JPS61196063A - Floor laying body and its construction method - 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 Industrial Application] The present invention relates to a synthetic resin floor covering that is laid on the floor of computer rooms, clean rooms, etc. that use flat cables, and is extremely useful as a floor covering. This is a construction method that allows for effective and useful use.

[Conventional technology]

Conventionally, multicore insulated cables with a circular cross section have been used for wiring in computer rooms. For this reason, as a means of wiring this cable, either: ■ Install a wiring bit on the floor of the building in advance and route the cable through this bit, or ■ Install the computer on the floor and then connect it between the computers. Place a cast iron cable duct and route the cables inside it. Alternatively, using the so-called free access floor wiring method, a large number of supporting metal fittings are placed on the concrete floor surface and the metal fittings are used.
Methods such as laying a floorboard of standard dimensions such as 50 x 450 mm or 600 x 600W, installing a computer on the floor board, and wiring cables using the gap between the concrete floor surface and the floor board are used. .

All of these methods are used for reasons such as preventing cable damage, maintaining the aesthetics of the computer room, and making wiring easier. However, although method (■) can be said to be the most basic method, it is necessary to determine the position and dimensions of the bits at the building design stage. Therefore, digging the bit is virtually impossible and cannot be called a realistic method. Method (2) is the simplest method during this type of wiring work.
Since a cable duct with a width of 600 nm is arranged, the height of the cable duct becomes high, which is inconvenient and undesirable in terms of walking, cleaning, and aesthetics. Method ① does not require the installation of bits, 1. The existing concrete floor can be used as it is, and all cables can be routed in the gap under the free access floor, so the cables are not exposed above the floorboard. Therefore, there is no need for cable ducts, maintaining the aesthetic appearance and requiring only two steps to clean.

This can be said to be an extremely superior wiring method in terms of maintenance, etc. However, if the floorboard requires a board (for example, plywood or cast aluminum board with a thickness of 15 to 20I1m) that is strong enough to withstand the work and walking of the operator, and floor decoration is also required, Since it is necessary to provide this kind of decorative layer, it becomes very expensive. Furthermore, a large number of metal fittings are required to support these floorboards, and the cost thereof is also not negligible.

As a proposal to overcome the drawbacks of these methods, a flat cable with a thickness of about 1 wn was developed in place of the conventional cable with a circular cross section. The flat cable (B) has a conductor (wire core) as shown in Figure 2.
(4) is covered with an insulator (5) and conductors are arranged in rows to form a cable with a flat structure as a whole, and the thickness (outside diameter of the insulator) is approximately 0.9 to 0. 9
5 m, the number of wire cores is arbitrarily designed from 14 to 64, and it is possible to add or reduce the number of wires as necessary, and the width is 1.
18wnn for 4-wire core, 80mm for 64-wire core
That's about it.

Compared to circular cables, this flat cable can increase wiring density, can be protected by a low-height cable cover even when wiring is on the floor, and can be installed on the underside of the floor covering even when using a type of floor covering. Various points have been cited as advantages, such as the ability to wire to However, in actual wiring, the drawbacks of the above-mentioned wiring methods (1) to (3) have not yet been overcome, and this characteristic is only achieved in combination with tile carpets. Tile carpet is made by cutting regular wide and long carpet into square lengths of 500 x 500 nm.It can be installed by laying the cut carpet on a concrete floor or temporarily using double-sided adhesive tape. It is done by gluing. Therefore, in the case of wiring such as telephone lines, the wiring is carried out using a flat cable as appropriate and then covered with a tile carpet. This carpet has a raised surface! Because it is covered by 11,
The bulge caused by the flat cable is not very noticeable, and when relocating the carpet, it is easy to remove the existing tile carpet and reinstall it.

[Problem that the invention seeks to solve]

However, other flooring materials, such as plastic sheet flooring, vinyl tiles, and rubber tiles, do not have these characteristics found in carpet tiles, so the wiring methods described in (1) to (3) must still be used. The current situation is that we have no choice but to do so. Particularly in recent years, the problem of static electricity caused by human body charging has become a focus in computer rooms, clean rooms, etc., and conductive floor coverings have been adopted as a countermeasure. There is an urgent need to solve this problem in wiring methods.

[Means to solve the problem]

The present invention has been made in view of the current situation, and is a conductive material having a predetermined conductivity, which is a mixture of non-conductive colored thermoplastic synthetic resin particles and conductive carbon black powder, conductive metal powder, or a mixture thereof. and thermoplastic synthetic resin particles at a predetermined ratio, and compacted by heating and pressurizing to form a decorative surface layer, and conductive carbon black powder, conductive metal powder, or these materials are coated on the back side of the decorative surface layer. A floor covering is provided with a thermoplastic synthetic resin foam layer mixed with a mixture and having a conductivity of at least 1010 Ω (the smaller the insulation resistance value of 1010 Ω, the greater and better the conductivity). The thermoplastic synthetic resin foam layer has a foaming ratio of 2 times or more and can be easily crushed by heating and compression. After placing and wiring on a surface, the floor covering is adhered from the top surface with an adhesive, the floor covering is heated from the upper surface of the flat cable wiring part to soften it, and then the floor covering is pressed. This method attempts to solve the above-mentioned problems by crushing the foam layer of the back layer and burying the flat cable in the foam layer, thereby making the surface of the floor covering flat.

〔Example〕

An example of the implementation of the present invention will be explained with reference to the drawings. The thermoplastic synthetic resin is a soft vinyl chloride resin.

Soft synthetic resins such as vinyl acetate-ethylene copolymers are suitable, and blend polymers such as NBR, chlorinated polyethylene, thermoplastic polyester resins, polyurethane elastomers, and acrylic resin elastomers can also be mixed and used as appropriate.

The decorative layer as the surface layer (a) is composed of non-conductive colored thermoplastic synthetic resin particles (1) and conductive thermoplastic synthetic resin particles (2).

Therefore, the color scheme of both these colors is extremely important in determining the decorative effect of the floor covering, and the color scheme of both of these is extremely important in determining the decorative effect of the floor covering.
(2) Particle size and softening degree (meltability) characteristics upon heating are also important factors in determining the surface characteristics of the floor covering.

The non-conductive colored particles (1) and the conductive particles (2) are once processed into a sheet by an extrusion method or a calendar method, and then crushed by a crusher and classified into a predetermined particle size before use. The particle size is usually 0.5-5. The range of OR is good,
Therefore, a suitable sheet thickness is about 1.5 to 2.5 m.

The non-conductive colored particles (1) are a major factor in determining the color of the floor covering, but this must be considered in conjunction with the color of the conductive particles. The conductive particles (2) are produced using conductive carbon black powder, conductive metal powder, or a combination of both. These powders as conductivity imparting agents are carbon black and aluminum powder.

Copper powder and the like are used, but all powders other than flaky aluminum powder are black or dark brown. The conductivity level varies depending on the use and purpose, but it is necessary to set the conductivity level to 1010Ω or more, and this value corresponds to an amount of carbon black powder added of 5% or more. In the case of aluminum powder, care must be taken because the amount added and its conductivity vary greatly depending on whether the shape is flake-like or 9-particle. For aluminum flakes 1010
To obtain conductivity and electrical properties at the ohm level, it is necessary to add 10% or more, but in the case of particulate aluminum, it is more than twice that amount. Therefore, it is desirable to use a mixture of flake aluminum and particulate aluminum. Unlike particles using black carbon black, conductive particles made of aluminum powder provide white particles, which increases the degree of freedom in color design.

The mixing ratio of the non-conductive colored particles (1) and the conductive particles (2) is an important factor in determining the conductivity of the floor covering as a whole; layer (b)
This must be considered in conjunction with the conductivity level of the conductive synthetic resin foam layer.

Acetylene black was used as conductive carbon black powder, and the amount added to the conductive particles was 5%, 8%, and 18%, and the conductivity of the conductive synthetic resin foam layer was 8 x 10'Ω.
In this case, the conductivity of the obtained floor covering is as shown in Table 1 and FIG.
Change.

(Continued on next page) Table 1 According to Table 1 and Figure 7, when the amount of carbon black powder added is 5% conductive particles, the level of lXl010Ω, which is evaluated as a conductive floor covering, can be reached. is the case where the conductive particle mixing ratio is 30% or more, and is in accordance with the NFPA standard (
National Fire Protection
As5ocation5standard)
lX1G'~2.5×104Ω specified in
The carbon black powder addition rate falls within the range of 18%.
This is limited to cases where 25% or more of the particles are mixed. These values also vary depending on the conductivity level of the conductive foam 11(b) on the back side, but in the above case, if the conductivity of the back layer (b) is 4 x 101Ω, the addition rate of carbon black powder is 8%. The particles also exhibit conductivity of 1×10'Ω or more at a mixing ratio of 25% or more.

The conductive synthetic resin foam layer (b) of the back layer is basically required to have a conductivity of 10'Ω or more as described above, but at the same time, in order to enhance the burying effect of the flat cable (B), the foam layer (b) is It is necessary to have a magnification of 2 times or more and a composition that is easy to crush when heated and pressurized. Back layer (
The thermoplastic synthetic resin and conductivity imparting agent used in b) are optimally of the same quality and type as the conductive particles; There are no particular limitations on the resin and conductivity imparting agent that can be obtained.

The conductivity level of the back layer (b) is particularly important. In the case of the back layer having the above-mentioned 8 x 10'Ω and double expansion ratio, the amount of conductive carbon black powder added is 8%.
but with a higher conductivity level, e.g. 6 X 1G
“To make it Ω, 12% addition is required, and 2
For 1G', an addition amount of 18% is required, and even if the addition amount is higher than that, the increase in the conductivity level is extremely small. In this case, it is important to add a calcium carbonate filler to obtain a floor covering that is easily crushed during heating and compression and maintains an expansion ratio of 2 times or more. A balance of agents is necessary.

The expansion ratio and crushing properties are closely related to the amount of calcium carbonate filler. When looking at the addition ratio to the total amount of resin and plasticizer, it is optimal to be around 1:0.5 to 1:1; if it is less than this, the foaming ratio can be increased, but the crushing properties will decrease, and if the ratio is more than this, In this case, the crushing properties will be improved, but it will be difficult to obtain a high expansion ratio.

The conductive foam layer on the back side has moderate cushioning properties at room temperature, but is extremely easily crushed by compression under heating conditions of 100 to 120°C. Therefore, place this floor covering (A) on the flat cable (B) and heat it to around 120°C by contacting an infrared heater or hot oil circulation heater (D) from the top surface of the floor covering. When the floor covering (A) is compressed, only the foamed Jl (b) that is in contact with the flat cable (B) portion is crushed (b'), and the rest is not crushed, so the surface of the floor covering after compression is slightly Although traces will remain, the finished surface will be flat with almost no ridges caused by the flat cable (B).

A conventional similar floor covering without conductive particles and a conductive foam layer, i.e. the particle layer is all non-conductive colored particles, and the foam layer is also a normal foam layer that does not contain a conductivity imparting agent. In this case, it takes a very long time for the heating from the flat cable abutting portion to reach the foam layer on the back layer, and the crushing effect cannot be obtained as easily and reliably as in the present invention.

This fact suggests that the presence of these conductivity-imparting agents acts extremely effectively on heat conduction due to an unexpected effect of the conductive particles and the conductive foam layer.

Heating with a gasoline burner is also effective for heating the raised portion using the flat cable (B) wiring. In this case, the surface of the decorative particle layer may be repeatedly compressed flat with a handler (e) while directly applying a flame to the surface. The particle layer shows almost no gloss and has a good finish.

In the case of non-conductive floor coverings, when such work is performed, scorching and discoloration occur on the surface layer that is exposed to the flame, but in the case of the floor covering of the present invention, such adverse effects will not occur. almost never occurs.

The manner in which the floor covering (A) is laid is explained with reference to Fig. 6. After placing the flat cable (B) on the concrete base (G), the adhesive ( Apply C) using a comb trowel. Then, the bedding body (A) is placed on the top surface and adhered.

The floor covering (A) on the flat cable (8) is connected to the cable (
It is raised by the thickness of B). A heating plate (D) with a built-in heater that is heated to 150°C is brought into contact with this raised part through an aluminum foil (S) and heated for 5 minutes, and then a hand roller (e) having a smooth roller (E) is heated. ) to compress the raised part of the flat cable, the floor covering (
It is finished flat like the smooth part (A') in A). Floor covering (A
), the flattened part (A'') is shown in Figure 5 (the foam layer is crushed and the original foam layer (b) is
It changes into a crushed foam layer (b').

Although Figure 6 is a diagrammatic explanatory diagram, the relative dimensions are different, but in reality, it is sufficient to use a roller (E) that is slightly wider than the width of the flat cable (B), and a roller with a length of 1100n is sufficient. be.

Next, specific aspects of the present invention will be described. (1) Production of non-conductive colored thermoplastic synthetic resin particles/vinyl chloride-vinyl acetate copolymer resin (polymerization degree 800)
．． Contains 5% vinyl acetate) 100 parts by weight...DOP 55 #Epoxidized soybean oil 3 Stabilizer
3/7・Titanium oxide 5
〃・Pigment Appropriate amount In this case, the pigment was selected to make two types of sheets: a dark brown sheet and a light brown sheet. After obtaining a sheet with a thickness of 3 tm using an upright two-roll calender, it was put into a crusher. to obtain non-conductive colored particles having a particle size of 1.0 to 2.5 WI.

According to the above formulation, carbon black addition rate is 5%, 8%,
A 3.0 m thick sheet of 18% was pulverized in the same manner as in (1) to obtain three types of conductive particles.

(3) Production of foamable conductive thermoplastic synthetic resin layer - Vinyl chloride resin (straight polymer, degree of polymerization 1000) 29.0 parts by weight - DOP 18.0.

・Blowing agent (azodicarbonamide) 1.8〃 ・Stabilizer 1.2〃・Filler (calcium carbonate, heavy) 38.0# ・Carbon black (acetylene black) 12.0# Reverse the above mixture Using four calender rolls, apply a silicone mold release agent onto a glass cloth (thickness 0.3wna).1.
Laminated to a thickness of 5R (0.75an*X 2nd layer), cooled, and wound into a roll.

(4) Production of floor covering The colored particles obtained in (1), which is a 1:1 mixture of dark brown particles and light brown particles, and (2), which has a carbon black addition rate of 18%.
The conductive particles obtained in (3) are mixed in advance so that the conductive particles account for 30%, and the mixture is placed on the foamable conductive synthetic resin sheet produced in (3) using a doctor roll method to a thickness of 3. It spreads to .0 dragons. Next, the particles are passed through a preheating furnace at 140°C to heat and soften them, and then the roll gap is 3.8.
2. Pass the particle layer between the two clearance embossing devices.
Press on. Then, the mixture is again introduced into a foaming furnace heated to 220° C., and the foam layer is foamed to about 3.5 times its original size. At this stage, a foamed sheet with a total thickness of 7.5 to 7.8 wm was obtained.

The foam sheet discharged from the foaming furnace is passed through a clearance embossing device with a clearance of 4.3 wm through the roll gap while heating the particles on the upper surface with an infrared heater and cooling the lower surface (glass cloth m> with cold air) to give a total thickness of 4. A foam sheet with glass cloth of 4 to 4.5 R was obtained. After cooling, the glass cloth was peeled off and removed to obtain a floor covering (A) with a thickness of 4.2 to 4.4 nm. This floor The composition of the mat was as follows.

Decorative particle layer thickness: 1.0-1.2R foam layer
3.2-3.3mm foaming ratio
2.13 to 2.2 times This floor covering is extremely beautiful, with light brown and dark brown particles and black conductive particles almost evenly distributed, and its conductivity level is 2X10s.
It had excellent conductivity at Ω.

The resulting floor covering has an electrical conductivity of 2. OX 10'Ω,
This floor covering has a back layer foam layer with a foaming ratio of 2.2 times, and also has excellent flat cable installation properties.

〔Effect of the invention〕

The bedding body of the present invention and the construction method using the bedding body when using a flat cable have the following nine features and effects.

The first feature is that the back layer is conductive and is a foam layer, resulting in a conductive floor covering with excellent cushioning properties.

This type of bedding is a new bedding that has never been seen before.

The second feature is that it has the first feature, so even if a flat cable is routed on a concrete surface and a floor covering is covered and constructed from the top surface, the raised part is heated and compressed to create a flat cable. The advantage is that the raised area caused by cable wiring can be flattened.

The third feature is that conductive particles are present in the decorative layer, and the back side is a conductive foam layer, and these are fused and connected to each other (as a result, the performance of the conductive floor covering is heat transfer is extremely easy, and the back foam layer is easily softened by heating from the decorative layer, making it possible to easily crush it by compression.

Moreover, the floor covering of the present invention has a back layer having a conductivity of at least 105 Ω or more, a foam layer with a foaming ratio of 2 times or more, and a foam layer that can be easily crushed by heating and compression. Because of this, it has excellent crushing characteristics for flat cables, and does not impair its electrical conductivity in any way.

[Brief explanation of drawings]

The drawings show an example of the implementation of the floor covering and its construction method according to the present invention. Figure 1 is a sectional view of the floor covering, Figure 2 is a sectional view of a flat cable, and Figures 3 to 6 show the construction order. Figure 7 is a table showing the relationship between conductive particle mixing ratio and conductivity, in which (A) is the floor covering, (8) is the flat cable, and (a) is the surface. The layer (b) is the back layer, (1) is the non-conductive colored particles, and (2) is the conductive particle.

Claims (3)

[Claims] (1) Conductive thermoplastic synthetic resin particles having a predetermined conductivity mixed with conductive carbon black powder, conductive metal powder, or a mixture thereof, and non-conductive colored thermoplastic synthetic resin particles are mixed into a predetermined mixture. A foamed thermoplastic synthetic resin having conductivity mixed with conductive carbon black powder, conductive metal powder, or a mixture thereof on the back side of the decorative surface layer is formed by mixing in the ratio of A floor covering characterized by having layers. (2) The thermoplastic synthetic resin foam layer has a thickness of at least 10^5
2. The floor covering according to item 1, which is a foam layer that has an electrical conductivity of ohm or more, has a foaming ratio of 2 times or more, and can be easily crushed by heating and compression. (3) After placing and wiring the flat cable on a predetermined floor surface, from the top surface, the back layer is made of a conductive thermoplastic synthetic resin foam layer, and the surface layer is made of a non-conductive colored thermoplastic synthetic resin. A decorative layer consisting of particles and conductive thermoplastic synthetic resin particles mixed in a predetermined ratio and pressed together by heating and pressure is bonded to the floor surface with an adhesive, and then the flat cable is wired. The floor covering on the top surface of the section is heated and softened, and then that part is pressed, the foam layer on the back layer is crushed, and the flat cable is buried in the foam layer, so that the surface of the floor covering is finished flat. Features: Construction method for floor coverings.