CN111391352A - Forming method of dissolving pulp fiber buffer packaging material - Google Patents
Forming method of dissolving pulp fiber buffer packaging material Download PDFInfo
- Publication number
- CN111391352A CN111391352A CN202010193022.XA CN202010193022A CN111391352A CN 111391352 A CN111391352 A CN 111391352A CN 202010193022 A CN202010193022 A CN 202010193022A CN 111391352 A CN111391352 A CN 111391352A
- Authority
- CN
- China
- Prior art keywords
- dissolving
- dissolving pulp
- pulp
- fiber
- air
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
- B29C67/20—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 for porous or cellular articles, e.g. of foam plastics, coarse-pored
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Buffer Packaging (AREA)
- Paper (AREA)
Abstract
The invention discloses a forming method of a dissolving pulp fiber buffer packaging material. The invention is carried out according to the following steps: 1. mixing air-dried dissolving pulp with the water content of 5% with 7% NaOH/12% urea aqueous solution, wherein the air-dried dissolving pulp with the water content of 5% accounts for 5% of the total solution by weight, freezing the mixture for 2 to 4 hours in a low-temperature environment of-12 ℃, taking out the frozen mixture, thawing the frozen mixture at room temperature, and rapidly stirring the frozen mixture to obtain a dissolving pulp cellulose fiber dissolving system; 2. adding 30 percent of natural polymer auxiliary agent which absorbs water and swells to generate viscosity and 0.5 percent of wet strength agent into a dissolving system of cellulose fiber of dissolving pulp obtained by low-temperature dissolution, and then carrying out air drying, aging and forming; 3. and putting the obtained blank subjected to air drying, aging and molding into an inorganic weak acid, pressing, regenerating and washing, and finally washing with warm water and air drying. The forming technology of the invention does not depend on adding a chemical foaming agent to carry out foaming and pore-forming, does not need high temperature and high pressure, and is energy-saving and environment-friendly.
Description
Technical Field
The invention relates to the technical field of environment-friendly packaging materials, in particular to a forming method of a plant fiber source buffering packaging material.
Background
Among all the packaging forms, the proportion of the cushioning packaging which protects the commodities and is convenient for transportation is the largest. The domestic common plastic cushioning packaging materials comprise EPS (foam plate or Baolilong), EPE (pearl wool) and EPU, and are mainly used for packaging electric appliance products. With the rapid development of national economy and the stricter environmental protection requirements, the cushioning packaging materials derived from natural resources are more and more emphasized. The environment-friendly cushioning packaging materials used at home and abroad at present comprise 11 types of shredded paper, crepe paper, paper mats, fiber paper boards, corrugated boards, honeycomb paper boards, pulp molding, cushioning packaging paper, degradable foam plastics, regenerated foam plastics and plant fiber foaming materials. But the use of corrugated board, honeycomb board and pulp molding three types of cushioning packaging materials still dominates in the market. The corrugated board and the honeycomb board have higher manufacturing cost and unsatisfactory buffering effect; the paper pulp molding manufacturing process is complex, and only small-sized buffer packaging materials can be manufactured.
Conventional cushioning packaging materials have their own advantages and disadvantages (as shown in table 1). Therefore, in recent years, the development of plant fiber foaming materials has become a new trend. The material is prepared by using plant fiber and starch as main materials and various auxiliary agents such as an adhesive, a foaming agent, a cross-linking agent and the like as auxiliary materials, preparing a foam body by a method of mould pressing foaming, baking foaming, extrusion foaming or microwave foaming, and finally drying and shaping. The plant fiber foaming material has the advantages of no environmental pollution, relatively simple manufacturing process, low cost, rich raw materials and the like, and becomes an ideal substitute of foaming plastics such as EPS, EPU and the like. In developed countries such as europe, the united states and japan, a physical foaming process is mostly adopted, but the physical foaming process is relatively difficult to control, and the requirements on equipment and cost are high. However, the plant fiber foaming material developed in China mainly uses the foaming mode of chemical foaming agents such as Azodicarbonamide (AC), NaHCO3 and the like, researchers have carried out a great deal of work in the aspects of laboratory research and development of the plant fiber foaming material, and have obtained stage results, but have not yet reached the requirement of large-scale continuous industrial production. This is because: (1) although the process using the foaming agent is simpler than the process without the foaming agent, if the foaming agent is not selected properly, the plant fiber foamed products may have some adverse effects on the environment in the production process and the treatment process after use; (2) the foaming and forming mechanism of the foaming agent is rarely studied.
TABLE 1 comparison of properties of conventional cushioning packaging materials
Disclosure of Invention
In view of the above-mentioned situation, the present invention provides a method for molding a dissolving pulp fiber cushioning packaging material. The forming technology does not need to add a chemical foaming agent and high temperature and high pressure, and is suitable for preparing the plant fiber source buffer packaging material by low-temperature dissolution-physical pore-forming of cellulose fibers of dissolving pulp from different sources.
The technical scheme adopted for realizing the purpose of the invention is as follows:
a forming method of a dissolving pulp fiber buffer packaging material comprises the following steps:
(1) low temperature dissolution of dissolving pulp cellulose fibers:
mixing air-dried dissolving pulp with the water content of 5% with 7% NaOH/12% urea aqueous solution, wherein the 7% NaOH/12% urea aqueous solution contains 7% NaOH and 12% urea, the air-dried dissolving pulp with the water content of 5% accounts for 5% of the total solution by weight, stirring, dispersing, fully swelling to form a uniform pulp fiber suspension system, freezing for 2-4 hours in a low-temperature environment of-12 ℃, taking out, thawing at room temperature and rapidly stirring to obtain a dissolving pulp cellulose fiber dissolving system;
(2) preparation and molding of a wet blank:
adding 30% of natural polymer auxiliary agent which absorbs water and swells to generate viscosity and 0.5% of wet strength agent into the cellulose fiber dissolving system of the dissolving pulp obtained by low-temperature dissolving in the step (1), wherein the addition amount is based on the weight percentage of the oven-dried pulp (the oven-dried pulp refers to the mass of the pulp excluding water), preparing a wet blank which is moldable and has certain viscosity, pouring the wet blank into a plastic die for air drying and aging molding, and the moisture content after the air drying and aging molding is 1/3 of the moisture content of the original wet blank;
(3) washing with regenerated pore-forming warm water:
and (3) putting the air-dried, aged and molded blank obtained in the step (2) into an inorganic weak acid, pressing and regenerating and washing at the same time, and finally washing with warm water and air-drying.
The pulp fiber in the step (1) is dissolved pulp fiber. The dissolving pulp fiber is bamboo dissolving pulp.
The natural polymer auxiliary agent is starch or carboxymethyl cellulose, and the wet strength agent is polyamide polyamine epichlorohydrin resin.
The weak inorganic acid for regeneration is acetic acid.
Compared with the prior art, the invention has the beneficial effects that:
1. the forming technology of the invention takes the dissolving pulp with high cellulose content and uniform molecular weight distribution with the yield increasing year by year in the global range as a research object, is suitable for preparing the plant fiber source buffering packaging material by the dissolving pulp, in particular the bamboo dissolving pulp, and fully expands the application space of the biomass materials such as the dissolving pulp and the like in the packaging industry.
2. The forming technology of the invention does not depend on adding a chemical foaming agent to carry out foaming and pore-forming, does not need high temperature and high pressure, and is energy-saving and environment-friendly.
3. The forming technology of the invention combines the principles of a super-concentrated emulsion template method and a coprecipitation method in the preparation method of the polymer porous material to prepare the plant fiber source buffer packaging material by forming, and the pores in the material are uniformly distributed.
Drawings
FIG. 1a is the radial shrinkage of pulp fiber cushioning material prepared with the addition of various additives;
FIG. 1b shows the thickness-direction shrinkage of pulp fiber cushioning materials prepared by adding various additives;
FIG. 2a is a cross-sectional view of a pulp fiber buffer material with added softwood dissolving pulp-CMC aids;
FIG. 2b is a cross-sectional profile of a pulp fiber buffer material with added hardwood dissolving pulp-CMC additive;
FIG. 2c is a cross-sectional view of a pulp fiber buffer material with bamboo dissolving pulp-CMC additive added;
FIG. 2d is a cross-sectional view of a pulp fiber buffer material with added softwood dissolving pulp-starch aid;
FIG. 2e is a cross-sectional profile of a pulp fiber buffer material with added hardwood dissolving pulp-starch adjuvant;
FIG. 2f is a cross-sectional view of a pulp fiber buffer material with a bamboo dissolving pulp-starch additive added;
FIG. 3a is a static compressive stress-strain curve of softwood dissolving pulp fiber buffer with the addition of CMC and starch additives, respectively;
FIG. 3b is a static compressive stress-strain curve of a bamboo dissolving pulp fiber buffer material with CMC and starch additives added separately;
FIG. 3c is a static compressive stress-strain curve of EPE, a pearl wool currently in use on the market;
FIG. 3d is a static compressive stress-strain curve of expanded polystyrene EPS currently in use on the market;
FIG. 4a is a plot of vibration acceleration versus frequency characteristics for softwood dissolving pulp fiber cushioning material with CMC aids added;
FIG. 4b is a vibration acceleration-frequency characteristic curve of the bamboo dissolving pulp fiber buffer material added with the starch additive;
FIG. 4c is a vibration acceleration-frequency characteristic curve of EPE.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Example 1
(1) Firstly, tearing the dissolving pulp into paper blocks with the size of about 1cm × 1cm by a wrench, then respectively putting the paper blocks into wide-mouth bottles, and standing the wide-mouth bottles for about two weeks in a constant-temperature and constant-humidity environment for standby.
(2) As a raw material, imported dissolving pulp of softwood supplied by Okito corporation (DP 1520, α -cellulose content 93.7%, crystallinity 85%) was dissolved at low temperature in 6% NaOH/4% urea aqueous solution and 7% NaOH/12% urea aqueous solution, and two kinds of inorganic acids (5% H) were compared2SO4And 99.5% CH3COOH) to determine the composition of the NaOH/urea aqueous solution more suitable for the moulding preparation of pulp fibre reinforcement. The results of the experiment are shown in table 2.
(3) Mixing the above air-dried softwood dissolving pulp with water content of about 5% with 7% NaOH/12% urea aqueous solution (namely 7 g NaOH and 12 g urea are dissolved in 81 g water to prepare solution) is mixed according to 5% pulp concentration, stirred, dispersed, fully swollen to form a uniform pulp fiber suspension system, then frozen for 2-4 hours in a low-temperature environment of-12 ℃, taken out and thawed at room temperature, and rapidly stirred to obtain a dissolving pulp cellulose fiber dissolving system. Adding about 30 percent (based on the weight percentage of the oven dry pulp) of natural polymer auxiliary agent which absorbs water and swells to generate viscosity and about 0.5 percent (based on the weight percentage of the oven dry pulp) of wet strength agent into a dissolving system of cellulose fiber of dissolving pulp obtained by low-temperature dissolution to prepare a wet blank which can be molded and has certain viscosity. Pouring the prepared wet blank with proper viscosity into a plastic mould for air-drying, aging and forming, wherein the water content of the prepared wet blank is 1/3 of the water content of the original wet blank after air-drying and aging. Placing the obtained air-dried molded blank into an inorganic weak acid-acetic acid (CH)3COOH), while pressing, washing again, washing with warm water, and air-drying.
(4) And (3) testing the shrinkage rate of the pulp fiber buffer material molded and formed by the dissolved pulp fiber buffer packaging material prepared by the molding technology in the step (3) before and after drying, observing the section appearance of the pulp fiber buffer material, testing the tensile property of the pulp fiber buffer material and testing the vibration buffer property of the pulp fiber buffer material. The properties of the cushioning material prepared based on this molding technique are shown in fig. 1a, 1b, 2a, 2b, 2c, 2d, 2e, 2f, 3a, 3b, 3c, 3 d.
Example 2
The experimental procedure was the same as in example 1, except that the dissolving pulp raw material was commercial bamboo dissolving pulp provided in sichuan, which was characterized by a DP of 1228, α -cellulose content of 95.4% and a crystallinity of 77%. properties of the cushioning material prepared based on this molding technique are as shown in fig. 1a, 1b, 2a, 2b, 2c, 2d, 2e, 2f, 3a, 3b, 3c, 3 d.
Example 3
The experimental procedure was the same as in example 1, except that the dissolving pulp raw material was hardwood dissolving pulp produced by hunan jun tai pulp paper llc, which was characterized by a DP of 800, α -cellulose content of 98.7% and a crystallinity of 86.4%.
TABLE 2 Molding Effect of different materials
As shown in FIG. 3a, FIG. 3b, FIG. 3c and FIG. 3d, the pulp fiber buffer material prepared by adding starch adjuvant has better static buffer performance, but the static elastic modulus is slightly larger than that of the plastic buffer materials EPE and EPS used in the market at present. The vibration acceleration-frequency characteristic curves of the conifer dissolving pulp fiber reinforced buffer material added with CMC and the bamboo dissolving pulp fiber reinforced buffer material added with starch are shown in figure 4, and the peak value of the curve corresponds to the resonance frequency of the material. As can be seen from fig. 4a, 4b and 4c, the natural frequencies of the CMC-added softwood dissolving pulp fiber reinforced buffer material and the starch-added bamboo dissolving pulp fiber reinforced buffer material at the time of resonance are 102.78Hz and 103.52Hz, respectively, which are lower than the natural frequency (194.58Hz) of the currently used EPE, which indicates that the dynamic elastic modulus of the prepared dissolving pulp fiber reinforced material is slightly lower than the dynamic elastic modulus of the EPE, and the prepared dissolving pulp fiber reinforced material has good vibration damping performance.
According to the forming technology provided by the invention, among three different plant fiber source dissolving pulps, the buffer material prepared by forming the bamboo dissolving pulp is easier to regenerate and has better buffer performance; dissolving softwood pulp for the second time; the regeneration of hardwood dissolving pulp is not easy.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (5)
1. A forming method of a dissolving pulp fiber buffer packaging material is characterized by comprising the following steps:
(1) low temperature dissolution of dissolving pulp cellulose fibers:
mixing air-dried dissolving pulp with the water content of 5% with 7% NaOH/12% urea aqueous solution, wherein the 7% NaOH/12% urea aqueous solution contains 7% NaOH and 12% urea, the air-dried dissolving pulp with the water content of 5% accounts for 5% of the total solution by weight, stirring, dispersing, fully swelling to form a uniform pulp fiber suspension system, freezing for 2-4 hours in a low-temperature environment of-12 ℃, taking out, thawing at room temperature and rapidly stirring to obtain a dissolving pulp cellulose fiber dissolving system;
(2) preparation and molding of a wet blank:
adding 30% of natural polymer auxiliary agent which absorbs water and swells to generate viscosity and O.5% of wet strength agent into the cellulose fiber dissolving system of the dissolving pulp obtained by low-temperature dissolving in the step (1), wherein the addition amount is based on the weight percentage of the oven-dried pulp (the oven-dried pulp refers to the mass of the pulp excluding water), preparing a wet blank which is moldable and has certain viscosity, pouring the wet blank into a plastic die for air drying and aging molding, and the moisture content after the air drying and aging molding is 1/3 of the moisture content of the original wet blank;
(3) washing with regenerated pore-forming warm water:
and (3) putting the air-dried, aged and molded blank obtained in the step (2) into an inorganic weak acid, pressing and regenerating and washing at the same time, and finally washing with warm water and air-drying.
2. The method for forming a package material with a cushion of dissolving pulp fiber as claimed in claim 1, wherein the pulp fiber in the step (1) is dissolving pulp fiber.
3. The method as claimed in claim 2, wherein the dissolving pulp fiber is bamboo dissolving pulp.
4. The method as claimed in claim 1, wherein the natural polymer additive is starch or carboxymethyl cellulose, and the wet strength agent is polyamide polyamine epichlorohydrin resin.
5. The method as claimed in claim 1, wherein the regenerated weak inorganic acid is acetic acid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010193022.XA CN111391352A (en) | 2020-03-18 | 2020-03-18 | Forming method of dissolving pulp fiber buffer packaging material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010193022.XA CN111391352A (en) | 2020-03-18 | 2020-03-18 | Forming method of dissolving pulp fiber buffer packaging material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111391352A true CN111391352A (en) | 2020-07-10 |
Family
ID=71424698
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010193022.XA Pending CN111391352A (en) | 2020-03-18 | 2020-03-18 | Forming method of dissolving pulp fiber buffer packaging material |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111391352A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114277597A (en) * | 2021-03-30 | 2022-04-05 | 赣南师范大学 | Method for separating bamboo fiber |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101747638A (en) * | 2008-12-02 | 2010-06-23 | 王志军 | Light vegetable fiber foaming and buffering package material and preparation method thereof |
| CN105542194A (en) * | 2016-03-09 | 2016-05-04 | 天津商业大学 | Sodium hydroxide/sodium cyclamate aqueous solvent system for dissolving pulp cellulose |
| CN106584742A (en) * | 2016-12-23 | 2017-04-26 | 齐鲁工业大学 | Method for preparing foaming buffer packing material |
| CN110157077A (en) * | 2019-06-04 | 2019-08-23 | 亳州市亚洲包装材料有限公司 | A kind of degradable plastic packaging material and preparation method thereof |
| CN110330694A (en) * | 2019-05-16 | 2019-10-15 | 湖南工业大学 | A kind of starch base composite foam material freezing foaming and its preparation |
| CN110577664A (en) * | 2018-06-08 | 2019-12-17 | 淮安市冰青建设工程管理有限公司 | Preparation method of cellulose foam material |
-
2020
- 2020-03-18 CN CN202010193022.XA patent/CN111391352A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101747638A (en) * | 2008-12-02 | 2010-06-23 | 王志军 | Light vegetable fiber foaming and buffering package material and preparation method thereof |
| CN105542194A (en) * | 2016-03-09 | 2016-05-04 | 天津商业大学 | Sodium hydroxide/sodium cyclamate aqueous solvent system for dissolving pulp cellulose |
| CN106584742A (en) * | 2016-12-23 | 2017-04-26 | 齐鲁工业大学 | Method for preparing foaming buffer packing material |
| CN110577664A (en) * | 2018-06-08 | 2019-12-17 | 淮安市冰青建设工程管理有限公司 | Preparation method of cellulose foam material |
| CN110330694A (en) * | 2019-05-16 | 2019-10-15 | 湖南工业大学 | A kind of starch base composite foam material freezing foaming and its preparation |
| CN110157077A (en) * | 2019-06-04 | 2019-08-23 | 亳州市亚洲包装材料有限公司 | A kind of degradable plastic packaging material and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 马泽玉: "溶解浆纤维增强缓冲材料的制备及其性能研究", 《功能材料》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114277597A (en) * | 2021-03-30 | 2022-04-05 | 赣南师范大学 | Method for separating bamboo fiber |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102746683B (en) | Wood-residue fiber foamed cushion packaging material and preparation method thereof | |
| CN102505579B (en) | Preparation method of plant fiber cushioning material | |
| HU223262B1 (en) | Process for producing workpieces and molded pieces out of cellulose and/or cellulose-containing fiber material | |
| JP2018197419A (en) | Method for producing porous molded body | |
| CN107641242B (en) | Injection molding material | |
| CN104098922B (en) | A kind of miniaturization Plant Fiber-based Cushion Packaging Materials and preparation method thereof | |
| CN106084279A (en) | A kind of preparation method of cellulose base biodegradable expanded material | |
| FI84182B (en) | Process for producing fibre-reinforced foam bodies or cell pieces | |
| CN104987584A (en) | Chemically grafted carbon fiber/EVA compound foam material as well as preparation method and application thereof | |
| CN111391352A (en) | Forming method of dissolving pulp fiber buffer packaging material | |
| CN109608701A (en) | A kind of thermoplastic starch based foam material and preparation method | |
| CN111794017A (en) | High-stiffness pulp molding buffer material and preparation method thereof | |
| CN107236204A (en) | A kind of preparation technology of PVC wood plastic composite decorating board | |
| CN114276071A (en) | Durable building wall material and processing method | |
| CN116535730A (en) | Preparation method of plant fiber active foaming buffer material | |
| CN115748307A (en) | Laminated foam sheet molding green packaging material and preparation method thereof | |
| CN111303548A (en) | PS/TPU supercritical foaming composite material and preparation method thereof | |
| CN110922777B (en) | Light composite partition board and processing technology thereof | |
| CN108948702A (en) | A kind of preparation method of padded coaming | |
| CN104356672A (en) | Recycled paperboard fiber composite material with elasticity and barrier property and preparation method of recycled paperboard fiber composite material | |
| CN106750941A (en) | Modified polypropylene flame redardant foamed board of a kind of hydridization aramid fiber silica aerogel and preparation method thereof | |
| CN111205024A (en) | Non-combustible composite expanded polystyrene insulation board and preparation method thereof | |
| CN107033393B (en) | A kind of preparation method of the fibrous material with low frequency absorption sound insulation function | |
| CN102505580B (en) | Method for preparing plant fiber material buffer product | |
| CN115536938B (en) | Microporous plant fiber composite material and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20200710 |