JPS60201924A - Extrusion molding method in extruder and device thereof - Google Patents

Abstract

PURPOSE:To obtain extrusion molded shapes, sectional shapes thereof partially differ, to each other by forming one part of a flow path by an elastic film and molding a material while the quantity of elastic deformation is altered by the pressure change of an internal filled fluid in an extruder for confectionary, etc. CONSTITUTION:A material extruded by the revolution of a screw 3 has a circular section in a flow path 4a, and reaches to a flow path 8b for a throttle valve 8 consisting of an elastic film. A fluid is fed into a sealing chamber 8c for the throttle valve 8 from a fluid injection path 10 at that time, a top section 8a is deformed elastically by the change of the fluid pressure of the fluid, and the quantity of the elastic deformation is controlled. Accordingly, an extrusion molded shape A partially throttles the flow path 8b when the flow path 8b is closed and opened to its full width, and an extrusion molded shape 13 is obtained when the full opening and the partial throttling of the flow path 8b are repeated and the flow path 8b is closed.

Description

Detailed Description of the Invention [Technical Field] The present invention relates to an extruder used for foods such as confectionery or processed foods, or for molding plastics or light metals, etc. The present invention relates to an extrusion molding method using an extruder for obtaining extruded products having different cross-sectional shapes in different directions, and an apparatus therefor.

(Prior art) Conventionally, a molding die is attached to the tip of an extruder, and in the extrusion molded product obtained by this, the cross-sectional shape in the direction substantially perpendicular to the extrusion direction is the same everywhere (
The problem is that it is not possible to obtain a single extrusion molded product with partially different cross-sectional shapes.

[Purpose of the invention]

An object of the present invention is to solve the above-mentioned conventional problems, and to obtain an extruded product having a partially different cross-sectional shape in a direction substantially perpendicular to the extrusion direction, while using a conventional extruder. Our goal is to provide manufacturing technology.

[Structure of the invention]

In order to achieve the above object, the extrusion molding method using an extruder Kb according to the present invention is an extruder that molds a material by extruding the material under pressure through the flow path, in which at least a part of the flow path is formed with an elastic film, The material is molded while changing the amount of elastic deformation of the elastic film in a direction substantially perpendicular to the extrusion direction of the material by changing the pressure of the fluid filled in the elastic film.

In addition, the extrusion molding apparatus according to the present invention includes a base body having a flow path therein, and a throttle valve formed of an elastic film and having a substantially general cross-sectional shape, the top of which faces at least a portion of the flow path. , and a sealed chamber for fluid injection provided at the base of the throttle valve.

[Explanation of Examples]

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

FIG. 1 is a longitudinal sectional view showing a first implementation device of the present invention.

In the figure, 1 is a sleeve, 2 is a cylinder provided within the sleeve 1, and a screw 3 is rotatably provided inside the cylinder 2.

The screw 3 has fins 3a, and as the screw 3 rotates, materials (in this embodiment, sausages and confectionery materials) supplied from a hopper (not shown) are transferred to the fins 3a.
Knead and extrude under pressure.

4I/i die, and the die 4 is connected to the flange 5 and the sleeve 1. Also, the die 4 is connected to the screw 3
The extruded material is preformed into a uniform cross-sectional shape, and has a flow path 4a through which the material passes backward, and a male thread 41) is carved in the outer peripheral portion on the downstream side of the flow path 4a. It is screwed into a female thread in the sealing flange 6. This sealing flange 6 is connected to the flange portion 7a of the presser sleeve 7 and the bolts.
They are connected by threaded nuts, etc.

Reference numeral 8 denotes a throttle valve made of an elastic film and having a roughly cylindrical cross-sectional shape, and its circumferential apex 8a is sandwiched and positioned between a pair of base bodies 9, and the base body 9 directs a flow having the same diameter as the southward flow path 9a. Road 8
It defines b. On the other hand, both end portions are engaged with flange portions 9b, 9b of a pair of base bodies 9, respectively, and the retaining portions thereof are pressed by a presser sleeve 7. Throttle valve 8
A sealed chamber 8C for fluid injection is defined by the throttle valve 8 and the presser sleeve 7 at the base of the pump. This sealed chamber 8C surrounds the circumference and communicates with the fluid injection path 1o. The throttle valve 8 is preferably made of silicone rubber, fluorine, epichlorohydrin rubber, acrylic rubber, etc., which have appropriate elasticity, strength, heat resistance, and cold resistance as a whole.

The mixed wire material pushed out by the rotation of the screw 3 is formed into a circular cross-section in the square flow path 4a, and then flows into the flow path 8b of the throttle valve 8.
ni face su-to and 〒prone body suuori n? M: ``Put your body in a sealed room 8c.''
The throttle valve 8 is operated by changing the fluid pressure. As this fluid pressure is increased, the top portion 8a of the throttle valve 8 bulges out toward the center of the flow path 8b, thereby squeezing the extruded material and giving it an I-shaped outer shape. Conversely, when the fluid pressure is lowered, the top portion 8a contracts, thereby increasing the outer diameter of the extruded material. In this way, by controlling the level of fluid pressure, the extrusion molded product A shown in FIG. 4 is produced.

B, etc. can be made -Qj''.The extrusion molded product A can be produced by closing the flow path 8b by expanding the armpit valve 8 and then fully opening it by contracting it. During the above operations, the extruded product must be slowly expanded and opened to actively give it its external shape.Please note that the extruded product must be separated into individual extruded products. is one aspect of the molding process.In the above-mentioned apparatus, the time interval between the closing/fully opening operation and the next closing/fully opening operation is 4. You can change your appearance freely.

Next, FIG. 2(a) is a longitudinal cross-section showing the second implementation device of the present invention.
5 is a sectional view. In addition, Fig. 2 (a) is a in Fig. 2).
It is a sectional view taken along the -a line. Components that are the same as those of the first embodiment shown in FIG. 1 are given the same reference numerals, and their explanations will be omitted.

In the second embodiment, a device is shown in which a material is formed into a cylindrical shape and then separated, and a support portion 20a of a hollow rod 20 is located between a die 4 and a base 9. As shown in FIG. 2(b), the support portion 20H of the hollow rod 20 has a fan-shaped through hole located radially with respect to the axis, and through this through hole 21, The material is extruded into the downstream channel 9a.

Thereafter, the hollow rod 20 forms the material into a cylindrical cross-section until it reaches the channel 8b. This second implementation device also expands the flow path 8b by expanding the top portion 8a of the throttle valve 80 in a direction substantially perpendicular to the extrusion direction f of the material passing through the flow path 8b, or by contracting the flow path 8b. It gives an outer shape to a cylindrical material. The rounding of the extrusion molded product is carried out by pressing the top portion 8a against the outer periphery of the hollow rod 20.

In addition, extrusion molded products C and D as shown in FIG. 4, for example, are manufactured from the second implementation apparatus.

FIG. 3 is a longitudinal sectional view showing a third implementation device of the present invention,
In this implementation device, other materials (e.g. chocolate, cream) are placed inside the cylindrical molded product.

30 is a hollow cylindrical member, and the supporting part 31 between the die 4 and the base 9 has a
The hollow cylindrical member 30 is fixed. The hollow cylindrical member 30 has a flow path 30a, and a flow path 31a is formed in the support portion 31, and the material I passing through the flow path f313 is formed in these.
The ivy material (2), which is different from the above, is supplied under pressure from an external supply path 32. in this case.

After supplying the different materials (1) under pressure from the external supply channel 32, the throttle valve 8 operates in the same manner as in the second embodiment.

In each of the above embodiments, the throttle valve 8#i is formed in an annular shape, and the top part expands or contracts due to the pressure of the fluid supplied from the base, and the circular flow path 8b expands or expands in diameter. It is configured to reduce in diameter. However, when the molded product is in the form of a sheet, the throttle valve 8 does not necessarily have to be formed in an annular shape, and may be formed only in the upper or lower part.

In this case, a bellows or the like may be used as the throttle valve. As a sheet-like extrusion molded product, for example, Fig. 4E
You will get something like this.

〔Effect of the invention〕

As explained above, the present invention has the following effects.

(2) Using an extruder, it is possible to obtain extruded products having appropriately different cross-sectional shapes in a direction substantially perpendicular to the extrusion direction.

(2) After imparting the cross-sectional shape, the extrusion molded product can be separated without having to excessively increase the aperture due to elastic deformation, and there is no need for a cutting device for the extrusion molded product, which was conventionally provided separately.

(2) To the material: By changing t and the separation time interval, the length of the extruded product can be changed freely.

In particular, the present invention is excellent in the production of short extrusion molded products, since only a small amount of deformation is required after molding and separation.

[Brief explanation of the drawing]

Figure at1 is a longitudinal sectional view showing the first implementation device of the present invention, j1
'J Figure 2 (a) is a longitudinal cross-sectional view showing the second implementation device of the present invention, t-1> Figure 2) is a cross-sectional view taken along line bb of Figure 2 (a), and Figure 3 is a cross-sectional view showing the second embodiment of the present invention. FIG. 4 is a longitudinal cross-sectional view showing the implementation device of the third embodiment of the present invention, and FIG. 4 is a diagram showing various extrusion molded products manufactured by each implementation device of the present invention. 1...Sleeve 2...Cylinder 3...Screw 3a...Fin 4...Die
4a, 8b, 9a, 30a, 31a...Flow path 5...
・Flange 6・・・Sealing flange 7・・Press sleeve 8・・Leveling valve 8a・・Top part 8C・・Sealed chamber for fluid injection 9・・Die adapter 9b・・・Flange part 10・... Fluid injection path 20 ... Hollow frame 20a
, 31... Support part 21... Through hole 30... Hollow cylindrical member 32... External supply paths A, B, C, D, E...
・Special applicant for extrusion molded products: Ikegai Iron Works Co., Ltd. Kowa Kogyo Co., Ltd. Figure 1 Figure 2 (0) (b) Figure 3 Figure 4

Claims (2)

[Claims] (1) In an extruder that molds a material by extruding it from a flow channel under pressure, at least a portion of the flow channel is formed with an elastic film, and the pressure change of the fluid filled in this elastic film is controlled as follows. Therefore, an extrusion molding method using an extruder characterized in that the material is molded while changing the elastic deformation Ii4 of the elastic coating in a direction substantially perpendicular to the extrusion direction of the material. (2) A throttle valve having a base body having a flow path therein and an elastic film having a roughly cylindrical cross-sectional shape, the top of which faces at least a part of the base body of the throttle valve; 1. An extrusion molding device including an extruder, comprising a closed chamber for fluid injection.