CN1051564C - Decompositable material for package and method for producing food container - Google Patents

Abstract

The present invention relates to a biodegradable material for package, which comprises the components of the proportion: 100 of starch, 50 to 70 of water, 1 to 7 of cellulose, 6 to 18 o f water soluble resin, 2 to 6 of hygroscopic agent, 0.5 to 2 of stabilizing agent, 0.5 to 2 of lubricating agent, 0.3 to 2 of foaming agent and 0.3 to 2 of foaming promoting agent. In addition, 0 to 0.1 of antioxidant, 0 to 1 of antimildew agent, 0 to 5 of brightening agent and 0 to 1 of coupling agent can be also added to the components. Food containers in various shapes, such as cups, dishes, bowls, boxes, etc. can be produced by an extruding moulding technology or an injection moulding technology and have the advantages of mildew prevention, sufficient leakage preventing capability, easy degradation and no pollution. Thus, the container can completely replace plastic packing containers as well as can be used as fodder or organic fertilizer by recovery.

Description

The method of packaging biodegradable material and manufacturing food container

The present invention relates to be used for the biodegradable material of object or material package and utilize this material to make the method for food container.

The disposable food packing container that uses is measured by fast food, fast food sparetime university at present, adopting plastics such as polystyrene is base material because it is difficult to decompose in physical environment, with after become the waste accumulation, become one of primary pollution source of city productive life environment, caused the attention of various countries.For overcoming this problem, No. 93115669.6, Chinese invention patent application on November 9th, 1994 open phytosynthesis food packaging film manufacture method and the packing material of producing with this method, this invention is the Semen Maydis powder with according to a certain ratio, sticky rice flour, quick-acting sparklets and distilled water are placed in the container and stir, stir after treating to add a certain proportion of edible Gelatinum oxhide and glycerine again after above-mentioned compound foams, put baking oven baking certain hour into after the raw material that is flow-like after stirring gone into mould, taking out the packing film that processes then from mould puts into by paraffin, soak in the solution that the polyethylene alcohol and water is formed, become the available food package box, after reclaiming, the packing material that adopts this invention to produce to be processed into animal feed or agricultural organic fertilizer, but this patent application does not provide the outward appearance and the physicochemical property of finished product, and production process is more, is difficult to raise the efficiency.Baking box baking certain hour takes out from mould then

The object of the invention provides a kind of biodegradable packing timber plastics, utilizes the existing efficient process that adopts the polystyrene plastic base material to make food container again, to replace plastic wrapping, decontamination easily as far as possible.

The invention provides a kind of is the packaging biodegradable material that main raw material constitutes with starch, it constitutes: starch is 100 o'clock by weight, water 50-70, Mierocrystalline cellulose 1-7, water soluble resin 6-18, moisture adsorbent 2-6, stablizer 0.5-2, whipping agent 0.3-2, blowing promotor 0.3-2.

During biodegradable material provided by the present invention constitutes, described starch can be corn, wheat or yam starch, described Mierocrystalline cellulose can be cellulose acetate, carboxymethyl cellulose, ethyl cellulose or methylcellulose gum, described water soluble resin can be polyethylene oxide, polyvinyl alcohol or Synolac, described moisture adsorbent can be propylene glycol or glycerol, described stablizer can be calcium stearate or Zinic stearas, described lubricant can be silicone oil or whiteruss, described whipping agent can be one (to a sulfonyl hydrazide) phenyl ether, p-toluene sulfonyl hydrazide or Cellmic C 121, described blowing promotor can be urea or sodium bicarbonate.

Also can add additive in the biodegradable material provided by the invention, starch is 100 o'clock by weight, and additive formula is: oxidation inhibitor 0-0.1, mould inhibitor 0-1, whitening agent 0-5, coupling agent 0-1.

Oxidation inhibitor can be ditertbutylparacresol, anti-bad blood acyl cetylate or Tenox PG in the described additive, and mould inhibitor can be calcium propionate, and whitening agent can be titanium from powder, and coupling agent can be titanate coupling agent or silane coupling agent.

Utilize biodegradable material provided by the invention to make food container and can take extrusion molding mode or injection system.

Take the operation of extrusion molding mode to be:

(1) with described biodegradable material mixing and stirring, pinches and to be configured as to hand

Degree,

(2) above-mentioned raw materials adds forcing machine, forms sheet material or tubing by extrusion die,

Through between air cooling or water, press cooling, extruder temperature 100-160 ℃, machine

80-130 ℃ of head mould tool temperature,

(3) above-mentioned materials passes through traction, and is standby after the press polish after also can drawing,

(4) above-mentioned lay-by material passes through cold through vacuum forming or mold pressing post forming again

But, the oven dry, the sterilization, become required food container.Take the operation of injection system to be:

(1) with described biodegradable material mixing and stirring, pinches and to be configured as to hand

Degree,

(2) above-mentioned raw materials is sent into granulation in the tablets press, prilling temperature＜100 ℃, granulation grain

Degree 2-5mm,

(3) particulate material is put into injector, by die forming,

(4) shaped material cooling, oven dry or seasoning, sterilization become required food product packets

Packaging container.

The product appearance quality and the sense organ that utilize biodegradable material of the present invention and the method for making food container to produce require to see Table 1.

Table 1 packaging vessel outward appearance matter is put, the sense organ requirement

Sequence number	Project	Visual appearance and sense organ requirement
			1	Shape and quality	Shape is enriched, symmetry, evenly, flawless, cut, perforation and breakage
2	Color and luster	White or oyster white
			3	Surface appearance	No greasy dirt, floating dust, mildew, foreign matter
4	Smell	Slightly food, sugared fragrance

According to the mensuration and the GB3681-83 plastics natural climate exposure test method of GB6344-86 flexible foam polymkeric substance tensile strength and extension at break degree, the product physicochemical property that utilizes the present invention to produce sees Table 2.

Utilize different shape containers such as the present invention's energy scale operation cup, dish, bowl, box, on production efficiency and physicochemical property, can replace plastic packaging containers fully, and mildew-resistant, enough antiseep abilities are arranged, recyclable before easily degraded, pollution-free, the degraded as feed or organic fertilizer second stage employ.

Table 2 packaging vessel physicochemical property

Sequence number	Project	Physicochemical property
			1	Tensile strength	≥1.5MPa
2	The extension at break degree	≤2％
			3	The heatproof situation	80～100 ℃ are not had obviously distortion
4	Degradation time	At 25 ℃, under temperature 80% condition, degraded start-stop 7-60 days
			5	Water resisting property	Soaked 2 hours in 80～100 ℃ of water, do not have obviously distortion

Below provide three groups of actual proportionings of biodegradable material, all by weight.

Proportioning 1:

W-Gum 100, water 60, carboxymethyl cellulose 5, polyvinyl alcohol 16, glycerol 4, calcium stearate 1.4, whiteruss 2, to one (to an iodoxy hydrazine) phenyl ether (OBSH) 0.6, urea 0.5, ditertbutylparacresol (BHT) 0.04, calcium propionate 0.04, titanium dioxide 0.02.

Proportioning 2:

Wheat starch 100, water 55, ethyl cellulose 6, polyethylene oxide 14, propylene glycol 5, Zinic stearas 1.4, silicone oil 1.5, Cellmic C 121 (AC) 0.8, sodium bicarbonate 0.4, anti-bad blood acyl cetylate 0.03, silane coupling agent 0.3.

Proportioning 3:

Yam starch 100, water 65, cellulose acetate 5.5, Synolac 12, glycerol 4.5, calcium stearate 1.5, whiteruss 1.8, tolysulfonyl (TSH) 0.7, urea 0.6.Adopt the processing requirement and the process of extrusion molding mode and said ratio 1 to be:

The raw and auxiliary material of said ratio 1 is pulverized, use the dough mixing machine mixing and stirring, dough mixing machine power is 1.5KW, 24 rev/mins of rotating speeds, production efficiency 25kg/ hour, the raw material that stirs is sent into forcing machine and is squeezed into width 400mm, and the sheet material of thickness 1～2mm, forcing machine can adopt SJ-65 * 25 single-screw extruders, screw diameter 65mm, length-to-diameter ratio 25: 1, screw speed 12-120 rev/min, power of motor 30KW, 100-110 ℃ of forcing machine feed zone temperature, 120-130 ℃ of compression moulding section temperature, 140-155 ℃ of homogenizing zone temperature, 100-120 ℃ of extrusion die temperature.10 minutes rear haulages of the sheet material air cooling of extruding cut into 600mm length so that collect.Can adopt plastics vacuum type shaper when collecting stand-by material secondary moulding, power 8-11KW, moulding degree of depth 120mm, attached vacuum pump operating pressure 4kg/cm ², 180 liters/minute of attached air compressor machines, pressure 8-16kg/cm ², the food product containers that forms is a bowl-type, air-cooled 3 minutes, and during 20 ℃ of envrionment temperatures, seasoning 2-3 hour, with uviolizing sterilization 5-10 minute.Adopt the processing requirement and the process of injection system and said ratio 3 to be:

The raw and auxiliary material of said ratio 3 is pulverized; with aforementioned dough mixing machine stir the back granulation; tablets press also can adopt aforementioned single-screw extruder to change the extrusion die granulation; forcing machine and extrusion die need not to heat, and the particle that causes is cylindrical, and diameter and height are 3mm; particle is sent into injector after the granulation; select injector XS-ZY125 type for use, machine barrel is heated first section 80 ℃, second section 130 ℃ for three sections; the 3rd section 150 ℃; mould is heated 80-100 ℃, and injection pressure 100-120mPa is injected into the bowl-type food product containers; air-cooled 3 minutes; during 20 ℃ of envrionment temperatures, seasoning 2-3 hour, ultra-violet sterilization 5-10 minute.

Claims (4)

1. one kind is the packaging biodegradable material that main raw material constitutes with starch, it is characterized by: starch is 100 o'clock by weight, water 50-70, Mierocrystalline cellulose 1-7, water soluble resin 6-18, moisture adsorbent 2-6, stablizer 0.5-2, lubricant 0.5-2, whipping agent 0.3-2, blowing promotor 0.3-2 and additive, additive formula is: oxidation inhibitor 0-0.1, mould inhibitor 0-1, whitening agent 0-5, coupling agent 0-1

Described starch is selected from corn, a kind of in wheat or the yam starch, described Mierocrystalline cellulose is selected from cellulose acetate, carboxymethyl cellulose, a kind of in ethyl cellulose or the methylcellulose gum, described water soluble resin is selected from polyethylene oxide, a kind of in polyvinyl alcohol or the Synolac, described moisture adsorbent is selected from a kind of in propylene glycol or the glycerol, described stablizer is selected from a kind of in calcium stearate or the Zinic stearas, described lubricant is selected from a kind of in silicone oil or the whiteruss, described whipping agent is selected from one (to a sulfonyl hydrazide) phenyl ether, a kind of in p-toluene sulfonyl hydrazide or the Cellmic C 121, described blowing promotor is selected from a kind of in urea or the sodium bicarbonate.

2. biodegradable material as claimed in claim 1, it is characterized in that oxidation inhibitor can be ditertbutylparacresol, anti-bad blood acyl cetylate or Tenox PG in the described additive, mould inhibitor can be calcium propionate, whitening agent can be titanium dioxide, and coupling agent can be titanate coupling agent or silane coupling agent.

3. utilize the described biodegradable material of claim 1 to make the method for food container, it is characterized in that:

(1) described material mixing is stirred, pinching to hand can degree of being configured as,

(2) above-mentioned raw materials adds forcing machine, forms sheet material or tubing by extrusion die, cool off indirectly through air cooling or water, and 80-130 ℃ of extruder temperature 100-160 ℃, extrusion die temperature,

(3) above-mentioned materials passes through traction, and is standby after the press polish after also can drawing,

(4) above-mentioned materials again through overcooling, oven dry or seasoning, sterilization, becomes required food container through vacuum forming or mould post forming.

4. utilize the described biodegradable material of claim 1 to make the method for food container, it is characterized in that:

(1) described material mixing is stirred, pinching to hand can degree of being configured as,

(2) above-mentioned raw materials is sent into granulation in the tablets press, prilling temperature＜100 ℃, granulation grain

Degree 2-5mm,

(3) particulate material is put into injector, by die forming,

(4) shaped material cooling, oven dry or seasoning, sterilization become required food product packets

Packaging container.