JP6621590B2 - Laminate sheet - Google Patents

Description

  The present invention relates to a laminate sheet, and more particularly to a laminate sheet obtained by laminating an aluminum foil and a paper material.

  2. Description of the Related Art Conventionally, in order to prevent contamination of a kitchen gas range, a gas range top plate cover that covers the top plate surface of the gas range and prevents adhesion of oil stains and the like during cooking has been used. In general, such a gas range top plate cover is formed by laminating a metal foil such as an aluminum foil on both sides of a non-combustible paper and having an opening formed at a location corresponding to the position of the gas burner. Yes.

  FIG. 12 is a schematic plan view showing a schematic configuration of such a conventional laminate sheet disclosed in Patent Document 1. As shown in FIG.

  Referring to the drawing, sheet 51 is laid so as to cover the surface of the top plate of the gas range, and prevents oil stains and the like during cooking in the kitchen from adhering. In order to replace the sheet 51 when it becomes dirty, the sheet 51 is attached and detached while holding the sheet end portion 52 in a straight line.

  Next, the structure of the laminate sheet will be described.

  13 is an enlarged cross-sectional view taken along line XII-XII shown in FIG.

  Referring to the drawing, a sheet 51 has a laminated structure in which a first aluminum foil 54 and a second aluminum foil 56 are bonded to both surfaces of a paper 55 that is a non-combustible paper or a flame retardant paper.

JP 2000-257879 A

  Since the conventional laminate sheet as described above is composed of a laminate of aluminum foil and paper material, the thickness is very thin, and the end of the sheet is linear, so the laminate sheet When laying on the top plate of the gas range, there is a risk that the finger may be cut when the end is touched with the finger.

  Further, in order to avoid this problem, an attempt to edge-wrap the end portion of the laminate sheet was not easy due to its structure.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a laminate sheet in which a finger is hardly cut at the end.

In order to achieve the above object, the invention described in claim 1 is a laminate sheet composed of a sheet made of a sheet-like paper material and an aluminum foil attached to both surfaces thereof, peripheral portion of the sheet edge will have a concavo-convex shape in a plan view, the laminate sheet is a gas range top plate covering the peripheral portion has a corrugated shape which peaks and valleys are repeated in a plan view, convex irregularities When the length along the edge of the portion is L ₁ [mm], the repetition pitch of the corrugated shape is L [mm], and the maximum displacement of the corrugated shape is H [mm]
^{_{L 1 = {H 2 + (}} L 2/4)} 1/2
Is formed .

If comprised in this way, a contact surface with a finger | toe will become discontinuous, and when a sheet | seat end surface moves in parallel, a contact area and a non-contact area will exist alternately. Further, if L ₁ is determined, H and L can be specifically determined.

According to a second aspect of the invention, in the structure of the invention of claim 1, wherein, when the linear length of the discontinuity of the convex portion due to the presence of the recessed portion of that irregularities and L _{2 [mm],
L 2>} L 1/5
Is formed.

  If comprised in this way, even if there exists a continuous contact opportunity to a some convex part, a tensile force does not exceed a counter force.

According to a third aspect of the present invention, in the configuration of the first aspect of the invention, the pitch L is set to 1 to 10 mm, and the maximum displacement H is set to 0.2 to 5.0 mm.
The invention according to claim 4 is the constitution of the invention according to any one of claims 1 to 3 , wherein the total thickness T of the sheet is 0.086 to 0.445 mm ,
L ₁ <22.5 · T
Is formed.
If comprised in this way, the tension | tensile_strength will not exceed a counterforce at least in the contact opportunity with the first finger | toe.

As described above, according to the first aspect of the present invention, the contact surface with the finger becomes discontinuous, and when the sheet end surface moves in parallel, the contact section and the non-contact section exist alternately. Hard to cut. Further, if L ₁ is determined, H and L can be specifically determined. Therefore, if the material and configuration of the laminate sheet are determined, it is possible to design the shape of the sheet end that is difficult to cut fingers. it can.

  In addition to the effect of the invention described in claim 1, the invention described in claim 2 is extremely incised because the tensile force does not exceed the opposing force even if there is a continuous contact opportunity to a plurality of convex portions. Hateful.

According to a third aspect of the invention, in addition to the effect of the first aspect, it is possible to more efficient design.
In addition to the effects of the invention according to any one of claims 1 to 3 , the invention described in claim 4 is incised because the tensile force does not exceed the opposing force at least at the first contact opportunity with the finger. Hard to do.

It is a schematic plan view which shows schematic structure of the laminated body sheet | seat by 1st Embodiment of this invention. It is an expanded sectional view of the II-II line shown in FIG. FIG. 2 is a schematic cross-sectional view showing a state of a finger when the sheet end is in contact with the finger in FIG. 1, where (1) shows a state before the sheet moves, and (2) shows a sheet. Shows the state after moving a certain distance. FIG. 2 is a schematic cross-sectional view showing a contact surface between a sheet end surface and a finger in FIG. 1, wherein (1) shows a finger-side contact surface, and (2) shows a sheet-side contact surface. FIG. 2 is an enlarged schematic view showing a sheet end portion of an “X” portion shown in FIG. 1, (1) is a plan view of the sheet end portion, and (2) is an extension line of the sheet main body plane. Viewed from the top. It is a graph which shows a mode that tension | tensile_strength increases with the increase in a total contact distance in FIG. It is a schematic plan view which shows schematic structure of the laminated sheet by 2nd Embodiment of this invention, and respond | corresponds to FIG. FIG. 8 is an enlarged schematic view showing the sheet end portion of the “Y” portion shown in FIG. 7 and corresponds to FIG. FIG. 9 is an enlarged schematic view showing a sheet end portion of a laminate sheet corresponding to FIG. 8, wherein (1) shows the repetition pitch and maximum displacement, and (2) shows the lowest point adjacent from the highest point. (3) shows the straight line length from the uppermost point to the adjacent lowermost point. It is a schematic process drawing which shows the manufacturing process of the laminated body sheet by 2nd Embodiment of this invention. It is an expansion schematic showing the shape of the sheet edge part of the layered product sheet by other embodiments of this invention, and corresponds to Drawing 1 (1). It is a schematic plan view which shows schematic structure of the conventional laminated body sheet. It is an expanded sectional view of the XII-XII line shown in FIG.

  FIG. 1 is a schematic plan view showing a schematic configuration of a laminate sheet according to the first embodiment of the present invention.

  Referring to the drawing, sheet 1 is a gas range top plate cover, and is molded into a shape such that the main body plane can cover the top plate surface of a gas range (not shown). Moreover, the sheet | seat edge part 2 becomes uneven | corrugated shape in planar view.

  Next, the cross-sectional structure of the laminate sheet according to the first embodiment of the present invention will be described.

  FIG. 2 is an enlarged sectional view taken along line II-II shown in FIG.

  Referring to the drawing, the sheet 1 has a cross section in which a first aluminum foil 4 on the upper surface side and a second aluminum foil 6 on the lower surface side are attached to both surfaces of a paper 5 that is noncombustible paper.

  The thicknesses of the first aluminum foil 4 and the second aluminum foil 6 are selected from 0.006 to 0.050 mm, respectively, and the thickness of the paper 5 is selected from 0.080 to 0.345 mm. Therefore, when the thickness of the laminate sheet is set to T [mm], the upper limit of T is 0.445 mm, which is the configuration when each of the first aluminum foil, paper, and second aluminum foil is the thickest. In addition, the lower limit of T is 0.086 mm because a laminate sheet having a configuration without the second aluminum foil is also assumed. From the above, the range of the thickness T of the laminate sheet is 0.086 to 0.445 mm.

  In addition, from a design viewpoint, the upper surface of the first aluminum foil 4 may be printed.

  As shown below, the end portion of the laminate sheet according to this embodiment has a concavo-convex shape so that even if the sheet end portion and the finger come into contact with each other, it is difficult to cut the finger.

  Therefore, the reason why it is difficult to cut the finger even if the uneven sheet end and the finger come into contact with each other will be described.

  First, when a sheet-like object comes into contact with a finger and the sheet end surface is pushed into the finger with a constant force and moved so as to slide parallel to the contact surface at a constant speed, the finger side has a certain area. The paper side contacts with a total area that increases in proportion to the contact distance. When the accumulated frictional force (tensile force) generated by the frictional force and gradually accumulates exceeds the opposing force of the finger contact surface, it is considered that the finger is cut. At that time, the following equation is considered to hold.

F = μ · N · A> C (i)
F is the accumulated frictional force [N (Newton)]. In this case, “tensile force”.

  μ is a coefficient of friction. In this case, the relationship between the sheet end face and the finger is always constant.

N is a pressing force [N / mm ² ]. In this case, it is the pressing force per unit area that the sheet end face applies in the direction perpendicular to the finger.

A is the total contact area [mm ² ]. In this case, the total area of the contact between the sheet end surface and the finger in the contact between the sheet end surface and the finger.

  C is the counter force [N]. In this case, it is defined as the “counterforce” of the finger contact surface.

  Since μ is constant, the tensile force F increases as the pressing force N or the area A increases.

  Then, at the moment when the tensile force F exceeds the counter force C, the finger is cut.

  Here, C will be described.

  3 is a schematic cross-sectional view showing the state of the finger when the sheet end and the finger are in contact with each other in FIG. 1, and (1) shows the state before the sheet moves, (2 ) Shows the state after the sheet has moved a certain distance.

  First, referring to (1), the sheet end 2 and the finger 8 are in contact with each other. When the sheet is translated in the direction of the arrow, the contact surface between the sheet end 2 and the finger 8 is frictioned to generate a force that pulls the skin of the finger and starts deformation. Since the finger has a certain elasticity, the state shown in (2) is obtained after the paper is moved.

  Next, referring to (2), the finger 8 is pulled by friction in accordance with the moving direction of the sheet end 2 to cause distortion. The finger can counteract up to a certain force by deformation, but when the limit of the counterforce (deformation limit) is exceeded, the finger is considered to be cut. The limit force that this finger can counter the tensile force is the counter force C.

  Then, it is considered that the counter force C of the finger in this case is proportional to the contact area B on the finger side.

C = β · B (ii)
β is a counter force constant [N / mm ² ]. In this case, the resistance per unit area of the finger is constant.

B is a contact area [mm ² ]. In this case, the contact area on the finger side in contact between the sheet end surface and the finger.

  That is, as the finger is greatly in contact with the end surface of the sheet, the opposing force increases and the finger is less likely to be cut.

  4 is a schematic cross-sectional view showing a contact surface between a sheet end surface and a finger in FIG. 1, wherein (1) shows a finger-side contact surface, and (2) shows a sheet-side contact surface. It is.

  First, referring to (1), the sheet end surface 3 is in contact with the finger 8 via the contact surface 9. When the sheet is translated in the direction of the arrow, the sheet moves while continuing contact with the finger 8 via the contact surface 9. The vertical width of the contact surface 9 is the sheet thickness T [mm]. The width of the contact surface 9 is W [mm], and the area of the contact surface 9 is B. From the start of contact between the sheet end surface and the finger until after the sheet is moved, the finger side always keeps contact with the sheet end surface via the contact surface 9.

  Next, referring to (2), when the sheet is translated in the direction of the arrow in (1), the contact surface 9 of the sheet end surface with the finger translates in the direction of the arrow in (2), and the distance D ′ After moving [mm], the sheet end surface and the finger are in contact with each other via the contact surface 10 drawn with a dotted line. All the contact surfaces on the sheet end surface side that have come into contact with the finger during the movement are the total contact surfaces 11. The vertical width of the total contact surface 11 is the thickness T of the sheet, and the horizontal width is a distance D that is the sum of the moving distance D ′ and the horizontal width W of the contact surface 9 before moving. The area of the total contact surface 11 is the total contact area A.

  Here, B will be described.

  B is the contact area on the finger side in the contact between the sheet end surface and the finger, and it is considered that the following equation holds.

B = T · W (iii)
T is the thickness [mm] of the sheet. In this case, it becomes the vertical width of the contact surface of the finger and the vertical width of the contact surface of the sheet end surface.

  W is the width [mm] of the contact surface. In this case, the width of the contact surface of the finger.

  When considering the contact between a certain sheet end face and a finger, since T and W are constant in the relationship, B is constant.

  Next, N will be described.

  N is a pressing force per unit area applied to the sheet end surface in a direction perpendicular to the finger, and it is considered that the following equation holds.

N = P / B (iv)
P is the pushing force [N]. In this case, it is the force that the sheet presses against the finger, and is constant.

  That is, N is larger as the contact area B is smaller.

  Next, A will be described.

  A is the total area of the contact between the sheet end surface and the finger at the sheet end surface side, and it is considered that the following equation holds.

A = TD (v)
D is the total contact distance [mm]. In this case, it is the sum of the moving distance D ′ of the sheet and the width W of the contact surface at the start of contact.

  Here, D ′ and D are expressed by the following equations.

D '= V · S
D = V · S + W (vi)
V is the speed [mm / s]. In this case, it is the speed at which the sheet moves in the direction parallel to the contact surface without moving up and down, and is constant.

  S is time [s]. In this case, it is the contact time between the sheet end face and the finger after the sheet starts moving.

  The total contact distance D increases as the sheet moving speed V increases or the contact time S between the sheet end face and the finger increases.

  When the above formulas (ii) to (vi) are inserted into the above formula (i), the following results.

F = μ · P · D / W> β · T · W = C (vii)
D = V · S + W
What can be said from this equation is as follows.

  First, as the force P that the sheet pushes into the finger increases, the tensile force F increases and the finger is more likely to be cut.

  In addition, as the total contact distance D is longer, the tensile force F is increased and the finger is likely to be cut.

  Further, as the width W of the finger contact surface is shorter, the tensile force F increases, the counter force C decreases, and the finger is easily cut.

  Furthermore, as the thickness T of the contact surface decreases, the counter force C decreases and the finger is likely to be cut.

  Since μ and β are constants and P, V, W, and T are constant in this case, the tensile force F is proportional to the total contact distance D from the above formula (vii). That is, if the contact distance between the sheet end surface and the finger is shortened, the tensile force is difficult to increase and the finger is less likely to be cut.

  Here, if the end portion of the sheet is an uneven shape in plan view, the contact distance between the sheet end surface and the finger is shortened. As a result, the tensile force F does not easily exceed the counter force C in a single contact opportunity, and the finger is less likely to be cut.

  This is illustrated in FIG. FIG. 5 is an enlarged schematic view showing the sheet end portion of the “X” portion shown in FIG. 1, wherein (1) is a plan view of the sheet end portion, and (2) is a sheet main body plane. It is seen from the upper part on the extension line.

First, referring to (1), convex portions 13 and concave portions 14 are alternately present at the sheet end 2. An intermediate line of displacement of the sheet end portion is an alternate long and short dash line 15, the upper portion is the convex portion 13 with the line 15 as a boundary, and the lower portion is the concave portion 14. L ₁ is a straight line length parallel to the line 15 of the convex part, and L ₂ is the length of the concave part.

Next, referring to (2), the portion 13 of the sheet end surface 3 is the end surface of the convex portion 13 and is a portion that can come into contact with the finger. Its longitudinal width width a thickness T of the sheet is the length L ₁ of the convex portion. Further, the portion 14 is an end face of the concave portion 14 and is a portion that cannot contact the finger.

  If the sheet end is linear as in the conventional example, the contact surface is continuous, and the sheet end surface continues to contact the finger while moving in parallel. On the other hand, if the sheet end is an uneven shape, the contact surface is discontinuous, and when the sheet end surface is translated, there are a section that contacts the finger (contact section) and a section that does not contact the finger (non-contact section). It exists alternately.

  FIG. 6 is a graph showing how the tensile force F increases as the total contact distance D increases. The horizontal axis represents the total contact distance D, and the vertical axis represents the ratio [%] of the tensile force F to the counter force C. That is, when the tensile force F exceeds the counter force C (100%), the finger is cut.

  A line 25 indicated by an alternate long and short dash line represents a counter force C (100%) and is constant regardless of the total contact distance D. A line 26 indicated by a broken line represents a case where the linear sheet end and the finger are in contact with each other as in the conventional example. In this case, the tensile force F increases as the total contact distance D increases, and when the total contact distance D exceeds a certain length, the tensile force F exceeds the counter force C and the finger is cut. The broken line 27 represents the case where the uneven sheet end and the finger are in contact with each other according to this embodiment, and the tensile force F increases in a single contact section consisting of convex portions as in the case of a straight line. The contact section ends before the tensile force F exceeds the counter force C, and then enters the non-contact section composed of the concave portion.

  That is, in the uneven sheet end according to this embodiment, since the length of the contact section is shorter than a certain length, one contact opportunity is ended before the tensile force F exceeds the counter force C, and the finger is moved. Hard to cut.

  Here, a case will be described in which the sheet continues to be translated after the end of a single contact opportunity between the sheet edge and the finger.

  When the contact opportunity once ends, the finger skin tries to quickly return from the strained state by the tensile force, and the tensile force F is reduced. Further, since the contact surface in the subsequent contact opportunity is slightly different from the previous contact surface, the tensile force F is further reduced. As a result, the tensile force F decreases rapidly in the non-contact section.

  For the above reason, it is considered that the decrease rate of the tensile force F in the non-contact zone is much faster than the increase rate of the tensile force F in the contact zone and is about 5 times.

  That is, in the uneven sheet end portion according to this embodiment, the non-contact section exists after the contact section, so that the tensile force F accumulated in the contact section rapidly decreases in the non-contact section, and the tensile force F However, it is difficult to exceed the counter force C, and it is difficult to cut the finger.

  Further, if the non-contact section existing after the contact section is sufficiently long, the tensile force F accumulated in the contact section is reduced to 0 in the non-contact section, and thereafter, the contact section having a similar ratio length and Even if non-contact sections exist alternately, it is difficult to cut a finger.

  Next, the upper limit of the length of the contact section and the lower limit of the non-contact section for preventing the finger from being cut will be described.

The length L ₁ of the convex portion of the sheet end, corresponds to the length of the contact section in a time of opportunity for contact sheet end face and the finger. Further, the length L ₂ of the recessed portion of the sheet edge ends contact opportunities that once the length of the non-contact section up to contact the next begins.

  First, when a certain sheet end face comes into contact with a finger, the sheet moves in parallel at a constant force and a constant speed, and the finger is not cut, the tensile force F <the counter force C is established in the above formula (i). .

That is, when the sheet edge is uneven, the length L _{1 of the} convex portion that can come into contact with the finger is determined by the tensile force F <counter force in the above formula (vii) in order to prevent the finger from being cut at a single contact opportunity. It is necessary that the total contact distance D is in a range where C holds.

Further, in order to even continuous contact opportunities for the plurality of convex portions is not cut the finger, pulling force F contact opportunities had accumulated at the time of the termination of the time is, is at L ₂ length It is necessary to decrease sharply in the non-contact section and to almost zero by the next contact opportunity.

Here, as described above, since the decrease rate of the tensile force F in the non-contact section is considered to be about five times the increase speed in the contact section, when the tensile force F is decreased to 0 during non-contact, L ₁ such as the following relationship between L ₂ and is satisfied.

_{L 2> L 1/5 ···} (viii)
That is, in order to reduce the F to 0 in the non-contact section, the length L ₂ of the recessed portion of the uneven shape of the sheet edge may be in less than one fifth of the distance length L ₁ of Dototsu portion .

In the case L ₂ is too long, since there is a risk of touching a finger to the concave portion, L ₂ must be less than a certain distance M [mm]. M is the upper limit distance of the non-contact concave portion, and is considered to be about 10 mm from the size of the finger or the like.

  Here, a case where the thickness of the sheet is changed will be described.

When the sheet is thinned, the sheet thickness T decreases. At this time, from the above formula (vii),
F = μ · P · D / W
C = β · T · W (ix)
Thus, the increase rate of F in which T is not included in the equation does not change, and C decreases in proportion to the decrease in T.

Further, in the above formula (i), if D is L ₁ when F <C, L ₁ is proportional to the decrease of T in order to maintain the state of F <C when T is decreased. Need to be reduced. Therefore, when L ₁ is a function of T and the above formula (ix) is modified in F <C, the following formula is obtained.

L ₁ <{(β · W ² ) / (μ · P)} T
Since β and μ are constants, and W and P are constant in this case, if (β · W ² ) / (μ · P) = constant α,
L ₁ <α · T (x)
Holds.

That is, in order to prevent the finger from being cut at a single contact opportunity between the sheet edge and the finger, the length L ₁ of the convex portion of the uneven shape at the sheet edge, which is the length of the contact section, is set to α · T or less. There is a need to.

Further, when reducing the thickness T of the sheet, in order not to cut the finger at a time of opportunity for contact between the sheet edge and the finger needs to length L ₁ of the convex portion is also shortened accordingly.

  Next explained is a laminate sheet according to the second embodiment of the invention.

  FIG. 7 is a schematic plan view showing a schematic configuration of the laminate sheet according to the second embodiment of the present invention, and corresponds to FIG.

  Referring to the figure, the main body plane of sheet 1 is molded in the same shape as in the first embodiment of the present invention. The cross-sectional structure of the laminate sheet according to this embodiment is the same as that of the first embodiment of the present invention. Therefore, the same parts as those of the first embodiment of the present invention will be described with a focus on the differences, without repeating the description.

  Since there is a difference from the first embodiment of the present invention in the sheet end 2 of the laminate sheet according to this embodiment, the sheet end according to this embodiment will be described next.

  FIG. 8 is an enlarged schematic view showing the sheet end portion of the “Y” portion shown in FIG. 7 and corresponds to FIG.

  Referring to the drawing, the sheet end 2 has a wave shape in which peaks and valleys are repeated in plan view, and a convex portion 13 that is above the one-dot chain line 15 that is an intermediate line of displacement of the sheet end, and a concave that is at the bottom. The portions 14 are alternately present.

The length of the fingers during handling can be continuous contact with the L ₁ a length along the edge of the convex portion 13 of the sheet edge, not a convex portion due to the presence of the recessed portion 14 of the sheet edge linear length of the continuous portion, i.e., the linear length of the non-contact section of the finger and L _2.

  Next, the repetition pitch and maximum displacement of the sheet end portion of the laminate sheet in this embodiment will be described.

  FIG. 9 is an enlarged schematic view showing the sheet end portion of the laminate sheet according to the second embodiment of the present invention, wherein (1) shows the repetition pitch and maximum displacement, and (2) shows the The length along the edge from the highest point to the adjacent lowest point is shown, and (3) shows the straight line length from the highest point to the adjacent lowest point.

  First, referring to (1), the sheet end portion 2 of the laminate sheet according to this embodiment has a corrugated shape in which peaks and valleys are repeated in plan view. The interval from the convex portion of the corrugated shape to the next convex portion is a repetition pitch L, and the maximum displacement of the corrugated shape is H.

Referring now to (2), the length L ₁ along the edge of the finger and the projecting portion capable of continuous contact of the sheet edge portions, the convex portions 13 and concave portions 14 that bounded by dashed line 15 Are equal to the length L ₃ along the edge from the uppermost point 16 to the lowermost point 17 adjacent to the uppermost point 16 in a plan view of the sheet end.

Referring now to (3), the line portion shown by a chain line is the portion corresponding to the L _3, (3) is an enlarged view of the periphery thereof.

Here, the length L ₃ along the edge from the highest point 16 to the lowest point 17 can be approximated to the straight line length L ₄ from the highest point 16 to the lowest point 17. Strictly speaking, in the corrugated shape, L ₄ is shorter than L ₃ .

L ₄ is a order corresponding to the length of the longitudinal length H and the lateral length L / 2 of the right triangle hypotenuse, holds as follows equation.

_{^{L 4 = {H 2 + (}} L 2/4)} 1/2
As described above, _{L 1} is equal to _{L 3, since L 3} can be approximated as _{L 4, L 1} can be approximated as _{L 4.} Moreover, strictly L ₄ are shorter than the L ₃ in the corrugated shape, that is, L ₄ are strictly shorter than L _1, to design the L ₁ of the laminate sheet so as to be equal to L ₄ even becomes safe side, L ₁ does not deviate from the range of lengths without cuts a finger during handling.

Here, L ₁ is a numerical value in a range where L ₁ <α · T holds so as not to cut the finger. Since α is determined from the material of the laminate sheet and the characteristics of the finger, and T is the total thickness of the laminate sheet, L1 is _first determined by determining the material and configuration of the laminate sheet. Then, it is possible to obtain the As described ^{_{above, L 1 = {H 2 +}} (L 2/4)} relation repetitive pitch L and the maximum displacement H based on _{L 1} to ^1/2 is satisfied. And the specific shape of a sheet | seat edge part can be defined by the repetition pitch L and the largest displacement H being defined.

  Next, the upper and lower limits of H and L will be described.

  First, if the length of the repetition pitch L is more than 10 mm, the number of convex portions with respect to the length of the sheet edge decreases, the uneven shape of the sheet edge becomes close to a straight line, and it is easy to cut the finger. Is 10 mm. Further, if the length of the repeating pitch L is less than 1 mm, the uneven shape of the sheet end becomes fine, the uneven shape of the sheet end becomes substantially linear, and it is easy to cut the finger. 1 mm. As described above, the range of the repetition pitch L may be 1 to 10 mm.

  Next, when the maximum displacement H is more than 5.0 mm, the design property is greatly changed as compared with the case where the sheet end is linear, so the upper limit is set to 5.0 mm. Further, if the maximum displacement H is less than 0.2 mm, the uneven shape of the sheet end portion becomes substantially linear and the finger is easily cut, so the lower limit is set to 0.2 mm. As described above, the range of the maximum displacement H may be 0.2 to 5.0 mm.

  Next, the manufacturing process of the laminated sheet according to the embodiment of the present invention will be described.

  FIG. 10 is a schematic process diagram showing the production process of the laminate sheet according to the second embodiment of the present invention.

  Referring to the drawing, first, in order to attach a printing surface 20 having a desired design to one surface of first aluminum foil 4, a printing process is performed in which the entire surface is printed with heat-resistant ink. Then, apart from this printing process, a first bonding process is performed in which the non-combustible paper 5 and the second aluminum foil 6 are bonded together.

  In this embodiment, the bonding in the first bonding step is performed using an adhesive, but the bonding may be performed using other means.

  In this embodiment, the entire outer surface of the first aluminum foil 4 is printed with heat-resistant ink, but printing is not always necessary.

  A second bonding step of bonding the first aluminum foil 4 after printing thus obtained and the second aluminum foil 6 bonded to the noncombustible paper 5 is performed. Punching a predetermined amount of the sheet from the raw sheet 21 of the laminate sheet in which the aluminum foil is bonded to both sides of the non-combustible paper thus obtained, and punching into a shape as shown in FIG. 7 with a Thomson blade Perform the process.

In this embodiment, non-combustible paper having a basis weight of 100 g / m ² is used, but the basis weight may be in the range of 70 to 300 g / m ² . That is, the thickness of the non-combustible paper may be 0.080 to 0.345 mm or less.

  In this embodiment, the thickness of the first aluminum foil and the second aluminum foil is 0.012 mm, but the thickness may be in the range of 0.006 to 0.050 mm. .

  In the above punching step, by using a Thomson blade having a planar wave shape instead of a linear Thomson blade conventionally used as a cutting blade used for cutting the end portion of the laminate sheet main body, the sheet end portion is A laminate sheet having an uneven shape in plan view can be punched out at a time.

  In this embodiment, each process is performed separately, but may be performed simultaneously, or a printing process may be performed after the first and second bonding processes. Further, the printing process may be performed after the punching process.

Next, a description will be given of the relationship T and L ₁ in the embodiment.

In order to measure the upper limit of the length of L ₁ that does not cut the finger even if the sheet end and the finger are in continuous contact, a commercially available sausage is regarded as a finger using the laminate sheet according to the present invention. The sheet and sausage were brought into contact with each other with a predetermined pressing force, and these were relatively moved at a predetermined speed, and the total contact distance until the sausage surface was cut was measured. Total contact length of the cut point in time is the upper limit of L _1. The relationship between the T and L ₁ upper limit, were as shown in Table 1 below.

表１のデータから、上記式（ｘ）より、α＝２２．５である。

From the data in Table 1, α = 22.5 from the above equation (x).

  Note that α is actually determined by the material of the sheet and the characteristics of the finger.

As described above, assuming that the total thickness T of the sheet is 0.086 to 0.445 mm, the constant α determined from the material of the sheet and the characteristics of the finger is obtained by the above experiment. If the length of the finger that can be continuously touched during handling is L ₁ , the tensile force F <the counter force C is established in one contact opportunity if L ₁ <α · T from the above formula (x). In addition, it is possible to design a sheet that is difficult to touch the finger at least at the first finger contact opportunity.

  In the second embodiment of the present invention, the shape of the sheet end is formed into a corrugated shape, but it may be a shape as shown in FIG.

  FIG. 11 is an enlarged schematic view showing the shape of the sheet end portion of the laminate sheet according to another embodiment of the present invention, and corresponds to FIG. 5 (1).

Referring to the drawings, in each of the embodiments from (1) to (5), the other part of the seat body is molded in the same shape as in the first embodiment of the present invention. In each of the embodiments (1) to (5), the cross-sectional structure of the laminate sheet is the same as that of the first embodiment of the present invention. Thus, without repeating the description of the first embodiment and the same parts of the embodiment of the present invention will be described focusing on the length L ₁ of the shape and the convex portion of the sheet edge with a difference.

In each of the embodiments (1) to (5), the middle line of the displacement of the concavo-convex shape at the sheet end is the alternate long and short dash line 15, the upper part is the convex part 13 with the line 15 as a boundary, and the lower part is This is a concave portion 14. The length of the fingers during handling can be continuous contact with the L ₁ a length along the edge of the convex portion 13 of the sheet edge, not a convex portion due to the presence of the recessed portion 14 of the sheet edge linear length of the continuous portion, i.e., the linear length of the non-contact section of the finger and L _2.

  First, referring to (1), in this embodiment, the uneven shape of the sheet end is obtained by rounding the corners of the convex shape of the sheet end in the first embodiment of the present invention. is there.

  Next, referring to (2), in this embodiment, the uneven shape of the sheet end portion is a trapezoidal shape.

  Next, referring to (3), in this embodiment, the uneven shape of the sheet end is obtained by adding a circle to the straight line portion.

  Next, referring to (4), in this embodiment, the uneven shape of the sheet end portion is a triangular shape.

  Next, with reference to (5), in this embodiment, a flat portion is added to the concave portion 14 in the concave-convex shape of the sheet end portion of (4).

In each of the above embodiments (1) to (5), since the uneven shape of the sheet end is formed so that L ₁ <α · T, it is difficult to cut the finger.

Incidentally, unevenness of the sheet ends be other irregularities that are not shown in the embodiments described above, it may be any L 1 _<α · T.

  In each of the above embodiments, a laminate sheet is used in which a sheet is laminated with paper and aluminum foil on both sides thereof. However, the sheet may not be a laminate.

  Furthermore, in each said embodiment, although the laminated body sheet is used as a gas range top plate cover, uses other than a gas range top plate cover may be sufficient as a laminated body sheet.

  Furthermore, in each said embodiment, although aluminum foil is used for a sheet | seat body, it replaces with this and you may use another metal foil.

  Furthermore, in each of the above-described embodiments, the non-combustible paper is used for the sheet body. However, flame retardant paper or the like may be used instead depending on the application.

  Furthermore, in each of the above embodiments, the end edge (outer peripheral edge) is formed by the Thomson blade, but the end edge (outer peripheral edge) may be formed by a blade or method other than the Thomson blade.

  Further, in each of the above embodiments, the outer surface of the first aluminum foil is printed with the whole surface heat-resistant ink, but instead of this, a silicon coat may be applied to the outer surface. In this case, since the smoothness of the outer surface of the first aluminum foil is improved, the removal of dirt by wiping becomes easier.

DESCRIPTION OF SYMBOLS 1 ... Sheet 2 ... Sheet edge part 3 ... Sheet end surface 4 ... 1st aluminum foil 5 ... Paper 6 ... 2nd aluminum foil 8 ... Finger 9-10 ... Contact surface 13 ... Convex part 14 ... Concave part 51 ... Sheet 52 ... Sheet End 53 ... Sheet end face 54 ... First aluminum foil 55 ... Paper 56 ... Second aluminum foil In the drawings, the same reference numerals denote the same or corresponding parts.

Claims (4)

A laminate sheet composed of a sheet-like paper material and a sheet made of aluminum foil attached to both sides thereof,
Peripheral portion of the sheet edge of the sheet have a concave-convex shape in a plan view,
The laminate sheet is a gas range top plate cover,
The peripheral portion has a corrugated shape in which peaks and valleys are repeated in plan view,
The length along the edge of the concavo-convex convex portion is L ₁ [mm],
The repetition pitch of the corrugated shape is L [mm],
When the maximum displacement of the corrugated shape is H [mm],
^{_{L 1 = {H 2 + (}} L 2/4)} 1/2
A laminate sheet formed on the substrate. When the linear length of the discontinuity of the convex portion due to the presence of the recessed portion before Symbol irregularities and L _{2 [mm],
L 2>} L 1/5
The laminate sheet according to claim 1, wherein the laminate sheet is formed into a layer. The pitch L is 1 to 10 mm,
The maximum displacement H is set to 0.2 to 5.0 mm.
Is set, the laminate sheet according to claim 1, wherein. The total thickness T of the sheet is 0.086 to 0.445 mm ,
L ₁ <22.5 · T
The laminate sheet according to any one of claims 1 to 3 , wherein the laminate sheet is formed as described above.

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