JP2001170938A - Weighing device for granular resin molding material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a weighing device for a granular resin molding material which supplies the granular resin molding material to a resin molding device and is smoothly operated in its rotor rotating motion, despite its repeated weighing use. SOLUTION: This weighing device is equipped with a case 2 having a circular cavity 3 as viewed at its section, a columnar rotor 6 having an outer peripheral face 4 which fits to the inner peripheral face of the circular cavity 3 and a weighing hole 5 opened in the outer peripheral face 4 and a weighing plunger which is freely slidable along the inner wall of the weighing hole 5. Further the weighing device is a device for supplying the granular resin molding material to the resin molding device by rotation of the columnar rotor 6 around a shaft 10 after storing a specified amount of the granular resin molding material in the weighing hole 5. Besides, a stepped groove 13 formed circling the outer peripheral face completely is provided on the outer peripheral face 4 of the rotor 6 and an opening of the weighing hole 5 is formed at the bottom of the stepped groove 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measuring device for a powdery resin molding material used in a resin molding apparatus for performing transfer molding.

[0002]

2. Description of the Related Art There is known a resin molding apparatus for performing transfer molding using a resin molding material such as an epoxy resin sealing material having a powdery shape in sealing an electronic component. From the viewpoint of efficiently measuring the resin molding material and supplying it to the resin molding device, a measuring device as shown in FIGS. 4 and 5 is used. FIG. 4 (a) is a perspective view of a case of the measuring instrument,
(B) is a perspective view of the rotor, and FIG. 5 is a cross-sectional view showing the operation of the measuring device. The measuring device is for measuring a predetermined amount of the powdery resin molding material 1 supplied from the hopper. The measuring device includes a case 32 having a circular cavity 31 in a cross-sectional view, an outer peripheral surface 33 adapted to an inner peripheral surface 40 of the circular cavity 31, and a cylindrical rotor 35 having a measuring hole 34 opened in the outer peripheral surface 33. A measuring plunger 36 slidable along the inner wall of the measuring hole 34; and means (not shown) for adjusting the position of the measuring plunger 36 in the measuring hole 34. The case 32 has a first through-hole 37 communicating between the circular cavity 31 and the upper surface of the case.
And a second communicating between the circular cavity 31 and the lower surface of the case.
It has a through hole 38. In the measuring device, the resin molding material 1 is supplied to the first through hole 37 from a hopper. The cylindrical rotor 35 has a cylindrical shape between a first position where the measuring hole 34 matches the first through hole 37 and a second position where the measuring hole 34 matches the second through hole 38. The rotor 35 is rotatably supported around an axis 41. The powdery and granular resin molding material 1 supplied to the measuring hole 34 via the first through hole 37 at the first position is rotated by the columnar rotor 35 and moved to the second position, so that the second through hole is formed. It is sent to the supply section 39 of the resin molding apparatus via the hole 38. At this time, in order to smoothly rotate the cylindrical rotor 35, the inner peripheral surface 40 of the circular cavity 31 of the case 32 and the outer peripheral surface 3 of the cylindrical rotor 35 are formed.
3 is formed to about 0.02 mm.

[0003]

However, when weighing is repeatedly performed, the weighing device is moved to the inner peripheral surface 4 of the circular cavity 31.
0 and the clearance between the outer peripheral surface 33 of the rotor 35,
Fine powder of resin molding material 1, for example, having a particle size of 0.01 mm
Some of them adhere. This fine powder has static electricity,
Since it is difficult to drop the scale, the rotating resistance of the rotor 35 of the weighing machine increases, and the weighing machine may be difficult to move.

The present invention has been made in view of the above circumstances, and an object thereof is to allow a cylindrical rotor to rotate about an axis after a predetermined amount of a powdery resin molding material is accommodated in a measuring hole. By doing so, it is a measuring instrument for powdery resin molding material to supply the resin molding material to a resin molding device,
It is an object of the present invention to provide a measuring device of a powdery resin molding material in which the rotation operation of the rotor is smoothly performed even if the measurement is repeated.

[0005]

According to a first aspect of the present invention, there is provided a meter for a resin molding material in the form of a powder having a circular shape in cross section, an outer peripheral surface adapted to an inner peripheral surface of the circular cavity, and an outer periphery thereof. A cylindrical rotor having a metering hole opening in the surface,
A measuring plunger slidable along the inner wall of the measuring hole is provided. After a predetermined amount of a powdery resin molding material is accommodated in the measuring hole, the cylindrical rotor is rotated around an axis, and the resin In a measuring device of a powdery and granular resin molding material for supplying a molding material to a resin molding device, a step groove is provided on the outer peripheral surface of the rotor, and a step groove surrounding the outer peripheral surface is provided. An opening is formed. According to the above, since the step groove is provided, even if the fine powder of the resin molding material scatters without entering the measuring hole, because the clearance between the inner peripheral surface of the circular cavity and the bottom of the step groove is large, The fine powder does not adhere to the step grooves. Therefore, in the above-described measuring device, the rotating operation of the rotor is performed smoothly even when molding is repeated.

According to a second aspect of the present invention, there is provided a measuring device for a granular resin molding material, wherein the clearance between the inner peripheral surface of the circular cavity and the bottom of the step groove is provided. The width of the portion is 0.04 to 0.07 mm. As described above, the fine powder of the resin molding material having a particle size of about 0.01 mm does not adhere to the step grooves.

According to a third aspect of the present invention, there is provided a measuring device for a granular resin molding material according to the first or second aspect, wherein the granular resin molding material comprises:
It is an epoxy resin sealing material, wherein the granular material having a particle size of 0.1 to 5.0 mm is 99% by weight or more of the whole. As a result, the fine powder is less likely to adhere to the step grooves, and the rotating operation of the rotor is smoothly performed even if the molding is repeated.

[0008]

1 and 2 show an example of an embodiment corresponding to the measuring device for powdery and granular resin molding materials according to claims 1 to 3, and FIG. 1 (a) shows a case of the measuring device. Perspective view of the
FIG. 2B is a perspective view of the rotor, and FIG. 2 is a cross-sectional view showing the operation of the measuring device.

The above-mentioned measuring device measures a predetermined amount of the resin molding material 1 in the form of powder supplied from a hopper and supplies it to a resin molding device. The weighing device is housed in a case 2 having a circular cavity 3 in a cross-sectional view and the circular cavity 3,
A cylindrical rotor 6 having a measuring hole 5 opened on the outer peripheral surface 4
And a measuring plunger 7 slidable along the inner wall of the measuring hole 5. Further, the weighing device includes a screw 11 that protrudes from the outer peripheral surface 4 of the rotor 6 and adjusts the position of the weighing plunger 7 in the weighing hole 5. The case 2 has a first through hole 8 communicating between the circular cavity 3 and the upper surface of the case, and a second through hole 9 communicating between the circular cavity 3 and the lower surface of the case. Case 2 is
A longitudinal groove 12 is formed so that the screw 11 does not contact the case 2 when the rotor 6 rotates. In the measuring device, the resin molding material 1 is supplied to the first through hole 8 from a hopper. The cylindrical rotor 6 has a cylindrical shape between a first position where the measuring hole 5 and the first through hole 8 coincide with each other and a second position where the measuring hole 5 and the second through hole 9 coincide with each other. The rotor 6 is rotatably supported around an axis 10.

[0010] The measuring device comprises an outer peripheral surface 4 of the rotor 6.
Is provided with a step groove 13 surrounding the outer peripheral surface 4.
An opening of the measuring hole 5 is formed at the bottom of the step groove 13. The width of the clearance portion 15 between the inner peripheral surface 14 of the circular cavity 3 and the bottom of the step groove 13 is 0.04-0.
A range of 07 mm is suitable. The measuring device has a step groove 1
3 is provided, even if the fine powder of the resin molding material 1 (for example, having a particle size of about 0.01 mm) scatters without entering the measuring hole 5, the clearance portion 15 is large. The powder does not adhere to the step groove 13. Therefore, in the above-mentioned measuring device, the rotation operation of the rotor 6 is smoothly performed even if the molding is repeated.

[0011] The above-mentioned measuring device is measured as follows. The powdery resin molding material 1 supplied to the measuring hole 5 via the first through hole 8 at the first position is applied to the cylindrical rotor 6.
Is rotated and moved to the second position, and is sent to the supply unit 16 of the resin molding apparatus via the second through hole 9.

The shape of the cross section of the step groove 13 is as follows.
As shown in FIG. 3, (a) having a substantially right-angled step and a flat surface, (b) having a V-shaped inclined surface,
(C) may have a semicircular inclined surface,
As shown in FIG. 3D, a groove 13 a may be provided in addition to the step groove 13 having the opening of the measuring hole 5.

Examples of the powdery and granular resin molding material 1 measured by the measuring instrument include an epoxy resin sealing material, and among them, a granular material having a particle size of 0.1 to 5.0 mm is 99% in total. It is preferable that the amount is not less than weight%. The epoxy resin encapsulating material is composed of an epoxy resin such as an orthocresol novolak type or a biphenyl type, a curing agent such as a phenol novolak resin and a derivative thereof, an inorganic filler such as fused silica, and a release agent such as stearic acid. Prepared from a sealing composition. In addition, the composition may contain a curing accelerator, a surfactant, a silane coupling agent, a coloring agent, and a flame retardant as necessary.

The epoxy resin encapsulating material can be produced, for example, as follows. First, the sealing composition is kneaded to obtain a semi-cured product in a B-stage state, and the semi-cured product is pulverized to obtain a pulverized product having a diameter of 5 mm or less. The pulverized material includes a powder having a particle size of 0.1 to 5.0 mm and a fine powder having a particle size of less than 0.1 mm, and a sealing composition on the surface of the granules while continuously moving the granules By melting the resin component of the above, the fine powder is captured in the molten phase of the resin component, and then the epoxy resin sealing of the granular material coated with the resin layer capturing the fine powder by solidifying the molten phase is performed. A stopping material is obtained. As a result, 0.1 to 5.0 m
A resin layer is formed on the surface of the granular material having a particle size of m,
Fine powder having a particle size of less than 0.1 mm is captured in this resin layer. As a result, an epoxy resin encapsulating material having a particle size of 0.1 to 5.0 mm and not less than 99% by weight of the whole is obtained. In the epoxy resin sealing material, the fine powder is less likely to adhere to the step groove, and therefore, the rotating operation of the rotor of the measuring instrument is performed smoothly.

[0015]

According to the measuring device for powdery and granular resin molding materials according to the first to third aspects, the stepped groove is provided on the outer peripheral surface of the rotor, so that the fine powder of the resin molding material does not enter the measuring holes. The fine powder does not adhere to the step grooves because of the large clearance between the inner peripheral surface of the circular cavity and the bottom of the step grooves. Therefore, in the above-described measuring device, the rotating operation of the rotor is performed smoothly even when molding is repeated.

[Brief description of the drawings]

1 shows an example of an embodiment of the present invention, in which (a) is a perspective view of a case of a measuring instrument, and (b) is a perspective view of a rotor of the measuring instrument.

FIG. 2 is a cross-sectional view illustrating an example of the embodiment of the present invention and illustrating operation.

FIG. 3 is a cross-sectional view illustrating the shape of the cross section of the step groove.

4A and 4B show an example of the related art, in which FIG. 4A is a perspective view of a case of a measuring device, and FIG. 4B is a perspective view of a rotor of the measuring device.

FIG. 5 is a cross-sectional view showing an example of the related art and showing an operation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Resin molding material 2 Case 3 Circular cavity 4 Outer peripheral surface 5 Measuring hole 6 Rotor 7 Measuring plunger 13 Step groove 15 Clearance part

Claims (3)

[Claims] 1. A case having a circular cavity in a cross-sectional view, a cylindrical rotor having an outer peripheral surface conforming to the inner peripheral surface of the circular cavity and a measuring hole opened in the outer peripheral surface, and a cylindrical rotor having an inner wall of the measuring hole. A measuring plunger slidable along the housing, a predetermined amount of the powdered and granular resin molding material is accommodated in the measuring hole, and then the cylindrical molding rotor is rotated around an axis, thereby forming the resin molding material into a resin molding device. In the measuring device for the powdery and granular resin molding material supplied to the rotor, a step groove is provided around the outer peripheral surface of the rotor, and an opening of the measuring hole is formed at the bottom of the step groove. A measuring device for powdery and granular resin molding materials. 2. The powdery resin molding material according to claim 1, wherein the width of the clearance between the inner peripheral surface of the circular cavity and the bottom of the step groove is 0.04 to 0.07 mm. Meter. 3. The powder-granular resin molding material is an epoxy resin encapsulating material, and the granular material having a particle size of 0.1 to 5.0 mm is 99% by weight or more of the whole. The measuring device for a powdery and granular resin molding material according to claim 1 or 2.