JP2018130329A - Double container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To retain high producibility including a yield in a production process and, consequently, provide low-cost products.SOLUTION: A double container 1 includes an intermediate heat-insulation layer 5 between an inner container 2 and an outer container 3, and a bent part 32 bent inward in a cylinder radial direction, formed at a tip end of a mouth part of the outer container 3, and the double container is formed by fixing the bent part 32 of the outer container 3 and a mouth part 20 of the inner container 2 by welding. The bent part 32 includes a turnback edge portion 32b extending inward the cylinder axial direction, at the inward in the cylinder radial direction. The mouth part 20 of the inner container 2 is located inward the cylinder radial direction of the turnback edge portion 32b, and the mouth part 20 is welded to the bent part 32 of the outer container 3.SELECTED DRAWING: Figure 1

Description

The present invention comprises an intermediate heat insulation layer between a substantially bottomed cylindrical inner container and a substantially bottomed cylindrical outer container,
A bent portion that is bent inward in the cylinder radial direction is formed at the tip of the mouth of the outer container,
The present invention relates to a double container in which the bent part and the mouth part of the inner container are fixed by welding.

As a double container, there is a so-called vacuum double container in which an intermediate heat insulating layer is a vacuum heat insulating layer.
Conventionally, the mouth of this type of vacuum double container has a structure in which the mouth tip of the inner container and the mouth tip of the outer container are fixedly connected by welding. However, there is a problem that this fixed structure by welding has a feeling of an edge depending on the drinker and a good drinking comfort cannot be obtained.

  Therefore, a double container that can obtain advantages such as simplicity of the structure of the container, high efficiency of the manufacturing process, low manufacturing cost, prevention of an increase in the number of parts and an increase in the weight of the container without using welding. This structure is proposed in Patent Document 1, for example.

  The portable thermos disclosed in Patent Document 1 is configured as described below with reference to FIGS. 1 and 2 of the specification.

A vacuum heat insulating layer 4 (corresponding to the “intermediate heat insulating layer” of the present invention) is provided between the substantially bottomed cylindrical inner container 2 and the substantially bottomed cylindrical outer container 1,
A folded portion 321 (corresponding to a “folded portion” of the present invention) that is bent inward in the cylinder radial direction is formed at the tip of the mouth portion 32 of the outer container 1,
The folded portion 321 and the mouth portion 23 of the inner container 2 are fixed by welding.

  The welding and fixing structure of the mouth portion 23 of the inner container 2 with respect to the folded portion 321 specifically disclosed in this prior art is welded and fixed to the inner surface of the mouth portion 23 of the inner container 2 at the tip of the folded portion 321 of the outer container 1. (See FIG. 2).

JP 2014-110 A

That is, in this technique, an enlarged diameter portion is formed in the vicinity of the tip of the mouth portion of the inner container, and the distal end of the folded portion of the outer container is bent back to a position where it substantially contacts the root of the enlarged diameter portion. Is fitted inside the enlarged diameter portion (inner side in the cylinder radial direction), and the tip of the folded portion of the outer container is welded to the inner surface of the mouth portion of the inner container.
Therefore, the welding at this time is to weld the portion where the constituent material of the outer container and the constituent material of the inner container meet (welded portion 6 shown in FIG. 2) obliquely from the inner diameter side of the cylinder, During welding, the constituent material of the outer container is positioned on the front side of the welding and the constituent material of the inner container is positioned on the back side of the welding.
As a result, when viewed from the laser irradiation side, the welding location (the location where the inner container comes into contact with the distal end of the outer container) cannot be directly confirmed by the tip corner of the outer container, and the welding position tends to vary.

  Furthermore, for example, in a portable thermos bottle, a material that is relatively thick with respect to the material of the inner container is usually used as the material of the outer container. The reason for using a thick material for the outer container is to take into account deformation and breakage due to impact and the like, and its strength is important. On the other hand, it is desirable that the constituent material of the inner container be made as thin as possible in consideration of the reduction in weight and heat conduction. In general, a vacuum double container that circulates is thinner than the constituent material of the outer container.

  According to the studies by the inventors, when the conventional structure is adopted, if the constituent material located on the back side of the weld is thin, welding defects (extremely thin portions are formed or holes are likely to occur) are likely to occur. found. That is, the product yield in the manufacturing process is lowered, the product cost is likely to increase, and the product reliability may be inferior.

  As described above, the main object of the present invention is to improve the yield in the manufacturing process even when the inner container is thinner than the outer container, although it is comfortable and has a simple structure. It is to obtain a highly reliable product that can maintain high manufacturing efficiency including low cost.

The characteristic configuration of the present invention is as follows:
An intermediate heat insulating layer is provided between the substantially bottomed cylindrical inner container and the substantially bottomed cylindrical outer container,
A bent portion that is bent inward in the cylinder radial direction is formed at the tip of the mouth of the outer container,
A double container in which the bent part and the mouth part of the inner container are fixed by welding,
The bent portion includes a folded edge extending inward in the cylinder axis direction on the inner side in the cylinder radial direction,
The mouth portion of the inner container is positioned on the inner side in the cylinder radial direction of the folded edge portion, and the mouth portion of the inner container is welded to the bent portion of the outer container.

According to this configuration, the folded edge portion and the mouth portion can be welded in an oblique direction from the inside of the cylinder (inner side in the cylinder radial direction) or in the cylinder axis direction.
Even when welding is performed obliquely from the inner side in the cylinder diameter direction, the inner container component is positioned on the welding surface side of the outer container component, and the outer end of the inner container in the cylinder radial direction (weld point) ) Can be reliably confirmed from the laser irradiation side for welding. As a result, welding quality can be secured. On the other hand, when welding is performed in the cylinder axis direction, the welded portion is exposed when viewed from the cylinder axis direction, so that accurate welding can be easily performed.
Furthermore, according to this configuration, even when a material thinner than the component of the outer container is adopted as the component of the inner container, the component having the same or thicker plate thickness is positioned on the intermediate heat insulation layer side and welding is performed. Therefore, it is possible to manufacture in a state where defects are hardly generated. Therefore, the object of the present invention can be achieved.

The characteristic configuration of the present invention is as follows:
The bent portion includes a shoulder extending inward in the cylinder radial direction, and the folded edge extending inward in the cylinder axial direction from the inner diameter side of the shoulder,
The tip of the mouth of the inner container in the cylinder axis direction is positioned on the inner side in the cylinder axis direction from the shoulder of the outer container, and the mouth of the inner container is in the cylinder radial direction at the folded edge of the outer container. It is welded from the inside.

  According to this configuration, the welded portion is formed at the inner diameter portion of the cylinder, so that the mouth of the person who drinks can hit the shoulder. In addition, this configuration is sufficiently simple with respect to the structure as a double container.

The characteristic configuration of the present invention is as follows:
The bent portion includes a shoulder extending inward in the cylinder radial direction, and the folded edge extending inward in the cylinder axial direction from the inner diameter side of the shoulder,
The mouth end of the inner container in the cylinder axial direction is positioned on the inner side in the cylinder radial direction of the shoulder of the outer container, and the mouth of the inner container is positioned on the folded edge of the outer container. It is welded from the outside.

  According to this configuration, in order to form the welded portion, as schematically shown in FIG. 3B described later, the outer container and the inner container can be welded by welding in the cylindrical axis direction. Therefore, welding can be performed with a relatively simple apparatus configuration. On the other hand, the welded portion is formed by connecting to the shoulder portion, but it can be easily handled by applying a process that does not expose the welded portion. In addition, this configuration is sufficiently simple with respect to the structure as a double container.

The characteristic configuration of the present invention is as follows:
At least one of the mouth portion of the inner container or the folded edge portion is provided with a step portion in which the position of the constituent material is shifted in the cylinder radial direction, and the step portion is a positioning portion in the cylinder axis direction with respect to the counterpart member. is there.

  According to this configuration, positioning of the inner container and the outer container in the cylinder axis direction, which is necessary for welding, can be performed using the stepped portion.

In the configuration in which the step portion is provided, the characteristic configuration of the present invention is:
Provided in the mouth portion of the inner container is an outer container positioning step located on the outer side in the cylinder radial direction on the inner side in the cylindrical axis direction and on the inner side in the cylindrical radial direction on the outer side in the cylindrical axis direction,
The inner end in the cylinder axis direction of the folded edge is in contact with the outer container positioning step, and the outer container is positioned with respect to the inner container.

  According to this configuration, regarding the mouth portion of the outer container in which the bent portion is provided, the processing is related to the bending, and the step portion (outer container positioning step portion) required for positioning in the cylinder axis direction of both containers is used. Can carry this on the inner container side. As a result, it is possible to simplify the manufacturing process by causing separate members (outer container and inner container) to perform processing of the functional parts required in the present invention.

The characteristic configuration of the present invention is as follows:
The deterioration prevention layer which prevents deterioration of the welding part by which the opening | mouth part of the said inner container was welded to the bending part of the said outer container exists.

  According to this configuration, by covering the welded portion, it is possible to prevent deterioration (for example, corrosion) due to the liquid or the like that is exposed to the welded portion and stored in the container, and to ensure the mouthfeel of the drinker. .

The characteristic configuration of the present invention is as follows:
The deterioration preventing layer is a coating layer that covers the weld.

  According to this configuration, it is possible to easily prevent the welded portion from being deteriorated by the coating layer.

  Good drinking comfort and simple structure, for example, even when the inner container is thinner than the outer container, the manufacturing efficiency including the yield in the manufacturing process can be maintained high. In addition, a highly reliable product can be obtained at low cost.

The longitudinal section of the double container of one embodiment concerning the present invention The elements on larger scale which show the structure of the mouth vicinity of the double container of this embodiment Schematic diagram of this embodiment and another embodiment near the mouth Schematic diagram of another embodiment near the mouth Schematic diagram of another embodiment near the mouth Schematic diagram of another embodiment near the mouth Schematic diagram of another embodiment near the mouth

  The double container according to the present invention will be described taking the vacuum double container 1 as a portable thermos as an example.

In this specification, the terms “cylinder axis direction Z” and “cylinder radial direction R” are used.
“Cylinder axis direction Z” is the vertical direction in FIG. 1 (same as in FIGS. 2 to 7), and “inner cylinder axis direction” for the mouth O of the double container 1 means the inner side of the cylinder. “Axial outside” means the outside of the cylinder. That is, the former means a positional relationship (lower side shown in FIG. 1) from the outside to the inside in the mouth portion O of the vacuum double container 1, and the latter means a positional relationship (from FIG. 1 to the outside). Means upper side).
On the other hand, the “cylinder radial direction R” is the radial direction of the cylinder shown in FIG. 1 (the left-right direction in FIG. 1), the inner side is the side toward the axis z, that is, the inner diameter side, and the outer side is away from the axis z. Side, that is, the outer diameter side. The same applies to FIGS. 2 to 7.

[This embodiment]
As shown in FIGS. 1 and 2, the vacuum double container 1 is a state in which a substantially bottomed cylindrical metal container 2 is housed in a substantially bottomed cylindrical metal outer container 3. It consists of
The inner container 2 is integrated in the mouth O of the vacuum double container 1 by welding and fixed in a state of being accommodated in the outer container 3. Usually, the plate thickness T3 of the outer container 3 is T1.5 / T2 of about 1.5 to 1.75 with respect to the plate thickness T2 of the constituent material of the inner container 2.

  The feature of the present invention is that, in the welding and fixing of the inner container 2 and the outer container 3, the inner side of the inner container 2 with respect to the folded edge 32 b that forms the mouth 20 of the inner container 2 in the mouth 30 of the outer container 3. In this embodiment shown in FIG. 1 and FIG. 2, an annular welded portion 4 is formed inside the mouth O of the vacuum double container 1.

  A space is provided between the inner container 2 and the outer container 3 and vacuum suction is performed, so that this intermediate layer becomes the vacuum heat insulating layer 5 (an example of the intermediate heat insulating layer).

  As indicated by broken lines in the drawing, a coating layer 6 made of fluorine or the like is formed on the inner surface of the inner container 2. The coating layer 6 is formed so as to cover the entire inner surface of the inner container 2, and covers the welded portion 4 as will be described later, thereby easily solving problems related to deterioration such as corrosion caused by the stored liquid and the like. be able to.

  The inner container 2 has a substantially bottomed cylindrical main body 21, and an opening 20 is provided at the end of the main body 21 on the opening side via a constricted portion 22. The main body 21 of the inner container 2 includes a substantially cylindrical barrel portion 21a and a bottom portion 21b that closes an end portion of the barrel portion 21a. The connection between the body portion 21a and the bottom portion 21b is realized by a known method such as welding. In FIG. 1, 21c has shown the connection part of both 21a and 21b.

The outer container 3 also has a substantially bottomed cylindrical main body 31, and a mouth portion 30 is provided at the end of the main body 31 on the opening side. A spiral groove s into which a cover member (not shown) is screwed is formed on the outer periphery of the mouth portion 30. The main body 31 includes a substantially cylindrical body 31a and a bottom 31b that closes an end of the body 31a. The bottom 31b is provided with a suction hole 31c that is used when evacuating from the space between the inner container 2 and the outer container 3 by vacuum suction. In addition, an inner lid 31e is provided with a bottom-side opening hole P of the body portion 31a that protrudes inward in the cylinder axis direction, and the inner side of the bottom-side opening hole P is closed by the inner lid 31e. A double closing structure is adopted in which the outer diameter side is closed by the bottom 31b.
After vacuum suction using the suction hole 31c, a sufficient degree of vacuum of the heat insulating layer 5 can be secured by a getter (not shown) provided in advance between the inner container 2 and the outer container 3.

As can be seen from FIG. 2, a bent portion 32 bent inward is formed at the tip of the mouth portion 30 of the outer container 3. The bent portion 32 includes a shoulder portion 32a extending inward in the cylinder radial direction, and a folded edge portion 32b extending inward in the cylinder axial direction from the inner diameter end of the shoulder portion 32a.
A structure is adopted in which the mouth portion 20 of the inner container 2 is positioned on the inner side in the cylinder radial direction of the folded edge portion 32 b and the mouth portion 20 of the inner container 2 is welded to the bent portion 32 of the outer container 3.

  Further, the mouth portion 20 of the inner container 2 is provided with a step portion 7 in which the position of the constituent material shifts inward in the tube radial direction toward the outer side in the tube axis direction, and this step portion 7 is a counterpart member (in the case of this embodiment). Is a positioning portion that exhibits a positioning function in the cylinder axis direction Z with respect to the outer container 3). Specifically, the outer container positioning step 7 is provided at the mouth portion 20 of the inner container 2 so as to be located outside the cylinder radial direction inside the cylinder axis direction and outside the cylinder axis direction inside the cylinder diameter direction. The inner end in the cylinder axis direction of the folded edge 32b of the container 3 is brought into contact with the outer container positioning step 7, and the outer container 3 and the inner container 2 are positioned in the cylinder axis direction Z.

In the present embodiment, the distal end of the mouth portion 20 of the inner container 2 in the tube axis direction Z is positioned on the inner side in the tube axis direction from the shoulder portion 32 a of the outer container 3, and the mouth portion 20 of the inner container 2 is connected to the outer container 3. The folded edge portion 32b is welded from the inside in the cylinder radial direction.
Specifically, the welded portion 4 is formed by laser welding to form a welded portion 4. In FIG. 2, reference numeral 41 denotes a laser head of a laser welding machine. In this example, as shown by a thin line, the laser beam L is obliquely irradiated from the inner diameter side of the cylinder, and the annular welded portion 4 is formed.

  The welded portion 4 is covered with the coating layer 6 described above, so that problems such as corrosion can be dealt with.

  The vacuum heat insulating layer 5 is a vacuum or decompressed space formed between the inner container 2 and the outer container 3. The vacuum heat insulating layer 5 may be provided with a vacuum heat insulating material (not shown), for example, by applying a metal foil such as copper or aluminum to the outer surface of the inner container 2 or the inner surface of the outer container 3.

  When the vacuum double container 1 is manufactured, the cylindrical body constituting the outer container 3 (in this embodiment, the body portion 31a of the outer container 3) is subjected to necessary processing, and the bent portion 32 is formed by bending the tip inward. Form. Furthermore, an enlarged / reduced diameter portion for connecting the inner lid 31e and the bottom portion 31b is provided in the opposite bottom side open hole P site.

Processing of the mouth 20 of the inner container 2 is basically the same as that for the outer container 3.
That is, the mouth portion 20 is formed in the body portion 21a of the inner container 2, and the bottom portion 21b is connected and fixed to the opposite side.

Next, the inner container 2 is inserted inside the body portion 31a of the outer container 3, and the bent portion 32 formed in the mouth portion 30 of the outer container 3 and the mouth portion 20 of the inner container 2 are welded obliquely from the inner side in the cylinder radial direction. To do.
In this welding, as shown in FIG. 2, the tip of the inner container 2 in the cylinder axial direction Z is positioned using the step 7 provided in the mouth 20 of the inner container 2, and the mouth of the outer container 3 is positioned. Laser welding can be performed while being backed by the bent portion 32 of the portion 30.

  Thereafter, necessary steps such as welding of the members constituting the body portion 31a, the inner lid 31e and the bottom portion 31b of the outer container 3 and vacuum suction / exhaust to the space between the inner container 2 and the outer container 3 are performed to perform vacuum double The container 1 can be manufactured.

[Another embodiment]
(1) In the above-described embodiment, the mouth portion 30 is integrally formed with the body portion 31a of the outer container 3. However, the mouth portion 30 and the body portion 31a may be separate members. The same applies to the inner container 2.

(2) Hereinafter, another embodiment of the present embodiment will be described using schematic diagrams shown in FIGS. The present embodiment described so far includes four characteristics Ca, Cb, Cc, and Cd.

Features Ca
The tip of the mouth of the inner container 2 in the tube axis direction Z is positioned on the inner side in the tube axis direction from the shoulder 32 a of the outer container 3, and the mouth 20 of the inner container 2 has a tube diameter on the folded edge 32 b of the outer container 3. Welded from the inside,
Features Cb
An outer container positioning step 7 is provided at the mouth 20 of the inner container 2,
The inner end of the folded edge 32b in the cylinder axial direction is brought into contact with the outer container positioning step 7, and the outer container 3 is positioned with respect to the inner container 2,
Features Cc
A coating layer 6 that covers at least the welded portion 4 in which the mouth portion 20 of the inner container 2 is welded to the bent portion 32 of the outer container 3 is formed,
Features Cd
Sealing of the liquid stored in the inner container 2 is performed in the inner container 2 by the squeezed portion 22.

(2) -1 Regarding the features Ca and Cc,
The present embodiment includes the above-described feature Ca. However, as shown in FIG. 3B, the mouth end of the inner container 2 in the cylinder axial direction Z is in the cylinder radial direction of the shoulder 32 a of the outer container 3. It is good also as a structure which is located inside and weld-fixes the opening | mouth part 20 of the inner container 2 to the folding | turning edge part 32b of the outer container 3 from a cylinder axial direction outer side.
When this configuration is employed, a product with good workability and high reliability can be obtained with the welding direction being substantially the cylinder axis direction Z.

The broken lines in FIGS. 3 (a) and 3 (b) indicate the formation site of the coating layer 6 indicated by the feature Cc. As described above, the coating layer 6 is formed in a form that covers the welded portion 4 (deterioration prevention layer). As shown in FIG. When performed obliquely, the coating layer 6 is sufficient to cover the inner surface of the mouth of the inner container 2.
This type of coating layer 6 is not limited to fluorine as described above, and may be a ceramic layer. Or what is necessary is just to be able to prevent deterioration, such as corrosion, regarding the welding part 4, For example, the polishing layer by electrolytic polishing, buffing, etc. may be sufficient. A layer that achieves this purpose is called a deterioration preventing layer in the present invention.

  On the other hand, as shown by a broken line in FIG. 3B, when welding is performed from the outside in the cylinder axis direction to the axial direction, the coating layer 6 is provided to the outside in the cylinder axis direction beyond the shoulder portion 32a of the outer container 3. If it keeps, the welding part 4 can fully be coat | covered.

(2) -2 Another Embodiment of Feature Cb In this embodiment, the configuration in which the outer container positioning step 7 is provided has been described. However, in the welding stage, an appropriate jig is used for the inner container 2 with respect to the outer container 3. It can also be set as the structure which does not provide the step part 7 by using and supporting. Another embodiment corresponding to FIG. 3 (a) is shown in FIG. 4 (a), and another embodiment corresponding to FIG. 3 (b) is shown in FIG. 4 (b). In these examples, the step 20 is not provided, and the mouth 20 of the inner container 2 and the folded edge 32b of the outer container 3 are both held in a cylindrical shape and welded at a predetermined position.

  As shown in FIG. 3A, in the present embodiment, an example in which the stepped portion 7 is formed in a reduced diameter form at the mouth portion 20 of the inner container 2 is shown. However, the stepped portion 7 is the folded edge of the outer container 3. 32b may be provided in an expanded form. FIG. 5 shows this alternative embodiment.

(2) -3 Another Embodiment of Feature Cd In this embodiment, the seal of the liquid stored in the inner container 2 is realized by providing the squeezed portion 22 in the inner container 2, but also shown in this embodiment. As described above, the outer container 3 of the vacuum double container 1 according to the present invention can have a structure including a shoulder portion 32a at the distal end in the cylinder axis direction, and the inner diameter side portion of the shoulder portion 32a is used as a seal. It can also be used.
Another embodiment corresponding to FIG. 3 (a) is shown in FIG. 6 (a), and another embodiment corresponding to FIG. 4 (a) is shown in FIG. 6 (b). In these examples, the sealing member 33 is provided at the inner diameter portion of the bent portion 32a for sealing.

(3) In the embodiment described so far, the example in which the outer periphery of the outer container 3 and the shoulder portion 32a and the shoulder portion 32a and the folded edge portion 32b are bent is shown. The constituent material such as a semicircular shape may be smoothly folded back from the outer surface of the outer container 3 extending outward in the cylinder axis direction to form a folded edge 32b. In this configuration, the end portion and the vicinity of the end portion that are annularly formed in the tube axis direction Z of the bent portion 32 form a shoulder portion 32a that extends substantially in the tube diameter direction R. An example of this is shown in FIG.

1 Vacuum double container (double container)
2 Inner container 20 Inner container mouth 3 Outer container 30 Outer container mouth 4 Welded part 5 Vacuum heat insulating layer (intermediate heat insulating layer)
6 Coating layer (deterioration prevention layer)
7 Outer container positioning step (step)
32 bent portion 32a shoulder 32b folded edge 41 laser head L laser light

Claims (7)

An intermediate heat insulating layer is provided between the substantially bottomed cylindrical inner container and the substantially bottomed cylindrical outer container,
A bent portion that is bent inward in the cylinder radial direction is formed at the tip of the mouth of the outer container,
A double container in which the bent part and the mouth part of the inner container are fixed by welding,
The bent portion includes a folded edge extending inward in the cylinder axis direction on the inner side in the cylinder radial direction,
A double container in which a mouth portion of the inner container is positioned on the inner side in the cylinder radial direction of the folded edge, and the mouth portion of the inner container is welded to a bent portion of the outer container. The bent portion includes a shoulder extending inward in the cylinder radial direction, and the folded edge extending inward in the cylinder axial direction from the inner diameter side of the shoulder,
The tip of the mouth of the inner container in the cylinder axis direction is positioned on the inner side in the cylinder axis direction from the shoulder of the outer container, and the mouth of the inner container is in the cylinder radial direction at the folded edge of the outer container. The double container according to claim 1, which is welded from the inside. The bent portion includes a shoulder extending inward in the cylinder radial direction, and the folded edge extending inward in the cylinder axial direction from the inner diameter side of the shoulder,
The mouth end of the inner container in the cylinder axial direction is positioned on the inner side in the cylinder radial direction of the shoulder of the outer container, and the mouth of the inner container is positioned on the folded edge of the outer container. The double container according to claim 1, which is welded from the outside.   The at least one of the mouth portion of the inner container or the folded edge portion is provided with a step portion in which the position of the constituent material is shifted in the cylinder radial direction, and the step portion is a positioning portion in the cylinder axis direction with respect to the counterpart member. The double container as described in any one of 1-3. Provided in the mouth portion of the inner container is an outer container positioning step located on the outer side in the cylinder radial direction on the inner side in the cylindrical axis direction and on the inner side in the cylindrical radial direction on the outer side in the cylindrical axis direction,
5. The double container according to claim 4, wherein the inner end in the cylinder axial direction of the folded edge is in contact with the outer container positioning step, and the outer container is positioned with respect to the inner container.   The double container as described in any one of Claims 1-5 in which the deterioration prevention layer which prevents deterioration of the welding part by which the opening | mouth part of the said inner container was welded to the bending part of the said outer container is formed. The double container according to claim 6, wherein the deterioration preventing layer is a coating layer that covers the welded portion.

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