JPH0656340A - Cutting method of sheet molding compound with film - Google Patents

Abstract

PURPOSE:To actualize the accurate separation of a film by using a specific scraper for this film separation at a time when this film is separated from a filmed sheet molding compound fitted with each film on both sides of the sheet molding compound(SMC) and cutting this SMC in a regular size. CONSTITUTION:In a filmed SMC 1 fitted with each film on both sides of a SMC 11 being used in the manufacture of a fiber reinforced plastic product such a bathtub or the like, at the time of using this SMC 11, a filmed SMC 1 is rewound from a roll winding body 10 by rotation of a pinch roll 3. At this time downstream of the pinch roll 3, the films 12 on both sides of the SMC 11 are separated by a scraper 4 in a state of being turned up, and these separated films are wound by a winding bobbin 5. The scraper 4 has a tip end face with curvature being larger as compared with that of the pinch roll 3, and it is made up of having a lubrication discharging nozzle 42 built-in, through which separation of the film 12 is smoothly carried out. The SMC 1 is cut off into regular size by a cutter 6 afterward.

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. At the same time, the chopped strands and the like are sprinkled and mixed, and a release-treated film is coated on the sprinkled strands, which is then wound into a roll, which is stored and transported in a roll. Therefore, in forming a product such as a bathtub, it is necessary to peel the film and cut the SMC according to the product size.

Conventionally, in order to cut the above SMC with a roll winding film into a predetermined length, the films on both sides of the SMC are peeled off by a peeling roll, and immediately after the peeling, the SMC is cut to a fixed length with a cutter. Then, the cut SMC is conveyed to a product forming stage (press stage) by a belt conveyor.

[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 with 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 peeling roll, and the film and the SMC Often, the bond remains retained and the SMC winds up with the film, and the SMC cannot be fed toward 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 peeling roll 4'is R, SMC
If the bending rigidity of 11 'is EI, the bending moment reaction force M generated when the SMC 11' is bent along the peeling roll 4'is M = EI / R. -If the peeling force acting on the adhesive interface between the SMC and the film as the stress on the ment is f, the SMC is wound together with the film when the adhesive force at the adhesive interface is larger than the peeling force.

Therefore, the peeling force acting on the adhesive interface between the SMC and the film, which is the stress against the bending moment of the SMC, becomes larger as the moment becomes larger, and the local portion of the interface becomes local. If the bending moment when a peeling force equal to the maximum adhesive force is generated is M _0, and if the radius of curvature of the peeling roll is smaller than EI / M ₀ , the SMC is
Although the interface between the film and the film can be reliably peeled off, there is a limit to the reduction of the roll diameter, and as long as the peeling roll method is used, it is difficult to guarantee the reliable peeling of the interface.

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 a film-attached SMC in which a film is attached to both sides of the SMC through a pinch roll, and on the downstream side of this pinch roll, the SMC with a film is arranged on each side of the SMC with the tip end face. Each screen with a large curvature surface
Applying a tensile force to each film in the state that each film on both sides of SMC is in contact with the curved surface of the tip of the paper,
While peeling each film while wetting the contact interface between the film and each film with a lubricant, after removing both films, SMC
It is characterized in that it is cut to a fixed length.

[0010]

Since the radius of curvature of the curved surface of the scraper tip is made extremely small, it is possible that the SMC is wound with the film through the scraper while the SMC is still adhered to the film on one side. It is reliably eliminated due to the large bending moment reaction of the SMC for its small radius of curvature of the curved surface.

Also, SM with film by pinch roll
Since the C is fed, the tensile force applied to the film for peeling can be reduced, and the frictional force at the contact interface between the scraper and the film can be reduced due to the lubricant.
The film is smoothly peeled off 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-like composition of SMC11 (unsaturated polyester resin whose fluidity is lost by addition of a thickening agent, a reinforcing material such as glass chopped strands, and a filler) A body having a release-treated film 12 attached to both sides thereof is wound in a roll shape, and is rotatably supported by a pedestal 2. 3 and 3 are a pair of pinch rolls.
Film scrapers 4 and 4 have a predetermined inclination angle so that the films 12, 12 on both sides of the SMC 1 with film are peeled off in a folded state on the downstream side of the pinch roll, and in the length direction of the SMC. It is provided in a shifted position. As shown in FIG. 2B, the scraper 4 has a plate shape having a width slightly wider than the SMC width.
(B), the curvature of the tip curved surface 41 is remarkably larger than the curvature of the pinch roll 3, the lubricant discharging nozzle 42 is built in, and the discharge slit is opened in the tip curved surface 41. You can use what has been done.
43 is a hose for supplying a lubricant, and 44 is a stepped portion provided at both ends of the scraper.

In FIG. 1, 5 and 5 are take-up bobbins for the peeled film, 6 is a cutter installed on the downstream side of the scraper, and 7 is a conveyor belt. SM according to the invention
In order to cut C, the SMC 1 with film is pulled out from the roll winding body 10 by driving the pinch rolls 3 and 3, and the film 12 peeled back by each scraper 4 is removed from each scraper tip curved surface with a lubricant. The film 1 is wound up by driving the film winding bobbin 5 while causing the film 1
The SMC 11 from which 2 and 12 have been peeled off is cut to a fixed length with a cutter 6.

FIG. 1 shows a state immediately after cutting the SMC 11. In FIG. 1, it is assumed that the cut end e of the SMC passes through the tip curved surface of the scraper 4 while being adhered to one of the films 12 and is wound by the winding bobbin 5 together with the film 12. , The bending moment reaction force generated in the SMC 11 when passing through the tip curved surface of the scraper 4 causes the bending rigidity of the SMC to be EI,
If the radius of curvature of the curved surface of the tip of the paper is R, then M = EI / R. However, since R is extremely small, M is extremely large, and such a large bending moment is
It is impossible to support by the adhesive force of the adhesive interface between the SMC and the film, and the SMC cannot pass through the tip curved surface of 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.

Further, the SMC 1 with a film is fed toward the scrapers 4 and 4 by the pinch rolls 3 and 3, and the contact interface between the film 12 and the scraper tip curved surface is wetted with a lubricant to form a contact interface. Since the frictional force is reduced, the winding tension of the film can be made sufficiently low, and the film can be smoothly wound without cutting.

As shown in FIG. 2A, since both ends of the scraper 4 are stepped, the tension acting on the film when winding the release film can be relaxed at both ends of the width. Even if there is a cut on the edge of the film, the incision over the entire width from the cut can be well avoided.

[0018]

The method of cutting SMC with film of the present invention is constructed as described above, and since the curvature of the scraper tip curved surface can be increased and the frictional force between the curved surface and the film can be sufficiently reduced, Both films can be reliably and smoothly peeled from the SMC with the films attached to both sides without cutting the film, and the SMC from which both films have been peeled can be reliably sent to the cutter on the downstream side of the peeling location. Therefore, it is possible to smoothly perform the standard length cutting of the SMC when 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.

2 (A) is a perspective view showing a scraper used in the present invention, and FIG. 2 (B) is a cross-sectional view taken along line II-II of FIG.

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 41 Scraper tip curved surface 42 Lubricant discharge nozzle 5 Winding bobbin 6 Cutter

Claims (1)

[Claims] 1. A film-attached SMC having films attached to both sides of the SMC is passed through a pinch roll,
On the downstream side of the film, each scraper is provided for each surface of both sides of the SMC with film, and the front end surface has a large curvature surface.
Applying a tensile force to each film in the state that each film on both sides of SMC is in contact with the curved surface of the tip of the paper,
While peeling each film while wetting the contact interface between the film and each film with a lubricant, after removing both films, SMC
A method for cutting an SMC with a film, which is characterized by performing a constant length cutting.