This double color oil cap is applied for automobile lubricants, which is made by double color rotary injection molding process. The mold is composed by two different molds, one for making first color with customer's logo, the second mold is for making outer color. This kind of double color injection is better then single color or screen printing, meanwhile, the logo is not easy to be faked which is the best solution to rise company image up.

The unscrewing device of this cap mold is hydraulic motor. The ejecting sequence of this cap mold is to let the upper press plate open the mold first, and rely on the I-shaped block to drive the cavity slider to slide away. The mold is opened to a certain stroke, and the caps will be unscrewed by hydraulic unscrewing motor. The left and right thimble plates are performed simultaneously. The spring is pushed out of the barrel by the force of the spring, so that the product is firmly in the core part. After opening the mold, the oil cylinder pushes the rack, drives the central drive shaft, drives 4 product threaded shafts backward to disengage the product, and then relies on the 2 ejector rods on the outside of the machine, and the ejection plate pushes caps off from mold.

This double color cosmetic cap is not only two colors, but also the caps have to be demoulded out from mold by unscrew device instead of conventional forced ejection. The mold structure is more complicate than other double color mold and mold dimension is bigger. Moreover, the steel of unscrew device shall be high-end quality with heat treatment in order to avoid wearing and tearing in short time of movement.

The cap of salt shaker is combined with lid and cover. There are two holes on lid for fixture of cover, which lid mold shall be designed with lifters. The neck of lid is necessary to design sliders before being ejected out from cavities. This design is to protect the thread of lid and avoid damage by force ejecting. Briefly, the lid looks simple and common plastic part, the mold design is more complicate.

Plastic liquor caps are different from the ones we usually use. They are not sealed by threads or barbs like plastic caps of mineral water bottles, but by oak plugs. However, the oak plugs may cause decay or cracking after long-term and long-distance transportation or weather, plastic caps are needed to keep them sealed and protect oak plugs.

The plastic raw material of 5G cap is LLDPE, which has high gloss, high heat resistance and better fluidity than the general materials. In addition, the steel of mold core and cavity is S136, with a hardness of 48-52, which can better for mold life. It could be design with 12 cavities or 16 cavities, each cavity has its own independent cooling system to ensure that the products can be better shaped and cooled.

Principle of unscrewing device system: The head of the motor is equipped with gears, which drive the chain, the chain drive the middle bearing, and the bearing gear drive the two big gears. The big gear is kneaded with the bearing gear of the product, and the inner screw of the product is pulled out by rotation.

Focare Mould is a professional plastic injection mold maker. We fabricate different kinds of injection molds, such as household molds, caps molds, pipe fitting molds, thin-wall packaging molds, multi-color molds, etc. We make various kinds of caps molds, such as oil caps molds, unscrewing caps molds, water bottle caps molds, and flip top caps molds. We have a lot of experiences in cap mold making. If you are searching for a good injection cap molds supplier, please do not hesitate to contact with us. We are happy to share our experience of injection caps molds with you.

For the cap design, people always want to find a new way, but due to the limit of traditional molding way, it cannot have so much outstanding design to attract people’s eye with single color. With the new molding technology development, Bi-injection, tri-injection … it helps designers to have more idea on the design and come with beautiful appearance. I believe more and more customers will like this design idea and to make their own brand outstanding. Focare Mould is mold maker who is specialized in two color mold design and manufacture. We are here to help you make your fantastic idea into reality.