JPS6344957A - Protective sheet for painting - Google Patents

Abstract

PURPOSE:To obtain an inexpensive protective sheet having high paint absorbing capacity, excellent in flexibility and air permeability and having high covering effect at the time of painting work, by using a perforated film wherein a thickness, a perforation size and a perforation density are specified. CONSTITUTION:The perforated film used for a protective sheet is prepared, for example, by embossing a proper pattern to a film composed of polyolefine and stretching the same in a biaxial direction not only to orient the material of the film but also to fibrilate the thin wall part thereof. At this time, the material is so processed that the thickness of 0.001-0.2mm and perforations having a size of 0.1-5mm and density of 1-5,000/cm<2> are arranged substantially regularly. This perforated film is superposed to various fiber fleeces or a different kind of a perforated film and 2-20 sets of the superpositions are fused to form the protective sheet.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a novel sheet for covering and protecting articles that are not to be contaminated by paint during painting work. The present invention has an excellent protective effect particularly on plants such as shrubs as a coated article. Furthermore, the present invention has excellent paint exhaustion ability, and has the ability to prevent paint particles from scattering into the air and from spreading contamination.

(b) Conventional technology Paper coatings have been widely used since ancient times to prevent contamination during painting work. Covering with paper has the advantage of being inexpensive and quite durable, but it is difficult to cover objects with complex shapes without gaps because of its lack of flexibility. Furthermore, since the paint absorption capacity is not sufficient, the paint often passes through and causes contamination. In particular, problems tend to occur when the product is used in close contact with the object to be protected.

Further, if a large amount of paint accumulates on the paper surface 1111, there is a problem that droplets are generated and flow down to contaminate the floor. Additionally, because the surface is smooth, the colliding paint particles are not exhausted, and the repelled particles scatter into the air, causing contamination to spread far away.

Plastic films such as polyethylene are also often used as an alternative to paper. Covering with Filno is more durable than paper, and is superior to paper in terms of flexibility, but if it is covered without any gaps, if the object to be protected is a living thing, it will absorb the Ilf. As a result of interfering with the plant and suppressing ventilation, it may cause high temperature damage and high humidity damage, resulting in poor growth and, in extreme cases, death. In addition, the protective coating obstructs ventilation, often causing accidents such as oxygen deficiency and poisoning on the painting workbench.

In order to solve these problems, it is widely used to use nato straw products, various old cloths, inferior cloths, etc., but the materials are not uniform, they are generally expensive, and they are difficult to clean after use. There were problems with many items being difficult to dispose of.

(c) Problems to be Solved by the Invention The present invention is a protective sheet for painting that is inexpensive, highly flexible, highly breathable, has a large mt+ exhaustion power, and has excellent covering effects and protective abilities. .

(d) Means for solving the problems The present invention has a thickness of 0.001 mm to 0.2 mm, a pore diameter of 0.1 mm to 5 mm, and a pore density of 1 to 5000 pores/
This is a protective sheet for painting that is mainly made of a film having substantially regular pores of cm2 in size.

Although any material may be used for the film, it is preferable to use a material that is inexpensive and easy to form into a film, such as polyolefin.

The porous film of the present invention may be in the form of a normal film in its continuous portion, but it may be fibrillated into several pieces. It is preferable to have irregular branching or fluff. The shape of the hole may be circular, but it may also be polygonal or even irregular. The diameter of a non-circular hole is the diameter of a circle with the same area.

In the present invention, the porous film used for the protective sheet is manufactured by, for example, embossing a suitable pattern on the film and stretching it biaxially to orient the material and at the same time fibrillate the thin portion. The pattern to be embossed may be of any type, and the pattern may be pierced through the film to form holes.

In the present invention, as another method for manufacturing the porous film used for the protective sheet, cutters of various shapes such as needles and cylinders,
There is a method of making holes in the film using pulsed discharge, laser light, etc. In this case, it is preferable to heat the needle or cutter and process it so that the area around the hole is raised, as this makes the film soft to the touch. In particular, a film in which the periphery of the hole is raised toward one side of the film is particularly soft and preferable. In this method it is also possible to further stretch the apertured film.

In the present invention, the number of porous films used in the protective sheet may be one, but preferably 2 or more and 20 or less, most preferably 3 to 10. It is preferable to provide some closure, adhesion, fusion, etc. between each porous film.

In the present invention, various fiber fleeces, various network structures, different types of porous films, foams, or a combination of these can be further superimposed on the porous film used for the protective sheet. can.

Preferably, these are used by being fixed by adhesion, fusion, or entanglement. The number of sheets to overlap is 2 or 2
0 sheets, especially 3 to 10 sheets is preferable.

The layered fiber fleece has excellent paint absorption properties, and has an excellent ability to prevent the paint applied to the protective sheet from transferring to the article it is coated on.
It has the ability to prevent the scattering of 1.

In particular, sheets with erect fibers have an excellent anti-slip effect, and are effective in preventing the protective sheet from being blown up by the wind and preventing workers from slipping and falling.

As the fiber fleece, a carded web, a web immediately collecting and accumulating fibers to be spun, a random web, etc.5 can be used.5 It is preferable to mix thermobondable fibers with the fiber fleece.

The heat-adhesive m-fibers not only have the ability to stabilize the form of the fiber fleece itself, but also can be used to adhere to other layers to be superimposed. Further, a separate adhesive may be used, or the porous film may be thermally melted and bonded.

As a net-like structure, fibers or split yarns may be arranged and glued together at their intersections, or formed into a net-like structure by stretching during melt extrusion or in a subsequent process, for example, a structure substantially substantially in the longitudinal direction Jj. A thread row consisting of a first polymer arranged in a downward row, a thin branch made of a polymer having a lower melting point than the polymer and embedding the thread row, and a large number of other thread rows almost perpendicular to this branch. It is a net-like material consisting of

The protective sheet for painting of the present invention can be used by covering the article to be covered up to i, but it is also possible to do so without pasting it together using adhesive tape, or by pasting it together using heat or adhesive. It is also possible to secure it with a button or sewing thread. It is also possible to mold the material into a bag before covering it.

The protective sheet of the present invention can also be used in conjunction with other films. In this case, it is possible to accommodate support ropes and weights to prevent movement and deformation of the protective sheet.

The protective sheet of the present invention can be used by being colored in various colors.

Example 1 Polyethylene with an MFR of 5.3 was extruded from a linear die, and before the polyethylene solidified, an embossed material 17 having two types of groups arranged in descending directions in opposite directions with a surface temperature of +05"C was extruded. A film with regularly formed diamond-shaped protuberances was made by sandwiching the film between two ducks having a rough surface, and was stretched biaxially to obtain a porous film. The film has a date of 8g, 7m2, a maximum thickness of 0.08 mm, and a pore size of 0.
7-0.9 mm pore density was 85 pores/cm', and in the part where the thickness had been thinned due to elongation, young 1 fins were produced, making it irregular, and some fluff was 11.

Three sheets of this porous film were stacked to cover the plants (→) Tsuki, Boxwood, Tsuba A, Yatake, Kannon Deku) and a nearby building was painted with Ichi IIk 1°1 (=t & 1 painting).

After 8 hours of work at an outside temperature of 6°C and a humidity of 42-562°C, the covering was removed and the condition of the plants was checked, and no abnormalities were observed.

Comparative Example 1 Instead of the thick film of Example 1, JV thickness 30μ
When a polyethylene film of m [1 was used, many yellow spots appeared on the east side of Satsuki, the leaves of Tsuke, Camellia, and Yatake fell, and Kannonchiku withered and died. The cause of the damage is presumed to be high temperatures caused by the greenhouse effect.

Comparative Example 2 When newspaper was used instead of the porous film in Example 1, no abnormalities were observed in the health of the plants, but the coating on three of the ten samples was torn, and the coating was damaged due to paint contamination. This is extremely difficult to repair.

Example 2 Polyester fiber JV (fabric weight 25 g/m') containing 15% polyethylene binder fiber (core-sheath type) was layered on the porous film of Example 1, and hot air was blown from the web side to perform fusing treatment. Ta.

This sheet was used to partially paint a car. cam
This sheet was attached to the unpainted area using tape and spray painted. The area to be painted is approximately 1m'.
A piece of white Kent paper was placed approximately 1 ml horizontally from the painted surface to check for contamination. The contamination of the Kent paper was negligible after one coat.

When newspaper was used in place of Comparative Example 3-8-C in Example 2, it was determined that the gamma staining of the Kent paper was significant and the air pollution was also significant.

Example 3 Volip I7 pyrene with MFR of 4.5 was used, and the surface temperature was 15 before extrusion from a linear die and solidification.
A hexagonal ridge is sandwiched between the 5°C embossing roller and the lower surface of the underhill roller.
After molding so as to remain as intended, biaxial stretching was performed to obtain a porous film. This porous film [with 1] is 8g/
Mouth 12, I at the thickest point! J size 006mm, hole diameter I, 2-1,! 5mm, hole density 60/cm
It was 2.

This porous film is coated with a single oval jewel (weighing 10g/
m', the density of the threads in the J-L direction is 220 threads/I, and the density of the threads in the width direction is 800 threads/rn), which are heated in dots with a diameter of 2 mlTl at approximately 1 cm intervals. ,Example
When a painted cover was made for plants in the same manner as in 1, the protection ability against soaking was reduced.

Example 4 A mixture of nylon 6 with a molecular weight of 15,000 and 30% by weight of low density polyethylene MFRIl, O was extruded through a linear die and solidified, and then an embossing roller with a surface temperature of 205°C was used. The film was sandwiched between a flat-surfaced duck roller and molded to leave an approximately square ridge, and then biaxially stretched. The resulting porous film had a diameter of 5 g/m2, a thickness at its thickest point of 0.05 mm, and a pore density of 12 7 m2.

An adhesive was applied to this porous film, and a nylon flock (fiber length: 1 mm) was adhered using static electricity at a density of 80 g and 7 m 2 . This sheet was used as a floor cover when painting the inside surfaces of houses, and its protective properties were lost.It also had a great anti-slip effect and stabilized the position of ladders and stepladders, making it extremely easy to work with. .

(f) Effects of the Invention The protection for coating of the present invention-1- is for coating plants such as plants.
1, and also protects plants from high temperature damage and high humidity damage. It also has the ability to suppress the coating 11 from scattering during painting, and has a small protective ability when used in general painting.

Claims (1)

[Claims] Thickness 0.001mm to 0.2mm, hole diameter 0.1mm
A protective sheet for painting whose main material is a film having substantially regularly arranged pores with a diameter of 1 to 5 mm and a pore density of 1 to 5000/cm^2.