Pencil, manufacturing process of pencil, and manufacturing apparatus thereof

Abstract

The present application relates to stationery preparation technical field, especially relate to a pencil, pencil manufacturing process and its manufacturing equipment, the pencil is from inside to outside in turn lead core, paper roll layer, paper layer, wood layer, wherein the paper layer is the mixture of paper particle, polyurethane adhesive and water solidification formation, the pencil manufacturing equipment is composed of lead core fixing plate, shell fixing plate, top plate, glue injection fixing plate and sealing plate, the pencil prepared by the present application has good heat expansion and cold shrinkage resistance, low cost.

Description

TECHNICAL FIELD

[0001] The present application relates to stationery manufacturing technology field, especially to a pencil, pencil manufacturing process and manufacturing equipment thereof. BACKGROUND

[0002] Common pencil can be divided into two categories according to the material, which are wooden shell and paper shell. The manufacturing process of wooden shell pencil is as follows: first, two half wooden shells are grooved, then the lead core is put into the groove, and finally the two half wooden shells are closed and bonded. The lead core of this type of pencil is directly fixed by the wooden shell, and the processing precision of the groove hole in the center of the wooden shell is relatively high. At the same time, since the thermal expansion of the wooden shell and the lead core is different, when the pencil of this type expands greatly, it is easy to come off the lead, which increases the product failure rate. The manufacturing process of paper shell pencil is as follows: the paper is tightly wrapped on the outer surface of the lead core. Since the thermal expansion of paper is smaller than that of wood, the lead core of this type of pencil is difficult to come off, and the product failure rate is low, but the corresponding manufacturing cost is also multiplied. SUMMARY

[0003] The present application provides a pencil, a pencil manufacturing process and a manufacturing equipment thereof to overcome the deficiencies in the prior art.

[0004] Technical scheme: To achieve the above-mentioned purpose, a pencil according to the present application comprises a lead core, a paper layer, a paper chip layer and a wooden layer. The paper layer is wrapped on the outside of the lead core, the wooden layer is wrapped on the outside of the paper layer, a cavity is formed between the wooden layer and the paper layer, and the paper chip layer is filled into the cavity.

[0005] A manufacturing process of a pencil comprises the following steps:

[0006] (S1) weighing lead core raw materials, mixing according to the set proportion, and sequentially passing through a kneading machine, a three-roll machine and a core pressing machine to form a lead core;

[0007] (S2) wrapping the surface of the lead core with a paper layer with a thickness of not more than 1mm;

[0008] (S3) taking a wooden layer with a hole in the middle, and inserting the lead core wrapped with the paper layer into the hole of the wooden layer;

[0009] (S4) mixing paper chip particles, polyurethane adhesive and water, and pouring the mixture into the gap between the wooden layer and the paper layer to form a paper chip layer.

[0010] (S5) standing and air drying.

[0011] Preferably, the mass ratio of the paper chip particles, the polyurethane adhesive and the water is 3:(2-1):1.

[0012] Preferably, the maximum diameter of the paper particles is less than 0.05 mm.

[0013] A pencil manufacturing device comprises

[0014] A lead fixing plate is provided with a plurality of lead fixing seats;

[0015] A shell fixing plate is provided with a plurality of shell fixing seats, the lead fixing plate is arranged above the shell fixing plate and can move up and down relative to the shell fixing plate, the lead fixing seat and the shell fixing seat correspond to each other;

[0016] A top plate is provided with a plurality of negative pressure fixing seats, the top plate is arranged above the shell fixing plate and can move up and down relative to the shell fixing plate, the negative pressure fixing seat and the shell fixing seat correspond to each other, and the negative pressure fixing seat is communicated with a negative pressure device;

[0017] A glue injection fixing plate is arranged below the lead fixing plate and can move up and down relative to the lead fixing plate, the glue injection fixing plate is provided with glue injection seats, the glue injection seats are connected with glue injection cylinders, the glue injection seats correspond to the lead fixing seats and can be connected or separated with the lead fixing seats.

[0018] Preferably, a sealing plate is arranged above the shell fixing plate, the sealing plate is provided with suction cups, and the suction cups correspond to the lead fixing seats.

[0019] Preferably, the lead fixing seat comprises a protrusion and a skirt, an outer wall of the protrusion and an inner wall of the skirt form a containing cavity for fixing the wooden shell, and a center of the protrusion is provided with a hole for fixing the lead core.

[0020] Preferably, the protrusion is provided with a through glue injection hole.

[0021] The pencil, the pencil manufacturing process and the pencil manufacturing device of the present application have at least the following technical effects:

[0022] (1) The pencil is composed of a lead core, a paper roll layer, a paper particle layer and a wooden layer, the paper roll layer can wrap the lead core to ensure that the lead core does not come off during thermal expansion and cold contraction, and the waste rate is low;

[0023] (2) The paper particle layer between the wooden layer and the paper roll layer is formed by mixing paper particles, polyurethane adhesive and water, the paper particles can be prepared from recycled waste paper, and the manufacturing cost is greatly reduced compared with the pencil with a paper shell;

[0024] (3) The wooden layer and the paper roll layer are filled by the paper particle layer, which can reduce the processing precision of the wooden layer and also help to reduce the production cost. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 A sectional view of the pencil according to the present application;

[0026] Figure 2 A structural front view of a manufacturing apparatus for the pencil;

[0027] Figure 3 A structural schematic view of a manufacturing apparatus for the pencil;

[0028] Figure 4 A structural schematic view of the lead fixing plate;

[0029] Figure 5 A structural schematic view of the lead fixing seat.

[0030] In the drawings, 101, lead; 201, paper roll layer; 301, paper chip layer; 401, wooden layer; 1, lead fixing plate; 2, lead fixing seat; 3, shell fixing plate; 4, shell fixing seat; 5, top plate; 6, negative pressure fixing seat; 7, glue injection fixing plate; 8, glue injection seat; 9, sealing plate; 10, suction cup; 11, protrusion; 12, skirt; 13, accommodating cavity; 14, hole; 15, glue injection hole. DETAILED DESCRIPTION

[0031] The following will be described in conjunction with the accompanying Figure 1 to the accompanying Figure 5 The principles and features of the present application are described, the examples are only used to explain the present application, and are not used to limit the scope of the present application.

[0032] Example One

[0033] A pencil, which comprises, from inside to outside, a lead 101, a paper roll layer 201, a paper chip layer 301, and a wooden layer 401. The paper roll layer 201 is wrapped outside the lead 101. The wooden layer 401 is wrapped outside the paper roll layer 201. A cavity is formed between the wooden layer 401 and the paper roll layer 201, and the paper chip layer 301 is filled into the cavity.

[0034] Example Two

[0035] A manufacturing process of a pencil, comprising the following steps:

[0036] (S1) The following materials are mixed according to the mass percentage, wherein the clay powder is 40 parts, the barium sulfate is 35 parts, the kaolin is 8 parts, and the adhesive is 17 parts. The lead 101 is prepared by a kneading machine, a three-roll machine, and a core pressing machine in sequence.

[0037] (S2) The surface of the lead 101 prepared in step (S1) is wrapped with a 1mm paper roll layer 201;

[0038] (S3) A wooden layer 401 with an outer surface in the shape of a hexagon is prepared, a hole is drilled in the center of the wooden layer 401, and the product obtained in step (S2) is inserted into the hole of the wooden layer 401;

[0039] (S4) The paper particles, the polyurethane adhesive and the water are mixed, and the mixture is injected into the gap between the wooden layer 401 and the paper roll layer 201 to form a paper layer 301; wherein the mass ratio of the paper particles, the polyurethane adhesive and the water is shown in Table 1;

[0040] (S5) The product obtained in step (S4) is left to dry.

[0041] In order to detect the compression strength of the produced pencil, the strength of the whole pencil is tested according to the device shown in the national standard JB / T8133.8-2013 "Test methods of physical and chemical properties of electric carbon products (Part 8: Compression strength)", the limit strength of the pencil when it is broken is tested, and the test results are shown in Table 1.

[0042] Table 1: Composition and content of the paper layer

[0043] Shredded paper particles Polyurethane adhesive Water Force (N) Product 1 3 1 1 200.15 Product 2 3 1.5 1 215.20 Product 3 3 2 1 219.01

[0044] Example 3

[0045] A pencil manufacturing device comprises a lead core fixing plate 1, a shell fixing plate 3, a top plate 5, a glue injection fixing plate 7 and a sealing plate 9, the shell fixing plate 3 is arranged above the lead core fixing plate 1, the top plate 5 is arranged above the shell fixing plate 3, and the glue injection fixing plate 7 is arranged below the lead core fixing plate 1. The lead core fixing plate 1 is arranged with a plurality of lead core fixing seats 2 in a rectangular array.

[0046] Referring to the coordinate system shown in Figure 3 The lead core fixing plate 1 can move up and down along the Z direction; the glue injection fixing plate 7 can move up and down along the Z direction; the shell fixing plate 3 can reciprocate along the Y direction and can move up and down along the Z direction; the top plate 5 can reciprocate along the Y direction and can move up and down along the Z direction; and the sealing plate 9 can reciprocate along the Y direction and can move up and down along the Z direction. Specifically, the implementation of the lead core fixing plate 1, the shell fixing plate 3, the top plate 5, the glue injection fixing plate 7 and the sealing plate 9 will not be described in detail again, and existing methods such as air cylinder or screw drive can be used.

[0047] The array of the lead core fixing plate 1 is provided with a plurality of lead core fixing seats 2. The lead core fixing seat 2 comprises an integrally formed protrusion 11 and a skirt 12, the skirt 12 is circular, and the protrusion 11 is located at the center of the skirt 12. The outer wall of the protrusion 11 and the inner wall of the skirt 12 form a containing cavity for fixing the wooden shell, and the center of the protrusion 11 is provided with a hole 14 for fixing the lead core 101. The lead core fixing seat 2 is made of silica gel. The array of the glue injection fixing plate 7 is provided with a glue injection seat 8, the glue injection seat 8 is a quick-change nozzle and is in communication with a glue injection cylinder, wherein the glue injection cylinder is used to contain a mixture of paper particles, polyurethane adhesive and water; the protrusion 11 is provided with a through glue injection hole 15, the glue injection hole 15 extends from the lower surface of the protrusion 11 to the upper surface of the protrusion 11. The glue injection fixing plate 7 drives the glue injection seat 8 to move upward, and the glue injection seat 8 is in communication with the lead core fixing seat 2.

[0048] The array of the shell fixing plate 3 is provided with a plurality of shell fixing seats 4 for fixing the wooden layer 401. The array of the sealing plate 9 is provided with a suction cup 10 for grabbing the processed pencil; the array of the top plate 5 is provided with a plurality of negative pressure fixing seats 6, the negative pressure fixing seats 6 are in communication with a negative pressure device, and the top plate 5 can drive the negative pressure fixing seats 6 to move downward so that the negative pressure fixing seats 6 are in communication with the shell fixing seats 4. The shell fixing seat 4 is made of silica gel.

[0049] The lead core fixing seat 2, the shell fixing seat 4, the negative pressure fixing seat 6, the glue injection seat 8 and the suction cup 10 are one-to-one corresponding.

[0050] The working principle of the device is as follows: (S1) one end of the lead core 101 wrapped with the paper roll layer 201 is inserted into the hole 14 of the lead core fixing seat 2, one end of the wooden layer 401 is inserted into the shell fixing seat 4, and the shell fixing plate 3 is driven to translate to make the lead core fixing plate 1 and the shell fixing plate 3 opposite to each other; (S2) the shell fixing plate 3 is driven to move downward, the other end of the wooden layer 401 is inserted into the accommodating cavity 13, the glue injection fixing plate 7 is driven upward to make the glue injection seat 8 communicate with the lead core fixing seat 2, the top plate 5 is driven downward to make the negative pressure fixing seat 6 communicate with the shell fixing seat 4, and the sealed cavity is formed between the wooden layer 401 and the paper roll layer 201 at this time; (S3) the negative pressure equipment is started, the paper particles, the polyurethane adhesive and the water enter the sealed cavity between the wooden layer 401 and the paper roll layer 201 through the glue injection seat 8 and the lead core fixing seat 2 in sequence; (S4) the negative pressure equipment is closed, and the shell fixing plate 3 is removed, the wooden layer 401 is left on the lead core fixing plate 1 together with the lead core 101; (S5) a period of time (usually 10 min) is left to make the paper particles, the polyurethane adhesive and the water solidify into the paper layer 301), the sealing plate 9 is moved to make the suction disc 10 adsorb the formed pencil, the sealing plate 9 is moved upward, the suction disc 10 slowly pulls out the formed pencil from the lead core fixing plate 1, and the mixture of the paper particles, the polyurethane adhesive and the water is continuously input into the glue injection fixing seat during the pulling-out process, so that the part of the wooden layer 401 and the paper roll layer 201 occupied by the lead core fixing seat 2 is also filled; (S5) a period of time is left again, and the finished product can be taken off from the suction disc 10.

[0051] The above only describes the preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A manufacturing apparatus of a pencil, characterized by comprising: The pencil comprises a lead core (101), a paper roll layer (201), a paper chip layer (301) and a wooden layer (401); the paper roll layer (201) is wrapped outside the lead core (101), the wooden layer (401) is wrapped outside the paper roll layer (201), a cavity is formed between the wooden layer (401) and the paper roll layer (201), and the paper chip layer (301) is filled into the cavity. The pencil manufacturing device comprises A lead core fixing plate (1) is provided with a plurality of lead core fixing seats (2) in array; An outer shell fixing plate (3) is provided with a plurality of outer shell fixing seats (4) in array, the lead core fixing plate (1) is arranged above the outer shell fixing plate (3) and can move up and down relative to the lead core fixing plate (1), and the lead core fixing seat (2) corresponds to the outer shell fixing seat (4) one by one; A top plate (5) is provided with a plurality of negative pressure fixing seats (6) in array, the top plate (5) is arranged above the outer shell fixing plate (3) and can move up and down relative to the outer shell fixing plate (3), the negative pressure fixing seat (6) corresponds to the outer shell fixing seat (4) one by one, and the negative pressure fixing seat (6) is communicated with a negative pressure device; A glue injection fixing plate (7) is arranged below the lead core fixing plate (1) and can move up and down relative to the lead core fixing plate (1), the glue injection fixing plate (7) is provided with glue injection seats (8) in array, the glue injection seat (8) is connected with a glue injection cylinder, the glue injection seat (8) corresponds to the lead core fixing seat (2) one by one and can be connected with or separated from the lead core fixing seat (2); The lead core fixing seat (2) comprises an integrally formed protrusion (11) and a skirt (12), an outer wall of the protrusion (11) and an inner wall of the skirt (12) form a containing cavity (13) for fixing a wooden outer shell, and the protrusion (11) is provided with a through glue injection hole (15).

2. The manufacturing apparatus for a pencil according to claim 1, wherein An enclosing plate (9) is arranged above the outer shell fixing plate (3), the enclosing plate (9) is provided with suction discs (10) in array, and the suction disc (10) corresponds to the lead core fixing seat (2) one by one.

3. The manufacturing apparatus for a pencil according to claim 1, wherein A hole (14) for fixing the lead core (101) is arranged at the center of the protrusion (11).

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