JPH04185776A - Moisture condensation-proof sheet and fuse-bonded moisture condensation-proof sheet - Google Patents

Abstract

PURPOSE:To obtain a sheet thermofusible throughout the surface with no use of any highly water-absorbable resin inducing the drop of said sheet's mechanical strength by laminating one or both of the surfaces of a waterproofed cloth with thermofusible nonwoven fabric (s). CONSTITUTION:One or both of the surfaces of a waterproofed cloth 1 is (are) laminated with thermofusible nonwoven fabric (s), e.g. nonwoven fabric (s) 2 containing >=30wt.% of polyvinyl chloride fiber and the laminated cloth is seven bondendly via said nonwoven fabric (s), by high-frequency welder, thus obtaining the objective sheet with high peel strength at the joint (s) where water intrusion is prevented, thereby freed from the drawbacks involved in conventional waterproof sheets.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a truck seat, a truck hood, an open sheet,
The present invention relates to a condensation prevention sheet that can be heat-sealed by laminating a heat-sealable nonwoven fabric to a waterproof fabric used for tent warehouses, partition sheets, etc., and a heat-sealed and heat-sealed anti-condensation sheet.

[Conventional technology]

Conventionally, to prevent condensation on such waterproof fabrics, super absorbent resins are mixed into various resins and applied to the base fabric or waterproof fabric to absorb condensation water and prevent dripping. . Furthermore, Japanese Utility Model Application No. 63-158997 discloses a structure in which dew condensation water is absorbed between the fibers of a nonwoven fabric.

However, in both configurations, the dew condensation prevention layer lacks thermal adhesion or provides insufficient bonding strength, so either the dew condensation prevention layer is not provided in advance at the joint, or the dew condensation prevention layer is removed at the time of bonding. A time-consuming method such as bonding is used.

[Problems to be solved by the present invention]

In conventional methods using superabsorbent resins, the higher the water absorbency of the resin, the more the adhesive strength at the joint tends to decrease or peel off during use due to water absorption and swelling of the resin. Also,
The superabsorbent resin layer other than the joints also had the disadvantage of being weak against friction when water was absorbed. In addition, even in the method using nonwoven fabric, it is necessary to make the joint part without nonwoven fabric, and when joining together with nonwoven fabric, it is necessary to perform sewing with a sewing machine and to blind the holes of the sewing machine needle, which is time-consuming. Furthermore, Utsukai 63-1589
No. 97 discloses a dew condensation prevention sheet having a structure in which a nonwoven fabric is bonded and integrated on only one side of a waterproof fabric, and the method of integration involves mixing heat-sealing threads into the constituent threads of the nonwoven fabric. Suggested. However, when joining these anti-condensation sheets, there is a problem in that the waterproof sheets must be directly welded to each other without attaching a nonwoven fabric to the welded portion.

The present invention provides a full-surface heat-sealable dew condensation prevention sheet constructed by laminating a heat-sealable nonwoven fabric on one or both sides of a waterproof fabric, and a heat-sealable nonwoven fabric laminated on one or both sides of a waterproof fabric. The purpose of the present invention is to provide a dew condensation prevention sheet that is heat-sealed and bonded through a nonwoven fabric.

[Means to solve the problem]

In order to achieve the above object, the present invention does not use a super absorbent resin that causes a decrease in joint strength, but instead uses heat-meltable nonwoven fabric, which has high peel strength at the joint and is water resistant even when melted. By selecting a nonwoven fabric that does not seep in, and bonding this to a waterproof fabric, we have found a dew condensation prevention sheet that can be welded by high frequency welding during sewing, and have arrived at the present invention.

The heat-sealable nonwoven fabric used in the present invention has sufficient peel strength when heat-sealable fibers are thermally bonded to its constituent fibers, and is capable of preventing water from entering from the joint. Contain a sufficient amount. There are no restrictions on the type and amount of fibers to be used in combination with fibers other than heat-fusible fibers as long as the above conditions are satisfied. The most preferable example of the heat-fusible fiber is polyvinyl chloride fiber, and the mixing ratio thereof is preferably 30% or more. If it is less than 30%, the peel strength of the bonded portion may be insufficient or the prevention of water leakage from the fused portion may be insufficient.

The thickness and weight of the heat-meltable nonwoven fabric can be arbitrarily selected within the range that satisfies the above bonding conditions, but usually 30
~300g/rrf basis weight is suitable; 30g
If it is less than /rrr, the water retention capacity of condensed water is insufficient and the insulation effect for reducing the amount of dew condensation is also poor, making it impossible to achieve the object of the present invention. In addition, if it is more than 300g/rrr, the insulation effect and water retention effect are sufficient, but the weight of the entire sheet and the thickness of the joint part are both excessive, which is disadvantageous in practice, so it is not preferable, and if it is more than 300g/nf, insulation effect,
Although the water retention effect is sufficient, both the mass of the entire sheet and the thickness of the joint portion become excessive, which is not preferred in practice.

[Effect]

In the dew condensation prevention sheet of the present invention configured as described above,
Since the waterproof fabric is laminated with heat-sealable non-woven fabric, the temperature gradient inside and outside the sheet is gentler, reducing the amount of condensation, and even if condensation does occur, it can retain a large amount of condensed water, which solves the conventional problems. It works to easily prevent water droplets from falling inside the hood.

Furthermore, in the heat-sealing sewing of the dew condensation prevention sheet, super absorbent resin, which causes a decrease in strength at the joint, is not used, and a nonwoven fabric that is heat-meltable and has high peel strength at the joint is melt-sealed. Since the structure uses a non-woven fabric that prevents water from entering even when the sheet is wet, it is possible to sew the entire sheet together using a high-frequency welder, and there is no need for any special treatment at the joint. It also works to solve the problems of conventional products in terms of strength and water resistance.

[Examples] Hereinafter, the present invention will be specifically explained using Examples and Comparative Examples.

1 to 5 are sectional views of essential parts showing the structure of the dew condensation prevention sheet of the present invention. In the figures, 1 is a waterproof fabric, 2 is a heat-sealable nonwoven fabric, and 3 is a high-frequency welder joint. FIG. 2 shows the sheet shown in FIG. 1 in a welded state. Fig. 3 shows a waterproof fabric with heat-sealable nonwoven fabric laminated on both sides, and Fig. 4 shows the welded state. Furthermore, FIG. 5 shows a state in which the dew condensation prevention sheet shown in FIG. 3 and the ordinary waterproof fabric 1 are fused together. In this case, non-woven
Since the fabric layer is double, the insulation effect is further improved.

Example 1 A non-woven fabric with a fabric weight of 100 g/n (0.8 mm thick) consisting of 50% polyvinyl chloride fiber and 50% acrylic fiber was impregnated with a polyester short fiber high-density woven fabric with polyvinyl chloride resin. Fabric weight: 575 g/bo, thickness: 0.
The dew condensation prevention sheet of the present invention was prepared by laminating the sheet to 67 Kaku's waterproof cloth (No. 4 canvas) using an adhesive.

For comparison with this sheet, a sheet without a nonwoven fabric (blank) and a sheet (A) coated with a superabsorbent polymer instead of the nonwoven fabric were prepared and a comparative test was conducted.

Test method> The method for evaluating the dew condensation prevention performance will be explained with reference to FIG. 350 cc of cold water at 4° C. is placed in a glass bottle 4, and a sample 5 of 10 CI + square is fixed around it with double-sided tape with the nonwoven fabric facing outside. Furthermore, this was covered with a bell-shaped glass container 5, and air humidified by an ultrasonic humidifier, Toshiba KA509 model 6, was sent in from the bottom of the container to examine the state of dew condensation. The temperature of the air in the laboratory at this time was 28°C2
Relative humidity was 40%. The test results are shown in Table 1.

As shown in Table 1 in the margin below, in the case of the blank and comparative example A, water droplets began to fall by 25 minutes and 60 minutes from the start of the experiment, respectively, but with the product of the present invention, water droplets remained on the surface even after 60 minutes. unacceptable.

Example 2 The anti-condensation sheet of Example 1 has a height of 20ai and a width of 15C.
Two 1 m sheets were made, one polyvinyl chloride surface and the other non-woven surface were combined, and three peripheral directions were joined using a high frequency welder with a width of ICI to form a bag. This bag was filled with water up to 15 CI from the bottom and left for a day and night, but no water leakage from the joints was observed.

After this experiment, the peel strength of the joint was measured and the result was 1.6.
kg/ci+, and no difference was observed between the peel strength and the dry peel strength.

[Effects of the Invention] According to the present invention, by laminating a heat-sealable nonwoven fabric to a waterproof fabric, condensation can be reduced, and the condensed water can be absorbed and retained in the nonwoven fabric layer to prevent water droplets from forming and dripping. In addition to preventing this, it is possible to sew joints over the entire surface of the seat using a high-frequency welder, eliminating the need for special treatment of joints, making it extremely easy to sew trunk seats, truck tops, open-air seats, tent warehouses, partition sheets, etc. In addition, the strength and water resistance of the sewn parts have completely resolved the problems of conventional products.

[Brief explanation of drawings]

1 and 5 are sectional views of the main parts of the dew condensation prevention sheet according to the present invention, and FIGS. 2 and 4 are sectional views of the main parts showing the state in which two sheets of each sheet are heat-sealed and bonded. It is. FIG. 5 is a sectional view of a main part of an example in which the dew condensation prevention sheet of FIG. 3 is heat-sealed and bonded to an ordinary waterproof cloth. FIG. 6 is an explanatory diagram of a test device for evaluating the dew condensation prevention performance of the dew condensation prevention sheet. 1... Waterproof fabric, 2... Heat-sealable nonwoven fabric, 3
...High frequency welder joint, 4...Glass bottle, 5
... Sample, 6... Bell-shaped glass container, 7... Ultrasonic humidifier Fig. 4 Fig. 5

Claims (3)

[Claims] (1) A full-surface heat-sealable anti-condensation sheet made by laminating a heat-sealable nonwoven fabric on one or both sides of a waterproof fabric. (2) The anti-condensation sheet according to claim 1, wherein the nonwoven fabric contains 30% by weight or more of polyvinyl chloride fibers. (3) A condensation prevention sheet that is heat-sealed and bonded to one or both sides of a waterproof fabric via a heat-sealable nonwoven fabric.