JPS6159084A - Marker for material to be laid - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Field of application on M beams] This invention relates to a buried object sign that is buried near underground objects to indicate the presence of the buried objects when excavating the ground. It is.

[Conventional technology]

Gas pipes buried underground, water and sewage, /L? , power line.

When repairing buried objects such as communication lines, or burying other buried objects such as piping nearby, it is necessary to dig up the ground, but this prevents the buried objects from being damaged by power shovels, etc. To do.

Above the buried object, the type, standard, and burial period of the buried object are displayed.

Signs with printed warnings etc. are buried.

As a conventional buried object marker of this type, a woven fabric made of a stretched tape of a high-density polyethylene film and an indicator film made of a low-density polyethylene film are connected together. There is one in which laminate sheets are laminated together with layers interposed in between and folded at intervals in the longitudinal direction and spot welded at one overlapping part.

[Problems to be Solved by the Invention] In the conventional buried object sign as described above, the woven fabric of the stretched tape used as the base fabric has a width of 7 to lOo+m and a width of 1000 mm, which is easily available in order to provide flexibility. ~1500
Denier thin-walled high-density polyethylene stretched tape (
Flat yarn) is used, and the flat yarn is woven at a density of 6 to 14 yarns/inch in both length and width in order to have a strength of 1. Therefore, considering the case where the above-mentioned woven fabric has a width of 7 mm and 10 pieces/inch, for example, (7
XIO) ÷ 25.4 = 28, and the stretched tape has an average of 2
．． This means that it has been folded eight times, and for this reason, the laminate sheet used in conventional buried object markers has a structure as shown in Figure 3.

In FIG. 3, the laminate sheet 1 is a 41ff sheet in which a woven fabric 2 and a display film 3 are pasted together via an adhesive layer 4.
It is constructed. The woven fabric 2 is made by weaving the stretched high-density polyethylene tape 5 folded as described above, and is made of a low-density polyethylene display film 3 having one display area 6 and a low-density polyethylene adhesive layer 4. It is pasted together.

In this way, in the conventional buried object sign, the stretched tape 5 of the woven fabric 2 is in a folded state, so that only a part of the stretched tape 5 is adhered to the adhesive layer 4, and the other parts are Most of it is floating. Therefore, when the laminate sheet 1 is slit to a width of, for example, 150 to 200 mm, folded, and rolled up to form a product, the unbonded portion that floats up from the end surface comes off in the form of fluff and is pulled out.

Since the stretched tape 5 has extremely high strength in the longitudinal direction, the fluffy portions are pulled out one after another without being cut, and become entangled with the slit equipment, etc., eventually causing the machine to stop. In addition, if buried object markers are installed at the site by inserting a finger or a stick into the core and rotating the core, the fluff will get tangled with the fingers or stick, pulling the installed marker abnormally and causing it to move out of position.
There was a problem in that the fluff had to be trimmed in order to change the shape etc.

[Means for solving problems]

This invention is intended to solve the above problems.

If the woven fabric is woven without folding in the width direction,
By adhering it to f, one side of the stretched tape is coated with PA over the entire width, thereby providing a buried object sign that does not generate fuzz.

The present invention relates to a woven fabric of a stretched tape made of high-density polyethylene, which is woven so that at least the stretched tape in the longitudinal direction is not folded in the width direction.

The laminated tote consists of a laminate tote having a low density polyethylene joint, 7rm, bonded to one side of the woven fabric, and the laminate sheet has overlapping sections folded at intervals in the longitudinal direction, and has overlapping sections folded at intervals in the longitudinal direction. This is a buried object marker characterized by having a partially welded part.

The present invention will be explained below with reference to the drawings. The drawings show examples, and FIG. 1 shows Lamiho sheets 1 to 19? Figure 2 is a perspective view of the sign.

The laminate sheet 1 has a structure in which a woven fabric 2 and a display film 3 are bonded together with an adhesive layer 4 interposed therebetween, as in the conventional one. Woven fabric 2 has a density of 0! 140 g/aJ
Above, preferably 0. 51~0.954 g/an
? -Melt flow index (hereinafter referred to as MFI)
0.1-3 g/10IIIin, preferably 0.6
5-0.9. / l A stretched tape 5 made by slitting a high-density polyethylene film 11 of 0 m1n and heating and stretching it to a ratio of 5 to 10 times is woven with a normal loom such as a bamboo thread loom or an innovative loom so that no folding occurs in the width direction. The stretched tape 5, which is used to prevent folding in the width direction of the woven cloth, may be used in both directions, but it may be used only in the longitudinal direction.

The stretched tape 5 has a strength of about 5 g/denier.

The strength is approximately 4000 kg/cnf per unit plate volume, which is approximately 300 kHz/aIr times greater than that of the raw resin.

Therefore, the strength of the woven fabric 2 woven from this is greater than that of the raw resin film, and it has good chemical resistance, so it has great durability underground, and has excellent FAM properties with the adhesive layer 4. . Density of raw resin is 0, 940151c
sa not, 1gl ter;j: strong e decreases 1. , M.F.
When I is 0.1 g/10 min, the extrusion rate decreases at I'A, and M F r is 3! E/ 10mj
If it exceeds n, bubbles become unstable during fabric forming by the inflation method and are likely to break during 12-weaving.

The stretched tape 5 is formed by slitting the film t1 made of the above-mentioned high-density polyethylene into a predetermined width using a single-turn razor blade, etc., and heating and stretching it at a temperature range below the melting point of the raw material resin and above the secondary dislocation point. be done. Stretching is performed using a difference in peripheral speed between nip rolls on the inlet and outlet sides of the heating device, and the stretching ratio is generally 5 to 10 times, preferably 6 to 8 times. If the draw ratio is too low, strength cannot be obtained, and if the draw ratio is too high, the yarn tends to split into fibers, resulting in poor SM properties.

The width of the stretched tape 5 is set so that it will not be folded in the width direction when weaving, and the thickness of the stretched tape 5 is generally set to 2-b, and the thickness of the stretched tape 5 is set so that the necessary strength can be obtained at the above-mentioned width. 25-100μ.

It should be about 1000 to 1500 denier.

The method of weaving the stretched tape 5 is not particularly limited.

The woven fabric has a stretching tape 5 of f? Because it cannot be folded,
O(1' deterioration due to tape bending, etc.) is reduced by I11, and the cross strength is increased.For this reason, the weave density can be lowered, but it may be the same density as the conventional one.

The display film 3 has a density of 0.93g/(:n? or less, preferably 0.921-0.4 parts 22g/al, M
FI O, made of low-density polyethylene film of 5-8 g/10 m1n, preferably 2.7-3.3 g/10 m1n, and the type of buried object, standard, burial period, and warning are written on the back side (adhesive layer 4 side). A display section 6 with printed characters, pictures, etc. is formed.

The density of the raw resin is 0.930g/cit! :If you cross it,
The foldability of the laminate sheet 1 deteriorates, and the MFIo
, if it is less than 5 g/10 m1n, the throughput will decrease.

If the MFI exceeds 8 g/l0m1n, the printed display portion 6 is likely to be disturbed due to tension during lamination.

These woven fabric 2 and display film 3 are pasted together via an adhesive layer 4 to form a laminate sheet 1-1. The adhesive layer 4 serves as a misalignment prevention layer and has a density of 0.924 g/ci.
Below, preferably 0.922 to 0.923H/an? .

Δ4FI3-12 g/l 0 mouth resistance, preferably 3.3
Formed by a laminate of ~3.8 g/10 m1n low density polyethylene. Raw material 431 fat density is 0
．． If it exceeds 924g/cl, foldability will deteriorate and M
If the FI is less than 3 g/10 m1n, the melting temperature must be adjusted to 5, and the orientation of the woven fabric 2 is relaxed by lamination, resulting in a decrease in strength, and the MFI is 12 LC/1.
If it exceeds 0IIIin, uneven thickness tends to occur.

The woven fabric 2 and the display film 3 are preferably laminated together by extrusion lamination 1-, but other methods such as dry lamination or R lamination may also be used. In this case, since the adhesive layer 4 is formed through the display section 6, it is desirable that the display section 6 be formed of a material with good melting and G properties. When the display part 6 is formed on the surface (outside) of the display film 3, the material should be selected in consideration of its fusion properties with the display film Q3 and its durability underground.
The sign 7 of the present invention is made by slitting the laminate sheet 1 formed as described above to a width of, for example, 150-20 On+m, and slitting it in the longitudinal direction as shown in FIG. A folded part 8 is formed by folding the folded part 8 at intervals, and a welded part 8 10 is formed in the overlapping part 9 formed by the folded part 8 by spot welding or the like.

The folding magnification, that is, the magnification at which the laminate sheet 1 expands when the welded portion 10 is broken, is usually 2 to 4 times, but can be arbitrarily determined depending on the location and soil curvature. In FIG. 2, the folding method is such that the tip of the folding part 8 overlaps with the adjacent folding part 8, but depending on the folding magnification, a folding method that does not overlap is also possible. Further, the overlapping portion 9 is usually made of three or five layers, but is not limited thereto.

The i11 young part 10 is not limited to a spot shape, but may be formed by partially attaching the overlapping part 9 to the t8, such as a broken line shape. , the welded part 1o is formed at the end thereof, but if the ends on both sides do not overlap, the i81 part 10 can be formed at any part of the overlapping part 9. It is desirable that the overlapping portion 9 be formed to withstand the tension during burying and to be easily destroyed during excavation.

[For production]

In the sign 7 constructed as described above, the laminate 1-sheet 1 is subjected to the sulin 1-processing, folded, and rolled up onto a core to form a product, but no fuzz is generated at this time.

No problems will occur due to entanglement. The manufactured sign 7 is embedded near underground objects such as gas pipes (usually above the object), and when it becomes a sign to indicate the location of the object, it is rolled up by inserting a finger or a stick. The markings 7 are laid while rotating the core, but the work is easy because no fuzz is generated.

When the buried sign 7 is caught by a power shovel or the like during excavation, the welded part 10 is destroyed and the laminate sheet 1 is expanded to indicate the location of the buried object. At this time, since the strength of the laminate sheet 1 is high, even if the buried soil hardens, the laminate 1-sheet 1 is pulled out without being cut in the middle, and part or all of the folded part 8 is released and the sign 7 is extended. , it is possible to reliably display the location of buried objects.

The woven fabric 21, the surface display film, and the adhesive layer 4, which are the materials of Lamiho 1 to Sheet 1, all have high durability underground, and since they are buried in a composite state, there is little loss of strength, and the long U, P (:;J).Furthermore, if the display section 6 is provided on the back side of the display film 3, the durability underground will be increased and accurate display can be performed for a long period of time.

In the above description, the woven fabric 2 of the laminate sheet 1
, display film 3 and adhesive F! There is no problem in providing another film or the like on the middle or outer surface of J4, or forming the display section 6 at a position other than the back surface. Also display film 3
is not necessarily required, and the display portion 6 may be formed on the woven fabric 2 or the adhesive layer 4. Furthermore, the folding method, polymerization method, etc. of the marker 7 are not limited to those shown in the drawings.

〔Example〕

Density 0.953g/cn? , MFI 0.80
A film with a thickness of 110 μm was made using high-density polyethylene of g/10 m1n, which was slit and stretched 7 times at a stretching temperature of 110°C, with a width of 2.8 and a thickness of 4.
2 /A, 1000 denier, strong/! Stretched tape 5 of 5.0 g/denier was made 1II2 and woven by a loom to a length of 9 pieces/inch and a width of 9 pieces/inch to obtain the woven fabric 2 shown in FIG. Width 82kq15cm
(tensile speed 20 cm/min, same applies hereafter) 6 On the other hand, density 0.021 g/an? , MFI 3.0
Thickness 50 made of low density polyethylene with g/10 n resistance
A display part 6 is formed by printing on the back side of the display film 3 made of a film of μ, and this and the woven fabric 2 are combined with a density of 0,'
J23(H/aj, M F 13.5(H/10m1
Extrusion lamination is performed through n low density polyethylene to combine the crystals.

A laminate sheet 1 having a width of 820 mm and having an adhesive layer 4 having a thickness of 30 μm was formed.

The obtained laminate sheet 1 was made into a 205mm wide sheet by
- As shown in Fig. 2; folded 3.5 times and formed welded parts 10 in two places at each overlapped part 9 using Suboso I-181 to obtain mark 7, but the slit end face was fluffy. There were no problems such as entanglement of fluff. Obtained 1;
The strength of #J in the longitudinal direction of the seam 1- of the welded part 10 of No. 11 and 7 is 4.5 (pulling speed 20 cm/min, the same applies hereinafter), and the strength of the longitudinal direction of the laminate sheets 1 to 1 is 82 g.
15cm (pulling speed 20cm/+oj n, the same applies below)
Met.

This marker 7 was laid at a position 50 cm underground while rotating the winding core, and the work could be carried out easily without any fuzz being generated. In this state, sign 7 was buried and later dug up with a power shovel.

It was confirmed that the marker 7 can be used as a buried object marker because the welded portion 10 does not peel off and the overlapping portion 9 does not stretch or be cut.

Comparative Example In the above example, width 7mm, thickness 17μ, 1000
Laminated sheet 1- 1 slit processing and mark 27
During the laying process, fluff was generated and entangled, making the work extremely difficult. In addition, the strength of the woven fabric 2 is 'AE 76 J/5
cm, 15 cm in width 72, sea 1-longitudinal peeling r4 of welded part 10 of mark 7 (1 strength was 4.5 kg, longitudinal strength of laminate sheet 1 was 70 kg 15 cm).

From the above results, it can be seen that the samples of the examples are less fluffy and have greater strength than those of the comparative examples.

〔Effect of the invention〕

According to the present invention, a laminate sheet having an fA woven fabric and an adhesive layer made of low-density polyethylene is folded to form an overlapping part so that the stretched tape made of high-density polyethylene does not fold in the width direction. , one side of the stretched tape can be bonded over the entire width, and as a result, no fuzz is generated during manufacturing and laying, making the work easier and providing a strong buried object aperture.

In addition, it has excellent foldability and flexibility, and the folded part can be extended to reliably indicate the location of buried objects without being damaged during excavation. Accurate display can be performed.

[Brief explanation of the drawing]

FIGS. 1 and 2 show examples, where FIG. 1 is a sectional view of a laminate sheet, FIG. 2 is a perspective view of a sign, and FIG. 3 is a sectional view of a conventional laminate sheet. In each figure, the same reference numerals indicate the same or corresponding parts, 1: Lamiho 1 to sheet, 2: woven fabric, 3: display film, 4: adhesive layer, 5: stretched tape, 6: display section, 7: sign, 8 is a folding part, 9 is an overlapping part, and 10 is a welding part. Agent: Patent Attorney Sei Yanagihara
115υ+1: t o month 711■. Incident display 1981 1. 'f Mi11 Application No. 17986f
iji2, name of invention buried object indicator 3, amend?

Claims (5)

[Claims] (1) A woven fabric of a stretched tape made of high-density polyethylene, which is woven so that at least the stretched tape in the longitudinal direction is not folded in the width direction, and a woven fabric made of low-density polyethylene bonded to one side of the woven fabric. A buried object comprising a laminate sheet having an adhesive layer of sign. (2) The buried object sign according to claim 1, which has a display film to which a laminate sheet is bonded via an adhesive layer. (3) The buried object marker according to claim 2, wherein the display film has a display portion printed on the adhesive layer side. (4) The buried object marker according to any one of claims 1 to 3, wherein the adhesive layer is formed by extrusion lamination. (5) The buried object marker according to any one of claims 1 to 4, wherein the welded portion is formed by spot welding.