JPH08242791A - Production of sheet for cooked rice - Google Patents

Abstract

PURPOSE: To prevent taste of cooked rice from lowering without causing stickiness to the cooked rice and optimize laminate adhesive strength. CONSTITUTION: In this method for producing a sheet 2 which is put between the surface of the cooked rice and the back side of a lid IB when cooked rice is put in a body container, an air-permeable lower layer 21 of a polypropylene unwoven fabric having 3-200g/m<2> weight and a water-absorbing upper layer 22 comprising a paper sheet of wood pulp having 12-50g/m<2> weight are laminated in a coating amount of 0.5-30.0g/m<2> by an adhesive, by applying the adhesive to the nonwoven fabric face.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a take-out cooked rice, which is sold by placing cooked rice in a liquid-impermeable and gas-impermeable container, such as a plastic container, between the surface of the cooked rice and the back of the lid. Regarding the sheet to be interposed.

[0002]

2. Description of the Related Art In recent years, with the diversification of eating habits, the so-called restaurant industry has been flourishing, and the sales of take-out bowls have increased.

Rice is sold in a plastic container together with a side dish or separately from the side dish.
It has been found that at that temperature, water vaporizes as steam and condenses on the inner surface of the container. Condensed water eventually falls onto the rice, and its surface is sticky, water drops fall below the surface of the rice, and water drops do not fall off.
When the lid is opened and the lid is opened, dew condensation remains on the lid, and when the lid is placed on the table, the table may be soiled.

[0004]

However, conventionally, there is no effective means for this problem. For example, Actual Kaihei 3-
Even if the sheet described in Japanese Patent No. 108671 is arranged, the steam is absorbed by the intermediate water-absorbing sheet, and even if there is some effect, in the case of rice, a large amount of steam is generated. It cannot absorb the whole amount. Moreover, since the outer layer of this sheet is an impermeable sheet, steam does not permeate.

Therefore, the present inventors have previously proposed Japanese Patent Application No. 6-17.
As No. 9032, steam permeates, and even if the permeated steam condenses, it does not return to the rice side, so that the rice does not become sticky, and the steam permeation is adjusted so that the steam permeates too much. Therefore, the problem is to provide a sheet for cooked rice in which the rice does not feel dry and which can prevent the deterioration of the taste, and the cooked rice is placed in a container with a liquid-impermeable and impermeable lid. A sheet to be interposed between the back of the lid and a breathable lower layer of polypropylene non-woven fabric of 3 to 200 g / m ² , and 12 to 50
It has been proposed that a water absorbing upper layer made of a paper pulp paper sheet of g / m ² is laminated with an adhesive coating amount of 0.5 to 30.0 g / m ² .

However, when laminating a polypropylene non-woven fabric and a wood pulp paper making sheet, it is difficult to select an adhesive and it is difficult to obtain a desired adhesive strength because the materials are different from each other.

Therefore, a main object of the present invention is to easily obtain a desired adhesive strength under the above-mentioned prior application technique.

Other problems will be described together with the structure described later.

[0009]

[Means for Solving the Problems] The above-mentioned problems can be solved in a method for producing a sheet in which cooked rice is placed in a liquid-impermeable and air-impermeable container with a lid, and the rice is placed between the surface of the cooked rice and the back of the lid. The sheet is a polypropylene non-woven fabric 3-20
And breathable layer of 0 g / m ^2, are those of the water-absorbing layer consisting of paper sheet wood pulp 12~50g / m ² was bonded with an adhesive, and the sheet is not perforated another layer,
The lower layer is arranged on the cooked rice side and the upper layer is arranged on the lid side. The lower layer and the upper layer are laminated with the adhesive at an application amount of 0.5 to 30.0 g / m ^2, and the adhesive is It can be solved by applying and laminating to the non-woven fabric surface.

The density of the upper layer of the sheet is 0.0
1 to 0.8 g / m ³ , and the density of the lower layer is 0.01 to 0.
It is preferably 8 g / m ³ .

In the case of obtaining such a sheet, after the laminated polymer sheet is wrapped around the paper tube, the paper tube is also transversely cut at the intermediate portion in the longitudinal direction thereof while rotating the disc-shaped log cutter, and the individual cooked rice is used. Sheet roll material can be obtained.

Further, it is preferable to attach oils to at least the effective cutting surface of the log cutter during the horizontal cutting of the log cutter in the manufacturing stage.

[0013]

In the present invention, as shown in FIG. 2, since the lower layer 21 is made of polypropylene nonwoven fabric, it exhibits breathability and hydrophobicity. Further, since the upper layer 22 is made of wood pulp, it exhibits water absorption and air permeability.

As a result, the steam V from the rice 3 passes through the entire sheet 2 and reaches the back surface of the lid 1B. This lid 1B
Condensation S occurs on the back surface of the sheet due to the temperature difference from the outside air. When the condensation S drops, the upper layer 22 of the sheet 2 absorbs water. The absorbed water is hydrophobic because the lower layer 21 is made of polypropylene fiber non-woven fabric, and is hydrophobic, so that it permeates the lower layer 21 and does not permeate to the surface of the rice 3. Therefore, unlike the conventional case, the rice is not sticky.

On the other hand, the lower layer 21 is in direct contact with the surface of the rice 3, but the rice 3 does not adhere because the lower layer 21 is a nonwoven fabric layer made of polypropylene fibers.

Another feature of the sheet according to the present invention is that it does not have a three-layer sheet structure as described in the above publication but has a two-layer structure of a breathable lower layer and a water-absorbing upper layer.
Although the three-layer structure described in the above publication is effective as a packaging material for foods, it cannot be used as a sheet to be interposed between the surface of cooked rice and the back of a container, which is the object of the present invention. That is, even if water vapor permeating the hydrophobic fiber sheet of the inner layer is absorbed by the water-absorbent fiber sheet, the presence of the impermeable sheet referred to in the publication becomes a barrier, and as a result, the amount of water absorbed by the water-absorbent fiber sheet is increased. It becomes extremely small, and it cannot be used for anything that generates a large amount of steam, such as a cooked rice container, and it is hardly effective for improving the taste.
Moreover, the cost is increased due to the provision of the impermeable sheet.

Further, in the present invention, the breathable lower layer and the water absorbent upper layer are laminated with an adhesive at a coating amount of 0.5 to 30.0 g / m ² . Initially thought of using heat embossing or ultrasonic heat bonding, but in the present invention, since the water-absorptive upper layer is made of a wood pulp papermaking sheet, the adhesiveness is not sufficient, especially when heat is applied from cooked rice to bond. The strength of the papermaking sheet is weakened, and peeling easily occurs when the papermaking sheet is softened by receiving steam. Further, when heat is applied, the breathable lower layer sheet is made of a polyethylene non-woven fabric, so that it is melted to clog the vent holes and the desired breathability cannot be obtained. In this respect, when an adhesive is used, these phenomena can be avoided and the texture is good.

In the present invention, the adhesive is applied to the non-woven fabric surface and laminated. Initially, I thought about applying an adhesive to the papermaking sheet corresponding to the upper layer, but since the adhesive penetrates into the papermaking sheet, it is difficult to obtain the desired adhesive strength, and to increase the adhesive strength In addition, if the coating amount is increased, the air permeability is impaired. Therefore, it is extremely difficult to balance the air permeability and the desired adhesive strength. However, the application of the adhesive to the papermaking sheet is not completely excluded. In this case, it is desired to apply 80% or more of the applied amount of the total adhesive to the non-woven fabric surface.

However, according to the present invention, when an adhesive is applied mainly to the lower layer nonwoven fabric sheet, the amount of the adhesive penetrating into the nonwoven fabric sheet is very small and remains on the laminated surface, resulting in high adhesive strength. And high air permeability (for example, 100 seconds or less as air permeability (JIS P 8117) when 10 product sheets are stacked and measured) are obtained.

Further, since the air permeability of the sheet is well adjusted by the correlation between the amount of adhesive applied and the densities of the upper and lower layers, the steam does not permeate too much, so steam from the rice comes out. Can be suppressed, and dryness can be prevented.

[0021]

The present invention will be described in more detail by way of examples with reference to the drawings. FIG. 1 shows the state of use of the cooked rice sheet of the present invention, in which a cooked rice 3 is placed in a container 1 with a liquid-impermeable and air-impermeable lid, for example, a main body container 1A of a plastic container, and the cooked rice surface and lid 1B. The sheet 2 for cooked rice of the present invention is interposed between and.

This cooked rice sheet 2 has a polypropylene nonwoven fabric having a denier of 0.9 to 120, preferably 0.9 to 10 denier, 3 to 200 g / m ² , preferably 12 to 50.
g / m ² breathable lower layer 21 and 12 to 50 g / m ² , preferably 15 to 30 g / m ² , more preferably 18 to 27 g /
A water-absorptive upper layer 22 made of a m ² wood pulp paper sheet is laminated with an adhesive layer 23, and the coating amount thereof is 0.5 to 30.0 g / m ² , preferably 0.5 to
It is set to 2.0 g / m ² .

In this case, the cooked rice sheet 2 does not have an impermeable sheet unlike other layers such as conventionally known sheets, and the lower layer 21 is placed on the cooked rice 3 side and the upper layer is placed on the lid 1B side. .

The breathable lower layer 21 is made of polypropylene non-woven fabric. Polyethylene, polyester, rayon non-woven fabric and the like are also conceivable, but they are not preferable because they have adhesiveness to rice and show water absorption, and they have found that polypropylene non-woven fabric is most suitable.

Polypropylene nonwoven fabric has a basis weight of 3 to 50
g / m ² . Here, it is the density that is dominant,
It is set to 0.01 to 0.8 g / m ³ . Density is 0.01g /
If it is less than m ³ , the water absorbed by the upper layer may be transmitted to the rice side, and the rice may become sticky. Also, 0.8
If it exceeds g / m ³ , air permeability is impaired.

The upper layer comprises a papermaking sheet of 12-50 g / m ² of wood pulp. If the basis weight is small, the water absorption is not good, and conversely, if the basis weight is large, not only the material cost increases, but also the air permeability is impaired. As the upper layer, LBK
P: NBKP = 1: 0.3 to 1.5 can be obtained by an ordinary papermaking method. Naturally known additives such as wet strength agents can be added. Also in this upper layer, the density is dominant, and 0.01 to 0.8 g
/ M ³ The reason for the upper and lower limits is the same as the reason for the lower layer. Particularly preferred is crepe paper. The crepe ratio is 1 to 40%, particularly preferably 3 to 15%.
Water absorption increases when creped.

As the adhesive 23, for example, an appropriate adhesive such as urethane resin (polyester urethane, polyether urethane, etc.), ethylene-vinyl acetate copolymer resin, acrylic ester resin, etc. is applied (dry weight). 0.5 to 30 g / m ² as the above), and the lower layer and the upper layer are laminated by adhesion to obtain a soft texture. When the coating amount is 0.5 g / m ² , the laminating (adhesion) strength is low, and conversely, when it exceeds 30 g / m ² , air permeability and texture are impaired.

As described above, the adhesive is applied to the non-woven fabric surface and laminated. For the reasons stated in the action column, preferably the entire amount is applied to the nonwoven surface.
This adhesive can be applied not only by solid coating on the entire surface but also by intermittent coating such as a grid pattern. As a coating method, a blade coating type, a knife coating type, a roll coating type, a curtain coating type and the like can be used, but the roll coating type is practical. In the roll coating method, as shown in FIG. 3, the convex portion 30A and the concave portion 30B
Using a gravure roll engraving and in a grid pattern,
It is preferable since the air permeability can be secured mainly in the convex portion 30A. The coating area of the grid can be, for example, 2.5 mm × 2.5 mm. The amount of application can be freely adjusted by adjusting the application concentration (viscosity) and the application area of the grid.

On the other hand, the air permeability of the entire sheet (JIS P
8117) is 100 seconds or less, preferably 50 seconds or less, and particularly preferably 10 seconds or less when 10 product sheets are stacked and measured.

The sheet of the present invention is, in addition to a sheet, preferably wound in a roll shape like a toilet paper as shown in FIG. 4 and perforated with a predetermined length (a size that covers the entire surface of the rice). It is roll 10 which formed 10A.
According to this mode, after the roll 10 is held in an appropriate holder at the store, it is perforated 10A each time it is sold.
The surface of the rice can be covered by separating from.

The manufacturing method of the present invention will be described in more detail. FIG. 5 shows an example of manufacturing equipment. After the non-woven fabric sheet 21 is unwound from its original fabric 21A, the adhesive 23 is picked up and applied by the gravure roll 30 while the back is held by the rubber roll 31, and this is dried. Machine 32
After being dried at about 35 to 70 ° C. by means of the above, it is laminated between the steel roll 33 and the rubber roll 34 with the papermaking sheet 22 fed from the original fabric 22A to form a long roll 100.

In this case, as shown, the nonwoven sheet 2
It is desirable to wind the sheet 1 with the sheet 1 placed outside the papermaking sheet 22. That is, finally, as shown in FIG. 6, for the tail end of the roll 100, as shown in FIG.
6 is fixed to the tail portion by spraying the adhesive 35 with the adhesive 35. At this time, when the nonwoven fabric sheet 21 is placed inside as shown in FIG. 7, the adhesive 35 is repelled because the nonwoven fabric sheet 21 is hydrophobic. While, as shown in FIG. 8, when the papermaking sheet 22 is placed inside and the adhesive agent 35 is applied to the papermaking sheet 22, high adhesion strength can be obtained.

The sheet of the present invention is a product containing a nonwoven sheet. In the case of this type, conventionally, as shown in FIG. 9, the sheet S is wound while being cut by the slitters 40, 40 before winding. However, with this, it is difficult to align the end faces of the rolls, the value of the product is reduced, and the productivity is not high. Therefore, preferably,
As shown in FIG. 10, a long roll 100 wound around a paper tube 101 is cut at its intermediate portion in the longitudinal direction while the disk-shaped log cutter 41 is rotated, and the paper tube 101 is also transversely cut to obtain an individual cooked rice sheet. It is desirable to obtain roll 10. A plurality of log cutters 41 can be arranged in the longitudinal direction according to the length of the long roll 100 and the length of the target roll 10.

The nonwoven fabric sheet is originally a material that is difficult to cut with a cutter, frictional heat is generated during cutting, and the nonwoven fabric may be melted by the heat, and the melted portion adheres to the blade of the cutter as foreign matter, The deposit may be transferred to the end surface of the roll and lose its value as a product.

Therefore, when cutting with the log cutter 41, it is desirable to attach oils to at least the effective cutting surface of the log cutter during horizontal cutting, as shown in FIG. In the example shown in FIG. 11, with respect to the blade of the log cutter 41 which is rotationally driven by the motor 42, the paraffin oil 43 is supplied from the tank 43A to the impregnating and flexible contact member 45 such as felt via the conduit 44. Then, while making the contact member 45 contact the blade of the log cutter 41 continuously or intermittently, the paraffin oil 4
3 is attached.

In a more preferable second example shown below, paraffin oil 43 is pressure-fed from an air lubricator 43B through a conduit 46, and a nozzle 46A at the tip of the paraffin oil 43 is projected onto the blade surface of the log cutter 41 to be attached thereto. .
An air source 47 can be used to pump the oil 43. Reference numeral 48 is a pressure reducing valve with a filter.

The pressure feeding of the oil 43 can be started and stopped by opening and closing the corresponding solenoid valve 50 by the solenoid valve controller 49.

Since the paper tube 101 is cut by the log cutter 41, in order to prevent the paper tube 101 from being crushed, it has a size of 35 square meters.
It is preferably 0 g / m ² or more.

(Experimental Example) Next, the effect of the present invention will be described with reference to an experimental example.

That is, a sheet having variously changed lower sheet material, its weight per unit area and density, upper layer weight per area and density, adhesive application amount, its application pattern, etc. was obtained, and the air permeability, adhesive strength, and When the characteristics of the product were examined, the results shown in Table 1 were obtained.

The adhesive strength is 50 mm in width and 100 in length.
Peel up to 10 mm from the end of the mm test piece on paper and non-woven fabric,
It was grasped by a clamp for attachment of a tensile tester (JIS P8113) and measured. As the grid in the column of the adhesive coating pattern, as shown in FIG. 3, 2.5 mm × 2.
A 5 mm one was used. The air permeability was measured by stacking 10 test pieces according to the JIS P8117 method.

[0042]

[Table 1]

[0043]

As described above, according to the present invention, steam permeates, and even if the permeated steam condenses, it does not return to the rice side. Therefore, the rice is not sticky and steam By adjusting the amount of permeation, the dryness of rice can be suppressed and the deterioration of the taste can be prevented. More particularly, according to the present invention, excellent laminate adhesive strength can be obtained in correlation with air permeability.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an essential part of a seat of the present invention in a use state.

FIG. 2 is a sectional view of a seat configuration.

FIG. 3 is a partially enlarged explanatory view of the surface of the adhesive coating gravure roll.

FIG. 4 is a perspective view of a roll-wound sheet.

FIG. 5 is a schematic diagram of an example of manufacturing equipment.

FIG. 6 is a schematic diagram of an example of fixing a roll tail portion.

FIG. 7 is an explanatory diagram of a comparative example.

FIG. 8 is an explanatory diagram of a preferred example.

FIG. 9 is a schematic perspective view of a cutting example of a conventional general example.

FIG. 10 is a schematic perspective view of a cutting example according to the present invention.

FIG. 11 is a schematic diagram of an example of equipment for supplying oil to a cutter in the cutting equipment according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Container, 1A ... Main body container, 1B ... Lid, 2 ... Rice sheet, 10 ... Roll, 21 ... Lower layer, 22 ... Upper layer, 23 ... Adhesive.

Claims (4)

[Claims] 1. A method for producing a sheet in which cooked rice is placed in a container having a lid that is impermeable and impermeable to air and is interposed between the surface of the cooked rice and the back of the lid, wherein the sheet is made of polypropylene non-woven fabric. ~ 200g
/ M ² breathable lower layer and a water absorbent upper layer consisting of 12-50 g / m ² wood pulp paper making sheet are joined by an adhesive, and this sheet has no other layers, The lower layer is arranged on the cooked rice side, and the upper layer is arranged on the lid side. The lower layer and the upper layer are laminated with the adhesive at a coating amount of 0.5 to 30.0 g / m ^2, and the adhesive is applied. A method for producing a cooked rice sheet, which comprises coating and laminating a nonwoven fabric surface. 2. The density of the upper layer is 0.01 to 0.8 g / m ³
The sheet for cooked rice according to claim 1, wherein the lower layer has a density of 0.01 to 0.8 g / m ³ . 3. A sheet roll material for individual cooked rice is obtained by winding a laminated polymer sheet around a paper tube, and then transversely cutting the paper tube while rotating a disc-shaped log cutter at an intermediate portion in the longitudinal direction thereof. The method for producing the cooked rice sheet according to claim 1. 4. The method for producing a cooked rice sheet according to claim 3, wherein oil is attached to at least an effective cutting surface of the log cutter when the log cutter is laterally cut.