Fall

Target Client:​ High-end nut brands (mixed nuts, daily nut packs, holiday gift sets) Core Needs: Sorted Display & Aroma Isolation:​ Nuts come in all shapes (walnuts, cashews, pecans) and they’re fragile. Needed separate physical dividers to stop them from crushing each other or mixing smells during shipping. Premium Visuals:​ Ditch the “loud red and green” souvenir vibe. The packaging needed to signal “natural,” “organic,” and “affordable luxury.” Easy Access:​ As a sharing snack, it had to be easy to grab from. And once opened, the box should double as a desk organizer. Eco & Safety:​ Direct food contact means materials must be non-toxic. Also needed to align with the plastic-reduction trend. Project Background: Great Nuts Fear “Mixing,” Gifting Fears “Tackiness” We worked with a brand that sources nuts globally. Quality was top-notch, but their old packaging was holding them back: Messy Mix:​ Old packs dumped all nuts into one big bag, or used cheap plastic dividers. Customers kept getting crushed crumbs and couldn’t see what they were eating. Cheap Look:​ Clear plastic bags with a sticker made premium nuts look like bulk bin rejects. Not a gift you’d be proud to hand someone. No Staying Power:​ Tossed after eating. Zero brand retention. They wanted a box that displayed nuts like jewelry but still fit modern home aesthetics. Hanlong’s Solution: Where Orderly Aesthetics Meet Natural Texture Structural Design: Grid Partition + Flip-top Book-style Box Precision Inner Grid:​ Based on the green and pink cases shown, we designed fixed paper dividers inside. Individual Compartments:Split into 6 or 9 grids (customized to SKU count). Each cell sized to the nut — bigger for walnuts, smaller for pistachios. Solid Support:Divider height matches box walls. Keeps nuts from spilling out and protects them from stacking pressure during shipping. Wide-angle Flip Lid:​ 180° full open or large-angle flip. When opened, the lid folds flat backward, turning the whole box into a serving tray — perfect for sharing on a coffee table. Visual Style: Morandi Palette + Minimalist Layout Color Psychology: Matcha Green / Pea Green:Signals “natural,” “fresh,” “organic” — fits nuts perfectly. Dusty Pink / Rose Gold:Targets female buyers or Valentine’s/Mother’s Day gifts. Warm and refined. Raw Kraft:Emphasizes “original,” “additive-free.” Paired with hand-drawn illustrations for a vintage, earthy feel. Finishing Touches:​ On solid-color covers, we used only gold foil or embossing for the “NutBox” logo or brand name. Lots of negative space. Pure minimalist luxury. Production & Experience Food-Grade Safety:​ Inner box paper uses unbleached virgin pulp or coated paper. No fluorescent agents. Safe for direct food contact. Easy-Open Tear Strip:​ For fully sealed boxes, we added a hidden tear strip on the side. First opening doesn’t wreck the box structure. Delivery Results Price Premium:​ After the packaging upgrade, the same nut gift set sold for 30% more. Multiple companies picked it for Mid-Autumn/Spring Festival employee gifts. Repurchase Boost:​ Customers said “too pretty to throw away” — ended up using them for jewelry or desk supplies. Brand logo stays on their desk long-term. Breakage Dropped:​ Independent paper grid absorbed shipping shocks. Nut integrity went from 92% to 99%. Hanlong Engineer’s Tip Load-Bearing:​ Nuts are dense — a box can weigh 1–2 lbs. Bottom board must use high-grammage gray board with lamination, or the base will collapse when lifted. Moisture Protection:​ Nuts go soft fast in humidity (especially pecans and cashews). Recommend adding an inner foil bag or PE coating on the insert surface to block moisture. Dimensional Tolerance:​ Nut sizes vary by batch. When designing grids, leave 3–5mm extra on length and width. Avoids forcing oversized nuts in or having small ones rattle around.

Target Client:Mid-to-high-end light meal brands, corporate catering suppliers (focused on high-AOV set meals, picnic scenarios, and business meeting meals) Core Needs: Dry-Wet Separation & Odor Control:Set meals typically include rice/staple, hot dishes, cold plates, soups, and sauces. Must solve soup spills and flavor transfer caused by hot-cold food contact, which degrades taste. Transit Stability:During delivery or customer pickup, boxes easily come apart or internal containers shift, resulting in a “disaster upon opening.” Visual Premium:Break away from the cheap foam lunchbox image, boost perceived value through packaging design, making customers feel it’s worth every penny. Eco Trend:Reduce plastic use, aligning with modern F&B brands’ sustainability philosophy. Project Background: Great Food, Ruined by “Messiness” We partnered with a health-focused Japanese-style set meal brand. Their R&D was strong, but packaging had always been the weak link: Severe Odor Mixing:Previous packaging simply stuffed several round bowls into a large carton with no fixation. By the time it reached customers, curry aroma had contaminated the fruit, and rice was soaked through with sauce. Lack of Ritual:Opening the box felt like opening a parcel — zero aesthetics. Customers had no desire to photograph or share it on social media, resulting in zero organic buzz. Scenario Limitations:Due to flimsy, leak-prone packaging, many companies hesitated to order their lunches as business meeting meals, fearing it would hurt their professional image. The brand wanted a packaging solution that could stably hold all food items like a “serving tray” while being directly presentable at the dining table — a truly “all-in-one” experience. Hanlong’s Solution: Fusion of Functional Zoning & Visual Aesthetics Structural Design: Custom Food-grade White Card Insert + Integrated Mailer Box Precision Die-cut Insert:This was the core highlight. Referencing the green and yellow cases shown in the images, we designed a food-grade white card insert based on the exact dimensions of tableware (round bowls, square containers, long nori boxes). Lock-in Positioning:Each cavity features precision cutouts. Bowls snap in and stay put — even with vigorous shaking during transit, nothing shifts. Height Differential Design:Soup bowls sit slightly lower; staple sections sit slightly higher. This height difference prevents the lid from pressing against food while making items easier to grab. Reinforced Mailer Box The outer box uses high-grammage kraft paper, white card, or corrugated board. The bottom features a self-locking structure with strong load-bearing capacity — fully loaded boxes won’t deform when carried. Visual Style: Illustrative Storytelling + Fresh Color Palette Inside-lid Canvas:Utilizing the large flat area inside the mailer box lid, we printed exquisite brand illustrations. The moment customers open the box to eat, the first thing they see is a beautiful visual, instantly boosting appetite and mood. Color Psychology: Warm Yellow:Stimulates appetite, conveying warmth and satisfaction. Fresh Green:Communicates health, organic, and freshness. Retro Orange:Evokes energy, gathering, and outdoor vibes. Production & Sustainability All-paper Solution:​ Inserts are made entirely of white card, fully biodegradable. Compared to plastic blister trays, although unit cost is slightly higher, brand favorability increases dramatically. Flat-pack Shipping:Outer boxes and inserts ship in folded flat form, drastically saving warehouse space and freight costs. Delivery Results Satisfaction Rate Surge:After the new packaging launched, negative reviews mentioning “soup leaks” and “odor mixing” dropped to zero. The most-used customer review words became “exquisite” and “straight out of a Japanese drama.” Social Amplification:Thanks to the beautiful inside-lid illustrations, Instagram UGC volume tripled, turning packaging into a free advertising channel. B2B Order Growth:With stable structure and premium appearance, the brand successfully secured afternoon tea and meeting meal contracts with multiple corporations. Hanlong Engineer’s Tip Oil & Water Resistance:Even with an all-paper package, inserts in direct contact with food must undergo oil and water resistance treatment (usually PE coating). For hot soups or heavily oiled dishes, we recommend double-sided coating to prevent the paper insert from softening and collapsing. Ventilation Holes:For freshly cooked hot food (like fried chicken or stir-fried rice), complete sealing creates condensation that turns food soggy. We recommend designing micro-ventilation holes on the box sides or hidden areas of the lid to maintain crispiness. Cutlery Slot:When designing inserts, never forget to reserve space for chopsticks or a spoon! Many designers only account for food containers, leaving nowhere for cutlery — forcing it to awkwardly rest on the lid, which drastically degrades the experience.

Target Client:Mid-to-high-end beauty/perfume brands (focused on holiday limited editions and couple gifting scenarios) Core Needs: Mixed Loading Challenge:Gift boxes needed to hold both “hard products (perfume bottles/lipsticks)” and “soft decorations (fresh flowers/envelopes/greeting cards)” simultaneously, with zero crushing or damage between the two. Ritual Atmosphere:As a Valentine’s Day gift, the unboxing experience had to be full of surprises — not sloppy like a regular shipping carton. Ready-to-Gift Attribute:The packaging itself had to be exquisite enough that customers could hand it over directly without secondary wrapping, saving time and effort. Texture Matching:Materials needed to match the premium feel of fragrances and cosmetics, avoiding cheap cardboard that would drag down the product’s perceived value. Project Background: Great Gifts Fear “Messiness,” Ritual Fears “Interruption” We partnered with a U.S.-based perfume brand that launched limited-edition gift boxes every Valentine’s Day, but their old packaging kept running into trouble: Product Shifting:Perfume bottles and fresh flowers were mixed together. During transit, bottles would rattle and crush petals, or flower sap would stain the bottles — driving up complaint rates. Cheap Texture:Ordinary cardboard inserts couldn’t secure irregularly shaped bottles. Upon opening, products would be tilted at odd angles, completely lacking that “gift feel.” Tedious Assembly:Fresh flowers needed separate wrapping before being placed inside. Labor time was excessive, and during peak Valentine’s Day order surges, shipments were constantly delayed. The brand needed a custom box that could “perfectly zone” items while making customers “fall in love at first sight,” directly solving gifting pain points. Hanlong’s Solution: Dual Upgrade of Zoned Fixation & Sensory Experience Structural Design: 2-in-1 Zoning + Magnetic Closure Independent Compartmentalized Insert:For the “product + flower/envelope” combo, we designed a custom EVA foam insert. Product Zone:Precision-molded to fit perfume bottles or lipsticks, embedded with black velvet lining — both anti-slip and visually premium. Decor Zone:Reserved independent space for flowers or envelopes. Height is slightly lower than the product zone to prevent the lid from crushing decorations. Magnetic Flip-top Design:Used strong magnetic closure with a crisp “click” sound upon opening, adding an auditory ritual to unboxing. The inside of the lid can feature hot-stamped brand logos or love notes, maxing out the surprise the moment it opens. Visual & Tactile: Morandi Color Palette + Specialty Paper Finishes Color Selection:Referencing the case images, we chose low-saturation Morandi pink/blue/green paired with a matte finish, conveying a gentle, romantic Valentine’s vibe that won’t go out of style. Tactile Upgrade:The outer box uses soft-touch or velvet paper — smooth as skin to the fingertips. The interior features black velvet lining, creating a strong contrast with products to highlight their delicacy. Production Efficiency Boost Pre-assembled Inserts:Inserts and outer boxes are pre-glued and fixed. Workers simply place products and decorations, then close the lid. Single-box assembly time is reduced to under 30 seconds, drastically improving peak-season shipping efficiency. Delivery Results Complaint Rate Dropped 90%:The zoned design completely solved product-flower mutual damage. Transit damage rate fell from 8% to below 0.5%. Repurchase Rate Increased:Customers described it as “unboxing a treasure.” Social media photo shares surged, and post-holiday repurchase rates rose by approximately 25%. Premium Pricing Power:Thanks to the exquisite packaging, the gift box sold at a 40% higher price than previous ordinary versions — yet still sold out, becoming the Valentine’s Day bestseller. Hanlong Engineer’s Tip Insert Height:The decor zone (flowers/envelopes) must be at least 5mm lower than the product zone to prevent the lid from crushing decorations upon closure, which would ruin the unboxing experience. Moisture Protection:Fresh flowers contain water and may cause moisture damage to the paper box over time. We recommend adding a thin PE film barrier at the bottom of the decor zone, or using preserved flowers/dried flowers instead of fresh cuts to extend the box’s shelf life.

Target Client:U.S.-based craft breweries, fruit wine/sparkling wine brands (focused on brewery pickup, farmers’ markets, and foodservice delivery) Core Needs: Extreme Load-Bearing:A 6-pack of glass bottles is extremely heavy, and liquid creates momentum when shaken. Ordinary paper boxes often suffer from handle breakage or bottom puncture. Portable Experience:As takeaway packaging, it must be easy to carry with one hand without cutting into the hand, suitable for outdoor picnics, parties, and other scenarios. Display & Protection:Must showcase bottle labels to attract attention while preventing bottles from colliding and breaking. Eco-Friendly Image:Alcohol consumers prefer natural materials and reject excessive plastic packaging. Project Background: Great Beer Fears a “Broken Handle,” Takeaway Becomes a Challenge We partnered with a craft brewery whose signature beers were customer favorites, but their takeaway packaging had always been a pain point: Broken Handles:Previous packaging used single-layer corrugated to save costs. As soon as customers lifted a heavy load, the handle would snap — there was even an embarrassing incident of “spilled beer” right at the brewery entrance. Bottle Collisions:No dividers between bottles meant glass clinked against glass during transit. The sound was nerve-wracking, and it often led to micro-cracks in the bottles. One-Dimensional Scenes:The old packaging looked too much like an “industrial crate,” lacking design appeal. Customers were reluctant to carry it to parks or restaurants, limiting consumption scenarios. The brand wanted a custom package that could handle 6 heavy bottles while doubling as a “photo prop” on outdoor lawns. Hanlong’s Solution: Structural Reinforcement & Scenario-Based Design Structural Upgrade: Double-Layer Stress Distribution + Independent Dividers Reinforced Handle:Referencing the arched handle structure shown in the images, we applied local double-layer mounting reinforcement at stress points and optimized die-cut rounded corner arcs to distribute hand pressure. It can hold 10kg without cutting into the hand. Cross-Shaped Divider Insert:Designed a full-paper cross divider inside the box, completely isolating all 6 bottle positions. This not only prevents glass-on-glass collisions but also uses the resilience of paper to form a cushioning layer, replacing foam plastic. Visual Style: Retro Illustration + Kraft Paper Texture Material Selection:Used high-grammage kraft paper or white cardboard, preserving the natural paper grain to convey brand values of “handcrafted brewing” and “natural ingredients.” Graphic Design:Referencing the case images, we used vector illustrations of wheat stalks, hops, lemon slices, and other elements. This style has exceptional texture under outdoor sunlight, making it perfect as a “mobile advertisement.” Production Efficiency Boost One-Second Setup:Adopted an auto-bottom structure. Boxes ship flat and can be popped open and locked in one second, drastically saving packing time during the brewery’s busy hours. Delivery Results Zero Complaints:​ After the new packaging was deployed, complaints about “broken handles” and “broken bottles” disappeared completely. Social Sharing:​ Thanks to the beautiful design and outdoor-friendly format, Instagram saw a flood of user photos carrying the box at campsites and barbecues, significantly boosting brand exposure. Channel Expansion:​ With its outstanding portability, the brand successfully entered the refrigerated shelves of multiple high-end supermarkets. Retailers loved the neat display and damage-resistant packaging. Hanlong Engineer’s Tip Water Resistance:​ Ice-cold beer bottles produce condensation on the surface, and ordinary paper softens and collapses when wet. We recommend applying a water-based varnish or matte lamination on the paper surface — eco-friendly and effectively waterproof and oil-resistant. Handle Height:​ Handle height design requires careful consideration. Too high causes swaying; too low risks hitting the bottle caps. We recommend an arched handle height 2–3cm above the bottle cap, ensuring fingers don’t touch the cap hygiene zone when carrying. Load-Bearing Testing:​ For boxes carrying liquids, dynamic load-bearing tests are essential. Beyond static suspension, you must simulate the up-and-down motion of walking to ensure glue joints and paper fibers won’t suffer fatigue failure.

Target Client:A well-known coffee Europe brand with 50+ offline stores across Europe (not purely e-commerce; primarily relying on in-store sales and local delivery). Core Needs: Mixed Loading Safety:​ Gift boxes needed to hold both “soft-packaged coffee beans/drip bags” and “hard ceramic mugs/glass pots” simultaneously. Shelf Display Advantage:​ Packaging had to look great, “stand firm” on store shelves, and visually communicate “high-quality coffee” to reduce staff selling effort. Cost Control:​ As a high-volume souvenir item, per-unit packaging cost needed to stay within a reasonable range — no over-packaging. Eco-Compliance:​ The brand’s core value is “green and organic.” Packaging materials must be fully recyclable, with zero plastic foam. Project Background: Great Coffee Fears “Collisions,” Great Design Fears “Hiding” The brand had previously launched a “Coffee + Mug” gift set, but ran into major trouble in sales and after-sales: High Complaint Rate:​ Due to poor insert design, mugs rattled inside the box. The breakage rate on arrival hit 5%, and often the mug would puncture adjacent coffee bean bags, causing leaks. Poor Display:​ For safety, the old box was fully enclosed. Customers in-store couldn’t see the bean color or mug design, relying solely on staff descriptions — conversion rates were low. Low Assembly Efficiency:​ The old insert required manual folding and gluing. During peak season, factory assembly costs skyrocketed, delaying shelf stocking. The brand needed a solution that could “show off” the products, cradle fragile items like a champ, and be suitable for mass production. Hanlong’s Solution: Balancing Visual Transparency with Physical Protection Structural Design: Window Display + Full Pulp Molded Insert Precision Windowing:​ Referencing the design shown, we created a large transparent PET window (or die-cut opening) on the box lid. This lets customers see the rich SKU combo inside (beans, mug, spoon) at a glance, boosting purchase desire while reducing print area and cutting costs. Custom Pulp Molded Insert:​ To solve the “soft + hard” pain point, we ditched traditional foam plastic and designed a full pulp molded insert. Zoned Fixing:​ Each compartment was molded to the product’s shape — mug slots feature thickened buffer rings; bean slots are snug and form-fitting. Suspension Design:​ Mugs are locked in a suspended position, not touching the box bottom, greatly improving shock resistance. Visual Style: Minimalist Lines + Earth Tones Illustration Style:​ Single-color line art depicting coffee pots, beans, steam, etc., paired with generous white space or dark green/dark brown backgrounds. This creates a “old-school coffeehouse” professional vibe, perfectly matching the brand’s store decor. Tactile Finishes:​ Embossing (letterpress) on the logo and key text simulates the granular feel of coffee beans or paper texture, adding warmth to every touch. Production Efficiency Boost One-Piece Forming:​ The outer box uses a mailer box structure — no glue needed, machine pre-creased. Inserts are direct mold-formed. Workers need just 3 steps to assemble and place products, significantly improving packing speed. Delivery Results Zero Breakage:​ Thanks to precision insert locking, ceramic mug transport damage dropped from 5% to nearly 0%. Complaints plummeted. Sales Boost:​ After the packaging update, in-store organic sales increased by ~20% thanks to improved product visibility, making it a Top 3 souvenir item of the quarter. Brand Premium:​ Customers called it “a box too good to throw away.” Many repurpose it as a storage container, keeping the brand logo visible in their homes long-term. Hanlong Engineer’s Tip Window Placement:​ Avoid placing windows on load-bearing edges, as this compromises box compression strength. If a large window is necessary, we recommend high-strength E-flute or F-flute corrugated. Odor Isolation:​ When mixing coffee beans with ceramic mugs, note that coffee aroma can be absorbed by the paper box. We recommend sealing beans in an outer foil bag — this preserves freshness and prevents scent transfer to the mug. Size Adaptation:​ Coffee gift boxes usually contain multiple SKUs. Always have the client provide precise 3D dimensions of all products (including the inflated thickness of packaging bags). Insert design should allow a 1–2mm clearance — too tight makes packing difficult; too loose fails at shock absorption.

Zielgruppe: Mittel- bis hochpreisige Hautpflege-/Make-up-DTC-Marken in den USA (mit Fokus auf limitierte Weihnachtseditionen) Grundbedürfnisse: Weihnachtsritual: Gehen Sie über den langweiligen Ansatz „Produkte in einen großen Karton gestopft“ hinaus und steigern Sie die Kundenbindung durch ein Adventskalenderformat. Strukturelle Innovation:​ Es wurde ein Design benötigt, das 24 einzelne Fächer anzeigt und sich elegant wie ein Buch aufklappen lässt (in Anlehnung an den Doppeltür- oder Klappdeckelstil, der in den Bildern gezeigt wird). Visuelle Wirkung: Präzise Druckfarben, die zur Weihnachtsstimmung passen (Rot, Grün, Gold), mit einem hochwertigen Eindruck für das Markenlogo. Montageeffizienz: Bei 24 kleinen Schubladen plus einem Umkarton waren die Kosten für die manuelle Montage extrem hoch, sodass eine strukturelle Optimierung erforderlich war, um den Arbeitsaufwand zu reduzieren. 1. Projekthintergrund Im vierten Quartal des letzten Jahres nahmen wir Kontakt zu einer kalifornischen Hautpflegemarke auf. Sie wollten einen Weihnachts-Adventskalender auf den Markt bringen, aber ihre bisherigen Muster bereiteten ihnen Kopfzerbrechen: Mangelhafte Konstruktion: Kleine Schubladen verformten sich bereits nach wenigen Zügen, klemmten manchmal sogar, was zu einer miserablen Benutzererfahrung führte. Farbabweichung beim Druck: Das klassische „Weihnachtsgrün“ wirkte dunkel und billig und rechtfertigte den Preis von fast 100 Dollar in keiner Weise. Montage-Albtraum: Das Werk meldete, dass diese Mehrkammerboxen zu arbeitsintensiv seien, was die Mindestbestellmenge (MOQ) in die Höhe trieb. Ihr Ziel war klar: eine „Instagrammable“-Kalenderbox zu kreieren, deren Nutzer nicht widerstehen konnten, sie zu filmen und auf TikTok zu teilen. 2. Hanlongs Lösung 1) Strukturoptimierung: Von „erzwungener Passform“ zu „seidig glatt“ Für die in den Bildern gezeigte Doppeltür-/Klappdachkonstruktion haben wir zwei wesentliche Anpassungen vorgenommen: Verstärkungsrippenkonstruktion: An den Belastungsbereichen der 24 kleinen Schubladen wurden zusätzliche, verdeckte Verstärkungspunkte angebracht, um sicherzustellen, dass sie sich auch bei wiederholtem Herausziehen nicht verformen. Doppelter Verschluss mit Magnet und Schleife: Der Umkarton wird mit starken Magneten und einer Schleife verschlossen (siehe Abbildung). Dies gewährleistet einen sicheren Versand und trägt gleichzeitig zum Auspackerlebnis bei. 2) Visuelle Restaurierung: Pantone-Farben + Spotlackierung Sonderfarbendruck: Auf Standard-CMYK wurde verzichtet; stattdessen wurden Pantone-Sonderfarben für das Weihnachtsrot und das Vintage-Grün verwendet, um satte, kräftige Farbtöne zu erzielen. Taktile Veredelung: Auf das Logo und die Zahlen wird eine Heißprägung (Folie) oder eine Prägung aufgebracht, wodurch ein deutlicher haptischer Unterschied entsteht, der mit den Fingerspitzen gefühlt werden kann. 3) Produktionseffizienz Vorfalttechnologie: Sowohl der Außenkarton als auch die inneren Gitter wurden mit maschinell vorgefalzten Linien versehen, sodass die Mitarbeiter sie einfach einstecken und montieren konnten. Dadurch wurde die Montagezeit pro Karton um ca. 30 % reduziert. 3. Lieferergebnisse Social-Media-Hit: Das Unboxing-Video, das die Marke auf TikTok veröffentlichte, erzielte Hunderttausende von Aufrufen, und die Suchanfragen nach dem Stichwort „Unboxing“ schnellten in die Höhe. Verkaufserfolg: Die erste Charge war in weniger als zwei Wochen ausverkauft und avancierte damit zum Top-1-Produkt des Jahres. Keine Beanstandungen: Dank der strukturellen Verstärkung gab es so gut wie keine Beanstandungen bezüglich Transportschäden und klemmender Schubladen. 4. Tipp eines Hanlong-Ingenieurs Die Einhaltung der Toleranzen ist entscheidend: Werden die Toleranzen der 24 Fächer nicht streng kontrolliert, weicht die Gesamtgröße erheblich ab, sodass die Box nicht mehr in den Umkarton passt. Wir halten die Toleranz eines einzelnen Fachs üblicherweise innerhalb von ±0,1 mm. Materialauswahl für die Innenschale: Aus Gründen der Umweltfreundlichkeit und Kosteneffizienz empfehlen wir gefaltete Kartoneinsätze anstelle von Kunststoffblistern. Bei einer gut durchdachten Schnappverschlusskonstruktion ist die Stabilität genauso gut wie bei Kunststoff. Planen Sie im Voraus: Weihnachtskartons erfordern aufwendige Verfahren wie Heißfolienprägung und Sonderfarben, wodurch sich die Produktionszeit um 2–3 Wochen im Vergleich zu Standardkartons verlängert. Wir empfehlen Ihnen daher, Ihre Bestellung mindestens 3 Monate im Voraus aufzugeben.