Engineered to meet California's stringent structural requirements, food safety standards, and aesthetic sensibilities.
Analyzing regional packaging mandates, CPG growth, and the structural advantages of center-seal architecture.
The San Francisco Bay Area—spanning Silicon Valley, South San Francisco, and the East Bay—is the global capital of culinary and biotechnological innovation. From alternative meat startups to functional organic snack brands, local companies require flexible packaging that does more than hold a product. They demand barrier technologies that extend shelf-life without the use of chemical preservatives.
Dongfa Printing's back-sealing bags (also known as pillow pouches or middle-sealing bags) are engineered to meet these precise specifications, ensuring that fragile organic compounds and food items remain stable from filling lines to the shelves of Bay Area retailers.
Oakland and San Francisco host one of the most concentrated specialty coffee roasting networks in North America. For artisan coffee roasters, preserving volatile aromatic compounds and preventing oxidation is critical. Our 145μm Kraft paper and multi-layer laminate middle-sealing bags provide a complete barrier against UV light, oxygen, and moisture.
Featuring compatibility with integrated degassing valves and nitrogen-flushing technology, our back sealing bags ensure coffee grounds and whole beans maintain optimal peak flavor profiles over extended transit and shelf periods.
Also known as "pillow pouches" or "fin-seal/lap-seal bags," middle sealing bags are formed by sealing the two vertical edges of the film together on the back panel, followed by top and bottom horizontal seals. This design delivers several key packaging advantages:
The global market for flexible packaging is pivoting quickly toward mono-material structures and high-barrier recyclable configurations. In Western markets like California, regulations like SB 54 require producers to phase out hard-to-recycle multi-layer plastics. As a leading manufacturer, Dongfa Printing is at the forefront of this evolution. We engineer films that replace traditional non-recyclable multi-layered barrier structures with high-performance PP and PE mono-material substrates, ensuring our customers remain compliant with emerging environmental standards.
Technical parameters optimized for automated production lines and structural shelf-life protection.
At Dongfa Printing, quality control is backed by advanced data and automated processes. Our cleanrooms feature high-resolution in-line vision systems that inspect 100% of the film web at high speeds. These systems identify pinholes, seal variations, or printing misregistrations in real-time. Operating in strict alignment with GMP guidelines, we verify that every batch destined for the San Francisco market is free from chemical residues and physical defects, ensuring consistent performance on high-speed filling equipment.
Streamlined procurement, raw material security, and direct-to-port logistics for Northern California.
While domestic lead times in North America can often stretch to months due to raw material and labor shortages, our manufacturing facility in China provides a highly reliable alternative. By sourcing directly from our facility, San Francisco brands benefit from integrated material supply chains, rapid prototyping, and automated production scaling.
We maintain deep relationships with top-tier global polymer resin manufacturers, ensuring a steady supply of high-grade barrier films like EVOH, Nylon, and metallized PET. This vertical integration allows us to shield our clients from market price fluctuations and deliver cost-effective packaging solutions without compromising material quality.
We manage direct shipping routes to the Port of Oakland, offering efficient ocean and air freight options to the Bay Area. We handle all export customs clearance, documentation, and compliance checks, ensuring your custom packaging arrives directly at your San Francisco or East Bay warehouse without unexpected port delays.
35 Years of Dedication to Flexible Packaging Innovation
Dongfa Printing Co., Ltd. has over 35 years of professional experience in printing and packaging manufacturing. We provide all kinds of packaging, specialize in the development and production of various liquid packaging films and bags, suitable for use in pasteurization and retort steam sterilization processes, as well as different types of spout bags and sealing cup films. Base on the printing machine with online quality inspection equipment and GMP workshop, we adhered to excellent materials, professional production and strict quality control. We can provide you superior products and best service.
Since its establishment, Dongfa Printing has been committed to providing customers with efficient and high-quality printing services. Our business scope covers the entire process from design, plate making to printing and binding. Whether it's commercial printing or personalized customization, we can fulfill customer needs with our professional technical skills and attentive service.
Our company is dedicated to producing custom flexible packaging for food, medicine, daily-use products, and chemical products. We offer a wide range of products, including spout bags, retort bags, back sealing bags, three-side seal bags, stand-up pouches, quad-seal pouches, flat-bottom bags, zipper pouches, and customized roll films. We consistently use high-quality materials for professional production and strict quality control.
Our products are mainly exported to the Middle East, Southeast Asia, Africa, North America, and Japan, and have received widespread praise from customers. Dongfa Printing's corporate vision is to become a leading company in the printing industry. We strive for excellence, constantly innovate, and are dedicated to providing customers with better printing products and services. Additionally, we prioritize environmental protection and sustainable development, striving to reduce pollution and waste in the production process, and contributing to the harmonious development of society and the environment.
Our corporate values are "integrity, professionalism, innovation, and win-win." We uphold integrity as our foundation, professionalism as our basis, innovation as our driving force, and strive for win-win outcomes with customers, employees, and society. These values not only guide our business practices but also inspire our team to continuously move forward.
We have a professional and knowledgeable team ready to serve you. We sincerely welcome you to visit our company for further business and cooperation opportunities!
Helping brands navigate Proposition 65, FDA regulations, and environmental compliance.
Doing business in California requires complying with some of the most rigorous environmental and chemical safety standards in the world. For flexible packaging, this means staying current with updates to California Proposition 65, PFAS restrictions, and local waste management laws. At Dongfa Printing, we prioritize material safety, regulatory compliance, and eco-friendly manufacturing processes to support your brand's sustainability goals.
Every layer of our barrier films, adhesives, and inks is FDA-compliant for direct food contact. We conduct regular migration testing to ensure absolute safety for packaging applications ranging from ambient shelf-stable products to hot-fill, retort, and pasteurization conditions.
In line with California’s ban on intentionally added PFAS in food packaging, our formulas are regularly tested and certified PFAS-free. This ensures your brand is fully compliant with state laws and ready for retail distribution.
Our rotogravure printing processes utilize advanced inks that are free from lead, mercury, cadmium, hexavalent chromium, and phthalates, complying with CONEG heavy metal legislation and Proposition 65 requirements.
Technical insights and supply chain details to help guide your packaging decisions.
A middle seal (back seal) bag is formed from a single sheet of film wrapped into a cylinder, with the seal running vertically down the center of the back panel. This leaves the front and side gussets completely seamless for uninterrupted printing and branding. A 3-side seal bag is sealed on three edges, restricting seamless design space but offering flat display advantages for smaller retail packages.
Yes. Our back sealing bags and custom roll films are specifically engineered for high-speed automated VFFS lines. We supply film rolls with precise slip factors, friction coefficients (COF), and thermal sealing properties to ensure reliable, high-speed automated performance.
We offer high-barrier recyclable mono-material films (such as PE/EVOH-PE) and biodegradable Kraft paper structures (up to 145μm) that align with California's sustainability mandates. These packaging solutions provide excellent barrier properties while helping brands reduce their environmental footprint.
Once artwork is approved and plate-making is complete, production typically takes 15–20 days. Ocean freight to the Port of Oakland generally takes 18–25 days, while air freight options are available for rush orders, delivering within 5-8 business days.
Custom rollstock, spouted pouches, and high-performance sealing films for diversified product lines.
Trusted by brands globally for high-quality commercial packaging and production standards.
DongFa Printing
