JP2542649Y2 - Curing sheet for pollution protection - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION Fuel assemblies in nuclear facilities are often handled underwater. Actually a large pool
(Wells, cavities, etc.)
Operations such as replacement, transfer, storage, and inspection of fuel assemblies are being performed. When the water is drained after the work is completed, the structures, floors and walls in the pool are contaminated by radioactive contaminants contained in the water. In order to protect such contaminants from adhering, a method of curing in advance with an adhesive tape sheet has been adopted. The present invention relates to a curing sheet for preventing such contamination.

[0002]

2. Description of the Related Art In a flat place such as a floor surface or a wall surface, the behavior of water in a pool is assumed, and curing is performed with a strong adhesive tape or a weak adhesive sheet is applied and the surrounding area is strengthened. Adhesive sheet
To prevent peeling and to prevent contaminated water from entering the weakly adhesive sheet.

[0003] Adhesive tape sheets used in nuclear facilities, etc., take into account worker exposure in addition to the function of protecting structures, floors and walls from being immersed in water, in particular. Workability during curing is an important factor.

[0004] The conventional strong adhesive tape has the following problems. Poor workability due to strong adhesion. For this reason, when the tape width is reduced, the workability is improved to some extent, but since the curing area for one time is small, it is not suitable for curing a large area. In addition, when the tape width is increased, the curing area increases at one time, but the adhesive strength becomes too strong and the workability becomes extremely poor. Further, when the tape glue surface is touched by hand, it becomes sticky, so that the handleability is poor. However, it is easy to leave peeling when removing.

[0005] Next, as a problem of the weak adhesive sheet, there is the following problem. Since the adhesive strength is weak, it is easily peeled off, and the effect of protecting pollution cannot be expected. That is, there is a possibility that foreign matter may be mixed in the furnace if the film is peeled off, and it is impossible to use it alone.

Further, there are the following problems as a problem when a strong adhesive tape and a weak adhesive sheet are used together. A careful curing plan must be prepared in advance, and several types of tape sheets must be prepared based on the plan. That is, since a weakly adhesive sheet cannot be laminated, it is necessary to prepare sheets having different widths from a pre-curing plan in consideration of a structure projecting from a wall surface or a floor surface. . As described above, the use of a strong adhesive tape / weak adhesive sheet alone has many problems, and a weak adhesive sheet is stuck and both ends are often fixed with a strong adhesive tape. However, for this reason, curing at one place is performed in three steps, and the number of steps is increased.

[0007]

In view of the problems of the prior art, in view of the problems of the prior art, the workability is improved, the peeling residue upon removal is hardly generated, the construction is difficult to be peeled off, and a curing sheet which enables the above points. The purpose is to provide

[0008]

Means for Solving the Problems A curing sheet is provided in a longitudinal direction of a sheet by alternately and in parallel with a strong adhesive material applying portion 2 and a weak adhesive material applying portion 3 having a fixed width and having both side edges. Are both weak adhesive material application parts 3. Also, pull out the roll of this curing sheet,
Large-diameter portion 5 that hits only the weak adhesive material application portion 3 of the sheet
And a stepped roll 4a having a small diameter portion 6 corresponding to the strongly adhesive material application portion 2, and a cylindrical roller contacting the non-application portion side of the sheet.
4b.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. In FIG. 1, curing sheet 1
In the figure, strong adhesive material application portions 2 and weak adhesive material application portions 3 are provided alternately and in parallel in the longitudinal direction of the sheet. However, both side edges are the weak adhesive material application portions 3.

Referring to FIG. 2, a curing sheet 1 according to the present invention.
Consider the adhesive strength of FIG. 2 shows the adhesive strength in the range of length L and width L.
₁ gr / mm, the adhesive force of the weakly adhesive portion is F ₂ gr / mm, the total width of the strongly adhesive portion La = ΣAn, the total width of the strongly adhesive portion Lb = ΣBn,
However, assuming that L = ΣAn + ΣBn, when peeling in the width direction, that is, in the direction χ in the figure, the weak adhesive material application portion 3 at the end is immediately peeled off, but the next strong adhesive material application portion 2 is joined by a force of F ₁ × L. It is difficult to peel off. On the other hand, in the case of peeling in the y direction, F ₁ × La + F ₂ × Lb, so that the bonding force is clearly small and the peeling is easy. That is, the curing sheet 1 has a direction of the peeling force.

FIG. 3 shows a sheet pulling roll 4 for pulling out a curing sheet 1 wound in a roll shape according to the present invention.
The roll 4 has a stepped roll 4a having a large diameter portion 5 corresponding only to the weak adhesive material application portion 3 of the sheet and a small diameter portion 6 corresponding to the strong adhesive material application portion 2; Cylindrical roller in contact with the coating section
4b.

When such a stepped roller is used, the roller
Since the roller and the sheet are easily peeled off, the sheet does not get caught in the roller, and the sheet can be drawn out by an electric motor or the like.

[0013]

[Effect] The curing sheet is not uniformly coated with an adhesive, but is applied in a striped pattern at a constant pitch in the longitudinal direction of the wound sheet to provide a difference in the strength of the adhesive force. It has a great effect.

Improvement in workability Even with a peeling force equivalent to that of a strong adhesive tape, a large curing area can be obtained at one time, so workability is improved.

By working with the weakly adhesive portion, the stickiness of the hand is eliminated and the handling is simplified.

Since both ends of the curing sheet are weakly adhered, they are easily peeled off. Therefore, it is difficult for peeling residue to occur at the time of removal.

The curing sheet has a directional adhesive force as described with reference to FIG. Therefore, by assuming the behavior of water and sticking the stripe direction at right angles to the water flow, it is possible to perform construction that is difficult to peel off. In addition, even if the first-level strongly-adhesive part is peeled off from the end due to an accident, etc., the second-level and subsequent strongly-adhesive parts are strongly joined to prevent the infiltration of contaminated water. it can.

The curing sheet can be overlapped with another sheet by overlapping the strongly adhesive portion. Therefore, it is sufficient to prepare one sheet of fixed width, and it is not necessary to prepare sheets of various widths based on the curing plan. The width of the sheet is restricted by the glue application pitch, but the curing sheet can be cut by determining a value close to the width most suitable for each curing location.

Reduction of man-hours Where three curing steps were required for one place, only one step is required.

The use of a stepped roller in which the peeling roller hits the weakly adhering portion facilitates mechanization.

[Brief description of the drawings]

FIG. 1 is a perspective view of a curing sheet according to the present invention.

FIG. 2 is an explanatory view of the adhesive strength of a curing sheet.

FIG. 3 is a perspective view of a roll for pulling out a curing sheet.

[Explanation of symbols]

 1 Curing sheet 2 Strong adhesive material application part 3 Weak adhesive material application part 4 Roll 5 Large diameter part 6 Small diameter part

Claims (2)

(57) [Scope of request for utility model registration] A strong adhesive material application section (2) and a weak adhesive material application section (3) having a fixed width are provided alternately and in parallel in a longitudinal direction of the sheet, and both side edges are both weak adhesive material application sections. (3) A curing sheet for contamination protection characterized by the above (3). 2. A stepped roll having a large-diameter portion (5) that only hits the weakly-adhesive-coated portion (3) of the sheet and a small-diameter portion (6) that corresponds to the strongly-adhesive-coated portion (2). A curing sheet pull-out roll composed of (4a) and a cylindrical roll (4b) in contact with the non-coating portion side of the sheet.