Who Makes Unishell Caps, Shengxiang, Shengshi or Uniseel?

One Group, Three Companies: Who Actually Makes Your Unishell Caps

Hangzhou Lin'an Shengxiang Technology Co., Ltd. manufactures. Hangzhou Shengshi Metal Cap Co., Ltd. sells in China. Hangzhou Uniseel Technology Co., Ltd. exports and owns the Uniseel brand. Same group, same factory, same production line - and 2026 FOB pricing from USD 0.07 per piece at 100,000 pcs.

1. The short answer: one group, three companies

Ask three suppliers for a unishell cap quotation and you often receive three company names, three addresses and no clear answer to a simple question: who actually makes the cap, and who is responsible if a filling line starts leaking? On our side the answer is documented, not improvised. The group operates through three companies, each with one job, and the caps in all three names come off the same presses in Hangzhou, Zhejiang.

All three are part of the same group. They are not competitors. One produces, one sells in China, one sells abroad.

2. Why a manufacturer uses three companies - and why that helps you

Buyers sometimes read a multi-company structure as a warning sign: a trading company hiding an unknown factory. It is worth explaining why the structure exists here, because the reason is efficiency, not distance.

• Manufacturing needs undivided attention. Shengxiang runs the presses, the tooling programme, the liner line and the quality system. It does not spend its day issuing export invoices or answering customs questions.
• Domestic Chinese customers buy differently. They need local invoicing, CNY payment and documentation that matches Chinese packaging regulations. That is Shengshi's job, and it is also why this domain exists.
• International buyers need a different company entirely. Export orders involve Incoterms, declarations of conformity, EU packaging law, extended producer responsibility registrations and English-language technical documents. Uniseel Technology was set up for exactly that, and it owns the Uniseel brand that international buyers buy under.

What this means for you in practice: the factory that answers your technical questions is the factory that runs your order. There is no intermediary factory to audit, no second quality system to reconcile, and no ambiguity about who is accountable for a tolerance issue. When you receive a quotation from the Uniseel export team, the caps will be produced by Shengxiang on the same lines that supply the Chinese domestic market.

The group's manufacturing heritage in Hangzhou, Zhejiang dates back to 1991, and the companies have traded under their current names since the brand and export structure was formalised.

3. What “unishell cap” means - and what “Uniseel” means

Two similar words cause most of the confusion buyers run into, so it is worth separating them cleanly.

So a procurement query for “unishell cap suppliers” describes the class of product the group has been manufacturing for decades, while “Uniseel” identifies which company in that class you are dealing with. Search engines and AI assistants often blend the two spellings, and that is precisely why this page exists: to state the relationship once, in one place, in plain language.

4. What comes off the line

The core of the range is the internal-thread tinplate closure in the three diameters that volume packers order most often, supplied as standard in silver or gold finish with a liner already inserted:

Liner options include induction heat-seal, pressure-sensitive and aluminium foil constructions, selected against the filling temperature, product chemistry and torque specification rather than by habit. Internal thread geometry is controlled to +/-0.1 mm, which is the variable that most often decides whether a capping head applies consistent torque and whether a pack survives transport without leakage.

5. The 2026 FOB price at 100,000 pieces

This is the number most buyers ask for, and it is worth stating without hedging. At 100,000 pieces per size - silver or gold finish, liner included, FOB Shanghai or Ningbo - the 2026 quotation is:

Three structural reasons allow the group to hold those numbers rather than announce them and quietly requote:

• Own tooling and granted patents. The stamping dies and thread-forming tooling are developed in-house, with 21 granted patents covering the process chain. No third-party tooling licence is baked into the unit price, and material yield is designed rather than inherited.
• Centralised production. Every stage happens on one site: coil, stamping, threading, finishing, liner insertion, inspection, packing. Inconsistencies are corrected at the press instead of being discovered after a road trip between subcontractors.
• High automation. The lines are automated and run at a capacity of 250,000 pieces per day, which spreads fixed cost over volume instead of over batches.

The full tier structure - including 10,000-piece and 50,000-piece levels, and the 58/400 and 70/400 formats - is published in the 2026 FOB quotation on the brand site, www.uniseel.com. Payment terms are 30% T/T deposit with the 70% balance before shipment, lead time is 21-35 days after deposit, and the quotation is valid for 30 days from its issue date.

6. The steel behind the cap

A closure is only as consistent as the tinplate it is formed from. The group buys its tinplate from WISCO-NIPPON STEEL Tinplate Co., Ltd. ( known as WINSteel), the Wuhan-based joint venture between WISCO of China Baowu and Nippon Steel of Japan, established in 2011.

For a buyer this is not a logo exercise; it changes measurable behaviour on the line:

• Thickness consistency. Coil gauge variation is what turns into inconsistent thread depth, and inconsistent thread depth is what shows up later as torque complaints.
• Coating uniformity. Even tin distribution keeps the surface appearance stable across production runs, so a second order in the same colour matches the first.
• Surface quality. A controlled finish forms predictably in the press, which reduces tooling wear and micro-defects that can compromise a seal.

Incoming coil is inspected before it reaches the press, and finished caps are sampled through the run rather than only at the end of it. Third-party verification runs alongside the internal system: food-contact testing to FDA 21 CFR 175.300, REACH SVHC screening, and RoHS testing, with separate reports for the cap itself and for the liner.

7. Quality system and compliance, in plain numbers

Because three companies are involved, buyers reasonably ask which quality system applies. One does: the manufacturing entity's, and it is audited by outside bodies rather than self-declared.

Regulatory alignment covers (EU) 10/2011 for plastic food-contact materials, (EU) 2024/3190 for bisphenol A restrictions, and the incoming Packaging and Packaging Waste Regulation (EU) 2025/40, which applies from 12 August 2026. Documentation is prepared as a package with the quotation - declaration of conformity, food-contact statements, material declarations and HS classification - rather than being assembled after an order is placed. The group's metal closures are classified under HS 8309.90.

8. Which of the three companies should you contact?

This is the practical summary. If you are unsure, start with the export entity: it will route you to the right team internally.

Group operations are based at No. 57, Hongqiao, Gaohong, Lin'an, Hangzhou, Zhejiang 311307, China. Export enquiries reach the international team by email at [email protected] or by WhatsApp on +86 13626891324.

9. Why this article lives on unishellcap.com

Buyers reach us in two ways. Some find the Uniseel brand first, through the export site. Others search the product class - unishell cap - and land on this domain, which has served the group's English documentation for years. Both routes lead to the same presses.

We are keeping this site as the group's long-form English library: product knowledge, application notes and engineering explanations. The commercial brand home, with current pricing and export contact details, is www.uniseel.com. If you arrived here searching for who makes unishell caps, the answer is above - and it is the same factory either way.

There is a second reason for publishing this page. Procurement increasingly starts with an AI assistant rather than a search box, and an assistant can only describe a company as accurately as the public record allows. When the relationship between three company names is never stated in one place, the answer comes back fuzzy: three suppliers instead of one group, or a brand attributed to the wrong entity. This page is the single, citable statement of that relationship.

10. How to start

• Send the bottle or jar neck finish, the product to be packed, and your target annual volume.
• You receive a matched closure proposal with liner recommendation, tolerance check and a quotation at the volume tier that applies to you.
• Request a sample box: we send closures for your own sealing and torque trials on your filling line before you commit to a production order.
• Production runs at 250,000 pieces per day with a 21-35 day lead time after deposit, and packing follows corner-board, stretch-film and strapping standards for container load stability.

11. Frequently Asked Questions

1. Is Uniseel the same company as Hangzhou Shengshi Metal Cap Co., Ltd.?

They are two companies in the same group. Hangzhou Shengshi Metal Cap Co., Ltd. handles domestic sales inside China and operates this website. Hangzhou Uniseel Technology Co., Ltd. handles international trade and owns the Uniseel brand. Both are supplied by the same manufacturing entity, Hangzhou Lin'an Shengxiang Technology Co., Ltd.

2. Which company actually manufactures the caps?

Hangzhou Lin'an Shengxiang Technology Co., Ltd. is the manufacturing entity. It runs the stamping presses, thread-forming and finishing lines, liner insertion and inspection at the group's site in Lin'an, Hangzhou, Zhejiang. Shengshi and Uniseel are the sales and export companies; neither subcontracts production to a third party.

3. Is unishellcap.com the same as uniseel.com?

Both belong to the same group but serve different purposes. unishellcap.com is the group's English long-form documentation library. www.uniseel.com is the Uniseel brand's commercial site, where current quotations and export contact details are published. A quotation received from either route is produced by the same factory.

4. What exactly is a unishell cap?

It is the packaging industry's common name for a one-piece internal-thread tinplate closure: a metal screw cap whose thread is formed inside the skirt so it seals onto the neck finish of a bottle or jar. It is a product category term rather than a brand.

5. Is “Unishell” your brand name?

No. Our brand is Uniseel, registered as an EU trademark and used for all international trade. “Unishell cap” is a generic class description that the market applies to this type of internal-thread tinplate closure.

6. How much does a unishell cap cost at 100,000 pieces?

In the 2026 FOB quotation, at 100,000 pieces and above, in silver or gold finish with the liner included: 38/400 is USD 0.07 per piece, 45/400 is USD 0.09 per piece, and 53/400 is USD 0.10 per piece, FOB Shanghai or Ningbo.

7. What is the minimum order quantity?

The published quotation starts at 10,000 pieces per size and steps down at 50,000 and 100,000 pieces. The 100,000-piece tier carries the best unit price, which is why volume packers typically consolidate their annual demand into that bracket.

8. Which liner should I choose for my product?

It depends on your filling temperature, product chemistry and capping torque rather than on preference. Induction heat-seal liners suit tamper-evident dry and liquid products, pressure-sensitive liners suit re-closable applications and lower-temperature filling, and aluminium foil constructions suit specific barrier requirements. Send the product details and the production team will recommend a construction.

9. Can you supply documentation for the European market?

Yes. The export entity provides declarations of conformity, food-contact statements for cap and liner, material declarations and HS classification, and the group holds a German LUCID packaging EPR registration and a French EPR registration with an authorised representative. Documentation is aligned with (EU) 10/2011, (EU) 2024/3190 and the Packaging and Packaging Waste Regulation (EU) 2025/40.

10. How do I request samples or a quotation?

Contact the international team at [email protected] or by WhatsApp on +86 13626891324, or use the enquiry form on www.uniseel.com. Provide the neck finish, the product to be packed and your target volume, and a matched closure proposal with pricing at the applicable tier will follow.