JPH0822550B2 - Defoaming device in sheet material molding device, wire mesh belt and pressing roller used in the device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention is mainly directed to SMC (Sheet Molding Compound,
In a sheet-material molding apparatus for molding a fiber-reinforced sheet molding material, the present invention relates to a defoaming apparatus for removing air bubbles between sheet bodies, and a wire mesh belt and a pressing roller used in the apparatus.

[Conventional technology]

SMC is a type of FRP (Fiber glass Reinforced Plastic), which is an unsaturated polyester resin, filler (calcium charcoal, etc.), mold release agent, catalyst, pigment, etc. It is a sheet-shaped material for press molding that is chemically thickened by impregnating
Because of its features such as high productivity, high strength and good surface property, it is used for forming molded products such as bathtubs and cooling towers by press working. And this
In the case of producing SMC, after applying a resin on the upper surface of a continuous polyethylene film, sprinkle a reinforcing material (for example, glass fiber) on the applied surface,
On top of that, another continuous polyethylene film coated with a resin is laminated to form an integral body. The two polyethylene films formed in this way and the resin coating layer-the strip-shaped reinforcing material-the resin coating layer inside the polyethylene film are integrally compressed to form the strip-shaped reinforcing material, Randomly moved to the upper and lower resin coating layers and impregnated into them to form a reinforced sheet.

[Problems to be Solved by the Invention]

By the way, as described above, when two continuous polyethylene films are put together and the resin having glass fibers inside is sandwiched, it is necessary to push out the bubbles remaining inside. For this reason, conventionally, a cylindrical roll having a spirally wound winding is used, and as shown in FIGS. 8 and 9, when the two polyethylene films 2 are combined, By rotating the winding roll 1 on it, air bubbles are pushed out from both ends of the polyethylene film 2, but when the conventional winding roll 1 is used, two polyethylene films 2 are formed.
There is a possibility that a large amount of air bubbles will be generated when they are combined with each other, and that the winding causes the resin 3 to be pushed out to both ends together with the air bubbles and the surface of the polyethylene film to be roughened. Further, if the pressing force and rotation of the winding roll are reduced to prevent this, there is a problem that the defoaming effect cannot be sufficiently obtained.

The present invention has been made in view of the above circumstances, and an object thereof is to prevent bubbles from being generated when a resin is sandwiched between two continuous sheet bodies, and in addition, Bubbles generated inside can also be easily pushed out from both ends of the sheet body, the resin inside both sheet bodies is not pushed out, and wrinkles etc. do not occur on the surface of the sheet body. It is an object of the present invention to provide a foam device, a wire mesh belt and a pressing roller used in the device.

[Means for solving the problem]

In order to achieve the above object, the present invention provides an endless defoaming method in which one of the sheet members of a sheet material obtained by filling a resin having reinforcing fibers between two continuous sheet members is in contact with the sheet member. Rollers for the wire mesh belt for use in a state where the wire engaging portion and the linear portion in the traveling direction are accommodated in the annular groove portions of the plurality of supporting rollers and which are pressed by contacting and pressing the other sheet body. Are arranged so that the pressing portions are made larger one after another.

Further, the defoaming wire mesh belt is configured such that a plurality of wires are engaged with each other to form a mesh body composed of a traveling-direction linear portion, an orthogonal-direction linear portion, and a wire engaging portion, and the wire engaging member. The pitch of the joining portion is set longer in the direction orthogonal to the advancing direction of the sheet material than in the advancing direction of the sheet material, and the wire engaging portion and the advancing direction linear portion are planes formed by the orthogonal linear portions. It is configured to be concave.

Further, the pressing roller is formed such that a cylindrical sheet contact portion is formed in the center thereof and both end portions are reduced in diameter from the sheet contact portion.

[Action]

In the defoaming device in the sheet material molding apparatus of the present invention, by the wire mesh belt supported by the support roller in a state where the wire engaging portion of the wire mesh belt and the traveling direction linear portion are housed in the annular groove portion of the support roller. , While supporting one sheet body and pressing the other sheet body by the pressing roller so that the pressing area of the sheet body increases sequentially, the bubbles in the two sheet bodies are smoothly pushed toward the left and right ends. .

Further, in the defoaming wire mesh belt of the present invention, the sheet material is supported by the orthogonal direction linear portion orthogonal to the traveling direction of the sheet material, and the traveling direction linear portion and the wire engaging portion are formed from the sheet material. By evacuating,
It is easy to guide bubbles in the sheet material in a direction orthogonal to the traveling direction.

Further, in the defoaming pressure roller of the present invention, both ends thereof have a diameter smaller than that of the central sheet contact portion, so that by sequentially using a sheet contact portion having a long length, it is possible to form air bubbles into a sheet. The material can be smoothly extruded from the center to both ends.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 7.

FIG. 1 is a schematic configuration diagram showing an example of an SMC sheet material molding apparatus incorporating the defoaming apparatus of the present invention. In the figure, reference numeral 10 is a lower polyethylene film roll around which a polyethylene film 11 is wound, and the polyethylene film 11 supplied from the lower polyethylene film roll 10 is installed on a frame 13 via a guide roller 12. Further, it is placed on the defoaming wire mesh belt 14 and conveyed. The defoaming wire mesh belt 14 is an endless belt stretched between the pair of rotating rollers 15a and 15b. Further, between the guide roller 12 and the rotary roller 15a on the upstream side, above the frame 13, a coating device (doctor blade) for coating the upper surface of the lower polyethylene film 11 with the resin A.
A cutting device (roving cutter) 16 is installed, which is downstream of the rotary roller 15a on the upstream side and above the frame 13 to cut the glass fiber B and supply it onto the lower polyethylene film 11. ) 17 are arranged. Then, on the downstream side of the cutting device 17, an upper polyethylene film roll 19 wound with an upper polyethylene film 18, a coating device (doctor blade) 20 for coating the resin A on the surface of the upper polyethylene film 18,
Guide roller 2 for guiding the upper polyethylene film 18
1,22 and are installed. Furthermore, this guide roller 22
A plurality of support rollers 23 for supporting the wire mesh belt 14 are provided below the lower polyethylene film 11 on the downstream side of the upper polyethylene film 18;
Above, supporting the upper polyethylene film 18,
A plurality of pressing rollers 24 that press downward are arranged to face each other. Furthermore, each roller 23,2 above
The pair of polyethylene films 1 on the downstream side of 4
A plurality of impregnating rollers 25, 26 are provided above and below 8, 11, respectively.
Are staggered and these impregnation rollers 2
A pair of upper and lower wire mesh belts for impregnation 27, 28 for pressing the space between the polyethylene films 18, 11 to impregnate the resin A into the glass fiber B are arranged between the spaces 5, 5.
And these wire mesh belts for impregnation 27,28
Is an endless belt in the form of a woven fabric (herringbone type, herringbone type), and is stretched between a pair of rotating rollers 29 and between a rotating roller 30 and a driving roller 31, respectively. Further, a drive motor 22 is connected to the drive roller 31, the drive motor 32 conveys the impregnating wire mesh belt 28, and the detachment is performed via the rotary roller 30 and the rotary roller 15b on the downstream side. The foam wire mesh belt 14 is conveyed, and the impregnating wire mesh belt 27 is also conveyed as the impregnating wire mesh belt 28 moves. The reference numeral 33 is a winding roll for winding the finished sheet material 34.

As shown in FIGS. 3 to 5, the defoaming wire mesh belt 14 includes a large number of wires 14a bent in a rectangular wave shape and engaged with each other.
The orthogonal direction linear portion 14b of the direction orthogonal to the traveling direction, the wire engaging portion 14c bent downward from the orthogonal direction linear portion 14b, and the traveling direction of the sheet material 34 from the lower end of the wire engaging portion 14c. The extending straight line portion 14d in the traveling direction is repeatedly configured. And adjacent wires
The wire engaging portions 14c of 14a are engaged with each other to form a mesh body 14e having a rectangular mesh. Therefore, the pitch of the wire engaging portion 14c is set to be longer in the direction orthogonal to the traveling direction of the sheet material 34 than in the traveling direction, and the wire engaging portion 14c and the traveling direction linear portion 14d are It is housed in a plurality of annular groove portions 23a formed on the outer circumference of each of the support rollers 23 so as to be recessed below the upper surface formed by the orthogonal linear portions 14b.

As shown in FIGS. 6 and 7, the pressing roller 24 has a cylindrical sheet contact portion 24a formed at the center thereof, and both end portions 24b are reduced in diameter toward the outside from the sheet contact portion 24a. It has a conical shape. The length of the sheet contact portion 24a of each pressing roller 24 is set longer from left to right in FIG. 6 (from upstream to downstream). The rightmost pressing roller 24 in FIG. 6 has only the sheet contacting portion 24a, and the conical end portions are not formed.

When molding the SMC sheet material 34 using the sheet material molding device incorporating the defoaming device configured as described above, first, the lower polyethylene film 11 from the lower polyethylene film roll 10 to the guide roller 12 To the coating device 16 through which the resin A is coated on the upper surface of the lower polyethylene film 11 and then the lower polyethylene film 11 is defoamed by a wire mesh belt.
Place it on 14 and transfer it to the downstream side. Then the cutting device 17
The glass fiber B cut by is supplied onto the lower polyethylene film 11 and then sent to the defoaming section.

On the other hand, a coating device 20 is provided on the surface of the upper polyethylene film 18 supplied from the upper polyethylene film roll 19.
After the resin A is applied by the guide rollers 21 and 22, the resin A is sent to the defoaming section.

Then, in this defoaming portion, the upper surface of the lower polyethylene film 11 to which the resin A and the glass fiber B are attached and the upper surface of the upper polyethylene film 18 to which the resin A is attached (lower surface) are integrated together. In this case, each pressing roller pressing from above the upper polyethylene film 18
Since the sheet contact portions 24a of 24 are sequentially set to be larger, when the upper and lower polyethylene films 18 and 11 are combined, they are sequentially pressed outward from the central portion, and thus air bubbles are sealed in both polyethylene films 18 and 11. It is rare to get caught. In addition, since the pressing area gradually expands outward, the air bubbles generated between the polyethylene films 18 and 11 should be pushed to both ends and removed. At this time, the defoaming wire mesh belt 14 supporting the lower polyethylene film 11 from the lower side,
While supporting the lower polyethylene film 11 by the orthogonal direction linear portion 14b, since the wire engaging portion 14c and the advancing direction linear portion 14d are housed in the annular groove portion 23a of the support roller 23, the pressing roller 24 Bubbles pushed out to both end sides of both polyethylene films 18 and 11 by the action are smoothly guided along the orthogonal direction linear portion 14b, and the wire engaging portion 14c and the traveling direction linear portion 14d are the lower polyethylene. It does not touch the film 11 and does not interfere with the movement of the bubbles. Further, by accommodating the wire engaging portion 14c and the traveling-direction linear portion 14d in the annular groove portion 23a of the support roller 23, it is possible to prevent the defoaming wire mesh belt 14 from meandering.

Subsequently, while removing air bubbles in the defoaming unit, the integrated sheet material 34 is moved up and down by the impregnating rollers 25 and 26 arranged up and down until the thickness (20 mm) becomes 3 to 8 mm. By being pressed, the glass fiber B in both polyethylene films 11 and 18 is sufficiently impregnated with the resin A.
Then, the SMC sheet material 34 thus manufactured is wound around the winding roll 33.

As described above, in the defoaming portion, it is possible to smoothly expel air bubbles from both end portions of both polyethylene films 11 and 18, so that it is not necessary to apply a large force above a predetermined level to both polyethylene films 11 and 18, therefore , Sheet material
The surface of 34 is wrinkled or the resin is sheet material 34
There is no problem of protruding from both ends of the. As a result, when the formed sheet material is press-molded in the subsequent pressing step, it is possible to prevent the occurrence of defects caused by bubbles, and the surface is smooth and stable with a predetermined strength. A quality molded product is obtained.

〔The invention's effect〕

INDUSTRIAL APPLICABILITY As described above, the present invention is an endless defoaming wire that comes into contact with the one sheet member of the sheet material obtained by filling the resin having the reinforcing fiber between the two continuous sheet members. The mesh belt is supported by the support roller in a state in which the wire engaging portion and the linear portion in the traveling direction are housed in the annular groove portions of the plurality of support rollers, and the plurality of pressing rollers that contact and press the other sheet body are Since it is arranged so that the pressing portion can be successively increased, by the wire mesh belt supported by the support roller in a state where the wire engaging portion of the wire mesh belt and the linear portion in the traveling direction are housed in the annular groove portion of the support roller. , While supporting one sheet body, by the pressing roller,
By pressing the other sheet body so that the pressing area of the sheet body increases in sequence, bubbles in the two sheet bodies can be smoothly pushed out toward the left and right ends, and two continuous sheet bodies can be pushed out. It has an excellent effect that bubbles are less likely to be generated when the resin is sandwiched between the sheets, the resin inside the sheet body is not pushed out, and wrinkles are not formed on the surface of the sheet body.

Further, the defoaming wire mesh belt is configured such that a plurality of wires are engaged with each other to form a mesh body composed of a traveling-direction linear portion, an orthogonal-direction linear portion, and a wire engaging portion, and the wire engaging member. The pitch of the joining portion is set longer in the direction orthogonal to the advancing direction of the sheet material than in the advancing direction of the sheet material, and the wire engaging portion and the advancing direction linear portion are planes formed by the orthogonal linear portions. Since it is configured to be recessed, the sheet material is supported by the straight portion in the orthogonal direction and the traveling direction straight portion and the wire engaging portion are retracted from the sheet material, so that the bubbles in the sheet material are formed in the traveling direction. In addition to being easy to guide in a direction orthogonal to, it is possible to reliably prevent meandering.

Further, since the pressing roller has a columnar sheet contact portion formed in the center thereof and both ends thereof are formed to have a diameter smaller than that of the sheet contact portion, the both end portions of the sheet have a central portion. By reducing the diameter of the contact portion and sequentially using a sheet contact portion having a longer length, it is possible to smoothly push bubbles from the central portion of the sheet material to both end portions.

[Brief description of drawings]

1 to 7 show an embodiment of the present invention.
FIG. 1 is a schematic configuration diagram showing an example of a sheet material forming apparatus, FIG. 2 is a front view showing an example of a joining portion (defoaming portion) of two sheet bodies, and FIG. 3 is a defoaming wire mesh belt. FIG. 4 is a plan view showing an example of FIG. 4, FIG. 4 is a view taken along the line IV-IV in FIG. 3, and FIG.
FIG. 7 is an explanatory view showing an example of the support roller 23, FIG. 6 is a plan view showing an example of the pressing roller 24, and FIG. 7 is a VII- of FIG.
8 and 9 show a conventional winding roll, FIG. 8 is a plan view, and FIG. 9 is a front view. A: Resin, B: Glass fiber (reinforcing fiber), 11 ...
Lower polyethylene film (sheet body), 14 ... Defoaming wire mesh belt, 14a ... Wire, 14b ... Straight part in orthogonal direction, 14c ... Wire engaging part, 14d ... Straight part in traveling direction, 14e ... … Mesh body, 18 …… Upper side polyethylene film (sheet body), 23 …… Support roller, 23a…
… Annular groove, 24 …… Pressing roller, 24a …… Sheet contact part (pressing part), 24b …… Both ends, 34 …… Sheet material,

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ryoji Yamaguchi 2-17-15 Tsukushima Machinery, Chuo-ku, Tokyo Within Tsukishima Machinery Co., Ltd. Machinery Co., Ltd.

Claims (3)

[Claims] 1. When molding a sheet material in which a resin having reinforcing fibers is filled between two continuous sheet bodies, air bubbles between the two sheet bodies are pressed against each other. In the defoaming device in the sheet material molding device to be removed, the endless defoaming wire mesh belt in contact with one of the sheet bodies accommodates its wire engaging portion and traveling direction linear portion in the annular groove portions of the plurality of supporting rollers. A defoaming device in a sheet material molding apparatus, wherein a plurality of pressing rollers supported by the supporting roller in a state and contacting and pressing the other sheet body are arranged so as to sequentially increase the pressing portion. . 2. A mesh body comprising straight line portions in the advancing direction, straight line portions in the orthogonal direction, and wire engaging portions is formed by engaging a plurality of wires with each other, and the pitch of the wire engaging portions is a sheet. It is set to be longer in the direction orthogonal to the advancing direction of the material than in the advancing direction, and the wire engaging portion and the advancing direction linear portion are formed to be recessed from the plane formed by the orthogonal direction linear portion. A wire mesh belt for a defoaming device in a sheet material forming device, which is characterized in that 3. A pressing roller for a defoaming device in a sheet material molding apparatus, wherein a cylindrical sheet contact portion is formed in a central portion, and both end portions are formed to have a reduced diameter than the sheet contact portion. .