39 results about "Bursting strength" patented technology

The present disclosure provides a heat-sealable paper product for use in overwrapping, wherein the heat-sealable paper product: —comprises a paper substrate being a machine-glazed (MG) kraft paper having a glazed side and a non-glazed side, wherein the glazed side of the MG kraft paper is coated with a heat-sealable coating; —has thickness of equal to or below 85 μm according to ISO 534:2011; —has a tensile energy absorption (TEA) in cross direction (CD) of at least 60 J / m2 according to ISO 1924-3:2011; and—has a burst strength of at least 170 kPa according to ISO 2758:2014. The present disclosure also provides a method of producing a heat-sealable paper product for use in overwrapping as well as a method of overwrapping an item in a heat-sealable paper product.

The utility model discloses an air pressure type bursting strength tester which comprises a working table, the top of the working table is fixedly connected with a sealing gasket, the bottom of the working table is fixedly connected with an air delivery pipe in an inserted mode, the position, close to the rear side, of the top of the working table is fixedly connected with a fixing frame, and the top of the inner side of the fixing frame is fixedly connected with a hydraulic rod. According to the air pressure type bursting strength tester, when the protective cover is installed, the nut is screwed through an external tool, so that the movable block moves to be far away from the inner side of the connecting frame, then the protective cover is moved, the protective cover drives the through hole in the connecting frame to wrap the outer side of the vertical rod, and then the nut is screwed reversely through the external tool, so that the vertical rod is damaged. Compared with the prior art, the device has the advantages that the protective cover of the device can be replaced according to the width of the textile to be tested, the application range of the device is greatly widened, and the device is suitable for popularization and application.

The invention provides a light and thin stitch-bonded shoe insole non-woven fabric as well as a preparation method and application thereof, and relates to the technical field of insole fabrics. The light and thin stitch-bonded shoe insole non-woven fabric is obtained by weaving and shaping 40wt%-60wt% of high-strength DTY (Draw Textured Yarn) and 60wt%-40wt% of high-strength FDY (Fully Drawn Yarn) fibers; the thickness of the insole non-woven fabric ranges from 0.4 mm to 0.8 mm. The high-strength DTY yarns and the high-strength FDY fibers are mixed according to a specific ratio, and are woven and shaped to obtain the insole cloth, the high elasticity of the DTY is complementary with the high strength and low shrinkage of the FDY, and the contradictory performance balance of lightness, thinness and toughness is realized, so that the insole cloth has the advantages that the thickness and weight of the insole cloth are reduced, and the service life of the insole cloth is prolonged. And good wear resistance, tensile strength and rupture strength can still be maintained.

A hose and / or a datacenter liquid cooling system with such hose that is flexible and may have high-green strength, flame-resistance, reduced leaching of extractables, and / or a low profile. The inner tube is formed from an elastomeric composition comprising one or more EPDM(s) constituting a majority of base polymer, a filler package, and a peroxide cure package, such that the cured elastomeric composition reduces extractable leaching. The outer cover layer is thin-walled and formed from an elastomeric composition comprising EPDM(s), a filler package, and a cure package, in which the cured elastomeric composition satisfies flammability requirements of UL 94 standard. A dual-denier reinforcement layer includes inner reinforcement yarns between 2,000 to 4,5000 denier, an intermediate layer, and outer reinforcement yarns between 1,000 to 1,500 denier, in which the greater denier inner reinforcement offers burst strength, and the lesser denier outer reinforcement reduces strike through of the thin-walled outer cover layer.

To provide a kitchen towel roll package that maintains the quality of a kitchen towel roll even when a long kitchen towel roll is packaged in wrapping paper, and is easy to hold as the wrapping paper is not easily torn when held by hand.SOLUTION: A kitchen towel roll package is made by winding up a 2-ply or 3-ply kitchen towel sheet into a roll, and wrapping two rolls side by side so that the axial directions are approximately parallel in wrapping paper. The wrapping paper has a burst strength of 130 kPa to 230 kPa, the roll length of the kitchen towel roll is 24 m to 50 m, the roll weight is 240 g to 640 g, the winding density is 0.42 m / cm2 to 0.99 m / cm2, the roll density is 0.10 g / cm3 to 0.27 g / cm3, and the paper thickness of the kitchen towel sheet is 1.7 mm / 10 ply to 3.7 mm / 10 ply.SELECTED DRAWING: Figure 1

The invention provides a packaging box bursting strength detection device and a detection method, and mainly relates to the field of material detection. A packaging box bursting strength detection device comprises a bursting strength testing machine, a composite environment test box and a transfer mechanism, a humidity module, a warming module and a temperature and humidity detection sensor are arranged in the composite environment test box, an indexing rotating mechanism is arranged at the bottom of the composite environment test box, and a center shaft is arranged at the top of the indexing rotating mechanism. A plurality of layers of bearing frames are arranged on the center shaft in a sliding mode, a plurality of bearing discs are evenly arranged on each layer of bearing frame in a circumferential mode, the transferring mechanism comprises an action unit and a grabbing unit, and the grabbing unit is used for grabbing samples in the composite environment test box. The method has the beneficial effects that different humidity environments are created, the burst strength data of the carton in the different humidity environments are obtained, reference is provided for packaging box model selection in the special humid environment, and the situation that goods transportation and storage are affected after the humid strength of the packaging box is reduced is avoided.

The invention relates to a method for predicting the service life of a glass reinforced plastic pipe under the stress action. The method comprises the following specific steps: performing a hydrostatic test on a to-be-tested glass reinforced plastic pipe under the stress action; performing a hydraulic bursting test on the glass fiber reinforced plastic pipe subjected to the hydrostatic test; fitting the data of the hydrostatic pressure time and the bursting strength value, taking the logarithm value of the hydrostatic pressure time as an abscissa and the logarithm value of the bursting strength as an ordinate, performing numerical fitting by utilizing a linear regression method to obtain a fitting equation lnP = a * lnt + b of the hydrostatic pressure time and the bursting strength value, and calculating the service life of the glass fiber reinforced plastic pipe. The invention provides a novel glass reinforced plastic pipe service life prediction method based on stress action, overcomes the defects of the existing service life prediction technology of a glass reinforced plastic pipe for gathering and transportation in an oil and gas field, and can predict the service life of the glass reinforced plastic pipe under the combined action of four influence factors, namely pipe characteristics, a conveying medium, environmental factors and a stress state. The method is short in test period, convenient to implement and high in prediction reliability.

The utility model relates to the technical field of corrugated paper box detection, and provides a switching device for a corrugated paper box bursting strength test, which comprises an equipment main body, the top of the equipment main body is provided with a transmission mechanism, and the bottom of the transmission mechanism is fixedly connected with a fixed column; the transmission mechanism and the pressing plates are arranged, the two sets of pressing plates are arranged, and the bottom of one set of pressing plates is provided with a conical sharp object, so that a worker can place a corrugated board on the top of the placement table, then the transmission mechanism drives the two sets of pressing plates to descend, and one set of pressing plates applies pressure to the corrugated board for detection; after the detection is finished, the transmission mechanism drives the two groups of pressing plates to rotate, so that the pressing plate with the conical sharp object at the bottom rotates to a detection area, and at the moment, the transmission mechanism drives the two groups of pressing plates to descend, so that the pressing plate with the conical sharp object at the bottom applies pressure to the corrugated board for detection; therefore, the corrugated board is subjected to pressure detection by two different forces, so that the accuracy of a detection result is ensured.

The utility model relates to a hydrogel burst strength testing device and system, and belongs to the technical field of gel testing. The testing device comprises a pressing plate and a base. A sealing ring is installed on the face, facing the base, of the pressing plate, a template and a substrate are sequentially arranged between the sealing ring and the base, holes are formed in the pressing plate, the template and the substrate respectively to form a through hole channel, the hole channel is communicated with the blind hole of the base, and a through opening is formed in the side wall of the blind hole. The sizes of holes in the pressing plate, the template and the substrate are sequentially reduced, and the size of the hole in the substrate is smaller than the diameter of the blind hole; the pressing plate and the base are fixed through a plurality of hanging ring fixing bolts. According to the testing device, the base, the template and the holes are concentrically arranged, and the small holes are formed in the position of the base, so that the hydrogel can be completely formed without leakage, and the plugging requirement of a test can be met. The test main body can be assembled by installing a plurality of hanging ring fixing bolts, so that the fastening pressure is convenient to adjust, and the rapid test is convenient.

This utility model discloses a universal auxiliary fixture for testing the pressure resistance and burst strength of aluminum shells. It includes a testing device with a base mounted on its bottom and a testing platform mounted on the top of the base. A support block is fitted onto the surface of the testing platform. The left side of a clamping assembly is fixedly connected to the right side of the support block. The bottom of a cleaning mechanism is slidably connected to the top of the support block. The cleaning mechanism includes a housing, the bottom of which is slidably connected to the top of the support block, and a connecting block is fixedly connected to the top of the housing. This utility model uses the clamping assembly to clamp and position the aluminum shell on the top of the testing platform, facilitating the testing of the aluminum shell by the testing device. Then, the cleaning mechanism and collecting assembly clean and collect the residue and debris from the aluminum shell on the top of the testing platform. This universal auxiliary fixture for testing the pressure resistance and burst strength of aluminum shells improves the stability of the auxiliary fixture and prevents residue and debris from the aluminum shell from adhering to the surface of the testing platform.

1. Name of the product in this design: Digital Bursting Strength Tester (GT-7013-MP). 2. Purpose of this design: To test the fracture strength of materials or products, and to assist in quality control, research and development, performance evaluation and standard testing. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key features: the front view.

The invention belongs to the technical field of preparation of specialty paper, and particularly relates to a production method of specialty paper. According to the production method of the specialty paper, the bleached sulfate masson pine pulp and the bleached wheat straw pulp are compounded for use, a long-short fiber interlaced three-dimensional skeleton structure is constructed, modified calcium titanate whiskers, modified magnesium borate whiskers and polyacrylate microspheres are used as fillers, and the special paper is prepared by compounding the modified calcium titanate whiskers, the modified magnesium borate whiskers and the polyacrylate microspheres. The rigid framework of the modified calcium titanate whisker and the flexible buffering of the modified magnesium borate whisker form stress gradient transfer, the addition of the polyacrylate microspheres can reduce local stress concentration, the synergistic effect of the three can improve the tensile strength and folding strength, and the high retention rate of the acorn starch can ensure that the filler is in full contact with fibers. A compact reaction site is provided for trans-aconitic acid cross-linking, so that a water-resistant cross-linked network is formed. Therefore, through the synergistic effect of the raw materials, it is ensured that the produced specialty paper has excellent dry tensile strength, bursting strength, folding strength and wet strength retention rate.

The utility model discloses a carton bursting strength testing device which comprises a bursting strength testing machine body, a hydraulic part is installed on the bursting strength testing machine body, the output end of the hydraulic part is connected with an upper clamping plate, and the operation end face of the bursting strength testing machine body is connected with a lower clamping plate; a connecting plate drives a connecting ring to move downwards and can drive a connecting rod to move downwards, so that the connecting rod drives a round pipe to move downwards, the round pipe drives an inlet hole to move downwards from a round hole into a top groove, and the connecting rod moves into a placing groove, the connecting ring, the connecting rod and a top cover are flush with the top end of an outer ring, and a guide mechanism does not shield a paperboard and is placed on a lower clamping plate; the connecting plate drives the connecting ring to move upwards, the inlet hole moves to the position above the top end of the lower clamping plate, then the hydraulic part is started, the upper clamping plate moves downwards, the upper clamping plate is close to the connecting ring, and therefore the dust suction mechanism can conveniently suck waste scraps left on the upper clamping plate and the lower clamping plate.

The invention discloses a corrugated board base paper bursting strength detection device, and belongs to the technical field of bursting strength detection. The device mainly comprises a machine base, a C-shaped cantilever, an upper pressing air cylinder, a lower clamping base and a negative pressure chip removal assembly. The inner wall of the detection hole of the lower clamping seat is provided with a slope expanding outwards, a dust suction nozzle of the negative pressure chip removal assembly extends to the detection hole, and the upper pressing air cylinder is connected with a linkage trigger plate and matched with an opening and closing unit for controlling an air channel of the chip removal assembly. According to the corrugated board body paper bursting strength detection device, through mechanical linkage logic, negative pressure is automatically closed during downward pressing testing of the upward pressing air cylinder so as to guarantee testing sealing performance, negative pressure is automatically opened during upward moving resetting, and scraps generated by bursting are rapidly sucked away in cooperation with slope guiding of the detection hole; according to the device, the technical problem that the rubber diaphragm is scratched and broken due to accumulation of hard chippings is effectively solved, automatic cleaning is achieved, and the service life of equipment is prolonged.

Provided is a polyamide multifilament which has a fine single-yarn fineness, a product of strength and elongation, and excellent wear resistance. Also provided are a woven fabric using the polyamide multifilament according to the present invention and having excellent tear strength, wear resistance, and air permeability, and a woven fabric having excellent breaking strength, wear resistance, and flexibility. The present invention relates to a polyamide multifilament comprising a core-sheath composite cross-section polyamide fiber, the crystallinity of the sheath part being 35% or less, the single-yarn fineness being 3.0 dtex or less, and the product of strength and elongation being 5.5 or more.

According to the technical scheme, the fiber winding linear design method for the composite material reducer pipe comprises the following steps that (1) an equal-thickness winding curve equation, generated by a cubic interpolation spline curve, of the reducer pipe is established on the basis of the differential geometry theory, and a slip coefficient calculation formula and non-bridging conditions of the equal-thickness winding curve equation are provided; (2) providing necessary conditions of an initial winding angle for stable winding according to requirements of end rotation and no bridging of a fiber path; (3) planning a fiber path by using a winding line type composed of an equal-thickness winding curve and a semi-geodesic line; and (4) designing a winding mode in which the fibers uniformly cover the core mold. The invention further comprises a computer aided design system developed according to the algorithm. The invention relates to the technical field of fiber reinforced composite material forming process and digital manufacturing, provides a novel method for producing a high-performance low-cost composite material reducer pipe, solves the problems of unsmooth connection and stress concentration between the reducer pipe and a cylindrical pipe, and improves the bursting strength, yield strength, loading capacity and other properties of a pipeline system.

The invention belongs to the technical field of paperboard detection equipment, and particularly relates to a paperboard bursting strength testing machine which comprises a test bed, a fixing seat, an upper positioning assembly, a locking assembly, a supporting circular truncated cone and a rubber diaphragm, the fixing seat is fixedly arranged at the rear end of the top of the test bed, and the upper positioning assembly is fixedly arranged on the front face of the fixing seat; the locking assembly is fixedly arranged on the surface of the upper positioning assembly, and the supporting circular table is fixedly arranged on the top of the test bed. After a paperboard sample is extruded and torn, compressed air in the movable air sleeve and the elastic rubber sleeve leaks into the supporting circular truncated cone through a gap in the tearing position of the paperboard sample piece and is exhausted through a plurality of exhaust holes, and when the air pressure sensor detects that the air pressure value in the movable air sleeve becomes low, an alarm is triggered. And a worker is reminded that the paperboard sample is torn. According to the invention, the bursting strength value of the paperboard can be accurately known.

This invention relates to a method for preparing paper, specifically a method for preparing breathable paper for use in packaging materials. The invention involves a Schiff base reaction between chitosan and sodium alginate oxide, resulting in a more open and porous coating layer on the fiber surface, which facilitates gas flow and thus improves the paper's permeability to a certain extent. The covalent bonds formed by the Schiff base reaction enhance the bonding force between chitosan and sodium alginate oxide, making the coating layer more firmly attached to the wood pulp fiber surface. This enhanced bonding force helps improve the paper's tensile strength, burst strength, and other mechanical properties. The imine bonds generated by the Schiff base reaction have high chemical stability, resisting the effects of external environmental changes such as humidity and temperature on the coating layer, thereby maintaining the long-term stability of the paper's performance.

The utility model discloses a pressure maintaining and blasting test tool for a cloth-sandwiched diaphragm, which integrates dual functions of pressure maintaining test and blasting test, not only can effectively discriminate early leakage or abnormal bumps caused by hidden defects such as uneven distribution of internal fibers, but also can accurately measure the ultimate blasting strength of the cloth-sandwiched diaphragm, and realizes comprehensive evaluation of product performance. By adopting a sealing mode of combining vacuum adsorption and a high-finish sealing ring, a soft and weak cloth clamping membrane can be uniformly, flatly and tightly attached without damage at the beginning of a test, stable and reliable initial sealing is formed, the problem of extrusion damage or untight sealing possibly caused by a traditional mechanical clamp is fundamentally solved, and the test efficiency is improved. A solid foundation is laid for the authenticity of a test result, and the accuracy of test pressure data and the reliability of pressure maintaining process evaluation are jointly guaranteed through the application of an inflation system integrated with a one-way valve and a high-precision monitoring instrument.

This invention relates to a special paper for corner protectors and its preparation process, wherein the special paper for corner protectors has a basis weight of 420 g / m², a basis weight difference of ≤3.0% across widths, and a density of 0.65 ± 0.02 g / cm². 3 Longitudinal ring crush index ≥ 8 N·m / g, interlaminar bond strength ≥ 80 J / m², and burst strength ≥ 1.0 kPa·m 2 / g, the moisture content of the finished paper is 6.8±0.2%, and the COBB value of the finished paper is 200-400g / ㎡; the preparation process includes: (1) preparing sprayed starch, in-slurry starch and filler; (2) pulping; (3) mixing and papermaking; (4) rewinding and packaging. This invention can realize the production of special paper for paper corner protectors by adjusting the pulping, paper machine and other processes, effectively reducing the production cost, reducing the number of paper layers and reducing the amount of glue used in the production of paper corner protectors, and shortening the drying time of the glue in the production of paper corner protectors.

The invention discloses a paper bursting strength test device for papermaking production, and relates to the technical field of paper bursting strength test.The paper bursting strength test device comprises a workbench and a test bed fixedly connected to the top of the workbench, and a hydraulic cylinder is installed in the test bed; the output end of the hydraulic cylinder penetrates through the outside of the test bed and is fixedly connected with a pressing shell, and the inner side of the pressing shell is fixedly connected with a bottom supporting shell below the pressing shell. By arranging the stepped presser and the three groups of pressing rings with the elastic coefficients gradually increased from inside to outside, multi-layer limiting is jointly formed on the edge of the paper in the initial stage, the paper moves upwards in stages along with the action of the detection head subsequently, effective constraint can be formed on the edge of the paper all the time, and it is ensured that breakage of the paper is only caused by breakage pressure applied by the detection head; interference of irrelevant factors such as edge looseness on a test result is eliminated from the source, so that the detection accuracy is improved.

This invention relates to a wet-laid hydrospun biodegradable sisal nonwoven fabric and its preparation method. The method is characterized by: firstly, pre-treated sisal fibers are pulped and mixed with PHBV short fibers to obtain a mixed fiber slurry; finally, the wet-laid hydrospun biodegradable sisal nonwoven fabric is prepared using wet web forming, hydrospun, and hot rolling. In the mixed fiber slurry, the mass content of the mixed fibers is 1-5%, with the remainder being water; the mass content of the PHBV short fibers in the mixed fibers is not less than 20%; during hot rolling, the hot rolling temperature is 135-142℃, the conveyor speed is 25-45 m / min, and the pressure roller linear pressure is 300-500 N / cm; the resulting wet-laid hydrospun biodegradable sisal nonwoven fabric has an areal density of 50-70 g / m³. 2 The transverse breaking strength is 60–80 N, the longitudinal breaking strength is 55–70 N, the bursting strength is 50–85 N, and the abrasion resistance index is 90–105 cycles / mg. The method of this invention is simple, and the nonwoven material produced is completely biodegradable and possesses excellent mechanical properties.

The present invention discloses a method for evaluating the bevel welding rate of an aluminum laminated oil cooler. The method first measures the height of the rib unit before and after welding, calculates the vertical compression H of the rib unit and the welding rate ψ in the direction normal to the bevel of the rib unit, and then compares and evaluates the vertical compression H and the welding rate ψ with the design specification value to determine whether the product meets the qualified rate after welding. If it fails, the design parameters of the relevant components of the laminated oil cooler are adjusted. The present invention can accurately evaluate the welding rate of the product, is easy to operate, and is timely. During the product processing process, this evaluation method can timely adjust the design parameters of the relevant components of the laminated oil cooler to ensure that the bevel welding rate of the product meets the use requirements, thereby effectively improving the product's airtightness qualified rate, burst strength, and other technical indicators, and has good economic and practicality.

A bag comprised of kenaf paper. The bag having certain tensile MD strength, tensile CD strength and a burst strength to function as a paper bag.

The utility model discloses a kind of packaging cartons with high pressure strength, it is related to packaging carton field, including carton main body, support framework is fixedly installed in carton main body, support framework is composed of fixed framework, connecting framework and movable framework, fixed framework is composed of fixed bottom plate, connecting bottom plate, connecting side plate, fixed shaft and baffle, connecting bottom plate has two and is horizontally symmetrical and is fixedly inserted on fixed bottom plate, by setting the support framework of fixed framework, connecting framework and movable framework in carton main body, support framework can support the top wall and bottom wall of carton main body, when carton is subjected to upper pressure, effectively avoid top wall and bottom wall in heavy pressure inwardly concave, guarantee the protection effect of carton to internal article, make stacked carton stacking more stable simultaneously, reduce article damage risk, provide convenience for logistics transportation and warehousing management, improve operation efficiency.

This invention provides a lightweight, thin, stitch-knitted shoe midsole nonwoven fabric, its preparation method, and its application, relating to the field of midsole fabric technology. The lightweight, thin, stitch-knitted shoe midsole nonwoven fabric is obtained by weaving and setting 40wt%-60wt% high-strength DTY yarn and 60wt%-40wt% high-strength FDY fiber; the thickness of the midsole nonwoven fabric is 0.4-0.8mm. This invention obtains the midsole fabric by mixing high-strength DTY yarn and high-strength FDY fiber in a specific ratio, followed by weaving and setting. The high elasticity of DTY complements the high strength and low shrinkage of FDY, achieving a balance between the contradictory properties of "lightweight and strong," thus enabling the midsole fabric to maintain good abrasion resistance, tensile strength, and burst strength while reducing thickness and weight.

The invention discloses a corrugated carton bursting strength testing device, and relates to the technical field of bursting strength detection of technical new material corrugated paperboards, the corrugated carton bursting strength testing device comprises a test board, a tester mounted on the test board, a support rod fixedly connected to the table surface of the test board right below the tester, and a clamp disc fixedly connected to the top end of the support rod, a placement groove is formed in the clamp disc, a correction assembly is arranged on the test table, the correction assembly comprises a sliding groove formed in the test table, a sliding plate is slidably connected into the sliding groove, and a containing table is fixedly connected to the end, away from the sliding groove, of the sliding plate. The corrugated board can uniformly bear the pressure applied by a tester, in addition, when the corrugated board is tested and sampled for multiple times, repeated adjustment is not needed before testing, a detector can quickly place the corrugated board in place and start testing, the testing efficiency is greatly improved, and meanwhile, repeated testing caused by the fact that the corrugated board is tilted is reduced.

This invention belongs to the field of bottle cap production and testing technology, specifically relating to a bursting strength testing system for drinking water bottle caps, including a cap turnover assembly, an outer bursting strength testing assembly, and an inner bursting strength testing assembly. The cap turnover assembly enables batch turnover and orientation flipping of the caps. The outer bursting strength testing assembly uses a wide-headed impact head to simulate the bursting condition of a water dispenser's smart column, while the inner bursting strength testing assembly uses a narrow-headed hammer rod to reproduce the instantaneous force condition of the pull ring at the critical fracture point. This invention employs a dual-weight gradient judgment logic, achieving pass / fail criteria of non-bursting and burstable under two levels of weight. The testing load is precisely controlled through water volume adjustment and counterweight block adjustment. This invention can automate bidirectional bursting strength testing of bottle caps, verify tear structure performance, has high testing efficiency, effectively ensures the sealing and easy-to-open performance of the caps, and is suitable for batch production testing needs.

The utility model relates to the technical field of gray fabric detection, and discloses a tensile property detection device for gray fabric production, which comprises a detection table, and the upper surface of the detection table is fixedly connected with a lifting frame. According to the tensile property detection device for gray fabric production, two functions of tensile property detection and bursting strength detection are integrated, and conversion of different test items can be easily realized by switching a top ball and a top clamping plate in the top assembly and adjusting a pressure sensor and a tension sensor in the bottom assembly; the operation complexity and time cost are greatly reduced, the detection efficiency is improved, pressure and tension changes in the testing process can be monitored in real time through the arranged pressure sensor and tension sensor, the accuracy and reliability of a testing result are ensured, meanwhile, a testing sample can be firmly fixed through the design of the top clamping plate and the bottom clamping plate, and the testing efficiency is improved. Sliding or falling in the testing process is avoided, and the testing precision is further improved.

A bag comprised of kenaf paper. The bag having certain tensile MD strength, tensile CD strength and a burst strength to function as a paper bag.