WO2008032624A1

WO2008032624A1 - Sheet pasting device

Info

Publication number: WO2008032624A1
Application number: PCT/JP2007/067299
Authority: WO
Inventors: Yasushi Tabata; Koichiro Goto; Yoshio Kanda; Toshifumi Hosoya; Fumiaki Mizuno
Original assignee: Sumitomo Electric Industries, Ltd.
Priority date: 2006-09-11
Filing date: 2007-09-05
Publication date: 2008-03-20
Also published as: TW200827161A

Abstract

A sheet pasting device that even when a sheet with a pasting surface being substantially flat but locally having protrudent portions of given height is pasted to a flat substrate surface, produces a substantially flat sheet surface after pasting operation. The pasting device is one for pasting under pressure a substantially flat thin sheet with a pasting surface locally having protrudent portions of height being 5 to 30% of the thickness thereof to a flat substrate surface via an adhesive layer, which sheet pasting device has a pressurization part of below 50 surface hardness according to the standard of JIS K6253, being covered by an elastomer layer of thickness equal to 100 to 500 times the height of the protrudent portions.

Description

Specification

Sheet pasting device

Technical field

[0001] The present invention relates to an apparatus for sticking a substantially flat sheet having a partially convex portion on a flat substrate with excellent adhesion.

Background art

[0002] A method of attaching a sheet to the surface of a substrate via an adhesive layer has been developed in accordance with the practical function and form of a product. For example, in JP-A-7-272625 (Patent Document 1), a resin sheet such as PET (polyethylene terephthalate), which is flat on the surface with fine irregularities, is pressurized with a rubber roller while conveying a glass bulb. Introducing the means to stick while suppressing the inclusion of foreign materials and the generation of wrinkles on the sheet! In this example, it is devised to absorb the irregularities and curvature of the valve surface to which the rubber sheet mounted on the roller is attached. Based on this, it is suggested that if the hardness of the rubber of the roller is too high, bubbles will be embraced or wrinkled at the end in the width direction, and the transparency after coating cannot be secured together with the adhesive strength. As an example, while a 250 mm wide valve is fed at a speed of 1800 mm per minute, a polyurethane sheet with a thickness of 20 m is passed through a 40 m adhesive layer, the surface hardness is 50 or less, and a rubber roller with a thickness of 10 mm is 55 kg (width) The means of applying the load with a load of more than 2.2 kg / cm) is introduced.

[0003] Japanese Laid-Open Patent Publication No. 6-55721 (Patent Document 2) discloses a photo-artificial stone decorative article in which a photograph is placed on an artificial marble through a resin layer containing natural stone powder and covered with a transparent resin layer. Means for making are disclosed. In order to pass through the transparent resin layer so that the photograph image can be clearly seen, it is necessary to prevent bubbles from remaining in the resin layer. For this reason, when curing the resin layer, place the photo-coated workpiece on which the resin layer is applied on the printing stand, press the frame with a flexible sheet on the application surface, and print with the pressure roller. To degas. At that time, the peripheral end portion of the frame body is evacuated from the outside through the suction hole of the printing stand. For this reason, the sheet is in close contact with the resin layer on the workpiece so as to wrap it, and the mechanism is designed to promote defoaming from the resin layer. [0004] Further, Japanese Patent Laid-Open No. 2005-163538 (Patent Document 3) discloses that when a fiber reinforced plastics (FRP) sheet is lined on a concrete wall in a tunnel via an ultraviolet ray curable adhesive layer, A method for removing bubbles remaining at the fortune-telling interface is introduced. For example, a method is disclosed in which a release sheet is pasted on a sheet in advance, the pressure-sensitive adhesive layer is cured while defoaming by pressing with a roller, and then the release sheet is peeled off.

Patent Document 1: Japanese Patent Laid-Open No. 7-272625

Patent Document 2: JP-A-6-55721

Patent Document 3: Japanese Patent Laid-Open No. 2005-163538

Disclosure of the invention

Problems to be solved by the invention

[0006] As in the above example, when a sheet is attached to protect the product, it is necessary to improve the adhesion of the sheet to the base material (the ability to contact the two bonding interfaces without any gaps). The same applies to the case where a functional part such as an electronic circuit or printed display having a predetermined thickness is formed on the sheet after the sheet is attached to the substrate surface. In either case, it is important to prevent the sheet from lifting from the base material by allowing the foam to remain at the interface between the base material and the sheet, and for the expansion and contraction during pasting to return. The quality of adhesion depends on, for example, surface undulation, adsorbed moisture, dirt, and other surface forms of the substrate and the sheet, and greatly affects the practical function and durability of the product after application.

[0007] A means that has been conventionally recommended for avoiding the expulsion of bubbles and the return due to expansion and contraction of the sheet is uniform pressurization with a roller, as described in the above patent documents. However, most of them are examples of attaching flat sheets. For example, Patent Document 1 suggests a means for flexibly changing the hardness and thickness of the rubber of the roller according to the surface undulation of the sheet. However, it is difficult to make the surface of the sheet almost flat after shelling if the sheet has partial undulations. The means of Patent Documents 2 and 3 are also cases where there is no undulation in the sheet, and the same can be said as in Patent Document 1. An object of the present invention is a case where a thin sheet with a convex part having a height of 5 to 30% of the thickness is attached to a flat substrate surface, although the surface to be attached is substantially flat. However, no air bubbles remain at the shell-occupied interface, no wrinkles are generated on the sheet, and a substantially flat sheet surface can be formed after shell-occupying. It is to provide an attachment device.

Means for solving the problem

[0008] In the present invention, a substantially flat sheet having a convex part having a height of 5 to 30% of its thickness is partially formed on the surface of the shell-dividing surface, and an adhesive layer is formed on the surface of the flat base material. This is an affixing device that applies pressure while pressing, and is an elastic body layer having a surface hardness force S of less than 50 based on JIS K6253 of the pressing part, and a thickness of 100 to 500 times the height of the convex part. It is a pasting device that is covered. In addition to the above, the present invention also includes a bonding apparatus in which a groove to be connected to the outer periphery is formed on the surface of the base material to be bonded, and further a surface bonding force of the surface of the base material to be bonded is formed of a soft material. Including. Further, the present invention includes a sticking apparatus in which the pressing portion is a roller pressing method and the contact line pressure S with the sheet of the pressing portion on the roller surface is 2 kg / cm or less. Further, the present invention includes those containing the elastic layer laminar silicone rubber.

[0009] The object to be pasted according to the present invention is "a substantially flat sheet having a convex portion partially having a height of 5 to 30% of its thickness on the surface to be pasted". “Partially” corresponds to an area within 40% of the shell-occupying surface. “Substantially flat” means that there is a convex portion partially over an area of 40% and the remaining surface is flat. Here, the area of the region having the convex portion includes its base portion. The meaning of “flat” in the present invention is defined below, but the term “flat” used for the surface of the substrate in the present invention is also synonymous. Further, when “thin sheet” is particularly indicated in the present invention, it means a sheet having a thickness of 0.5 mm or less.

In the present invention, “flat” means a state in which the maximum height Δt of the convex portion in the thickness direction of the sheet or substrate to be attached is 10 m or less. The flatness of the sheet surface before shelling is measured by the following procedure. First, a rectangular strip sheet is cut out and prepared. Next, the sheet is placed on the surface plate, and the distance t (substantially sheet thickness) between the upper surface of the sheet and the base point in two diagonal directions of the surface is confirmed at equal intervals with the surface of the surface plate as the base point. Data may be recorded continuously and read. The measuring means may be either a contact type or a non-contact type that is usually used. However, in the case of a contact type that makes contact with the measuring surface such as a dial gauge, the contact portion makes surface contact in parallel with the measuring surface. Use terminals. From the recorded data, check the arithmetic average value t of t (reference thickness, unit is m) and the maximum value (unit is m).

0 max

Check the maximum height of the convex part At, that is, (t — t). The smaller this value is, the flatter is there. If the measuring surface of the sheet is not rectangular, the measuring direction should match the shape of the sheet surface, and the direction along the longest section line on the surface should be included in one of the measuring directions. For example, when the sheet surface is circular, two directions perpendicular to each other along the diameter are selected, and when the sheet surface is elliptical, two directions along the major axis and minor axis are selected. The flatness of the sheet surface after pasting is the distance from the base plate base point to the sheet surface, using the same procedure as for the sheet before pasting, with the one pasted on the base material placed on the surface plate. (Total thickness of sheet, base material and adhesive layer) and check the arithmetic average value t and maximum value t force At

0 max

(T t) is calculated. In this case, the thicknesses of the adhesive layer and the base material are offset, and the max.

Assuming that the variation in each measurement is small compared to that of the sheet, there is almost no influence on At.

[0011] According to the present invention, the surface on which the shell occupies is almost flat. This is a case where a sheet having a convex portion having a height of 5 to 30% of the thickness is partially attached to a flat base material surface. However, it is possible to provide a sheet affixing device in which bubbles do not remain at the affixed interface, wrinkles are not generated on the sheet, and a substantially flat sheet surface can be formed after shelling. For this reason, it is possible to provide a sticking member having excellent adhesion between the sheet portion and the base material portion. If a transparent sheet is used, a covering member having excellent translucency can be provided. Furthermore, it can be used when both the sheet and the base material are flat, so the object to be pasted can be greatly expanded.

Brief Description of Drawings

[0012] FIG. 1 is a diagram schematically showing a state of application of a roller method used in an example of the present invention.

[Fig. 2] An overview of the state of an adhesion test sample of an example of the present invention.

FIG. 3A is a top view of the shape of the convex portion of the sheet of the example of the present invention.

FIG. 3B is a top view of the shape of the convex portion of the sheet of the example of the present invention.

FIG. 3C is a top view of the shape of the convex portion of the sheet of the example of the present invention.

FIG. 3D is a top view of the shape of the convex portion of the sheet of the example of the present invention.

FIG. 3E is a top view of the shape of the convex portion of the sheet of the example of the present invention.

Explanation of symbols [0013] 1 sheet

2 Adhesive part

3 Base material

4 Pressure roller

5 Elastic layers

6 Roller drive

11 Convex part

BEST MODE FOR CARRYING OUT THE INVENTION

[0014] Hereinafter, a configuration example of the apparatus of the present invention will be described. The apparatus of the present invention can be applied to various sheet materials such as paper, resin, metal, and composite materials and laminates thereof. Although the sheet is almost flat, a part of the bonding surface has a convex part having a height in the thickness direction of 5 to 30% of the thickness. The ratio of the surface occupied by the convex portions in the same plane is usually 40% or less, but if the height in the thickness direction is within the above range, the shape of the convex portion viewed from above is, for example, Various things such as a line shape, a band shape, and an island shape are allowed. Note that the area of the convex portion includes the bottom when viewed from above. The height in the thickness direction of the convex portion of the sheet is set to 5 to 30% of the thickness of the sheet. If the height is less than 5%, the above-described effect can be achieved even with a normal pressing means for a flat sheet as a whole. Because. On the other hand, if it exceeds 30%, the surface force S on the opposite side of the sheet corresponding to the convex portion after shelling is difficult, and it is difficult to become flat.

[0015] An adhesive layer may or may not be formed in advance on the affixing surface of the sheet handled by the apparatus of the present invention before shelling. The thickness of the pressure-sensitive adhesive layer when shelling is not limited, but is preferably larger than the height of the convex portion in the thickness direction. Thereby, the return stress of the convex portion of the sheet can be absorbed to some extent by the adhesive layer. Of course, the material of the adhesive layer and the form of the convex portion need to be changed according to the practical purpose. For example, if the sheet is temporarily fixed for printing an electronic circuit or the like, for example, a weak adhesive such as a pressure sensitive adhesive is used so that it can be easily separated after the fact. For example, if it is permanently fixed, use a thermosetting adhesive so that it does not peel off. Furthermore, for example, a flexible printed circuit sheet on which electronic circuits are printed is pasted on a substrate. When soldering and mounting, it is necessary to consider heat countermeasures and solder flow countermeasures.

[0016] In the pasting process using the apparatus of the present invention, air bubbles may easily remain in the adhesive layer depending on the material of the sheet, the shape of the convex portion, and the surface state of the substrate. For example, when small convex portions are partially concentrated, when the substrate surface is hard, or when using a sheet having high elasticity, bubbles tend to remain on the convex portions and the periphery thereof. In such a case, it is desirable to form a groove connected to the outer periphery on the surface of the substrate. As a result, bubbles can be actively expelled by the flow of the pressure-sensitive adhesive layer together with pressurization. Furthermore, it is desirable to make the surface of the substrate soft. Accordingly, the return stress of the convex portion of the sheet can be absorbed smoothly by the adhesive layer, and new bubbles can be prevented from being held.

[0017] Means for forming grooves on the substrate surface include (1) a method of forming grooves directly on the surface of the substrate by a chemical method such as etching or a physical method such as laser irradiation or machining, 2) A method of forming a coating layer on the surface of the substrate masked with a desired groove pattern by printing or vapor deposition, and (3) A method of attaching a pattern groove! /, Thin! /, Or attaching a film and so on . As long as the pattern of the groove in the surface direction is connected to the outer peripheral direction of the base material surface, any pattern may be used. The overall in-plane pattern seen from above has a grid-like shape, central force, and a force that spreads radially, etc. To draw a smoothly connected curve toward the outer circumference as much as possible when viewed from above Then, the flow of the pressure-sensitive adhesive layer becomes smooth and bubbles are easily expelled. For example, when the convex portions are partially concentrated, the convex portions are smoothly connected from the portion toward the outer circumference and radially extended. For example, when pressure is applied in one direction with a roller squeegee, a groove is formed along the direction in which the pressurization proceeds. Various other patterns can be considered on a case-by-case basis. The cross section of the groove seen from the thickness direction can be considered to have various shapes such as V-shape and U-shape. The width and depth of the opening end should be larger than the height of the convex portion of the sheet. In particular, the depth of the groove is desirably in the range of 125 to 150% of the height of the convex portion. If it is less than the lower limit, the variation in pressure within the surface to be pressurized increases with repeated pressurization, and defoaming may become difficult. When the upper limit is exceeded, as the pressure is repeatedly applied, it becomes easier for a new bubble to be embraced by the return of the attached sheet, or the sheet may be easily deformed locally at the groove. Put the groove in the pattern Similarly, it is desirable that the thickness of the covering layer and the thickness of the grooved adhesive film be larger than the height of the convex portion of the sheet.

[0018] It is desirable to form grooves on the surface of the base material as described above and to have appropriate flexibility. The desired surface hardness is less than 70 on the basis of JIS K6353. It should be higher than the surface hardness of the pressure part. For example, there are silicone resin, natural rubber, neoprenego, and mu, and these materials may be used for the base material depending on the application. When using a substrate having higher hardness, a layer containing a soft material component is formed in advance on the bonding surface of the sheet. The means includes (4) a method of forming a new soft material layer on the substrate surface by printing or vapor deposition, and (5) a method of attaching a soft material film to the substrate surface. Furthermore, (6) there is a method in which the soft material layer is formed into a functionally graded composite layer of the base material and the soft material. In this case, the component amount of the soft material is increased toward the surface. As a result, the interface between the surface and the base material is made continuous, and the bonding reliability of the both becomes high, so that it is suitable, for example, in the case where a cooling load is involved in processing after bonding or practical use. When both the soft material layer and the groove are formed, the means (1) to (3) for forming the groove and the means (4) to (6) for forming the soft material layer are combined. You can go back and forth! /. For example, (4) and the above-described groove forming means (2), (5) and the above-described groove forming means (3) are each accompanied by a common operation, and therefore are simultaneously or in series with each other. Can also proceed

Yes

[0019] In the apparatus of the present invention, pressure is applied at the time of attachment. At that time, the surface of the pressing part is covered with an elastic body having a surface hardness of less than 50 based on JIS K6253, and the thickness is 100 to 500 times the height of the convex part of the sheet. The reason why the surface hardness of the pressing part is less than 50 based on JIS K6253 is that if it exceeds this, bubbles remain near the convex part interface of the sheet, or wrinkles occur when the sheet returns after shelling. This is because the sheet does not adhere, and it becomes easy to float or to hold air bubbles. The thickness of the elastic body is within the above range, depending on the shape of the convex portion when shelling, without restricting the movement of the adhesive layer that tries to go around it, and the convex shape of the sheet This is because the stress concentrated on the portion is absorbed and relaxed and dispersed in the flat portion of the sheet. The force depending on the material of the adhesive layer and the sheet The surface hardness is preferably 20 or more. The surface of the pressurizing part is along a flat surface, curved surface, or convex part depending on the form of the convex part of the sheet. Various outer ring shapes can be formed in three dimensions, such as a concave recess or a through hole. The elastic body may be, for example, a panel with a built-in panel, depending on the case where force is normally used. Furthermore, when the surface of the elastic body is easy to stick to the sheet, it is easy to prevent the sticking when it is pressed against the sheet. Therefore, it is desirable to select a surface elastic body that is difficult to adhere to the sheet. In consideration of the above, a material containing a silicone rubber or fluororubber material is preferable. However, even if the elastic body itself is sticky, it can be used by placing a non-sticky layer on the surface. For example, natural rubber or urethane rubber is coated with polytetrafluoroethylene (PTFE).

[0020] The pressurizing means may be any one that satisfies the above conditions. In the case where the sheet is continuously conveyed and moved, there are, for example, a method in which pressure is applied by a roller and a method in which pressure is applied stepwise by a multistage punch. In addition, for example, when individually pressing strip-shaped sheets, there are a method of pressing with a squeegee and a method of applying a surface pressure for a predetermined time with a single punch. The contact line pressure when applying pressure along the surface with a roller or squeegee is preferably 2 kg / cm or less. If this contact line pressure is exceeded, the adhesive layer will be deformed in the vicinity of the convex part when it is pasted, restricting the movement of the adhesive layer, inhibiting defoaming, or giving the sheet an unreasonable elongation. This is because it tends to cause peeling and wrinkles due to the return of the water. The contact line pressure varies depending on the material and thickness of the sheet, the form of the substrate surface, etc., but is generally 0.05 kg / cm or more in order to suppress residual bubbles and sheet return after application. Is desirable. The desirable upper limit is 1.5 kg / cm or less. The “contact line pressure” is used here because the contact between the roller and the squeegee and the sheet is linear. Therefore, this value is the value obtained by dividing the applied load [kg] by this length L, where L is the length of the contact line. Depending on the material of the sheet, the shape of the convex portion, and the material of the adhesive layer, there may be cases where heating or light irradiation is performed in addition to pressurization.

[0021] Examples of the convex portion of the sheet handled by the apparatus of the present invention include a peripheral edge on the opposite surface that is generated when a through-hole recess is formed for folding and cutting after shell-dividing and mounting components. Bulge (such as burr). In the case where a functional part is formed by printing a pattern such as an electronic circuit on the surface having the convex portion at the same time, it is desirable that the surface be flat. In such a case, if the apparatus of the present invention is used, a sheet having a convex portion as described above is used. However, if the height in the thickness direction is 30% or less, a desired flatness level can be easily obtained. Hereinafter, the present invention will be described by way of examples, but the present invention is not limited thereto.

Example 1

[0022] A long sheet original fabric having a width of 80 mm and a thickness of 200 μm made of paper, polyethylene terephthalate (hereinafter abbreviated as PET) and pure aluminum (A1) was prepared. These raw sheets were fed from a roller to a molding machine and cut into strips with a length of 160mm along with preliminary surface preparation. By this preliminary processing, a plurality of types of sheet specimens having the types and heights as described in the “convex portion” column of Table 1 were obtained on one side of the sheet. Note that the burrs at the cut-off end were a force that allowed them to come out on the surface with the convex part, and the height was about 3 m at the maximum. When the flatness of these sheets was confirmed in a diagonal direction using strip-shaped sheets cut to a length of 160 mm, the maximum height At in the thickness direction was 10 m or less in all cases.

[0023] These specimens were used to reinforce glass fiber with 20 sheets each under the 35 conditions shown in Table 1, 100 mm wide, 155 mm long, 2 mm thick, and a fluororubber layer formed on the surface. On the flat substrate made of Poxy resin, the surface with the convex portion was pressed and stuck through the adhesive layer. Although the substrate surface is flat, irregularities of AtlOm or less are formed. When pasting, make sure that sheet 1 fits in the center of the adhesive layer 2 in the width direction, as shown in Fig. 2, and the end in the length direction of the sheet protrudes to the front (arrow direction in Fig. 2). Pasted like so. The broken line portion 11 is a convex portion of the sheet. FIG. 1 is a diagram schematically showing the state of application of the roller method used in this example. In the figure, 1 is a sheet, 2 is an adhesive portion, 3 is a base material, 4 is a caloric pressure roller, 5 is an elastic layer coated on the roller, and 6 is a driving portion of a roller such as an air cylinder. In the example of this drawing, the vicinity of the convex portion of the sheet is a cross-section as shown enlarged on the right side of the drawing, and there is a convex portion (protrusion) below the sheet.

[0024] The form of the convex portion of the sheet used is five types of "Linear", "Multi-point", "Point-shaped", "Strip-shaped" and "Depression" shown in the type column of Table 1. This is shown in 3A-E. The figure is a top view, and the round frame on the right is an enlarged view of the vicinity of the convex part. The blacked out part in the frame is a through hole. What is displayed as “Linear” is the longitudinal direction in the center of the sheet in the width direction as shown in Fig. 3A. An archipelago-like through hole is lined up in a straight line. The width of the through hole is about 0.5 mm, the length is about 1 mm, and the distance between the opened holes is 1 mm. A peripheral portion of the through hole has a cone-shaped convex portion with a skirt having a width of 0.1 mm, and the height in the thickness direction is 8 to 70 111 as shown in Table 1. As shown in Fig. 3B, the "dot" is displayed at the same position on the line as the round through hole S with a diameter of 0.5 mm, and the gap between the open ends is 0.5 mm. Is open. A peripheral portion of the through-hole has a convex portion with a width of 0.1 mm, and its height in the thickness direction is 20111. As shown in Fig. 3C, the "strip" is displayed in the same position as the linear one, with a 5mm gap between the ends in the width direction at the same position as the linear one. The archipelago-like through-holes of the book extend straight. At the periphery of the through-hole, there is a convex part with the same size as the linear one, and its height in the thickness direction is 20 m. As shown in FIG. 3D, the “recess” is formed with the same outer ring shape and spacing as the dotted one, with a round recess force S and a depth of about 30 m. There is a cone-shaped convex part with a skirt with a width of 0.1 mm at the peripheral part of the depression, and its height in the thickness direction is 20 111. Furthermore, as shown in Fig. 3E, pits with the same shape as in Fig. 3D and with convex portions with the same height in the thickness direction are aligned in a grid pattern vertically and horizontally as shown in Fig. 3E. Many are formed and attached. In this case, the occupation ratio of the convex portion including the skirt portion on the sheet surface is about 40%.

[table 1]

Specimen Sheet Adhesive layer Pressurizing and pasting Product number Material Convex part Material Thickness Method Pressurizing part Load Sea Bubble

Type Height Thickness (! 丄 m) Material Surface Thickness

(μm) Ratio Hardness Magnification Flatness

(%) (Hs) times

1 Paper Linear 20 10 A 50 R0 and SIR 40 250 Wire 1.5 5 © ◎

2 A1 wire 20 10 A 50 R0 and SIR 40 250 wire 1.5 ◎

3 PET wire 20 10 A 50 ROL SIR 40 250 wire 1.5

4 PET multipoint 20 10 A 50 R0 SIR 40 250 wire 1.5 5

5 PET dotted 20 10 A 50 RO SIR 40 250 wire 1.5 ◎

6 PET strip 20 10 A 50 RO SIR 40 250 wire 1.5

7 PET depression 20 10 A 50 ROL SIR 40 250 wire 1.5 5 φ 8 PET linear 8 4 A 50 RO SIR 40 250 wire 1.5

9 PET wire 10 5 A 50 RO SIR 40 250 wire 1.5 ◎

10 PET line 40 20 A 50 RO SIR 40 250 line 1.5 ◎

11 PET wire 60 30 A 50 ROL SIR 40 250 wire 1. 5 ○ ○

* 12 PET wire 70 35 A 50 RO SIR 40 250 wire 1.5 Δ X

13 PET wire 20 10 A 50 ROL SIR 10 250 wire 1. 5 ○ ○

14 PET wire 20 10 A 50 ROL SIR 20 250 wire 1.5 〇

15 PET wire 20 10 A 50 ROL SIR 30 250 wire 1.5 ◎

16 PET wire 20 10 A 50 ROL SIR 45 250 wire 1. 5 © ◎

* 17 PET linear 20 10 A 50 ROL SIR 55 250 line 1.5 X X s PET linear 20 10 A 50 RO and SIR 40 80 line 1.5 ΔX

19 PET line 20 10 A 50 RO SIR 40 100 line 1.5 5

20 PET wire 20 10 A 50 ROL SIR 40 300 wire 1.5 ◎

21 PET wire 20 10 A 50 RO SIR 40 500 wire 1.5 ◎

^ 22 PET wire 20 10 A 50 RO SIR 40 550 wire 1.5 X X

23 PET wire 20 10 A 50 ROL SIR 40 250 wire 2.5 ○ Δ

24 PET line 20 10 A 50 RO SIR 40 250 line 2. 0 〇

25 PET wire 20 10 A 50 RO SIR 40 250 wire 1. 0

26 PET line 20 10 A 50 ROL SIR 40 250 line 0.5 ◎

27 PET wire 20 10 A 50 RO and SIR 40 250 wire. 1 ◎

28 PET wire 20 10 A 50 ROL SIR 40 250 wire. .05 〇〇

29 PET wire 20 10 A 50 ROL SIR 40 250 wire 0.03 △ Δ

30 PET wire 20 10 B 50 ROL SIR 40 250 wire 1.5 ◎

31 PET wire 20 10 A 15 RO SIR 40 250 wire 1. 5 ○ ○

32 PET wire 20 10 A 20 ROL SIR 40 250 wire 1.5

33 PET wire 20 10 A 30 ROL SIR 40 250 wire 1.5 ◎

34 PET 20 10 A 50 SQZ SIR 40 250 Surface 0.2 ◎

35 PET linear 20 10 A 50 PRS SIR 40 250 surface 0.2

* Indicates comparative sample

Explain the display on the horizontal axis in Table 1. Samples with * in front of the sample numbers in the table are comparative examples of the present invention. “Paper”, “PET” and “A1” in the material column of the sheet are as described above. The height of the convex part is the maximum value of the protruding height in the thickness direction of the convex part. The ratio is the ratio (%) of the value to the sheet thickness (average value). The kind of convex part is as above-mentioned. “A” in the “Material” column of the adhesive layer is “Millable Silicone Rubber” manufactured by Nippon Electrochemical Co., Ltd. “B” is bonded by “Threebond 2082C Room Temperature Curing Type Two-Part Epoxy Resin High Shear Adhesive Type” manufactured by ThreeBond Co., Ltd. It is an agent. The “thickness” of the adhesive layer is an estimated thickness after pressing, and is a value calculated by subtracting the thickness from the total thickness including the sheet and the base material. “ROL”, “SQZ”, and “PRS” in the “Method” column for pressure pasting are the methods using a roller that presses the contact surface pressure sequentially from one side to press the surface of the sheet. This is a squeegee method in which contact pressure is applied while sliding the sheet surface while pressing, and a press method in which the surface pressure is gradually applied to the entire surface by a cam type press. “SIR” in the material column indicates a silicone rubber-based material, and indicates that a silicone rubber-based material was used for the contact surface with the sheet of the pressurizing portion. As shown in the table, the Hs hardness of the surface is adjusted to 10 to 55, and a silicone rubber material is used.

[0027] The numerical value in the thickness ratio column of the pressing part is a value (%) obtained by dividing the thickness of the elastic layer of the pressing part of each sample by the height of the convex part of the sheet. For example, “Line 1.5” in the load column indicates that the contact line pressure with the sheet applied with a roller or squeegee is 1.5 kg / cm. In this embodiment, a roller squeegee is applied to the entire width direction of the sheet and moved in the length direction of the sheet, so this value is a value obtained by dividing the total load applied by 80 mm, that is, 8 cm. For example, “surface 0.2” indicates that the pressure applied in the press method is 0.2 kg / cm ² . This value is divided one was I straight load-loaded in the bonding area of the sheet 124cm ² (15. 5cmX 8cm).

[0028] Twenty specimens for each sample number bonded in the form as shown in Fig. 2 were bonded to the substrate under the respective pressure conditions described. In this state, the 10 specimens are the remaining flatness of the sheet surface after pasting and the remaining bubbles using a 100x optical microscope (each sample has 2 corners in the diagonal direction of the sheet and 3 fields at the center). The presence or absence was confirmed. The results are shown in the “sheet surface flatness” column and “bubble presence / absence” column in Table 1. In the “Flatness of sheet surface” column, the ratio of the change from the original sheet surface level to the post-pasting level was confirmed, and the magnitude of the change was displayed in stages by © ΟΔΧ. ◎, ○, △, and X indicate values of less than 1%, 1% or more and less than 3%, 3% or more and less than 5%, and 5% or more, respectively. Also For the presence / absence of bubbles! /, The degree of generation of bubbles confirmed to exist within the total area of the field of view was indicated in stages by ◎, ○, Δ and X. When ◎ is not confirmed, ○ is confirmed at several points around the convex part, △ is confirmed at several points around the convex part and other parts, X is around the convex part And the case where 10 points or more are confirmed in other parts.

[0029] Although not shown in the table, the remaining 10 test pieces were subjected to a peeling test after clamping both ends of the substrate in the width direction to a jig. In the peel test, the entire width direction of the sheet edge protruding from the edge of the substrate explained in Fig. 2 is held by a soft rubber arm, and the sheet is pulled vertically at a speed of 10 mm / min with a tensile tester. The method was performed by checking the load at which the sheet started to peel from the substrate. As a result, the level was 2 kg or more for the inventive sample and less than 80% for the comparative sample.

[0030] It should be noted that various soft materials or laminated composite materials that use natural rubber, neoprene rubber, etc. in addition to silicone rubber and that conform to the hardness of the present invention are pasted on the surface of the pressure part, and the same sheet material as Samples 1 to 3 Then, under the convex part and the pressurizing condition, a test for adhering 1000 sheets was performed using the apparatus of the present invention. The flatness of these samples, the presence of residual bubbles, and the level of peel strength were almost the same as those of Samples 1 to 3. However, with materials other than silicone rubbers, there were materials that adhered to the PET material sheet slightly and that surface roughness occurred as the number of sheets increased.

[0031] Although not shown in the table, separately prepare 20 sheets each of the same paper, anoleum, PET force, etc. as Samples 1 to 3 in Table 1, which are 100 mm wide, 155 mm long, 2 mm thick SUS304 and alumina ceramics with the same outer dimensions as above, on which a fluororubber layer with irregularities of AtlO m or less was formed on the surface (Mg 02 mass%, SiO 3 mass%, balance Al O

The surface with the convex portion on the flat base material of the sintered body having the chemical composition 2)

Three

In the same manner as the materials 1 to 35, they were applied with pressure through an adhesive layer and evaluated. The result was almost the same as Samples 1-35.

[0032] From the above results, the following can be understood. (1) By making the surface hardness Hs of the pressing part less than 50, if the height of the convex part is 30% or less of the thickness, the undulations of the convex part are absorbed and the shell is occupied. Ability to attach S. As a result, the sheet surface on the side opposite to the bonding surface is flat. The degree of adhesion can be maintained almost at the initial level, and can be applied with a degree of adhesion that has practically no problem. (2) This can be achieved without any problem if the convex portion protrudes from the periphery of the through hole and / or the depression, as long as it is within 40% of the sheet surface. (3) When affixing using the roller pressurization method, the contact linear pressure with the sheet is 2 kg / cm or less. It is desirable in terms of flatness and peel strength. (4) As the elastic body of the pressure-applying part, a silicone rubber-based material is easy to use, and the appropriate thickness is between 100 and 500 times the height of the convex part of the sheet.

Example 2

[0033] A sheet made of paper, pure aluminum, and PET in the same shape as in Example 1 and in the same convex shape as that of Sample 4 in Example 1 (form of Fig. 3E) Prepared. Irregularities of AtlOm or less are formed on the surface of these base materials. 5,000 sheets of these substrates and sheets were continuously pasted under the same roller pressure conditions as Sample 4 in Example 1 using the 23 combinations shown in Table 2 and evaluated almost the same as Sample 4 in Example 1. Went. Specifically, as described in the column “Paste” in Table 2, the flatness of the sheet surface and residual bubbles were confirmed by the same procedure as in Example 1. Note that “the number of poems with bubbles remaining in the sheet after 5000 sheets” is the number of specimens in the above-mentioned ◯, △, and X stages. By the way, all the specimens with bubbles remained were confirmed on the 4000th and subsequent specimens from the start of shelling.

[0034] The contents of the table will be described along the horizontal axis. The sample number is displayed in the leftmost column.

The base material column displays the base material material of the base material. “GREP”, “F rubber”, and “Alumina” indicate the same glass fiber reinforced epoxy resin as in Example 1, in order. The same fluororubber as the base material surface layer of Example 1 and the same alumina ceramic as Example 1. In the surface layer column, the material of the layer formed on the entire surface of the base material surface to be pasted is displayed. In this column, “F rubber”, “SCN”, and “natural rubber” are the same fluororubber, silicone resin, and natural rubber as the base material surface layer of Example 1 in this order. The numerical value in parentheses after “SCN” indicates the surface hardness Hs based on JIS K6253 of the silicone resin material in which the quantitative ratio between the organic functional group and silicon element is controlled. For example, “SCN (25)” The one marked with "" indicates a silicone resin having the same surface hardness of 25. Sample numbers 10, 11, and 23 are all base materials without a surface layer, and the displayed base The material is used. Concavities and convexities of AtlO ^ m or less are formed on the surface layer of all base materials. An adhesive layer with a thickness of 50 Hm is formed on this surface with the adhesive of B used in Example 1 (“ThreeBond 2082C room temperature curing type two-component epoxy resin high shear adhesive strength type” manufactured by ThreeBond Co., Ltd.) did.

[Table 2]

“One” in each column of surface processing indicates the case where the corresponding groove or soft surface processing is performed. In the column of the processed groove pattern, the mold force ^s of the entire groove pattern on the formed surface is displayed. In the processed groove shape column, the cross-sectional shape (cross section) of the groove, the width (width) opened on the substrate surface of the processed groove, the depth in the thickness direction of the groove, and the distance between the ends of adjacent grooves (groove Interval) Each is displayed. The cross sections of the grooves were all U-shaped, the widths of the grooves were all 20 111, and the intervals between the grooves were all 2000 m (2 mm). In the sample indicated as “double-line” in the processed groove pattern column, the groove forming the U-shaped cross-section with the described width and depth is along the direction in which the entire pasting surface is pressed with a spacing of 2000 m. They are formed in parallel. What is displayed as “cross-cut” is a groove with a U-shaped cross-section with the stated width and depth, arranged in parallel in two directions perpendicular to each other on the entire pasting surface with a spacing of 2000 m It is. One of the two directions in this case is the direction in which pressure is applied.

Sample No. 17, labeled “Composite 1” in the column of soft surface processing, contains 50 SCN (50) granules with an average particle size of 10 m in a matrix of epoxy resin with a melting temperature of 250 ° C. Laminar force of a composite material uniformly dispersed by volume% obtained by being formed on a GREP substrate. This composite material is obtained by heating and mixing 50 volume% of the above-mentioned average particle diameter of SCN (50) and 50 volume% of the epoxy resin at a temperature equal to or higher than the softening point of the epoxy resin. Sample No. 17 was prepared by placing the composite material plate and substrate in a mold heated above the softening point of the epoxy resin, and thermocompression bonding to the substrate surface with a thickness of 100 m simultaneously with the groove formation. can get. Sample No. 18 labeled “Composite 2” is the same epoxy resin as Sample 17 and three layers with different compounding amounts of SCN (50), which are laminated and thermocompression bonded to the substrate surface. is there. From the base material side, the first layer is composed of 70% by volume of epoxy resin and 30% by volume of SCN (50), the second layer is composed of 50% by volume of epoxy resin and 50% by volume of SCN (50), and the third layer is , Epoxy resin 30% by volume, SCN (50) 70% by volume. After laminating and arranging the plates that are the materials of these layers from the base material side, a groove is formed in the third layer in the mold in the same manner as in Sample No. 17, and the whole is thermocompression bonded. The thicknesses of the first layer, the second layer, and the third layer were 30 m, 30 m, and 40 m, respectively. Sample No. 19 labeled “Composite 3” has a thickness of 100 m, an open porosity of 30% by volume on the outermost surface and an open porosity of 70% by volume on the back surface, with a porosity in the thickness direction. After the SCN (50) plate material that changes continuously is thermocompression bonded to the glass fiber reinforced epoxy resin substrate, the molten epoxy resin is placed in a container with the epoxy resin placed on the top surface and heated under pressure to melt the same resin. Is impregnated in the pores of SCN (50). Concave / convex of AtlOm or less is formed on any surface of the specimen. [0038] Sample No. 20 labeled “Film” was placed on a glass fiber reinforced epoxy resin substrate surface with a SCN (50) 100 m thick plate, and hot pressed with SCN (50) The grooves described in the table were formed on the surface of the tape and simultaneously pressed. Sample No. 21 is a sheet of natural rubber having a thickness of 100 m in which grooves shown in the table have been previously formed, and is thermocompression bonded to a glass fiber reinforced epoxy resin substrate. Sample No. 22 is a layer in which γ-alumina fine particles are uniformly dispersed in SCN (50) having a three-layer structure on the surface of the above-mentioned alumina base material in the same manner as Sample No. 19. Force It is thermocompression bonded. Average secondary particle size of 1 μ ηι 70 vol% _{alumina Ύ} alumina fine particles are uniformly dispersed in, SCN (50) a first layer of 30 vol% alumina 50% by volume, SCN (50) of 50 vol% secondary Layer and alumina 30 volume%, SCN (50) 70 volume% of the third layer was prepared by thermocompression using an epoxy resin from the base material side and grooved at the same time as the third layer was pressure-bonded. It is. Sample No. 23 is a sample in which a predetermined groove is formed on the surface of the above-described alumina-based composition injection-molded. In addition, irregularities of At 10 mm or less are formed on any surface of the specimen.

[0039] Although not shown in the table, the thermal cycle durability performance with and without soft surface treatment was confirmed. Samples Nos. 17 to 20 and 22 with a surface layer formed with SCN (50) and processed with a soft surface, and a surface layer formed with only SCN (50) and processed with a soft surface! /, NA! /, 100 samples of sample number 14 were prepared for each. Place these specimens in a thermostatic layer, repeat in air — 30 minutes at 20 ° C and 30 minutes at 150 ° C. Apply 1000 cycles of thermal cycle, and then flatten the sheet surface using the same procedure as above. And the level change of residual bubbles was confirmed. As a result, in the specimens of Sample Nos. 17 to 20 and 22, which were subjected to soft surface treatment, no increase in residual bubbles with no change in flatness was confirmed in all 100 specimens. On the other hand, specimen No. 14 with no soft surface treatment showed no change in flatness, but an increase in the amount of one of 100 bubbles was confirmed.

[0040] From the above results, the following can be understood. (1) The effect of defoaming due to the presence or absence of the groove, its form, and the hardness of the surface from which the groove was cut was confirmed mainly for the 4,000 sheets or more after the start of pasting. Bubbles were observed in the 10 specimens, which were the most in sample number 1 without grooves, and in up to 5 specimens in sample numbers 2 and 3, where the depth force of the groove was ¾0 m or less. The groove is pressed in a grid pattern Sample No. 9 with grooves also in the direction perpendicular to the direction, and Sample Nos. 11 and 23 with grooves cut directly on the hard surface GREP or alumina ceramic substrate, bubbles were confirmed on the two specimens It was done. Therefore, even if there is a soft surface layer, defoaming becomes difficult when the number of sheets to be attached increases on the substrate surface without grooves. Even if there is a groove, if the depth is made smaller than the width, defoaming becomes difficult. Further, the surface hardness of the substrate surface to be attached is preferably less than 70. In addition, it is easier to defoam rather than form a soft surface layer on the hard substrate surface and form a groove on the surface. (2) By performing soft surface processing of the laminated structure consisting of composite components from the base material side to the surface of the grooved layer, the airtight reliability when the joint is subjected to a thermal cycle load increases, and air bubbles are increased. No new embrace.

Industrial applicability

The sheet pasting apparatus of the present invention is such that even if there is a local convex portion on the sheet pasting surface that affects the flatness after pasting, the surface on the opposite side corresponding to the convex portion. However, it can be applied to a flat substrate surface with high adhesiveness while remaining almost flat, and a functional part such as thick film printing of an electric circuit can be easily formed thereon. In addition, since there are almost no defects such as bubbles or wrinkles at the pasting interface, it is possible to provide a covering member with excellent translucency for decorative products by using a transparent sheet. Of course, it can be used even when both the sheet and the substrate are flat, so the object to be attached can be greatly expanded.

Claims

The scope of the claims

[1] A nearly flat sheet with a convex part having a height of 5 to 30% of its thickness is attached to the surface of the shell-dividing surface while applying pressure to the surface of the flat substrate through the adhesive layer. An affixing device, a surface hardness force S based on JIS K6253 of the pressurizing part, less than 50, and affixed with an elastic layer having a thickness of 100 to 500 times the height of the convex part Attachment device.

[2] The affixing device according to [1], wherein a groove connected to the outer periphery is formed on the surface of the substrate to be affixed!

[3] The pasting device according to claim 2, wherein the pasting surface of the base material is formed of a soft material.

[4] The affixing device according to any one of [1] to [3], wherein the pressing unit is a roller pressing method, and a contact linear pressure with the sheet is 2 kg / cm or less.

[5] The affixing device according to any one of [1] to [4], wherein the elastic body includes a laminar force silicone rubber.