JPH0529863Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a dimple-type heat insulating material having an inclined pattern used in a vacuum multilayer heat insulating material.

[Prior Art] Conventionally, for the insulation of space equipment such as artificial hygiene, or the insulation of cryogenic liquefied gas tanks, etc., a film parallel to the edges 3 and 3' parallel to the longitudinal direction of the film 1 as shown in Fig. 4 has been used. A film 1 made of aluminum-deposited polyester or the like has a dimple pattern in the form of a square lattice, in which dimpled portions 2 are arranged at the intersections of a group of equally spaced parallel lines 7 and a group of equally spaced parallel lines 5 perpendicular to the parallel lines 7. A dimple-type vacuum multilayer insulation material was used, in which film layers were arranged in a multilayered manner, and a vacuum was created between each film layer.

[Problems to be solved by the invention] However, when manufacturing the aluminum vapor-deposited polyester film etc. that constitutes this heat insulating material, when the film 1 is wound up in an aluminum vapor deposition machine, etc., as shown in Figs. 5 to 7, A dimpled portion 2 is further formed on the dimpled portion 2 of the film 1 which has already been wound up.
overlap, and since the portions where the dimpled portion 2 does not exist overlap the portions where the dimpled portion 2 does not exist, the dimpled portion 2 is compressed by the tension of the film 1, and especially during the heating stage of the vapor deposition process, the dimpled portion 2 is compressed by the tension of the film 1. In this case, deformation of the dimpled portion 2 occurred.

Similarly, when the dimpled film 1 is stored in a rolled form or when it is wrapped around a horizontal cylindrical heat shield, the dimpled parts 2 overlap and compressive deformation of the dimpled part 2 occurs. Stable heat insulation performance could not be obtained.

The present invention is intended to solve the above-mentioned problems, and aims to maintain the dimple shape of the dimpled film constituting the dimple-type vacuum multilayer insulation material and stabilize the heat insulation performance.

[Means for Solving the Problems] The present invention provides a first group of equally spaced parallel lines forming an angle with one of the edges parallel to the longitudinal direction of the film on the plane of the film, and edges parallel to the longitudinal direction of the film. A dimpled portion having a diameter d is disposed on the intersection with a second group of parallel lines at an interval D that forms an angle different from the first group of parallel lines with respect to the other side, and The minimum inclination angle θ between the group of parallel lines and the edge in the longitudinal direction of the film is set to be tanθ _nio =d/D.

[Function] Therefore, in the present invention, the dimple arrangement having an inclined pattern prevents the dimple processed portions from overlapping and maintains the shape of the dimples, thereby stabilizing the heat insulation performance of the dimple type vacuum multilayer heat insulating material.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 shows an embodiment of the present invention, in which a group of inclined parallel lines 4 at equal intervals forming an angle with the longitudinal edges 3 and 3' of the film 1 and the longitudinal edges of the film 1 are shown. The dimpled portions 2 are arranged at each intersection with a group of equally spaced parallel lines 5 perpendicular to the sides 3 and 3', forming an inclined pattern of the dimpled portions 2.

Further, as shown in FIG. 2, the minimum inclination angle θ of the group of inclined parallel lines 4 with respect to the longitudinal edges 3 and 3' of the film 1 determines the pitch of the dimpled portion 2 in the longitudinal direction of the film 1. It is expressed by tanθ _nio =d/D by each interval D of the group of equally spaced parallel lines 5 perpendicular to the end sides 3, 3' and the diameter d of the dimpled portion 2.

According to the above-described structure, even when the dimpled film 1 is wound into a roll or wound around a horizontal cylindrical heat shield, the dimpled portion 2 is not easily disposed due to the arrangement of the dimpled portion having the inclined pattern. to prevent overlapping.

FIG. 3 shows another embodiment of the present invention, in which a group of inclined parallel lines 4 and a group of inclined parallel lines 6 are arranged at 3 in the longitudinal direction of the film 1.
3' at different angles, and the dimpled portions 2 are arranged on each intersection point.Even with this arrangement, the dimpled portions 2 are prevented from overlapping as in the previous embodiment. can.

It should be noted that the present invention is not limited to the above-described embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

[Effects of the invention] As described above, according to the dimple-type insulation material having an inclined pattern of the invention, (i) the dimpled portions are arranged in an inclined pattern that is not parallel to the longitudinal edge of the film; As a result, even if it is wound into a roll or horizontally cylindrical, the dimpled portions do not overlap and the shape of the dimpled portions does not change.

(ii) Even when wrapped around a cylindrical heat shield or the like, the dimpled parts do not overlap, so heat conduction can be further reduced and good heat insulation performance can be obtained.

It can produce excellent effects such as:

[Brief explanation of drawings]

Figure 1 is a plan view showing one embodiment of the present invention;
The figures show the minimum inclination angle of Fig. 1, Fig. 3 is a plan view showing another embodiment of the present invention, Fig. 4 is a plan view showing the conventional dimple arrangement, and Fig. 5 shows the conventional dimple arrangement. FIG. 6 is a cross-sectional view taken from FIG. 5, and FIG. 7 is a cross-sectional view taken from FIG. 5. 1 is the film, 2 is the dimpled part, 3,
3' indicates an edge, 4 and 6 indicate a group of inclined parallel lines, and 5 and 7 indicate a group of parallel lines.

Claims (1)

[Scope of utility model registration request] A first group of parallel lines at equal intervals forming an angle with one of the edges parallel to the longitudinal direction of the film on the film plane; and the first group of parallel lines with respect to the other edge parallel to the longitudinal direction of the film. A dimpled portion having a diameter d is disposed on the intersection with a second group of parallel lines at intervals D forming different angles, and the minimum distance between the first group of parallel lines and the end edge in the longitudinal direction of the film is A dimple-type heat insulating material having an inclined pattern, characterized in that the inclination angle θ is tanθ _nio =d/D.