JPH11255230A - Paper cup for heat-processed cake - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a paper cup for heat-processed cake free from fine wrinkles formed at its sticking part by a method wherein a sticking film made of polyethylene telephthalate film is used as a sticking medium that sticks the internal face of a turn-up part at the side plate of the paper cup to the external face of the side plate. SOLUTION: A bottom plate demarcated with upward-looking creases approximately in a circular shape is formed concentrically to a circular paper, to which a polyethylene telephthalate laminate layer is stuck to its face becoming the internal face of a cup, and a number of radially-shaped inward-looking creases 15 and outward-looking creases 16, each slightly inclined against each of the creases 15, are respectively formed at the outside thereof, and a side plate having alternately long, narrow wedgelike turn-up parts 17 and long, trapezoidal unit side plate parts 18, each demarcated and formed by each of the creases 15 and 16, is bent and raised at the upward-looking creases.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper cup for heat-treated confectionery such as steamed confectionery and baked confectionery, and more particularly to a paper cup having excellent shape retention during heating of confectionery dough and having a side plate bonding portion of the paper cup. Paper cups that do not produce fine lines.

[0002]

2. Description of the Related Art A paper cup of this kind and a method of manufacturing the same are disclosed in, for example, Japanese Patent Application Laid-Open No.
There is one described in Japanese Patent No. 26548. According to this conventional technique, a thin paper sheet is cut into a disc shape, a circular fold is formed on the disc body by a creasing machine, and an inward fold and an outer fold are formed between the fold and the outer edge of the disc body. Directional folds are formed radially at predetermined pitches, and outwardly folded folds are outwardly bent, inward folds and circular folds are bent inwardly to side plate components, and an adhesive is formed on the outer surfaces of the folded portions. And a method of manufacturing the paper cup in which the folded portion is adhered to the outside of the side plate constituting portion after attaching with a gluing machine.

[0003]

According to the above-mentioned prior art, the glue or adhesive for bonding the folded inner surface to the outer surface of the side plate necessary for shape keeping of the paper cup side plate is made of polyvinyl alcohol which is harmless to food hygiene. Since the use of a rewetting adhesive such as (PVA) or dextrin or starch paste is inevitable, the range of use as a paper cup is greatly restricted. It cannot be used as a steamed confectionery paper cup to be put together with the dough and then sold after heating.

That is, the pressure caused by the thermal expansion of the steamed confectionery dough in the steaming pot causes the P
Strongly added to the side plate adhesive portion of VA, dextrin or starch paste, these adhesive portions are peeled off and spread in a dish shape, and the confectionery dough spills out of the paper cup. There was an essential and serious problem that rabbits could be used as temporary disposable drinking cups, and they could not be used as steamed confectionery cups.

[0005] Furthermore, since the above-mentioned paste such as the re-wet adhesive or the starch paste needs to be attached to water at the time of adhesion and dried in a shape-retained state, it takes much time and effort to manufacture paper cups. In addition to the poor properties, the paper swells due to the moisture in the paper cup bonding part, and after drying, the paper cups result in "fine wrinkles", which is an essential and serious problem that it cannot be used for cosmetic paper cases and paper cups for over-the-counter sales . Further, since the heated confectionery sticks to the inner surface of the paper cup, it is necessary to previously form a silicone resin coat layer on the inner surface of the paper cup.

In order to eliminate the above-mentioned problems, the present invention is strong against a high-temperature and high-humidity atmosphere and is suitable for a living body as an adhesive medium between an inner surface of a side plate folded portion and an outer surface of the side plate, which is necessary for standing and maintaining a paper cup side plate. By using a harmless polyethylene terephthalate film laminate film with good surface releasability, it is possible to obtain a heat-treated confectionery paper cup such as steamed confectionery or baked confectionery without causing "fine wrinkles" in the side plate bonding portion. I do.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to form a paper cup in which a paper leaf is folded from a number of folds to form a cup-shaped paper cup.
A bottom plate divided by a substantially circular upward fold is formed concentrically on a circular paper on which a laminate layer (hereinafter simply referred to as a PET laminating layer) of a polyethylene terephthalate film, which is a raw material of an ET bottle, is adhered. A number of radial inward folds and outward folds slightly inclined to one side are formed for each of these folds, and an elongated wedge-shaped folded portion and an elongated trapezoidal unit side plate portion defined by these folds are formed. Folding the side plates having alternately from the upward fold, and folding the folded portions along the outside of each unit side plate portion,
By heating and pressing the PET lami layer adhered to the inner surface of each folded portion to the inner PET lami layer of the unit side plate portion and attaching the PET lami layers to each other, the side plate is raised from the upward fold, and the shape is retained. It was achieved by doing.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, as shown in FIGS. 2 and 5, a basic form of the present invention is to use glassine paper or kraft paper as a paper cup raw material 10, and to use a corona paper on the inner surface of the cup and a corona paper on the outer surface. A so-called "PET lami paper" is used in which a laminate layer P of a well-known externally activated PET film having improved adhesion and adhesion of a printing ink by a discharge treatment or the like is applied by a known means. A concentric substantially circular fold 12 is formed at the center of a circular paper 11 obtained by punching the material 10 into a circular shape.
To form a bottom plate 13 partitioned by
A plurality of radially inward folds 15, 15 are provided between the outer edge 14 of the circular paper 11 and the outer edge 14 of the circular sheet 11 so that the extension extends through the center of the disk body 11 and divides the outer edge 14.

Then, each of these inward folds 15, 1
5 at a position of the substantially circular fold 12, and a plurality of outward folds 16, 16 are formed by inclining at predetermined angles with respect to the inward folds 15, 15;
Each of the inward folds 15, 15 and the outward fold 1
As shown in FIGS. 2 and 3, side plates 19 having elongated wedge-shaped folded portions 17 and elongated trapezoidal unit side plate portions 18 formed alternately as shown in FIGS.

Next, the elongated wedge-shaped folded portion 1
7 and 17 are attached to the outside of the unit side plate portion 18 and are erected from the upward fold 12, and the PET lamination layer P inside the inside surface of each of the folded portions 17 and 17 and the PET lamination layer P on the inside surface of the unit side plate portions 18. At the same time, as shown in FIG.
The temperature of the laminating layer P is rapidly raised to about 350 ° C. to 400 ° C.,
Immediately after heating for about 0.5 to 1 second, the PET lamination layers are pressed together with a roller R, and the PET lamination layers P can be stuck together by cooling and solidifying immediately after melting. The side plate 19 thus formed can be integrally formed upright with the bottom plate 13.

That is, a wedge-shaped folded portion 17 and a substantially trapezoidal unit side plate portion 18 divided by an inward fold 15 and an outward fold 16 are alternately bonded and connected to each other by the PET lami layers P and the bottom plate. 13 and the paper cup could be integrally formed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The above-mentioned circular paper 11 is made from a thin PET laminating raw material paper such as glassine paper or kraft paper by punching to produce a fixed-size circular paper 11 shown in FIG. As shown in FIGS. 2 and 3, the unit side plate portion 18 and the folded portion 17 are substantially perpendicular to the inward fold 15, the outward fold 16, and the circular upward fold 12, as shown in FIGS. Bending and creasing are performed using a plurality of types of molds that gradually become deeper, but can be simplified when the paper cup is dish-shaped.

In order to form a PET lamination layer P on the paper surface, P
The ET film is applied to paper using the well-known "dry laminating method", that is, using a dry laminating adhesive for repairing punctures of tire tubes, etc., or using a polyethylene coating previously applied to the paper surface as a heat adhesive adhesive. Then, the PET laminating layer P could be applied to the paper surface by a well-known heating and pressing means.

Next, a specific example in which the outer surface of the unit side plate portion 18 and the inner side of the outer surface of the folded portion 17 are welded by the PET lamination layers P will be described. As shown in FIG. 1, the paper cup work-in-progress 1 is inserted into the female former F matching the outer surface of the paper cup with the bottom plate 13 facing down, and is placed and positioned. While rotating
The flame a of the flame radiator A such as a small gas burner is carefully radiated between the inner PET lami layer P of the side plate folded portion 17 and the inner PET lami layer P of the unit side plate portion 18, and each of these P
Immediately after the ET lamination layer P is heated to about 350 to 400 ° C. rapidly and for a short time (about 0.5 to 1 second) and melted, the pressing roller R successively strongly presses the former F side one after another to make the above described. The molten PET lamination layers are melt-pressed and then solidified by cooling, so that the inner surfaces of the folded portions 17 can be firmly welded to the inner surfaces of the side plates by the PET lamination layers P as shown in FIG. It was possible to start up and keep the shape in one without the occurrence of cracks.

Further, in order to improve the adhesiveness of the PET lami layers by melting and press-compression cooling and solidification, the film surface immediately after the formation of the PET film is exposed to a known "corona discharge" as described in JP-B-31-9411. PET with high adhesion by increasing the surface activity by directly applying the accompanying high voltage distortion
Use a film.

[0016]

As described above, the present invention has the following advantages. A bottom plate 13 is formed concentrically on a circular paper 11 on which a PET lami layer P is applied on the inner surface of the cup and divided by a substantially circular upward fold 12, and a number of radial inward folds 15 are formed outside the bottom plate 13.
And outward folds 16 slightly inclined to one side with respect to these folds 15, respectively.
5 and 16, side plates 19 having alternately elongated wedge-shaped folded portions 17 and elongated trapezoidal unit side plate portions 18 are respectively turned up from the upward folds 12, and the folded portions 17 are respectively formed by the unit side plate portions 18. The PET lami layer P harmless to the living body attached to the inner surface of each folded portion 17 is folded along the outside, and the unit side plate portion 18
By heat-melt compression bonding to the PET lami layer P on the inner surface, and then solidifying by cooling and welding the PET lami layers P to each other, it is possible to obtain a strong adhesive force to a high-temperature and high-humidity atmosphere.
From the upward folds 12 in the high-temperature steam, and could be kept in shape.

Also, since the side plate bonding portion of the paper cup according to the present invention does not require moisture, there is also a second effect that a beautiful paper cup without swelling of the paper and without "fine wrinkles" can be obtained. Furthermore, PE adhered to the inner surface of the paper cup
Due to the surface lubricity of the T-laminate layer P, there is also a third effect that the heated confectionery is easily peeled off from the paper cup and is easily taken out and eaten.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of bonding a side plate of a paper cup according to the present invention.

FIG. 2 is a perspective view of the paper cup material creased.

FIG. 3 is a perspective view of a paper cup in-process product;

FIG. 4 is a perspective view of a finished product of a paper cup according to the present invention.

FIG. 5 is a development view of a paper cup material according to the present invention.

FIG. 6 is an enlarged sectional view of an example of bonding a side plate of a paper cup according to the present invention.

[Explanation of symbols]

Reference Signs List 11 circular paper 12 upward fold 13 bottom plate 15 inward fold 16 outward fold 17 folded portion 18 unit side plate portion 19 side plate P laminated layer of PET (polyethylene terephthalate film)

Claims (1)

[Claims] 1. A paper cup in which a paper leaf is folded from a number of folds and kept in a cup shape, wherein a laminated layer P (hereinafter simply referred to as a PET laminate) of a polyethylene terephthalate film having an improved adhesiveness on the inner surface of the cup. A plurality of radially inward folds 15 are formed on the outer side of the bottom plate 13 which is concentrically defined by upward folds 12 on the circular paper 11 on which the folds 15 are attached. Outward fold 16 slightly inclined
And side plates 19 alternately having elongated wedge-shaped folded portions 17 and elongated trapezoidal unit side plate portions 18 defined by these folds 15 and 16, respectively. The PET which is folded back along the outer side of the unit side plate portion 18 and is attached to the inner surface of each folded portion 17
A heat-treated confectionery paper cup in which the side plate 19 is raised from the upward fold 12 and shaped by heating and pressing the laminating layer P onto the inner PET laminating layer P of the unit side plate portion 18.