Sealed Bag Packaging
Stand-up pouch packaging, also known as back-seal pouch, is suitable for food, snacks, baked goods, frozen food, wet wipes, tableware, small hardware parts, and daily chemical products. It supports back-seal pouches, pillow-style packaging bags, automatic packaging rolls, and custom printing on composite films.
What is a middle-sealed bag packaging?
Middle-seal bag packaging is a common type of packaging method.Plastic flexible packaging formIt is also known as a back-seal bag or a pillow pouch in the industry. The bag has a longitudinal middle seal line on the back, with the top and bottom sealed horizontally through heat sealing, forming a sealed structure. The overall appearance is pillow-shaped, making it one of the mainstream bag types for high-volume automatic packaging in industries such as food, daily chemicals, and hardware.
WithThree-side sealed bagCompared to common bag types such as stand-up bags, octagonal-sealed bags, and zipper bags, the middle-sealed bag offers a simpler structure. The sealing line is concentrated at the center back, leaving the front side free from sealing edges, allowing for complete display of brand logos, product names, and graphics. Additionally, due to its simple structure, high material utilization, and fast bag-making speed, the middle-sealed bag packaging provides significant advantages in product lines where packaging costs and production efficiency need strict control.
HASUPACK provides middle-seal bags according to customers’ product dimensions, content characteristics, packaging machine model, and brand design requirements.Custom PackagingCustom back-sealed bags, pillow-shaped packaging bags, and automatic packaging roll film services. Supports composite film material selection, color gravure printing, digital proofing, transparent window openings, easy-tear notches, hanging holes, serrated sealing, and roll film specifications customization, covering the entire process from proofing to mass production delivery.
Advantages of Middle-Sealed Bag Packaging Process
High-speed automatic packaging with high efficiency
Stand-up pouches are typically formed continuously from a roll of film on an automatic packaging machine, suitable for high-speed bagging, filling, and sealing operations. They significantly improve packaging efficiency for bulk products such as bread, candies, cookies, wet wipes, and disposable tableware.
Full front display area
The heat-sealed edge of the middle-sealed bag is located at the center back, with no obvious sealing edge on the front side, allowing for a complete display of brand logo, product name, design patterns, and key selling points.
Simple structure, cost-effective
Compared to complex bag types such as eight-sided sealing bags, self-standing bags, and zipper bags, the middle-seal bag has a simpler structure, higher material utilization, and a mature production process, making it suitable for products that are cost-sensitive and have high shipping volumes.
Sealed and stable, with wide applicability
The middle-sealed bag forms a complete sealed structure through longitudinal sealing on the back and transverse sealing on the top and bottom. Different composite film materials can be selected based on the contents to achieve functions such as moisture-proof, oil-proof, oxygen barrier, light-blocking, and low-temperature resistance.
Can be paired with various materials and techniques
Custom options include transparent film, metallized film, aluminum foil film, pearlescent film, matte film, and glossy film. We also support custom processes such as color printing, partial transparent window openings, easy-tear notches, hanging holes, and serrated sealing.
Middle Sealed Bag Packaging Parameter Introduction
The following are the common technical parameter ranges for zipper bag, back-sealable bag, and pillow-type packaging bags. Specific dimensions, materials, thickness, film width, and functional processes can be customized according to your product requirements and packaging equipment parameters.
| Parameter Dimensions | Specification Range / Options | Description |
|---|---|---|
| Dimensions Specifications | ||
| Bag Width (Front Width) | 50 – 300 mm | Customizable based on product width, packaging machine forming size, and display requirements. |
| Bag Height (Finished Height) | 80 – 450 mm | Adjust according to product length, top and bottom sealing width, and filling space. |
| Back seal width | 8 – 20 mm | Central longitudinal heat-seal line on the back, with seal width adjustable according to the thickness of the film material. |
| Top and Bottom Sealing Width | 8 – 15 mm | Recommended food packaging ensures sufficient heat seal width to enhance sealing stability. |
| Roll Film Width | Customizable by bag width, backseal width, and equipment requirements | Suitable for automatic packaging equipment such as pillow-type packaging machines and vertical packaging machines |
| Roll Diameter / Core Diameter | Standard 3-inch / 6-inch Cylinders | The winding diameter and core size can be customized according to the customer’s packaging equipment requirements. |
| Material Combinations | ||
| Economic Type | BOPP/CPP、OPP/CPP、PET/PE | Suitable for bread, cakes, candies, biscuits and other common productsFood PackagingCost-effective |
| Standard Food Type | PET/PE、PET/CPP、BOPP/PE | Suitable for packaging of snacks, baked goods, wet wipes, tableware, and daily necessities. |
| Aluminum-coated moisture-proof type | PET/VMPET/PE、BOPP/VMPET/PE | Moisture-proof and light-proof packaging suitable for powders, granules, seasonings, tea bags, and dried foods. |
| High barrier type | PET/AL/PE、PET/AL/CPP | The aluminum foil layer blocks oxygen, moisture, and light, making it suitable for products with high shelf life requirements. |
| Puncture-resistant | PET/PA/PE、PA/PE | Suitable for packaging small hardware items, frozen food, products with sharp edges, or heavier contents |
| Transparent Display Type | Clear PET/PE, BOPP/CPP | Ideal for products that need to display their contents, such as bread, candies, cookies, wet wipes, etc. |
| Printing and Post-Processing | ||
| Printing Process | Offset Printing (Standard), Digital Printing (Small Quantity) | Offset printing is suitable for bulk orders; digital printing is ideal for small quantity proofs and quick testing. |
| Print Color Count | 1 – 10 Colors | Printable brand logo, product name, flavor information, barcode, and nutritional information table |
| Surface Treatment | Matte, Gloss, Metallic Film, Aluminum Silver, Partial UV | Choose different surface textures based on packaging positioning for food, daily chemicals, or gifts. |
| Sealing method | Back seal, middle seal, pillow-style top and bottom horizontal seal | Back longitudinal seal, top and bottom transverse heat seal, suitable for automatic packaging forming |
| Cutting Style | Flat opening, serrated opening, easy-tear opening | Ice cream, candy, cookies and other products can be sealed with a serrated closure, making them easy to open. |
| Functional Process | ||
| Easy-tear notch | Optional (U-shape / V-shape / Straight) | Suitable for packaging of candies, cookies, ice cream, wet wipes, and other products that require easy opening. |
| Clear Window | Optional (Circular / Elliptical / Striped / Irregular) | Suitable for showcasing food appearance, the window position can be customized according to the layout design. |
| Mounting hole | Optional (Round Hole / Euro Hole) | Suitable for supermarket hanger, convenience store display, or small household goods packaging |
| Moisture Barrier | Optional metallized layer, aluminum foil layer, or high barrier composite film | Suitable for products such as powders, granules, tea bags, seasonings, and dry foods. |
| Low-Temperature Resistance | Optional Low-Temperature Resistant Composite Film | Suitable for packaging of ice cream, ice milk, frozen snacks, and quick-frozen food |
| Applicable Products | ||
| Food Packaging | Candies, Cookies, Expanded Foods, Chocolate, Pastries, Seasonings | Suitable for high-volume automatic packaging, front display is complete, and the back middle-seal structure is clear. |
| Baking Packaging | Bread, cake, toast, egg tart, pastry | Commonly used for continuous packaging on a pillow-style packaging machine, suitable for transparent or color-printed effects |
| Frozen Food Packaging | Ice cream, frozen desserts, frozen snacks, quick-frozen foods | Optional low-temperature resistant film material can be selected, paired with serrated sealing or easy-tear opening. |
| Daily Necessity Packaging | Wet wipes, paper towels, disposable tableware, hotel supplies, cleaning products | Suitable for lightweight, bulk, and automated packaging requirements |
| Industrial Small Parts Packaging | Screws, nuts, electronic components, small tools, hardware accessories | Optional puncture-resistant composite film can enhance packaging strength and transportation stability. |
| Business Parameters | ||
| Minimum Order Quantity (MOQ) | Offset printing: 5,000 – 10,000 pieces; Digital printing: 500 – 1,000 pieces | Minimum order quantity is determined based on size, material, printing method, and production requirements. |
| Delivery Lead Time | First order: 15 – 25 days; reorder: 10 – 15 days | Delivery time will be confirmed based on the order quantity, printing process, and production schedule. |
| Sample lead time | Digital proof: 3 – 5 days; Print proof: 5 – 7 days | It is recommended to confirm the size, color, back seal position, and heat seal effect through a sample before mass production. |
| Customization Methods | Custom by drawing, custom by sample, custom by equipment parameters | We can design and produce according to the customer’s product size, packaging machine model, roll film specifications, and brand. |
Vacuum bag packaging applications
Bread / Cake
Stand-up pouch suitable for pillow-style automatic packaging, with a flat front panel for displaying product name, flavor, and brand information. Transparent or semi-transparent film allows for clear visibility of the product’s condition.
Candy / Snacks
Ideal for small-sized, high-frequency consumer products. Color printing enhances shelf visibility, and the back-seal structure facilitates high-speed mass production.
Ice Cream / Frozen Food
Commonly used for packaging of ice cream, ice milk, and frozen desserts. Optional low-temperature resistant composite film can be selected, paired with a serrated closure for easy consumer opening.
Wet Wipes / Disposable Products
Suitable for packaging daily necessities such as wet wipes, disposable chopsticks, spoons, forks, and tableware sets. The bag type is lightweight and offers high automatic packaging efficiency, ideal for large-scale supply.
Hardware Accessories / Component Packaging
Suitable for products such as screws, nuts, small parts, and electronic components. A more puncture-resistant composite film can be selected based on product weight and sharpness.
Household & Personal Care Products
Suitable for packaging of laundry pods, cleaning tablets, small-sized daily necessities, travel-sized products, etc. Can be designed with transparent window, hanging hole, easy-tear notch, and other functional features.
Case Study of Middle-Sealed Bag Packaging
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