JPS6010825Y2 - Expanded polyolefin resin plate with giant air bubbles - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a foamed polyolefin resin plate having giant hollow air cells.

Conventionally, foamed polyolefin resin plates have been widely used in thin sheets with fine air bubbles, but the inventor of the present invention conversely made the air bubbles huge, thereby creating various types of resin that had not been seen before. They discovered that it is possible to make a foam that has an effect, and came up with the present invention.

The present invention is an extruded foamed polyolefin resin plate having a thickness of 3 to 50 wn, comprising 2rIrIn or more, 1
Giant medium-sized air bubbles consisting of nearly spherical closed cells with a cell diameter of ( ) mm or less occupy 60% or more of the total volume of the foam plate, the thickness of the cell membrane is 0.1 mm or less, and the cells in the skin are The film is exposed and an uneven pattern is formed on the surface, and 30
The gist of the present invention is an extruded plate of a foamed polyolefin resin having large medium-sized air bubbles, which is characterized by an expansion ratio of ~8o@.

Examples of the polyolefin resin used in the present invention include polyethylene, polypropylene, polybutene, and copolymers of these resins.

Among them, low-density polyethylene is suitable for forming a foam plate-like body having a high expansion ratio.

The foamed polyolefin resin foam plate of the present invention has 3 to 5
It is a plate-like body with a thickness of 0rrrIn, and 2rran
Giant medium-sized air bubbles made of S spherical closed cells having a cell diameter of 1 or less occupy 60% or more of the total volume of the foam plate.

Each bubble has a spherical shape, but the bubble membranes where the bubbles are in contact with each other form a polyhedron.

That is, adjacent cells share a cell membrane, and the cells are formed continuously.

The thickness of the bubble membrane is extremely thin, less than 0.1 m, and generally about 0.01 to 0.05 m.

Although microscopic air bubbles are present in the corners surrounded by the large medium air bubbles, the large medium air bubbles account for more than 60% of the total volume.

Giant medium air bubbles have a bubble diameter of 2 to 10 m, but if the number of questions is 2 or less, the unique effect of giant medium air bubbles cannot be fully demonstrated.

Moreover, if it is 1 or more, it is difficult to take the form of a foamed plate-like body.

It is preferable that the giant medium air bubbles have a uniform diameter, such as ICF+! It is preferable that the number of bubbles per unit is 16 to 25 and that there are few fine bubbles.

To explain the drawings, numeral 1 is a foamed polyolefin resin plate, and numeral 2 is a giant air bubble.

The giant medium air bubbles 2 are in contact with adjacent giant medium air bubbles 2 through the bubble membrane 3, and microscopic bubbles 4 are sandwiched between the giant medium air bubbles 2.

The bubble film 3 on the surface of the foamed polyolefin resin plate 1 projects in a spherical shape, and unevenness is formed between the valleys where the giant medium bubbles 2 contact each other.

The foamed polyolefin resin plate 1 of the present invention has the above structure and has a thickness of 3 to 50 mm.

If the thickness is less than 3 Trrfn, it is difficult to arrange the giant medium air bubbles 2 in a plate-like shape.

In addition, the foamed polyolefin resin plate-like body 1 of the present invention has two
It has an expansion ratio of 0 to 8@ and has an extremely low specific gravity.

In the present invention, the cells of the foamed polyolefin resin plate 1 are extremely large and spherical compared to the cells of conventional foams, and the cell membrane 3 can be seen directly with the naked eye.
has extremely strong transparency.

Reference photo 1 is an enlarged photo of the surface of the foamed polyolefin resin plate having giant internal air bubbles according to the present invention, and reference photo 2 is an enlarged photo of the side surface.

The foamed polyolefin resin plate 1 of the present invention has the following characteristics compared to a foamed polyolefin resin sheet having microcells:
It is so-called strong and self-supporting, and can also be used as the side wall of a container.

Furthermore, since the bubble film is formed to be extremely thin, that is, 0.1 mm or less, it has good shock absorption properties and good shape retention.

It is extremely suitable as a buffering material or cushioning material when packaging heavy items.

Moreover, compared to polystyrene foam, it has higher bending strength and warmer properties.
Since it has excellent resilience against pressure, it will not break and can be widely used as various cushioning materials and packaging materials.

Conventionally, sheet-like or plate-like airbags in which air is completely sealed in a cylindrical shape between two polyethylene films have been widely used as various packaging cushioning materials or heat insulating materials. Although it requires equipment and is therefore expensive, the foamed polyolefin resin plate 1 of the present invention uses a known cell regulator in a smaller amount than conventionally used (conventionally, about 10 parts per 10 parts of polyolefin). 1 part by weight), it can be easily manufactured by extrusion foaming with a normal extruder, so it can be obtained extremely economically, has excellent cushioning properties, good restoring force, and has a foaming ratio higher than that of airbags. Since it can be made high, it is lightweight and can be widely used as a cushioning material and other purposes.

Example 1 A foam was obtained according to the following formulation.

Ingredients Polyolefin (polyethylene) Foam regulator (talc) Higher fatty acid ester (sorbitan monostearate) 1.0-2.0 Extrude polyethylene powder and talc into a hopper (200℃)
), 15 parts by weight of a blowing agent (butane) was mixed into the extruder, and then sorbitan monostearate was mixed and mixed thoroughly, and then extruded from the tip of the extruder (110°C).

[Brief explanation of the drawing]

The drawings illustrate a foamed polyolefin resin plate having large internal air cells according to the present invention, in which FIG. 1 is a perspective view and FIG. 2 is a cross-sectional view. The main symbols in the drawings are as follows. 1... Foamed polyolefin resin plate, 2.
...Giant medium air bubbles, 3-cell membrane, 4...micro bubbles. Weight part 00 0.3

Claims (2)

[Scope of utility model registration request] (1) A foamed polyolefin resin extruded plate-like body having a thickness of 3 to 50,771,771 mm, in which giant medium-sized air bubbles consisting of nearly spherical closed cells having a cell diameter of 2rIrIrL or more and 101rrIrL or less are present throughout the foamed plate-like body. occupies 60% or more of the foam, the thickness of the cell membrane is 0.1 m or less, the cell membrane of the epidermis is exposed to form an uneven pattern on the surface, and it has a foaming ratio of 30 to 8@. A foamed polyolefin resin extruded plate-like body having giant air bubbles. (2) A foamed polyolefin resin plate having giant hollow air cells according to claim 1, wherein the polyolefin resin is polyethylene or polypropylene.