JPH061379Y2 - Heating device for thermoplastic resin sheets - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a heating device for a thermoplastic resin sheet.

(Prior Art) When a thermoplastic resin sheet or a thermoplastic resin sheet containing a fibrous substance or the like is supplied between a pair of molds and shaped into a final product shape, the sheet is It is used by heating to a temperature above the softening point or melting point of the thermoplastic resin by various heating devices before shaping.

As a heating device for the sheet-like material, there are various types such as a batch type, a horizontal continuous type, and a vertical continuous type. Further, the sheet-shaped article conveying section in the heating device is constituted by a wire mesh or wires arranged at regular intervals.

(Problems to be solved by the invention) How quickly a thermoplastic sheet material can be supplied to a mold after being heated by a heating device without foreign matter adhering to the surface of the softened or melted sheet material and contaminating it It is the most important and factor in producing good products. However, there are some problems when using the conventional heating device.

A conventional heating device is usually a device for placing and heating the above-mentioned sheet-shaped material on a wire mesh or wires arranged at regular intervals. That is, it is a method of heating by holding the sheet-like material by line contact, according to the method, when the softened or melted sheet-like material is picked up from the above-mentioned wire mesh or wire after the heating, it is softened or melted. The thermoplastic resin adhered and remains on the wire mesh or the wire.
Therefore, when it is repeatedly used, the resin remaining on the wire mesh or the wire adheres to the surface of the sheet-like melt that is newly supplied and heated, which adversely affects the appearance of the product and makes the product in a good shape continuous. Then there was a problem to manufacture. In particular, in the case where different hues are manufactured by the same apparatus, a lot of labor is required for maintenance for removing the adhered matters.

On the other hand, from the aspect of handling, it is difficult to quickly pick up the softened or melted sheet-like material from the wire mesh or the wire, and as a result, the time from the end of heating to the start of shaping becomes longer, and the heat melted during that time becomes longer. There has been a problem that the plastic resin is cooled and the fluidity of the resin during molding is poor.

An object of the present invention is to provide a heating device for solving the above-mentioned problems of the conventional heating device and obtaining a good product.

(Means for Solving the Problems) That is, the present invention is provided with a conveying unit and a heater, the conveying unit has a convex protrusion, and conveys a sheet-like object by point contact with the protrusion-shaped object. Is a heating device.

The sheet material used in the present invention is a thermoplastic resin sheet material, and examples of the sheet material include polyester resins such as polyethylene terephthalate and polybutylene terephthalate, polyamide resins such as nylon, polyethylene,
A thermoplastic resin such as polyolefin resin such as polypropylene is molded into a sheet. The thermoplastic resin sheet material may be reinforced with fibrous substances such as organic fibers, glass fibers, and metal fibers. Further, the thermoplastic resin sheet may contain flake filler such as mica, glass flakes, talc and the like, and optional additives.

INDUSTRIAL APPLICABILITY The apparatus of the present invention is effectively used for heating and softening or melting a stamping molding material made of a thermoplastic resin reinforced with a fibrous substance.

(Embodiment) An embodiment of the heating device of the present invention will be described with reference to the drawings.

FIG. 1 is a cross-sectional view of a wire conveyor-type horizontal continuous heating device in which a sheet-like material is placed on wires having a protrusion shape and arranged at regular intervals to continuously heat the sheet-like material. That is, the thermoplastic resin sheet material 4 is placed on the heating furnace 2 provided with the heater 3 and the projection-shaped material of the wire 5 having the projection shape, and the roll 1 is rotated to heat the sheet-shaped material. It is a device for carrying.

FIG. 2 is a plan view of the wire conveyor section.

The shape of the protrusion in the present invention is not limited to the shape shown in FIG. 1, and may be any shape that achieves the object of the present invention. The protrusions need not be aligned as shown in FIG. 2, and the arrangement thereof is not limited as long as the object of the present invention is achieved. Third
In the figure, a projection is formed in the vertical direction at the intersection of a normal wire mesh, which can be used by being arranged on a belt conveyor section of a heating device which has been conventionally used.

Further, there is no problem even if the upper end of the protrusion-shaped article is coated with Teflon or the like which has a good releasability from the resin and used.

(Operation and Effect of the Invention) In the present invention, the heating device for the thermoplastic resin sheet has a convex projecting shape on the loading surface so that the sheet is held by point contact during heating. As a result, conventional wire mesh, which was a problem when heated in a state of being held in line contact with a wire, etc., decreased adhesion of molten resin to the wire mesh, wire, etc. Not only can it be manufactured, but it is also preferable from the viewpoint of maintenance.

Furthermore, the handling efficiency is improved, which leads to an increase in work efficiency.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an embodiment of the device of the present invention, FIG. 2 is a plan view of the wire-shaped carrying section in FIG. 1, and FIG. 3 is a case where a wire mesh is used instead of the wire. It is a perspective view of the conveyance part. DESCRIPTION OF SYMBOLS 1 ... Roll 2 ... Heating furnace 3 ... Heater 4 ... Thermoplastic resin sheet-like material 5 ... Wire having a projection shape

Claims (1)

[Scope of utility model registration request] 1. A heating device comprising a transporting section and a heater, wherein the transporting section has a convex projection, and a sheet-like material is transported by point contact with the projection-shaped material.