port 3. The manifold 4 is formed to extend over the entire length of the T-die body 2, and the resin supplied from the resin injection port 3 is extruded from the slit (lip land) 5 and formed into a plate shape. Therefore, as will be described later, the manifold 4 has a shape such that the molten resin forms a plate having a uniform thickness from the top to the bottom.

[0004] The T-die with a deckle is designed so that the molding width can be changed by changing the resin outflow width with the same T-die main body 2 as necessary. That is, deckles 7 and 8 are disposed at both left and right ends of the manifold 4 so as to be slidable and move forward and backward, and by moving the deckles 7 and 8 to the center, the width of the molded product can be reduced. , the width of the molded product can be increased by moving it to both the left and right ends. Therefore, both deckles 7 and 8 are connected to deckle moving drive mechanisms 10 and 11 via a screw sliding mechanism.

FIG. 3 is a side view of a conventional T-die with a deckle. In the figure, 2 is a T-die with a deckle,
It is formed by stacking the die lips 13 and 14 back and forth. Tighten the above die lips 13 and 14 with the adjuster screw 1.
5 and 16, the gap between the slits 5 can be adjusted.

FIG. 4 is an enlarged view of the main part of a conventional T-die with a deckle. (a) of the figure is a cross-sectional view of the main part, and (b) is a longitudinal cross-sectional view of the main part. In the figure, 4 is a manifold, and 5 is a slit for extruding the resin supplied from the manifold 4. The width of the slit 5 can be changed by moving the die lips 13, 14 as shown in (a).

The manifold 4 is comprised of an upper main manifold section 21 and a pressure manifold section 22 that extends downwardly and continuously from the main manifold section 21. The deckle 7 (or 8) has a shape that allows it to slide airtight inside the manifold 4. In other words, deckle 7 is inside manifold 4.
A resin space 26 and a non-resin space 27 are defined in between, and the resin in the resin space 26 is essentially prevented from leaking into the non-resin space 27. Note that the non-resin space 27 is surrounded by the die body 2, the deckle 7, and the side plate 28.

The deckle 7 has a first main manifold shaped portion 24 and a second pressure manifold shaped portion 2.
5, and both can be relatively displaced or placed in an aligned position, but extrusion is performed with both placed in an aligned position. That is, the first main manifold-shaped portion 24 is fixed to a connecting shaft 31 that is disposed through the side plate 28, and by moving the connecting shaft 31 from side to side, the deckle 7 is moved.
The first main manifold shaped portion 24 of can be moved from side to side. Therefore, a sliding screw 32 is screwed into the connecting shaft 31. The sliding screw 32 is regulated from moving in the axial direction by a support member 33 and is rotatably supported. The sliding screw 32 is connected to a handle 36 via gears 34 and 35, and by turning the handle 36, the sliding screw 32
2, and a connecting shaft 31 that is screwed into the sliding screw 32.
can be moved left and right. In addition, the above-mentioned connecting shaft 3
1 requires a seal to prevent the resin under high temperature and pressure from leaking, so it has a circular cross section, and a sealing member 45 is disposed between it and the side plate 28. There is.

The large-diameter rod-shaped body 43 of the seal deckle 41 is a seal deckle whose tip end is fixed to the second pressure manifold-shaped portion 25 and extends slidably along the slit 5. The seal deckle 4
1 is a small-diameter rod-shaped body 4 disposed adjacent to the slit 5;
2, and a large-diameter rod-shaped body 43 disposed adjacent to and above the rod-shaped body 42. Both rod-shaped bodies 42 and 43 can be moved relative to each other.

In order for the deckle 7 to slide within the manifold 4, it is necessary to form a clearance between the two, and the deckle 7 has a composite combination structure, in which the first main manifold shaped portion 24 and the second A clearance is formed between the two pressure manifold shaped portions 25. Therefore, the resin supplied to the manifold 4 in a molten and pressurized state is transferred to the clearance between the die body 2 and the deckle 7, the first main manifold shaped portion 24
and the second pressure manifold shaped portion 25 and enters into the non-resin space 27, filling the non-resin space 27. In that case, the recirculating resin filling the non-resin space 27 is
Since it is sealed by a seal deckle 41 made up of three parts, it is prevented from coming out from the slit 5 and is discharged from the discharge hole 47 formed in the side plate 28. There is also a type that actively utilizes the pressure of the filled resin for sealing.

[0011]

[Problems to be Solved by the Invention] However, in the conventional T-die with a deckle, the recycled resin remains in the non-resin space 27 and is exposed to high temperatures for a long period of time, causing a portion of the molten resin to turn into solid resin. (resin burnt) and fluidity decreases, which makes purging work difficult and remains even after repeated work.

[0012] The only way to completely purge the remaining resin is to disassemble and clean it, and usually purging is carried out by a purge action that utilizes the dynamic pressure of the resin flow. In this case, the amount of resin required to purge the resin whose fluidity has decreased is large, and the purging process takes a long time, especially when molding a narrow molded product and then a wide molded product. It becomes necessary.

[0013] Since the amount of loss resin discharged for the purging operation is large, not only does the molding cost of the molded product increase, but also the resin remaining after the purging operation is discharged during molding, causing the molding The product becomes defective and the yield rate decreases. In addition, since the seal deckle 41 has a structure in which the rod-shaped body 42 is brought into contact with the sealing surface of the slit 5 by resin pressure, the rod-shaped body 42 is usually formed of a flexible non-ferrous round rod, and has a high strength. It is weak and easily deforms due to resin penetration or sliding. In other words, the sealing effect lacks reproducibility and stability, and resin leaks easily.
It takes a lot of effort and time to eliminate the problem, and deformation over time causes production loss of molded products.

The present invention solves the problems of the conventional T-die with deckle, eliminates the non-resin space where the recycled resin enters and stays, improves the sealing performance on the sealing surface of the slit, and improves the purge. The purpose is to provide a T-die with a deckle that does not require a large amount of loss resin for operation.

[0015]

[Means for Solving the Problems] To this end, the T-dies with deckles of the present invention are disposed facing each other and extending in the width direction of the molded product, and a resin injection port and a manifold are formed between them. The die body has a die body, a pair of die lips forming a slit at the tip, and a side plate that closes both ends of the die body and the die lip.

[0016] A pair of width regulating deckles are provided within the manifold so as to be movable forward and backward from both left and right ends toward the center, and slide airtightly within the manifold. Move the deckle forward and backward within the manifold. The deckle extends rearward through the side plate while having the same cross section as the manifold.

[0017] Further, the deckle includes a main deckle connected to the deckle moving mechanism, a sub-deckle disposed so as to be slidable relative to the main deckle via a tapered surface, and the sub-deckle. The main deckle and the sub deckle can be freely separated by a sealing means formed between the slits. Further, the sealing means may be a seal deckle that is separably arranged from the sub deckle.

[0018]

[Operation] According to the present invention, the die bodies are disposed facing each other and extending in the width direction of the molded product, forming a resin injection port and a manifold therebetween, and a slit at the tip. It has a pair of die lips forming a die lip and a side plate closing both ends of the die lip, and is disposed within the manifold so as to be movable forward and backward from both left and right ends toward the center, and slides airtight within the manifold. A pair of width regulating deckles are provided, and a deckle moving mechanism moves the deckles back and forth within the manifold. Therefore, by operating the deckle moving mechanism, it is possible to change the resin outflow width and the width of the molded product as needed using the same T-die.

The deckle extends rearward through the side plate while having the same cross section as the manifold. Therefore, when resin is supplied into the manifold, the resin that enters through the clearance between the deckle and the manifold is completely eliminated since there is no space. The deckle also includes a main deckle connected to the deckle moving mechanism, a sub-deckle that is slidably arranged relative to the main deckle via a tapered surface, and a space between the sub-deckle and the slit. By moving the sub deckle relative to the main deckle, the clearance in the height direction of the deckle can be increased or decreased.

[0020] The main deckle and the sub deckle can be made separable, and the sealing means can be a seal deckle that is separable from the sub deckle, so that processing and assembly of the deckle is easy. It can be easily attached.

[0021]

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Figure 1 shows the T with deckle of the present invention.
FIG. 5 is an enlarged view of the main part of the die, and FIG. 5 is a side view of the T-die with deckle of the present invention. Figure 1 (a) is a cross-sectional view of the main part, (b)
is a vertical sectional view of the main part.

In FIG. 5, 51 is a T-die main body;
A pair of front and rear die lips 53 extending in the width direction of the molded product
, 54. Normally, the gap between the slits 5 can be adjusted by adjusting the die lips 53 and 54 using adjuster screws 55 and 56. Moreover, in FIG. 1, 4 is a manifold, and 5 is a slit for extruding the resin supplied from the manifold 4. The width of the slit 5 can be changed by moving the die lips 53, 54 as shown in (a).

The manifold 4 is comprised of an upper main manifold section 21 and a pressure manifold section 22 which is formed to extend downwardly following the main manifold section 21. In the manifold 4, a width regulating deckle 57 is disposed such that it can move forward and backward from both left and right ends of the T-die main body 51 toward the center. The deckle 57 has a shape that allows it to slide airtight inside the manifold 4, and the deckle 57 is used for regulating the left and right widths.
7 forms a resin space 26. By moving the deckle 57 toward the center, the resin space 26 can be made smaller and the width of the molded product can be made smaller. Further, by moving the deckle 57 to both the left and right ends, the resin space 26 can be enlarged, and the width of the molded product can be increased.

The deckle 57 is constructed by combining a main deckle 58, a sub deckle 59, and a seal deckle 60, which extend through side plates 62 that close both ends of the die body 51. The main deckle 58 has a tapered surface 61 whose dimension (dimension in the height direction in the figure) increases from the front end 58a to the rear end 58b in the advance/retreat direction. Further, the sub deckle 59 has the tapered surface 6
1, and has a shape in which the dimensions become smaller from the front end 59a to the rear end 59b in the advancing and retreating direction. The seal deckle 60 has the same size from the front end 60a to the rear end 60b in the advance/retreat direction, and is disposed further below and adjacent to the sub deckle 59. Each of the above deckles 58, 59
, 60 are inclined so as to diverge from the top to the bottom, as shown in the figure, when the respective deckles 58, 59, 60 are placed in alignment. Furthermore, a flag 6 is provided at the lower end of the seal deckle 60 over the entire length of the seal deckle 60.
3 is fixed and extends outside the slit 5.

In this way, the deckle 57 is constructed by combining the main deckle 58, the sub deckle 59 and the seal deckle 60, which are connected to the front end 58.
a, 59a, 60a to the rear ends 58b, 59b, 60b have the same cross section as the cross section of the manifold 4,
It occupies the entire space up to both left and right ends of the manifold 4. Therefore, there is no resin flowing in from the resin space 26 at all.

Furthermore, since the deckle 57 requires a seal to prevent the resin under high temperature and pressure from leaking, a seal case 65 is provided at the portion where the deckle 57 penetrates the side plate 62. Seal case 6
A seal block 66 is disposed within 5. The seal block 66 utilizes the sealing properties of the mutually polished planes of the side plate 62 and the deckle 57, and the pressure drop due to the relatively long minimal clearance, and the seal block 66 is divided into upper and lower halves. , an expansion spring 67 is disposed between the opposing surfaces, and pressing screws are disposed on each outer surface of the seal case 65 to apply a biasing force as shown by the arrows to pressurize the seal block 66 and to It is adjusted so that it is in the correct position.

The seal case 65 is made as large as possible to prevent self-leakage by utilizing the reduction in resin viscosity due to heat dissipation and cooling. Further, depending on the resin used and the temperature used, a special heat-resistant packing 69 can also be used together with the seal block 66. Incidentally, a deckle moving drive mechanism 10 is provided to move the deckle 57 forward and backward within the manifold 4. That is, at the rear of the main deckle 58, a sliding screw 32 is disposed to be screwed together. The sliding screw 32 is regulated from moving in the axial direction by a support member 33 and is rotatably supported. The sliding screw 32 is connected to a handle 36 via gears 34 and 35.
By turning , the sliding screw 32 can be rotated, and the main deckle 58 that is screwed onto the sliding screw 32 can be moved left and right.

Furthermore, in order to allow the deckle 57 to slide smoothly within the manifold 4 with almost no clearance, the main deckle 58, sub deckle 59, and seal deckle 60 are all slid by a separable holder 71. The manifold 4 and the deckle 57 can be freely held and the clearance can be adjusted by an adjustment mechanism 72 so that the dimensions in the height direction of the manifold 4 and the deckle 57 match.

The rear deckle holder 73 is supported relative to the separable holder 71, and the adjustment screw 75 is rotatably supported with respect to the rear deckle holder 73, with axial movement restricted. Therefore, the adjustment screw 7
By rotating 5, the sub deckle 59 can be moved left and right, and the sub deckle 59 can be provided with a screw thrust sliding function. That is, by rotating the adjustment screw 75, the sub deckle 59 is adjusted to the tapered surface 6.
When the deckle 57 is moved to the right along line 1, there is no clearance in the height direction of the deckle 57, almost no resin enters, and there is no need to purge the resin when changing the width of the molded product. Further, since the seal deckle 60 is pressed against the sealing surface of the slit 5, the two are forcibly brought into close contact over the entire surface, improving sealing performance.

Furthermore, the sub deckle 59 and the seal deckle 60 can be easily removed from the main deckle 58 by separating the separable holder 71, which not only facilitates processing and assembly. This also facilitates compatibility and modification of the edge shapes of the front ends 58a, 59a, 60a. Since the seal deckle 60 is formed of a plate-shaped member, it has high strength and can prevent deformation. In addition, the adjustment screw 75
By rotating the sub deckle 59 in the opposite direction and moving the sub deckle 59 to the left, clearance in the height direction is created for the deckle 57, which not only makes it possible to optimize the sliding force but also makes the operation smoother. , the seal deckle 60 can be easily moved or converted.

For this reason, the sub-deckle 59 and the seal deckle 60 are separated, and their relative positions can be changed using an adjusting screw 76. Further, since the seal deckle 60 is made of a polished plate material, it comes into surface contact with the sealing surface of the slit 5. Therefore, the contact area becomes larger,
Leak pressure drops. In addition, Seal Dickel 60
Since the flag 63 is attached to the entire length of the flag 63, the leak resin is cooled individually by the heat dissipation cooling of the flag 63.
Further sealing effect can be obtained.

[0032] Since each surface of the deckle 57 can be easily polished and re-polished, the clearance can always be minimized, and the space into which the resin can enter can be made extremely small. Also, manifold 4
Since there is no need to adjust the clearance or incorporate any parts for giving the deckle 57 a pressurizing function, troubles due to clearance and troubles due to built-in parts will not occur.

Note that the present invention is not limited to the above-mentioned embodiments, and various modifications can be made based on the spirit of the present invention, and these are not excluded from the scope of the present invention.

[0034]

As described above in detail, according to the present invention, two die bodies are arranged to face each other and extend in the width direction of a molded product, and form a resin injection port and a manifold therebetween. and a pair of die lips forming a slit at the tip,
A pair of width regulators, which have side plates that close both ends of the die body and the tie lip, are disposed within the manifold so as to be able to move forward and backward from both left and right ends toward the center, and which slide airtightly within the manifold. A deckle is provided for use in the manifold, and a deckle moving mechanism moves the deckle forward and backward within the manifold. Therefore, by operating the deckle moving mechanism, it is possible to change the resin outflow width and the width of the molded product as needed using the same T-die.

The deckle extends rearward through the side plate while having the same cross section as the manifold. Therefore, since there is no space to accommodate the run-in resin, when resin is supplied into the manifold, no run-up resin enters through the clearance between the deckle and the manifold. In addition, the above deckle is
a main deckle connected to a deckle moving mechanism;
It is composed of a sub-deckle that is slidably disposed relative to the main deckle via a tapered surface, and a sealing means formed between the sub-deckle and the slit, so that the sub-deckle can be attached to the main deckle. By moving the deckle relative to the deckle, the clearance in the height direction of the deckle can be increased or decreased.

That is, by reducing the clearance in the height direction of the deckle, there is no intruding resin, and there is no need to purge the resin when the width of the molded product is changed. Furthermore, since the sealing means is pressed against the sealing surface of the slit, the two are forcibly brought into close contact, improving sealing performance. Furthermore, by increasing or decreasing the clearance in the deckle height direction, the deckle sliding force can be optimized, resulting in smoother operation.

[0037] The main deckle and the sub deckle can be made separable, and the sealing means can be a seal deckle that is separably arranged from the sub deckle, so that processing and assembly of the deckle is easy. It can be easily attached.

[Brief explanation of the drawing]

FIG. 1 is an enlarged view of main parts of a T-die with deckle according to the present invention.

FIG. 2 is a front view of a conventional T-die with a deckle.

FIG. 3 is a side view of a conventional T-die with a deckle.

FIG. 4 is an enlarged view of main parts of a conventional T-die with deckle.

FIG. 5 is a side view of the T-die with deckle of the present invention.

[Explanation of symbols]

4 Manifold 5 Slit (lip land) 10
Deckle moving drive mechanism 51 T-die main body 53, 54 Die lip 57 Deckle 58 Main deckle 59 Sub deckle 60 Seal deckle 61 Tapered surface 62 Side plate

Claims (4)

[Claims] Claim 1: (a) die bodies that are disposed facing each other and extending in the width direction of the molded product and that form a resin injection port and a manifold therebetween; (b) a slit is formed at the tip. a pair of die lips; (c) a side plate that closes both ends of the die body and the die lip; and (d) a side plate that is disposed within the manifold so as to be movable toward the center from both left and right ends, and that is airtight within the manifold. sliding to 1
It consists of a pair of deckles for width regulation, and (e) a deckle moving mechanism for moving the deckle forward and backward within the manifold, and (f) the deckle passes through the side plate while having the same cross section as the manifold. A T-die with a deckle that extends backwards. 2. The deckle includes a main deckle connected to a deckle moving mechanism, a sub deckle disposed so as to be slidable relative to the main deckle via a tapered surface, and the sub deckle. A T-die with a deckle according to claim 1, further comprising sealing means formed between said slits. 3. The T-die with a deckle according to claim 2, wherein the main deckle and the sub deckle are separable. 4. Claim 2, wherein the sealing means is a seal deckle that is separably arranged from the sub deckle.
T-die with deckle as described.