JPH02208231A - Production of thermal insulating container - Google Patents

Abstract

PURPOSE:To obtain the title container free from thermal strain by, when a vitreous thermal insulating container of double structure such as the middle bottle of a thermos pot is to be manufactured, shielding with a heat radiation- protective member the vicinity of the base of a tip tube for vacuum suction followed by heat fusion to effect tube sealing. CONSTITUTION:A double-bottle structure 1 is first formed. This structure 1 is such that an inner bottle 2 is surrounded by an outer bottle 3 and the space 4 between both the inner and outer bottles is externally communicated through a tip tube 5 provided at the bottom of the outer bottle 3. Second, a silver nitrate solution is introduced via the tip tube 5 into the space 4 to form a silver film on the wall surface. Third, the outer wall surface near the base of the tip tube 5 is coated with a heat radiation-protective member 6 (e.g. Al powder- incorporated silicone-modified coating). Fourth, the air in the space 4 is evacuated through the tip tube 5 to bring the space 4 to a vacuum state, and the tip tube 5 is heated and fused using a burner to cut said tube 5, thus obtaining the objective thermal insulating container with short residual tip tube.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing a glass heat-insulating container such as a thermos bottle.

[Conventional technology]

Glass heat-insulating containers such as the inner bottle of a thermos bottle usually have a space between the inner bottle and an outer bottle surrounding the inner bottle that communicates with the outside via a chip tube provided on the surface of the outer bottle. A double bottle structure is first formed, and a silver nitrate solution is injected into the space from the tip tube to form a silver coating on the inner wall surface of the single bottle structure, and then the air in the space is evacuated from the tip tube using a vacuum pump. This can be obtained by creating a vacuum, heating and melting a desired portion of the chip tube with a burner, cutting the chip tube, and sealing the double bottle structure.

By the way, glass products are easily damaged when subjected to thermal distortion. This tendency is particularly strong in heat-retaining containers because they have a double-layer structure with a vacuum inside. Therefore, even when melting and cutting the tip tube, it is necessary to take measures to prevent the burner flame from hitting the vicinity of the tip tube base of the outer bottle.

Therefore, in the conventional automatic thermal insulation container manufacturing apparatus, an air curtain is provided between the burner flame and the tip tube base of the outer bottle to prevent the heat of the burner flame from reaching the surface of the outer bottle.

[Problem to be solved by the invention]

However, as mentioned above, with only air curtains,
The effect cannot be fully exerted, and the tip tube must be cut by heating and melting it with a burner at a position away from the base of the tip tube.

Therefore, the current situation is that a considerable length of the tip tube remains protrudes from the surface of the outer bottle.

This remaining portion of the tip tube is completely unnecessary as a heat insulating container. For example, if the heat insulating container is the middle bottle of a thermos bottle, a decorative cover is placed on the outside of the inner bottle, but if the remaining part of the tip tube is long, the decorative cover will be correspondingly large and transportation costs will be high, and the manufacturing of the decorative cover itself will be necessary. There is also the problem of high costs.

In view of such circumstances, an object of the present invention is to provide a method for manufacturing a heat-insulating container that can shorten the remaining portion of the tip tube.

[Means to solve the problem]

In order to achieve such an object, the present invention provides a space between an inner bottle and an outer bottle surrounding the inner bottle, which communicates with the outside via a chip tube provided on the surface of the outer bottle. A step of sucking air in the space from the chip tube to make the space a vacuum, and heating and melting a desired portion of the chip tube to seal the chip tube. The gist of the present invention is a method of manufacturing a heat-retaining container comprising: covering at least the outer wall of the outer bottle near the base of the chip tube with a heat ray protection member before the heating and melting.

[For production]

With the above configuration, the heat ray protection member can shield the heat of the heating and melting means of the chip tube, thereby preventing heat that would cause distortion from reaching the outside of the outer bottle.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The method for manufacturing a heat-retaining container according to the present invention includes, for example, the following steps.

■ As shown in Figure 1(a), by the usual method,
A double bottle structure 1 is formed. In addition, the double bottle structure 1 is
An inner bottle 2 is surrounded by an outer bottle 3, and a space 4 between the inner bottle 2 and the outer bottle 3 communicates with the outside via a tip pipe 5 provided at the bottom of the outer bottle 3.

(2) A silver nitrate solution is injected into the space 4 from the tip tube 5 to form a silver coating on the wall surfaces of the inner bottle 2 and outer bottle 3 on the space 4 side.

(2) As shown in FIG. 1(b), a silicone conversion paint mixed with aluminum powder is applied as a heat ray protection member 6 to the outer wall surface of the outer bottle 3 in the vicinity of the base of the chip tube 5, for example, but not limited thereto.

■ Aspirate the air in the space 4 from the chip tube 5 in the usual manner, and as shown in FIG. Seal the tube.

Note that the heat ray protection member 6 is applied as described above,
Since heat is not transmitted to the outer wall surface of the outer bottle 3 and does not cause distortion, the part to be heated and melted can be placed as close to the outer bottle as possible. That is, as shown in FIG. 1fd+, a heat-insulating container can be obtained in which the tip tube remaining portion 8 is shorter than the conventional one.

The method for manufacturing a heat-retaining container according to the present invention is not limited to the above embodiments. For example, in the above embodiment, a heat ray reflective paint was applied as a heat ray protection member near the base of the tip tube of the outer bottle, but an umbrella-shaped heat ray with an insertion hole formed in the center through which the tip tube is inserted. It may be covered with a protective member. In the above embodiment, the heat insulating container has one eye, but it may have both eyes. In the above embodiment, the tip tube was provided at the bottom of the outer bottle, but it may also be placed on the side. In the above embodiment, the heat ray protection member was provided near the tip tube base of the outer bottle after the double bottle structure was formed, but it was arranged to be provided before the inner bottle was surrounded by the outer bottle. I don't mind.

〔Effect of the invention〕

As described above, the method for manufacturing a heat insulating container according to the present invention provides a space between an inner bottle and an outer bottle surrounding the inner bottle that communicates with the outside via a chip pipe provided on the surface of the outer bottle. In the double bottle structure having a double bottle structure, air in the space is sucked from the chip tube to make the space a vacuum, and a beam portion of the chip tube is heated and melted to seal the chip tube. A method for manufacturing a heat-retaining container comprising the step of: before the heating and melting, at least the outer wall of the outer bottle near the base of the chip tube is covered with a heat ray protection member; The heat ray protection member can shield the heat and prevent the heat that would cause distortion from reaching the outside of the outer bottle.

That is, the vicinity of the base of the 1000-knob tube can be heated and melted, and a heat-insulating container can be obtained in which the remaining portion of the tip tube is short and there is no thermal distortion due to heating and melting of the tip tube.

Therefore, the transportation cost and the manufacturing cost of the decorative cover can be reduced.

[Brief explanation of the drawing]

FIGS. 1(a) to 1(d) are explanatory drawings for explaining step by step one embodiment of the method for manufacturing a heat-retaining container according to the present invention. Cross-sectional view, the same figure (BL is a bottom view showing the state in which silicon conversion paint mixed with aluminum powder is applied as a heat ray protection member to the outer wall surface of the outer bottle near the base of the chip tube of the double bottle structure,
The same figure (C1 is a side cross-sectional view showing the state in which the chip tube is cut by heating and melting, and +di in the same figure is a side cross-sectional view showing an example of a heat-insulating container obtained by this method. 1... Double Bottle structure 2...Inner bottle 3...Outer bottle
4... Space 5... Chip tube 6... Heat ray protection member 1 (a) (b)

Claims (1)

[Claims] (1) The tip tube of a double bottle structure having a space communicating with the outside via a tip tube provided on the surface of the outer bottle between an inner bottle and an outer bottle surrounding the inner bottle. A method for manufacturing a heat-retaining container, comprising the steps of vacuuming the space by sucking air from the space, and heating and melting a desired portion of the chip tube to seal the chip tube,
A method for manufacturing a heat-retaining container, characterized in that, before the heating and melting, at least the outer wall of the outer bottle near the base of the chip tube is covered with a heat ray protection member.