What are the considerations for structural design of cosmetic plastic deodorant bottle
The basis of structural design: the matching of bottle body structure and usage method
Cosmetic plastic deodorant bottles can usually be divided into several structural forms: ball-on, stick, cream, and spray. Each form has its own unique considerations in structural design:
Ball-style design: The bottle mouth must be equipped with a rotatable ball head structure to ensure that the contents are evenly released when rolling. This requires extremely high coordination between the ball and the bottle mouth, which not only prevents leakage but also ensures smooth rolling. Shaoxing Roman Plastic Co., Ltd. has extensive experience in tolerance control of injection molded parts and is able to ensure accurate assembly of ball components through precision mold control and secondary machining.
Push rod design: commonly used in solid antiperspirant paste products. The bottom of the bottle is equipped with a rotary pushing structure, and the paste is pushed to the bottle mouth through a spiral mechanism. In this structure, we pay special attention to the balance between rotational smoothness and propulsion force. Through multiple experiments, we verify the tooth pitch design and bottle base thickness to ensure the stability and comfort of the user during operation.
Spray type structure: It involves the cooperation of the pneumatic pump head or aerosol valve assembly, and the bottle opening needs to be precisely matched with the atomization nozzle to ensure that the contents are atomized particles uniform. Shaoxing Roman Plastic Co., Ltd. cooperates with professional pump head suppliers to provide bottle design solutions suitable for spray devices of various specifications.
Coordinated design of material properties and structural strength
When designing the antiperspirant bottle structure, the selected plastic material has an important influence on the strength, flexibility and sealing of the bottle. Shaoxing Roman Plastic Co., Ltd. selects the most suitable material combination for structural design based on the customer's formulation characteristics:
PP (polypropylene): It has good chemical resistance, is suitable for most antiperspirant formulations, and has good processing properties, suitable for injection molding.
HDPE (High-density polyethylene): Good flexibility and strong impact resistance. It is suitable for ball bottles, especially suitable for outdoor or sports product packaging.
Highly transparent materials such as PETG and SAN: transparent packaging used in high-end antiperspirant products, which can show the material feeling of content and enhance visual appeal.
We tested and proofed different materials through our own 50 injection molding equipment, evaluated their performance in pushing, rolling, dropping and airtightness testing, ensuring that each structural design performed well in real use scenarios.
Design of sealing and leak-proof performance
Antiperspirant products often contain alcohol, flavors, and active salt ingredients, and have very high requirements for sealing performance. The bottle body structure must consider sealing logic at the design stage:
Locking structure of ball holder: We have designed a variety of ball clamping grooves or snapping structures to prevent the ball from falling off when it falls or is under pressure.
The thread matching accuracy of the cap and bottle mouth: Through mold tolerance design and automated inspection, we ensure that each cover is tightly connected to the bottle body without "deficient twisting" or air leakage.
Double-layer bottle cap design: For high-end products, we provide double-layer cap design, the inner cap ensures sealing, and the outer cap enhances aesthetics and dustproof performance.
Shaoxing Roman Plastic Co., Ltd. is equipped with professional equipment in product sealing performance inspection to conduct constant temperature, airtight, water bath and drop tests to ensure the stability of the packaging products during transportation and use.
What factors affect the sealing performance of cosmetic plastic deodorant bottle
The matching accuracy of the bottle body and bottle cap structure
The sealing is first derived from the structural coordination between the bottle body and the bottle cap. Spiral screw cap, snap-on closure, double-layer cover design, etc. are common sealing methods. In order to achieve high bonding, structural design must ensure:
Accurate thread size tolerance: too loose will lead to fluid leakage, and too tight will be detrimental to consumers to open. Shaoxing Roman Plastic Co., Ltd. adopts high-precision injection molding technology and mold processing technology to control thread tolerances within ±0.05mm, effectively ensuring smooth and tight rotation between the bottle cap and the bottle body.
Anti-leak gasket or inner seal design: High-end cosmetic plastic deodorant bottles are often equipped with PE gasket or inner cap to serve as the second sealing barrier to improve sealing performance. We customize matching sealing components for customers according to the characteristics of different product formulations.
Direct Effect of Injection Molding Quality on Sealing
Cosmetic plastic deodorant bottles usually use plastic materials such as PP, PE, PETG, etc., and key components such as bottle bodies and bottle caps are completed through injection molding. If there are defects such as shrinkage, warping, and eccentricity during the forming process, it is very easy to cause seal failure. To this end, Shaoxing Roman Plastic Co., Ltd. adopts the following quality control measures in the molding process:
It has more than 50 advanced injection molding equipment, including high-precision electric injection molding machines;
Strictly control the mold temperature and injection molding pressure to ensure the consistency of product size;
Each batch of products was subjected to three-coordinate measurement and airtight sampling, and potential sealing risks were found.
In addition, the company can adopt a multi-cavity mold design to achieve consistent batch molding according to customer needs, reduce batch errors and ensure uniform sealing performance of the entire batch of products.
Differences in the structural type of cosmetic plastic deodorant bottles for sealing requirements
Different types of cosmetic plastic deodorant bottles have different requirements for sealing, and structural differences directly affect the design strategy:
Roll-on: The "moving seal" between the ball and the bottle mouth is the key, and the ball needs to have a good fit and rolling smoothness. Shaoxing Roman Plastic Co., Ltd. specializes in developing a variety of ball diameters and seat groove structures, and uses actual filling process to optimize sealing.
Stick type bottle: The push-up structure involves three parts: a screw shaft, a base, and a paste container. The stability during the push-up process must be ensured, and statically sealed through a tight rotating cover.
Spray bottle type: It usually needs to be matched with a pump head or aerosol valve, which requires extremely high accuracy of the bottle mouth diameter. The company ensures that the nozzle is installed tightly and seamlessly through professional mold design, and improves the airtightness of the product.
Effect of content characteristics on sealing materials and structure
Antiperspirants usually contain highly active ingredients and are even corrosive, so the sealing structure also takes into account the chemical compatibility between the contents and the packaging material:
For alcohol-containing antiperspirant formulas, it is recommended to use HDPE or PP bottles, and use elastic TPR or PE sealing gaskets;
For natural organic antiperspirant formulas, environmentally friendly materials and metal-free contact sealing solutions are preferred;
The company supports customization of multi-layer co-extruded bottle structures to further isolate air and water vapor and improve overall sealing performance.
Shaoxing Roman Plastic Co., Ltd. also provides customers with laboratory testing support, conducting stability tests and high temperature and high humidity tests on packaging and contents to ensure that the seal design can withstand the test of transportation and storage.
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