JPH02501630A - Friction surfaces such as packaging flakes with friction surfaces - 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] Friction surfaces such as packaging flakes with friction surfaces The present invention relates to a friction foil of a material such as resin paper having a friction surface.

Difficulties can be encountered in depositing sheet packaging packages that remain insufficiently on top of each other. This can be done by using a rounded outer package of sturdy material such as cardboard. This, of course, significantly increases costs.

Friction foils with an adhesive surface have been proposed, but this requires a significant area of adhesive. It is expensive because it is essential.

Also, in dusty environments, the adhesive surface becomes covered with impurities and dust. , loses its good friction properties. In addition, packaging flakes with an adhesive surface can be used for packaging and difficult to use.

It has also been proposed to sprinkle small pieces of resin flakes of the same resin at the manufacturing stage. , which results in a friction surface without adhesive, high friction values and high mechanical It has both physical and physical strength. However, manufacturing this type is expensive. However, it is applicable only to very limited types of thin sections. All packages deposited If the page has this type of lamina, the plastic piece of the friction lamina will help attach the binding lamina. This can also be done by gluing a thin strip on top of the package to prevent Binding packages together is difficult.

The main aim of the invention is to avoid or minimize the aforementioned disadvantages. According to the present invention The friction surface is made of thermoplastic hot melt made by screening method. formed into flakes by a coating having the shape of dots or other shapes of

The coating is preferably transparent or colorless, but may also be colored. hotmel 2-15 g/m2, most preferably only about 3 g/m2. the friction The flakes can be used as finished products after a short cooling time and covered with adhesive. Expensive evaporation line or packaging for any solvents such as those applied to friction surfaces to be covered Doesn't need law. The product does not contain volatile substances such as solvents in dispersion adhesives. stomach.

The friction foil according to the invention is very economical to produce and therefore such as product packages, fertilizer bags, timber covers, raw material bags and large material packages. It may also be used as packaging for inexpensive materials. Food packaging deposits on friction surfaces It would be very difficult to do so without it, and the product wrapped inside the package would be destroyed if dropped. It can be a loss.

The flakes may be used as anti-slip devices during transport.

By using the product according to the invention, when filling double bags, the inner bag It is possible to prevent slipping during filling, and the mouths of both bags can be placed over a short distance. It is possible to bond by reheating the same coating, and since the contact surface is wide, it is difficult to press. No pressure is necessary.

By using screening methods, very small quantities of hot melt can be can be dispersed in a controlled manner onto the thin surface, making it possible to manufacture friction surfaces using large Don't cover the costs.

Since the coating according to the present invention is carried out by a method such as a screening method, it is possible to It is possible to coat only the flakes, which can further reduce costs. Therefore, it is also possible to print text on the same flake after coating the friction surface of the flake. It is. This can be done, for example, by spraying small pieces of resin flakes during the production stage of the resin flakes. This is not possible for friction surfaces created by hot melt dispersion unit , can act as part of the press or as an extension of the press, thereby Therefore, the increase in manufacturing costs for creating a friction surface is significantly smaller.

The application of thermoplastic melts to packaging foils is well known per se, e.g. Disclosed in RAND Patent No. 71263.

The coefficient of friction of a completely smooth resin flake is generally high, but Even a small amount of dirt, such as cleat dust, aggregate dust, or pollen dust, can significantly increase the coefficient of friction. can be significantly reduced. In bag packaging, it is important to have smooth surfaces against each other. is not possible. The friction of the coated flakes according to the invention relative to the uncoated flakes is and at least double, and when two frictional flakes are against each other, the total friction is , even higher, approaching the value of 1 in the most favorable conditions.

When the packaging foil is thick, the filling material of the thermoplastic melt can be e.g. For example, calcium phosphate, magnesium silicate, silicon dioxide or a combination thereof. It is possible to use filler materials such as those described in U.S. Pat. No. 3,691,120. It is known per se by the number.

The screening surface may be modified by known methods in the upper and lower surfaces; Its overall effect results in favorable cohesion.

If the packaging foil is easily damaged, the shape of the screening dot should be designed to scratch the surface of the foil. Something non-injurious is chosen, for example hemispherical dots in an evenly distributed pattern. .

The invention will be further described by way of example with reference to the accompanying drawings, in which: FIG. 1 is a cross-sectional view of the friction foil according to the present invention, and FIG. 2 is a cross-sectional view of the friction foil of FIG. FIG. 3 is a schematic illustration of the production of a flake according to the invention. be.

In the drawing, the lamina 1 consists of a plurality of conical protrusions of dots, each with a flat top. It is covered with a coating 2 comprising: The dots are screened as shown in Figure 3. This is provided by the The screening roll 3 has a cup-shaped recess 4 and is partially immersed in hot melt 6 contained in vat 5. Screeni When the rolling roll 3 rotates, it lifts the hot melt from the vat and thereby The melt in the cup 4 passes between the press roll 7 and the screening roll 3. The melt is transferred to the running flake 1, and the melt covers the dot-shaped coating of the protrusion. It adheres to the surface of the flake so as to form. Scraper 8 removes any excess holly. The hot melt is removed from the surface of the screening roll. Screening force In the cup, the hot melt forms protrusions on the thin surface, and the height of the protrusions is about 50-150 mm. [mu]m, and the protrusions are dimensioned in such a way that they form the desired pattern.

cold moon Low-density polyethylene flakes, whose thickness was 0.2 mm, were prepared using the apparatus according to Fig. 3. The viscosity of ethyl vinyl acetate is 100 OCP at a temperature of 140°C. coated with a hot melt consisting primarily of Depth of screening cup 4 The diameter of the cup was 0.12+mi and the diameter of the cup was Im. Do from each other The distance between the spikes was 4 mm. The finished product can be used to make bags It is Noh.

FIG, I FIG.2 FIG.3 Submission of translation of written amendment (Special note Article 184 (D’8 ##)

Claims (8)

[Claims] 1. made of resin, paper or other sheet or other material with a friction surface Friction surfaces such as flakes (1) are covered with dot-shaped protrusions or other shaped protrusions. The covering (2) covers the parts of said flakes (1) or such parts that require improved friction. A friction member characterized in that the part is formed and provided with thermoplastic hot melt. Rubbing surface. 2. The friction surface according to claim 1, wherein the coating is transparent or colorless. A friction surface characterized by being either. 3. In the friction surface according to claim 1, the coating may be colored. A friction surface characterized by. 4. In the friction surface according to any one of claims 1 to 3, The coating is in the shape of a plurality of dot-like protrusions, and the height thereof is 50 to 150 m. A friction surface characterized by: 5. The friction surface according to claim 4, wherein the coating (2) comprises a truncated pyramid. A friction surface characterized by being formed of a plurality of dot-like projections having a dot shape. 6. In the friction surface according to any one of claims 1 to 5, A friction surface characterized in that the area unit weight of the coating is 2-15 g/m2. 7. In the friction surface according to any one of claims 1 to 6, Said covering (2) of the protrusions is provided by using a screening method. A friction surface characterized by: 8. In a method of increasing the frictional properties of surfaces such as flakes, screens or Other techniques may be used to A person who has a procedure for applying a coating of thermoplastic material from hot melt to such parts. Law.