CN1169943A

CN1169943A - Packing method of using ventilatable film inseries products of warming bag lining

Info

Publication number: CN1169943A
Application number: CN 96106772
Authority: CN
Inventors: 王玉民
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-07-08
Filing date: 1996-07-08
Publication date: 1998-01-14
Anticipated expiration: 2016-07-08
Also published as: CN1061940C

Abstract

A method using air-permeable porous film as packing material of internal bag of warming bag products which is used to warm hand, foot or human body by durable and stable heat generated by oxidation reaction of iron powder as main raw material on oxygen reaction to generate stable heat and no pollution to clothes and body.

Description

Microporous breathable film is used for the method for series products of warming bags inner bag packing.

The present invention relates to a kind ofly utilize microporous breathable film to be compounded on other base materials and as the method for the packing inside bag of series products of warming bags.This film have high pore-solids ratio (30-60%) aperture little (less than 1 micron) gas-premeable strong (50-200 milliliter/sq m. second. barometric pressure) all even excellent mechanical property of pore size distribution.See Fig. 1

Series products of warming bags (comprises warm hand now, warm pin, warm body applications etc.) hereinafter to be referred as warm bag, employed inner bag packing are even for (to comprise the paper fiber base material on various base materials, nonwoven polypropylene fabric, nylon nonwoven fabrics, polyester non-woven fabric vegetable fibre woven and chemical ﹠ blended fabric) laminating polyethylene film (complex method have hydrostomia compound and to do wet method compound) and the interior bag material that obtains, this method can not be directly used in warm bag product, need to process through acanthopore, the pore size of acanthopore and quantity, because of being machine up, be difficult to obtain the on all four interior bag material of Air permenbility.Make that warm bag heat-producing heat of product and time length can't be in full accord.

In addition because of the warmer bag adstante febre in acanthopore processing aperture, because the heat motion hydrone of molecule evaporates and runs off rapidly from the hole, make the iron powder in the reactant not react completely, promptly lost heat-producing condition because of losing reaction medium, for addressing this problem, prolong fever time, be to strengthen the weight of warm bag reaction mass or the humidity of augmenting response material always, thereby caused the waste of material, and the initial reaction stage temperature rises more casual, reaction temperature in mid-term is crossed high drawback, sees Fig. 2, owing to adopt mechanical acanthopore, because of the aperture big＞0.2MM thereby (iron powder accounts for 10-20% less than 100 purposes in the material when warm bag exothermic reaction finishes, active carbon all accounts for the 3-4% and the reacted brown iron oxide of material less than 100 orders) reactant this moment drying, and granularity is little, thereby easily oozes out and pollution clothes and health from the hole of being stung.

The present invention is applied to warm bag product with microporous breathable film to replace the interior compound polyethylene foil of bag material, the production technology of this film is similar to the processing technology of domestic patent CN1017682B, adopt the way that in macromolecule resin, adds nucleating agent in proportion when being moulding, after making film generation crystal transfer cause occurring micro-interface or slit to form the film of a large amount of pore characteristics by unidirectional or biaxial tension, hydrostomia or warp are done the wet method composite methods again, are compounded in to make warm inner bag material need not just can obtain gas through mechanical acanthopore again on the base material, the purpose that the liquid infiltration is passed through.

The method that the present invention adopts has that pore size distribution is even, the aperture good advantage of little permeability makes the performance of warm bag product obtain very big change.Because the aperture makes warm bag not pack (Fig. 3) because of evaporating direct outflow inner bag at oxidation adstante febre hydrone for a short time, and in inner loop, iron powder is fully reacted completely, the degree of utilization that has improved material has prolonged the heat-producing time, thereby in the prescription of the single bag of weight that can reduce reaction mass relatively material when reaching the purpose of saving in material, can reduce the consumption of water, reduce humidity, make warm bag when initial reaction, heat rises very fast, and has improved the programming rate of warm bag.The micropore of even in addition cloth is unlikely too high scalded skin because of its oxygen permeating amount evenly can make the temperature of warm bag when the reaction, and reaction finishes the back because of the granularity of micropore size less than the material dust, thereby does not have dust and leak into outer package and pollution clothes and health.

Embodiment

Example 1

Adopt original interior bag material (getting through acanthopore processing), size 130mm * 95mm packs for warm bag, and reaction mass net weight 60 grams its every index behind special-purpose thermometric case build-in test is respectively: (25 ℃ of ambient temperatures)

Required time was 9 minutes and 20 seconds when intensification reached 40 ℃

Maximum temperature is 72 ℃

Duration of the reaction is 20 hours

Its temperature of reaction curve is seen Fig. 4

Example 2

Adopting micro-porous permeable fenestra average diameter is 100 milliliters/sq m less than 1 micron Air permenbility. second. other conditions of bag material are with example 1 in atmospheric

Required time was 8 minutes and 30 seconds when intensification reached 40 ℃

Maximum temperature is 70 ℃

Duration of the reaction is 25 hours

Its response curve is seen Fig. 5

Description of drawings

Fig. 1 is the flying-spot microscope photo of microporous breathable film

The interior cycle diagram of water vapour when Fig. 2 is the distribution graph of warm inner bag material mechanical acanthopore of former employing and material reaction

The interior cycle diagram of water vapour during material reaction when Fig. 3 is interior bag material for adopting microporous barrier

Fig. 4 is the material temperature curve when adopting original interior bag material through perverse hole

Fig. 5 is a material temperature curve when adopting microporous breathable film

Claims

1, in the interior bag material that with the iron powder is the primary raw material series products of warming bags that utilizes oxidation exothermic reaction principle, uses the method for microporous breathable film;

2, according to claim 1, microporous breathable film comprises polyethylene, the unidirectional or biaxial tension of polypropylene or ethene one propylene-based block copolymer footpath specially-shaped technology and the pore-solids ratio 30-60% Air permenbility that obtains is 50-200 milliliter/sq m. second. atmospheric film.This film has excellent mechanical property and air-and water-permeable performance.The aperture is less than 1 micron.

3, according to claim 1, series products of warming bags comprises multi-purpose series of products such as warm hand, warm pin, warm health.

4, according to claim 1, warm inner bag packing, its base material comprises paper substrate, nonwoven polypropylene fabric, nylon nonwoven fabrics, polyester non-woven fabric, vegetable fibre woven, chemical ﹠ blended fabric etc., with the compound microporous breathable film of above-mentioned base material, complex method comprises hydrostomia, do the wet method inner bag packing that obtained such as compound.