Cookable frozen food packaging film

Abstract

The utility model discloses a cooking frozen food packaging film which comprises an outer bag, a bag body is arranged at the bottom end of the outer bag, a sealing bottom is arranged at the bottom end of the bag body, the section of the bag body is in a wave shape, and an outer film layer, a polyethylene film layer, a bonding layer, a high-barrier film and an inner film are sequentially arranged in the bag body from outside to inside. The bag body is of a hollow tubular structure without two surfaces at the two ends, secondary processing treatment is carried out on the bag body structure, the processed bag body structure can expand outwards and enlarge the internal gas volume through the characteristic of the wavy section when the bag body structure is cooked, the conditions of bag expansion, damage and the like caused by a large amount of gas are avoided, and the service life of the bag body is prolonged. The film-level structures are formed by bonding, heat sealing and fixing, the structural integrity is improved, the EVOH-containing films provide good cooking impact restorability, long shelf life, high oxygen barrier and optical transparency, and the application range of the device is widened.

Description

Technical Field

[0001] The utility model relates to the field of packaging films, in particular to a packaging film for frozen food that can be steamed and boiled. Background Art

[0002] Retort operations are used to thermally process foods and sterilize primary packaging components. Foods packaged in retortable containers, such as bags, are transferred to an autoclave where they are subjected to retort conditions, including temperatures generally exceeding the boiling point of water and elevated pressures, for a certain period of time. Retort containers are therefore designed to withstand retort conditions.

[0003] The existing high temperature resistant retort bags are all flat, suitable for retorting hard foods or liquids. However, for stick-shaped solid foods with high water content or soft texture, when vacuuming and high temperature sterilization are performed, the flat retort bag will squeeze the food, causing the food to deform. The bag space is small, and the soft food will further stick together, losing the original sensory properties of the food. For example, Chinese patent CN 206367722 U discloses a high temperature and high pressure retort bag, which mainly includes an inner film, a pressure relief layer, a pressure spring, an outer film, a through hole, a pressure relief hose, an exhaust pressure relief valve, a self-sealing strip, a supporting device and a cotton hanging ring. The pressure spring after heat treatment can disperse the pressure, reduce the pressure directly acting on the food in the bag, and prevent the food from being squeezed by pressure and destroying its shape. However, the retort bag is sealed by a self-sealing strip, and the vacuum packaging effect cannot be achieved. After high temperature and high pressure, the bag is easily broken from the seal. Moreover, the retort bag has a complex structure, a thick material, and slow heat transfer, and is not suitable for high temperature heating and retorting of general stick-shaped solid foods. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, the utility model provides a retortable frozen food packaging film, by performing secondary processing on the bag structure. The processed bag structure can expand outwards due to its wavy cross-sectional characteristics when being retorted, thereby expanding the internal gas volume and avoiding bag bulging and damage caused by the generation of a large amount of gas.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions: a steamable frozen food packaging film, including an outer bag, a bag body is arranged at the bottom end of the outer bag, a bottom seal is arranged at the bottom end of the bag body, the cross-section of the bag body is wavy, and the bag body is sequentially provided with an outer film layer, a polyethylene film layer, an adhesive layer, a high barrier film and an inner film in the order from the outside to the inside, and the bag body is a hollow tubular structure with no faces at both ends.

[0006] As a preferred technical solution of the utility model, the hierarchical structures in the bag body are bonded and fixed by an adhesive layer.

[0007] As a preferred technical solution of the utility model, the two ends of the bag body are connected and fixed to the outer package and the bottom cover respectively through a heat sealing process.

[0008] As a preferred technical solution of the utility model, a quick-tear structure is provided on one side of the outer package.

[0009] As a preferred technical solution of the utility model, the high barrier film is made of a cookable grade ethylene vinyl alcohol (EVOH) copolymer.

[0010] As a preferred technical solution of the utility model, the outer film layer and the inner film are both transparent composite plastic films.

[0011] Compared with the prior art, the utility model can achieve the following beneficial effects:

[0012] 1. In this device, the bag structure is subjected to secondary processing. The processed bag structure can expand outwards during steaming due to its wavy cross-sectional characteristics, thereby expanding the internal gas volume and avoiding bag bulging and damage caused by the generation of a large amount of gas.

[0013] 2. In this device, through the combined structure of outer film-polyethylene film layer-adhesive layer-high barrier layer-inner film, each group of membrane-level structures is fixed by bonding and heat sealing to improve the structural integrity. These EVOH-containing films provide good cooking impact recovery, long shelf life, high oxygen barrier, and optical transparency, which improves the scope of use of this device. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Figure 2 This is the structural front view of the utility model;

[0016] Figure 3 It is a structural cross-sectional view of the utility model;

[0017] Figure 4 It is a schematic diagram of the structure of the bag body of the utility model;

[0018] Figure 5 for Figure 4 The main view of the structure;

[0019] Figure 6 for Figure 5 Schematic diagram of the structure at point A in the middle.

[0020] Among them: 1. outer packaging; 2. bottom cover; 3. bag body; 31. outer film; 32. polyethylene film layer; 33. adhesive layer; 34. high barrier film; 35. inner film. DETAILED DESCRIPTION

[0021] In order to make the technical means, creative features, purpose and efficacy of the utility model easy to understand, the utility model is further described below in conjunction with specific embodiments, but the following embodiments are only preferred embodiments of the utility model, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the utility model. The experimental methods in the following embodiments are conventional methods unless otherwise specified, and the materials, reagents, etc. used in the following embodiments are all commercially available unless otherwise specified.

[0022] Embodiment:

[0023] like Figure 1-6 As shown, the utility model provides a retortable frozen food packaging film, including an outer bag 1, a bag body 3 is arranged at the bottom end of the outer bag 1, a bottom seal 2 is arranged at the bottom end of the bag body 3, the cross-section of the bag body 3 is wavy, and the bag body 3 is provided with an outer film layer 31, a polyethylene film layer 32, an adhesive layer 33, a high barrier film 34 and an inner film 35 in sequence from the outside to the inside, and the bag body 3 is a hollow tubular structure with no surface at both ends; through the combined structure of the outer film 31-polyethylene film layer 32-adhesive layer 33-high barrier layer 34-inner film 35, each group of film-level structures is fixed by bonding and heat sealing, thereby improving the structural integrity, and these EVOH-containing films provide good retort impact recovery, long shelf life, high oxygen barrier, and optical transparency, thereby improving the scope of use of the device.

[0024] In other embodiments, the hierarchical structures in the bag body 3 are bonded and fixed by an adhesive layer 33; the two ends of the bag body 3 are connected and fixed to the outer package 1 and the bottom cover 2 respectively by a heat sealing process; a quick-tear structure is opened on one side of the outer package 1; the high barrier film 34 is made of a cooking grade ethylene vinyl alcohol (EVOH) copolymer; the outer film layer 31 and the inner film 35 are both transparent composite plastic films; by performing secondary processing on the bag body 3 structure, the processed bag body 3 structure can expand outward due to its wavy cross-sectional characteristics when being cooked, thereby expanding the internal gas volume and avoiding bag bulging and damage caused by the generation of a large amount of gas.

[0025] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A retortable frozen food packaging film, comprising an outer bag (1), characterized in that: A bag body (3) is arranged at the bottom end of the outer package (1), and a bottom seal (2) is arranged at the bottom end of the bag body (3). The cross section of the bag body (3) is wavy, and the bag body (3) is provided with an outer film layer (31), a polyethylene film layer (32), an adhesive layer (33), a high barrier film (34) and an inner film (35) in sequence from the outside to the inside. The bag body (3) is a hollow tubular structure with no faces at both ends.

2. The retortable frozen food packaging film according to claim 1, characterized in that: The layered structures in the bag body (3) are bonded and fixed via an adhesive layer (33).

3. The retortable frozen food packaging film according to claim 1, characterized in that: The two ends of the bag body (3) are respectively connected and fixed to the outer package (1) and the bottom cover (2) by a heat sealing process.

4. The retortable frozen food packaging film according to claim 1, characterized in that: A quick-tear structure is provided on one side of the outer package (1).

5. The retortable frozen food packaging film according to claim 1, characterized in that: The high barrier film (34) is made of a cookable grade ethylene vinyl alcohol (EVOH) copolymer.

6. The retortable frozen food packaging film according to claim 1, characterized in that: The outer film layer (31) and the inner film (35) are both transparent composite plastic films.

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