JP2725723B2 - Filler for plastics and method for producing the same - Google Patents

Description

The present invention relates to a plastic molding material comprising a plastic substrate and a filler (filler), and a plastic filler mixed into the plastic substrate and a method for producing the same. About.

[Prior Art] As is known, plastic molded products are also applied to precision mechanical components. When such precision mechanical components are molded from plastic materials, the mechanical strength and dimensional accuracy of the molded products are improved. In order to achieve this, a plastic molding material obtained by adding a filler to a plastic substrate is generally used. As the shape of the filler, a fiber (straight) material and a flake (flake) material are mainly used. However, fibrous fillers have the drawback that shape accuracy is degraded due to shrinkage anisotropy caused by filler orientation during molding.Although flake-like fillers have improved shrinkage anisotropy, the weldability of molded products There is a disadvantage that the strength of the portion is deteriorated.

Therefore, in order to solve the problems in the plastic molding material to which the filler is added as described above, a plastic molding material to which a filler having a linear shape in a two-dimensional or three-dimensional direction is added has been developed. Such a molding material is disclosed in JP-A-55-73737.

[Problems to be Solved by the Invention] In the technique of Japanese Patent Application Laid-Open No. 55-73737, the manufacturing method is to manufacture a filler by intersecting linear fibers and fusing or bonding the intersections. Therefore, when mass-producing industrially, there is a problem that productivity is lacking, and since a specific mechanism and means relating to the manufacturing process are not disclosed, there is a disadvantage that it lacks specific feasibility. .

The present invention has been made in view of the above-mentioned problems of the prior art, and improves the shrinkage anisotropy of a plastic molded article.
Also, a plastic filler capable of improving the mechanical strength of a weld portion, a plastic filler capable of producing the filler specifically stably with high productivity, and a method for producing the same are provided. The purpose is to:

[Means for Solving the Problems] In the present invention, in a filler to be mixed into a plastic molding material, a rectangular thin piece is formed in a twisted shape.

Further, in the method for producing a filler according to the present invention, the molten base material is formed into a sheet material having a constant width and a constant thickness by cooling after passing through a roller, and thereafter, the sheet material is formed into a fixed length. Then, one end of the sheet material is fixed, and then the sheet material is heated and softened, and the other end of the sheet material is rotated to form a twisted shape. Is cut into small pieces.

[Operation] According to the above-described production method, a plastic filler having a twisted flat surface can be produced stably and with high productivity.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

(First Embodiment) FIG. 1 is a structural explanatory view showing a first embodiment of a manufacturing apparatus 1 for manufacturing one embodiment of a plastic filler according to the present invention. The section is a cross section. In the present embodiment, the case where glass is used as the material of the filler is illustrated.

In the drawing, reference numeral 2 denotes a melting furnace disposed on the left end side of the apparatus, and contains a molten glass 3 as a melting base material.
Reference numeral 4 denotes a supply port for continuously supplying the molten glass 3. A pair of rollers 7 for forming the molten glass 3 discharged from the discharge port 5 into a sheet-like filler material 6 having a constant width and a constant thickness is disposed at the discharge port 5 of the melting furnace 2. is there. The roller 7 is a sheet-like filler material 6
Is configured to be restricted and set to a constant width.

On the right side of the roller 7, a cooling tank 11 having an inlet 8 and an outlet 9 and having a transfer roller 10 provided therein is disposed, and circulates the sheet-like filler material 6 transferred through the roller 10. It is configured so that it can be cooled by air or the like. Near the outlet 9 of the cooling tank 11, a pair of cutting cutters 12 are provided, and the cutters 12 are configured to be vertically movable. Note that a plurality of transport rollers 10 are provided along the transport direction.

A rotary chuck arm unit equipped with a chuck unit 13 capable of gripping the sheet-like filler material 6 conveyed via the rollers 10 is provided in front of the cutter 12 in the conveying direction (right side in the figure).
14 are arranged. A rotary chuck arm unit 14, a rotary shaft 15 rotatably driven via a drive device (not shown), and a chuck arm fixedly provided at a position on the circumference of the rotary shaft 15, which is equally spaced around the circumference 4. 16 and a chuck unit 13 provided at the tip of the chuck arm 16. The chuck unit 13 is configured to be capable of opening and closing freely.

Above the rotary chuck arm 14, a heating unit 17 and a sheet-like filler material 6 in cooperation with the rotary chuck arm 14 are provided.
A processing unit 18 for processing and forming a twisted shape (spiral shape) is provided. The heating unit 17 is composed of a heater 19 which is divided and arranged in two with the plane of the drawing as a plane of symmetry. Each heater 19 is configured to be openable and closable in a direction perpendicular to the paper surface. The machining section 18 includes a motor 20 and
The chuck unit 22 includes a chuck unit 22 mounted on a drive shaft 21 of a motor 20. The chuck unit 22 includes a rotary chuck arm unit.
The other end (upper end) of the sheet-like filler material 6 gripped by the chuck 13 on the 14 side is configured to be grippable and openable. The work forming section 18 is configured to be vertically movable via a driving device (not shown).

On the right side of the rotary chuck arm 14, a formed product cutter 30 for cutting the formed product 6a having a twist shape formed by the processing unit 18 into small pieces is provided. The formed product cutter 30 is constituted by a pair of cutters movable in a direction perpendicular to the paper surface, and the cutter on the front side of the paper surface is omitted in the drawing.

Below the cutter 30 of the formed product, a collection box 32 of the cut and twisted filler 31 is provided.

Next, a method of manufacturing the charging material for plastics 31 using the device 1 will be described.

First, the molten glass 3 is discharged from the discharge port 5 of the melting furnace 2, and the discharged molten glass 3 is formed by a roller 7 into a filler material 6 on a sheet having a constant width and a constant thickness.

Next, the sheet-shaped filler material 6 is carried into the cooling tank 11 to be cooled and solidified, and the cooled and solidified sheet-shaped filler material 6 is transferred toward the rotary chuck arm 14.

Chuck section with the leading end of sheet-like filler material 6 open
At the time when the transfer roller 10 is loaded, the chuck 13 is closed, and the rotation of the transfer roller 10 is stopped. At the same time, the sheet-like filler material 6 is cut into a predetermined length by the cutter 12.

Next, the rotating shaft 15 is rotated clockwise by 90 ° to move the sheet-like filler material 6 gripped by the chuck portion 13 to a vertically upper position. Then, after closing the heater 19 which has been opened in advance, the work forming portion 18 is moved downward, and the upper end portion of the sheet-shaped filler material 6 is gripped by the chuck portion 22. Then, after the sheet-shaped filler material 6 is heated and softened via the heater 19, the motor 20 is rotated to form the sheet-shaped filler material 6 into a twisted (spiral) formed product 6a.
It is processed and formed.

Next, after stopping the motor 20 and opening the chuck portion 22, the work forming portion 18 is moved upward and the heater
19 is opened.

Thereafter, the rotating shaft 15 is rotated clockwise by 90 °, and the twisted formed product 6 a is cut into small pieces of the filler 31 by the pair of formed product cutters 30. The filling material 31 has a shape whose plane is twisted as shown in FIGS.

 The cut filler material 31 is collected in the collection box 32.

If molding is performed by mixing the filler 31 of the present example into a plastic base material, since the shape does not have a strong direction control like a fiber, the shrinkage of the molded product may have partial anisotropy. However, the shape accuracy such as roundness and parallelism is improved.
Also, the lamination of the weld portion is hindered due to the twisted shape, so that a plastic molded product whose strength does not decrease can be obtained. Moreover, according to such a method and apparatus,
Simple equipment and continuous filling in a series of systems
Since 31 can be manufactured, there is an advantage that it can be manufactured stably and with high productivity.

Second Embodiment FIG. 3 shows a second embodiment of the present invention. This embodiment also illustrates a case where glass is used as the filler.

In the drawing, reference numeral 40 denotes a melting furnace containing a molten glass 41, which is rotatably supported by an opening 44 of a support plate 43 via a bearing 42. A hydraulic cylinder 45 is fixedly mounted on the upper part of the melting furnace 40, and a compression plate 47 disposed in the melting furnace 40 is connected to a tip of the piston rod 46.

A motor 48 is fixed on the support plate 43, and a belt (endless belt) 51 such as a flat belt is provided between a pulley 50 fixed to a drive shaft 49 of the motor 48 and the outer peripheral surface of the melting furnace 40. Is wound.

At the lower part of the melting furnace 40, an outlet 52 is opened.
52 is formed in a rectangular shape as shown in FIG. At a position close to and below the discharge port 52, a cutter slit 54 having an opening 53 of the same shape corresponding to the discharge port 52 is provided,
The cutter slit 54 is configured to be movable in the direction of the arrow via a drive unit 55 supported by the melting furnace 40.

Below the cutter slit 54, a plurality of blowers (compressed air blowing portions) 60 are provided, and the blowers 60 are provided, for example, above a collection box 61. Each blower 60 is connected to a compressor 62.

Next, a method of manufacturing the filler 31 using the above-described apparatus 1 will be described.

First, the compression plate 47 is moved downward through the hydraulic cylinder 45 to compress the molten glass 41, and the molten glass 41 is discharged from the outlet 52,
It is discharged downward through the cutter slit opening 53.

Since the discharged molten glass 41 flows freely in a liquid state, the molten glass 41 is twisted with the rotation of the melting furnace 40 as shown in FIGS. The twisted molten glass 41a is cut by moving the cutter slit 54 as shown in FIG. 5D.

Then, compressed air from the blower 60 is blown against the cut twisted molten glass 41a to be cooled, thereby forming the filler 31 having the twisted shape fixed. Filling material 31
As shown in FIGS. 2a and 2b, the plane is formed in a twisted shape as in the first embodiment.

 The falling filler material 31 is collected in the collection box 61.

In this embodiment, the same effects as in the first embodiment can be obtained.

In the above two embodiments, the base material of the filler is described as glass, but other resins or metals that do not soften at the molding temperature at which the plastic base material (thermoplastic resin) is melted can also be used. It is.

[Effects of the Invention] As described above, according to the present invention, with respect to the shape accuracy of a plastic molded product and the strength of a weld portion, since the filler shape is a twisted plane, local contraction of molding shrinkage is prevented, In the weld portion, a plastic molded product having high shape accuracy and stable strength can be obtained in order to prevent lamination. And the filler which has such excellent functions can be manufactured stably and with high productivity.

[Brief description of the drawings]

FIG. 1 is a configuration explanatory view showing a first embodiment of an apparatus for producing a filler for plastics of the present invention, FIGS. 2a and 2b are perspective views showing one embodiment of a filler according to the present invention, FIG. 1 is a cross-sectional explanatory view showing a second embodiment of the plastic filler manufacturing apparatus of the present invention, FIG. 4 is an enlarged view of a main part in FIG. 3, FIG. FIG. 4 is an explanatory diagram of an operation state of a main part of FIG. 3; 2 ... Melting furnace 3 ... Molten glass 6 ... Sheet-like filler material 7 ... Roller 11 ... Cooling tank 12 ... Cutter 14 ... Rotating chuck arm section 17 ... Heating section 18 ... Process forming section 30 …… Formed product cutter

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification number Office reference number FI Technical indication location C08K 7/00 B29C 67/16

Claims (2)

(57) [Claims] A filler for mixing into a plastic molding material, wherein a rectangular thin piece is formed in a twisted shape. 2. A sheet material having a fixed width and a fixed thickness is formed by cooling the molten base material after passing through a roller, and thereafter, the sheet material is cut into a fixed length and then cut into a predetermined length. One end is fixed, and then the sheet material is heated and softened, and the other end of the sheet material is rotated to form a twisted shape.After that, the twisted formed body is cut into small pieces. Characteristic method for producing plastic filler.