JP2010076249A - Smc producing method - Google Patents

Abstract

The present invention provides an SMC manufacturing method capable of preventing the SMC material sandwiched between both release films from spreading in the width direction of the release film.
SOLUTION: One long release film is continuously drawn out and fed, a thermosetting resin molding material 21 is supplied onto the release film and fibers 22 are dispersed, and another long release film is supplied. The release film is continuously fed out and sent to supply the thermosetting resin molding material 21 onto the release film, and the molding material 21 on the one release film 11 and the fibers 22 on the other. The molding material 21 on the release film 12 and the release film are overlapped, and the SMC material 2 is passed between the release films by passing them continuously through a net conveyor as a pair of upper and lower impregnation devices 43. This is a manufacturing method of SMC to be sandwiched. The vicinity of both end portions in the width direction of both release films is intermittently welded over the longitudinal direction of the release films.
[Selection] Figure 1

Description

  The present invention relates to a method for producing SMC used for molding FRP or the like.

Conventionally, SMC (Sheet Molding Compound) continuously feeds and sends a long release film such as polypropylene, supplies a thermosetting resin molding material on the release film, and cuts glass roving. Disperse the glass fiber, and continuously feed out another long release film such as polypropylene, and put the release film on the molding material on the release film and the SMC material made of glass fiber. The SMC material is sandwiched between release films by stacking and passing between a net conveyor as a pair of upper and lower impregnation devices while feeding them continuously, and the sandwich sandwiched is aged for a predetermined time. .
Japanese Patent Laid-Open No. 11-123718

  Prior to maturing, as shown in Patent Document 1 (see FIG. 6), the sandwich 1 is folded and stored in a storage portion 44 made of a rectangular box-like container that opens upward. ing.

  However, in this case, since the sandwich 1 located in the lower part is heavier than the sandwich 1 located in the upper part, the SMC material 2 between the release films 11 and 12 of the sandwich 1 located in the lower part is lateral, The release films 11 and 12 spread outward in the width direction, and protruded from the end portions, and there was a concern that they would adhere to the equipment or be wasted. Moreover, even when it did not protrude, there existed a possibility that the width | variety of the SMC material 2 might spread rather than predetermined.

  Further, since the end portions of the release films 11 and 12 are separated, there is a problem that the end portions of the release films 11 and 12 are easily broken when folded in a zigzag manner.

  The present invention was invented in view of the above-described conventional problems, and the object of the present invention is to prevent the SMC material sandwiched between the release films from spreading in the width direction of the release film. It is an object of the present invention to provide a method for manufacturing SMC.

  In order to solve the above-mentioned problem, the invention according to claim 1 is to continuously feed and feed one long release film and to supply a thermosetting resin molding material 21 onto the release film. The fibers 22 are dispersed, and another long release film is continuously fed out and sent, and a thermosetting resin molding material 21 is supplied onto the release film. The molding material 21 on the other mold release film 12 and the mold release film 12 are stacked on the molding material 21 and the fiber 22, and these are continuously fed and passed between a net conveyor as a pair of upper and lower impregnation devices 43. In the manufacturing method of SMC in which the SMC material 2 is sandwiched between the two release films, the vicinity of both end portions in the width direction of the two release films is intermittently welded across the longitudinal direction of the release film. Is what .

  By adopting such a configuration, when the release films sandwiching the SMC material 2 are folded and stored in a zigzag shape, even if a large weight is applied to the SMC material 2 positioned below, the SMC material 2 is arranged in the width direction. It can be prevented from spreading.

  In the present invention, the SMC material protrudes from the end portion and adheres to the equipment or is wasted, or even if the SMC material does not protrude, a portion where the width of the SMC material is wider than a predetermined width is generated and the width is constant. It is possible to prevent such a situation from occurring.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

  As shown in FIG. 2, the SMC manufacturing process feeds a release film 11 such as a long polypropylene film wound around a roll 31 to a molding material supply device 41 while continuously feeding the release film 11 on the release film. A molding material 21 is supplied. The molding material 21 can be a thermosetting resin molding material 21 such as phenol resin, melamine resin, or unsaturated polyester resin used in FRP. It is preferable to select one, and in addition to the resin, a mixture of fillers and pigments such as calcium carbonate, aluminum hydroxide, and aerosil can be used.

  The molding material supply device 41 can be selected according to the viscosity and the supply amount (weight) of the molding material 21 to be supplied, and is formed by a backup roll, a bank plate, and a doctor roll (not shown) for feeding the release film 11. Conventionally known ones are preferably used.

  Further, a fiber cutting and spreading device 42 is disposed above the release film 11 that is continuously fed after supplying the molding material 21, and the glass fiber 22 obtained by cutting the glass roving G is used as the release film 11. It is made to spread on the molding material 21 supplied to. In this embodiment, glass fiber 22 is used as the fiber, but the fiber is not limited to glass fiber 22.

  In this way, after supplying the SMC material 2 composed of the molding material 21 and the glass fiber 22 onto the release film 11, separately from the roll 31 around which the release film 11 is wound, the long length wound around the roll 32. Another release film 12 such as a polypropylene film is continuously drawn out and sent, superimposed on the SMC material 2 on the release film 12, and further sent as a pair of upper and lower impregnation devices 43. The SMC material 2 is sandwiched between the release films 11 and 12 by passing between the net conveyors. The widths of the release films 11 and 12 are formed longer than the width of the SMC material 2 to be manufactured so that the SMC material 2 does not protrude from the ends of the release films 11 and 12. The width of the release films 11 and 12 is 1500 mm with respect to the width of 1200 mm.

  Then, the sandwiched product 1 is stored in a folded manner in a storage unit 44 made of a rectangular box-like container or the like that opens upward, and aged in a maturing box 45.

  After aging in the aging box 45, as shown in FIG. 3, the sandwich 1 in the container is unwound and fed, and the release films 11 and 12 on both sides are removed from the sandwich 1 by the release film winding device 51. The release films 11 and 12 are peeled off and taken up on a take-up roll, and the sheet-like SMC material 2 is cut into SMC pieces 20 each having a required length in the longitudinal direction by a cutting blade of a cutting device 52. The fragments 20 are supplied to the FRP compression molding apparatus 53 for molding.

  In the present invention, when the sandwich 1 is formed, the vicinity of both end portions in the width direction of the release films 11 and 12 is intermittently welded across the longitudinal direction of the release films 11 and 12, respectively. In this embodiment, welding is performed by the welding device 6.

  As shown in FIG. 4, the welding device 6 is installed on the downstream side of the impregnation device 43, and the upper surface is formed on a part 61 on which the sandwich 1 is sent and a part of the surface of the part 61. The opening 62, the ultrasonic welding machine 7 installed on the upper side of the opening 62, and the feeding jig 63 installed on the lower side of the opening 62 are configured.

  In the ultrasonic welding machine 7, a welding machine main body 71 is installed above the opening 62 of the base 61, and a welding part 72 for ultrasonic welding the release films 11 and 12 to be welded is an opening 62 of the base 61. Placed inside. The feeding jig 63 is a rotating body having a circular cross section that rotates in the feeding direction of the release films 11 and 12, and the release films 11 and 12 that are in contact with the welded portion 72 are attached to the surface of the rotating body. A welding support portion 65 to be supported is formed. A plurality of concave portions 64 are provided at predetermined intervals in the circumferential direction on the surface of the rotating body, and the surface of the convex portion between the concave portion 64 and the concave portion 64 is used as a welding support portion 65. The circumferential length of the welding support part 65 (convex part) is about 5 mm. The welding support portion 65 is disposed below the welding portion 72 in the opening 62 of the base portion 61. The rotating body is driven by a driving means such as a motor, and rotates so that the portion of the welding support portion 65 that is in contact with the release films 11 and 12 moves at the same speed as the feed speed of the release films 11 and 12. To do.

  The ultrasonic welder 7 is provided such that the opening 62, the welded portion 72, and the welded support portion 65 are positioned in the vicinity of both ends in the width direction of the release films 11 and 12. Needless to say, the ultrasonic welding machine 7 may have the opening 62, the welding portion 72, and the welding support portion 65 at two locations.

  In addition, an outside detection sensor 67 that detects when the SMC material 2 protrudes is provided on the outer part of the end portions of the release films 11 and 12 of the base 61, and the device is installed when the protrusion is detected. It is possible to stop and deal with it.

  The welding process in the welding apparatus 6 will be described. The sandwich 1 is sent to the upper surface of the base 61 and the release films 11 and 12 are pressed against the upper surface of the base 61 by the film pressing roll 66. In the opening 62, the two release films 11 and 12 are sandwiched between the welding portion 72 and the welding support portion 65. The welding support portion 65 rolls on the lower surface of the release film 12 to be sent, and the welding portion 72 comes into contact with the upper surface of the release film 11 of the contacting portion from above and is sandwiched between the welding support portion 65 and The ultrasonic wave is generated and the sandwiched portion is welded. Since the concave portions 64 are formed at predetermined intervals on the surface of the rotating body, when the concave portion 64 is located in a portion sandwiched between the welding support portion 72 and the welding support portion 65, the release films 11 and 12 are welded. Is not done. For this reason, it welds intermittently over the longitudinal direction of the release films 11 and 12.

  As described above, by sandwiching the vicinity of both end portions in the width direction of both release films 11 and 12 over the longitudinal direction of the release films 11 and 12, the sandwich 1 is stacked in a zigzag manner. The SMC material 2 can be prevented from spreading in the width direction even when a large weight is applied to the sandwich 1 located below. As a result, the SMC material 2 sticks out of the end and sticks to the equipment or is wasted, or even if the SMC material 2 does not stick out, a portion where the width of the SMC material 2 is wider than a predetermined width is generated and the width is not constant It is possible to prevent the appearance of the sandwich 1 from being packed, and the usability when using the SMC material 2 is improved. Moreover, it can prevent that a product becomes non-uniform | heterogenous by the fluctuation | variation of the ratio of the molding material 21 and the fiber 22 by the edge part of the SMC material 2 spreading in the width direction.

  Further, since the release films 11 and 12 are intermittently welded over the longitudinal direction, volatile styrene gas or the like can be discharged from the gap between the welded portions 13, and the volatile gas is filled. Thus, the release films 11 and 12 are prevented from bursting. In addition, when volatile gas does not generate | occur | produce, you may weld continuously over the longitudinal direction of the release films 11 and 12. FIG.

  Moreover, in this embodiment, since the length of the welding part 13 of the release films 11 and 12 is about 5 mm each, when the sandwich 1 is folded in a zigzag form, each welding part 13 is not broken.

  Further, since the end portions of the release films 11 and 12 are not separated, the end portions of the release films 11 and 12 are not inadvertently folded when folded in a zigzag manner.

It is a perspective view of the sandwich thing formed by pinching | interposing the SMC material in this invention with a release film. It is a schematic explanatory drawing explaining the manufacturing process of SMC. It is explanatory drawing at the time of peeling a release film from a sandwich thing and supplying to a shaping | molding apparatus. It is a schematic perspective view of a welding apparatus. It is sectional drawing of the storage part which folded and stored the sandwich thing in the shape of a spell. It is sectional drawing of the accommodating part which folded and stored the conventional sandwich thing in the shape of a spell, (a) is a sectional side view seen in the width direction of the sandwich thing, (b) is the direction orthogonal to (a) It is the sectional side view seen from.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sandwich thing 11 One release film 12 Other release films 13 Welding part 2 SMC material 20 SMC fragment 21 Molding material 22 Fiber 31 Roll 32 Roll 41 Molding material supply apparatus 42 Fiber cutting and spraying apparatus 43 Impregnation apparatus 44 Storage part 45 Aging warehouse 51 Release film winding device 52 Cutting device 53 Compression molding device 6 Welding device 61 Base portion 62 Opening portion 63 Feeding jig 64 Recessed portion 65 Welding support portion 66 Film pressing roll 67 Protrusion detection sensor 7 Ultrasonic welding machine 71 Welding Machine body 72 Welding part G Glass roving

Claims (1)

  One long release film is continuously drawn out and sent, and a thermosetting resin molding material is supplied onto the release film and fibers are dispersed, and another long release film is continuously provided. Then, the thermosetting resin molding material is supplied onto the release film, and the molding material on the one release film and the molding material on the other release film on the fiber are separated from the release film. In the manufacturing method of SMC in which the SMC material is sandwiched between the two release films by superimposing the mold films and passing between the net conveyors as a pair of upper and lower impregnation devices while continuously feeding them, the width of both release films A method for producing SMC, characterized in that the vicinity of both ends in the direction is intermittently welded over the longitudinal direction of the release film.

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