JP5831861B2 - Packaging bag - Google Patents

Description

  The present invention relates to a packaging bag suitable for packaging microwave heated foods and foods that require draining. More specifically, the present invention relates to a packaging bag in which a hook-and-loop fastener is attached to an opening of the packaging bag and water or steam can be extracted from between engagement elements constituting the hook-and-loop fastener.

  Conventionally, packaging bags having a draining function have been known. For example, Japanese Patent Application Laid-Open No. 2005-324827 describes a pair of male surface fasteners attached to an opening of a bag body. However, this published patent publication does not specifically describe the male surface fastener attached to the opening.

The present inventor made a prototype packaging bag with a conventional general male surface fastener attached, and verified its ease of use. As a result, the general male surface fastener, hook surface fastener and mushroom type When a woven male hook-and-loop fastener having an inflated head is attached to the opening, when the hydrated food filled in the bag is taken out of the bag, the food enters the hook-and-loop fastener, which is the engaging element. It was found that the engaging ability was lowered and the hygiene was not preferable. In addition, it was found that the engagement element dropping phenomenon from the end face and the engagement element dropping due to repeated opening and closing were also observed, which is not preferable for hygiene.
Conversely, it has been found that hook-and-loop fasteners that do not easily allow food and juice to enter the hook-and-loop fastener when putting or removing hydrated foods in the packaging bag generally have a low drainage function and require a long time to drain. .

  Furthermore, as a packaging bag, a well-sealed zipper attached to the opening is also known, but this does not have a draining function and is generated by heating when performing microwave heating. Since steam cannot escape from the inside of the bag, the packaging bag expands and bursts due to an increase in internal pressure. When a zipper with a gap is used instead of a completely sealed zipper, it can be prevented from bursting by heating in a microwave oven, but the gap is not wide enough to be used as a draining bag. It is almost impossible to use.

JP 2005-324827 A

  The present invention is a packaging bag having a draining function, and when the food is taken in and out, the food is less likely to enter the hook-and-loop fastener part attached to the opening and has a sufficient draining function. An object of the present invention is to provide a packaging bag capable of sufficiently releasing steam from the hook-and-loop fastener even when the range heating is performed.

That is, the present invention relates to a packaging bag in which two mushroom type surface fasteners are attached to each other along an opening of a packaging bag made of a synthetic resin sheet. Two or more mushroom-type engaging element rows extending from one end to the other end, each mushroom-type engaging element comprising a stem portion (S) and an umbrella portion (M) extending above the stem portion. The umbrella portion (M) extends out of the stem portion (S) in the direction orthogonal to the combined element row direction (Q direction), but the umbrella portion (M) extends in the engagement element row direction (P direction). The stem portion (S) and the tip of the umbrella portion have substantially the same width, and the width (W) of the stem in the engagement element row direction is adjacent to the engagement element row direction. the ratio between the distance (L) of the coupling element 1: 0.9 to 1: in the range of 0.7, said surface fastener Elastomeric resin is a packaging bag characterized by comprising a thermoplastic resin are blended.

  Preferably, according to the present invention, in the packaging bag, two mushroom type surface fasteners present in the opening are present on the other surface between the engaging element rows present on one surface. This is a case where the engaging element rows are attached so as to be fitted, and the length (X) of the expanding portion of the umbrella portion of the engaging element is the interval between the stem portions of the adjacent engaging element rows. (Y) is narrower and wider than the interval (Z) between the umbrella portions of adjacent engaging element rows, and the stem width (T) in the direction orthogonal to the engaging element row direction is adjacent to the engaging elements. It is a range of 1/2 to 1/1 of the interval (Z) between the umbrella portions of the row. Furthermore, in the present invention, it is preferable that the number of mushroom-type engaging element rows constituting two mushroom-type surface fasteners is 3 to 6 rows.

  According to the packaging bag of the present invention, when taking in and out hydrated food, food, juice, etc. are less likely to enter the hook-and-loop fastener part attached to the opening, and the hook-and-loop function is sufficiently provided. Even when the microwave oven heating is performed with the bag closed, it is possible to sufficiently release the vapor from the hook-and-loop fastener portion.

The front view of a suitable example of the whole packaging bag of this invention. The perspective view of a suitable example of the mushroom type surface fastener which comprises the packaging bag of this invention. The front view of a suitable example of the nozzle for extrusion used in manufacturing the mushroom type surface fastener which comprises the packaging bag of this invention.

A preferred embodiment of the present invention will be described below with reference to FIGS.
FIG. 1 is a front view of an example of the packaging bag of the present invention. In FIG. 1, 1 is the synthetic resin sheet which comprises the trunk | drum of a bag. Reference numeral 2 denotes a portion where the two synthetic resin sheets (the front side sheet and the back side sheet) are heat-sealed and sealed, and both side portions of the bag are sealed. Of course, when the bag is formed of a cylindrical sheet, the heat-sealed portions on both side portions may be unnecessary. Furthermore, it may be bonded by an adhesive instead of heat fusion. And 8 part of the upper end of a bag body is an opening part.

  In the lower part 4 of the bag, the bottom sheet is indicated by a dotted line 9 between the sheets (1) forming the body of the bag so that the bag can be self-supported when hydrated food or the like is filled in the bag. Therefore, in the state where the food is not filled, the folded sheet serving as the bottom part and the two sheets serving as the body part (the front side and the back side) overlapped with the part 4. It has a quadruple structure.

  Then, at the hatched portion of 5, the front side sheet serving as the body and the front side surface of the folded bottom sheet are heat-sealed, and the back side sheet serving as the body and the other side of the bottom sheet Is heat-sealed so that the filling does not leak from the bottom. Accordingly, the heat-sealed portion 6 includes a front-side sheet serving as a body and a front-side surface of the sheet serving as a bottom from the top, and a back-side sheet and bottom serving as a body. Two sheets of the fusion part (b) in which the opposite surface of the sheet to be heat-sealed are superposed. Further, a portion 7 existing in the heat-sealed portion 6 is a portion where the fused portion (a) and the fused portion (b) are all heat-fused and integrated, and has such a structure. As a result, when the packaging bag is filled with food or the like, the bottom portion is widened, and the packaging bag is supported by the heat-sealing portions present on both sides, and thus becomes stable and independent.

  Since such a packaging bag can stably stand by itself and is easy to use when heated in a microwave oven or the like, the length and height of the bottom of the bag without filling with food (the height from the bottom to the hook-and-loop fastener) )) In the range of 1: 0.4 to 1: 2.0, and the height of the bottom folded portion 9 from the bag bottom is 0.15 to 0.35 times the bag bottom side length. 2 to 0.3 times is preferable. The size of the bag is 5 to 30 cm in height and 10 to 30 cm in base length, particularly 10 to 20 cm in height and 15 to 25 cm in base length in terms of ease of use. preferable.

Examples of the synthetic resin that forms the synthetic resin sheet constituting the packaging bag of the present invention include polyolefins represented by polyethylene and polypropylene, nylon resins, polyester resins, polyvinyl chloride resins, polyvinylidene chloride resins, and the like. It is mentioned as a representative example, and cellophane etc. are mentioned further. These may be laminated. Further, a sheet on which aluminum or the like is deposited may be used.
Among these, a sheet made of a polyolefin resin is preferable in terms of heat-fusibility. Further, a nylon or polyester sheet laminated on a polyolefin resin sheet, or an ethylene-vinyl alcohol resin sheet laminated or sandwiched on a polyolefin sheet may be used. As a thickness of the synthetic resin sheet which comprises a packaging bag, 20-200 micrometers, especially 50-150 micrometers are preferable.

  And the hook_and_loop | surface fastener 3 exists in the upper part of a packaging bag along the opening part from the end of an opening part to the end. Of course, the hook-and-loop fastener does not need to be parallel to the bottom surface. For example, when the opening is present obliquely with respect to the bottom surface, the hook-and-loop fastener may also be present obliquely. It is not necessary to make the inclination and the inclination of the hook-and-loop fastener the same. In short, what is necessary is just to attach to the opening part vicinity so that the foodstuff etc. which were filled in the bag can be sealed in a bag.

  As a preferred example of the hook-and-loop fastener for sealing the opening of the packaging bag of the present invention, a male hook-and-loop fastener as shown in FIG. In the male surface fastener of FIG. 2, the engaging elements are erected in a row on the substrate. In FIG. 2, four rows of engaging element rows exist in parallel to the substrate length direction (P direction). And such an engagement element row | line | column exists from the end of an opening part to the end, and specifically, the surface of a bag is in the position of 3 parallel to the opening part 8 of the openable / closable bag shown in FIG. The hook-and-loop fastener attached to the front fuselage sheet and the hook-and-loop fastener attached to the back fuselage sheet are attached to the inside of both the back and back sheets.

  The surface fastener constituting the present invention is composed of a substrate made of a thermoplastic resin and a number of engaging elements made of the same resin. The thickness of the substrate is preferably about 0.1 to 0.5 mm, particularly preferably 0.2 to 0.4 mm, and the width is preferably 3 to 15 mm, particularly 4 to 8 mm. The thickness of the substrate may be uneven in the width direction. In order to improve the uprightness of the stem, the substrate thickness in the stem area (the thickness of the substrate portion where the engaging element row exists on the surface) is the substrate portion where the stem row does not exist, that is, adjacent to the substrate portion. It is preferable to make the thickness slightly larger than the thickness of the substrate between the portions between the stem rows and the ears existing outside the stem rows.

All of the engaging elements are erected in a row on the substrate substantially perpendicularly from the substrate, and each engaging element is associated with the stem portion (S) extending from the root portion (substrate) and the above. When viewed from the element array direction (P direction), the upper part is composed of an umbrella part (M) that spreads over both wings like an umbrella.
In the present invention, each mushroom-type engaging element is composed of a stem portion (S) and an umbrella portion (M) extending above the stem portion (S), and the umbrella portion (M) in a direction perpendicular to the engaging element row direction (Q direction). Is extended from the stem portion (S), but the umbrella portion (M) does not have an extension in the engaging element row direction (P direction), and extends from the stem portion (S) to the tip of the umbrella portion. It has almost the same width (W). By having such an engagement element shape, when food is taken in and out of the bag, it is possible to prevent food from entering the hook-and-loop fastener portion and to prevent the engagement ability from being lowered, Drainage ability and steam escape are improved.

In the present invention, the surface fastener attached to the inside of the top sheet and the surface fastener attached to the inside of the back sheet can be of the same shape, and the engaging element row of one surface fastener is adjacent to the other surface fastener. The double-sided fastener is attached to the inside of the seat by shifting the distance half of the interval between the engagement element rows (distance with the adjacent engagement element rows) in the vertical direction so as to fit between the matching engagement element rows.
As a method of attaching the hook-and-loop fastener to the sheet, heat fusion, that is, a method in which the hook-and-loop fastener is placed on the surface of the sheet, and heat is applied from the sheet surface and crimped is generally used. May be attached to the seat surface.

As the height (H) of the engaging element, a range of 0.5 to 2.0 mm, particularly 1.0 to 1.5 mm is preferable from the viewpoint that the effect of the present invention can be further exhibited. As the length (X) of the expanded portion, a range of 0.4 to 1.4 mm, particularly 0.7 to 1.0 mm is preferable in terms of engagement force, and a stem width (W) is 0.3 to 0. .7 mm, particularly 0.4 to 0.6 mm is preferable. Further, the interval between the stem portions, that is, the interval (Y) between adjacent engaging element rows is preferably in the range of 0.8 to 1.8 mm, particularly 1.0 to 1.6 mm. As an interval (L) between the engaging elements adjacent to each other, a range of 0.2 to 0.6 mm, particularly 0.3 to 0.5 mm is preferable. The stem width (T) in the direction orthogonal to the engaging element row direction is preferably in the range of 0.2 to 0.5 mm, particularly 0.3 to 0.4 mm, and the umbrella between adjacent engaging element rows. The interval (Z) at the part is preferably in the range of 0.3 to 1.2 mm, particularly 0.6 to 0.9 mm. Furthermore, it is preferable that 20 to 50%, particularly 30 to 40% of the height (H) of the engaging element is the umbrella portion.
Satisfying these sizes and ranges is preferable from the viewpoint of engagement force and ease of engagement, and further preventing the filler from entering the surface fastener.

Furthermore, in the present invention, the spreading width (X) of the umbrella portion spreading portion is narrower than the spacing (Y) between the stem portions of the adjacent engaging element rows, and the spacing (Z) between the umbrella portions of the adjacent engaging element rows. A wider one is preferable in terms of engagement force and ease of engagement. Further, the stem portion width (T) is also within a range of 1/2 to 1/1, particularly 2/3 to 3/4, of the interval (Z) between the umbrella portions of adjacent engaging element rows. It is preferable for the same reason. The ratio between the stem width (W) in the engagement element row direction and the interval (L) between the engagement elements adjacent in the engagement element row direction is in the range of 1: 0.9 to 1: 0.7. Used in terms of resultant force and ease of draining.

  Further, in the present invention, the end face of each engaging element in the row direction and the end face of the nearest engaging element existing in the adjacent row are on the same plane, and food and the like are taken in and out of the bag. At this time, it is preferable in that food can be prevented from entering the hook-and-loop fastener and excellent drainage ability can be obtained. In order to make the end surfaces of the engaging elements the same surface, in the manufacturing method described later, when the blades are put into the engaging element rows so as to cross the length direction of the engaging element rows, The mating engagement element rows are also cut on the same surface, that is, the plurality of engagement element rows are cut on the same surface.

  In the present invention, the engaging element is manufactured by a method described later, but the thickness in the engaging element row direction tends to be thicker in the vicinity of the root of the stem than in the middle part of the stem. In such a case, the dimension said by this invention means the length in the intermediate part of the height of a stem part.

Furthermore, in the present invention, it is essential that there are a plurality of mushroom-type engaging element rows constituting the mushroom-type hook-and-loop fastener, among which 2 to 6 rows, particularly 3 to 5 rows are present, It is preferable in terms of engagement force and ease of opening. In the mushroom type surface fastener shown in FIG. 2, there are four engaging element rows, and this number is most preferable.
The dimensions and intervals of the engagement elements described above are average values of 10 values such as arbitrarily selected engagement elements or between engagement elements.

Further, in the surface fastener constituting the present invention, it is preferable that the engaging elements are present at a density of 30 to ²⁰⁰ per 1 cm ^{2 of the} substrate on the substrate, and if the number is less than 30, the engaging force is reduced. On the other hand, when the number is greater than 200, the adjacent engaging elements interfere with each other and a sufficient engaging force cannot be obtained. More preferably, the density is in the range of 50 to 150 / cm ² .

Further, in the surface fastener of the present invention, the cross-sectional area of each stem portion in parallel to the substrate direction in the intermediate portion of the stem portion height of the engaging element is preferably a 0.1 to 0.3 mm ^2. When the cross-sectional area is less than 0.1 mm ² , the engagement element is easily bent and the engagement force is reduced. On the other hand, when it exceeds 0.3 mm ^2, the surface fastener becomes hard, which is not preferable. More preferably in the range of 0.15 to 0.25 mm ^2. The cross section referred to here is a cross section in a plane parallel to the substrate of the stem portion of the engaging element.

Next, the manufacturing method of the surface fastener which comprises this invention is demonstrated.
First, a thermoplastic resin is melt-extruded from a nozzle (10) having a slit as shown in FIG. 3, and a plurality of mushroom-like cross sections that are upright with respect to the substrate and continuous in the length direction are formed on the surface of the substrate. A tape having a plurality of rows is formed.

  In FIG. 3, 11 is a linear slit that will form a substrate, and 12 is a slit that will form a mushroom-type engaging element. When the slit of FIG. 3 is used, a tape in which four mushroom-like rows standing on the substrate surface are present at equal intervals is obtained. As described above, the number of rows is suitably 2 to 6 and preferably 3 to 5. The tape width is preferably 5 to 15 mm before stretching. In addition, it is also possible to manufacture a product tape by using a wider multi-row nozzle and slitting into an appropriate row.

  Examples of the thermoplastic resin used for the hook-and-loop fastener include polyolefin resins, polyester resins, polyamide resins, ethylene-vinyl alcohol copolymers, and particularly stretchability, melt extrusion stability, and further Preferred examples include polyolefin resins typified by polypropylene in terms of fusibility and engaging element strength. It is also preferable to mix resins having different melting points for more efficient heat fusion. In addition, it is preferable to blend an elastomer-based resin so that the umbrella portion of the engagement element is not cut due to the flexibility of the engagement element and the repetition of engagement-peeling. For example, by blending 5 to 50 parts by weight of an olefin elastomer or a styrene elastomer with 100 parts by weight of a polyolefin resin, and forming it, it is possible to obtain an engaging element that is flexible and is not easily cut by an umbrella part.

  Next, cuts are made in the rows existing on the surface of the obtained tape to the vicinity of the roots at small intervals in a direction crossing the row length direction, preferably in a direction perpendicular to the rows. A suitable interval between the cuts is 3 to 8 mm. Next, the tape is stretched in the length direction. The stretching ratio is preferably such that the tape length after stretching is 1.5 to 3.5 times the original tape length. By this stretching, the cuts made in the rows are expanded, and the rows become a row of a large number of independent engaging elements.

  In the hook-and-loop fastener used in the present invention, in order to increase the adhesive strength with the bag body sheet, unevenness may be provided on the back surface of the substrate. For example, when manufacturing the above tape-like extrudate, A strip or a groove may be provided.

In addition, a heat seal portion may be provided on the surface fastener of the packaging bag of the present invention, that is, between the surface fastener and the opening so that the filled food can be stored for a long period of time. Of course, the part above the hook-and-loop fastener may all be heat-sealed up to the opening,
In other words, it can be stored and transported for a long time because it is heat-sealed in a sterilized state, and it can be transported and stored in a state in which the bag is placed sideways or upside down, and when used (for example, food) The heat-sealed part is removed and the bag is closed with a hook-and-loop fastener, and in this state, the bag can be heated without rupturing by heating in a microwave oven or the like, and the food filled in the bag When it is necessary to drain the water when used, the water can be easily removed from the surface fastener gap by inclining the bag in the above state.

  The food packaging bag according to the present invention is a food packaging bag that needs to be drained when storing and taking out food containing water such as pickles and konjac, and is further heated and eaten in a microwave oven. It is suitable as a packaging bag for foods, especially liquid foods, and even if it is heated in a microwave oven while filled in the bag, the generated steam escapes between the hook-and-loop fasteners, so it can be transferred to other containers as before. There is no need to put it in the microwave.

The food packaging bag of the present invention is present on the upper side of the hook-and-loop fastener of the food packaging bag of the present invention when the food packaging bag of the present invention filled with food is displayed at, for example, a convenience store or a food department. The heat-sealed part is heat-sealed, sterilized, and arranged in a state that is conservative, and when the customer purchases the product, the heat-fused part is removed at the store or after the customer brings home, It is suitable for usage forms such as heating in a microwave oven while being sealed with a hook-and-loop fastener.
And the packaging bag of the present invention is reusable because after taking out the filled food etc., there are few food etc. left in the hook-and-loop fastener part and can be easily removed by washing with water It is.

  Hereinafter, the present invention will be described more specifically with reference to examples.

Example 1
A laminated sheet made of a polypropylene sheet and a nylon sheet having a thickness of 90 μm is used as a bag body and a bag bottom, and is a bag similar to the bag shown in FIG. A bag attached to the inside of the bag was prepared so as to face each other. The bag has a width (bottom side length) of 20 cm, and there are 8 mm wide heat-sealed portions on both outer sides thereof. The height of the bag is 13.5 cm, and the folded portion of the sheet forming the bottom of 9 shown in FIG. 1 exists at a height of 5.5 cm from the bottom. The arc-shaped line that fuses the bottom sheet and the fuselage sheet shown in FIG. 1 is a line having a radius of about 12.5 cm, and the lower part is fused from the line. 1 is a semicircle having a diameter of 15 mm centering on both side ends 16 mm above the bottom.

  Further, as the mushroom type surface fastener, a resin in which polypropylene and polyethylene elastomer are mixed at a weight ratio of 90:10 is used, and a melt of the resin is extruded from a nozzle as shown in FIG. A tape having four rows is produced, and cuts are made at intervals of 5 mm so as to have the same cut surface in the direction perpendicular to the tape length direction from the top to the root of the four engaging element rows of the tape, and It was stretched 2.0 times in the tape length direction to obtain a mushroom type surface fastener. In this mushroom type surface fastener, the end face of the nearest engaging element that exists in a row adjacent to the row direction end face of each engaging element exists on the same plane.

The obtained mushroom type surface fastener has four rows of engaging element rows, and the thickness of the substrate is approximately 0.2 mm (the engaging element row portion is 0.35 mm, the portion between the engaging element rows and the ear portion) Is 0.15 mm thick), the engagement element height (H) is 1.3 mm, the interval (L) between adjacent engagement elements in the engagement element row direction is 0.4 mm, and the stem width in the engagement element row direction (W) is 0.5 mm, the stem width (T) in the direction orthogonal to the engagement element row direction is 0.4 mm, the interval (Y) between the stem portions of adjacent engagement element rows is 1.3 mm, and the engagement The length (X) of the expanding portion of the umbrella portion of the element is 0.8 mm, the interval (Z) between the umbrella portions of adjacent engaging element rows is 0.7 mm, and the engaging element density is 74 / cm ^2. It was.
The hook-and-loop fastener attached to the top sheet of the fuselage and the hook-and-loop fastener attached to the back sheet are shifted on the other sheet surface between the engaging element rows existing on one sheet surface by shifting the mounting position. It is attached to the fuselage sheet by heat fusion so that the combined element row is inserted. When attaching the hook-and-loop fastener to the inner surface of the bag, the hook-and-loop fastener was cut to fit the bag width, but at that time, the engagement element was not dropped, and as a result, the engagement element was dropped after forming the bag. There was nothing at all.

When the bag was filled with boiled vegetables, the hook-and-loop fastener portion was closed and heated using a microwave oven, steam escaped from the hook-and-loop fastener engaging portion, and the bag did not rupture. And when this bag was tilted and the simmered vegetables were taken out of the bag, the amount of boiled juice and vegetable pieces sandwiched between the hook-and-loop fasteners was extremely small and did not give an unclean feeling. Similarly, when the bag is filled with simmered konjac, and the hook-and-loop fastener part is closed and drained, only the broth can be easily removed from the bag through the gap between the hook-and-loop fasteners. Yarn konjac was rarely entangled and did not give a sense of filth.
Furthermore, when the bag was soaked in vinegar and filled with vinegar, the hook-and-loop fastener part was closed and drained, and only the vinegar could be easily removed from the bag through the gap between the hook-and-loop fasteners.

Comparative Example 1
In Example 1 above, instead of the mushroom type surface fastener, a woven fastener in which a commercially available hook element and loop element are present on the same surface (the hook element is a polyester monofilament having a height of 1.8 mm and a height of 440 dtex). The loop element is made of polyester multifilament having a height of 2.2 mm and 235 dtex / 10 filaments) and cut into the same size as the above-mentioned mushroom type surface fastener, and a sheet that becomes a fuselage sheet by heat fusion Mounted at the same position as Example 1.
When attaching the hook-and-loop fastener to the inner surface of the bag, the hook-and-loop fastener was cut to fit the bag width. At that time, some of the monofilaments and multifilaments of the engaging element were cut to form a bag. Dropout occurred.

The packaging bag with the hook-and-loop fastener is filled with the boiled vegetable as in the first embodiment, the hook-and-loop fastener portion is closed and heated using the microwave, and the steam escapes from the engaging portion of the hook-and-loop fastener. Never burst. However, when this bag was tilted and the boiled vegetables were taken out of the bag, the hook-and-loop fastener was filled with a lot of broth and vegetable pieces, giving it an unclean feeling. It was weak.
Furthermore, when this bag was filled with boiled konjac, and the hook-and-loop fastener part was closed and drained, only the broth was easily removed from the bag through the gap between the hook-and-loop fasteners. Yarn konjac was entangled in the fastener and entered, giving a sense of filth, and the engaging force was also insufficient.

Comparative Example 2
In the first embodiment, as mushroom-type surface fastener, the engaging element height 1.3mm with an umbrella with a diameter of 600μm with a spread of around 360 ° of the stems on the stem diameter 200μm is 60 / cm ² When a bag was produced in the same manner as in Example 1 using a molded fastener having a width of 6 mm present at a density, the draining ability was not different from that in Example 1, but there was a vegetable piece between the engaging elements. It was entangled and filthy, and it did not provide sufficient engagement force.

DESCRIPTION OF SYMBOLS 1 ... Bag body 2 ... Seal part 3 of bag body ... Mushroom type surface fastener 4 ... Part where sheet which forms bag body overlaps with sheet which forms bottom part 5 ... Bag The fuselage sheet and the bottom sheet overlap and are heat-sealed. 6 ... The bag fuselage sheet and the bottom sheet overlap, and the two heat-sealed parts overlap. 7... 6, where the overlapping portions are further heat-sealed to integrate all of them 8... Bag opening 9... Sheet folding portion 10 forming the bottom 10. ... Linear slits 12 that will form the substrate ... Slits H that will form mushroom-type engagement elements ... Engagement element height L ... Next to the engagement element row direction Interval between engagement elements W ... Stem width S in the engagement element row direction S ... Engagement element Stem portion M: Umbrella portion T of engagement element ... Stem width Y in direction orthogonal to engagement element row direction ... Spacing X between stem portions of adjacent engagement element rows X ... Engagement The length Z of the expanding portion of the umbrella portion of the element ... The interval between the umbrella portions of adjacent engaging element rows

Claims (5)

In a packaging bag in which two mushroom type surface fasteners are attached to each other along an opening of a packaging bag made of a synthetic resin sheet, the two surface fasteners are both from one end of the opening to the other. It has two or more mushroom-type engaging element rows that extend, and each mushroom-type engaging element consists of a stem portion (S) and an umbrella portion (M) that extends above the stem portion, and is orthogonal to the direction of the engaging element row The umbrella part (M) extends out of the stem part (S) in the direction of movement (Q direction), but the umbrella part (M) does not expand in the direction of the engaging element row (P direction). The stem portion (S) to the tip of the umbrella portion have substantially the same width, and the width (W) of the stem in the engagement element row direction and the spacing between adjacent engagement elements in the engagement element row direction (L ) ratio of 1: 0.9 to 1: 0.7 by weight, said surface fastener elastomeric resin Packaging bag, characterized in that a thermoplastic resin which is blended.   The two mushroom type surface fasteners attached to the opening are positioned so that the engaging element rows existing on the other sheet surface are inserted between the engaging element rows existing on one sheet surface. The packaging bag according to claim 1, which is attached.   The length (X) of the expanding portion of the umbrella portion of the engagement element is narrower than the interval (Y) between the stem portions of the adjacent engagement element rows, and the interval (Z) between the umbrella portions of the adjacent engagement element rows The packaging bag according to claim 1 or 2, which is wider.   The stem width (T) in the direction orthogonal to the engaging element row direction is in a range of 1/2 to 1/1 of the interval (Z) between the umbrella portions of adjacent engaging element rows. A packaging bag according to any one of the above. The packaging bag according to any one of claims 1 to 4, wherein the number of mushroom-type engaging element rows constituting the two mushroom-type surface fasteners is 3 to 6 rows.

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