JP2017057008A - Pouch for microwave oven - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pouch for microwave oven, for improving steam releasing performance.SOLUTION: A pouch 100 for microwave oven, having a steam releasing part 140 is such that: the planar shape of the steam releasing part 140 is a flat shape; a portion extending in the longitudinal direction of the steam releasing part 140 is formed in a pouch storage part 130 so as to be parallel to or ±30° or less to a line vertical to a straight line L which connects a center point of a width in the longitudinal direction of the steam releasing part 140, and a center point O of the pouch storage part 130 on a film surface of the pouch; and an unsealed part 150 and a steam releasing seal part 160 are sequentially provided around the steam releasing part 140.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a microwave oven pouch having a steam vent, and more particularly, to improve the steam venting performance without discharging contents, and to suppress thermal damage of the pouch. About.

  2. Description of the Related Art Various types of pouch-stuffed foods that have been filled and sealed in a pouch container and heated at the time of eating have been proposed. When these pouch-stuffed foods are heated in a microwave oven without being opened, the internal pressure of the pouch increases in a short time due to the steam generated from the contents during heating, and the contents are scattered due to bag breakage, dirt in the microwave oven, human body There was a possibility of causing burns. For this reason, in recent years, a technology for providing a steam vent for extracting steam from the inside of the pouch container during heating is generally used for pouches used for microwave ovens (see Patent Documents 1 and 2). . A microwave oven pouch having a steam vent according to these conventional examples will be described with reference to FIGS.

  FIG. 9 is a plan view of a microwave oven pouch according to a conventional example. As shown in the figure, the microwave pouch 200 is concentric with a steam vent 240 having a circular planar shape, an unsealed portion 250, and a steam vent seal 260 in the region where the pouch container 230 is provided. Provided. In the microwave oven pouch 200 configured as described above, the steam release seal portion 260 is expanded due to the expansion of the internal pressure in the pouch housing portion 230 due to the steam generated from the contents when the microwave oven is heated. Is peeled and retracted from the central point O side to the position where the steam vent 240 is provided, and steam is discharged from the pouch housing 230 through the steam vent 240 to the outside.

  However, in such a conventional microwave pouch 200, depending on the type of contents stored in the pouch storage unit 230, the steam filled in the pouch storage unit 230 may be heated from when the microwave oven is heated until after it is taken out. There is a possibility that the steam is exhausted vigorously for a long time, or the contents are caught in the steam exhaust force and ejected from the steam vent 240. In addition, it has been found that if the expanded state of the pouch housing part 230 is maintained for a long time while the contents remain high, there is a risk of thermal damage to the inner surface material of the pouch and perforation of the pouch resulting from the thermal damage. . These problems are considered to be greatly related to the steam discharge mechanism in the microwave oven pouch.

  FIG. 10 is an explanatory view of an increase in the internal pressure of the pouch housing portion 230 in a pouch having a general shape according to a conventional example, and a plan view of the vicinity of the pouch center point O of the microwave oven pouch 200 and the steam release portion 240. The pouch shape is omitted. Further, FIG. 11 is an explanatory diagram of the process of peeling and retreating of the steam vent seal portion 260 according to the conventional example, and shows the vicinity of the steam vent portion 240 provided in the microwave pouch 200 in a plan view. . The arrow F in FIG.10 and FIG.11 has shown the direction of the force of the internal pressure which peels and retracts the vapor removal seal | sticker part 260. FIG.

As shown in FIG. 10, it can be considered that when the pouch is heated, steam is generated from the contents, and a force is applied radially from the center point O of the pouch housing portion 230 (see a plurality of arrows in FIG. 10). For this reason, it can be considered that the direction of the arrow F described above substantially coincides with the direction of the straight line L connecting the center point O of the pouch housing part 230 and the center point of the steam release part 240. Moreover, the dotted line B in FIG. 11 represents the boundary line between the already peeled site and the unseparated site of the steam release seal portion 260 in the conventional example, and the peeling backward indicates the progress of the dotted line B1, the dotted line B2, and the dotted line B3. Then, it reaches the steam vent 240. As described above, in the conventional example, the internal pressure force (in the direction of arrow F) radiating from the center point O of the pouch accommodating portion 230 maintains a linear shape perpendicular to the direction of the arrow F while maintaining the steam vent seal portion 260. It can be seen that the film is peeled back. A small hole is finally formed in the vicinity of the contact point P of the steam release portion 240 when the boundary line of the peeling reaches the tangent line on the center point O side of the pouch housing portion 230 in the periphery of the steam release portion 240 (on the dotted line B3). It is formed (see FIG. 12) and the steam is discharged outside the pouch.

  However, when the discharge of steam at the contact point P of the steam release portion 240 is started, the internal pressure in the pouch housing portion 230 decreases, and a phenomenon occurs in which the separation and retraction of the steam release seal portion 260 stops on the dotted line B3. . For this reason, steam is discharged only at the contact point P in a state where only the center point O side of the pouch housing part 230 is expanded from the dotted line B3, and most of the unsealed parts are located behind the dotted line B3 in FIG. The portion 250 is pressed by the left and right steam vent seal portions 260 and the films remain in close contact with each other, so that the steam is not discharged. Note that FIG. 12 shows that in FIG. 11, when the peeling and retreating of the steam release seal part 260 reaches the tangent to the steam release part 240 on the dotted line B3, the steam release part 240 is moved in the direction of arrow F from the inside of the pouch housing part 230. The state as seen is simply shown. As described above, although the unsealed portion 250 is provided around the vapor vent seal portion 240 as described above, a small hole is formed in the vicinity of the contact P, but the unsealed portion 250 It can be seen that in most cases, the films are in close contact with each other and do not contribute to the formation of holes through which vapor escapes. Therefore, it is considered that the expanded state of the pouch housing part 230 is maintained for a long time due to insufficient steam discharge, and the above-described various problems occur.

  These problems can be solved by increasing the diameter of the steam vent 240. However, it is necessary to increase both the steam vent seals 260, the capacity of the contents is insufficient, the width of the pouch opening at the time of filling. New issues such as narrowing occur.

JP 2003-192042 A Japanese Patent Laying-Open No. 2005-187079

  An object of the present invention is to improve the steam venting performance without discharging the contents, suppress thermal damage of the pouch, and ensure a sufficient amount of contents and an opening width at the time of filling. Is to provide.

According to the present invention,
In a microwave pouch having a steam vent,
The planar shape of the steam vent is a flat shape,
The portion extending in the longitudinal direction of the steam venting portion is on the film surface of the pouch with respect to a line perpendicular to the straight line connecting the center point of the longitudinal width of the steam venting portion and the center point of the pouch accommodating portion. It is formed in the pouch housing part to be parallel or ± 30 ° or less,
An unsealed portion and a steam vent seal portion are sequentially provided around the steam vent portion.

Moreover, in the microwave oven pouch according to the present invention, it is preferable to adopt the following configuration. In this case, if possible, two or more can be used in combination.
1. The unsealed part is provided at the center point side of the pouch housing part at least around the steam vent part,
2. The unsealed part is provided over the entire circumference of the circumference of the steam vent part,
3. The steam vent has a width of 3 mm to 8 mm in the longitudinal direction of the steam vent, a width in the short direction of the steam vent of 1 mm to 3 mm, and a width in the longitudinal direction of the steam vent is short of the steam vent. 1.5 to 8 times the width of the direction,
4). The part where the steam vent part extends in the longitudinal direction on the center point side of the pouch housing part of the steam vent part is a hole shape or a cut shape including a straight line,
5. The part where the steam vent part extends in the longitudinal direction on the central point side of the pouch housing part of the steam vent part is a hole shape or a cut shape including an arc shape,
6.5. The arc-shaped radius of curvature is in the range of 2.5 mm to 32 mm,
7). A steam vent is provided on the corner side of the pouch,
8). A steam vent is provided on the upper side of the pouch,
9. The steam vent is provided between the inscribed circle of the maximum vertical width of the pouch housing portion and the inscribed circle of the maximum horizontal width of the pouch housing portion.

  According to the present invention, it is possible to improve the steam venting performance while suppressing the contents from being discharged from the steam vent. For this reason, the thermal damage of the pouch inner surface material and the punching of the pouch caused by the thermal damage can be suppressed. Moreover, since the planar shape of the steam venting portion is a flat shape, it is possible to suppress the entire steam venting portion and the steam venting seal portion from being enlarged, and it is possible to secure the amount of contents to be stored and the opening width during filling.

It is a top view of the pouch for microwave ovens concerning the embodiment of the present invention. It is a top view of the pouch for microwave ovens which concerns on other embodiment of this invention. In the microwave oven pouch of FIG. 1, it is explanatory drawing about the arrangement configuration of the circumference | surroundings of the steam removal part which concerns on other embodiment of this invention. It is explanatory drawing about the arrangement configuration of the steam vent part which concerns on embodiment of this invention. It is explanatory drawing about the progress which peels and retreats of the steam release seal part which concerns on embodiment of this invention. In the microwave oven pouch according to the embodiment of the present invention, when the steam vent seal part is peeled off to the steam vent part, it is a diagram schematically showing the state seen from the inside of the pouch housing part. It is explanatory drawing about the steam venting part which concerns on other embodiment of this invention. It is explanatory drawing about the film of the pouch for microwave ovens concerning embodiment of this invention. It is a top view of the pouch for microwave ovens which concerns on a prior art example. It is explanatory drawing about the internal pressure rise of the pouch accommodating part in the pouch of the general shape which concerns on a prior art example. It is explanatory drawing about the progress which peels and retreats of the steam release seal part which concerns on a prior art example. It is the figure which showed simply the state seen from the inside of the pouch accommodating part, when the steam release seal part was peeled to the steam release part in the pouch for microwave ovens which concerns on a prior art example.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in this embodiment are not intended to limit the scope of the present invention only to those unless otherwise specified. .

<Overall configuration of microwave oven pouch>
With reference to FIG. 1, the whole structure of the microwave oven pouch 100 according to the present embodiment will be described. The microwave oven pouch 100 according to this embodiment is configured by sealing the peripheral edges of a pair of films 110 by heat welding. In the present embodiment, the peripheral seal portion 120 is formed by a pair of side seal portions 121 formed on both side edge sides, a bottom seal portion 122 formed on the bottom edge side, and a top seal portion 123 formed on the upper edge side. Provided. A sealed region inside these peripheral seal portions 120 (121, 122, 123) serves as a pouch accommodating portion 130 in which contents are accommodated. And in the range in which this pouch accommodating part 130 is provided, the planar shape is a flat shape and the steam vent part 140 which is an elliptical hole shape is formed. The vapor vent 140 may be provided only on one of the pair of films 110 or may be provided so as to penetrate both. Further, an unsealed portion 150 and a steam vent seal portion 160 are sequentially provided around the steam vent portion 140. The unsealed portion 150 is a portion where the pair of films 110 are not sealed, and the vapor vent seal portion 160 is formed by bonding the pair of films 110 together by thermal welding or the like. In the case of this embodiment, after forming the steam release seal part 160, the steam release part 140 is formed so as to penetrate both the pair of films 110.

<Arrangement configuration around the steam vent>
Next, an arrangement configuration around the steam vent 140 will be described with reference to FIGS. 1 to 3. The following description is common in that an unsealed portion 150 and a steam vent seal portion 160 are sequentially provided around the steam vent portion 140.

<< Arrangement configuration of unsealed part >>
The unsealed portion 150 is a portion where a pair of films are not sealed. The unsealed part 150 should just be provided over a part of circumference | surroundings of the vapor vent part 140, or the perimeter. By forming this unsealed portion 150, even if the formation position of the steam vent 140 formed in the unsealed portion 150 is deviated from the case where the unsealed portion 150 is not formed, the steam vent seal 160 It is possible to take a certain distance that peels back. Further, since the unsealed portion 150 promotes the peeling and retreating of the steam vent seal portion 160, the steam from the steam vent portion 140 can be discharged more efficiently.

  As a case where the unsealed part 150 is provided over the entire circumference of the periphery of the vapor vent part 140, for example, shapes such as FIG. 1 and FIG. 2 are conceivable. In the example shown in FIG. 1, the planar shape of the unsealed portion 150 is a circle, but the planar shape of the unsealed portion in the present invention is not limited to a circle. In the example shown in FIG. 2, the steam vent 140 is provided on the upper side of the pouch housing part 130 and in the vicinity of the lower end of the top seal part 123. For this reason, the unsealed portion 150 has a non-circular shape opened outward at the upper end of the microwave oven pouch 100. Note that the top seal portion 123 is not provided in the unsealed portion 150 surrounded by the steam release seal portion 160. As in these examples, by providing the unsealed part 150 over the entire circumference of the periphery of the steam venting part 140, even if the formation position of the steam venting part 140 formed in the unsealed part 150 is shifted, it is desirable. The deterioration of the function can be suppressed.

  Moreover, when the unsealed part 150 is provided in a part of the circumference | surroundings of the steam vent part 140, the shape as FIG. 3 can be considered, for example. In FIG. 3, the lower side of the drawing is the center point side of the pouch housing portion 130. In the example shown in FIG. 3, the unsealed part 150 is provided only in a part of the periphery of the vapor vent part 140 in any drawing. In FIG. 3A, the unsealed portion 150 is provided only on the center point O side and the opposite side of the pouch housing portion 130 through the steam vent portion 140 in the periphery of the steam vent portion 140. On the other hand, in FIG. 3B, the unsealed portion 150 is provided only on the center point O side of the pouch housing portion 130 in the periphery of the steam vent portion 140.

  As in these examples, when at least the unsealed portion 150 is provided on the center point O side of the pouch housing portion 130, the peeling and retreating of the steam release seal portion 160 is caused by the internal pressure spreading from the center side of the pouch housing portion 130. When reaching 150, it is possible to open the portion on the central point O side of the pouch housing portion 130 around the steam vent 140 at a stretch. For this reason, it is preferable because the steam can be discharged more efficiently while suppressing the content from being discharged from the steam vent 140.

<< Arrangement configuration of steam release seal part >>
The steam release seal portion 160 is formed by bonding a pair of films, and is configured to gradually peel and retract as the internal pressure in the pouch housing portion 130 increases when the microwave pouch 100 is heated. ing. The steam vent seal portion 160 is provided over a part or all of the circumference of the steam vent portion 140 and is configured to block between the pouch housing portion 130 and the steam vent portion 140. The planar shape is not limited.

  In the example shown in FIG. 1, the steam release seal portion 160 is provided concentrically with respect to the unsealed portion 150 over the entire circumference thereof, and the outer shape of the planar shape is circular. In the example shown in FIG. 3, the steam vent seal part 160 is provided over the entire circumference of the circumference of the steam vent part 140 so that a part of the steam vent seal part 160 contacts the steam vent part 140.

  On the other hand, in the example shown in FIG. 2, the steam venting portion 140 is provided on the upper side of the pouch housing portion 130 and in the vicinity of the lower end of the top seal portion 123. For this reason, the steam release seal part 160 is connected to the top seal part 123, and a part thereof is arranged so as to have the function of the top seal part 123. Therefore, the steam vent seal portion 160 is not formed on the upper side of the steam vent portion 140, but is formed on the pouch housing portion 130 side, and the contents filled in the pouch housing portion 130 are It is surely cut off from the steam vent 140.

  As described above, the steam vent seal portion 160 may be provided so as to block between the pouch housing portion 130 and the steam vent portion 140 over a part or all of the circumference of the steam vent portion 140. .

<Vapor vent part>
The steam vent 140 according to the present embodiment will be described in more detail with reference to FIGS. 1, 2, and 4 to 7. In addition, about the arrangement | positioning structure of the steam venting part demonstrated below, and the specific method of the center point of a pouch accommodating part, it is based on the pouch in the state in which the content is not filled in the pouch accommodating part.

<< Arrangement configuration of steam vent part >>
In particular, the arrangement configuration of the steam vent 140 will be described with reference to FIGS. FIG. 4 is an explanatory view of the arrangement configuration of the steam vent 140 according to the embodiment of the present invention, and shows the vicinity of the steam vent 140 provided in the microwave pouch 100 in a plan view. FIG. 5 is an explanatory diagram of the progress of peeling and retreating of the steam release seal portion according to the embodiment of the present invention, and the dotted line B represents the boundary line between the already peeled site and the unpeeled site of the steam release seal portion 160. ing. 4 and 5, the lower side of the drawing is the center point O side of the pouch housing portion 130.

The planar shape of the steam vent 140 is a flat shape, and the steam vent 140 shown in FIGS. 1, 2, 4 and 5 shows a case where the planar shape is an elliptical hole shape. In the oval hole-shaped steam vent 140, the longer side (long axis) is the longer direction, and the shorter side (short axis) is the shorter direction. The above-described longitudinal direction and short-side direction are the longest width directions in the steam vent 140.

  As shown in FIG. 4, the steam vent 140 has a portion extending in the longitudinal direction of the steam vent on the film surface of the pouch and the center point C of the width X in the longitudinal direction of the steam vent 140 and the pouch housing portion. It is formed in a range (0 °) parallel to the line N perpendicular to the straight line L connecting the center point O (not shown) of 130 or an angle α within ± 30 °.

The steam vent 140 is formed such that the longitudinal direction of the steam vent 140 is the D0 direction, the D1 direction, or the D2 direction in FIG. 4, and the longitudinal directions are parallel to the line N perpendicular to the straight line L, respectively. (0 °), α _{1 having a} positive angle with respect to the line N perpendicular to the straight line L (upper limit is + 30 °), or α _{2 having a} negative angle with respect to the line N perpendicular to the straight line L (lower limit is −30 °). Thus, the angle α in FIG. 4 is 60 °.

  Further, as shown in FIG. 5, the peeling and retreating of the steam release seal part 160 is performed on the side of the center point O of the pouch housing part 130 in the periphery of the steam release part 140 through the passage of dotted lines B1, B2 and B3. A contact point P (not shown) is reached. The internal pressure force (in the direction of arrow F) in the pouch housing portion 130 that promotes the separation and retraction and the progress of the separation and retraction of the steam release seal portion 160 are the same as those in FIGS. 10 and 11 of the conventional example described above. Therefore, when the peeling and retreating of the steam release seal part 160 reaches the dotted line B3 due to the internal pressure force in the pouch housing part 130 (in the direction of arrow F), the contact point P of the steam release part 140 is the starting point of the periphery of the steam release part 140 A portion extending in the longitudinal direction on the center point O side of the pouch housing portion 130 spreads left and right, a wide hole is formed, and steam is discharged to the outside of the pouch. FIG. 6 is a simplified view of the steam vent 140 viewed from the inside of the pouch in the direction of arrow F when the peeling back of the steam vent seal 160 reaches the tangent of the steam vent 140 on the dotted line B3 in FIG. Is shown. As shown in the drawing, in the present embodiment, a wide hole for releasing the steam is formed by a portion of the steam vent 140 extending over a wide range in the longitudinal direction.

  The arrangement of the steam vent 140 is such that the longitudinal direction of the steam vent 140 is a line perpendicular to the straight line connecting the center point C of the width X in the longitudinal direction of the steam vent 140 and the center point O of the pouch housing part 130. If it is formed parallel to N or outside the range of ± 30 ° or less, the above-described wide hole for discharging the vapor to the outside of the pouch will be defective, so it must be formed within the above-mentioned range.

As described above, the planar shape of the steam vent 140 is a flat shape, and the portion extending in the longitudinal direction of the steam vent 140 is the center of the longitudinal width of the steam vent 140 on the film surface of the pouch. By forming the point C in parallel with the line N perpendicular to the straight line connecting the point C and the center point O of the pouch housing part 130 or within a range of ± 30 ° or less, the steam release seal part 160 becomes the steam release part 140. When peeling back to the provided position, a hole capable of discharging steam can be formed over a wide range in the longitudinal direction of the steam vent 140. For this reason, for example, when the product of the microwave oven pouch 100 formed by the film 110 having a known configuration to be described later is heated in the range of 500 to 1900 W in the microwave oven, the pouch at the start of steam discharge The internal pressure of the housing part 130 can be suppressed to 125 kPa or less (absolute pressure), preferably 115 kPa or less (absolute pressure), and the internal pressure of the pouch housing part 130 after starting the discharge of steam is 115 kPa or less (absolute pressure). ) Can continue to be maintained. Therefore, the steam filled in the pouch housing part 130 starts to be discharged under an appropriate internal pressure, and the contents are removed from the steam while preventing the steam from being discharged vigorously for a long time after the discharge is started. It is possible to suppress the steam 140 from being caught and discharged from the portion 140, and the steam venting performance can be improved. In addition, by preventing the expansion state in the pouch housing portion 130 from being maintained for a long time while the contents remain at a high temperature, thermal damage to the pouch inner surface material and punching of the pouch due to thermal damage are suppressed. be able to. In addition, the steam vent 140
By making a flat shape, it is possible to suppress the entire steam release seal portion 160 from becoming large.

  In addition, the steam vent 140 has a longitudinal width X of 3 mm to 8 mm, a lateral width Y of 1 mm to 3 mm, and a longitudinal width X of the lateral width Y shown in FIG. It is preferable to set so as to satisfy 1.5 times to 8 times. By setting the steam vent 140 to the above-described width, the width of the steam vent 140 that allows the steam to escape while suppressing the content from being discharged from the steam vent 140 more appropriately. Can be wide.

  Further, as shown in FIG. 1, the steam vent 140 may be provided in the vicinity of corners corresponding to the four corners of the microwave oven pouch 100, or as shown in FIG. 2, near the upper portion of the microwave oven pouch 100 ( It may be provided in the vicinity of the top seal portion 123). In this way, by forming the steam release portion 140 at a position in the vicinity of the peripheral seal portion 120 (121, 122, 123), the amount of contents stored in the pouch housing portion 130 and the opening width of the pouch at the time of filling can be further increased. It is preferable because it can be ensured.

As shown in FIGS. 1 and 2, the steam vent 140 includes an inscribed circle C1 having a maximum vertical width W1 of the pouch accommodating portion 130 and an inscribed circle C2 having a maximum left and right width W2 of the pouch accommodating portion 130. It is provided in between. By providing at such a position, before the steam release seal portion 160 peels and retracts against the internal pressure force (in the direction of arrow F in FIG. 5) spreading from the center point O side of the pouch housing portion 130, the peripheral seal portion 120 (121, 122, 123) can be prevented from being peeled off, and moreover, it can be more reliably suppressed that the contents are involved in the discharge of the steam and discharged. Furthermore, since there is a distance from the center point O of the pouch housing part 130 to the steam vent seal part 160, the steam vent seal part 160 is excellent in drop strength and compressive strength, which is preferable. Further, as in the example shown in FIG. 1, the steam vent 140 is biased toward the inscribed circle C <b> 2 having a smaller diameter among the inscribed circle C <b> 1 having the maximum vertical width W <b> 1 and the inscribed circle C <b> 2 having the maximum horizontal width W <b> 2. If it is provided at the position, the above-mentioned effect is more preferable.

  As shown in FIGS. 1 and 2, the center point O of the pouch housing part 130 is formed by two parallel straight lines corresponding to the maximum vertical width W1 and two parallel straight lines corresponding to the left and right maximum width W2. The center of the rectangle R (corresponding to the centroid). The rectangle R is indicated by a thick line and a dotted line in FIGS. Other than these figures, for example, when the width of the pouch housing part 130 is partially narrowed due to, for example, a part of the peripheral seal part 120 (121, 122, 123) being enlarged, As described above, the center point O for obtaining the rectangle R from the maximum vertical width W1 and the maximum horizontal width W2 may be set. Then, with this center point O as a reference, an inscribed circle C1 having a maximum vertical width W1 and an inscribed circle C2 having a maximum horizontal width W2 may be set.

<< Other Embodiments of Vapor Release Part >>
With reference to FIG. 7, another embodiment of the steam vent 140 will be described. In FIG. 7, the lower side is the center point O side of the pouch housing portion 130, the arrow D direction is the longitudinal direction, and the direction perpendicular to the longitudinal direction is the short direction. Regarding the relationship between the width X in the longitudinal direction of the steam vent 140 and the width Y in the short direction of the steam vent 140 and the setting of the dimensions of these widths X and Y, the steam vent 140 is elliptical. Since this is the same as the case of the hole shape, description thereof will be omitted.

  As shown in FIG. 7, the planar shape of the steam vent 140 may be a flat shape, and a flat hole shape or a cut shape can be applied.

The steam vent 140 has, for example, a shape in which four corners of a rectangle are formed in an arc shape as shown in FIG. 7A, an oval shape (track shape) as shown in FIG. 7B, and a shape shown in FIG. It is also possible to adopt a steam vent 140 formed in such a rectangular shape and a long octagonal hole shape as shown in FIG. Further, as shown in FIGS. 7 (e) and 7 (f), a portion extending in the longitudinal direction on the central point O side of the pouch housing portion 130 in the peripheral edge of the steam release portion 140 is a straight line and extends in the opposing longitudinal direction. The part may be a steam vent hole 140 having a hole shape constituted by an asymmetric curve or straight line. Furthermore, as for the steam release part 140, as shown in FIG.7 (i) and FIG.7 (j), the site | part extended in the longitudinal direction of the center point O side of the pouch accommodating part 130 of the steam release part 140 contains a straight line, for example. It can also be a cut shape.

  As described above, a portion extending in the longitudinal direction on the central point O side of the pouch housing portion 130 of the steam venting portion 140 is a hole shape including a straight line (an oblong shape, a rectangular shape, etc.) or a cut shape including a straight line. As a result, the portion extending in the longitudinal direction on the central point O side of the pouch housing portion 130 in the peripheral edge of the steam release portion 140 more efficiently spreads to the left and right to form a wide hole, so that the discharge amount for discharging steam to the outside of the pouch And the discharge speed can be kept more appropriate, which is preferable.

  In addition to the elliptical shape of FIGS. 1 to 5, the steam vent 140 is a hole in which the portion extending in the longitudinal direction on the center point O side of the pouch housing portion 130 in the periphery of the steam vent 140 includes an arc shape. A shape can also be adopted. For example, a hole shape obtained by changing a straight line of a portion extending in the longitudinal direction on the central point O side of the pouch housing portion 130 of the steam release portion 140 of FIGS. 7A to 7E to an arc shape, or FIG. g) or a hole shape including an arc shape as shown in FIG. Further, as shown in FIG. 7 (j) and FIG. 7 (k), for example, as shown in FIG. 7J or FIG. It can also be set as the cut shape containing.

  When the microwave oven pouch 100 is heated, the internal pressure of the pouch housing part 130 increases and the pouch shape changes. In this deformation process, the vicinity of the central point O side of the pouch housing part 130 in the periphery of the steam release part 140. Unintended pouch bending may occur. The part extending in the longitudinal direction on the central point O side of the pouch housing part 130 of the steam venting part 140 is formed into a hole shape (such as an elliptical shape) including an arc shape or a cut shape, whereby the steam venting seal part 160 is peeled and retracted. The linear force (arrow F in FIG. 5) that promotes the pressure can be received by the curved surface of the steam release portion 140. Therefore, it is possible to prevent the bending described above. 7A to 7K, the portion extending in the longitudinal direction on the central point O side of the pouch housing portion 130 of the steam vent 140 spreads more efficiently to the left and right to form a wide hole. , The amount of discharge and the discharge speed of discharging steam to the outside of the pouch can be appropriately maintained. It is to be noted that the hole-shaped or cut-shaped steam vent 140 including the arc shape is convex toward the center point O side of the pouch container 130 so that the steam vent seal portion 160 is peeled and retracted linearly. 5 (arrow F in FIG. 5) is preferable because it can be easily received by the curved surface of the steam release portion 140.

  From the above, it is preferable that the portion extending in the longitudinal direction on the central point O side of the pouch housing portion 130 of the steam venting portion 140 has a hole shape (such as an elliptical shape) including an arc shape or a cut shape. .

  It should be noted that the arc portion in the case where the portion extending in the longitudinal direction on the central point O side of the pouch housing portion 130 of the steam release portion 140 described above has a hole shape or a cut shape including an arc shape has a radius of curvature of 2.5 mm or more. It is preferable that the thickness is 32 mm, particularly 3 mm to 20 mm. By setting within this range, it is possible to more effectively perform the above-described widening of the width of the hole for discharging the steam, improvement of the pouch shape retention, and securing of the steam discharge amount and discharge speed. When the radius of curvature is less than 2.5 mm, the arc portion has a problem as in the conventional example. When the radius of curvature is larger than 32 mm, the steam vent seal portion 160 needs to be formed larger along with the steam vent portion 140. come. For this reason, it is suitable to set it as the above-mentioned range.

<Structure of film>
With reference to FIG. 8, the film 110 which comprises the microwave oven pouch 100 is demonstrated in detail. FIG. 8 is an enlarged cross-sectional view of the film 110 used in the microwave oven pouch 100, and generally has a multilayer structure. The film 110 according to this embodiment includes a base resin layer 111, a barrier resin layer 112, an easily tearable resin layer 113, a heat sealable resin layer 114, and an adhesion for bonding each of these layers. Layer 115. Note that the heat-resistant resin layer 116 may be provided at a position where the easily tearable resin layer 113 is provided. However, the easily tearable resin layer 113 or the heat resistant resin layer 116 may or may not be provided as necessary.

<< Base resin layer >>
As the base resin layer 111 on the outer surface side of the pouch, a resin film used as a base resin film in a general pouch can be employed. As the base resin layer 111, it is desirable to use a film having high mechanical strength. Specifically, polyester films such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, ethylene terephthalate / isophthalate copolymer, nylon 6, nylon 6,6, nylon 11, nylon 12, nylon 6 / nylon 6,6 A suitable example is a polyamide film such as a copolymer. These films are used as uniaxially or biaxially stretched films. Among these stretched films, a biaxially stretched polyethylene terephthalate film excellent in mechanical strength, crack resistance, and heat resistance can be suitably used.

<< Barrier resin layer >>
The barrier resin layer 112 plays a role of enhancing the storage stability and flavor retention of the contents. As this barrier resin layer 112, as a gas barrier resin layer for preventing oxygen permeation from the outside of the pouch, an ethylene vinyl alcohol copolymer, a polyamide resin such as polymetaxylylene adipamide (MXD6), a polyvinylidene chloride resin, A film made of a barrier resin such as polyglycolic acid or a coating barrier film having a coating barrier layer coated with a coating agent made of a gas barrier resin such as a polyvinyl alcohol polymer or a polycarboxylic acid polymer may be employed. it can. In addition to gas barrier properties, as a barrier resin layer that also has moisture barrier properties to prevent the release of moisture from the contents of the pouch, it can be applied to metal oxide vapor deposition layers such as aluminum oxide and silicon oxide vapor deposition layers. Metalloxane bond by inorganic vapor deposition layer represented by inorganic vapor deposition layer typified by, or inorganic vapor deposition film typified by hydrocarbon vapor deposition layer such as diamond-like carbon, or hydrolyzed compound such as metal alkoxide or metal halide A coating barrier film or the like having a coating barrier layer to which a coating agent made of a compound having the above is applied can be employed. The film for forming the inorganic vapor deposition layer or the coating barrier layer is not limited to these, but a uniaxial or biaxially stretched film made of polyethylene terephthalate resin or nylon resin can be suitably used. In addition, a nylon film is selected as the barrier resin layer 112 having both gas barrier properties and moisture barrier properties, and a barrier resin layer 112 (inorganic vapor deposition film) formed with an inorganic vapor deposition layer, or a coating barrier layer coated with a coating agent When laminating the barrier resin layer 112 (coating barrier film) having an inorganic vapor-deposited layer or coating barrier layer on the inner surface side of the nylon film, moisture absorbed by the nylon film is released to the outer surface of the pouch. This is preferable because it is possible. In this way, by forming an inorganic vapor deposition layer or a coating barrier layer on the inner surface side from the nylon film, the moisture content in the nylon film is reduced by the above-mentioned release of moisture, so the nylon film by using a microwave oven It becomes possible to prevent foaming of the nylon film due to moisture heating inside, that is, thermal damage of the pouch. Specific examples of the layer structure include a base resin layer 111 made of a biaxially stretched polyethylene terephthalate film, an inorganic vapor deposition layer on the inner surface side of the biaxially stretched nylon film, or a barrier resin layer 112 having a coating barrier layer, unstretched A multilayer film in which a heat-sealable resin layer 114 made of a polypropylene film is bonded with a polyurethane-based adhesive may be used. The base resin layer 111 is made of two layers, a biaxially stretched polyethylene terephthalate film and a biaxially stretched nylon film, and an inorganic vapor deposition layer or a coating barrier layer is formed on the biaxially stretched polyethylene terephthalate film inside the biaxially stretched nylon terephthalate film. The barrier resin layer 112 may be formed. In addition, when filling the contents by hot filling, aseptic filling or the like without performing retort sterilization, the heat resistance required for the film 110 is low, so the base resin layer 111 and the barrier resin layer 112 are combined. It is also possible to use only a barrier resin layer 112 made of a nylon film. As an example of such a multilayer film, on the inner surface side of the biaxially stretched nylon film, an inorganic vapor-deposited layer, or a barrier resin layer 112 having a coating barrier layer, a heat-sealable resin layer 114 made of an unstretched polypropylene film, A multilayer film bonded with a polyurethane-based adhesive may be mentioned. Thus, depending on the filling temperature of the contents and the sterilization method, the base resin layer 111 and / or the barrier resin layer 112, the heat seal resin layer 114, and the adhesive 115 for bonding each of these layers, It is good also as a multilayer film comprised from these. And it becomes possible to prevent more effectively the heat damage by microwave oven heating by setting it as the pouch 100 for microwave ovens which combined these multilayer films and the shape and arrangement | positioning structure of the vapor removal part 140 of this invention. The barrier resin layer 112 configured as described above is also excellent in oxygen barrier properties, odor component barrier properties, and moisture barrier properties.

<< Easily tearable resin layer >>
As the easily tearable resin layer 113, a polypropylene film, a high density polyethylene film, and a polyester film that are easily tearable and stretched uniaxially (MD direction) or biaxially (MD direction and TD direction). A polyamide film or the like can be used. Specific examples of the easily tearable resin layer 113 include Trefan BO YT series manufactured by Toray Industries, Inc., Kalaryan manufactured by Denki Kagaku Kogyo Co., Ltd., Hybron, Noblen, and Idemitsu Unitech Co., Ltd. manufactured by Tokyo Ink. Examples include UNIASRON manufactured by UNITIKA Co., Ltd., Emblem NC manufactured by Unitika Ltd., and Emblet PC. The easily tearable resin layer 113 is provided so that the extending direction thereof coincides with the tearing direction when the pouch is opened, thereby suppressing the occurrence of tear width deviation (so-called cut deviation) between the front and back sides of the pouch during opening. , Easy openability can be improved. Note that the position where the easily tearable resin layer 113 is provided is not limited to the position shown in FIG. 8 and may be laminated at any position. Moreover, as shown in FIG. 8, the easily tearable resin layer 113 may be provided independently, or another layer may be provided with easy tearability.

<< Heat sealable resin layer >>
As the heat-sealable resin layer 114 provided on the inner surface side of the pouch, a general heat-sealable resin used for the pouch can be used. More specifically, low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, ethylene / α-olefin copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene -Suitable examples include films made of resins such as methacrylic acid copolymers, ethylene-acrylic acid ester copolymers, ethylene-methacrylic acid ester copolymers, polypropylene, acid-modified polyolefin resins, and ionomers. Note that the heat-sealable resin layer 114 may be a single layer by using these materials, or may be a multilayer by using a plurality of materials. In particular, from the viewpoint of heat resistance, unstretched polypropylene can be suitably used as the heat-sealable resin layer 114. The thickness of the heat-sealable resin layer 114 is preferably in the range of 50 to 100 μm.

<< Adhesive layer >>
As the adhesive resin used for the adhesive layer 115, various known materials can be applied. For example, a polyurethane-based adhesive can be suitably used from the viewpoint of heat resistance.

<< Heat-resistant resin layer >>
The microwave pouch 100 according to the present embodiment requires heat resistance that can withstand retort sterilization depending on the filling temperature of the contents and the sterilization method, but contained a highly viscous content and solids. When the contents are filled, when heated in a microwave oven, there is a possibility that a local high temperature part is generated and a hole is formed. In such a case, it is desirable to provide the heat-resistant resin layer 116 independently between the barrier resin layer 112 and the heat-sealable resin layer 114, which are close to the contents. However, the heat-resistant resin layer 116 is not limited to the position shown in FIG. 8 and can be provided at other positions, similarly to the easily tearable resin layer 113. Moreover, you may give heat resistance to another layer. Specific examples of the heat-resistant resin layer 116 include polyester films such as polyethylene terephthalate and polybutylene terephthalate, polyamide films such as nylon, and the like. Further, as the heat resistant resin layer 116, a uniaxially or biaxially stretched layer can be suitably used.

<< Other >>
In addition to the various layers described above, layers having other functions can be provided. For example, an impact-resistant resin layer can be provided in order to improve the puncture resistance, drop impact resistance, etc. of the pouch. Further, in the embodiment of the present invention, the case where only one steam vent is provided in the pouch has been shown, but a configuration in which a plurality of steam vents are provided may be employed. In this case, all the steam vents may satisfy the above arrangement, or may include a steam vent that does not satisfy the above arrangement. Furthermore, in the embodiment of the present invention, a configuration in which a pair of films 110 is used and four sides are sealed is shown, but the present invention is not limited to such a pouch. For example, the present invention can be applied to a pouch in which one film is bent and two or three sides are sealed. The present invention can be applied to various types of pouches such as a pillow type pouch, a gusset type pouch, and a standing pouch.

DESCRIPTION OF SYMBOLS 100 Pouch specification for microwave oven 110 Film 111 Base resin layer 112 Barrier resin layer 113 Easy tear resin layer 114 Heat seal resin layer 115 Adhesive layer 116 Heat resistant resin layer 121 Side seal part 122 Bottom seal part 123 Top seal Part 130 Pouch accommodating part 140 Vapor vent part 150 Unsealed part 160 Vapor vent seal part

According to the present invention,
In a microwave pouch having a steam vent,
The planar shape of the vapor vent is a flat hole shape or a cut shape ,
The portion extending in the longitudinal direction of the steam venting portion is on the film surface of the pouch with respect to a line perpendicular to the straight line connecting the center point of the longitudinal width of the steam venting portion and the center point of the pouch accommodating portion. It is formed in the pouch housing part to be parallel or ± 30 ° or less,
An unsealed portion and a steam vent seal portion are sequentially provided around the steam vent portion.

Claims (13)

In a microwave pouch having a steam vent,
The planar shape of the steam vent is a flat shape,
The portion extending in the longitudinal direction of the steam venting portion is on the film surface of the pouch with respect to a line perpendicular to the straight line connecting the center point of the longitudinal width of the steam venting portion and the center point of the pouch accommodating portion. It is formed in the pouch housing part to be parallel or ± 30 ° or less,
An unsealed portion and a steam vent seal portion are sequentially provided around the steam vent portion.   2. The microwave oven pouch according to claim 1, wherein the unsealed portion is provided at least on a portion on the center point side of the pouch housing portion in the periphery of the vapor venting portion.   2. The microwave oven pouch according to claim 1, wherein the unsealed portion is provided over the entire circumference of the periphery of the vapor vent portion. The steam vent is
The width in the longitudinal direction of the steam vent is 3 mm to 8 mm, the width in the short direction of the steam vent is 1 mm to 3 mm,
4. The microwave oven according to claim 1, wherein a width in a longitudinal direction of the steam vent is 1.5 to 8 times a width in a short direction of the steam vent. 5. Pouch. The steam vent is
5. The pouch for a microwave oven according to claim 1, wherein the portion extending in the longitudinal direction on the central point side of the pouch housing portion of the steam release portion is a hole shape including a straight line or a cut shape. . The steam vent is
5. The microwave oven according to claim 1, wherein the portion extending in the longitudinal direction on the central point side of the pouch housing portion of the steam release portion is a hole shape including a circular arc shape or a cut shape. Pouch.   7. The microwave oven pouch according to claim 6, wherein the arc-shaped curvature radius is in a range of 2.5 mm to 32 mm.   The microwave oven pouch according to any one of claims 1 to 7, wherein the steam venting portion is provided in the vicinity of a corner portion of the pouch.   8. The microwave oven pouch according to any one of claims 1 to 7, wherein the steam vent is provided in the vicinity of an upper portion of the pouch.   10. The steam vent according to claim 1, wherein the steam vent is provided between an inscribed circle having a maximum vertical width of the pouch accommodating portion and an inscribed circle having a maximum lateral width of the pouch accommodating portion. The pouch for microwave ovens as described in any one. The microwave oven pouch is formed of a multilayer film,
The multilayer film has at least a nylon film and a heat-sealable resin layer,
11. The microwave oven according to claim 1, wherein a coating barrier layer in which a coating agent made of a compound having an inorganic vapor deposition layer or a metalloxane bond is applied is formed on the inner surface side of the nylon film. Pouch for.   The pouch for a microwave oven according to claim 11, wherein the multilayer film comprises a base resin layer made of a polyethylene terephthalate film, a barrier resin layer made of the nylon film, and the heat sealable resin layer. .   The multilayer film comprises a base resin layer composed of two layers of a polyethylene terephthalate film and the nylon film, a barrier resin layer composed of polyethylene terephthalate, and the heat sealable resin layer. The microwave oven pouch described.

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