JP2006021819A - Flat type tea bag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flat type tea bag which enables an efficient performance of short-time extraction from tea leaves. <P>SOLUTION: The flat type tea bag comprises: a bag body with a rectangular plane form, having, in the center portion in the longitudinal direction of a rectangular water permeable sheet, a bent side folded along a line perpendicular to the longitudinal direction being made one side, a seal-bonded line formed along the sheet end portion at the side opposite to the bent side being made one side, a bonded side made by fusion-bonding the side edges in the longitudinal direction of the sheet being made one side, and the remaining one side opposite to the bonded side being made an opening; tea leaves charged inside the bag body through the opening; a fusion-bonding line formed for closing the opening of the bag body after it is filled with the tea leaves; and a hanging thread whose one end is bonded to an area in the vicinity of an intersection of the diagonals on one of the surfaces of the bag body. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a flat tea bag, and more particularly to a tea bag in which a hanging thread is bonded to the vicinity of the center of one side of the tea bag.

  A tea bag with a hanging thread with a tag filled with tea leaves such as green tea, oolong tea and black tea is soaked in hot water poured into the container and extracted by shaking up and down to extract the contents in a short time. It is common to make it. The main shape of the tea bag is a flat front and back dihedron or a three-dimensional tetrahedron.

  The front and back dihedral flat tea bags have a small space for containing the extraction raw material, and if the tea leaves absorb water and expand during extraction, the tea leaves are pressed by the front and back dihedrons, resulting in poor water permeability. There were problems such as insufficient extraction effect. Patent Document 1 also describes a flat tea bag with improved extraction efficiency.

On the other hand, since the tetrahedral tea bag has a large space for accommodating tea leaves, the water permeability during extraction is good, the raw materials can be stirred, and the extraction can be performed efficiently in a short time. However, since the tea bag has a three-dimensional structure, there is a problem that the packaging material to be packaged becomes large and takes up space. Furthermore, there are problems such as inconveniences when the exterior packaging is performed in the automatic packaging process.
JP-A-8-98770

  In view of the above problems, an object of the present invention is to provide a flat tea bag that can efficiently extract tea leaves in a short time.

  In order to achieve the above object, the present invention provides a flat tea bag, which is a bent side that is bent along a line perpendicular to the longitudinal direction at a central portion in the longitudinal direction of a rectangular water-permeable sheet. 1 side, the sealing line formed along the edge of the sheet at the side opposite to the bent side as one side, and one side of the adhesive side heat-sealed by aligning the longitudinal side edges of the sheet And a bag having a rectangular planar shape with the remaining one side facing the adhesive side as an opening, a tea leaf filled into the bag from the opening, and a bag filled with the tea leaf There is provided a flat tea bag comprising: a heat-sealing line formed to close the opening of the bag; and a hanging thread having one end bonded to the intersection of diagonal lines on one side of the bag.

  Furthermore, when the tea leaves are placed with the sealing line up, the dry tea leaves are included in the range of 1/6 to 1/2 of the height inside the tea bag, or in the wet tea leaves It is included in the range of 1/5 to 9/10 of the height inside the tea bag, and when the tea bag is immersed in water, it is shaken up and down with a hanging thread, so that the thickness of the tea bag is increased. Provided is a tea bag capable of extending in a range of 1 to 5 times the width.

  According to the present invention, one side of a flat tea bag is a bent side, and a hanging thread is bonded to the vicinity of the center of the tea bag so that when immersed in water, the inside of the tea bag is moved up and down with the hanging thread. It can be extended greatly. As a result, a tea bag from which tea leaves are efficiently extracted in a short time can be provided.

  Hereinafter, the present invention will be described in detail.

  As shown in FIG. 1, the tea bag of the present invention includes a bag body 1 formed of a water-permeable sheet, tea leaves 3 filled in the bag body 1, and after filling the tea leaves 3, A heat-sealing wire 19 that closes the opening 7 and a hanging thread 13 bonded to the bag body 1 are provided.

  For example, the bag 1 formed from a water-permeable sheet has a rectangular shape and has an opening 7 that is open until it is closed by a heat-sealing wire 19. One side facing the opening 7 is an adhesive side 11 to which the water-permeable sheet is heat-sealed. Of the two sides adjacent to the opening 7, one side is a bent side 9 formed by bending, and thus this side is not bonded. The side opposite to the bent side 9 is bonded by a sealing line 5 formed along the end of the sheet.

  In the bag body 1 having such a rectangular planar shape, for example, a water-permeable sheet having a rectangular shape is bent along a line perpendicular to the longitudinal direction at the center in the longitudinal direction to form a bent side 9. It can be produced by forming the sealing line 5 on the opposite side and bonding it, and by thermally fusing one of the side edges in the longitudinal direction of the sheet to form the bonding side 11.

  For continuous production, for example, a rectangular long water-permeable sheet is folded along the long axis direction, and then the opposite sides are bonded along the long axis direction. It may be produced by cutting at the bonding location while adhering linearly in the short axis direction with a predetermined interval.

  The tea leaves 3 included in the bag 1 are components that can be used as tea leaves such as green tea, oolong tea, black tea, brown rice, buckwheat, and barley, and herbs for herbal tea (healthy tea). Any one can be used as long as it can be extracted and drunk, or a mixture thereof.

  As the water-permeable sheet used for the bag body 1, mesh, nonwoven fabric, woven fabric, knitted fabric, etc. that have water permeability and can be heat-sealed are used. These include polyester, polylactic acid, nylon, polypropylene, rayon, and the like. It is preferable to be formed from synthetic fibers. Moreover, it can form also from the synthetic fiber containing a vegetable fiber.

  The means for heat-sealing the side edges of the sheet, the means for forming the heat-sealing wire 19 and the sealing wire 5 may be a general heat seal or ultrasonic seal, but the extraction area of the tea leaves 3 is more The width of the fused portion is preferably narrow so as to increase.

  The sealing wire 5 is formed by heat-sealing water-permeable sheets forming both surfaces of the bag 1 using the above-described heat-sealing means. The sealing line 5 may be formed as a straight line along the end of the sheet, or may be formed by continuously arranging minute lines.

  The tea leaves 3 are filled into the bag body 1 from the opening 7. The opening 7 is closed by a heat-sealing line 19 formed along the opening 7 after the tea leaves 3 are filled.

  The bag body 1 further has a hanging thread 13 having one end bonded to substantially the center of one side thereof. Here, “substantially central” means a rectangular diagonal intersection 17 formed from the sealing line 5 and the bent side 9, the adhesive side 11, and the heat fusion line 19, and preferably the intersection 17. Represents the inside of a circle with a diameter of 3.0 cm centered at. This intersection 17 and its periphery are referred to as the vicinity of the intersection in this specification. One end of the hanging thread 13 is bonded in the vicinity of this intersection. For adhesion, the heat fusion means may be used as described above. The hanging thread 13 is preferably formed from polypropylene or the like.

  In FIG. 1, when the bent side 9 is in front and the opening 7 of the bag body 1 is in the left hand, the hanging thread 13 is bonded to the upper surface, but the hanging thread 13 is bonded to the lower surface under the same conditions. May be adhered.

  The hanging thread 13 may optionally have a tag 15 attached to the other end. The tag 15 may be formed from paper, resin, or the like, for example, a rectangular shape. The hanging thread 13 and the tag 15 may be bonded using heat fusion.

  When the tea bag of the present invention having the above shape is immersed in water, the space inside the tea bag can be greatly extended by swinging the hanging thread 13 up and down. As shown in the schematic diagram of FIG. 2, when the tea leaf 3 absorbs water and expands to increase the weight and the hanging thread 13 is pulled, the tea bag is deformed from a flat shape to a diamond shape. On the other hand, when the hanging thread 13 is lowered, the surface located on the lower side of the tea bag becomes parallel to the water surface and strongly receives the resistance of the water and tries to return to the flat shape again. Such elongation deformation of the tea bag is maximally performed by bonding the hanging thread 13 near the intersection of the surface of the bag body 1.

  In addition, immersing the tea bag in water can be used not only for hot water but also for extraction with cold water. The elongation deformation of the tea bag as described above is performed in the same manner even when immersed in hot water or cold water.

  Furthermore, the tea bag of the present invention has a structure in which only three sides of the bag body 1 are bonded and the remaining one side is formed by bending the sheet. Since the non-bonded side opens to a larger angle than the bonded side, the presence of the non-bonded side allows the tea bag to extend more smoothly.

  For example, in the case of a tea bag in which all four sides are bonded, the edge of the tea bag after extraction is slightly V-shaped, but in the case of a side that is not bonded, it is U-shaped. Therefore, the tea bag of the present invention can be extended more than a structure in which all four sides are bonded.

  When the tea bag is repeatedly extended greatly, the inflow and outflow of hot water inside and outside the tea bag is promoted, and the tea leaves are forcibly stirred. This makes it possible to efficiently extract the tea leaf components in a short time.

  However, when the amount of tea leaves contained in the tea bag is too large, the inside of the tea bag is filled with tea leaves 3, and the tea bag may not be able to expand and contract greatly. Therefore, the amount of the tea leaves 3 included in the tea bag of the present invention is dry with respect to the height inside the tea bag when the sealing line 5 is turned up, that is, the height from the bent side 9 to the sealing line 5. It is preferably included in the range of 1/6 to 1/2 in the tea leaves in the state, or included in the range of 1/5 to 9/10 in the tea leaves in the wet state.

  Here, the wet tea leaves are tea leaves that have been leached by immersing the tea bag in hot water of, for example, 80 ° C. and 150 cc for 30 seconds and moving up and down 10 times.

  When the amount of tea leaves 3 included is within the above range, the tea bag can be expanded and contracted in hot water, and the width in the thickness direction of the tea bag, that is, between the surfaces. Can be extended in the range of 1 to 5 times.

  The hanging thread 13 may be attached to the tea bag at an arbitrary time, but is preferably attached before the tea leaves 3 are filled. The hanging thread 13 may be stretched from the bonded surface to the opposite surface around the bent side 9, and may be fixed, for example, by temporarily fixing the tag 15 to the sheet so that it can be easily removed. By fixing the hanging thread 13 in this way, the sealing of the opening 7 is not hindered, and it can be prevented from being caught even when packaged in an exterior material.

  The tea bag of the present invention may be individually packaged appropriately in an exterior material, and since it has a flat shape, it is thin and compact, and is convenient to carry. Furthermore, since the tea bag of the present invention has a thin flat shape, it is difficult for problems to occur in the packaging procedure for the exterior material, and it is possible to prevent wrinkles of the exterior material.

  Hereinafter, the test of the extraction efficiency of the tea bag of the present invention will be described.

  The change in extraction efficiency due to the difference in the bonding position of the hanging thread was tested.

  A product of the present invention in which a hanging thread was bonded to the center of one side of a tea bag and an existing product in which a hanging thread was bonded to a position 10 mm from the end of one side of the tea bag were prepared. Each tea bag was filled with 1.9 g of tea leaves having a particle size of 18-60.

  Each tea bag was immersed in 150 cc of hot water at about 80 ° C., allowed to stand for 60, 30, or 15 seconds, and shaken up and down 20 times or 10 times to drain the hot water.

In each sample, the extraction concentration (soluble solids (Brix)) and turbidity were measured. For the measurement value, the total value of the first and second cracks was used, and the average value measured three times. The results are shown in Table 1.

  The results shown in Table 1 are shown in FIGS.

  As is apparent from FIGS. 3 and 4, the tea bag of the present invention (the product of the present invention) has a high extraction concentration and a high turbidity even when the amount of tea leaves is the same as that of the existing product, and an excellent extraction effect is obtained. It was. From this, it was shown that the tea leaf extraction efficiency is greatly improved by adhering a hanging thread to the center of the tea bag.

  The extraction efficiency was compared using the tea bag of the present invention in which three sides of the tea bag were bonded and the tea bag in which all four sides were bonded.

When making a tea bag with all four sides bonded, the two sheets are stacked and fused, but the sheet friction is low, so it is slippery and misalignment occurs when stacking, resulting in poor molding. It's easy to do. Since the tea bag of the present invention has a bent side where the sheet is bent, one side is fixed, and a shift is less likely to occur. Therefore, since it is easy to mold, the bent side of the tea bag of the present invention was mechanically fused when producing a four-sided adhesive tea bag. The size and surface area of each produced tea bag were measured, and the theoretical volume was calculated. The results are shown in Table 2.

Each tea bag filled with the same amount of tea leaves was immersed in hot water for 15 seconds and then moved up and down 5 times to measure the extraction concentration (soluble solid content) and turbidity. The results are shown in Table 3. The measured value was expressed by converting the average value of three measurements to 100%.

  As shown in Table 3, the tea bag with only three sides adhered had higher extraction efficiency and higher turbidity than the tea bag with all four sides adhered.

  The extraction efficiency according to the filling amount of tea leaves was tested.

The tea bag of the present invention is filled with dry tea leaves having a particle size of No. 18-60 to 1/6, 1/3, and 1/2 of the inner height when the sealing line of the tea bag is turned up, After being immersed in hot water for 30 seconds, it was moved up and down 10 times. Table 4 shows the results of measuring each extraction concentration and turbidity. Moreover, the height of the tea leaf after extraction was shown with respect to the height inside the tea bag when the sealing line was turned up.

  The results shown in Table 4 are shown in FIGS.

  From the figure, it was shown that the extraction efficiency decreases even when the amount of tea leaves filled is too large. This is presumably because the tea bag is prevented from elongating by too many tea leaves, so that the space inside the tea bag is small and water permeability becomes poor, and the tea leaves cannot be sufficiently stirred. Therefore, in order to effectively use the tea bag of the present invention, it is important to make the filling amount of tea leaves appropriate, and thereby the extraction efficiency of tea leaves can be further increased.

The schematic diagram of the tea bag of this invention. The cross-sectional schematic diagram showing expansion | extension of the tea bag in hot water. The graph which showed the extraction density | concentration by the adhesion position of a hanging thread. The graph which showed the turbidity by the adhesion position of a hanging thread. The graph which showed the extraction density | concentration by the tea leaf filling amount. The graph which showed the turbidity by the amount of tea leaves filled.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Bag body, 3 ... Tea leaf, 5 ... Sealing line, 7 ... Opening part of bag body, 9 ... Bending side, 11 ... Adhesion side, 13 ... Hanging thread, 15 ... Tag, 17 ... Intersection of diagonal line, 19 ... Thermal fusion wire.

Claims (2)

A flat tea bag,
Formed along the sheet edge at the side opposite to the bent side, with the bent side bent along a line perpendicular to the longitudinal direction as one side at the center in the longitudinal direction of the water-permeable sheet having a rectangular shape A rectangular planar shape in which the sealed line is one side, the adhesive side heat-sealed by aligning the side edges in the longitudinal direction of the sheet is one side, and the remaining side opposite the adhesive side is an opening. A bag having
Tea leaves filled into the bag from the opening,
A heat-sealing line formed to close the opening of the bag filled with tea leaves;
On one side of the bag body, a hanging thread having one end bonded near the intersection of diagonal lines;
A flat tea bag. The tea leaves are included in the range of 1/6 to 1/2 of the height inside the tea bag in dry tea leaves when the sealing line is turned up, or the tea leaves in wet tea leaves. Included in the range of 1/5 to 9/10 of the height inside the bag,
2. The tea bag according to claim 1, wherein when the tea bag is immersed in water, the width in the thickness direction of the tea bag extends within a range of 1 to 5 times by shaking up and down with a hanging thread. Tea bag.

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