Packaging development – glass bottle design case sharing

Glass design needs to be comprehensively considered: product modeling concept (creativity, goal, purpose), product capacity, type of filler, color, product capacity, etc. Finally, the design intention is integrated with the glass bottle production process, and the detailed technical indicators are determined. Let’s see how a glass bottle was developed.

Customer specific requirements:

       1. Cosmetics – Essence Bottles

       2. Transparent glass

       3. 30ml filling capacity

       4, round, slender image and thick bottom

       5. It will be equipped with a dropper and has an inner plug

       6. As for post-processing, spraying is necessary, but the thick bottom of the bottle needs to be printed, but the brand name needs to be highlighted.

The following suggestions are given:

       1. Because it is a high-end product of essence, it is recommended to use high white glass

       2. Considering that the filling capacity needs to be 30ml, the full mouth should be at least 40ml capacity

       3. We recommend that the ratio of the diameter to the height of the glass bottle is 0.4, because if the bottle is too slender, it will cause the bottle to be easily poured during the production process and filling.

       4. Considering that customers need thick bottom design, we provide a weight-to-volume ratio of 2.

       5. Considering that the customer needs to be equipped with drip irrigation, we recommend that the bottle mouth is designed with screw teeth. And because there is an inner plug to be matched, the inner diameter control of the bottle mouth is very important. We immediately asked for the specific drawings of the inner plug in order to determine the inner diameter control depth.

       6. For post-processing, taking into account the requirements of customers, we recommend gradient spraying from top to bAfter communicating with customers, make specific product drawingsottom, screen printing text, and bronzing Logo.

After communicating with customers, make specific product drawings

When the customer confirms the product drawing and starts the mold design immediately, we need to pay special attention to the following points:

      1. For the initial mold design, the excess capacity should be as small as possible, so as to ensure the thickness of the bottom of the bottle. At the same time, it is also necessary to pay attention to the thin shoulder, so the shoulder part of the preliminary mold needs to be designed to be as flat as possible.

       2. For the shape of the core, it is necessary to make the core as straight as possible because it is necessary to ensure that the internal glass distribution of the straight bottle mouth is matched with the subsequent inner plug, and it is also necessary to ensure that the thin shoulder cannot be caused by the straight body of the too long core.

According to the mold design, a set of molds will be made first, if it is a double drop, it will be two sets of molds, if it is a three drop, it will be a three-piece mold, and so on. This set of molds is used for trial production on the production line. We believe that trial production is very important and necessary, because we need to determine during the trial production process:

      1. Correctness of mold design;

     2. Determine production parameters, such as drip temperature, mold temperature, machine speed, etc.;

      3. Confirm the packaging method;

      4. Final confirmation of quality grade;

      5. Sample production can be followed by post-processing proofing.

Although we paid great attention to the glass distribution from the beginning, during the trial production process, we found that the thinnest shoulder thickness of some bottles was less than 0.8mm, which was beyond the acceptable range of SGD because we thought that the glass thickness less than 0.8mm was not safe enough. After communicating with customers, we decided to add a step to the shoulder part, which will help the glass distribution of the shoulder to a great extent.

See the difference in the image below:

 

Another problem is the fit of the inner plug. After testing with the final sample, the customer still felt that the fit of the inner plug was too tight, so we decided to increase the inner diameter of the bottle mouth by 0.1 mm, and design the shape of the core to be straighter.

Deep processing part:

When we received the customer’s drawings, we found that the distance between the logo that needs bronzing and the product name below is too small to be done by printing the bronzing again and again, and we need to add another silk screen, which will increase the production cost. Therefore, we propose to increase this distance to 2.5 mm, so that we can complete it with one screen printing and one bronzing.

This can not only meet customer needs but also save costs for customers.