JPH02266922A - Net like sponge sheet - Google Patents

Abstract

PURPOSE:To use the title sheet in a packing material or an underlay as a cushion material by coating all of knitting yarns with a foamed resin so as not to close large stitch intestices but to close small stitch interstices and forming foamed projections on said small stitch interstices. CONSTITUTION:A foamable resin composition is applied to the entire surface of a warp knitting net used as a core material using a spray coater or a roll coater and foamed. At this time, the foamable resin composition is difficult to accumulate in large stitch interstices 11 to remain as interstices as it is but easy to accumulate in small stitch interstices 12 to be applied herein in large quantities to close the stitch interstices 12 and foamed to form large foamed projections 14. As a result, a net like sponge sheet 15 wherein the large stitch interstices 11 become opening parts 16 and are surrounded by the foamed projections 14 is obtained. Knitting yarns 13 are interposed in the foamed projections 14 connecting the opening parts 16 as a core material and the projections 14 reinforced by said knitting yarns 13 are reinforced by the foamed resin to connect respective braid like chain stitches 17 extending to a wale direction and, therefore, this sheet is not extended and shrunk even at high temp. and is hard to rupture even when the surface thereof is rubbed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a sponge sheet used as a cushioning material for packaging materials, underlay A, etc.

[Conventional technology]

In the sponge sheet, air bubbles are formed individually like hollow balls, and air bubbles are connected to form an enclosed cavity. There are open-cell foams that have ventilation and M-filling properties, and they are made of resins and rubbers such as polyurethane resin and polyvinyl chloride resin.

To use these sponge sheets like a filter to screen out fine dust, you can drill holes all over the single-cell type, or use the open-cell type as is.

[Problem that the invention seeks to solve]

However, the internal voids of the open-cell sponge sheet are too dense and dust can get inside. III.It gets dirty easily, and even if you try to make a cushioning net by making large holes in these sponge sheets, if you make the intervals between the holes small or increase the hole diameter, the whole will stretch easily and break easily. Therefore, it is not possible to create a net with cushioning properties.

[Object of the Invention] The present invention provides a cushion f? that can wash off dust attached to vegetables and fruits while still being packaged. ) To provide a strong net-like sponge sheet that is difficult to stretch and break, suitable for use in packaging nets with 300 degrees Celsius and cushioning underlays in which dust does not collect on the back surface and is difficult to accumulate on the surface.

[Structure of the invention]

The sponge sheet 15 according to the present invention is composed of an interlining of adjacent meridian nets with stitch gaps 1 m −12 of different sizes, and the foamed resin crushes all the knitting yarns 13 without blocking the large stitch gaps 11. ■Small stitch gap 12
It is characterized by forming foamed ridges 14 in the small mesh gaps 12 to be closed, for example, by applying a foamed resin composition to the meridian net and foaming it. You can make it.

Specifically speaking, the manufacturing method is such that a foamed resin composition is applied to the entire surface of a meridian net serving as an interlining using a spray coater, a roll coater, etc., and then foamed.

At that time, the foamed resin composition is difficult to accumulate in the large stitch gaps 11 (it remains as a gap, but the foamed resin composition tends to accumulate in the small stitch gaps 12, so a large amount is applied there to close the stitch gaps 12, The foamed resin composition foams to form large 9. foam ridges 14.

In this way, the large stitch gaps 11 become openings 16, and a neat net-like striped sheet 15 with foamed ridges 14 surrounding the periphery is obtained.

Therefore, as an interlining material, it is preferable to use a meridian net which has a large difference in the size of the stitch gaps 11 forming the openings 16 and the stitch gaps 12 forming the foamed raised stitches. The viscosity of the foamed resin composition is adjusted according to the difference in size and applied.

In that case, the size of the stitch gaps 11 and 12 should be set based on the size of the inscribed circle that is in contact with the knitting yarn 13 that shapes the periphery of those gaps.For example, as a raw material for conventional sponge sheets, When using a vinyl chloride-based resin blended with a commonly used pyrolytic foaming agent, the diameter ii'j of the inscribed circle of the large stitch gap 11 is set as D,
When the inscribed circle and diameter of the small stitch gap 12 are D',
Between them D>1.5D', D>3 (ms)
, D< 5 (am).

The large stitch gap l) is surrounded by only the small stitch gap 12 as shown in FIG. 1, or by the small stitch gap 12 and the chain stitch 17 as shown in FIG. shall be. the! In the case of &, the length (l,) of the thread 407 forming part of the periphery of the large stitch gap 11 is 5 mm or less, preferably as short as about 2 to 3 Ia.

The foamed resin composition may be one in which a pyrolyzable foaming agent is blended and then mechanically foamed using a mixer or the like.

If you want to increase the solid content ratio of the foamed resin composition or increase the density of the foamed resin composition, or if you want to make the foamed resin composition highly viscous, it is necessary to introduce an air flow to the applied surface of the foamed resin composition applied to the meridian net. Apply IR motion to the entire meridian network! The coating film that closes the large gap 11 is destroyed by touching the surface.

The net-like Sponge Sea I.15 can be colored by applying paint to the entire surface, or printed with designs, etc., or finished by performing necessary surface cosmetic treatments such as electrostatic flocking. .

[Young fruit of invention]

The sponge sheet 15 according to the present invention appears to be a perforated sponge sheet in which a large number of holes are formed close to each other in a foamed resin sheet, but the periphery of each opening 16 is formed by the knitting threads 13. surrounded by each opening 1 by its knitting yarn 13
A knitting yarn 13 is interposed as a core material inside the foamed protuberance 14 that connects each of the openings 16, and a protrusion 14 reinforced by the knitting yarn 13 forms a partition between the openings 16. Each braided chain A11 is reinforced with foam resin and extends in the wale direction.
Since 7 are connected, it does not easily expand and contract even at high temperatures, and the surface is rubbed and ζ is difficult to tear, making it excellent in strength and stable in shape.

On the other hand, the warp net that serves as the interlining is foldable and deformable, and the foamed resin that reinforces the knitting yarn 13 and chain stitch 17 is also a flexible elastic body, so they form a body and mutually reinforce each other. Even if they overlap, the inherent flexibility of the knitted net and the foamed resin is hardly impaired.

Therefore, according to the present invention, it is rich in flexibility and stiffness,
A net-like perforated sponge sheet H5 is obtained which is stable in shape, difficult to expand and contract, has excellent strength, and is convenient for packaging materials and underlay materials.

In addition, the net-like sponge sheet 15 according to the present invention includes:
After applying the necessary surface cosmetic treatment, we can create blinds (mouth guards), curtains, etc.
It can also be used as table cloths, rugs, wall coverings, vehicle interior materials such as trunk seats, chairs, and seat covers, linings and underlay cushioning materials, non-slip underlays for ornaments, etc. It can also be used as a substitute for wire mesh by using thermosetting resin such as melamine, metal vapor deposition treatment, etc., and these embodiments do not limit or extend the technical scope of the present invention. Does not decrease by 1.

[Brief explanation of drawings]

1 and 2 are perspective views of a net-like sponge sheet according to the present invention, with a portion of the foamed resin cut away. 15...Sponge Sea 1-116...Opening, 17
...chain stitch.

Claims (1)

[Claims] The interlining is a meridian net with adjacent stitch gaps 11 and 12 of different sizes, and the foamed resin
1, covering all the knitting yarns 13 and closing small stitch gaps 12, and forming foam ridges 14 on the small stitch gaps 12 to be closed. sponge sheet.