TW201534479A - Adsorbing film and fabrication method thereof, and adsorbing film with release film adhering thereto and fabrication method thereof - Google Patents

Abstract

The assignment of the present invention is to provide an adsorbing film which is suitable for a buffer which will be installed in an adsorbing plate such as a mold and the likes when adsorbing a plate shaped adsorbed material which is easy to be deformed such as a ceramic green sheet. Coating a release film (1) with heated hot melt adhesive; welding the adhesive to a porous sheet (3) when the adhesive becomes low temperature; forming a laminated body in which the release film (1), an adhesive layer (2) which is composed of the hot melt adhesive, and the porous sheet (3) are laminated in order; and exfoliating the release film (1) from the laminated body and obtaining the adsorbing film which is formed by laminating the adhesive layer (2) and the porous sheet (3). The porous sheet is called ultrahigh molecular weight polyethylene resin porous sheet. The adsorbing film has 0.8 N/25 mm or more of stainless adhesion and 5 cm3/cm2 . second or more of permeability for the adhesive layer.

Description

Adsorption film and manufacturing method thereof, and adsorption film having release film and manufacturing method thereof

The invention relates to an adsorption film which is used for adsorbing a ceramic green sheet to a predetermined position by using an adsorption machine, and is suitable for being interposed between the adsorption plate of the adsorption machine and the ceramic green sheet when the adsorption ceramic green sheet is transported to a predetermined position. Buffer material. Further, the present invention relates to an adsorption film having a release film and a method of producing the same.

A chip capacitor for a mobile phone or the like is produced by laminating ceramic chips on which electrodes are printed. The adsorption machine for adsorbing ceramic green sheets and peeling them from the release paper, and transporting them to the same place, separating and laminating, is loaded with an adsorption plate for adsorbing the entire ceramic green sheets. In order to smoothly carry out the above-described series of steps, the surface smoothness, air permeability, and release property of the adsorption plate system are required to further require moderate cushioning properties. Most of the adsorption plates use a metal mold having an opening for ventilation. However, metal molds lack cushioning properties. In order to compensate for the cushioning property of the metal mold, a cushioning material can be loaded on the surface thereof. The cushioning material is preferably a porous sheet from the viewpoint of maintaining air permeability.

Patent Document 1 discloses a porous sheet for adsorbing a workpiece onto a support table, not for a ceramic green sheet but for a glass sheet. According to Patent Document 1, when the adhesive layer is partially provided on one surface of the porous sheet in advance, it is not only easy to arrange the glass sheet on the support table, but also to prevent the subsequent positional deviation (paragraph 0025). As the material of the subsequent layer, although a pressure-sensitive adhesive is preferable, a hot-melt adhesive or a thermosetting adhesive (paragraph 0025) can be used.

Patent Document 1: Japanese Patent Laid-Open No. 8-169971

It is convenient to apply an adhesive to the surface of the porous sheet disposed on the ceramic die suction mold to form an adhesive layer. In this case, when the ceramic green sheet is sucked through the opening of the metal mold, it is necessary to remove the adhesive in a portion corresponding to the hole portion of the porous sheet, and to form a through hole. If this point is considered, the adhesive layer is preferably thin. In order to form a thin adhesive layer, a hot-melt adhesive which is heated to lower the viscosity may be applied.

On the other hand, in order to separate the ceramic green sheets adsorbed on the porous sheet, it is necessary to apply an exhaust pressure to the ceramic green sheets through the opening of the metal mold. Therefore, the adhesion between the metal mold and the porous sheet is required to be not less than the pressure of the exhaust pressure. Therefore, it is desirable to form an adhesive layer excellent in adhesion to the surface of the porous sheet for ceramic green sheet adsorption.

However, as shown in FIG. 6, when the heated hot-melt adhesive 12 is directly applied onto the porous sheet 13, the hot-melt adhesive 12 enters the hole portion 19 of the porous sheet 13. Therefore, if the hot-melt adhesive 12 is not applied thickly, the hot-melt adhesive 12 is caught in the hole portion 19, and the contact area between the hot-melt adhesive 12 and the metal mold 16 becomes small, and sufficient adhesive force cannot be obtained.

When a sufficient amount of the hot-melt adhesive 12 is applied to secure the adhesion, the air permeability of the porous sheet 13 is difficult to secure. In other words, in order to cause the ceramic green sheet 17 to be adsorbed to the porous sheet 13, even if the opening portion 16a of the metal mold 16 is sucked (see the arrow in Fig. 6), the hot melt adhesive 12 is likely to remain in the hole portion of the porous sheet 13. 19, a sufficient number of through holes 18 cannot be formed in the adsorption film 20. When the air permeability of the adsorption film 20 is low, it is necessary to increase the degree of pressure reduction of the adsorption machine to strongly attract the ceramic green sheet 17. However, if attracted strongly, the ceramic green sheet 17 is easily deformed. If the ceramic green sheet 17 is deformed, the ceramic green sheet 17 is laminated. The upper electrode layer and the lower electrode layer are short-circuited, and the chip capacitor capacitance is lowered.

In view of the above circumstances, an object of the present invention is to provide an adsorption film which is suitable for adsorption on a metal mold or the like when adsorbed on a plate-like adsorbed body which is easily deformed like a ceramic green sheet, and a method for producing the same. The cushioning material of the board provides, in particular, an adsorption film excellent in adhesion and air permeability, and a manufacturing method thereof, and an adsorption film having a release film and a manufacturing method thereof.

The present invention provides a method for producing an adsorption film by applying a hot-melt adhesive heated to a predetermined temperature to a release film, and the hot-melt adhesive on the release film becomes lower than the predetermined temperature. The porous sheet is bonded to the hot-melt adhesive at a temperature, and a laminate in which the adhesive layer composed of the release film and the hot-melt adhesive and the porous sheet are laminated is formed. The release film is peeled off from the laminate to obtain an adsorption film formed by laminating the pressure-sensitive adhesive layer and the porous sheet.

Further, the present invention provides an adsorption film which is formed by laminating an adhesive layer composed of a hot-melt adhesive and a porous sheet; and an adhesion force of 0.8N for the adhesion test of the adhesive layer against stainless steel /25mm or more, the air permeability is 5cm ³ /cm ² ‧ seconds or more. Here, the pair of stainless steel adhesion test was carried out in accordance with the 180-degree peeling method prescribed in JIS Z0237, and the air permeability was determined by the Frazier method measurement prescribed in JIS L1096.

Moreover, the present invention provides a method for producing an adsorption film having a release film, wherein the adsorption film having a release film is coated on a release film by a hot melt adhesive heated to a predetermined temperature, and the release film is applied to the release film. And bonding the porous sheet to the hot-melt adhesive in a state where the hot-melt adhesive is at a temperature lower than the predetermined temperature, forming an adhesive layer composed of the release film and the hot-melt adhesive, and The porous sheet is sequentially laminated, and the release film can be self-adhesive layer The adsorption film formed of the porous sheet is peeled off.

Moreover, the present invention provides an adsorption film which is an adsorption film having a release film which is formed by sequentially laminating an adhesive film composed of a release film, a hot-melt adhesive, and a porous sheet, and The release film may be peeled off from the adsorption film composed of the adhesive layer and the porous sheet; wherein the adhesive layer of the adsorption film obtained by peeling the release film has an adhesion force of 0.8 N/by the adhesion test of the stainless steel. 25 mm or more, the air permeability is 5 cm ³ /cm ² ‧ seconds or more. Here, the pair of stainless steel adhesion test and the measurement of the air permeability are performed in accordance with the foregoing.

In the method for producing an adsorption film of the present invention, a hot-melt adhesive which is heated to lower the viscosity is applied onto a release film to form a thin and flat adhesive layer, and then an adhesive layer which is low in temperature and has an increased viscosity The porous sheet is bonded. Therefore, it is possible to suppress the hot melt adhesive from entering the pore portion of the porous sheet as compared with the case where the hot melt adhesive is directly applied to the porous sheet. Further, the adhesive surface of the adhesive layer formed by the above method has a high surface flatness even if the release film is peeled off. Therefore, even if the adsorption film of the present invention is formed to be thin in order to ensure air permeability, the adhesion of the adhesive layer is hard to be lowered.

1‧‧‧ release film

2‧‧‧Adhesive layer

2a‧‧‧Adhesive

3‧‧‧Porous tablets

4‧‧‧Adsorption film with release film

5‧‧‧Adsorption film

6‧‧‧Metal mold

6a‧‧‧ openings in the metal mold

7‧‧‧Ceramic embryos

8‧‧‧through holes

9‧‧‧ Hole Department

Figure 1 is a cross-sectional view of a release film.

Fig. 2 is a cross-sectional view showing a state in which a hot-melt adhesive is applied to form an adhesive layer on a release film.

Fig. 3 is a cross-sectional view showing an adsorption film having a release film obtained by laminating an adhesive sheet and further bonding a porous sheet.

Fig. 4 is a cross-sectional view showing an adsorption film obtained by peeling off a release film from an adsorption film having a release film.

Figure 5 shows the adsorption film loaded on the adsorption plate (metal mold) and attracted to the ceramic embryo sheet. Sectional view of the state.

Fig. 6 is a cross-sectional view showing a state in which a conventional adsorption film is placed on a metal mold and attracted to adsorb the ceramic green sheets.

Fig. 7 shows the state of the adsorption film produced in the comparative example by a scanning electron microscope.

Fig. 8 shows the state of the adsorption film produced in the examples by a scanning electron microscope.

Figure 9. Relationship between the amount of hot melt adhesive applied and the adhesion to stainless steel.

Fig. 10 is a graph showing the relationship between the coating amount of the hot melt adhesive and the air permeability of the adsorption film.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. First, a hot melt adhesive is applied to the release film 1 shown in Fig. 1 to form an adhesive layer 2 (Fig. 2). The release film 1 provides a flat surface required to apply a hot melt adhesive. The release film 1 is not particularly limited, and a resin film such as anthrone or polyethylene terephthalate can be used. The release film 1 is preferably non-porous in order to be removed during use.

The hot melt adhesive is applied in a heated molten state, cooled and solidified to form an adhesive layer 2. The hot-melt adhesive is not particularly limited, but can be used for exhibiting sufficient tackiness (adhesion) at normal temperature. For example, the hot melt adhesive is applied by spraying at a high temperature (170 to 200 ° C) and a high pressure (2 to 5 kg/cm ² ). When it is heated to the above extent and applied, the adhesive layer 2 having a uniform thickness is easily formed on the release film 1. Further, for example, the hot-melt adhesive may be partially applied to the release film 1 in, for example, a mesh shape or a scatter shape, and thereafter pressed against the entire film. In this case, the hot-melt adhesive can draw a fine pattern in which the line diameter (or the diameter constituting the scatter point) of the mesh or the like is 5 to 30 μm, and the interval between the lines (or dots) is about 5 to 100 μm. Coating.

The hot melt adhesive is applied in such a manner that the thickness of the adhesive layer 2 is 3 to 10 μm. The cloth is preferred. If the adhesive layer is too thin, the adhesion to the metal mold may be insufficient, and if it is too thick, the through holes may become difficult to form.

Next, as shown in FIG. 3, the porous sheet 3 is attached to the adhesive layer 2 to obtain an adsorption film 4 having a release film. Although the method of bonding the porous sheet 3 to the adhesive layer 2 is not particularly limited, for example, the release film 1 in which the adhesive layer 2 is formed and the porous sheet 3 are passed between a pair of rolls. Attached. At this time, since the hot-melt adhesive constituting the adhesive layer 2 is cooled and the viscosity is increased, and is fixed along one main surface of the release film 1, it is difficult to enter the hole portion 9 of the porous sheet 3.

As shown in Fig. 4, the release film 1 is peeled off from the adsorption film 4 having the release film of Fig. 3 to obtain the adsorption film 5. The adhesive layer 2 is transferred from the release film 1 to the porous sheet 3 due to the peeling of the release film 1. The surface 2a of the adhesive layer 2 connected to the release film 1 is an adhesive surface 2a having good flatness.

The porous sheet 3 is preferably a resin porous sheet, particularly a porous sheet of ultrahigh molecular weight polyethylene resin. The ultrahigh molecular weight polyethylene resin porous sheet has a lower friction coefficient than the rubber sheet, and has a longer life than paper or non-woven fabric. The ultrahigh molecular weight polyethylene has a molecular weight (viscosity average molecular weight) of about 1,000,000 or more.

The ultrahigh molecular weight polyethylene resin porous sheet is not particularly limited, but has a thickness of 0.05 to 0.5 mm, particularly preferably 100 to 300 μm, and an average pore diameter of 1 to 100 μm, particularly preferably 5 to 40 μm, and an arithmetic mean roughness. (Ra) is 0.5~1.2μm, compression elastic modulus (JIS K7181) is 100~1000kgf/m ² , especially 200~400kg f/m ² , and air permeability (JIS L1096) It is preferably 5 to 20 cm ³ /cm ² ‧ seconds.

Fig. 5 shows a state in which the adsorption film 5 is loaded on the metal mold 6 which is an adsorption plate of the adsorption machine. The adsorption film 5 is fixed by adhering the adhesive layer 2 to the surface of the metal mold 6. Adsorption The porous sheet 3 of the film 5 is pushed against the ceramic green sheet 7 to be conveyed. In this state, when the suction is started from the opening 6a of the mold 6 (see the arrow in FIG. 5), a part of the adhesive layer 2 is removed from the hole 9 of the porous sheet 5, and the adsorption film 5 is formed. Through hole 8. Next, the ceramic green sheet 7 is sucked through the through hole 8. In this manner, the ceramic green sheet 7 is adsorbed to the metal mold 6 and transported to a predetermined place, and the metal is applied from the metal by the exhaust pressure applied from the opening portion 6a (pressure is applied in the opposite direction to the arrow in FIG. 5). The mold 6 is separated.

In the adsorption film 5, the adhesive layer 2 is in contact with the adhesive surface 2a of the metal mold 6 with high flatness. Therefore, even if the thick adhesive layer 2 is not formed, it is possible to ensure sufficient adhesion with the metal mold 6. Therefore, even if the exhaust pressure for separating the ceramic green sheets 7 is applied, the adsorption film 5 is not peeled off from the metal mold 6.

The adsorption film 5 is preferably a stainless steel adhesion test (JIS Z0237 180 degree peeling method), and exhibits an adhesion of 2.0 N/25 mm or more and further 2.0 N/25 mm or more. Further, the adsorbed film 5 is preferably measured according to the method rich Laji Lu, to display more than 5cm ³ / cm ² ‧ seconds, further not less than ² ‧ seconds air permeability 5.5cm ³ / cm.

Hereinafter, the present invention will be specifically described by way of examples. However, the invention is not limited to the following examples.

(Comparative example)

The porous sheet is a porous sheet of ultrahigh molecular weight polyethylene resin (manufactured by Nitto Denko Corporation; thickness 0.22 mm, average pore diameter 20 μm, arithmetic mean roughness (Ra) 2.2 μm, compression elastic modulus 300 kgf/m ² , Air permeability 7 cm ³ /cm ² ‧ sec) The hot melt adhesive (Iridaine manufactured by YASUHARA CHEMICAL Co., Ltd.) was heated to 190 ° C and uniformly sprayed at a pressure of 5 k gf / cm ² . The coating amount of the spray was set to 7 g/m ² . The thickness of the adhesive layer thus formed is 7 to 8 μm.

The adhesive layer is cooled to room temperature, and the adsorption film is fixed to the metal mold by laminating the adhesive on the surface of the metal mold having the opening. Further, suction is started from the opening of the metal mold, and a part of the adhesive layer is removed to form a through hole. The adsorption film after the through holes were formed was observed with a scanning electron microscope. The results are shown in Figure 7.

(Example)

On the release film (RT-75S manufactured by Nitto Denko Corporation), a hot-melt adhesive (same as the comparative example) was uniformly sprayed in the same manner as in the comparative example to form an adhesive layer having a thickness of 7 to 8 μm.

After the adhesive layer is made to have a normal temperature and exhibits adhesiveness (viscosity), a porous sheet of ultrahigh molecular weight polyethylene resin (Sanmapu manufactured by Nitto Denko Corporation; the same as the comparative example) is laminated on the adhesive layer. When the pressure is applied, an adsorption film having a release film formed by sequentially laminating a release film, an adhesive layer, and a porous sheet is obtained.

Next, the release film is peeled off from the adsorption film having the release film to expose the adhesive layer. In this state, the adsorption film is fixed to the metal mold by laminating the adhesive on the surface of the metal mold having the opening. Further, suction is started from the opening of the mold, and a part of the adhesive layer is removed to form a through hole. The metal mold used and the conditions for suction from the opening were the same as in the comparative example. The results of observing the adsorption film after forming the through-holes by a scanning electron microscope are shown in Fig. 8 together with the comparative examples. Comparing Fig. 7 with Fig. 8, it can be understood that the adsorption film of the embodiment has formed a large number of through holes.

The adsorption film was produced by changing the coating amount of the hot melt adhesive for the examples and the conventional examples, respectively. Then, the adhesion of the adhesive layer (to the stainless steel adhesion force) and the air permeability were measured for the adsorption films. The stainless steel adhesion was carried out in accordance with the JI S Z0237 180 degree peeling method. Further, the measurement of the air permeability was carried out in accordance with the Fulajiru method (JIS L1096).

Next, the measurement results of the force are shown in Fig. 9. The measurement results of the air permeability are shown in Fig. 10. In the comparative example (conventional example) in which the hot-melt adhesive is applied directly to the porous sheet, it is difficult to achieve a gas permeability of 0.8 N/25 mm or more to the stainless steel adhesion force and 5 cm ³ /cm ² ‧ seconds or more. In terms of the transfer of ceramic green sheets, it is desirable to have both the adhesion and the degree of air permeability. On the other hand, in the case of applying the hot-melt adhesive to the release film, the above case can be achieved. 9 and 10, it is understood that the coating amount of the hot-melt adhesive is preferably about 3 to 10 g/m ² .

(industrial use)

According to the adsorption film of the present invention, the ceramic green sheets are easily adsorbed, transported to the same place, separated and laminated, and a wafer capacitor for a mobile phone or the like can be easily produced.

The manufacturing method of the electronic component (for example, a wafer capacitor) of the present invention comprises: adsorbing a ceramic green sheet to an adsorption plate loaded with the adsorption film of the present invention or the adsorption film obtained by the production method of the present invention in such a manner as to be in contact with the adsorption film and The steps of transporting and laminating are of great value in the industry.

1‧‧‧ release film

2‧‧‧Adhesive layer

3‧‧‧Porous tablets

4‧‧‧Adsorption film with release film

9‧‧‧ Hole Department

Claims (2)

An adsorption film formed by laminating an adhesive layer composed of a hot-melt adhesive and a porous sheet, and the adhesive force of the adhesive layer for a stainless steel adhesion test is 0.8 N/25 mm or more, and the air permeability is 5 cm. ³ / cm ² ‧ seconds or more; wherein the pair of stainless steel adhesion tests are carried out according to the 180 degree peeling method specified in JIS Z0237, which is determined by the Frazier method specified in JIS L1096 To decide. An adsorption film having a release film formed by laminating an adhesive layer and a porous sheet composed of a release film and a hot melt adhesive, and the release film can be from the adhesive layer and the porous sheet The adsorption film formed by the release film is peeled off, and the adhesive layer of the adsorption film obtained by peeling the release film has an adhesion force of 0.8 N/25 mm or more and a gas permeability of 5 cm ³ /cm ² ‧ seconds or more; Here, the pair of stainless steel adhesion test was carried out in accordance with the 180-degree peeling method prescribed in JIS Z0237, and the air permeability was determined by the Fulajiru method specified in JIS L1096.