WO2012108044A1

WO2012108044A1 - Paper container and method for producing paper container

Info

Publication number: WO2012108044A1
Application number: PCT/JP2011/052915
Authority: WO
Inventors: 伊藤　禎美
Original assignee: 有限会社ホクオーパック
Priority date: 2011-02-10
Filing date: 2011-02-10
Publication date: 2012-08-16
Also published as: CN103391882A

Abstract

The problem of the present invention is to provide a remarkably strong container made of paper which is constituted by a resin film and paper, and is used for baking or steaming confectionery, bread, etc., or for storing food, etc., wherein the resin film has an increased shape retention property. A paper container is formed by molding a laminated film in which a stretched resin film and paper are laminated, using a male die and a female die, and after the molding, heating the film at a temperature about 80 degrees to 190 degrees which is equal to or lower than the melting point of the stretched resin film for 80 seconds to 30 minutes inclusive.

Description

Paper container and method for manufacturing paper container

The present invention is a paper container used for baking or steaming confectionery, bread or the like, or containing foodstuffs, or a paper container used for other purposes and a method for manufacturing the paper container.

For example, a container with a paper basket for producing confectionery or bread by baking or steaming seeds such as confectionery or bread in a container with a basket is sold in a state of being stored in the container. Various types have been used.
That is, confectionery and bread are produced by putting the seeds for baking in a cylindrical baking mold in the state of the container and heating and baking, and the seeds swell when baking or steaming. On the other hand, a paper container having a basket for producing confectionery and bread that swells and bakes neatly is often used.

This supports the lateral bulge with elasticity, and becomes a heel part necessary to burn it cleanly by expanding the protrusion upward.
From this, many kinds of containers with a hook having this hook part are manufactured.
First, basically, for example, pure white paper, glassine paper or the like is sandwiched between a male mold and a female mold of a molding machine and pressed to mold a container with a hook.
In this case, the portion of the ridge simply pressurizes to form the ridge, and it is difficult to maintain the molded state. For example, when food is stored in the container with the ridge, the fold opens with the weight of the food. It will be.

In such a state, it is inevitably opened or opened by the weight of the food, and even if it is pressed by the baking mold, it opens in the baking mold, so that the food will spill out or it will be baked in the open state of the pot, It was only bad-looking packaging.
Therefore, the food is stored in such an amount that does not open the pot.
In addition, when it is used as a baking container or a steaming container, there is a risk that it will become a confectionery or bread placed in a deformed container due to the opening of the straw during baking or steaming.
Therefore, in the first place, baking or steaming is performed in a state where shape retention is maintained by placing in a baking mold or steaming mold at the time of firing or steaming.

Therefore, some modifications are used as expected.
For this reason, there is a baking container shown in, for example, Japanese Patent Application Laid-Open No. 10-94357 (Patent Document 1) in order to cook evenly and uniformly throughout the seeds on the premise of this.
Furthermore, in order to maintain the preserving to the extent that the gap between the seed after cooking and the container is eliminated on the premise that baking or steaming is performed in the above-mentioned baking mold or steam mold while maintaining shape retention. 11-313615 (Patent Document 2) also exists.
Furthermore, cylindrical paper containers and paper containers having corners also have a side wall portion that inadvertently bulges and easily deforms, and thick paper must be used in order to improve moldability. .
JP-A-10-94357 JP-A-11-313615

As described above, with regard to the weakness that is a drawback of containers made of paper sheets, that is, for example, inadvertent covering of the heel portion in a container with a jar, naturally, a mold is used for the firing stage and the steaming stage. Since this is what is being done, this mold prevents inadvertent opening, i.e., spreading of wrinkles.
Therefore, based on the premise that this mold is used, Patent Document 1 provides a container that can be baked quickly as a whole by making a large number of small holes in a laminated film of paper and polyester film.

In this case, a paper container and a polyester film are laminated and a container with a ridge is manufactured using the film.
This is used for the heat resistance and oil resistance of the polyester film and is not subjected to any special treatment for maintaining the shape retention.
Therefore, even in the configuration of the preceding example, the soot spreads, and when firing, a mold is used, and the container with the scissors is put in the mold and fired in a state where the soot does not open. When taken out of the mold, the wrinkles spread a little.

Next, in Patent Document 2, it is intended to prevent spreading of the ridge portion of the container during firing in the mold during firing, and to prevent separation between the fired seed and the container.
Therefore, it is sufficient that the shape retention is higher than that of a normal container with a ridge, and it is a premise that a degree of spread of the ridge caused by swelling or the like at the time of firing of the seed occurs, and at the same time, while maintaining the entire shape retention at least in the mold It is a structure for having a slight shape retention in the collar portion.
Thereby, it consists of paper and a shape-retaining synthetic resin, and it is the structure which laminates | stacks paper, for example, polyethylene etc. similarly to the above.

In this case, according to this configuration, for example, after pre-molding at about 120 degrees, it is held in a mold at 160 degrees for about 10 seconds or 20 seconds, and the shape-retaining synthetic resin is contracted to retain the shape. .
As a result, it has a certain degree of shape-retaining property, but the strength is still extremely low, and the ridge in the case of a pleated container is easily covered.
Therefore, even if molded in this way, when used as a firing container, the heel portion will inevitably open with the expansion of the seeds, etc., and it is assumed that a metallic mold or the like is used. .

In order to use this as a firing container, it is a premise that the firing container is further put into a mold at the time of firing, and it is difficult to insert a paper container into this mold. It is desired to provide a bottled container that can be fired using only a paper container.
This is not only difficult to prepare and clean this mold, but it is also very difficult to put a container with a hook in the mold one by one, and it was desired to eliminate these work as a big problem to be solved It is.
Alternatively, in the case of a container with a corner, as well as a container with a corner, qualification, or a highly shaped substantially box-shaped container, the container is molded by forming a corner fold, but the fold is inevitably opened. It is easy to lose shape.

Therefore, although a certain moldability is maintained by closing the lid, the molding strength is inevitably low, and the container is only a container that can withstand simple use for a very short time, giving an impression at low cost.
Therefore, it is desired to provide a container that can prevent the container from being deformed and having the molded portion to be opened and having the folded portion open.
Furthermore, the side, side wall or bottom of the paper container is easily deformed depending on the contents. For example, the side wall is bent or distorted, resulting in a poor-looking container. There is a possibility that the side portion and the bottom portion may not be used due to deformation of the side portion and the bottom portion.

In this case, it is possible to increase the strength of the container by increasing the thickness of the paper as much as possible. However, not only is the cost high, but the molding using thick paper requires a powerful molding equipment, which makes it difficult to manufacture. Is extremely large.
Therefore, it is desired to provide a paper container that has high molding strength, high moldability, is not deformed, and can prevent as much as possible the covering of the ridges.

Therefore, the invention according to claim 1 is a paper container for molding a film in which at least a resin film and paper are laminated using a male mold and a female mold, and the resin film is a stretched resin film, and the male mold And a paper container that is heated at a temperature of about 80 ° C. to 190 ° C. for 80 seconds to 30 minutes at least below the melting point of the laminated stretched resin film after molding in a female mold. it can.

Alternatively, as in the invention according to claim 2, the paper is heated at a temperature of at least about 80 to 190 degrees for a time of not less than 80 seconds and not more than 30 minutes while maintaining the molding state when the male mold and the female mold are molded. The same applies when a container is used.
In these cases, the resin film is a paper container made of a polyethylene film as in the invention according to claim 3, the paper film container made of a polypropylene film as in the invention according to claim 4, or claim 5. A paper container in which the resin film is made of a polyester film may be used as in the invention according to the invention.

In particular, as in the invention according to claim 6, it is optimal that the polyester film is a paper container made of a polyethylene terephthalate film.
Particularly in these cases, the paper container in which the resin film has a thickness of about 3 μ to 30 μ and the paper has a thickness of about 20 g / square meter to 200 g / square meter as in the invention according to claim 7 is the most. It can form a convenient container.
Further, in these, the paper container may be a baking container as in the invention according to the eighth aspect, or the steaming container as in the invention according to the ninth aspect.

Further, even a paper container made of a cylindrical container including an ellipse as in the invention according to claim 10, is a paper that is a triangular, quadrilateral or polygonal container having corners as in the invention according to claim 11. The paper container may be a paper container with a hook as in the invention according to claim 12.
Further, as in the invention according to claim 13, silicon may be applied or laminated on at least a part of the front and back surfaces of a film obtained by laminating a stretched resin film and paper.
Further, as in the invention according to claim 14, the heating time after molding in the male mold and the female mold may be heated for 5 minutes to 30 minutes.

Alternatively, as in the invention according to claim 15, instead of the temperature of about 80 to 190 degrees, the heating may be performed at a temperature exceeding 190 degrees.
Furthermore, this is the same for the case of maintaining the temperature of about 80 ° C. to 190 ° C. in the heat retaining state instead of heating as in the invention according to claim 16, and in place of heating as in the invention according to claim 17. What maintains a temperature exceeding 190 degree | times in a heat retention state may be used.
Or like the invention which concerns on Claim 18, a heating or heat retention state may exceed 30 minutes.
In addition to these, it has a step of laminating a stretched resin film and paper as in the invention according to claim 19, and a step of molding the laminated film into a paper container using a male mold and a female mold, The desired paper container can be manufactured by using a method for manufacturing a paper container having a step of heating at 80 ° C. to 190 ° C. for 80 seconds or more after molding, at a temperature equal to or lower than the melting point of the stretched resin film. .

In this case, as in the invention according to claim 20, the step of heating at a temperature of 80 to 190 degrees after molding for 80 seconds or more after molding is performed at a temperature of 80 to 190 degrees after molding at a temperature of 80 seconds or more. It may be a step of maintaining.
Alternatively, even if the step of heating at a temperature of 80 to 190 degrees as in the invention according to claim 21 uses a step of heating at a temperature exceeding 190 degrees, the step of heating as in the invention according to claim 22 is performed. A method for manufacturing a paper container, in which the step of maintaining the temperature in the heat retaining state for 80 seconds or more at a temperature of from about 180 degrees to 190 degrees may be used.

Since it comprises as mentioned above, while being able to manufacture a very useful container by heat resistance and a hygiene aspect first, this invention can provide a paper container with especially high shape retention property.
In particular, according to the first aspect of the present invention, the shape of the resin film is increased by heating the molded paper container at a constant temperature for a certain period of time, and an extremely strong paper container can be manufactured.
In particular, since it is solidified by crystallization or solidification, deformation of the standing wall portion and the like can be prevented, and a container that can be used in various fields can be manufactured.
In this case, the resin layer can be crystallized or solidified similarly by the invention according to claim 2 and also by heating while maintaining the molding state at the time of molding the paper container, so that a very strong container can be molded. And

In this case, the film may be a polyethylene film as shown in claim 3, a polypropylene film as shown in claim 4, or a polyester film as shown in claim 5. Particularly, polyethylene terephthalate is used as shown in claim 6. Is optimal.
As described above, it can be produced using various thermoplastic resin films, and is an extremely broad invention with high utility value.
That is, until now, there are some which are heated at the time of molding and molded with this, or exceptionally heated for a very short time.
This is an extremely short time in terms of temperature, for example, heating for about 10 seconds to 20 seconds, but at that time, it is almost the same as the heating during molding, and neither crystallization nor solidification occurs. .

Therefore, the resin layer is solidified or solidified only after crystallization depending on the material, and it is possible to determine the strength. To form a substantially strong container, In order to produce firmness at least 80 seconds or more, preferably 2 minutes or more after heating / pressure molding, it is necessary to heat for about 5 minutes or more, or to be in a heated atmosphere.
In addition, oil stains can be prevented by using a polyester film or polyethylene terephthalate.
The invention according to claim 7 is used for a resin film and a paper material that match the material of the most convenient paper container, and enables molding of containers that can be required to be extremely diverse and strong.

Conventionally, a paper container using a material having such a thickness has been widely used. However, the container is inevitably lacking in strength and easily deforms the wall portion. However, although it is a paper container according to the present invention, it is extremely strong. It is possible to provide a solidified container.
Therefore, by using it as a baking container as in the invention according to claim 8, it is possible to provide a paper container that does not lose its shape.
In particular, even if bread or confectionery seeds that swell during baking are used, the container can be prevented from being deformed, and a baked state with good appearance can be created.
Further, as in the invention according to claim 9, it can be used for a steaming container and can prevent deformation of the container due to moisture during steaming, and can create a steamed state with a good appearance.

Furthermore, it can be used for a cylindrical container including an ellipse as in the invention according to claim 10, as well as for a participation meter having a corner and a rectangular or polygonal container as in the invention according to claim 11. The wall or bottom of the container is prevented from being deformed, and can be used while maintaining a predetermined shape.
Furthermore, as in the invention according to claim 12, it can also be used for a container with a hook, and can eliminate the covering of the hook part, that is, the spread, and can form a substantially vertical wall-like wall part firmly. This makes it possible to provide a good-looking paper container.
As a result, it can be used as a paper container with a basket for confectionery such as chocolate. For example, when a seed such as chocolate is placed in the container, it is easily and inexpensively loaded without using a mold for preventing the spread of the basket. Will be able to.
Furthermore, chocolate confectionery and the like having a good finish can be provided.

Or it can also be used as a baking or steaming container of bread, baked confectionery, or a steaming container as a container with a bowl.
Especially in these cases, since the deformation of the spear part will occur, the baking or steaming that has been put in a metal mold etc. in the metal mold etc. at the time of firing or steaming without using a special mold will be performed. It will be something that can be done.
Furthermore, it can be used as a paper container with a candy that looks good even when it is baked or steamed, and can be sold as it is.
For example, it can be baked and steamed without using a mold, eliminating the need to use a mold, placing a paper container in the mold, and cleaning, etc., making it possible to manufacture efficiently and inexpensively without much hassle. It becomes.

Next, according to the thirteenth aspect of the present invention, silicon may be applied or laminated, and can be easily removed when the paper containers are stacked one by one.
That is, such paper containers are used for storing and transporting other quantities in piles, and are used by removing them one by one from this stacked state at the time of use.
Therefore, the paper container according to the present invention which is not easily deformed when the container is removed is particularly difficult to remove.
Therefore, it can be easily removed by applying or laminating silicon to at least a part.
In addition, when silicon is applied or laminated as in the invention according to claim 14, it takes time due to the solidification due to the influence of the silicon. For example, slight solidification is possible even in about 80 seconds. However, it is desirable that heating is performed for about 5 minutes to 30 minutes as the optimum, and even if it has silicon due to such a structure, it is solidified or crystallized into a strong paper container It is.

According to the fifteenth aspect of the present invention, heating may be performed at a temperature exceeding 190 degrees.
This is based on the premise that the paper material will not be burnt in relation to the paper material, but it is premised on about 180 degrees or less. For example, when using high-quality paper, cardboard, etc. If there is no problem, heating at a temperature exceeding 190 degrees does not cause a problem as a product, and the resin layer hardens even at a temperature exceeding 190 degrees, and the resin layer solidifies or crystallizes depending on the material. It becomes hardened by curing, and heating at a high temperature in particular enables curing in a shorter time.

Next, in the invention according to claim 16, in place of heating, a temperature of about 80 to 180 degrees may be maintained in a heat retaining condition, and this is also maintained in a constant temperature atmosphere. The temperature of the paper container itself can be increased, and the resin layer can be solidified or crystallized depending on the material and hardened by curing. is there.
In particular, the heating device may be used to maintain the temperature after adding a certain temperature, or the heating device itself may be maintained and the heating state during molding can be maintained to maintain a constant temperature. Particularly, it is desirable to have a heat insulation facility, but at least it can be sufficiently cured and firmly molded even under heat insulation conditions.

Furthermore, since it is not necessary to maintain the special heating state, the heating cost can be reduced.
Next, according to the invention of claim 17, the temperature may be maintained at a temperature exceeding 190 degrees under the temperature maintaining condition, and even in such a state, the resin layer is hardened and solidified or depends on the material. Crystallizes and becomes strong.
In particular, since the heat is not often kept in a heated state under heat-retaining conditions, the heat-retaining state may be obtained after heating at a temperature exceeding 190 degrees at a time, and the heating cost can be reduced.
Next, according to the invention of claim 18, heating or heat retention may be performed for 30 minutes or more, and long-time heating / heat retention causes stronger hardening of the resin layer and can promote solidification and crystallization. It will be a thing.

Of course, the most appropriate temperature time can be spent on heating or keeping warm depending on the paper material or thickness material of the resin layer, etc., and wide and appropriate heating and keeping warm by enabling 30 minutes or more. It can be used as selectable.
According to the nineteenth aspect of the invention, by using such a process, the shape retention of the resin film of the molded paper container can be enhanced, and an extremely strong paper container can be manufactured.
In particular, since the resin layer is strengthened by crystallization or solidification, deformation of the standing wall portion can be prevented, and a container that can be used in various fields can be manufactured.
According to the twentieth aspect of the present invention, it is sufficient that the temperature is maintained under the heat retaining condition rather than maintaining the further heating state, and it is sufficient if the temperature is maintained under the heat retaining condition without maintaining the further heating state. Therefore, it is possible to reduce costs and simplify facilities.

Of course, it is possible to produce a paper container of the same quality by this method.
Further, according to the invention of claim 21, it is possible to use heat retention under a heat retention condition at a temperature exceeding 190 degrees by heating at a temperature exceeding 190 degrees or as in the invention according to claim 22.
Therefore, even at a temperature exceeding 180 ° C., the resin layer hardens tightly and solidifies or crystallizes depending on the material to become strong, and heating at a high temperature enables solidification in a shorter time.

The figure which shows an example of the manufacturing process of the paper container which concerns on this invention The figure which shows an example of the lamination sheet of the paper container which concerns on this invention The figure which shows an example of the manufacturing process of the paper container which concerns on this invention The figure which shows an example of the paper container concerning this invention The figure which shows an example of the manufacturing process of the paper container which concerns on this invention The figure which shows an example of the paper container concerning this invention The figure which shows an example of the paper container concerning this invention The figure which shows an example of the use condition of the paper container which concerns on this invention The figure which shows an example of the paper containers concerning this invention The figure which shows an example of the folding state of the corner | angular part of the paper container which concerns on this invention The figure which shows an example of the paper container concerning this invention The figure which shows an example of the folding state of the corner | angular part of the paper container which concerns on this invention The figure which shows an example of the paper container concerning this invention

First, as shown in FIG. 1, the basic structure of the paper container according to the present invention is such that a stretched resin film 2 such as a polypropylene film, a polyethylene film, or a polyester film is laminated on a paper material 1 such as pure white paper, and the sheet base is used. A container with a hook is manufactured by pressurizing with a molding machine of a male mold 4 and a female mold 3.
A polyester film, for example, a polyethylene terephthalate (PET) film is laminated on a paper material such as pure white paper.
In this case, it is of course possible to perform heating for molding as well as pressurization.
This pressurization and heating are pressurization and heating for a very short time during molding.
In this case, the layer positioned on the inner surface of the paper container may be the resin film 2 or the outer surface may be the resin film layer.
What is necessary is just to comprise an appropriate lamination | stacking state according to a use.

For example, by using polyethylene terephthalate as the inner layer, it is possible to provide a paper container that is easy to use for food.
Furthermore, the paper material 1 may be pure white paper, glassine paper or craft paper.
In addition, the resin film may be formed as a paper material and a multilayer film, either by lamination, coating, or adhesion by an adhesive.
For example, a heat welding film such as another film, for example, a polyethylene (PE) film, or the like may be interposed between the two.
Therefore, in addition to the film laminated, a laminated film is formed by applying a resin such as polyethylene terephthalate to form a laminated film.

In this case, the stretched resin film 2 only needs to be in the form of a film at the lamination stage, and is applicable if it is laminated in a film or sheet form.
Of course, it may be in the form of a sheet as well as a film.
Therefore, a laminated state may be created by applying polypropylene, polyethylene or the like in addition to laminating films.
Not only this two-layer lamination, but also other welding films or other films for other uses such as gas leakage, liquid leakage or frictional resistance reduction, Of course, it is also possible to use a multilayer laminated film in which other resin films or sheets are laminated.

Furthermore, with respect to the stretched resin film, biaxial stretching is optimal, but a uniaxially stretched film may be used.
In the configuration of this figure, as an example of a paper container, it is a paper container with a hook and is a diagram showing an example of a cylindrical configuration.
In this specification, it is a concept including a sheet material to clearly indicate as a resin film, and further, a resin formed into a film or sheet by forming a laminated material by applying a resin material to a paper material. It is clearly indicated as a resin film.

FIG. 2 shows a conceptual diagram of a sheet base to be sandwiched between the male mold 4 and the female mold 3 before molding.
The container is molded by being pressed between the male mold 4 and the female mold 3 in a pressurized state.
Thus, it shape | molds by inserting | pinching between both and applying a pressure.
Of course, it may be formed by heating as well as pressurization.
For example, in the configuration shown in FIG. 1, a paper container with a hook is formed by this heating and pressurization.

FIG. 3 shows a plate-shaped material formed by sandwiching a paper 1 and a resin film 2 such as a polyethylene terephthalate resin film between a male mold 4 and a female mold 3 and pressurizing, and further heating as necessary. An example of the state which is shape | molded in the container shape is shown.
Of course, a polyethylene film or a polypropylene film may be used.
In this way, the resin film 2 on the sheet base is molded exactly together with the molding.
Furthermore, as shown in FIG. 4, an example of the paper container after shaping | molding is shown.
In this state, that is, after heating, the resin layer is solidified by heating at a constant temperature for a certain period of time after the molding, or by maintaining the temperature at this temperature.
The film layer is crystallized or solidified, and in the configuration shown in FIG.

Or even if it is a normal container, it becomes what can be shape | molded firmly in each position, such as a bottom face, a side surface, or a wall surface, and provision of the paper container which cannot be deform | transformed easily can be aimed at.
For example, the shape molded by the molding machine can be maintained by heating for at least 80 seconds or more in a state heated to about 80 to 180 degrees.
For example, when a thin paper material and polyethylene terephthalate are used, the container is solidified by heating at about 185 degrees for about 2 to 5 minutes.
Of course, when a thick sheet material is used for a thicker paper material, the best solidification state can be provided by further correcting the temperature and time.
Further, it can be solidified sufficiently by extending the time even at a lower temperature, and can be appropriately used depending on the material and the situation.

In addition, the solidified state also makes it difficult to cover at least the jar of the container with a jar as shown in FIG. The state can be achieved as long as it is heated to at least about 80 to 190 degrees and heated for at least 80 seconds.
In this case, in relation to time, it may be heated for at least 80 seconds or more, or it may be heated for about 30 minutes, or it may be kept as it is and heated for a longer time.
At least the time that the material itself can withstand use can create a solidified state even when heated.
Accordingly, an appropriate time is within 30 minutes, but this time is not excluded if necessary, but may be exceeded.

In addition, it is optimal to remove the mold from the mold and heat it. However, it is of course possible to maintain the temperature state for a certain period of time in the mold.
This also makes it possible to solidify a paper container made of a laminated film.
Further, regarding the temperature, the upper limit is not limited to 190 degrees, and the temperature may be exceeded.
For example, any temperature such as 195 degrees, 200 degrees, or 210 degrees may be used.
Of course, thin paper or the like may be burnt, and when the temperature is high, the paper itself will be burnt. If possible, a clean paper state is optimal without being burned.

However, when high-quality paper, cardboard, or the like is used, the paper can be neatly molded without scorching even at 190 degrees or more.
Further, depending on the purpose of use, some burns have nothing to do with the value as a product.
Therefore, it is of course possible to heat at a high temperature exceeding 190 degrees.
As a guideline, about 190 degrees or more and about 220 degrees or less is optimal for use at high temperatures.
Naturally, the paper can be maintained as paper, and furthermore, the allowable range is high enough that the resin material does not deteriorate at high temperature. If this can be maintained, a high temperature exceeding 220 degrees may be used.

Any material that can be heated or kept at least at a temperature below the melting point of the polyester film may be used.
In these cases, in the case of a polyethylene film or a polypropylene film, the melting point is lower, but any temperature may be used as long as it is a temperature below the respective melting point and heated or kept at a temperature of 80 ° C. or more.
Of course, depending on each of these films, heating or heat retention exceeding the melting point is assumed.

In addition, in the case of a polyester film, for example, it may be heated to 190 ° C. or more for a short time, and gradually lowered from there.
This also applies to the case of 190 degrees or less, and it is of course possible that the temperature is once increased to about 80 to 190 degrees and then gradually lowered.
Accordingly, a temperature exceeding 190 ° C., for example, a high temperature of about 191 ° C. to 220 ° C. and then maintaining the heat-retaining state as a low temperature, or an arbitrary high temperature such as 250 ° C. exceeding 220 ° C., which is below the melting point of the film. After heating for a short time, the resin layer of the paper container is cured substantially by applying heat to a temperature lower than this, for example, 80 to 190 degrees or the ambient temperature or a lower temperature. It may be hardened as it is solidified or crystallized.

Further, when heating at 80 ° C. to 190 ° C. or over 190 ° C., it is sufficient that the paper container can be kept in a heat-retaining state in addition to continuously heating the paper container at such a temperature. A paper container should be placed in the atmosphere.
Therefore, it may not necessarily be in the heated state, but may be in the heat retaining state, or may be kept in the heat retaining state or in the heated state at a changing temperature.
In addition, although 80 degree | times is shown as a low temperature state, this shows the low temperature lower limit grade, for example at the time of gradually changing from high temperature to low temperature, and does not mean excluding what makes it 80 degrees or less over time. .
As an example of at least a heat retaining state, it is suggested that heat is applied in a heat retaining or heating atmosphere of about 80 degrees or more.

Therefore, for example, when a stretched polyester film (polyethylene terephthalate film) is used, a temperature limit of about 120 to 160 degrees is optimal as the limit of the low temperature of the heated state for obtaining a cured state accompanying solidification or crystallization of the resin layer. For example, if heating of paper such as paper is not taken into consideration, heating at a temperature exceeding 160 degrees, for example, 160 to 190 degrees or exceeding 190 degrees and about 200 degrees is optimal.
Next, the thickness of the paper 1 may be the thickness of paper generally used for a paper bottled container. For example, it is optimal to use a paper having a thickness of about 20 g / square meter to 200 g / square meter.
Of course, a thinner paper material or a thicker paper material may be used.
Especially for thin paper materials, the heating temperature should be about 170 ° C or less in consideration of scorching etc., but it is higher for paper containers that do not cause a problem even when scorching occurs or thick paper with excellent heat resistance. It may be used in.

Next, the thickness of the resin film 2 may also be about 3 to 30 μm, and it is not limited to these thicknesses as long as it has a necessary thickness. .
As described above, the optimum temperature for the heating is, for example, about 120 to 200 degrees when a stretched polyester film (polyethylene terephthalate film) is used, and about 120 to 160 degrees is optimal.
Next, the optimum heat retention time after heating is about 2 to 10 minutes.
In the relationship between the thin paper and the thin film that are frequently used, the above time can be sufficiently solidified.
On the other hand, when a polyethylene film or a polypropylene film is used, for example, about 80 to 110 degrees is optimal because the melting point becomes lower.

However, this time is appropriately determined according to the thickness of the paper 1 and the film base 2 and is not limited to the above time, and may be a shorter time or a longer time. Good.
Alternatively, heating or heat retention by a method such as gradually lowering the temperature to about room temperature over time after heating may be used.
For example, a 12 μm resin film is bonded to 70 g / square meter paper with another adhesive member to form a laminated film, and this is a male cup 4 having a cup size of 90 mm in diameter and 30 mm in height of the standing wall. By pressure-molding with the female mold 3, and further taking out the paper container from the state and heating it at 140 degrees for about 2 minutes, a container having a ridge with the wall portion upright at a substantially right angle was obtained.
Similarly, when the container was heated at temperatures of 150 ° and 160 °, an optimal container was obtained.
On the other hand, when heated at 170 degrees, some scorching occurred on the paper.

Next, a 12 μm resin film is adhered to 70 g / square meter paper with another adhesive member to form a laminated film, and this is a male type with a cup size of 90 mm in diameter and 30 mm in height of the standing wall. 4 and a female mold 3 are pressed, and then a paper container is taken out from the state and heated at 130 degrees for about 4 minutes to obtain a container having a ridge with the wall portion standing up at a substantially right angle. It was.
When heated at 110 degrees and 120 degrees for 4 minutes, the heel part was slightly opened.
Furthermore, when heated at 140 degrees and 150 degrees for 4 minutes respectively, an optimum container having a ridge with the wall portion standing in a substantially right angle state was obtained.
When this was heated at 160 ° C. for 4 minutes, some charring occurred.
This wall has the same configuration as the upright wall obtained by normal short-time heating and pressing, but the wall can be kept strong and the wall will open. Can be prevented and a stable state can be maintained.

On the other hand, the wall part in an upright state obtained only by a general short-time heating and pressing process is such that the wall opens with a little force, and the shape of the container is unstable and easily deformed. Met.
In this way, the entire paper container, i.e., the resin material is solidified or cured, and the standing wall portion resin is also cured, and the standing state can be maintained at a high strength by keeping the heated state or the heat retaining state for a certain time after molding. A stable container can be provided, which is an extremely innovative and useful invention.
Therefore, the shape is maintained with extremely high strength with respect to maintaining this state, and there is no deformation even if a seed that is a moisture-containing material is added. The baked confectionery and bread were baked while maintaining the state.

In this case, the paper container is hardened and hardened, but this is because the hardened state of the resin layer is due to solidification, and depending on the resin, the resin layer is hardened by being crystallized or close to the crystalline state. There are also.
In the present invention, it does not specify whether it is substantially solidified or whether it is crystallized, but at least determines what the resin layer is cured and becomes strong, and is limited to a theoretical configuration. It is not something.
Examples of the relationship between time and temperature are shown below.
For example, when heated at 160 degrees for about 20 seconds to 30 seconds, the heel portion that was initially in an upright state was opened by its own weight, and the upright state could not be maintained.
That is, the shape is maintained in a state where the opening angle is larger than the opening angle of the mold.

Next, heating was carried out at 160 degrees for about 45 seconds, so that the shape was maintained in a state of being opened from the opening angle of the mold.
Therefore, it became possible to maintain the mold opening angle substantially by heating at least about 80 seconds.
FIG. 5 is a diagram illustrating an example of a usage state, and is a diagram illustrating an example of a molding stage of a container having a wall with an upright shape. For example, a male mold 4 and a female mold 3 are formed using a sheet of 10 sheets. It is a figure which shows an example of the state which heat-press-forms by.
By constructing as shown in this figure, a large number of containers can be manufactured at a time.
Therefore, a solidified or hardened paper container can be obtained by applying a constant temperature for a certain period of time after molding.

FIG. 6 shows, for example, ten stacked paper containers formed in this way.
In this case, the ten stacked paper containers may be heated or kept warm for an arbitrary time of at least 80 seconds or more while being heated to about 80 to 200 degrees after the main molding.
This also makes it possible to solidify or cure exactly.
Of course, it is also possible to heat and heat after removing the stacked state one by one.
As for heating or heat retention at a constant temperature after molding for a certain period of time, it is optimal to perform it immediately after molding, but it may be heated and kept warm for some time.
Crystallization, solidification, or curing can be promoted by keeping the temperature constant for a certain period of time following the heating and pressurization at the time of molding.

A silicon resin may be applied to one or both of the outer surface and the inner surface.
Moreover, you may apply | coat to the specific location of one surface.
In other words, a silicon film or a laminated film obtained by further laminating or applying a silicon sheet to the laminated film of the resin film and the paper material 1 may be formed. They may be provided on any one side or only on a part of one side.
Of course, silicon may be applied after molding.
In the above-described stacked state or the like, it takes time to remove this, and it can be easily removed by applying silicon.

In particular, when silicon is applied, it is optimal that the heating and heat retention at a constant temperature for a certain time is a little longer in consideration of silicon application.
Of course, the temperature may be slightly higher.
For example, by heating or keeping warm at about 160 to 190 degrees for about 10 to 20 minutes, a tightly solidified or cured paper container can be formed.
FIG. 7 is an example of a state in which the positions of the stacked paper containers are removed, and silicon is included in a part thereof.
For example, silicon may be applied to the front surface of the inner surface, or silicon may be applied to all or part of the wall portion.
This figure shows an example in which silicon 21 is applied to the outer surface of the resin film 2 on the inner wall portion of the container.

FIG. 8 is a diagram showing an example of a state in which the baked confectionery 5 is placed in the paper container with a basket of the present invention.
In addition, although demonstrated on the assumption of the container for baking and the container for steaming, the paper container which concerns on this invention is not restricted to this, What is necessary is just a paper container for accommodating a foodstuff.
For example, it may be used as a container for chocolate or the like.
Although a container with a jar will be described in particular, it can be used as a paper container that is beautifully shaped and retained without spreading the cocoon portion of this container even when chocolate is added.
FIG. 9 is a diagram illustrating an example of a paper container having another shape.
The configuration shown in this figure shows an example of a cylindrical paper container in which the diameter of the opening is slightly larger than the diameter of the bottom.

This paper container can also be formed by molding with a male mold and a female mold, and the side peripheral surface portion is wrinkled at the time of molding, but it is made into a cylindrical shape by applying pressure as it is. It has a peripheral surface.
For example, it is manufactured using a thin paper material, but by adopting the configuration of the present invention, the paper container itself increases in strength and can be used as a paper container that is not easily deformed even if contents are put in. .
For example, it can be handled in the same way as using a very thick paper material, and can express the usability and softness of a thin paper container.
This can be easily manufactured at a lower cost and can provide a paper container having a good appearance.

In particular, when a thick paper material is used, molding with a male mold and a female mold is extremely difficult, so that the present invention makes it possible to produce a very effective paper container.
The cylindrical container shown in this figure is an example, and may be an ellipsoidal cylindrical paper container, a paper container having various special shapes based on a cylindrical shape, or an opening and a bottom. Of course, they may be used for cylindrical paper containers having various shapes such as the same or different diameters.
FIG. 10 is a diagram illustrating an example of a rectangular paper container having a corner portion.
As shown in this figure, for example, it is an example of a paper container in which the corners of the container are folded into a square shape by male and female molds, and a paper container having corners is molded by folding this fold. is there.

The configuration shown in this figure is a diagram showing that the folded portion 6 is formed at the corner portion and is folded by the folded portion 6, and the folded portion 6 is firmly attached to the box as shown in FIG. It can be solidified in a state of being attached to the side surface and formed into a box shape.
Regarding the folding box as a normal paper container, the corner folds open, so it is only used as a form of packaging, and a firmly strong paper box can be used with adhesive members, connectors, etc. It is constructed with strength.
Therefore, the molding takes cost and time.
On the other hand, since the paper box according to the present invention has strength even when the folded portion 6 is folded, the folded portion 6 is pressed by a male mold and a female mold, for example, and is molded for a certain time after molding. The resin layer is solidified by heating at a temperature or by maintaining the temperature at this temperature, so that the molded state can be maintained firmly.

Accordingly, the folded state can be maintained, and a paper container having corner portions having strength can be provided.
This figure shows a box with four corners. However, the present invention is not limited to this and is used for a paper container having three corners or a polygonal shape of pentagon, hexagon or more. There may be.
Furthermore, a specially shaped paper box having a special shape, that is, a circular arc portion and a corner portion, basically has a cylindrical portion, and corresponds to a paper container having a cylindrical shape.
Accordingly, even a container having a cylindrical shape may be a container having a necessary folding portion, and not only the folded portion but also solidification of a cylindrical shape is possible.
Next, FIG. 12 is a diagram showing another example of a paper container having a plurality of folding parts 6 at the corners, which is an example in which the folding parts 6 are formed by a plurality of folding parts, as further shown in FIG. Further, by forming the folded portion 6 in close contact with the side surface of the box body, that is, solidifying it, a clean box body can be provided.

DESCRIPTION OF SYMBOLS 1 Paper 2 Resin film 21 Silicon 3 Female type 4 Male type 5 Baked confectionery 6 Folding part

Claims

A paper container for forming a film in which at least a resin film 2 and paper 1 are laminated by using a male mold 4 and a female mold 3,
The resin film consists of a stretched resin film,
A paper container which is heated for at least 80 seconds to 30 minutes at a temperature of at least about 80 to 190 degrees which is equal to or lower than the melting point of the stretched resin film after molding by the male mold 4 and the female mold 3.
2. The heating according to claim 1, wherein heating is performed at a temperature of at least about 80 to 190 degrees for a time of not less than 80 seconds and not more than 30 minutes while maintaining the molding state when the male mold 4 and the female mold 3 are molded. Paper container.
The paper container according to claim 1, wherein the resin film 2 is made of a polyethylene film.
The paper container according to claim 1, wherein the resin film 2 is made of a polypropylene film.
The paper container according to claim 1, wherein the resin film 2 is made of a polyester film.
The paper container according to claim 1, wherein the polyester film 2 is a polyethylene terephthalate film.
The paper according to any one of claims 1 to 6, wherein the resin film 2 has a thickness of about 3 µ to 30 µ, and the paper 1 has a thickness of about 20 g / square meter to 200 g / square meter. Made container.
The paper container according to any one of claims 1 to 7, wherein the paper container is a baking container.
The paper container according to any one of claims 1 to 7, wherein the paper container is a steaming container.
The paper container according to any one of claims 1 to 9, wherein the paper container is a cylindrical container including an ellipse.
The paper container according to any one of claims 1 to 9, wherein the paper container is a triangular, quadrangular or polygonal container having a corner.
The paper container according to any one of claims 1 to 11, wherein the paper container is a paper container with a hook.
The paper container according to any one of claims 1 to 12, wherein silicon is applied or laminated on at least a part of the front and back surfaces of the film in which the resin film 2 and the paper 1 are laminated.
The paper container according to claim 13, wherein the heating time after molding in the male mold 4 and the female mold 3 is heated for 5 minutes to 30 minutes.
The paper container according to any one of claims 1, 2, 5 to 12, wherein the paper container is heated at a temperature exceeding 190 degrees instead of a temperature of about 80 degrees to 190 degrees.
The paper container according to any one of claims 1 to 14, wherein a temperature of about 80 to 190 degrees is maintained in a heat retaining state instead of heating.
The paper container according to any one of claims 1, 2, 5 to 12, wherein a temperature exceeding 190 degrees is maintained in a heat retaining state instead of heating.
The paper container according to any one of claims 1 to 17, wherein the heated or heat-retaining state exceeds 30 minutes.
A step of laminating the stretched resin film 2 and the paper 1;
Forming the laminated film into a paper container using the male mold 4 and the female mold 3;
A method for producing a paper container, comprising: a step of heating at 80 ° C. to 190 ° C. for 80 seconds or more after molding at a temperature equal to or lower than the melting point of the laminated film.
The step of heating for 80 seconds or more at a temperature of 80 to 190 degrees after molding is a process for maintaining the temperature in a heat-retaining state for 80 seconds or more at a temperature of 80 to 190 degrees after molding. 19. A method for producing a paper container according to 19.
20. The method for manufacturing a paper container according to claim 19, wherein the step of heating at a temperature of 80 to 190 degrees is a step of heating at a temperature exceeding 190 degrees.
21. The paper container according to claim 20, wherein the step of maintaining the temperature in the heat insulation state for 80 seconds or more at a temperature of 80 to 190 degrees is a step of maintaining the temperature in a heat insulation state exceeding 190 degrees. Production method.