Case Study: Glass Water Bottle Supplier for a Swedish Small Company

Client Background

A Swedish luxury drinking water firm had decided to increase the production to be used in the European market. Their requirement was a large quantity of 330ml bottles of clear glass with vintage round body shape and metal top to preserve the freshness of the product. The reason why they decided to go with Minghang was due to our already established work history in producing bulk glass bottles- focusing on product consistency, food safety and prompt delivery timetable to meet deadlines of the retail launches.

Our Challenge

This Swedish company chose to approach Minghang because it had a bad experience with procurement before. The early bulk order was plagued with defective samples: some of the bottles possessed uneven wall thickness (which resulted in the breaking of the bottles during filling), the metal caps did not form a very good seal (which resulted in loss of carbonation in the soda), and the colour of the logo printing changed between batches, between light and dark. Such problems undermined the brand reputation, with erratic quality of bulk glass bottles frustrating the retailers and consumers.

Root Cause Analysis

Minghang Packaging team identified the issues as: misaligned molds on the production line, resulting in uneven glass thickness (causing a 0.5-1 mm variance); mismatched thread sizes causing loose caps (neck: 28 mm, cap: 27.5 mm); and a lack of calibration in the ink mixer, leading to inconsistent logo color (resulting in an incorrect pigment ratio across the glass bottle batch production).

Our Solution

To mitigate potential issues associated with bulk orders of glass bottles, we have calibrated our molds to ensure a uniform wall thickness of 2 millimeters (verified through tests on 200 random samples).We adjusted the cap thread size to 28 mm and added food-grade silicone gaskets to improve the seal—carbonate retention testing was conducted on 50 filled bottles. For the logo, we calibrated the ink mixer to achieve the precise pigment ratio and added a quality inspection step after each batch of glass bottles was printed.

Custom 400ml Double Wall Glass Water Bottle	Custom 550ml 750ml 1000ml Glass Water Bottles

Results

The final glass bottle batch order met all criteria: uniform thickness (no breakage), a tight cap seal (100% carbonate retention), and uniform logo printing. We delivered 50,000 pcs bottles on time, two weeks ahead of the customer's retail deadline. Sales of botted water exceeded expectations by 35% in the first month, with retailers praising the bottles as “reliable and eye-catching.” The customer noted, “The high quality of Minghang’s mass-produced glass bottles has made our expansion smooth – we plan to double our next order.”