JPS6027515A - Resin changeover valve of multilayer t-die extruder - Google Patents

Abstract

PURPOSE:To obtain many kinds of multilayer sheets with one piece of multilayer T-die by a method wherein a resin changeover valve is provided in a multilayer T-die and desired molten resin is charged into a plurality of manifolds. CONSTITUTION:Resin X comes from the resin passage 11 of a changeover valve body 12 to a manifold 17 through the resin passage 15 of a multilayer T-die 16, is widened here in the width direction to be made film type and the film goes outside from a slit 35 through a front slit 39. On the other hand, resin Y goes from the resin passage 23 of the change over valve body 12 to manifolds 33 and 34 through resin passages 31, 32, is widened here in the width direction, joined to the resin X to be laminated at a junction 38 through slits 36, 37 and goes outside through front slit 39. The section of the sheet formed in this manner is a three layer sheet Y/X/Y, but it is possible to form a two layer sheet of Y/X, X/Y by changing over a valve component 18.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a forming apparatus that supplies two types of Q raw materials from two extruders to form a multilayer sheet, and particularly relates to a molding apparatus that supplies two types of Q raw materials from two extruders to form a multilayer sheet, and in particular, it is possible to The present invention relates to a resin switching valve for a multilayer T-die which is modified to obtain a plurality of types of multilayer sheets with one multilayer T-die.

Forming a sheet using plastic multilayer film is done in 2 steps.
The extruder for melting and the multi-layer T-die integrated with this extruder were carried out using a single-layer T-die with a multi-layer feed block. Let X and Y be different types of plastic raw materials,
A sheet of 34 fl layers of Y/X/Y, X/Y, and Y/X is made fl.

Note that the X/Y and Y/X multilayer sheets are troweled on rolls set at a certain position (/%), so 1ul of tj
The two multi-sheets are of different types depending on whether l is pressed against the roll or not. This is 51. C In order to form multilayer sheets, conventionally three types of multilayer T-dies, etc. are prepared, or
Alternatively, the multilayer T-die is 2 of X/Y/X and x/y, iI
h class, and Y/X was depleted by changing the resin of the extruder using an X/Y multilayer T-die, etc.

Both methods require the use of T-dies for multi-layer use of the three gods, which increases the cost and reduces the time it takes to replace the guides.
I had lowered my sexuality. In Lingyu's method, the raw material resin supplied to the extrusion head is changed at the same time as the wire is replaced, so the R&J 1iiY before the raw material exchange remains in the extrusion head, and the change in the type of multilayer sheet I11! I spent a lot of time on it. Extrusion +
In order to shorten the change time due to the resin epicenter of Min', it is necessary to make the Iku J fat of 21 ``1'' to something similar in properties. ·Ta.

Akira Kimoto has removed such drawbacks, and its L1 purpose is to provide a multilayer T-die with a handle fat cutter valve to allow the desired melted fat to flow into multiple 172 holds.
Multilayer sheet with 11M1 multilayer T-die → 13]
V4 fat 1'i January toss valve 1 is 1II-.

The tree projector will be explained below with reference to a diagram showing an example. In FIGS. 1 and 2, −(1t!l) of the switching valve main body 12 having a resin passage All is a resin passage [0 passage Al
], the other π10 is connected to a multilayer T-die 16 having a tail side passage 15 communicating with the resin passage All, and the Jt7i fat passage 15 is connected to the manifold AI7. is connected to.

Resin passage A 11 K parallel one-way valve part of switching valve body 12)
lA18 is +α(llfj
It is inserted into the switching valve body 12 in a state where the leakage is prevented and the valve member 18 can be rotated by 6 f.
Q) It constitutes a switching valve. -1111 of the valve member 18 is the switching valve body 12 that communicates with the resin passage 22 of the adapter 2J.
49J fat passageway 823. In addition to the valve part 4, I18 (Il+ is in contact with the branching path force branched from the resin passage All. In this way, the valve member I8 has 4i71 on both sides.
As shown in FIG. 3, in the portions which are in contact with and in contact with the oil passage B23 and the branch passage 27I, two openings Z5 and J are provided. Therefore, at 11''fVc in FIG. 3, the empty space 5 is connected from the resin passage C2'7 of the switching valve body work 2 and the resin passage 028 to the switching valve main body 120' I +ii I trace path 9 and the resin passage D30. Multi-layer Tgui I6 through
4*4 IIh 11j111'531 and times 32
through manifold B 33 and manifold C3
+ii kA to 4. However, manifold A1
7, B33 and C34 each have slit 35
7. It is connected to the ridge tip slit 39 which follows the C-shaped stone 37 and merges between the merging points.

Next, the seasonal crop of the above-mentioned embodiment will be explained.

Resin X flows into the degreasing passage 13 of the adapter 14, and resin Y flows into the passage 22 of the adapter 2.・Follow the Tsukuda y finger passage 15 of the multilayer T die ■6 from the 1 fat passage All to reach the manifold Δ17, where it is expanded in the width direction and from the slit 35 at the film T and c, 'l::A slit 39 Exit outside through . resin jT
The branch passage 24 of IM A 11 is in contact with the valve member ]8,
If the joint member 18 were placed in the position shown in FIG. 3, the branching force would stop at the space 26 (the resin X would not flow through the branching force).

- The force resin Y connects the resin passage B23 of the switching valve body 12 by 3 [f
When the valve ti114'A18K is connected, as shown in FIG. r Y is divided into two from 2/Ji 251C, and from the resin passages C27 and 4029 of the switching valve body 12 and the resin passages D28 and 403u, the resin passages 31 and 32 of the multilayer T die 16 are jl, 14, It reaches the manifold B 33 and the manifold C 34, where it is expanded in the width direction, becomes a film, passes through the slits 36 and 37, and is formed into a merging seed layer with the resin X at the merging point, and exits through the tip slit 39.

FIG. 6 shows the cross section of the sheet formed in this way, and is y/x/y from 3j to sea 1-.

FIG. 4 shows the valve member 18 placed in a position h' from that shown in FIG.
5, the resin passages D28 and D30 of the switching valve body 12 and the resin passages D28 and D30 of the switching valve body 12 and the tree 11ti"1lf of the multilayer T die 16 pass through the branch path 24 and flow from the empty PfI26 of the valve part 018.
l path: U2] ll (There are two flows, one flowing through the nifold C34 and reaching the slit 37. - Ten thousand resin Y is cut →
4. % of the valve body 12 <jJ 1lJjTJ path B23 to the void δ of the valve member 18 #f:''C, grip crystal'' passages C27 and C29 and multilayer, T-die 16 (iV(,!i
fr a road 31 or r - r = t, - rd B33
This leads to the slit 36.

41411tr flowing through slits 35, 37 and I
x and Y follow the confluence point St + IC layer and tip slit;
There are two layers of X, and the X layer is twice as thick as the Y layer.

Also, the Y layer is upper HB K;! j.

FIG. 5 shows the case where the valve port 18 is placed in a different position from FIGS. 3 and 4, and the resin Through the void Akara resin C27 and times C4 and 4
+'iJ There are two flows through the oil passage 31 and the flow that passes through the manifold B 1:3 and reaches the temperature slit 3 (iK.On the other hand, IQ
The fat Y is cut off (from the resin passage B23 of the valve body 12 through the valve member 18 cavity 795 +v4 fat passage 1) 28 and the same D
3+1 and the multilayer T-die 16 (1 l of the manifold C34 from the 1 fat passage; 32) 1 to the slit 37. 35, 36 and 37 (fat
14 and exits to the outside through the slit 39. Figure 8 shows this L.
This shows the cross section of a sheet formed with j1 edges.Xl
There are two layers of Y, the X layer is twice as thick as the Y layer, and
, 4 is on top) 1b.

As mentioned above, the multi-layer T-die resin switching valve of the extruder in the Moku%6 Ming is attached to the multi-layer T-die when the two types of raw materials are supplied from two extrusion machines and made into a multi-layer sheet. 1゛11 fat on the - side -111
11 extruder to manifold A [through Jir3 fat i
The branch path from the resin passage A is connected to one side of the insertion hole, and the four-liter passage B from the extruder on the other side is connected to the other 11 rivers and 111 branches in front of the MF3 insertion hole. A switching valve connected in series on the daughter head of the switching valve, a valve member rotatably inserted into the insertion hole of the switching valve main body and provided with a hole I"Jr on both sides, and the branching path and the front NI tree Il. !It is composed of a resin passage C16 and a resin passage C16, which are provided directly on the line connecting the passage B and sandwiching the valve member, and which communicate from the cavity of the valve member to the manifold B and the manifold C.

Therefore, in the present invention, X and YO2Jiff11
゛When using 1 resin, 1 poly 1? Igawa T-dai l
! By switching the +4 oil switching valve, Y/X/Y and Y
/X and XlY three types of multilayer sheets are 51
I became Noh. For this reason, it is time to replace the conventional multi-layer T-die or multi-layer single-layer die with feed block, or the extrusion-like tree 1j? This eliminates the loss of time 111 due to changes, etc., and greatly improves productivity.

[Brief explanation of the drawing]

Each figure shows an embodiment of the present invention, and FIG. 1 is a longitudinal sectional view.
Figure 2 is a sectional view taken along the line 2-2 in Figure 1, and Figures ηN3 to 5 are
The figure is 3-5 in Figure 1! i! l? The valve member is different in the li side view. Fig. 6 is a sectional view of the molded product when the valve member is as shown in Fig. 3, Fig. 7 is a cross-sectional view of the molded product when the valve member is in the 4N position, and 81゛4 is the valve. FIG. 6 is a sectional view of the molded product when the member is shown in FIG. 5; 1]...Resin passage A, 12...Switching valve body, 16...
...Multilayer T-die, 17...Manibold A%18 River valve part, :) 13...1 fat passage B, C...branching path,
5, 26... Blank space, 27, 29... (Hi1 resin passage C, 28,: N... Resin passage D0 Applicant: Toshiba Machine Co., Ltd.

Claims (1)

[Claims] In a multilayer T die that supplies two types of raw materials from two extruders to produce a multilayer sheet, the multilayer T die is attached to the multihIT die, and the - side resin is transferred from the extruder on the one side to the manifold A. 41, and a branch path from the resin -+0 path A to -(till
At the same time, the resin passage B'ft from the extruder on the other side communicates with the switching valve main body, which is connected on the other side of the insertion hole and on the extension of the branch path, and the insertion hole of the switching valve main body. A manifold is provided on a line connecting the valve member which is rotatably inserted and has a cavity on both sides thereof, and the branch path and the resin passage B, and at a position sandwiching the fsiJ valve member, and is connected to the manifold from the cavity of the valve member. F'B and manifold CK communicate 4
A resin switching valve for a multilayer T-die for extrusion consisting of a TI4JIIr passage C and a resin +10 passage 0.