TWI818388B - 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 shell and method of manufacturing same

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

Plastic suitcases are often embossed on the surface to give the case a texture to achieve scratch resistance, tactility, and visual beauty. Existing production methods often use PC, ABS, PP and other materials to extrudate machine-made boards. During the board extrusion molding process, the embossing wheel is used to directly emboss the board, and then the board is cut to the appropriate size, and then heated to soften the plastic board. The male shell mold is used for vacuum suction molding to make the suitcase shell.

However, in the existing manufacturing method, the board is embossed first and then vacuum formed. Due to the different molding magnification of each part of the shell, the original embossed texture may be stretched and flattened, making the embossed texture uneven in appearance or even flat, affecting the suitcase. Appearance beauty.

Based on the above, developing a method for manufacturing a suitcase shell to make the shell texture uniform and improve the appearance and texture of the suitcase is an important topic currently required for research.

The present invention provides a luggage case shell and a manufacturing method thereof, which are not affected by the molding extension ratio and can make the shell texture uniform to improve the appearance and texture of the luggage case.

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

In one embodiment of the present invention, the manufacturing method of the suitcase shell further includes performing a gas pressurization process during the vacuum blister molding process.

In one embodiment of the present invention, the gas pressurization process includes using 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 one embodiment of the present invention, the temperature of the master mold is 110°C to 160°C to cause crystallization of the polyester sheet.

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

In one embodiment of the present invention, the surface texture depth of the master mold is less than or equal to 1/2 of the 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 one embodiment of the present invention, the polyester sheet includes PET resin, the PET resin includes virgin particles or environmentally friendly recycled particles, and the relative viscosity of the PET resin is 0.60 to 1.1.

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

Based on the above, the present invention provides a luggage case shell and a manufacturing method thereof, which are not affected by the molding extension ratio and can make the shell texture uniform to enhance the appearance and texture of the luggage case. In addition, extrusion plate making does not require an embossing wheel, which can save the cost of embossing wheels. On the other hand, the pattern of the master mold can be flexibly designed to 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 virgin pellets, environmentally friendly recycled PET can also be used. Its mechanical properties are equivalent to virgin pellets. Therefore, recycled materials can be introduced. 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.

In this article, the range expressed by "one value to another value" is a summary expression that avoids enumerating all the values in the range one by one in the specification. Therefore, the description of a specific numerical range covers any numerical value within the numerical range and the smaller numerical range defined by any numerical value within the numerical range, just as if the arbitrary numerical value and the smaller numerical range are written in the description. The numerical range is the same.

The invention proposes a method for manufacturing a luggage case shell, which mainly involves using a master mold to process the surface texture of a polyester sheet during a vacuum blister molding process. In more detail, the manufacturing method of the luggage case shell of the present invention includes the following steps. The heated and softened polyester sheet is subjected to a vacuum blister molding process, so that the surface of the polyester sheet and the surface of the master mold are adsorbed to perform the surface texture processing process of the polyester sheet, and the surface texture of the master mold is transferred to Polyester sheets to form the suitcase shell.

The manufacturing method of the luggage case shell of the present invention may further include performing a gas pressurization process during the vacuum blister molding process to accelerate the molding speed. In this embodiment, the gas pressurization process includes using high-pressure gas with 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. The crystallinity of the crystallized polyester sheet is, for example, 8.5% to 25%, so as to improve the heat resistance of the suitcase shell. After being exposed to 70℃ for 14 days, the box showed no deformation. Compared with the conventional film forming technology, most of them do not control the temperature, so no crystallization will occur, which leads to the disadvantages of texture changes 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 1 mm to 4 mm. mm, preferably 1.2 mm to 3.5 mm. In this way, the shell texture can be well formed and have excellent impact resistance, with an impact strength greater than 30 kg-cm/cm.

In this embodiment, the polyester sheet is made of an impact-resistant polyester composition. The impact-resistant polyester composition may include PET resin, impact-resistant modifier, compatibilizer, antioxidant and lubricant. 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-resistant modifier is, for example, 5 wt% to 15 wt%, and the content of the compatibilizer is, for example, 2 wt% to 15 wt%, the antioxidant content is, for example, 0.1 wt% to 1 wt%, and the lubricant content is, for example, 0.1 wt% to 1 wt%. The impact-resistant polyester composition made by kneading and modifying the above ingredients has the characteristics of high impact strength, high rigidity, low density and easy processing. It is suitable for use in impact-resistant extrusion and vacuum forming products, such as luggage shells.

In this embodiment, the PET resin may include virgin pellets or environmentally friendly recycled pellets, where the source of the environmentally friendly recycled pellets may include bottle recycled pellets, film material recycled pellets, fabric recycled pellets or industrial recycled environmentally friendly recycled polyester pellets (release film etc.) to meet the demand for the introduction of recycled materials, but the present invention is not limited to this. 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. The compatibilizer is, for example, 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 group consisting of phenolic antioxidants, phosphorous acid antioxidants, and hindered phenolic antioxidants. The lubricant is at least one selected from the material group consisting of silicon dioxide, stearic acid, polyethylene wax, stearates, fatty acid esters, and composite lubricants, but the present invention does not use This is the limit.

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

Hereinafter, the luggage case shell and its manufacturing method of the present invention will be described in detail through 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 produce a suitcase shell with good impact strength and heat resistance, this experimental example is specially made below.

Table 1 below lists the dosage ratio, processing conditions and physical property results of each component in Examples 1 to 5 and comparative examples. Table 1 Formula type 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 pressurization molding pressure kg/cm ² 20 20 25 20 15 without Sheet forming temperature ℃ 100 110 130 100 120 110 Molding mold temperature℃ 110 130 150 130 130 50 physical properties Molded product crystallinity 8.5% 9.2% 18.8% 14.6% 13.8% 2.8% Impact resistance 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 Dosage proportion unit: parts by weight Example 1

88% by weight of PET resin, 7% by weight of impact modifier polyolefin elastomer (POE), 4.2% by weight of compatibilizer polyolefin elastomer grafted glycidyl methacrylate (POE-g-GMA) . Antioxidants: 0.5% by weight of phosphorous acid antioxidants and 0.3% of lubricant silicon dioxide. Based on the above formula, it can be kneaded and granulated first to obtain a uniformly mixed high-impact masterbatch, and then extruded through an extrusion machine to obtain a plate for suitcase use; the above formula can also be mixed evenly and directly added to the extrusion machine to make a plate for suitcases. 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 processing temperature is 110°C. First put the plate into the oven of the molding machine and heat it to make the surface film temperature of the plate 100°C, then enter the forming area for vacuum molding, and at the same time use 20kg/ ^cm2 gas pressure to assist the molding. The setting time is 5 seconds, and then the gas pressure is released. Remove the suitcase 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 texture is complete and good. The shell has been tested for heat resistance at 70℃*14 days, and the shell has no deformation. Example 2

90% by weight of PET resin, 6% by weight of impact modifier polyolefin elastomer (POE), 3.2% by weight of compatibilizer polyolefin elastomer grafted glycidyl methacrylate (POE-g-GMA) . Antioxidants: 0.5% by weight of phosphorous acid antioxidants and 0.3% of lubricant silicon dioxide. Based on the above formula, it can be kneaded and granulated first to obtain a uniformly mixed high-impact masterbatch, and then extruded through an extrusion machine to obtain a plate for suitcase use; the above formula can also be mixed evenly and directly added to the extrusion machine to make a plate for suitcases. Using boards, this construction method is well known in the industry.

The thickness of the plate is 2.1mm, the depth of the molding pattern is 0.3mm, and the processing temperature is 130°C. First put the board into the oven of the molding machine and heat it to make the surface film temperature of the board 110°C, then enter the forming area for vacuum molding, and at the same time use 20kg/ ^cm2 gas pressure to assist the molding. The setting time is 5 seconds, and then the gas pressure is released. Remove the suitcase shell for normal pressure. Analysis of the suitcase shell shows that the crystallinity is 9.2%, the impact resistance strength is 40.1kg-cm/cm, and the embossed texture is complete and good. The shell has been tested for heat resistance at 70℃*14 days, and the shell has no deformation. Example 3

76% by weight of PET resin, 14% by weight of impact modifier polyolefin elastomer (POE), 9.2% by weight of compatibilizer polyolefin elastomer grafted glycidyl methacrylate (POE-g-GMA) . Antioxidants: 0.5% by weight of phosphorous acid antioxidants and 0.3% of lubricant silicon dioxide. Based on the above formula, it can be kneaded and granulated first to obtain a uniformly mixed high-impact masterbatch, and then extruded through an extrusion machine to obtain a plate for suitcase use; the above formula can also be mixed evenly and directly added to the extrusion machine to make a plate for suitcases. Using boards, this construction method is well known in the industry.

The sheet thickness is 2.5mm, the forming mold has a texture depth of 0.2mm, and the temperature is 150°C for processing. First put the board into the oven of the molding machine and heat it to make the surface film temperature of the board 130°C, then enter the forming area for vacuum molding, and at the same time use 25kg/ ^cm2 gas pressure to assist the molding. The setting time is 5 seconds, and then the gas pressure is released. Remove the suitcase shell for normal pressure. Analysis of the suitcase shell shows that the crystallinity is 18.8%, the impact resistance strength is 32.5kg-cm/cm, and the embossed texture is complete and good. The shell has been tested for heat resistance at 70℃*14 days, and the shell has no deformation. Example 4

86% by weight of PET resin, 8% by weight of impact modifier polyolefin elastomer (POE), 5.2% by weight of compatibilizer polyolefin elastomer grafted glycidyl methacrylate (POE-g-GMA) . Antioxidants: 0.5% by weight of phosphorous acid antioxidants and 0.3% of lubricant silicon dioxide. Based on the above formula, it can be kneaded and granulated first to obtain a uniformly mixed high-impact masterbatch, and then extruded through an extrusion machine to obtain a plate for suitcase use; the above formula can also be mixed evenly and directly added to the extrusion machine to make a plate for suitcases. Using boards, this construction method is well known in the industry.

The sheet thickness is 2.3mm, the forming mold has a texture depth of 0.1mm, and the temperature is 130°C for processing. First put the plate into the oven of the molding machine and heat it to make the surface film temperature of the plate 100°C, then enter the forming area for vacuum molding, and at the same time use 20kg/ ^cm2 gas pressure to assist the molding. The setting time is 5 seconds, and then the gas pressure is released. Remove the suitcase shell for normal pressure. Analysis of the suitcase shell shows that the crystallinity is 14.6%, the impact resistance strength is 38.2kg-cm/cm, and the embossed texture is intact and good. The shell has been tested for heat resistance at 70℃*14 days, and the shell has no deformation. Example 5

78% by weight of PET resin, 14% by weight of impact modifier polyolefin elastomer (POE), 7.2% by weight of compatibilizer polyolefin elastomer grafted glycidyl methacrylate (POE-g-GMA) . Antioxidants: 0.5% by weight of phosphorous acid antioxidants and 0.3% of lubricant silicon dioxide. Based on the above formula, it can be kneaded and granulated first to obtain a uniformly mixed high-impact masterbatch, and then extruded through an extrusion machine to obtain a plate for suitcase use; the above formula can also be mixed evenly and directly added to the extrusion machine to make a plate for suitcases. Using boards, this construction method is well known in the industry.

The thickness of the plate is 1.8mm, the depth of the molding pattern is 0.15mm, and the processing temperature is 130°C. First put the plate into the oven of the molding machine and heat it to make the surface film temperature of the plate 120°C, then enter the molding area for vacuum molding, and at the same time use 15kg/ ^cm2 gas pressure to assist the molding. The setting time is 5 seconds, and then the gas pressure is released. Remove the suitcase shell for normal pressure. Analysis of the suitcase shell shows that the crystallinity is 13.8%, the impact resistance strength is 35.1kg-cm/cm, and the embossed texture is intact and good. The shell has been tested for heat resistance at 70℃*14 days, and the shell has no deformation. Comparative example

87% by weight of PET resin, 8% by weight of impact modifier polyolefin elastomer (POE), 4.2% by weight of compatibilizer polyolefin elastomer grafted glycidyl methacrylate (POE-g-GMA) . Antioxidants: 0.5% by weight of phosphorous acid antioxidants and 0.3% of lubricant silicon dioxide. The sheet thickness is 2.1mm, the forming mold has a texture depth of 0.1mm, and the temperature is 50°C for processing. First put the plate into the oven of the molding machine and heat it to make the mold temperature on the surface of the plate 110°C, then enter the molding area for vacuum molding. The setting time is 5 seconds, and then the gas pressure is released to normal pressure and the suitcase shell is taken out. Analysis of the suitcase shell shows that the crystallinity is 2.8%, the impact resistance strength is 51kg-cm/cm, the embossing texture is poor, and some textures are not obvious, and the shell will undergo deformation after undergoing a 70℃*14-day heat resistance test.

In Examples 1 to 5, during the vacuum forming process, the surface film temperature of the sheet is 85-140°C, the mold temperature is 110°C to 160°C, and at the same time, 10 kg/cm ² to 45kg/cm ² gas pressure is used to assist the molding, so that PET can be The surface texture of the board is uniform and beautiful. And because the temperature reaches the crystallization temperature, the crystallinity reaches 8.5% to 25%, so that the prepared suitcase shell has no deformation in a high temperature environment of 70°C.

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

Crystallinity test method: Based on DSC spectrum analysis, it is calculated by the following formula: Crystallinity = [melting peak area - recrystallization peak area)/theoretical enthalpy of 100% crystallization]

Impact strength test method: ASTM256

To sum up, the present invention provides a luggage case shell and a manufacturing method thereof, which are not affected by the molding extension ratio and can make the shell texture uniform to improve the texture of the luggage case. In addition, extrusion plate making does not require an embossing wheel, which can save the cost of embossing wheels. On the other hand, the pattern of the master mold can be flexibly designed to 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 virgin pellets, environmentally friendly recycled PET can also be used. Its mechanical properties are equivalent to virgin pellets. Therefore, recycled materials can be introduced. needs. The manufactured suitcase shell not only has a well-formed shell texture, but also has excellent impact resistance and heat resistance, and is both beautiful and practical.

without

without

Claims (8)

A method for manufacturing a suitcase shell, including: subjecting a heated and softened polyester sheet to a vacuum blister molding process, so that the surface of the polyester sheet is adsorbed to the surface of a master mold, so that the surface of the polyester sheet is Texture processing process, the surface texture of the master mold is transferred to the polyester sheet to form a suitcase shell, wherein the temperature of the master mold is 110°C to 160°C, so that the polyester sheet Crystallization occurs, and the crystallinity of the polyester sheet that produces crystallization is 8.5% to 25%. The method for manufacturing a suitcase shell as claimed in claim 1 further includes performing a gas pressurization process simultaneously during the vacuum blister molding process. The manufacturing method of a suitcase shell as claimed in claim 2, wherein the gas pressurization process includes using high-pressure gas with a pressure of 15kg/cm ² to 45kg/cm ² . The manufacturing method of a suitcase shell as claimed in claim 1, wherein the polyester sheet has a heating softening temperature of 85°C to 140°C. The method for manufacturing a suitcase shell 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 manufacturing method of a suitcase shell as claimed in claim 1, wherein the thickness of the polyester sheet is 0.8mm to 4.5mm. The manufacturing method of a suitcase shell as claimed in claim 1, wherein the polyester sheet includes PET resin, the PET resin includes virgin particles or environmentally friendly recycled particles, and the relative viscosity of the PET resin is 0.60 to 1.1. A suitcase shell is made by the manufacturing method of a suitcase shell according to any one of claims 1 to 7, and the impact resistance strength of the suitcase shell is greater than 30kg-cm/cm.