English 
中文简体The long-term preservation performance of the multi-grain jelly stand-up bag comes from the deep integration of material science, structural design and process control. In terms of material selection, a PET/AL/NY/PE composite structure is used, in which the aluminum foil layer (AL) forms a physical barrier to effectively block oxygen (oxygen permeability ≤0.5cm³/㎡·24h·0.1MPa), avoiding the oxidative degradation of nutrients such as vitamins in the jelly; the polyethylene (PE) inner layer provides heat sealing performance to ensure the sealing strength (heat sealing strength ≥50N/15mm) and prevent microbial penetration.
At the process level, precise control of heat sealing temperature and pressure is the key. For example, the heat sealing temperature of PET composite materials needs to be ≤135℃ to avoid high temperature causing material degradation; the sealing pressure needs to be dynamically adjusted according to the thickness of the material to ensure that the sealing edge is uniform and free of bubbles. The airtightness is verified by the inflation test method: after filling the bag with air and squeezing it in water, no bubbles escape, indicating that the sealing is good.
In view of the weakly acidic environment of multi-grain jelly, the packaging material needs to be resistant to chemical corrosion. Experiments show that when reinforced MPET (aluminum-coated polyester) is used to replace traditional aluminum foil, although the barrier property is slightly reduced, the material cost can be reduced by 15%-20%, while meeting the need for storage at room temperature for 1 month. This material optimization strategy balances performance and cost, providing the possibility for large-scale application.
The convenience of multi-grain jelly self-supporting bags is reflected in multiple dimensions. Structurally, the bottom support design enables it to stand stably without an additional bracket, and the shelf display efficiency is increased by more than 30%; the nozzle structure realizes one-handed pouring and flow control to meet the needs of ready-to-eat scenarios. For example, the nozzle design with a screw cap can be opened and closed repeatedly for more than 20 times, and the sealing performance has no obvious attenuation.
The sealing system is the core of convenience. The zipper seal achieves multiple sealing through a toothed structure, and the user's operating force is ≤5N; the screw cap adopts a threaded anti-slip design, and the opening and closing torque is controlled between 0.8-1.2N·m, taking into account both sealing and ease of use. In addition, the transparent window design allows consumers to observe the state of the contents intuitively, reducing the time of purchasing decisions.
In terms of user experience, the smoothness of the material surface (Ra≤0.8μm) reduces the difficulty of cleaning, and even jelly residue can be easily wiped off. In terms of portability, the self-supporting bag can be folded to 1/3 of its original size, which is convenient for putting into a backpack or pocket, especially suitable for outdoor sports scenes.
The multi-grain jelly self-supporting bag has a wide range of applicable scenarios. In the home scene, its standing design saves more than 30% of refrigerator space; in the office scene, the nozzle structure is convenient for replenishing energy at any time; in the outdoor scene, the pressure resistance (≥60kg/1 minute) ensures transportation safety. Market research shows that consumers rate the convenience of self-supporting bags at 4.5/5 and the environmental protection at 4.2/5.
