TWI474780B - Container assembly material - Google Patents

Description

Container assembly material

The present invention relates to a container assembly material used as a baking model (particularly, a baking model) when baking a food made from baked materials such as bread and baked goods.

Among the breads and baked goods, some are made into a baking mold of a specific shape, and in accordance with the need, after the fermentation process in this state, baking is carried out to carry out the manufacturer. Such a baking mold is conventionally formed of a metal such as aluminum. However, in recent years, a heat-resistant resin and other heat-resistant resin have been proposed (Patent Document 1).

Further, in the baking model, there is a bottomless mold which is formed without a base, and is also called a ring mold, and there is also a paper product (see Patent Document 2). The paper-made ring-shaped mold is obtained by attaching a paper material such as cardboard to a circumference of a metal rod to form a long-shaped cylinder, and cutting it into a ring of a moderate length, and coating the surface thereof. Resin is formed. The ring mold is placed on the top plate, and the material is placed inside and baked, and after the baking is finished, the mold release is performed.

Further, Patent Document 3 also discloses a baking model in which a rectangular shape is formed by joining both ends of a rectangular coated paper. Further, Patent Document 4 discloses that a heat-resistant resin material is disposed on a sheet used for baking and pie baking models. Further, Patent Document 5 discloses a baking paper tray in which a laminated paper of a synthetic resin is laminated to form a bread and a baked food, and A crucible film is formed on the inner surface thereof.

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2004-242591

[Patent Document 2] Japanese Patent Laid-Open Publication No. 2007-228886

[Patent Document 3] Japanese Registration Utility New Case No. 3013085

[Patent Document 4] Japanese Patent Laid-Open Publication No. 2001-204367

[Patent Document 5] Registered Utility New Case No. 3140826

However, the baking model described in Patent Document 1 and the paper baking model described in Patent Document 2 are cheaper than metal products, but they are inefficient in carrying a large amount of stacking, and require a large space in a storage place. The problem.

On the other hand, when the rectangular paper described in Patent Document 3 is formed into a tubular shape in which all or a part of the square surface has a linear portion, it may be difficult to maintain a desired shape.

Further, when the above-mentioned ring-shaped mold is used and baking of a plurality of breads, baked goods, and the like in a baking disk shape, in order to maintain a uniform baking temperature, there must be a proper interval between the respective ring-shaped molds. Therefore, when the ring-shaped molds are arranged in a baking disk shape, the worker must intentionally mount them in such a manner as to maintain the interval. However, contact sometimes occurs, which causes uneven browning.

Therefore, in view of the above problems, the object of the present invention is to provide excellent heat resistance and durability, high handling efficiency, save storage space, and easily maintain a desired shape while ensuring easy securing. A container for the purpose of packaging containers with a moderate interval between containers.

In order to solve the above problems, the present invention is to form a container assembly material 10 for use in a baking container 1 for food baking production by bending or bending a thin plate substrate 20 formed of a paper material, and is characterized in that it comprises: covering the above-mentioned thin plate base a heat-resistant mold release layer 30 of at least one of the covering members of the material 20, and a substantially rectangular side surface forming portion 23 surrounded by two long sides 21 and two short sides 22; disposed near each short side 22 When the two end engaging portions 24 are engaged and the two end engaging portions 24 are engaged to form the hollow cylindrical baking container 1 having the bottom surfaces open, the relative positions from the long sides 21 are formed. The reinforcing portion 26 of the complex array that protrudes in the opposite direction, the reinforcing portions 26 of the respective groups can be engaged with each other in a state of being bent toward the outer side of the hollow cylindrical shape.

Here, the "baking container 1" is a container used as a baking model when baking foods such as bread, cakes, biscuits, and the like, and in particular, a cylindrical type formed of only a frame. If necessary, the fermentation process of the material before baking can also be carried out therein.

In addition, the "container-assembled material 10" is a thin-plate-shaped member formed on the basis of the thin-plate base material 20 formed of a paper material. It is preferable to perform the dehumidification treatment before the coating of the coating layer by the sheet substrate 20 of the paper material.

The "heat-resistant release layer 30" is a layer coated on at least one side of the sheet substrate 20 to improve the food formed by baking the baking container 1. A layer having heat resistance and mold release property for the purpose of mold release property. The heat-resistant release layer 30 may be, for example, a resin layer 30 coated with a resin. The base resin layer 30 is preferably not only excellent in non-adhesiveness and heat resistance, but also in a food hygiene viewpoint, and is preferably a reaction-hardened type which does not cause problems. The heat-resistant mold release layer 30 may be applied to at least one of the thin plate base materials 20 and may be coated on both surfaces of the thin plate base material 20. At least, when the container 1 is formed by the container assembly material 10, the surface contacting the inner surface of the food must be covered with the heat-resistant release layer 30.

Further, in the present invention, the lower layer of the heat-resistant release layer 30 may be further provided with, for example, crystalline polyethylene terephthalate (C-PET) or polybutylene terephthalate (PBT). The heat resistant resin layer 40 formed of a heat resistant resin is used as a coating layer. In other words, the heat-resistant release layer 30, preferably the resin layer 30, may be further coated with the heat-resistant resin layer 40 composed of C-PET or PBT as the upper layer. By providing such a heat-resistant resin layer 40, not only the heat resistance of the container-assembled material 10 but also the restoring force can be imparted to the paper material, and the two end portions of the container-assembled material 10 formed in a cylindrical shape can be reinforced. The force of the card. This reinforcing force is enhanced to provide a heat-resistant resin layer 40 on both surfaces of the thin-plate base material 20, and the effect is further exhibited.

The "long side 21" of the thin plate substrate 20 is bent or bent when the material 10 is bent or bent, and the "short side 22" is such that the long sides 21 which are bent or bent can mutually Repeat the side of the bond.

The substantially rectangular portion surrounded by the long side 21 and the short side 22 is a "side surface forming portion 23" formed by bending or bending the long side 21 The portion of the side of the cylindrical baking container 1.

The "two-end engaging portion 24" is disposed in the vicinity of the two short sides 22, respectively. The both end engagement portions 24 may be provided on the short side 22 or in the vicinity of the short side 22 of the long side 21. Further, the shape of the both end engagement portions 24 may be any shape as long as they can be engaged with each other and overlapped and joined to the vicinity of the short side 22. For example, a notch as the both end engagement portions 24 is provided in the vicinity of one of the end portions of one of the long sides 21, and the other end portion is also provided as the both end engagement portions 24 in the vicinity of the other end portion of the other long side 21 In the notch, the notches are engaged with each other, and the side surface forming portion 23 is formed into a tubular shape. Here, the side surface forming portion 23 is "substantially rectangular" and is not necessarily a correct rectangle. The representative meaning thereof includes, for example, a rounded object or a portion where the both end engaging portions 24 protrude or form a notch.

Further, the "reinforcing portion 26" is formed by bending or bending the long side 21 and engaging the both end engaging portions 24 to form the side surface forming portion 23 in a tubular shape, and forming the opposite position from the long sides 21 to the opposite side. The part where the direction is prominent. In the reinforcing portion 26, two of the two long sides 21 are opposed to each other, and a complex array is disposed. The reinforcing portions 26 of the respective groups have a shape in which they are engaged with each other in a state of being bent outward. The shape is not particularly limited. However, for example, the engagement hole 27 is disposed in one of the reinforcing portions 26 of the respective groups, and the engaging piece 28 is disposed on the other side, and the engaging piece 28 is disposed. It is preferable that the engaging holes 27 are inserted so that the reinforcing portions 26 of the respective groups are engaged with each other. The engagement hole 27 may also be formed in a slit shape.

Further, the engagement hole 27 is formed in a trapezoidal shape in which the width is reduced as being separated from the long side 21 side of the side surface forming portion 23, and the engaging piece is formed. 28 is formed in a trapezoidal shape in which the width is increased as being separated from the long side 21 side of the side surface forming portion 23, and one of the reinforcing portions 26 of each of the groups is bent outward in a side surface of the engaging piece 28, Further, when one of the engaging holes 27 is also folded outward in the same manner as the outer side, the engaging holes 27 and the engaging pieces 28 are formed to have substantially the same shape. Further, the term "substantially identical" as used herein means that the engaging piece 28 passes through the engaging hole 27 as much as possible. In this manner, one of the reinforcing portions 26 of the respective groups has the outer side of the engaging piece 28 bent outward, and one of the engaging holes 27 is also folded outwardly toward the side, loose. When the hand is opened, the portion near the narrower portion of the width of the engaging piece 28 is fitted into the farther portion of the narrower portion of the engaging hole 27 by the restoring force of the paper. Thereby, the reinforcing portions 26 are engaged with each other without being naturally separated. Therefore, the desired cylindrical shape can be maintained. Further, by the reinforcing portion 26, the adjacent baking containers 1 do not contact each other with the side faces.

Further, the width of the engaging piece 28 may be formed to be wider than the width of the engaging hole 27, and the width of the engaging piece 28 may be a portion protruding from the width of the engaging hole 27. The separation preventing portion 29 is formed from the aforementioned engaging hole 28.

Further, when the reinforcing portion 26 is provided over the entire length of each of the long sides 21, the completed baking container 1 has a cylindrical shape in which the bottom surface has a polygonal shape. Further, when the reinforcing portion 26 is provided in one of the long sides 21, the portion where the reinforcing portion 26 is provided on the bottom surface is a straight line, and the portion where the reinforcing portion 26 is not provided has a curved shape.

Further, it is preferable that one of the reinforcing portions 26 of the plurality of arrays is provided at the position including the engaging portion of the engaging portions 24 at both ends. Thereby, the reinforcing portion 26 can also prevent the engagement of the both end engagement portions 24 from coming off.

In the container assembly material 10 of the present invention, the side surface forming portion 23 is bent or bent so that the surface on which the heat-resistant release layer 30 is provided is inside, and the engaging portions 24 at both ends of the both ends are engaged with each other. A hollow cylindrical baking container 1 can be formed. In this state, the reinforcing portions 26 provided on the long sides 21 are bent outward and are engaged with each other, so that the shape of the bottom surface of the baking container 1 can be crushed into a flat shape. Next, for example, the baking container 1 is placed on the top plate, and the material such as bread and baked food flows into the inner space of the cylindrical shape, and if necessary, the treatment such as fermentation is performed, and then placed in an oven or the like for baking. After baking, since the heat-resistant release layer 30 is provided on the inner surface of the baking container 1, bread, baked goods, and the like can be easily taken out from the baking container 1.

The container assembly material of the present invention exhibits the following effects as described above. In other words, since the heat-resistant release layer is provided, it has excellent heat resistance and durability, and is formed into a thin plate shape before being combined into a baking container, and has high handling efficiency, and can be easily decomposed into a thin plate shape after use, thereby saving use. Storage space before and after use. Further, by providing the reinforcing portion, it is possible to form a baking container which can easily maintain a desired shape and which can easily ensure a proper interval between the containers.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(1) First embodiment

Fig. 1 is a developed view of the container assembly material 10 of the first embodiment. The container assembly material 10 is used to form a thin plate-like member of the baking container 1. Specifically, the container assembly material 10 is composed of a rectangular side surface forming portion 23 surrounded by two long sides 21 and two short sides 22 opposed to each other; and each of the long sides 21 protrudes in the opposite direction. A reinforcing portion 26 of a complex array (four groups in the first drawing) is provided. Further, a part of the notch is formed in the vicinity of the end portion of each long side 21 so as to reduce the width in the direction of the short side 22, and the both end engaging portions 24 are further formed by the wedge-shaped notch. The reinforcing portion 26 is arranged along the long side 21 without a gap except for the portion where the both end engaging portions 24 are provided.

Among the reinforcing portions 26, one of the one side faces, and the trapezoidal engaging hole 27 is provided at a position where the bottom edge thereof is connected to the long side 21. In the engaging hole 27, the length of the bottom side 27a closer to the side of the long side 21 is longer than the length of the bottom side 27b of the far side. Further, among the reinforcing portions 26, one of the other sides is provided with an engagement piece 28 that protrudes in a trapezoidal shape. In the engaging piece 28, the length of the bottom side 28a closer to the side of the long side 21 is shorter than the length of the bottom side 28b of the far side. Next, the bottom side 27a on the near side of the engaging hole 27 and the bottom side 28b on the far side of the engaging piece 28 are substantially the same length. Further, the bottom side 27b on the far side of the engaging hole 27 and the bottom side 28a on the near side of the engaging piece are substantially the same length. Further, the height of the trapezoidal shape forming the engaging hole 27 and the height of the trapezoid forming the engaging piece 28 are substantially the same length. That is, the engaging piece 28 is substantially the same size as the engaging hole 27 to the extent that the engaging hole 27 can be inserted.

Next, the material composition of the container assembly material 10 will be described.

Fig. 2 is an enlarged cross-sectional view showing the container assembly material 10. As shown in FIG. 2(A), the container-assembled material 10 is coated on both sides of the thin-plate base material 20 with a coating layer. That is, the heat-resistant resin layer 40 is applied to both surfaces of the paper material as the thin-plate base material 20, and the low-temperature hardening enamel resin using the enamel resin layer 30 is applied as a heat-resistant detachment so as to be coated on the upper layer of the heat-resistant resin layer 40. Mold layer 30.

Here, the thin plate substrate 20 is made of paper weighing 200 to 450 g/m ² , preferably 250 to 350 g/m ² . The thickness of the thin plate substrate 20 is 0.3 to 1.0 mm, preferably 0.4 to 0.7 mm. Further, since it is used for foods, the sheet substrate 20 is preferably made of virgin pulp. Further, since the thin plate substrate 20 contains moisture of several weight%, usually about 7% by weight, it is preferable to carry out a dehumidifying treatment before the heat resistant resin layer 40 is applied.

As the heat resistant resin layer 40, crystalline polyethylene terephthalate (C-PET) or polybutylene terephthalate (PBT) is used. When C-PET or PBT is used as the heat-resistant resin layer 40, a strong restoring force can be imparted to the thin-plate base material 20 made of a paper material, and the restoring force of the thin-plate base material 20 which is bent or bent into a cylindrical shape can be strengthened. The engaging force between the engaging portions 24 at both ends and the engaging force of the reinforcing portions 26 are mutually.

The material of the above-mentioned base resin layer 30 is preferably a room temperature hardening type (RTV) resin. Further, the room temperature hardening type resin is, for example, a product sold in the market under the trade name of a one-pack type RTV rubber KE45 (Shin-Etsu Chemical Industry). The oxime resin is a resin in which cerium oxide is mixed with a polymer "formed by a combination of oxiranes". To make it a resin content ratio of 5 In a form of ~20% by weight, it is diluted with a solvent such as toluene and applied by spraying or the like. When it is left at room temperature for one night, the resin is hardened and the resin layer 30 is formed.

Further, an addition reaction type heat-curable oxime resin may be used instead of the above room temperature-curable enamel resin. Such a resin can be, for example, sold in the market under the trade name of KS-774 (Shin-Etsu Chemical Industries). The heat-curable resin is directly used, or it is appropriately diluted to be easily used for the viscosity of a solvent such as toluene, and a metal salt such as platinum is added as a curing catalyst, and the mixture is applied to the inner surface of the baking container by spraying or the like. Next, when the heat-curable resin is cured by heat-hardening treatment at 150 ° C or so, the resin layer 30 can be formed in the same manner.

Further, as shown in FIG. 2(B), the container-assembled material 10 may have a configuration in which only the tantalum resin layer 30 is coated on both surfaces of the thin-plate base material 20 as the heat-resistant release layer 30.

Further, although not shown, a configuration in which only the one side of the thin plate substrate 20 is coated with the resin layer 30 may be employed. At this time, when the container 1 is formed by the container assembly material 10, the base resin layer 30 is used as the inner surface side of the cylinder (the surface in contact with the food).

Next, the assembly operation of the container assembly material 10 from the container assembly 10 will be described with reference to FIGS. 3 to 6 .

The side surface forming portion 23 (Fig. 3) is bent along a folding line 25 (refer to Fig. 1) parallel to the short side 22 so as to be folded downward (indicating that the two sides are folded downward with the folding line 25 as a vertex). Further, the side surface forming portion 23 is slightly twisted, and the both end engaging portions 24 are engaged with each other (Fig. 3) to be engaged (Fig. 4) ). At the same time, each reinforcing portion 26 is also folded along the long side 21 (Fig. 3) and bent outward (Fig. 4). Here, one of the reinforcing portions 26 is opposed to each other at a position where the both end engaging portions 24 are engaged with each other (Fig. 4).

Next, the reinforcing portion 26 having one of the engaging pieces 28 is folded first, and the reinforcing portion 26 having one of the engaging holes 27 is folded so as to cover it (Fig. 5). At this time, the engaging piece 28 and the engaging hole 27 substantially coincide with each other. In this state, when the finger releases the reinforcing portion 26, as shown in Fig. 6, the reinforcing portion 26 is spread outward by the restoring force of the thin plate base material 20. At this time, the engaging piece 28 passes through the engaging hole 27, and the portion of the bottom side 28a of the proximal side of the engaging piece 28 is engaged with the portion of the bottom side 27b of the distal side of the engaging hole 27 of substantially the same length (refer to Fig. 4), the reinforcing portions 26 are engaged with each other (Fig. 6). In this state, the engaging piece 28 is not detached from the engaging hole 27 as long as no external force is applied. The engagement relationship between the engagement hole 27 and the engagement piece 28 is uniformly engaged on the four side faces, and as a result, the shape of the baking container 1 is maintained without applying an external force. In particular, the reinforcing portion 26 at the portion where the both end engaging portions 24 are engaged also facilitates the holding of the engaging portion.

The baking container 1 formed in the above manner is placed on the top plate, and the bread and baked food materials are placed inside the tube, and if necessary, the fermentation process is carried out, and then baked in an automatic conveying oven to make bread and baking. Food class. At this time, as described above, since the base resin layer 30 is formed on the inner surface of the cylinder, the baked food is easily released. Moreover, since the silicone resin layer 30 increases the mold release property, it is not necessary to apply the mold release oil, and the baking container 1 is not resistant. The deterioration of the thermal resin layer 40 can further withstand repeated use.

According to the present embodiment, since the baking container 1 is formed by combining the thin plate-shaped container assembly material 10, the height of the baking container 1 is lower than that of the three-dimensional baking container 1, and the space during storage is small. Further, both ends of the container-assembled material 10 are joined by the engagement of the engaging portions 24 provided on the respective sides, and the shape is retained by the engagement of the reinforcing portions 26 of the plurality of arrays, and the assembly and disassembly work are performed. It is easier and suitable for recycling.

In addition, since the thin plate base 20 is coated with the base resin layer 30, the mold release property is excellent, and heat resistance is enhanced by applying C-PET or PBT to the thin plate base 20 as the heat resistant resin layer 40. Further, by using C-PET or PBT as the heat-resistant resin layer 40, the restoring force of the container-assembled material 10 is increased, and the container-assembled material 10 is assembled into a cylindrical shape, and the both ends of the engaging portion 24 are reinforced by the force of returning to the original shape. The engagement with each other and the reinforcing reinforcing portions 26 are engaged with each other to prevent the shape from collapsing.

Further, as shown in Fig. 6, the reinforcing portion 26 protrudes outward from the side surface of the cylindrical shape, and when a plurality of baking containers 1 are juxtaposed on the top plate, the protruding portions of the reinforcing portion 26 are secured to each other between the side faces. Moderate interval. Thereby, the baking containers 1 are not in contact with each other, and heat can equally pass through the materials therein to prevent uneven browning.

(2) Second embodiment

In the container assembly material 10 according to the second embodiment of the present invention, as shown in Fig. 7(A), three sets of reinforcing portions 26 are provided along the long side 21. And each The reinforcing portion 26 is separated by a gap.

In the present embodiment, the combination is performed in the same manner as in the first embodiment. However, as shown in the seventh (B) diagram, the portion where the reinforcing portion 26 is not provided is formed into an arc of approximately one-third of an arc. The curved shape is a bottom surface shape in which a vertex portion is rounded and has a positive triangular shape when viewed in a plan view.

(3) Third embodiment

In the container assembly material 10 according to the third embodiment of the present invention, as shown in Fig. 8(A), two sets of reinforcing portions 26 are provided along the long side 21. Next, each reinforcing portion 26 is separated by a gap.

In the present embodiment, the combination is performed in the same manner as in the first embodiment. However, as shown in the eighth (B) diagram, the portion where the reinforcing portion 26 is not provided is curved so as to form a substantially semicircular arc. When observed, the shape of the bottom surface of the ellipse is presented.

(4) Others

In the above embodiments, the engagement holes 27 provided in the one set of the reinforcing portions 26 and the engaging pieces 28 have substantially the same shape. However, in the modification shown in Fig. 9, the width of the engaging pieces 28 is also formed. It may be larger than the width of the engaging hole 27. At this time, after the portion of the engagement piece 28 that protrudes from the width of the engagement hole 27 (preventing the detachment portion 29) is folded in advance, the folding shown in FIG. 5 is performed, and as shown in FIG. 6, the reinforcing portion is made In the state of being restored, the detachment preventing portion 29 is opened and the engagement piece 28 can be prevented from being detached from the engaging hole 27.

The present invention can be used as a baking container for breads and baked goods.

1‧‧‧Baking container

10‧‧‧Container assembly materials

20‧‧‧Sheet substrate

21‧‧‧Longside

22‧‧‧ Short side

23‧‧‧Side formation

24‧‧‧Two-end engagement

25‧‧‧ fold line

26‧‧‧Reinforcement Department

27‧‧‧Snap hole

27a‧‧‧ near the bottom edge

27b‧‧‧Bottom of the far side

28‧‧‧Clocks

28a‧‧‧ near the bottom edge

28b‧‧‧Bottom of the far side

29‧‧‧Protection from detachment

30‧‧‧Heat-resistant release layer (矽 resin layer)

40‧‧‧heat resistant resin layer

Fig. 1 is a development view of a container assembly material according to a first embodiment of the present invention.

Fig. 2 is an enlarged cross-sectional view showing the container assembly material according to the first embodiment of the present invention.

Fig. 3 is a perspective view showing the middle stage of forming a baking container by the container assembly material of Fig. 1.

Fig. 4 is a perspective view showing the middle stage of forming a baking container by the container assembly material of Fig. 1.

Fig. 5 is a perspective view showing the middle stage of forming a baking container by the container assembly material of Fig. 1.

Fig. 6 is a perspective view showing the baking container formed by the container assembly material of Fig. 1.

Fig. 7 is a perspective view (A) showing a container assembly material according to a second embodiment of the present invention, and a perspective view (B) of the baking container formed of the container assembly material.

Fig. 8 is a perspective view (A) showing a container assembly material according to a third embodiment of the present invention, and a perspective view (B) of the baking container formed of the container assembly material.

Fig. 9 is a partial exploded view showing a modification of the reinforcing portion.

10‧‧‧Container assembly materials

21‧‧‧Longside

22‧‧‧ Short side

23‧‧‧Side formation

24‧‧‧Two-end engagement

25‧‧‧ fold line

26‧‧‧Reinforcement Department

27‧‧‧Snap hole

27a‧‧‧ near the bottom edge

27b‧‧‧Bottom of the far side

28‧‧‧Clocks

28a‧‧‧ near the bottom edge

28b‧‧‧Bottom of the far side

Claims (7)

A container assembly material is a container assembly material for forming a baking container for food baking production by bending or bending a thin plate substrate formed of a paper material, comprising: a heat-resistant release layer covering the thin plate base a coating layer on at least one of the materials, and a substantially rectangular side surface forming portion surrounded by two long sides and two short sides; the two end engaging portions are provided near each short side; and plural When the reinforcing portions of the group are bent or bent, the two end engaging portions are engaged to form a hollow cylindrical baking container having two bottom surfaces open, and the opposing positions of the long sides protrude in opposite directions. The reinforcing portions of the group can be engaged with each other in a state of being bent toward the outer side of the hollow cylindrical shape. The container assembly material according to claim 1, wherein the one of the reinforcing portions of each of the groups is provided with an engaging hole, and the other of the reinforcing portions is provided with an engaging piece, and the engaging piece can be inserted into the card. The holes are closed so that the reinforcing portions of the respective groups are engaged with each other. The container assembly material according to the second aspect of the invention, wherein the engagement hole is formed in a trapezoidal shape in which a width is reduced as being separated from a long side of the side surface forming portion. The engagement piece is formed in a trapezoidal shape in which the width is increased from the long side of the side surface forming portion, and one of the reinforcing portions of the respective groups is bent outward in the side of the engaging piece, and When one of the engaging holes is also folded outward in the same manner as the outer side, the shape of the engaging hole and the engaging piece is substantially the same. The container assembly material according to claim 2, wherein the width of the engaging piece is wider than the width of the engaging hole, and the width of the engaging hole is different from the width of the engaging hole. The protruding portion forms a separation preventing portion that prevents falling off from the engaging hole. The container assembly material according to the first, second, third or fourth aspect of the invention, wherein the lower layer of the heat-resistant release layer further comprises a crystalline polyethylene terephthalate or a pair as a coating layer. A heat resistant resin layer formed of butyl phthalate. The container assembly material described in claim 1, 2, 3, or 4, wherein the paper material as the thin plate substrate is subjected to a dehumidifying treatment before being coated on the coating layer. The container assembly material according to claim 1, 2, 3, or 4, wherein the heat-resistant release layer is formed of a enamel resin.