JPS5954008B2 - Injection extrusion molding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for manufacturing a molded product made of a sheet-like body such as a fender liner for an automobile, and an apparatus for extruding a sheet using plasticized resin and forming the sheet on the same line. This is what we provide.

When a wide belt-shaped sheet is sequentially formed in a molding machine and trimmed to obtain a product, the sheet cannot be conveyed during molding, so if the sheet is extruded continuously, extrusion and molding are performed on the same line. This becomes difficult.

The present invention provides an apparatus in which a sheet is intermittently extruded by an injection device and molded when the sheet is stopped, and one embodiment thereof will be described below with reference to the drawings. 1 is an injection device, 2 is a drive unit that drives the injection device 1, and a die 3 for extruding a wide sheet M is connected to an adapter 1a at the front of the injection device 1 via a shutter-off valve 4. There is.

The injection device 1 heats and plasticizes materials such as resin waste inputted from a hopper 5, and injects the material from an adapter 1a. Plasticization and injection are performed intermittently for each unit length of sheet M required for one molding to be extruded.
The injection speed can be freely adjusted, and is adjusted so that undulations do not occur at the lip of the die 3 during injection extrusion. Moreover, it is preferable that the injection speed can be adjusted in several stages during injection extrusion. Shutoff valve 4
has the function of opening and closing the injection flow path as well as applying vacuum suction to the flow path on the side of the die 3. A steel belt type sheet conveying device 6 is provided in front of the die 3, and a clip type sheet conveying device 7 extends from an intermediate position thereof.

Further, a forming machine 8 is installed at an intermediate position of the clip-type sheet conveying device 7. These steel belt type sheet conveyance device 6 and clip type sheet conveyance device 7 are driven in synchronization with the injection extrusion speed of the sheet width, and stop when sheet extrusion stops. The steel belt type conveyance device 6 has an endless steel belt wrapped around a roller 6a to rotate it, and is preferably installed on both the top and bottom surfaces of the sheet M, but may be installed only on the bottom surface. The steel belt type conveying device 6 is provided with a temperature control unit 9 that controls the temperature of the conveyor surface from the back side. The clip conveying device 7 is constructed by connecting a large number of clips 7a that hold the edges of the sheet M in an endless chain, and hanging the clips 7a on a sprocket 10 to drive them in a horizontal plane.
It is installed along both sides of the sheet M. The clip 7a is biased by a spring so as to be closed at all times, and a clip opener for opening the clip 7a is provided at the front end of the clip-type conveying device 7, that is, at a position close to the molding machine 8. The molding machine 8 includes a convex lower mold 11 and a concave upper mold 12.
and corresponding to the upper and lower surfaces of the sheet M.

These lower mold 11 and upper mold 12 are attached to a guide column 13 so as to be movable up and down, and are moved up and down by driving cylinder devices 14 and 15. The molding machine 8 is of a vacuum or compressed air type, and the upper mold 12 or the lower mold 11 is provided with a nozzle connected to a suction device or a pressurized air supply device.
A trimming press 16 and a sheet winding machine 17 disposed following the trimming press 16 are provided in front of the forming machine 8.
The trimming press 16 cuts the molded portion m of the sheet M to obtain a product, and includes cylinder devices 18 and 19.
It has trimming blades 20 and 21 that are driven up and down. The trimming press 16 is provided with a carry-out device that carries out the product in a direction a perpendicular to the running direction of the sheet M. Next, the operation of the above configuration will be explained.

The injection device 1 intermittently injects plasticized resin, and the die 3 extrudes a sheet M in units of length. At this time, the shut-off valve 4 performs vacuum suction immediately after closing each time injection and extrusion is completed, thereby preventing excess resin from dripping from the lip portion of the die 3. The sheet M extruded from the die 3 is fed into a molding machine 8 by a Stiebelt type conveyor 6 and a clip type conveyor 7 in synchronization with the injection extrusion speed. While the sheet M is being conveyed by the steel belt type sheet conveying device 6, the temperature control unit 9 adjusts the temperature from the injection extrusion temperature to the molding temperature. The molding machine 8 molds the sheet M when the sheet M is stopped, that is, when injection extrusion is stopped. After molding, injection extrusion is performed, and the molded part m discharged from the molds 11 and 12 is sent to a trimming press 16 and cut into a predetermined shape. At this time, the next molding is simultaneously performed at the rear position. The cut-out product is carried out in the direction of arrow a, and the remaining sheet portion is wound up on the sheet machine 17 in a continuous state. The rolled sheet is not disposed of as waste and is reused. As explained above, according to the present invention, since the injection extrusion of the sheet is performed intermittently, the extruded wide sheet can be molded as it is on the same line, and a good product can be obtained.

In particular, the present invention is provided with an injection device that intermittently injects resin to a winding means that winds up the remaining sheet portion cut out by the trimming press on the same line, and the predetermined shape cut out by the trimming press. Since the product is carried out from the trimming press in a direction perpendicular to the line, the process from injecting the resin and extruding the sheet to transporting the product and winding up the remaining sheet can be carried out efficiently. In addition, the sheet conveyance device is equipped with an adjustment means that adjusts the temperature of the sheet fed into the molding machine between the die and the molding machine to the molding temperature, so that the molding machine can perform molding accurately and produce good products. It will be done.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, with the first figure being a front view and the second figure being a front view.
The figure is a plan view. DESCRIPTION OF SYMBOLS 1... Injection device, 3... Dice, 4... Shut-off valve, 6... Steel belt type sheet conveyance device, 7... Clip type sheet conveyance device, 8... Molding machine, 9 ...Temperature control unit, 16...Trimming press, M...Sheet.

Claims (1)

[Claims] 1. An injection device that intermittently injects resin, a die connected to this injection device that extrudes a sheet, a sheet delivery device that intermittently conveys the extruded sheet in synchronization with extrusion, and a sheet conveyance device that intermittently conveys the extruded sheet in synchronization with the extrusion. A forming machine that forms when stopped, a trimming press that cuts out a sheet formed by this forming machine into a predetermined shape, and a winding means that winds up the remaining sheet portion cut out by this trimming press are provided on the same line, and A product having a predetermined shape cut out by the trimming press is carried out from the trimming press in a direction perpendicular to the line, and the sheet conveying device has a sheet conveyed between the die and the molding machine to be fed into the molding machine. An injection extrusion molding apparatus characterized by being provided with a temperature control means for adjusting the temperature to a molding temperature.