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Forming method of thin molded products

A thin-formed product and process technology, applied in the direction of flat products, household appliances, other household appliances, etc., can solve the problems of deterioration of optical properties, unavailability, increase in weight, etc., to prevent residual residual stress, and to smooth and alleviate the compression process. Effects of deviations in pressure distribution

Active Publication Date: 2015-11-18
THE JAPAN STEEL WORKS LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the case of a light guide plate, if the plate thickness is not uniform, the optical characteristics will deteriorate and cannot be used.
In order to avoid such a problem when molding a medium-sized or larger light guide plate, conventionally it was necessary to increase the plate thickness and increase the weight

Method used

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  • Forming method of thin molded products
  • Forming method of thin molded products
  • Forming method of thin molded products

Examples

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Embodiment Construction

[0029] The molding method of the thin molded article of this embodiment can be performed by a conventionally known injection molding machine. In this embodiment, a method of molding a medium-sized or larger light guide plate for liquid crystal with the electric injection molding machine 1 will be described, but the electric injection molding machine 1 will be schematically described. like figure 1 As shown, the electric injection molding machine 1 is also composed of an injection device 2 and a mold clamping device 3 as is conventionally known. The injection device 2 is composed of a heating cylinder 5 and a screw 6 provided in the heating cylinder 5 , and an injection nozzle 7 is provided at the front end of the heating cylinder 5 . A band heater 8 is wound around the outer peripheral surface of the heating cylinder 5 , and a hopper for supplying a resin material into the heating cylinder 5 is provided near the rear end. figure 1 The hopper is not shown. The screw 6 can ...

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Abstract

PROBLEM TO BE SOLVED: To provide a forming method of a thin-walled molded product capable of forming a light guide plate for a liquid crystal of a medium or larger size. SOLUTION: A thin-walled molded product is formed by using an injection device (2) composed of a heating cylinder (5) and a screw (6). Firstly, dies (20, 21) are placed in a state of being opened by a predetermined amount, and a screw (6) is driven in the axial direction to inject molten resins in cavities. The dies (20, 21) are clamped to compress the injected molten resins. During compression, the screw (6) is retracted by a predetermined time to lower the resin pressure of the molten resins in the cavities. Thereafter, a driving force in the axial direction is applied to the screw (6) to perform the pressure application of applying the predetermined resin pressure to the molten resins. The drive of the screw (6) during the pressure application may be subject to speed control, and then, switched to pressure control. COPYRIGHT: (C)2012,JPO&INPIT

Description

technical field [0001] The present invention relates to a method of molding a thin molded product in an injection molding machine. Although not limited thereto, the present invention relates to a method of molding a thin molded product suitable for molding a light guide plate used for liquid crystals. Background technique [0002] It is well known that an injection molding machine is composed of a pair of molds, a mold clamping device for clamping these molds, an injection device for melting a resin material and injecting it into the mold, etc. Consists of a screw driven in the direction of rotation, etc. A pair of molds are clamped by the mold clamping device, and the measured molten resin is injected by axially driving a screw in the cylinder to fill the cavity formed in the mold. Molded products can be obtained when the mold is opened after cooling and solidification. [0003] However, in a mold for molding a so-called thin molded product that is thinner than its size, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C45/46B29C45/64B29C45/76B29L7/00
Inventor 儿玉浩一泽田靖彦须佐圭吴
Owner THE JAPAN STEEL WORKS LTD
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