JP2006325694A - Cooking sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an improved cooking sheet from which a top plate and foodstuff are easily peeled off and which can be repeatedly used by being washed and is excellent economically even while air permeability is secured to suit for steam cooking. <P>SOLUTION: The cooking sheet is constituted by forming many air-permeable pores 4 penetrating the front surface and back surface of a fiber reinforced sheet body 1 on the fibre reinforced sheet body 1 composed by impregnating a sheet base material 2 woven by glass fibers with fluororesin 3. The pores 4 are formed in the impregnation process of using a glass cloth 2 which is the sheet base material for which the vertical and longitudinal dimensions of cloth meshes 5 are set in a prescribed dimension range and impregnating it with the fluororesin 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a cooking sheet suitable for use on a microwave oven, gas oven or the like when baking a cake or cookie dough on a top plate of a microwave oven or oven.

  The glass fiber-containing fluororesin cooking sheet is impregnated with fluororesin between the glass fibers without any gaps. For example, when baking cookies in a microwave oven or oven, there is no sticking to the top plate or dough. In addition to being able to peel off cleanly, it is excellent in economic efficiency that can be used repeatedly by washing. As an example of such a cooking sheet, one disclosed in Patent Document 1 is known.

  Since the fluororesin-impregnated glass fiber sheet is impregnated with the fluororesin without any gap as described above and has no air permeability, it cannot pass water vapor or the like. Therefore, it is unsuitable for steamed products such as meat buns and shumai, and steams with wiping cloths or straws, but it tends to cause inconvenience that the shumai skin sticks and peels off.

In addition, as disclosed in Patent Document 2, a cooking sheet in which a large number of holes are formed in a heat-resistant silicon sheet (paper sheet) so as to be a sheet that has air permeability and is suitable for steamed foods. In this case, there is a problem that the durability is low and the cost is increased because the usage form is disposable.
Utility Model Registration Gazette No. 2582098 Utility model registration No. 3082313

  The object of the present invention is to solve the above-mentioned problems of the conventional cooking sheet, the top plate and ingredients are easy to peel off, can be repeatedly used after washing, and also ensures the breathability for cooking steamed foods. The object is to provide an improved cooking sheet which is suitable but economical.

  The invention according to claim 1 is a cooking sheet comprising a fiber reinforced sheet body 1 in which a sheet base material 2 woven with glass fibers is impregnated with a fluororesin 3, and a front surface 1a and a back surface 1b of the fiber reinforced sheet body 1. A plurality of ventilating small holes 4 penetrating therethrough are formed in a dispersed arrangement state.

  According to a second aspect of the present invention, in the cooking sheet according to the first aspect, the sheet base material 2 is a glass cloth formed by knitting fiber bundles 2A and 2B formed by bundling glass fibers vertically and horizontally. It is characterized by this.

  The invention according to claim 3 is the cooking sheet according to claim 1 or 2, wherein the small holes 4 are surrounded on all sides by the adjacent vertical fiber bundle 2A and the adjacent horizontal fiber bundle 2B in the glass cloth 2. It is characterized in that it is formed in the cross eye 5 which is a part.

  The invention according to claim 4 is the cooking sheet according to any one of claims 1 to 3, wherein the small hole 4 has a plurality of pieces in the axial direction on the fiber reinforced sheet body 1 conveyed in an extended state. The hole-forming pins 8 are fixed and formed by contacting and rotating a rotatable pin-equipped roll 7.

  According to a fifth aspect of the present invention, in the cooking sheet according to the third aspect, the small hole 4 is the glass cloth 2 in which the vertical and horizontal dimensions of the cross stitch 5 are set within a predetermined dimension range. It is formed by impregnating the fluororesin 3 with use.

  The invention according to claim 6 is the cooking sheet according to claim 5, wherein the dimension range is set to 0.2 mm to 5 mm.

  The invention according to claim 7 is the cooking sheet according to any one of claims 1 to 6, wherein the area ratio of the small holes 4 per unit area of the fiber reinforced sheet body 1 is 0.3%. It is characterized by being set in a range of ˜50%.

  According to the invention of claim 1, the cooking sheet is configured as a plurality of fiber reinforced sheet bodies formed by impregnating a fluororesin into a sheet base material woven with glass fibers. It can be peeled cleanly without sticking to the fabric, and it can be used repeatedly by washing, and it has excellent advantages in terms of economy, and it has a breathability and is suitable for steamed products. It has both advantages and benefits. As a result, it is possible to provide an improved cooking sheet that is easy to peel off, can be repeatedly used after being washed, and is excellent in terms of economy while ensuring air permeability and being suitable for cooking steamed foods. . Further, as in claim 2, if the sheet base material is formed as a glass cloth formed by knitting a fiber bundle formed by bundling glass fibers vertically and horizontally, it has sufficient strength and stable quality. A cooking sheet can be realized.

  According to the invention of claim 3, since the small holes are formed in the cross where the glass fiber does not exist, it is possible to create a large number of air holes without reducing the sheet strength, and the glass fibers are formed in the small holes. It is also possible not to be exposed. In addition, since the small holes can be regularly arranged in the vertical and horizontal directions, there is also an advantage that a cooking sheet having a good appearance can be provided.

  According to the fourth aspect of the present invention, the pin can pass through the fiber reinforced sheet body to form a small hole by bringing the roll with the pin into contact with the cooking sheet conveyed in the extended state and rotating it. Accordingly, a plurality of pins can be arranged in the vertical and horizontal directions just by transporting the fiber reinforced sheet body by arranging a plurality of pins in the axial direction or circumferential direction of the roll, and in a short time. There is an advantage that a plurality of small holes can be formed efficiently.

  According to the invention of claim 5, it is possible to form small holes when impregnating with the fluororesin by setting the gap between adjacent ones of the vertical and horizontal fiber bundles forming the glass cloth to be somewhat wide. . In other words, by making the crossing area large so that the surface tension of the fluororesin liquid does not reach, the crossing line set to be larger is not filled with the fluororesin, that is, a small hole can be formed simultaneously. It becomes possible. As a result, it is possible to form a small hole without providing a dedicated hole punching means or process by setting the size of the cross, and it is possible to provide a cooking sheet that is more excellent in production efficiency and economy.

  In this case, if the set dimension of the cross stitch is set to 0.2 mm to 5 mm as in claim 6, it is convenient for the formation of small holes. In addition, if the ratio of the area of the small holes per unit area of the fiber reinforced sheet body is set in the range of 0.3% to 50% as in claim 7, the aperture ratio should have an appropriate balance. Thus, there is an advantage that the above-mentioned effect by the invention of claim 1 can be further enhanced.

  Embodiments of a cooking sheet according to the present invention will be described below with reference to the drawings. 1 to 3 show the drawings of the cooking sheet according to the first embodiment, and FIGS. 4 and 5 show the drawings of the cooking sheet according to the second embodiment.

[Example 1]
As shown in FIGS. 1 and 2, the cooking sheet A according to Example 1 includes a fiber reinforced sheet body 1 formed by impregnating a fluororesin 3 into a sheet base material 2 woven with glass fibers. A plurality of air permeable small holes 4 penetrating over the front surface 1a and the back surface 1b are formed in a dispersed arrangement state.

  The sheet base material 2 is a glass cloth formed by weaving a fiber bundle formed by bundling glass fibers vertically and horizontally, and has a number of longitudinal fiber bundles 2A, a number of transverse fiber bundles 2B, and a number of cloth eyes 5. Configured. The cross 5 is a portion of the glass cloth 2 that is surrounded on all sides by the adjacent vertical fiber bundles 2A and 2A and the adjacent horizontal fiber bundles 2B and 2B. Next, the manufacturing method of the cooking sheet A by Example 1 is demonstrated.

  First, the glass cloth 2 is immersed in an aqueous tetrafluoroethylene resin suspension (resin content: 60% by weight), impregnated by the immersion process, and then in an electric furnace such as a vertical type at 100 ° C. for 1 minute. A drying process is performed. Next, a removal step of removing the surfactant contained in the suspension by performing a treatment at 250 ° C. for 1 minute is performed, and finally a treatment step of performing a baking treatment at 360 ° C. for 1 minute is performed. One cycle of these series of steps (immersion, impregnation, drying, surfactant removal, fluororesin firing) was repeated twice to prepare a fiber reinforced sheet body 1.

  The amount of fluororesin at the end of one cycle of each process was 52 grams / square meter, and the amount of fluororesin deposited after the end of two cycles was 50 grams / square meter. As a result, as shown in FIG. 2, a fiber reinforced sheet body 1 having a weight of 150 g / m 2 (glass cloth 2 being 48 g / m 2 and fluororesin being 102 g / m 2) and having a thickness of 85 μm was obtained. In the fiber reinforced sheet body 1, the cross stitch 5 is completely filled with the fluororesin 3, and the coating layers 6 and 6 of the uniform fluororesin 3 are formed on the front surface 1a and the back surface 1b.

  The molding process of the small holes 4 is as follows. As shown in FIG. 3, the small holes 4 are made to contact a fiber reinforced sheet body 1 conveyed in an extended state with a plurality of hole forming pins 8 fixed in the axial direction and rotatable with a roll 7 with a pin. It is formed by a perforating process that rotates. That is, the small hole 4 includes a transport mechanism 12 that uses a pair of first and second rotary drums 10 and 11, a roll 7 with a pin disposed above the rotary drums 10 and 11, and the rotary drums 10 and 11. It is formed by using a hole forming device b configured to have a drive mechanism (not shown) that drives and rotates either one or both.

  The first rotating drum 10 is for winding the fiber reinforced sheet body 1, and the second rotating drum 11 is for cutting a product for cutting the long sheet-like fiber reinforced sheet body 1 into a predetermined length to obtain a product. belongs to. In the roll 7 with pins, a group of pins 9 formed by linearly arranging pins 8 in the lateral direction of the fiber reinforced sheet body 1 in the axial direction (the direction of arrow A) is arranged at appropriate intervals in the circumferential direction on the roll body 7a. It consists of being planted. When the roll 7 with a pin comes into contact with the fiber reinforced sheet 1 conveyed from the first rotating drum 10 to the second rotating drum 11 from above, it is possible to form a clean and uniform small hole 4. A large number of small holes 4 functioning as water vapor passage openings and air holes are 1 to 2 mm in diameter and are formed at intervals of 10 to 15 mm in the vertical and horizontal directions.

  That is, by forming a large number of small holes 4 in the fiber reinforced sheet body 1, a cooking sheet (cooking sheet with holes) A shown in FIG. 2 as the final product is created. The roll 7 with the pin is synchronized (or not synchronized) with the fiber reinforced sheet body 1 by means of being rotated by contacting the fiber reinforced sheet body 1 conveyed at a predetermined speed, a driving mechanism (not shown), or the like. ) It is possible to adopt a means for driving and rotating.

  Although illustration is omitted, the pins 8 in the pin group 9 are aligned in the horizontal direction of the cross eye 5, and the pin group 9 is aligned in the circumferential direction so as to match the vertical interval of the cross eye 5. It is possible to create the cooking sheet A in which the small holes 4 are formed in the cross eyes 5 by providing them at intervals. In this case, it is possible to form the small holes 4 for each adjacent cross eye 5 or to form one small hole or two small holes.

  The cooking sheet A produced in this manner is made of a fiber reinforced sheet body 1 made of glass cloth-containing fluororesin, with a large number of small holes 4 formed therein, so that it is more durable than a paper cooking sheet. Rich, usable temperature is as high as 260 ° C., and there is an advantage that it can be used repeatedly many times by washing. And since the small hole 4 which has air permeability is formed compared with the conventional cooking sheet made of fluororesin containing glass fiber, it can be used for cooking of steamed food that needs to pass water vapor. There is an advantage that the ingredients (meat bun, shumai, steamed bread, steamed rice bowl, steamed potato, etc.) peel off cleanly. By selecting and setting the size of the small holes 4 as appropriate, it can be used when grilling fish without accumulating excess oil and moisture, and can be peeled off neatly without sticking to the net etc. In addition, it is possible to provide a cooking sheet that does not require time and effort for cleaning.

  Here, some examples of the area ratio of the small holes per unit area of the fiber reinforced sheet body, that is, the opening ratio will be given. 1. When the cross stitch 5 is □ (square) 15 mm and the small hole 4 is 1 mm in diameter, the aperture ratio is about 0.34%. 2. When the cross 5 is □ 1 mm and the small hole 4 is 0.2 mm in diameter, the aperture ratio is about 3%. When the cross 5 is 5 mm and the small hole 4 is 3 mm in diameter, the aperture ratio is about 30%. When the cross stitch 5 is □ 5 mm and the small hole 4 is □ 3 mm, the aperture ratio is about 36%.

[Example 2]
A cooking sheet A according to Example 2 is shown in FIG. The manufacturing method of this cooking sheet A is as follows. An electric furnace such as a vertical type is formed after an immersion process in which a glass cloth 2 having a large cross 5 is immersed in an aqueous tetrafluoroethylene resin suspension (resin content: 30% by weight) and impregnated in the immersion process. A drying process is performed at 100 ° C. for 1 minute. Next, a removal step of removing the surfactant contained in the suspension by performing a treatment at 250 ° C. for 1 minute is performed, and finally a treatment step of performing a baking treatment at 360 ° C. for 1 minute is performed. By repeating one cycle of these series of steps twice, the fluororesin 3 is firmly adhered to the glass cloth 2, and a durable fiber-reinforced sheet body 1 for a cooking sheet can be produced even when used repeatedly. it can.

  The glass cloth (sheet base material) 2 used for the cooking sheet A of Example 2 has a cross cloth 5 that is wider than a normal one, and the distance d between adjacent vertical fiber bundles 2A and 2A is d. , And the distance e between the adjacent horizontal fiber bundles 2B, 2B is set to 0.2 to 5 mm. By setting the cross 5 to be larger, as shown in FIG. 5, the small holes 4 are already formed in a state where the fluororesin is impregnated in the dipping process.

  In this case, it is possible to adjust and set the size of the small holes 4 by adjusting the concentration of the aqueous tetrafluoroethylene resin suspension in the dipping step, the blending ratio of the resin, the dipping time, and the like. That is, the small holes 4 are formed by impregnating the fluororesin with the glass cloth 2 using the cloth cloth 5 in which the longitudinal and lateral dimensions of the cloth eye 5 are set in a predetermined dimension range.

  Unlike the cooking sheet according to the first embodiment, the dedicated hole forming device b and the hole making step are unnecessary, and there is an advantage that the cost can be reduced correspondingly and the production efficiency can be improved. And since a hole is not formed by post-processing, there is no possibility that the fiber-reinforced sheet body 1 will be damaged, and there is an advantage that it is possible to form a small hole that is impossible by drilling.

Various conditions for realizing the cooking sheet A according to the second embodiment, that is, for realizing the small holes 4 are as follows. ~ 4. It seems to be.
1. Impregnation rate of aqueous suspension of tetrafluoroethylene resin into glass cloth 2 40-80%
2. Ratio between the width dimension of the vertical fiber bundle 2A and the vertical width of the cross stitch 5 2: 1 to 1:10
3. Ratio between the width dimension of the transverse fiber bundle 2A and the transverse width of the cross stitch 5 2: 1 to 1:10
4). Glass cloth mass 25-230 g / mm

[Another Example]
The cooking sheet A may be one in which the small holes 4 are formed in the fiber reinforced sheet body 1 by pressing or drilling, or the small holes 4 may be randomly arranged. The sheet substrate 2 may be a glass mat in which glass fibers having a relatively short length or a long length are randomly arranged.

Partially cutaway perspective view showing the structure of the cooking sheet (Example 1) Partial plan view of the cooking sheet of FIG. Action diagram showing the outline of the drilling process Plan view of cooking sheet according to embodiment 2 Partial enlarged view of the cooking sheet of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fiber reinforced sheet body 1a Front surface 1b Back surface 2 Sheet base material 2A Vertical fiber bundle 2B Horizontal fiber bundle 3 Fluororesin 4 Small hole 5 Cross stitch 7 Roll 7 with a pin
8-pin A cooking sheet

Claims (7)

  In a fiber reinforced sheet body formed by impregnating a fluororesin into a sheet base material woven with glass fibers, a plurality of air-permeable small holes penetrating across the front and back surfaces of the fiber reinforced sheet body are in a dispersed arrangement state. Cooking sheet that is formed with.   2. The cooking sheet according to claim 1, wherein the sheet base material is a glass cloth formed by knitting fiber bundles formed by bundling glass fibers vertically and horizontally.   3. The cooking sheet according to claim 1, wherein the small holes are formed in a cross line which is a portion surrounded by four sides by adjacent vertical fiber bundles and adjacent horizontal fiber bundles in the glass cloth.   The small holes are formed by rotating a plurality of hole forming pins fixed in the axial direction on the fiber reinforced sheet body that is conveyed in an extended state, and rotating with a rotatable pinned roll. The cooking sheet according to any one of claims 1 to 3.   The said small hole is formed by impregnating a fluororesin using the said glass cloth using what the vertical and horizontal dimension of the said cross | interval was set to the predetermined dimension range. Cooking Sheet.   The cooking sheet according to claim 5, wherein the dimension range is set to 0.2 mm to 5 mm. The cooking sheet according to any one of claims 1 to 6, wherein a ratio of the area of the small holes per unit area of the fiber reinforced sheet body is set in a range of 0.3% to 50%.

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