CN119162867B

CN119162867B - Kraft paper-tin foil composite material for packaging bags and production process thereof

Info

Publication number: CN119162867B
Application number: CN202411564313.XA
Authority: CN
Inventors: 彭应军
Original assignee: Hubei Kangding Packaging Co ltd
Current assignee: Hubei Kangding Packaging Co ltd
Priority date: 2024-11-05
Filing date: 2024-11-05
Publication date: 2025-04-11
Anticipated expiration: 2044-11-05
Also published as: CN119162867A

Abstract

The present application relates to a kraft paper-tin foil composite material for packaging bags, and relates to the technical field of composite packaging bags, which comprises a color developing layer, an adhesive layer, a kraft paper layer and a tin foil layer arranged in sequence, wherein the color developing layer is a zinc silicate fluorescent brightener, and the adhesive layer is a starch adhesive layer. The present application has the effect of facilitating the improvement of the printing performance of the packaging bag while improving the thermal insulation performance and strength of the packaging bag.

Description

Kraft paper-tinfoil paper composite material for packaging bag and production process thereof

Technical Field

The application relates to the technical field of packaging bags, in particular to a kraft paper-tinfoil paper composite material for packaging bags.

Background

The packaging bag is used for packaging various articles, so that the articles are convenient to transport and store in the production and circulation processes. Thus, the packaging bag is used in daily life and industrial production. At present, in order to consider food safety, plastic bags are generally abandoned, and common food packaging bags comprise kraft paper bags and tinfoil paper bags.

The kraft paper bag has strong wear resistance and tear resistance, can bear certain weight and pressure, has good air permeability, is favorable for keeping freshness and ventilation of articles in the belt, and is particularly suitable for packaging articles needing air permeability.

The tinfoil paper packaging bag has good sealing performance, can effectively prevent invasion of external factors such as oxygen, moisture, peculiar smell and the like, so that the fresh-keeping period of food is prolonged.

In view of the above, the kraft paper bags tend to have poor moisture resistance and relatively rough surfaces when used as packaging bags, and the uneven phenomenon tends to occur when ink is printed on the surface of the kraft paper bags when the surface of the kraft paper bags is printed, so that the effect is inferior to that of the white cardboard packaging bags and plastic bags when the patterns with rich colors are printed, while the cost is high when the tinfoil paper is used as packaging bags, and the tinfoil paper packaging bags have good heat insulation performance but poor strength, so that the kraft paper and the tinfoil paper are required to be improved when being used as packaging bags alone.

Disclosure of Invention

In order to facilitate improving the printing performance of the packaging bag and simultaneously improving the heat preservation performance and strength of the packaging bag, the application provides a kraft paper-tinfoil paper composite material for the packaging bag.

The kraft paper-tinfoil paper composite material for the packaging bag provided by the application adopts the following technical scheme:

The kraft paper-tinfoil paper composite material for the packaging bag comprises a color developing layer, an adhesive layer, a kraft paper layer and a tinfoil paper layer which are sequentially arranged, wherein the color developing layer is a zinc silicate fluorescent brightening agent, and the adhesive layer is a starch adhesive layer.

Through adopting above-mentioned technical scheme, the starch class adhesive layer of setting is as the adhesive of wrapping bag, and when the starch class adhesive layer was glued kraft paper layer and tinfoil paper layer, the starch was difficult for passing through the atomic gap of tinfoil paper as the macromolecule, and starch class adhesive possesses nontoxic effect in comparison with other adhesives to further promote the security performance of food wrapping bag.

The fluorescent agent is coated on the surface of the kraft paper layer, so that the coloring performance of the kraft paper layer is improved, and when the kraft paper-tinfoil composite material is used as a packaging bag, the coloring degree of the kraft paper layer is improved when the surface of the kraft paper layer is printed, and the attractiveness of the packaging bag is improved.

S1, uncoiling and flattening the tinfoil paper and the kraft paper layer, and coating starch glue on the surface of the tinfoil paper by using a composite device to uniformly coat the starch glue on the surface of the tinfoil paper layer;

S2, synchronously coating the surface of the kraft paper layer with a fluorescent agent through a composite device, uniformly coating the fluorescent agent on the surface of the kraft paper layer, and improving the color development performance of the surface of the kraft paper;

s3, extruding and compounding the kraft paper layer and the tinfoil paper layer through compounding equipment to enable the kraft paper layer and the tinfoil paper layer to be glued and compounded, and adsorbing and drying moisture through the adhesive layer between the kraft paper layer and the tinfoil paper layer through compounding equipment to achieve rapid compounding and drying of the kraft paper layer and the tinfoil paper layer, so that the kraft paper-tinfoil paper composite material is formed;

S4, detecting the surface of the kraft paper layer-tinfoil paper composite material through composite equipment, judging whether the kraft paper layer is damaged through the color reaction generated by the starch glue and the zinc silicate fluorescent brightening agent, marking the damaged position, and subsequently shearing the damaged position to reduce the sanitation problem caused by the chemical agent entering the packaging bag;

and S5, coating starch glue on the tinfoil paper of the kraft paper layer-tinfoil paper composite material formed in the step S4 through a compounding device, and compounding one side of the new kraft paper layer with one side of the tinfoil paper layer to form the kraft paper-tinfoil paper-kraft paper three-layer composite material.

The composite equipment is used for coating starch glue in the interlayer of kraft paper and tinfoil paper, and the composite equipment is used for adsorbing moisture of the starch glue on the tinfoil paper, because the starch glue mainly has the binding effect of starch, pasting agent, oxidant and the like, the water is used as a solution in the adhesive to mainly improve the fluidity of the adhesive, and the moisture content cannot be too small for coating the whole surface of the tinfoil paper at the moment, so that the whole adhesive property and coating property are improved, after carrying out the coating of adhesive through the equipment that compounds to the surface of tinfoil, when carrying out roll-in and absorption to combined material in the outside of kraft paper this moment, because starch, gelatinization agent etc. are difficult for passing through kraft paper, moisture is convenient for pass through kraft paper, therefore when adsorbing in kraft paper one side, moisture floats to the surface of kraft paper through kraft paper easily to be convenient for solidify and dry to the adhesive layer, thereby promote combined material's compound efficiency and complex property.

And meanwhile, after the moisture is adsorbed on one side of the kraft paper, the fluorescent brightening agent is coated on one side of the kraft paper, and as the zinc silicate fluorescent brightening agent is also water-soluble, the adhesion performance of the zinc silicate fluorescent brightening agent attached to the surface of the kraft paper is improved, so that the content of the moisture in the fluorescent brightening agent is reduced, and the subsequent drying and curing efficiency of the fluorescent brightening agent is improved.

If kraft paper breaks, when using as the wrapping bag as combined material this moment, only tinfoil paper as the support this moment breaks the department, intensity is not enough, break easily to influence the storage cycle of packing bag interior article when using as the wrapping bag, and because fluorescent brightening agent is inedible medicament, influence the roll-in and the absorption that the wrapping bag passes through combined device simultaneously easily, when kraft paper produced the fracture, absorption through combined device this moment, starch adhesive is easy through breaking the department this moment, starch adhesive reacts with zinc silicate fluorescent brightening agent this moment, produce the green-yellow reaction, thereby be convenient for directly perceivedly whether the circumstances of breaking exists.

And if kraft paper does not have the circumstances of breaking, macromolecules such as starch, gelatinization agent are difficult for passing through kraft paper, then be difficult for producing colour reaction this moment, only moisture passes through kraft paper easily to be convenient for fluorescent brightening agent's adhesion promotes the colorability of kraft paper, and fluorescent brightening agent is difficult for getting into the wrapping bag inboard, thereby promotes the security performance when using as food packaging bag.

Through finally forming kraft paper-tinfoil paper-kraft paper three-layer structure's combined material, further promote the tear resistance of whole wrapping bag after making the wrapping bag, and make the wrapping bag possess the printing performance of kraft paper and the thermal insulation performance of tinfoil paper simultaneously, promote the security performance when using as the wrapping bag simultaneously.

Optionally, the composite device in steps S1-S4 includes a frame, a rolling assembly disposed on the frame, a detecting assembly disposed on the frame, and a coating assembly disposed on the frame;

The rolling assembly comprises flattening rollers and rotating parts, wherein the flattening rollers are rotatably arranged on the frame, the rotating parts are used for driving the flattening rollers to rotate, two flattening rollers are arranged oppositely, and a gap for kraft paper and tinfoil paper to pass through is reserved between the two flattening rollers;

The detection assembly comprises an optical camera assembly arranged on the rack, a marking piece movably arranged on the rack and a driving piece for movably driving the marking piece, and the optical camera assembly is electrically connected with the driving piece;

The coating assembly comprises a glue spreader arranged on the frame, a coating rod arranged on the frame and a rotating part for driving the glue spreader to rotate, wherein the glue spreader is positioned on one side of the flattening roll close to the input direction, the glue spreader stretches into a gap between kraft paper and tinfoil paper, one side of the glue spreader close to the kraft paper is attached to the tinfoil paper, the coating rod is positioned on one side of the flattening roll far away from the input direction, a plurality of coating holes are formed in the coating rod, the coating holes are distributed along the length direction of the coating rod at intervals, a coating box is arranged on the frame, zinc silicate brightening agent is stored in the coating box, the coating box is communicated with the coating rod, a glue box is arranged in the glue spreader, starch adhesive is stored in the glue box, the glue box is fixed with the frame, the glue box is communicated with the coating rod, and an extruding part for periodically extruding the adhesive in the glue box is further arranged in the glue spreader.

Through adopting above-mentioned technical scheme, when producing combined material, technical personnel decoiles kraft paper and tinfoil paper this moment, then make kraft paper and tinfoil paper all carry towards between two flattening rollers, the in-process of carrying, starch adhesive in the glue tank extrudes to the flattening roller through extruding the piece in, extrude to the surface of tinfoil paper through the intercommunicating pore, extrude starch adhesive periodicity through the extruding piece that sets up to reduce starch adhesive and continue the waste that extrudes and cause, simultaneously because the transportation of whole kraft paper and tinfoil paper is periodic, extrude through the periodicity of extruding the piece, carry out the periodic coating of adhesive to the tinfoil paper surface according to whole transportation rhythm.

Meanwhile, after the adhesive coating is finished on the surface of the tinfoil paper, the kraft paper and the tinfoil paper are subjected to composite rolling through the flattening roller to form a kraft paper-tinfoil paper composite material, after the rolling is finished, the fluorescent brightening agent is coated on the surface of the kraft paper through the set coating rod, and when the composite material is not dried completely, the fluorescent brightening agent is coated, so that drying steps in two coating processes of the composite material and the colorant are reduced, the composite efficiency of the whole composite material is improved, and the coloring performance of the composite material serving as a packaging material is improved.

When the colorant is coated, the composite material is not dried completely, and the moisture in the adhesive is used as a solvent of the colorant, so that the adhesion performance of the colorant on the kraft paper surface is improved.

Optionally, the extrusion piece is including locating connecting pipe on the glue tank and locating the slip set up in the shutoff piece on the shutoff pipe, the connecting pipe with the glue tank is linked together, the glue spreader cavity is laid, multiunit the intercommunicating pore is followed the circumference direction interval of glue spreader is evenly laid, the periphery side cladding of glue spreader is equipped with the foam-rubber cushion, the foam-rubber cushion is laminated with the surface of tinfoil paper mutually, the shutoff hole has been seted up on the periphery wall of connecting pipe, the shutoff piece slip set up in the shutoff hole, the shutoff piece is equipped with two, and two the shutoff piece is laid relatively, two the one side activity laminating that the shutoff piece is close to each other, when two the shutoff piece is laminated mutually, the connecting pipe by the shutoff piece, just still be equipped with in the glue spreader right the shutoff piece carries out slip adjustment.

Through adopting above-mentioned technical scheme, when the glue spreader rotates, carry out sliding adjustment to the shutoff piece through the regulating part that sets up, when the glue spreader rotates to the position that connecting pipe and intercommunicating pore are corresponding, regulating part drive shutoff piece slides to the state of mutually separating this moment, thereby make the connecting pipe realization this moment open steadily, realize starch adhesive's stable coating, when the glue spreader rotates to the position that connecting pipe and intercommunicating pore phase separated, the shutoff piece is adjusted to the position of laminating each other this moment by the regulating part, carry out the shutoff to the connecting pipe, so be a cycle, through this kind of circulation, realize periodically extruding starch adhesive.

Meanwhile, through the sponge cushion, scraping generated when the sponge cushion is attached to kraft paper after the communicating holes are formed in the glue spreader is reduced, the surface quality of the kraft paper is affected, and the waste of starch adhesive is further reduced and the uniformity of adhesive coating on tinfoil paper is improved through adsorption and coating of the sponge cushion.

Optionally, the adjusting part sliding sleeve is located the adapter sleeve on the connecting pipe, the one end activity of shutoff piece outstanding in the connecting pipe is laid, the inner peripheral wall of adapter sleeve with the one end activity laminating that the shutoff piece is located the connecting pipe supports tightly, shutoff piece elasticity set up in the connecting pipe, the one end activity outstanding of adapter sleeve in the connecting pipe is laid, be equipped with on the inner peripheral wall of glue spreader and support tight piece, support tight piece with the adapter sleeve activity laminating supports tightly, just support tight piece with the one end that the adapter sleeve laminated mutually is the inclined plane form.

By adopting the technical scheme, when the glue spreader rotates, the inclined side of the abutting block is movably attached to and abutted against the end side of the connecting sleeve, so that the abutting connecting sleeve slides in the rotating process of the glue spreader, and the connecting sleeve slides on the connecting pipe;

When the glue spreader rotates to the position where the connecting pipe corresponds to the communication hole, the abutting block abuts against the connecting sleeve to slide upwards, at the moment, the connecting sleeve is separated from the blocking block, so that the blocking block is mutually far away under the elastic acting force of the resetting piece, the connecting pipe is opened, and at the moment, the starch adhesive drops to the communication hole from the connecting pipe under the action of gravity and smears the surface of the tinfoil paper through the sponge cushion.

When the glue spreader rotates to the state that the connecting pipe is staggered with the communicating hole, the abutting block is separated from the connecting sleeve, so that the connecting sleeve moves towards the direction away from the glue tank, and the connecting sleeve abuts against the plugging block at the moment, so that the plugging blocks are mutually close to each other and abut against, the connecting pipe is plugged, the leakage of the adhesive is reduced, and the periodical dripping coating of the adhesive is realized.

Optionally, the flattening roller that is located the top has seted up multiunit negative pressure hole, multiunit negative pressure hole is followed the circumference direction interval of flattening roller is evenly laid, be equipped with the negative pressure case in the flattening roller, be equipped with in the frame and be used for making negative pressure spare that produces negative pressure in the negative pressure case, be equipped with the negative pressure pipe on the negative pressure case, the negative pressure pipe corresponds with multiunit negative pressure Kong Zeyi, just be equipped with in the flattening roller and be used for making the negative pressure pipe with the switching piece that negative pressure Kong Zeyi corresponds.

Through adopting above-mentioned technical scheme, after carrying out the adhesive coating to the tinfoil, when carrying out the roll-in through two flattening rollers, negative casting die work, make negative pressure box in produce negative pressure, when flattening roller rotates through the switching piece that sets up, make negative pressure pipe and multiunit negative pressure Kong Zeyi correspond, make flattening roller and the negative pressure hole department of the laminating department mutually of kraft paper produce the negative pressure, the negative pressure through the negative pressure hole is with the moisture in the adhesive between kraft paper and the tinfoil suction, the coating and the adhesion of follow-up fluorescent brightening agent of being convenient for, because flattening roller cavity sets up, other negative pressure hole departments also can produce the negative pressure this moment, thereby the moisture in the transportation process that composite material carried out carries out is properly dry this moment, promote the stability in the transportation process, reduce the transportation tearing that the excessive moisture caused.

Meanwhile, negative pressure is arranged in the flattening roller, when kraft paper is cracked, the negative pressure piece sucks out the adhesive from the crack, so that the follow-up detection of the crack when the fluorescent brightening agent is colored is facilitated.

Optionally, the switching piece is including locating the switching board in the flattening roller, the switching board rotate set up in the flattening roller, the switching board is equipped with the multiunit, the multiunit the switching board is followed the inner peripheral wall interval of flattening roller lay, the negative pressure hole is located adjacent two sets of between the switching board, the switching board is right the negative pressure hole carries out movable shutoff, be equipped with on the negative pressure case and support tight pole, support tight pole with the movable laminating of switching board, the pivot department of switching board is equipped with the return piece, support tight pole slide set up in on the negative pressure case, still be equipped with on the negative pressure case right support tight pole and carry out sliding adjustment's slider.

Through adopting above-mentioned technical scheme, owing to the component and the thickness difference according to different kraft paper, the moisture content of starch binder that add is also inconsistent to the binder of different water contents at this moment, required negative pressure intensity is also inconsistent when the roll-in, when adjusting through the output of adjustment negative pressure piece, can influence final combined material's drying rate, in order not to change the negative pressure intensity when the roll-in under the whole drying rate prerequisite of combined material.

Through the switching board that sets up, when the nip roll rotates to the position that negative pressure pipe and negative pressure hole correspond, support tight pole and switching board and laminate mutually, because the switching board rotates and sets up in the nip roll, at nip roll pivoted in-process, support tight pole and lie in the switching board that is close to kraft paper surface in proper order laminate mutually, thereby drive the switching board and rotate, make the effective width in corresponding negative pressure hole change, the switching board rotation angle is bigger, the negative pressure of corresponding negative pressure hole department is less, and the negative pressure of corresponding remaining negative pressure hole department is bigger, thereby promote the drying efficiency to combined material when reducing the damage to kraft paper surface when adhesive moisture is more.

When the binder moisture is less, through adjusting the position of supporting the tight pole this moment to make the rotation angle of switchover plate diminish, thereby make this moment to kraft paper surface's negative pressure grow, promote the efficiency that moisture arrived the kraft paper surface, the negative pressure of remaining negative pressure hole department is less this moment, also can play to dry composite material.

Optionally, the slider including slide set up in on the negative pressure case with support the slip rack that tight pole is connected, it is connected with the sliding gear to rotate on the collecting box, the sliding gear with the slip rack meshes mutually, just still be equipped with in the frame with the pivot of sliding gear is fixed mutually rotates the handle.

Through adopting above-mentioned technical scheme, when the rotation angle of switching board under different humidity is adjusted to needs, the technician rotates the rotation handle this moment, drives sliding gear and rotates to drive sliding rack and go up and down, when sliding rack drives the butt pole and goes up and down, the butt length of butt pole and switching board is adjusted, thereby reaches the purpose of adjusting the rotation angle of switching board.

Optionally, one side of keeping away from on the paint pole the flattening roller is equipped with and scribbles the even board, scribble even board and the laminating mutually of kraft paper's surface, in the frame the bottom side rotation of paint pole is equipped with the tight pulley that supports, it locates to support the tight pulley scribble the bottom side of even board, just support tight pulley and the movable laminating of bottom side of tinfoil paper, still be equipped with on the paint pole right silicic acid brightening agent carries out periodic extruded coloring piece.

Through adopting above-mentioned technical scheme, the coating board of setting is scraped the surface of kraft paper after carrying out the coating of fluorescent brightening agent to kraft paper surface even, promotes the homogeneity of fluorescent brightening agent at the coating of kraft paper surface to make the colouring property and the color rendering property on kraft paper surface homogeneous, and because fluorescent brightening agent is water-soluble medicament, carry out periodic extrusion to fluorescent brightening agent through the colouring piece that sets up, thereby reduce the waste of fluorescent brightening agent and promote the homogeneity of kraft paper surface colouring.

Optionally, the coloring piece including slide set up in shutoff board on the coating pole, the shutoff board is right the coating hole carries out movable shutoff, the end side rotation of supporting the tight wheel is connected with the connecting rod, the connecting rod keep away from the one end of supporting the tight wheel with the shutoff board rotates to be connected.

Through adopting above-mentioned technical scheme, when supporting the tight wheel rotation and supporting tightly carrying composite material, drive the connecting rod and rotate, the connecting rod drives the shutoff board and slides to carry out intermittent type shutoff to the coating hole of coating pole, thereby realize the periodic blanking of fluorescent brightening agent.

In summary, the present application includes at least one of the following beneficial technical effects:

1. through the glue spreading roller, the extrusion piece and the plurality of groups of communication holes arranged on the glue spreading roller, when kraft paper and tinfoil paper are compounded, the extrusion piece periodically extrudes the adhesive from the communication holes, so that the coating of the adhesive on the surface of the tinfoil paper is realized, the waste of the adhesive is reduced, the coating time of the adhesive is conveniently adjusted according to the conveying period, and manual intervention is not required;

2. Through the flattening roller and the negative pressure holes arranged on the flattening roller, negative pressure is generated simultaneously when the composite material is rolled, and negative pressure adsorption is carried out on moisture in the adhesive, so that the moisture in the adhesive floats to the surface of kraft paper, and the subsequent attachment of fluorescent brightening agent and the detection of cracks are facilitated;

3. The sealing block arranged in the connecting pipe in a sliding manner, the connecting sleeve sleeved on the connecting pipe in a sliding manner and the abutting block arranged in the glue spreader are adopted, when the glue spreader rotates, the glue spreader drives the abutting block to periodically rotate, so that the connecting sleeve is periodically slidably adjusted, and stable coating of the tinfoil paper adhesive is realized.

Drawings

FIG. 1 is a schematic overall structure of an embodiment of the present application;

FIG. 2 is a schematic diagram of the connection structure of the applicator roll and the frame;

FIG. 3 is a schematic view of the connection structure of the flattening roller;

fig. 4 is a schematic view of the connection structure of the paint rod.

The reference numerals are 1, a frame, 11, an uncoiler, 12, kraft paper, 13, tinfoil, 14, a coiling machine, 2, a rolling assembly, 21, a flattening roller, 22, a rotating member, 23, a negative pressure hole, 24, a negative pressure pipe, 25, a switching member, 251, a switching plate, 252, a tightening rod, 253, a tightening torsion spring, 26, a negative pressure box, 27, a negative pressure member, 28, a sliding member, 281, a sliding rack, 282, a sliding gear, 283, a rotating handle, 3, a detecting assembly, 31, an optical pick-up member, 32, a marking member, 33, a driving member, 4, a coating assembly, 41, a coating rod, 411, a coating hole, 42, a coating box, 43, a glue roller, 431, a communication hole, 432, a glue box, 433, a sponge pad, 44, an extrusion member, 441, a connecting pipe 442, a blocking block, 443, a spring, 45, an adjusting member, 451, a connecting sleeve, 452, a tightening block, 46, a coating plate, 47, a tightening wheel, 48, a coloring member, 481, a blocking plate, a connecting rod.

Detailed Description

The application is described in further detail below with reference to fig. 1-4.

The embodiment of the application discloses a kraft paper-tinfoil paper composite material for packaging bags. Referring to fig. 1, a kraft paper-tinfoil paper composite material for packaging bags comprises a color developing layer, an adhesive layer, a kraft paper 12 layer and a tinfoil paper 13 layer which are sequentially arranged, wherein the color developing layer is formed by curing a zinc silicate fluorescent brightening agent, and the adhesive layer is formed by curing starch glue.

The application also discloses a production process of the kraft paper-tinfoil composite material for the packaging bag, which comprises the following steps:

S1, firstly, uncoiling and flattening a tinfoil paper 13 and kraft paper 12 layer, and coating starch glue on the surface of the tinfoil paper 13 through a compound device to uniformly coat the starch glue on the surface of the tinfoil paper 13 layer;

s2, synchronously coating the surface of the kraft paper 12 layer with a fluorescent agent through a compound device, uniformly coating the fluorescent agent on the surface of the kraft paper 12 layer, and improving the color development performance of the kraft paper 12 surface;

S3, extruding and compositing the kraft paper 12 layer and the tinfoil 13 layer through a compositing device to enable the kraft paper 12 layer and the tinfoil 13 layer to be glued and composited, and adsorbing and drying moisture on an adhesive layer between the kraft paper 12 layer and the tinfoil 13 layer through a compositing device to enable the kraft paper 12 layer and the tinfoil 13 layer to be rapidly composited and dried, so that a kraft paper 12-tinfoil 13 composite material is formed;

S4, detecting the surface of the kraft paper 12 layer-tinfoil 13 composite material through the composite equipment, judging whether the kraft paper 12 layer is damaged or not through the color reaction generated by the starch glue and the zinc silicate fluorescent brightening agent, marking the damaged position, shearing the damaged position, and reducing the sanitary problem generated by the chemical agent entering the packaging bag.

According to the process, the application further provides a composite device, which comprises a frame 1 for fixing the ground, wherein the frame 1 is horizontally arranged, the extending direction of the frame 1 is consistent with the conveying direction of kraft paper 12 and tinfoil 13, an uncoiler 11, a coating component 4 for carrying out adhesive coating and fluorescent brightening agent coating, a rolling component 2 for rolling and compositing the kraft paper 12 and the tinfoil 13, a detection component 3 for detecting cracks and a coiling machine 14 for coiling the finally formed composite material are arranged on the frame 1 at one time along the conveying direction, the uncoilers 11 are provided with two groups, the two groups of uncoilers 11 are oppositely arranged along the height direction, the uncoiler 11 on the top side is used for uncoiling the kraft paper 12, and the uncoiler 11 on the bottom side is used for uncoiling the tinfoil 13.

Referring to fig. 1 and 2, the coating assembly 4 includes a glue spreading roller 43 disposed on one side of the roll assembly 2 near the uncoiler 11 and a coating rod 41 disposed on one side of the coiling machine 14, the glue spreading roller 43 is disposed between the kraft paper 12 and the tinfoil 13, the glue spreading roller 43 is attached to the surface of the tinfoil 13, the glue spreading roller 43 is rotatably disposed on the frame 1, the glue spreading roller 43 is hollow, a glue tank 432 is disposed in the glue roller 43, a starch adhesive is stored in the glue tank 432, a communicating pipe is disposed at the bottom side of the glue tank 432, a plurality of groups of communicating holes 431 are disposed on the glue spreading roller 43, the plurality of groups of communicating holes 431 are uniformly disposed along the circumferential direction of the glue spreading roller 43 at intervals, a sponge pad 433 is coated on the peripheral wall of the glue spreading roller 43 to reduce scraping of the tinfoil 13 and promote uniformity of adhesive coating, and each group of communicating holes 431 includes a plurality of communicating holes 431 uniformly disposed along the axial direction of the glue spreading roller 43, the communicating pipes are also disposed in plurality of communicating pipes are in one-to-one correspondence with the plurality of communicating holes 431 in each group, and in order to periodically extrude the adhesive in the glue spreading roller 43 when the glue spreading roller 43 rotates.

Referring to fig. 1 and 2, the extruding member 44 includes the blocking blocks 442 slidably disposed on the communicating pipes, the sliding direction of the blocking blocks 442 is perpendicular to the length direction of the communicating pipes, two blocking blocks 442 are disposed on each communicating pipe, the two blocking blocks 442 are oppositely disposed, the two blocking blocks 442 are movably attached, and the blocking springs 443 are fixedly connected between the two blocking blocks 442.

Meanwhile, in order to realize sliding adjustment of the blocking block 442, the communicating pipe is provided with an adjusting piece 45, the adjusting piece 45 comprises a connecting sleeve 451 sleeved on the connecting pipe 441 in a sliding manner, one end of the blocking block 442 movably protrudes out of the connecting pipe 441 to be arranged, one end of the blocking block 442 movably located outside the connecting pipe 441 is arc-shaped, the inner peripheral wall of the connecting sleeve 451 is movably attached to the end side of the blocking block 442 to be tightly abutted, one end of the connecting sleeve 451 protrudes out of the connecting pipe 441 to be arranged, a plurality of groups of tight abutting blocks 452 are fixedly connected to the inner peripheral wall of the glue spreader 43, each group of tight abutting blocks 452 comprises a plurality of tight abutting blocks 452 in one-to-one correspondence with the communicating hole 431, the outer peripheral wall of each tight abutting block 452 is inclined, and the inclined side of the tight abutting block 452 is movably attached to the end side of the connecting sleeve 451 protruding out of the connecting pipe 441 to be tightly abutted.

When the glue spreader 43 rotates to the position of the connecting pipe 441 corresponding to the communication hole 431, the abutting block 452 abuts against the connecting sleeve 451 to slide upwards, at this time, the connecting sleeve 451 and the blocking block 442 are separated, so that the blocking block 442 is separated from each other under the elastic acting force of the resetting piece, the connecting pipe 441 is opened, at this time, the starch adhesive drops from the connecting pipe 441 to the communication hole 431 under the action of gravity, and the surface of the tinfoil paper 13 is smeared through the sponge cushion 433.

When the glue spreader 43 rotates until the connecting pipe 441 and the communicating hole 431 are staggered, the abutting block 452 is separated from the connecting sleeve 451, so that the connecting sleeve 451 moves towards a direction away from the glue tank 432, and at the moment, the connecting sleeve 451 abuts against the blocking blocks 442, so that the blocking blocks 442 are mutually close to each other to block the connecting pipe 441, so that leakage of adhesive is reduced, and periodical dripping and coating of the adhesive are realized.

Further, after the adhesive is coated, the kraft paper 12 and the tinfoil paper 13 need to be rolled and compounded at this time, referring to fig. 1 and 3, the rolling assembly 2 includes two flattening rollers 21 which are oppositely arranged along the height direction, a gap for the composite material to pass through is reserved between the two flattening rollers 21, a rotating member 22 for rotationally driving the flattening rollers 21 is arranged on the frame 1, the rotating member 22 is a rotating motor fixedly connected with the rotating shaft of one flattening roller 21, intermeshing rotating gears are arranged at the rotating shaft of the two flattening rollers 21, and for the subsequent coating of the fluorescent agent, a plurality of negative pressure holes 23 are formed in the flattening rollers 21, a plurality of negative pressure holes 23 are uniformly distributed along the circumference direction of the flattening rollers 21, the flattening rollers 21 are also hollow, a negative pressure box 26 is arranged in the flattening rollers 21, a negative pressure piece 27 for generating negative pressure in the negative pressure box 26 is arranged on the frame 1, a negative pressure tube 24 is fixedly connected to the upper bottom side of the negative pressure box 26, one negative pressure tube 24 is correspondingly arranged in the negative pressure box 24, and one negative pressure hole 23 is correspondingly arranged in the flattening roller 21, and one negative pressure tube 25 is correspondingly arranged in the flattening tube 25.

Referring to fig. 3, the switching member 25 includes a plurality of switching plates 251 rotatably connected to the inside of the top flattening roller 21, the switching plates 251 are provided with a plurality of groups, the rotation axes of the switching plates 251 are consistent with the rotation axes of the flattening roller 21, the plurality of groups of switching plates 251 are in one-to-one correspondence with the plurality of negative pressure holes 23, the negative pressure holes 23 are movably blocked by the switching plates 251, and a tightening rod 252 is slidably provided on the side wall of the negative pressure tank 26, and the end side of the tightening rod 252 is abutted against the switching plates 251.

In order to realize the coating drying of different moisture adhesives for different kraft papers 12, be equipped with in the nip roll 21 and carry out the slider 28 that slides and adjust to support tight pole 252, slider 28 is including sliding rack 281 that sets up on the negative pressure case 26 lateral wall, and sliding rack 281 is connected with support tight pole 252 looks fixed connection, rotates on the lateral wall of negative pressure case 26 and is connected with slide gear 282, and slide gear 282's pivot is unanimous with the pivot of nip roll 21, and slide gear 282 meshes with slide rack 281, rotates on frame 1 to be connected with slide gear 282 coaxial rotation handle 283.

When the flattening roller 21 rotates to the position of the negative pressure pipe 24 corresponding to the negative pressure hole 23, the abutting rod 252 is attached to the switching plate 251, and as the switching plate 251 is rotatably arranged in the flattening roller 21 and the abutting torsion spring 253 is fixedly connected to the rotating shaft of the switching plate 251, in the rotating process of the flattening roller 21, the abutting rod 252 is sequentially attached to the switching plate 251 positioned close to the surface of the kraft paper 12, so that the switching plate 251 is driven to rotate, the effective width of the corresponding negative pressure hole 23 is changed, the larger the rotating angle of the switching plate 251 is, the smaller the negative pressure at the corresponding negative pressure hole 23 is, and the larger the negative pressure at the corresponding left negative pressure hole 23 is, thereby reducing the damage to the surface of the kraft paper 12 when the adhesive is more in water and improving the drying efficiency of the composite material.

When the moisture content of the adhesive is small, the rotating angle of the switching plate 251 is reduced by adjusting the position of the abutting rod 252, so that the negative pressure on the surface of the kraft paper 12 is increased, the efficiency of moisture reaching the surface of the kraft paper 12 is improved, and the residual negative pressure at the negative pressure hole 23 is small, so that the drying of the composite material can be realized.

After the kraft paper 12 and the tinfoil paper 13 are compounded, at the moment, under the negative pressure effect of the flattening roller 21, moisture in the adhesive floats on the surface of the kraft paper 12 through the negative pressure effect, and at the moment, the fluorescent brightening agent is coated, so that the adhesiveness can be improved, the moisture content in the fluorescent brightening agent can be reduced, and the coloring performance of the surface of the kraft paper 12 can be improved. Therefore, the coating component 4 comprises a coating rod 41 fixed on the frame 1 and positioned on one side of the flattening roller 21 close to the wind-up roller, the bottom side of the coating rod 41 is provided with coating holes 411, the coating holes 411 are provided with a plurality of coating holes 411, the coating holes 411 are uniformly distributed along the length direction of the coating rod 41, the frame 1 is fixedly connected with a coating box 42 communicated with the coating holes 411, zinc silicate brightening agent is stored in the coating box 42, in order to uniformly coat the surface brightening agent of kraft paper 12, a coating plate 46 is fixedly connected on the frame 1 on one side of the coating rod 41 far away from the flattening roller 21, the bottom side of the coating plate 46 is rotationally connected with a supporting wheel 47, the supporting wheel 47 is oppositely distributed with the coating plate 46, the supporting wheel 47 is attached to the bottom side of the composite material, and the coating plate 46 is attached to the top side of the composite material.

Since the zinc silicate brightening agent is in a solution form, if the coating hole 411 is always opened, waste of the zinc silicate brightening agent is easily caused, in order to solve the problem, a coloring member 48 for periodically extruding the zinc silicate brightening agent is arranged on the coating stem, referring to fig. 3 and 4, the coloring member 48 comprises a blocking plate 481 which is slidably arranged in the coating stem 41, the blocking plate 481 movably blocks the coating hole 411, one side, far away from the axis center, of the end side of the tightening wheel 47 is rotationally connected with a connecting rod 482, the rotation axis of the connecting rod 482 is parallel to the rotation axis of the tightening wheel 47, one end, far away from the tightening wheel 47, of the connecting rod 482 is rotationally connected with the blocking plate 481, when the tightening wheel 47 rotates to tightly convey the composite material, the connecting rod 482 drives the blocking plate 481 to slide, thereby intermittently blocking the coating hole 411 of the coating stem 41, and periodically blanking the fluorescent brightening agent is realized.

Referring to fig. 1 and 4, the detecting assembly 3 includes an optical pick-up member 31 fixed on a frame 1, the optical pick-up member 31 is located between a coating rod 41 and a wind-up roller, the optical pick-up member 31 is arranged towards the surface of kraft paper 12, a marker 32 is slidably arranged on the frame 1, the marker 32 is in the form of a marker pen in the application, the sliding direction of the marker 32 is consistent with the height direction of the frame 1, a driving member 33 for driving the marker 32 to lift and slide is arranged on the frame 1, and the driving member 33 is an electric push rod electrically connected with the optical pick-up member 31 in the application.

The kraft paper-tinfoil composite material for packaging bags is implemented according to the principle that when the composite material is produced, a technician unwinds kraft paper 12 and tinfoil 13, then both kraft paper 12 and tinfoil 13 are conveyed between two flattening rollers 21, and starch adhesive in a glue box 432 is extruded into the flattening rollers 21 through an extrusion piece 44 and is extruded to the surface of the tinfoil 13 through a communication hole 431 in the conveying process.

Meanwhile, after the adhesive coating is finished on the surface of the tinfoil 13, the kraft paper 12 and the tinfoil 13 are subjected to composite rolling through the flattening roller 21 to form a kraft paper 12-tinfoil 13 composite material, after the rolling is finished, the fluorescent brightening agent is coated on the surface of the kraft paper 12 through the coating rod 41, and when the composite material is not dried completely, the fluorescent brightening agent is coated, so that drying steps in two processes of compounding and coloring agent coating are reduced.

After the tinfoil paper 13 is coated with the adhesive, when the tinfoil paper 13 is rolled by the two flattening rollers 21, the negative pressing piece 27 works to generate negative pressure in the negative pressure box 26, when the flattening rollers 21 rotate through the switching piece 25, the negative pressure pipe 24 is correspondingly selected from a plurality of groups of negative pressure holes 23, the negative pressure hole 23 at the joint of the flattening rollers 21 and the kraft paper 12 is generated, and the negative pressure of the negative pressure hole 23 sucks out the moisture in the adhesive between the kraft paper 12 and the tinfoil paper 13, so that the subsequent coating and adhesion of fluorescent brightening agent are facilitated.

When the propping wheel 47 rotates to tightly prop up and convey the composite material, the connecting rod 482 is driven to rotate, and the connecting rod 482 drives the plugging plate 481 to slide, so that the paint holes 411 of the paint rod 41 are intermittently plugged, and the periodic blanking of the fluorescent brightening agent is realized.

The above embodiments are not intended to limit the scope of the application, so that the equivalent changes of the structure, shape and principle of the application are covered by the scope of the application.

Claims

1. A production process of a kraft paper-tin foil composite material for packaging bags, used for producing a kraft paper-tin foil composite material for packaging bags, the composite material comprising a color development layer, a kraft paper (12) layer, an adhesive layer, a tin foil (13) layer, an adhesive layer and a kraft paper layer arranged in sequence, the color development layer being a color development layer formed after curing a zinc silicate fluorescent brightener, and the adhesive layer being an adhesive layer formed after curing a starch-based glue, characterized in that the production process comprises the following steps:

S1, firstly, unrolling and flattening the tin foil (13) and the kraft paper (12) layer, and coating the surface of the tin foil (13) with starch glue through a composite device, so that the starch glue is evenly coated on the surface of the tin foil (13);

S2, then, by means of a composite device, the surface of the kraft paper (12) layer is coated with a fluorescent brightener, and the fluorescent brightener is evenly applied to the surface of the kraft paper (12) layer to improve the color rendering performance of the surface of the kraft paper (12);

S3, extruding and laminating the kraft paper (12) layer and the tinfoil (13) layer through a laminating device, so that the kraft paper (12) layer and the tinfoil (13) layer are adhesively laminated, and the adhesive layer between the kraft paper (12) layer and the tinfoil (13) layer is adsorbed and dried through the laminating device, so as to achieve rapid lamination and drying of the kraft paper (12) layer and the tinfoil (13) layer, thereby forming a kraft paper (12)-tinfoil (13) composite material;

S4, using a composite device to detect the surface of the composite material of the kraft paper (12) layer and the tin foil paper (13), judging whether the kraft paper (12) layer is damaged by the color reaction produced by the starch glue and the zinc silicate fluorescent brightener, marking the damaged position, and subsequently cutting the damaged position to reduce the hygienic problems caused by the entry of chemical agents into the packaging bag;

S5, again coating the tin foil of the kraft paper layer-tin foil composite material formed in S4 with starch glue through the composite equipment, and composite the new kraft paper layer with one side of the tin foil layer to form a kraft paper-tin foil-kraft paper three-layer composite material.

2. The process for producing a kraft paper-tin foil composite material for packaging bags according to claim 1, characterized in that: the composite equipment in steps S1-S4 comprises a frame (1), a rolling assembly (2) arranged on the frame (1), a detection assembly (3) arranged on the frame (1), and a coating assembly (4) arranged on the frame (1);

The rolling assembly (2) comprises a flattening roller (21) rotatably arranged on the frame (1) and a rotating member (22) for driving the flattening roller (21) to rotate, wherein two flattening rollers (21) are provided, the two flattening rollers (21) are arranged opposite to each other, and a gap is left between the two flattening rollers (21) for the kraft paper (12) and the tin foil (13) to pass through;

The detection component (3) comprises an optical camera component (31) arranged on the frame (1), a marking component (32) movably arranged on the frame (1), and a driving component (33) for movably driving the marking component (32), and the optical camera component is electrically connected to the driving component (33);

The coating assembly (4) comprises a glue coating roller (43) arranged on the frame (1), a coating rod (41) arranged on the frame (1), and a rotating member (22) for rotating the glue coating roller (43), wherein the glue coating roller (43) is located on a side of the flattening roller (21) close to the input direction, the glue coating roller (43) extends into a gap between the kraft paper (12) and the tinfoil (13), the glue coating roller (43) is in contact with a side of the tinfoil (13) close to the kraft paper (12), the glue coating roller (43) is provided with a plurality of groups of connecting holes (431), the coating rod (41) is located on a side of the flattening roller (21) away from the input direction, and the coating rod (41) is provided with a plurality of connecting holes (431). A plurality of paint holes (411), wherein the plurality of paint holes (411) are arranged at intervals along the length direction of the paint rod (41); a paint box (42) is provided on the frame (1); a zinc silicate fluorescent brightener is stored in the paint box (42); the paint box (42) is connected to the paint rod (41); a glue box (432) is provided in the glue coating roller (43); a starch adhesive is stored in the glue box (432); the glue box (432) is fixed to the frame (1); the glue box (432) is connected to the paint rod (41); and an extrusion piece (44) for periodically extruding the adhesive in the glue box (432) is also provided in the glue coating roller (43).

3. A production process for a kraft paper-tin foil composite material for packaging bags according to claim 2, characterized in that: the extruded part (44) comprises a connecting pipe (441) arranged on the glue box (432) and a blocking block (442) slidably arranged on the connecting pipe (441), the connecting pipe (441) is connected to the glue box (432), the glue coating roller (43) is hollow, a plurality of groups of connecting holes (431) are evenly spaced along the circumference direction of the glue coating roller (43), the outer peripheral side of the glue coating roller (43) is covered with a sponge pad (433), the sea The cotton pad (433) is in contact with the surface of the tin foil (13); a sealing hole is provided on the outer peripheral wall of the connecting tube (441); the sealing block (442) is slidably arranged in the sealing hole; two sealing blocks (442) are provided, and the two sealing blocks (442) are arranged opposite to each other; the two sealing blocks (442) are movably in contact with each other on their sides; when the two sealing blocks (442) are in contact with each other, the connecting tube (441) is blocked by the sealing block (442); and an adjusting member (45) for slidingly adjusting the sealing block (442) is also provided in the glue coating roller (43).

4. A process for producing a kraft paper-tin foil composite material for packaging bags according to claim 3, characterized in that: the adjusting member (45) is slidably sleeved on the connecting sleeve (451) on the connecting tube (441), one end of the blocking block (442) is movably protruded from the connecting tube (441), the inner peripheral wall of the connecting sleeve (451) and the end of the blocking block (442) located on the connecting tube (441) are movably fitted and pressed together, the blocking block (442) is elastically arranged in the connecting tube (441), one end of the connecting sleeve (451) is movably protruded from the connecting tube (441), a pressing block (452) is provided on the inner peripheral wall of the glue coating roller (43), the pressing block (452) and the connecting sleeve (451) are movably fitted and pressed together, and the end of the pressing block (452) that is in contact with the connecting sleeve (451) is in an inclined shape.

5. A process for producing a kraft paper-tin foil composite material for packaging bags according to claim 4, characterized in that: a plurality of groups of negative pressure holes (23) are provided on the flattening roller (21) located on the top side, and the plurality of groups of negative pressure holes (23) are evenly spaced along the circumference direction of the flattening roller (21); a negative pressure box (26) is provided in the flattening roller (21); a negative pressure member (27) for generating negative pressure in the negative pressure box (26) is provided on the frame (1); a negative pressure tube (24) is provided on the negative pressure box (26), and the negative pressure tube (24) corresponds to one of the plurality of groups of negative pressure holes (23); and a switching member (25) for causing the negative pressure tube (24) to correspond to one of the negative pressure holes (23) is provided in the flattening roller (21).

6. A process for producing a kraft paper-tin foil composite material for packaging bags according to claim 5, characterized in that: the switching member (25) comprises a switching plate (251) arranged in the flattening roller (21), the switching plate (251) is rotatably arranged in the flattening roller (21), a plurality of groups of the switching plates (251) are provided, the plurality of groups of the switching plates (251) are arranged at intervals along the inner peripheral wall of the flattening roller (21), and the negative pressure holes (23) are located between two adjacent groups of the switching plates (251), the switching plate (251) movably blocks the negative pressure hole (23), the negative pressure box (26) is provided with a clamping rod (252), the clamping rod (252) and the switching plate (251) are movably fitted, a return member is provided at the rotating shaft of the switching plate (251), the clamping rod (252) is slidably arranged on the negative pressure box (26), and the negative pressure box (26) is also provided with a sliding member (28) for slidingly adjusting the clamping rod (252).

7. A process for producing a kraft paper-tin foil composite material for packaging bags according to claim 6, characterized in that: the sliding member (28) includes a sliding rack (281) slidably arranged on the negative pressure box (26) and connected to the clamping rod (252), a sliding gear (282) is rotatably connected to the negative pressure box (26), the sliding gear (282) is meshed with the sliding rack (281), and the frame (1) is also provided with a rotating handle (283) fixed to the rotating shaft of the sliding gear (282).

8. A process for producing a kraft paper-tin foil composite material for packaging bags according to claim 7, characterized in that: a coating rod (41) is provided with a coating plate (46) on the side away from the flattening roller (21), and the coating plate (46) is in contact with the surface of the kraft paper (12); a clamping wheel (47) is rotatably provided on the bottom side of the coating rod (41) on the frame (1), and the clamping wheel (47) is provided on the bottom side of the coating plate (46), and the clamping wheel (47) is movably in contact with the bottom side of the tin foil (13); and a coloring member (48) for periodically extruding the zinc silicate fluorescent brightener is also provided on the coating rod (41).

9. A process for producing a kraft paper-tin foil composite material for packaging bags according to claim 8, characterized in that: the coloring part (48) includes a sealing plate (481) slidably arranged on the coating rod (41), the sealing plate (481) movably seals the coating hole (411), the end side of the clamping wheel (47) is rotatably connected to a connecting rod (482), and the end of the connecting rod (482) away from the clamping wheel (47) is rotatably connected to the sealing plate (481).