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CN-122008472-A - Injection molding method of massage roller

CN122008472ACN 122008472 ACN122008472 ACN 122008472ACN-122008472-A

Abstract

The invention provides an injection molding method of a massage roller, which comprises the following steps of providing a hollow shaft tube, placing the hollow shaft tube in a mold of an injection molding device, forming a molding space between the hollow shaft tube and the mold, and injecting a molding material towards the molding space along an axis direction perpendicular to the hollow shaft tube, so that the outer periphery of the hollow shaft tube forms a coating layer to manufacture the massage roller. The method can reduce the generation of surface bonding lines and burrs of the finished product.

Inventors

  • CHEN SHICHANG

Assignees

  • 允扬工业有限公司

Dates

Publication Date
20260512
Application Date
20241112

Claims (6)

  1. 1. An injection molding method of a massage roller is characterized by comprising the following steps: providing a hollow shaft tube; Placing the hollow shaft tube in a mold of an injection molding device, the hollow shaft tube and the mold having a molding space therebetween, and Injecting a molding material along an axis direction perpendicular to the hollow shaft tube toward the molding space to mold a coating layer on the outer periphery of the hollow shaft tube, thereby manufacturing the massage roller.
  2. 2. The method of injection molding a massage roller as set forth in claim 1, wherein the injection molding device comprises a first mold base, a second mold base, a stripper plate and a fixed plate, wherein the mold is disposed between the first mold base and the second mold base, the fixed plate is far away from the second mold base, the stripper plate is disposed between the second mold base and the fixed plate, the fixed plate comprises a gate, the second mold base comprises a sprue communicated with the gate, the mold comprises two guide runners parallel to the axis direction, the two guide runners respectively comprise a feed inlet and a discharge outlet, the two feed inlets are communicated with the sprue, the two discharge outlets are respectively disposed at two sides of the hollow shaft tube, and the two discharge outlets are perpendicular to the axis direction and communicated with the molding space.
  3. 3. The method of claim 2, wherein the gate is connected to the sprue via a runner, the sprue has a main runner and two sub runners, the main runner is vertically connected to the runner, and the two sub runners are respectively connected to two ends of the main runner and two inlets.
  4. 4. The method of claim 3, wherein after the massage roller is formed, the injection runner and the two guide runners form a cold material, the cold material comprises a first cold material portion and a second cold material portion, the first cold material portion is positioned in the injection runner, the second cold material portion is positioned in the guide runner, and the stripper plate is separated from the second die holder by cutting off the first cold material portion.
  5. 5. The method of claim 4, wherein the first mold base is separated from the second mold base, and the mold is opened to separate the second cold material portion from the massage roller for removing the massage roller.
  6. 6. The method of injection molding a massage roller according to claim 5, wherein the hardness of the hollow shaft tube is greater than the hardness of the coating layer.

Description

Injection molding method of massage roller Technical Field The present invention relates to an injection molding method, and more particularly to an injection molding method of a massage roller. Background The moderate massage can temporarily stimulate muscles and fascia of a human body, thereby achieving the effects of relaxing and promoting blood circulation. In order to further enhance the massage effect, rollers are often used as auxiliary tools to effectively remove lactic acid accumulation after exercise and relax and relieve body soreness. As shown in fig. 1, a conventional injection molding method of a massage roller is shown, in which a hollow tube 1 is placed in a mold 2 before the massage roller is molded, and then a plastic material is injected into a gate 2a of the mold 2 by an injection gun 3 of an injection machine so as to inject a surface layer portion 4 at the outer periphery of the hollow tube 1, so that the surface layer portion 4 is coated on the hollow tube 1, thereby completing the manufacture of the massage roller. However, the gate 2a of the prior art is located at one axial end of the hollow tube 1, and after the plastic material is introduced into the cavity from the gate 2a, the portion near the gate 2a is cooled and solidified, and the portion far from the gate 2a is solidified later. Such uneven cooling rate tends to cause significant bonding lines and burrs on the surface of the surface layer portion 4, thereby affecting the appearance of the product. More seriously, such defects may cause stress concentration inside the massage roller, reducing the strength of the product. Disclosure of Invention In order to solve the problems, the invention discloses an injection molding method of a massage roller, which adopts injection molding perpendicular to the axis direction of a hollow shaft tube, so that a molding material can completely cover the outer periphery of the hollow shaft tube, thereby effectively reducing common bonding lines and burrs on the surface of the massage roller, and improving the appearance quality and the service life of a product. In order to achieve the above object, the present invention provides an injection molding method of a massage roller, comprising the steps of providing a hollow shaft tube, placing the hollow shaft tube in a mold of an injection molding device, forming a molding space between the hollow shaft tube and the mold, and injecting a molding material along a direction perpendicular to an axis of the hollow shaft tube toward the molding space, so as to form a coating layer on an outer periphery of the hollow shaft tube, thereby manufacturing the massage roller. In another embodiment of the present invention, the injection molding device comprises a first mold base, a second mold base, a stripper plate and a fixed plate, wherein the mold is arranged between the first mold base and the second mold base, the fixed plate is far away from the second mold base, the stripper plate is arranged between the second mold base and the fixed plate, the fixed plate is provided with a gate, the second mold base is provided with a material injection runner communicated with the gate, the mold is parallel to the axis direction and is provided with two diversion runners, the two diversion runners are respectively provided with a material inlet and a material outlet, the two material inlets are communicated with the material injection runner, the two material outlets are respectively arranged at two sides of the hollow shaft tube, and the two material outlets are perpendicular to the axis direction and are communicated with the molding space. In another embodiment of the present invention, the gate is connected to the sprue through a runner, the sprue has a main runner and two runners, the main runner is vertically connected to the runner, and the two runners are respectively connected to two ends of the main runner and two inlets. In another embodiment of the present invention, after the massage roller is formed, the injection runner and the two diversion runners form a cold material, the cold material includes a first cold material portion and a second cold material portion, the first cold material portion is located in the injection runner, the second cold material portion is located in the diversion runner, and when the stripper plate is separated from the second die holder, the first cold material portion is cut off to separate the first cold material portion from the second cold material portion. In another embodiment of the present invention, the first mold base is separated from the second mold base, and the mold is opened to separate the second cold material portion from the massage roller, so as to take out the massage roller. In another embodiment of the present invention, the hardness of the hollow shaft tube is greater than the hardness of the coating layer. Therefore, the method can greatly reduce the uneven cooling phenomenon of the material in