CN112455008A

CN112455008A - Manufacturing method of straw and straw

Info

Publication number: CN112455008A
Application number: CN202011165726.2A
Authority: CN
Inventors: 吕晓军; 刘华文
Original assignee: Lamican Packaging Kunshan Co ltd
Current assignee: Lamican Packaging Kunshan Co ltd
Priority date: 2020-10-27
Filing date: 2020-10-27
Publication date: 2021-03-09
Anticipated expiration: 2040-10-27
Also published as: CN112455008B

Abstract

The application provides a manufacturing method of a straw and the straw, wherein the manufacturing method of the straw comprises the following steps: providing a plurality of continuous paper layers; the paper layers are partially overlapped in the width direction to form a paper blank; spirally rolling the paper blank to form a hollow paper tube; the hollow paper tube is cut off according to a preset length to obtain the straw. The manufacturing method of the straw is formed by laminating a plurality of continuous paper layers, and the paper layers are more easily rotten and degraded compared with plastic, so that the straw made of plastic can be effectively prevented from causing great pollution to the environment; and the paper layer is adopted to make the straw, and then the straw can be recycled to make paper pulp again for recycling, and the paper layer recycling technology and equipment are mature, so that the corresponding recycling treatment cost is lower.

Description

Manufacturing method of straw and straw

Technical Field

The application relates to the technical field of beverage straws, in particular to a method for manufacturing a straw and the straw.

Background

Nowadays, packaged beverages and field-prepared beverages become very popular, and most of disposable food and beverage straws matched with the packaged beverages are plastic straws.

Although each plastic straw is small in volume, the total amount of plastic straws consumed every day in the world is extremely remarkable, so that a large amount of plastic wastes cause great pollution to the environment due to the difficulty in handling after recycling.

Disclosure of Invention

The application provides a manufacturing method of a straw and the straw, which aim to solve the problem that the existing straw is usually a plastic straw, so that the environment is greatly polluted due to difficult treatment after recovery.

In order to solve the technical problem, the present application provides a method for manufacturing a straw, wherein the method for manufacturing the straw comprises: s1, providing a plurality of continuous paper layers; s2, overlapping the paper layers in the width direction to form a paper blank; s3, spirally rolling the paper blank to form a hollow paper tube; and S4, cutting the hollow paper tube according to a preset length to obtain the straw.

In S2, the overlapping portion of every two adjacent paper layers in the width direction occupies one half of the paper layer located inside the straw.

In S2, the overlapping portions of two adjacent paper layers are bonded to each other.

Wherein S3 includes: the paper blank is spirally wound on the rotating shaft; the rotating shaft rotates around the central axis of the rotating shaft, and the paper blank moves linearly along the central axis of the rotating shaft to form the hollow straw.

Wherein, the paper blank starts to be spirally wound on the rotating shaft from the crossed angle of the length direction and the width direction of the paper blank.

In S1, each paper layer is transferred by the transfer roller in a tensioned state.

Wherein S4 includes: cutting the hollow paper tube according to a preset length; and embossing and bending the cut hollow paper tube.

In S1, the plurality of continuous paper layers include a first paper layer, a second paper layer, and a third paper layer; in S2: one side edge of the second paper layer is arranged opposite to the central line of the first paper layer and is laminated with the first paper layer, and one side edge of the third paper layer is arranged opposite to the central line of the second paper layer and is laminated with the second paper layer, so that a paper blank is formed.

In order to solve the above technical problem, the present application adopts another technical solution: a suction pipe is provided, which comprises a side wall, wherein the side wall is formed by paper boards, the paper boards comprise a plurality of paper layers which are laminated, and the paper layers are partially overlapped along the width direction.

The paper layers are a first paper layer, a second paper layer and a third paper layer, one side edge of the second paper layer is arranged opposite to the central line of the first paper layer and is overlapped with the first paper layer, and one side edge of the third paper layer is arranged opposite to the central line of the second paper layer and is overlapped with the second paper layer.

Wherein the width of the first paper layer is 8-20mm, and/or the width of the second paper layer is 7-18mm, and/or the width of the third paper layer is 5-15 mm.

Wherein the grammage of each of the plurality of paper layers is 50g/m²-150g/m²。

Wherein the tensile strength of each of the plurality of paper layers is not less than 5kN/m, and/or the elongation at break of each of the plurality of paper layers is not less than 5%.

Wherein the tensile strength of each paper layer in the length direction is not less than 7kN/m, and the tensile strength of each paper layer in the width direction is not less than 5 kN/m.

Wherein the elongation at break of each paper layer in the length direction is not less than 5%, and the elongation at break of each paper layer in the width direction is not less than 7%.

Wherein each of the plurality of paper layers has a paperboard surface water absorption value of no greater than 30 g/m.

The side wall of the straw is further provided with a groove embossing at the position 1/4-1/2, the distance between the side wall of the straw and one end of the straw is the length of the straw, and the groove embossing comprises a plurality of grooves which are arranged in parallel.

Wherein, the length of the groove embossing along the extending direction of the straw is 0.5cm-5cm, and the depth of each groove is 0.1mm-5 mm.

The beneficial effect of this application is: different from the prior art, the manufacturing method of the straw provided by the application comprises the following steps: providing a plurality of continuous paper layers, partially overlapping the paper layers in the width direction to form a paper blank, further spirally rolling the paper blank to form a hollow paper tube, and cutting the hollow paper tube according to a preset length to obtain the straw. The manufacturing method of the straw is formed by laminating a plurality of continuous paper layers, and the paper layers are more easily rotten and degraded compared with plastic, so that the straw made of plastic can be effectively prevented from causing great pollution to the environment; and the paper layer is adopted to make the straw, and then the straw can be recycled to make paper pulp again for recycling, and the paper layer recycling technology and equipment are mature, so that the corresponding recycling treatment cost is lower.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic flow chart of a first embodiment of a method for making a drinking straw according to the present application;

FIG. 2 is a schematic diagram corresponding to steps S1-S3 in FIG. 1;

FIG. 3 is a schematic view of the embryonic web of FIG. 1;

FIG. 4 is a schematic view of the hollow paper tube of FIG. 1;

FIG. 5 is a schematic view of the embossment of FIG. 1;

FIG. 6 is a schematic structural view of a first embodiment of the pipette of the present application;

FIG. 7 is a schematic view of the folded structure of FIG. 6;

fig. 8 is a schematic view of the structure of the paperboard enclosing the side wall of fig. 6.

Detailed Description

The present application will be described in further detail with reference to the following drawings and examples. It is to be noted that the following examples are only illustrative of the present application, and do not limit the scope of the present application. Likewise, the following examples are only some examples and not all examples of the present application, and all other examples obtained by a person of ordinary skill in the art without any inventive step are within the scope of the present application.

The terms "first", "second" and "third" in this application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any indication of the number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of the feature. In the description of the present application, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specifically limited otherwise. All directional indications (such as up, down, left, right, front, and rear … …) in the embodiments of the present application are only used to explain the relative positional relationship between the components, the movement, and the like in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indication is changed accordingly. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

The present application will be described in detail with reference to the accompanying drawings and examples.

Referring to fig. 1 to 5, fig. 1 is a schematic flow chart of a first embodiment of a method for manufacturing a straw according to the present application, fig. 2 is a schematic view corresponding to steps S1-S3 in fig. 1, fig. 3 is a schematic view corresponding to a blank in fig. 1, fig. 4 is a schematic view of a hollow paper tube in fig. 1, and fig. 5 is a schematic view of embossing in fig. 1. In a first aspect of the present application, a method for manufacturing a straw is provided, which includes:

s1: a plurality of continuous paper plies is provided.

Specifically, referring to fig. 2 in combination, a plurality of logs of virgin wood pulp made of different materials or the same material are first provided to sequentially dispense a plurality of continuous paper layers after being cut by a slitter into a plurality of continuous paper layers of a desired width suitable for forming a corresponding straw, respectively.

After a plurality of continuous paper layers are distributed, each paper layer can be continuously tensioned by a corresponding plurality of conveying rollers and/or rollers to be conveyed to a set position.

For example, in some embodiments, the number of continuous paper layers is 3. That is, first, 3 rolls of paper of a suitable width are provided to dispense 3 continuous plies of paper from respective transport rollers and/or rollers, and the parameters of material composition, width, etc. of the 3 continuous plies may be the same or different as desired. After that, it is transmitted to a set position in a tensioned state. It is understood that in other embodiments, the number of the continuous paper layers may be any reasonable number such as 2 or 5, which is not limited in the present application.

S2: the paper layers are partially overlapped in the width direction to form a paper blank.

The purpose of the partial overlapping of the paper layers is to connect the paper layers to each other to form a whole. Therefore, the size parameters of the overlapped part and the like can be selected according to the requirement so as to meet the requirement that the paper layers are connected stably and cannot be separated from each other. In a specific embodiment, every two adjacent paper layers of the plurality of paper layers overlap in the width direction by half of the paper layer located toward the inner side of the straw. It will be appreciated that in other embodiments, the overlapping portion of each adjacent two of the plurality of paper layers in the width direction may also be a third or a fourth of the paper layers located on the inner side of the straw, as desired, and the present application is not limited thereto.

S3: the paper blank is spirally rolled to form a hollow paper tube.

That is, the paper blank is spirally wound on a rotating shaft, and the rotating shaft rotates around the central axis of the rotating shaft and moves linearly with the paper blank along the central axis of the rotating shaft, so as to form a hollow suction pipe continuously extending towards the central axis of the rotating shaft.

In a specific embodiment, after the paper blank is obtained, the paper blank is first spirally wound on a rotating shaft from an angle at which the length direction and the width direction of the paper blank are crossed, and the rotating shaft is driven to rotate by a power device and is driven to linearly move along the central axis direction of the rotating shaft, so as to form a hollow suction pipe which continuously extends towards the central axis direction of the rotating shaft.

S4: the hollow paper tube is cut off according to a preset length to obtain the straw.

And cutting the hollow paper tube according to a preset length as required to obtain the straw.

In a particular embodiment, at the latter station of the tube-making machine, the hollow paper tube is cut by a preset cutter according to the desired length to obtain the final finished straw. Wherein, when cutting for reducing, the cutter jump sword, cavity paper tube do not cut off completely, the paper limit that surely goes out is coarse, the appearance of many scheduling problems of paper powder, should rationally set up the position of this cutter relative this cavity paper tube, angle and cavity paper tube position in the cutting machine, and when the cutting machine operation, still need regularly observe this cavity paper tube cut the state to when observing present cutting problem, can in time shut down.

The manufacturing method of the straw is characterized in that a plurality of continuous paper layers are provided, namely the straw is made of the paper layers, and the paper layers are more easily decomposed and degraded compared with plastic, so that the straw made of the plastic can be effectively prevented from causing great pollution to the environment; and the paper layer is adopted to make the straw, and then the straw can be recycled to make paper pulp again for recycling, and the paper layer recycling technology and equipment are mature, so that the corresponding recycling treatment cost is lower.

Further, in some embodiments, in order to prevent the overlapping portions of the paper layers from being delaminated or even separated to affect the quality of the straw, the overlapping portions of every two adjacent paper layers in the plurality of paper layers are adhered to each other in S2. For example, the overlapped parts of every two adjacent paper layers are mutually bonded by any reasonable glue such as white latex or white mineral oil meeting the viscosity requirement, and the corresponding gluing amount is well controlled, so that the condition that the glue is exposed due to glue overflow and the health of the paper tube are influenced is avoided.

In some embodiments, the strength of each of the plurality of paper layers is required to meet a predetermined requirement in order to prevent the paper layers from being damaged during the spiral winding. Specifically, the tensile strength of each paper layer is not less than 5kN/m, or the elongation at break of each paper layer is not less than 5%. It is understood that, for the sake of strength, it may be: the tensile strength of each paper layer is not less than 5kN/m, and the elongation at break of each paper layer is not less than 5%.

According to the stress analysis, in the actual process of spirally winding, since the stress of the paper layers in the length direction and the width direction is not completely the same, optionally, in some more specific embodiments, the tensile strength of each paper layer in the length direction is not less than 7kN/m, and the tensile strength of each paper layer in the width direction is not less than 5 kN/m. The elongation at break of each paper layer in the length direction is not less than 5%, and the elongation at break of each paper layer in the width direction is not less than 7%. It can be understood that, according to the requirement, each paper layer can only meet the requirements of tensile strength or breaking elongation in the length direction and the width direction; however, in some cases where a large strength is required, each of the paper layers needs to satisfy the requirements of tensile strength and elongation at break in both the longitudinal direction and the width direction.

Since the straw is used in the context of some applications for sucking up liquid beverages and the like. Thus, in order to avoid the lifetime of the straw being too long to soften upon absorption of water and thereby prevent further use, in some embodiments, the paperboard surface water absorption value (water absorption Cobb value) of each of the plurality of paper layers is not greater than 30g/m and the maximum relative wet strength (in the length direction) is not less than 20%.

Therefore, the suction pipe made of the paper blank formed by laminating the paper layers meeting the preset requirements can effectively meet the product requirements of tensile strength, fracture resistance, leakage resistance and soaked strength.

In order to meet the diversity of the straws or for different application scenarios of the straws, in other specific embodiments, after the hollow paper tube is cut according to a preset length to obtain the corresponding straw, that is, after step S4, the method further includes: and embossing and bending the cut straw. Specifically, as shown in fig. 5, a specific method of embossing the cut straw includes: the cut straw is wound on a rotating shaft with a set thread pattern, a bending machine is arranged at intervals in the vertical direction of the position where the thread is arranged on the rotating shaft, at least one thimble is further arranged on the bending machine, so that when the hollow paper tube does linear motion along the axis direction of the central shaft of the rotating shaft, the thimble can enable the corresponding part of the structure of the straw to be abutted against the thread of the rotating shaft and slowly move along the thread, corresponding groove embossing is pressed on the straw, the deformation is improved, the straw is convenient to bend or stretch along the groove, straws in different shapes are obtained, and different scene requirements are met. Optionally, the groove embossing comprises a plurality of grooves arranged in parallel at equal intervals.

It will be understood that the length of the groove embossments, and the depth of each groove therein, are determined by the length and depth of the thread on the corresponding rotating shaft, and that after the groove embossments forming the groove pattern are formed on the corresponding straw, the straw can be stretched or compressed at the positions corresponding to the embossed grooves.

Specifically, the specific method for embossing the cut straw comprises the following steps: and bending the cut hollow paper tube at the position where the embossing is formed by a bending machine to obtain the final finished straw.

The straw can be prevented from going moldy and affecting sanitation and health in subsequent transportation and storage. In some specific embodiments, after the straw is cut or bent, it is further dried, for example, the cut hollow paper tube is dried by a dryer, or naturally dried by spreading and airing, so as to remove the moisture in the corresponding straw, and prevent the straw from having insufficient strength due to too high humidity, which cannot meet the strength requirement in normal use. It is understood that the drying process may be performed after the straw is cut off or after the straw is bent; between the above steps S3 and S4; alternatively, the straw may be cut and bent.

In order to make it more convenient and labor-saving to insert the straw into the sealing cover or the sealing film, in another specific embodiment, after embossing the cut hollow paper tube and before bending it, the straw further comprises: and cutting one end of the embossed hollow paper tube through a corresponding cutter again so as to cut one end of the corresponding straw into a wedge-shaped notch.

Finally, in some embodiments, the straw is packaged for hygiene during shipping and storage. Such as: the straw is sealed by upper and lower layers of transparent plastic films. For another example: the straw was encapsulated with kraft paper.

In order to more clearly describe the manufacturing method of the straw, in a specific embodiment, please refer to fig. 2 to 4, which take the number of the continuous paper layers as 3 as an example, for detailed description.

First 3 rolls of suitable width are provided. Specifically, the 3 continuous paper layers are a first paper layer 21, a second paper layer 22 and a third paper layer 23. The centers of three paper rolls corresponding to the first paper layer 21, the second paper layer 22 and the third paper layer 23 are respectively arranged on corresponding paper material supports of the tube making machine, the corresponding paper rolls can be kept to flexibly rotate on the paper material supports, then the first paper layer 21, the second paper layer 22 and the third paper layer 23 are stretched and spread along corresponding tracks, and all layers of paper materials are conveyed and leveled to the same plane along a rolling shaft on the tube making machine. In the whole process, the parts of each paper layer which need to be overlapped are glued, for example, white latex, white mineral oil and the like are selected for gluing so that the overlapped parts of the paper layers can not be layered and even fall off to influence the quality of the finished product straw, and the corresponding gluing amount needs to be controlled so as to avoid glue exposure caused by glue overflow and influence on the health of the paper tube.

The third paper layer 23, the second paper layer 22 and the first paper layer 21 are sequentially staggered from inside to outside, stacked and bonded in parallel, and then spirally wound on corresponding rotating shafts.

Specifically, one side of the second paper layer 22 is arranged opposite to the center line of the first paper layer 21 and is stacked with the first paper layer 21, and one side of the third paper layer 23 is arranged opposite to the center line of the second paper layer 22 and is stacked with the second paper layer 22, so as to form a paper blank. In the process of rotating the rotating shaft, referring to fig. 2, the paper blank formed by laminating the first paper layer 21, the second paper layer 22 and the third paper layer 23 is spirally wound on a rotating shaft, and the rotating shaft is driven by a corresponding power device to rotate around the central axis thereof, and further the rotating shaft and the paper blank are driven to linearly move along the central axis direction of the rotating shaft, so as to form a hollow straw which continuously extends towards the central axis direction of the rotating shaft. And in the rear working section of the tube making machine, the preset cutter cuts the straw according to the required length of the straw.

Because of the change of indoor temperature and humidity, the degumming phenomenon between each layer of paper materials may occur during gluing, so that the glue meeting the viscosity requirement needs to be replaced in time and the corresponding gluing amount needs to be controlled. When cutting off the hollow paper tube on the tuber simultaneously, this hollow paper tube one end should be the parallel and level incision, and its other end is the wedge incision, and when detecting that there is incision deckle edge, can't cut off, incision unevenness, paper straw is blockked up the flaw and produces, the position and the angle that the corresponding cutter of operator can be adjusted according to actual conditions to select the straw that appears the flaw and do useless the processing. Meanwhile, attention needs to be paid to whether the outermost paper layers, namely the first paper layer 21 is overlapped and whether a gap exists between the third paper layer 23 and the second paper layer 22, and if the phenomenon exists, machine adjustment needs to be carried out in time.

Wherein, after cutting off the hollow paper tube, still need through the drying-machine stoving, perhaps through tiling sunning natural air drying, get rid of the moisture in the straw to satisfy the intensity requirement when the straw is normally used.

The rotary shaft is fixedly connected to a bending machine, threads in a set pattern are arranged on the rotary shaft, the rotary shaft and the center part of the corresponding embossing module are arranged in parallel at intervals, and the gap distance between the rotary shaft and the embossing module is slightly larger than the thickness of the hollow paper tube, for example, the gap is 0.5mm-10 mm. After the center of the hollow paper tube is sleeved into the rotating shaft, the position of the rotating shaft can be adjusted to enable the hollow paper tube to be located between the embossing module and the rotating shaft and to rotate together with the rotating shaft.

The bending machine is further provided with one or more ejector pins which are correspondingly arranged above the threads of the rotating shaft at intervals, so that in the process that the bending machine drives the hollow paper tube to move forwards, the ejector pins can slowly press the grooves with certain lengths in the extending direction of the hollow paper tube on the hollow paper tube along the threads.

The thimble can press a plurality of grooves which are distributed equidistantly along the thread of the rotating shaft, and the length of the groove embossing and the depth of each groove are determined by the length and the depth of the thread on the rotating shaft.

Alternatively, the groove embossings are correspondingly arranged on the side wall of the straw at a distance from one end of the straw of 1/4-1/2 of the length of the straw, and the total length of the groove embossings in the extension direction of the straw is 0.5cm-5cm, preferably 2cm-3cm, and each of the grooves has a depth of 0.1mm-5mm, preferably 0.2mm-1 mm.

Furthermore, according to the length required by the two sides of the bent straw when the straw is actually used, the corresponding bending position, namely the position of the groove embossing is determined, and the hollow paper tube with the pressed groove is bent at the position.

And checking whether the bent straw has normal color and luster, and whether stains, stains and peculiar smell exist, so as to ensure that the finished straw can meet the product requirements of smooth outer wall, flat notch, no defects such as burrs, breakage, fold lines and depressions. And each layer of paper material of the straw is flat and firm in adhesion, has no folds and layering, and can not be degummed for a long time after being soaked in water.

Furthermore, the straw after the embossing and bending is dried by the dryer again, or naturally air-dried by tiling and airing, so that the moisture in the straw is removed, and the strength requirement of the straw in normal use is met.

And further, packaging the bent straw by using upper and lower layers of transparent plastic films, keeping the widths of the upper and lower films consistent, sealing the films by adopting high temperature, and cooling to seal corresponding seals. The corresponding sealing temperature may be 130 ℃ to 140 ℃, preferably 136 ℃ to 139 ℃.

Wherein, due to the requirement of environmental protection, kraft paper can also be adopted to replace plastic film to seal the paper straw. And still need to pay attention to the conveyer belt when the conveying straw during the encapsulation, whether this straw has the separating groove, whether the straw after the encapsulation keeps sealed to and scald the interface and whether easily break, and when using, the packaging film need tear easily and conveniently take.

After packaging, packaging indentation of the single packaged straw is clear, the cut is smooth and has no cracking, pressing and damaging phenomena, and the single packaged straw is neat in appearance and has no defects of burrs, stains, color spots, foreign matters and the like.

In order to ensure that the phenomena of degumming, paper material layering and the like do not occur after the final finished product of the straw is contacted with liquid food for a long time, sampling and water soaking tests are carried out on straws produced in each batch, the water temperature is controlled to be 65-80 ℃, the sampled straws are soaked in water, the straws are taken out after 2 hours, the appearance of the straws is detected, whether the phenomena of degumming, paper material layering, excessive softening of the paper straws and the like occur or not, and if the phenomena do not occur, the straws are qualified products. The straws manufactured according to the method of the present embodiment were randomly sampled and tested, the specific sampling scheme was as follows:

batch size	Number of samples	Number of pass determination	Number of unqualified judgment
				26～50	5	5	0
51～90	8	8	0
				91～150	12	12	0
151～280	20	20	0
				281～500	32	32	0
501～1200	50	50	0
				1201～3200	80	79	1
3201～10000	120	119	1
				10001～35000	200	198	2
＞35000	300	296	4
				Total up to	827	819	8

From the above test results, it can be seen that: the straw manufactured by the method of the specific embodiment has no degumming and softening conditions, and has good use experience.

In a second aspect of the present application, a straw is further provided, please refer to fig. 6-8, in which fig. 6 is a schematic structural view of a first embodiment of the straw of the present application, fig. 7 is a schematic structural view of fig. 6 after being bent, and fig. 8 is a schematic structural view of a paperboard enclosing the side wall of fig. 6. In this embodiment, the suction pipe 6 comprises a side wall, and the side wall is surrounded by a cardboard sheet 61.

The cardboard 61 is formed by laminating a plurality of paper layers, and the paper layers are partially overlapped in the width direction. The purpose of the partial overlapping of the paper layers is to connect the paper layers to each other to form a whole. Therefore, the size parameters of the overlapped part and the like can be selected according to the requirement so as to meet the requirement that the paper layers are connected stably and cannot be separated from each other.

Alternatively, every two adjacent paper layers in the cardboard 61 overlap by half in the width direction of the paper layer located toward the inside of the straw 6. In other embodiments, the overlapping portion of every two adjacent paper layers in the paper board 61 in the width direction may also be any reasonable ratio of one third or one fourth of the paper layers located inside the straw, which is not limited in this application.

Alternatively, each of the plurality of plies of paperboard 61 may have a grammage of 50g/m²-150g/m²Preferably 70g/m²-120g/m²。

Alternatively, in order to satisfy the condition that the plurality of paper layers are not damaged in the spiral winding to form the paperboard 61, the tensile strength of each of the plurality of paper layers is not less than 5kN/m, and/or the elongation at break of each of the plurality of paper layers is not less than 5%.

According to the stress analysis, in the actual process of spiral winding, because the stress of the paper layers in the length direction and the width direction is not completely the same, optionally, in some more specific embodiments, the tensile strength of each paper layer in the length direction is not less than 7kN/m, and the tensile strength of each paper layer in the width direction is not less than 5 kN/m. And the elongation at break of each paper layer in the plurality of paper layers in the length direction is not less than 5%, and the elongation at break of each paper layer in the width direction is not less than 7%. It is understood that each of the above paper layers may satisfy only tensile strength or elongation at break in the length direction and the width direction, as required; however, in some cases where a large strength is required, each of the paper layers needs to have tensile strength and elongation at break in both the longitudinal direction and the width direction.

Alternatively, the straw 6 is used for sucking liquid beverage and the like in the context of some applications. Thus, in order to avoid the useful life of the straw 6 being such that it softens on absorption of water and is therefore not suitable for further use, in some embodiments each of the plurality of paper plies has a paperboard surface water absorption value (water absorption Cobb value) of no greater than 30g/m and a maximum relative wet strength (in the length direction) of no less than 20%.

Therefore, the suction pipe surrounded by the paper boards 61 formed by laminating the paper layers can effectively meet the product requirements of tensile resistance, fracture resistance, leakage resistance and strength after being soaked.

Optionally, the side wall of the straw 6 is further provided with a groove embossing 62 at a position 1/4-1/2, where the distance from one end of the straw 6 to the side wall is the length of the straw 6, and the groove embossing 62 includes a plurality of grooves arranged in parallel, so as to increase the deformation amount, and facilitate bending or stretching the straw 6 along the groove embossing 62, so as to obtain straws 6 of different shapes, and meet different scene requirements. Wherein the length of the groove embossings 62 in the direction of extension of the drinking straw 6 is between 0.5cm and 5cm, and wherein the depth of each groove is between 0.1mm and 5 mm.

Alternatively, as shown in fig. 7, the straw 6 may be bent at a corresponding position where the groove embossings 62 are provided, and since the straw 6 needs to pierce the sealing cover or membrane containing the beverage to protrude into the container, in order to make it more convenient and labor-saving to insert the straw 6 into the sealing cover or membrane, in another specific embodiment, one end of the straw 6 may be a wedge-shaped cut.

In one embodiment, as shown in fig. 8, the paperboard 61 includes a first paper layer 611, a second paper layer 612 and a third paper layer 613, wherein one side of the second paper layer 612 is overlapped with the first paper layer 611 opposite to the center line of the first paper layer 611, and one side of the third paper layer 613 is overlapped with the second paper layer 612 opposite to the center line of the second paper layer 612. In other embodiments, the paper sheet 61 may further include any reasonable number of paper layers, such as 2 or 4, for being partially overlapped along the width direction, which is not limited in the present application.

It will be understood that the first paper layer 611 corresponds to the outermost layer far from the straw 6, the second paper layer 612 corresponds to the middle layer of the straw 6, the third paper layer 613 corresponds to the inner layer toward the inside of the straw 6, and after the three paper layers are spirally stacked to form a straight straw 6, the outer paper layer, i.e. the first paper layer 611, is the portion directly contacted with the outside of the straw 6, i.e. the portion directly contacted with the liquid such as the sucked liquid beverage or milk, is the inner layer, i.e. the third paper layer 613, and the middle layer, i.e. the second paper layer 612, is completely covered by the outer layer and the inner layer.

In another embodiment, in order to prevent the overlapped portions of the paper layers from delaminating and even falling off to affect the quality of the straw 6, the first paper layer 611, the second paper layer 612 and the third paper layer 613 are adhered together by using glue, and the glue can be white latex or white mineral oil, so as to avoid glue overflow and glue exposure by reasonably controlling the temperature, humidity and gluing amount in the gluing chamber of the corresponding machine, thereby affecting the hygienic health of the paper tube.

Optionally, the width of the first paper layer 611 is 8-20mm, preferably 10-15 mm.

Optionally, the width of the second paper layer 612 is 7-18mm, preferably 9-14 mm.

Optionally, the width of the third paper layer 613 is 5-15mm, preferably 8-13 mm.

Alternatively, the width of the first paper layer 611 is 0.5-2mm larger than that of the second paper layer 612, and the width of the second paper layer 612 is 0.5-2mm larger than that of the third paper layer 613, so as to ensure that after the first paper layer 611, the second paper layer 612 and the third paper layer 613 are spirally laminated to form the corresponding straw 6, the portion of the outer side of the straw 6 which can directly contact with external substances is the first paper layer 611, and the portion of the inner side of the straw 6 which contacts with sucked liquid beverage or milk and the like is the third paper layer 613, and the second paper layer 612 is completely covered by the first paper layer 611 and the third paper layer 613.

The manufacturing method of the straw is formed by laminating a plurality of continuous paper layers, and the paper layers are more easily rotten and degraded compared with plastic, so that the straw made of plastic can be effectively prevented from causing great pollution to the environment; and the paper layer is adopted to make the straw, and then the straw can be recycled to make paper pulp again for recycling, and the paper layer recycling technology and equipment are mature, so that the corresponding recycling treatment cost is lower.

The above description is only a part of the embodiments of the present application, and not intended to limit the scope of the present application, and all equivalent devices or equivalent processes performed by the content of the present application and the attached drawings, or directly or indirectly applied to other related technical fields, are also included in the scope of the present application.

Claims

1. A manufacturing method of a straw is characterized by comprising the following steps:

s1, providing a plurality of continuous paper layers;

s2, the paper layers are partially overlapped in the width direction to form a paper blank;

s3, spirally rolling the paper blank to form a hollow paper tube;

and S4, cutting the hollow paper tube according to a preset length to obtain the straw.

2. The method for manufacturing a drinking straw as claimed in claim 1,

3. The method for manufacturing a drinking straw as claimed in claim 1,

4. The method for manufacturing a straw according to any one of claims 1 to 3, wherein the S3 comprises:

the paper blank is spirally wound on the rotating shaft;

the rotating shaft rotates around the central axis of the rotating shaft and moves linearly with the paper blank along the central axis of the rotating shaft to form the hollow straw.

5. The method of claim 4, wherein the web is spirally wound around the rotating shaft from an angle at which the longitudinal direction and the width direction intersect.

6. The method for manufacturing a drinking straw as claimed in claim 1,

in S1, each of the paper layers is conveyed by being tensioned by a conveying roller.

7. The method for manufacturing a drinking straw as claimed in claim 1,

the S4 includes:

the hollow paper tube is cut off according to a preset length;

and embossing and bending the cut hollow paper tube.

8. The method for manufacturing a drinking straw according to any one of claims 1 to 3 and 6 to 7,

in S1, the plurality of continuous paper layers includes a first paper layer, a second paper layer, and a third paper layer;

in said S2:

one side edge of the second paper layer is opposite to the central line of the first paper layer and is arranged with the first paper layer in a laminated mode, and one side edge of the third paper layer is opposite to the central line of the second paper layer and is arranged with the second paper layer in a laminated mode, so that the paper blank is formed.

9. A drinking straw, comprising a side wall, said side wall being formed by a cardboard, characterized in that said cardboard comprises a plurality of paper layers which are laminated and which are partially overlapped in the width direction.

10. The pipette according to claim 9,

the paper layers are a first paper layer, a second paper layer and a third paper layer, one side edge of the second paper layer is opposite to the central line of the first paper layer and is arranged in a laminated mode with the first paper layer, and one side edge of the third paper layer is opposite to the central line of the second paper layer and is arranged in a laminated mode with the second paper layer.

11. The pipette according to claim 10,

the width of the first paper layer is 8-20mm, and/or the width of the second paper layer is 7-18mm, and/or the width of the third paper layer is 5-15 mm.

12. The pipette according to claim 9,

the gram weight of each paper layer in the plurality of paper layers is 50g/m²-150g/m²。

13. The pipette according to claim 9,

the tensile strength of each of the paper layers in the plurality of paper layers is not less than 5kN/m, and/or the elongation at break of each of the paper layers in the plurality of paper layers is not less than 5%.

14. The pipette according to claim 13,

the tensile strength of each paper layer in the length direction is not less than 7kN/m, and the tensile strength of each paper layer in the width direction is not less than 5 kN/m.

15. The pipette according to claim 13 or 14,

the elongation at break of each paper layer in the length direction is not less than 5%, and the elongation at break of each paper layer in the width direction is not less than 7%.

16. The pipette according to claim 13,

each of the plurality of paper layers has a surface water absorption value of no greater than 30 g/m.

17. The pipette according to claim 9,

the distance between the side wall and one end of the side wall is 1/4-1/2 of the length of the straw, and the side wall is also provided with a groove embossing which comprises a plurality of grooves arranged in parallel.

18. The pipette of claim 17 wherein,

the length of the groove embossing along the extending direction of the straw is 0.5cm-5cm, and the depth of each groove is 0.1mm-5 mm.