JPH0655402B2 - Coextrusion equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a coextrusion apparatus that uses a multi-manifold die or a single manifold die and is capable of easily changing the number of layers and / or the layer configuration. .

[Prior art]

In the conventional coextrusion apparatus, changing the number of layers and the layer structure had various measures shown below.

1. Change the resin supplied to the extruder.

2. Replace junction block.

3. Replace the feedblock.

4. Replace multi-manifold die.

5. Replace the plug in the middle of the feedblock.

However, in the method of changing the resin supplied to one extruder, in the co-extrusion equipment in which the melting characteristics and stability of the resin in the merging portion of each resin are important, the screw must be replaced each time according to the resin characteristics. This must be done, and this screw replacement significantly impedes productivity. Again 2.3
・ For each block or die exchange method of 4, the work time is slightly shorter than that of 1 method by separating and removing the connection adapter attached to the tip of each extruder and attaching a new one It is the same that the productivity of things is hindered.

The plug exchange method of No. 5 is the best in terms of productivity, but there is a gap between the two in order to insert the plug into the feed block. It is known that if the gap is 10μ, generally used resin will enter the gap. On the other hand, a gap of about 30μ is required to improve exchangeability of the plug. Then, the resin A enters the flow path of the resin B or the like and deteriorates the quality of the product. If the resin has poor thermal stability, the resin may deteriorate at the leaked part and the deteriorated product may enter the product or the plug may not come off.

[Object of the Invention]

The present invention eliminates such drawbacks and its purpose is to
Between both ends of the junction block and the multi-hold die or between both ends of the junction block and the feed block, a plurality of resin ports, which serve as a flow path for resin to be distributed in multiple layers via grooves, are provided on both sides. By arranging a pair of selector plates and changing the number of layers when changing the number of layers, the number of layers and the like can be changed easily to improve productivity and reduce cost. Another object of the present invention is to provide a co-extruder configured so that the flow of the resin that forms the multiple layers by being distributed to each layer in the selector plate does not accumulate.

[Main points of the invention]

The coextrusion apparatus of the present invention is a multimanifold die system having two or more layers of two types or a system in which a single manifold die and a feed block are combined, and a plurality of extruders are used to pass through a transport pipe. A pair of selector plates in which a junction block to which the molten resin is supplied and a resin port for receiving the molten resin from the junction block from each hole and distributing the resin in multiple layers through grooves provided on both sides are opposed to each other And a multi-manifold die or feed block that receives the molten resin distributed in multiple layers by the selector plate and transfers it to one molding port, and the selector plate is provided between the junction block and both ends of the multi-manifold die or feed block. Can be attached / detached from the side when replacing It has to, characterized in that.

Example of Invention

1 and 2 showing an embodiment of the present invention by a multi-manifold die system will be described below. In the figure, as an example, four extruders A to D are used. The extruders A to D are connected to the junction block 15 by resin transport pipes 11 to 14, and the junction block 15 communicates with each of the transport pipes 11 to 14 and a resin port of a selector plate 20 described later. 16 to 19 are provided. A recess is provided on the left side of the junction block 15 in the drawing, and two selector plates 20 are placed in the recess, and a holding plate 22 fixed to a multi-manifold die 21 by a bolt (not shown) is used, or By directly pressing the junction block 15 against the multi-manifold die 21 with bolts (not shown), the three members including the selector plate 20 are closely attached.

One of the two selector plates 20 on the right side in the drawing has resin ports 16 to 1 of the junction block 15.
As shown in FIG. 3, through holes 23 to 26 communicating with 9 are opened, and through holes 31 to 34 passing through resin ports 27 to 30 provided on the multi-manifold die 21 are opened on the left side. . A resin port 35 or a resin port 35 communicating with the hole 23, the hole 31, the hole 24, the hole 32, the hole 25, the hole 33, the hole 26, and the hole 34 is formed on each of the opposite surfaces of the pair of selector plates 20. 38 is provided.

Reference numeral 39 denotes a positioning stopper for the selector plate 20, and reference numerals 40 to 42 denote a lip adjusting piece and a flow rate adjusting piece, each of which is a set of two pieces, and an adjusting bolt (not shown) screwed to the multi-manifold die 21. Rotate 2
By adjusting the gap between the sheets, the thickness and uneven thickness of the molded product can be adjusted.

Next, the operation of the above-described embodiment will be described. 4 extruders A
The resin extruded from D to D is the transport pipes 11 to 14.
Through the junction block 15 to pass through the resin ports 16 to 19 through the pair of selector plates 20 to pass through the resin ports 27 to 30 of the multi-manifold die 21 to the outside to form a molded product.

Here, the resin ports 35 to 3 of the selector plate 20
If the arrangement of No. 8 shown as "1" in FIG. 3 is used, a molded product of A / B / C / D of 4 types and 4 layers is obtained from above as shown in the drawing. If the one shown as "2" is used, a D / C / B / A 4-type, 4-layer molded product is obtained, and "3" is obtained.
By using those shown as, a molded article of D / B / C / A of 4 types and 4 layers can be obtained. Also, if the one shown as "4" is used, a molded article of A / B / C / A type 3 and 4 layers can be obtained.
If you use the one shown as "5", it will be 3 of B / A / B / C.
A molded product of four kinds of layers can be obtained, and if a product shown as "6" is used, a molded product of three kinds of three layers of A / B / C can be obtained.
By using those shown as, a molded article of B / C / A of 3 types and 3 layers is obtained. Extruder D is not used in the case of a three-class molded product. It goes without saying that molded products other than the above are also possible by selecting the resin port of the selector plate 20.

When the molded product using "1" as the selector plate 20 is changed to "2", the bolts of the holding plate 22 or the bolts of the junction block 15 are loosened so that the clearance between the junction block 15 and the multi-manifold die 21 is increased. Unfold it, take out the selector plate 20 of "1", insert the selector plate of "2", and tighten the bolt again.

Next, FIGS. 4 and 5 showing an embodiment of the present invention by a system in which a single manifold die and a feed block are combined will be described. A to D in the figure
Since the extruder, the transport pipes 11 to 14, the holding plate 22, the junction block 15, the selector plate 20, and the stopper 39 are the same as those in FIGS. 1 and 2 described above, detailed description thereof will be omitted.

As shown in FIGS. 1 and 2, a recess is provided on the left side of the junction block 15 in the same manner as in FIGS. 1 and 2, and a pair of selector plates 20 is placed in the recess and a bolt (not shown) is attached to the feed block 51. 3) including the selector plate 20 is closely attached by pressing the junction block 15 to the feed block 51 through a holding plate 22 fixed by (4) or directly by a bolt (not shown). Since the feed block 51 is provided with resin ports 52 to 55 similar to the resin ports 27 to 30 of the multi-manifold die 21 in FIG. 2 described above, the resins are overlapped here. A single manifold die 56 is attached to the left of the feed block 51.

In FIG. 5, reference numerals 57 to 59 respectively denote a pair of lip adjusting pieces and a flow rate adjusting piece which are formed by rotating two adjusting bolts (not shown) screwed to the feed block 51 or the single mari hold die 56. By adjusting the gap between the two sheets, the thickness and uneven thickness of the molded product can be adjusted.

Further, the operation is the same as that in the case of FIG. 1 and FIG. 2 described above except that the overlapping of the resin is performed by the multi-manifold die 21, and in the case of the present embodiment, it is performed by the feed block 51. Omit it.

〔The invention's effect〕

As described above, the coextrusion device of the present invention replaces large devices such as conventional junction blocks, feedblocks, and multi-manifold dies, but replaces a small and lightweight selector plate, so replacement work is easy. Therefore, the exchange time is short, the productivity is high, and the cost is low.

Further, the pair of selector plates may have a circular shape that is the same as the axial direction by overlapping the groove shapes of the semi-circular resin ports on the opposing surfaces of the selector plates.
Therefore, the molten resin flowing from the multiple extruders through the transport pipe and through the circular holes in the junction block in the axial direction has the same circular shape in the selector plate as the axial direction without the corners. The holes can be passed continuously without causing retention.

[Brief description of drawings]

1 and 2 show an embodiment of the present invention by a multi-manifold die system. FIG. 1 is a plan view, FIG. 2 is a sectional view taken along line 2-2 of FIG. 1, and FIG. 3 is a selector plate. FIG. 4 is an explanatory view showing the arrangement of through holes and resin ports, FIGS. 4 and 5 show an embodiment of the present invention by a system combining a single manifold die and a feed block, FIG. 4 is a plan view, and FIG. FIG. 5 is a sectional view taken along line 5-5 of FIG. 4. 15 ... Junction block, 20 ... Selector plate, 21 ... Multi-manifold die, 35 to 38 ... Resin port, 51 ... Feed block, 56
...... Single manifold die.

Claims (1)

[Claims] 1. A coextrusion device of a multi-manifold die system having two or more layers of two types or a system in which a single manifold die and a feed block are combined, wherein (a) a plurality of extruders are passed through a transport pipe. A plurality of sheets 1 in which a junction block to which a molten resin is supplied and (b) a resin port for receiving the molten resin from the junction block from each hole and distributing it in multiple layers via grooves provided on both sides are opposed to each other 1 A pair of selector plates, and (c) a multi-manifold die or feed block that receives the molten resin distributed in multiple layers by the selector plate and transfers it to one molding port, (d) the junction block and the multi block When replacing the selector plate between both ends of the manifold die or feed block A co-extrusion device characterized in that it can be inserted and removed from the side.