JPH045017A - Solidifying extrusion forming device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a solidification extrusion molding device, and more specifically, it is capable of simultaneously molding a plurality of plate-shaped products in the horizontal direction using one extruder and one former. The present invention relates to a solidification extrusion molding device that can be used for solidification and extrusion molding.

(Prior art and its problems) Conventionally, there has been no known solidification extrusion molding apparatus that melts and extrudes a thermoplastic synthetic resin, particularly a crystalline resin such as polypropylene or nylon, and then shapes the molten softened resin into a predetermined shape using a former under back pressure. However, with this equipment, one former is usually used to extrude one molded product, and in order to mold multiple molded products at the same time, one extruder must have multiple upper and lower formers. Methods such as attaching and molding the product, or extrusion molding and then cutting it to a predetermined size and width to make multiple products were adopted.

However, the former method requires multiple collection devices including formers, which complicates the entire device, complicates operation, and increases equipment costs. Since a cutting process is added later, there is a problem in that the processing cost increases.

(Means for Solving the Problems) The present invention is a method for solving the above problems, and its gist is that while applying back pressure to the crystalline synthetic resin melted and discharged from an extruder, A molding device for solidification, in which a plurality of horizontally branching branch passages are formed in the mouthpiece of an extruder, and a former connected to the mouthpiece has a plurality of branch passages communicating with each of the branching passages. This solidification extrusion molding apparatus is characterized in that each of the outflow holes faces a domestic demand section developed in a horizontal plate shape, and a flow dividing protrusion is formed between each of the outflow holes.

Embodiments of the present invention will be specifically described below with reference to the drawings.

FIG. 1 shows a solidification extrusion molding apparatus of the present invention in a side view, and FIG. 2 is a perspective plan view for explaining essential parts of an embodiment of the present invention.

As shown in a side view in FIG. 1, the present invention includes a die 2 connected to an extruder 1 via an adapter 11, and the die 2 is arranged perpendicularly to the extrusion direction to control the temperature of first blocks 31 to 31.
It is connected to the former 3 consisting of a fourth block 34, and at the rear of the fourth block 34 of the former 3 is a take-off I for braking and take-off for applying back pressure.
! 14 are arranged.

The gist of the present invention lies in the internal structure between the base 2 and the first block 31 of the former 3.

That is, as shown in a perspective plan view in FIG.
A cap 2 and a former 3 are connected to the tip of the cap 11 via an adapter 11, and a branch flow path 22.22 is formed inside the cap 2 and branches from the branch point 21 in the left and right horizontal directions, and is connected to the cap 2. In the first block 31 at the tip of the former 3, there is an outflow hole 31' communicating with the branch flow path 22, 22.
, 31' are formed into internal demand portions B and B, which extend horizontally into plate shapes.

And the middle between the internal demand parts B, B, that is, the outflow hole 31',
A flow dividing protrusion 31'' is formed in the center between 31'.

In the above embodiment, the branch flow path 2 is symmetrically formed from the branch point 21.
2, and the outflow hole 31' is 1/4 of the width interval of the internal part B.
In the above example, two plate-like molded products of the same size can be obtained by forming the branching channel 22 at the position shown in FIG. Molded products A' having different width dimensions can also be molded at the same time.

Further, in the above embodiment, two branch channels 22 are provided, two outlet holes 31' communicating with the branch channels 22 are provided, and one branch protrusion 31'' is formed in the middle. It is also possible to have three branch channels 22, three outlet holes 31', and two branch protrusions 31'' each in the middle of the outlet holes 31'. There may be.

The first block 31 to the fourth block 3 of the former 3
4, as shown in FIG. 1, the upper mold 311 and the lower mold 312 are assembled by fastening with a fastening tool 314 via a side plate 313, and the upper mold 311 is fastened in the width direction and longitudinal direction. The direction is reinforced with a reinforcing plate 35, and the upper mold 311
A plurality of through holes 315 are formed in each of the lower molds 312 in the width direction, that is, in a direction orthogonal to the extrusion direction, so that a heating medium or a cooling medium can pass therethrough.

The number of blocks in the former 3 is not limited to the above-mentioned four blocks, and can be changed as necessary.

When solidification extrusion is performed using the apparatus of the present invention, extrusion 1! I
The molten resin A kneaded by f is narrowed through the adapter 11, introduced into the mouthpiece 2, branched from the branch point 21 in the left and right horizontal directions, and flows through the outflow holes 31' in the first block 31 of the former 3, The molten resins A and A flow out from 31' to the domestic parts B and B, respectively, and are expanded in the directions of the arrows, but the molten resins A and A that collide with each other at the tips of the flow dividing protrusions 31'' flow along the flow dividing interface C without intersecting with each other. The molded product A' is shaped while being subjected to back pressure in the steps up to the second block 32, cooled in the cooling zone after the third block 33, and taken off by the take-off machine 4.

The obtained molded product A' is the flow dividing protrusion 31 in the former 3.
It is collected in a state that is already divided at the tip of the ``, or in a nearly divided state with a thin skin.

This state occurs because the molten resin that has flowed out from the branch channels 22 and 22 into the inner cavities B and B of the former 3 is developed in a delta shape around the outflow hole 31', and
It is assumed that this is because the solidification and shrinkage phenomenon peculiar to the solidifying resin occurs at the tip of the diversion protrusion 31'', so that the resins are cooled and solidified at the diversion interface C without changing each other and are taken off.

<Effect of the invention) Since the present invention has the above configuration, it has the following effects.

That is, the present invention uses a thermoplastic synthetic resin, especially a crystalline resin.
The basic extruder is a molding device that can form multiple plate-shaped molded products in the horizontal direction using one former, and if the device of the present invention is used, it is possible to The respective flows of molten resin are divided by the flow dividing protrusions provided in the former, and are cooled and solidified along the flow dividing interface without intersecting with each other. It is possible to simultaneously mold plate-shaped molded products with different width dimensions, or plate-shaped molded products with different width dimensions,
Moreover, since the structure of the molding device is simple and the molding operation is easy, it has the effect of greatly reducing manufacturing costs and contributing to improving production efficiency.

[Brief explanation of drawings]

FIG. 1 shows a solidification extrusion molding apparatus of the present invention in a side view, and FIG. 2 is a perspective plan view for explaining essential parts of an embodiment of the present invention. 1... Extruder, 21... Branch point, 3... Former, 31'... Outflow hole, A... Molten resin, B...Internal cavity part, 2...Cap, 22...Branch flow path, 31...First block, 31''... Diversion protrusion, A'... Molded product, C... Diversion interface

Claims (1)

[Claims] A molding device that shapes and solidifies crystalline synthetic resin in a former while applying back pressure to the crystalline synthetic resin that is melted and discharged from an extruder, and the extruder mouthpiece has multiple branch channels that branch horizontally. The former connected to the mouthpiece has outflow holes communicating with each of the branch flow paths facing the inner cavity developed in the form of a horizontal plate, and a diversion protrusion is formed between each of the outflow holes. A solidification extrusion molding device characterized by: