JP4803848B2 - Resin sheet and resin container - Google Patents

Description

  The present invention relates to a resin sheet and a resin container. More specifically, the present invention relates to a use in which a sheet member whose surface is made of a polyethylene resin is heat-sealed, and a sheet member whose surface is made of a polypropylene resin. The resin sheet used to constitute the member used for both the application to be used and the application in which the sheet member whose surface is constituted by the polyethylene resin is heat-sealed, and the surface by the polypropylene resin The present invention relates to a resin container used for both uses in which a configured sheet member is heat-sealed.

Conventionally, it has been widely performed to process a resin sheet into a resin container by a sheet forming method such as vacuum forming or pressure forming.
For example, Patent Document 1 below describes that a resin sheet is molded to produce a resin container for so-called filled tofu.

As shown in the following Patent Document 1 and Patent Document 2 below, this filled tofu container is usually provided with a recess for containing a liquid containing soy milk and a coagulant and an opening edge of the recess. And a provided collar.
The liquid containing the soy milk and the coagulant is sealed by heat-sealing a sheet member covering the opening of the concave portion after being accommodated in the concave portion of the filled tofu container. Is processed into tofu.
Therefore, as described in the following Patent Document 1, when sealing with the sheet member, it is difficult to ensure a stable seal strength because soy milk or a coagulant is interposed on the seal surface. Countermeasures have been sought in the past.

By the way, as a sheet member used for sealing of the container for filled tofu, a polyamide resin or a polyester resin having excellent gas barrier properties is used as a base material, and the temperature is equal to or lower than the melting point of the resin forming the base material. A heat-sealable layer is formed on the base material using a resin composition that can be heat-sealed in the above.
As this sheet member, those in which the heat seal layer is formed using a polyethylene resin, those in which the heat seal layer is formed from a polypropylene resin, and the like are widely used.

For this reason, the container for filled tofu and the like is not only required to prevent variation in seal strength due to the presence of soy milk as described above, but also when the surface material of the sheet member is a polyethylene resin and a polypropylene resin. It is required that a stable sealing strength be exhibited in both cases of resin.
However, a resin sheet or a resin container capable of exhibiting a stable sealing strength for any of the sheet members formed on the surface with such different materials has not yet been provided to the market.

  The demand for such a stable seal strength is not only the filling tofu container and the resin sheet used for forming the filling tofu container, but also the sheet member whose surface is made of polyethylene resin is heat-sealed. And widely used in resin sheets and resin containers used to construct members used for both applications, and applications in which sheet members whose surfaces are made of polypropylene resin are heat-sealed. This is a required matter.

JP-A-63-44477 Japanese Utility Model Publication No. 56-125870

  This invention makes it a subject to solve the above problems, and was stable with respect to both the sheet | seat member in which the surface was comprised with the polyethylene-type resin, and the surface member comprised with the polypropylene-type resin. It is an object of the present invention to provide a resin container capable of exerting sealing strength and a resin sheet useful for forming a member such as the resin container.

  As a result of intensive studies to solve the above problems, the present inventor found that a member having at least a surface formed of a resin composition having a specific linear low density polyethylene resin as a base resin is made of a polyethylene resin. The present invention was completed by finding that it exhibits good heat-sealability for both the sheet member formed on the surface and the sheet member formed on the surface by polypropylene resin, and that stable sealing strength can be exhibited. It came to let you.

That is, the present invention relating to a resin sheet for solving the above-described problems includes a use in which a sheet member whose surface is made of a polyethylene resin is heat-sealed, and a sheet member whose surface is made of a polypropylene resin. A resin sheet used to constitute a member used for both a fused application and a resin composition comprising at least a surface of a linear low density polyethylene resin as a base resin and a monoglycerin fatty acid ester It is formed by the linear low-density polyethylene resin, a copolymer of ethylene and 1-hexene state, and are not polymerized by the metallocene catalyst, a liquid wherein the member comprises a a soymilk coagulant After the sheet is filled, the sheet member is heat-sealed to the surface, the liquid is sealed, and the filled beans are heat-treated in the sealed state It is characterized in that it is a use container.

In addition, the present invention relating to a resin container includes a use in which a sheet member whose surface is made of a polyethylene resin is heat-sealed, and a use in which a sheet member whose surface is made of a polypropylene-based resin are heat-sealed. A resin container used for both of the applications, wherein the surface on which the sheet member is heat-sealed is formed of a resin composition containing a monoglycerin fatty acid ester based on a linear low density polyethylene resin. cage, after the linear low density polyethylene resin, a copolymer of ethylene and 1-hexene state, and are not polymerized by the metallocene catalyst, a liquid containing the soybean milk and coagulant is filled, the A sheet member is heat-sealed to the surface to seal the liquid, and is a filled tofu container that is heat-treated in the sealed state .

  Since the surface of the resin sheet of the present invention is formed of a resin composition based on a specific linear low density polyethylene resin as a base resin, a member such as a resin container to be heat-sealed with the sheet member is provided. When forming, a member that exhibits stable sealing strength between the surface member and the sheet member can be formed by disposing the surface at the heat-sealed portion.

The perspective view which shows filling tofu. FIG. 1A is a cross-sectional view taken along line A-A ′ in FIG. 1B, and FIG.

An embodiment of the present invention will be described by taking filled tofu as an example with reference to the drawings.
FIG. 1 is a perspective view showing filled tofu, and FIG. 2 (a) is a cross-sectional view taken along line AA 'in FIG.
FIG. 2B is an enlarged view of the area surrounded by the broken line X in FIG.

  As shown in these drawings, the filled tofu 1 includes a tofu TF, a resin container 10 containing the tofu TF, and a sheet member 20 covered with the resin container 10 to seal the tofu TF. And is composed of.

The resin container 10 is a member formed by molding the resin sheet of the present invention by a sheet forming method such as vacuum forming or pressure forming. The resin container 10 includes a bottom surface portion 10b having a substantially square shape. A substantially rectangular parallelepiped housing recess for housing tofu TF is formed by the peripheral side wall 10w erected along the outer periphery of the bottom surface portion 10b.
Moreover, the said resin container 10 has the collar part 10f extended outside from the upper end of 10w of the said surrounding side wall.
That is, the flange portion 10f is formed in the resin container 10 so as to surround the substantially square opening of the housing recess.

In the present embodiment, the resin sheet used to form the resin container 10 has a seal surface layer 10L ₁ , a core layer 10L ₂ , and a back surface layer 10L ₃ as shown in FIG. This has a three-layer structure.
The resin container 10 is molded so that the sealing surface layer 10L ₁ side of the resin sheet is heat-sealed to the sheet member 20 so that the sealing surface layer 10L ₁ side is inside. is there.

Examples of the sheet member 20 include those generally used for the production of filled tofu. Examples of such a sheet member 20 include a two-layer structure of a heat seal layer 20L ₁ and a gas barrier layer 20L _2. The thing formed with the lamination sheet is mentioned.
For example, a polyolefin resin such as a polyethylene resin or a polypropylene resin is used to form the heat seal layer 20L ₁ , and a polyamide resin or a polyester resin such as a polyethylene terephthalate resin is used to form the gas barrier layer 20L _2. In the past, the ones that are used are widely used.
In this specification, the expression “the surface is made of a polyethylene resin” and the expression “the surface is made of a polypropylene resin” are used only for the surface of the polyethylene resin. It is not intended to be used only when the surface is formed of only a polypropylene-based resin, but is intended to include cases where these resins are included as part of the material constituting the surface. It is what.

This sheet member is usually used for sealing tofu by heat-sealing the surface side (heat seal layer side) formed of the polyethylene resin or polypropylene resin to the collar portion of a resin container.
The filled tofu 1 of this embodiment is also made of tofu TF by heat-sealing the heat seal layer 20L ₁ of the sheet member 20 and the seal surface layer 10L _{1 of the} resin sheet constituting the flange portion 10f. Sealed.

The tofu TF sealed inside in the filled tofu 1 is obtained by injecting a liquid containing soy milk and a coagulant into the housing recess of the resin container 10, and then the sheet member 20 is melted into the flange 10 f. It is put into a sealed state and heated and solidified in the sealed state.
As this coagulant, magnesium chloride or calcium sulfate is generally used, and the amount of use is adjusted depending on the hardness and flavor of tofu to be obtained.
The liquid may also contain an antifoaming agent or the like to prevent bubbles from forming in the tofu.
And if air is interposed between the formed tofu TF and the sheet member 20, it may be difficult to maintain the tofu flavor for a long period of time, so the sheet is usually removed in the state where the air is expelled. The heat seal layer 20L ₁ and the seal surface layer 10L ₁ are heat-sealed in a state where the liquid overflows from the accommodating recess to the flange portion 10f so that the member 20 can be sealed.
Therefore, a soy milk component, a coagulant component, an antifoaming component, and the like are easily interposed between the sheet member 20 and the flange portion 10f, and it is difficult to obtain a stable seal strength between the sheet member 20 and the flange portion 10f. It has become.
In addition, according to the discovery of the present inventor, in recent years, an increasing number of cases where glucono-δ-lactone is used as the coagulant in filled tofu, and accordingly, variations in seal strength have become a problem. Yes.
That is, in particular, the use of glucono-δ-lactone as the coagulant seems to cause a significant variation in seal strength.

The influence of these inclusions is known for the stability of the seal strength, but another cause that makes it difficult to stabilize the seal strength is that manufacturers that manufacture filled tofu It is mentioned that the material of the sheet member 20 is not unified.
Therefore, for example, even if it is possible to provide a resin container capable of exhibiting a stable sealing strength for a manufacturer that uses a sheet member formed by a polyethylene-based resin for sealing a tofu, Conventionally, it has been difficult to provide a resin container that exhibits stable sealing strength to another manufacturer that uses a sheet member in which a heat seal layer is formed of a polypropylene resin.
Since there is a variation due to inclusions, it is particularly difficult to exhibit a stable sealing strength between the resin container 10 of the filled tofu and the sheet member 20 as compared with other applications. Yes.

As described above, when a polyethylene resin is selected as a material for forming the heat seal layer 20L ₁ or a polypropylene resin is selected, in order to exhibit stable sealing strength, the resin It is important to use a resin composition containing a linear low density polyethylene resin as a base resin for forming the sealing surface layer 10L ₁ of the resin sheet constituting the container 10.

As the linear low-density polyethylene resin used as the base resin of this resin composition, ethylene and α-olefin are used in the presence of a metallocene catalyst, or in the presence of a chromium-based catalyst, or a chromium-based catalyst and a Ziegler-Natta catalyst. And those obtained by gas phase polymerization or liquid phase polymerization in the presence of.
Examples of this α-olefin include 1-butene, 1-hexene, 1-octene and the like.
Among these, a linear low density polyethylene resin in which ethylene and 1-hexene are copolymerized by a metallocene catalyst is particularly provided between the seal face layer 10L ₁ and the heat seal layer 20L _{1 in} which this resin composition is used. It is important to adopt it as a base resin in that good sealing properties can be exhibited.

  This linear low density polyethylene resin (hereinafter also referred to as “LLDPE (C6)”) in which ethylene and 1-hexene are copolymerized by a metallocene catalyst is JIS K7210 in that it can exhibit excellent heat sealability. The melt flow rate measured based on the above is preferably 0.5 g / 10 min or more and 2.0 g / 10 min or less, more preferably 0.8 g / 10 min or more and 1.6 g / 10 min or less. It is particularly preferably 1 g / 10 min or more and 1.3 g / 10 min or less.

Moreover, it is preferable that melting | fusing point measured by JISK7121 is 95 to 102 degreeC, and it is more preferable that it is 96 to 100 degreeC.
Furthermore, it is preferable that the degree of crystallinity is also within a predetermined range in that excellent heat sealability can be exhibited. For example, the density measured based on JIS K7112 is 0.890 g / cm ³ or more and 0.910 g. / preferably cm ³ or less, and more preferably less 0.900 g / cm ³ or more 0.905 g / cm ^3.

Such a linear low density polyethylene resin is usually contained in the resin composition in a proportion of 45% by mass or more, preferably in a proportion of 55% by mass or more, and preferably 60% by mass or more. It is particularly preferred to contain it in a proportion.
In the case where the linear low density polyethylene resin is contained in the resin composition at such a ratio, a single type of linear low density polyethylene resin may be used, and a plurality of types of linear low density polyethylene resins may be used. However, you may make it contain so that the total amount may become the said ratio.

If the resin composition used for forming the seal face layer 10L ₁ is composed only of a linear low density polyethylene resin, the fluidity of the resin composition at the time of heat-sealing becomes too high, resulting in a resin flow. There is a possibility that the strength may not be sufficiently exhibited.
For this reason, the resin composition further includes a polyolefin resin having a higher melting point than the linear low-density polyethylene resin and excellent compatibility with the linear low-density polyethylene resin. It is preferable to make it.
The polyolefin resin that constitutes the resin composition together with the linear low density polyethylene resin is preferably a polypropylene resin, and more preferably a random resin containing 10% by mass or less of an ethylene component rather than a polypropylene homopolymer (homo PP). A copolymer (random polypropylene resin) is preferred.

  Among random polypropylene resins, the random polypropylene resin used in combination with the LLDPE (C6) has a melt flow rate (JIS K7210 230 ° C.) of 1.0 g / 10 min or more and 2.0 g / 10 min or less. It is preferably 1.2 g / 10 min or more and 1.8 g / 10 min or less, particularly preferably 1.3 g / 10 min or more and 1.7 g / 10 min or less.

Moreover, it is preferable that melting | fusing point measured by JISK7121 is 140 to 155 degreeC, and it is more preferable that it is 143 to 150 degreeC.
Further, as the random polypropylene resin used in combination with the LLDPE (C6), density measured based on JIS K7112 is preferably at most 0.890 g / cm ³ or more 0.920g / cm ^3, 0. and more preferably 905 g / cm ³ or more 0.915 g / cm ³ or less.

In addition, the preferable content of this polypropylene resin in the resin composition used for forming the seal surface layer 10L ₁ is 10% by mass or more and 40% by mass or less.

In particular, when LLDPE (C6) and the above random polypropylene resin are used in combination, the sealing surface layer 10L ₁ is formed so that the mass ratio is 80:20 to 55:45 (LLDPE (C6): random polypropylene resin). Preferably, the seal surface layer 10L ₁ is formed so as to be 75:25 to 60:40 (LLDPE (C6): random polypropylene resin).

Furthermore, this seal face layer 10L ₁ constitutes the inner surface of a resin container that comes into contact with a liquid containing the soy milk or the like when a general filled tofu container is formed.
Therefore, considering the ease of taking out tofu TF, it is preferable that the resin composition contains an effective component as a mold release agent.
Examples of the release agent component include monoglycerin fatty acid esters such as stearic acid monoglyceride.
These monoglycerin fatty acid esters are components that are also used in tofu defoaming agents and the like, so that they can be said to be particularly preferable substances as a release agent component to be contained in the resin composition even in consideration of hygiene. .
In addition, even if this monoglycerin fatty acid ester is contained in the resin composition used for forming the seal face layer 10L ₁ , there is a risk of inhibiting heat fusion with the heat seal layer 20L ₁ as long as it is not contained excessively. Low.

In addition, when producing filled tofu, after filling the above-mentioned soymilk into a resin container and sealing with a sheet member, heating is usually performed at a temperature of about 70 to 90 ° C. for about 1 to 10 minutes. .
Usually, the melting point of the linear low density polyethylene resin is about 110 ° C. Under the heating conditions for this soymilk coagulation, the molecules of the linear low density polyethylene resin are mutually in the seal face layer 10L _1. The constraint due to the intermolecular force is released to some extent.
That is, the heating for coagulation of soy milk acts to assist the migration of monoglycerin fatty acid esters in the linear low density polyethylene resin, and the concentration of monoglycerin fatty acid esters on the inner wall surface side of the container is increased. It will be promoted.
Therefore, it can be said that monoglycerin fatty acid esters and linear low-density polyethylene resin are suitable as a combination of a base polymer and a release agent component.

The back surface layer 10L ₃ constituting the surface opposite to the seal surface layer 10L ₁ in the resin sheet, and the core layer in contact with these layers inside the back surface layer 10L ₃ and the seal surface layer 10L ₁ 10L ₂ is not particularly limited in its constituent materials, but can be appropriately selected from the production efficiency and cost of a resin sheet that is a forming material for a resin container, the strength required for the resin container, and the like.

For example, the resin sheet used for forming the resin container is preferably manufactured continuously by an extrusion method or the like from the viewpoint of manufacturing cost. For example, the seal surface layer 10L ₁ , the core layer 10L ₂ , the back layer In the case of producing a 10L ₃ three-layer resin sheet, it is preferable to co-extrusion (three-layer co-extrusion) to integrate the layers in order to simplify the process and improve adhesion between layers. Is the method.

  On the other hand, from the viewpoint of the strength required for the resin container, the resin sheet has a moderate stiffness while being thin to some extent, and is sticky even at low temperatures (it is difficult to cause low temperature embrittlement). ) Is preferred.

For the seal surface layer 10L ₁ , since the resin composition using the linear low-density polyethylene resin as a base resin as described above is used, the core layer 10L ₂ in contact with the seal surface layer 10L ₁ A material that has an affinity for the linear low-density polyethylene resin that is the main material of the seal surface layer 10L ₁ , is less susceptible to low-temperature embrittlement, and is stronger than the linear low-density polyethylene resin It is preferable that it is formed of.

From such a viewpoint, the core layer 10L ₂ is preferably formed of a resin composition using a polypropylene resin as a base polymer.
Of the polypropylene resins, homopolymer (homo PP) is a resin that has high bending elasticity and is effective for imparting “stiffness” to the resin sheet. On the other hand, homo PP tends to cause low-temperature embrittlement. Therefore, it is preferable that the resin composition forming the core layer 10L ₂ further contains random PP, low density polyethylene resin, high density polyethylene resin, or the like to suppress embrittlement at low temperature.
Further, the resin composition forming the core layer 10L ₂ can be further blended with a colorant or the like to improve the appearance of the resin container.

Since the back layer 10L ₃ constitutes the outer surface of the resin container, it is preferable to employ a resin composition having high hardness to prevent the resin container from being damaged.
Also, as with it that preferably has a high affinity between the sealing surface layer 10L ₁ and the core layer 10L _2, the resin composition constituting the back surface layer 10L ₃ in contact with the core layer 10L ₂ is It preferably has an affinity with the resin composition constituting the core layer 10L ₂ .
From this point of view, the resin composition constituting the back layer 10L ₃ is preferably a polypropylene resin as a base resin, and is based on homo PP in that it can impart excellent surface hardness to a resin container. It is preferable to use a resin.

The thickness of each of the sealing surface layer 10L ₁ , the core layer 10L ₂ , and the back surface layer 10L ₃ in this resin sheet varies depending on the use of the resin sheet, but as in this embodiment, the resin for filling tofu is used. In the case of the one used for the container 10, it is preferable that the seal surface layer 10 </ b> L ₁ has a thickness of 10 μm or more in that the excellent seal strength can be exhibited more reliably.
On the other hand, even if the thickness is increased excessively, the thickness of the resin sheet only increases and it becomes difficult to further improve the sealing strength.
In such a point, it is preferable that the seal surface layer 10L ₁ has a thickness of 100 μm or less.
Moreover, it is preferable that the thickness of the core layer 10L ₂ is usually 100 μm or more and 1 mm or less from the viewpoints of the stiffness of the resin sheet and the workability in sheet molding.
Furthermore, the thickness of the back surface layer 10L ₃ is preferably 10 μm or more and 100 μm or less from the viewpoint of imparting surface hardness to the resin sheet (resin container).

In the present embodiment, the resin sheet is exemplified as described above. However, for example, those having a two-layer structure or a laminate structure having four or more layers are also within the scope of the present invention. .
Furthermore, even in the case of a single-layer resin sheet consisting only of a resin composition based on a linear low density polyethylene resin as a base resin, a sheet member whose surface is composed of a polyethylene-based resin is heat-sealed. In the case where the surface member is used for forming a member commonly used for the purpose of heat-sealing a sheet member having a surface made of a polypropylene resin, it is within the range intended by the present invention.

Et al is not described in detail here, a conventionally known technique regarding a resin sheet or resin container, also be employed in the resin sheet or resin container of the present invention as long as the effect of the present invention is not significantly impaired Is possible.

  EXAMPLES Next, although an Example is given and this invention is demonstrated in more detail, this invention is not limited to these.

(Sheet material)
The sheet members shown in Table 1 below were prepared for use in the evaluation of seal strength.

(Resin sheet)
The raw materials shown in Table 2 below were used for the production of the resin sheet to be used for evaluation of the seal strength.

Using the materials as described above, the following N and A to F resin sheets were prepared according to the formulation shown in Table 3 below.
Note that “E” and “F” are the same in materials used, and only have different layer thicknesses as described later.

  Each layer and total thickness of the resin sheets N and A to F are as shown in Table 4 below.

(Seal strength stability evaluation)
Heat seal device (manufactured by Tester Sangyo Co., Ltd.) by contacting the resin sheet of N, A to F, and the sheet members 1 and 2 with the polyethylene resin layer or polypropylene resin layer of the sheet member and the sealing surface layer of the resin sheet. The sheet member and the resin sheet were thermally fused by applying a pressure of 0.2 MPa for 0.7 seconds at a temperature of 150 ° C. to 210 ° C. according to the model name “TP-701A”).
It should be noted that the sheet member and the resin sheet are pulled in the direction of 180 degrees with respect to the heat seal portion having a width of 10 mm and a length of 50 mm formed by this heat-sealing, and peeled in the length direction “180 "Peel strength" was measured using a tensile tester (measurable range: 5 kgf or less) manufactured by Tester Sangyo.
In addition, each measurement sample was produced 3 each, and the tension | pulling speed was 300 mm / min.
Each measurement result (arithmetic average value of n = 3) is shown in Table 5 below.

Also from this table, the A to F resin sheets having a surface (seal surface layer) formed by a resin composition based on a linear low density polyethylene resin as a base resin are sheets whose surfaces are made of a polyethylene resin. It can be seen that both the member (sheet member 1) and the sheet member (sheet member 2) whose surface is made of a polypropylene-based resin have good sealing strength.
On the other hand, the resin sheet N having a surface formed of a resin composition based on a low-density polyethylene resin by a high-pressure method has a good seal against a sheet member (sheet member 1) having a surface made of a polyethylene-based resin. Although the strength is exhibited, the sheet member (sheet member 2) whose surface is made of a polypropylene resin exhibits only a low sealing strength, which indicates that it is difficult to obtain a stable sealing strength.

  In addition, regarding the results in Table 5, the results having the seal strength of 2500 gf / cm or more having excellent seal strength as “◯” judgment and those having less than 2500 gf / cm as “x” judgment are shown in Table 6. .

  Also from Table 6, even when the surface (seal surface layer) is formed by a resin composition having a linear low-density polyethylene resin as a base resin, the linear chain having 1-hexene as a copolymerization component is used. In the case of using the low density polyethylene resin (resin sheets E and F), it is understood that the variation in the seal strength due to the difference in the heat fusion temperature is suppressed, and the stability of the seal strength is particularly excellent.

  Therefore, by using a resin sheet such as A to F to produce a member such as a resin container, the surface is heat-sealed with a sheet member made of a polyethylene resin, and the surface is polypropylene. It can be seen that the sheet member made of resin can be shared by both uses for heat-sealing.

(Production Examples 1-6)
A filled tofu container as shown in FIGS. 1 and 2 was prepared using a resin sheet having a three-layer structure of a sealing surface layer, a core layer, and a back surface layer.
The constituent materials of the resin sheet are as shown in Table 7 below.

Using the filled tofu containers of Production Examples 1 to 6, a trial was conducted at a filled tofu maker employing glucono-δ-lactone as the coagulant, and the filled tofu containers of Production Examples 4 and 5 were obtained. Has been confirmed to exhibit a stable sealing property with respect to the sealing member for sealing the filled tofu.
Therefore, when a linear low density polyethylene resin having 1-hexene as a copolymerization component is used to form the surface on which the sealing member is heat-sealed, the sealing strength suitable as a container for filled tofu It can be seen that those having excellent stability are formed.

DESCRIPTION OF SYMBOLS 1 Filling tofu 10 Resin container 10L ₁ Sealing surface layer 10L ₂ Core layer 10L ₃ Back surface layer 10b Bottom surface part 10f Gutter part 10w Peripheral side wall 20 Sheet member 20L ₁ Heat sealing layer 20L ₂ Gas barrier layer TF Tofu

Claims (4)

Constructs members that are used for both applications in which sheet members whose surfaces are made of polyethylene resin are heat-sealed and sheet members whose surfaces are made of polypropylene resin are heat-sealed It is a resin sheet used for
At least the surface is formed of a resin composition containing a monoglycerin fatty acid ester based on a linear low density polyethylene resin, and the linear low density polyethylene resin is a copolymer of ethylene and 1-hexene. state, and are not polymerized by the metallocene catalyst, wherein the member after the liquid containing the the soymilk coagulant is filled, the liquid wherein the sheet member is heat sealed to the surface is sealed, it is the sealed A resin sheet, which is a filled tofu container that is heat-treated in a heated state . The resin sheet according to claim 1, wherein the coagulating agent is glucono -δ- lactone. Resin container used for both applications in which a sheet member whose surface is made of polyethylene resin is heat-sealed and in which a sheet member whose surface is made of polypropylene resin is heat-sealed Because
The surface to which the sheet member is heat-sealed is formed of a resin composition containing a monoglycerin fatty acid ester based on a linear low density polyethylene resin, and the linear low density polyethylene resin is composed of ethylene and 1 - a copolymer of hexene state, and are not polymerized by the metallocene catalyst, after the liquid containing the soybean milk and coagulant is filled, the liquid wherein the sheet member is heat sealed to said surface sealing A resin container characterized by being a filled tofu container that is heat-treated in the sealed state . The resin container according to claim 3 , wherein the coagulant is glucono-δ-lactone.

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