JPS6189823A - Molding equipment of co-extruded resin laminated body - Google Patents

Abstract

PURPOSE:To easily correspondingly control the flow gaps of the branch passages in response to the thicknesses of a front surface layer and of a back surface layer by a structure wherein a liner for thickness control is set to the branch passage formed on a laminated resin distributing piece. CONSTITUTION:A liner 14 is set by being fitted in the branch passage 13B of a laminated resin distributing piece 8 in the following manners: 1. The diffusing curved surface part 14f of the liner 14 for thickness control shows itself at the outlet part 13 of the branch passage 13B. 2. A diminishing curved surface part 14e shows itself at the transition zone ranging from the upper end of a leading-in passage 13A to the branch passage 13B. 3. An upper band-like surface 14g and a lower band-like surface 14h, both of which respectively located at the upper part and the lower part of an arc-shaped groove part so as to be laterally parallel with the arc-shaped groove part, are respectively formed so as to lie on the extended surface of the peripheral surface of an inserting part 11. Accordingly, the resin passing at the liner 14 smoothly proceeds from the diminishing curved surface part 14e at the end of the liner to the arc-shaped groove part and, after that, proceeds from the arc-shaped groove part to the diffusing curved surface part 14f and further without turning into the state of turbulent flow.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a coextrusion resin laminate forming apparatus for forming synthetic resins into multiple layers and forming a composite.

(Prior art) Using two or more extruders or extrusion units, the VR material supplied from each extruder or extrusion unit is
) In co-extrusion molding, sheets, films, etc. that have been combined into a composite and multilayered are extruded from a die, and the laminate resin is distributed to a feed block installed between the die joint and the die, which has an intermediate layer resin passage. A passage is provided, and the laminating resin is distributed from the intermediate layer resin passage to the intermediate layer resin, and the outer layer resin to be laminated is fed through the passage.

The laminate 4Ml is supplied from a single extruder and is distributed to the resins forming the front and back layers respectively. In order to prevent this, the flow rate is usually kept unchanged so that it remains at a predetermined flow rate.

On the other hand, is it possible to change the thickness of the laminated resin layer supplied from one extruder? ! There is a method U1 shown in Japanese Patent Publication No. 57-57258 as a means for changing and adjusting the flow rate gap between one passage or two one-way and one-way passages, and the distribution of two numbers is the mainstream among such means. A channel, a plurality of sub-channels provided in one or more stages substantially parallel to the main channel, an upstream section and a downstream section, with both ends of the upstream section connected to the sub-channel, and a plurality of sub-channels provided in one or more stages substantially parallel to the main channel. A tubular sub-channel opening/closing adjustment tool having a branch channel whose lower end is connected to the main channel, and which is rotatable and has a hole in the sub-channel, is fitted in the sub-channel, and the downstream end of the channel is rotated. A distributing unit kneader for coextrusion molding has been proposed which is movable or rotatable and is provided with a flow adjustment device fJf1 having holes or grooves.

(Problems to be Solved by the Invention) Sub-channel opening/closing regulators and branching: When the A-channel flow regulator is used, the equipment becomes complicated and maintenance and inspection is not easy (and the area occupied by the equipment is also large). Therefore, instead of such a method, laminate (H fat distribution) ensures a continuous and smooth flow in the flow gap in the channel without causing turbulence, and the thickness of the laminated resin layer. There was a need for a means to quickly and easily deal with the problem.

(Means for solving the problem) The present invention is a laminate (H fat distribution is such that the flow rate gap of the distribution path of the piece is adjusted by a thickness adjustment nest. A feed block provided between the die joint and the die is attached to the block body, and a laminate 1~ which can be freely fitted and detached into the mounting hole of the block body.
The resin distribution is formed from the piece, and the laminated resin distribution 1) is formed at the inserting part of the piece, and a replaceable thickness adjustment nest is set in the branching path of the path. This is a coextrusion resin laminate forming apparatus characterized by:

(Function) In the present invention, the laminated resin distribution can adjust the flow rate gap by the desired thickness adjustment nest set at the branching path of the road, so the laminated resin can be distributed according to the thickness of the surface layer and the back layer made of the laminated resin. You can easily replace the nest for adjusting the thickness of the station valve, and adjust the flow rate gap of the branch road accordingly. '7ru.

(Example of fruit eggplant) Embodiments of the present invention will be described with reference to the drawings.

As shown in FIGS. 1 and 2, the extrusion IU for laminating resin is placed in the feed block 4 between the die joint 2 and the flat die 3 of the extrusion section 1 for intermediate fat control. ! 5 die joints 6 are connected.

As shown in FIGS. 1 and 2, the feed block 4 is attached to the block body 7 and the laminate resin distribution piece 8 is attached to the block body 7, and the laminate resin distribution piece 8 is attached to the mounting hole 9 provided in the block body 7. It is.

The laminate resin (as shown in FIGS.
38r: The cylindrical 1IrI blowing part 11 following 110 curves, and the 1ITI eight part 11 has a circular hole-shaped entrance 111 on one side of the circumferential surface, and an intermediate hole with a circular hole-shaped outlet 12b. One flow path 12 for the layer resin is formed, and an introduction path 13A parallel to the axis of the insertion part 11, and a branch path 13 branched from this introduction path 13A in the circumferential direction of the insertion part 11.
B.

One length of the laminate resin made of 13C is formed with a channel 13 in the form of a groove on the circumferential surface of the insertion part 11, and the outlet is formed on the same straight line along the axis of the insertion part 11 passing through the center of the outlet opening 12b. Exit portion 13 of branch path 13B is located above opening 12b.
', and the branch path 13C is located below the exit 12b.
Exit portions 13' and 1 are located at the ends of a branch path 13B extending circumferentially from the upper end of the introduction path 13A and a branch path 13G extending circumferentially from the lower end of the introduction path 13A, respectively.
3 is a position that has gone one-fourth of the way from the introduction path 13A and is arranged at the same distance in the vertical direction from the outlet frontage 12b.

Further, in this case, a thickness adjusting insert 14 is fitted and set in the upper branch path 13B.

As shown in FIG. 6, the thickness adjusting insert 14 has a horizontally elongated shape when viewed from above, and as shown in FIG. The branch path 13 is formed as a semi-IY(R) arc that is the same as the circumferential surface of the fitting part 11, and the arcuate inner edge 14b is an arcuate groove formed on the circumferential surface of the fitting part 11.
It is an arc with the same radius (r l>) as the arc connecting the bottoms of B, and the arc connecting the bottoms of the arcuate grooves 14c bored in the nest 14 is an arc with radius (r2), and the radius (R)
, (r ri, D 2) are smooth (center (0)), therefore, the arc connecting the arcuate inner edge 14b and the bottom of the arcuate groove 14G and the arcuate outer edge 14a are concentric arcs.

Furthermore, as shown in FIG. 6, the nest 14 has an end edge 14d that matches the inner surface of the transition part from the upper end of the introduction path 13A to the branch path 13B, and gradually extends from this edge 14d to the arcuate groove 14C. A continuous contracting curved surface portion 14e that gradually transitions is formed, and a diffusion curved surface portion 14'' that gradually expands from the arcuate groove portion 14G is formed at the other end, as shown in the cross section taken along the line XI-XI in FIG. As shown in FIG. 11, the semicircular shape is formed to form a continuous arcuate groove consisting of a reduced curved surface portion 14C at one end, an arcuate groove portion 14c, and a diffusion curved surface portion 14 at the other end. .

As shown in FIGS. 3 and 4, when the nest 14 is fitted into the branch path 13B, the outlet 13' of the branch path 13B is
The diffusion curved surface portion 14f of the nest 14 appears, the reduction curved surface portion 14e appears at the transition portion from the upper end of the introduction path 13A to the branch path 13B, and the arcuate groove portion 14C extends from the circumferential surface of the insertion portion 11. Upper band surface 14 (l
The lower belt-shaped surface 14h located below is laterally parallel to the arcuate groove 14C.

The introduction path 13A is in communication with the laminate resin introduction hole 15 of the block body 7, and is connected to the flow path 16 of the die joint 6 of the extruder 5 connected to one side of the feed block 4.
is in communication with the laminate resin introduction hole 15.

In this way, the laminate resin is distributed to branch path 13 of piece 8.
Insert the nest 14 into B, and insert the insertion part 11 from the upper #ii opening of the mounting hole 9 of the feed block 4 to match the intermediate layer resin flow path 12 and the intermediate layer flow path 17 of the feed block 4. Align the introduction path 13A with the laminate resin introduction hole 15 f] Fix the panel part 10 with the set screw 18°1
8..., furthermore, the lower end opening of the mounting hole 9 is closed with a lid 19, the outlet opening 12b of the intermediate layer resin flow path 12 is aligned with the intermediate layer flow path 17 of the feed block 4, and the nest 14 is fixed by The outlet part 13' of the branch passage 13B that is fitted in is connected to the resin flow passage 20 for the back layer of the feed block 4.
The outlet portion 13'' of the branch path 13C is set to match the surface layer resin flow path 21 of the feed block 4.

Sheet-like formation path 17a in which the intermediate layer flow path 17 of the feed block 4 expands laterally from side to side 1. :Resin channel 20 for one layer
The sheet-like forming paths 20.1 which spread laterally left and right merge from the upper side, and the sheet-like forming paths 20.1 which spread laterally left and right of the surface layer resin flow path 21 merge from the lower side to form a merged path, This merging passage communicates with the flow passage 3a of the die 3.

In the figure, 22 is a flow rate adjusting blade, and 23 is a de-strivi collision bin.

Since the device of the present invention is constructed as described above, for example, the surface layer is a glossy polypropylene resin layer with a thickness of 250 microns, and the intermediate layer is a mixed resin layer of polypropylene, polyethylene, and talc with a thickness of 1°35 mm. To explain the case of extrusion molding a three-layer laminated sheet for vacuum forming, the back layer is made of polypropylene with a wall thickness of 20 microns and serves as an adhesive layer to the urethane foam. The die joint 2 feeds the feed block 4 to the intermediate layer flow path 17, and the distribution passes through the intermediate layer resin flow path 12 of the piece 8, the intermediate layer flow path 17 feeds the sheet forming path 17a, and the extruder 5 feeds the molten polypropylene. The pyrene resin passes through the flow path 16 of the die joint 6, and the laminate resin introduction hole 15 is introduced into the introduction path 1.
3A, and branch paths 13B and 13C from the introduction path 13A.
The resin distributed to the nest 1 and sent to the branch path 13B is
The fat is sent to the sheet forming path 20a through the arcuate groove 14c of No. 4, and is sent to the branch path 13G.
1a, the back layer forming resin from the sheet/forming path 20a is laminated on the upper side of the intermediate layer forming molten resin in the sheet forming path 17a, and the surface layer forming resin from the sheet forming path 21a is layered on the lower side. are laminated, and from the discharge end of the flow path 3a of the die 3, a three-layer sheet consisting of an intermediate layer, a back layer and a surface layer having different wall thicknesses is extruded.

The resin passing through the arcuate groove portion 14c of the nest 14 smoothly advances from the reduced curved surface portion 140 at the end to the arcuate groove portion 1/IC, and smoothly advances from the arcuate groove portion 14c to the flow path 20 via the diffusion curved surface portion 14f, forming a turbulent flow. Never.

In this case, in order to form a desired surface layer that is thinner than the thickness of the surface layer, the nest 14 was fitted into the branch path 13B to form a three-layer sheet, but the arcuate groove 14c of the nest 14
Prepare several nests with different cross-sectional areas, and select the desired Y4
The required layer thickness can be 1q by fitting a nest of arcuate grooves with a cross-sectional area corresponding to the thickness into the branch passage.

(Effects of the invention) The same extrusion is used when the resin supplied is laminated on the intermediate layer with different thicknesses on the surface, or when producing a laminate with four or five layers. When J8 is to be laminated on another hard resin layer as an intervening layer, coextrusion molding can be carried out in a similar manner by appropriately selecting a nest using the apparatus of the present invention and fitting it into the branch path.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the main part of the device of the present invention, Fig. 2 is a slope view of the main part, Fig. 3 is a front view of the pieces for distribution, Fig. 4 is a right side view of Fig. 3, and Fig. 5 The distribution is the top view of the piece, Figure 6 is the top view of the nest, Figure 7 is the same partially cutaway side view, Figure 8 is the same bottom view, Figure 9 is the same left end view, Figure 10 is the same. The figure is a left end view of the same, and FIG. 11 is a sectional view taken along the line XI-XII in FIG. 6. 1.5... Extrusion 11.2.6... Gooigi] India, 3... Die, 4... Feed block, 7...
Block body, 8... Laminate resin distribution is piece, 9...
...Mounting hole, 11...Insert part, 12...Middle layer resin channel, 13...Distribution path, 13B, 13G...
Branch path, 14... nest for thickness adjustment. Patent applicant: Mitsubishi Oil & Chemical Co., Ltd. Fig. 2.6; Figure 9 Half to figure $tI solid

Claims (1)

[Scope of Claims] [I] A feed block provided between a die joint and a die having an intermediate layer resin passage, a block body and
A laminate resin distribution piece is formed that can be fitted and removed into the mounting hole of the block body, and a replaceable thickness adjustment nest is set in a branch path of the laminate resin distribution path formed in the insertion portion of the laminate resin distribution piece. A coextrusion resin laminate forming apparatus characterized by: [II] The thickness adjusting insert is formed by forming a continuous arcuate groove path consisting of a reduced curved surface portion at one end, an arcuate groove portion, and a diffusion curved surface portion at the other end. The coextrusion resin laminate forming apparatus according to item 1.