JP2010195000A - In-mold transfer mold and method for manufacturing in-molded transferred article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an in-mold transfer mold, which is a mold having a hollow for molding a resin molded article, capable of executing normal transfer to a transferring area and not causing a breakage of a transfer sheet. <P>SOLUTION: The in-mold transfer mold for manufacturing the resin molded article has the transferring area, a vertical wall, and the hollow, the vertical wall is erected from the outer peripheral line of the transferring area, the hollow is recessed to the back side of a transferring face, and the vertical wall constitutes at least part of a boundary face of the hollow. The mold includes a front face side mold 30, a rear face side mold 40 and a placed piece 60. A cavity 51 is formed by the front face side mold and the rear face side mold, the cavity includes a space corresponding the hollow, and the placed piece is arranged in the cavity to fill the space corresponding the hollow. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a mold for simultaneous molding and a method for producing a molded simultaneous transfer product. More specifically, a molding simultaneous transfer mold suitable for manufacturing a molded simultaneous transfer product that does not tear the transfer sheet even if the transfer region and the cavity have a specific shape and a specific relationship, and a method for manufacturing the molded simultaneous transfer product It is about.

  Conventionally, as a method for decorating the surface of a resin molded product, a molding simultaneous transfer method using a transfer sheet has been performed. In the molding simultaneous transfer method, a transfer sheet formed with a release layer, for example, a decorative layer as a design layer, an adhesive layer, etc. on a base sheet is sandwiched in a molding die, and a resin is injected into the die. At the same time as obtaining the resin molded product, the transfer sheet is adhered to the surface of the molded product, and then the base sheet is peeled off, and the transfer layer is transferred to the surface to be transferred for decoration.

  However, in the production of a resin molded product having a specific cavity, there is a problem that the transfer sheet is torn during simultaneous transfer of molding. An example of a resin molded product having such a cavity is a window frame of a window having a relatively large area. A frame-like insert member is often inserted into the window at the time of molding.

  If the transfer sheet is torn, the resin molded product will have poor adhesion, a pattern flow or wrinkles, etc., resulting in defective products, dust in the manufacturing facility, mold contamination, etc., and continuous transfer In the case of a sheet, various inconveniences occur such as the dimensions are disturbed and the next transfer position is not aligned.

  Conventionally, in order to solve the above-mentioned problem that the transfer sheet is broken, the physical properties of the transfer sheet are optimized. (For example, refer to Patent Document 1).

  In addition, in order to solve the same problem, there is one in which the gate position of the molding resin to the mold is optimized (for example, see Patent Document 2).

JP 2008-80719 A Japanese Patent Laid-Open No. 11-77742

  Resin molded products that are manufactured by the simultaneous molding transfer method and have a cavity recessed on the back side of the transfer surface with the transfer area and vertical wall interposed between them. It is a product. For this reason, tearing of the transfer sheet cannot be resolved by optimizing the physical properties of the conventional transfer sheet and optimizing the gate position of the mold.

  The problem to be solved is a mold for a resin molded product having a specific cavity, which is normally transferred to a transfer area, and a mold for simultaneous molding that does not cause the transfer sheet to break. There is in getting.

  Another object of the present invention is to provide a method for producing a resin molded product having a specific cavity, wherein the transfer is performed normally in the transfer region and the transfer sheet is not torn.

  Furthermore, a typical example of a shape having a specific cavity is a window, and in view of the fact that a frame-shaped insert member is often inserted into the window frame portion, a method for producing a resin molded product having a specific cavity is a method. Thus, there is provided a method for producing a molded simultaneous transfer product in which transfer is normally performed in a transfer region, the transfer sheet is not torn, and an insert of an insert member is added.

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

The mold for simultaneous transfer molding according to one aspect of the present invention is
Manufactured by a simultaneous molding transfer method, having a transfer region, a vertical wall and a cavity, the vertical wall falling from the outer peripheral line of the transfer region, the cavity being a cavity recessed on the back side of the transfer surface, at least of the cavity In the mold for simultaneous transfer molding used for the production of the resin molded product, which is the vertical wall, a part of the boundary surface,
It consists of front side mold, back side mold and placing piece,
A cavity is formed by the front side mold and the back side mold,
The cavity includes a cavity-equivalent space;
The placing piece is disposed in the cavity and fills the space corresponding to the cavity.

  In a preferred embodiment of the present invention, the mold for simultaneous molding and transfer has a surface continuous to the lower end line of the vertical wall equivalent wall in the cavity as a lower end surface equivalent surface, and a surface corresponding to the transfer region surface. As the transfer region surface equivalent surface, a step between the transfer region surface equivalent surface and the lower end surface equivalent surface in the cavity may be 1.0 mm or more.

  In this preferred embodiment, a placing piece is placed on a mold having a level difference of 1.0 mm or more, which has been easily broken by a conventional transfer sheet, and the effect of preventing the transfer sheet from being torn is more effectively exhibited. It is a metal mold.

  In a preferred embodiment of the present invention, the mold for simultaneous transfer and molding has a surface corresponding to the surface of the transfer region in the cavity as a surface corresponding to the surface of the transfer region, and the surface corresponding to the surface of the transfer region in the cavity. Of the two corners formed by the vertical line standing at the edge of the wall and the wall corresponding to the vertical wall, the corner having the smaller value may be 20 degrees or less.

  In this preferred embodiment, a placing piece is placed on a mold in which the angle of the vertical wall equivalent wall is 20 degrees or less and the conventional transfer sheet was easily torn, and the effect that the transfer sheet is not torn is more effectively exhibited. This is a mold for simultaneous transfer molding.

  In a preferred embodiment of the present invention, the mold for simultaneous transfer and molding has a surface corresponding to the surface of the transfer region in the cavity as a surface equivalent to the surface of the transfer region, and the surface corresponding to the transfer region surface in the cavity. The radius of the chamfered curved surface of the intersection line between the vertical wall and the vertical wall may be 0.3 mm or less.

  In the present preferred embodiment, a placing piece is placed on a mold in which a conventional transfer sheet having a radius of a chamfered curved surface of 0.3 mm or less was easily torn, and the effect that the transfer sheet is not torn is more effectively exhibited. This is a mold for simultaneous molding and molding.

A method for producing a molded simultaneous transfer product according to one aspect of the present invention includes the following steps, and is a method for producing a molded simultaneous transfer product having a cavity recessed on the back side of a transfer surface with a transfer region and a vertical wall interposed therebetween. is there.
(B) a step of placing a placing piece in a cavity formed by the front surface side mold and the back surface side mold so as to fill a space corresponding to the cavity; and (b) a transfer sheet having a transfer layer formed on a base material sheet,
The base sheet covers a portion corresponding to the transfer region in the cavity and the surface of the placing piece,
The transfer layer is formed on a portion covering a transfer region corresponding portion on the base sheet,
The step of disposing the transfer sheet on the inner surface of the front surface mold in the cavity c The front surface mold and the back surface mold are clamped, and molten molding resin is injected into the cavity. Step of opening the mold after solidification Step of taking out the resin molded product from the cavity.

The method for producing a molded simultaneous transfer product according to another aspect of the present invention comprises the following steps, and has a cavity recessed on the back side of the transfer surface with a transfer region and a vertical wall interposed therebetween, and the back side of the resin molded product And a molding simultaneous transfer product in which a metal insert member is inserted from the transfer region and extends in a frame shape toward the inside of the cavity.
B-1 Step of placing a placing piece and placing an insert member in a cavity formed by the front surface side die and the back surface side die so as to fill the space corresponding to the cavity. B Transfer layer on the base sheet A transfer sheet formed of
The base sheet covers a portion corresponding to the transfer region in the cavity and the surface of the placing piece,
The transfer layer is formed on a portion covering a transfer region corresponding portion on the base sheet,
The step of disposing the transfer sheet on the inner surface of the front surface mold in the cavity c The front surface mold and the back surface mold are clamped, and molten molding resin is injected into the cavity. Step of opening the mold after cooling and solidification Step of taking out the resin molded product from the cavity.

In a preferred embodiment of the present invention, a method for producing a molded simultaneous transfer product includes:
The placing piece and the insert member in the step of A-1 are positioned through the boss projection provided in the placing piece through the boss hole opened in the insert member,
The removal step in step D includes a step of protruding the protrusion provided on the placing piece with the first boss pushing pin to take out the placing piece, and then pushing out the resin molded product with the second molded product pushing pin. May be.

  According to this preferred embodiment, the relative position of the placing piece and the insert member is easily determined. Further, it is possible to provide a more preferable arrangement of the projecting pin for releasing the placing piece from the back side mold.

  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 mold for simultaneous molding and transfer according to one aspect of the present invention includes a placing piece arranged to fill a cavity-corresponding space in the cavity together with other components. The transfer area and the cavity-corresponding space become a continuous plane by the placing piece. For this reason, the transfer sheet does not stretch during the simultaneous molding and transfer. The mold for simultaneous molding and transfer according to the present invention is a mold suitable for simultaneous molding and transfer in which the transfer sheet is not torn.

  In the method for manufacturing a molded simultaneous transfer product according to one aspect of the present invention, a placing piece is arranged in a cavity-corresponding space in the cavity together with other components. Since the placing piece fills the cavity-corresponding space, the transfer area and the cavity-corresponding space become a continuous plane. For this reason, the transfer sheet does not stretch during the simultaneous molding and transfer. Therefore, the transfer sheet is not torn, and a resin molded product manufacturing method in which transfer is normally performed in the transfer region is obtained.

  The method for producing an insert-molded simultaneous transfer product according to another aspect of the present invention includes, in addition to other components, an insert member that projects in a frame shape in the direction toward the inside of the cavity, and is placed in a cavity-corresponding space in the cavity. A piece is placed. Since the placing piece fills the cavity-corresponding space, the transfer area and the cavity-corresponding space become a continuous plane. For this reason, the transfer sheet does not stretch during the simultaneous molding and transfer. Therefore, the transfer sheet is not torn, and the transfer is normally performed in the transfer region, and the manufacturing method of the resin molded product in which the frame-like insert is added.

FIG. 1 is a perspective view of a resin molded product 10. FIG. 2 is a conceptual explanatory diagram of a method for producing a resin molded product in which a placing piece is arranged. FIG. 3A is a perspective view of another resin molded product 10a, and FIG. 3B is a perspective view of another resin molded product 10b. FIG. 4 is an explanatory cross-sectional view showing the shape of the boundary between the cavity and the frame. FIG. 5 is a cross-sectional explanatory view of a mold in which a placing piece is arranged in the cavity. FIG. 6 is an explanatory diagram of a transfer sheet. FIG. 7 is an explanatory diagram 1 of the molding process. FIG. 8 is a second explanatory diagram of the molding process.

  Hereinafter, with reference to the drawings, a method for producing a mold for simultaneous molding and a molded simultaneous transfer product according to an embodiment of the present invention will be further described. 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, the resin molded product 10 has a cavity 13 surrounded by a frame body 16. The resin molded product 10 is a window member. The cavity 13 is a through hole and penetrates the front surface 11 and the back surface of the resin molded product 10. The resin molded product 10 has a metal insert member 20 inserted therein.

  The insert member 20 projects in a frame shape from the frame 16 toward the inside of the cavity 13, and a part of the insert member 20 forms a frame-shaped protrusion 21. The insert member 20 is located on the back side of the resin molded product 10. That is, there is a step between the surface 11 of the resin molded product 10 and the surface of the insert member, and the surface of the insert member is located closer to the back than the surface 11 of the resin molded product 10. The frame-like protruding portion 21 holds a window member such as an acrylic plate.

  The surface of the frame 16 is a transfer region 14 that is decorated by a simultaneous molding transfer method. The decoration includes not only the addition of a pattern, color, metal foil, etc., but also the addition of a film that gives unevenness to the surface, and the addition of a film that changes the surface physical properties such as hard and soft.

  In the present invention, the surface of the transfer region 14 may be referred to as a transfer region surface.

  Referring to FIG. 2, in the present invention, a placing piece 60 is arranged in a space corresponding to a cavity in a mold cavity to perform simultaneous molding and transfer. Since the placing piece 60 closes the space corresponding to the cavity, the transfer region and the surface of the space corresponding to the cavity become one plane in the mold. The “surface” of the cavity-equivalent space can also be called the “boundary surface”. For this reason, the transfer sheet is held flat during simultaneous molding transfer, and the transfer sheet does not stretch and is not torn.

  The placing piece is also called an insertion mold or a split core, and is placed in a portion in the mold cavity where it is desired to prevent the molten resin from reaching. Usually, the placing piece is used for undercut processing.

  The resin molded product manufactured by the molding simultaneous transfer mold and the molding simultaneous transfer product manufacturing method according to the present invention is not limited to a window member, but includes a transfer region, a vertical wall and a cavity that satisfy certain conditions. It is a resin molded product.

  The resin molded product 10 illustrated in FIG. 1 will be described as an example. The resin molded product 10 includes a transfer region 14, a vertical wall 15, and a cavity 13. The vertical wall 15 falls from the outer peripheral line of the transfer region, and the cavity 13 is a cavity that is dented to the back side of the transfer surface. The boundary surface of the cavity 13 is a vertical wall 15. The cavity 13 is surrounded by a vertical wall.

  With reference to Fig.3 (a), the other resin molded product 10a is demonstrated. The resin molded product 10a has a U shape in plan view. The resin molded product 10a has a transfer region 14a, a vertical wall 15a, and a cavity 13a. The vertical wall 15a falls from the outer peripheral line of the transfer region, and the cavity 13a is a cavity that is dented to the back side of the transfer surface. The boundary surface 3 of the cavity 13a is a vertical wall 15a, and one boundary surface (the vertical wall portion on the right side of the paper surface) has no wall. Moreover, the cavity 13a penetrates the front surface and the back surface of the resin molded product 10a.

  With reference to FIG.3 (b), the other resin molded product 10b is demonstrated. The resin molded product 10b has a shape in which a U-shaped resin is placed on a flat plate. The resin molded product 10b has a transfer region 14b, a vertical wall 15b, and a cavity 13b. The vertical walls 15b and 151b fall from the outer peripheral line of the transfer region, and the cavity 13b is a cavity recessed on the back side of the transfer surface. The cavity 13b has a T shape in plan view. The boundary surface of the cavity 13b is a vertical wall 15b and a vertical wall 151b, and one boundary surface (the vertical wall portion on the right side of the paper) has no wall. The cavity 13 a has no front-side boundary, and the back-side boundary is the stepped portion 17.

  With reference to FIG. 4, the shape of the cavity and the border of the frame body and the extension of the transfer sheet when there is no placing piece will be described.

  The frame 161 has a transfer area surface 81, a lower end surface 82, and a vertical wall 83. The transfer region surface 81 is a surface created by the transfer region, and is a surface continuous with the upper end line of the vertical wall 83. The lower end surface 82 is a surface continuous with the lower end line of the vertical wall 83.

  The distance between the transfer area surface 81 and the lower end surface 82 is a step h. When the level difference h is 1.0 mm or more, the transfer sheet is greatly stretched and easily broken.

  Of the two corners formed by the vertical line 84 and the vertical wall 83 from the transfer region surface end, the corner having the smaller value is the gradient α. When the gradient α is 20 degrees or less, the transfer sheet is greatly stretched and easily broken.

  The radius of the chamfered curved surface of the intersecting line between the transfer area surface 81 and the vertical wall 83 is represented by R. When R is 0.3 mm or less, the transfer sheet is greatly stretched and easily broken.

  The molding simultaneous transfer mold and the molding simultaneous transfer product manufacturing method according to the present invention are used for manufacturing a resin molded product having a certain cavity, and in particular, (1) the step h is 1.0 mm or more, ( 2) It is suitable for the production of a resin molded product having a cavity satisfying any one of the gradient α of 20 degrees or less and (3) R of 0.3 mm or less.

  The cavity 51 is formed by the front surface side mold 30 and the back surface side mold 40. One of the front side mold 30 and the back side mold 40 is usually a movable mold, and the other is a fixed mold. Either may be a movable mold or a fixed mold. The cavity 51 is surrounded by the inner surface 31 of the front surface side mold and the inner surface 41 of the back surface side mold. The cavity 51 has a transfer area surface equivalent surface 91, a lower end surface equivalent surface 92, and a vertical wall equivalent wall 93. In this embodiment, the vertical wall equivalent wall 93 is one surface of the placing piece 60.

  The cavity 51 can be considered by dividing it into a frame equivalent portion 54 and a cavity equivalent space. The frame body corresponding portion 54 is a portion that is filled with molding resin and becomes a frame body.

  The placing piece 60 is arranged so as to close the space corresponding to the cavity. A tapered projection 42 having a quadrangular pyramid shape is formed on the inner surface 41 of the back side mold 40. Here, the quadrangular pyramid means a solid obtained by cutting the quadrangular pyramid along a plane parallel to the bottom surface and excluding the small quadrangular pyramid. In the central portion of the placing piece 60, there is a positioning taper hole 62 whose inner surface has a quadrangular pyramid shape. The taper protrusion 42 is fitted into the positioning taper hole 62, and the direction and direction of the placing piece 60 are determined in the cavity 51.

  In the transfer sheet 70, a transfer layer 72 is formed on a base sheet 71. In the transfer layer 72, for example, a release layer, a pattern layer, and an adhesive layer are laminated in this order on a base sheet. The transfer layer 72 is formed in a frame shape. The transfer layer is transferred to a transfer region 14 which is a surface portion of the frame body 14 of the resin molded product 10. The illustrated transfer sheet 70 is a continuous sheet, and a plurality of transfer layers 72 a and 72 b are formed on a belt-shaped base sheet 71. When the transfer layer 72a is transferred to the resin molded product, the transfer sheet 70 is moved to position the transfer layer 72b in the cavity, and the transfer layer 72b is transferred to the next resin molded product.

  There is a region 73 without a transfer layer inside the transfer layer 72. Area 73 is an area only for the base sheet. The region 73 is positioned on the surface of the placing piece. That is, the region 73 is positioned on the surface of the space corresponding to the cavity (which may be called a boundary surface).

A manufacturing process of the resin molded product 10 will be described with reference to FIGS.
(1) Mold opening The front surface side mold 30 and the back surface side mold 40 are opened. A transfer sheet 70 is arranged on the inner surface of the front side mold 30.
(2) Combining the placing piece and the insert member The placing piece 60 and the insert member 20 are joined. At this time, a relative position between the placing piece 60 and the insert member 20 is determined by fitting a boss hole 23 which is a through hole provided in the insert member 20 into a boss protrusion 61 formed on the placing piece 60. The insert member 20 is metallic, for example, aluminum, stainless steels, iron, or other metal products.

(3) Placement piece and insert member insertion A combination of the placement piece and the insert member is inserted into the cavity. The positioning taper hole 62 of the placing piece 60 is fitted into the taper protrusion 42 of the back surface side mold 40, positioned, and inserted.

  Here, the arrangement process of the transfer sheet 70 described in the (1) mold opening process and the insertion process of the placing piece have no relationship in time. For this reason, either one of the steps may be preceded, or both steps may be performed simultaneously. The transfer layer 72 of the transfer sheet faces the frame equivalent portion 54.

(4) Mold closing The front side mold 30 and the back side mold 40 are closed. (5) Injection molding Molding is performed by injecting molten molding resin into the cavity. At the same time, the transfer layer 72 is transferred to the molding resin side by pressure heat. Allow to cool or let stand and wait for the molded resin to solidify.

(6) Mold opening The front surface side mold 30 and the back surface side mold 40 are opened. The transfer layer 72 is transferred to the transfer area of the resin molded product. At the same time, the insert member 20 is inserted.

(7) Placement piece protrusion (first stage)
The placing piece 60 is released from the back surface side mold 40 by pressing the first boss protruding pin 43 and the first piece protruding pin 44. The first boss protruding pin 43 passes through the boss hole 23 of the insert member 20. The boss hole 43 has a role of positioning the insert member and a role of a passing hole of the protruding pin.

(8) Extruding the resin molded product (second stage)
The resin molded product is released from the back surface side mold 40 by pushing in the second molded product ejection pin 45.

10, 10a, 10b Resin molded product 11 Surface 13 Cavity 14 Transfer region 15 Vertical wall 16 Frame body 20 Insert member 21 Frame-like protrusion 23 Boss hole 30 Front side mold 40 Back side mold 42 Taper protrusion 43 First boss protrusion Pin 44 First piece ejection pin 45 Second molded product ejection pin 51 Cavity 54 Frame equivalent portion 60 Placement piece 61 Boss protrusion 62 Positioning taper hole 70 Transfer sheet 71 Description sheet 72 Transfer layer 91 Transfer area surface equivalent surface 92 Equivalent to lower end surface Surface 93 Wall equivalent to vertical wall

Claims (7)

Manufactured by a simultaneous molding transfer method, having a transfer region, a vertical wall and a cavity, the vertical wall falling from the outer peripheral line of the transfer region, the cavity being a cavity recessed on the back side of the transfer surface, at least of the cavity In the mold for simultaneous transfer molding used for the production of the resin molded product, which is the vertical wall, a part of the boundary surface,
It consists of front side mold, back side mold and placing piece,
A cavity is formed by the front side mold and the back side mold,
The cavity includes a cavity-equivalent space;
A mold for simultaneous transfer molding, wherein the placing piece is disposed in the cavity and fills the space corresponding to the cavity. The surface continuing to the lower end line of the vertical wall equivalent wall in the cavity is a lower surface equivalent surface, the surface corresponding to the transfer region surface is a transfer region surface equivalent surface,
2. The mold for simultaneous transfer molding according to claim 1, wherein a level difference between the surface corresponding to the transfer region surface and the surface corresponding to the lower end surface in the cavity is 1.0 mm or more. A surface corresponding to the surface of the transfer region in the cavity is a surface equivalent to the transfer region surface,
2. The angle between the vertical line standing at the end of the surface corresponding to the transfer region surface in the cavity and the vertical wall corresponding to the vertical wall is a small value of 20 degrees or less. The mold for simultaneous molding and molding described in any one of 2 to 2. A surface corresponding to the surface of the transfer region in the cavity is a surface equivalent to the transfer region surface,
4. The simultaneous molding transfer according to claim 1, wherein a radius of a chamfered curved surface of an intersection line between the surface corresponding to the transfer area and the wall corresponding to the vertical wall in the cavity is 0.3 mm or less. Mold. A method for producing a molded simultaneous transfer product comprising the following steps and having a cavity recessed on the back side of a transfer surface with a transfer region and a vertical wall interposed therebetween.
(B) a step of placing a placing piece in a cavity formed by a front surface side mold and a back surface side mold so as to fill a space corresponding to a cavity;
The base sheet covers a portion corresponding to the transfer region in the cavity and the surface of the placing piece,
The transfer layer is formed on a portion covering a transfer region corresponding portion on the base sheet,
The step of disposing the transfer sheet on the inner surface of the front side mold in the cavity c The front side mold and the back side mold are clamped, and a molten molding resin is injected into the cavity. The process of opening the mold after solidification D The process of taking out the resin molded product from the cavity The process comprises the following steps, having a cavity recessed on the back side of the transfer surface with a transfer region and a vertical wall interposed therebetween, located on the back side of the resin molded product, and from the transfer region to the inside of the cavity A method for producing a molded simultaneous transfer product in which a metal insert member protruding in a frame shape is inserted.
B-1 Step of placing the placing piece and placing the insert member in the cavity formed by the front surface side mold and the back surface side mold so as to fill the space corresponding to the cavity. B Transfer layer on the substrate sheet A transfer sheet formed of
The base sheet covers a portion corresponding to the transfer region in the cavity and the surface of the placing piece,
The transfer layer is formed on a portion covering a transfer region corresponding portion on the base sheet,
The step of disposing the transfer sheet on the inner surface of the front side mold in the cavity c The front side mold and the back side mold are clamped, and a molten molding resin is injected into the cavity. Step of opening mold after cooling, solidification Step of taking out resin molded product from the cavity In the manufacturing method of the molding simultaneous transfer article according to claim 6,
The placing piece and the insert member in the step of A-1 are positioned through the boss projection provided in the placing piece through the boss hole opened in the insert member,
The step of taking out in step D includes a step of ejecting the protrusion provided on the placing piece with a first boss pushing pin to take out the placing piece, and then pushing out a resin molded product with the second molded product pushing pin. A method for producing a simultaneous molded transfer product.

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