Food-grade silicone bracelets are made with hollowed-out patterns

Determine the pattern style and theme

Style selection: Determine the style of the hollowed-out patterns based on the target audience and usage scenarios. If targeting the young and fashionable group, a simple and modern style can be chosen, such as abstract patterns composed of geometric lines, like the combination of triangles and rhombuses, which are full of rhythm and fashion sense. If it is a retro style, you can refer to traditional patterns such as cloud patterns and meander patterns to showcase a classical charm.

Theme setting: Design patterns around a specific theme. For instance, if nature is the theme, patterns such as leaves, flowers, and butterflies can be designed. If the theme is the ocean, elements such as waves, shells and starfish can be adopted to make the bracelet more story-telling and attractive.

Draw design sketches

Hand-drawn sketches: Use a pencil to quickly outline the initial pattern on the paper. It doesn’t need to be overly detailed; the key lies in capturing creativity and the overall layout. You can try it from different angles and proportions, such as matching the contours of round and oval bracelets with patterns of different shapes.

Digital sketches: Use drawing software such as Adobe Illustrator, etc., to convert hand-drawn sketches into digital versions. In the software, it is more convenient to adjust the size, position and shape of the patterns. Color filling and effect preview can also be carried out to ensure that the patterns are in harmony with the overall style of the bracelet.

Mold making stage

3D modeling

Model creation: Based on the design sketches, use professional 3D modeling software such as Rhino and Maya to create 3D models of the bracelet and the hollowed-out patterns. During the modeling process, it is necessary to precisely control the depth and details of the patterns to ensure that they can be clearly presented after forming. For instance, the depth of the pattern is generally controlled between 0.5 and 2 millimeters. If it is too shallow, a distinct hollowed-out effect may not be achieved; if it is too deep, it may affect the structural strength of the bracelet.

Model optimization: Optimize the 3D model, check for sharp corners or unreasonable areas, and avoid problems during mold making and molding. At the same time, the parting surface and demolding Angle of the mold should be taken into consideration to ensure that the product can be smoothly removed from the mold.

Mold processing

CNC machining: 3D model data is imported into the CNC machining center, and the tool is controlled by the computer to perform cutting processing on the mold material to produce precise molds. CNC machining can ensure the precision and surface quality of molds, and perfectly present the details of the hollowed-out patterns.

Electrical discharge machining: For some complex patterns or fine structures, electrical discharge machining is an effective supplementary method. It utilizes the heat generated by electrical spark discharge to erode mold materials, enabling the processing of shapes and precision that are difficult to achieve with traditional processing methods.

Silicone rubber molding stage

Raw material preparation

Material selection: Food-grade silicone raw materials that meet food safety standards are selected to ensure that the bracelet does not produce harmful substances when in contact with the human body. Select the appropriate hardness and color of silicone according to the design requirements. The hardness is generally between 30 and 70 Shore A. Softer silicone bracelets are more comfortable to wear, while harder ones have A more three-dimensional effect.

Raw material blending: Mix and stir the two components A and B of the silicone gel in a certain proportion evenly. During the stirring process, be careful to avoid the formation of bubbles. A vacuum machine can be used to vacuum the mixed silica gel to further remove bubbles and ensure the quality of the product.

Injection molding

Injection molding parameter Settings: Inject the prepared silicone rubber into the mold, and control parameters such as injection pressure, speed and temperature through the injection molding machine. The injection pressure should be moderate. If it is too high, it may cause damage to the mold or flash on the product. If it is too low, the silicone cannot be fully filled into the mold. The injection molding speed should be adjusted according to the complexity of the pattern to ensure that the silicone can flow evenly into all parts. The injection molding temperature should be controlled within the curing temperature range of the silicone, which is generally 120-180 ℃.

Curing treatment: After the silicone is injected into the mold, it needs to go through a certain curing time before it can be formed. The curing time is affected by factors such as the type of silicone and the mold temperature, generally ranging from a few minutes to several tens of minutes. During the curing process, it is necessary to keep the temperature of the mold stable to avoid temperature fluctuations from affecting the product quality.

Post-processing stage

Demolding and trimming

Demolding operation: After the silicone has completely cured, carefully remove the bracelet from the mold. When demolding, operate gently to prevent damage to the detailed parts of the hollowed-out patterns. Some auxiliary tools, such as release needles, can be used, but be careful not to scratch the surface of the product.

Trim the edges and corners: Trim the bracelet after demolding to remove any excess edges and burrs. When trimming, use sharp tools to ensure the cut is smooth and does not affect the appearance of the product.

Surface treatment

Polishing and grinding: To enhance the surface smoothness and luster of the bracelet, polishing and grinding treatments can be carried out. Use sandpapers of different grit sizes to polish the surface gradually from coarse to fine, and then apply polishing paste to polish it, so that the surface of the bracelet presents a smooth and bright texture.

Coloring and decoration: According to the design requirements, color or decorate the bracelet. Food-grade pigments can be used for hand painting, or batch coloring can be carried out through processes such as screen printing and pad printing. You can also inlay some small decorative items, such as rhinestones and pearls, in the hollowed-out patterns to enhance the beauty and fashion sense of the product.