JPH0351205B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is applicable to the case where reinforcing materials such as paper, cloth, glass fiber, etc. are impregnated with liquid thermosetting resin and compression molded. The present invention relates to a continuous pressing method that can be used when two or more films or the like are laminated and compression molded.

(Prior art) Conventionally, when reinforcing materials such as paper, cloth, glass fiber, etc. are impregnated with liquid thermosetting resin and compression molded at room temperature or under heating, thermoplastic resin films are overlapped and then heated. When making boards by compressing, or when making plywood by compressing wood under heat using thermosetting resin as an adhesive, the material to be compressed is placed between the upper and lower templates using a batchwise single-stage or multi-stage press. , pressurized at room temperature or under heat. But in this case,
Continuation of the process has been desired from the viewpoints of labor saving, productivity improvement, and uniformity of quality.

As for the above-mentioned continuity, instead of the template, at least two drums are used to make two drums that are placed in tension and face each other vertically.
Examples include a method of using a set of endless steel belts and applying pressure to the object to be compressed through the steel belts at room temperature or under heating.

In addition, as a method of applying this pressure, multiple linear pressures are applied by sandwiching the rollers between a pair of upper and lower rollers arranged in series, and during the linear pressure, the drag force of the steel belt is generated by applying tension to the steel belt. A method of applying a certain amount of pressure, or an extension of this method, is to press a group of small diameter rollers against the steel belt with a smooth plate, and the rollers move at a speed of about half the running speed of the steel belt. There is a way to transmit pressure to the steel belt.

However, with these methods, not only is there a difference in pressure between areas where linear pressure is applied and areas where it is not, but also because of the limitations on the linear pressure that can be applied to the steel belt, it is only possible to increase the average pressure to a few kg/ ^cm2 . I couldn't do it. Therefore, if a high pressure of approximately 10 kg/cm ² or more is required to generate volatile substances during heating and curing, fluid pressure must be applied to the back surface of the steel belt.

However, in this case, a mechanism was required to prevent leakage of pressurized fluid between the pressurizing chamber and the running steel belt. For example, a gap filling device attached to the pressurizing chamber as shown in Japanese Patent Application Laid-Open No. 13075/1983 was required. In the conventional method shown in this publication, a gap filling device fixedly attached to the pressure chamber, that is, a flexible sealing material is pressed against the steel belt, or a solid material having lubricating properties is elastically pressed against the steel belt, and the pressure is This is a method to stop fluid leakage inside the room.

On the other hand, if the surface of the product to be compression-molded must be smooth, when the plate is made in batches using a multi-stage heated press, the product to be compressed is sandwiched between templates made of surface-polished stainless steel, aluminum, etc., and then pressure-formed. However, a method is used in which the surface of the template is transferred. Furthermore, even in the case of continuous production, it is necessary to transfer the surface of the steel belt, and therefore the surface of the steel belt that comes into contact with the object to be compressed needs to be mirror-polished.

When pressurizing continuously as described above, in order to prevent leakage of the pressurized fluid, a fixedly attached gap filling device is pressed against the back side of the polished surface of the continuously moving steel belt. In addition, in the case of a thin plate such as a steel belt, if the back side of the polished surface is strongly rubbed, the polished surface will be affected. Especially when applying uneven force,
Noticeable streaks appear on the polished surface. Phenomena that cause fluctuations in the pressing force when the gap filling device is pressed, such as differences in the thickness of the steel belt in the width direction, uneven thickness of the material to be compressed, and waving in the width direction when tension is applied to the steel belt. If a steel belt is operated continuously for a long time under such conditions, deterioration of the polished surface of the steel belt cannot be avoided.

In addition, rubber, plastic, etc. are used for the contact part of the gap filling device with the steel belt to prevent fluid leakage, but these materials deteriorate over time due to the pressure and temperature applied to the fluid, swelling due to the fluid, etc. If a part of the steel belt is missing and gets caught between the gap filler and the steel belt, it will cause strong linear scratches on the back side of the steel belt, and this will also be reflected on the polished surface, resulting in strong linear distortion. In some cases, it may become unusable as a polished surface. As described above, it has not been possible to produce a product with a good surface by the method of strongly abrading the back surface of the steel belt used in the conventional gap filling device.

In order to avoid the adverse effects of such scratches on products, for example, Japanese Patent Publication No. 59-33312 and Japanese Patent Publication No. 58-12148
As disclosed in the above-mentioned No. 1, a fluid supporting part or a sealing part is formed at the outer edge of the pressurizing chamber, and the pressurized fluid in the pressurizing chamber is effectively used on the surface of the belt or sheet-like object. Proposals have been made to prevent the surface of a belt or sheet-like object from being scratched by the outer edge portion.

However, according to these conventional techniques, there is no guarantee that the pressurized fluid in the pressurized chamber can be completely prevented from leaking outside the room, and in particular, with the latter technique, the pressurized fluid in the pressurized chamber is leaked to the outside of the pressurized chamber. It allows fluid to flow from inside the room through the space between the parts, and is not intended to have a so-called sealing function. Therefore, because the seal is incomplete or does not have a sealing function, the desired high pressure is not generated within the pressurizing chamber, making it difficult to achieve the intended purpose.

(Problems to be solved by the invention) In the conventional continuous pressurization method, there are problems such as deterioration of the polished surface of the steel belt due to continuous operation, making it impossible to obtain a product with a good surface. Ta. The present invention maintains a good polished surface while
Continuous pressurization method that can continuously apply a desired high pressure to the compressed material via an endless steel belt, etc., or a sheet or film-shaped compressed material that is continuously supplied without being sandwiched between steel belts. It is an object of the present invention to provide a continuous pressurizing method that can continuously pressurize an object to be compressed without damaging its surface.

(Means for Solving the Problems) For this reason, the present invention uses a belt or sheet-like material tensioned on at least two drums, and provides an object to be compressed with a belt or sheet-like material provided on the outside of the belt or sheet-like material. In a continuous pressurization method in which pressure is applied through the belt or sheet-like material by fluid pressure in a fixed pressurization chamber, a seal portion is provided at the outer edge of the fixed pressurization chamber, and the seal portion has a viscosity that increases as the temperature decreases. A sealing liquid that increases the pressure is supplied at a pressure higher than that of the fluid in the pressurizing chamber and a viscosity higher than that of the fluid in the pressurizing chamber, and the sealing liquid is supplied between the outer edge and the belt or sheet-like object. By filling them, they are kept in a non-contact state, and this is a means to solve the problem.

(Function) A sealing portion having a plane parallel to the belt or sheet-like object surface is provided at the outer edge of the fixed pressurizing chamber, and the sealing portion inside the pressurizing chamber is provided between the two planes formed by the sealing portion and the belt or sheet-like object surface. Provide a sealing liquid with sufficient pressure above the fluid pressure. The pressure of this sealing liquid causes a gap to be formed between the plane of the sealing portion and the plane of the belt or sheet-like object, and is filled with the sealing liquid. At this time, the sealing fluid temperature is lower than the pressurizing fluid temperature, and the sealing liquid viscosity is higher than the pressurizing fluid viscosity. This reliably prevents the pressurizing fluid from leaking out of the pressurizing chamber. On the other hand, a pressurizing fluid with a lower viscosity and lower pressure than the sealing liquid is supplied into the fixed pressurizing chamber using a supply system different from that of the sealing liquid, and is applied to the object to be compressed through the belt or sheet-like material. Apply pressure. By filling this sheeting liquid between the flat surface of the sealing part and the flat surface of the belt or sheet-like object, the two flat surfaces can be maintained in a non-contact state with a small gap, Therefore, it becomes possible to continuously press-form the object to be compressed without damaging the surface of the belt or sheet-like object.

(Example) The present invention will be explained below with reference to the embodiments shown in the drawings. Figures 1 and 2 show an apparatus for carrying out the method of the present invention, and Figure 1 shows the entire continuous pressurizing apparatus using an endless steel belt. FIG. 2 is a detailed view of the press section in FIG. 1. In the figure, reference numerals 1 and 1' denote two sets of upper and lower drums installed at the front and back, respectively, on which tensioned endless steel belts 2 and 2 are hung. .

Reference numeral 5 denotes a sealing portion, in which a sealing liquid 7 is injected at a higher pressure and lower temperature than the pressurizing fluids 6, 6, and this pressure forms a gap between the peripheral portions 8a, 8a of the housing 8 and the steel belts 2, 2. , the sealing liquid 7 is filled to prevent the pressurized fluid 6 from flowing out to the outside, and the peripheral portion 8a and the steel belt 2 are prevented from coming into contact with each other. In this case, the drums 1 and 1' may be heating drums, or a preheating device may be inserted between the drum 1 and the fixed pressurizing chamber 4 to preheat the steel belt 2 and the material to be compressed 3. In addition, heating or cooling devices may be installed inside and outside the fixed pressurizing chamber 4 to heat or cool the fixed pressurizing chamber 4.
It is also possible to divide the chamber into a plurality of chambers and perform pressurization under arbitrary temperature conditions.

Further, the upper and lower fixed pressure chambers 4, 4 can be spaced apart from each other by hydraulic cylinders, connecting shafts, or the like, and can be defined by hydraulic pressure or fixed mechanical force. In this state, the highly viscous sealing liquid 7 is injected into the sealing portion 5 while applying a higher pressure than the pressurizing fluid, and the pressurizing fluid 6 is also injected into the fixed pressurizing chamber 4 while applying pressure.

The steel belt 2 receives a uniform surface pressure due to the pressure of the pressurizing fluid 6, and this force pressurizes the compressed object 3 with a uniform surface pressure. The object 3 to be compressed is heated or cooled by the difference in temperature between the pressurizing fluid 6 and the steel belt 2. Furthermore, by supplying the sealing liquid 7 to the sealing part 5 at a pressure higher than the pressure in the fixed pressurizing chamber 4 of the pressurizing fluid 6, a stable flat sealing liquid 7 is formed in the gap of the sealing part 5. You can create layers of This fluid 7
This layer holds the peripheral edge 8a and the steel belt 2 so that they do not come into contact with each other.

Therefore, the surface of the steel belt 2 is not rubbed at all by the peripheral edge 8a, and the steel belt 2 is driven under pressure without resistance. Further, the sealing liquid 7 supplied to the sealing part 5 is
It flows out of the fixed pressurizing chamber 4 through the gap formed by the steel belt 2 and the steel belt 2. This outflow velocity is
The pressure within the fixed pressurizing chamber 4, the size of the gap between the seal portion 5, the surface condition of the peripheral portion 8a and the steel belt 2,
It is determined by the viscosity of the sealing liquid 7, etc.

In addition, in order to reduce the friction between the outer edge portion 8a and the steel belt 2 to the level of fluid friction and reduce the driving force of the steel belt 2, the gap between the seal portions 5 must be kept at a size of approximately 0.1 μm or more. There is a need. Therefore, in order to suppress the flow rate of the sealing liquid 7, the viscosity of the sealing liquid 7 is increased. for example,
The supply temperature of the sealing liquid 7 may be set lower than the temperature of the pressurizing fluid 6. The pressurizing fluid 6 is
Although it may be circulated as shown in the drawing, it may also be used in a closed state without circulation.

(Effects of the Invention) As described above in detail, the present invention provides a sealing portion at the outer edge of a fixed pressurizing chamber, and supplies a sealing liquid at a higher pressure and lower temperature than the pressurizing fluid to connect the outer edge to a belt or sheet. By filling the sealing liquid between the shaped objects, the leakage of the pressurized fluid inside the pressurizing chamber to the outside is completely prevented, and at the same time, the outer edge and the belt or sheet-like object are kept in a non-contact state. Therefore, even if a polished steel belt is used, no abrasion force is applied to the pressure chamber surface, and while maintaining a good polished surface for a long time, the steel belt can continuously apply pressure to the compressed object. high pressure can be applied to. Note that the same effect can be achieved by using not only a steel belt but also a sheet-like material made of a wide variety of materials such as plastic as the belt-like material that sandwiches the object to be compressed.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of a continuous pressurizing device for carrying out a method according to an embodiment of the present invention, and FIG. 2 is a detailed sectional view of the main parts thereof. Explanation of the main parts of the diagram, 1, 1'...drum, 2...
...Endless steel belt, 3...Object to be compressed,
4... Fixed pressurization chamber, 5... Seal portion, 6... Pressurizing fluid, 7... Seal liquid, 8... Housing, 8a... Peripheral portion.

Claims (1)

[Claims] 1. Using a belt or sheet-like material tensioned on at least two drums, the object to be compressed is compressed by fluid pressure from a fixed pressurizing chamber provided outside the belt or sheet-like material. In the continuous pressurization method in which pressure is applied via the belt or sheet-like material, a sealing portion is provided at the outer edge of the fixed pressurizing chamber, and a sealing liquid whose viscosity increases as the temperature becomes lower is applied to the sealing portion. By supplying the fluid at a higher pressure than the fluid in the pressure chamber and with a viscosity higher than the viscosity of the fluid in the pressurizing chamber, and filling the sealing liquid between the outer edge and the belt or sheet-like material, a state in which there is no contact with each other is achieved. A continuous pressurization method that maintains 2. The continuous pressurization method according to claim 1, characterized in that the fixed pressurization chamber is divided into a plurality of chambers, and the temperature and pressure of each pressurization chamber is arbitrarily changed. 3. The continuous pressurization method according to claim 1, characterized in that a sealing liquid is supplied to a sealing portion on at least one side of the outer edge of the fixed pressurization chamber. 4. The continuous pressurization method according to claim 1, comprising at least one fixed pressurization chamber. 5. Claim No. 5, characterized in that the material to be compressed is fed to the press part by sandwiching it between two sets of steel belts, or it is fed as a sheet-like object made of a material such as plastic, and is continuously pressurized. 1
The continuous pressurization method according to item 1, 2, 3, or 4.