Application and development of stand-up pouches in flexible packaging industry
People’s purchasing power for fast-moving consumer goods continues to grow, and the rapid development of the fast-moving consumer goods market has also led to the rise of the flexible packaging industry. Nowadays, the types and uses of packaging bags are very wide. At the same time, good packaging can also establish a high-quality image of the product, improve the competitiveness of the product, and thus promote product sales.
I. Types and application advantages of stand-up pouches
Clothing Packaging Stand-up Pouches
Food Packaging Stand-up Pouches
There are many packaging classifications for products. According to technical classification, they can be divided into moisture-proof packaging, waterproof packaging, mildew-proof packaging, fresh-keeping packaging, quick-freezing packaging, breathable packaging, microwave sterilization packaging, aseptic packaging, inflatable packaging, vacuum packaging, deoxidization Packaging, blister packaging, skin packaging, stretch packaging, retort packaging, etc.
The various packaging bags mentioned above are all made of different composite materials, and their packaging characteristics correspond to the requirements of different products and can effectively maintain the quality and stable functions of the products themselves.
Stand-up pouches are considered to be a classic of modern packaging, and it is also a relatively new form of packaging. It has certain advantages in many aspects such as improving product grades, strengthening the visual effect of shelves, carrying light, easy to use, waterproof, moisture-proof, oxidation-proof, and salability.
Stand-up pouches can be divided into five types: ordinary stand-up pouches, nozzle stand-up pouches, stand-up zipper bags, mouth-like stand-up pouches, and special-shaped stand-up pouches. Mainly used in fruit juice drinks, condiments, clothing, hardware and electronics, detergents, cosmetics and other products.
Products packaged in stand-up pouches are very convenient for consumers, because they are plastic packaging bags, which are light in weight and not easy to damage. In addition, the zipper/bone stand-up pouch can be reused, the spout stand-up pouch makes food pouring more convenient, and the exquisite printing can help the product attract the attention of consumers.
Stand-up bags are generally laminated with PET/FOIL/PET/PE structure, and can also have 2 layers, 3 layers and other specifications. Depending on the different products in the package, an oxygen barrier protective layer can be added as needed to reduce the oxygen transmission rate and extend the shelf life of the product.
Ordinary stand-up pouches and general stand-up pouches adopt the form of four sealing edges, which cannot be reclosed and repeatedly opened; stand-up pouches with suction nozzles are more convenient to dump or absorb the contents, and can be reclosed and opened repeatedly, which can be considered as stand-up pouches and stand-up pouches.
Combination of ordinary bottle mouth; mouth-like stand-up pouch combines the convenience of a stand-up pouch with a suction nozzle and the cheapness of an ordinary stand-up pouch, that is, the function of the suction nozzle is realized through the shape of the bag itself, but the mouth-like stand-up pouch cannot be repeated Sealing; Special-shaped stand-up pouches are new stand-up pouches of various shapes produced by changing the traditional bag shape according to the needs of the product, such as waist design, bottom deformation design, handle design, etc.
Ordinary stand-up pouches and general stand-up pouches adopt the form of four sealing edges, which cannot be reclosed and repeatedly opened; stand-up pouches with suction nozzles are more convenient to dump or absorb the contents, and can be reclosed and opened repeatedly, which can be considered as stand-up pouches and combination of ordinary bottle mouths.
The mouth-like stand-up pouch combines the convenience of a stand-up pouch with a suction nozzle and the cheapness of an ordinary stand-up pouch, that is, the function of the suction nozzle is realized through the shape of the bag itself, but the mouth-like stand-up pouch cannot be repeatedly sealed.
The special-shaped stand-up pouch is a new stand-up pouch of various shapes produced by changing the traditional bag shape according to the needs of the product, such as waist design, bottom deformation design, handle design, etc.
II. Three common quality problems of stand-up pouches
stand-up pouches common size
Leakage of the stand-up pouch
The reason for the leakage of the stand-up pouch mainly lies in the selection of composite materials and the strength of heat seal.
The material selection of the stand-up pouch is very important to prevent leakage, the purpose is to improve the peel strength between the outer layer and the middle barrier layer, the barrier layer and the heat seal layer material and the heat seal strength of the bag. Therefore, it is required that the surface tension of the composite surface of the film must be greater than 38dyn/cm; the low-temperature heat-sealing performance of the inner heat-sealing film is better, and the surface tension of the heat cover must be less than 34dyn/cm; Solid low-viscosity adhesive, high-purity organic solvent.
②Heat seal strength
Low heat seal strength is also one of the important factors affecting the leakage of stand-up pouches. When heat sealing, the matching relationship between heat sealing temperature, heat sealing pressure and heat sealing time should be adjusted. In particular, we should pay attention to the heat-sealing temperature of bags with different structures. Because the melting points of different types of plastic films are different, the heat-sealing temperature is also different; The layer is sheared by the heat-sealing knife in the high-temperature molten state, which reduces the sealing strength.
In addition, the four-layer seal at the bottom of the stand-up pouch is the most critical part, and the heat-sealing temperature, heat-sealing pressure and heat-sealing time can only be determined after full test verification.
In the actual production process, the stand-up pouch should be leak tested according to the different requirements of the contents. The simplest and most practical method is to fill the bag with a certain amount of air, heat seal the mouth of the bag, put it into a basin filled with water, and squeeze different parts of the bag with your hands. If no air bubbles escape, the bag is the sealing and airtightness of the air leak is good; otherwise, the heat-sealing temperature and pressure of the leaking part should be adjusted in time.
Stand-up pouches containing liquids should be treated with more caution. Squeeze and drop methods can be used to detect whether they are leaking, such as filling a certain amount of water in the pouch, sealing the mouth, and testing according to the pressure test method of GB/T1005-1998. The drop test method can also refer to the above-mentioned standards.
Uneven bag shape
Flatness is one of the indicators to measure the appearance quality of packaging bags. In addition to material factors, the flatness of stand-up pouches is also related to factors such as heat-sealing temperature, heat-sealing pressure, heat-sealing time and cooling effect. If the heat-sealing temperature is too high or the heat-sealing pressure is too high or the heat-sealing time is too long, the composite film will shrink and deform.
Insufficient cooling will result in insufficient shaping after heat sealing, unable to eliminate internal stress and cause wrinkles in the bag, so the process parameters should be adjusted, and the cooling water circulation system should work properly.
Symmetry not only affects the appearance of the stand-up pouch, but also affects its sealing performance. The most common asymmetry of the stand-up pouch is often reflected in the bottom material part. Due to improper control of the tension of the bottom material, the round hole on the bottom surface will be deformed or wrinkles will be generated due to the tension mismatch with the main material, and the heat-sealing strength will be reduced.
When the round hole of the bottom material is deformed, it is necessary to properly reduce the tension of the discharge and increase the waiting time for correction during heat sealing, so that the intersection of the four layers at the bottom of the bag can be fully heat-sealed.
In addition, the asymmetry of the bag shape will also be related to factors such as photoelectric tracking, feeding, cursor design, rubber roller balance, stepper motor or servo motor synchronization. This problem should be solved according to the specific operation of different products and different bag making equipment.
III. Two application examples of stand-up pouches
Successful application of special-shaped stand-up pouches
The function of adding zipper/bones is also to facilitate multiple unpacking. But the difference is that the way of resealing is zipper/bone strip, so this kind of design is not suitable for encapsulating liquid, but for the packaging of some dry items, such as: clothing, candy, dried fruit, chocolate, biscuits, jelly, tea, etc.
Triumph Packaging is a packaging bag supplier for famous brands such as ISAAC, Pams, Anchor, ENZI, etc. Triumph Packaging can dig deep into the needs of customers, and reasonably design specific solutions for product packaging upgrades, so that companies can truly use products more conveniently and safely , reduce costs, improve efficiency, improve product aesthetics, and more environmentally friendly needs. When the final supporting package is presented to the customer, the customer is also very satisfied.
Successful application of spout stand-up pouch
Now people’s living standards are constantly improving, and more and more people are used to washing with laundry detergent instead of washing powder. Because the laundry detergent is convenient and fast, it does not need repeated cleaning, saving time, labor and water. Laundry liquid packaging mainly includes bags and cans, and bagged laundry liquid packaging requires higher requirements than ordinary flexible packaging.
The requirements for bag firmness, ability to withstand liquid corrosion and penetration and heavy objects, drop resistance and scratch resistance, transportation safety and shelf display effects are all more stringent.
The laundry detergent packaging bag is a color printing composite structure, the most commonly used size is 2kg, and there are two common structures as follows:
For the film material selection of the above composite structure, the specifications and performance of double-drawn polyester PET and double-drawn nylon PA are all standardized.
Polyethylene PE is the key to the quality of laundry detergent packaging bags.
Most of the bagged laundry detergent is a stand-up bag, and a capped low-pressure polyethylene (HDPE) hard mouth is added to the stand-up bag to form a packaging bag with a suction nozzle.
In addition to the advantages of easy opening and multiple sealing in bottles, it also has the advantages of less consumption of packaging materials, high level of printing and packaging, storage of packaging materials, low transportation costs, and small amount of garbage disposal. It is known as environmentally friendly packaging. .
According to statistics, compared with the same capacity, the consumption of raw materials in bags can be reduced by more than 30%, the cost of storage and transportation of packaging materials can be reduced by more than 60%, and the amount of garbage disposal can also be reduced by more than 5 times.
For more detailed types or questions about stand-up pouches, please refer to: Stand Up Pouch – China Packaging Bag & Film OEM Factory (kxpack.com)
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