JPH0664831A - Cutting method for filmed smc - Google Patents

Abstract

(57) [Summary] [Purpose] Both films are surely peeled from the SMC with the films attached to both sides, and SM is attached to the cutter immediately after this peeling point.
Provided is a method for cutting an SMC with a film, which makes it possible to reliably send C. [Structure] A film-attached SMC in which films are attached to both sides of the SMC is passed through a pinch roll having irregularities on the outer periphery,
On the downstream side of this pinch roll, SMC with film
Each film on both sides of the SMC is in contact with the film contact curved surface of each scraper, which is disposed on each side of the both sides and whose curvature radius of the film contact curved surface is smaller than that of the pinch roll. Each film is peeled off by applying a tensile force to the film, and after peeling off both films, the SMC is cut to a fixed length.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cutting an SMC with a film.

[0002]

2. Description of the Related Art SMC (sheet molding compound) used for manufacturing FRP products such as bathtubs is
A sheet-like composition of a composition comprising unsaturated polyester resin, chopped strands, filler, etc., which has lost fluidity due to metal cross-linking by the addition of a thickener (oxides and hydroxides of alkaline earth metals) Yes, it is sticky.

In this SMC, a release-treated film is usually laid on an endless belt, and while the endless belt is running, a liquid unsaturated polyester resin is applied on the release-treated film while adding a thickener. A chopped strand is sprinkled and mixed therewith, and a release-treated film is coated thereon, and then wound into a roll, which is then stored and transported in a roll. Therefore,
When forming a product such as a bathtub, it is necessary to peel off the film and cut the SMC according to the product size.

Conventionally, in order to cut the above SMC with a roll-rolled film into a predetermined length, as shown in FIG. 3, the films 12 'and 12' on both sides of the SMC are rolled into pinch rolls.
Fold back with 3 ', 3', wind with a take-up bobbin,
Immediately after peeling both films, SMC11 'is cut
6'is cut to a fixed length, and this cut SMC is conveyed to a product forming stage (press stage) by a belt conveyor 7 '.

[0005]

However, in this method, when the adhesive strength between one side of the SMC and the film and the adhesive strength between the other side of the SMC and the film are weak, the film is peeled off on the side where the adhesive strength is weak. However, on the side having a high adhesive strength, the adhesive interface between the SMC and the film withstands the bending moment reaction force when the SMC is bent with the curvature of the pinch roll, and the adhesion between the film and the SMC. It is often the case that the SMC remains unwound and the SMC winds up with the film and cannot be fed towards the cutter. This is likely to occur particularly when there is a local thick portion, a film edge portion near the wrinkles or a fold due to the resin paste squeezed out during storage.

To further mention this phenomenon, FIG.
As shown in, the radius of curvature of the pinch roll 3'is R, SM
Assuming that the bending rigidity of C11 'is EI, the bending moment reaction force M generated when the SMC 11' is bent along the peeling roll 3'as shown by the dotted line is M = EI / R
And the SMC as the stress against this bending moment.
When the peeling force acting on the adhesive interface between the film and the film is f, when the adhesive force at the adhesive interface is larger than the peeling force f, the SMC is wound with the film without being peeled from the film. It goes.

However, the SMC and the film are bonded to each other with a considerably large adhesive force. Therefore, in order to increase the peeling force in order to eliminate the above phenomenon, the roll diameter of the pinch roll is used. It is necessary to reduce R to increase the bending moment reaction force M of the SMC, but there is a limit to the reduction of the roll diameter of the pinch roll, and there is a guarantee of reliable separation at the same interface. It is difficult.

An object of the present invention is to provide a method for cutting a SMC with a film, which makes it possible to surely peel both films from an SMC having a film attached on both sides and surely feed the SMC to a cutter immediately after the peeled portion. To provide.

[0009]

[Means for Solving the Problems] SM with a film of the present invention
The cutting method of C is to pass the SMC with film, which is a film attached to both sides of the SMC, through a pinch roll having irregularities on the outer periphery, and to dispose on each side of both sides of the SMC with film on the downstream side of this pinch roll. The film contact curved surface of the SMC has a radius of curvature smaller than that of the pinch roll, and a tensile force is applied to each film while the films on both sides of the SMC are in contact with the film contact curved surface of each scraper. After peeling the film and after peeling both films, S
The configuration is characterized in that the MC is cut to a fixed length.

[0010]

When the SMC with film passes through the pinch roll having irregularities on the outer circumference, slippage occurs between the film and SMC, and the adhesive force between them decreases.

Further, on the downstream side of the pinch roll, each film on both sides of the SMC was brought into contact with the film contact curved face of each scraper whose radius of curvature of the film contact curved face was smaller than that of the pinch roll. Since each film is peeled off in the state, the bending moment reaction force of the SMC necessary for the SMC to be wound up through the scraper together with the film while the SMC is adhered to the film on one side becomes large,
It becomes impossible to support such a large bending moment reaction force at the adhesive interface between the one-sided film and the SMC having the above-mentioned reduced adhesive force, and the film is smoothly peeled from the SMC. Further, since the SMC with the film is fed by the pinch roll, the tensile force applied to the film for peeling can be reduced, and the film is smoothly peeled without being cut.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a cutting device used in the present invention.

In FIG. 1, 10 is a SMC1 with film.
SMC11 (sheet form of composition of SMC11 (unsaturated polyester resin whose fluidity has been lost by addition of a thickener, a reinforcing material such as glass chopped strands and a filler) The peeling-treated films 12, 12 are attached to both sides of the body, which is wound in a roll shape, and is rotatably supported by the pedestal 2. Reference numerals 3 and 3 are a pair of pinch rolls having irregularities on the surface thereof. For example, as shown in FIG. 2A and FIG. As shown in FIG. 2C, a large number of irregularly shaped discs 30 fixed to the outer periphery of the core 32 having the insertion holes are formed on the shaft 33. ) Ones that are inserted with their positions shifted from each other can be used, and the uneven shape of the irregular shaped plates and the amount of deviation between the irregular shaped discs are set so as to maximize the peeling effect described below.

In FIG. 1, 4 and 4 are pinch rolls 3,
3 is a film scraper provided on the downstream side of 3 and has a radius of curvature of an arc surface that contacts the film.
It is sufficiently smaller than the radius of curvature of. Reference numerals 5 and 5 are winding bobbins for the peeled film. 6 is a cutter installed on the downstream side of the scraper. 7 is a conveyor belt.

To cut the SMC according to the present invention, the SMC1 with film is rolled by driving the pinch rolls 3 and 3.
The film 12, 12 pulled out from the reel winding body 10 and folded back and peeled by the scrapers 4, 4 is wound by driving the film winding bobbins 5, 5 to peel the film S
The MC 11 is cut to a fixed length with a cutter 6.

In this case, the pinch roll 4 comes into contact with the surface of the film-equipped SMC at the convex portion, the rotational force of the pinch roll 4 is transmitted to the film-equipped SMC 1 through this contact point, and the film-equipped SMC is pulled. Iki, at this time,
The SMC is pressed tightly at the contact point of the convex portion and is not compressed at the concave portion. As a result, the SMC flows directly under the film,
Since a slip occurs between the film and the film, the adhesive force between them is reduced, resulting in a semi-peeled state.

Further, in FIG. 1, it is assumed that the cut end portion e of the SMC 11 passes through the scraper 4 while being adhered to one of the films 12 and is wound by the winding bobbin 5 together with the film. Then, the bending moment reaction force generated in the SMC 11 when passing through the scraper 4 is M = EI, where EI is the bending rigidity of the SMC and R is the radius of curvature of the film contact surface of the scraper. / R. However, since R is extremely small, M is extremely large, and it is impossible to support such a large bending moment at the adhesive interface between the SMC and the film in the semi-peeled state where the adhesive strength is reduced. Therefore, it is impossible for the SMC to pass through the scraper and head toward the winding bobbin while being adhered to the film. Therefore, it is possible to ensure that the SMC is sent to the cutter with the films on both sides peeled off.

Furthermore, since the SMC with film 1 is fed toward the scrapers 4 and 4 by the pinch rolls 3 and 3, the winding tension of the film can be made sufficiently low and the film can be smoothed without being cut. You can take up with a take-up bobbin.

[0019]

EFFECT OF THE INVENTION The method for cutting SMC with a film of the present invention has the constitution as described above, and both films are temporarily peeled off from the SMC having the films attached to both sides, and then each film is formed into a contact surface having a large curvature. Since they are peeled off with a scraper, both films can be reliably peeled off smoothly without cutting the film, and the SMC from which these films have been peeled off is reliably sent to the cutter on the downstream side of the peeling point. be able to. Therefore, the SMC can be smoothly cut at the time of press-molding a product such as a bathtub with the SMC.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a cutting device used in the present invention.

FIG. 2 (a) is a pinchiro used in the present invention.
2 is a side view showing the profile plate for a roll, FIG. 2B is a front view of the same, and FIG. 2C is a front view showing a pinch roll assembled from the profile plate.

FIG. 3 is an explanatory diagram showing a conventional example.

[Explanation of symbols]

 1 SMC with film 11 SMC 12 film 3 pinch roll 4 scraper 6 cutter

Claims (1)

[Claims] 1. An SMC with a film in which a film is attached to both sides of an SMC is passed through a pinch roll having irregularities on the outer periphery, and the SMC with a film is provided on the downstream side of the pinch roll.
In a state in which each film on both sides of the SMC is in contact with the film contact curved surface of each scraper, which is arranged on each surface of both sides of the MC and whose curvature radius of the film contact curved surface is smaller than that of the pinch roll. After pulling each film by applying tensile force to each film, after peeling both films, SMC
A method for cutting an SMC with a film, which is characterized by performing a constant length cutting.