JPS6321123A - T-die for double-row sheet - Google Patents

Abstract

PURPOSE:To improve the width-directional accuracy and positional accuracy of a sheet by a method wherein the flow rates of two kinds of resins are adjusted with adjusting pieces on both sides of a separator and dams are provided alternately on both surfaces at the end part of the separator so as to flow the resins in the portions with no dam therein in order to realize double rows. CONSTITUTION:The flow rates of two resins A and B are adjusted by moving adjusting pieces 41 and 42, when the two resins A and B flow from manifolds 38 and 39 and between a die main body 21 and a separator 28 and a die main body 22 and the separator 28. Thin portions 46 and 47 are respectively formed in the separator 28 so as to start from the manifolds 38 and 39 respectively so as to flow one resin A between the portion 46 and the die main body 21 and between the portion 46 and a lip 23 and to flow the other resin B between the portion 47 and the die main body 22 and between the portion 47 and a lip 24. Dams 48 and 49 are alternately arranged at the end part of the separator 28. The resin B charged from an influx port 37 flows through gaps, each of which is made between a dam 49 and its adjoining dam 49. Similarly, the resin A charged from an influx port 36 flows through gaps, each of which is made between a dam 48 and its adjoining dam 48. The two resins flowing in a conflux zone 51 form a double-row sheet, when they are delivered from lips 30, which are alternately arranged.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to a T-die, and particularly to a T-die for double-row sheets with improved accuracy in the sheet thickness in the width direction and the width of each row.

[Prior Art] Conventionally, there are two types of methods for using a T-die for molding multiple sheets. The first method is as shown in FIG.
After merging in the distributor 14, the sheets 1 to 13 are sent to the T-die 15, where they are formed into three rows of sheets 16 to 18. In the T-die 15 of this method, the resin is already in double rows when it is supplied to the resin inlet, and the T-die 15 merely transforms this resin into a sheet shape. For this reason, for example, the center seat row 17
The width of the column can be freely changed depending on the amount of extrusion in each of the extrusions I3.11 to 13, and the positional accuracy of the rows also depends on the balance of the amount of extrusion. In addition, there is a large difference between the width of the inlet of the T-die 15 and the sheet width, and the resin must spread widely in the width direction within the T-die 15. Many molding tests were required. Furthermore, with this method, the different-phase fingers wrapped around other resins, resulting in a multilayer sheet rather than a double row sheet.

The second conventional method is a double-row sheet molding die in which the T-die has a plurality of resin inlets and the main resin flow has stripes corresponding to the number of inlets. A mechanism for adjusting the inflow amount is required before the flow is introduced, resulting in a large-scale and high-cost device.

[Purpose of the invention] The present invention eliminates such drawbacks, and its purpose is to
A T for double-row seats that has a relatively simple structure, lowers costs, and improves sheet width direction accuracy and positioning accuracy.
The goal is to provide the die.

[Summary of the Invention] The T-die for double-row sheets of the present invention includes a pair of die bodies, a fixed lip and a flexible lip fixed to the tips of the die bodies, and a pair of die bodies each having a fixed lip and a flexible lip fixed to the tips of the die bodies, each of which is connected to a different extruder. A manifold connected to the inlet where the resin flows, a separator that is located between the pair of die bodies and both lips and is thinned after the manifold to form a flow path for the two types of resin, and the thinned part of the separator. a pair of adjusting pieces that are provided slidably in the axial direction to face the separator and thereby adjust the amount of resin flowing along the separator; provided alternately on both sides of the
It is characterized by comprising a weir in which two types of resin are alternately arranged in the width direction of the die body by separating the different types of resin.

[Embodiment of the Invention] Hereinafter, a description will be given of FIGS. 1 to 4 showing an embodiment of the present invention. In FIG. 1, die bodies 21 and 22 each have a fixed lip 23 and a flexible lip 24 at their lower ends in the figure, which are positioned by positioning parts 25 and 26 and fixed by a plurality of bolts 27. A separator 28 whose position is fixed by a key or positioning pin (not shown) is placed in the middle, and these three are fixed by a plurality of bolts 29. Note that the tip 24A of the IIT bending lever 24 can adjust the lip 30, which is the gap between the two, by using an adjustment port (not shown) that pushes and pulls the tip of the fixed lip 23.

The die bodies 21 and 22 have inlet ports 36 and 37 through which two resins A and B from two extruders (not shown) flow.
are provided, and inlets 36 and 37 extend downward in the figure and are connected to manifolds 38 and 39. Therefore, the two resins A and B that have flowed into the die bodies 21 and 22 are spread in the width direction (perpendicular to the paper mold in FIG. 1) by the second holds 38 and 39. The manifolds 38 and 39 can be formed into any shape such as a coat hanger type manifold or a tapered type manifold. The separator 28 is thinner at the manifolds 38 and 39, and both sides of the separator 28 are thinner at the manifolds 38 and 39.
Forms part of 9.

In order to improve the thickness accuracy when two types of resin flow between the die bodies 21 and 22 and the thinned separator 28, a pair of adjustment pieces 41 and 42 are used as a flow rate: A adjustment mechanism.
are provided, and the adjustment pieces 41 and 42 are screwed into adjustment bolts 44 which are rotatable but prevented from moving in the axial direction by seat plates 43 fixed to the side surfaces of the die bodies 21 and 22. Therefore, when the adjustment port 44 is rotated, the respective adjustment pieces 41 and 42 are moved in the left-right direction in the figure to adjust the flow rate. Note that the adjustment pieces 41 and 42
By arranging a large number of them in the +tJ direction of the die body 21 etc., fine adjustment is possible. The two resins A and B, which have a substantially uniform flow rate (thickness) in the width direction in this manner, are separated by the separator 28.

2 is a partial perspective view of the separator 28, FIG. 3 is a sectional view taken along the line 3-3 in FIG. 1, showing the plane of the separator 28 and its lower part, and FIG. FIG. As shown in FIGS. 1, 2, and 4, the separator 28 has thin parts 46 (die body 21 side) and 47 (die body 22 side) formed from the manifolds 38 and 39. - A resin flow path is formed between the die body 47 and the die bodies 21 and 22 and both lips 23 and 24.

At the end of the separator 28, as shown in FIGS. 2 and 3, a weir 48 (die main body
1 side) and 49 (die body 22 side) are the separator 28
are arranged alternately on each side. Weir 48 here
The thickness of the separator 28 including the separator 2 and 49 is
8, the Bm fat from the inlet 37 flowing on the front side of FIG. 3 does not flow through the weir 49 but flows through the gap between the weir 49 and the adjacent weir 49. That is, B
In the case shown, the resin is divided into five layers. Similarly, the A resin from the inlet 36 does not flow through the weir 48, but flows into the weir 48 and V!
g flows through the gap between the weir 48 and the weir 48 in contact with it. In the case shown in the figure, the resin flows into four layers.

Therefore, as shown in FIG. 4, the distal end of the separator 28 is formed on the wound surface 50, and in the end view of the stages 48 and 49, the lower ends coincide as shown in FIGS. 2 and 3, so that the separator 28 and flowed into the confluence zone 51 (see Figures 1 and 3), the two resins A and B flow in the order of A/B/A/B/A/B/A/B/A in the case shown. When the sheets are alternately arranged and discharged from the lip 30, they form double rows of sheets. In addition, in Figures 2 and 3, 5
2 is a hole for the bolt 29, and 53 is a separator 28.
This is a hole for a positioning pin.

[Effects of the Invention] As explained above, the T-die for double-row sheets of the present invention has the following features: the flow rate of two types of resin is adjusted by adjusting pieces after the manifold and on both sides of the separator; Weirs were provided alternately on both sides of the ends, and each resin was made to flow through the parts without weirs to create a double row.
After the resin spreads in the width direction, it forms double rows. For this reason 2!
I! Even if the balance of the resin extrusion amount is poor, the width accuracy and positional accuracy of double rows are north-south, and furthermore, it has the advantage that double row sheet molding is possible with the same know-how as single q sheet molding.

[Brief explanation of drawings]

1 to 4 show an embodiment of the present invention; FIG. 1 is a sectional view, FIG. 2 is a partial perspective view of a separator, and FIG. 3 is a sectional view taken along line 3-3 in FIG. 4 is a sectional view taken along line 4-4 in FIG. 2, and FIG. 5 is a sectional view of the conventional example. 21, 22...Die body, 23...Fixed lip. 24... Flexible lip, 28... Separator, 36-
37... Inlet, 38-39... Manifold. 41, 42... Adjustment piece, 48, 49... Weir. Toshiba Machine Co., Ltd.; t-1 diagram ts diagram

Claims (1)

[Claims] a pair of die bodies, a fixed lip and a flexible lip fixed to the tips of the die bodies, a manifold connected to an inlet provided in the pair of die bodies and into which resin from a different extruder flows; A separator is located between the pair of die bodies and the lips and is thinned after the manifold to form a flow path for the two types of resin, and the separator swings in the axial direction in opposition to the thinned part of the separator. a pair of adjustment pieces that are freely provided to adjust the amount of the resin flowing along the separator; and a pair of adjustment pieces that are integral with the separator or manufactured separately and attached to the separator, and that are arranged alternately on both sides of the end portion of the separator. A T-die for double-row sheets, comprising a weir that is provided to separate the two types of resins so that the two types of resins are alternately arranged in the width direction of the die body.