JPS63198225A - Manufacture of resin-coated lamp - Google Patents

Abstract

PURPOSE:To unify the contraction and secure the adherence to a lamp face by heating a thermal contraction tube inserted with a straight tube lamp while suspending it vertically. CONSTITUTION:A fluorescent lamp 2 is inserted into a thermal contraction tube 1, the lower end A of the thermal contraction tube 1 is closed by a fastener 3, a suspending hole 4 provided at the upper end B is suspended from a suspending metal 7 on an endless chain 6 running in a heating furnace 5 at a constant speed, and the thermal contraction tube 1 is transferred through the heating furnace 5. According to this method, the thermal contraction tube 1 is vertically subpended while being applied with no force other than in the axial direction, uniformly heated by the heating furnace 5 constituted of a heat radiation furnace, a hot air circulation furnace or the like, uniformly contracted so as to adhere to the outer face of the lamp 2, both ends A, B are formed into a nearly conical shape, and the removing work of the end face is facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing a resin-coated straight tube fluorescent lamp, and particularly to a method of manufacturing a resin-coated straight tube fluorescent lamp, which is suitable for coating with a heat-shrinkable thin film tube.

[Conventional technology]

Conventionally, lamps using heat-shrinkable thin film tubes coated with resin have been proposed, for example, as described in Japanese Utility Model Application Publication No. 51-69386.

The production quantity is also small, and no concrete proposal has been made regarding a method for producing it in large quantities industrially.

[Problem that the invention seeks to solve]

As mentioned above, there is no proposal for a specific mass production method for heat-shrinkable tube-covered lamps, but for small-scale production,
Insert the lamp into the heat shrink tube.

Methods such as shrinking in a constant-temperature heating tank in a horizontal position were known as batch processing, in which bulk quantities were processed at the same time, but uniform heating could not be achieved, resulting in uneven shrinkage. Uneven shrinkage occurs in the lamp holder.

There were problems such as the shape of the contracted end of the tube was not uniform, making it difficult to cut the excess portion of the tube, and the productivity was low.

An object of the present invention is to provide a method for manufacturing a resin-coated lamp that can obtain a uniform contracted state and have a uniform contracted shape at two ends, and has good productivity.

[Means for solving problems]

For the above purpose, the straight tube lamp was cut to a length longer than the total length.
Insert the straight lamp into the heat-shrinkable thin-film tube, close one end of the heat-shrinkable thin-film tube, hang it vertically with the other end upward, and let it pass through a heating furnace to shrink uniformly. This is achieved by removing the excess tube from both ends.

[Effect]

As in the above-mentioned method, the upper end of the heat-shrinkable tube into which the straight tube lamp is inserted is held in a vertical position and heated in a suspended state, so that the tube can be uniformly shrunk without leaving any traces of the holder etc. on the coated surface. As a result, a uniform shrinkage surface can be obtained. Also, the part of the tube that protrudes from the lamp is not subjected to any external force other than in the direction of the lamp axis, so it contracts uniformly into a circular shape.

This makes it easier to remove the surplus portion in the post-process.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

Insert the fluorescent lamp 2 into the heat shrink tube 1, and attach the lower end A of the heat shrink tube 10 to the stopper 3 (for example.

A hole 4 for hanging is provided at the upper end B, and the lamp 2 is successively connected perpendicularly to a hanging fitting 7 provided on an endless chain 6 that runs at a constant speed inside the heating furnace 5 to prevent the lamp 2 from falling. Hang it and pass it through the furnace.

The heating furnace 5, which is constituted by a heat radiation furnace, a hot air circulation furnace, etc., uniformly heats the heat shrink tube 1 and shrinks it so that it comes into close contact with the outer surface of the lamp 2. Further, by sequentially heating the suspended heat-shrinkable tube 1 from below, it is possible to prevent air bubbles from remaining and uneven shrinkage.

After heating and shrinking, as shown in FIG. 3, it shrinks uniformly and both ends A and B shrink into a substantially conical shape and do not protrude beyond the outer surface of the lamp 2.

Therefore, by cutting off both ends A and B from the vicinity of the base 8 using a knife or the like, a resin-coated lamp whose surface is uniformly covered with resin can be obtained as shown in FIG.

As described above, according to this embodiment, the lamp 2 is placed in a vertical position, and no force is applied to the heat-shrinkable tube 1 other than in the axial direction, so that it can be uniformly shrunk, and the heat-shrinkable tube 1 can be uniformly shrunk. Adhesion can be ensured, and both ends A,
9. Since part B can be contracted into a conical shape so that it does not protrude beyond the outer surface of the lamp 2, the end face can be easily removed in the subsequent process.9. It is also possible to automate. Father, since the heat-shrinkable tube 1 is tightly contracted to the outer end of the cap and reliably shrunk, even if it is cut near the outer end, the heat-shrinkable tube 1 remains in close contact with the surface of the cap 8, and it has an excellent shape. Become.

〔Effect of the invention〕

According to the present invention, it is possible to uniformly shrink the heat-shrinkable tube that covers the lamp, and it is possible to effectively bring the coating into close contact with the outer surface of the lamp, thereby obtaining a resin-coated lamp that has an excellent appearance when lit. be able to.

In addition, since both end surfaces are uniformly contracted into a conical shape, the ends can be easily treated, and the coating can be reliably adhered to the first cap.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a heating process showing an embodiment of the method of the present invention;
Fig. 2 is a three-sided view showing the lamp inserted into the heat shrink tube, Fig. 3 is a longitudinal cross-sectional view and side view showing the lamp after shrinking, and Fig. 4 is an external perspective view of the lamp completed using this method. It is. 1... Heat shrink tube, 2... Fluorescent lamp, 5...
・Heating furnace, 6...Endless chain, 7...Hanging fittings. Agent Patent Attorney Katsuo Ogawa ゛□ Hato/Kuchi No. 20 (C) 84th Ward

Claims (1)

[Claims] 1. As a method for manufacturing a resin-coated lamp using a heat-shrinkable thin-film tube, a straight tube lamp is inserted into the heat-shrinkable thin-film tube, and one end of the heat-shrinkable thin-film tube is closed.
A resin coating characterized by hanging vertically with the other end upward, passing through a heating furnace to uniformly shrink the resin, and then cutting off the part of the resin that protrudes from the lamp near the lamp end. Method of manufacturing lamps.