JP2001018242A - Heat-resistant cushioning material for molding press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily bond a metal plate or the like to a cushioning material by bonding an adhesive film having such a property that adhesive properties are revealed under heating in a semi-cured state to one of the faces of a heat- resistant cushioning material for a molding press and at the same time, attaching a fabric with a proper mesh, superposed on the film. SOLUTION: The cushioning material 1 to be used during manufacturing a decorative plywood for building or the like by heat press-molding, is interposed between the surface of a plain sheet and a hotplate, when the plain sheet as a material to be molded is press-molded by the upper and the lower hotplate. The cushioning material 1 which is applicable as described is molded by disposing an adhesive sheet 2 on one of the faces of a felt cushioning material 1, then superposing a fabric 4a with a rough mesh on the adhesive sheet 2 and attaching a metal plate 3 on the top. Thus it is possible to easily adjust an adhesive force between the fabric 4a and the metal plate 3 by changing the density (mesh) of the fabric 4a. Further, the metal plate 3 and the cushioning material 1 are separable from each other, when the life of the material 1 is over and the metal plate 3 can be repeatedly used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cushion used for manufacturing a paper phenol laminate or a glass epoxy laminate for a printed circuit board, or a decorative plywood for construction such as melamine resin or phenol resin by hot press molding. Material, and more specifically, when a laminated flat sheet (resin prepreg), which is a material to be molded containing a synthetic resin as a main component, is pressure-formed with upper and lower hot plates, The present invention relates to a heat-resistant cushioning material for a forming press used between a surface and a hot plate.

[0002]

2. Description of the Related Art In general, heat-resistant cushioning materials for forming presses used for manufacturing paper phenol laminates and glass epoxy laminates for printed circuit boards are formed by unevenness, deformation, and uneven thickness of a hot plate or a mirror plate. And the like, and has an important function of transmitting uniform pressure and heat to the entire surface of the molded prepreg (B-stage state). After returning to the liquid state, the hardening gradually progresses, so that, during pressing, the metal mirror face plate is in contact with the prepreg sheet surface to evenly transmit the heat and pressure from the hot plate to the entire surface of the laminated prepreg sheet. Is arranged, and a cushioning material is interposed between the hot platen and the mirror surface plate.If molding without using the cushioning material, the laminated prepreg sheet which is a material to be molded is While heat is transmitted quickly to the board side, heat transfer is slow at the center of the laminated prepreg sheet, resulting in a large difference in moldability, making molding impossible, and There is a problem that uneven pressure is generated due to the distortion and unevenness is generated in the molded product.

Conventionally, a plurality of cushion papers such as kraft paper have been used as the cushioning material in accordance with the molding conditions. However, the pulp is damaged by heat and pressure during use, and the pulp is damaged and becomes brittle. Those with severe conditions could be used only once. For this reason, it is necessary to change the kraft paper every time, and it is necessary to count and prepare the required number of sheets that match the press conditions.Furthermore, since setting to the press machine can not be done with the machine, it will not be possible to save labor. There was a problem. In addition, a large amount of kraft paper must be kept in stock, and air conditioning must be performed so that it is not affected by the outside air (humidity) while it is in stock. In some cases, paper dust was scattered from the cut surface of the paper and adversely affected the product.

[0004] For this reason, a cushion material mainly composed of rubber or a web material mainly composed of heat-resistant fiber is laminated instead of kraft paper, and the cushion material is entangled and integrated by needle punching. Can be used.

[0005]

The cushioning material obtained by laminating webs made of the above-mentioned heat-resistant fiber as a main raw material and entangled and integrated by needle punching has excellent heat resistance that can withstand repeated use under high temperature and high pressure. Using a meta-aromatic polyamide fiber, the felt had a resilient felt shape.

This meta-aromatic polyamide fiber has a sufficiently good heat resistance at a press-molding temperature of a printed board usually performed in a temperature range of 20 ° C. to 220 ° C. In particular, a web of these fibers
The felt-like body, which is laminated to about 00 to 5000 g / m ^{2 and} entangled and integrated by needle punching to impart systematic stability, can withstand relatively well the repetition of the hot press at the high temperature, and has harmful deformation. It has the advantage that it does not suddenly cause so-called sag.

Therefore, the imbalance of the transmission pressure between the contact surfaces due to the unevenness of the heating plate or the mirror plate or the intervention of foreign matter is absorbed, and the uniform pressure within the precision allowed for the printed circuit board is relatively long. It is still used as a main cushion material at present, because it has the effect of being able to transmit for a period.

However, the elastic felt-like cushion material obtained by laminating webs made of the heat-resistant fiber as a main raw material and entangled and integrated by needle punching is the elastic felt-like cushion material. Therefore, the laminate has a high air permeability, and even if the manufacturer of the laminated board attempts to automatically convey the cushion material using the suction pad as a labor-saving measure, the cushion material alone cannot suction and cannot be conveyed.

Therefore, there is a case where a user attaches a metal plate such as an iron plate or a zinc steel plate to the cushion material so that the cushion material can be automatically conveyed by the suction pad. At this time, the user prepares an adhesive and applies an adhesive to the entire surface of the cushioning material and attaches a metal plate, or a band-like adhesive sheet is attached to the four sides of the cushioning material and a metal plate is attached. It took time and effort.

A cushion material obtained by laminating webs made of heat-resistant fibers as a main raw material and entangled and integrated by needle punching has a resilient felt shape that can withstand repeated use under high temperature and high pressure. On the contrary, this causes fluff on the surface of the cushion material and causes hair loss.

The present invention has been made to solve the above-mentioned problems, and as a countermeasure for labor saving, simplification of laminating a metal plate on a cushion material surface to enable automatic conveyance of a felt-like cushion material by a suction pad. Fluff from the surface of the felt-like cushioning material, providing a heat-resistant cushioning material for forming press that enables simplification of metal plate bonding to prevent hair loss, and among the heat-resistant cushioning material for forming press during disposal, The incinerated cushion material and the non-incinerated metal plate are separated and disposed, or the metal plate can be reused.

[0012]

According to the present invention, there is provided a heat-resistant cushioning material for a forming press according to the present invention, which is a heat-resistant cushioning material for a forming press other than cushion paper. Adhesive film that has adhesiveness under heating without adhesiveness is bonded in a semi-cured state, or on one or both surfaces of the heat-resistant cushioning material for forming press, there is no tackiness at room temperature and adhesiveness is exhibited under heating A semi-cured adhesive film is attached to the cushioning material, and a woven cloth with moderately open eyes is laminated and adhered on the film. Or you can put it down and glue it with just a press. Further, since the pressing can be performed under the molding conditions of the user, the pressing can be performed simultaneously with the first molding press. In addition, by adjusting the openness of the eyes of the woven fabric to be pasted on the adhesive sheet,
It was configured so that the adhesive strength with a metal plate or the like could be controlled.

Further, the invention according to claim 2 is characterized in that the heat-resistant cushioning material for forming press uses a heat-resistant fiber as a main raw material and a web made of these fibers from 500 to 500.
Approximately 50,000 g / m ² are laminated and entangled and integrated by needle punching to form a felt-like structure with stability, and the adhesive film forms a film to block ventilation, thus saving labor. In addition to enabling automatic conveyance by the corresponding suction pad, the system is configured to enable long-term stable use.

Further, according to the third aspect of the present invention, there is no tackiness at room temperature used for laminating a heat-resistant cushioning material for a molding press and a woven fabric having an appropriate opening, and the adhesiveness is exhibited under heating. By using a urethane resin as the film, sufficient adhesiveness can be secured at the molding temperature (160 to 250 ° C.), it can withstand long-term use, and the metal plate can be bonded by the user after the woven fabric is bonded. It was configured so that sufficient time margin could be secured.

Further, the invention according to claim 4 is configured such that the material of the woven fabric to be bonded to the heat-resistant cushioning material for forming press is a meta-based aromatic polyamide fiber, so that it can be used stably for a long period of time.

Further, according to the fifth aspect of the present invention, it is possible to adjust the adhesive strength to the metal plate by changing the density (opening) of the woven fabric to be bonded to the heat-resistant cushioning material for forming press. Thus, when the cushion material reaches the end of its life, the metal plate and the cushion material can be peeled off, and the metal plate can be used repeatedly. In addition, by increasing the density of the woven fabric, it is possible to prevent the felt cushion material from fluffing and hair loss without attaching a metal plate.

[0017]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a forming press in which an adhesive sheet 2 is placed on one side of a felt cushioning material 1 according to the present invention, and a metal plate 3 capable of suction movement is bonded to the felt surface side using a coarse woven cloth 4a. Heat resistant cushioning material.

FIG. 2 shows an adhesive sheet 2 placed on both sides of a felt cushioning material 1 according to the present invention, and a coarse woven cloth 4a is used on the side where a metal plate 3 that enables suction transfer is to be bonded. This is a heat-resistant cushioning material for forming presses, which has been subjected to double-sided processing using a fine woven cloth 4b on the side intended to prevent fluffing and hair loss.

Fibers, which are the main raw materials constituting the felt cushioning material 1, are formed under high-temperature and high-pressure forming press conditions (for example, glass epoxy laminate forming conditions, temperature: 180 to 2).
10 ° C., pressure: 30 to 50 kg / cm ² , forming conditions of paper phenol laminate, temperature: 160 to 190 ° C., pressure: 8
Any fiber having a heat resistance of 0 to 120 kg / cm ² ) which can be used stably for a long time may be used. For example, it can be appropriately selected from aliphatic polyamide fibers, polyethylene terephthalate fibers, polyphenylene sulfite fibers, polyetheretherketone fibers, and aromatic polyamide fibers.

The felt cushioning material 1 is made of a web made of the above-mentioned heat-resistant fiber as a main raw material in an amount of 500 to 5000.
g / m ² are laminated and entangled and integrated by needle punching, and are systematically stable. For this reason, it can withstand repeated hot pressing at high temperatures relatively well,
Since no harmful deformation or so-called sag is caused suddenly, it can be used stably for a long period of time.

The adhesive sheet 2 on which the woven fabric 4 is pasted on the felt cushioning material 1 is not particularly specified as long as it is a resin which does not have tackiness at room temperature, exhibits adhesiveness under heating, and further loses adhesiveness by curing. For example, urethane resin, phenol resin, epoxy resin, urea resin, melamine resin,
Any thermosetting resin such as unsaturated polyester resin and silicone resin may be used. If the adhesive sheet 2 is too thick, the felt space is closed by the resin and the cushioning property is impaired. Therefore, the adhesive sheet 2 may be thin to some extent but only need to exhibit sufficient adhesive strength.
0 to 300 g / m ² is sufficient.

Woven cloth 4 to be pasted on felt cushion material 1
The material is not particularly limited as long as it has heat resistance that can withstand the molding temperature. For example, it can be appropriately selected from aliphatic polyamide fibers, polyethylene terephthalate fibers, polyphenylene sulfite fibers, polyetheretherketone fibers, and aromatic polyamide fibers. Also, the density of the woven cloth 4 (including the empty space) is rough to some extent when the user attaches the metal plate 3, and the felt cushion material 1 and the metal plate 3 need not be peeled off during use. When the woven cloth 4 is applied only for the purpose of preventing fluff and hair loss, it is important to adjust the basis weight and the structure of the woven cloth 4 so that the resin does not seep out to the surface of the woven cloth 4 when the user presses. In addition, when the woven cloth 4 is applied only for the purpose of preventing the cushion material from fluffing and preventing hair loss, it is sufficient that the resin does not exude to the surface. The thickness of the adhesive sheet 2 can be adjusted.

The method of bonding the felt cushion material 1 and the woven fabric 4 through the adhesive sheet 2 is based on a thermocompression bonding method using a hot roll or a hot platen press. ° C, speed 0.5
５5m / min, pressure is felt density of 0.6-0.7g /
It was adjusted by using a gauge so that the cm ^3. In the case of bonding by a hot plate press, it is not practical because it is a batch process, but the conditions are a temperature of 100 to 250 ° C.
The pressure and press time are such that the felt density is 0.6 to 0.7 g /
Adjust to be cm ³ .

Example 1 A web made of meta-aromatic aramid fibers (manufactured by Teijin Limited, Conex) was laminated and woven together by needle punching. A felt cushion material (basis weight: 2500 g)
/ M ² , thickness: 8 mm) 200 g of thermosetting basis weight that has no tackiness at room temperature and exhibits adhesiveness under heating on one side
/ M ² urethane film, and a woven fabric made of meta-aromatic aramid fiber (manufactured by Teijin Limited, Conex fabric CO5121, warp: 30 count, 120 yarns / 5c)
m, sewing thread: 30th count, 120 threads / 5cm, basis weight: 96g
/ M ² ) and 0.5 m in a 200 ° C. hot roll press.
/ Minute to perform the bonding process. At this time, a thickness gauge was inserted to adjust the density of the felt cushion material after the surface woven fabric bonding process to about 0.64 g / cm ³ .

The felt cushion material is cut to the size used, delivered to a laminate manufacturer, and a metal plate having a thickness of 0.2 mm is placed on the surface of the cushion material. / Cm ² . As a result, the automatic conveyance by the suction pad becomes possible, and the man-hour for the metal plate bonding process by the user can be reduced.

Example 2 A woven cloth was adhered to the surface of the felt cushioning material of Example 1.
After working, turn it over and there is no tack at room temperature
100g / m of thermosetting basis weight that exhibits adhesiveness ²Ure
Place a tin film on it and place on it a meta-aromatic aramid fiber
Woven woven fabric (Conex woven CO1 made by Teijin Limited)
910, warp: 30 count, 2 strands, 120 threads / 5cm,
Weft: 30 count, 2 strands, 92 threads / 5cm, weight: 17
0 g / m ²) And put it on a hot roll press at 200 ° C.
Pass the woven fabric at both sides of the cushioning material at a speed of 5 m / min.
I finished it. At this time, put the thickness gauge
Felt after gluing woven fabric on both sides of cushioning material
The density of the cushioning material is 0.68 g / cm³About
Was adjusted.

Cut this felt cushion material to the size used.
Cut and delivered to the laminate manufacturer to provide a cushioning surface
0.2mm on the (woven cloth coarse CO5121 adhesion surface)
Place a thick metal plate under the glass epoxy laminate molding conditions.
190 ℃ ・ 30kg / cm ²Perform lamination processing
Was. As a result, automatic conveyance by the suction pad becomes possible.
The number of man-hours for metal plate bonding by the user can be reduced.
Was. In addition, a fine woven cloth is adhered to the back of the cushion material
Worried about fluffing and hair loss from the back by processing
Is gone.

The adhesive film for laminating a woven fabric described in Examples 1 and 2 above is a thermosetting resin film which has no tackiness at room temperature and exhibits adhesiveness under heating.
We are not particular about the material. In addition, the thickness and basis weight of the film depends on whether the resin needs to seep out on the surface of the woven or nonwoven fabric to be pasted,
It is determined as appropriate based on the balance with the woven or nonwoven fabric.

The material of the woven or non-woven fabric is not particularly limited as long as it has heat resistance. In addition, about thickness, density, basis weight,
Depending on whether it is necessary to seep out the resin on the surface of the woven or nonwoven fabric or not, it is appropriately determined based on the balance with the resin film.

Of course, it goes without saying that the bonding process can be simultaneously performed on both surfaces in order to improve productivity and the like.

[0031]

As described above, the present invention provides a semi-cured adhesive film having the property that it has no tackiness at room temperature but exhibits adhesiveness under heating on one or both surfaces of the heat-resistant cushioning material for forming press. Bonding in a state, or bonding one side or both sides of the surface of the heat-resistant cushioning material for the forming press, an adhesive film having no tackiness at room temperature but exhibiting adhesiveness under heating in a semi-cured state. Since a heat-resistant woven cloth with a moderately open base cloth is stuck on the adhesive film, the user places a metal plate or the like to be bonded on or under the cushioning material and presses it. The bonding process can be done just by doing. further,
Since the press working can be performed under the molding conditions of the user, there is an advantage that the press working can be performed simultaneously with the first press.

As a result, the product of the present invention simplifies the bonding of the metal plate to the surface of the cushion material to enable automatic transfer of the felt-like cushion material by the suction pad and the fluff from the surface of the felt cushion material as a labor saving measure. ,
It has effects such as prevention of hair loss.

The metal plate adhered to the surface of the cushioning material varies depending on the user, such as a zinc steel plate, a stainless steel plate, and a steel foil. The adhesive force can be controlled by changing the size of the woven fabric. For this reason, when the cushioning material reaches the end of its life and is discarded, there has been no other method than the conventional method in which the metal plate cannot be peeled off and cut and landfilled.However, the present invention product allows the metal plate to be easily peeled off and incinerated. It is now possible to separate and separate possible felt cushioning materials and non-incinerated metal plates, or to reuse metal plates.

[Brief description of the drawings]

FIG. 1 is a schematic structural cross-sectional view showing an embodiment of the present invention and before single-sided bonding.

FIG. 2 is a schematic structural sectional view showing another embodiment of the present invention and before double-sided bonding.

[Brief description of reference numerals]

 DESCRIPTION OF SYMBOLS 1 Felt cushion material 2 Adhesive sheet 3 Metal plate 4a Sunny woven cloth 4b Fine woven cloth

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) // B29K 105: 08 B29L 9:00 F term (Reference) 4F100 AK01B AK47 AK51 AR00A AT00B AT00D BA03 BA04 BA07 BA10A BA10C BA10D DC11C DG01A DG01C DG06A DG11C DG15A EC09A GB90 JA13C JB13B JJ03A JJ03C JK11A JL00 JL02 JL13B JL13D 4F204 AA00 AG03 FA15 FB01 4L047 AA24 BA03 BC12 CA04 CA06 CA19 CC14

Claims (5)

[Claims] 1. A heat-resistant cushioning material for a forming press, excluding cushion paper, in which a film which has no tackiness at room temperature and exhibits adhesiveness under heating is applied to one or both surfaces of the heat-resistant cushioning material for a forming press in a semi-cured state. Or, on one or both sides of the surface of the heat-resistant cushioning material for the forming press, the film is adhered in a semi-cured state, and a woven fabric with a moderately open eye is overlaid on the film and stuck. Characterized as a heat-resistant cushioning material for molding presses. 2. The heat-resistant cushioning material for a forming press is formed by laminating webs made of heat-resistant fibers as a main raw material,
The heat-resistant cushioning material for a forming press according to claim 1, wherein the cushioning material is an elastic felt-like cushion material entangled and integrated by needle punching. 3. The material of the film adhered to the surface of the heat-resistant cushioning material for forming press, which has no tackiness at room temperature and exhibits adhesiveness under heating is a thermosetting resin. Heat-resistant cushioning material for forming presses described in 1. 4. The material of a woven fabric to be bonded to the surface of a film having no tack at room temperature and exhibiting adhesiveness under heating at room temperature is made of a heat-resistant fiber.
Or a heat-resistant cushioning material for a forming press described in 3 above. 5. The density of a woven fabric to be bonded to a surface of a film which has no tackiness at room temperature and exhibits adhesiveness under heating at the normal temperature is the same or different on both sides.
The heat-resistant cushioning material for a forming press according to 2, 3, or 4.