Method for manufacturing earplug and earplug manufactured by method

Abstract

The invention relates to a method for manufacturing an earplug, the earplug comprises a cap body and a sound channel tube arranged in the cap body, and the method comprises the following steps: step 1, preparing a material A and a material B, step 2, carrying out primary injection molding on the material A to form the sound channel tube, and step 3, carrying out secondary coating molding on the cap body on the basis of the primary molding of the sound channel tube. 4, in the mold opening process, the cap body is turned outwards, and the cap body is drawn out of the sound channel tube insertion hole of the middle mold plate through the sound channel tube movable mold; 5, the sound channel pipe is taken down from the sound channel pipe movable mold, the cap body is turned downwards, and a finished product is completed. According to the invention, by utilizing the characteristics of the thermoplastic elastic soft rubber and by means of the extrusion extension characteristics of the material, extraction and demolding are carried out by carrying out upside-down extrusion with the size smaller than the thickness in the mold cavity of the cap body, so that the outer contour of the cap body does not form a parting line in the process of automatically producing the earplug with a novel structure, and the production with high automation degree is realized.

Description

Technical field [0001] The present invention relates to the field of earbuds, particularly a method of manufacturing an earplug and an earplug manufactured by the method. Background technique [0002] The Chinese patent number approved on February 2, 2021 is CN202110145194.4, the authorized bulletin number is CN112936730A, named "a soft and hard combined earphone earplug, the preparation method and mode", the patent document is publicly Soft hard binding earphone earplugs, including a cap body and a channel tube disposed inside the cap body, the cap body is provided with a spoken hole corresponding to the channel tube, the channel tube from the sound hole The edge extends downward, the channel tube is arranged in a cap body, when the earplug is placed in the ear, the body portion will gradually soften the deformation because the human body temperature is subjected to the shape of the ears, which reaches the shape of the ear. The best bonding effect varies from person. It is also ...

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Problems solved by technology

[0003] However, the structure of the above-mentioned earplugs, such as figure 1 , it is easy to turn outward when taking it out, so the applicant has carried out a structural improvement on the earplug, but the neck is formed at the junction of the vocal tract tube and the cap body, and the diameter of the neck is smaller than the diameter of the vocal tract tube, so that the neck forms an inverted Buckle curved surface, when using the original two-color injection mold for injection molding, the undercut curved surface forms an undercut in the mold, and due to the existence of the cap body, it cannot be released normally

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