TW202325180A - Luggage case shell and manufacturing method thereof - Google Patents

Abstract

The present invention provides a luggage case shell and a manufacturing method thereof. The manufacturing method includes the following steps. A heated and softened polyester sheet is subjected to a vacuum blister molding process, so that a surface of the polyester sheet is adsorbed on a surface of a master mold to perform a surface texture processing process of the polyester sheet, and a surface texture of the master mold is transferred to the polyester sheet to form the luggage case shell.

Description

Luggage case and manufacturing method thereof

The present invention relates to a luggage case and its manufacturing method, and in particular to a polyester luggage case and its manufacturing method.

Plastic suitcases are used to embossing on the surface to make the case shell have textures, so as to achieve scratch resistance, tactile feeling and visual beauty. Existing methods often use PC, ABS, PP and other materials to extrude machine-made boards. During the board extrusion molding process, embossing is directly carried out with an embossing wheel, and then the board is cut to an appropriate size, and then the plastic board is softened by heating. Use the shell male mold mold vacuum suction speed molding to make the luggage shell.

However, in the existing manufacturing method, because the board is first embossed and then vacuum formed, the original embossed lines may be stretched and flattened due to the different molding ratios of each part of the shell, making the appearance of the embossed lines uneven or even flat, which will affect the suitcase. Aesthetic appearance.

Based on the above, developing a manufacturing method of a luggage case to make the texture of the case uniform so as to improve the aesthetics and texture of the luggage case is an important subject of current research.

The invention provides a suitcase shell and a manufacturing method thereof, which can make the texture of the shell uniform without being affected by the molding elongation ratio, so as to improve the appearance and texture of the suitcase.

The manufacturing method of the luggage case of the present invention includes the following steps. The heated and softened polyester sheet is subjected to a vacuum suction molding process, so that the surface of the polyester sheet and the surface of the master mold are adsorbed to process the surface texture of the polyester sheet, and the surface texture of the master mold is transferred to the Polyester sheet to form the trunk shell.

In an embodiment of the present invention, the manufacturing method of the luggage case further includes performing a gas pressurization process during the vacuum blister forming process.

In one embodiment of the present invention, the gas pressurization process includes the use of high-pressure gas with a pressure of 15 kg/cm ² to 45 kg/cm ² .

In an embodiment of the present invention, the heating softening temperature of the polyester sheet is 85°C to 140°C.

In an embodiment of the present invention, the temperature of the master mold is 110° C. to 160° C. to crystallize the polyester sheet.

In an embodiment of the present invention, the crystallinity of the crystallized polyester sheet is 8.5% to 25%.

In an embodiment of the present invention, the surface texture depth of the master mold is less than or equal to 1/2 thickness of the polyester sheet.

In an embodiment of the present invention, the thickness of the polyester sheet is 0.8 mm to 4.5 mm.

In an embodiment of the present invention, the polyester sheet includes PET resin, the PET resin includes primary pellets or environmentally friendly recycled pellets, and the relative viscosity of the PET resin is 0.60 to 1.1.

The luggage shell of the present invention is made by the above-mentioned manufacturing method of the luggage shell, and the impact strength of the luggage shell is greater than 30 kg-cm/cm.

Based on the above, the present invention provides a luggage case and a manufacturing method thereof, which can make the texture of the case uniform without being affected by the molding elongation ratio, so as to improve the appearance and texture of the luggage case. In addition, there is no need for embossing wheels for extrusion, which can save the cost of embossing wheels. On the other hand, it is more flexible to design the pattern of the master mold and produce personalized patterns. The PET material used has the characteristics of high impact strength, high rigidity, low density and easy processing. In addition to PET primary grains, environmentally friendly recycled PET can be used, and its mechanical properties are equivalent to those of primary grains. Therefore, recycled materials can be imported needs.

Hereinafter, embodiments of the present invention will be described in detail. However, these embodiments are illustrative, and the present disclosure is not limited thereto.

Herein, a range indicated by "one value to another value" is a general representation which avoids enumerating all values in the range in the specification. Therefore, the description of a specific numerical range covers any numerical value within the numerical range and the smaller numerical range bounded by any numerical value within the numerical range, as if the arbitrary numerical value and the smaller numerical range are written in the specification. The value range is the same.

The invention proposes a method for manufacturing a luggage case, which mainly uses a master mold to process surface textures of polyester sheets in a vacuum suction molding process. More specifically, the manufacturing method of the luggage shell of the present invention includes the following steps. The heated and softened polyester sheet is subjected to a vacuum suction molding process, so that the surface of the polyester sheet and the surface of the master mold are adsorbed to process the surface texture of the polyester sheet, and the surface texture of the master mold is transferred to the Polyester sheet to form the trunk shell.

The manufacturing method of the luggage shell of the present invention may further include performing a gas pressurization process during the vacuum blister forming process to speed up the forming process. In this embodiment, the gas pressurization process includes the use of high-pressure gas at a pressure of 15 kg/cm ² to 45 kg/cm ² .

In this embodiment, the heating softening temperature of the polyester sheet is, for example, 85°C to 145°C. The temperature of the master mold is, for example, controlled at 110°C to 160°C to crystallize the polyester sheet, and the crystallinity of the crystallized polyester sheet is, for example, 8.5% to 25% to improve the heat resistance of the luggage case shell. After 14 days at 70°C, the cabinet has no shape change. Compared with the conventional film forming technology, most of them do not control the temperature. Therefore, crystallization will not occur, which leads to the disadvantages of texture change and poor heat resistance. In more detail, the surface texture depth of the master mold is, for example, less than or equal to 1/2 the thickness of the polyester sheet, and the thickness of the polyester sheet is, for example, 0.8 mm to 4.5 mm, preferably, for example, 1 mm to 4 mm. mm, optimally such as 1.2 mm to 3.5 mm. In this way, the texture of the shell can be formed well, and it has excellent impact resistance properties, and the impact resistance strength is greater than 30 kg-cm/cm.

In this embodiment, the polyester sheet is processed from an impact-resistant polyester composition. The impact-resistant polyester composition may include PET resin, impact modifier, compatibilizer, antioxidant and slip agent. Based on the total weight of the impact-resistant polyester composition, the content of the PET resin is, for example, 70 wt% to 92 wt%, the content of the impact modifier is, for example, 5 wt% to 15 wt%, and the content of the compatibilizer is, for example, 2 wt% to 15 wt%, the content of antioxidant is, for example, 0.1 wt% to 1 wt%, and the content of slip agent is, for example, 0.1 wt% to 1 wt%. The impact-resistant polyester composition obtained by kneading and modifying the above components has the characteristics of high impact strength, high rigidity, low density and easy processing, and is suitable for impact-resistant extrusion and vacuum forming products, such as luggage shells.

In this embodiment, the PET resin may include raw pellets or environmentally friendly recycled pellets, wherein the sources of environmentally friendly recycled pellets may include recycled pellets for bottles, recycled film materials, recycled fabric pellets, or industrially recycled environmentally friendly recycled polyester pellets (release film etc.), in order to realize the requirement of importing recycled materials, but the present invention is not limited thereto. The relative viscosity of PET resin is, for example, 0.60 to 1.1.

In this embodiment, the impact modifier is, for example, polyolefin elastomer (POE). The compatibilizer is dispersed in the impact-resistant polyester composition, such as polyolefin elastomer grafted glycidyl methacrylate (POE-g-GMA) and polyolefin elastomer grafted maleic anhydride (POE-g-GMA) g-MAH) at least one of them. The antioxidant is at least one selected from the material group consisting of phenolic antioxidants, phosphorous acid antioxidants, and hindered phenolic antioxidants. The slip agent is at least one selected from the material group consisting of silicon dioxide, stearic acid, polyethylene wax, stearates, fatty acid esters, and composite slip agents, but the present invention does not rely on This is the limit.

The present invention also discloses a suitcase shell, which is made by the above-mentioned manufacturing method of the suitcase shell, and the impact resistance strength of the suitcase shell is greater than 30 kg-cm/cm.

Hereinafter, the above-mentioned luggage case of the present invention and its manufacturing method will be described in detail by using experimental examples. However, the following experimental examples are not intended to limit the present invention. Experimental example

In order to prove that the manufacturing method proposed by the present invention can manufacture a suitcase shell with good impact strength and heat resistance, the following experiment example is specially made.

Table 1 below lists the dosage ratios, processing conditions and physical property results of each component in Examples 1 to 5 and Comparative Examples. Table 1 Recipe Example 1 Example 2 Example 3 Example 4 Example 5 comparative example Dosage ratio PET resin 88 90 76 86 78 87 impact modifier 7 6 14 8 14 8 Compatibilizer 4.2 3.2 9.2 5.2 7.2 4.2 Antioxidants 0.5 0.5 0.5 0.5 0.5 0.5 lubricant 0.3 0.3 0.3 0.3 0.3 0.3 Processing conditions Plate thickness mm 2.1 2.1 2.5 2.3 1.8 2.1 Mold texture depth mm 0.3 0.3 0.2 0.1 0.15 0.1 Gas pressurized molding pressure kg/cm ² 20 20 25 20 15 none Plate forming temperature ℃ 100 110 130 100 120 110 Forming mold temperature ℃ 110 130 150 130 130 50 physical properties Crystallinity of molded product 8.5% 9.2% 18.8% 14.6% 13.8% 2.8% Impact strength kg-cm/cm 42.8 40.1 32.5 38.2 35.1 51 texture integrity good good good good good Difference Heat resistance: 70℃*14 days OK no change OK no change OK no change OK no change OK no change NG shell has deformation Consumption ratio unit: parts by weight Example 1

PET resin 88% by weight, impact modifier polyolefin elastomer (POE) 7% by weight, compatibilizer polyolefin elastomer grafted glycidyl methacrylate (POE-g-GMA) 4.2% by weight . Antioxidant Phosphite antioxidant 0.5% by weight, slip agent silicon dioxide 0.3%. Composed of the above formula, it can be mixed and granulated first to obtain a uniformly mixed high-impact masterbatch, and then through an extrusion machine to obtain a board for a suitcase board; the above formula can also be mixed evenly and directly on the extrusion machine board for a suitcase Using boards, this construction method is well known in the industry.

The thickness of the plate is 2.1mm, the depth of the forming mold is 0.3mm, and the temperature is 110°C. Put the plate into the oven of the molding machine to heat it, so that the surface film temperature of the plate is 100°C, then enter the forming area for vacuum forming, and at the same time use 20kg/cm2 gas pressurization to assist the forming, the setting time is 5 seconds, and then release the gas ^pressure Remove the trunk shell for normal pressure. Analysis of the suitcase shell shows that the crystallinity is 8.5%, the impact strength is 42.8kg-cm/cm, and the embossed lines are complete and good. The shell has passed the heat resistance test at 70°C for 14 days, and the shell has no deformation. Example 2

PET resin 90% by weight, impact modifier polyolefin elastomer (POE) 6% by weight, compatibilizer polyolefin elastomer grafted glycidyl methacrylate (POE-g-GMA) 3.2% by weight . Antioxidant Phosphite antioxidant 0.5% by weight, slip agent silicon dioxide 0.3%. Composed of the above formula, it can be mixed and granulated first to obtain a uniformly mixed high-impact masterbatch, and then through an extrusion machine to obtain a board for a suitcase board; the above formula can also be mixed evenly and directly on the extrusion machine board for a suitcase Using boards, this construction method is well known in the industry.

The thickness of the plate is 2.1mm, the depth of the forming mold is 0.3mm, and the temperature is 130°C. Put the plate into the oven of the molding machine to heat it, so that the surface film temperature of the plate is 110°C, then enter the forming area for vacuum suction molding, and at the same time use 20kg/cm2 gas pressurization to assist the forming, the setting time is 5 seconds, and then release the gas ^pressure Remove the trunk shell for normal pressure. Analysis of the suitcase shell shows that the crystallinity is 9.2%, the impact strength is 40.1kg-cm/cm, and the embossed lines are complete and good. The shell has passed the heat resistance test at 70°C for 14 days, and the shell has no deformation. Example 3

PET resin 76% by weight, impact modifier polyolefin elastomer (POE) 14% by weight, compatibilizer polyolefin elastomer grafted glycidyl methacrylate (POE-g-GMA) 9.2% by weight . Antioxidant Phosphite antioxidant 0.5% by weight, slip agent silicon dioxide 0.3%. Composed of the above formula, it can be mixed and granulated first to obtain a uniformly mixed high-impact masterbatch, and then through an extrusion machine to obtain a board for a suitcase board; the above formula can also be mixed evenly and directly on the extrusion machine board for a suitcase Using boards, this construction method is well known in the industry.

The thickness of the plate is 2.5mm, the depth of the forming mold is 0.2mm, and the temperature is 150°C. Put the plate into the oven of the molding machine to heat it, so that the surface film temperature of the plate is 130°C, then enter the forming area for vacuum forming, and at the same time use 25kg/cm ² gas pressurization to assist the forming, the setting time is 5 seconds, and then release the gas pressure Remove the trunk shell for normal pressure. Analysis of the suitcase shell shows that the crystallinity is 18.8%, the impact strength is 32.5kg-cm/cm, and the embossed lines are complete and good. The shell has passed the heat resistance test at 70°C for 14 days, and the shell has no shape change. Example 4

PET resin 86% by weight, impact modifier polyolefin elastomer (POE) 8% by weight, compatibilizer polyolefin elastomer grafted glycidyl methacrylate (POE-g-GMA) 5.2% by weight . Antioxidant Phosphite antioxidant 0.5% by weight, slip agent silicon dioxide 0.3%. Composed of the above formula, it can be mixed and granulated first to obtain a uniformly mixed high-impact masterbatch, and then through an extrusion machine to obtain a board for a suitcase board; the above formula can also be mixed evenly and directly on the extrusion machine board for a suitcase Using boards, this construction method is well known in the industry.

The thickness of the plate is 2.3mm, the depth of the forming mold is 0.1mm, and the temperature is 130°C. Put the plate into the oven of the molding machine to heat it, so that the surface film temperature of the plate is 100°C, then enter the forming area for vacuum forming, and at the same time use 20kg/cm2 gas pressurization to assist the forming, the setting time is 5 seconds, and then release the gas ^pressure Remove the trunk shell for normal pressure. Analyzing the suitcase shell, the crystallinity is 14.6%, the impact strength is 38.2kg-cm/cm, and the embossed lines are complete and good. The shell has passed the heat resistance test at 70°C for 14 days, and the shell has no shape change. Example 5

PET resin 78% by weight, impact modifier polyolefin elastomer (POE) 14% by weight, compatibilizer polyolefin elastomer grafted glycidyl methacrylate (POE-g-GMA) 7.2% by weight . Antioxidant Phosphite antioxidant 0.5% by weight, slip agent silicon dioxide 0.3%. Composed of the above formula, it can be mixed and granulated first to obtain a uniformly mixed high-impact masterbatch, and then through an extrusion machine to obtain a board for a suitcase board; the above formula can also be mixed evenly and directly on the extrusion machine board for a suitcase Using boards, this construction method is well known in the industry.

The thickness of the plate is 1.8mm, the depth of the forming mold is 0.15mm, and the temperature is 130°C. First put the plate into the oven of the forming machine to heat it so that the film temperature on the surface of the plate is 120°C, then enter the forming area for vacuum suction molding, and at the same time use 15kg/cm ² gas pressurization to assist the forming, the setting time is 5 seconds, and then release the gas pressure Remove the trunk shell for normal pressure. Analyzing the suitcase shell, the crystallinity is 13.8%, the impact strength is 35.1kg-cm/cm, and the embossed lines are complete and good. The shell has passed the heat resistance test at 70°C for 14 days, and the shell has no shape change. comparative example

PET resin 87% by weight, impact modifier polyolefin elastomer (POE) 8% by weight, compatibilizer polyolefin elastomer grafted glycidyl methacrylate (POE-g-GMA) 4.2% by weight . Antioxidant Phosphite antioxidant 0.5% by weight, slip agent silicon dioxide 0.3%. The thickness of the plate is 2.1mm, the depth of the forming mold is 0.1mm, and the temperature is 50°C. Put the board into the oven of the molding machine to heat it up, so that the mold temperature on the surface of the board is 110°C, and then enter the molding area for vacuum suction molding. The setting time is 5 seconds, and then release the gas pressure to normal pressure to take out the suitcase shell. Analysis of the suitcase shell shows that the crystallinity is 2.8%, the impact strength is 51kg-cm/cm, the embossed lines are poor, and some lines are not obvious, and the shell has undergone a heat resistance test at 70°C for 14 days, and the shell will change shape.

In example 1 to example 5, vacuum forming process, sheet surface film temperature 85-140 ℃, mold temperature 110 ℃ to 160 ℃, and at the same time with 10 kg/cm ² to 45 kg/cm ² gas pressure-assisted forming, can make PET The surface texture of the board is uniform and beautiful. And because the temperature reaches the crystallization temperature, the crystallinity can reach 8.5% to 25%, so that the suitcase shell made will not change shape under the high temperature environment of 70°C.

As for the comparative example, the vacuum forming mold was processed at a temperature of 50°C, which was not enough to induce crystallization of the PET material, resulting in insufficient heat resistance of the product. After a heat resistance test at 70°C for 14 days, the shell was obviously deformed and did not meet the requirements for luggage products. The embossed texture is poor, the texture is uneven, and some textures are not obvious. Test Methods

Crystallinity test method: Analyzed by DSC spectrum, calculated by the following formula: Crystallinity = [melting peak area - recrystallization peak area) / theoretical enthalpy of 100% crystallization] X100%, where the theoretical enthalpy of 100% crystallization is calculated as 140J/g

Impact strength test method: ASTM256

To sum up, the present invention provides a suitcase shell and a manufacturing method thereof, which can make the texture of the shell uniform without being affected by the molding elongation ratio, so as to improve the texture of the suitcase. In addition, there is no need for embossing wheels for extrusion, which can save the cost of embossing wheels. On the other hand, it is more flexible to design the pattern of the master mold and produce personalized patterns. The PET material used has the characteristics of high impact strength, high rigidity, low density and easy processing. In addition to PET primary grains, environmentally friendly recycled PET can be used, and its mechanical properties are equivalent to those of primary grains. Therefore, recycled materials can be imported needs. The manufactured luggage shell not only has a well-formed shell pattern, but also has excellent impact resistance and heat resistance, and is both beautiful and practical.

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Claims (10)

A method of manufacturing a luggage case, comprising: The heated and softened polyester sheet is subjected to a vacuum suction molding process, so that the surface of the polyester sheet and the surface of the master mold are adsorbed, so as to process the surface texture of the polyester sheet, and the master mold The surface texture is transferred to the polyester sheet to form the luggage shell. The method for manufacturing a luggage shell as claimed in Claim 1 further includes performing a gas pressurization process during the vacuum blister forming process. The method for manufacturing a luggage case according to claim 2, wherein the gas pressurization process includes using high-pressure gas with a pressure of 15 kg/cm ² to 45 kg/cm ² . The method for manufacturing a luggage case according to claim 1, wherein the softening temperature of the polyester sheet is 85°C to 140°C. The method for manufacturing a luggage shell according to claim 1, wherein the temperature of the master mold is 110°C to 160°C to crystallize the polyester sheet. The manufacturing method of the luggage shell according to claim 5, wherein the crystallinity of the crystallized polyester sheet is 8.5% to 25%. The method for manufacturing a luggage case according to claim 1, wherein the surface texture depth of the master mold is less than or equal to 1/2 of the thickness of the polyester sheet. The method for manufacturing a luggage case according to claim 1, wherein the thickness of the polyester sheet is 0.8 mm to 4.5 mm. The method for manufacturing a luggage case according to claim 1, wherein the polyester sheet includes PET resin, the PET resin includes primary grains or environmentally friendly recycled grains, and the relative viscosity of the PET resin is 0.60 to 1.1. A luggage case made by the method for manufacturing a luggage case described in any one of claim 1 to claim 9, the impact resistance of the luggage case is greater than 30 kg-cm/cm.