Injection moulding die for light guide plate

Abstract

The invention relates to an injection moulding die for a light guide plate, comprising a movable mould assembly and a fixed mould assembly. The movable mould assembly contains a movable mould plate and a movable mould fixing plate; a piston mold insert is disposed inside the movable mould plate; an injection moulding cavity which communicates with an injection moulding inlet is formed between a transverse plane of the piston mold insert and a transverse plane of the fixed mould plate; the piston mold insert is connected with a first top board through guide posts; the other side of the first top board is fixedly connected with a second top board through fastening bolts; a positioning push rod is also arranged parallel to the guide posts; one end of the positioning push rod is positioned between the first top board and the second top board; the other end of the positioning push rod successively passes through the first top board and the movable mould plate, and the transverse plane of the positioning push rod exceeds the outer transverse plane of the piston mold insert. According to the invention, pressure at all points is uniform during the moulding process of rubber compounds, so as to make the inner stress of the moulded light guide plate low and uniform, solve the problem of nonuniform brightness in light guide plates moulded by present injection moulding dies and accomplish multiple purposes of one die.

Description

Technical field: [0001] The invention relates to the technical field of production molds for light guide plates, in particular to an injection molding mold for light guide plates. Background technique: [0002] In the existing light guide plate injection molding mold, the mold cavity is generally directly formed by the movable template and the fixed template, and the size of the cavity is fixed. It is necessary to design multiple sets of molds according to the thickness of the light guide plate. Each set of mold can only The light guide plate with a fixed thickness is formed, so the cost of the mold costed by the enterprise is relatively high. The existing light guide plate forming mold still has the following technical deficiencies. First, when the light guide plate is injection-molded, especially the ultra-thin light guide plate, the phenomenon of unbalanced injection of the injection molding material often occurs, resulting in internal stress of the light guide plate. Un...

AI Technical Summary

Problems solved by technology

The existing light guide plate forming mold still has the following technical deficiencies. First, when the light guide plate is injection-molded, especially the ultra-thin light guide plate, phenomena such as unbalanced injection of the injection molding material often occur, resulting in internal stress of the light guide plate. Unevenness leads to uneven brightness of the light guide plate, which is easy to form defective products, resulting in high production costs; second, when injection molding a large-sized light guide plate, due to the large flow area of ​​the rubber material, it is easy to cause injection in some areas. Insufficient glue (i.e. underfill, lack of glue, short shot, underfilled mold) and other defects, even if the glue is forced to fill up by increasing the injection pressure of the glue, it is still easy to cause uneven internal stress of the light guide plate and form a defective product

Images