The Lid Decides Whether the Drink Arrives

A coffee chain's reputation is decided at the cup opening. Too loose and the lid lifts under a full cup; too tight and baristas lose seconds on every drink. Dome height decides whether whipped cream survives; the sip hole decides whether the drink spills on a lap.

Shantou Longsheng Industry Co., Ltd. produces both sides of that equation: cups on cup making machines, lids on multi-station thermoforming machines, with molds made in-house in Shantou City, Guangdong Province.

Lid Types and What They Are For

• Flat lids with a straw slot for iced drinks and fruit tea
• Dome and high-dome lids for milk tea with toppings and for whipped drinks
• Cross-cut sip lids for hot coffee, opening on pressure without a plug
• Soup and bowl sealing lids for takeaway noodle and rice bowls
• Integrated hinged lids for single-piece cups that need no separate lid

Why the Pairing Matters More Than the Part

Cup rim diameter, rim bead radius and lid channel depth form a tolerance chain. When cup and lid come from different suppliers, each works to its own drawing, and the stack-up shows up as lids that pop off in a carrier or lids that crack when pressed. Longsheng forms cup and lid to a common specification, so the snap force is designed rather than discovered.

Venting is the second detail. A hot drink sealed with a lid that has no vent bulges and can lift at the seam. A correctly placed vent hole, punched in the forming station while the sheet is indexed, releases pressure without letting the drink escape.

Materials

PP is the default for hot lids and cups because it holds shape at serving temperature. PET and rPET give clarity for cold drinks; PLA suits chains under compostable-packaging commitments. Longsheng machines process PP, PS, HIPS, PVC, PET, PLA, PE and biodegradable sheet.

Volume, Changeover and Consistency

Chain beverage programmes change seasonally: a new dome for a summer drink, a new cup size for a limited offer. Multi-station thermoforming handles this because heating, forming, punching and stacking are independent stages, and a new lid profile is a tooling change. Cup machines are offered in three drive platforms — FS-8556, HSS-8556 and HAI-8556 — so output can be matched to the programme.

Longsheng was founded in 1998, operates a 30,000 square metre plant, holds 25 authorised patents (1 invention, 24 utility model) and is a high-tech enterprise.

For cup and lid development, visit the official website: https://www.stlongsheng.com