JP2521804Y2 - Filter paper cup - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application field] The present invention relates to a filter paper cup for putting coffee beans or the like powder and pouring hot water over the powder to extract a coffee liquid or the like. .

[Prior Art] Conventionally, as a simple means for extracting a coffee liquid or the like from a powder of coffee or the like, one using a filter paper cup 11 as shown in FIG. 6 is known. The paper cup 11 for filtration is provided with a bottom paper 13 made of filter paper at the bottom of a body paper 12 and is formed by a so-called paper cup machine in the same manner as a normal paper cup. As shown in FIG. 7, the bonding state between the bottom paper 13 and the bottom paper 13 is such that the upright portion 14 of the bottom paper 13 is sandwiched between bent portions formed at the lower end of the body paper 12.

As a method for manufacturing such a filter paper cup 11, there are the following two typical methods.

The steps of the first manufacturing method are shown in FIGS.
This will be described with reference to FIG. First, after the bottom paper 13 made of filter paper is punched out, as shown in FIG. 8 (a), a diaphragm located between the lower male mold 15 and the upper male mold 16 having the inner surface shape of the cup is formed. This bottom paper 13 is put on a predetermined position on the female mold 17 and then, as shown in FIG. 8 (b), the bottom male 13 is lowered to draw the bottom paper 13 and The upright portion 14 is formed and is transferred onto the male mold 15 to be held by suction. Subsequently, as shown in FIG.
The body paper 12 wound in a cylindrical shape is put on the male mold 15 on which the bottom paper 13 is placed, and further, as shown in FIGS. 8 (d) to (f), a heating step of the bottom adhesive portion 18, Curling process of the bottom adhesive part 18,
The bottom is molded through each step of the bottom tightening step by the eccentric roller 19 and the ring 20, and the filter paper cup 11 is formed.

Next, a second manufacturing method will be described with reference to FIGS. 9 (a) and 9 (b). First, the bottom paper 13 is suction-held by the male mold 15 as shown in FIG. 9 (a) through the same drawing step as in FIGS. 8 (a) and 8 (b). Next, receiving the supply of the body paper 12, winding is performed by a pair of semi-cylindrical female molds 21 and 22 that match the male mold 15 in consideration of the paper thickness. In this case, the female mold 21 and the female mold 22 are closed in this order in the figure. After winding the body paper 12, as shown in FIG. 9 (b), both ends of the body paper 12 are heat-sealed with a trowel 23 from between the closed female molds 21 and 22 to form a cylindrical body. Complete. Thereafter, the bottom is molded in the same manner as in FIGS. 8 (d) to 8 (f).

[Problem to be Solved by the Invention] In the first method described above, after drawing the bottom paper 13 in the step shown in FIG. 8 (b), the bottom paper 13 made of filter paper is returned to the original flat state. The upright portion 14 is opened because of the tendency to be entangled, and in the subsequent step of FIG. 8 (c), the upright portion 14 rubs against the inner surface of the body paper 12 while the body paper 12 is To cover. In this case, since the bottom paper 13 is very soft and has low rigidity as compared with the bottom paper of a general paper cup, the upright portion 14 is pulled in the opposite direction due to the rubbing with the body paper 12, so that the so-called square I is easily generated. Then, when the sharpening I occurs in the upright portion 14, as shown in FIGS. 10 (a) and 10 (b),
However, there is a problem that a defective product is formed in which a part is bent in the opposite direction.

Further, in the second method, the upright portion 14 of the bottom paper 13 is open due to the tendency to return to its original position when the female dies 21 and 22 are closed. The leading end of the paper 12 bites a part of the upright portion 14 as shown in FIG.
The protruding portion II is easily generated. Then, when the bottom is formed as it is, as shown in FIGS. 10 (a) and 10 (b),
Further, there is a problem that a defective product having a fold III as shown in FIG. 12 is produced.

The present invention has been made to solve the above-described problems, and has an object to provide a filter paper cup that can stably produce a paper cup with no curls or folds even if a low-rigidity filter paper is used as a base paper. Is what you do.

[Means for Solving the Problems] In order to achieve the above object, a filter paper cup according to the present invention comprises a body paper having an adhesive resin coated on an inner surface thereof, and an upright peripheral portion formed by the adhesive resin. In a filter paper cup formed of filter paper bottom paper adhered to the bottom inner surface of the body paper, the length of the rising portion of the bottom paper, the upright tip that opens immediately after drawing the bottom paper, It is characterized in that the dimensions are such that it does not come into contact with the extended surface of the tapered surface in the male mold having a cup inner surface shape covered by the body paper.

[Operation] The above-described filter paper cup of the present invention is produced without generating a curl or a fold on the rising portion of the bottom paper. That is,
Since the upright portion that opens immediately after the bottom paper is drawn is short, in the subsequent covering step of the body paper of the first manufacturing method,
The leading edge of the upright portion does not contact the inner surface of the body paper, so that no force is exerted on the upstanding portion to cause sharpness. Alternatively, in the wrapping process of the body paper in the second manufacturing method, the upright portion is not bitten by the leading end of the body paper, so that the upright portion does not have sharpness or folds.

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

FIG. 1 is a partial cross-sectional view of a filter paper cup as one embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view of a main part in FIG.

As shown in FIG. 1, the filter paper cup 1 is composed of a body paper 2 and a bottom paper 3. The body paper 2 is made of cup base paper used for a normal paper cup, and the inner surface thereof is coated with polyethylene as an adhesive resin. The bottom paper 3 is made of filter paper slightly larger than the horizontal cross-sectional shape at the bottom of the body paper 2, and the slightly larger portion is the bottom paper 3.
Is adhered to the inner surface of the body paper 2 as an upright portion 4 around the periphery of the body paper 2. As shown in FIG. 2, the upright portion 4 of the bottom paper 3 is shorter than the conventional one shown in FIG. The paper 2 is adhered to the inner surface of the paper 2 by fusion of polyethylene.
That is, the length of the upright portion 4 is set so that the tip of the upright portion 4 that opens immediately after drawing the base paper 3 does not contact the extended surface of the tapered surface in the male mold having the inner shape of the cup covered by the body paper 2. It is set.

Next, the length of the upright portion 4 of the bottom paper 3 will be described. FIG. 3 shows a state immediately after the punched base paper 3 is drawn and placed on the male mold 5. Here, in order to avoid contact between the upright portion 4 of the bottom paper 3 and the body paper 2, as shown in FIG. 4, the bottom paper 3 is drawn with a drawing diameter b ′ which is considerably smaller than the diameter a of the head of the male mold 5. It is also conceivable to squeeze, but in the bottom tightening step shown in FIG. 5, the eccentric roller 6 is pushed from the inside so as to bond the bottom paper 3. Then, the bottom sheet 3 is pulled, and the bottom sheet 3 is easily cut at a corner portion, which is not preferable. From this point, the size of the squeezing diameter b of the bottom paper 3 cannot be made too small, and the diameter a of the head of the male mold 5 in the case of a normal paper cup size.
S (s = (ab) / 2) between the diameter and the aperture diameter b is 1 to 1.5 mm
It is desirable to be within. When the base paper 3 of the conventional size as shown in FIG. 7 is drawn and transferred onto the male mold 5 with the drawing diameter b satisfying such conditions, the base paper 3 made of filter paper is Although the leading end of the upright portion 4 is squeezed so as not to come into contact with the body paper 2, the upright portion 4 opens up to the opening diameter c because of the returning action due to the nature after drawing. And
As shown in FIGS. 10 (a) and 10 (b), when the body paper 2 is covered from above in this state as in the first manufacturing method, the leading end of the upright portion 4 contacts the inner surface of the body paper 2. This may cause Mekure I. Alternatively, when the body paper 2 is covered by the female molds 21 and 22 from the periphery thereof as in the second manufacturing method, the end of the body paper 2 may bite the upright portion 4. Therefore, in the present invention, the length d of the upright portion 4 in the conventional bottom paper 3 is reduced to a length e not in contact with the extension surface M of the tapered surface of the male mold 5. In this way, when the body paper 2 is covered in the first manufacturing method, the leading end of the upright portion 4 does not contact the inner surface of the body paper 2 and the upright portion 4 is attached to the upright portion 4 in FIGS. 10 (a) and 10 (b).
Does not occur. Also, the second
Also in the manufacturing method of (1), when the body paper 2 is wound, the protruding portion II of the upright portion 4 as shown in FIG. 11 does not occur, so that the crevices I and the folds III as shown in FIG. There is no. The length e of the upright portion 4 is appropriately selected depending on the taper of the cup, the rigidity of the filter paper, and the shape retention.

 Hereinafter, specific examples will be described.

In the case where filter paper (meter basis material 50 g / m ² , thickness 0.12 mm) obtained by mixing pulp and polyolefin resin is used as the base paper 3, the opening angle R of the base paper 3 after drawing is 20 to 25. °. And the taper angle T of the male mold 5 is 6 °,
When the difference s between the diameter a of the head and the stop diameter b is 1.5 mm and the length d of the upright portion 4 of the bottom paper 3 is 6 mm, the upright portion 4 spreads beyond the extension of the tapered surface. , The length e of the upright portion is 3
By reducing the thickness to 44 mm, that is, 〜 to / 3 of the conventional one, contact with the body paper could be avoided, and the formation of the bottom I and the fold III did not occur.

In the above-described embodiment, a cup having a round cross section has been described. However, the filter paper cup of the present invention is not limited to a round cross section and may be a square cup or the like. Things.

[Effects of the Invention] Since the present invention is configured as described above, it is possible to reduce the size of the base paper without changing the molding process of the conventional filter paper cup, and to raise the filter paper with low rigidity. It is possible to stably produce a filter paper cup having no burrs or folds in the part.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a filter paper cup as one embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view of a dotted line portion in FIG. 1, and FIG. FIG. 4 is a cross-sectional view showing a state in which the drawing board is on the upper side, FIG. 4 is a cross-sectional view showing a case where the drawing diameter is small, FIG. FIG. 7 is a partially enlarged sectional view of the bottom of a conventional filter paper cup, and FIGS. 8 (a) to (f) show a first method of manufacturing the filter paper cup. FIGS. 9A and 9B are process diagrams showing a part of the second manufacturing method;
FIG. 10 (a) is a perspective view of a bottom portion of a filtration cup in which the bottom paper has a round surface, FIG. 10 (b) is a cross-sectional view of the same, and FIG. 11 is winding of the body paper in the second manufacturing method. FIG. 12 is a partially cutaway perspective view of a conventional example showing a state in the middle of winding the body paper in the second manufacturing method, showing a state in the middle. 1 ... filtering cup, 2 ... body paper, 3 ... bottom paper, 4 ...
Standing part, 5 ... male type, 6 ... Eccentric roller, 11 ... Filter paper cup, 12 ... Body paper, 13 ... Bottom paper, 14 ... Standing part,
15… Male type, 16… Male aperture type, 17… Female aperture type, 18 ……
Bottom adhesive part, 19 ... Eccentric roller, 20 ... Ring, 21, 22
... female type, 23 ... iron, I ... Meckle, II ... protruding part, III ... fold, a ... male head diameter, b, b '... bottom paper drawing diameter, c …… Opening diameter of bottom paper, d, e …… Length of standing part, s… Difference between diameter of male head and drawing diameter (s = (a−
b) / 2), M: Extension surface of male taper surface, T: Male taper angle, R: Open angle of bottom paper

Claims (1)

(57) [Scope of request for utility model registration] 1. A body paper having an inner surface coated with an adhesive resin,
The length of the upright portion of the bottom paper is defined as the length of the upright portion of the bottom paper, in a filter paper cup formed by the surrounding upright portion and a bottom paper made of filter paper formed by bonding the inner surface of the bottom of the body paper with the adhesive resin. A filter paper cup characterized in that an end of an upright portion that opens immediately after drawing processing does not touch an extended surface of a tapered surface of a male mold having a cup inner surface shape covered by a body paper.