JP3062453B2 - Truck carrier cover sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cover sheet for covering a load loaded on an open carrier of a truck.

[0002]

2. Description of the Related Art Heretofore, a cover sheet has been used to prevent a load loaded on a truck bed from falling down and to protect the load in bad weather such as rainy weather. Examples of such a cover sheet include a tarpaulin sheet in which a woven or knitted fabric made of nylon or polyester multifilament is coated with a vinyl chloride resin, and a laminate sheet in which a film layer is formed on a woven or knitted fabric made of polyolefin flat yarn. There is a tarpaulin. However, although the conventional cover sheet has a waterproof function, its heat shielding function is insufficient, so the quality is likely to change when exposed to high temperatures such as fresh foods such as vegetables, fruits and fish, and other foods and liquors. It is considered unsuitable for baggage transport.
Therefore, a cover sheet in which aluminum foil or an aluminum vapor-deposited film is laminated has been proposed for the purpose of improving the heat shielding property. However, since the cover sheet is relatively rough-handed, the cover sheet is easily damaged, and the metal layer is corroded. However, it is not satisfactory in terms of the heat shielding effect.

[0003]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has various characteristics such as waterproofness, high strength, durability and light weight that a cover sheet for covering a truck bed should originally have. In addition to the above, an object of the present invention is to provide a truck carrier cover sheet that imparts excellent heat shielding properties and can be easily and inexpensively manufactured.

[0004]

The present invention SUMMARY OF] includes a base substrate made of synthetic fiber yarn, a high synthetic resin long fiber filaments whiteness is being deposited bonded to high density and non-oriented
The gist of the present invention is a cover sheet for a truck carrier, which is constituted by a laminate in which a non-woven fabric having an infrared reflectance of 85% or more is laminated with an adhesive layer.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The base material used for the truck carrier cover sheet of the present invention is the main component of the physical strength of the cover sheet, and is made of woven fabric, knitted fabric, felt made of synthetic fiber yarn. It is a sheet-like material such as ground.

Here, the synthetic fiber yarn is a polyolefin, polyester, polyamide, polystyrene,
It is spun from polyvinyl chloride resin, etc., and its fiber form is flat yarn, which is obtained by slitting and stretching a film, split yarn, which splits flat yarn,
Monofilaments such as monofilaments obtained by stretching filaments extruded from a circular or irregular cross-section nozzle, and multifilaments obtained by converging low fineness monofilaments, and composite yarns such as multi-filaments, multi-filaments, core-sheath types, and parallel types are employed without limitation.

[0007] The base material composed of the synthetic fiber yarn is not limited in its form and texture. For example, in the case of a woven fabric, a twill weave, a tangle weave,
For knitted fabrics such as woven fabrics, Russell knitting, tricot knitting, and Miranies knitting, and for felt fabrics, needle punch method, thermal bond method, resin bond method, etc. There may be.

Although the base material used in the present invention which can be used in various combinations as described above, it is inexpensive, has good productivity, and is functional. As the base material, a fineness of 300 molded from a polyolefin resin such as high-density polyethylene or polypropylene can be used.
Using flat yarn of ~ 3,000dr, 6 as warp
Most preferred is a flat yarn cloth obtained by driving at a density of ~ 30 yarns / inch.

The base material represented by the polyolefin-based flat yarn cloth has a tensile strength of 50 kgf / 50 m so as to withstand the use conditions of the truck carrier cover sheet.
m, the tear strength is preferably 10 kgf or more.

Next, the non-woven fabric to be bonded to the base substrate is used for imparting heat shielding property to the cover sheet, and is formed by a direct spinning method in which spinning, drawing, opening, and bonding steps are continuously performed. It is obtained by randomly depositing and bonding long fibers. Specifically, a spunbond in which a spinnable polyolefin-based, polyester-based, or polyamide-based synthetic resin is put into an extruder to be in a molten state, and a fiber extruded from a spinning nozzle is drawn into a drawn fiber by a roller method or an air jet method. Non-woven fabric by melt method, non-woven fabric by melt blow method in which molten resin is injected from spinning nozzle together with high-pressure gas flow into spinning fiber, or solution in which spinnable synthetic resin is dissolved in solvent at high temperature and high pressure through air spinning nozzle Non-woven fabrics produced by the flash spinning method, in which the solvent is vaporized to form a fiber by evaporating the solvent, are exemplified.However, the non-woven fabrics produced by the flash spinning method are particularly preferable because they have high strength, are easy to handle, and have excellent heat shielding effects. is there.

In the flash spinning method, a solution obtained by dissolving a synthetic resin such as high-density polyethylene or polypropylene in a solvent having a low boiling point such as a halogenated hydrocarbon, an aromatic hydrocarbon, or an aliphatic hydrocarbon under high temperature and high pressure is used. It is released into the atmosphere at low temperature and low pressure through a spinning nozzle equipped with a pressure drop chamber in a more pressurized state, and the solvent evaporates instantaneously, giving the fiber orientation by its expansion force. An ultrafine and high-strength fiber having a single-fiber fineness of about 0.1 to 0.3 dr is formed, and the nonwoven fabric obtained by depositing the fibers while intersecting and thermocompression bonding has a dense structure bonded at high density.

The nonwoven fabric obtained in this manner is opaque and has a high degree of whitening because long fibers are deposited and bonded at a high density. However, as a material constituting the truck carrier cover sheet, Those having spectral characteristics with respect to infrared rays satisfying the following numerical values are preferable. Infrared reflectance 85-93% Infrared absorption 2-0% Infrared transmittance 13-7%

That is, the non-woven fabric has an infrared reflectance of 85%.
With the above high, the surface of the cover sheet reflects infrared rays that cause a temperature rise in the solar energy, and the temperature rise of the load on the truck bed covered with the cover sheet can be reduced. Is as low as 2% or less, the nonwoven fabric itself does not absorb solar energy and stores heat, and has an excellent heat-preventing effect. In addition, since the heat insulation effect is good, when used in a cold region in winter, the heat energy of the laminate is retained without being transmitted, so that it also has a cold protection effect.

In the present invention, an integrated laminate is formed between the base substrate and the nonwoven fabric via an adhesive layer. The adhesive layer to be bonded is preferably made of a synthetic resin of the same type or the same type as the two members in order to firmly bond the two members, and further has a polar group-containing polyolefin-based material having an excellent function of bonding different kinds of synthetic resins. Resins and the like are preferably used. As a specific example of the adhesive layer,
Ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, ethylene-ethyl methacrylate copolymer, low-density polyethylene, linear low-density polyethylene, ethylene-propylene copolymer, maleic anhydride-modified low Density polyethylene and the like.

As a method for providing the adhesive layer, a known laminating method such as an extrusion laminating method, a dry laminating method, and a thermocompression laminating method can be employed. However, the extruding laminating method is preferable as a method capable of processing at high speed stably.

The basic configuration of such a laminate is shown in FIG.
Since it uses the heat shielding property of the nonwoven fabric, the front and back surfaces are distinguished from the surface layer for the purpose of heat protection to the nonwoven fabric / adhesive layer / base substrate, and vice versa for the purpose of cold protection. . In addition, as a basic structure, a synthetic resin film layer is provided on the front side (FIG. 2b) or the back side (FIG. 2c) or the front side (FIG. 2c) of the laminate to improve abrasion resistance and impart antifouling property and smoothness as necessary. It may be provided on the back side (FIG. 2d).

The truck carrier cover sheet of the present invention comprises:
After cutting the above-mentioned laminated body to a predetermined size corresponding to the size of the truck bed, bend the peripheral edge or wind a reinforcing tape and apply edge processing by heat bonding or stitching. Products are arranged at intervals.

[0018]

【Example】

Example 1 As the nonwoven fabric 3, a nonwoven fabric having a basis weight of 60 g / m ² produced by fiberizing high-density polyethylene by flash spinning was prepared. On the other hand, high density polyethylene (MFR = 1.0g / 10mi
n., density = 0.956 g / cm ³ ) was fed into an extruder to form a film by an inflation method, and after slitting, stretching was performed at a stretching ratio of 5 to produce a flat yarn having a fineness of 900 dr. A woven fabric woven in a plain weave structure at a driving density of 17 × 17 yarns / inch by a Sulzer-type loom using the flat yarns as warp yarns was used as the base substrate 2. Between the nonwoven fabric 3 and the base material 2, an ethylene-vinyl acetate copolymer (MFR =
8.0 g / 10 min., VA content = 5% by weight) to form an adhesive layer 4 by extrusion lamination, and a synthetic resin film layer 5 also made of an ethylene-vinyl acetate copolymer on the back surface of the base material. A laminate 1 having a configuration as shown in FIG.
I got The tensile strength of the laminate 1 was 112 kgf / 5 cm, the tensile elongation was 19.8%, and the tear strength was 18.5 kgf. The thus obtained laminated body 1 is cut into a size of 2.3 × 3.5 m, and the peripheral portion is bent and thermally bonded to perform edge processing, and eyelets are punched into the edge processed portion at intervals of about 40 cm. Created a truck carrier cover sheet.

Example 2 As a nonwoven fabric, a nonwoven fabric having a basis weight of 60 g / m ² composed of a polyester core and a polyethylene long fiber sheath was used by a spun bond method. Created.

Comparative Example 1 A cover sheet for a truck carrier was prepared in the same manner as in Example 1 except that a white stretched polyethylene film having a thickness of 50 μm was used instead of the nonwoven fabric.

COMPARATIVE EXAMPLE 2 Instead of a nonwoven fabric, an aluminum vapor-deposited film having a structure in which an aluminum vapor-deposited layer was adhered to the surface of a stretched polyethylene film having a thickness of 40 μm and the vapor-deposited layer was protected with polyethylene having a thickness of 20 μm was used. A cover sheet for a truck bed was prepared in the same manner as described above.

Evaluation Using the truck carrier cover sheets of the examples and comparative examples, the truck carrier was fixed with rubber bands while actually covering the carrier, and the temperature inside the carrier was measured and summarized in Table 1 together with the outside air temperature. Shown.

[0023]

[Table 1]

[0024]

As described above, the truck carrier cover sheet of the present invention comprises a base substrate made of synthetic fiber yarn,
The structure is made by bonding long-fiber non-woven fabric as a heat shield material by flash spinning, etc., which has high infrared reflectance and low infrared absorptivity, so it is affected by the temperature of fresh foods, foods, alcohol, etc. loaded on the truck bed Accordingly, the sheet can be suitably used as a protection sheet for a load which is easily deteriorated.

[Brief description of the drawings]

FIG. 1 is a partially broken plan view showing a laminated body serving as a truck carrier cover sheet of the present embodiment.

FIG. 2 is a schematic partial cross-sectional view showing a laminate serving as a truck carrier cover sheet of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Laminated body 2 Base base material 3 Nonwoven fabric 4 Adhesive layer 5 Synthetic resin film layer

Claims (1)

(57) [Claims] 1. A nonwoven fabric having an infrared reflectance of 85% or more, wherein a base material made of a synthetic fiber thread and a synthetic resin long fiber filament having high whiteness are deposited and bonded in a non-directional manner at a high density. Characterized in that the cover sheet is composed of a laminated body obtained by laminating the above with an adhesive layer.