CN104313950A

CN104313950A - Adhesive-free straw board producing process

Info

Publication number: CN104313950A
Application number: CN201410447586.6A
Authority: CN
Inventors: 谷照林
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-09-04
Filing date: 2014-09-04
Publication date: 2015-01-28

Abstract

An adhesive-free straw board producing process comprises the following steps: crushing straws to 10-20 meshes; adding water for pulping a paper pulp board and/ or waste paper, wherein the mass ratio of the paper pulp board and/ or the waste paper to water is 1.5-2.5: 98; adding straw powder, and the mass of the straw powder is smaller than or equal to 50% of the mass of the paper pulp board and/ or the waste paper, and uniformly mixing by grinding; adding modified starch and uniformly blending; the modified starch accounts for 1.5-2% of the total mass of the paper pulp board and/ or the waste paper and the straw powder; producing a wet blank with the moisture content of 40%-60% by using a board moulding machine; baking the wet blank for 4-8 minutes at the temperature of 170-190 DEG C till the moisture content being 28-35%; transferring the wet blank into a mould, and drying and shaping by using the board moulding machine at the temperature of 170-190 DEG C and under the pressure of 1.6Kg/cm<2>, wherein the drying time is set according to the thickness of a board; the board can be taken out when the moisture content is smaller than or equal to the ambient natural humidity within a set time. The adhesive-free straw board producing process is simple; adhesive with toxic side effects is not required, so that the adhesive-free straw board producing process is environment-friendly and low in production cost.

Description

Adhesive-free stalk mask-making technology

Technical field

The present invention relates to a kind of mask-making technology, particularly a kind of adhesive-free stalk mask-making technology.

Background technology

At present, various artificial board is adopt the material such as wood chip, wood chip, xylon mostly, and adds the adhesives such as Lauxite through extruding drying and moulding.In recent years, the artificial board made for main raw material with wheat straw, rice straw etc. of development, was also adopt identical technique, be unable to do without the adhesive of Lauxite class.Lauxite contains a large amount of formaldehyde, and formaldehyde is called as the number one killer of the interior space, toxicity is high, easily carcinogenic, easily dissociate, about 10 years deenergized period, especially larger to crowd's harm of hypoimmunity.Recent years, some enterprises produce a kind of polyurethane binder (MDI).Produce artificial board not containing formaldehyde with it, but this adhesive is expensive, sheet material production cost is improved, not easily promotes.

Summary of the invention

The object of this invention is to provide a kind of production technology simple, without the need to add any there is toxic and side effect adhesive, environmental protection, adhesive-free stalk mask-making technology that production cost is low, overcome the deficiencies in the prior art.

Adhesive-free stalk making sheet processing step of the present invention is as follows:

, the crushed stalk of will dry, after pulverizing, the order number of straw powder is 10 ~ 20 orders;

(2), by paper paddle board and/or waste paper add water and stir into paper pulp, the mass ratio of paper paddle board and/or waste paper and water is 1.5 ~ 2.5: 98; In paper pulp, add described stalk powder, the quality of stalk powder is less than or equal to 50% of paper paddle board and/or waste paper quality, then utilizes the mode of grinding that bi-material is merged uniformly, forms plant fiber pulp;

(3), in plant fiber pulp, add modified starch and stir, modified starch account for paddle board and/or waste paper, stalk powder gross mass 1.5% ~ 2%;

(4) on sheet-forming machine, make the wet embryo that moisture content is 40% ~ 60%;

(5), to wet embryo toast, the temperature of baking controls between 170 DEG C ~ 190 DEG C, and after baking, the moisture content of wet embryo is 28 ~ 35%, and baking time is 4 ~ 8 minutes;

(6), the wet embryo after baking is transferred in mould, sheet material setting machine is utilized to carry out dryness finalization, in dryness finalization process, mold temperature controls between 170 DEG C ~ 190 DEG C, operating pressure is 1.6 kilograms every square centimeter, according to the thickness setting drying time of sheet material, make sheet material reach moisture content at setting-up time and be less than or equal to naturally humidity and can take out.

Adhesive-free stalk mask-making technology of the present invention, described grinding is ground by disc mill or fluffer; Described paper paddle board and/or the mass ratio of waste paper and water are 2: 98; The quality of described stalk powder is 30% ~ 50% of paper paddle board and/or waste paper quality; Described modified starch account for paddle board and/or waste paper, stalk powder gross mass 1.75%; Described baking temperature and dryness finalization temperature are 180 DEG C; Described operating pressure is 1.6 kilograms every square centimeter.

Adhesive-free stalk mask-making technology of the present invention, through test, stalk surface is containing wax coat, inner containing a large amount of silica and adhesive.Dilute with water after crushed stalk, softening under certain high temperature, the wax coat on surface comes off, the silica that inside is contained and adhesive effluent surface, and these three kinds of materials merge together, can possess bonding, moistureproof and waterproof, the characteristic of gaining in strength.To its high-pressure again, after drying, solid sheet material will be formed.In order to reduce its fragility and intensity, allowing it and a certain proportion of paper pulp Homogeneous phase mixing, making paper fiber and the stalk after pulverizing become the dependence body be implicative of each other, adding its toughness and elasticity by these means.In order to improve sheet material water resistant and humidity resistance further, consolidating the intensity of its entirety, can consider before shaping to add a certain amount of water repellent agent and intensive, make the indices of product reach optimization.The present invention can make the various sheet material of manufacture not re-use adhesive, greatly reduces production cost, improves the competitive advantage of produce market.The sheet material produced containing formaldehyde, is not the environment-friendly products of novel ecological.Allow the discarded object (comprising the various stalks such as corn, wheat, soybean, Chinese sorghum, paddy rice) of agricultural turn waste into wealth, can alleviate peasant's crop straw burning the pollution that causes to environment.Instead of with timber is the wood-based plate of raw material, preserves the ecological environment.As long as replaceable mould, this kind of technology can the product of production difformity specification, also can realize the production of the product of 3D shape.To sum up, the present invention have production technology simple, without the need to add any there is toxic and side effect adhesive, environmental protection, advantage that production cost is low.

Detailed description of the invention

Adhesive-free stalk mask-making technology of the present invention, step is as follows:

, the crushed stalk of will dry, after pulverizing, the order number of straw powder is 10 ~ 20 orders, and wherein stalk is the stalk of various crops, as corn, soybean, wheat, Chinese sorghum, paddy rice ... Deng.

(2), by paper paddle board and/or waste paper add water and stir into after paper pulp through hydrabrusher and enter stock tank, the mass ratio of paper paddle board and/or waste paper and water is 1.5: 98 or 2: 98 or 2.5: 98, namely between 1.5 ~ 2.5: 98; In paper pulp, add the stalk powder that (1) walk pulverizing, the quality of stalk powder is less than or equal to 50% of paper paddle board and/or waste paper quality, and namely the quality of stalk powder is 30% or 35% or 40% or 45% or 50% of paper paddle board and/or waste paper quality; Then through mill or fluffer grinding, make the fusion of the various homogenize material in paper pulp, form plant fiber pulp.Optional pulp board or waste paper in this step, if select pulp board and waste paper mixing, the ratio of its consumption can be any proportioning.

(3), in plant fiber pulp, add modified starch and stir, modified starch account for paddle board and/or waste paper, stalk powder gross mass 1.5% or 1.75% or 2%, namely between 1.5% ~ 2%.The modified starch selected is enzymically modified starch, comprises enzyme modification tapioca or enzyme modification cornstarch etc.

(4), on sheet-forming machine, make the wet embryo that moisture content is 40% or 45% or 50% or 55% or 60%, namely moisture content is between 40% ~ 60%.

(5), in the mould that wet embryo is placed on to sheet material or toast in drying tunnel, the temperature of baking is 170 DEG C or 175 DEG C or 180 DEG C or 185 DEG C or 190 DEG C, namely controls between 170 DEG C ~ 190 DEG C.After baking, the moisture content of wet embryo is 28% or 29% or 30% or 31% or 32% or 33% or 34% or 35%, namely between 28% ~ 35%.Baking time is 4 minutes or 5 minutes or 6 minutes or 7 minutes or 8 minutes, namely controls between 4 ~ 8 minutes.The thickness of wet embryo is determined according to the requirement of above-mentioned water content requirement and baking time.Prevent baking time less than 4 minutes, the wax coat causing stalk powder to be had can not come off, and adhesive and silica can not reach best efficiency, also prevents baking time from causing adhesive and silica composition to lose efficacy more than 8 minutes.

(6), transfer in mould by the wet embryo after baking, utilize sheet material setting machine to carry out dryness finalization, in dryness finalization process, mold temperature controls is 170 DEG C or 175 DEG C or 180 DEG C or 185 DEG C or 190 DEG C, namely controls between 170 DEG C ~ 190 DEG C.Operating pressure is 1.4 kilograms every square centimeter or 1.5 kilograms or 1.6 kilograms or 1.7 kilograms or 1.8 kilograms, namely between 1.4 ~ 1.8 kilograms.According to the thickness setting drying time of sheet material, make sheet material reach moisture content at setting-up time and be less than or equal to naturally humidity and can take out.

The plate product taken out from sheet material setting machine, the humidity on two sides is micro-difference, in order to prevent from running into cold air distortion, will overlay on platform, just can arbitrarily movement when sheet material drops to naturally temperature after taking-up.If consider the various factors produced, air-cooled way fast cooling can be taked.

Claims

1. an adhesive-free stalk mask-making technology, is characterized in that: described mask-making technology step is as follows:

(6), the wet embryo after baking is transferred in mould, sheet material setting machine is utilized to carry out dryness finalization, in dryness finalization process, mold temperature controls between 170 DEG C ~ 190 DEG C, operating pressure is 1.4 ~ 1.8 kilograms every square centimeter, according to the thickness setting drying time of sheet material, make sheet material reach moisture content at setting-up time and be less than or equal to naturally humidity and can take out.

2. adhesive-free stalk mask-making technology according to claim 1, is characterized in that: described grinding is ground by disc mill or fluffer; Described paper paddle board and/or the mass ratio of waste paper and water are 2: 98; The quality of described stalk powder is 30% ~ 50% of paper paddle board and/or waste paper quality; Described modified starch account for paddle board and/or waste paper, stalk powder gross mass 1.75%; Described baking temperature and dryness finalization temperature are 180 DEG C; Described operating pressure is 1.6 kilograms every square centimeter.