JP2005262496A - Molding machine of flat plate-shaped resin - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a molding machine simple in structure, low in initial cost and running cost, having high mold releasability and reduced in damage ratio. <P>SOLUTION: In the molding machine 12 for holding the resin Po to be molded supplied into a molding part E by upper and lower molds (heat presses 24) to mold the same into a flat plate shape, the molding part E is equipped with a frame body 16 for forming the outer shape of a flat plate resin P, the elastomer sheet (first elastic sheet) 18 arranged to the upper part of the frame body 16 and deformable into the shape along the inside (through-hole 16A) of the frame body 16 and recoverable and a cover sheet (second elastic sheet) 20 capable of opening and closing the uppermost part of the molding part E. The resin Po to be molded is molded between the elastic sheet 18 and the cover sheet 20. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a flat resin molding apparatus suitable for being applied when a flat resin used as a supply material in compression molding or the like is molded.

  When a member requiring high accuracy, such as a semiconductor or an electronic component, is resin-sealed, a so-called flat resin is often used as a supply material. This flat resin is molded into a semi-cured thin flat plate by heating and pressing a granular thermosetting resin with a mold, and as a sealing material for sealing semiconductors etc. without variation Is preferred.

  However, since it is thin and its strength is not high, there is a problem that it is easily damaged by molding with a normal mold. As measures for solving this problem, a plate mold method, a method of interposing a release film on the upper and lower plane portions based on the plate mold method, and the like have been proposed (see Patent Document 1 and the like).

JP 2001-24014 A

  Although the plate molding method itself is a molding method in which the resin to be molded is not easily damaged, the thickness of the flat resin is, for example, only about 0.5 mm, and it is still difficult to avoid the occurrence of the damage. It is.

  In addition, the method of interposing a release film at the interface with the mold requires replacement of the film every time the flat resin is molded, which is likely to increase the cost. In addition, it is necessary to supply new film and collect used film. There is a problem that a film feeding mechanism for performing the operation is required and the apparatus becomes complicated.

  In some cases, the molding resin slightly squeezed from the inside of the frame to the release film side may trap the frame, and in this case, the mold release resistance increases and breaks down. There is also a problem that the probability of reaching is high.

  The present invention has been made to solve such a conventional problem, and has a simple structure, a low initial cost, a low running cost because it can be used repeatedly, a high releasability, and a resin. It is an object of the present invention to provide a resin molding apparatus that is less prone to problems due to squeezing out and that can maintain a low breakage rate.

  The present invention provides a resin molding apparatus that molds a molding resin supplied into a molding part by sandwiching the molding resin between upper and lower molds, and the molding part forms a frame for forming the outer diameter of the molding resin, A first elastic sheet that is arranged at the upper part of the frame, can be deformed into a shape along the inside of the frame, and can be restored; and a second elastic sheet that can open and close the uppermost part of the molded part The above-mentioned problem is solved by supplying the molding resin between the first elastic sheet and the second elastic sheet and performing molding.

  In the present invention, the resin to be molded is put between the first elastic sheet and the second elastic sheet. The charged resin is pressed toward the inner side (inner wall) of the frame by upper and lower molds. Thereby, since the first elastic sheet is deformed so as to follow the shape of the frame body, the resin to be molded is molded into the shape of the frame body. Since the frame has high rigidity, the variation in the shape of the molded product is small.

  On the other hand, since the resin to be molded is in contact with only the elastic sheet, the releasability is good, and stress can be concentrated on the peeling line by deforming the elastic sheet at the time of peeling. Therefore, the fragile flat resin can be taken out without being damaged.

  Further, since the resin to be molded is sandwiched between the first elastic sheet and the second elastic sheet, it is difficult to avoid by the conventional molding method using a release film. There is no risk that a trouble such as “adding a negative effect on the release property” will occur.

  Furthermore, since the elastic sheet can be restored and can be used repeatedly, the running cost can be reduced. Note that the “restoration” here does not necessarily require that the shape is completely restored to the original shape, and it is sufficient to return to the original shape to the extent that there is no hindrance to repeated use. Shall.

  Here, the first elastic sheet is preferably one in which a thin film having high releasability from the mold is attached to an elastic base material. Thereby, it is possible to obtain a first elastic sheet having higher releasability while having functions of predetermined deformation and restoration.

  Moreover, it is preferable that the 2nd elastic sheet is comprised with the thin metal plate. Thereby, the efficiency of heating and heat removal in the molding step can be increased, heat loss can be reduced, and molding cycle time can be shortened. Further, when peeling from the resin to be molded, stress can be concentrated on the peeling line by deformation of the metal plate, so that peeling can be performed with a light load.

  Furthermore, you may make it form a 1st elastic sheet and a 2nd elastic sheet by bending a single elastic base material. When configured in this manner, the position of the first elastic sheet and the second elastic sheet is not required when a flat resin formed by opening the second elastic sheet is taken out, without requiring additional components or mechanisms. A relationship can be maintained. Further, even when the first elastic sheet is deformed along the frame during molding, there is an advantage that the positional relationship between the first elastic sheet and the second elastic sheet is not easily broken. Furthermore, at least with respect to the folded side, there is no possibility that the resin to be molded spills out of the first elastic sheet and the second elastic sheet, so that the probability of occurrence of defective products can be further reduced. it can.

  The main object of molding of the present invention is a so-called “flat resin”, but it is not always required to be a complete flat plate shape. It may be a “flat resin” that is swollen or slightly recessed. In this case, it is sufficient to make the pressing surface of the mold (for example, the lower mold) correspond to the desired shape.

  A flat resin molding apparatus having a simple structure, low initial cost, low running cost, high releasability, and low damage rate can be obtained.

  Hereinafter, an example of an embodiment of the present invention will be described in detail based on the drawings.

  FIG. 1 is a schematic perspective view of a molding portion of a flat resin molding apparatus to which the present embodiment is applied. In addition, FIGS. 2A to 2D show manufacturing processes when a flat resin is molded using the molded portion having this configuration.

  The molding part E of the flat resin molding apparatus 12 according to this embodiment includes, in order from the bottom of FIG. 1, a frame body 16, an elastic sheet (first elastic sheet) 18 immediately above the frame body 16, and a cover plate (second The elastic sheet is composed of 20 layers.

  The frame body 16 is for determining the outer shape of the resin to be molded (the outer shape of the flat resin to be molded), and has a through hole 16A corresponding to the outer shape. Here, a rectangular through hole 16A is formed. That is, the flat resin molded by this molding apparatus is a rectangular flat resin corresponding to the shape of the through hole 16A.

  The elastic sheet 18 is disposed on the frame 16. The elastic sheet 18 is formed of a material that can be deformed into a shape along the inside (through hole 16A) of the frame 16 and can be restored. Specifically, an elastic material such as silicon rubber or ethylene propylene is used as a base material, and a thin film having high releasability (for example, a fluorine-based release film) is bonded thereto. In addition, it is preferable that this elastic sheet 18 has a heat resistance characteristic of 120 ° C to 130 ° C.

  The cover plate 20 is capable of opening and closing the uppermost part of the molding part E. In this embodiment, it is formed of a thin metal plate made of stainless steel having a thickness of 0.1 mm to 0.15 mm.

  As shown in FIG. 2, the molding apparatus 12 further includes a mold (heat press) 24 that heats and pressurizes the molded part E from above and below by a driving mechanism (not shown), and a molded part E after heating and pressurization. Are separately provided with a cool press 26 that removes heat from above and below, and an extruding mechanism 28 that projects the molded flat resin P upward and pushes the flat resin P as a molded product upward. In addition, although not shown, in addition to this, a charging mechanism for the molded resin Po, a suction mechanism for the elastic sheet 18 to be described later, a suction mechanism for peeling the molded flat resin P from the elastic sheet 18, and a peeled flat plate An unloader mechanism for collecting the resin P is attached. Since these specific configurations can adopt configurations that are already known in order to realize the same type of functions in the past, detailed description thereof will be omitted here.

  Hereinafter, the operation of the molding apparatus 10 will be described in detail with reference to FIG.

  As shown in FIG. 2A, the cover plate 20 of the molding part E is opened, and the elastic sheet 18 is sucked and deformed toward the through hole 16A side of the frame body 16 to form the pocket part 18A. In addition, as a deformation | transformation means of the elastic body sheet | seat 18 at this time, you may utilize mechanical pushing etc. instead of attraction | suction.

  A necessary amount of powdery resin (molded resin) Po as a raw material is put into the pocket portion 18A of the elastic sheet 18 formed by suction, and the cover plate 20 is closed. In this state, the molded part E having been charged with resin is moved to the position where the heat press 24 is installed. After the movement, the molded portion E is sandwiched from above and below by the heat press 24, and the molding resin Po is molded in the through hole 16A of the frame body 16 to obtain a flat resin P (see FIG. 2B). The heating temperature at this time is 60 ° C. to 100 ° C., and the applied pressure is 0.2 to 1.0 MPa.

  Since the flat resin P molded in the frame 16 in the molding part E is in a melted and softened state, the molding part E is moved again and sandwiched by the cool press 26, and heat is generated from the flat resin P. (See FIG. 2C). As a result, the temperature of the flat resin P decreases to about 10 ° C to 20 ° C.

  Next, the molded part E after heat removal is removed from the cool press 26, and the cover plate 20 is deformed and opened so as to be turned from one end side (the right side in FIG. 2). Due to this deformation, a so-called peeling line (a boundary line when the cover plate 20 is peeled from the flat resin P) is generated, so that the peeling stress can be concentrated on the peeling line and the cover plate 20 can be removed with a light load. It can peel from the flat resin P.

  Finally, as shown in FIG. 2D, the flat resin P is pushed upward together with the elastic sheet 18 by the extrusion mechanism 28, and the flat resin P molded by an unloader mechanism (not shown) is collected. Since a film having high peelability is stuck on the surface of the elastic sheet 18, for example, by pulling up the flat resin P by means of adsorption or the like, from the outermost peripheral side of the elastic sheet 18 toward the center side. Coupled with the generation of the moving separation line, the flat resin P can be easily separated from the elastic sheet 18.

  According to this embodiment, the molding resin Po is molded in a state of being sandwiched between two elastic sheets (the elastic sheet 18 and the cover plate 20). Can be performed very easily (with a light load). Therefore, the risk that the flat resin is damaged is extremely low, and the yield can be improved.

  Further, since the resin being molded does not squeeze out and come into contact with the mold, the probability that the flat plate resin is damaged is reduced in this respect as well.

  Since the two elastic sheets can be used repeatedly, the running cost is low.

  In this embodiment, since a thin stainless steel metal plate is employed as the cover plate 20, good deformation characteristics can be obtained, and heat conductivity is high. Efficient heat transfer can be realized. As a result, heat loss can be reduced and molding cycle time can be shortened.

  In the present invention, there is no particular limitation on the material used to form the first and second elastic sheets. Moreover, the specific shape etc. of the flat resin to be shape | molded are not specifically limited. Furthermore, in the said embodiment, although the 1st, 2nd elastic sheet was each formed with the independent member, you may make this form in the aspect which bent the single member. In this case, since the functions of the first and second elastic sheets are slightly different, for example, it is preferable to attach a film only to one side or another thin metal material. As described above, when the two elastic sheets are formed in a manner in which a single member is bent, the positional deviation between the two can be reduced, and the effect of preventing the resin from squeezing out can be enhanced accordingly.

  Further, according to the present invention, the molding part is composed of the frame, the first elastic sheet that can be deformed, and the second elastic sheet that can be opened and closed in order from the lower side. The case where the entire top and bottom are turned upside down for convenience is also included in the technical category.

  The present invention can be used particularly effectively in the field of molding a flat resin.

The schematic perspective view which shows the structure of the shaping | molding part of the shaping | molding apparatus with which embodiment of this invention was applied. Sectional drawing which shows the manufacturing process at the time of shape | molding flat resin using the said shaping | molding part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Molding apparatus 16 ... Frame 18 ... Elastic body sheet (1st elastic sheet)
20 ... Cover plate (second elastic sheet)
16A ... through hole 24 ... heat press (die)
26 ... Cool press 28 ... Extrusion mechanism E ... Molding part P ... Flat plate resin Po ... Molded resin

Claims (4)

In a flat resin molding apparatus that molds a resin to be molded supplied into a molding part into upper and lower molds to form a flat plate,
The molded part is
A frame for forming the outer shape of the flat resin;
A first elastic sheet that is disposed at an upper portion of the frame, can be deformed into a shape along the inside of the frame, and can be restored;
A second elastic sheet capable of opening and closing the uppermost part of the molding part, and molding is performed by supplying a resin to be molded between the first elastic sheet and the second elastic sheet. A flat resin molding apparatus. In claim 1,
A flat resin molding apparatus, wherein the first elastic sheet is obtained by attaching a thin film having high releasability from a mold to a substrate having elasticity. In claim 1 or 2,
The said 2nd elastic sheet is comprised with the thin metal plate. The shaping | molding apparatus of flat resin characterized by the above-mentioned. In any one of Claims 1-3,
A flat resin molding apparatus, wherein the first elastic sheet and the second elastic sheet are formed by bending a single elastic base material.

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