JP2011025531A - Mold for simultaneous molding and decorating - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a mold wherein a decorative sheet is moderately sucked in without generating the air leakage due to a pressure reduction in an absorption step to a cavity surface of the decorative sheet due to the reduced pressure suction. <P>SOLUTION: The mold has a clamp device 4 for fixing the decorative sheet 63 fed between the molds to A mold 2, a clamp member 41 is biased to the direction wherein a sheet contact surface 42 is directed to a sealing surface 23 by a spring 44, a mounting groove 24 is formed on the sealing surface, and an elastic sealing member 25 is mounted to the mounting groove. An abutting member 50 projecting by the distance of 0.5 mm or more and 0.7 mm or less is mounted to the sheet contact surface 42 and the closest approach gap d54 between the sheet contact surface and the sealing surface is restricted. The elastic sealing member 25 is made of the material coated with fluorine on the surface of a silicone rubber within the hardness of 5° or more and 60° or less. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a pair of molds for simultaneous decorating, in which a decorative sheet is disposed in a cavity, and a molded product is decorated simultaneously with injection molding.

  A transfer film is sandwiched between a pair of molds composed of a female mold and a male mold, a transfer film feeding device for feeding a transfer film between the molds, and a clamp member protruding from the female mold surface and the female mold surface. There is an injection molding simultaneous transfer device that clamps. Conventionally, in this apparatus, the transfer film is clamped between the clamp member and the female die while pressing the clamp member provided protruding from the female die against the surface of the female die by the action of a push bar provided on the male die. (For example, FIG. 10 of patent document 1)

  Moreover, although it is the same as that of the said conventional apparatus, the metal mold | die which abbreviate | omitted the push bar provided in the male type | mold is also used. That is, the clamp member is urged to the female surface by the spring. And the force which opposes the said urging | biasing is provided to a clamp member, and the clamp member is moved forwards or backwards with respect to the female type | mold surface.

  Such a mold is provided with a mounting groove on the surface of the female mold against which the clamp member abuts, and an O-ring which is an elastic sealing member is mounted in the mounting groove. A suction groove is provided on the cavity surface of the female mold.

And fixation of the transfer film in a metal mold | die is performed in the following processes.
(1) Positioning process of decorative sheet between molds
(2) Clamping process of decorative sheet on female mold
(3) Adsorption process of the decorative sheet to the cavity surface by vacuum suction In the above (3) adsorption process, in order for the decorative sheet to adhere to the cavity surface, it is necessary to draw the decorative sheet into the cavity. . That is, it is a requirement for adhesion that the decorative sheet and the O-ring contact portion are slightly shifted.

  However, in a mold in which the above-described push rod is omitted, when a molded product becomes large, a clamp member, an accompanying rod, a lift plate, and the like are increased in size and weight is increased. Accordingly, it is necessary to increase the force of the spring that urges the clamp member, and inevitably the urging force, that is, the force that presses the transfer sheet against the O-ring increases. As a result of perfect clamping, the decorative sheet is less pulled in the adsorption process. If the decorative sheet pulls in less, the decorative sheet does not adhere to the cavity surface of the mold, ink breaks (also referred to as a crack), the decorative sheet burns at the floating part, and wrinkles occur. There was a problem that a defective product was generated.

Japanese Patent Laid-Open No. 5-200780

  The problem to be solved is a pair of molds for simultaneous decorating in which the decorative sheet is pulled in properly without causing air leakage due to reduced pressure in the suction process of the decorative sheet to the cavity surface by vacuum suction. There is to get a mold.

  Other problems of the present invention will become apparent from the description of the present invention.

  Means for solving the problems will be described below. For ease of understanding, description will be made with reference numerals corresponding to the embodiments of the present invention, but the present invention is not limited to the embodiments.

A pair of molds for simultaneous decorating (1) according to one aspect of the present invention,
A pair of molds composed of an A mold (2) and a B mold (3), having a clamp device (4) for fixing a decorative sheet fed between the molds to the A mold;
A mold has a cavity surface (22) and a part surface (21) surrounding the cavity surface;
The clamp device includes a clamp member (41) having a sheet contact surface (42) that contacts the decorative sheet, a spring (44), and lift means (47, 48), and the sheet contact surface is an inner periphery of a part surface. The clamping member is biased by a spring in a direction in which the sheet contact surface faces the sealing surface, and the clamping member is biased by the operation of the lift means. Move forward and backward with respect to the sealing surface,
A mounting groove (24) is formed in the sealing surface, and an elastic sealing member (25) is mounted in the mounting groove,
The cavity surface has a vacuum suction means (26) for sucking and adhering the decorative sheet,
In a pair of molds for simultaneous decoration,
A contact member (50) protruding from the sheet contact surface of the clamp member to the sealing surface method by a distance of 0.5 mm or more and 0.7 mm or less is attached to the sheet contact surface, and the sheet contact surface and the sealing surface While restricting the closest approach gap (d54),
The elastic sealing member is a member made of a material obtained by coating a surface of silicon rubber having a hardness of 5 ° or more and 60 ° or less with a slipping improver.

In a preferred embodiment of the present invention, the abutting members in the pair of molding simultaneous decorating dies according to the present invention are a rectangular abutting plate (51), a vertical wall (52) rising from one end side of the abutting plate, An upper plate (53) extending laterally from the upper end side of the vertical wall and facing the contact plate,
It may be inserted into the clamp member and sandwiched by the contact plate and the upper plate.

  In another preferred embodiment of the present invention, the slip improver in the pair of molds for simultaneous decorating according to the present invention may be fluorine.

  However, in the present invention, the slipperiness improver is not limited to fluorine, and may be, for example, a silicon-based material.

  In another preferred embodiment of the present invention, the elastic sealing member in the pair of molds for simultaneous decorating according to the present invention may be an O-ring.

  However, in the present invention, the elastic sealing member is not limited to the O-ring, and may be, for example, a U-ring or a string-like rubber part having a complicated cross section.

  The present invention described above, preferred embodiments of the present invention, and components included in these can be implemented in combination as much as possible.

  The pair of molds for simultaneous decorating of the present invention, together with other technical features, attaches a specific contact member to the clamp member, and regulates the closest approach gap between the sheet contact surface and the sealing surface, Since the elastic sealing member uses a member made of a material in which the surface of silicon rubber having a hardness in the range of 5 ° to 60 ° is coated with a slipping improver, an advantage is that an appropriate amount of the decorative sheet is drawn in the adsorption process. There is.

  For this reason, the molded product manufactured using the metal mold | die concerning this invention suppresses the defect of molded products, such as a crack (it is also called a crack) of an ink, a burning, and generation | occurrence | production of wrinkles.

FIG. 1 is a cross-sectional explanatory view of a molding apparatus comprising a pair of molds for simultaneous decorating and a decorative sheet feeding apparatus according to the present invention. FIG. 2 is an explanatory view showing a part surface of the A mold. FIG. 3 is an enlarged partial sectional view showing a clamp member portion. FIG. 4 is a perspective explanatory view of the contact member 50. FIG. 5 is an enlarged partial perspective view of the clamp member to which the contact member is attached.

  Hereinafter, a pair of molds for simultaneous decorating according to an embodiment of the present invention will be further described with reference to the drawings. The dimensions, materials, shapes, relative positions, etc. of the members and parts described in the embodiments of the present invention are not intended to limit the scope of the present invention only to those unless otherwise specified. It is just an illustrative example.

  Referring to FIG. 1 and the like, a pair of molds for simultaneous decorating 1 includes an A mold 2 and a B mold 3. The mold 1 includes a clamping device 4. The A mold 2 has a cavity surface 22 and a part surface 21. The part surface 21 surrounds the cavity surface 22.

  The clamp device 4 includes a clamp member 41, a rod 43, and a lift plate 47. A surface of the clamp member 41 that faces the part surface 21 of the A mold 2 is a sheet contact surface 42. A region which is a part of the part surface 21 of the A mold 2 and faces the sheet contact surface 42 is named a sealing surface 23. The sealing surface 23 is an inner peripheral region of the part surface 21. The sealing surface 23 is an outer peripheral region of the cavity surface 22.

  The clamp member 41 protrudes from the part surface 21 of the A mold 2 to the B mold 3 side. The clamp member 41 may fix the upper part and the lower part of the decorative sheet positioned on the cavity surface, or may fix all four circumferences of the decorative sheet.

  The clamp member 41 is fixed to one end of the rod 43. A flange 45 is fixed to the other end of the rod 43. The rod 43 passes through a hole formed in the A mold 2. A spring 44 is installed between the flange 46 and the bottom surface 27 of the A mold 2. The spring 44 is installed in a compressed state. Therefore, the spring 44 biases the rod 43 toward the bottom surface 27 side of the A mold 2. Since the clamp member 41 is fixed to the rod 43, the clamp member 41 is urged to the right side of the drawing. That is, the sheet contact surface 42 is biased in a direction approaching the sealing surface 23 that is a part of the part surface 21.

  A lift plate 47 is movably installed on the rear end (right side of the sheet) of the rod. If the operating rod 48 is operated to bring the lift plate 47 into close contact with the rear end 46 of the rod and further move leftward against the bias of the spring 44, the clamp member 41 is removed from the sealing surface 23. fall back. If the force for pressing the operation rod 48 is removed, the clamp member 41 advances in the direction of the sealing surface 23 by the bias of the spring 44.

  The B mold 3 is paired with the A mold 2 to form a cavity that becomes the contour of the molded product. The B mold 3 includes an injection port 32 for injecting molten resin into the cavity. When the mold 1 is clamped, the clamp member 41 fits into the recess 33 and fits.

  A mounting groove 24 is formed in the sealing surface 23 of the A mold 2. The mounting groove 24 surrounds the cavity surface 22. An O-ring 25 that is an elastic sealing member is mounted in the mounting groove 24.

  The cavity surface 22 is provided with an intake groove 26 for sucking the decorative sheet 63 and bringing it into close contact with the cavity surface 22 of the A mold. The suction groove 26 is a decompression suction means. The intake groove 26 is connected to a decompression device (not shown).

  The decorative sheet feeding device 60 sends the decorative sheet 63 between the dies. The decorating sheet 63 may be a transfer sheet or an insert sheet. The transfer sheet has a transfer layer on a long base sheet. The transfer layer is formed by sequentially laminating a release layer, a design layer, an adhesive layer, and the like. The release layer is a layer that imparts peelability between the base sheet and the transfer layer. The design layer is a layer that imparts decorativeness and functionality to the surface of the molded product. There are a normal printed pattern and a conductive pattern formed of a conductive material. The adhesive layer is a layer that adheres the transfer layer and the molded product. The decorative sheet 63 may be a transfer sheet that peels off the base sheet after close contact with the surface of the molded product and transfers only the transfer layer to the surface of the molded product.

  Alternatively, the decorative sheet 63 may be an insert sheet having a laminated structure similar to that of the transfer sheet and the base sheet remaining on the surface of the molded product. The insert sheet punches out a necessary portion of the sheet by closing the mold, and transfers the transfer layer together with the base sheet onto the surface of the molded product.

  The decorative sheet feeding device 60 is a device that feeds the decorative sheet 63 between the molds at a predetermined pitch. The predetermined pitch is usually a one-shot length used for one injection molding. The decorative sheet feeding device 60 includes a sheet roll 61 and a winding roll 62. The decorative sheet 63 is unwound from the sheet roll 61 and wound on the take-up roll 62. A unit symbol 64 included in one shot is shown on the decorative sheet 63 shown in FIG.

  A contact member 50 protruding in a direction from the sheet contact surface 42 toward the sealing surface 23 is attached to the sheet contact surface 42 of the clamp member 41.

  FIG. 4 is a perspective view showing the contact member 50. The contact member 50 includes a square contact plate 51, a vertical wall 52 rising from one end side of the contact plate 51, and an upper plate 53 extending laterally from the upper end side of the vertical wall and facing the contact plate. The contact member 50 was manufactured from NAK80, which is a metal.

  As shown in FIG. 5, the contact member 50 is inserted and attached to the clamp member 41 so that the clamp member 41 is sandwiched between the contact plate 51 and the upper plate 53. If the contact member has a U-shaped cross section as described above, there is an advantage that attachment and replacement are easy.

  Referring to FIG. 3, if the clamp member 41 moves to the A mold side by the bias of the spring, the movement stops when the contact plate 51 contacts the sheet contact surface 42 and the sealing surface 23. Thus, the closest approach gap d54 between the sheet contact surface 42 and the sealing surface 23 is regulated by the thickness of the contact member. The closest approach gap d54 can be rephrased as an extension of the O-ring 25.

  The value of the closest gap d54 and the material of the O-ring 25 were changed, and further, the O-ring 25 was changed to the presence / absence of coating to test the degree of decorative sheet pull-in and reduced-pressure leakage. The results are shown in Table 1. Fluorine was selected as the coating material that is a slipperiness improver.

In Table 1, the slipperiness of the decorative sheet is
○: Moved △: Moved slightly ×: Indicates that it did not move at all. Moreover, in Table 1, the part shown by-represents that it has not experimented.

  The depth of the mounting groove was set to 3.2 mm. Then, the thickness of the block gauge is set to 3.2 mm + gap value, the decorative sheet and the O-ring are sandwiched between the block gauges, and the amount of movement when the decorative sheet is pulled by hand is defined as the above-mentioned three-stage slipperiness. evaluated.

  If the gap is 0.8mm, the actual mold will cause air leakage during vacuum suction, or air leakage may occur. Therefore, it is not necessary to describe the slipperiness of the decorative sheet. did.

  From the above, the projecting distance of the contact member was selected from 0.5 mm to 0.7 mm. The elastic sealing member was a member made of a material obtained by coating the surface of silicon rubber having a hardness in the range of 5 ° to 60 ° with a slipperiness improver. Here, examples of the slipperiness improver include fluorine and silicon-based materials.

  Next, a manufacturing process of a resin molded product by injection molding using this mold will be described.

  First, the operation rod 48 of the lift plate 47 is moved to pull the clamp member 41 away from the sealing surface 23. Then, the pattern 64 on the transfer sheet 63 is positioned in the cavity.

  The force applied to the operation rod 48 of the lift plate 47 is released, and the clamp member 41 is energized by a spring. In this way, the decorative sheet is pressed against the sealing surface 23 of the A mold 21 by the clamp member 41.

  Next, the cavity of the A mold is decompressed, and the decorative sheet 63 is sucked. Since the decorative sheet 63 is in contact with the O-ring, the pressure reduction of the cavity proceeds. The continuous transfer sheet 11 is brought into close contact with the cavity surface 22 by being pressed against the atmospheric pressure. At this time, in the decorative sheet 63, the portion in contact with the O-ring slips and a minute sheet is drawn. For this reason, the sheet adheres along the cavity surface.

  Thereafter, the A mold 41 moves to the B mold 42 side, and the mold is closed. Then, resin melted by heating is injected into the cavity from the gate provided in the B mold. At this time, the design on the decorative sheet 63 is transferred to the molding resin side by the pressure of the molten injection resin.

  After cooling or allowing to cool, the A mold and the B mold are opened, and the molded product is taken out.

DESCRIPTION OF SYMBOLS 1 A pair of shaping | molding metal mold | die 2A metal mold | die 3B metal mold | die 4 Clamp apparatus 21 Part surface 22 Cavity surface 23 Sealing surface 24 Mounting groove 25 O-ring which is an elastic sealing member 26 Suction which is decompression suction means Groove 27 Bottom surface 31 Part surface 33 Recessed portion 41 Clamp member 42 Sheet contact surface 43 Rod 44 Spring 47 Lift plate 50 Contact member 51 Contact plate 52 Vertical wall 53 Upper plate 60 Decorated sheet feeding device 63 Decorated sheet 64 Design d54 Closest gap

Claims (4)

A pair of molds composed of an A mold and a B mold, having a clamp device for fixing a decorative sheet fed between the molds to the A mold,
A mold has a cavity surface and a part surface surrounding the cavity surface;
The clamp device has a clamp member having a sheet contact surface that contacts the decorative sheet, a spring and a lift means, and the sheet contact surface faces a sealing surface that is an inner periphery of a part surface, The spring is biased in the direction toward the sealing surface by the spring, and the clamp member moves forward and backward with respect to the sealing surface under the bias by the operation of the lift means,
A mounting groove is formed on the sealing surface, and an elastic sealing member is mounted on the mounting groove.
The cavity surface has a vacuum suction means for sucking and adhering the decorative sheet,
In a pair of molds for simultaneous decoration,
A contact member that protrudes from the sheet contact surface of the clamp member to the sealing surface method by a distance of 0.5 mm or more and 0.7 mm or less is attached to the sheet contact surface, and the closest gap between the sheet contact surface and the sealing surface As well as
The elastic sealing member is a member made of a material obtained by coating a surface of silicon rubber having a hardness in a range of 5 ° to 60 ° with a slipping improver.
A pair of molds for simultaneous decoration. The contact member comprises a square contact plate, a vertical wall rising from one end side of the contact plate, an upper plate extending laterally from the upper end side of the vertical wall and facing the contact plate,
The pair of molds for simultaneous decorating according to claim 1, wherein the mold is inserted into the clamp member, and the clamp member is sandwiched and adhered by the contact plate and the upper plate.   The pair of molds for simultaneous decorating according to claim 1 or 2, wherein the slipperiness improver is fluorine.   The pair of molds for simultaneous decorating according to any one of claims 1 to 3, wherein the elastic sealing member is an O-ring.

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