阅读说明：本技术 一种适用微波加热自动排气包装膜及其封边方法 (Automatic exhaust packaging film suitable for microwave heating and edge sealing method thereof ) 是由 廖艺淳 廖江南 于 2021-03-08 设计创作，主要内容包括：本发明公开了一种适用微波加热自动排气包装膜及其封边方法,涉及食品袋技术领域,该方案包括袋体,所述袋体的侧边设置有热封边,所述热封边处设置有排气结构；所述排气结构包括第一热压部、胀气部和第二热压部,所述第一热压部、胀气部和第二热压部按照从靠近袋体至远离袋体的顺序依次设置,所述第一热压部和第二热压部的宽度均小于热封边的宽度,且第一热压部和第二热压部处的热压强度均小于热封边处的热压强度；本发明解决了无需在袋体上扎孔即可实现排气,且成本低的技术问题。(The invention discloses an automatic exhaust packaging film suitable for microwave heating and a sealing method thereof, and relates to the technical field of food bags, the scheme comprises a bag body, wherein a heat sealing edge is arranged on the side edge of the bag body, and an exhaust structure is arranged at the heat sealing edge; the exhaust structure comprises a first hot pressing part, an air expanding part and a second hot pressing part, wherein the first hot pressing part, the air expanding part and the second hot pressing part are sequentially arranged from the position close to the bag body to the position far away from the bag body, the widths of the first hot pressing part and the second hot pressing part are smaller than the width of the hot sealing edge, and the hot pressing strengths of the first hot pressing part and the second hot pressing part are smaller than the hot pressing strength of the hot sealing edge; the invention solves the technical problems that the air can be exhausted without pricking holes on the bag body and the cost is low.)

1. The utility model provides a be suitable for microwave heating self-bleeding packaging film which characterized in that: the bag comprises a bag body, wherein a heat sealing edge is arranged on the side edge of the bag body, and an exhaust structure is arranged at the heat sealing edge;

the exhaust structure comprises a first hot pressing portion, an air expanding portion and a second hot pressing portion, wherein the first hot pressing portion, the air expanding portion and the second hot pressing portion are sequentially arranged from the position close to the bag body to the position far away from the bag body, the width of the first hot pressing portion and the width of the second hot pressing portion are smaller than that of the hot sealing edge, and the hot pressing strength of the first hot pressing portion and the hot pressing strength of the second hot pressing portion are smaller than that of the hot sealing edge.

2. The packaging film suitable for microwave heating and automatic venting as claimed in claim 1, wherein: the first hot pressing part is arc-shaped.

3. The packaging film suitable for microwave heating and automatic venting as claimed in claim 1, wherein: one side of the air expansion part close to the first hot pressing part is provided with a sharp corner, and the first hot pressing part surrounds the sharp corner.

4. The self-venting packaging film suitable for microwave heating according to any one of claims 1-3, wherein: one side of the heat-sealing edge far away from the bag body is provided with a notch for tearing the bag body.

5. The edge sealing method suitable for microwave heating of the automatic exhaust packaging film is characterized by comprising the following steps of: the method comprises the following steps:

step one, carrying out hot-pressing edge sealing on the hot-sealing edge of the bag body by adopting a hot-pressing edge sealing machine, wherein the hot-sealing temperature is as follows: 150 ℃ and 200 ℃, heat sealing time: 1.0-1.5 seconds, heat sealing pressure: 0.3-0.5 Mpa;

step two, carrying out hot-pressing edge sealing on the heat-sealed edges by a hot-pressing edge sealing machine, and simultaneously carrying out hot-pressing edge sealing on the first hot-pressing part and the second hot-pressing part, forming an air expansion part between the first hot-pressing part and the second hot-pressing part after the edge sealing is finished, wherein the temperature, time and pressure for carrying out the heat sealing on the first hot-pressing part and the second hot-pressing part are all smaller than the temperature, time and pressure for carrying out the heat sealing on the heat-sealed edges;

and step three, after the heat sealing is finished, performing water cooling treatment on the heat sealing edge, the first heat pressing part and the second heat pressing part.

Technical Field

The invention relates to the technical field of food bags, in particular to an automatic exhaust packaging film suitable for microwave heating and a sealing method thereof.

Background

At present, food packaging microwave heating basically needs exhaust, otherwise, water vapor expansion bags are formed and exploded due to heating, safety is harmed, and in addition, the content splashes and is difficult to clean, troubles are brought to consumers, and experience is influenced. The food packaging bag in the prior art adopts the following modes for microwave heating and exhausting: 1. the addition of a one-way exhaust valve or sheet has the following disadvantages: the cost is increased; 2. the consumer pricks the hole on the wrapping bag, realizes exhausting, the shortcoming: the user experience is poor, no technical content exists, and the packaging value is difficult to improve.

Disclosure of Invention

The invention aims to realize air exhaust without pricking holes on a bag body and has low cost.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

an automatic exhaust packaging film suitable for microwave heating comprises a bag body, wherein a heat sealing edge is arranged on the side edge of the bag body, and an exhaust structure is arranged at the heat sealing edge;

the exhaust structure comprises a first hot pressing portion, an air expanding portion and a second hot pressing portion, wherein the first hot pressing portion, the air expanding portion and the second hot pressing portion are sequentially arranged from the position close to the bag body to the position far away from the bag body, the width of the first hot pressing portion and the width of the second hot pressing portion are smaller than that of the hot sealing edge, and the hot pressing strength of the first hot pressing portion and the hot pressing strength of the second hot pressing portion are smaller than that of the hot sealing edge.

Further, the first hot pressing portion is arc-shaped.

Furthermore, a sharp corner is arranged on one side, close to the first hot pressing portion, of the inflation portion, and the first hot pressing portion surrounds the sharp corner.

Furthermore, a notch for tearing the bag body is formed in one side, far away from the bag body, of the heat sealing edge.

The invention also provides a sealing method suitable for microwave heating automatic exhaust packaging films, which comprises the following steps:

step one, carrying out hot-pressing edge sealing on the hot-sealing edge of the bag body by adopting a hot-pressing edge sealing machine, wherein the hot-sealing temperature is as follows: 150 ℃ and 200 ℃, heat sealing time: 1.0-1.5 seconds, heat sealing pressure: 0.3-0.5 Mpa;

step two, carrying out hot-pressing edge sealing on the heat-sealed edges by a hot-pressing edge sealing machine, and simultaneously carrying out hot-pressing edge sealing on the first hot-pressing part and the second hot-pressing part, forming an air expansion part between the first hot-pressing part and the second hot-pressing part after the edge sealing is finished, wherein the temperature, time and pressure for carrying out the heat sealing on the first hot-pressing part and the second hot-pressing part are all smaller than the temperature, time and pressure for carrying out the heat sealing on the heat-sealed edges;

and step three, after the heat sealing is finished, performing water cooling treatment on the heat sealing edge, the first heat pressing part and the second heat pressing part.

The invention has the beneficial effects that: according to the invention, the exhaust structure is arranged at the heat-seal edge, when people put the bag body filled with food into a microwave oven for heating, moisture in the food is heated to form steam, so that the bag body is expanded, the air pressure in the bag body is increased, because the widths of the first heat pressing part and the second heat pressing part are both smaller than the width of the heat seal edge, and the hot pressing strengths of the first heat pressing part and the second heat pressing part are both smaller than the hot pressing strength of the heat seal edge, the steam in the bag body firstly breaks the first heat pressing part under the action of high air pressure, the air pressure in the expanding part is increased, and then the second heat pressing part is broken, so that the steam in the bag body is exhausted out of the bag body, thereby realizing the purpose of exhausting without pricking holes on the bag body.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is an enlarged view taken at A in FIG. 1;

the reference signs are:

a bag body 1, a heat-sealing edge 2,

the exhaust structure 3, the first thermal pressing portion 31, the expansion portion 32, the second thermal pressing portion 33,

and (4) a notch.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

As shown in fig. 1 and 2, the packaging film suitable for microwave heating and capable of automatically exhausting comprises a bag body 1, wherein a heat sealing edge 2 is arranged on the side edge of the bag body 1, and an exhaust structure 3 is arranged at the position of the heat sealing edge 2.

The venting structure 3 comprises a first heat pressing portion 31, an inflation portion 32 and a second heat pressing portion 33, wherein the first heat pressing portion 31, the inflation portion 32 and the second heat pressing portion 33 are sequentially arranged from the position close to the bag body 1 to the position far away from the bag body 1.

The width of the first hot pressing part 31 and the width of the second hot pressing part 33 are both smaller than the width of the hot edge sealing 2, and the hot pressing strength of the first hot pressing part 31 and the second hot pressing part 33 are both smaller than the hot pressing strength of the hot edge sealing 2, the effect can be realized by the same hot edge sealing machine, only the hot pressing mold is required to be correspondingly improved, when the hot edge sealing machine is used for hot pressing, the hot pressing molds at the first hot pressing part 31 and the second hot pressing part 33 are separately manufactured, and the width of the hot pressing molds is reduced, so that the hot pressing effect that the width of the first hot pressing part 31 and the width of the second hot pressing part 33 are both smaller than the width of the hot edge sealing 2 can be realized; the depth of the hot pressing part is increased, so that the hot pressing effect that the hot pressing strength of the first hot pressing part 31 and the second hot pressing part 33 is smaller than that of the hot sealing edge 2 can be realized.

The first heat pressing part 31 is arc-shaped, one side of the inflating part 32 close to the first heat pressing part 31 is provided with a sharp corner, the first heat pressing part 31 surrounds the sharp corner, when people put the bag body 1 filled with food into a microwave oven for heating, water in the food is heated to form steam, so that the bag body 1 is inflated, the air pressure in the bag body 1 is increased, because the width of the first heat pressing part 31 and the width of the second heat pressing part 33 are both smaller than the width of the heat sealing edge 2, and the hot pressing strength of the first heat pressing part 31 and the second heat pressing part 33 is both smaller than the hot pressing strength of the heat sealing edge 2, the steam in the bag body 1 firstly breaks the first heat pressing part 31 under the action of high air pressure, enters the inflating part 32 from the corner surrounded by the first heat pressing part 31, so that the air pressure in the inflating part 32 is increased, and then breaks the second heat pressing part 33, so that the steam in the bag body 1 is discharged out of the bag body 1, thereby realizing the purpose of exhausting without punching holes on the bag body 1, on the other hand, compared with the prior art, the invention has the advantage that the exhaust valve is not required to be arranged on the bag body 1, so that the cost is reduced.

One side that the bag body 1 was kept away from to hot banding 2 is offered and is used for tearing the breach 4 of the bag body 1, and after the food heating of the bag body 1 inside was accomplished, people torn the bag body 1 through breach 4, took out food and eat.

The method comprises the steps of randomly drawing 20 bag bodies 1 as samples to carry out a microwave experiment, respectively filling 50ml of water and 10ml of vegetable oil into the 20 bag bodies 1, sequentially putting the bags into a microwave oven to carry out high-fire heating for 20-40 seconds, and sequentially breaking the first hot pressing part 31 and the second hot pressing part 33 by water vapor formed in the 20 bag bodies 1 and discharging the water vapor.

The invention also provides a sealing method suitable for microwave heating automatic exhaust packaging films, which comprises the following steps:

step one, adopting a hot-pressing edge sealing machine to carry out hot-pressing edge sealing on the heat-sealing edge 2 of the bag body 1, wherein the heat-sealing temperature is as follows: 150 ℃ and 200 ℃, heat sealing time: 1.0-1.5 seconds, heat sealing pressure: 0.3-0.5 Mpa;

step two, carrying out hot-pressing edge sealing on the heat-sealed edge 2 by a hot-pressing edge sealing machine, and simultaneously carrying out hot-pressing edge sealing on the first hot pressing part 31 and the second hot pressing part 33, after the edge sealing is finished, forming an air expansion part 32 between the first hot pressing part 31 and the second hot pressing part 33, wherein the temperature, time and pressure for carrying out the heat sealing on the first hot pressing part 31 and the second hot pressing part 33 are all smaller than the temperature, time and pressure for carrying out the heat sealing on the heat-sealed edge 2;

and step three, after the heat sealing is finished, performing water cooling treatment on the heat-sealed edge 2, the first heat pressing part 31 and the second heat pressing part 33.

The working principle of the invention is as follows: when people put the bag body 1 filled with food into a microwave oven for heating, water in the food is heated to form steam, so that the bag body 1 is expanded, the air pressure in the bag body 1 is increased, because the widths of the first hot pressing part 31 and the second hot pressing part 33 are both smaller than the width of the hot sealing edge 2, and the hot pressing strengths of the first hot pressing part 31 and the second hot pressing part 33 are both smaller than the hot pressing strength of the hot sealing edge 2, the steam in the bag body 1 firstly breaks the first hot pressing part 31 under the action of high air pressure, the air pressure in the expanding part 32 is increased, and then the second hot pressing part 33 is broken, so that the steam in the bag body 1 is discharged out of the bag body 1.

The technical scope of the present invention is not limited to the above embodiments, and any modifications, equivalent variations and modifications made to the above embodiments according to the technical spirit of the present invention still fall within the technical scope of the present invention.