JPS6218334B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multilayer circular die,
More specifically, the present invention relates to an extrusion circular die having four or more layers, in which the thickness of each film layer can be easily adjusted.

In conventional multilayer circular dies (hereinafter referred to as "dies"), the range in which the thickness of each film layer can be adjusted is limited to three layers. For example, in a die in which all layers are laminated within the die, when trying to adjust the thickness of only one specific layer,
Even if you adjust the gap between the resin passages, the gaps in other adjacent resin passages will also change due to this adjustment, and as a result, the thickness of other resins that do not require adjustment will also change, and the thickness of each layer will change. It took time to adjust the thickness. Therefore, this type of die is limited to three layers, and beyond that it is impossible to obtain an extruded laminated film with substantially good thickness accuracy.

The present invention relates to a die that improves the above-mentioned drawbacks, and its gist is that at least four layers of sleeves 3, 4, 5, and 6 are successively fitted coaxially to the outside of a movable core 1 in the center, Core and sleeve, resin passages A, B, C, D between each sleeve
In a multilayer circular die having a mechanism for adjusting the gap between each resin passage separately, any one of the sleeves other than the outermost one is used as a fixed sleeve 3, and the inner and outer sides of the fixed sleeve 3 are In addition to forming resin passages of up to three layers each, two passages of each passage or merging passages E, F, and G are provided that merge within the die and lead out of the die, and the fixed sleeve 3 is provided with an activated gas blowout hole 2. This die is characterized by being provided with.

A more detailed explanation will be given below based on the attached drawings.

Fig. 1 is a front cross-sectional view of a four-layer die according to the present invention, in which the die has a combination of three internal adhesive layers and one die circumferential layer, and Fig. 2 shows a combination of two internal die adhesive layers. FIG. 3 is a front cross-sectional view of the die of the combination.

In FIG. 1, a fixed sleeve 3 having an activated gas blowout hole 2 and movable sleeves 4, 5, and 6 are fitted to the outside of a movable core 1 at the center.

Core 1 and sleeve 3, and sleeves 4 and 5,
Resin passages A, B, C, and D are formed between the fixed sleeves 3 and 6, and the resin passages B, C, and D on the outside of the fixed sleeve 3 merge inside the die and are guided from the merging passage E to the outside of the die.

To adjust the gap between each of the above passages, resin passage A
This is done by rotating the gap adjustment bolt 7 for the passage B, the bolt 8 for the passage B, and the bolt 9 for the passage C.

Further, the gap between the resin passages D is adjusted by adjusting a choker ring 10 located in the middle of the sleeve 6 with an adjustment bolt 11. Further, the gap between the merging passages E is determined by moving the adjustment ring 12 located at the top of the die using the adjustment bolt 13.

Molten resin extruded by a separate extruder (not shown) is introduced into each resin passage A, B, C, D through each resin introduction passage a, b, c, d, and resin passage B, The molten resin that has passed through C and D merges inside the die, is guided outside the die through the merging passage E, and outside the die, the resin that has passed through the resin passage A and the activated gas blowout hole 2 are combined. Each surface is activated with a jet of activated gas and then bonded to form a 4-layer film 17.
It is taken over as.

The thickness of each film layer is determined by each molten resin path A, B,
The four-layer film 1 obtained by finely adjusting C, D, and the gap between the merging passages according to the above-described configuration.
No. 7 provides excellent thickness accuracy of each film layer.

FIG. 2 is a die cross-sectional view of another embodiment of the present invention, in which the intra-die adhesive layer is a combination of two layers.

A fixed sleeve 3 having an activated gas blowout hole 2 and movable sleeves 4, 5, and 6 are fitted onto the outer side of the movable core 1 at the center.

Core 1 and sleeve 4, and sleeves 4, 3,
Resin passages A, B, C, and D are formed between 5 and 6, and the resin passages A and B are located inside the fixed sleeve 3.
C and D on the outside of the sleeve 3 join together inside the die, and are led out of the die through merging passages F and G.

The gaps between each of the above passages are determined as follows. That is, the resin passage B is adjusted by rotating the gap adjustment bolt 8, and the resin passage C is adjusted by rotating the same bolt 9.

Further, the gap between the resin passages D is adjusted by adjusting a choker ring 10 located in the middle of the sleeve 6 with an adjustment bolt 11.

The gap between the resin passages A is adjusted by an adjustment ring 100 provided in the middle of the core 1.
The adjustment ring 100 has an inclined surface on the opposite side of the resin passage A, and the inclined surface is in contact with the sliding piece 101. Then, by rotating the adjusting bolt 102 connected to the sliding piece 101, the sliding piece 101 is moved, and the adjusting ring 100 in contact with the sliding piece 101 is moved, thereby adjusting the gap in the resin passage A.

The molten resin extruded by a separate extruder (not shown) is introduced into each resin passage A, B, C, D through each resin introduction passage a, b, c, d, and the above-mentioned adjustment mechanism The thickness of each resin layer is adjusted at , and the resins that have passed through resin passages A and B are merged in the die and guided out of the die as a two-layer film from the merging passage F.
The resins pass through the resin passages C and D, merge within the die, and are led out of the die from the merge passage G as a two-layer film. Each of the two-layer films guided outside the die is bonded after each surface is activated by activated gas blown out from the activated gas blow-off holes 2, and taken off as a four-layer film 20.

When using this cap, four or more layers of resin passages are provided separately on the inside and outside of the fixed sleeve 3 so that there are three or more layers each, so when adjusting the thickness of each layer, it is necessary to Since the influence on is significantly large.

[Brief explanation of the drawing]

Figure 1 is a front cross-sectional view of a die according to the present invention that has a combination of three adhesive layers inside the die and one adhesive layer outside the die, and Figure 2 shows a combination of two adhesive layers inside the die. FIG. 3 is a front cross-sectional view of the die. 1 is a movable core, 2 is an activated gas outlet, 3 is a fixed sleeve having an activated gas outlet 2, 4, 5, 6 are sleeves, A, B, C,
D is resin passage, E, F, G are merging passages, 17, 2
0 is a 4-layer film.

Claims (1)

[Claims] 1 A sleeve 3 is placed on the outside of the movable core 1 in the center.
4, 5, and 6 are sequentially inserted in at least four layers coaxially, resin passages A, B, C, and D are formed between the core and the sleeve, and between each sleeve, and the gap between each resin passage is adjusted separately. In the multilayer circular die, any one of the sleeves other than the outermost one is used as the fixed sleeve 3, and resin passages of up to three layers are formed inside and outside of the fixed sleeve 3, and two or more paths of each passage are formed. A multilayer circular die characterized in that merging paths E, F, and G are provided for merging three paths inside the die and leading to the outside of the die, and the fixed sleeve 3 is provided with an activated gas blowout hole 2.