JP2740573B2 - Lamination. Forming method and products therefrom - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to an improved laminate, a method for forming the same, and a metal core as a product therefrom. In particular, the present invention provides a liquid adhesive and a sealant to the opposing surfaces of the sheet, from between the opposing surfaces of the sheet,
Apply sufficient pressure to the sheet to expel air and eliminate excess liquid adhesive, to prevent air re-entry and to prevent liquid adhesive from leaching along the longitudinal edges of the sheet. The present invention relates to the spread of a sealant.

BACKGROUND OF THE INVENTION There are several applications, such as power transformers, motors, and electronic catalytic reaction converters using thin gauge sheets. Thin gauge electrical steel sheets or amorphous metal sheets in electrical applications reduce eddy currents induced by reducing the cross-sectional area through which the current flows. The grain oriented steel sheet is 0.
It has a thickness of 5 mm or less, typically in the range of 0.18 mm to 0.35 mm. Amorphous metal sheet is generally about 0.02mm
It has a thickness of ~ 0.05mm.

The above-described electrical devices are known to be more effective when the thickness of the sheet is reduced to a minimum limit on the sheet thickness dictated by manufacturing conditions. However, the reduction in sheet thickness adversely affects handling and manufacturing productivity. The handling of tissue-like thin sheets is problematic because the sheets are easily torn and easily damaged during handling. The extreme thinness of the sheet reduces processing and productivity during manufacturing and is more labor intensive to achieve that thinness.

The prior art discloses adhesives, varnishes, oxides and mixtures applied to the surface of the sheets, joining (or laminating) them together for simultaneous processing of several sheets. Processing such as lamination greatly increases productivity and reduces handling problems, as thicker laminations are more robust than single sheets.

Nevertheless, Japanese Unexamined Patent Publication No.
As fully discussed in 281814, there are many disadvantages when using adhesives, varnishes and oxides to bond the sheets.

For example, to develop good adhesion between sheets,
It is necessary to apply a relatively thick layer of adhesive that creates spacing between adjacent sheets. This is disadvantageous for bonded laminations used for rolled or laminated electrical applications, as increasing spacing between sheets reduces spacing factors. Even thinly applied adhesives are inconvenient because they shrink when cured. Such shrinkage
Particularly in a thin metal sheet, the sheet is strained to cause distortion. Another disadvantage when using chemical adhesives is that high temperatures are required to cure the adhesive. Such a high temperature reduces the effect of the magnetic refining treatment of the electric steel sheet. When using a chemical adhesive, there is another disadvantage that the sheets are firmly connected. When the strongly formed electric steel layer is wound around the iron core, distortion occurs, thereby increasing the core loss of the laminate. Another disadvantage is that the adhesive layer is destroyed by chemical or ceramic adhesives. That is, cutting, punching, or forming corrugations will cause the sheet to delaminate, breaking the brittle adhesive laminate.

Japanese Patent Application Laid-Open No. 63-281814 discloses a method in which an appropriate viscous liquid is applied to opposing surfaces of a sheet, sufficient pressure is applied to the sheet to remove excess liquid, and air is blown from between the opposing surfaces of the sheet. It states that extrusion can form a laminate that clearly resists separation. The liquid remaining between the opposing surfaces forms a seal that prevents air re-entry so that the stack can resist separation during continuous processing and manufacturing. The formed laminate does not increase the gap between the sheets and does not distort the sheets. Unfortunately, any liquid remaining between the sheets will leach out between the sheets along the sheet edges. Such leaching causes a number of physical problems when punching or during continuous processing of the stack to form a deposited stack. If transformer oil is used as the bonding liquid to form the laminated electrical steel sheet, the oil stored in the punch press will cause the lamination to slip in the drive and form the transformer core from the electrical steel sheet. It is difficult to make the exact cuts required.

In addition, the leaching causes the adhesive to be transferred to the outer surface of the laminated sheets, and the laminated and cut laminated sheets are stuck alternately, and it is difficult to properly align the laminated sheets as a core. When handling or punching stacked sheets, stacking failure may occur.

Accordingly, there remains a need for an improved technique for forming a laminate using a liquid adhesive in which leaching of the liquid adhesive from between opposing surfaces of the formed laminate is minimized or prevented.

SUMMARY OF THE INVENTION The present invention relates to an improved laminate, a method of forming the laminate, and a laminated core made from the laminate. A liquid adhesive made of oil and a sealant made of wax are applied to at least one facing surface of the plurality of sheets. Pressure is exerted on the sheet to remove excess liquid adhesive from between the opposing sides of the sheet, whereby the air between the two sides is displaced by the liquid adhesive, creating a continuous barrier along each longitudinal edge of the laminate. The sealant is spread to form, preventing air re-entry and minimizing leaching of liquid adhesive from the longitudinal edges.

A main object of the present invention is to form a laminate using a liquid adhesive, which resists separation, does not reduce the spacing factor, and can be manufactured without peeling of the laminate.

A feature of the present invention is that a laminate is formed from two or more sheets using a liquid adhesive made of oil and a sealant made of wax.

Another feature of the invention is a sealant along a longitudinal edge of at least one opposing face of a plurality of sheets to form a continuous barrier that prevents leaching of liquid adhesive from the longitudinal edges of the formed laminate. And forming a laminate using a liquid adhesive.

Another feature of the invention is to apply a sealant along the longitudinal edge and at a location intermediate the longitudinal edge relative to at least one opposing surface of the plurality of sheets, forming a continuous barrier at an intermediate location along the longitudinal edge, The purpose of the present invention is to form a laminate with a liquid adhesive that divides the laminate along the intermediate position into narrow laminates, thereby preventing the liquid adhesive from seeping out of the edges where the sealant was formed.

Another feature of the present invention is that, in order to prevent leaching of the liquid adhesive from the vertical edges of the formed laminate, the lamination is performed using a liquid adhesive composed of a low-viscosity oil and a sealant composed of a high-viscosity wax. Is to form

Another feature of the present invention is to form a laminate using a liquid adhesive having a viscosity of about 80 cP or less at 24 ° C. and a sealant having a viscosity of about 2500 cP or less at 24 ° C.

Yet another feature of the present invention is to provide at least two sheets, each having an opposing surface, applying a liquid adhesive to one of the opposing surfaces of the sheet, and applying a sealant along one longitudinal edge of the opposing surface. Applying and exerting pressure on the sheet to form a continuous barrier by removing excess liquid adhesive from between the surfaces and spreading the sealant between the surfaces when the surfaces contact each other, thereby forming a continuous barrier. The method is for forming a laminate in which the air during that time is rejected by the liquid adhesive and the sealant prevents air re-entry to minimize leaching of the liquid adhesive from the edges of the formed laminate.

Yet another advantage of the present invention is that a plurality of grain oriented steel sheets each having opposing surfaces and having a thickness of about 0.5 mm or less are supplied along a supply passage at a predetermined rate to provide one of the opposing surfaces. A liquid adhesive made of oil having a viscosity of about 80 cP or less at 24 ° C. is applied, and a sealing agent made of a wax having a viscosity of 2500 cP or less at 24 ° C. is applied along one vertical edge of the facing surface, The sheet is passed between a pair of rollers, and pressure is applied to the sheet by the roller to remove excess liquid adhesive from between the surfaces, and when the opposing surfaces come into contact with each other, a continuous barrier by a sealant is formed between the opposing surfaces. Forming, whereby air between the surfaces is rejected by the liquid adhesive, and the sealant prevents re-entry of air, minimizing bleeding of the liquid adhesive from the longitudinal edges of the formed laminate. Form a laminate from It is to be.

The advantages of the present invention are that there is little leaching of the liquid adhesive, slits can be formed, the production cost of the laminate that can be cut or punched is reduced, and the core is manufactured by using a laminate of sheets without any distortion or stress. What you can do.

The above and other objects, features and advantages of the present invention will become apparent from a consideration of the following detailed description taken in conjunction with the accompanying drawings.

[Embodiment] Referring to FIG. 1, reference numeral 12 denotes a sheet that is unwound from a coil 10, supplied at a predetermined speed along a supply passage 13, and passes over a wax applicator 17. Another sheet
16 is supplied under the oil roller 18 from the coil 14 at the same speed. The sheet 16 is turned by the direction changing roller 20 into the sheet 12.
Will be with you.

It will be understood that, in the context of the present invention, a sheet is meant to include continuous strips, foils, ribbons, or the like, as well as strips cut into individual lengths. Preferably, the sheet comprises a cold-thickened metal or cast steel and an Amorphous metal having a thickness of about 0.5 mm or less. A more preferred sheet is a grain oriented steel having a total thickness of about 0.35 mm for the sheet and the coating layer, with a glass insulating coating on both sides of the sheet. Evans U.S. Patent No. 3,948,786 referred to in thisゝdescribes particles oriented steel having Mg-PO ₄ glass insulating coating.

The wax applicator 17 can be a conventional machine such as a sprayer, a capillary applicator, a wiping roller, an extruder, and the like. For example, the wax applicator 17 has a heater 19, a supply pipe 21, and a plurality of nozzles 23 that apply a sealant 34 along the vertical edge of the surface of the sheet 12 facing the same. Oil roller 18 applies a thin coating of liquid adhesive to the opposing surface of sheet 16. Sheet 12 and Sheet 16
Passes between a pair of sealing or pressing rollers 22, 24 that apply sufficient pressure to the sheets 12, 16,
Adjacent facing surfaces of the sheets 12, 16 are adhered to each other. A continuous thin film of liquid adhesive and sealant excludes all air between the opposing surfaces of the sheet to form the laminate 26.
Laminate 26 is wound around mandrel 28 forming iron core 30.

The spacing between the rollers 22,24 is not less than the combined thickness of the sheets 12,16. In the particle-oriented sheet, a sufficient pressure is applied by the rollers 22 and 24 to remove the excess liquid adhesive, and at the same time, remove air to spread out the sealant and induce stress in the sheets 12 and 16. A continuous barrier or seal is formed along both longitudinal edges of the formed stack without.

FIG. 1 shows that a sealant made of wax is applied by a wax applicator 17 to the lower facing surface of the sheet 12,
The liquid adhesive of oil is shown to be applied by roller 18 to the opposing surface on sheet 16. Also,
The wax applicator 17 is used to apply a sealant to the opposing surface of the sheet 16 and the roller 18
Used to apply liquid adhesive to the opposing surface underneath. Also, the adhesive and the sealant can be applied to both opposing surfaces of the sheets 12,16. When laminating sheets, as long as a continuous barrier is formed along the vertical edge, the sealant is a continuous line, parallel line, square, oblique parallel stripe pattern, sinusoidal line, extruded bead or equivalent It will be appreciated that a number of shapes such as can be applied to the opposing surfaces of the sheet. The liquid adhesive can be applied by coating with a roller or spraying as a fine mist. Based on the available equipment, a number of sheets are preferably fed simultaneously along the feed path 13 to apply liquid adhesive and sealant to the sheets during the previous processing steps depending on the type of material to be laminated. I can do it. In each case, the liquid adhesive and sealant are applied only to the opposing sheet surfaces when the sheets are combined into one laminate.

FIG. 2 shows that sheets 12, 16 are layered by rollers 22, 24.
2 shows a cross section of the sheets 12, 16 along line 2-2 of FIG. 1 before being combined. A small bead of sealant 34 is positioned along each longitudinal edge 36, 38 of the facing surface 32 of sheet 12. A thin film of liquid adhesive 42 is located on the facing surface 40 of the sheet 16. If layer 26 is slit to a narrow width, additional sealant is provided longitudinally along opposing surfaces 32 at the location where the layer is slit. In an electrical steel layer that has been slit and tailored for iron core punching at a 45 ° angle, additional sealant applied to suitably subdivided locations is provided along the longitudinal and lateral edges of the slit and cutting layers. It has a square, oblique parallel striped or sinusoid-like pattern to ensure a continuously extending sealant.

FIG. 3 shows an enlarged schematic cross-sectional view of a portion of the laminate 26 formed from the sheets 12, 16 shown in FIG. The plane of the metal sheet is generally not perfectly flat, but rather rough. The facing surface 32 of the sheet 12 does not continuously contact the adjacent facing surface 40 of the sheet 16. Opposing surfaces 32, 40 engage one another at contact point 44. Sheet 12,
When 16 are brought into contact with each other by rollers 22, 24,
A void portion 46 indicating a non-contact point between 2 and 40 is filled with the liquid adhesive 42. Sealant 34 is spread along the longitudinal edges of layer 26 to form a thin continuous barrier or dam. FIG. 3 shows a thin barrier 34a formed by rollers 22, 24 with a sealant 34 extending along a longitudinal edge 38. The separation or void 46 between the surfaces 32, 40 at the point of non-contact is less than about 0.005 mm. Air is removed when excess liquid adhesive is squeezed out between surfaces 32,40. Sheets 32, 40 on sheets 12, 16
A continuous thin film of sealant 34a formed along the longitudinal edges 36,38 between prevents air re-entry and leaches the liquid adhesive 42 from between the facing surfaces 32,40 along the longitudinal edges of the laminate 26. To block. Therefore, the sheets 12, 16 are held firmly together.

If there is no barrier 34a along the vertical edge, the liquid adhesive 42
Can be leached from between the opposing surfaces of the sheet as indicated by the permeation 42a.

FIG. 2 shows a sealant bead 34 provided along the longitudinal edges 36, 38 of the sheets 12,16. If the laminate 26 shown in FIG. 3 is longitudinally subdivided into two or more narrow layers, the liquid adhesive 42 will face 32 along the newly cut longitudinal edges of the narrow laminate. Leaches from between, 40. In this situation, it is desirable to apply additional sealant to correspondingly facing surfaces of the subdivided sheet so that there is a continuous barrier 34a along the longitudinal edges on each side of each stack. In one layer, subdivided into two equal width layers, a sealant 34 is applied to the opposing surfaces approximately halfway between the edges 36,38.

Atmospherically filled voids surrounding the liquid adhesive or sealant and the laminate 26, without being distinguished by theory
It can be seen that the pressure differences existing between 46 hold the stacks firmly together. In other words, sheets 12, 16
Resists delamination because the internal pressure of the stack during separation is reduced below the atmospheric pressure that presses against the outer surface of the stack 26, as indicated by arrow 48 in FIG. Sheet 12,
Sealing agent 34 and liquid adhesive 42 between 16 facing surfaces 32 and 40
Each containing a thin layer of Sheets 12 and 16 are rollers 22,
Supplied from left to right through 24 engagements. Rollers 22, 24
When the surfaces 32 and 40 are brought into close contact with each other, a concave / convex lens 50 is formed to exchange air with the sealant 34, and excess liquid adhesive 42 is discharged from between the facing surfaces 32 and 40.

The liquid adhesive is approximately 80 cP at 24 ° C when applied to the sheet
It can be a low-viscosity liquid suitably having a viscosity not larger than that. When a high-viscosity adhesive is used, it is difficult to obtain a good spacing factor, and it is difficult to prevent the movement of the stacked sheets. Acceptable adhesives include water, alcohol, oil and equivalent. For highly viscous adhesives, it is preferred to heat the adhesive above ambient temperature to apply it to the sheet. For cutting electrical steel sheets, the adhesive is formed into a continuous film to provide continuous internal insulation to maintain magnetic properties. Natural or synthetic transformer oils are suitable for this. Importantly, the adhesive that properly wets the surface of the sheet has the required viscosity that is compatible with the environment in which the lamination is used.

In the sealant, a relatively high-viscosity liquid or solid such as wax having a high viscosity at 24 ° C. rather than about 250 cP can be used. Waxes having a viscosity greater than about 2500 cP at 24 ° C. are difficult to extrude. The additional force required to extrude the thick resinous wax can worsen iron loss in electrical steel and cause microplastic strain in the sheet. A sealant that solidifies at ambient temperature, such as a hard beeswax, causes residual strain in the iron core and places the electrical steel in a stressed state.

As in the case of the liquid adhesive, it is preferable to heat the highly viscous sealant to a temperature not lower than the ambient temperature when applied to the sheet. What is important in the sealant is the same as in the liquid adhesive, with the additional viscosity being sufficient to delay or prevent leaching of the liquid adhesive by a continuous barrier formed along the longitudinal edges of the laminate. is there.

Viscosity is a measure of the resistance of a liquid to flow based on the attraction between molecules. If the intermolecular attraction is large, the liquid will flow more slowly. The viscosity of the liquid adhesive and the sealant used are determined by the rollers 22, 24 as shown in FIG.
Between the facing surfaces 32, 40 when they touch each other
It is important to influence the flow rate of the meniscus 50 between 32 and 40.

As described in JP-A-63-281814, it is empirically determined that various low-viscosity liquids are good as adhesives. The core used as a transformer for power conversion is
Often it is permanently immersed in the transformer oil and cooled by the transformer oil. The use of this oil as an adhesive is a special advantage that is compatible with transformer oil. In some applications, the formed core may be subjected to a final heat treatment before becoming a final product. In heat treated iron cores where the carbon in the hydrocarbon-based liquid adhesive can contaminate the sheet metal, ie, grain oriented steel, synthetic non-carbon oils can be used as the adhesive.

Example 1 As an example, a regular grain oriented electrical steel, 7.65 cm wide, 30.5 cm long and 0.18 mm thick is applied on a mill glass coating.
It covered with an insulating coating of ~6gm / m ^2. In tests 1 to 3, only the liquid adhesive was applied to the sheet. A silicone-type transformer oil of nominal viscosity of 40 cP at 24 ° C. was applied by brush to one opposing face of each set of steel sheets. The two sheets were stacked through the sheet via a pair of 76 mm diameter neoprene rollers, with sufficient pressure applied to remove excess transformer oil and the air evacuated between the opposing faces. In tests 4 to 6, only the sealant was used. 24 ℃
Organic wax with a viscosity of 500cP along the length (winding direction) of the sheet as a series of parallel lines
And a spacing of about 25 mm on a pair of opposing sheet surfaces with a contact wiper. By applying sufficient pressure to the outer surface of the sheet, the wax sealant was spread in a thin film on the opposite surface of the sheet. After lamination and after undergoing metal cutting, all tests were immediately considered. Tests 1 to 3 are based on laminates with good properties,
The grain-oriented electrical steel maintained the essential magnetic properties.
The average iron losses at 15kG and 17kG were increased by 0.8% and 0.9%, respectively. However, leaching of transformer oil from between the sheets along the edges is evident during solidification of the sheets and during cutting of the laminate. As expected in tests 4-6, no leaching occurs because only the high viscosity sealant is used. However, the laminates produced had inferior properties which when cut resulted in a considerable deterioration in magnetic properties. Average iron losses at 15kG and 17kG were increased by 5.1% and 5.2%, respectively. Tests 4-6 show that the use of a sealant without a liquid adhesive to form a continuous film between the opposing faces of the sheet does not prevent the magnetic properties from deteriorating. Metal-to-metal contact, or inner layer "shorting", occurs when continuous inner layer insulation is poor, resulting in a circulating or overcurrent during AC magnetization. This shorting is due to the loss of insulation coating from the sheet surface if the lamination formed during the construction of the iron core is cut. When a continuous thin film of liquid adhesive is provided, even if the insulating coating peels off when cutting the metal sheet,
The adhesive clearly retains the powdered insulating coating that keeps the sheets in contact with each other at the cutting point.

Example 2 A highly permeable oriented electrical steel sheet 7.65 cm wide, 30.5 cm long and 0.23 mm thick is applied to a milled glass coating of 9-10 gm.
/ m ² coated with an insulating coating. In tests 7-10, the same liquid adhesive was applied in a similar manner as in tests 1-3 above. The same method of application as in Tests 4-6, except that the sealant was applied to a series of parallel bands, each having a band of about 10 mm and bands spaced about 30 mm apart. Used in tests 11-14. All tests were evaluated immediately after lamination and after undergoing metal cutting. The results of the laminates made in tests 7-14 are in test 1
6 is substantially the same as reported above. The magnetic properties of the laminates made in tests 7-10 using only liquid adhesive are good, but the leaching of the adhesive occurs during solidification of the sheet and after cutting the laminate. The average iron losses at 15kG and 17kG increased by -0.3% and 0.8%, respectively. Laminates made in tests 11-14 have inferior properties, with average iron losses at 15 kG and 17 kG of 2.4 respectively.
% Was increased by 4.3%.

Example 3 An additional laminate was prepared according to the invention from the same sheet as in Example 2. The same adhesive and application method were applied to the sheets in Tests 15 to 17 as described in Tests 1 to 3 in Example 1. After applying the liquid adhesive to the sheet, the sealant described in Tests 4-6 of Example 1 was applied in Tests 15-17 in the form of 10 mm wide beads along the length and width of the sheet. . Example 1 sheet
Were solidified into a laminate in the same manner as described in Tests 4 to 6 above. No leaching of the adhesive along any edge of the laminate occurred after solidification of the sheet or after cutting the laminate.
The magnetic properties of the laminate were excellent before and after cutting. 15kG and 17kG
The average core loss is well within the test results described above when only liquid adhesive is used in Tests 1-3 of Example 1 or Tests 7-10 of Example 2. Upon solidification of the sheet, it was shown that the sealant was spread into a thin continuous film along the edge of the formed laminate that held the liquid adhesive between the opposing faces of the sheet forming the laminate.

The results of the tests described above are summarized in Table 1. Table 1 Test number Lamination properties after cutting Leaching after cutting 1 Good Yes 2 Good Yes 3 Good Yes 4 Poor No 5 Poor No 6 Poor No 7 Good Yes 8 Good Yes 9 Good Yes 10 Good Yes 11 Poor No 12 Poor No 13 Poor 14 Poor 15 (Invention) Good No 16 (Invention) Good No 17 (Invention) Good No Although only certain embodiments of the invention have been described, various changes may be made without departing from the spirit and scope of the invention. It will be appreciated that this can be done. For example, various adhesives and sealants can be used as long as they are compatible with the situation, and when formed into a very thin layer, those having the necessary viscosity to form a seal can be used. Two or more sheets can be laminated simultaneously using various means, such as applying a liquid adhesive and a sealant to opposing surfaces of at least one sheet. A coating such as a metal or glass insulation coating can be applied first to one or both sides of the sheet. The laminate is wound as an iron core, cut or otherwise deposited and formed into an iron core.

Accordingly, the limitations of the present invention should be determined from the appended claims.

[Brief description of the drawings]

FIG. 1 is a schematic view in which two sheets move along a supply path where the sheets are stacked on each other by a pair of sealing rollers, and the stack is wound around an iron core. FIG. 2 is a line 2-2 in FIG. FIG. 3 is an enlarged schematic sectional view of the laminated sheet of the present invention, and FIG. 4 is an enlarged vertical sectional view of two sheets pressed together according to the present invention. In the figure, 10, 14: coil, 12, 16: sheet, 13: supply passage, 2
2, 24: Roller, 26: Laminated, 32, 40: Surface, 36, 38: Vertical edge, 34:
Sealant, 42: adhesive, 34a: barrier.

Claims (21)

(57) [Claims] 1. A sealant comprising at least two sheets having opposing surfaces, a liquid adhesive made of oil applied to one of these opposing surfaces, and a wax made of wax along one longitudinal edge on one of the surfaces. And apply pressure to the sheet to remove excess liquid adhesive from between the two sides, causing a continuous barrier to form along the longitudinal edges when the two sides come into contact with each other, thus providing a Wherein the air is driven off by the liquid adhesive and the continuous barrier formed by the sealant prevents air re-entry and minimizes leaching of the liquid adhesive from the longitudinal edges. 2. The method of claim 2 wherein each sheet is a grain oriented steel thinner than about 0.5 mm and the sheet surface is coated with an oil or wax impermeable glass insulating film. 3. The gap between surfaces after pressure is applied is approximately
2. The method according to claim 1, wherein the thickness is smaller than 0.005 mm. 4. The method according to claim 1, further comprising the step of passing one of the sheets through the supply passage at a predetermined speed and passing another sheet through the supply passage at the same speed. 5. The method according to claim 4, wherein the pressure is applied by passing the sheet between a pair of spaced rollers, wherein the gap between the rollers is greater than the combined thickness of the sheets. 6. A sealant is applied to one sheet surface,
6. The method of claim 5, wherein the liquid adhesive is applied to the surface of the other sheet as the sheet passes through the supply passage. 7. A method according to claim 2, wherein each sheet has a thickness of about 0.5 mm or less and includes the step of winding the laminate as an iron core of an electrical transformer. 8. The method according to claim 2, wherein each sheet has a thickness of about 0.5 mm or less, and has a step of cutting without separating the laminates, and stacking the plurality of cut laminates as an iron core of an electric transformer. Lamination forming method. 9. The method according to claim 1, wherein the liquid adhesive has a viscosity of about 80 cP or less at 24 ° C., and the sealant has a viscosity of about 2500 cP or less at 24 ° C. 10. The method according to claim 1, wherein the temperature of the liquid adhesive and the sealant is higher than the ambient temperature when the liquid adhesive and the sealant are applied to the surface of the sheet. 11. A member of the group consisting of continuous lines, parallel lines, intersecting shading lines, sinusoidal lines, squares, and extruded beads.
The method according to claim 1, wherein the sealant is applied in two patterns. 12. At least two each having opposing surfaces
One sheet is prepared, a liquid adhesive made of oil is applied to one of these facing surfaces, and a sealing agent made of wax is applied to one of both surfaces along a vertical edge and at a position intermediate the vertical edge, Pressure is applied to the sheet to remove excess liquid adhesive from between the surfaces, and form a continuous barrier along the longitudinal edge and at an intermediate position when the two surfaces contact each other, along the intermediate position. Slitting the laminate and forming a continuous barrier between the sheets of the laminate along the slit edges, thus the air between both sides is displaced by the liquid adhesive,
A method of forming a laminate wherein the continuous barrier formed by the sealant prevents air re-entry and minimizes leaching of liquid adhesive from the longitudinal edges of the laminate. 13. Passing one of the sheets through the supply passage at a predetermined speed, and passing another sheet through the supply passage at the same speed.
A liquid adhesive having a viscosity of about 80 cP or less is applied to one of the opposing surfaces, and a sealing agent having a viscosity of 2500 cP or less at 24 ° C. is applied along one vertical edge of the surface, and these sheets are paired. And applying pressure to the sheet by the rollers to remove excess liquid adhesive from between the surfaces and to form a continuous barrier with a sealant between the surfaces when the surfaces contact each other. And thus,
The air between the two sides is expelled by the liquid adhesive and has opposing surfaces where the continuous barrier formed by the sealant prevents air re-entry and minimizes liquid adhesive leaching from the edges. A method of forming a laminate from a plurality of grain oriented steel sheets having a thickness of about 0.5 mm or less. 14. A liquid adhesive is applied to one of the sheets,
14. The method according to claim 13, wherein the sealant is applied to the other sheet when the sheet passes along the supply path. 15. A low-viscosity liquid between at least two sheets each having opposing surfaces, said surfaces contacting each other, a high-viscosity sealant along a longitudinal edge of said surface and a sealant on said surface. Consisting of an adhesive and air between the two sides that is displaced by the liquid adhesive and the sealant, the sealant forms a continuous barrier to prevent air re-entry and minimize leaching of the liquid adhesive from the edges. This allows the stack to be handled without separating the stack. 16. The laminate according to claim 15, wherein the low-viscosity liquid adhesive is oil and the high-viscosity sealant is wax. 17. The method of claim 15 wherein the surface has a glass insulating coating impermeable to liquid adhesive and sealant, and each sheet is a grain oriented steel having a thickness of about 0.5 mm or less. Lamination. 18. The laminate according to claim 15, wherein the liquid adhesive has a viscosity at 24 ° C. of about 80 cP or less, and the sealant has a viscosity at 24 ° C. of 2500 cP or less. 19. At least one laminate of at least two sheets, each having opposing surfaces, having a thickness of about 0.5 mm and contacting each other on both sides, and a sealant along a longitudinal edge of said surfaces. The liquid adhesive between the sealant on the surface and the air between the two surfaces that is displaced by the liquid adhesive and the sealant, the sealant forming a continuous barrier to prevent re-entry of air and a vertical edge A metal core that minimizes the leaching of liquid adhesive out of the stack, thereby allowing the stack to be handled without separation. 20. The metal core according to claim 19, wherein the core is a winding transformer. 21. The metal core according to claim 19, wherein the liquid adhesive has a viscosity at 24 ° C. of about 80 cP or less, and the sealant has a viscosity at 24 ° C. of 2500 cP or less.