CN212505590U - Special mould proof cardboard paper manufacture equipment of agricultural product - Google Patents

Abstract

The utility model provides a special mould proof boxboard manufacturing installation of agricultural product, including rotary drum pulper, high concentration desander, coarse screen system, fibre classifying screen, the long fibre desander that communicates in proper order, the equipment still include the short fibre desander that communicates in proper order, polydisc thickener, short fibre thick liquid pond, the short fibre desander with the fibre classifying screen be linked together, the equipment still include the fine screen, polydisc thickener, heat dispersion system, thick liquid pond and the mill that communicate in proper order, the fine screen with the long fibre desander be linked together, the equipment still include surface layer paper machine thick liquid pond, bottom layer paper machine thick liquid pond, surface layer head box and bottom head box, the thick liquids in the short fibre thick liquid pond flow into surface layer paper machine thick liquid pond and bottom layer paper machine thick liquid pond, the thick liquids in the mill flow into bottom layer paper machine thick liquid pond, the paper pulp in the surface layer paper machine thick liquid pond flow into the surface layer head box in, and the paper pulp in the bottom layer paper machine pulp tank flows into the bottom layer pulp tank.

Description

Special mould proof cardboard paper manufacture equipment of agricultural product

Technical Field

The utility model relates to a pulping and papermaking technical field especially relates to a special mould proof cardboard paper manufacture equipment of agricultural product.

Background

The carton is because its quality is light, and size specification can change according to the demand, is used in the packing transportation of various agricultural products widely. However, in the storage and transportation process of agricultural products, the outer packaging paper box of the products is affected with damp due to the change of temperature and humidity of the transportation environment, or absorbs moisture on the surfaces of products such as vegetables, fruits and the like in the box, and the mould breeding is very easy to occur in the closed space inside the box after the box is affected with damp, so that the product quality is affected, and therefore, many enterprises still select to use the disposable foam or the plastic basket as a transportation carrier. In addition, unlike the transportation process of products with relatively high precision such as electric appliances and furniture, the probability that the agricultural products and their byproducts are treated roughly during the transportation and transportation process is quite large, and therefore the performance requirements of the packing cartons for the products are not inferior to those of other products. However, domestic wood fiber resources are very short, the price of raw wood pulp is always high, in agriculture with low profit rate, few enterprises are willing to use wood pulp or part of wood pulp to produce packaging paper and paper boards as packaging cartons of products, and secondary fibers are basically used as main raw materials. The fiber quality of the paper pulp made from domestic recycled waste paper tends to decrease with the increase of the recycling times. Therefore, in the process of producing paper and paperboard, a large amount of starch is added in a paper mill to increase the strength of paper and the bonding strength between layers, and the existence of the starch provides a carbon source for breeding and propagation of bacteria. Although various organic bactericides and preservatives are added in the production process of paper and paperboard to increase the antibacterial and mildewproof capability of the paper, the organic bactericides have a certain effective period due to the problems of heat resistance, easy hydrolysis and the like, a quite long time is required from the processing of the paperboard to the delivery of the carton to an end customer, and the use amount is strictly limited due to the influence of cost. Therefore, how to produce the low-cost high-quality mildew-proof box paperboard meeting the requirements of customers by using the secondary fiber raw material is a problem to be solved urgently by the packaging paper mill at present.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a special mould proof cardboard paper manufacture equipment of agricultural product.

In order to solve the technical problem, the utility model provides a special mould proof boxboard manufacturing equipment of agricultural product, the equipment include rotary drum pulper, high enriched desander, coarse screen system, fibre classifying screen, the long fiber desander that communicate in proper order, the equipment still include the short fiber desander that communicates in proper order, polydisc concentrator, short fiber thick liquid pond, the short fiber desander communicate with the fibre classifying screen, the equipment still include the fine screen, polydisc concentrator, heat dispersion system, thick liquid pond and the mill that communicate in proper order, the fine screen with the long fiber desander communicate, the equipment still include surface course paper machine thick liquid pond, bottom paper machine thick liquid pond, surface course head box and bottom head box, the thick liquids in the short fiber thick liquid pond flow into surface course paper machine thick liquid pond and bottom paper machine thick liquid pond, the thick liquids in the mill flow into bottom paper machine thick liquid pond, the paper pulp in the surface layer paper machine pulp tank flows into the surface layer pulp box, the paper pulp in the bottom layer paper machine pulp tank flows into the bottom layer pulp box, the paper making machine further comprises a paper making machine, the paper making machine comprises a net part, a pressing part, a front drying part, a surface sizing device, a rear drying part and a calendaring part which are sequentially arranged, and the paper pulp in the surface layer pulp box and the bottom layer pulp box flows to the net part.

Preferably, the apparatus further comprises a curl rewinding device through which the paper passing through the calender section passes.

Preferably, the coarse screen system is a 0.5mm round hole coarse screen, the size of the screen seam of the fiber grading screen is 0.25mm, and the size of the screen seam of the fine screen is 0.2 mm.

Preferably, the equipment further comprises a papermaking additive adding device, wherein the papermaking additive adding device comprises a static mixer and a screen, the static mixer is used for mixing papermaking additives, and the additives in the static mixer pass through the screen and then enter the surface layer headbox and the bottom layer headbox.

Preferably, the mesh size of the screen before the net is 0.35 mm.

Preferably, the papermaking auxiliary agent adding device further comprises a retention and drainage aid adding device, and the retention and drainage aid adding device is used for adding retention and drainage aids into the papermaking auxiliary agent and the slurry which pass through the static mixer.

Preferably, the surface sizing device comprises a starch paste storage tank for storing starch paste, a surface layer adhesive trough, a bottom layer adhesive trough, an upper roller and a lower roller, wherein the surface layer adhesive trough and the bottom layer adhesive trough are communicated to the starch paste storage tank, the surface layer adhesive trough is used for supplying sizing agent to the upper roller, the bottom layer adhesive trough is used for supplying sizing agent to the lower roller, and paper passes through the space between the upper roller and the lower roller.

Preferably, the surface sizing device further comprises a nano zinc oxide adding device for adding nano zinc oxide into the starch paste storage tank.

Preferably, the surface sizing device further comprises a surface sizing auxiliary adding device, and the surface sizing auxiliary adding device is used for adding the surface sizing auxiliary into the surface layer sizing trough and the bottom layer sizing trough.

Preferably, the surface sizing device further comprises a glue groove, wherein the glue groove is formed in the lower sides of the upper roller and the lower roller and used for collecting sizing agents flowing out of the upper roller and the lower roller.

The utility model discloses a special mould proof cardboard paper manufacture equipment of agricultural product uses the rotary drum pulper to carry out the pulping to useless case cardboard in the pulping workshop section and handles, protects impurity and sticky as far as possible simultaneously again and not by excessive breakage, is favorable to getting rid of follow-up workshop section. Then, after the high-concentration slag separator, the fine pulp enters a fine screen system with a screen gap of 0.25mm through a 0.5mm round hole coarse screen, 65% of fine pulp (short fibers) passes through the screen gap and is sent to a low-concentration sand remover to further remove impurities, and ash in part of the pulp is removed through washing and concentration of a multi-disc concentrator. Most of stickies and plastic impurities are intercepted in the long fibers, so that equipment such as a fine screen and a heat dispersion system of short fiber pulp is omitted, and the cost of the pulping stage is saved. The sticky matters and plastic impurities enter a low-concentration sand remover and a fine screen system with a screen gap of 0.2mm together with the long fiber slurry to be removed, and the long fibers purified by the operation are further treated by a multi-disc and thermal dispersion system to ensure that the cleanliness of the slurry meets the slurry quality requirement.

A double-element reinforcing system consisting of a wet strength agent (PAE) and a dry strength agent (amphoteric polyacrylamide) is adopted in a wet-end approach working section to improve the wet strength and the dry strength of paper, so that the paper still has certain strength when being applied to different agricultural product packages and special transportation environmental conditions, internal products can be effectively protected, and the produced boxboard can obtain the moisture resistance through double sizing. And in the preparation process of the sizing agent in the pulp and the surface glue solution, the nano zinc oxide is added into the starch paste solution for preparing the sizing material, so that the paperboard has stable and lasting antibacterial performance and higher market competitiveness.

Drawings

FIG. 1 is a schematic view of the agricultural product-specific mildewproof cardboard paper manufacturing equipment of the present application;

FIG. 2 is a schematic view of a papermaking agent addition apparatus of the present application;

fig. 3 is a schematic view of the structure of the surface sizing device of the present application.

Detailed Description

The present invention is further described with reference to the following drawings and specific embodiments so that those skilled in the art can better understand the present invention and can implement the present invention, but the embodiments are not to be construed as limiting the present invention.

As shown in figure 1, the utility model provides a special mould proof boxboard manufacturing equipment for agricultural products, the equipment comprises a rotary drum pulper, a high concentration desander, a coarse screen system, a fiber grading screen and a long fiber desander which are communicated in sequence, the equipment also comprises a short fiber desander, a multi-disc thickener and a short fiber pulp tank which are communicated in sequence, the short fiber desander is communicated with the fiber grading screen, the equipment also comprises a fine screen, a multi-disc thickener, a heat dispersion system, a pulp tank and a millstone which are communicated in sequence, the fine screen is communicated with the long fiber desander, the equipment also comprises a surface layer paper machine pulp tank, a bottom layer paper machine pulp tank, a surface layer paper machine pulp tank and a bottom layer pulp tank, the pulp in the short fiber pulp tank flows into the surface layer paper machine pulp tank and the bottom layer paper machine pulp tank, the pulp in the millstone flows into the bottom layer paper machine pulp tank, the paper pulp in the surface layer paper machine pulp tank flows into the surface layer pulp box, the paper pulp in the bottom layer paper machine pulp tank flows into the bottom layer pulp box, the paper making machine further comprises a paper making machine, the paper making machine comprises a net part, a pressing part, a front drying part, a surface sizing device, a rear drying part and a calendaring part which are sequentially arranged, and the paper pulp in the surface layer pulp box and the bottom layer pulp box flows to the net part. The apparatus further comprises a curl rewinding device through which the paper passing through the calender section passes. In a preferred embodiment, the coarse screen system is a 0.5mm round hole coarse screen, the size of the screen gap of the fiber grading screen is 0.25mm, and the size of the screen gap of the fine screen is 0.2 mm.

As shown in fig. 2, the apparatus further includes a papermaking additive adding device, the papermaking additive adding device includes a static mixer for mixing papermaking additives and a screen, and the additives in the static mixer pass through the screen and then enter the surface layer headbox and the bottom layer headbox. The screen slot size of the screen in front of the screen is 0.35 mm. The papermaking auxiliary agent adding device also comprises a retention and drainage aid adding device, and the retention and drainage aid adding device is used for adding retention and drainage aids into the papermaking auxiliary agent and the pulp which pass through the static mixer.

As shown in fig. 3, the surface sizing device includes a starch paste storage tank for storing starch paste, a surface layer adhesive trough, a bottom layer adhesive trough, an upper roller and a lower roller, the surface layer adhesive trough and the bottom layer adhesive trough are communicated to the starch paste storage tank, the surface layer adhesive trough is used for providing sizing agent for the upper roller, the bottom layer adhesive trough is used for providing sizing agent for the lower roller, and paper passes through between the upper roller and the lower roller. The surface sizing device also comprises a nano zinc oxide adding device for adding nano zinc oxide into the starch paste storage tank. The surface sizing device also comprises a surface sizing auxiliary adding device, and the surface sizing auxiliary adding device is used for adding a surface sizing auxiliary into the surface layer sizing trough and the bottom layer sizing trough. The surface sizing device also comprises a glue groove, wherein the glue groove is formed in the lower sides of the upper roller and the lower roller and used for collecting sizing agents flowing out of the upper roller and the lower roller.

The special mould proof case cardboard manufacture equipment of agricultural product of this application's concrete working procedure is as follows:

s1: after the waste paper box passes through a drum pulper, a high-concentration desander and a coarse screening system, the pulp is screened according to the length of the fiber through a fiber grading screen with the screen gap of 0.25mm to obtain 65% of short fiber, light impurities are removed through a low-short fiber sander, and then the short fiber is sent to a first multi-disc thickener for washing, so that ash and impurities in the pulp are further removed.

After 35% of long fiber pulp obtained after screening by a fiber grading sieve passes through a long fiber sand remover, impurities such as stickies are further removed by using a fine sieve with a sieve plate gap of 0.2mm, then the paper pulp is concentrated to 10% -15% by using a second multi-disc thickener, the paper pulp is sent to a thermal dispersion system, and finally the paper pulp is sent to a bottom layer pulp pool of a paper machine after being subjected to pulp pool and disc grinding fine pulp. The invention directly divides the pulp into long fibers and short fibers, the prepared short fibers are directly sent into a surface layer paper machine pulp tank, and the bottom layer pulp is prepared by mixing the long fibers and the short fibers according to the proportion of 1: 1 and mixing. The slurry is dynamically conveyed in the whole pulping process, so that the accumulation of the rotten slurry caused by the relatively static state of the slurry in the large slurry storage tower is avoided.

S2: in step S2, a paper making auxiliary agent is added in a flow system of a paper machine, and for the special mildew-proof case paper board for agricultural product packaging, the main paper making auxiliary agent is a functional auxiliary agent and mainly comprises dye, a dry strength agent, a wet strength agent, an internal sizing agent, nano zinc oxide and a retention and drainage aid. The method is characterized in that a flow system of a paper machine is added with polyamide epichlorohydrin (PAE) resin wet strength agent and other papermaking auxiliary agents, the wet strength agent and other papermaking auxiliary agents are uniformly distributed in paper pulp through a static mixer, the PAE can form covalent bonding with carboxyl of fibers in the paper, and a water-insoluble network structure is formed through a bridging reaction among self molecules to protect hydrogen bonding among the fibers. PAE is diluted to 1% by clear water or purified papermaking white water (SS is lower than 10mg/L), added at the outlet of a fan pump of a paper machine, and the addition amount is between 0.05% and 0.4% (effective solid content/absolute dry weight of finished paper), and can be adjusted according to actual needs. In a preferred embodiment, the present invention uses an amphoteric polyacrylamide dry strength agent to form a dual-component reinforcing system, which not only improves the wet strength and dry strength of the paper, but also improves the retention and drainage of the pulp on the wire section of the paper machine, simultaneously with the use of PAE.

S3: after passing through a head box, the pulp enters a net part for dehydration, a pressing part for dehydration and a drying part for dehydration, and the surface of a dried paper sheet is uniformly coated with sizing materials, namely surface sizing. The film forming mechanism is that after the surface sizing agent acts on paper sheets, a layer of adhesive film is formed on the surfaces of the paper sheets, so that the water resistance of the paper sheets is improved. Whether styrene-acrylate copolymer Emulsions (SAE) or Alkyl Ketene Dimers (AKD) are used as surface sizing aids. The invention provides a method for preparing a surface sizing agent, which is characterized in that starch is used as an emulsifier to prepare sizing materials, and nano zinc oxide with the particle size less than 2nm is added into a starch preparation tank in the process of preparing the surface sizing agent, and the addition amount is 0.1-1%. In recent years, inorganic antibacterial materials have been attracting much attention because of their safety, durability and chemical stability. The nanometer zinc oxide can automatically decompose free moving negatively charged electrons under the sunlight, especially under the ultraviolet irradiation, and the left positively charged holes can change water and air on the surface into oxygen and hydroxyl with strong redox effect, so that cell membrane damage can weaken the cell proliferation capacity and death can be realized. The glue applying device adopts a vertical roller type glue applying device, glue materials are sprayed on the glue applying rollers through full-width glue tubes respectively arranged on the upper roller and the lower roller, the glue materials form a layer of film which is uniformly distributed on the surfaces of the glue applying rollers and are transferred to the surfaces of paper, a glue groove is arranged at the bottom of the lower roller and is used for bearing redundant glue solution extruded by the upper roller and the lower roller, and the glue solution in the glue groove is purified and then is completely sent to a feeding pipe at the bottom layer. Compared with a metering rod and a scraper, the sizing cost can be effectively reduced.

The utility model discloses a special mould proof cardboard paper manufacture equipment of agricultural product uses the rotary drum pulper to carry out the pulping to useless case cardboard in the pulping workshop section and handles, protects impurity and sticky as far as possible simultaneously again and not by excessive breakage, is favorable to getting rid of follow-up workshop section.

Then, after a high-concentration slag separator, the fine pulp enters a fiber grading sieve system with a sieve gap of 0.25mm through a 0.5mm round hole coarse sieve, 65% of fine pulp (short fibers) passes through the sieve gap and is sent to a low-concentration sand remover to further remove impurities, and ash in part of the pulp is removed through washing and concentration of a multi-disc concentrator. Most of stickies and plastic impurities are intercepted in the long fibers, so that equipment such as a fine screen and a heat dispersion system of short fiber pulp is omitted, and the cost of the pulping stage is saved. The sticky matters and plastic impurities enter a low-concentration sand remover and a fine screen system with a screen gap of 0.2mm together with the long fiber slurry to be removed, and the long fibers purified by the operation are further treated by a multi-disc and thermal dispersion system to ensure that the cleanliness of the slurry meets the slurry quality requirement.

A double-element reinforcing system consisting of a wet strength agent (PAE) and a dry strength agent (amphoteric polyacrylamide) is adopted in a wet-end approach working section to improve the wet strength and the dry strength of paper, so that the paper still has certain strength when being applied to different agricultural product packages and special transportation environmental conditions, internal products can be effectively protected, and the produced boxboard can obtain the moisture resistance through double sizing. And in the preparation process of the sizing agent in the pulp and the surface glue solution, the nano zinc oxide is added into the starch paste solution for preparing the sizing material, so that the paperboard has stable and lasting antibacterial performance and higher market competitiveness.

The above-mentioned embodiments are merely preferred embodiments for fully explaining the present invention, and the scope of the present invention is not limited thereto. Equivalent substitutes or changes made by the technical personnel in the technical field on the basis of the utility model are all within the protection scope of the utility model. The protection scope of the present invention is subject to the claims.

Claims (10)

1. The mildew-proof boxboard paper manufacturing equipment special for agricultural products is characterized by comprising a rotary drum pulper, a high-concentration desander, a coarse screen system, a fiber grading screen and a long fiber desander which are sequentially communicated, and also comprising a short fiber desander, a first multi-disc thickener and a short fiber pulp tank which are sequentially communicated, wherein the short fiber desander is communicated with the fiber grading screen, the equipment also comprises a fine screen, a second multi-disc thickener, a heat dispersion system, a pulp tank and a millstone which are sequentially communicated, the fine screen is communicated with the long fiber desander, the equipment also comprises a surface layer paper machine pulp tank, a bottom layer paper machine pulp tank, a surface layer pulp tank and a bottom layer pulp tank, pulp in the short fiber pulp tank flows into the surface layer paper machine pulp tank and the bottom layer paper machine pulp tank, and pulp in the millstone flows into the bottom layer paper machine pulp tank, the paper pulp in the surface layer paper machine pulp tank flows into the surface layer pulp box, the paper pulp in the bottom layer paper machine pulp tank flows into the bottom layer pulp box, the paper making machine further comprises a paper making machine, the paper making machine comprises a net part, a pressing part, a front drying part, a surface sizing device, a rear drying part and a calendaring part which are sequentially arranged, and the paper pulp in the surface layer pulp box and the bottom layer pulp box flows to the net part.

2. An apparatus as set forth in claim 1, characterized in that the apparatus further comprises a curl rewinding device through which the paper sheet passing through the calender section passes.

3. The apparatus of claim 1, wherein the coarse screen system is a 0.5mm round hole coarse screen, the fiber sizing screen has a slot size of 0.25mm, and the fine screen has a slot size of 0.2 mm.

4. The apparatus of claim 1, further comprising a papermaking agent addition device comprising a static mixer for uniformly mixing the stock with the papermaking agent, a screen, wherein the agent in the static mixer passes through the screen and enters the face and bottom headboxes.

5. The apparatus of claim 4, wherein the pre-wire screen has a mesh size of 0.35 mm.

6. The apparatus according to claim 5, wherein the papermaking agent addition device further comprises a retention and drainage agent addition device for adding a retention and drainage agent to the slurry passing through the static mixer and homogeneously mixed with the papermaking agent.

7. The apparatus as set forth in claim 1, wherein said surface sizing device includes a starch paste storage tank for storing starch paste, a surface sizing tank for supplying sizing agent to said upper roller, a bottom sizing tank for supplying sizing agent to said lower roller, upper rollers and lower rollers, said surface sizing tank and said bottom sizing tank being connected to said starch paste storage tank, said surface sizing tank being adapted to supply sizing agent to said upper roller, said bottom sizing tank being adapted to supply sizing agent to said lower roller, and paper passing between said upper and lower rollers.

8. The apparatus of claim 7, wherein said surface sizing device further comprises a nano zinc oxide adding device for adding nano zinc oxide into said starch paste storage tank.

9. The apparatus of claim 8, wherein said surface sizing device further comprises a surface sizing aid adding device for adding a surface sizing aid to said top coat applicator hopper and said bottom coat applicator hopper.

10. The apparatus of claim 9, wherein said surface sizing device further comprises a glue trough disposed on the underside of said upper and lower rollers for collecting sizing material flowing from said upper and lower rollers.

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