JPH10138243A - Sheet forming device for resin material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform a kneading operation and a sheet forming process with a single unit of device by selecting between these steps. SOLUTION: This sheet forming device is equipped with an extruder 2 for a kneading material to be supplied, a pair of upper/lower rolls 3, 4 arranged on the delivery side of the extruder 2 and a transfer mechanism 5 for the material to be fed out of the rolls 3, 4. The transfer mechanism 5 has a returning means for returning the kneading material to be fed out of he rolls 3, 4 to the extruder 2 side and a switching means for switching from the returning means to a feeding means for feeding the material to a next step. Thus it is possible to select between the operation to return the kneading material to the extruder 2 and knead it and the operation to form the kneading material into a sheet-like product with the help of the rolls 3, 4 and feed the sheet-like product to be transferred to a next step.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet forming apparatus for kneading various thermoplastics, rubbers and the like (hereinafter simply referred to as a resin material) with a kneading machine and forming them into a sheet.

[0002]

2. Description of the Related Art As a method of forming a kneaded thermoplastic resin material into a sheet, there are a method of forming with a pair of rolls together with an extrusion forming method and a method of using a rolling roll. The former is a method in which a die is provided at the tip of an extruder and formed into a sheet by passing through a slit formed in the die. In this method, there is a problem that the material remains in the die at the end of the operation and it is difficult to remove the material.

On the other hand, in the latter method using a rolling roll, the removal and cleaning of the residual material when the operation is stopped can be performed relatively easily. As an apparatus for forming a sheet of the resin material, for example, there is an apparatus disclosed in Japanese Patent Publication No. 42331/1990. The outline is shown in FIG. 2 and FIG. The molding apparatus 50 includes a twin-screw extruder 51, and a casing 52 of the extruder 51 has a material inlet 53 formed at an upper portion and accommodates two cone-shaped screw rolls 54 and 55 therein. The rolls 54 and 55 are provided so that the leading ends thereof are lower, are rotated in opposite directions, sequentially extrude the supplied material, and form a pair of biaxial rolling rolls 56 provided adjacent to the leading ends thereof. 57. However, the lower rolling rolls 56 are provided close to each other so that the extrusion direction of the material substantially forms a tangent, and the upper rolls 57 are provided so as to be located behind with a slight distance therebetween. A material accumulation space 58 is formed between the tip of the cone type screw roll and side plates 60 on both sides.
Deploy 61. The distance between both side plates determines the sheet width to be formed. 62 denotes an elevating mechanism of the upper rolling roll 57,
The distance between the upper rolling roll 57 and the lower rolling roll 56, that is, the thickness of the sheet to be formed is adjusted.

[0004] The material extruded by the screw rolls 54, 55 is then fed to upper and lower rolling rolls 56, 57.
Is formed into a sheet Wa having a predetermined width, and is sent to the next step by the sending conveyor 63.

[0005]

The extruder 51 includes:
Materials kneaded in advance by a kneading machine are supplied, but depending on the purpose of use, further additives may be added, or kneading may be required even if no additives are required. In this case, when the amount is small, manual kneading is usually performed using two rolls. The outline is shown in FIG. The kneading machine 70 is mainly composed of two rolls 71 and 72, and the material W kneaded by hand is charged, and the rolls 71 and 72 have a slight difference in rotation speed, and perform kneading by a rotation difference. The kneaded material that has come out is again manually rolled through the two rolls 7 via the guide roll 73 arranged on the upper part.
Kneading is repeated by supplying between 1 and 72.

After the completion of the predetermined kneading, it is cut by the cutter 74 and sent to the next step.

[0007] However, this work is extremely poor workability,
There is a problem that there is a danger, work in a bad environment where the powder of the additive or the like is scattered, and furthermore, skill is required. In view of such a point, the present invention selects and switches between sheet forming and sheet forming together with the above-described re-kneading operation, and performs switching by using a single device, thereby improving the work efficiency and quality. An object is to provide a molding device.

[0008]

According to a first aspect of the present invention, there is provided a sheet-like resin material forming apparatus for extruding a kneaded material to be supplied, and a discharge opening of the extruder. A pair of upper and lower rolling rolls disposed adjacent to each other, and a transfer mechanism for transferring the material unwound by the rolling rolls. The transfer mechanism returns the kneaded material fed from the rolling rolls to the extruder side. A kneading operation comprising: a returning unit and a switching unit for sending out the kneading material to a next step; kneading the kneading material by a pair of rolling rolls; returning the kneading material to an extruder; and repeating kneading. The method is characterized in that the material is formed into a sheet by a rolling roll, and a sheet-like formed material feeding operation to be transferred to the next step is selected and switched.

The apparatus for forming a sheet of resin material of the present invention having the above-described structure kneads the kneaded material supplied to the extruder with a pair of rolling rolls, returns the kneaded material by a transfer mechanism, and re-mixes the kneaded material. Perform kneading. After the completion of the predetermined kneading, the sheet-shaped formed material is sent out to the next step by the rolling roll by switching the transfer mechanism.

According to a second aspect of the present invention, the transfer mechanism comprises a delivery conveyor provided on the discharge side of the rolling roll, and a return conveyor for returning the kneaded material transferred by the conveyor to the extruder side, The feed conveyor is characterized in that it can be pivoted about a rolling roll by a rotating mechanism, and a kneading material cutting cutter is provided at an appropriate position.

According to the present invention having the above-mentioned structure, the feed-out conveyor is configured to be swingable about the rolling roll side by a rotating mechanism as a switching means. Moving the cutter in the width direction of the sheet-shaped molding material by slightly separating the sheet-shaped molding material, cutting the sheet-shaped molding material, and then rotating the delivery conveyor in the delivery direction opposite to the extruder side. Is easily performed.

A third invention is characterized in that the upper and lower rolling rolls switch between a different rotation speed for mixing and kneading and a constant speed rotation for feeding as a sheet.

According to the present invention having the above-described structure, it is possible to easily select between kneading and sheet forming by adjusting the rotation speed of the rolling roll.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to FIG. In the figure, a resin material sheet forming apparatus 1
It comprises a shaft type cone extruder 2, a pair of rolling rolls 3 and 4 arranged in a material extruding section by the extruder, and a transfer mechanism 5 for transferring material unwound from the rolling rolls 3 and 4.
The extruder 2 and the rolling rolls 3 and 4 have the same structure as the above-mentioned known structure, and a description thereof will be omitted. In the drawing, reference numeral 6 denotes a material input port of the extruder 1, reference numeral 7 denotes a cone type screw roll, and the roll 7 is a pair, but is not shown. The extruder is not limited to the twin-screw type, and may be a single-screw or three-screw or more.

The transfer mechanism 5 has a feed conveyor 10 provided with one end close to the lower rolling roll 3, a rotating mechanism 11 for the conveyor 10, and a discharge side connected to the conveyor 10 for discharging the material of the extruder 2. A return conveyor 12 is provided to extend to the inlet 6 side. Numeral 13 denotes a cutting cutter which is mounted in place and is located outside the sheet material which is normally fed. The delivery conveyor 10 is slightly shifted from a return position, which is tilted upward by a rotation mechanism 11 about a drive shaft 14 on the side of the rolling roll 4, and a discharge position indicated by a chain line, and a return position for cutting the material to be further conveyed. It is also swung to the separated position. That is, the rotating mechanism 11 constitutes a means for switching the feeding direction of the kneaded material or sheet molding material. Reference numeral 15 denotes a guide roller for sending out the material transferred by the delivery conveyor 10 to the return conveyor 12, and reference numeral 16 denotes a delivery roller. Reference numeral 17 denotes a jamming plate for preventing the material delivered from the delivery conveyor 10 from passing over the delivery roller 16.

Reference numeral 18 denotes an oscillating roller for detecting the feeding speed of the kneaded material sent from the rolling rolls 3 and 4, which is mounted so as to oscillate up and down around a fulcrum 19, and the position thereof is appropriately set. It is detected by the detecting means. When the transfer speed of the return conveyor 12 is higher than the transfer speed of the feed conveyor 10, the swing roller 18 moves upward as indicated by a dotted line, and after being detected by appropriate detection means, the transfer speed of the return conveyor 12 Lower. Conversely, when the transfer speed of the return conveyor 12 is low, the swing roller 18 moves downward, and when the transfer is detected, the transfer speed of the return conveyor 12 is increased. Note that the change in the transfer speed may be performed by the delivery conveyor 10. In the above configuration, the feed conveyor 10 is usually at the position shown in the figure, and the material W kneaded by an appropriate kneader is charged from the material input port 6 of the extruder 2,
Rolled by rolls 3, 4
Send out to the side. The fed material is kneaded by the rolls 3 and 4. At this time, by making the rotation speeds of the two rolls different, the material is subjected to a shearing action and the kneading is effectively performed. Although the adjustment of the rotation speed is not shown, each roll is rotated at an arbitrary speed for obtaining the optimum kneading for each kneading material by a single driving mechanism or a transmission mechanism.

The kneaded material is guided by an oscillating roller 18, supplied onto a delivery conveyor 10, transported upward by the conveyor 10, transferred to a return conveyor 12 by a guide roller 15, and extruded. The material is returned to the material input port 6 and the kneading is repeated.

After the completion of the predetermined kneading operation, the rolling rolls 3 and 4 are rotated at the same speed, fed out as a sheet having a predetermined thickness, the feed conveyer 10 is slightly separated from the sheet material, and the cutter 13 is moved to the sheet material. The material is moved in the width direction to cut the material (at this time, the material is formed in a sheet shape). At this time, the rolling rolls 3 and 4 and the delivery conveyor 10 are temporarily stopped, and the return conveyor 1 is stopped.
It is preferable to apply tension to the formed sheet by driving only 2. Next, the delivery conveyor 10 is rotated to the position indicated by the dashed line, and the sheet material is delivered to the next step.

When re-kneading is not required, it is a matter of course that the delivery conveyor 10 is held at the position of the chain line and used as a normal sheet forming apparatus.

[0020]

As described above, according to the present invention, the kneaded material is returned by the transfer mechanism, the kneading operation is performed again, and the kneaded material is switched into a sheet form by switching the transfer mechanism. Can be selected and performed by the same machine, and the quality and work efficiency can be improved. According to the second aspect of the present invention, since the transfer mechanism switches the delivery conveyor between the return position and the delivery position by the switching means, the switching to the delivery position can be quickly performed. According to the third aspect of the present invention, the kneading can be performed effectively by making the rotation of the pair of rolling rolls different from each other for the kneading, so that the kneading can be performed at the same rotation speed. Accordingly, two types of operations that can smoothly perform feeding in a sheet shape can be performed.

[Brief description of the drawings]

FIG. 1 is an overall longitudinal sectional view of a resin material sheet forming apparatus of the present invention.

FIG. 2 is a longitudinal sectional view of a conventional sheet forming apparatus.

FIG. 3 is an explanatory view of a screw arrangement of the extruder in FIG. 2;

FIG. 4 is an explanatory view of a conventional two-roller kneader.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sheet-shaped forming apparatus of resin material 2 Extruder 3 Rolling roll 4 Rolling roll 5 Transfer mechanism 10 Sending-out conveyor 11 Conveyor rotating mechanism 12 Returning conveyor

Claims (3)

[Claims] 1. An extruder for extruding a supplied kneaded material, a pair of upper and lower rolling rolls disposed adjacent to a discharge opening of the extruder, and a transfer of the material fed by the rolling rolls. A transfer mechanism for returning the kneaded material fed from the rolling rolls to the extruder side, and a switching means for sending out the kneaded material to the next step. The kneading operation is repeated by kneading with a rolling roll that forms a kneading material and returned to the extruder to repeat kneading, and the kneading material is formed into a sheet by a rolling roll, and a sheet-like molding material feeding operation to be transferred to the next process is selected and switched. A sheet-like molding device for a resin material. 2. The transfer mechanism comprises a delivery conveyor provided on the discharge side of the rolling rolls, and a return conveyor for returning the kneaded material transferred by the conveyor to the extruder, wherein the delivery conveyor rotates. 2. The apparatus for forming a sheet of resin material according to claim 1, wherein the apparatus is configured to be swingable about a rolling roll side by a mechanism, and a kneading material cutting cutter is provided at an appropriate position. 3. The method according to claim 1, wherein the upper and lower rolling rolls are switched between different rotation speeds for kneading and constant rotation for feeding out the sheet. Sheet molding equipment for resin material.